Hydraulic pump

Abstract

The utility model provides a hydraulic pump which comprises a shell and a swash plate, the shell is provided with a mounting cavity, the swash plate is arranged in the mounting cavity, and the swash plate is provided with a first movable part and a second movable part which are arranged at an interval; the first bearing bush and the second bearing bush are arranged on the end face, the side, away from the second bearing bush, of the first bearing bush abuts against the side wall face, the side, away from the first bearing bush, of the second bearing bush abuts against the side wall face, the first movable part is movably arranged on the first bearing bush, and the second movable part is movably arranged on the second bearing bush; a first connecting hole and a second connecting hole are formed in the shell in a spaced mode, a first through hole opposite to the first connecting hole is formed in the first bearing bush, a second through hole opposite to the second connecting hole is formed in the second bearing bush, and the distance between the first through hole and the side wall face is not equal to the distance between the second through hole and the side wall face. By the adoption of the technical scheme, the technical problem that two bearing bushes of a hydraulic pump in the prior art are prone to being installed reversely can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pumps, in particular to a hydraulic pump. Background Art

[0002] Hydraulic pumps in the prior art often achieve displacement changes by changing the inclination angle of the swash plate. The swash plate often needs to rotate and slide on the swash plate seat to change its angle. In order to ensure the smooth rotation of the swash plate, bearings are usually arranged on the swash plate seat corresponding to the movable end of the swash plate to support it. Avoidance gaps are often arranged at both ends of the bearing, and the avoidance gaps at both ends are often arranged asymmetrically.

[0003] Since the movable ends of the swash plate are often arranged in pairs and symmetrically, the bearings are also arranged in pairs and symmetrically. In the prior art, the bearings are often installed on the swash plate seat by screws. However, since the screw holes are often designed in the middle of the bearings, the two symmetrically designed bearings are easily installed upside down, which will cause the avoidance gap to be installed upside down, and then cause the swash plate and the bearings to interfere with each other during the operation of the hydraulic pump, thereby affecting the displacement adjustment of the hydraulic pump. Utility Model Content

[0004] The main purpose of the utility model is to provide a hydraulic pump to solve the technical problem that two bearing bushes of the hydraulic pump in the prior art are easily installed reversely.

[0005] In order to achieve the above object, the utility model provides a hydraulic pump, comprising:

[0006] A housing and a swash plate, wherein the housing has an installation inner wall surface, the installation inner wall surface encloses an installation cavity, the installation inner wall surface includes a side wall surface and an end surface connected to each other, the swash plate is arranged in the installation cavity, and the swash plate has a first movable portion and a second movable portion arranged at intervals;

[0007] The first bearing shell and the second bearing shell are both arranged on the end surface, the first bearing shell and the second bearing shell are arranged opposite to each other, the side of the first bearing shell away from the second bearing shell abuts against the side wall surface, the side of the second bearing shell away from the first bearing shell abuts against the side wall surface, the first movable part is movably arranged on the first bearing shell, and the second movable part is movably arranged on the second bearing shell;

[0008] A first connecting hole and a second connecting hole are arranged at intervals on the shell, a first through hole arranged opposite to the first connecting hole is arranged on the first bearing shell, and a second through hole arranged opposite to the second connecting hole is arranged on the second bearing shell. The spacing between the first through hole and the side wall surface is not equal to the spacing between the second through hole and the side wall surface.

[0009] Furthermore, a first avoidance notch and a second avoidance notch are provided on the first bearing shell, and the first avoidance notch and the second avoidance notch are both located on a side of the first bearing shell away from the side wall surface;

[0010] Wherein, the shape of the first avoidance gap is different from the shape of the second avoidance gap; and / or,

[0011] The size of the first avoidance gap is different from the size of the second avoidance gap.

[0012] Furthermore, a third avoidance notch and a fourth avoidance notch are provided on the second bearing shell, and the third avoidance notch and the fourth avoidance notch are both located on a side of the second bearing shell away from the side wall surface;

[0013] The shape of the third avoidance gap is different from the shape of the fourth avoidance gap; and / or,

[0014] The size of the third avoidance gap is different from the size of the third avoidance gap.

