EP4423402A1 - Procédé de fabrication d'un dispositif de transmission comprenant une pièce rotative guidée en rotation à l'intérieur d'un carter - Google Patents
Procédé de fabrication d'un dispositif de transmission comprenant une pièce rotative guidée en rotation à l'intérieur d'un carterInfo
- Publication number
- EP4423402A1 EP4423402A1 EP22809455.3A EP22809455A EP4423402A1 EP 4423402 A1 EP4423402 A1 EP 4423402A1 EP 22809455 A EP22809455 A EP 22809455A EP 4423402 A1 EP4423402 A1 EP 4423402A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bearing
- housing
- preload
- cover
- opening
- 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.)
- Pending
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/49—Bearings with both balls and rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/042—Housings for rolling element bearings for rotary movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/067—Fixing them in a housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/07—Fixing them on the shaft or housing with interposition of an element
- F16C35/077—Fixing them on the shaft or housing with interposition of an element between housing and outer race ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/031—Gearboxes; Mounting gearing therein characterised by covers or lids for gearboxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/042—Guidance of lubricant
- F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
- F16H57/0424—Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2229/00—Setting preload
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2361/00—Apparatus or articles in engineering in general
- F16C2361/65—Gear shifting, change speed gear, gear box
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02026—Connection of auxiliaries with a gear case; Mounting of auxiliaries on the gearbox
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
- F16H2057/02052—Axle units; Transfer casings for four wheel drive
Definitions
- the invention relates to the field of transmission devices for a transmission chain of a mobility device, such as a motor vehicle for example.
- It relates to a method of manufacturing a transmission device comprising a housing and at least one rotating part, such as a shaft, guided in rotation by rolling bearings inside said housing.
- the invention also relates to a transmission device obtained by such a method.
- the document US2019003526 discloses a reduction device which comprises shafts equipped with toothed wheels.
- the reduction device comprises a casing comprising at least two parts fixed to each other and defining an internal space in which the shafts are housed.
- the shafts are each rotatably mounted on the housing via a pair of rolling bearings.
- Each rolling bearing comprises an outer ring, an inner ring and rolling bodies interposed between the outer ring and the inner ring.
- the internal rings are each fitted onto an internal bearing surface arranged at one of the ends of one of the shafts and resting in the direction of the other end of said shaft against an axial bearing surface.
- the outer rings of each pair of rolling bearings are respectively mounted in a housing formed in one and the other of the two parts of the housing.
- the housings have a cylindrical shape and thus form an outer bearing surface for the rolling bearings.
- the housings formed in one of the two parts of the housing are closed by a wedging plate.
- shims of varying thicknesses are arranged between the shim plate and the outer rings of the adjacent rolling bearings.
- the shims are thus intended to mount the shafts, in rotation on the casing without axial play in order to limit noise and vibrations.
- the thicknesses of the shims are chosen so that the shim plate exerts, via the shims, a satisfactory axial preload on each of the rolling bearings, that is to say a preload which is sufficient to reduce the noise and vibration of rolling bearings and shafts but without being excessive so as not to considerably increase the drag torque of the reduction device.
- One idea underlying the invention is therefore to propose a method of manufacturing a transmission device comprising a rotary part guided in rotation in a casing which solves the aforementioned drawbacks, that is to say which is simple and which makes it possible to limit or avoid noise and vibrations, likely to be generated by positioning clearances between the rotating part and the bearings due to the manufacturing tolerances of the components of the transmission device and/or phenomena contraction or thermal expansion of the elements of the transmission device.
