An axial piston pump with a main shaft driving a tilting cylinder assembly at constant speed

Abstract

This invention discloses an axial piston pump with a main shaft driven at a constant velocity to rotate an inclined cylinder assembly. The pump includes a pump body, a main shaft, a turntable on the main shaft, ball joints, and a cylinder mounted on the outer side of each ball joint. A piston mechanism is located between the cylinder and the turntable. A distribution plate is located on the outer side of the cylinder, and inlet / outlet flow channels are located inside the pump body. Multiple curved groove raceways or multiple straight groove raceways are located on the outer surface of the ball joints. Corresponding raceways are provided between the cylinder and the multiple curved groove raceways or multiple straight groove raceways. Torque is transmitted through the rolling contact of balls within the raceways, forming a fixed or telescopic ball cage type constant velocity universal joint transmission mechanism, achieving constant velocity drive of the inclined cylinder rotation by the main shaft. Because the components at both ends of the piston, namely the turntable and the cylinder, rotate at completely equal and synchronous speeds, the "floating" motion of the float in a float pump can be effectively solved, making the internal rotating components operate more stably under high-speed driving conditions and reducing friction and wear problems.

Description

Technical Field

[0001] This invention relates to the field of hydraulic transmission technology, specifically to an axial piston pump that uses a main shaft to drive a tilting cylinder assembly at a constant speed. Background Technology

[0002] Hydraulic transmission technology plays a crucial role in modern industry, especially in the construction machinery sector, where most construction machinery relies on it. The hydraulic pump, as one of the core components of a hydraulic system, is a key component providing power. The swashplate axial piston pump is a common pump type in construction machinery hydraulic systems due to its wide range of applications.

[0003] With the global pursuit of the "dual carbon goals"—reducing carbon emissions and achieving carbon neutrality—fluid power technology faces new opportunities and challenges. The construction machinery industry is transitioning from traditional internal combustion engines to electric new energy sources. This transition places new technological demands on swashplate axial piston pumps in hydraulic systems, posing a challenge to technological innovation for traditional pump types.

[0004] The float cup pump is a new type of axial piston pump invented by INNAS in the Netherlands in recent years. It expands the number of pistons in the pump to 24, significantly reducing the pump's flow pulsation, pressure pulsation, and vibration noise, but it also brings new problems. The pistons in the float cup pump are fixed pistons, that is, fixed on the main shaft, and the pistons have no relative motion freedom with the main shaft. The cylinder is a split cylinder, and the piston chamber is designed independently as a new part called the "cup". The cup is fitted onto the fixed piston, and at the same time, the two ends of the cup are clamped in the split cylinder. The cup has a certain degree of relative sliding motion freedom with respect to the split cylinder, which is the origin of the name "floating cup pump".

[0005] The split cylinder and main shaft of the float pump are connected and transmit torque via a drive pin. Since both the split cylinder and the cup are inclined relative to the main shaft, the rotation axis of the split cylinder and the rotation axis of the main shaft are not on the same axis, but at an interaxial angle. Therefore, the rotation speed of the split cylinder and the main shaft are not completely equal. As a result, the plunger pair of the float pump still has intermittent periodic lateral forces and friction. The floating cup and the split cylinder that holds the cup also have a certain degree of relative sliding motion, which also generates friction. That is, during the rotation of the float cup in the split cylinder, it is affected by the positioning of the cylindrical plate, and also needs to transmit power through the float cup plunger mounted on the turntable through a cylindrical surface to form a cantilever structure. This structure allows the float cup to achieve an elliptical motion trajectory. However, this complex power transmission and positioning mechanism imposes certain limitations on the performance of the float pump under high speed conditions.

[0006] With the development of electrification in construction machinery, the prime mover has been changed from an internal combustion engine to a servo motor. This requires a further increase in the speed of the plunger pump, doubling the current conventional speed from 1500-3000 r / min to 5000-6000 r / min, and even ideally reaching 9000-12000 r / min, to accommodate the high speed of the servo motor. The "floating" motion of the float cup caused by the non-uniform speed of the split cylinder block and the spindle in the float pump has little impact on the pump at the conventional speed of 1500-3000 r / min. Due to the simple structure and ease of manufacturing achieved through the drive pin connection, current float pumps all use drive pins to achieve the transmission between the spindle and the split cylinder block assembly. However, at speeds as high as 5000-6000 r / min, or even 9000-12000 r / min, the "floating" motion of the float cup will have a serious impact, causing the internal rotating components of the float cup pump to become unstable and vibrate. The "floating" motion will also cause serious friction and wear problems. The plunger of the cantilever structure will also be affected by the "floating" motion, and will be subjected to a large lateral force, threatening the structural strength and safety of the plunger. Summary of the Invention

[0007] The purpose of this invention is to provide an axial piston pump with a constant speed drive tilting cylinder assembly for the main shaft, and a symmetrical mirror-type axial piston pump with a constant speed drive tilting cylinder assembly for the main shaft. This novel structure is beneficial to increasing the speed of the piston pump to meet the high-speed drive requirements of the servo motor. The internal rotating components operate stably, ensuring the performance and structural safety of the piston pump.

[0008] The technical solution of the present invention is as follows:

[0009] An axial piston pump with a constant speed drive tilting cylinder assembly for the main shaft includes a pump body (2), a main shaft (1) rotatably mounted inside the pump body (2), a turntable (22) provided on the main shaft (1), ball joints (23) provided on one or both sides of the turntable (22) on the main shaft, a cylinder (9) installed on the outside of each ball joint (23), and a piston mechanism provided between the cylinder (9) and the turntable (22);

[0010] When the turntable (22) is provided with ball joints (23) and cylinder blocks, distributor plates and other structures on both sides, it forms a symmetrical mirror structure. When the turntable (22) is provided with ball joints (23) and cylinder blocks, distributor plates and other structures on one side, it forms a single-cylinder piston pump.

[0011] A distribution plate (4) is provided on the side of each cylinder (9) away from the turntable (22), and the distribution plate (4) is fixed to the inner wall of the pump body at a certain angle;

[0012] An oil inlet and an oil outlet are provided on the pump body (2), and an oil outlet / inlet flow channel is provided inside the pump body (2). The oil outlet / inlet flow channel is connected to the oil discharge distribution hole (21.2) and the oil suction distribution hole (21.1) of each distribution plate (4).

