Ball cage type fluid end assembly

Abstract

The invention relates to the technical field of hydraulic transmission, and discloses a ball cage type fluid end assembly which comprises a shell, a liquid inlet pipe, a connecting seat, a plurality of liquid outlet channels and plunger bodies. A containing cavity is defined in the shell, the top end of the containing cavity communicates with the liquid inlet pipe, a connecting seat is fixedly connected to one side of the containing cavity, and the connecting seat is internally provided with the liquid outlet channels in the circumferential direction around the center, and the plunger bodies are connected into the liquid outlet channels in a sliding mode. The swash plate and the connecting base are oppositely arranged, a supporting plate is rotationally connected to the side, close to the connecting base, of the swash plate, a hydraulic balance assembly is arranged between the swash plate and the supporting plate, and the supporting plate is configured to sequentially act on the plunger bodies in the clockwise / anticlockwise direction so that the plunger bodies can reciprocate in the liquid outlet channel; the driving rod is rotationally connected to one side of the containing cavity and fixedly connected with the swash plate, a sealing seat is fixedly connected into the shell, the end, extending into the containing cavity, of the driving rod penetrates through the sealing seat, the driving rod is in sealed connection with the sealing seat, and a buffering assembly is arranged on the side, connected with the swash plate, of the sealing seat. The vibration force generated during hydraulic pumping can be effectively absorbed, and the influence of floating motion on a pump structure is reduced.

Description

Technical Field

[0001] This invention relates to the field of hydraulic transmission technology, and in particular to a ball cage type hydraulic end assembly. Background Technology

[0002] Hydraulic transmission technology is a crucial part of modern industry and a key component for providing power. Among them, the ball cage type axial swashplate hydraulic pump is a common type of pump and is widely used.

[0003] A swashplate hydraulic pump works by rotating a drive structure to rotate a swashplate, which in turn compresses a ball cage drive structure, causing several plunger heads to reciprocate. Liquid is pumped through an internal channel, and the direction of the liquid flow is controlled by a check valve. However, in existing technologies, both the swashplate and the ball cage drive structure are located within a transmission chamber, which is directly vented to the liquid. While rotation of the drive structure improves the sealing between the drive structure and the transmission chamber sidewalls compared to reciprocating motion, the reciprocating motion of the plunger pump means that the hydraulic force is directly fed back to the swashplate as the plunger pump pushes the liquid. This causes slight deformation and floating between the drive structure and the transmission chamber, and this floating process is accompanied by friction and wear, reducing the overall lifespan of the plunger pump. Therefore, a ball cage-type hydraulic end assembly is urgently needed to solve these problems. Summary of the Invention

[0004] The purpose of this invention is to provide a ball cage type hydraulic end assembly to solve the problems existing in the prior art, which can effectively absorb the vibration force generated during hydraulic pumping and reduce the impact of floating motion on the pump structure.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a ball-cage type hydraulic end assembly, comprising: The housing has an internally defined receiving cavity. The top of the receiving cavity is connected to a liquid inlet pipe. A connecting seat is fixed to one side of the receiving cavity. Several liquid outlet channels are circumferentially opened around the center of the connecting seat. A plunger body is slidably connected in the liquid outlet channels. A swashplate is rotatably connected within the receiving cavity and arranged opposite to the connecting seat. A support plate is rotatably connected to the side of the swashplate near the connecting seat, and a hydraulic balancing assembly is provided between the swashplate and the support plate. The support plate is configured to act on the plunger body sequentially in a clockwise / counterclockwise direction, so that the plunger body reciprocates within the liquid outlet channel. A drive rod is rotatably connected to one side of the receiving cavity and fixed to the swashplate. A sealing seat is fixed inside the housing. One end of the drive rod extends into the receiving cavity and passes through the sealing seat. The drive rod and the sealing seat are sealed and rotated. A buffer assembly is provided on the side of the sealing seat connected to the swashplate.

[0006] Preferably, the buffer component includes: The compression ring has a groove on the side of the sealing seat near the swash plate. The compression ring is rotated to the outer edge of the groove. A groove is formed inside the compression ring. The swash plate is embedded in the groove. The drive rod passes through the compression ring and is fixedly connected to the swash plate. A first sealing ring is disposed on the inner sidewall of the groove, and the portion of the extrusion ring extending into the groove slides in contact with the first sealing ring; The second sealing ring is disposed on the portion of the drive rod that passes through the sealing seat. The outer ring of the second sealing ring is fixedly connected to the sealing seat, and the inner ring of the second sealing ring is in sliding contact with the drive rod.

