EP3899280A1 - Zahnradfluidmaschine - Google Patents
ZahnradfluidmaschineInfo
- Publication number
- EP3899280A1 EP3899280A1 EP19832039.2A EP19832039A EP3899280A1 EP 3899280 A1 EP3899280 A1 EP 3899280A1 EP 19832039 A EP19832039 A EP 19832039A EP 3899280 A1 EP3899280 A1 EP 3899280A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- bearing
- ring
- fluid machine
- internal gear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/086—Carter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/04—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for reversible machines or pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0007—Radial sealings for working fluid
- F04C15/0019—Radial sealing elements specially adapted for intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/50—Bearings
Definitions
- the invention relates to an internal gear fluid machine, with a housing, a in the Ge housing rotatably mounted around a ring gear axis of rotation and a ring gear rotatably mounted in the ring gear about a parallel to the ring gear axis of rotation offset pinion, viewed in cross section on the one hand an internal toothing of the ring gear in a housing-fixed
- a grip area sealingly engages with an external toothing of the pinion to form a first sealing point and, on the other hand, to form a second sealing point, at least one tooth tip of the internal toothing lies sealingly against a tooth tip of the external toothing, or both the tooth tip of the internal toothing and the tooth tip of the external toothing on opposite sides on a filler piece, the first sealing point and the second sealing point on the one hand being cut between the internal toothing and the external toothing, the pressure chord a first fluid space and on the other hand the pressure chord a second fluid draum is present, and the ring gear is rotatably mounted in
- the publication 101 09 770 A1 is known from the prior art.
- This describes a fill-less internal gear pump with a housing, a bearing ring movable in a bore of the housing, but rotatably received in a non-rotatable manner, a circumferentially mounted internal toothed ring gear in the bearing ring and a rotatably mounted in the housing, meshing with the ring gear, the pinion of which Define teeth by a full engagement in tooth gaps of the ring gear on the one hand, and a sealing contact with the tooth heads of the ring gear in an engagement-free ring gear region approximately diametrically opposite the tooth gap engagement on the other hand, a suction chamber and a pressure chamber in the toothings.
- the bearing ring is pivotable relative to the bore about a pivot axis parallel to its axis by a spring loading the bearing ring in such a way that the sealing contact between the tooth ends of the pinion and ring gear is maintained.
- the load on the bearing ring Tende spring is a bar spring which passes through a bore running in the bearing ring approximately in its axial direction and is supported at least at one end in a housing bore.
- the internal gear fluid machine is a fluid delivery device and is used to deliver a fluid, for example a liquid or a gas.
- the internal gear fluid machine has two gearwheels, namely the ring gear and the pinion.
- the pinion has the external toothing and the ring gear has the internal toothing.
- the external toothing and the internal toothing seen in the circumferential direction, engage with one another in regions, that is, mesh with one another in regions.
- the pinion and the ring gear are provided for fluid conveying and are designed for this reason in such a way that when the ring gear or the pinion rotates, they interact to convey the fluid and engage or mesh with one another.
- the pinion is preferably coupled to an input shaft or drive shaft of the internal gear fluid machine, preferably rigid and / or permanent.
- the pinion is rotatably mounted in the housing of the internal gear fluid machine by means of the input shaft.
- the pinion is preferably arranged on the input shaft so that it always has the same speed as the input shaft during operation of the internal gear fluid machine.
- Both the ring gear and the pinion are arranged in the housing and rotatably mounted in the housing.
- the ring gear is rotatably mounted about the ring gear axis of rotation, whereas the pinion is rotatably mounted about the pinion rotation axis. Seen in cross section, i.e.
- the pinion is arranged in the ring gear, namely in such a way that the internal toothing of the ring gear meshes in the engagement area with the internal toothing of the pinion or engages with it stands. This means that a rotational movement of the pinion is transmitted directly to the ring gear and vice versa, a rotational movement of the ring gear is transmitted directly to the pinion.
- the engagement area is fixed to the housing, so it does not rotate with the ring gear or the pinion.
- a tooth of one of the toothings engages in a tooth space between the other of the toothings.
- the space between the teeth is limited in the circumferential direction by teeth of the respective toothing.
- a tooth of the internal toothing engages in an interdental space of the external toothing or, conversely, a tooth of the external toothing engages in an interdental space of the internal toothing.
- the internal toothing and the external toothing act in a sealing manner to the extent that the first sealing point is formed.
- the first sealing point is to be seen in cross section as a sealing point.
- the first sealing point is preferably present over at least part of the axial extent of the ring gear and / or the pinion, in particular over the entire extent, so that it is designed as a sealing line.
- the engagement area ie preferably on the diametrically opposite side of the engagement area with respect to the ring gear rotation axis and / or the pinion rotation axis, is the second sealing point, which is formed by the sealing contact of the tooth head of the internal toothing on the tooth head of the external toothing.
- the second sealing point is also seen as a sealing point in cross section, but overall is preferably configured as a sealing line.
- the sealing contact of the tooth head of the internal toothing with the tooth head of the external toothing is to be understood to mean that a tip circle of the internal toothing corresponds exactly or at least approximately to a tip circle of the external toothing, so that at the second sealing point the internal toothing and the external toothing cooperate in a sealing manner without engagement, that is to say without at the second sealing point a tooth of one of the toothings engages in a tooth space between the other of the toothings.