[0013] The ball joint (23) is characterized in that its outer surface is provided with multiple curved groove raceways (16.1) or multiple straight groove raceways (16.2); the multiple curved groove raceways (16.1) or multiple straight groove raceways (16.2) are provided with balls (7); the cylinder body is provided with a corresponding raceway between the multiple curved groove raceways (16.1) or multiple straight groove raceways (16.2), and the rolling cooperation of the balls (7) in the raceway transmits torque and drives the cylinder body (9) to rotate at a constant speed.

[0014] An axial piston pump with a constant-speed driven tilting cylinder assembly is characterized in that the piston mechanism has one of the following three structures:

[0015] S1. The cylinder body (9) adopts a split structure, consisting of a port plate (5), a float cup (6), a fixed cylindrical plate (9.1), and a fixed plate (12). The port plate (5) and the fixed plate (12) are fixedly connected. The float cup (6) is installed between the port plate (5) and the fixed plate (12). The fixed cylindrical plate (9.1) is installed between the inner rings of the port plate (5) and the fixed plate (12). The turntable (22) is provided with a corresponding cylindrical hole (15.1). The axial end of the float cup plunger (10.1) is a cylindrical head. The other end of each float plunger (10.1) is a spherical tail (27). The cylindrical head of each float plunger (10.1) is fixed in the cylindrical hole (15.1) and forms a cantilever structure corresponding to the turntable (22). The spherical tail (27) has a cylindrical groove (29) coaxial with the plunger. The spherical tail (27) of each float plunger (10.1) remains in the corresponding float (6) of the cylinder (9), and the outer wall of the spherical tail (27) is movably sealed with the inner wall of the corresponding float (6).

[0016] S2: The cylinder body (9) adopts a split structure, consisting of a port plate (5), a float cup (6), a telescopic cylindrical plate (9.2), and a fixed plate (12). The port plate (5) and the fixed plate (12) are fixedly connected. The float cup (6) is installed between the port plate (5) and the fixed plate (12). The telescopic cylindrical plate (9.2) is installed between the inner rings of the port plate (5) and the fixed plate (12). The turntable (22) is provided with a ball socket (15.2) and a thin rod plunger (10.2) with a central through hole (25). One axial end of the thin rod plunger (10.2) is a ball head (26), and the other axial end of each thin rod plunger (10.2) is a spherical tail (27), such that the ball head (26) of the thin rod plunger (10.2) is confined in the ball socket (15.2), and the spherical tail (27) has a cylindrical groove (29) coaxial with the plunger. The spherical tail (27) of each thin rod plunger (10.2) remains in the corresponding float cup (6), and the outer wall of the spherical tail (27) is movably sealed with the inner wall of the corresponding float cup (6).

[0017] S3: The cylinder body (9) is composed of a port plate (5) and an annular body (9.3). The annular body (9.3) is provided with a cylinder hole (30), and the turntable (22) is provided with a corresponding ball socket (15.2). The axial end of the thin rod plunger (10.3) with a central through hole (25) is a ball head (26), and the other axial end of each thin rod plunger is a spherical tail (27). The ball head (26) of the thin rod plunger (10.3) is limited in the ball socket (15.2), and the spherical tail (27) of each thin rod plunger (10.3) remains in the cylinder hole (30) of the annular body (9.3). The plunger ring (28) installed in the annular groove on the outer wall of the spherical tail (27) is in a movable seal with the inner wall of the corresponding cylinder hole (30).

[0018] The axial piston pump of the main shaft constant speed drive tilting cylinder assembly is characterized in that the outer surface of the ball joint (23) is provided with multiple curved groove raceways (16.1), and the multiple curved groove raceways (16.1) are provided with balls (7); the cylinder (9) and the multiple curved groove raceways (16.1) are provided with corresponding raceways, and the rolling cooperation of the balls (7) in the raceways transmits torque and drives the cylinder to rotate at a constant speed. The structure is as follows:

[0019] The cylinder body (9) adopts a split structure, consisting of a port plate (5), a float cup (6), a fixed cylindrical plate (9.1), and a fixed plate (12). The port plate (5) and the fixed plate (12) are fixedly connected. The float cup (6) is installed between the port plate (5) and the fixed plate (12). The fixed cylindrical plate (9.1) is installed between the inner rings of the port plate (5) and the fixed plate (12).

[0020] The ball joint (23) is fitted with a fixed retainer (8.1) on the outside, which is located inside the fixed cylindrical plate (9.1). The inner wall of the fixed cylindrical plate (9.1) is spherical and has a curved raceway (24.1) corresponding to the multiple curved groove raceways (16.1). A corresponding waist-shaped through hole (19) is opened on the fixed retainer (8.1). A ball (7) is provided in the waist-shaped through hole (19) of the fixed retainer (8.1). The ball (7) rolls between the curved groove raceway (16.1) and the curved raceway (24.1) on the inner wall of the fixed cylindrical plate (9.1). The main shaft (1) drives the ball joint (23) to rotate. Through the cooperation of the ball (7) and the curved groove raceway (16.1), the torque is transmitted, driving the cylinder body of the split structure (9) to rotate.

[0021] The axial piston pump of the constant speed drive tilting cylinder assembly is characterized in that the outer surface of the ball joint (23) is provided with multiple straight groove raceways (16.2); the multiple straight groove raceways (16.2) are provided with balls (7); the cylinder (9) and the multiple straight groove raceways (16.2) are provided with corresponding raceways, and the rolling contact of the balls (7) in the raceways transmits torque to drive the cylinder (9) to rotate. The structure is as follows:

[0022] The cylinder body (9) adopts a split structure, consisting of a port plate (5), a float (6), a telescopic cylindrical plate (9.2), and a fixing plate (12). The port plate (5) and the fixing plate (12) are fixedly connected. The float (6) is installed between the port plate (5) and the fixing plate (12). The telescopic cylindrical plate (9.2) is installed between the inner rings of the port plate (5) and the fixing plate (12). The ball joint (23) is fitted with a telescopic retainer (8.2) on its outer side, located inside the telescopic cylindrical plate (9.2). The inner wall of the telescopic cylindrical plate (9.2) is cylindrical and has a groove for connecting the ball joint to the cylinder. The linear raceways (24.2) corresponding to the multiple linear groove raceways (16.2) are described. The telescopic cage (8.2) has corresponding waist-shaped through holes (19). The waist-shaped through holes (19) of the telescopic cage (8.2) are provided with balls (7). The balls (7) roll between the linear groove raceways (16.2) and the linear raceways (24.2) on the inner wall of the telescopic cylindrical plate (9.2). The main shaft (1) drives the ball joint (23) to rotate. Through the cooperation of the balls (7) and the linear groove raceways (16.3), the torque is transmitted, driving the split-type cylinder (9) to rotate.

