JP5232780B2 - Axial piston device with additional disk on retainer disk, corresponding retainer disk and corresponding additional disk - Google Patents

Description

  The invention relates to an axial piston device or a retainer disc or an additional disc according to the preambles of claims 1, 2 and 5, respectively.

  In the case of an axial piston device, when the piston performs an induction stroke, an axial force acts on the piston, for example with the corresponding slide block, trying to lift it from the rotating swash plate. This is prevented by a retainer device having a retainer disk for the piston head or slide block. Since the axial force can be quite large, in order to protect the retainer device from overload and breakage, there is a way to engage and support the back of the retainer device by the support device in the event of a load peak. Already known.

  In the case of the axial piston device described in Patent Document 1, such a support device is provided by a fixing ring that sits in the inner groove of a rotary swash plate in the form of a pivot plate and engages the retainer disk behind the retainer device. Composed. In this known structure, the holding and supporting forces are absorbed by the retainer disk and transmitted via a so-called swivel saddle in the cylinder body of the axial piston device.

  In Patent Document 2, a support device that supports a retainer device is configured by a support tappet that is mounted so as to be radially displaceable in a radial guide hole in a housing and is pressed radially inward by a spring. An axial piston device is described. The support tappet has inclined surfaces at its inner end that are inclined with respect to the plane of the corresponding retainer disk, and the support tappet engages behind the outer edge of the retainer disk by these inclined surfaces. . Due to the inclined surface, this conventionally known support device has the following drawbacks. Basically, the disadvantage is that contact between the retainer disk and the holding tappet results in friction, wear and resulting heat generation. If the slope of the inclined surface is too great, there is an additional risk that the retainer disc pushes the support tappet outward due to the axial tensile force of the piston, so that the support tappet loses their effectiveness and Support force cannot be applied to the retainer disk or only reduced support force can be applied. In addition, in the case of this known structure, especially when a rotatable swash plate is present, stress is generated between the retainer disk and the support tappet, which is the inclination position of the retainer disk during the rotation of the rotary swash plate. Is caused by a change.

  A retainer disk known from US Pat. No. 6,057,086 has a receiving opening arranged on the circumference for the slide block and a central opening, whereby the retainer disk rests on a thrust bearing. In the case of a rotatable swash plate, the thrust bearing can have a saddle-shaped, partially spherical support surface on which the rotary swash plate can be rotated. The holding force for the slide block is applied by the holding side of the retainer disk facing the rotating swash plate, on which the slide block rests. The cylindrical portion of the slide block penetrates the retainer disk housing openings, and these housing openings are in the shape of an ellipse in the radial direction in the case of a rotatable swash plate. On the free side of the retainer disk that is axially opposite the holding side, the receiving opening is extended by an annular collar protruding from the free side. The purpose of these annular collars is to provide a sufficiently large guide surface for the portion of the slide block that projects through them. In addition, the annular collar helps to stabilize the retainer disk. A retainer disk with an annular collar is preferably pressed from a die punch as a single part, and the annular collar, and preferably also a spherical center support ring, is stamped as a single part by pressing. Due to the increased stability of the retainer disk, particularly due to the annular collar, the retainer ring can be realized with a relatively thin disk body supporting the ring collar, resulting in a relatively lightweight retainer. A disc is obtained. This is required in order to keep the bending moment generated by the centrifugal force of the retainer disk during the rotational movement of the axial piston device as small as possible.

German Patent Application Publication No. 3901064A1 US Pat. No. 2,101,213 German Patent Application Publication No. 19751994A1

  The invention is based on the object of improving the support function in the case of an axial piston device, or in the case of a retainer disc for an axial piston device, or in the case of a retainer disc or an additional disc for an axial piston device. This improvement can be made in several aspects, for example, improved space utilization and retainer disk compatibility, improved or facilitated material selection, and reduced wear or extended service life with suitable materials. is there.

