Pivoting support bearing and method for producing a synchronizing device for a pivoting support bearing

Abstract

The invention relates to a pivot support bearing (1) for an axial piston machine, comprising a curved cage segment (2) in which rolling bodies are guided, the rolling bodies being arranged between two bearing parts which can be pivoted relative to one another, wherein a synchronization device (4) designed to synchronize the relative movement of the bearing parts with the displacement of the cage segment (2) comprises a pivot rod (5) mounted in the cage segment (2). An articulated bearing (6) is provided for mounting the pivot rod (5) in the cage segment (2), the articulated bearing having an asymmetrical design with respect to a tangential plane (TE) located centrally between the inner circumferential surface and the outer circumferential surface of the cage segment (2).

Description

Technical Field

[0001] The invention relates to a pivot support bearing suitable for use in an axial piston machine according to the preamble of claim 1. The invention also relates to a method for producing a synchronizing device for a pivot support bearing, wherein the synchronizing device synchronizes a movement of a cage of the pivot support bearing that guides rolling elements, in particular rollers, with a pivoting movement of the pivot support. Background Art

[0002] For example, a pivot support bearing of the type in question for a hydraulic axial piston machine is known from DE 25 21 312 B1. The inclined plate, i.e. the pivot support, can be mounted in a housing in a variable angular position by means of a known pivot support bearing. By adjusting the angular position of the inclined plate, the stroke of the piston of the axial piston machine changes. The known inclined plate type pivot bearing comprises rollers as rolling bodies which are guided in a cage. A rod is pivotably hinged on the cage, which extends approximately radially to the curved part of the arched cage, and in the case of DE 25 21 312 B1, the rod can additionally be displaced radially relative to the cage. The rod is pivotably mounted at one end of the rod at a point on the housing in a fixed manner and is arranged with the other end of the rod to be able to pivot on the inclined plate and to be able to be displaced in the longitudinal direction of the inclined plate. Therefore, each pivoting of the inclined plate is associated with a displacement of the cage, which generally provides a synchronization device.

[0003] Another axial piston machine with a pivot bearing is described in DE 10 2006 023 711 A1. In this case, the cage segment is guided by an angular guide element which is mounted on the cage segment in a rotatable and displaceable manner and has two guide legs which are attached in different ways to parts which can pivot relative to each other.

[0004] DE 34 42 391 C1 discloses another tracking device for a cage of a segmented rolling bearing, ie a pivoting bearing of a support. The tracking device comprises two guide grooves, in the intersection of which a guide member is guided.

[0005] Documents DE 10 2009 013 094 B4 and DE 10 2012 202 742 B3 also describe a wedge-type pivot bearing with a shifting link for synchronizing the movement of the cage with the pivoting movement of the bearing part.

[0006] Various design options for cages for pivot bracket bearings can be found in documents DE 87 05 446 U1, DE 10 2005 034 739 A1 and DE 10 2014 206 803 B3.

[0007] DE 10 2017 126 525 A1 describes a pivoting support bearing in which the movement of the cage is limited by a stop.

[0008] Complete axial piston machines including a pivot support bearing are described, for example, in documents DE 199 60 941 A1 and DE 10 2013 210 070 B3. Summary of the invention

[0009] The object of the invention is to further develop a pivoting support bearing with a synchronization device which, in contrast to the mentioned prior art, synchronizes the relative movement of two mounted parts that can pivot relative to each other with the movement of the cage segment, in particular with regard to production aspects.

[0010] According to the invention, this object is achieved by a pivot support bearing having the features of claim 1. This object is also achieved by a method for producing a synchronization device according to claim 7. The embodiments and advantages of the invention explained below in conjunction with the production method also apply mutatis mutandis to the device, i.e. the pivot support bearing, and vice versa.

[0011] In a basic concept known per se, a pivot support bearing comprises a curved cage section in which rolling bodies, in particular cylindrical rollers, which roll between two bearing parts that can pivot relative to one another are guided, wherein a synchronization device designed to synchronize the relative movement of the bearing parts with the displacement of the cage section comprises a pivot lever mounted in the cage section.

[0012] According to the invention, an articulated bearing for mounting a pivot lever in a cage segment is provided, which articulated bearing has an asymmetrical design relative to a tangential plane located centrally between the inner circumferential surface and the outer circumferential surface of the cage.

[0013] The pivot lever protrudes from the pivot bearing on both sides. In this respect, there are commonalities between the mounting of the pivot lever and the mounting of the ball sleeve joint known from DE 10 2009 027 204 A1. However, compared to the mounting of the pivot lever, the ball sleeve joint has a mirror-symmetrical design with respect to a central plane intersecting the ball sleeve.