[0015] Further, the shape of the first avoidance gap is the same as the shape of the third avoidance gap; and / or,

[0016] The shape of the second avoidance gap is the same as the shape of the fourth avoidance gap.

[0017] Further, the first avoidance gap is a square gap; and / or,

[0018] The second avoidance gap is a step; and / or,

[0019] The third avoidance gap is a square gap; and / or,

[0020] The fourth avoidance gap is the step entrance.

[0021] Furthermore, a first oil groove is arranged on a side of the first movable portion close to the first bearing shell, and an opening of the first oil groove is arranged opposite to the first bearing shell.

[0022] Furthermore, a second oil groove is arranged on a side of the second movable portion close to the second bearing shell, and an opening of the second oil groove is arranged opposite to the second bearing shell.

[0023] Further, the first oil groove is an arc-shaped groove, the first oil groove is a strip-shaped groove; and / or,

[0024] The first oil groove is an arc-shaped groove, and the second oil groove is a strip-shaped groove.

[0025] Furthermore, the first through hole is a stepped hole structure, and the hydraulic pump further comprises:

[0026] A first locking member, the first locking member comprises a first locking rod and a first abutting boss connected to each other, the first locking rod is inserted into the first connecting hole and is locked and connected to the first connecting hole, and the first abutting boss abuts against a step of the first through hole;

[0027] Wherein, the first abutting boss is located in the first through hole; or,

[0028] The first abutting boss is arranged flush with an end of the first through hole away from the end surface.

[0029] Furthermore, the second through hole is a stepped hole structure, and the hydraulic pump further comprises:

[0030] A second locking member, the second locking member comprises a second locking rod and a second abutting boss connected to each other, the second locking rod is inserted into the second connecting hole and is locked and connected to the second connecting hole, and the second abutting boss abuts against a step of the second through hole;

[0031] Wherein, the second abutting boss is located in the second through hole; or,

[0032] The second abutting boss is arranged flush with an end of the second through hole away from the end surface.

[0033] By applying the technical solution of the utility model, the first connecting hole and the second connecting hole are arranged at intervals on the housing, the first bearing shell is provided with a first through hole arranged opposite to the first connecting hole, and the second bearing shell is provided with a second through hole arranged opposite to the second connecting hole. Since the spacing between the first through hole and the side wall surface and the spacing between the second through hole and the side wall surface are not equal, if the first bearing shell is placed in the installation position of the second bearing shell, the first through hole will be offset from the second connecting hole, and the first bearing shell cannot be installed on the housing at this time; conversely, if the second bearing shell is placed in the installation position of the first bearing shell, the second through hole will be offset from the first connecting hole, and the second bearing shell cannot be installed on the housing at this time, thereby realizing the corresponding relationship between the first through hole and the first connecting hole, and the second through hole and the second connecting hole, and avoiding the situation of installing the two bearing shells upside down. Therefore, the technical solution provided by the utility model can solve the technical problem that the two bearing shells of the hydraulic pump in the prior art are easily installed upside down. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0035] Figure 1 A schematic cross-sectional structure diagram of a hydraulic pump provided according to an embodiment of the utility model is shown;

[0036] Figure 2 A schematic diagram of a first bearing provided according to an embodiment of the utility model at a viewing angle is shown;

[0037] Figure 3 A schematic structural diagram of a first bearing bush provided according to an embodiment of the utility model is shown;

[0038] Figure 4A schematic diagram of a second bearing provided according to an embodiment of the utility model at a viewing angle is shown;

[0039] Figure 5 A schematic structural diagram of a second bearing bush provided according to an embodiment of the utility model is shown;

[0040] Figure 6 A schematic structural diagram of a swash plate provided according to an embodiment of the utility model is shown;

[0041] Figure 7 A schematic diagram of a swash plate provided according to an embodiment of the utility model at a viewing angle is shown;

[0042] Figure 8 A schematic structural diagram of a swash plate placed on a bearing shell according to an embodiment of the utility model is shown at a viewing angle.