[0007] Preferred options also include: A cylindrical roller bearing is disposed in the groove, the cylindrical roller bearing is sleeved on the drive rod, the inner ring of the cylindrical roller bearing is fixedly connected to the drive rod, and the outer ring of the cylindrical roller bearing is fixedly connected to the sealing seat.

[0008] Preferably, the hydraulic balancing assembly includes: A distribution plate is fixed to the inclined side of the swashplate. The distribution plate rotates in the same direction as the swashplate. When the distribution plate rotates, it can form a conveying hydraulic force that is evenly distributed around the circumference of the swashplate. A ball bearing is disposed between the distribution plate and the support plate, and the support plate is connected to the distribution plate via the ball bearing; A limiting rod is fixed to the center of the distribution plate, and the end of the limiting rod away from the inclined plate passes through the center of the support plate. The limiting rod is connected to the support plate.

[0009] Preferably, the distribution plate includes a pair of circular plates, which are parallel and opposite to each other, and one of the circular plates is fixedly attached to the inclined side of the swashplate. A gap is provided between the pair of circular plates, and a plurality of guide plates are provided in the gap. The plurality of guide plates are distributed at equal intervals around the center of the circular plate, and a guide channel is defined between adjacent guide plates. The inner diameter of the guide channel gradually increases outward from the center of the circular plate.

[0010] Preferably, the guide plate has a rectangular structure, and the two ends of the guide plate are rounded.

[0011] Preferably, a plurality of ball cage seats are fixedly connected to the side of the support plate near the plunger body. The number of ball cage seats is the same as that of the plunger body and they correspond one-to-one. A ball groove is opened on the side of the ball cage seat near the plunger body. A small ball is fixedly connected to the side end face of the plunger body and the small ball rolls and fits in the ball groove.

[0012] Preferably, the plunger body has a through groove, one end of the plunger body located in the receiving cavity has a liquid inlet channel, and one end of the plunger body located in the liquid outlet channel has a liquid outlet channel. The two ends of the through groove are respectively connected to the liquid inlet channel and the liquid outlet channel, and a one-way valve is provided in the through groove.

[0013] Preferably, the liquid inlet pipe is positioned vertically directly above the small ball.

[0014] Preferably, a clamp is fitted and fixed to the outer periphery of the connection position between the housing and the connecting seat.

[0015] The present invention discloses the following technical effects: This invention allows liquid to flow through a receiving cavity via an inlet pipe and an outlet channel. A drive rod rotates a swashplate, and a support plate is connected to the side of the swashplate near the connecting seat. A hydraulic balancing assembly supports the support plate and the swashplate. As the swashplate rotates, it compresses the support plate, causing the support plate to successively compress several plungers in a clockwise / counterclockwise direction. This causes the plungers to reciprocate within the outlet channel. When the plungers move towards the receiving cavity, they draw liquid from the cavity. When the plungers move away from the outlet channel, they push the liquid to pump it. During the pumping process, the vibration force fed back to the plungers and support plate is balanced and absorbed by the hydraulic balancing assembly and a buffer assembly, effectively reducing the floating force acting on the drive rod and ensuring the sealing of the drive rod's rotational connection with the housing. Combined with the sealing seat for the sealed connection of the drive rod, the impact of floating motion on the pump structure is reduced. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the plunger body in this invention; Figure 2 This is a diagram showing the positional relationship between the feed pipe and the plunger body in this invention; Figure 3 This is a diagram showing the connection relationship between the housing and the connecting seat in this invention; Figure 4 This is a diagram showing the connection relationship between the ball bearing and the support disc in this invention; Figure 5 This is a diagram showing the connection relationship between the guide plate and the circular plate in this invention; Figure 6 This is a diagram showing the connection relationship between the cylindrical roller bearing and the sealing seat in this invention; The components are as follows: 1. Shell; 2. Inlet pipe; 3. Connecting seat; 4. Plunger body; 5. Swashplate; 6. Support plate; 7. Drive rod; 8. Sealing seat; 9. Extrusion ring; 10. First sealing ring; 11. Second sealing ring; 12. Cylindrical roller bearing; 13. Distribution plate; 14. Ball bearing; 15. Limiting rod; 16. Circular plate; 17. Guide plate; 18. Guide channel; 19. Ball cage seat; 20. Small ball; 21. Inlet channel; 22. Outlet channel; 23. Check valve; 24. Clamp; 25. Outlet channel; 26. Connecting rod. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Reference Figures 1-5 The present invention provides a ball cage type hydraulic end assembly, comprising: The housing 1 has an internally defined receiving cavity. The top of the receiving cavity is connected to a liquid inlet pipe 2. A connecting seat 3 is fixed to one side of the receiving cavity. Several liquid outlet channels 25 are opened around the center of the connecting seat 3. A plunger body 4 is slidably connected in the liquid outlet channel 25. Swashplate 5 is rotatably connected in the receiving cavity and arranged opposite to the connecting seat 3. A support plate 6 is rotatably connected to the side of swashplate 5 near the connecting seat 3, and a hydraulic balance component is provided between swashplate 5 and support plate 6. The support plate 6 is configured to act on the plunger body 4 in clockwise / counterclockwise directions to make the plunger body 4 reciprocate in the liquid outlet channel 25. The drive rod 7 is rotatably connected to one side of the receiving cavity and fixed to the swashplate 5. A sealing seat 8 is fixed inside the housing 1. One end of the drive rod 7 extends into the receiving cavity and passes through the sealing seat 8. The drive rod 7 and the sealing seat 8 are sealed and connected. A buffer assembly is provided on the side of the sealing seat 8 that is connected to the swashplate 5.

