Swash plate type plunger pump

Abstract

The invention discloses a swash plate type plunger pump, and belongs to the technical field of hydraulic power equipment, and the swash plate type plunger pump comprises a shell which is provided with a containing cavity and a first shaft hole; the end cover covers the shell and is provided with a second shaft hole; the main shaft extends into the accommodating cavity and is rotationally arranged on the shell and the end cover through the first shaft hole and the second shaft hole; the valve plate is sleeved outside the main shaft and is rotationally arranged relative to the main shaft; the swash plate is sleeved outside the main shaft and is rotationally arranged relative to the main shaft; the bearing bush is arranged between the inner wall of the shell and the swash plate, and the swash plate is configured to slide relative to the bearing bush so as to adjust the inclination degree of the swash plate relative to the main shaft; the swash plate type plunger pump further comprises a first vibration reduction mechanism and a second vibration reduction mechanism, the first vibration reduction mechanism is arranged between the valve plate and the inner wall of the end cover, and the second vibration reduction mechanism is arranged between the inner wall of the shell and the bearing bush. According to the invention, the vibration of the valve plate and the swash plate transmitted to the end cover and the shell can be reduced, so that the noise is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic equipment, and in particular to a swash plate type plunger pump. Background Art

[0002] The swash plate type plunger pump is a commonly used hydraulic power equipment, which generally includes a housing, a main shaft, a cylinder body, a valve plate, a swash plate and a plunger. The cylinder body, the valve plate and the swash plate are all sleeved on the outside of the main shaft. The cylinder body is fixedly connected to the main shaft and can rotate with the main shaft. The valve plate and the swash plate are both set to rotate relative to the main shaft. The plunger is set on the side of the cylinder body facing the swash plate, and the swash plate is set to be inclined relative to the cylinder body. When the main shaft rotates, the plunger follows the cylinder body and is driven by the main shaft to rotate synchronously. At the same time, under the limiting and squeezing action of the swash plate, the plunger moves back and forth in a straight line along the axial direction relative to the plunger mounting hole on the cylinder body to achieve oil suction and oil pressure.

[0003] With the development of intelligent engineering machinery, higher requirements are put forward for the vibration and noise of swash plate piston pumps. However, the vibration excitation inside such swash plate piston pumps in the related art will be transmitted to the housing through the valve plate and the swash plate, thereby causing noise problems. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art to a certain extent. To this end, the present application provides a slant plate type plunger pump.

[0005] In order to achieve the above purpose, the present application adopts the following technical solution: a swash plate plunger pump, comprising:

[0006] A housing, which is formed with a cavity and provided with a first axial hole;

[0007] An end cover, which is disposed on the housing and is provided with a second axial hole;

[0008] A main shaft, which extends from the outside into the cavity and is rotatably disposed on the housing and the end cover through the first shaft hole and the second shaft hole;

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

[0010] A swash plate, which is located in the cavity and sleeved outside the main shaft and is rotatable relative to the main shaft; and

[0011] A bearing bushing is disposed between the inner wall of the housing and the swash plate, the swash plate being configured to be able to slide relative to the bearing bushing to adjust the inclination of the swash plate relative to the main shaft;

[0012] The swash plate type piston pump further comprises a first vibration damping mechanism and a second vibration damping mechanism, wherein the first vibration damping mechanism is arranged between the distribution plate and the inner wall of the end cover, and the second vibration damping mechanism is arranged between the inner wall of the housing and the bearing bush.

[0013] The application of the present invention has the following beneficial effects: by arranging the first vibration reduction mechanism between the valve plate and the inner wall of the end cover, the vibration of the valve plate can be reduced from being transmitted to the end cover, thereby reducing noise. At the same time, by arranging the second vibration reduction mechanism between the inner wall of the housing and the bearing bush, the vibration of the swash plate can be reduced from being transmitted to the end cover through the bearing bush, thereby reducing noise.

[0014] Optionally, the first vibration damping mechanism includes a first rigid layer, a second rigid layer, and a first elastic layer arranged between the first rigid layer and the second rigid layer, the first vibration damping mechanism is fixedly mounted on the inner wall of the end cover, and the distribution plate is fixedly mounted on the first vibration damping mechanism and fits with the first rigid layer; the second vibration damping mechanism includes a third rigid layer, a fourth rigid layer, and a second elastic layer arranged between the third rigid layer and the fourth rigid layer, the second vibration damping mechanism is arc-shaped and fits with the bearing shell; the second vibration damping mechanism is fixedly mounted on the inner wall of the shell, and the bearing shell is fixedly mounted on the second vibration damping mechanism and fits with the third rigid layer.