[0023] The axial piston pump of the constant speed drive tilting cylinder assembly is characterized in that the outer surface of the ball joint (23) is provided with multiple curved groove raceways (16.1), and the multiple curved groove raceways (16.1) are provided with balls (7); the cylinder (9) and the multiple curved groove raceways (16.1) are provided with corresponding raceways, and the rolling contact of the balls (7) in the raceways transmits torque to drive the cylinder to rotate. The structure is as follows:

[0024] The cylinder body (9) adopts an integrated structure, consisting of a port plate (5) and an annular body (9.3). The annular body (9.3) is provided with a cylinder hole (30). The ball joint (23) is fitted with a fixed retainer (8.1) on the outside. The inner wall of the annular body (9.3) is spherical and is provided with a curved raceway (24.1) corresponding to multiple curved groove raceways (16.1). A corresponding waist-shaped through hole (19) is opened on the fixed retainer (8.1). The waist-shaped through hole (19) on the fixed retainer (8.1) is provided with a ball (7). The ball (7) rolls between the multiple curved groove raceways (16.1) and the curved raceway (24.1) on the inner wall of the annular body (9.3) corresponding to them. The main shaft (1) drives the ball joint (23) to rotate. Through the cooperation of the ball (7) and the curved groove raceway (16.1), the torque is transmitted, driving the integrated structure cylinder body (9) to rotate.

[0025] The axial piston pump of the constant speed drive tilting cylinder assembly of the main shaft is characterized in that a support ring (14) is installed between the fixed cylindrical plate (9.1), the telescopic cylindrical plate (9.2), the annular body (9.3) and the port plate (5). The side of the support ring (14) near the ball joint (23) is a spherical surface that cooperates with the ball joint. A wave spring (13) is installed on the outside of the support ring (14). The wave spring (13) acts on the ball joint (23) and the port plate (5) through the support ring (14).

[0026] The axial piston pump of the main shaft constant speed drive tilting cylinder assembly is characterized in that the port plate (5) is provided with a plurality of oil passages (20) that can communicate with the float cup (6) and the cylinder bore (30), the port plate (5) is in contact with each other towards the distribution plate (4) to form an end face fit, and constitutes a distribution pair; the plurality of oil passages (20) are connected to the oil suction distribution hole (21.1) and the oil discharge distribution hole (21.2) on the distribution plate (4).

[0027] The axial piston pump of the main shaft constant speed drive tilting cylinder assembly is characterized in that the pump body includes a front pump body (2.1) and a rear pump body (2.2) fixedly connected together, and bearings (3) are respectively provided between the front pump body (2.1), the rear pump body (2.2) and the main shaft.

[0028] The axial piston pump of the main shaft constant speed drive tilting cylinder assembly is characterized in that the turntable (22) is fitted with a cover plate (11) by bolts (17), and the spherical through hole (18) of the cover plate (11) corresponds one-to-one with the ball socket (15.2) of the turntable (22), so that the ball head (26) of the thin rod piston (10.2) is limited to the ball socket (15.2).

[0029] The axial piston pump of the main shaft constant speed drive tilting cylinder assembly is characterized in that the turntable (22) is fitted with a cover plate (11) by bolts (17), the spherical through hole (18) of the cover plate (11) corresponds one-to-one with the ball socket (15.2) of the turntable (22), and the ball head (26) of the thin rod piston (10.3) is limited in the ball socket (15.2).

[0030] This invention achieves completely equal rotational speeds between the cylinder and the main shaft by adding curved or straight grooved raceways to the contact surfaces of the ball joint of the main shaft and the cylindrical plate of the cylinder, and by adding a retainer, thus forming a fixed / telescopic ball cage constant speed transmission mechanism.

[0031] This invention designs a thin rod plunger, the spherical tail of which forms a sealing surface with the float cup. The ball head of the thin rod plunger is fixed in the ball socket of the turntable by a cover plate. The thin rod plunger can "float" in the float cup of the cylinder, reducing the movement of the float cup. This solves the problem of transmitting power between the float cup and plunger pair through a cantilever structure, and reduces the lateral force and friction of the float cup.

[0032] This invention designs an integral cylinder body formed by an annular body and a port plate, and a thin rod plunger II with a plunger ring. The annular body fixes the center of mass of the cylinder body, and the sealing ring of the thin rod plunger II forms a sealing surface with the cylinder bore, allowing the thin rod plunger II to float in the cylinder body. This solves the limitation of float cup pumps under high speed conditions and broadens the operating conditions of float cup pumps.

[0033] Because the cylinder and the main shaft rotate synchronously at the same speed, this invention can effectively solve the "floating" motion of the float in the original float pump. This technical feature makes the invention more adaptable to the high-speed drive conditions of servo motors. At high speeds, the rotating components can reduce vibration and operate more stably, eliminating the "floating" motion of the float, reducing the lateral force between the plunger pairs, reducing friction and wear problems, and helping to extend the service life of the plunger pump. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the present invention in Example 1.

[0035] Figure 2 This is a schematic diagram of the structure of the present invention in Example 2.

[0036] Figure 3This is a schematic diagram of the structure of the present invention in Example 3.

[0037] Figure 4 This is a cross-sectional view of the internal structure of the present invention in Example 1.

[0038] Figure 5 This is a cross-sectional view of the internal structure of the present invention in Example 2.

[0039] Figure 6 This is a cross-sectional view of the internal structure of the present invention in Example 3.

[0040] Figure 7 These are cross-sectional views of the cylinder block structures in Examples 1 and 2.

[0041] (a) Cross-sectional view of the cylinder block structure in Example 1, (b) Cross-sectional view of the cylinder block structure in Example 2

[0042] Figure 8 This is a cross-sectional view of the cylinder block structure in Example 3.

[0043] Figure 9 This is a diagram of the spindle mounting structure for Example 3.

[0044] Figure 10 This is a schematic diagram of the ball joint structure of the present invention.

[0045] (a) Spherical hinge structure of Example 3, (b) Spherical hinge structure of Example 2

[0046] Figure 11 This is a schematic diagram of the spindle structure in Embodiment 1 of the present invention.

[0047] Figure 12 The diagram shows the turntable cover structure of Examples 2 and 3.

