Swashplate piston pump

Abstract

This application discloses a swashplate piston pump, belonging to the field of hydraulic power equipment technology. The swashplate piston pump includes: a housing with a cavity and a first shaft hole; an end cap covering the housing and having a second shaft hole; a main shaft extending into the cavity and rotatably mounted on the housing and end cap via the first and second shaft holes; a distributor plate sleeved on the main shaft and rotatably mounted relative to it; a swashplate sleeved on the main shaft and rotatably mounted relative to it; and a bearing bush disposed between the inner wall of the housing and the swashplate. The swashplate is configured to slide relative to the bearing bush to adjust its tilt relative to the main shaft. The swashplate piston pump also includes a first vibration damping mechanism and a second vibration damping mechanism. The first vibration damping mechanism is disposed between the distributor plate and the inner wall of the end cap, and the second vibration damping mechanism is disposed between the inner wall of the housing and the bearing bush. Applying this application can reduce the transmission of vibration from the distributor plate and swashplate to the end cap and housing, thereby reducing noise.

Description

Technical Field

[0001] This application relates to the field of hydraulic equipment technology, specifically to a swashplate piston pump. Background Technology

[0002] A swashplate piston pump is a commonly used hydraulic power device. It generally includes a housing, main shaft, cylinder block, distributor plate, swashplate, and piston. The cylinder block, distributor plate, and swashplate are all fitted onto the outside of the main shaft. The cylinder block is fixed to the main shaft and can rotate with it. The distributor plate and swashplate are rotatable relative to the main shaft. The piston is located on the side of the cylinder block facing the swashplate, which is tilted relative to the cylinder block. When the main shaft rotates, the piston rotates synchronously with the cylinder block under the drive of the main shaft. Simultaneously, under the limiting and squeezing action of the swashplate, the piston reciprocates linearly along the axial direction relative to the piston mounting hole on the cylinder block, achieving oil suction and pressure.

[0003] With the development of intelligent engineering machinery, higher requirements have been placed on the vibration and noise control of swashplate piston pumps. However, in related technologies, the vibration excitation inside such swashplate piston pumps is transmitted to the outer casing through components such as the distribution plate and swashplate, thus generating noise problems. Summary of the Invention

[0004] This application aims to address one of the technical problems in the related art to a certain extent. To this end, this application provides a swashplate piston pump.

[0005] To achieve the above objectives, this application adopts the following technical solution: a swashplate piston pump, comprising:

[0006] The housing has a cavity and a first shaft hole;

[0007] An end cap is provided on the housing and has a second shaft hole;

[0008] The main shaft extends from the outside into the cavity and is rotatably mounted on the housing and end cap through the first shaft hole and the second shaft hole;

[0009] A distribution plate is located inside the cavity and sleeved outside the main shaft, and is rotatably disposed relative to the main shaft;

[0010] A swashplate, located within the cavity and sleeved around the main shaft, rotatable relative to the main shaft; and...

[0011] A bearing bush is disposed between the inner wall of the housing and the swashplate, the swashplate being configured to slide relative to the bearing bush to adjust the degree of inclination of the swashplate relative to the main shaft;

[0012] The swashplate plunger pump further includes a first damping mechanism and a second damping mechanism. The first damping mechanism is disposed between the distribution plate and the inner wall of the end cover, and the second damping mechanism is disposed between the inner wall of the housing and the bearing.

[0013] The application of this application has the following beneficial effects: by providing a first vibration damping mechanism between the distribution plate and the inner wall of the end cover, the transmission of vibration from the distribution plate to the end cover can be reduced, thereby reducing noise. At the same time, by providing a second vibration damping mechanism between the inner wall of the housing and the bearing bush, the transmission of vibration from the swashplate to the end cover via the bearing bush can be reduced, thereby reducing noise.