- the invention provides a method of manufacturing a transmission device, the transmission device comprising a casing comprising at least a first part and a second part fixed to one another. the other by defining an internal space, the first part and the second part respectively comprising a first housing and a second housing, the first and the second housing respectively comprising a first and a second external bearing surfaces, the first part having an opening emerging in the first housing and the second part of the casing being equipped with an axial bearing surface bordering the second external bearing surface; the transmission device further comprising a rotating part having first and second internal bearing surfaces; the first and second internal bearing surfaces of the rotary part being respectively fitted in a first bearing and in a second bearing, the first bearing being mounted in the first housing and the second bearing being mounted in the second housing so that the first bearing is mounted radially between the first internal bearing surface and the first external bearing surface and that the second bearing is mounted radially between the second internal bearing surface and the second external bearing surface; the first bearing and the second bearing being locked axial
- the preload element makes it possible to preload the first and the second rolling bearings according to an adequate preload value. This makes it possible to limit or avoid noise and vibrations in a simple way, without requiring operations to measure the tolerances of the components of the transmission device.
- such a method may comprise one or more of the following characteristics.
- the preload element is fixed to the housing in said preload position so as to resist axial forces in the direction opposite to the preload greater than the preload, for example 1.5 to 15 times higher.
- the preload element is blocked on the casing in said preload position.
- the preload element is blocked on the casing with separate fastening means from the means applying the preload during the assembly process.
- the preload element is fixed to the casing by means of a weld. [0017]According to one embodiment, the preload element is fixed to the casing using assembly means such as screws or rivets.
- the weld or the means for assembling the preload element on the casing are capable of withstanding axial forces greater than the preload, for example 1.5 to 15 times greater.
- the weld or the assembly means of the preload element on the casing are capable of withstanding axial forces greater than 1000N, in particular greater than 1500 N, for example greater than 2000N.
- the cover forms the preload element.
- the second bearing bears against the axial bearing surface in the first direction.
- the preload element is not in plane surface support, perpendicular to the axis of rotation of the rotating part, against the casing when the preload element is fixed to the casing. This allows the preload element to be positioned relative to the first part of the housing in a plurality of preload positions corresponding to different preload values.
- the preload element is configured to be able to be fixed to the first part of the housing, in the first housing, in a plurality of axial preload positions.
- a value representative of said force is measured and the movement is stopped when the measured force is equal to the setpoint value.
- the method comprises a preliminary step of calibrating the equipment applying the force to the preload element. This ensures that the force applied to the preload element is equal to the set value without having to measure this force each time it is applied to the preload element.
- the preloading element is a cover and the cover is inserted into the opening so as to bear against the first bearing and to close said opening, the force applied to the preload being directed to compress the first bearing, the rotating part and the second bearing between the cover and the axial bearing surface of the second part of the casing.
- the cover has a dual functionality since it serves both to guarantee the sealing of the casing and to preload the bearings.
- the cover is fixed in leaktight manner to the first part of the casing in the preload position.
- the fixing of the cover has a dual function, namely ensuring that the cover is held in its preload position and guaranteeing the tightness of the attachment of the cover to the housing.
- the cover comprises a bottom wall and an annular skirt projecting axially from the bottom wall inside the first housing, the annular skirt resting against the first bearing, preferably against the outer ring of the first bearing.
- the annular skirt has a shape complementary to that of the first housing
- the cover is configured to dampen the vibrations agitating the rotating part.
- the first part of the casing comprises an orifice which passes through the wall of the first part of the casing near the housing and the cover comprises one or more passages to allow the circulation of oil from the orifice towards the housing, the cover being inserted into the opening by aligning the passage and the orifice.
- the rotating part is a hollow shaft having an internal bore
- the cover comprising a deflector projecting inside the hollow shaft and thus making it possible to deflect a flow of fluid inwards internal bore.
- the cover has a recess, in particular through it, and supports a functional element chosen from among a temperature sensor, a drain plug, a magnet and an electrical connection device, said functional element being arranged in said recess of the lid.
- the cover has a guide element for a wire or a pipe.
- the preload element is a sleeve which is interposed radially between the first external bearing surface and the first bearing and which comprises an axial bearing surface which is positioned bearing against the first bearing on a side opposite the opening, the force applied to the preload element being a tensile force exerted on the sleeve.
- the method comprises a step of closing the opening with a lid.
- the cover is sealed to the housing.
- the first bearing and the second bearing are rolling bearings each comprising an inner ring, an outer ring and rolling bodies interposed between the inner ring and the outer ring.