  This object is achieved by the features of claims 1, 2 and 5. Advantageous developments of the invention are described in the respective dependent dependent claims.

  In the case of the structure according to the invention according to claim 1 or 2, in each case one or more resting on the free side of the retainer disk, in the edge region axially opposite the support part, at least on the free side An annular additional disk is arranged which is fastened to the retainer disk by the fastening elements.

  In the case of the structure according to the invention according to independent claim 5, the additional disk has on its axial side a radial bearing surface and one or more fastening elements, each fastening element being an additional disk It is a part of the fastening apparatus which fastens to a retainer disk.

  An additional disk is common to all structures according to the invention, which rests on or is fastened to or can be fastened on the free side or free surface of the retainer disk, or the free side or free surface of the retainer disk. Realized to rest on and fasten to it. In this case, the additional disk can be fastened to the retainer disk in a detachable or non-detachable manner, or can be fastened.

  In all cases, the additional disc is an additional part that is manufactured prior to production and fastened to the retainer disc, for example by adhesive application, overmolding, overmolding or lock engagement, or of an axial piston device. During final assembly, additional disks can also be loaded and fastened, for example by lock engagement. In the case of a detachable fastening device, for example, additional disks with different thicknesses can be used instead of the additional disks.

  In any case, in the assembled state, the additional disc is a component that can be located between the support portion and the retainer disc to meet various requirements. If at least one support part and / or retainer disk can be used for different axial piston device structures, and a certain total thickness is pre-defined for the retainer disk, the retainer disk can be installed by mounting an additional disk Can be adapted to the desired thickness requirements.

  However, the additional disk also fulfills other requirements, for example, preferably when the additional disk is made of a hard elastic material such as an elastic material or plastic, wear resistance or useful life, or in particular the additional disk impinges on the support part. Attenuation function can be improved.

  The additional disk according to the invention also results in an expansion of the support surface available for contact with the support part. This enlargement of the support surface is obtained in the edge region between the two receiving holes in the retainer disk, in particular for the slide block. The widened portion of the additional disk extends at least partially into these gaps, so that the required expansion of the support surface can be performed.

  In the case of a retainer disk with an annular collar extending the receiving hole on the free side, if the additional disk overlaps in each case the outer region of the annular collar with a tapered wall portion, the expansion of the support surface is achieved by the receiving hole and the retainer. It can also be achieved in the area between the outer periphery of the disc. In order to accommodate the outer overlapping part of the annular collar, the additional disk can have, for example, a suitable recess on its carrying side, in which the overlapping part of the annular collar is accommodated.

  At least one of the widened portions of the additional disk can also result in a positive effective positioning of the additional disk on at least one annular collar or between two annular collars circumferentially adjacent to one another, i.e. circular Two widened portions adjacent to each other in the circumferential direction rest on both sides of the annular collar, or at least one widened portion rests on two annular collars adjacent to each other in the circumferential direction.

  The retaining disk circumference or edge region of the retainer disk is particularly well suited for locking engagement, and the corresponding locking engagement edge can also be located on the holding side circumference or edge. A corresponding lock engagement arm having a lock engagement lug can extend from the additional disk to the retaining side of the retainer disk on the circumference of the retainer disk and engage behind it.

  The present invention is suitable for various types of axial piston devices, for example rotating swash plate structures, oblique shaft structures or wobble plate structures. If the rotating swash plate structure and the inclined shaft structure are capable of rotating about the horizontal axis instead of about the longitudinal axis of the shaft, the support portion of the support device is optional and the German patent application is published. It can be fastened to a housing or fastened to a rotating swash plate as shown in DE19800631A1. On the other hand, in the case of a wobble plate, the support portion must be fastened to the wobble plate.

  Further development results in a simple structure for at least one additional disk, which structure can be advantageously incorporated, is space-saving and can be manufactured at low cost.