[0048] Figure 13 This is a cross-sectional view of the float plunger, turntable, and float structure of Example 1.

[0049] Figure 14 This is a cross-sectional view of the structure of the thin rod plunger, turntable, and float cup in Example 2.

[0050] Figure 15 This is a cross-sectional view of the structure of the thin rod plunger, turntable, and cylinder block in Example 3.

[0051] Figure 16 This is a cross-sectional view of the float plunger in Example 1.

[0052] Figure 17 This is a cross-sectional view of the thin rod plunger in Example 2.

[0053] Figure 18 This is a two-section view of the thin rod plunger structure in Example 3.

[0054] Figure 19This is a schematic diagram of the assembly structure of ball joint, fixed cage, fixed cylindrical plate and ball bearings in Example 1.

[0055] Figure 20 This is a schematic diagram of the assembly structure of ball joint, telescopic cage, telescopic cylindrical plate and ball bearings in Example 2.

[0056] Figure 21 This is a schematic diagram of the assembly structure of ball joint, fixed cage, ring body and ball bearings in Example 3.

[0057] Figure 22 This is a schematic cross-sectional view of the fixed cylindrical plate in Example 1.

[0058] Figure 23 This is a schematic cross-sectional view of the telescopic cylindrical plate in Example 2.

[0059] Figure 24 This is a schematic diagram of the cross-sectional structure of the annular body in Example 3.

[0060] Figure 25 This is a schematic diagram of the fixed cylindrical plate in Example 1.

[0061] Figure 26 This is a schematic diagram of the telescopic cylindrical plate structure in Example 2.

[0062] Figure 27 This is a schematic diagram of the ring-shaped structure in Example 3.

[0063] Figure 28 This is a sectional view of a fixed cage.

[0064] Figure 29 This is a sectional view of the telescopic cage.

[0065] Figure 30 This is a schematic diagram of the distribution plate structure.

[0066] Numbered components in the diagram: 1. Main shaft; 2. Pump body; 2.1. Front pump body; 2.2. Rear pump body; 3. Bearing; 4. Distribution plate; 5. Port plate; 6. Float cup; 7. Ball bearing; 8.1. Fixed cage; 8.2. Telescopic cage; 9. Cylinder body; 9.1. Fixed cylindrical plate; 9.2. Telescopic cylindrical plate; 9.3. Annular body; 10.1. Float cup plunger; 10.2. Thin rod plunger one; 10.3. Thin rod plunger two; 11. Cover plate; 12. Fixed plate; 13. Wave spring; 14. Support ring, 15.1 Cylindrical hole, 15.2 Ball socket, 16.1 Curved groove raceway, 16.2 Straight groove raceway, 17 Bolt, 18 Spherical through hole, 19 Waist-shaped through hole, 20 Oil passage, 21.1 Oil suction distribution hole, 21.2 Oil discharge distribution hole, 22 Turntable, 23 Ball joint, 24.1 Curved raceway, 24.2 Straight raceway, 25 Center through hole, 26 Ball head, 27 Spherical tail, 28 Piston ring, 29 Cylindrical groove, 30 Cylinder bore. Detailed Implementation

[0067] See appendix Figure 1-30 . Example 1:

[0068] An axial piston pump with a constant-speed driven tilting cylinder assembly includes a pump body 2, a main shaft 1 rotatably mounted inside the pump body 2, an integrally formed turntable 22 on the main shaft 1, integrally formed ball joints 23 on both sides of the turntable 22 on the main shaft, a cylinder 9 mounted on the outside of each ball joint 23, and a piston mechanism between the cylinder 9 and the turntable 22; the piston pump has a symmetrical mirror structure.

[0069] A distribution plate 4 is provided on the side of each cylinder 9 away from the turntable 22, and the distribution plate 4 is fixed to the inner wall of the pump body at a certain angle.

[0070] The pump body 2 is provided with an oil inlet and an oil outlet, and an oil outlet / inlet flow channel is provided inside the pump body 2. The oil outlet / inlet flow channel is connected to the oil discharge distribution hole 21.2 and the oil suction distribution hole 21.1 of each distribution plate 4 respectively.

[0071] The cylinder body 9 adopts a split structure, consisting of a port plate 5, a float cup 6, a fixed cylindrical plate 9.1, and a fixed plate 12. The port plate 5 and the fixed plate 12 are fixedly connected. The float cup 6 is installed between the port plate 5 and the fixed plate 12. The fixed cylindrical plate 9.1 is installed between the inner rings of the port plate 5 and the fixed plate 12. The turntable 22 is provided with a cylindrical hole 15.1. One axial end of each float cup plunger 10.1 is a cylindrical head, and the other axial end of each float cup plunger 10.1 is a spherical tail 27. The cylindrical head of each float cup plunger 10.1 is fixed in the cylindrical hole 15.1, forming a cantilever structure corresponding to the turntable 22. The spherical tail 27 has a cylindrical groove 29 coaxial with the plunger. The spherical tail 27 of each float cup plunger 10.1 remains in the corresponding float cup 6 of the cylinder body 9, and the outer wall of the spherical tail 27 is movably sealed with the inner wall of the corresponding float cup 6.

[0072] The ball joint 23 is fitted with a fixed retainer 8.1, which is located inside a fixed cylindrical plate 9.1. The inner wall of the fixed cylindrical plate 9.1 is spherical and has curved raceways 24.1 corresponding to the multiple curved groove raceways 16.1. A corresponding waist-shaped through hole 19 is opened on the fixed retainer 8.1. A ball 7 is provided in the waist-shaped through hole 19 of the fixed retainer 8.1. The ball 7 rolls between the curved groove raceway 16.1 and the curved raceway 24.1 on the inner wall of the fixed cylindrical plate 9.1. The main shaft 1 drives the ball joint 23 to rotate. Through the cooperation of the ball 7 and the curved groove raceway 16.1, the torque is transmitted, driving the split-structure cylinder 9 to rotate.

[0073] The pump body 2 is provided with an oil inlet and an oil outlet, and an oil outlet / inlet flow channel is provided inside the pump body 2. The oil outlet / inlet flow channel is connected to the oil discharge distribution hole 21.2 and the oil suction distribution hole 21.1 of each distribution plate 4 respectively.

[0074] The turntable 22 has the same number of cylindrical holes 15.1 intersecting on its two sides. The cylinder body 9 has multiple float cups 6 corresponding to the cylindrical holes 15.1. The outer wall of the spherical tail 27 and the inner wall of the corresponding float cup 6 are directly sealed through a spherical-cylindrical line contact.