[0015] Optionally, the inner wall of the end cover is provided with a mounting groove, the mounting groove surrounds the outside of the second axial hole and the two are connected, the first vibration damping mechanism includes an annular axial vibration damping portion, the axial vibration damping portion is fixedly arranged in the mounting groove; the axial vibration damping portion 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 portion is provided with a through hole adapted to the oil hole on the distribution plate.

[0016] Optionally, a second bearing is arranged in the second axial hole, and the main shaft is rotatably arranged in the second axial hole through the second bearing; the first vibration damping mechanism also includes a cylindrical radial vibration damping portion, the radial vibration damping portion and the axial vibration damping portion form an integrated structure, and the radial vibration damping portion is located between the outer ring wall of the second bearing and the inner ring wall of the second axial hole along the radial direction of the main shaft.

[0017] Optionally, a protrusion is formed on the surface of the distribution disc facing the axial vibration damping part, the distribution disc is fitted with the axial vibration damping part through the protrusion, and the oil hole of the distribution disc passes through the protrusion to reduce the contact area between the distribution disc and the axial vibration damping part.

[0018] Optionally, the axial vibration damping portion is formed with a connecting ear, the connecting ear is provided with a first connecting hole, and the distribution plate is provided with a second connecting hole aligned with the first connecting hole, and the distribution plate and the first vibration damping mechanism are fixed to 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 both side surfaces 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 both side surfaces 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 adhesively fixed to the side surface of the third rigid layer facing the fourth rigid layer, and the second rubber pad is adhesively fixed to the side 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 vibration damping mechanism also 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, the third rigid layer and the fourth rigid layer are both metal plates, the fourth rigid layer is welded and fixed to the inner wall of the shell, and the third rigid layer is welded and fixed to the bearing shell.

[0023] These features and advantages of the present application will be disclosed in detail in the following specific embodiments and drawings. The best embodiments or means of the present application will be described in detail in conjunction with the drawings, but they are not intended to limit the technical solutions of the present application. In addition, there are multiple features, elements, and components that appear in each of the following texts and drawings, and different symbols or numbers are marked for convenience, but they all represent components with the same or similar structures or functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present application is further described below in conjunction with the accompanying drawings:

[0025] Figure 1 A schematic structural diagram of a swash plate plunger pump provided in Example 1 of the present application;

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

[0027] Figure 3 An exploded view of the end cover, the first vibration damping mechanism, the valve plate, the second bearing and the cylinder body;

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

[0029] Figure 5 is an exploded diagram of the first vibration reduction mechanism;

[0030] Figure 6 is a cross-sectional view of the end cover, the first vibration damping mechanism, the valve plate, the second bearing and the cylinder body;

[0031] Figure 7 It is a side exploded view of the bearing bush and the second vibration damping mechanism in the first embodiment;

[0032] Figure 8 It is a side sectional view of the bearing shell and the second vibration damping mechanism in the second embodiment.

[0033] Among them, 1. shell; 2. end cover; 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 hole; 41. protrusion; 42. second connecting hole; 5. inclined plate; 6. bearing; 7. cylinder block; 70. plunger; 8. first vibration damping mechanism; 80. axial vibration damping part; 800. connecting ear; 801. first connecting hole; 802. perforation; 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 DESCRIPTION

[0034] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments based on the embodiments are intended to be used to explain the present application and cannot be understood as limiting the present application.