- the preload element bears against the outer race of the first bearing.
- the method comprises a step of machining the first and second external bearing surfaces, said machining step providing for associating the first part and the second part of the casing then inserting a machining tool into the internal space through the opening of the first part and machining the first and the second outer bearing surfaces with said machining tool.
- machining of the external bearing surfaces makes it possible to eliminate or limit misalignments, which contributes to further reducing noise and vibrations.
- the rotating part is a shaft of a reduction device, the shaft comprising one or two toothed wheels.
- the rotating part is an input shaft of a reduction device, said input shaft being intended to be coupled to a motor.
- the rotating part is an intermediate shaft of a reduction device, the intermediate shaft comprising a first toothed wheel intended to be driven in rotation by a motor and a second toothed wheel engaged with a toothed wheel of a differential device.
- the rotating part is a differential housing, the differential housing being coupled in rotation, directly or via a coupling device, to a toothed wheel, two satellite gears being rotatably mounted inside the differential housing along an axis of rotation perpendicular to the axis of rotation of the differential housing, two planetary gears being rotatable inside the differential housing along the axis of rotation of the differential, the two planetary gears each comprising a conical toothing which meshes with a complementary conical toothing of the two satellite gears, the gears sun gears each being intended to be integral in rotation with one of the two wheel axles of an axle of a vehicle.
- the transmission device comprises a plurality of rotating parts mounted guided in rotation by a pair of bearings inside the housing, the pair of bearings of several or all of the rotating parts being preloaded by means of a preload element mounted on the crankcase according to the aforementioned method.
- the invention provides a transmission device comprising:
- a housing comprising at least a first part and a second part fixed to each other and defining an internal space, the first part and the second part respectively comprising a first housing and a second housing, the first and the second housing respectively comprising first and second external bearing surfaces, the first part having an opening emerging into the first housing and the second part of the casing being equipped with an axial bearing surface bordering the second external bearing surface;
- a rotary part comprising a first and a second internal bearing surfaces respectively fitted in a first bearing and in a second bearing, the first bearing being housed in the first housing and the second bearing being housed in the second housing so that the first bearing is mounted radially between the first inner bearing surface and the first outer bearing surface and that the second bearing is mounted radially between the second inner bearing surface and the second outer bearing surface; the first bearing and the second bearing being locked axially with respect to said rotary part respectively in at least a first direction and a second direction opposite to said first direction;
- a preloading element configured to be adapted to be fixed to the first part of the casing, in the first housing, in a plurality of preloading positions in which the preloading element exerts an axial preload on the first bearing according to the first direction and the axial bearing surface of the second housing exerts an axial preload on the second bearing in the second direction; each preload position corresponding to a different axial preload value.
- the preloading element has a structure such that, before being fixed to the first part of the casing, it can assume a plurality of relative positions with respect to the first part of the casing.
- the axial preload value increases with the relative displacement of the preload element with respect to the first part of the casing in the first direction.
- the device has no plane surface contact, perpendicular to the axis of rotation of the rotating part, between the preloading element and the first part of the housing.
- the preloading element is a cover which is inserted into the opening so as to close said opening.
- the preload element is a sleeve which is interposed radially between the first external bearing surface and the first bearing and which comprises an axial bearing surface which is positioned bearing against the first bearing on a side opposite the opening.
- the device comprises a cover closing the opening.
- the cover comprises an annular skirt ensuring both the sealed closure of the opening and the pre-loading force.
- the opening is larger than the first level and the housing.
- the cover comprises a first axial sealing skirt to seal the opening and a second axial preload skirt, the second axial preload skirt being located radially to the inside the first axial sealing skirt.
- the first part of the housing comprises an orifice located radially between the housing and an edge of the opening and the cover comprising one or more passages connecting the orifice and the housing.
- Figure 1 is a perspective view of a casing of a transmission device.
- Figure 2 is a perspective view of the components of a transmission device intended to be housed in the housing of Figure 1 according to one embodiment.
