Auxiliary mechanism of axial plunger pump return plate

Abstract

The invention relates to the technical field of axial plunger pumps, in particular to an auxiliary mechanism for a return plate of an axial plunger pump, and adopts the technical scheme that the auxiliary mechanism comprises the return plate and a driving shaft, the return plate is mounted in the middle of the driving shaft, and a first clamping shell and a second clamping shell are mounted on the outer side of the return plate; a high-load rolling structure is installed between the edge of the return plate and the first clamping shell and between the edge of the return plate and the second clamping shell, a linkage sealing structure is installed on the side, close to the first clamping shell, of the return plate, and a supporting structure is installed on the side, away from the return plate, of the second clamping shell. The pump has the beneficial effects that sliding friction between the edge of the return plate and the inner wall of the pump shell is converted into rolling friction through the high-load rolling structure, and the supporting structure is combined to support the inclined face of the return plate, so that the effect of relieving abrasion of the edge of the return plate is achieved; through the linkage sealing structure, the joint of the plunger and the return plate is sealed and wrapped, so that the effects that lubricating oil in the sealing kit fully lubricates the contact surface and the friction force of the joint is reduced are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of axial piston pumps, and in particular to an auxiliary mechanism of a return disc of an axial piston pump. Background Art

[0002] The axial piston pump is a common type of hydraulic pump, widely used in hydraulic systems. Its basic structure includes one or more plungers, a plunger sleeve, a return plate (or swash plate), a pump body and other components. The working principle of the axial piston pump is that the rotating drive shaft drives the plunger inside the pump to reciprocate in the axial direction, so that the liquid is sucked into the pump chamber and discharged through the discharge hole. The return plate is a key component inside the pump. It is used to control the return process of the plunger. During the working cycle of the pump, the return plate brings the plunger from the compression area of ​​the working chamber back to the oil suction area to prepare for the next oil suction and pressurization process.

[0003] Since the return plate of the axial piston pump is in a tilted state all year round, it is subject to greater friction and pressure. The existing return plate is usually in direct contact with the inner wall of the pump casing and the plunger. Therefore, during long-term operation, wear of the return plate is inevitable. Specifically, the wear of the return plate has the following characteristics:

[0004] 1. The area connecting the return plate and the plunger is usually the most severely worn area. Because the return plate must withstand the friction generated by the plunger during the return stroke, this friction will cause the connection between the return plate surface and the plunger to gradually wear over time. Moreover, the lack of a sealing structure at the connection between the return plate and the plunger prevents the lubricant from effectively lubricating the contact surface, which leads to increased friction and makes it difficult to dissipate the heat generated during the friction. The temperature increase not only exacerbates the wear of the return plate, but may also affect the performance of the lubricant and even cause oxidation and degradation of the oil, further reducing the efficiency and reliability of the system.

[0005] 2. The edge of the return plate, especially the part that contacts the pump housing or other accessories, is also a hot spot for wear. Because the return plate is inclined, the edge often bears lateral pressure from the plunger and other components. Such areas may wear more severely due to uneven loads.

[0006] Therefore, it is necessary to invent an auxiliary mechanism for the return disc of the axial piston pump. Summary of the Invention

[0007] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: an auxiliary mechanism of the return disc of an axial piston pump, comprising a return disc and a drive shaft, the return disc being installed in the middle of the drive shaft, a plunger sleeve being fixedly installed at one end of the drive shaft, a plunger being slidably installed in the plunger sleeve, a first clamp shell and a second clamp shell being installed on the outer side of the return disc, the first clamp shell and the second clamp shell being installed on the inner wall of the plunger pump housing, a high-load rolling structure being installed between the edge of the return disc and the first clamp shell and the second clamp shell, the high-load rolling structure comprising a first columnar ball and a second columnar ball, a linkage sealing structure being installed on the side of the return disc close to the first clamp shell, the linkage sealing structure being used to seal the connection between the plunger and the return disc, the linkage sealing structure comprising a sealing kit, lubricating oil being injected into the sealing kit, a support structure being installed on the side of the second clamp shell away from the return disc, the support structure comprising a support member, and the support member being fixedly installed on the inner wall of the plunger pump housing.

[0008] Preferably, side slopes are provided on both side edges of the return disk, V-shaped grooves are provided on the side of the first clamp shell and the second clamp shell close to the return disk, connecting rings are installed on the outer walls of the first clamp shell and the second clamp shell, and a first bolt is installed on the connecting ring of the first clamp shell and the second clamp shell.