[0014] Optionally, the first vibration damping mechanism includes a first rigid layer, a second rigid layer, and a first elastic layer disposed between the first rigid layer and the second rigid layer. The first vibration damping mechanism is fixedly installed on the inner wall of the end cap, and the distribution plate is fixedly installed on the first vibration damping mechanism and fits against the first rigid layer. The second vibration damping mechanism includes a third rigid layer, a fourth rigid layer, and a second elastic layer disposed between the third rigid layer and the fourth rigid layer. The second vibration damping mechanism is arc-shaped and adapted to the bearing bush. The second vibration damping mechanism is fixedly installed on the inner wall of the housing, and the bearing bush is fixedly installed on the second vibration damping mechanism and fits against the third rigid layer.

[0015] Optionally, the inner wall of the end cap is provided with a mounting groove, the mounting groove surrounds the second shaft hole and the two are connected, the first vibration damping mechanism includes an annular axial vibration damping part, the axial vibration damping part is fixedly disposed in the mounting groove; the axial vibration damping part is located between the bottom wall of the mounting groove and the distribution plate along the axial direction of the main shaft, and the axial vibration damping part is provided with a through hole adapted to the oil passage hole on the distribution plate.

[0016] Optionally, a second bearing is provided in the second shaft hole, and the main shaft is rotatably disposed in the second shaft hole through the second bearing; the first vibration damping mechanism further includes a cylindrical radial vibration damping part, which is integrally formed with the axial vibration damping part, and the radial vibration damping part is located between the outer ring wall of the second bearing and the inner ring wall of the second shaft hole along the radial direction of the main shaft.

[0017] Optionally, a protrusion is formed on the side surface of the distribution plate facing the axial vibration damping part. The distribution plate fits with the axial vibration damping part through the protrusion, and the oil passage hole of the distribution plate is provided through the protrusion to reduce the contact area between the distribution plate and the axial vibration damping part.

[0018] Optionally, the axial damping part has a connecting lug, the connecting lug is provided with a first connecting hole, the distribution plate is provided with a second connecting hole aligned with the first connecting hole, and the distribution plate and the first damping mechanism are fixedly installed on the bottom wall of the mounting groove by screws passing through the first connecting hole and the second connecting hole.

[0019] Optionally, the first elastic layer is an elastic pad, and the two sides of the first elastic layer are respectively bonded and fixed to the first rigid layer and the second rigid layer; the second elastic layer is an elastic pad, and the two sides of the second elastic layer are respectively bonded and fixed to the third rigid layer and the fourth rigid layer.

[0020] Optionally, the second elastic layer includes a first rubber pad and a second rubber pad. The first rubber pad is bonded and fixed to the surface of the third rigid layer facing the fourth rigid layer, and the second rubber pad is bonded and fixed to the surface of the fourth rigid layer facing the third rigid layer. The first rubber pad is provided with a first positioning groove, and the second rubber pad is provided with a second positioning groove aligned with the first positioning groove. The second damping mechanism further includes a compression spring and a connecting rope. One end of the compression spring extends into the first positioning groove and abuts against the bottom wall of the first positioning groove, and the other end of the compression spring extends into the second positioning groove and abuts against the bottom wall of the second positioning groove. The two ends of the connecting rope are respectively fixed to the third rigid layer and the fourth rigid layer and limit the distance between the third rigid layer and the fourth rigid layer to within a set length, so that the compression spring is always in a compressed state.

[0021] Optionally, the connecting rope passes through the compression spring.

[0022] Optionally, both the third and fourth rigid layers are metal plates, the fourth rigid layer is welded and fixed to the inner wall of the housing, and the third rigid layer is welded and fixed to the bearing bush.

[0023] These features and advantages of this application will be disclosed in detail in the following specific embodiments and accompanying drawings. The best embodiments or means of this application will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this application. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0024] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0025] Figure 1 This is a schematic diagram of the structure of a swashplate piston pump provided in Embodiment 1 of this application;

[0026] Figure 2 for Figure 1 A cross-sectional view of a swashplate piston pump along the AA direction;

[0027] Figure 3 Exploded view of the end cover, first damping mechanism, distributor plate, second bearing and cylinder block;

[0028] Figure 4 An exploded view of the end cap, first damping mechanism, distributor plate, second bearing and cylinder block from another perspective;

[0029] Figure 5 Exploded view of the first vibration damping mechanism;

[0030] Figure 6 This is a sectional view of the end cap, the first damping mechanism, the distributor plate, the second bearing, and the cylinder block;

[0031] Figure 7 This is an exploded side view of the bearing and the second vibration damping mechanism in Embodiment 1;

[0032] Figure 8 This is a side sectional view of the bearing and the second vibration damping mechanism in Embodiment 2.