- Figure 3 is a sectional view of the housing of Figure 1 passing through two housings intended to house rolling bearings guiding in rotation one of the shafts of the transmission device.
- Figure 4 is a schematic sectional view of a housing in which is housed a shaft guided in rotation by two rolling bearings.
- Figure 5 is a schematic view, in section, of a housing in which is housed a rolling bearing and of a cover, according to a first embodiment, which closes said housing and which exerts an axial preload on the rolling bearing.
- Figure 6 is a schematic view similar to that of Figure 5 and illustrating a second embodiment.
- Figure 7 is a schematic sectional view of a housing inside which a shaft is guided in rotation by three rolling bearings.
- Figure 8 is a schematic view similar to that of Figures 5 and 6 and illustrating a third embodiment.
- Figure 9 is a schematic view similar to that of Figures 5, 6 and 8 and illustrating a fourth embodiment.
- Figure 10 is a schematic view similar to that of Figures 5, 6, 8 and 9 and illustrating a fifth embodiment.
- the terms “external” and “internal” as well as the “axial” and “radial” orientations will be used to designate, according to the definitions given in the description, elements of the transmission device .
- the axes of rotation of the rotating parts of the transmission device define the "axial” orientation.
- the "radial” orientation is directed orthogonally to the axis considered and, from the inside outwards, moving away from the axis of rotation of the rotary part considered.
- a transmission device comprising a reduction device 1 and a differential device 2.
- the transmission device is intended for a motor vehicle. More particularly, the reduction device 1 is intended to transmit a torque with a transmission ratio of less than 1 between an electric motor, not shown, and the differential device 2, in order to increase the torque delivered by the electric motor.
- the reduction device 1 comprises an input shaft 3 which is intended to be coupled in rotation to the motor and an intermediate shaft 4.
- the input shaft 3 and the intermediate shaft 4 are intended to be rotatably mounted on the housing 13, shown in Figures 1 and 3, respectively along an X axis and a Y axis, parallel to each other.
- the input shaft 3 comprises a toothed wheel 5 and the intermediate shaft 4 comprises two toothed wheels 6, 7.
- the toothed wheel 5 of the input shaft 3 is in engagement with one of the toothed wheels 6 of the intermediate shaft 4 while the other toothed wheel 7 of the intermediate shaft 4 meshes with a toothed wheel 8 of a differential device 2.
- the toothed wheel 8 of the differential device 2 is rotatable around a Z axis, parallel to the X and Y axes. Furthermore, the differential device 2 comprises a differential housing 9 which is also rotatable around the Z axis and which is coupled in rotation to the toothed wheel 8 of the differential device 2
- the differential device 2 also comprises two satellite gears 10 - of which only one is visible in FIG. 2 - which are rotatably mounted on the differential housing 9 around an axis W, perpendicular to the axis X, two planetary gears 11, 12.
- the two planetary gears 11, 12 each comprise a bevel gear which meshes with a complementary bevel gear of the two planetary gears 10.
- the two planetary gears 11, 12 are rotatable around the Z axis and each comprise a splined hub intended to be integral in rotation with one of the two wheel shafts, not shown, of an axle of the vehicle.
- the differential device 2 makes it possible to distribute the torque coming from the electric motor to the two wheel shafts, by allowing the two wheel shafts to rotate at different speeds.
- the toothed wheel 8 and the differential housing 9 are coupled to each other by a coupling device which has, on the one hand, a coupled position in which it allows torque transmission between the toothed wheel 8 and the differential housing 9 and, on the other hand, an uncoupled position in which the transmission of torque between the toothed wheel 8 and the differential housing 9 is interrupted.
- the housing 13 of the reduction device 1 comprises at least two parts, namely a first part 14 and a second part 15 intended to be fixed to each other and defining an internal space 16 in which the reduction device 1 and the differential device 2 are housed.
- the rotating parts of the transmission device namely the input shaft 3, the intermediate shaft 4 and the differential housing 9 are each equipped with a pair of rolling bearings 16, 17, 18, 19 , 20, shown in Figure 2.