Axial sectional view of an axial piston device according to the invention 1 is an enlarged view of a partial cross section along II-II in FIG. 1 of a retainer disk to which an additional disk of an axial piston device is fastened. Bottom view of retainer disc according to FIG. Sectional view corresponding to FIG. 2 of a retainer disk with an additional disk of modified structure Bottom view of retainer disc with additional disc according to FIG. Diagram showing the additional disk according to FIG. 2 as a single part Bottom view of additional disc according to FIG. Diagram showing the additional disk according to FIG. 4 as a single part Bottom view of the additional disc according to FIG.

  The advantageous structure of the present invention is more fully described below with reference to preferred exemplary embodiments and drawings.

  FIG. 1 shows an axial piston device 1, which has a shaft 3, which is rotatably mounted in a housing 2, on which a cylinder body is arranged, and which has a cylinder body 4. And the shaft 3 is connected to each other in a non-rotating state. The shaft 3 passes through the cylinder body 4 and is mounted in the respective rolling bearings 5 and 6 on both sides of the cylinder body 4, and the outer bearing ring 7 of the rolling bearing 6 is fitted with a corresponding recess ( Inserted in the groove). A plurality of cylinder bores 9 distributed over the entire circumference are realized in the cylinder body 4, and the central axis of the cylinder bore 9 extends, for example, in parallel to the central axis of the shaft 3. Inserted into the cylinder bore 9 are axially displaceable pistons 10, which have a spherical head 11 on the side facing away from the housing cover 8, which is a slide block 12. The joint joint is formed in cooperation with the corresponding recess. The piston 10 is placed on the rotating swash plate 13 by the slide block 12. Therefore, when the cylinder body 4 rotates, the piston 10 performs a stroke motion in the cylinder bore 9. The height of the stroke in this case is determined by the position of the rotary swash plate 13, and the position of the rotary swash plate 13 in the exemplary embodiment can be adjusted by the positioning device 14.

  The cylinder body 4 has a central opening 15 in which a compression spring 16 restrained between a first spring receiver 17 and a second spring receiver 18 is disposed. In this case, the first spring receiver 17 is fixed at a predetermined position in the axial direction by the shaft 3, whereas in the illustrated exemplary embodiment, the second spring receiver 18 is inserted into the groove of the cylinder body 4. It is configured by a snap ring. Therefore, the cylinder body 4 is displaced in the axial direction by the force of the compression spring 16 to the extent that it is sealed on the control plate 20 by the end face 19. Control openings 22 and 23 connected to the low-pressure connection 26b are arranged. The cylinder bore 9 is opened toward the end surface 19 of the cylinder body 4 through the opening 21. The control plate 20 is attached to the housing 2 by a dwell pin 31 so as not to rotate.

  During the pressure stroke, the slide block 12 is held in contact with the rotary swash plate 13 by the slide surface 25 by the pressure prevailing in the cylinder bore 9 during operation of the axial piston device 1. However, during the latter half of the rotation of the cylinder body 4, a negative pressure is generated in the cylinder bore 9, which in particular in the case of the operation of the axial piston device 1 in an open circuit, causes each half of the slide block 12 to rotate obliquely. It tries to lift away from the plate 13. In order to prevent this, a retainer disk 24 is provided, which applies a holding force to the slide block 12 and thereby holds the slide block on the slide surface 28 of the rotary swash plate 13.

  The retainer disk 24, which will be described in more detail below with reference to FIGS. 2 to 4, has a central through-opening 32 so that it rests on the thrust bearing 29. In the exemplary embodiment shown, the thrust bearing 29 is fixed to the shaft 3 so that it cannot be displaced axially in the direction of the housing cover 8. The thrust bearing 29 has a spherical outer shape, which allows the inclination angle of the retainer disk 24 relative to the shaft 3 to be changed corresponding to the surface defining the central through opening 32. In order to be able to transmit the holding force between the retainer disk 24 and the slide block 12, a shoulder surface 33 is realized on each slide block 12, which is towards the rotary swash plate 13 of the retainer disk 24. It is in contact with a flat holding surface 34a on the facing holding side 24a. The slide block 12 also has guide portions 35 that extend through respective slide block receiving openings 36 provided in the retainer disk 24. In each case, the radial extent of the slide block receiving opening 36 is larger than the guide portion 35 of the slide block 12, and in this region the guide portion is cylindrical.