[0043] The above drawings include the following reference numerals:

[0044] 10. housing; 11. mounting cavity; 121. side wall surface; 122. end surface; 131. first connecting hole; 132. second connecting hole;

[0045] 20, swash plate; 21, first movable part; 211, first oil groove; 22, second movable part; 221, second oil groove;

[0046] 31. first bearing shell; 311. first through hole; 312. first avoidance notch; 313. second avoidance notch;

[0047] 32, second bearing shell; 321, second through hole; 322, third avoidance notch; 323, fourth avoidance notch;

[0048] 41. first locking member; 411. first locking rod; 412. first abutting boss;

[0049] 42. Second locking member; 421. Second locking rod; 422. Second abutting boss. DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0051] Please refer to Figures 1 to 8One embodiment of the utility model provides a hydraulic pump, which includes a housing 10, a swash plate 20, a first bearing 31 and a second bearing 32. The housing 10 has an installation inner wall surface, and the installation inner wall surface includes a side wall surface 121 and an end surface 122 connected to each other. The swash plate 20 is arranged in an installation cavity 11 surrounded by the installation inner wall surface. The swash plate 20 has a first movable portion 21 and a second movable portion 22 arranged at intervals. The first bearing 31 and the second bearing 32 arranged opposite to each other are both arranged on the end surface 122. The side of the first bearing 31 away from the second bearing 32 abuts against the side wall surface 121, and the side of the second bearing 32 away from the first bearing 31 abuts against the side wall surface 121. The first movable portion 21 is movably arranged on the first bearing 31, and the second movable portion 22 is movably arranged on the second bearing 32. A first connecting hole 131 and a second connecting hole 132 are arranged at intervals on the shell 10, a first through hole 311 arranged opposite to the first connecting hole 131 is arranged on the first bearing shell 31, and a second through hole 321 arranged opposite to the second connecting hole 132 is arranged on the second bearing shell 32, and the spacing between the first through hole 311 and the side wall surface 121 is not equal to the spacing between the second through hole 321 and the side wall surface 121.

[0052] By adopting the technical solution provided in this embodiment, the first connecting hole 131 and the second connecting hole 132 are arranged at intervals on the shell 10, the first bearing shell 31 is provided with a first through hole 311 arranged opposite to the first connecting hole 131, and the second bearing shell 32 is provided with a second through hole 321 arranged opposite to the second connecting hole 132. Since the spacing between the first through hole 311 and the side wall surface 121, and the spacing between the second through hole 321 and the side wall surface 121 are not equal, if the first bearing shell 31 is placed at the installation position of the second bearing shell 32, the first through hole 311 will be offset from the second connecting hole 132, and the first bearing shell 31 cannot be installed on the housing 10 at this time; conversely, if the second bearing shell 32 is placed at the installation position of the first bearing shell 31, the second through hole 321 will be offset from the first connecting hole 131, and the second bearing shell 32 cannot be installed on the housing 10 at this time, thereby realizing the corresponding relationship between the first through hole 311 and the first connecting hole 131, and the second through hole 321 and the second connecting hole 132, thereby avoiding the situation of installing the two bearing shells upside down.

[0053] Specifically, a rocking seat surface is provided on the housing 10 , and the first bearing bush 31 and the second bearing bush 32 are both provided on the rocking seat surface.

[0054] Specifically, Figure 2 and Figure 4As shown, the spacing between the first through hole 311 and the side of the first bearing 31 abutting against the side wall surface 121 is B, and the distance to the other side is A. The spacing between the second through hole 321 and the side wall surface 121 of the second bearing 32 abutting against the side wall surface 121 is C, and the distance to the other side is D. As long as B≠C is ensured, the correspondence between the first through hole 311 and the first connecting hole 131, and the second through hole 321 and the second connecting hole 132 can be achieved, and the situation of installing the two bearings upside down can be avoided. Furthermore, A, B, C, and D can also be unequal to each other, which can also avoid the situation of installing the two bearings upside down.

[0055] In this embodiment, the first bearing 31 is provided with a first avoidance notch 312 and a second avoidance notch 313, and both the first avoidance notch 312 and the second avoidance notch 313 are located on the side of the first bearing 31 away from the side wall surface 121. In this way, the first bearing 31 can avoid other structures through the first avoidance notch 312 and the second avoidance notch 313, thereby preventing the setting of the first bearing 31 from interfering with the operation of other structures.