[0033] The components are as follows: 1. Housing; 2. End cap; 20. Second shaft hole; 21. Second bearing; 22. Mounting groove; 23. Oil suction hole; 24. Oil outlet hole; 3. Main shaft; 4. Distribution plate; 40. Oil passage hole; 41. Protrusion; 42. Second connecting hole; 5. Swashplate; 6. Bearing shell; 7. Cylinder block; 70. Plunger; 8. First vibration damping mechanism; 80. Axial vibration damping part; 800. Connecting ear; 801. First connecting hole; 802. Through hole; 81. Radial vibration damping part; 82. First rigid layer; 83. Second rigid layer; 84. First elastic layer; 9. Second vibration damping mechanism; 90. Third rigid layer; 91. Fourth rigid layer; 92. Second elastic layer; 920. First rubber pad; 9200. First positioning groove; 921. Second rubber pad; 9210. Second positioning groove; 93. Compression spring; 94. Connecting rope. Detailed Implementation

[0034] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this application and should not be construed as limiting it.

[0035] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0036] Example 1: This example provides a swashplate piston pump, such as... Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the swashplate plunger pump includes a housing 1, an end cap 2, a main shaft 3, a distribution plate 4, a swashplate 5, and a bearing 6. The housing 1 has a cavity and a first shaft hole (not shown). The end cap 2 covers the housing 1 and has a second shaft hole 20. The main shaft 3 extends into the cavity from the outside and is rotatably mounted on the housing 1 and end cap 2 through the first and second shaft holes 20. The distribution plate 4, swashplate 5, and bearing 6 are all disposed within the cavity. The distribution plate 4 is fitted around the main shaft 3 and rotatably mounted relative to it. The swashplate 5 is fitted around the main shaft 3 and rotatably mounted relative to it. That is, when the main shaft 3 rotates actively, both the distribution plate 4 and the swashplate 5 remain stationary relative to it. The bearing 6 is disposed between the inner wall of the housing 1 and the swashplate 5. The swashplate 5 is configured to slide relative to the bearing 6 to adjust its tilt relative to the main shaft 3. The swashplate plunger pump provided in this embodiment also includes a first damping mechanism 8 and a second damping mechanism 9. The first damping mechanism 8 is disposed between the distribution plate 4 and the inner wall of the end cover 2, and the second damping mechanism 9 is disposed between the inner wall of the housing 1 and the bearing 6.

[0037] By providing a first vibration damping mechanism 8 between the distribution plate 4 and the inner wall of the end cover 2, direct rigid contact between the distribution plate 4 and the inner wall of the end cover 2 can be avoided, thereby reducing the transmission of vibration of the distribution plate 4 to the end cover 2 and thus reducing noise. At the same time, by providing a second vibration damping mechanism 9 between the inner wall of the housing 1 and the bearing 6, direct rigid contact between the bearing 6 and the inner wall of the housing 1 can be avoided, thereby reducing the transmission of vibration of the swashplate 5 to the end cover 2 via the bearing 6 and thus reducing noise.