  In order to allow the slide block 12 to tilt with respect to the piston 10 according to the tilt of the rotary swash plate 13, the slide block 12 is provided with a recess 37 in the region of the guide portion 35. The shape corresponds to the spherical head 11 of the piston 10. The spherical recess 37 in this case is closed around the spherical head 11 to such an extent that a tensile force can be transmitted between the slide block 12 and each piston 10. Lubricant is applied to the contact surface from the cylinder bore 9 through the lubricant bore in the piston 10.

  2 shows the retainer disk 24 with a guide collar 38 formed at the edge of the receiving opening 36 on the free side 24b opposite the holding side 24a and holding surface 34a. A collar 39 of the central through-opening 32 is formed on the holding side 24a, and the guide collar 38 and the collar 39 are formed from a disk-shaped basic body having a thickness d. In this case, the guide collar 38 protrudes from the free surface 34b, which is preferably flat, determines the thickness d of the basic disk of the retainer disk 24, and faces away from the rotary swash plate 13. Therefore, it lies on the opposite side of the flat holding surface 34a in the axial direction. The collar 39 in this example realizes a spherical geometry on the inner surface 41 defining the central through-opening 32 corresponding to the spherical geometry 42 shown schematically and corresponding to the outer shape of the thrust bearing 29. Formed to be. The collar 39 is so formed from the basic body of the holding disc 24 that protrudes axially from the holding surface 34.

  The length of the receiving opening 36 is extended by the guide collar 38 to stabilize the retainer disk 24. The formation of the basic disc realized as a flat circular disc is preferably carried out by so-called pressure forming or pressing in a single processing step simultaneously with the punching of the central through opening 32 and the receiving opening 36. In order to form the collar 39 and the guide collar 38, the edges of the basic body defining the central through-opening 32 and the receiving opening 36 are pressed or pressed to provide additional hardening of the retainer disk 24 material. To be achieved. Accordingly, the thickness d of the material of the basic body can be further reduced without causing a problem of fatigue strength in the operation of the axial piston device 1.

  Thus, the retainer disk 24 can be made as a single part in one processing step by punching the holes 32 and 36 and immediately followed by pressing, or by two processing steps, namely punching and pressing. Can do.

  In order to flatten the holding surface 34a, this surface can be machined so that the material can be removed following pressing, which can be done before machining to remove the material. 2 and 4 are shown by a one-dot chain line 34c indicating the holding surface 34a.

    2 and 4 show the retainer disk 24 in a finished shape. The retaining surface 34a can be formed by pressing or pressing, or subsequently by machining to remove material. The pressure-molded initial surface is indicated by 34c. The molding height h of the guide collar 38 is preferably 50% to 75% of the thickness d of the basic body. It is particularly preferred that the molding height h is selected such that its ratio to the total height H is about 40%.

  The accommodation opening 36 is arranged on a circular portion 51 that is similarly concentrically arranged with respect to the outer shape 50 of the retainer disk 24. In the illustrated exemplary embodiment, nine receiving openings 36 are arranged in a uniform distribution on the circular portion 51, and the receiving openings are only a few mm from the outer shape of the retainer disk 24, for example about 1 to At a slight radial distance of 2 mm.

  In addition, each guide collar 38 is surrounded by an outer surface portion 52 which is a surface portion of the free surface 34b.