[0075] The port plate 5 is provided with multiple oil passages 20. The port plates 5 are in contact with each other facing the distribution plate 4 to form an end face fit, thus forming a distribution pair. The multiple oil passages 20 are connected to the oil suction distribution hole 21.1 and the oil discharge distribution hole 21.2 on the distribution plate 4.

[0076] A support ring 14 is installed on the outer side of the fixed cylindrical plate 9.1. The side of the support ring 14 near the ball joint 23 is a spherical surface that mates with the ball joint 23. A wave spring 13 is installed on the outer side. The wave spring 13 acts on the ball joint 23 and the port plate 5 through the support ring 14, so that the cylinder 9 presses against the distribution plate 4.

[0077] The pump body includes a front pump body 2.1 and a rear pump body 2.2. Bearings 3 are provided between the front pump body 2.1, the rear pump body 2.2 and the main shaft. There are 24 float plungers 10.1 in total, with 12 installed on one side of the turntable 22 and arranged crosswise on both sides of the turntable 22. The oil passage 20 on the port plate 5 is connected to the oil circuit. The pump body 2 is provided with an oil inlet and an oil outlet. The pump body 2 is provided with an oil outlet / inlet flow channel. The two ends of the oil outlet / inlet flow channel are connected to the oil discharge distribution hole 21.2 and the oil suction distribution hole 21.1 of the distribution plate 4 on both sides, respectively.

[0078] When the central axis of the split cylinder body is at an angle to the axis of the main shaft 1, the curved groove raceway 16.1 at the center of the ball joint 23 of the main shaft 1 intersects the curved groove raceway 16.1 at the center of the fixed cylindrical plate 9.1 at the angle bisector and passes through the inner / outer center point of the fixed cage 8.1. That is, the outer spherical surface of the ball joint 23 matches the inner spherical surface of the cage, and the inner spherical surface of the fixed cylindrical plate 9.1 and the outer spherical surface of the fixed cage 8.1 are in spherical contact. The center of the ball 7 is always on the angle bisector and;

[0079] The main shaft 1 is driven to rotate by the prime mover. The rotating main shaft 1 rotates synchronously through the ball joint 23. The ball 7 held in the waist-shaped through hole 19 of the fixed cage 8.1 can roll freely between the curved groove raceway 16.1 on the ball joint 23 and the curved raceway 24.1 on the fixed cylindrical plate 9.1. When the angle between the central axis of the split structure cylinder 9 and the main shaft 1 is constant, the ball 7 held in the waist-shaped through hole 19 of the fixed cage 8.1 is positioned by the cross action of the curved groove raceway 16.1 on the ball joint 23 and the curved raceway 24.1 on the fixed cylindrical plate 9.1. The ball joint 23 and the fixed cylindrical plate 9.1 transmit force and torque through the ball 7.

[0080] The centers of all the balls 7 are located on the bisecting plane of the angle between the central axes of the ball joint 23 and the fixed cylindrical plate 9.1, thus enabling the main shaft 1 to drive the split-type cylinder block to rotate at a constant speed synchronously. During this process, the cylindrical head of the float plunger 10.1 is installed in the cylindrical hole 15.1 of the turntable 22, and the outer wall of the spherical tail 27 of the float plunger 10.1 and the inner wall of the corresponding float 7 are directly sealed through spherical-cylindrical line contact. Example 2

[0081] An axial piston pump with a constant speed drive tilting cylinder assembly includes a pump body 2, a main shaft 1 rotatably mounted inside the pump body 2, a turntable 22 provided on the main shaft 1, ball joints 23 provided on one or both sides of the turntable 22 on the main shaft, a cylinder 9 installed on the outside of each ball joint 23, and a piston mechanism provided between the cylinder 9 and the turntable 22.

[0082] A distribution plate 4 is provided on the side of each cylinder 9 away from the turntable 22, and the distribution plate 4 is fixed to the inner wall of the pump body at a certain angle.

[0083] The pump body 2 is provided with an oil inlet and an oil outlet, and an oil outlet / inlet flow channel is provided inside the pump body 2. The oil outlet / inlet flow channel is connected to the oil discharge distribution hole 21.2 and the oil suction distribution hole 21.1 of each distribution plate 4 respectively.

[0084] The cylinder body 9 adopts a split structure, consisting of a port plate 5, a float cup 6, a telescopic cylindrical plate 9.2, and a fixed plate 12. The port plate 5 and the fixed plate 12 are fixedly connected. The float cup 6 is installed between the port plate 5 and the fixed plate 12. The telescopic cylindrical plate 9.2 is installed between the inner rings of the port plate 5 and the fixed plate 12. The turntable 22 is provided with a corresponding ball socket 15.2.

[0085] The ball joint 23 is fitted with a telescopic retainer 8.2 on the outside, located inside the telescopic cylindrical plate 9.2. The inner wall of the telescopic cylindrical plate 9.2 is cylindrical and has straight raceways 24.2 corresponding to the plurality of straight groove raceways 16.2. The telescopic retainer 8.2 has corresponding waist-shaped through holes 19. Balls 7 are provided in the waist-shaped through holes 19 of the telescopic retainer 8.2. The balls 7 roll between the straight groove raceways 16.2 and the straight raceways 24.2 on the inner wall of the telescopic cylindrical plate 9.2. The main shaft 1 drives the ball joint 23 to rotate, and transmits torque through the cooperation of the balls 7 and the straight groove raceways 16.3, driving the split-structure cylinder 9 to rotate.

[0086] When using the ball socket 15.2, it needs to be installed in conjunction with a thin rod plunger 10.2 having a central through hole 25. The turntable 22 is fitted with a cover plate 11 by bolts 17. The spherical through holes 18 of the cover plate 11 correspond one-to-one with the ball sockets 15.2 of the turntable 22. One axial end of the thin rod plunger 10.2 is a ball head 26, which is confined within the ball socket 15.2. The other axial end of each thin rod plunger 10.2 is a spherical tail 2. 7. The spherical tail 27 has a cylindrical groove 29 coaxial with the plunger. The outer surface of the cylindrical groove 29 is a spherical surface with the same diameter as the inner diameter of the float cup 7. The ball head of each thin rod plunger 10.2 is located outside the spherical through hole 18 at the corresponding position of the cover plate 11 and faces the turntable 22. The spherical tail 27 of each thin rod plunger 10.2 remains in the corresponding float cup 6, and the outer wall of the spherical tail 27 and the inner wall of the corresponding float cup 6 are directly sealed through the spherical-cylindrical line contact.