- the first sealing point and the second sealing point define the pressure line which intersects both the first sealing point and the second sealing point. It can be seen that the first sealing point and the second sealing point lie diametrically opposite one another, so that the pressure chord runs through the ring gear axis of rotation and / or the pinion axis of rotation. The tendon can thus duri fen through the ring gear axis of rotation, the pinion axis of rotation or both. Alternatively, it can be provided that the pressure chord extends at a distance from the ring gear rotation axis, the pinion rotation axis or both. For example, the tendon runs through the ring gear axis of rotation, but not through the pinion axis of rotation, or vice versa.
- the ring gear and the pinion together enclose two fluid spaces, namely the first fluid space and the second fluid space. Both fluid spaces are in each case in the radial direction inwards by the pinion or the external toothing of the pinion and in the radial direction to the outside by the ring gear or the internal toothing of the ring gear be limited. Seen in cross section, the first fluid space on the one hand is the tendon and the second fluid space on the other hand is the tendon. Depending on a direction of rotation of the internal gear fluid machine, one of the fluid spaces serves as a suction chamber and the other of the fluid spaces serves as a pressure chamber.
- the internal gear fluid machine is designed, for example, without a filler. This means that at the second sealing point the internal toothing lies directly against the external toothing. There is therefore no filler piece on which the internal toothing, on the one hand, or the external toothing, on the other hand, lies sealingly. Rather, the sealing contact is brought about both in the first sealing point and in the second sealing point solely by the interaction of the internal toothing with the external toothing.
- the internal gear fluid machine can also have a filler piece, in particular a crescent-shaped filler piece, which is arranged between the inner toothing and the outer toothing, so that the internal toothing, on the one hand, and the outer toothing, on the other hand, bear sealingly against the filler.
- the internal teeth lie in the radial direction on the outside and the external teeth in the radial direction on the inside of the filler.
- the ring gear is rotatably mounted in the compensation ring and the compensation ring is in turn arranged with play in the housing, namely in the compensation ring receptacle formed in the housing.
- the storage of the ring gear in the compensation ring can, for example, take place immediately, so that the hollow wheel slides with its outer circumference on an inner circumference of the compensation ring.
- the ring gear can of course be mounted on the compensation ring via a slide ring or a bearing bush.
- the compensation ring is always arranged with clearance in the radial direction in the compensation ring.
- the compensation ring can move freely in the compensation ring holder.
- the game is limited using the support facilities.
- the support devices are spaced apart from one another in the circumferential direction and are preferably configured identically before.
- the support devices are designed in this way, for example. Tet that they allow a pivoting movement of the compensation ring within the compensation ring receptacle. They limit the play in the radial direction, within which the compensation ring is displaceable in the radial direction within the compensation ring holder. Fixing the compensation ring in the circumferential direction is not provided by means of the bearing devices. In this respect, the bearing devices allow the compensation ring to be displaced in the circumferential direction.
- the compensation ring By pivoting the compensation ring can be arranged in different pivot positions.
- different of the bearing devices should form the tilting bearing, by means of which the compensation ring can be tilted with respect to the housing about the tilting axis.
- one of the support devices forms the leg bearing.
- the at least one other of the support devices should at the same time release this tilting about the tilt axis.
- the support devices comprise a first support device and a second support device. In a first of the pivot positions, the first bearing device now forms the tilt bearing, whereas the second bearing device releases the compensation ring within the compensation ring with the clearance, so that the tilting of the compensation ring about the tilt axis formed by the tilt bearing is permitted.
- the second support device forms the tilting bearing, whereas the first Auflagerein device releases the compensation ring with play for tilting.
- the support devices do not completely release the compensation ring in any of the swivel positions, but only the play is realized which enables the tilting about the tilt axis.
- the current swivel position of the compensation ring is preferably established on the basis of a direction of rotation of the internal gear fluid machine or the ring gear and / or the pinion.
- the internal gear fluid machine is designed in such a way that in a first direction of rotation the compensation ring automatically pivots into the first pivot position, whereas it pivots into the second pivot position if there is a second direction of rotation which is opposite to the first direction of rotation.
- the tilting bearing or the arrangement of the tilting bearing is also adjusted according to the respective direction of rotation or adapted to it, so that the tilting of the compensation ring takes place about a tilting axis dependent on the direction of rotation of the internal gear fluid machine.
- the compensation ring is not pivoted before or takes place in order to change the tilting axes.
- the support devices each form one of the plurality of tilt axes, which are present simultaneously in at least one tilt position of the compensation ring, which can also be referred to as the starting position.
- the compensation ring In the initial position, the compensation ring is articulated on the housing via the several tilting axes.
- the support devices are designed such that they allow the compensation ring to tilt about one of the tilt axes.
- the compensation ring is tilted out of the starting position, one of the support devices continues to form the corresponding tilt axis, whereas the at least another of the support devices comes out of contact, so that the corresponding tilt axis is no longer present.
- a tilt position of the compensation ring that differs from the starting position, only one tilt axis is present.
- contact pressure is achieved between the internal teeth and the external teeth at the second sealing point.
- the contact pressure is dependent on a delivery pressure of the internal gear fluid machine and / or a speed of the internal gear fluid machine.