  When the axial piston device 1 is in functional operation, the pistons 10 each perform a guiding stroke and apply a pulling force to the retainer disc 24, which causes the pistons 10 to be hydraulic during their guiding stroke. Resulting from drawing hydraulic fluid. The resulting induced pull force is represented by arrow 55 in the right half of FIG. 2, which illustrates the induced stroke range. The retainer disk 24 resists this induced tensile force 55 by its strength and its resistance moment, and the retainer disk applies a holding force 56 of at least the same magnitude as the induced tensile force 55 opposite to the induced tensile force.

  However, in the case of a peak load, the retainer disk 24 is bent by the resulting induced pulling force 55 by applying a load exceeding its elastic limit in each half of each side by the rotating swash plate 13 so that the retainer disk 24 is bent. It can be damaged by excessive stress, or it can be subjected to carrying stress that is large enough to bend. In contrast, the aforementioned loads that are within the elastic range of the retainer disk 24 do not cause damage.

  In order to prevent overload as described above, the axial piston device 1 has a support device, indicated generally at 58, which is located in the central region of its induction stroke range present on one half of the retainer disk 24. It has a support portion 58a that engages with an axial movement play a behind it, and therefore engages the outer edge region, as shown in the right half of FIG.

  In this case, according to the invention, the retainer disk 24 has an annular additional disk 61 on the free side 24b facing away from the rotary swash plate 13, which is seated in the edge region of the free surface 34b. In addition, it has one or more fastening elements 62a that are part of a fastening device 62 that fastens the additional disk 61 to the retainer disk 24 in a non-releasable or releasable manner.

  The axial thickness c of the additional disk 61 is dimensioned such that the axial distance a from the support element 58a is ensured. The distance a is such that, in the case of an axial load due to the resulting induced tensile force 55, the retainer disk 24 is supported before it hits the support portion 58a and reaches the elastic limit of the retainer disk 24. The dimensions are determined to be. Thereby, the distance a is, on the one hand, such that no friction or wear occurs between the support part 58a and the additional disk 61 in the normal functional range, and on the other hand, the retainer disk 24 in the axial direction in the case of a load peak. It can be supported, so that overload exceeding the elastic limit is prevented.

  The additional disc 61 is a round annular disc, whose radial dimension e is preferably greater than its axial thickness c.

  If the retainer disk 24 does not have any protruding guide collar 38, the additional disk 61 extends radially from its circumference 50a to the receiving opening 36 and also extends radially inward between the receiving openings 36. can do.

  Within the scope of the present invention, the additional disc 61 can be fastened to the retainer disc 24 in a releasable or non-releasable manner before the production, or can be mounted during assembly of the axial piston device 1 and fastened to the retainer disc 24 Is possible.

  The fastening device 62 is preferably a lock engagement device, which allows fast and easy handling and can be detachable or non-detachable.

  However, for example, in order to attach the additional disk 61 to the retainer disk 24 with an adhesive or to integrally form the additional disk 61, it is possible to perform non-detachable fastening. For example, lap integral molding can be performed in order to produce the additional disc 61 from plastic prior to the main production by overcasting or over-injection molding, which can be carried out with known molding equipment. In this case, the preferably flat support surface 61a of the additional disc 61 constitutes the fastening element.

  However, the material plastic for the additional disc 61 is also beneficial for other reasons, since the additional disc 61 can be easily and inexpensively manufactured as a separate injection molded part including at least one fastening element 62a. . However, due to its elasticity, the plastic material can also provide a damping effect when the additional disk 61 collides with the support portion 58a.

  The fastening device 62 can be constituted by one or more lock engaging devices distributed on the circumference. In the case of the exemplary embodiment according to FIG. 8, for example by an annular or circumferential wall 64 that extends over the entire circumference and protrudes axially from the additional disc 61 and above the bearing surface 61a. A locking engagement device is provided, the annular or circumferential wall overlying the retainer disk 24 or its basic disk, and a circumferentially continuous locking engagement lug 65, or circle The locking engagement lugs arranged in an arc shape hold the additional disk 24 so that the additional disk 24 can be clamped on the additional disk 61 by the circumferential wall 64 and preferably can also be released therefrom. Elastically engages behind the edge of the surface 34a. The circumferential wall in this case can protrude upward from the holding surface 34a.