[0087] When the central axis of the split-type cylinder body 9 is at an angle to the axis of the main shaft 1, the straight groove raceway 16.2 of the ball joint 23 of the main shaft 1 and the straight raceway 24.2 of the telescopic cylindrical plate 9.2 intersect at the angle bisector and pass through it. At this time, the inner spherical center of the telescopic retainer 8.2 is in contact with the outer surface of the ball joint 23, and the outer spherical center of the telescopic retainer 8.2 always coincides with the central axis of the telescopic cylindrical plate 9.2. That is, the telescopic retainer 9.2 and the cylindrical surface of the telescopic cylindrical plate 9.2 are in line contact.

[0088] The main shaft 1 is driven to rotate by the prime mover. The rotating main shaft 1 rotates synchronously with the ball joint 23. The ball 7, which is clamped in the waist-shaped through hole 19 of the telescopic cage 8.2, can roll freely between the straight groove raceway 16.2 on the ball joint 23 and the straight raceway 24.2 on the telescopic cylindrical plate 9.2. When the angle between the central axis of the telescopic cylindrical plate 9.2 and the ball joint 23 is constant, the ball 7 clamped in the waist-shaped through hole 19 of the telescopic cage 8.2 is positioned by the cross action of the straight groove raceway 16.2 on the ball joint 23 and the straight raceway 24.2 on the telescopic cylindrical plate 9.2. The ball joint 23 and the telescopic cylindrical plate 9.2 transmit force and torque through the ball 7.

[0089] The centers of all the balls 7 are located on the bisecting plane of the angle between the central axes of the ball joint 23 and the telescopic cylindrical plate 9.2. Therefore, the spindle 1 can drive the split-type cylinder block to rotate at a constant speed synchronously, and axial displacement is also allowed. That is, the balls can roll axially on the straight groove raceway 16.2, which can compensate for the axial movement between the ball joint 23 and the split-type cylinder block caused by working and installation errors. During this period, the ball head of the thin rod plunger 10.2 is installed in the ball socket 15.2 of the turntable 22. The outer wall of the spherical tail 27 of the thin rod plunger 10.2 and the inner wall of the corresponding float cup 7 are directly sealed through the spherical-cylindrical line contact. The thin rod plunger 10.2 can "float" in the float cup of the split-type cylinder block. Example 3

[0090] An axial piston pump with a constant speed drive tilting cylinder assembly includes a pump body 2, a main shaft 1 rotatably mounted inside the pump body 2, a turntable 22 provided on the main shaft 1, ball joints 23 provided on one or both sides of the turntable 22 on the main shaft, a cylinder 9 installed on the outside of each ball joint 23, and a piston mechanism provided between the cylinder 9 and the turntable 22.

[0091] A distribution plate 4 is provided on the side of each cylinder 9 away from the turntable 22, and the distribution plate 4 is fixed to the inner wall of the pump body at a certain angle.

[0092] The pump body 2 is provided with an oil inlet and an oil outlet, and an oil outlet / inlet flow channel is provided inside the pump body 2. The oil outlet / inlet flow channel is connected to the oil discharge distribution hole 21.2 and the oil suction distribution hole 21.1 of each distribution plate 4 respectively.

[0093] The cylinder body 9 adopts an integral structure, which is formed by the fixed connection between the port plate 5 and the annular body 9.3. The annular body 9.3 is provided with a cylinder bore 30, and the turntable 22 is provided with a corresponding ball socket 15.2. One axial end of the thin rod plunger 10.3 with a central through hole 25 is a ball head 26, and the other axial end of each thin rod plunger is a spherical tail 27. The ball head 26 of the thin rod plunger 10.3 is confined in the ball socket 15.2, and the spherical tail 27 of each thin rod plunger 10.3 remains in the cylinder bore 30 of the annular body 9.3. The plunger ring 28 installed in the annular groove on the outer wall of the spherical tail 27 is movably sealed with the inner wall of the corresponding cylinder bore 30.

[0094] The ball joint 23 is fitted with a fixed retainer 8.1 on the outside. The inner wall of the annular body 9.3 is spherical and has curved raceways 24.1 corresponding to multiple curved groove raceways 16.1. A corresponding waist-shaped through hole 19 is opened on the fixed retainer (8.1). The waist-shaped through hole 19 on the fixed retainer (8.1) is provided with a ball 7. The ball 7 rolls between the multiple curved groove raceways 16.1 and the curved raceways 24.1 on the inner wall of the annular body 9.3. The main shaft 1 drives the ball joint 23 to rotate. Through the cooperation of the ball 7 and the curved groove raceway 16.1, the torque is transmitted, driving the integrated structure cylinder 9 to rotate.

[0095] When the central axis of the cylinder body 9 is at an angle to the axis of the main shaft 1, the curved groove-shaped raceway 16.1 at the center of the ball joint 23 of the main shaft 1 intersects the curved raceway 24.1 at the center of the cylinder body 9 at the angle bisector and passes through the inner and outer center points of the fixed cage 8.1. That is, the outer spherical surface of the ball joint 23 and the inner spherical surface of the fixed cage 9.1, and the inner spherical surface of the cylinder body 9 and the outer spherical surface of the fixed cage 9.1 are in spherical contact. The center of the ball 7 is always located on the angle bisector. The typical number of the inner raceway on the ball joint 23, the outer raceway on the cylinder body, the ball, and the waist-shaped through hole of the cage is 6 each. Depending on the magnitude of the transmitted force and torque, other numbers may also be used.

[0096] The main shaft 1 is driven to rotate by the prime mover, and the main shaft ball joint 23 rotates synchronously. The ball 7 held in the waist-shaped through hole 19 of the fixed cage 8.1 can roll freely between the curved groove raceway 16.1 on the ball joint 23 and the curved raceway 24.1 on the cylinder 9. When the angle between the central axis of the cylinder and the main shaft 1 is constant, the ball 7 held in the waist-shaped through hole 19 of the fixed cage 8.1 is positioned by the cross action of the ball joint 23 and the integrated structure cylinder 9. The ball joint 23 and the cylinder 9 transmit force and torque through the ball 7.