- the contact pressure is preferably greater, the higher the delivery pressure and / or the speed. In this way, an excellent seal between the first fluid space and the second fluid space is always achieved.
- the compensation ring is fixed in the circumferential direction by means of the anti-rotation device, for example completely or alternatively fixed with play.
- the anti-rotation lock prevents rotation of the compensation ring.
- the compensation ring can be spring-loaded by means of a spring arrangement or a spring element.
- the spring arrangement causes a spring force on the compensation ring, which is aligned such that the internal toothing at the second sealing point is pressed against the external toothing.
- the Federan arrangement urges the internal teeth regardless of an operation of the internal gear fluid machine or a speed of the internal gear fluid machine to the external teeth. Accordingly, an adequate seal is ensured even when the internal gear fluid machine is at a standstill or at low speeds, so that in particular re starting the internal gear fluid machine is improved.
- the spring arrangement is preloaded in such a way that it always brings about a contact pressure between the internal toothing and the external toothing at the second sealing point.
- the spring arrangement is designed such that it fixes the compensation ring in the circumferential direction, in particular precisely fixes it or fixes it with play.
- the described configuration of the internal gear fluid machine has the advantage that it has identical or at least almost identical conveying properties in opposite directions of rotation because the compensation ring adjusts itself to the respective direction of rotation.
- the internal gear fluid machine can be used for applications in which there are alternating different directions of rotation.
- a hydraulic pump for a double-acting hydraulic cylinder may be mentioned as an example of such an application.
- a piston which is arranged in the hydraulic cylinder is usually moved from a rest position to a position different from the rest position and then again from the position to the rest position.
- the hydraulic pump i.e. the internal gear fluid machine described, is operated with a first direction of rotation and for shifting from the position to the rest position with a second direction of rotation opposite to the first direction of rotation.
- a further embodiment of the invention provides that the first sealing point and the second sealing point for a rotational angle position for the ring gear and pinion are present, in which, in the circumferential direction, a tooth of the internal toothing is arranged in contact with a tooth of the external toothing.
- the two sealing points are determined for a specific arrangement of the ring gear and pinion with respect to one another, namely when there is contact or an overlap of the teeth.
- a further embodiment of the invention provides that a straight line which is perpendicular to the pressure chord and runs between the ring gear axis of rotation and the pinion axis of rotation extends at a distance from the respective tilting axis, so that during operation the internal gear fluid machine due to in the first fluid space and the second fluid space present Fluid pressure acts on the compensation ring via the ring gear, which causes a torque about the tilt axis.
- the pressure chord is defined by the two sealing points and runs through them in cross section.
- the straight line which also runs between the ring gear axis of rotation and the knurled axis of rotation, is perpendicular to the tendon.
- the straight line preferably intersects the pressure chord in a center point of the pressure chord between the first sealing point and the second sealing point. This straight line corresponds to a course of a force occurring during operation of the internal gear fluid machine, which is caused by different fluid pressures occurring in the fluid spaces.
- one of the fluid spaces serves as a suction chamber and the other of the fluid spaces serves as a pressure chamber.
- the higher pressure in the pressure chamber forces the ring gear with respect to the pinion in the direction of the straight line described.
- the internal gear fluid machine is designed such that this straight line runs at a distance from the respective tilt axis, in particular for all possible positions between the hollow wheel axis of rotation and the pinion axis of rotation.
- the compressive force acts on the torque acting on the compensation ring around the tilt axis.
- This torque is designed such that it urges the internal toothing of the ring gear in the direction of the external toothing of the pinion, namely in the region of the second sealing point.
- the tilt axis formed by the support devices changes its position depending on the direction of rotation. This can take place, for example, because the compensation ring can be displaced into the different pivoting positions or tilting positions due to the corresponding design of the support devices. Accordingly, different tilt axes are realized for different directions of rotation, so that the appropriate tilt axis is selected for each direction of rotation of the internal gear fluid machine and is used to generate the torque. As a result, an excellent seal is achieved for each direction of rotation of the internal gear fluid machine.
- the internal gear fluid machine can be operated either with a first direction of rotation or with a second direction of rotation opposite to the first direction of rotation, for example despite a possible fill-less configuration. Particularly preferably, the internal gear fluid machine can alternate with the first direction of rotation.
- an internal gear fluid machine can also be realized, in which the pivoting is not realized, but in which only the tilting about one of the tilting axes takes place.
- the torque pushes the tooth tip of the internal toothing at the second sealing point in the direction of the tooth tip of the external toothing.
- the sealing effect described is achieved, which is greater, the higher the fluid pressure in the respective pressure chamber or the greater the difference between the fluid pressure in the pressure chamber and the fluid pressure in the suction chamber.
- the internal toothing is urged directly to the external toothing.
- the internal toothing is urged to the filler.
- the filler is preferably mounted with play in the housing, so that the filler is pushed through the internal toothing in the direction of the external toothing, in particular to the external toothing.
- a further embodiment of the invention provides that a swivel range encompassing the different swivel positions is limited on the one hand by a first of the support devices and on the other hand by a second of the support devices.
- the support devices form end stops that limit the swivel range. For example, a pivoting movement of the compensation ring from the direction of the second pivoting position beyond the first pivoting position is prevented by the first bearing device and a pivoting movement from the direction of the first pivoting position beyond the second pivoting position is prevented by the second bearing device, the respective bearing device also in this case Training tipping bearings.