  Due to the presence of the circumferential wall 64, the radial width e has already increased by the thickness of the circumferential wall 64.

  In the case of the exemplary embodiment according to FIGS. 6 and 7, arcuate lock engagement arms 66 are arranged in a distributed manner on the circumference, and the lock engagement arms are approximately from the additional disk 61. The length of the lock engagement lug 65 that extends parallel to the axial direction and engages behind the edge of the holding surface 34a is determined by a lock engagement lug 65 disposed inside. In this configuration as well, the additional disk 61 can be clamped on the retainer disk 24, and preferably it can also be released, and the lock engagement lug 65 of the lock engagement arm 66 is retained by the retainer. When it is clamped on the circumference of the disk 24, it jumps out, and conversely, when it is released, it jumps back.

  The lock engaging arm 66 can be constituted by, for example, a radial slot 67 in the circumferential wall 64, which spans the entire axial length of the circumferential wall 64 or only a portion of the axial length. Can be extended to Here again, the additional disk 61 projects radially outwardly above the retainer disk 24 by the thickness of the lock engagement arm 66.

  The additional disc 61 is suitable for combination in a particularly advantageous manner with the retainer disc 24 having a guide collar 38 projecting on the free side 24b. If such a guide collar is present, the surface area 52 of the free surface 34b, which is respectively arranged outside the receiving hole 36, is reduced by the radial dimension of the corresponding guide collar 38. As a result, the support portion 58a can only obtain a slight support surface on the retainer disk 24. Accordingly, the radial width e of the additional disk 61 is made larger than the radial dimension f of the surface portion 52 radially outward from the guide collar 38, and the thickness c of the additional disk 61 is made equal to or greater than the height h of the guide collar 38. It is advantageous. In addition, the additional disc 61 has an open recess 68 for the guide collar 38 on the radially inner side, which preferably matches not only the dimensions of the guide collar 38 but also their shape, ie roundness. . Thus, the additional disk 61 has a widened disk portion 61b extending radially inward, which extends between the guide collars 38 adjacent to each other and preferably in the circumferential direction up to the guide collar 38. Extend. Thus, the additional disc 61 has a larger radial dimension than the region of the carrying surface portion 52, at least in the region of the disc portion 61b. Thus, a larger support surface can be utilized to support the additional disc 61 on the support portion 58a in the region of the disc portion 61b, resulting in a reduction in surface unit pressure.

  In the exemplary embodiment according to FIGS. 8 and 9, in which the same or corresponding parts are given the same reference numerals, the thickness c of the additional disk 61 is greater than the height h of the guide collar 38. The additional disk 61 also overlaps the guide collar 38 at the corresponding wall portion 61c, which wall portion constitutes the stepped axial boundary of the corresponding recess 68, and its radial dimension i is determined by the corresponding guide collar. It is below the radial dimension of 38. When the radial width e of the additional disk 61 is larger than the radial distance g from the circumference of the retainer disk 24 to the receiving opening 36, a recess 69 that frees the cross section of the receiving hole 36 in the wall portion 61c in the axial direction. Is also realized. On the additional disk 61 it not only the disk part 61b realizing the radial expansion of the support surface, but also the width k enlarges the radial dimension of the radial support surface of the additional disk 61 and thus for the support part 58a. It is also a circumferential wall 64.

  The support portion 58a can be constituted by a transverse arm of support angle material, the bottom arm 58b of which is the circumference of the retainer disc 24, the additional disc 61 or its circumferential wall 64, or the lock engagement arm 66. It is extended from the rotary swash plate 13 at a position away from it in the radial direction, and is fastened, for example, screwed to it, as shown by a one-dot chain line. For example, in the case of an axial piston device with an induction stroke range that switches from one side to the other, as in the case of alternating pump / motor operation or alternating rotation direction, a support device 62 is also provided on the other half. For simplicity, only FIG. 2 is shown.