[0056] Specifically, the shape of the first avoidance notch 312 is different from the shape of the second avoidance notch 313. In this way, the first bearing 31 can set the shapes of the first avoidance notch 312 and the second avoidance notch 313 according to the shape of the structure to be avoided, thereby achieving the avoidance requirement of the first bearing 31 while ensuring the structural strength of the first bearing 31.

[0057] Specifically, the size of the first avoidance notch 312 is different from the size of the second avoidance notch 313. In this way, the first bearing 31 can set the sizes of the first avoidance notch 312 and the second avoidance notch 313 according to the size of the structure to be avoided, so as to ensure the integrity of the first bearing 31 while achieving the avoidance requirement of the first bearing 31, so as to ensure the structural strength of the first bearing 31.

[0058] In this embodiment, the second bearing 32 is provided with a third avoidance notch 322 and a fourth avoidance notch 323, and the third avoidance notch 322 and the fourth avoidance notch 323 are both located on the side of the second bearing 32 away from the side wall surface 121. In this way, the second bearing 32 can avoid other structures through the third avoidance notch 322 and the fourth avoidance notch 323, thereby preventing the second bearing 32 from interfering with the operation of other structures.

[0059] Specifically, the shape of the third avoidance notch 322 is different from the shape of the fourth avoidance notch 323. In this way, the second bearing 32 can set the shapes of the third avoidance notch 322 and the fourth avoidance notch 323 according to the shape of the structure to be avoided, thereby achieving the avoidance requirement of the second bearing 32 while ensuring the structural strength of the second bearing 32.

[0060] Specifically, the size of the third avoidance notch 322 is different from the size of the fourth avoidance notch 323. In this way, the second bearing 32 can set the sizes of the third avoidance notch 322 and the fourth avoidance notch 323 according to the size of the structure to be avoided, so as to ensure the integrity of the second bearing 32 while achieving the avoidance requirement of the second bearing 32, so as to ensure the structural strength of the second bearing 32.

[0061] In this embodiment, the shape of the first avoidance notch 312 is the same as the shape of the third avoidance notch 322. In this way, the corresponding positions of the first bearing bush 31 and the second bearing bush 32 adopt the same structure, ensuring the consistency of the structural strength of the first bearing bush 31 and the second bearing bush 32.

[0062] In this embodiment, the shape of the second avoidance notch 313 is the same as the shape of the fourth avoidance notch 323. In this way, the first bearing bush 31 and the second bearing bush 32 have the same structure at the corresponding positions, ensuring the consistency of the structural strength of the first bearing bush 31 and the second bearing bush 32.

[0063] Specifically, the first avoidance notch 312 is a square notch, and the second avoidance notch 313 is a step notch. In this way, the first bearing 31 can set the first avoidance notch 312 as a square notch and the second avoidance notch 313 as a step notch according to the shape of the structure to be avoided, so as to avoid different structures.

[0064] Specifically, the third avoidance notch 322 is a square notch, and the fourth avoidance notch 323 is a step notch. In this way, the second bearing 32 can set the third avoidance notch 322 as a square notch and the fourth avoidance notch 323 as a step notch according to the shape of the structure to be avoided, so as to avoid different structures.

[0065] Specifically, the step opening is a step-shaped gap formed by the zigzag structure of the bearing shell edge.

[0066] In this embodiment, a first oil groove 211 is provided on one side of the first movable part 21 close to the first bearing bush 31, and the opening of the first oil groove 211 is arranged opposite to the first bearing bush 31. In this way, when the first movable part 21 moves on the first bearing bush 31, the oil stored in the first oil groove 211 can lubricate the movement of the first movable part 21, thereby improving the smoothness of the movement of the first movable part 21, reducing the wear of the first movable part 21 and the first bearing bush 31, and improving the service life of the first bearing bush 31 and the swash plate 20. In addition, the first bearing bush 31 can seal the first oil groove 211 to avoid leakage of the stored oil, thereby ensuring the lubrication effect brought by the first oil groove 211.

[0067] In this embodiment, a second oil groove 221 is provided on one side of the second movable part 22 close to the second bearing bush 32, and the opening of the second oil groove 221 is arranged opposite to the second bearing bush 32. In this way, when the second movable part 22 moves on the second bearing bush 32, the oil stored in the second oil groove 221 can lubricate the movement of the second movable part 22, thereby improving the smoothness of the movement of the second movable part 22, reducing the wear of the second movable part 22 and the second bearing bush 32, and improving the service life of the first bearing bush 31 and the swash plate 20. In addition, the second bearing bush 32 can seal the second oil groove 221 to avoid leakage of the stored oil, thereby ensuring the lubrication effect brought by the second oil groove 221.