- the support devices are preferably designed and / or arranged such that the swivel range is at most 10 °, at most 7.5 °, at most 5 ° or at most 2.5 °.
- the swivel range preferably comprises at least 1 °, at least 2 °, at least 2.5 °, at least 3 °, at least 4 ° or at least 5 °.
- the swiveling range is particularly preferably symmetrical with respect to a straight line which perpendicularly intersects both the ring gear axis of rotation and the pinion axis of rotation.
- the described configuration of the internal gear fluid machine advantageously enables operation with different directions of rotation.
- a preferred embodiment of the invention provides that the tilting axes formed by the support devices are arranged on the same side of a plane which accommodates the pinion rotation axis.
- the pinion rotation axis lies in the plane. It is preferably also provided that the plane is perpendicular to an imaginary straight line which intersects both the ring gear axis of rotation and the pinion axis of rotation in each case vertically.
- the support devices or the tilting axes formed by them are arranged symmetrically with respect to the plane. In particular, two of the support devices are arranged at the same distance from the plane.
- the tilting axes in such a way that they lie outside the pivoting range, so that the straight line perpendicular to the pressure chord does not pass through one of the tilting axes in any of the pivoting positions, but rather is always at a distance from them.
- the straight line should therefore lie in all swivel positions on the same side of the tilt axes. This ensures a reliable reversal of the direction of rotation of the internal gear fluid machine.
- a preferred further embodiment of the invention provides that the play is at most 0.01, at most 0.02, at most 0.03, at most 0.04 or at most 0.05, based on a module of the internal teeth and / or the external teeth.
- the game divided by the module corresponds to at most one of the stated values.
- the game with which the other of the support devices releases the compensation ring for tilting about the tilt axis preferably has one of the values mentioned with respect to the module, that is to say divided by the module. With conventional sizes of the internal gear fluid machine, these enable reliable tilting about the tilt axis.
- the small play also prevents a bearing projection from striking too hard against a bearing point of the support devices when the direction of rotation changes rapidly, so that excessive wear of the support devices is prevented.
- the rotation has at least one spring element which engages at least on one side of the compensation ring on the housing and is mounted with play on the compensation ring, the spring element acting on the compensation ring in such a way that the internal toothing acts on the second sealing point is pushed onto the external toothing or onto the filler.
- the Fe derelement causes the spring force on the compensation ring. To do this, it uses at least one tig on the housing and is so far attached to it.
- the spring element particularly preferably engages on both sides of the compensation ring on the housing in order to reliably prevent the spring element from tilting in the housing.
- the spring element is preferably attached to the housing without play. However, it preferably engages with play on the compensation ring.
- the game is chosen such that the spring element allows the compensation ring to tilt about the tilt axis and / or the pivoting about the pivot axis, but at the same time causes the spring force on the compensation ring which causes the internal toothing at the second sealing point to the external toothing or at least in Urges in the direction of the external teeth.
- the spring element is mounted in a recess of the compensation ring, the recess being preferably larger in cross-section than the spring element or the region of the spring element arranged in the recess, so that the game is finally realized.
- the recess extends completely through the compensation ring in the axial direction.
- the recess can be present as an edge-closed or alternatively as an edge-open recess.
- the edge-closed recess is to be understood to mean that, viewed in cross section, it is delimited by a continuous edge. If, on the other hand, the recess is open at the edge, the edge is interrupted at least at one point, in particular in the radial direction to the outside.
- the recess is made as a simple groove in an outer circumference of the compensation ring.
- the recess is made by drilling.
- a configuration of the compensation ring can be provided by sintering, the recess being formed as well.
- a preferred further embodiment of the invention provides that the spring arrangement is designed in such a way that it only permits the pivoting movement of the compensation ring within a pivoting range comprising the several pivoting positions.
- the spring arrangement limits the swivel range on both sides and prevents the swivel range from leaving the compensation ring.
- the spring arrangement thus serves to keep the compensation ring within the pivoting range - if there is one or the pivoting is provided - and thus to ensure reliable operation in the geared fluid machine.
- a preferred further embodiment of the invention provides that the bearing devices each have a bearing protrusion and a bearing point, the bearing protrusions on the compensation ring or the housing and the bearings on each other are formed.
- the bearing projection and the bearing point work together to form the respective tilting bearing.
- all bearing projections are formed on the compensation ring and all bearing points on the housing.
- it can also be provided to design the bearing points on the housing and the bearing projections on the compensation ring.
- the configuration described is particularly simple to implement.
- the bearing projections each have a flat or curved bearing surface which bears in at least one position of the compensation ring on the corresponding bearing point for forming the tilting bearing.
- this is preferably planar seen in cross section, that is to say has a certain extent in the circumferential direction.
- the curved bearing surface preferably extends just in the circumferential direction.
- the curvature of the curved bearing surface is preferably constant.
- the bearing surface is arranged or formed on the side of the bearing projections facing the respective bearing point.
- the storage area lies against the bearing point.
- the bearing surface is arranged at least outside the starting position, spaced from the bearing point.
- the respective bearing surface for forming the respective tilting bearing can bear against the corresponding bearing point for several or all of the Auflagerein directions. This results in a particularly reliable mounting of the compensation ring.