  The invention is not limited to the exemplary embodiments shown and described. Instead of using the retainer disk 24 according to the present invention in the axial piston device 1 having a rotary swash plate structure, it is also possible to use it in an axial piston device having a wobble plate structure or a slant shaft structure.

DESCRIPTION OF SYMBOLS 1 Axial piston apparatus 2 Housing 3 Shaft 4 Cylinder cylinder 5, 6 Rolling bearing 7 Ring 8 Housing cover 9 Cylinder bore 10 Piston 11 Spherical head 12 Slide block 13 Rotary swash plate 14 Positioning device 24 Retainer disk 58a Support part 61 Additional disk

Claims (17)

A housing (2) in which a rotating swash plate (13) and a cylinder body (4) are arranged adjacent to each other in the axial direction and mounted so as to be rotatable relative to each other;
A plurality of pistons (10), which are guided in a cylinder bore (9) extending in the axial direction in the cylinder body (4) so as to be movable and indirectly or directly rotating swash plate (13) And a plurality of pistons (10) in supporting contact with the piston (10), the rotating swash plate by a retainer disk (24) disposed between the rotating swash plate (13) and the cylinder body (4). (13) is held so as not to be removed and extends indirectly or directly through the receiving opening (36) into the retainer disk (24), for example by means of a slide block (12). Engaged behind), and
At least one support part (58a) engaged with axial movement play (a) behind a central inclined region of the free side (24b) axially opposite the rotating swash plate (13) of the retainer disk (24) An axial piston device (1) comprising:
An annular additional disk (61) rests on the edge region of the free side (24b) of the retainer disk (24) and is fastened to the retainer disk (24) ;
The axial thickness (c) of the additional disc (61) is dimensioned so as to ensure an axial movement play (a) from the support portion (58a). A characteristic axial piston device. A housing (2) in which a rotating swash plate (13) and a cylinder body (4) are arranged adjacent to each other in the axial direction and mounted so as to be rotatable relative to each other;
A plurality of pistons (10), which are guided in a cylinder bore (9) extending in the axial direction in the cylinder body (4) so as to be movable and indirectly or directly rotating swash plate (13) And a plurality of pistons (10) in supporting contact with the piston (10), the rotating swash plate by a retainer disk (24) disposed between the rotating swash plate (13) and the cylinder body (4). (13) is held so as not to be removed and extends indirectly or directly through the receiving opening (36) into the retainer disk (24), for example by means of a slide block (12). Engaged behind), and
At least one support part (58a) engaged with axial movement play (a) behind a central inclined region of the free side (24b) axially opposite the rotating swash plate (13) of the retainer disk (24) A retainer disk (24) for an axial piston device (1) comprising:
An annular additional disk (61) rests on the edge region of the free side (24b) of the retainer disk (24) and is fastened to the retainer disk (24) ;
The axial thickness (c) of the additional disc (61) is dimensioned so as to ensure an axial movement play (a) from the support portion (58a). Retainer disc features.   3. The axial piston device according to claim 1 or claim 2, wherein the additional disc (61) is glued on the retainer disc (24), is integrally molded or injection molded. Retainer disk as described in 1.   3. The axial piston device according to claim 1 or the retainer disk according to claim 2, wherein the additional disk (61) is detachably fastened to the retainer disk (24). A housing (2) in which a rotating swash plate (13) and a cylinder body (4) are arranged adjacent to each other in the axial direction and mounted so as to be rotatable relative to each other;
A plurality of pistons (10), which are guided in a cylinder bore (9) extending in the axial direction in the cylinder body (4) so as to be movable and indirectly or directly rotating swash plate (13) And a plurality of pistons (10) in supporting contact with the piston (10), the rotating swash plate by a retainer disk (24) disposed between the rotating swash plate (13) and the cylinder body (4). (13) is held so as not to be removed and extends indirectly or directly through the receiving opening (36) into the retainer disk (24), for example by means of a slide block (12). Engaged behind), and