[0097] The centers of all the balls 7 are located on the bisecting plane of the angle between the central axes of the ball joint 23 and the cylinder 9, thus enabling the main shaft 1 to drive the cylinder to rotate at a constant speed synchronously. During this process, the ball head 26 of the thin rod plunger 20.3 is installed in the ball socket 15.2 of the turntable 22, and the plunger ring 28 is installed on the outer wall of the spherical tail 27 of the thin rod plunger 20.3, forming a seal with the inner wall of the corresponding cylinder bore 30 through spherical-cylindrical line contact.

[0098] When the pump body is in the oil suction rotation cycle, the thin rod plunger 10.3, under the action of the rotary table 22 and the corresponding cylinder bore 30 in the cylinder body 9, forms a seal by contacting the inner wall of the corresponding cylinder bore 30 through the spherical tail 27, causing the volume of the sealed working chamber of the corresponding cylinder bore in the cylinder body to continuously increase, generating a partial vacuum. When the cylinder bore 30 forming the partial vacuum rotates until the oil passage 20 is aligned with the oil suction distribution hole 21.1 of the distribution plate 4, low-pressure oil from the hydraulic system is sucked into the cylinder bore 30 forming the partial vacuum through the oil suction distribution hole 21.1 of the distribution plate 4.

[0099] As the cylinder body 9 continues to rotate until the pump body is in the oil discharge rotation cycle, the volume of the sealed working chamber formed in the cylinder bore 30 of the cylinder body 9 behind the thin rod plunger 10.3 decreases. Therefore, the hydraulic pressure of the oil in the cylinder bore 30 increases, forming high-pressure oil. When the cylinder body rotates until the oil passage 30 is aligned with the oil discharge distribution hole 21.2 of the distribution plate 4, the high-pressure oil is discharged through the oil discharge distribution hole 21.2 of the distribution plate 4.

[0100] In this patent embodiment, the plungers are installed crosswise on both sides of the turntable 22. If the plungers are arranged axially symmetrically on both sides of the turntable 22, they should also fall within the protection scope of this patent.

[0101] As a specific case, an axial piston pump with a main shaft driving a tilting cylinder assembly at a constant speed, as a single-cylinder structure, includes a pump body 2, a main shaft 1 rotatably mounted inside the pump body 2, an integrally formed turntable 22 provided on the main shaft 1, an integrally formed ball joint 23 provided on the main shaft on one side of the turntable 22, a cylinder body 9 installed on the outside of the ball joint 23, and a piston mechanism provided between the cylinder body 9 and the turntable 22;

[0102] A distribution plate 4 is provided on the side of each cylinder 9 away from the turntable 22. The distribution plate 4 is fixed to the inner wall of the pump body at a certain angle; the rest is the same as the ball joint structure provided on both sides.

Claims

1. An axial piston pump with a constant speed drive tilting cylinder assembly, comprising a pump body (2), a main shaft (1) rotatably mounted inside the pump body (2), a turntable (22) on the main shaft (1), ball joints (23) on one or both sides of the turntable (22) on the main shaft, a cylinder (9) mounted outside each ball joint (23), a piston mechanism between the cylinder (9) and the turntable (22); a distribution plate (4) on the side of each cylinder (9) away from the turntable (22), the distribution plate (4) being fixed to the inner wall of the pump body at a certain tilt angle; an oil inlet and an oil outlet on the pump body (2), an oil outlet / inlet flow channel inside the pump body (2), the oil outlet / inlet flow channel being connected to the oil discharge distribution hole (21.2) and the oil suction distribution hole (21.1) of each distribution plate (4); characterized in that, The outer surface of the ball joint (23) is provided with multiple curved groove raceways (16.1) or multiple straight groove raceways (16.2); the multiple curved groove raceways (16.1) or multiple straight groove raceways (16.2) are provided with balls (7); the cylinder body and the multiple curved groove raceways (16.1) or multiple straight groove raceways (16.2) are provided with corresponding raceways, and the rolling cooperation of the balls (7) in the raceways transmits torque, driving the cylinder body (9) to rotate at a constant speed.

2. The axial piston pump with a constant-speed driven tilting cylinder assembly according to claim 1, characterized in that, The cylinder assembly and plunger mechanism are one of the following three structures: S1: The cylinder (9) adopts a split structure, consisting of a port plate (5), a float (6), a fixed cylindrical plate (9.1), and a fixed plate (12). The port plate (5) and the fixed plate (12) are fixedly connected. The float (6) is installed between the port plate (5) and the fixed plate (12). The fixed cylindrical plate (9.1) is installed between the inner rings of the port plate (5) and the fixed plate (12). The turntable (22) is provided with a cylindrical hole (15.1). One axial end of the float plunger (10.1) is a cylindrical head, and the other axial end of each float plunger (10.1) is a spherical tail (27). The cylindrical head of each float plunger (10.1) is fixed. Inside the cylindrical hole (15.1), a cantilever structure is formed corresponding to the turntable (22). The spherical tail (27) has a cylindrical groove (29) coaxial with the plunger. The spherical tail (27) of each float plunger (10.1) remains in the corresponding float (6) of the cylinder body (9), and the outer wall of the spherical tail (27) and the inner wall of the corresponding float (6) are movably sealed. S2: The cylinder body (9) adopts a split structure, which is composed of a port plate (5), a float (6), a telescopic cylindrical plate (9.2), and a fixing plate (12). The port plate (5) and the fixing plate (12) are fixedly connected. The float (6) is installed between the port plate (5) and the fixing plate (12), and the telescopic cylindrical plate (9.2) is installed on the port plate. (5) Between the inner rings of the fixed plate (12), the turntable (22) is provided with a ball socket (15.2) and a thin rod plunger (10.2) with a central through hole (25). One axial end of the thin rod plunger (10.2) is a ball head (26), and the other axial end of each thin rod plunger (10.2) is a spherical tail (27), so that the ball head (26) of the thin rod plunger (10.2) is confined in the ball socket (15.2), and the spherical tail (27) has a cylindrical groove (29) coaxial with the plunger. The spherical tail (27) of each thin rod plunger (10.2) remains in the corresponding float cup (6), and the outer wall of the spherical tail (27) is movably sealed with the inner wall of the corresponding float cup (6); S3: The The cylinder body (9) is composed of a port plate (5) and an annular body (9.3). The annular body (9.3) is provided with a cylinder bore (30), and the turntable (22) is provided with a corresponding ball socket (15.2). The axial end of the thin rod plunger (10.3) with a central through hole (25) is a ball head (26), and the other axial end of each thin rod plunger is a ball tail (27). The ball head (26) of the thin rod plunger (10.3) is limited in the ball socket (15.2), and the ball tail (27) of each thin rod plunger (10.3) remains in the cylinder bore (30) of the annular body (9.3). The plunger ring (28) installed in the annular groove on the outer wall of the ball tail (27) is in a movable seal with the inner wall of the corresponding cylinder bore (30).