[0009] Preferably, the high-load rolling structure includes a gasket, which is arranged on the outside of the return disc and installed between the first clamping shell and the second clamping shell, and has concave inclined surfaces on both sides of the gasket.

[0010] Preferably, several of the first columnar balls are arranged and installed between the V-shaped groove of the second housing, the side slope of the return plate and the inner concave slope of the gasket, and several of the second columnar balls are arranged and installed between the V-shaped groove of the first housing, the side slope of the return plate and the inner concave slope of the gasket.

[0011] Preferably, the return disk surface is provided with a disk opening, and the linkage closed structure includes a kit holder, the kit holder is installed in the disk opening, the kit holder is installed with a joint kit at one end close to the plunger sleeve, and the plunger is installed with a spherical joint at one end close to the return disk, and the spherical joint is rotatably installed in the joint kit.

[0012] Preferably, a gap is provided between the end of the kit holder close to the plunger sleeve and the disk opening, the sealing kit is sleeved and installed on the end of the plunger provided with a spherical joint, and the end of the sealing kit away from the disk opening extends into the gap between the kit holder and the disk opening.

[0013] Preferably, the linked closed structure includes a backplate, which is installed on the side of the return disk close to the second clamping shell. A through hole is provided in the middle of the backplate, and a threaded hole is provided on the backplate. A second bolt is installed in the threaded hole, and the second bolt passes through the threaded hole to be connected to the kit holder.

[0014] Preferably, the support structure includes a swivel, which is rotatably mounted on the side of the second housing away from the return disk. A through hole is provided in the middle of the swivel, a swivel seat is mounted on the surface of the swivel, a support member is rotatably mounted on the swivel seat, and the bottom of the support member is fixedly connected to the inner wall of the plunger pump housing.

[0015] Preferably, a central through hole is provided in the middle of the return disc, a terminal connection surface is provided in the middle of the drive shaft, the terminal connection surface portion of the drive shaft passes through the central through hole, and a motor is installed and connected to one end of the drive shaft.

[0016] The beneficial effects of the present invention are as follows: when the drive shaft drives the return plate to rotate, the sliding friction between the edge of the return plate and the inner wall of the pump casing is converted into rolling friction through the first columnar ball and the second columnar ball in the high-load rolling structure, and the first columnar ball and the second columnar ball are arranged in a cross-overlapping structure, which has a strong bearing capacity in both the horizontal and vertical directions. At the same time, the bottom of the inclined surface of the return plate is supported by the support structure to achieve the effect of alleviating the wear of the edge part of the return plate, especially the wear of the edge part on the downward inclined side, effectively avoiding the situation where the edge of the return plate is severely worn due to uneven load; on the other hand, through the sealing kit in the linked closed structure, the connection between the plunger and the return plate is sealed and wrapped, so that the lubricating oil in the sealing kit can fully lubricate the contact surface and reduce the friction at the connection, so that the heat generated during the friction process can be quickly dissipated, effectively alleviating the wear of the return plate, and further improving the working efficiency and reliability of the plunger pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional structural diagram provided by the present invention;

[0018] Figure 2 A cross-sectional view of the plunger sleeve provided by the present invention;

[0019] Figure 3 A cross-sectional view of a first jacket provided by the present invention;

[0020] Figure 4 The overall exploded view provided by the present invention;

[0021] Figure 5 A side view schematic diagram of the structure provided by the present invention;

[0022] Figure 6 A schematic diagram of the internal structure of the first and second shells provided by the present invention;

[0023] Figure 7 A schematic diagram of the interior of the gasket provided by the present invention;

[0024] Figure 8 A cross-sectional view of the return disc provided by the present invention;

[0025] Figure 9 A schematic diagram of the internal structure of the return disk provided by the present invention;

[0026] Figure 10 A cross-sectional view of the linkage closed structure provided by the present invention;

[0027] Figure 11 A schematic diagram of the linkage and closed structure provided by the present invention;

[0028] Figure 12 A schematic diagram of the arrangement of balls provided by the present invention;

[0029] Figure 13 Detailed diagram of the return tray provided by the present invention;

[0030] Figure 14 A cross-sectional view of the return disc provided by the present invention;

[0031] Figure 15 Detailed diagram of the linkage and closed structure provided by the present invention.