At least one support part (58a) engaged with axial movement play (a) behind a central inclined region of the free side (24b) axially opposite the rotating swash plate (13) of the retainer disk (24) An annular additional disk (61) for an axial piston device (1) comprising:
The annular additional disc (61) has a radial bearing surface (61a) and one or more fastening elements (62a) on one axial side thereof, the fastening elements retaining the additional disc (62) . disk (24), Ri part der of the fastening device (62) for fastening on the side facing the away from the swash plate (13),
The axial thickness (c) of the additional disc (61) is dimensioned so as to ensure an axial movement play (a) from the support portion (58a). An annular additional disc featuring. The fastening element (62a) is constituted by a locking engagement element which is part of a locking engagement device which locks the additional disk (61) by engaging on the retainer disk (24). The axial piston device or the retainer disk according to any one of claims 1 to 4, or the additional disk according to claim 5.   One locking engagement element is constituted by an annular wall (64), which projects axially from the additional disc (61) and above the bearing surface (61a), and the annular wall An annular lock engagement lug (65) or a plurality of lock engagement lugs (65) arranged continuously in the circumferential direction is provided at a position axially separated from the carrying surface (61a). An axial piston device or a retainer disk or an additional disk according to claim 6.   The plurality of lock engagement elements are constituted by a lock engagement arm (66), and the lock engagement arms (66) are arranged to face each other, protrude in the axial direction from the additional disk (61a), and carry 7. An axial piston device or a retainer disk according to claim 6, further comprising a lock engaging lug (65) projecting above the surface (61a) and spaced axially from the carrying surface (61a). Or additional disk.   9. An axial piston device or retainer according to claim 7 or 8, characterized in that the locking engagement lug (65) is arranged inside the annular wall (64) or inside the locking engagement arm (66). Disk or additional disk.   An annular wall (64) or lock engagement arm (66) overlies the retainer disk (24), and a lock engagement lug (65) or a plurality of lock engagement lugs (65) engage on the retainer disk (24). 10. An axial piston device or a retainer disk according to claim 9, characterized in that it is locked by mating and is preferably engaged behind the retainer disk (24).   5. The axial piston according to claim 1, wherein the retainer disk (24) has an annular collar (38) extending on the free side (24b) of the receiving opening (36). Device or retainer disk. 12. The additional disk (61) according to claim 11, characterized in that it has a plurality of disk parts (61b) arranged in a distributed manner on its circumference and projecting radially inward from its inner edge. 10. An axial piston device or a retainer disk according to claim 1 or an additional disk according to any one of claims 5-9 .   13. An axial piston device or a retainer disc or an additional disc according to claim 12, characterized in that the disc portion (61b) closely divides the annular collar (38) in the circumferential direction.   The additional disk (61) has a recess (68) between the disk portions (61b). The recess faces the additional disk (61) on the side facing away from the carrying surface (61a). 14. An axial piston device or a retainer disc or an additional disc according to claim 12 or 13, characterized in that an axial boundary is defined by an arcuate wall portion (61c) on the inner edge of the).   12. The additional disc (61) is made of plastic, preferably a plastic injection-molded part injection molded as a single part, according to any one of claims 1-4, 10 or 11 Axial piston device or retainer disk or additional disk according to any one of claims 5-9 or 12-14.   The surface of the additional disc (61) facing the support portion (58a) of the retainer disc (24) has a surface structured to be suitable for hydrodynamic bearings. The axial piston device or the retainer disk or the additional disk according to any one of -15.   17. An axial piston device or a retainer disc or an additional disc according to claim 16, characterized in that the surface has a lubricant pocket and / or a lubricant groove.

Images