[0038] It is readily understood that the swashplate plunger pump provided in this embodiment also includes a cylinder body 7 and a plunger 70 disposed on the cylinder body 7. Specifically, the cylinder body 7 is fixedly sleeved outside the main shaft 3, and the cylinder body 7 is provided with a plunger 70 mounting hole, in which the plunger 70 is slidably mounted. The cylinder body 7 and the plunger 70 are located between the swashplate 5 and the distribution plate 4. The ball head of the plunger 70 abuts against the side surface of the swashplate 5 facing the cylinder body 7, and the other side surface of the cylinder body 7 away from the plunger 70 is rotatably engaged with the distribution plate 4. The distribution plate 4 is provided with an oil passage hole 40, and the end cap 2 is provided with an oil passage communicating with the aforementioned oil passage hole 40. The end cap 2 is respectively provided with an oil suction hole 23 and an oil outlet hole 24 communicating with the aforementioned oil passage. When the main shaft 3 rotates, it drives the cylinder 7 and the plunger 70 mounted on the cylinder 7 to rotate around the axis of the main shaft 3. Because the swashplate 5 is inclined relative to the cylinder 7, the plunger 70 can reciprocate linearly along the axial direction of the main shaft 3 under the action of the swashplate 5 during rotation. When the plunger 70 moves outward relative to the plunger 70 mounting hole, hydraulic oil can be drawn in from outside the housing 1 through the aforementioned suction hole 23; when the plunger 70 moves inward relative to the plunger 70 mounting hole, hydraulic oil can be discharged from inside the housing 1 through the aforementioned outlet hole 24. The working principle of the swashplate plunger pump described above is existing technology and will not be elaborated further here.

[0039] Combination Figure 5 and Figure 6 As shown, the first vibration damping mechanism 8 in this embodiment includes an axial vibration damping part 80 and a radial vibration damping part 81, with the radial vibration damping part 81 and the axial vibration damping part 80 forming an integral structure. The axial vibration damping part 80 is annular, and the radial vibration damping part 81 is cylindrical. Both the axial vibration damping part 80 and the radial vibration damping part 81 include a first rigid layer 82, a second rigid layer 83, and a first elastic layer 84 disposed between the first rigid layer 82 and the second rigid layer 83.

[0040] In this embodiment, the first vibration damping mechanism 8 is fixedly installed on the inner wall of the end cover 2, and the distribution plate 4 is fixedly installed on the first vibration damping mechanism 8 and is in contact with the first rigid layer 82. Specifically, the inner wall of the end cover 2 in this embodiment is provided with a mounting groove 22, which surrounds the second shaft hole 20 and the two are connected. The axial vibration damping part 80 is fixedly installed in the mounting groove 22, and the axial vibration damping part 80 is located between the bottom wall of the mounting groove 22 and the distribution plate 4 along the axial direction of the main shaft 3. In this way, the vibration energy generated by the distribution plate 4 when the swashplate plunger pump is working can be absorbed by the first elastic layer 84 in the axial vibration damping part 80, reducing or avoiding the transmission of vibration to the end cover 2, thereby reducing noise. At the same time, the axial vibration damping part 80 is provided with a through hole 802 that matches the oil passage hole 40 on the distribution plate 4. By providing the through hole 802, the oil passage hole 40 on the distribution plate 4 can be connected to the aforementioned oil passage.

[0041] In this embodiment, a second bearing 21 is provided inside the second shaft hole 20, and the main shaft 3 is rotatably mounted inside the second shaft hole 20 via the second bearing 21. A radial damping section 81 is located radially between the outer ring wall of the second bearing 21 and the inner ring wall of the second shaft hole 20. Thus, the vibration energy generated by the second bearing 21 during the operation of the swashplate plunger pump can be absorbed by the first elastic layer 84 in the radial damping section 81, reducing or preventing the transmission of vibration to the end cover 2, thereby reducing noise. It is easy to understand that a first shaft hole is also provided on the housing 1, and a first bearing is also provided inside the first shaft hole, with the main shaft 3 rotatably mounted inside the first shaft hole via the first bearing.

[0042] It should be noted that since the main component that transmits vibration to the end cover 2 is the distribution plate 4, in some optional embodiments, the first vibration damping mechanism 8 may only include the axial vibration damping part 80.

[0043] like Figure 5 As shown, in this embodiment, both the first rigid layer 82 and the second rigid layer 83 include an annular thin plate (the structure located on the axial damping part 80 in the first damping mechanism 8) and a cylinder extending axially outward from the aforementioned thin plate along the main shaft 3 (the structure located on the radial damping part 81 in the first damping mechanism 8). The first rigid layer 82 and the second rigid layer 83 can be made of hard plastic or metal, and both the first rigid layer 82 and the second rigid layer 83 are integrally molded structures. The first elastic layer 84 is made of rubber; specifically, the first elastic layer 84 is an elastic pad, and its two side surfaces are respectively bonded and fixed to the first rigid layer 82 and the second rigid layer 83. In other optional embodiments, the first elastic layer 84 can also be a magnetorheological elastomer material.

