EP2926006A1 - Pumpe, insbesondere axialkolbenpumpe mit abtastfläche an der schrägscheibe - Google Patents
Pumpe, insbesondere axialkolbenpumpe mit abtastfläche an der schrägscheibeInfo
- Publication number
- EP2926006A1 EP2926006A1 EP13789586.8A EP13789586A EP2926006A1 EP 2926006 A1 EP2926006 A1 EP 2926006A1 EP 13789586 A EP13789586 A EP 13789586A EP 2926006 A1 EP2926006 A1 EP 2926006A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- swash plate
- pump
- scanning
- sensor
- scanning surface
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/141—Details or component parts
- F04B1/146—Swash plates; Actuating elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2078—Swash plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/28—Control of machines or pumps with stationary cylinders
- F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
Definitions
- the invention relates to a pump, in particular an axial piston pump, with at least one inclination adjustable swash plate and at least one scanning system for detecting the inclination angle, wherein the scanning has at least one sensor and at least one scannable arranged by the sensor, movable with the swash plate scanning.
- An axial piston pump with these features is, for example, the V60N pump from HAWE InLine Hydraulik GmbH.
- the flow rate of the pump is set.
- hydraulically operated adjusting pistons are used for tilt adjustment.
- the inclination of the swash plate is detected by scanning surfaces on the circumference of the adjusting. The scanning surfaces are scanned by the sensor and are specially contoured in the direction of movement of the adjusting piston, so that each position of the adjusting piston can be assigned a tilt angle clearly.
- the known scanning system is disadvantageous in two respects: On the one hand, the adjusting pistons are difficult to access, so that a high level of design effort has to be operated in order to arrange the sensor close to the scanning surfaces. On the other hand, the conventional scanning leads to a larger design of the pump, because the piston must be extended so that the sensing surfaces can be scanned by the sensor over the entire piston stroke. Particularly in the case of pumps with high volume flows, this scanning system leads to unacceptable sizes.
- the invention has for its object to provide a structurally simple pump in which the inclination of the swash plate is detected and still builds small even at high flow rates.
- this object is achieved for the aforementioned pump in that the at least one scanning surface is located on the swash plate.
- a further advantage of the solution according to the invention is that the inclination of the swashplate is detected directly by the scanning surface located on the swashplate.
- the adjusting piston In the conventional scanning system in which the adjusting piston is scanned, a direct detection of the swash plate tilt is not possible.
- the scanning surface are located on a radially outward Shen facing peripheral surface of the swash plate.
- Such an arrangement of the sensing surface provides improved accuracy because for a given tilt, the deflection on the outer surface of the swashplate is greatest.
- the scanning surface may alternatively or additionally be located on an end face of the swash plate facing in the axial direction. In this embodiment, the access to the scanning can be done in the axial direction.
- the sensing surface may be located on at least one attached to the swash plate, separate donor element.
- This refinement has the advantage that differently contoured scanning surfaces can be combined with a single swashplate design:
- the scanning surface installed in the pump can be easily adapted to application-specific specifications by simply exchanging the donor element with otherwise unchanged components.
- the donor element is preferably repeatedly releasably attached to the swash plate.
- the transmitter element is designed as a separate component, then it can be made without much effort from a different material than the swash plate.
- the sensing surface may be made of a hardened and preferably ground steel.
- the transmitter element can be wedge-shaped in order to make the best possible use of the space available in the pump in consideration of the tilting movement of the swashplate.
- the plane in which the encoder element has a wedge shape preferably runs parallel to the direction of a drive axis of the pump.
- the donor element may be a flat body, so that it fits in the circumferential direction between existing components of the pump such as adjusting and / or delivery piston.
- Flat sides of the flat body can have in the circumferential direction, narrow sides in the radial and / or axial direction.
- a flat body in one of these designs can be incorporated into conventional pump designs without colliding with existing elements.
- the donor element may be inserted into a preferably groove-shaped receiving the swash plate.
- the receptacle may preferably extend in the direction of the sensor at and / or beyond the scanning area, in order to allow easier access to the scanning area.
- the inside width of the scanning surface can be greater than the width of a sensor, so that the sensor can enter into the receptacle.
- the donor element does not protrude from the swash plate.
- the transmitter element or the scanning surface can be sunk at least in sections into the swashplate. If the transmitter element in this embodiment does not protrude beyond the swashplate in the radial direction, a compact design is also possible. In particular, when received in a groove of the swash plate donor element this may be surmounted in the radial direction of the groove.