[0068] In this embodiment, the first oil groove 211 is an arc groove, and the first oil groove 211 is a strip groove. In this way, the shape of the first oil groove 211 is compatible with the first bearing 31, thereby ensuring the sealing effect of the first bearing 31 on the first oil groove 211, and further ensuring the lubrication effect brought by the first oil groove 211.

[0069] In this embodiment, the second oil groove 221 is an arc groove, and the second oil groove 221 is a strip groove. In this way, the shape of the second oil groove 221 is adapted to the second bearing bush 32, thereby ensuring the sealing effect of the second bearing bush 32 on the second oil groove 221, and further ensuring the lubrication effect brought by the second oil groove 221.

[0070] Specifically, the extending direction of the strip groove is consistent with the extending direction of the corresponding bearing bush arc line.

[0071] In this embodiment, the first through hole 311 is a stepped hole structure, and the hydraulic pump further includes a first locking member 41, which includes a first locking rod 411 and a first abutting boss 412 connected to each other. The first locking rod 411 is inserted into the first connecting hole 131 and is locked and connected to the first connecting hole 131, and the first abutting boss 412 abuts against the step of the first through hole 311. In this way, the first locking rod 411 enters the first through hole 311 and the first connecting hole 131 in sequence. As the distance of the first locking rod 411 entering the first connecting hole 131 increases, the first abutting boss 412 of the first locking rod 411 gradually approaches the first through hole 311. Finally, the first abutting boss 412 abuts against the step of the first through hole 311, thereby realizing the connection of the first bearing 31, and the structure is simple and the connection is stable.

[0072] Specifically, the first locking rod 411 is threadedly locked to the first connecting hole 131 .

[0073] Specifically, the first abutting boss 412 may be located in the first through hole 311, or the first abutting boss 412 may be arranged flush with the end of the first through hole 311 away from the end surface 122. In this way, the first abutting boss 412 can be prevented from interfering with the movement of the first movable part 21, thereby ensuring the smooth movement of the first movable part 21.

[0074] In this embodiment, the second through hole 321 is a stepped hole structure, and the hydraulic pump further includes a second locking member 42, which includes a second locking rod 421 and a second abutting boss 422 connected to each other. The second locking rod 421 is inserted into the second connecting hole 132 and is locked and connected with the second connecting hole 132, and the second abutting boss 422 abuts against the step of the second through hole 321. In this way, the second locking rod 421 enters the second through hole 321 and the second connecting hole 132 in sequence. As the distance of the second locking rod 421 entering the second connecting hole 132 increases, the second locking rod 421 moves to the second abutting boss 422 and gradually approaches the second through hole 321. Finally, the second abutting boss 422 abuts against the step of the first through hole 311, thereby realizing the connection of the second bearing 32, and the structure is simple and the connection is stable.

[0075] Specifically, the second locking rod 421 is threadedly locked to the second connecting hole 132 .

[0076] Specifically, the second abutting boss 422 is located in the second through hole 321, or the second abutting boss 422 is flush with the end of the second through hole 321 away from the end surface 122. In this way, the second abutting boss 422 can be prevented from interfering with the movement of the second movable part 22, thereby ensuring the smooth movement of the second movable part 22.

[0077] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects: through the correspondence between the first through hole 311 and the first connecting hole 131, and the second through hole 321 and the second connecting hole 132, the situation of installing the two bearings upside down can be avoided during installation.