[0044] Furthermore, in combination Figure 4 As shown, in this embodiment, the distribution plate 4 has a protrusion 41 formed on the surface facing the axial vibration damping part 80. The distribution plate 4 fits against the axial vibration damping part 80 through the protrusion 41, and the oil passage 40 of the distribution plate 4 is provided through the protrusion 41 to reduce the contact area between the distribution plate 4 and the axial vibration damping part 80. This reduces the vibration energy transmission from the distribution plate 4 to the first rigid layer 82, further improving the vibration damping and noise reduction effect of the first vibration damping mechanism 8.

[0045] As mentioned above, in this embodiment, "the first vibration damping mechanism 8 is fixedly installed on the inner wall of the end cover 2, and the distribution plate 4 is fixedly installed on the first vibration damping mechanism 8". Specifically, in this embodiment, the axial vibration damping part 80 has a connecting ear 800, the connecting ear 800 is provided with a first connecting hole 801, and the distribution plate 4 is provided with a second connecting hole 42 aligned with the first connecting hole 801. The distribution plate 4 and the first vibration damping mechanism 8 are fixedly installed on the bottom wall of the mounting groove 22 by screws passing through the first connecting hole 801 and the second connecting hole 42. During assembly, the first vibration damping mechanism 8 and the distribution plate 4 can be fixedly installed on the bottom wall of the mounting groove 22 first, and then the second bearing 21 can be installed into the second shaft hole 20.

[0046] Combination Figure 2 and Figure 7 As shown, the second vibration damping mechanism 9 in this embodiment includes a third rigid layer 90, a fourth rigid layer 91, and a second elastic layer 92 disposed between the third rigid layer 90 and the fourth rigid layer 91. The second vibration damping mechanism 9 is arc-shaped and adapted to the bearing 6. The second vibration damping mechanism 9 is fixedly installed on the inner wall of the housing 1, and the bearing 6 is fixedly installed on the second vibration damping mechanism 9 and fits against the third rigid layer 90.

[0047] It is easy to understand that the bearing 6 has a smooth, semi-cylindrical surface in the shape of a tile. The side of the swashplate 5 facing the bearing 6 can rotate with the bearing 6. The bearing 6 is fixed to the inner wall of the housing 1. The swashplate 5 can rotate relative to the bearing 6 around a predetermined axis to adjust the tilt angle of the swashplate 5 relative to the cylinder 7. The predetermined axis is perpendicular to the axis of the main shaft 3. Adjusting the tilt angle of the swashplate 5 relative to the cylinder 7 can change the oil intake and output. In this embodiment, the second vibration damping mechanism 9 is set to be arc-shaped and adapted to the bearing 6. By setting the second vibration damping mechanism 9 between the bearing 6 and the inner wall of the housing 1, the bearing 6 can be prevented from directly and rigidly contacting the inner wall of the housing 1. Thus, the vibration energy generated by the swashplate 5 when the swashplate plunger pump is working is transmitted through the bearing 6 to the second elastic layer 92 in the second vibration damping mechanism 9 and absorbed by the second elastic layer 92, which can reduce or avoid the transmission of vibration to the housing 1, thereby reducing noise.

[0048] Similar to the first damping mechanism 8 in terms of material and principle, the second elastic layer 92 in this embodiment is an elastic pad, and its two side surfaces are respectively bonded and fixed to the third rigid layer 90 and the fourth rigid layer 91. The third rigid layer 90 and the fourth rigid layer 91 are both made of hard plastic or metal, while the second elastic layer 92 is made of rubber. In other optional embodiments, the second elastic layer 92 can also be made of magnetorheological elastomer material.