- the sensing surface of radially and / or axially outwardly accessible in a chamber of the pump is arranged.
- the accessibility from the outside facilitates the mounting of the sensor in the chamber.
- the scanning surface may also face a housing wall and preferably lie directly opposite it, so that the sensor is simply mounted in the housing wall.
- the sensor can be mounted according to a development in the radial and / or axial direction opposite the scanning on a housing or a housing wall of the pump. It can overlap the scanning surface in the radial and / or axial direction.
- the sensor can be screwed or otherwise fastened in a housing wall of the pump with respect to the scanning surface.
- the scanning surface can be spaced differently from a fixed housing point.
- the distance may change non-linearly with the inclination of the swash plate.
- the scanning can be curved according to a further advantageous embodiment.
- a non-contact sensor such as an optical, capacitive, magnetic, magneto-resistive, inductive and / or electromagnetic sensor comes into consideration.
- a mechanical sensor can be used.
- the mechanical sensor may have a movable scanning head resting against the scanning surface. The mechanical sensor can follow the movement of the scanning surface in such an embodiment.
- At least one conveying and / or adjusting piston is arranged on a side of the swashplate in the axial direction, then the scanning surface can project towards the side of the piston from the swashplate.
- the scanning surface can overlap the pistons or pumps in the radial direction.
- Fig. 1 is a schematic sectional view of a first embodiment of a pump according to the invention
- FIG. 2 shows a detail "A" of FIG. 1;
- Fig. 3 is a schematic perspective view of the swash plate of the pump according to Fig. 1;
- Fig. 4 is a schematic sectional view of another embodiment of a pump according to the invention.
- Fig. 1 shows a pump 1, here an axial piston pump.
- a drive shaft 2 rotates a set of delivery pistons 3, one end of which bears against a non-co-rotating, tilt-adjustable swash plate 4.
- inclined swash plate 4 drive against the swash plate 4 pressed, rotating with the drive shaft delivery piston 3 in the axial direction 5 in cylinder 6 on and off and promote the in the delivery chamber 7 contained fluid.
- the volume flow delivered by the delivery pistons 3 of the pump 1 depends on the inclination 8 of the swashplate 4 with respect to a reference plane 9 that is perpendicular to the axial direction 5.
- the inclination 8 of the swash plate 4 can be changed by one in FIG. 1 perpendicular to the image plane axis 8 'to be adjusted.
- To adjust the inclination 8 is at least one adjusting piston 10 which engages the swash plate 4. The more the swash plate 4 is inclined with respect to the reference plane 9, the greater the stroke of the delivery piston 3 in one revolution and thus also the amount of fluid delivered per stroke. If the swashplate 4 is placed vertically, ie aligned parallel to the reference plane 9, the delivery pistons 5 are not deflected during one revolution and the delivery volume is zero.
- the end positions 13, 14 of the inclination 8 of the swash plate 4 can be fixed by preferably housing-side stops 15, 16. In the end position 14, the swash plate 4 'bears against the stop 15, being aligned perpendicular to the axial direction 5. If the swash plate 4, as shown, the stop 16, it is maximally inclined.
- the swash plate 4 may be located in a chamber 17 that is preferably sealed from a pumping environment 18.
- the chamber 17 is in the radial direction 12 au Shen from a housing wall 19, which is part of a housing 20, surrounded.
- the housing wall 19 is located opposite a circumferential surface or an outer circumference 21 of the swash plate 4.
- a scanning system 22 is provided according to the invention, which has at least one scanning surface 23 and a sensor 24.
- the structure of the scanning system is apparent from Fig. 2, in which the detail "A" of Fig. 1 is shown enlarged.
- the at least one scanning surface 23 moves with the swash plate 4, while the sensor 24 is arranged stationary on the housing side.
- the scanning surface 23 may, in particular, as shown in FIG. 1, be arranged on the swash plate 4 and preferably move along with the swashplate 4 in a manner that is rigid with respect to movement.
- the scanning surface 23 is arranged in a scanning region 25 of the sensor 24, so that a change in position of the scanning surface 23 is detected by the sensor 24 when the inclination of the swash plate 4 is changed.
- the senor 24 outputs a slope signal 26 representative of the slope 8.
- the inclination signal 26 may include the inclination 8 in the form of an electrical, hydraulic or pneumatic signal encoded in analog or digital form.