- the design of the tilting bearing depends on the respective direction of rotation of the internal gear fluid machine. In a first direction of rotation, a first of the support devices forms the tilting bearing, in a second direction of rotation that differs from the first direction of rotation, a second device of the support devices that is different from the first support device.
- a preferred development of the invention provides that the bearing point is formed flat by a flattening.
- the flattening is present, for example, on an outer circumference of the compensation ring or on an inner circumference of the housing that limits the compensation ring receptacle in the radial direction to the outside. Viewed in cross section, the flattening has a certain extent in the circumferential direction. Apart from the flattening, the outer circumference of the compensation ring or the inner circumference of the housing is usually curved.
- the flattening represents an easy-to-manufacture design of the bearing position.
- Another preferred embodiment of the invention provides that the bearing surface rests on the bearing point via a surface contact or a line contact.
- the bearing surface and the bearing point are preferably adapted in shape, that is to say, for example, both are flat or both are curved, preferably having the same or at least a similar curvature.
- a particularly reliable support of the compensation ring on the housing is realized via the surface contact, so that the internal gear fluid machine is also designed for high fluid pressures.
- the bearing surface can rest against the bearing point via the line contact.
- the line contact is in particular realized for such internal gear fluid machines, which should be inexpensive to manufacture and only have to withstand a low fluid pressure.
- bearing projections are formed in one piece and / or with the same material as the compensation ring or the housing.
- Such a design of the bearing projections is particularly inexpensive and easy to implement.
- the bearing projections can of course be present separately from the compensation ring or the housing and subsequently attached to them. In such a configuration, they can of course also be made of the same material with the compensation ring or the housing, but preferably they are made of a different material.
- At least one axial disc bearing in the axial direction on the ring gear and / or the pinion is arranged in the housing, in which at least one passage opening is formed which is in fluid communication with one of the fluid spaces.
- the axial disk serves for axial compensation of the internal gear fluid machine.
- the thrust washer is movable in the axial direction with play between a housing wall and the ring gear or the pinion.
- the axial disk has at least one passage opening, for example exactly one passage opening. Of course, several passage openings can also be formed in the axial disk. If there are several through openings, a first one of the through openings is in fluid communication with the first fluid space, for example, and a second one of the through openings is in fluid communication with the second fluid space.
- a side of the axial disk facing away from the respective fluid space is fluidly connected to the respective fluid space.
- a sealing effect is achieved with the help of the axial disk.
- the use of the axial washer achieves a particularly high efficiency of the internal gear fluid machine.
- a plurality of axial disks are arranged in the housing, namely one on opposite sides of the ring gear or the pinion in the axial direction.
- the axial disk covers at least one pressure field formed in the housing.
- the pressure field is, for example, in the form of a depression, in particular a depression closed at the edge, in the housing or the housing wall and is completely covered by the axial disk.
- a fluid pressure is applied to the pressure field during operation of the internal gear fluid machine, for example via the passage opening already described.
- the fluid pressure present in the pressure field forces the axial disk in the direction of the ring gear or the pinion. In this way, a reliable seal of the internal gear fluid machine or an axial compensation is achieved.
- a further embodiment of the invention provides that the pressure field has a plurality of partial pressure fields which are formed at a distance from one another in the circumferential direction.
- a first of the partial pressure fields is in fluid communication with the first fluid space via the first passage opening and a second of the partial pressure fields is in fluid communication with the second fluid space via the second passage opening.
- the internal gear fluid machine is designed to be independent of the direction of rotation, so that an excellent sealing effect is achieved with the help of the axial disc, regardless of the direction of rotation.
- the distance between the partial pressure fields in the circumferential direction is selected in particular such that the partial pressure fields lie outside the swivel range.
- a further development of the invention provides that the distance between the partial pressure fields in the circumferential direction corresponds at least to the module of the internal toothing and / or the external toothing.
- the smallest distance between the partial pressure fields, viewed in the circumferential direction, is preferably at least as large as the module of the respective toothing or is greater by a factor of at least 1.25, at least 1.5, at least 1.75 or at least 2.
- a particularly high compressive strength of the internal gear fluid machine is hereby achieved.
- a further preferred embodiment of the invention provides that at least one intermediate pressure assigned to the pressure field is seen in the circumferential direction between the partial pressure fields.
- Field is formed that is fluidically connected to the several partial pressure fields.
- the intermediate pressure field is preferably present in the region of the second sealing point, in particular it overlaps when viewed in cross section.
- the intermediate pressure field is arranged in the circumferential direction at a distance from both partial pressure fields.
- the partial pressure fields are each separated from the intermediate pressure field by a web.
- the intermediate pressure field has dimensions in the circumferential direction which correspond to the module of the internal toothing and / or the external toothing or are larger than this.
- the intermediate pressure field is fluidically connected to the several partial pressure fields.
- there is a permanent flow connection between the intermediate pressure field and each of the partial pressure fields in particular via a throttle.
- a check valve is arranged between the intermediate pressure field and each of the partial pressure fields, which allow an overflow of fluid from the partial pressure fields in the direction of the intermediate pressure field, but prevent a flow from the intermediate pressure field in the direction of the partial pressure fields. In this way, a particularly high efficiency of the internal gear fluid machine is achieved.