- the rolling bearings 16, 17, 18, 19, 20 of each pair are respectively positioned close to one and the other of the ends of the input shaft 3, the intermediate shaft 4 or the differential case 9.
- One of the rolling bearings 16, 18 of each pair is mounted in a housing of the first part 14 of the casing 13 while the other rolling bearing 17, 19, 20 is mounted in a housing of the second part 15 of the housing 13.
- Figure 3 only the housings 21, 22 intended to receive the rolling bearings 18, 19 guiding the intermediate shaft 4 in rotation are shown.
- Figure 4 schematically shows the housing 13, a shaft 23 and the two rolling bearings 24, 25 guiding said shaft 23 in rotation and housed in a housing 26, 27 of one or other of the two parts 14, 15 of the casing 13.
- the characteristics of the rolling bearings 24, 25 and of the housings 26, 27 of the casing 13 which will be described below are likely to apply to the guiding in rotation of one, several or all of the three rotating parts described above, namely the input shaft 3, the intermediate shaft 4 and the differential housing 9.
- each rolling bearing 24, 25 comprises an inner ring 28, an outer ring 30 and rolling bodies 29 interposed between the inner ring 28 and the outer ring 30.
- the rolling bodies 29 are here balls but can also be rollers or needles in particular.
- the inner ring 28 of each of the rolling bearings 24, 25 is fitted onto an internal bearing surface 31, 33 provided at one of the ends of the shaft 23.
- each internal bearing surface 31 , 33 is delimited in the direction of the other end of the shaft 23 by a shoulder 63, 64.
- Each shoulder 63, 64 thus defines a surface axial support against which abuts the inner ring 28 of the rolling bearing 24,
- the inner rings 28 are tightly mounted in a predetermined position on the shaft 23, which prohibits the axial movement of the rolling bearings 24, 25 along the shaft 23. rolling bearings are therefore locked axially on the shaft 23 at least in one direction.
- Each of the two parts 14, 15 of the housing 13 comprises a housing 26, 27 intended to house one of the two rolling bearings 24, 25.
- Each of the housings 26, 27 comprises an external bearing surface 32, 34 in shape of a cylinder of revolution.
- Housing 27 of part 15 of casing 13 comprises a bottom 35 as well as a shoulder which borders external bearing surface 32 on the side opposite to the internal space of casing 13. The shoulder thus defines an axial bearing surface 36 against which the outer ring 30 of the rolling bearing 25 is intended to come into abutment.
- the other part 14 of the housing 13 comprises an opening 37 which passes through the housing 13 and which opens into the housing 26. , the opening 37 has a diameter substantially equal to that of the outer bearing surface 32 of the housing 26.
- Such an opening 37 is particularly advantageous in several respects.
- This opening 37 is used in particular during the machining of the outer bearing surfaces 32, 34 of the housings 26, 27 of the two parts 14, 15 of the housing 13.
- the two parts 14, 15 of the housing 13 are assembled l to each other without the other components and in particular the shaft 23 and the two rolling bearings 24, 25 being present in the internal space of the housing 13.
- a machining tool is then introduced through the opening 37 in order to machine the two outer bearing surfaces 32, 34 of the two housings 26, 27 during the same machining operation.
- Such an implementation of the machining operations of the external bearing surfaces 32, 34 makes it possible to eliminate or at least to limit the misalignments between the external bearing surfaces 32, 34 of the two housings.
- this opening 37 also makes it possible to facilitate the operations aimed at axially preloading the rolling bearings 24, 25.
- a cover 38 is inserted into the opening 37 to seal the housing 13.
- the cover 38 also has a second functionality, namely to preload the rolling bearings 24, 25. To do this, after having inserted the cover 38 into the opening 37 and having positioned it in abutment against the rolling bearing 24, and more particularly against its outer ring 30, an axial force is applied on the cover 38 while a retaining force is applied to the housing 13 so that the cover 38 moves axially relative to the housing 13 in the direction corresponding to the arrow f1 in Figure 5.