[0035] References to "one embodiment" or "an example" or "an example" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment disclosed in the present application. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0036] Embodiment 1: This embodiment provides a swash plate plunger pump, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in , the swash plate type piston pump includes a housing 1, an end cover 2, a main shaft 3, a distribution plate 4, a swash plate 5 and a bearing bush 6. Among them, the housing 1 is formed with a cavity and is provided with a first shaft hole (not shown in the figure), the end cover 2 is covered on the housing 1 and is provided with a second shaft hole 20, the main shaft 3 extends from the outside into the cavity and is rotatably arranged on the housing 1 and the end cover 2 through the first shaft hole and the second shaft hole 20. The distribution plate 4, the swash plate 5 and the bearing bush 6 are all arranged in the above-mentioned cavity, the distribution plate 4 is sleeved outside the main shaft 3 and is rotatably arranged relative to the main shaft 3, and the swash plate 5 is sleeved outside the main shaft 3 and is rotatably arranged relative to the main shaft 3, that is, when the main shaft 3 actively rotates, the distribution plate 4 and the swash plate 5 can both remain stationary relative to the main shaft 3. The bearing bush 6 is arranged between the inner wall of the housing 1 and the swash plate 5, and the swash plate 5 is configured to be able to slide relative to the bearing bush 6 to adjust the inclination of the swash plate 5 relative to the main shaft 3. The swash plate type piston pump provided in this embodiment also includes a first vibration damping mechanism 8 and a second vibration damping mechanism 9. The first vibration damping mechanism 8 is arranged between the distribution plate 4 and the inner wall of the end cover 2, and the second vibration damping mechanism 9 is arranged between the inner wall of the housing 1 and the bearing 6.

[0037] By providing the first vibration damping mechanism 8 between the distributor plate 4 and the inner wall of the end cover 2, the distributor plate 4 can be prevented from being in direct rigid contact with the inner wall of the end cover 2, thereby reducing the transmission of the vibration of the distributor plate 4 to the end cover 2, thereby reducing the noise. At the same time, by providing the second vibration damping mechanism 9 between the inner wall of the housing 1 and the bearing bush 6, the bearing bush 6 can be prevented from being in direct rigid contact with the inner wall of the housing 1, thereby reducing the transmission of the vibration of the swash plate 5 to the end cover 2 through the bearing bush 6, thereby reducing the noise.

[0038] It is easy to understand that the swash plate type plunger pump provided in this embodiment also includes a cylinder body 7 and a plunger 70 arranged on the cylinder body 7. Specifically, the cylinder body 7 is fixedly sleeved outside the main shaft 3, and a plunger 70 mounting hole is provided on the cylinder body 7. The plunger 70 is slidably installed in the aforementioned plunger 70 mounting hole. The cylinder body 7 and the plunger 70 are located between the swash plate 5 and the distribution plate 4. The ball head of the plunger 70 abuts against the side surface of the swash plate 5 facing the cylinder body 7, and the other side surface of the cylinder body 7 away from the plunger 70 is rotatably matched with the distribution plate 4. The distribution plate 4 is provided with an oil hole 40, and the end cover 2 is provided with an oil passage connected to the aforementioned oil hole 40. The end cover 2 is respectively provided with an oil suction hole 23 and an oil outlet hole 24 connected to the aforementioned oil passage. When the main shaft 3 rotates, the cylinder body 7 and the plunger 70 disposed on the cylinder body 7 rotate around the axis of the main shaft 3. Since the swash plate 5 is inclined relative to the cylinder body 7, the plunger 70 can perform reciprocating linear motion along the axial direction of the main shaft 3 under the action of the swash plate 5 during the rotation process. When the plunger 70 moves outward relative to the plunger 70 mounting hole, hydraulic oil can be sucked inward from the outside of the housing 1 through the aforementioned oil suction hole 23; when the plunger 70 moves inward relative to the plunger 70 mounting hole, hydraulic oil can be discharged from the inside of the housing 1 through the aforementioned oil outlet hole 24. The working principle of the above-mentioned swash plate type plunger pump is a prior art and will not be repeated here.

[0039] Combination Figure 5 and Figure 6 As shown in , the first vibration damping mechanism 8 in this embodiment includes an axial vibration damping portion 80 and a radial vibration damping portion 81, and the radial vibration damping portion 81 and the axial vibration damping portion 80 form an integral structure. The axial vibration damping portion 80 is annular, the radial vibration damping portion 81 is cylindrical, and the axial vibration damping portion 80 and the radial vibration damping portion 81 each 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] The first vibration damping mechanism 8 in this embodiment is fixedly mounted on the inner wall of the end cover 2, and the distribution plate 4 is fixedly mounted 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 outside of the second shaft hole 20 and the two are connected, and the axial vibration damping part 80 is fixedly arranged 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 inclined plate type piston 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 achieving the effect of reducing noise. At the same time, the axial vibration damping part 80 is provided with a through hole 802 that is compatible with the oil hole 40 on the distribution plate 4, and the oil hole 40 on the distribution plate 4 can be connected to the aforementioned oil passage by setting the through hole 802.