- a further pressure field is formed in the housing on the side of the ring gear and / or the pinion opposite the pressure field in the axial direction, the pressure field and the further pressure field being spaced apart from one another in the circumferential direction are arranged or only partially overlap.
- the pressure field is in flow connection with the first fluid space and the further pressure field is in flow connection with the second pressure space, preferably in each case via a corresponding passage opening in an axial disk.
- FIG. 1 shows a schematic longitudinal section through a filler-less internal gear fluid machine
- FIG. 2 shows a schematic cross-sectional representation through the internal gear fluid machine
- FIG. 3 shows a schematic detail sectional view through a region of the internal gear fluid machine, a support device being shown in a first embodiment
- FIG. 4 shows a schematic sectional illustration of the support device in a second embodiment
- FIG. 5 shows a schematic sectional illustration of the support device in a third embodiment
- FIG. 6 shows a schematic sectional illustration of the support device in a fourth embodiment
- FIG. 7 shows a schematic sectional illustration of the support device in a fifth embodiment
- FIG. 8 shows a schematic illustration of a pressure field formed in a housing of the internal gear fluid machine in a first embodiment
- FIG. 9 shows a schematic illustration of the pressure field in a second embodiment
- Figure 10 is a schematic representation of the pressure field in a third embodiment, such as
- Figure 11 is a schematic cross-sectional view through the internal gear fluid machine in a further embodiment.
- FIG. 1 shows a schematic longitudinal sectional view of an internal gear fluid machine 1 which has a housing 2 in which a ring gear 3 and a pinion 4 are rotatably mounted.
- the ring gear 3 is about a ring gear axis of rotation 5 (not visible here) and the pinion 4 around one
- Pinion rotation axis 6 rotatably mounted.
- the ring gear axis of rotation 5 and the pinion axis of rotation 6 are arranged at a distance from one another in parallel, so that the ring gear 3 and the pinion 4 are therefore have different axes of rotation.
- the ring gear 3 has an internal toothing 7 and the pinion 4 has an external toothing 8 which mesh with one another in an engagement region 9, that is to say they engage with one another. As a result, there is a first sealing point 10 in the engagement region 9, seen in cross section.
- a second sealing point 11 lies approximately diametrically opposite the first sealing point 10, the internal toothing 7 and the external toothing 8 being completely disengaged at the second sealing point 11. Rather, the sealing effect at the second sealing point 11 is achieved by a tooth head 12 of the internal toothing 7 resting against a tooth head 13 of the external toothing 8.
- the first sealing point 10 and the second sealing point 11 together define a pressure chord 14 (not shown here), which passes through both sealing points 10 and 11.
- An imaginary straight line 15 stands vertically on the pressure chord 14, which is also arranged centrally between the sealing points 10 and 11 and thus in particular runs between the ring gear axis of rotation 5 and the pinion axis of rotation 6.
- the point at which the straight line 15 cuts the pressure chord 14 preferably swings back and forth, in particular between the axes of rotation 5 and 6.
- FIG. 2 shows a schematic cross-sectional illustration of the internal gear fluid machine 1.
- the straight line 15 corresponds to the alignment of a compressive force which acts on the ring gear 3 during operation of the internal gear fluid machine 1.
- the pressure force arises from different pressures in a first fluid space 16 and a second fluid space 17.
- the two fluid spaces 16 and 17 are on opposite sides of the pressure line 14 and are fluidically separated from one another by the sealing points 10 and 11.
- One of the fluid spaces 16 and 17, in the embodiment shown here the first fluid space 16 serves as a pressure chamber.
- the respective other fluid space 16 or 17, in the exemplary embodiment shown here, the second fluid space 17, however, serves as a suction chamber.
- the ring gear 3 and the pinion 4 convey fluid from the suction chamber into the pressure chamber.
- the supply of the fluid in the suction chamber and the discharge of the fluid from the pressure chamber is preferably carried out in the axial direction.
- the ring gear 3 in the exemplary embodiment shown here is rotatably mounted in a compensation ring 18, for example by means of a bearing bush 19, which is each optional.
- the compensation ring 18 is arranged in a compensation ring receptacle 20 of the housing 2, namely with play in the radial direction.
- the compensation ring 18 is held in the housing 2 by means of a plurality of support devices 21.
- Each of the Auflagereinrich lines 21 has a bearing projection 22 and a bearing 23.
- the compensation ring 18 is in a first tilting position, which is for a first direction of rotation of the internal gear fluid machine 1, in which the bearing projection 22 of the right-hand bearing device 21 bears against the corresponding bearing point 23.
- the right support device 21 forms a tilting bearing for tilting the compensation ring 18 with respect to the housing 2 about a tilting axis.
- the bearing projection 22 of the right support device 21, however, is spaced from the corresponding bearing 23, so that the left support device 21 releases the compensation ring 18 with a certain play for tilting about the tilt axis.
- the first tilt position is for the direction of rotation of the ring gear 3 and the pinion 4 indicated by the arrow 24. If, on the other hand, there is a direction of rotation opposite to this direction of rotation, the compensation ring 18 is automatically pivoted into a second tilting position different from the first tilting position, in which the left support device 21 now forms the tilting bearing and the right support device 21 the compensation ring 18 for tilting around Releases tilt axis.