[0021] This invention allows liquid to flow through the receiving cavity via the inlet pipe 2 and the outlet channel 25. A drive rod 7 rotates the swashplate 5, and a support plate 6 is connected to the side of the swashplate 5 near the connecting seat 3. A hydraulic balancing assembly supports the support plate 6 and the swashplate 5. As the swashplate 5 rotates, it compresses the support plate 6, causing the support plate 6 to sequentially compress several plungers 4 in a clockwise / counterclockwise direction. This causes the plungers 4 to reciprocate within the outlet channel 25. When the plungers 4 move towards the receiving cavity, they draw liquid from the cavity. When the plungers 4 move away from the outlet channel 25, they push the liquid for pumping. During the pumping process, the vibration force fed back to the plungers 4 and the support plate 6 is balanced and absorbed by the hydraulic balancing assembly and the buffer assembly, effectively reducing the floating force acting on the drive rod 7 and ensuring the sealing of the drive rod 7's rotatable connection with the housing 1. Combined with the sealing seat 8 for the sealing connection of the drive rod 7, the impact of floating motion on the pump structure is reduced.

[0022] In this technical solution, the support plate 6 is connected to the plunger body 4 through a ball cage structure, forming a universal rotation of the plunger body 4 around the support plate 6. As the swash plate 5 squeezes the support plate 6, the support plate 6 tilts and successively squeezes and stretches the plunger body 4, forming the reciprocating motion of the plunger body 4 in the liquid outlet channel 25. The above-mentioned movement mode of the plunger body 4 is a conventional ball cage plunger pump design structure, which will not be described in detail.

[0023] Furthermore, the buffer component includes: The extrusion ring 9 and the sealing seat 8 have a groove on the side near the swash plate 5. The extrusion ring 9 is connected to the outer edge of the groove. The extrusion ring 9 has a groove inside. The swash plate 5 is embedded in the groove. The drive rod 7 passes through the extrusion ring 9 and is fixedly connected to the swash plate 5. The first sealing ring 10 is disposed on the inner side wall of the groove, and the part of the extrusion ring 9 that extends into the groove slides in contact with the first sealing ring 10. The second sealing ring 11 is disposed around the portion of the drive rod 7 that passes through the sealing seat 8. The outer ring of the second sealing ring 11 is fixedly connected to the sealing seat 8, and the inner ring of the second sealing ring 11 is in sliding contact with the drive rod 7.

[0024] By transferring the extrusion ring 9 onto the sealing seat 8 and setting a first sealing ring 10 in the connection area between the extrusion ring 9 and the sealing seat 8, the extrusion ring 9 and the sealing seat 8 are sealed and transferred. At the same time, a second sealing ring 11 is set at the position where the drive rod 7 passes through the sealing seat 8, and the drive rod 7 is sealed and transferred using the second sealing ring 11.