[0041] In this embodiment, a second bearing 21 is arranged in the second shaft hole 20, and the main shaft 3 is rotatably arranged in the second shaft hole 20 through the second bearing 21. The radial vibration damping part 81 is located between the outer ring wall of the second bearing 21 and the inner ring wall of the second shaft hole 20 along the radial direction of the main shaft 3. In this way, the vibration energy generated by the second bearing 21 when the swash plate type piston pump is working can be absorbed by the first elastic layer 84 in the radial vibration damping part 81, reducing or avoiding the transmission of vibration to the end cover 2, thereby achieving the effect of reducing noise. It is easy to understand that the housing 1 is also correspondingly provided with a first shaft hole, and a first bearing is also arranged in the first shaft hole, and the main shaft 3 is rotatably arranged in the first shaft hole through the first bearing.

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

[0043] like Figure 5 As shown in , the first rigid layer 82 and the second rigid layer 83 in this embodiment both include a thin plate in an annular shape (a structure located on the axial vibration damping portion 80 in the first vibration damping mechanism 8) and a cylinder extending outward from the aforementioned thin plate along the axial direction of the main shaft 3 (a structure located on the radial vibration damping portion 81 in the first vibration damping mechanism 8). The first rigid layer 82 and the second rigid layer 83 can be made of hard plastic or metal, and the first rigid layer 82 and the second rigid layer 83 are both integrally formed structures. The first elastic layer 84 is made of rubber. Specifically, the first elastic layer 84 is an elastic pad, and the two side surfaces of the first elastic layer 84 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] Further, combined with Figure 4 As shown in , the distribution disc 4 in this embodiment is formed with a protrusion 41 on the surface of one side facing the axial vibration damping part 80, the distribution disc 4 is fitted with the axial vibration damping part 80 through the protrusion 41, and the oil hole 40 of the distribution disc 4 is arranged to penetrate the protrusion 41 to reduce the contact area between the distribution disc 4 and the axial vibration damping part 80. In this way, the vibration energy transmission from the distribution disc 4 to the first rigid layer 82 can be reduced, and the vibration reduction and noise reduction effect of the first vibration damping mechanism 8 can be further improved.

[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, the axial vibration damping part 80 in this embodiment is formed with a connecting ear 800, and 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 installation 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 installation groove 22 first, and then the second bearing 21 can be installed in the second shaft hole 20.

[0046] Combination Figure 2 and Figure 7 As shown in , 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 matches the bearing bush 6. The second vibration damping mechanism 9 is fixedly mounted on the inner wall of the housing 1, and the bearing bush 6 is fixedly mounted on the second vibration damping mechanism 9 and fits the third rigid layer 90.

[0047] It is easy to understand that the bearing bush 6 is formed with a smooth semi-cylindrical surface in the shape of a bush. The side of the swash plate 5 facing the bearing bush 6 can be rotated with the bearing bush 6. The bearing bush 6 is fixed on the inner wall of the housing 1. The swash plate 5 can rotate relative to the bearing bush 6 around a predetermined axis to adjust the inclination angle of the swash plate 5 relative to the cylinder body 7. The predetermined axis is perpendicular to the axis of the main shaft 3. The oil suction and discharge amount can be changed by adjusting the inclination angle of the swash plate 5 relative to the cylinder body 7. In this embodiment, the second damping mechanism 9 is correspondingly set to be arc-shaped and adapted to the bearing bush 6. By setting the second damping mechanism 9 between the bearing bush 6 and the inner wall of the housing 1, the bearing bush 6 can be prevented from directly and rigidly contacting the inner wall of the housing 1. Then, the vibration energy generated by the swash plate 5 when the swash plate type plunger pump is working is transmitted to the second elastic layer 92 in the second damping mechanism 9 through the bearing bush 6 and absorbed by the second elastic layer 92, which can reduce or avoid the transmission of vibration to the housing 1, thereby playing the effect of reducing noise.

[0048] The second elastic layer 92 in this embodiment is an elastic pad, and the two side surfaces of the second elastic layer 92 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, and the second elastic layer 92 is made of rubber. In other optional embodiments, the second elastic layer 92 can also be a magnetorheological elastomer material.