[0032] In the figure: return disk 111, side inclined surface 112, disk opening 113, central through hole 114, drive shaft 121, terminal connection surface 122, plunger 131, spherical joint 132, plunger sleeve 14, first clamping shell 151, second clamping shell 152, gasket 153, first cylindrical ball 154, second cylindrical ball 155, first bolt 156, swivel 161, swivel seat 162, support member 163, backing plate 171, kit holder 172, joint kit 173, sealing kit 174, second bolt 175. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0034] Example 1, as Figures 1-6 and Figure 12As shown, the auxiliary mechanism of the return plate of the axial piston pump in the embodiment of the first aspect of the present invention includes a return plate 111 and a drive shaft 121. The return plate 111 is installed in the middle of the drive shaft 121. A plunger sleeve 14 is fixedly installed at one end of the drive shaft 121. A plunger 131 is slidably installed in the plunger sleeve 14. A first clamping shell 151 and a second clamping shell 152 are installed on the outside of the return plate 111. The first clamping shell 151 and the second clamping shell 152 are installed on the inner wall of the piston pump housing. A high-load rolling structure is installed, and the high-load rolling structure includes a first columnar ball 154 and a second columnar ball 155. A linkage sealing structure is installed on the side of the return disk 111 close to the first clamping shell 151, which is used to seal the connection between the plunger 131 and the return disk 111. The linkage sealing structure includes a sealing kit 174, and lubricating oil is injected into the sealing kit 174. A support structure is installed on the side of the second clamping shell 152 away from the return disk 111. The support structure includes a support member 163, and the support member 163 is fixedly mounted on the inner wall of the plunger pump housing.

[0035] In the above embodiment, it should be noted that the drive shaft 121 is externally connected to the motor and the control system, and a plurality of pump chambers are provided in the plunger sleeve 14. A plunger 131 is slidably mounted in each pump chamber. By starting the drive shaft to rotate the return disk 111, the return disk 111 drives the plunger 131 in the pump to reciprocate in the plunger sleeve 14, so that the liquid is sucked into the pump chamber and discharged through the discharge hole.

[0036] When the drive shaft is started to drive the return plate 111 to rotate, the sliding friction between the edge of the return plate and the inner wall of the pump casing is converted into rolling friction through the first columnar roller 154 and the second columnar ball 155 in the high-load rolling structure. The first columnar roller 154 and the second columnar ball 155 are arranged in a cross-overlapping structure, which has a strong bearing capacity in both the horizontal and vertical directions. At the same time, the support structure supports the bottom of the inclined surface of the return plate 111 to achieve the effect of alleviating the wear of the edge portion of the return plate 111, especially the wear of the edge portion on the downward inclined side, effectively avoiding the situation where the edge of the return plate is severely worn due to uneven load;

[0037] On the other hand, by linking the sealing kit 174 in the closed structure, the connection between the plunger 131 and the return disk 111 is sealed and wrapped, so that the lubricating oil in the sealing kit 174 can fully lubricate the contact surface and reduce the friction at the connection, so that the heat generated during the friction process can be quickly dissipated, effectively alleviating the wear of the return disk 111, and further improving the working efficiency and reliability of the plunger pump system.

[0038] The upper and lower sides of the second clamping shell 152 are connected to a linkage device extending to the outside of the plunger pump housing. The linkage device should originally be connected to the upper and lower sides of the return plate 111 for adjusting the tilt angle of the return plate 111. It belongs to the existing structural technology and is now connected to the upper and lower sides of the second clamping shell 152. By driving the second clamping shell 152 to deflect, the return plate 111 inside it is driven to tilt.

[0039] Example 2, as Figure 3-Figure 12 and Figure 14 As shown, the auxiliary mechanism of the return plate of the axial piston pump includes embodiment 1. In addition, the edges of the return plate 111 are provided with side bevels 112, the first clamping shell 151 and the second clamping shell 152 are provided with V-shaped grooves on the side close to the return plate 111, the outer walls of the first clamping shell 151 and the second clamping shell 152 are installed with connecting rings, and the connecting rings of the first clamping shell 151 and the second clamping shell 152 are installed with first bolts 156. The high-load rolling structure includes a gasket 153, the gasket 153 It is arranged on the outside of the return disk 111, and the gasket 153 is installed between the first clamping shell 151 and the second clamping shell 152. Concave inclined surfaces are provided on both sides of the gasket 153. A number of first columnar balls 154 are arranged and installed between the V-shaped groove of the second clamping shell 152, the side inclined surface 112 of the return disk 111 and the concave inclined surface of the gasket 153. A number of second columnar balls 155 are arranged and installed between the V-shaped groove of the first clamping shell 151, the side inclined surface 112 of the return disk 111 and the concave inclined surface of the gasket 153.