- the slope signal 26 is a hydraulic signal in which a pressure in a control line (not shown) connected to the sensor represents the slope 8.
- the sensor 24 can operate without contact, for example inductively, magnetically or optically, or scan the scanning surface 23 mechanically.
- a mechanical scanning shows an example of the embodiment of FIGS. 1 and 2.
- the sensor 24 accordingly has a scanning head 27, which is pressed under a contact force 28 against the scanning surface 23.
- the contact pressure 28 is generated by a pneumatic, hydraulic and / or mechanical force transmitter 29, here a spring.
- the scanning head 27 is preferably guided only in the radial direction 12 movable and follows the movement of the scanning surface 23 when the inclination 8 of the swash plate changes and the scanning surface 23 moves with the swash plate 4 in the radial and axial directions.
- the scanning surface 23 is contoured so that with the inclination 8 of the swash plate 4, a distance 30 between a portion 31 of the housing 20 and the scanning surface 23 in the axially fixed scanning area 25 changes.
- Each inclination 8 of the swash plate 4 is assigned a different distance 30.
- the portion 31 may be that portion of the housing 20 to which the sensor 24 is attached.
- the housing-side sensor 24 detects the distance 30 by the scanning head 27 of the scanning surface 23 follows in the radial direction 12 and a control valve 32 opens or closes. The movement of the scanning head 27 changes via the control valve 32, a control pressure, which serves as a tilt signal 26.
- a linear or a non-linear relationship between the inclination 8 of the swash plate and the course of the inclination signal 26 can be produced.
- the distance 30 may change non-linearly with the incline 8. This makes it possible to take account of an inclination angle-dependent control parameter directly in the inclination signal 26 generated by the scanning surface 23.
- the scanning surface 23 is accessible from the outside in the radial direction 12 and the sensor 24 is arranged overlapping the scanning surface in the radial direction.
- This embodiment leads in the axial direction to a compact design of the pump. 1
- the sensor 24 requires space in the radial direction.
- An alternative design is described below with reference to FIG. 3.
- the at least one scanning surface 23 may be part of at least one separate donor element 33, which is preferably repeatedly removably attached to the swash plate 4.
- the donor ment 33 can taper in a wedge shape, so that it can follow the movement of the swash plate without large volume requirements.
- the transmitter element 33 projects in the axial direction 5 with respect to the swashplate 4, for example in the direction of the adjusting piston 10 and / or the delivery piston 3.
- FIG. 3 shows that the at least one transmitter element 33 is a flat body whose narrow sides 34 point in the radial direction 12 and in the axial direction 5.
- the flat sides 35 point in a circumferential direction 36.
- the encoder element 33 is inserted into a preferably groove-shaped recess or receptacle 37 of the swash plate 4.
- the receptacle 37 is for example an axial groove whose base 38 has radially outward Shen.
- the receptacle 37 is open at at least one of its two ends 38 located in the axial direction.
- the at least one transmitter element 33 can also be arranged in the region of a radially outwardly projecting outer horn 40 of the swashplate 4.
- the sensing surface 23 is surmounted in the receptacle of wall portions 41 of the swash plate 4 to Au odium 21 out.
- the clear width 42 of the receptacle 37 in the circumferential direction 36 is greater than the width 43 of the scanning head 27 in this direction.
- the scanning head 27 of the sensor 24 can thus retract into the receptacle 37 in at least one position of the swashplate 4.
- the receptacle 37 can expand in the radial direction 12 to the outside. As a result, the scanning head 27 can be better absorbed.
- Fig. 4 shows a further embodiment of the invention. For brevity, only the differences from the previous embodiment will be discussed. For elements whose structure and / or function correspond to elements already described, the same reference numerals are used.
- the sensor 24 is arranged in Fig. 4 in the axial direction 5 with the scanning surface 23 overlapping. Such a configuration leads in the radial direction to a smaller space requirement, as the comparison between Fig. 1 and 4 directly shows.
- the scanning head 27 follows in this embodiment, the movement of the scanning surface 23 in the axial direction.
- the same sensor 24 as in FIG. 1 may be used.
- the scanning surface 23 is correspondingly contoured in such a way that the inclination-dependent deviation stood now 30 in the axial direction, the inclination 8 clearly reproduces.
- the scanning surface 23 is now freely accessible in the axial direction on the swash plate 4 with respect to the housing wall 18.