[0049] In addition, the bearing bush 6 and the second vibration damping mechanism 9 in this embodiment are fixedly mounted on the inner wall of the housing 1 by screws penetrating the bearing bush 6 and the second vibration damping mechanism 9 .

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

[0051] The inventor has found through research that the vibration generated by the swash plate type piston pump during operation is mainly generated by the interaction between the plunger 70 and the swash plate 5 along the axial direction of the main shaft 3 and the interaction between the main shaft 3 and the first bearing and the second bearing 21 along the radial direction. Therefore, the distribution plate 4 transmits vibration to the axial damping part 80 along the axial direction of the main shaft 3, and the second bearing 21 transmits vibration to the radial damping part 81 along the radial direction of the main shaft 3; the swash plate 5 and the bearing bush 6 transmit vibration to the second damping mechanism 9 along the axial direction of the main shaft 3. As mentioned above, the first elastic layer 84 and the second elastic layer 92 in this embodiment are both 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. When the rubber pad is subjected to vibration along its thickness direction after the above deformation, it may cause the rubber pad to produce deformation that is difficult to recover, and after a certain period of time, the rubber pad as the elastic layer may fail.

[0052] It is easy to understand that, since the first vibration damping mechanism 8 includes the axial vibration damping part 80 and the radial vibration damping part 81, the first elastic layer 84 in the axial vibration damping part 80 can rely on the first elastic layer 84 in the radial vibration damping part 81 to reduce the vibration along the radial direction of the main shaft 3. Therefore, in this embodiment, the second elastic layer 92 of the second vibration damping mechanism 9 is further improved. Specifically, the first rubber pad 920 in this embodiment 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, the second rubber pad 921 is provided with a second positioning groove 9210 aligned with the first positioning groove 9200, the second vibration reduction 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, 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 within 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 a curved surface. When the bearing 6 transmits vibration to the third rigid layer 90, the vibration transmitted to the third rigid layer 90 from any point on the curved surface has a vibration component along the perpendicular direction (first direction) of the tangent plane of the point and a vibration component along the 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 difficult to recover can be slowed down, thereby extending the service life of the second vibration damping mechanism 9. At the same time, the vibration reduction and noise reduction effect of the second vibration damping mechanism 9 can also be improved.

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

[0055] In addition, unlike the solution in the first embodiment in which the bearing bush 6 and the second vibration damping mechanism 9 are fixedly installed on the inner wall of the housing 1 by screws, the third rigid layer 90 and the fourth rigid layer 91 in this embodiment are both metal plates, the fourth rigid layer 91 is welded and fixed on the inner wall of the housing 1, and the third rigid layer 90 is welded and fixed on the bearing bush 6. The above structural design can prevent vibration from being directly transmitted 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, and magnesium alloy plates.

[0056] When assembling the swash plate type plunger pump provided in this embodiment, the fourth rigid layer 91 bonded with the second rubber pad 921 in the second damping mechanism 9 can be first welded and fixed to the inner wall of the housing 1 (one end of the connecting rope 94 is fixedly installed on the fourth rigid layer 91 in advance), and then one end of the compression spring 93 is installed in the second positioning groove 9210 on the second rubber pad 921. The third rigid layer 90 bonded with the first rubber pad 920 is welded and fixed to the bearing bush 6, and then the first positioning groove 9200 on the third rigid layer 90 is aligned with the other end of the compression spring 93, and the other end of the connecting rope 94 is fixedly installed on the third rigid layer 90.

[0057] The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. Inclined plate type piston pump, including: A housing (1) is formed with a cavity and provided with a first axial hole; An end cover (2) is arranged on the housing (1) and is provided with a second axial hole (20); A main shaft (3) extending from the outside into the cavity and rotatably disposed on the housing (1) and the end cover (2) through the first shaft hole and the second shaft hole (20); A distribution plate (4), which is located in the cavity and is sleeved outside the main shaft (3) and is rotatably arranged relative to the main shaft (3); a swash plate (5), which is located in the cavity and sleeved outside the main shaft (3) and is rotatably arranged relative to the main shaft (3); and, A bearing bush (6) is arranged between the inner wall of the housing (1) and the swash plate (5), and the swash plate (5) is configured to be able to slide relative to the bearing bush (6) to adjust the inclination of the swash plate (5) relative to the main shaft (3); The invention is characterized in that the swash plate type piston pump further comprises a first vibration damping mechanism (8) and a second vibration damping mechanism (9), wherein the first vibration damping mechanism (8) is arranged between the distribution plate (4) and the inner wall of the end cover (2), and the second vibration damping mechanism (9) is arranged between the inner wall of the housing (1) and the bearing (6).