[0025] Specifically, in this technical solution, the first sealing ring 10 and the second sealing ring 11 adopt common sealing bearings, while the extrusion ring 9 is made of rubber. As the drive rod 7 is fixedly connected to the swash plate 5, and the swash plate 5 is embedded in the extrusion ring 9, the reaction force generated when pumping liquid acts on the swash plate 5, and the swash plate 5 extrudes the extrusion ring 9 to form a seal between the receiving cavity and the sealing seat 8, ensuring the sealing function, and effectively absorbing the floating force, reducing the wear between the drive rod 7 and the sealing seat 8.

[0026] Furthermore, it also includes: A cylindrical roller bearing 12 is disposed in a groove and sleeved on a drive rod 7. The inner ring of the cylindrical roller bearing 12 is fixedly connected to the drive rod 7, and the outer ring of the cylindrical roller bearing 12 is fixedly connected to a sealing seat 8.

[0027] By fixing the cylindrical roller bearing 12 in the groove, the drive rod 7 is rotatably connected to the sealing seat 8, and the sealing transition between the drive rod 7 and the sealing seat 8 is achieved by the joint cooperation of the compression ring 9, the first sealing ring 10 and the second sealing ring 11.

[0028] Furthermore, the hydraulic balancing assembly includes: The distribution plate 13 is fixed to the inclined side of the swash plate 5. The distribution plate 13 rotates in the same direction as the swash plate 5. When the distribution plate 13 rotates, it can form a conveying hydraulic force that is evenly distributed around the swash plate 5. A ball bearing 14 is disposed between the distribution plate 13 and the support plate 6, and the support plate 6 is connected to the distribution plate 13 via the ball bearing 14. The limiting rod 15 is fixed to the center of the distribution plate 13. The end of the limiting rod 15 away from the inclined plate 5 passes through the center of the support plate 6, and the limiting rod 15 is connected to the support plate 6.

[0029] By setting a distribution plate 13 between the swash plate 5 and the support plate 6, the distribution plate 13 is fixedly connected to the swash plate 5. When the swash plate 5 rotates, the distribution plate 13 forms a delivery fluid force distributed around the swash plate 5 in a circumferential direction, thereby effectively balancing the floating force transmitted to the swash plate 5 during the reciprocating motion of the plunger body 4. The distribution plate 13 is connected to the support plate 6 by a ball bearing 14, which prevents the support plate 6 from rotating synchronously with the swash plate 5 and damaging the structure of the plunger body 4. The limiting rod 15 can stably connect the support plate 6 and the distribution plate 13, realize the rotatable fixation of the support plate 6 and the swash plate 5, and ensure that the swash plate 5 effectively squeezes the support plate 6.

[0030] Furthermore, the distribution plate 13 includes a pair of circular plates 16, which are parallel and opposite to each other. One of the circular plates 16 is attached and fixed to the inclined side of the swashplate 5. A gap is provided between the pair of circular plates 16, and a plurality of guide plates 17 are provided in the gap. The plurality of guide plates 17 are distributed at equal intervals around the center of the circular plate 16, and a guide channel 18 is defined between two adjacent guide plates 17. The inner diameter of the guide channel 18 gradually increases outward from the center of the circular plate 16.

[0031] Specifically, a pair of circular plates 16 are arranged in parallel opposite directions, and several guide plates 17 are fixed between the pair of circular plates 16. The circular plate 16 near the swashplate 5 is attached and fixed to the swashplate 5, so that the swashplate 5 drives the circular plate 16 and several guide plates 17 to rotate synchronously during rotation. Since the two adjacent guide plates 17 cooperate to define the guide channel 18, and the inner diameter of the guide channel 18 gradually increases outward from the center of the circular plate 16, the several guide plates 17 cooperate to form an outward guiding and conveying effect along the guide channel 18 during the rotation of the circular plate 16. The distribution plate 13 rotates in the receiving cavity to generate a conveying force on the liquid. Through the reverse thrust transmitted by the liquid, the distribution plate 13 forms an axial hydraulic force on the swashplate 5, which balances the horizontal hydraulic force transmitted by the plunger body 4. During the rotation of the swashplate 5, the balancing force provided by the distribution plate 13 acts on the swashplate 5, thereby reducing the impact of floating motion on the swashplate 5 and the drive rod 7.

[0032] Furthermore, the deflector 17 has a rectangular structure, and the two ends of the deflector 17 are rounded.

[0033] By designing rounded corners at both ends of the guide plate 17, the effect of liquid flowing along the guide channel 18 during the rotation of the guide plate 17 is improved.