- the scanning surface 23 is located on an axial direction 8 facing end surface 44 of the swash plate
- the donor element 33 may be inserted into a receptacle 37, which, however, is preferably configured as a radial groove, which at a radially in the end 38th can be open.
- the transmitter element can also be arranged here in the region of a horn 40 and at least partially sunk in the swash plate.
- the scanning surface 23 can be shortened if the scanning head 27 is extended accordingly. This can go so far that the swashplate-side sensing surface is almost point-shaped and the scanning head is similar to the scanning surfaces 23 of FIG. 1 to 4 configured.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012221922.6A DE102012221922A1 (de) | 2012-11-29 | 2012-11-29 | Pumpe, insbesondere Axialkolbenpumpe mit Abtastfläche an der Schrägscheibe |
| PCT/EP2013/073849 WO2014082865A1 (de) | 2012-11-29 | 2013-11-14 | Pumpe, insbesondere axialkolbenpumpe mit abtastfläche an der schrägscheibe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2926006A1 true EP2926006A1 (de) | 2015-10-07 |
| EP2926006B1 EP2926006B1 (de) | 2020-04-29 |
Family
ID=49578318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13789586.8A Active EP2926006B1 (de) | 2012-11-29 | 2013-11-14 | Pumpe, insbesondere axialkolbenpumpe mit abtastfläche an der schrägscheibe |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2926006B1 (de) |
| DE (1) | DE102012221922A1 (de) |
| WO (1) | WO2014082865A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015205548B4 (de) * | 2015-03-26 | 2017-05-24 | Danfoss Power Solutions Gmbh & Co. Ohg | Endlagendetektion in einer verstellbaren hydraulikmaschine |
| CN109441752A (zh) * | 2018-09-30 | 2019-03-08 | 江苏金陵智造研究院有限公司 | 一种液压伺服控制系统用伺服泵 |
| EP4036403B1 (de) * | 2021-01-29 | 2023-12-27 | InLine Hydraulik GmbH | Fluidpumpe, steuerungssystem für eine fluidpumpe, und verfahren zum steuern einer fluidpumpe |
| DE102021201409A1 (de) | 2021-02-15 | 2022-08-18 | Robert Bosch Gesellschaft mit beschränkter Haftung | Verdrängermaschine mit einer Messvorrichtung für das Verdrängungsvolumen |
| CN116512597B (zh) * | 2023-06-01 | 2023-11-21 | 昆山市第一人民医院 | 一种3d矫形鞋垫的制作方法、装置 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2037635A1 (de) * | 1970-07-29 | 1972-02-03 | Robert Bosch Gmbh, 7000 Stuttgart | Verstellbare Axialkolbenmaschine |
| JP3303333B2 (ja) * | 1992-06-09 | 2002-07-22 | 株式会社豊田自動織機 | 可変容量型圧縮機における容量検出装置 |
| DE19608228B4 (de) * | 1996-03-04 | 2006-03-16 | Linde Ag | Hydrostatische Axialkolbenmaschine |
| DE19819960B4 (de) * | 1998-05-05 | 2005-03-03 | Robert Bosch Gmbh | Axialkolbenmaschine mit integriertem Schwenkwegmeßsystem |
| US6848888B2 (en) * | 2002-12-12 | 2005-02-01 | Caterpillar Inc. | Sensor for a variable displacement pump |
| US7275474B2 (en) * | 2005-05-31 | 2007-10-02 | Parker-Hannifincorporation | Optical position sensing and method |
| DE102007022568A1 (de) * | 2007-05-14 | 2008-11-20 | Robert Bosch Gmbh | Niederhaltesegment |
| US8202058B2 (en) * | 2008-08-13 | 2012-06-19 | Sauer-Danfoss Inc. | Variable displacement piston machine with a sensor |
| SE533414C2 (sv) * | 2008-09-17 | 2010-09-21 | Parker Hannifin Ab | Oklägessensor för en hydraulisk anordning |
-
2012
- 2012-11-29 DE DE102012221922.6A patent/DE102012221922A1/de active Pending
-
2013
- 2013-11-14 EP EP13789586.8A patent/EP2926006B1/de active Active
- 2013-11-14 WO PCT/EP2013/073849 patent/WO2014082865A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014082865A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014082865A1 (de) | 2014-06-05 |
| DE102012221922A1 (de) | 2014-06-05 |
| EP2926006B1 (de) | 2020-04-29 |
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