[0040] In the above embodiment, it should be noted that the first cylindrical balls 154 are arranged in a cross-wise manner and filled between the V-shaped groove of the second clamping shell 152, the side inclined surface 112 of the return plate 111, and the concave inclined surface of the backing ring 153. The second cylindrical balls 155 are arranged in a cross-wise manner and filled between the V-shaped groove of the first clamping shell 151, the side inclined surface 112 of the return plate 111, and the concave inclined surface of the backing ring 153. The cylindrical balls 154 and the second cylindrical balls 155 are arranged in a cross-wise manner in two directions, which can withstand bidirectional radial and axial loads.

[0041] A certain amount of lubricating oil is injected into the V-shaped grooves of the first and second clamping shells 151, 152 to reduce the friction between the first and second cylindrical balls 154, 155 and the inner wall of the grooves. The first and second clamping shells 151, 152 are fixedly connected and mounted on the outer side of the return plate 111 by first bolts 156.

[0042] When the drive shaft 121 drives the return disk 111 to rotate, the side inclined surfaces 112 set on both sides of the return disk 111 drive the first columnar ball 154 and the second columnar ball 155 to continuously roll in the V-shaped groove of the first clamping shell 151 and the V-shaped groove of the second clamping shell 152 respectively, so as to achieve the effect of reducing the wear of the edge part of the return disk 111.

[0043] Example 3, as Figure 3 、 Figure 4 、 Figures 6-11 and Figure 13-15 As shown, the auxiliary mechanism of the return disk of the axial piston pump includes embodiment 1. In addition, a disk opening 113 is provided on the surface of the return disk 111, and the linkage closed structure includes a kit card seat 172, which is installed in the disk opening 113. The end of the kit card seat 172 close to the plunger sleeve 14 is installed with a joint kit 173, and the end of the plunger 131 close to the return disk 111 is installed with a spherical joint 132. The spherical joint 132 is rotatably installed in the joint kit 173, and the end of the kit card seat 172 close to the plunger sleeve 14 is connected to the disk opening 113. A gap is provided between the two ends of the piston 131, and the sealing kit 174 is sleeved and installed on the end of the piston 131 with the spherical joint 132. The end of the sealing kit 174 away from the disk opening 113 extends into the gap between the kit holder 172 and the disk opening 113. The linkage closed structure includes a back plate 171, and the back plate 171 is installed on the side of the return disk 111 close to the second clamping shell 152. A through hole is provided in the middle of the back plate 171, and a threaded hole is provided on the back plate 171. A second bolt 175 is installed in the threaded hole. The second bolt 175 passes through the threaded hole and is connected to the kit holder 172.

[0044] In the above embodiment, it should be noted that the return plate 111 is rotatably connected to the plunger 131 through the kit holder 172, the joint kit 173 and the spherical joint 13, and the spherical joint 13 rotates within the joint kit 173 to achieve the effect of adjusting the angle between the return plate 111 and the plunger 131;

[0045] The disk opening 113 on the surface of the return disk 111 passes through the return disk 111. The inner wall of the end of the disk opening 113 close to the plunger sleeve 14 is provided with a spherical surface. The end of the kit holder 172 close to the plunger sleeve 14 is also provided with a spherical shell. The diameter of the spherical shell of the kit holder is smaller than the inner diameter of the spherical surface of the plunger sleeve 14, and the gap between the kit holder 172 and the disk opening 113 is also a curved surface structure. The end of the sealing kit 174 inserted into the gap is provided with a shape that can adapt to the inner diameter of the spherical surface of the plunger sleeve 14. Due to the curved surface structure of the inner wall of the gap, the plunger 131 drives the spherical joint 132 to rotate in the joint kit 173. At the same time, the plunger 131 drives the sealing kit 174 to deflect in the gap between the kit holder 172 and the disk opening 113. This allows the sealing kit 174 to achieve the effect of linking the sealing kit holder 172, the joint kit 173, and the spherical joint 132, so that the lubricating oil is evenly distributed among the kit holder 172, the joint kit 173, and the spherical joint 132.