- the pivoting of the compensation ring 18 between the pivot positions is preferably carried out by the pressure force which causes the rotary movement of the ring gear 3 and the pinion 4. In a starting position it can be provided that for both support devices 21 the bearing protrusion 22 rests against the respective bearing point 23, so that each of the support devices 21 realizes its respective tilt axis.
- the compensation ring 18 is continuously in the tilt position corresponding to the respective direction of rotation.
- one of the support devices 21 forms the tilt axis, whereas the other of the support devices 21 permits tilting about the tilt axis.
- the straight line 15 is arranged in such a way that it extends at a distance from the tilting axes of the support devices 21. Accordingly, the pressure force causes a torque about the respective tilt axis.
- the internal gear fluid machine 1 in the embodiment shown here has an anti-rotation device 25 which fixes the compensation ring 18 in the circumferential direction.
- the anti-rotation device 25 is designed in such a way that it applies spring force to the compensation ring 18 in such a way that the internal toothing 7 at the second sealing point 11 is pressed against the external toothing 8.
- the anti-rotation device 25 has a spring element 26 which engages on the housing 2 at least on one side, for example on both sides in the embodiment shown here.
- the spring element 26 is mounted with play on the compensation ring 18 Kom.
- the recess 27 passes through a recess 27 of the compensation ring 18, which is at least partially larger than the spring element 26, so that there is play between the spring element 26 and the compensation ring 18.
- the recess 27 is designed to be border-closed.
- an open-edged design of the recess 27 can be implemented.
- the spring element 26 is preferably in the form of a leaf spring.
- FIG. 3 shows a schematic cross-sectional illustration through the internal gear fluid machine 1, one of the support devices 21 being shown in a first embodiment.
- the bearing projection 22 has a curved bearing surface 28 which, in at least one of the tilting positions, lies flat against the bearing point 23.
- the bearing surface 28 has a curvature which is in the same direction as a curvature of the bearing 23, so that in the end the planar contact is realized precisely or at least approximately.
- the curvatures can correspond to each other. However, it can also be provided that the curvature of the bearing point 23 is different from the curvature of the bearing surface 28, in particular is greater than the curvature of the bearing surface 28.
- FIG. 4 shows a schematic cross-sectional illustration of the internal gear fluid machine 1, the support device 21 being shown in a second embodiment.
- the difference from the first embodiment lies in the fact that the bearing surface 28 is curved, but in the opposite direction to the bearing point 23.
- FIG. 5 shows a schematic cross-sectional illustration of the internal gear fluid machine 1, the support device 21 being shown in a third embodiment.
- the third exit leadership form corresponds almost to the second embodiment, so that reference is made to the corresponding statements.
- the difference lies in the fact that the bearing projection 22 is formed in one piece and with the same material as the housing 2.
- FIG. 6 shows a schematic cross-sectional illustration of the internal gear fluid machine 1, the support device 21 being shown in a fourth embodiment.
- the difference from the third embodiment lies in the fact that, again analogously to the first embodiment, a surface contact is realized in particular exactly or at least approximately, in which the bearing surface 28 has a curvature that is in the same direction as a curvature of the bearing point 23.
- the curvature of the bearing surface 28 is preferably different from the curvature of the bearing point 23, in particular somewhat less than the curvature of the bearing point 23, in order to realize play or tilting around a line.
- the line contact on this line can be converted into a surface contact by Hertzian pressure.
- FIG. 7 shows a further schematic cross-sectional illustration of the internal gear fluid machine 1, the support device 21 being shown in a fifth embodiment. It can be seen that both the bearing surface 28 and the bearing point 23 are formed flat by a flattening. In the case of the bearing point 23, the flattening is formed on an outer circumference of the compensation ring 18. The bearing surface 28, however, is designed flat on the Lagervor jump 22. With such a configuration, surface contact between the bearing surface 28 and the bearing point 23 is achieved in a particularly simple manner.
- FIG. 8 shows a schematic representation of a pressure field 29 which is formed in the housing 2, namely in the axial direction adjacent to the ring gear 3 or the pinion 4.
- the pressure field 29 is covered with an axial disk 30.
- the pressure field 29 and the axial disk 30 are arranged or formed on only one side.
- the pressure field 29 is present in a first embodiment. In this it has a plurality of partial pressure fields 31 and 32, which are formed at a distance from one another in the circumferential direction.
- the partial pressure fields 31 and 32 are preferably at a smaller distance from one another in the circumferential direction at the second sealing point 11 than at the first sealing point 10.
- an inner contour 33 of the partial pressure fields 31 and 32 is of part-circular design and concentric with respect to the pinion rotation axis 6.
- An au .kontur 34 of the partial pressure fields 31 and 32 is part-circular and concentric bezüg Lich the ring gear axis of rotation 5 is formed.
- the distance between the partial pressure fields 31 and 32 in the circumferential direction preferably corresponds at least to the module of the internal toothing 7 or the external toothing 8.
- an intermediate pressure field 35 is formed in the circumferential direction between the partial pressure fields 31 and 32. This is separated in the circumferential direction by means of two webs 36 from the partial pressure fields 31 and 32.