2. The swash plate type plunger pump according to claim 1, characterized in that: The first vibration damping mechanism (8) comprises a first rigid layer (82), a second rigid layer (83) and a first elastic layer (84) arranged between the first rigid layer (82) and the second rigid layer (83); the first vibration damping mechanism (8) is fixedly mounted on the inner wall of the end cover (2); the distribution plate (4) is fixedly mounted on the first vibration damping mechanism (8) and is in contact with the first rigid layer (82); The second vibration damping mechanism (9) comprises a third rigid layer (90), a fourth rigid layer (91) and a second elastic layer (92) arranged between the third rigid layer (90) and the fourth rigid layer (91); the second vibration damping mechanism (9) is arc-shaped and matched with the bearing shell (6); the second vibration damping mechanism (9) is fixedly mounted on the inner wall of the housing (1); the bearing shell (6) is fixedly mounted on the second vibration damping mechanism (9) and is in contact with the third rigid layer (90).

3. The swash plate type plunger pump according to claim 2, characterized in that: The inner wall of the end cover (2) is provided with a mounting groove (22), the mounting groove (22) surrounds the outside of the second axial hole (20) and the two are in communication, the first vibration damping mechanism (8) comprises an annular axial vibration damping portion (80), the axial vibration damping portion (80) is fixedly arranged in the mounting groove (22); The axial vibration damping portion (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 vibration damping portion (80) is provided with a through hole (802) adapted to the oil hole (40) on the distribution plate (4).

4. The swash plate type plunger pump according to claim 3, characterized in that: A second bearing (21) is disposed in the second shaft hole (20), and the main shaft (3) is rotatably disposed in the second shaft hole (20) via the second bearing (21); The first vibration damping mechanism (8) further comprises a cylindrical radial vibration damping portion (81), wherein the radial vibration damping portion (81) and the axial vibration damping portion (80) form an integral structure, and the radial vibration damping portion (81) is located between the outer ring wall of the second bearing (21) and the inner ring wall of the second shaft hole (20) along the radial direction of the main shaft (3).

5. The swash plate type plunger pump according to claim 3, characterized in that: A protrusion (41) is formed on a surface of the distribution disc (4) on one side facing the axial vibration damping portion (80); the distribution disc (4) is fitted with the axial vibration damping portion (80) via the protrusion (41); and the oil hole (40) of the distribution disc (4) is arranged to penetrate the protrusion (41) to reduce the contact area between the distribution disc (4) and the axial vibration damping portion (80).

6. The swash plate type plunger pump according to claim 3, characterized in that: The axial vibration damping portion (80) is formed with a connecting ear portion (800), and the connecting ear portion (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 vibration damping mechanism (8) are fixedly mounted on the bottom wall of the mounting groove (22) by screws passing through the first connecting hole (801) and the second connecting hole (42).

7. The swash plate type plunger pump according to any one of claims 2 to 6, characterized in that: The first elastic layer (84) is a rubber pad, and the two side surfaces 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 side surfaces of the second elastic layer (92) are respectively bonded and fixed to the third rigid layer (90) and the fourth rigid layer (91).

8. The swash plate type plunger pump according to any one of claims 2 to 6, characterized in that: The second elastic layer (92) comprises a first rubber pad (920) and a second rubber pad (921), wherein the first rubber pad (920) is bonded and fixed to a surface of the third rigid layer (90) facing the fourth rigid layer (91), and the second rubber pad (921) is bonded and fixed to a 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 vibration reduction mechanism (9) further comprises 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 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 within a set length so that the compression spring (93) is always in a compressed state.

9. The swash plate type plunger pump according to claim 8, characterized in that: The connecting rope (94) is arranged to pass through the compression spring (93).

10. The swash plate type plunger pump according to claim 8, 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 shell (1); and the third rigid layer (90) is welded and fixed to the bearing bush (6).

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