[0046] The installation steps of the linked sealed structure and the plunger 131 are as follows: first insert the sealing kit 174 into one end of the disk opening 113, and then insert the kit holder 172 from the other end of the disk opening 113, so that the kit holder 172 and the inner wall of the disk opening 113 clamp the sealing kit 174, then extend the joint kit 173 from one end of the sealing kit 174 and fix it to the front end of the kit holder 172, and then insert the plunger 131 into the sealing kit 174 so that the spherical joint 132 on the plunger 131 is stuck in the joint kit 173, and finally cover the back plate 171 on the back of the return disk 111, and install the second bolts 175 in the threaded holes of the back plate 171 in turn, so that the second bolts 175 pass through the threaded holes and are tightly connected to the kit holder 172.

[0047] Example 4, as Figures 4-10 、 Figure 12 and Figure 13 As shown, the auxiliary mechanism of the return plate of the axial piston pump includes embodiment 3. In addition, the supporting structure includes a swivel 161, which is rotatably mounted on the side of the second clamping shell 152 away from the return plate 111. A through hole is provided in the middle of the swivel 161, and a swivel seat 162 is mounted on the surface of the swivel 161. A support member 163 is rotatably mounted on the swivel seat 162, and the bottom of the support member 163 is fixedly connected to the inner wall of the piston pump housing.

[0048] In the above embodiment, it should be noted that the second clamping shell 15 is supported by the support member 163, the swivel seat 162 and the swivel ring 161, so that the second clamping shell 15 supports the return plate 111, so as to achieve the effect of supporting the bottom of the inclined surface of the return plate 111 and alleviating the wear of the edge portion of the downward inclined side.

[0049] Example 5, as Figure 4 and Figure 7-14 As shown, the auxiliary mechanism of the return plate of the axial piston pump includes embodiment 4. In addition, a central through hole 114 is provided in the middle of the return plate 111, and a terminal connection surface 122 is provided in the middle of the drive shaft 121. The terminal connection surface 122 of the drive shaft 121 partially passes through the central through hole 114, and a motor is installed and connected at one end of the drive shaft 121.

[0050] In the above embodiment, it should be noted that the return disk 111 is rotatably mounted on the terminal connection surface 122 of the drive shaft 121 through the central through hole 114, and the drive shaft 121 passes through the middle through hole of the swivel 161, the middle through hole of the back plate 171, the central through hole 114 and the middle of the first clamping shell 151 in sequence and is fixedly connected to the plunger sleeve 14.

[0051] The use process of the present invention is as follows: a person skilled in the art starts the drive shaft to drive the return disc 111 to rotate, and the return disc 111 drives the plunger 131 in the pump to do reciprocating motion in the plunger sleeve 14, so that the liquid is sucked into the pump chamber and discharged through the discharge hole. While the return disc 111 rotates, the side inclined surfaces 112 set on the edges of the return disc 111 on both sides drive a columnar ball 154 and a second columnar ball 155 to continuously roll in the V-shaped groove of the first clamping shell 151 and the V-shaped groove of the second clamping shell 152 respectively, and the sliding friction between the edge of the return disc 111 and the inner wall of the pump shell is converted into rolling friction, and the first columnar ball 154 and the second columnar ball 155 are arranged in a cross-overlapping structure, which has a strong bearing capacity in both the horizontal and vertical directions. The second clamping shell 15 is supported by the support member 163, the swivel seat 162 and the swivel ring 161, so that the second clamping shell 15 supports the bottom of the inclined surface of the return disk 111 to alleviate the wear of the edge portion of the return disk 111; on the other hand, the rotation of the return disk 111 will cause the plunger 131 to drive the spherical joint 132 to rotate in the joint kit 173, and at the same time, the plunger 131 will drive the sealing kit 174 to deflect in the gap between the kit seat 172 and the disk opening 113, so that the sealing kit 174 can achieve the effect of linking the sealing kit seat 172, the joint kit 173 and the spherical joint 132, so that the lubricating oil is evenly distributed among the kit seat 172, the joint kit 173 and the spherical joint 132 and the friction at the connection is reduced.

[0052] The above description is merely a preferred embodiment of the present invention. Anyone skilled in the art may utilize the above-described technical solutions to modify the present invention or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement based on the technical solution of the present invention falls within the scope of protection claimed by the present invention.