[0078] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0079] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0080] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0081] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0082] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0083] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A hydraulic pump, characterized in that: include: A housing (10) and a swash plate (20), wherein the housing (10) has an installation inner wall surface, the installation inner wall surface encloses an installation cavity (11), the installation inner wall surface comprises a side wall surface (121) and an end surface (122) connected to each other, the swash plate (20) is arranged in the installation cavity (11), and the swash plate (20) has a first movable portion (21) and a second movable portion (22) arranged at an interval; The first bearing (31) and the second bearing (32) are both arranged on the end surface (122); the first bearing (31) and the second bearing (32) are arranged opposite to each other; the side of the first bearing (31) away from the second bearing (32) abuts against the side wall surface (121); the side of the second bearing (32) away from the first bearing (31) abuts against the side wall surface (121); the first movable portion (21) is movably arranged on the first bearing (31); and the second movable portion (22) is movably arranged on the second bearing (32); A first connecting hole (131) and a second connecting hole (132) are arranged at intervals on the shell (10); a first through hole (311) arranged opposite to the first connecting hole (131) is arranged on the first bearing shell (31); a second through hole (321) arranged opposite to the second connecting hole (132) is arranged on the second bearing shell (32); and a spacing between the first through hole (311) and the side wall surface (121) is not equal to a spacing between the second through hole (321) and the side wall surface (121).

2. The hydraulic pump according to claim 1, characterized in that: The first bearing shell (31) is provided with a first avoidance notch (312) and a second avoidance notch (313), and the first avoidance notch (312) and the second avoidance notch (313) are both located on a side of the first bearing shell (31) away from the side wall surface (121); Wherein, the shape of the first avoidance gap (312) is different from the shape of the second avoidance gap (313); and / or, The size of the first avoidance gap (312) is different from the size of the second avoidance gap (313).

3. The hydraulic pump according to claim 2, characterized in that: The second bearing shell (32) is provided with a third avoidance notch (322) and a fourth avoidance notch (323), and the third avoidance notch (322) and the fourth avoidance notch (323) are both located on a side of the second bearing shell (32) away from the side wall surface (121); Wherein, the shape of the third avoidance gap (322) is different from the shape of the fourth avoidance gap (323); and / or, The size of the third avoidance gap (322) is different from the size of the third avoidance gap (322).

4. The hydraulic pump according to claim 3, characterized in that: The shape of the first avoidance gap (312) is the same as the shape of the third avoidance gap (322); and / or, The shape of the second avoidance gap (313) is the same as the shape of the fourth avoidance gap (323).

5. The hydraulic pump according to claim 3, characterized in that: The first avoidance gap (312) is a square gap; and / or, The second avoidance gap (313) is a step opening; and / or, The third avoidance gap (322) is a square gap; and / or, The fourth avoidance gap (323) is a step opening.

6. The hydraulic pump according to claim 1, characterized in that: A first oil groove (211) is arranged on one side of the first movable portion (21) close to the first bearing bush (31), and an opening of the first oil groove (211) is arranged opposite to the first bearing bush (31).

7. The hydraulic pump according to claim 6, characterized in that: A second oil groove (221) is arranged on one side of the second movable portion (22) close to the second bearing bush (32), and an opening of the second oil groove (221) is arranged opposite to the second bearing bush (32).

8. The hydraulic pump according to claim 7, characterized in that: The first oil groove (211) is an arc-shaped groove, the first oil groove (211) is a strip-shaped groove; and / or, The second oil groove (221) is an arc-shaped groove, and the second oil groove (221) is a strip-shaped groove.

9. The hydraulic pump according to claim 1, characterized in that: The first through hole (311) is a stepped hole structure, and the hydraulic pump further comprises: A first locking member (41), the first locking member (41) comprising a first locking rod (411) and a first abutting boss (412) connected to each other, the first locking rod (411) being inserted into the first connecting hole (131) and being locked and connected to the first connecting hole (131), and the first abutting boss (412) abutting against a step of the first through hole (311); Wherein, the first abutting boss (412) is located in the first through hole (311); or, The first abutment boss (412) is arranged flush with an end of the first through hole (311) away from the end surface (122).

10. The hydraulic pump according to claim 1, characterized in that The second through hole (321) is a stepped hole structure, and the hydraulic pump further comprises: A second locking member (42), the second locking member (42) comprising a second locking rod (421) and a second abutting boss (422) connected to each other, the second locking rod (421) being inserted into the second connecting hole (132) and being locked and connected to the second connecting hole (132), and the second abutting boss (422) abutting against a step of the second through hole (321); Wherein, the second abutting boss (422) is located in the second through hole (321); or, The second abutment boss (422) is arranged flush with an end of the second through hole (321) away from the end surface (122).

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