[0014] It has been shown that the asymmetrical design of the articulated bearing of the pivot support bearing offers an advantageous possibility in terms of production to form the bearing outer part in one piece by means of the cage segment.

[0015] The tangent plane intersects the articulated bearing in the center, i.e. at the pivot point. Unless otherwise stated, the geometrical data about the articulated bearing relate to the normal position of the pivot lever. In the normal position, the pivot lever is oriented in the radial direction of the pivot support bearing and therefore intersects the pivot axis of the pivot support bearing. The straight line defined by the pivot lever and oriented in the radial direction of the pivot support bearing represents the surface normal of the tangent plane.

[0016] According to various possible embodiments, the inner plain bearing part formed by the pivot lever is symmetrical compared to the outer plain bearing part formed by the cage segment.

[0017] Symmetrical is to be understood here as mirror symmetry with respect to a tangential plane. The inner plain bearing part usually has a spherical shape. In a preferred embodiment, no displaceability of the pivot lever relative to the cage section in the radial direction, ie in the longitudinal direction of the pivot lever, is provided.

[0018] According to a first possible design, an annular recess is formed on the outer circumferential surface of the cage segment around the articulated bearing and is arranged outside an annular fixing collar formed directly by the cage segment and the annular fixing collar holds the pivot lever in a captive manner in the cage segment together with the spherical plain bearing surface provided by the cage segment. The outer plain bearing piece is preferably formed in one piece directly by means of the cage segment.

[0019] The shaping of bearing components of a ball and socket joint is known in principle, for example, from documents WO 2004 / 020847 A1 and DE 20 2007 000 609 U1, wherein these known ball and socket joints are designed as symmetrical joints.

[0020] Reference is also made to document WO 2007 / 115516 A1, in which the use of a cold forming process for producing a radial joint is described.A ball stud as a component of the radial joint protrudes from the housing on one side.

[0021] According to a second possible design, the pivot lever in the articulated bearing is secured against being pulled out by a securing ring held in the cage section.

[0022] In this context, reference is made to WO 2011 / 032616 A1 which describes a joint with a spherical head fastened to a pin, a ring nut being provided for supporting the bearing shell.

[0023] In both designs, the cage segments are preferably made of plastic. The cage segments can also be made of metal. In both the case of cage segments made of plastic and cage segments made of metal, the cage segments are preferably a one-piece component, wherein the outer parts of the articulated bearing are formed directly by means of this component. In both cases, the pivot lever is preferably a metal part.

[0024] The synchronizing device of the pivot bracket bearing can be produced according to the following steps:

[0025] - providing a cage segment blank, in which a through-hole having a cylindrical portion and a tapered portion adjoining the cylindrical portion is arranged,

[0026] - providing a pivoting lever having a spherical thickening spaced apart from an end of the pivoting lever,

[0027] - inserting the pivot lever into the through-hole of the cage segment blank so that the spherical thickening rests on the tapered portion of the through-hole,

[0028] - narrowing the cylindrical portion of the through hole, by which the pivoting lever is secured against being pulled out of the through hole.

[0029] In a first embodiment, for example, the local area of ​​the cylindrical portion of the through-opening is narrowed by heating and deforming the cage segment blank. Depending on the material, cold forming of the cage segment blank is also conceivable.

[0030] Independently of the temperature at which the deformation is carried out, the deformation of the cage segment blank is carried out, for example, by placing a punch having an annular punch surface on the outer circumferential surface of the cage segment blank.

[0031] If the articulated bearing corresponds to the second design, then in the preferred method, it is not necessary to deform the cage segment blank. Instead, in this case, the cylindrical portion is narrowed by inserting a securing ring into the cage segment blank.

[0032] In both designs of the pivot support bearing, the articulated bearing generally has different mechanical load capacities in two axial directions relative to the longitudinal direction of the pivot lever. Therefore, the articulated bearing can be particularly well adapted to the actual load conditions in axial piston machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Two exemplary embodiments of the invention are explained in more detail below with the aid of the accompanying drawings. In the drawings:

[0034] Figure 1 shows components of a first exemplary embodiment of a pivot support bearing,

[0035] Figure 2 Shown according to Figure 1 A cross-sectional perspective view of the cage of the pivot bracket bearing,

[0036] Figures 3 to 6 shows the use for production according to Figure 1 The assembly steps of the arrangement structure,

[0037] Figure 7 shows details of a second exemplary embodiment of a pivot support bearing,

[0038] Figure 8 Shown according to Figure 7 The fixed ring of the arrangement structure,

[0039] Fig. 9 shows the use for production according to Figure 7 The assembly steps of the arrangement structure. DETAILED DESCRIPTION

[0040] Unless otherwise stated, the following explanations relate to two exemplary embodiments.