- the intermediate pressure field 35 is connected to each of the partial pressure fields 31 and 32, in the exemplary embodiment shown here via check valves 37. These allow a flow from the partial pressure fields 31 and 32 in the direction of the intermediate pressure field 35, but prevent a flow in the opposite direction .
- check valves 37 control bores can be implemented via which the flow connections are made. The control holes work in the manner of a fluidic throttle.
- FIG. 9 shows a schematic illustration of the pressure field 29 in a second embodiment. It can be seen that the inner contour 33 and the outer contour 34 are again partially circular and concentric with respect to the ring gear axis of rotation 5 or the pinion axis of rotation 6, but only partially. In the direction of the first sealing point 10, at which the partial pressure fields 31 and 32 have their smallest distance in the circumferential direction from one another, the inner contour 33 and / or the outer contour 34 deviate from the pitch circle in such a way that the respective partial pressure fields 31 and 32 are widened , which becomes larger in the direction of the respective other partial pressure field 31 or 33. As a result, sufficient axial compensation is achieved by means of the respective axial disk 30.
- FIG. 10 shows a schematic illustration of the pressure field 29 in a third embodiment.
- the pressure field 29 is not divided into partial pressure fields.
- the pressure field 29 extends in the circumferential direction, at least on the side of the second sealing point 11, beyond a center line 38 which is perpendicular to the ring gear axis of rotation 5 and the pinion axis of rotation 6.
- the pressure field 29 extends over less than 180 ° with respect to the axes of rotation 5 and 6. Instead, there is a further pressure field 39 in on the side of the ring gear 3 or the pinion 4 opposite the pressure field 29 in the axial direction the housing 2 is formed.
- the pressure field 29 and the further pressure field 39 only have one overlap, namely in the area of the second sealing point 11.
- the overlap between the pressure field 29 and the pressure field 39 extends over at most 20 °, at most 15 °, at most 10 ° or at most 5 °.
- FIG. 11 shows a schematic representation of the internal gear fluid machine 1 in a further embodiment.
- This largely corresponds to the configuration described above, so that reference is made to the corresponding statements and only the differences are discussed below. These lie in the fact that the bearing bush 19 is now no longer required. However, this can optionally be present.
- a filler piece 40 is arranged between the inner toothing 7 and the outer toothing 8, so that the inner toothing 7 lies in the radial direction from the outside and the outer toothing 8 in the radial direction from the inside to the sealing piece 40.
- the filler 40 is substantially crescent-shaped. It can be made in one or more parts.
- the filler 40 is mounted in the housing 2 by means of egg 41 bearing 41.
- the bearing 41 is formed, for example, by a bearing pin which engages on the housing 2 at least on one side, but preferably on both sides, and extends through the filler piece 40.
- the filler 40 is rotatably mounted on the housing 2 via the bearing pin.
- the configurations of the support devices 21 and / or the pressure field 29 described above can also be transferred to the further configuration of the internal gear fluid machine 1.
- the internal gear fluid machine 1 described can be operated with different directions of rotation, in particular alternating or reversing.
- the internal gear fluid machine 1 can also be referred to as a reversible internal gear fluid machine 1. It is preferably in the form of a four-quadrant machine.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018222179.0A DE102018222179A1 (de) | 2018-12-18 | 2018-12-18 | Zahnradfluidmaschine |
| PCT/EP2019/085399 WO2020127082A1 (de) | 2018-12-18 | 2019-12-16 | Zahnradfluidmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3899280A1 true EP3899280A1 (de) | 2021-10-27 |
| EP3899280B1 EP3899280B1 (de) | 2024-06-05 |
Family
ID=69105796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19832039.2A Active EP3899280B1 (de) | 2018-12-18 | 2019-12-16 | Zahnradfluidmaschine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3899280B1 (de) |
| DE (1) | DE102018222179A1 (de) |
| WO (1) | WO2020127082A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12313068B2 (en) * | 2021-08-05 | 2025-05-27 | Hydraulik Nord Technologies GmbH | Internal gear machine with helical toothing |
| DE102021214270A1 (de) | 2021-12-13 | 2023-06-15 | Volkswagen Aktiengesellschaft | Bremssystem, Verfahren zum Betreiben eines Bremssystems und Kraftfahrzeug mit einem Bremssystem |
| CN114856720B (zh) * | 2022-04-20 | 2023-04-25 | 浙大宁波理工学院 | 一种用于超高速涡轮转子的密封装置 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19651683A1 (de) * | 1996-12-12 | 1998-06-18 | Otto Eckerle | Füllstücklose Innenzahnradpumpe |
| DE10109769A1 (de) * | 2001-03-01 | 2002-09-05 | Eckerle Ind Elektronik Gmbh | Füllstücklose Innenzahnradpumpe |
| DE10109770A1 (de) * | 2001-03-01 | 2002-09-05 | Eckerle Ind Elektronik Gmbh | Füllstücklose Innenzahnradpumpe |
-
2018
- 2018-12-18 DE DE102018222179.0A patent/DE102018222179A1/de active Pending
-
2019
- 2019-12-16 WO PCT/EP2019/085399 patent/WO2020127082A1/de not_active Ceased
- 2019-12-16 EP EP19832039.2A patent/EP3899280B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3899280B1 (de) | 2024-06-05 |
| DE102018222179A1 (de) | 2020-06-18 |
| WO2020127082A1 (de) | 2020-06-25 |
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