[0049] In addition, in this embodiment, the bearing 6 and the second damping mechanism 9 are fixedly installed on the inner wall of the housing 1 by screws that pass through the bearing 6 and the second damping mechanism 9.

[0050] Example 2: The difference between this example and the above examples is that the second vibration damping mechanism 9 in this example is different from the second vibration damping mechanism 9 in the above examples. Specifically, in conjunction with... Figure 8 As shown in the figure, the second vibration damping mechanism 9 in this embodiment also includes a compression spring 93 and a connecting rope 94. The second elastic layer 92 in the second vibration damping mechanism 9 in this embodiment includes a first rubber pad 920 and a second rubber pad 921.

[0051] The inventors discovered through research that the vibration generated during operation of the swashplate piston pump is mainly caused by the axial interaction between the piston 70 and the swashplate 5 along the main shaft 3, and the radial interaction between the main shaft 3 and the first and second bearings 21. Therefore, the distribution plate 4 transmits the vibration along the axial direction of the main shaft 3 to the axial damping part 80, and the second bearing 21 transmits the vibration along the radial direction of the main shaft 3 to the radial damping part 81; the swashplate 5 and the bearing bush 6 transmit the vibration along the axial direction of the main shaft 3 to the second damping mechanism 9. As mentioned above, in this embodiment, both the first elastic layer 84 and the second elastic layer 92 are rubber pads made of rubber material. When the rubber pad is subjected to vibration along its thickness direction and perpendicular to its thickness direction at the same time, the following problems are likely to occur: the vibration perpendicular to the thickness direction of the rubber pad causes a certain deformation of the rubber pad. If the rubber pad is subjected to vibration along its thickness direction after the above deformation, it may cause the rubber pad to undergo deformation that is not easy to recover. After a certain period of time, the rubber pad, as an elastic layer, may fail.

[0052] It is easy to understand that, since the first vibration damping mechanism 8 includes an axial vibration damping part 80 and a radial vibration damping part 81, the first elastic layer 84 in the axial vibration damping part 80 can reduce the radial vibration along the main shaft 3 by relying on the first elastic layer 84 in the radial vibration damping part 81. Therefore, in this embodiment, the second elastic layer 92 of the second vibration damping mechanism 9 is further improved. Specifically, in this embodiment, the first rubber pad 920 is bonded and fixed to the surface of the third rigid layer 90 facing the fourth rigid layer 91, and the second rubber pad 921 is bonded and fixed to the surface of the fourth rigid layer 91 facing the third rigid layer 90. The first rubber pad 920 is provided with a first positioning groove 9200, and the second rubber pad 921 is provided with a second positioning groove 9210 aligned with the first positioning groove 9200. The second damping mechanism 9 also includes a compression spring 93 and a connecting rope 94. One end of the compression spring 93 extends into the first positioning groove 9200 and abuts against the bottom wall of the first positioning groove 9200, and the other end of the compression spring 93 extends into the second positioning groove 9210 and abuts against the bottom wall of the second positioning groove 9210. The two ends of the connecting rope 94 are respectively fixed to the third rigid layer 90 and the fourth rigid layer 91, and the distance between the third rigid layer 90 and the fourth rigid layer 91 is limited to a set length so that the compression spring 93 is always in a compressed state.

[0053] It is easy to understand that the surface of the bearing 6 facing the third rigid layer 90 is curved. When the bearing 6 transmits vibration to the third rigid layer 90, the vibration transmitted from any point on the curved surface to the third rigid layer 90 has a vibration component along the perpendicular direction (first direction) of the tangent plane at that point and a vibration component along a second direction perpendicular to the first direction. Through the above structural design, the first rubber pad 920 and the second rubber pad 921 mainly absorb the vibration component along the first direction, while the vibration component in the second direction is mainly absorbed by the compression spring 93. In this way, the deformation effect of the vibration component in the second direction on the first rubber pad 920 and the second rubber pad 921 can be reduced, and the deformation of the first rubber pad 920 and the second rubber pad 921 that is not easy to recover can be slowed down, thereby extending the service life of the second vibration damping mechanism 9. At the same time, it can also improve the vibration damping and noise reduction effect of the second vibration damping mechanism 9.