[0041] In all the figures, parts which correspond to one another or have substantially the same function are denoted by the same reference numerals.

[0042] The pivot support bearing 1, which is only partially shown, comprises a bent cage section 2 in which rolling elements (not shown), i.e. cylindrical rollers, are guided in cage pockets 3. In the fully assembled state of the pivot support bearing 1, the rolling elements are in contact with the pivot support and the housing as bearing parts that can be pivoted relative to one another. The pivot support bearing 1 is part of an axial piston machine (not shown further), i.e. an axial piston pump or an axial piston motor. The volume flow through the axial piston machine can be influenced by means of the pivot support bearing 1. With regard to the basic design and function of the pivot support bearing 1, reference is made to the prior art cited at the beginning.

[0043] The pivoting support bearing 1 is assigned a synchronization device, which is generally designated as 4, which ensures that the pivoting of the cage segment 2 is coordinated with the relative movement between the bearing parts that can be adjusted relative to each other. The synchronization device 4 comprises a pivot lever 5 installed in the cage segment 2. Here, an articulated bearing 6 is formed by the pivot lever 5 and the cage segment 2. The articulated bearing 6 is formed by an inner plain bearing part 7, which is provided directly by the pivot lever 5, and an outer plain bearing part 8, which is provided by a support plate 9 of the cage segment 2. The support plate 9 is slightly curved according to the curvature of the cage segment 2 and merges into a cage band 10. The cage band 10 is connected to a further cage band 11 via webs 12, wherein a cage pocket 3 is formed between two webs 12 adjacent in the circumferential direction. The webs 12 are oriented parallel to the pivot axis of the pivoting support bearing 1.

[0044] The inner plain bearing part 7 formed by the pivot lever 5 is also referred to as a joint ball. Furthermore, the pivot lever 5 has an end ball 13, 14 at each of its two ends. The joint ball 13 which is arranged radially inside the cage segment 2, i.e. the end ball 13 which is spaced less than the cage segment 2 from the pivot axis of the pivot support bearing 1, has a smaller distance from the joint ball 7 than the outer end ball 14. This is equivalent to the outer arm 15 of the pivot lever 5 being longer than the inner arm 16. The length of the arms 15, 16 is measured in each case starting from the center point of the articulated bearing 6. The center point of the articulated bearing 6 is located in a tangential plane TE which is located centrally between the inner surface and the outer surface of the support plate 9.

[0045] The inner plain bearing part 7 has a spherical shape surface and is designed mirror-symmetrically with respect to the tangential plane TE. The inner plain bearing part 7 is inserted into a through-opening 28 in the support plate 9.

[0046] Compared to the inner plain bearing part 7, the outer plain bearing part 8 provided by the cage segment 2 has an asymmetrical design with respect to the tangential plane TE. The inner part 17 of the through-opening 28 extends radially inwards from the tangential plane TE, i.e. in the direction of the pivot axis of the pivot support bearing 1. The radius of curvature of the inner part 17 corresponds to the radius of the engagement ball 7. The articulation bearing 6 is therefore designed to withstand forces which load the pivot lever 5 radially inwards in the longitudinal direction of the articulation bearing. The inner part 17 of the through-opening 28 constitutes a spherical plain bearing surface.

[0047] Furthermore, the articulation bearing 6 can also prevent the pivot lever 5 from being pulled outwards from the cage segment 2 by absorbing relatively small forces in this direction. In both exemplary embodiments, the pivot lever 5 is secured against being pulled outwards from the cage segment 2, as explained in more detail below.

[0048] In accordance with Figure 1 In the manufacture of the synchronization device 4, Figure 2 The cage segment blank 18 shown in FIG. 1 is hypothetical. The shape of the cage segment blank 18 corresponds to the shape of the final cage segment 2, except for the outer plain bearing part 8. The inner part 17 of the through-opening 28 also has its final shape.

[0049] During the manufacture of the synchronizing device 4, the pivot lever 5 is inserted from the outside into the outer sliding bearing part 8 in order to produce Figure 3The through-opening 28 adjoins the outer part 19 of the inner part 17 radially on the outside - with respect to the pivot axis - i.e. the area of ​​the inner surface of the outer plain bearing part 8 lying outside the tangential plane TE, in the shape of a cylinder with a circular cross section, wherein the diameter of the outer, cylindrical part 19 corresponds to the diameter of the engagement ball 7.