Claims

1. An auxiliary mechanism for a return disk of an axial piston pump, comprising a return disk (111) and a drive shaft (121), wherein the return disk (111) is mounted in the middle of the drive shaft (121), a plunger sleeve (14) is fixedly mounted on one end of the drive shaft (121), and a plunger (131) is slidably mounted in the plunger sleeve (14), characterized in that: A first clamping shell (151) and a second clamping shell (152) are installed on the outer side of the return disc (111). The first clamping shell (151) and the second clamping shell (152) are installed on the inner wall of the plunger pump housing. A high-load rolling structure is installed between the edge of the return disc (111) and the first clamping shell (151) and the second clamping shell (152). The high-load rolling structure includes a first columnar ball (154) and a second columnar ball (155). A linkage sealing structure is installed on the side of the return disc (111) close to the first clamping shell (151). The linkage sealing structure is used to seal the connection between the plunger (131) and the return disc (111). Lubricating oil is injected into the sealing kit (174). A support structure is installed on the side of the second clamping shell (152) away from the return disc (111). The support structure includes a support member (163). The support member (163) is fixedly installed on the inner wall of the plunger pump housing.

2. The auxiliary mechanism of the return plate of the axial piston pump according to claim 1, characterized in that: Side slopes (112) are provided on both side edges of the return disc (111); a V-shaped groove is provided on one side of the first clamp shell (151) and the second clamp shell (152) close to the return disc (111); connecting rings are installed on the outer walls of the first clamp shell (151) and the second clamp shell (152); and a first bolt (156) is installed on the connecting ring of the first clamp shell (151) and the second clamp shell (152).

3. The auxiliary mechanism of the return plate of the axial piston pump according to claim 2, characterized in that: The high-load rolling structure comprises a gasket (153) which is arranged outside the return disc (111) and installed between the first clamping shell (151) and the second clamping shell (152). Both sides of the gasket (153) are provided with concave inclined surfaces.

4. The auxiliary mechanism of the return plate of the axial piston pump according to claim 3, characterized in that: A plurality of the first columnar balls (154) are arranged and installed between the V-shaped groove of the second clamping shell (152), the side inclined surface (112) of the return plate (111) and the concave inclined surface of the backing ring (153); and a plurality of the second columnar balls (155) are arranged and installed between the V-shaped groove of the first clamping shell (151), the side inclined surface (112) of the return plate (111) and the concave inclined surface of the backing ring (153).

5. The auxiliary mechanism of the return plate of the axial piston pump according to claim 1, characterized in that: The return disk (111) is provided with a disk opening (113) on its surface. The linkage closed structure comprises a kit holder (172). The kit holder (172) is installed in the disk opening (113). A joint kit (173) is installed at one end of the kit holder (172) close to the plunger sleeve (14). A spherical joint (132) is installed at one end of the plunger (131) close to the return disk (111). The spherical joint (132) is rotatably installed in the joint kit (173).

6. The auxiliary mechanism of the return plate of the axial piston pump according to claim 5, characterized in that: A gap is provided between the end of the kit holder (172) close to the plunger sleeve (14) and the disk surface opening (113); the sealing kit (174) is sleeved and mounted on the end of the plunger (131) provided with a spherical joint (132); and the end of the sealing kit (174) away from the disk surface opening (113) extends into the gap between the kit holder (172) and the disk surface opening (113).

7. The auxiliary mechanism of the return plate of the axial piston pump according to claim 6, characterized in that: The linkage closed structure includes a back plate (171), which is installed on a side of the return disk (111) close to the second clamping shell (152). A through hole is provided in the middle of the back plate (171), and a threaded hole is provided on the back plate (171). A second bolt (175) is installed in the threaded hole, and the second bolt (175) passes through the threaded hole and is connected to the kit base (172).

8. The auxiliary mechanism for the return plate of the axial piston pump according to claim 7, characterized in that: The support structure comprises a rotating ring (161), the rotating ring (161) being rotatably mounted on a side of the second clamping shell (152) away from the return disk (111), a through hole being provided in the middle of the rotating ring (161), a rotating seat (162) being mounted on the surface of the rotating ring (161), a supporting member (163) being rotatably mounted on the rotating seat (162), and a bottom of the supporting member (163) being fixedly connected to the inner wall of the plunger pump housing.

9. The auxiliary mechanism of the return plate of the axial piston pump according to claim 8, characterized in that: A central through hole (114) is provided in the middle of the return disc (111), a terminal connection surface (122) is provided in the middle of the drive shaft (121), a portion of the terminal connection surface (122) of the drive shaft (121) passes through the central through hole (114), and a motor is installed and connected to one end of the drive shaft (121).

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