[0054] In this embodiment, the connecting rope 94 passes through the compression spring 93. The connecting rope 94 can be made of steel wire, high-strength rubber, etc. Both ends of the connecting rope 94 are fixed to the third rigid layer 90 and the fourth rigid layer 91, respectively. By limiting the distance between the first rigid layer 82 and the fourth rigid layer 91 within a set length, the compression spring 93 is kept in a compressed state, thus giving it a certain pre-compression amount, enabling it to effectively absorb vibration energy along the second direction. When the connecting rope 94 is made of steel wire, it can be directly welded and fixed to the third rigid layer 90 and the fourth rigid layer 91. When the connecting rope 94 is made of high-strength rubber, it can be wound around a screw and tightened onto the third rigid layer 90 and the fourth rigid layer 91 through the screw threads.

[0055] Furthermore, unlike the scheme in Embodiment 1 where the bearing 6 and the second vibration damping mechanism 9 are fixed to the inner wall of the housing 1 using screws, in this embodiment, both the third rigid layer 90 and the fourth rigid layer 91 are metal plates. The fourth rigid layer 91 is welded and fixed to the inner wall of the housing 1, and the third rigid layer 90 is welded and fixed to the bearing 6. This structural design avoids the direct transmission of vibration to the inner wall of the housing 1 through the screws. Specifically, the third rigid layer 90 and the fourth rigid layer 91 can be made of metal plates such as steel plates, aluminum alloy plates, or magnesium alloy plates.

[0056] When assembling the swashplate plunger pump provided in this embodiment, firstly, the fourth rigid layer 91, to which the second rubber pad 921 is bonded, in the second vibration damping mechanism 9 can be welded and fixed to the inner wall of the housing 1 (one end of the connecting rope 94 can be pre-fixed to the fourth rigid layer 91), and then one end of the compression spring 93 can be inserted into the second positioning groove 9210 on the second rubber pad 921. Next, the third rigid layer 90, to which the first rubber pad 920 is bonded, can be welded and fixed to the bearing 6, and then the first positioning groove 9200 on the third rigid layer 90 can be aligned with the other end of the compression spring 93 and inserted. Finally, the other end of the connecting rope 94 can be fixedly installed onto the third rigid layer 90.

[0057] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Those skilled in the art should understand that this application includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this application will be included within the scope of the claims.

Claims

1. Swashplate piston pump, including: The housing (1) has a cavity and a first shaft hole; End cap (2), which is provided on the housing (1) and has a second shaft hole (20); The main shaft (3) extends from the outside into the cavity and is rotatably mounted on the housing (1) and the end cap (2) through the first shaft hole and the second shaft hole (20); The distribution plate (4) is located inside the cavity and sleeved outside the main shaft (3) and rotates relative to the main shaft (3); A swashplate (5), which is located within the cavity and sleeved outside the main shaft (3) and rotatable relative to the main shaft (3); and, A bearing (6) is disposed between the inner wall of the housing (1) and the swash plate (5), the swash plate (5) being configured to slide relative to the bearing (6) to adjust the degree of inclination of the swash plate (5) relative to the main shaft (3); The swashplate plunger pump is characterized in that it further includes a first damping mechanism (8) and a second damping mechanism (9), wherein the first damping mechanism (8) is disposed between the distribution plate (4) and the inner wall of the end cover (2), and the second damping mechanism (9) is disposed between the inner wall of the housing (1) and the bearing (6); The first vibration damping mechanism (8) includes a first rigid layer (82), a second rigid layer (83), and a first elastic layer (84) disposed between the first rigid layer (82) and the second rigid layer (83). The first vibration damping mechanism (8) is fixedly installed on the inner wall of the end cap (2). The distribution plate (4) is fixedly installed on the first vibration damping mechanism (8) and is in contact with the first rigid layer (82). The second vibration damping mechanism (9) includes a third rigid layer (90), a fourth rigid layer (91), and a second elastic layer (92) disposed between the third rigid layer (90) and the fourth rigid layer (91). The second vibration damping mechanism (9) is arc-shaped and adapted to the bearing (6). The second vibration damping mechanism (9) is fixedly installed on the inner wall of the housing (1). The bearing (6) is fixedly installed on the second vibration damping mechanism (9) and fits against the third rigid layer (90). The second elastic layer (92) includes a first rubber pad (920) and a second rubber pad (921). The first rubber pad (920) is bonded and fixed to the side surface of the third rigid layer (90) facing the fourth rigid layer (91), and the second rubber pad (921) is bonded and fixed to the side surface of the fourth rigid layer (91) facing the third rigid layer (90). The first rubber pad (920) is provided with a first positioning groove (9200), and the second rubber pad (921) is provided with a second positioning groove (9210) aligned with the first positioning groove (9200). The second damping mechanism (9) further includes a compression spring (93) and a connecting rope (94). One end of the compression spring (93) extends into the first positioning groove (9200) and abuts against the bottom wall of the first positioning groove (9200). The other end of the compression spring (93) extends into the second positioning groove (9210) and abuts against the bottom wall of the second positioning groove (9210). The two ends of the connecting rope (94) are fixed to the third rigid layer (90) and the fourth rigid layer (91) respectively, and the distance between the third rigid layer (90) and the fourth rigid layer (91) is limited to a set length so that the compression spring (93) is always in a compressed state.