[0034] Furthermore, a number of ball cage seats 19 are fixedly connected to the side of the support plate 6 near the plunger body 4. The number of ball cage seats 19 is the same as that of the plunger body 4 and they correspond one-to-one. A ball groove is opened on the side of the ball cage seat 19 near the plunger body 4. A small ball 20 is fixedly connected to the side end face of the plunger body 4. The small ball 20 rolls and fits in the ball groove.

[0035] The plunger body 4 is fixedly connected to the ball 20 via the connecting rod 26.

[0036] Several ball cage seats 19 are fixed to the side wall of the support plate 6, and ball grooves are opened on the ball cage seats 19. Small balls 20 are rolled and engaged with the ball grooves to realize the universal rotation connection of the plunger body 4 relative to the support plate 6. As the swash plate 5 squeezes the support plate 6, the support plate 6 squeezes several plunger bodies 4 one after another. The connection between the plunger body 4 and the support plate 6 is maintained by the small balls 20 and the ball grooves, realizing the reciprocating motion of the plunger body 4 in the liquid outlet channel 25.

[0037] Furthermore, a through groove is provided inside the plunger body 4, an inlet channel 21 is provided at one end of the plunger body 4 located in the receiving cavity, and an outlet channel 22 is provided at one end of the plunger body 4 located in the outlet channel 25. The two ends of the through groove are connected to the inlet channel 21 and the outlet channel 22 respectively, and a one-way valve 23 is provided inside the through groove.

[0038] By opening a through groove with both ends inside the plunger body 4, when the plunger body 4 moves toward the receiving cavity, the hydraulic action opens the one-way valve 23, and the liquid flows out of the outlet channel 22 and is replenished through the inlet channel 21. When the plunger body 4 moves away from the receiving cavity, the one-way valve 23 closes the through groove, and the plunger body 4 forms a closed plunger head structure to push the liquid. In this way, the liquid is pumped by the reciprocating motion of the plunger body 4.

[0039] Furthermore, the liquid inlet pipe 2 is positioned vertically directly above the small ball 20.

[0040] Furthermore, a clamp 24 is fitted and fixed to the outer periphery of the connection position between the housing 1 and the connecting seat 3.

[0041] The housing 1 is tightly connected to the connecting seat 3 by clamp 24, and the liquid is transported to the receiving cavity from the liquid inlet pipe 2. With the rolling cooperation of the ball 20 and the ball groove, the reciprocating motion of the plunger body 4 is realized.

[0042] This invention provides a working principle for a ball-cage type hydraulic end assembly: Liquid is delivered into the receiving cavity through the inlet pipe 2. The drive rod 7 drives the swashplate 5 to rotate, and the swashplate 5 drives the distribution plate 13 to rotate. During the rotation of the distribution plate 13, the liquid in the receiving cavity flows through the guide channel 18 along the gap between a pair of circular plates 16, forming a circumferential outward hydraulic force around the swashplate 5. This allows the horizontal force generated by the plunger body 4 during reciprocating motion to be partially balanced by the lateral hydraulic flow force of the distribution plate 13, maintaining the rotational stability of the swashplate 5. At the same time, the residual hydraulic force acting on the swashplate 5 pushes the swashplate 5, causing the swashplate 5 and the sealing seat 8 to squeeze the extrusion ring 9 in opposite directions. This not only absorbs the residual hydraulic force but also improves the sealing effect of the extrusion ring 9 on the sealing seat 8. Combined with the first sealing ring 10 and the second sealing ring 11, the connection gap between the drive rod 7 and the sealing seat 8 is sealed, effectively reducing the vibration impact on the pump structure caused by the floating of the plunger body 4.

[0043] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0044] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A ball cage type fluid end assembly characterized by, The utility model relates to a kind of hydraulic pump, including: Shell (1), inside is defined with containing cavity, the top end of the containing cavity is communicated with liquid inlet pipe (2), one side of the containing cavity is fixedly connected with connecting seat (3), a plurality of liquid outlet passages (25) are opened in the connecting seat (3) around center circumferentially, plunger body (4) is slidably connected in the liquid outlet passage (25); Swash plate (5), rotationally connected in the containing cavity and with the connecting seat (3) opposite arrangement, the side of the swash plate (5) close to the connecting seat (3) is rotatably connected with support disc (6), and liquid force balance assembly is arranged between the swash plate (5) and support disc (6), the support disc (6) is configured to sequentially act on the plunger body (4) along clockwise / inverse clockwise, so that the plunger body (4) reciprocates in the liquid outlet passage (25); Drive rod (7), rotationally connected in one side of the containing cavity and with the swash plate (5) fixedly connected, the shell (1) is fixedly connected with sealing seat (8), one end of the drive rod (7) extending into the containing cavity penetrates the sealing seat (8), the drive rod (7) is rotatably connected with the sealing seat (8), and the side, connected with the swash plate (5) of the sealing seat (8), is provided with buffer assembly.