- the rolling bearing 24 being axially locked at least in the direction f1 on the shaft 23 while the other rolling bearing 25 is locked axially on the shaft 23 in a direction opposite to f 1 , the force exerted by the cover 38 on the inner ring 28 of the rolling bearing 24 in the direction f1 passes through the shaft 23 and the other rolling bearing 25 until the axial bearing surface 36 of the other housing 27. This then exerts a reaction force in the opposite direction to f1 on the rolling bearing 25.
- the retaining force is applied to the first part 14 of the casing 13 closest to the rolling bearing 24.
- the first part 14 of the casing comprises a collar 65 which is formed around the opening 37 and which thus allows a tool, such as pliers, to retain the first part 14 of the casing 13 close to the rolling bearing 24 when a force is applied to the cover 38.
- the cover 38 is moved until the force applied reaches a set value.
- the cover 38 thus assumes a preload position which corresponds to the setpoint value.
- the rolling bearings 24, 25 as well as the shaft 23 are stressed in compression axially between, on the one hand, the cover 38, and, on the other hand, the axial bearing surface 36 of the housing 27.
- the two rolling bearings 24, 25 are thus preloaded, which limits vibrations.
- Cover 38 is then fixed in leaktight manner to casing 13 in said preload position, for example by a welding operation.
- the set point value is for example between 200 and 2000 N, preferably between 500 and 1500 N and for example of the order of 1000 N.
- the force is applied to the cover 38 by a force-controlled press.
- a force-controlled press comprises two elements which are movable relative to each other and against which the cover 38 and the casing 13 respectively bear.
- one of the two elements of the press is moved closer to each other by an actuator so as to move the cover 38 relative to the casing 13 in the direction f1 until the force exerted by the actuator reaches the set value.
- the cover 38 has a bottom wall 39 and an annular skirt 40 projecting perpendicularly to the bottom wall 39.
- the annular skirt 40 has a shape complementary to that of the housing 26. It thus fits into the housing 26. The cover 38 thus comes to bear against the outer race 30 of the rolling bearing 24 via the free end of the said annular skirt 40.
- a weld bead 41 is made over the entire outer periphery of the skirt annular 40 so as to fix the cover 38 in the preload position and to connect the annular skirt 40 in a leaktight manner to the outer bearing surface 32 of the housing 26.
- the same annular skirt 40 here ensures the leaktight closure of the opening 37 and the preload force on the rolling bearing 24.
- the annular skirt 40 has a thread and the housing 26 has a complementary thread.
- cover 38 is screwed into housing 26 until a threshold screwing torque representative of the set point value of the axial force to be applied by cover 38 against rolling bearing 24 is reached.
- Figure 8 shows a cover 42 according to another embodiment. This embodiment differs from the previous embodiment in that the cover 42 has yet another functionality: namely to provide an oil circuit inside the housing 26.
- the arrows schematically represent the circulation oil in housing 26.
- the opening 37 is larger than the first rolling bearing 24 and the housing 26.
- the cover 42 here comprises a first axial sealing skirt 71 to seal the opening 37 and a second axial preload skirt 40.
- the second axial preload skirt 72 is located radially inside the the first axial sealing skirt 71 .
- the first part 14 of the casing 13 comprises an orifice 43 which passes through the wall of the first part 14 of the casing 13 close to the housing 26.
- the orifice 43 is located above the housing 26 which allows the oil to circulate from the orifice 43 to the housing 26 by gravity.
- Orifice 43 is located radially between housing 26 and the edge of the opening.
- the cover 42 comprises one or more passages 44 allowing the circulation of oil from the orifice 43 to the housing 26. More particularly, a passage 44 is provided in the second axial preload skirt 40 of the cover 42. The passage 44 connects port 43 and housing 26.
- the shaft 23 is hollow and thus has an internal bore 46 which is arranged in the longitudinal direction of the shaft 23.
- the internal bore 46 allows the circulation of oil through the shaft 23.