2. The swashplate piston pump as described in claim 1, characterized in that, The inner wall of the end cap (2) is provided with a mounting groove (22), which surrounds the second shaft hole (20) and the two are connected. The first damping mechanism (8) includes an annular axial damping part (80), which is fixedly disposed in the mounting groove (22). The axial damping part (80) is located between the bottom wall of the mounting groove (22) and the distribution plate (4) along the axial direction of the main shaft (3), and the axial damping part (80) is provided with a through hole (802) that matches the oil passage hole (40) on the distribution plate (4).

3. The swashplate piston pump as described in claim 2, characterized in that, A second bearing (21) is provided in the second shaft hole (20), and the main shaft (3) is rotatably disposed in the second shaft hole (20) through the second bearing (21); The first vibration damping mechanism (8) further includes a cylindrical radial vibration damping part (81), which is integral with the axial vibration damping part (80). The radial vibration damping part (81) is located radially along the main shaft (3) between the outer ring wall of the second bearing (21) and the inner ring wall of the second shaft hole (20).

4. The swashplate piston pump as described in claim 2, characterized in that, The distribution plate (4) has a protrusion (41) on one side surface facing the axial damping part (80). The distribution plate (4) fits into the axial damping part (80) through the protrusion (41), and the oil passage (40) of the distribution plate (4) is provided through the protrusion (41) to reduce the contact area between the distribution plate (4) and the axial damping part (80).

5. The swashplate piston pump as described in claim 2, characterized in that, The axial damping part (80) has a connecting ear (800), the connecting ear (800) is provided with a first connecting hole (801), the distribution plate (4) is provided with a second connecting hole (42) aligned with the first connecting hole (801), the distribution plate (4) and the first damping mechanism (8) are fixedly installed on the bottom wall of the mounting groove (22) by screws passing through the first connecting hole (801) and the second connecting hole (42).

6. The swashplate piston pump as described in any one of claims 2 to 5, characterized in that, The first elastic layer (84) is a rubber pad, and the two sides of the first elastic layer (84) are respectively bonded and fixed to the first rigid layer (82) and the second rigid layer (83); The second elastic layer (92) is a rubber pad, and the two sides of the second elastic layer (92) are respectively bonded and fixed to the third rigid layer (90) and the fourth rigid layer (91).

7. The swashplate piston pump as described in claim 1, characterized in that, The connecting rope (94) passes through the compression spring (93).

8. The swashplate piston pump as described in claim 1, characterized in that, The third rigid layer (90) and the fourth rigid layer (91) are both metal plates. The fourth rigid layer (91) is welded and fixed to the inner wall of the housing (1), and the third rigid layer (90) is welded and fixed to the bearing (6).

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