[0050] After the pivot lever 5 has been inserted into the outer sliding bearing part 8, the support plate 9 is deformed by means of a tool 20, which can be Figure 4 and Figure 5 . For the purpose of deformation, the support plate 9 is temporarily heated. A tool 20 designed as a punch with a hollow cylindrical shape is placed concentrically on the articulated bearing 6 relative to the external sliding bearing piece 8 and the pivot lever 5, wherein an annular machined edge 21 forming the end face of the tool 20 is pressed into the surface of the support plate 9. An annular recess 22 is thus formed on the outer surface of the support plate 9, wherein an annular fixing collar 23 is simultaneously formed by material displacement, with the aid of which the outer part 19 is tapered, so that the pivot lever 5 is fixed against being pulled outwards from the cage segment 2 and, at the same time, a sliding bearing between the engagement ball 7 and the external sliding bearing piece 8 is arranged in the corresponding direction. In accordance with Figure 1 In the exemplary embodiment of , non-destructive disassembly of the articulated bearing 6 is not possible.

[0051] In accordance with Figure 7 In the exemplary embodiment of the embodiment of the invention, the outer, cylindrical portion 19 of the outer plain bearing part 8 has an annular groove 24. In this case, no deformation of the cage segment blank 18 is provided. Instead, after the pivot lever 5 has been inserted into the outer plain bearing part 8, Figure 8 The fixing ring 25 shown separately in the figure is inserted into the annular groove 24. The non-closed fixing ring 25 has openings 26 at its two ends facing each other, which enable a tool to be used to compress the fixing ring 25. With the same tool (not shown), the articulated bearing 6 can also be disassembled. In addition, the fixing ring 25 realizes a function corresponding to the fixing collar 23. In order to be consistent with the shape of the joint ball 7, the fixing ring 25 has a bevel 27 on its inner circumferential surface.

[0052] Reference numerals list

[0053] 1 pivot bracket bearing 2 cage segment 3 cage pocket 4 synchronization device 5 pivot lever 6 articulated bearing 7 inner plain bearing part, joint ball 8 outer plain bearing part 9 support plate 10 cage band 11 cage band 12 web 13 inner end ball 14 outer end ball 15 outer arm 16 inner arm 17 inner part of the through-opening 18 cage segment blank 19 outer part of the through-opening 20 tool, punch 21 machining edge 22 annular recess 23 fixing collar 24 annular groove 25 fixing ring 26 opening 27 inclined surface 28 through-opening TE tangent plane

Claims

1. A pivot support bearing (1) having a bent cage section (2) in which rolling bodies are guided, the rolling bodies rolling between two bearing parts which are pivotable relative to one another, wherein: A synchronizing device (4) designed to synchronize the relative movement of the bearing parts with the displacement of the cage segment (2) comprises a pivot rod (5) mounted in the cage segment (2), characterized in that an articulated bearing (6) is provided for mounting the pivot rod (5) in the cage segment (2), the articulated bearing having an asymmetrical design with respect to a tangential plane (TE) centrally located between an inner circumferential surface and an outer circumferential surface of the cage segment (2), the inner sliding bearing part (7) formed by the pivot rod (5) being symmetrical compared to an outer sliding bearing part (8) formed by the cage segment (2), an annular recess (22) being formed on the outer circumferential surface of the cage segment (2) surrounding the articulated bearing (6), and the annular recess being arranged on an annular fixing collar (23) formed directly by the cage segment (2). On the outside, the annular recess (22) and the annular fixing collar (23) are both formed by material displacement, which, together with the spherical sliding bearing surface (17) provided by the cage segment (2), holds the pivot lever (5) in a captive manner in the cage segment (2).

2. The pivot support bearing (1) according to claim 1, characterized in that: The outer plain bearing part (8) is formed in one piece directly by means of the cage segment (2).

3. The pivot support bearing (1) according to one of claims 1 to 2, characterized in that The cage segment (2) is made of plastic.

4. A method for producing a synchronizing device (4) for a pivot support bearing (1), the method comprising the following steps: - providing a cage segment blank (18), in which a through opening (28) having a cylindrical portion (19) and a tapered portion adjoining the cylindrical portion (19) is arranged, - providing a pivoting lever (5) having a spherical thickening as an inner sliding bearing member spaced apart from the end of the pivoting lever, - inserting the pivot lever (5) into the through-opening (28) of the cage segment blank (18) such that the spherical thickening rests on the tapered portion of the through-opening (28), - The pivot lever (5) is secured against being pulled out of the through-opening (28) by narrowing the cylindrical portion (19) of the through-opening (28) by heating and deforming the cage segment blank (18).

5. The method according to claim 4, characterized in that The cage segment blank (18) is deformed by placing a punch (20) having an annular machining edge (21) on the outer circumferential surface of the cage segment blank (18).

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