- the cover 42 includes a deflector 45 which projects axially, from the bottom wall 39, inside the internal bore 46 of the shaft 23. The deflector 45 thus makes it possible to divert the flow of oil coming from the orifice 43 towards the internal bore 46 of the shaft 23.
- Figure 9 illustrates a cover 51 according to another embodiment.
- This embodiment differs from the embodiment of FIG. 5 in that the cover 51 has an additional functionality, namely a support function for a functional element 52 of the transmission device.
- the functional element 52, supported by the cover 51 can in particular be a temperature sensor, a drain plug, a magnet whose function is to capture the metallic debris present inside the casing 13 or an electrical connection device, for example intended to be connected to an electric actuator disposed inside the housing 13.
- the cover 51 includes a recess 53 through which the functional element 52 is fitted.
- Figure 10 illustrates a cover 66 according to yet another embodiment.
- the cover 66 has on the outer face of its bottom wall a guide element 67 to guide a wire, such as a wire intended to electrically supply an actuator or a sensor of the transmission device, or to guide a pipe, such as a pipe of a cooling fluid circuit.
- a wire such as a wire intended to electrically supply an actuator or a sensor of the transmission device
- a pipe such as a pipe of a cooling fluid circuit.
- Figure 6 illustrates yet another embodiment. This embodiment differs from the embodiments described previously in that the preloading of the rolling bearings 24, 25 is not carried out by the cover 54 closing the opening 37 opening into the housing 26 but by a preloading element 55 dedicated .
- the preload element 55 comprises a sleeve 56 which is disposed radially between the outer ring 30 of the rolling bearing 24 and the outer bearing surface 32 of the first housing 26.
- the sleeve 56 comprises a shoulder 57 which is positioned in abutment against the roller bearing 24, and more particularly against the edge of the outer ring 30 of the roller bearing 24 which is opposite the opening 37.
- the sleeve 56 also comprises a portion 58 which protrudes beyond the edge of outer ring 30 closest to opening 37.
- a tensile force is exerted on the preload element 55 in the direction represented by the arrow f2.
- the preload element 55 moves axially relative to the casing 13 in the direction f2 until the tensile force reaches a set value.
- the portion 58 of the sleeve 56 comprises radial holes 68 which are intended to receive the fingers of a pulling tool.
- the rolling bearing 24 is axially blocked on the shaft 23 in the direction f2, for example by means of a circlip 69.
- the other rolling bearing 25 is blocked axially on the shaft 23 in the direction f1 opposite to the direction f2.
- the other housing 27 has an axial bearing surface 36 which, compared to the embodiment shown in Figure 4, is positioned on the other side of the rolling bearing 25.
- the tensile force exerted on the rolling bearing 24 by the preloading element 55 passes through the shaft 23 and the other rolling bearing 25 and is taken up by the axial bearing surface 36 of the other housing 27.
- the surface of axial bearing 36 then exerts a reaction force in the opposite direction to f2 on the rolling bearing 25.
- the two rolling bearings 24, 25 are thus preloaded axially by the preloading element 55.
- the preloading element 55 is fixed axially relative to the housing 13 in said preload position.
- the preload element 55 is, for example, welded to the outer bearing surface 32 of the housing 27.
- a cover 59 is arranged so as to close the opening 37 and is welded in a sealed manner to the first part of the casing 13 all around the opening 37.
- Such a preload element 55 can in particular be used to preload two rolling bearings 24, 25 of a shaft 23 guided in rotation by three rolling bearings 24, 25, 60, as shown in FIG. 7.
- the casing 13 may, for example, comprise three parts 14, 15, 61 which are fixed to each other and each comprising a housing 26, 27, 62 intended to receive one of the three bearings 24, 25, 60.
- the housing 27 of the part 15 of the casing 13 comprises an axial bearing surface 36 against which the outer race 30 of the rolling bearing 25 is intended to come into abutment.
- the rolling bearing 24 which is housed in the housing 26 arranged on the side of the axial bearing surface 36 is axially preloaded by means of a preloading element 55, as described above in relation to 6, which exerts a tensile force on said rolling bearing 24.