2. The ball cage hydrodynamic end assembly of claim 1, wherein: The buffer assembly includes: Extrusion ring (9), the side of the sealing seat (8) close to the swash plate (5) is provided with recess, the extrusion ring (9) is rotatably connected on the outer edge of the recess, the recess is embedded in the extrusion ring (9), the swash plate (5) is embedded in the recess, and the drive rod (7) penetrates the extrusion ring (9) and is fixedly connected with the swash plate (5); First sealing ring (10), annularly arranged on the inner side wall of the recess, the portion of the extrusion ring (9) extending into the recess is in sliding contact with the first sealing ring (10); Second sealing ring (11), annularly arranged on the portion of the drive rod (7) penetrating the sealing seat (8), the outer ring side of the second sealing ring (11) is fixedly connected with the sealing seat (8), and the inner ring side of the second sealing ring (11) is in sliding contact with the drive rod (7).

3. The ball cage hydrodynamic end assembly of claim 2, wherein, Further including: Cylindrical roller bearing (12) is arranged in the recess, the cylindrical roller bearing (12) is sleeved on the drive rod (7), the inner ring of the cylindrical roller bearing (12) is fixedly connected with the drive rod (7), and the outer ring of the cylindrical roller bearing (12) is fixedly connected with the sealing seat (8).

4. The ball cage hydrodynamic end assembly of claim 1, wherein, The liquid force balance assembly includes: Flow distribution disc (13), fixedly connected on the inclined side of the swash plate (5), the flow distribution disc (13) is in the same direction of rotation with the swash plate (5), and when the flow distribution disc (13) rotates, the flow distribution disc (13) can form the delivery liquid force effect around the swash plate (5) circumferentially equidistantly distributed; Ball bearing (14), arranged between the flow distribution disc (13) and the support disc (6), the support disc (6) is rotatably connected with the flow distribution disc (13) through the ball bearing (14); A limiting rod (15) is fixed at the center of the distribution disc (13), and one end of the limiting rod (15) away from the swash plate (5) penetrates the center of the support disc (6), and the limiting rod (15) is connected with the support disc (6).

5. The ball cage hydrodynamic end assembly of claim 4, wherein: The distribution disc (13) comprises a pair of circular plates (16), and the circular plates (16) are distributed in parallel and opposite directions, and one of the circular plates (16) is fixedly connected with the inclined side surface of the swash plate (5), and a gap is arranged between the circular plates (16), and a plurality of guide plates (17) are arranged in the gap, the guide plates (17) are distributed in a circumferential direction at equal intervals around the center of the circular plate (16), and a guide channel (18) is defined between adjacent guide plates (17).

6. The ball cage hydrodynamic end assembly of claim 5, wherein: The guide plate (17) is a rectangular structure, and the two ends of the guide plate (17) are circularly transitioned.

7. The ball cage hydrodynamic end assembly of claim 1, wherein: A plurality of ball cage seats (19) are fixedly connected to one side of the support disc (6) close to the plunger body (4), the ball cage seats (19) are the same in number as the plunger body (4) and one-to-one corresponding, a ball groove is formed in one side of the ball cage seat (19) close to the plunger body (4), and a small ball (20) is fixedly connected to the side end surface of the plunger body (4) and is rollingly matched in the ball groove.

8. The ball cage hydrodynamic end assembly of claim 1, wherein: A through groove is formed in the plunger body (4), a liquid inlet channel (21) is formed in one end of the plunger body (4) located in the containing cavity, a liquid outlet channel (22) is formed in one end of the plunger body (4) located in the liquid outlet channel (25), the two ends of the through groove are communicated with the liquid inlet channel (21) and the liquid outlet channel (22) respectively, and a one-way valve (23) is arranged in the through groove.

9. The ball cage hydrodynamic end assembly of claim 7, wherein: The liquid inlet pipe (2) is arranged vertically above the small ball (20).

10. The ball cage hydrodynamic end assembly of claim 1, wherein: A clamp (24) is fixedly connected to the outer circumferential side of the connection position of the shell (1) and the connecting seat (3).

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