- This preloading element 55 also makes it possible to axially preload the rolling bearing 25 between the axial bearing surface 36 and an element 70, such as a circlip , axially blocking rolling bearing 25 on shaft 23 in a direction opposite to f2.
- a cover 70 is also inserted inside the housing 27 in order to close it.
- the third rolling bearing 60 which is housed in the part 61 of the housing 13 arranged between the two other parts 15, 16 is not axially preloaded, in the embodiment shown.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
- Support Of The Bearing (AREA)
- Friction Gearing (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2111440A FR3128500B1 (fr) | 2021-10-27 | 2021-10-27 | Procédé de fabrication d’un dispositif de transmission comprenant une pièce rotative guidée en rotation à l’intérieur d’un carter |
| PCT/EP2022/080125 WO2023073125A1 (fr) | 2021-10-27 | 2022-10-27 | Procédé de fabrication d'un dispositif de transmission comprenant une pièce rotative guidée en rotation à l'intérieur d'un carter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4423402A1 true EP4423402A1 (fr) | 2024-09-04 |
Family
ID=80225778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22809455.3A Pending EP4423402A1 (fr) | 2021-10-27 | 2022-10-27 | Procédé de fabrication d'un dispositif de transmission comprenant une pièce rotative guidée en rotation à l'intérieur d'un carter |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240418253A1 (fr) |
| EP (1) | EP4423402A1 (fr) |
| CN (1) | CN118140059A (fr) |
| FR (1) | FR3128500B1 (fr) |
| WO (1) | WO2023073125A1 (fr) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE451824C (de) * | 1925-11-18 | 1927-10-25 | Norma Cie G M B H | Einrichtung zur Verminderung des Laufgeraeusches bei Waelzlagerungen |
| US2054782A (en) * | 1933-08-11 | 1936-09-15 | Falk Corp | Geared power unit for oil wells |
| US2352469A (en) * | 1942-11-02 | 1944-06-27 | Jack & Heintz Inc | Self-aligning and temperature compensating rotor bearing assembly |
| US2519122A (en) * | 1946-12-21 | 1950-08-15 | Clark Equipment Co | Transmission lubricating means |
| US2502874A (en) * | 1948-04-29 | 1950-04-04 | Bryant Grinder Corp | Spindle mounting for high speeds |
| US3285630A (en) * | 1963-11-14 | 1966-11-15 | Benjamin W Brundage | Torque arm swivel unit |
| US5295413A (en) * | 1992-10-14 | 1994-03-22 | General Motors Corporation | One-piece power transmission casing and a method of assembling a transmission mechanism therein |
| US6971802B2 (en) * | 2003-12-23 | 2005-12-06 | Vezina Martin J | Bearing preload cage assembly |
| CN102996653A (zh) * | 2011-09-13 | 2013-03-27 | 江苏八达重工机械有限公司 | 轴向力补偿式轴承预紧装置 |
| US20160281785A1 (en) * | 2015-03-23 | 2016-09-29 | Amarillo Gear Company Llc | Device and method for setting a bearing |
| US10781909B2 (en) | 2017-06-30 | 2020-09-22 | Tesla, Inc. | Windage tray for advanced lubrication and enhanced performance |
-
2021
- 2021-10-27 FR FR2111440A patent/FR3128500B1/fr active Active
-
2022
- 2022-10-27 WO PCT/EP2022/080125 patent/WO2023073125A1/fr not_active Ceased
- 2022-10-27 CN CN202280070234.6A patent/CN118140059A/zh active Pending
- 2022-10-27 US US18/701,473 patent/US20240418253A1/en active Pending
- 2022-10-27 EP EP22809455.3A patent/EP4423402A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023073125A1 (fr) | 2023-05-04 |
| CN118140059A (zh) | 2024-06-04 |
| FR3128500A1 (fr) | 2023-04-28 |
| US20240418253A1 (en) | 2024-12-19 |
| FR3128500B1 (fr) | 2024-03-15 |
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