3. An axial piston pump with a constant-speed driven tilting cylinder assembly according to claim 1, characterized in that, The ball joint (23) has multiple curved groove raceways (16.1) on its outer side, and ball bearings (7) are provided in the multiple curved groove raceways (16.1); the cylinder body (9) and the multiple curved groove raceways (16.1) are provided with corresponding raceways. The rolling of the ball bearings (7) in the raceways transmits torque and drives the cylinder body to rotate. The structure is as follows: The cylinder body (9) adopts a split structure, consisting of a port plate (5), a float cup (6), a fixed cylindrical plate (9.1), and a fixed plate (12). The port plate (5) and the fixed plate (12) are fixedly connected. The float cup (6) is installed between the port plate (5) and the fixed plate (12). The fixed cylindrical plate (9.1) is installed in the inner ring of the port plate (5) and the fixed plate (12). Between; the ball joint (23) is fitted with a fixed retainer (8.1) on the outside, located inside the fixed cylindrical plate (9.1). The inner wall of the fixed cylindrical plate (9.1) is spherical and has curved raceways (24.1) corresponding to the multiple curved groove raceways (16.1). A corresponding waist-shaped through hole (19) is opened on the fixed retainer (8.1). A ball (7) is provided in the waist-shaped through hole (19) of the fixed retainer (8.1). The ball (7) rolls between the curved groove raceway (16.1) and the curved raceway (24.1) on the inner wall of the fixed cylindrical plate (9.1). The main shaft (1) drives the ball joint (23) to rotate. Through the cooperation of the ball (7) and the curved groove raceway (16.1), the torque is transmitted to drive the cylinder body of the split structure to rotate.

4. An axial piston pump with a constant-speed driven tilting cylinder assembly according to claim 1, characterized in that, The outer side of the ball joint (23) is provided with multiple straight groove raceways (16.2); the multiple straight groove raceways (16.2) are provided with balls (7); the cylinder (9) and the multiple straight groove raceways (16.2) are provided with corresponding raceways. The rolling cooperation of the balls (7) in the raceways transmits torque and drives the cylinder (9) to rotate. The structure is as follows: the cylinder (9) adopts a split structure, which is composed of a port plate (5), a float cup (6), a telescopic cylindrical plate (9.2), and a fixed plate (12). The port plate (5) and the fixed plate (12) are fixedly connected. The float cup (6) is installed between the port plate (5) and the fixed plate (12). The telescopic cylindrical plate (9.2) is installed between the inner rings of the port plate (5) and the fixed plate (12). The ball joint (23) is fitted with a telescopic retainer (8.2) on the outside, located inside the telescopic cylindrical plate (9.2). The inner wall of the telescopic cylindrical plate (9.2) is cylindrical and has a straight raceway (24.2) corresponding to the multiple straight groove raceways (16.2). The telescopic retainer (8.2) has a corresponding waist-shaped through hole (19). The waist-shaped through hole (19) of the telescopic retainer (8.2) is provided with a ball (7). The ball (7) rolls between the straight groove raceway (16.2) and the straight raceway (24.2) on the inner wall of the telescopic cylindrical plate (9.2). The main shaft (1) drives the ball joint (23) to rotate. Through the cooperation of the ball (7) and the straight groove raceway (16.2), the torque is transmitted, driving the split-type cylinder (9) to rotate.

5. An axial piston pump with a constant-speed driven tilting cylinder assembly according to claim 1, characterized in that, The outer side of the ball joint (23) is provided with multiple curved groove raceways (16.1), and the multiple curved groove raceways (16.1) are provided with balls (7); the cylinder body (9) and the multiple curved groove raceways (16.1) are provided with corresponding raceways, and the rolling cooperation of the balls (7) in the raceways transmits torque and drives the cylinder body to rotate. The structure is as follows: the cylinder body (9) adopts an integral structure, which is composed of a port plate (5) and an annular body (9.3). The annular body (9.3) is provided with a cylinder hole (30). The outer side of the ball joint (23) is fitted with a fixed retainer (8.1), and the annular body (9.3) is provided with a cylinder hole (30). 3) The inner wall is spherical and has curved raceways (24.1) corresponding to multiple curved groove raceways (16.1). A corresponding waist-shaped through hole (19) is opened on the fixed retainer (8.1). The waist-shaped through hole (19) on the fixed retainer (8.1) is provided with ball (7). The ball (7) rolls between the multiple curved groove raceways (16.1) and the curved raceways (24.1) on the inner wall of the corresponding annular body (9.3). The main shaft (1) drives the ball joint (23) to rotate. Through the cooperation of the ball (7) and the curved groove raceway (16.1), the torque is transmitted to drive the integrated structure cylinder (9) to rotate.

6. An axial piston pump with a constant-speed driven tilting cylinder assembly according to claim 2, characterized in that, A support ring (14) is installed between the fixed cylindrical plate (9.1), the telescopic cylindrical plate (9.2), the annular body (9.3) and the port plate (5). The side of the support ring (14) near the ball joint (23) is a spherical surface that cooperates with the ball joint. A wave spring (13) is installed on the outside of the support ring (14). The wave spring (13) acts on the ball joint (23) and the port plate (5) through the support ring (14).

7. An axial piston pump with a constant-speed driven tilting cylinder assembly according to claim 2, characterized in that, The port plate (5) is provided with multiple oil passages (20) that can communicate with the float cup (6) and the cylinder bore (30). The port plate (5) is in contact with the distribution plate (4) to form an end face fit, thus forming a distribution pair. The multiple oil passages (20) are connected to the oil suction distribution hole (21.1) and the oil discharge distribution hole (21.2) on the distribution plate (4).

8. An axial piston pump with a constant-speed driven tilting cylinder assembly according to claim 1, characterized in that, The pump body consists of a front pump body (2.1) and a rear pump body (2.2) fixedly connected together, and bearings (3) are respectively provided between the front pump body (2.1), the rear pump body (2.2) and the main shaft.

9. An axial piston pump with a constant-speed driven tilting cylinder assembly according to claim 2, characterized in that, The turntable (22) is fitted with a cover plate (11) by bolts (17). The spherical through hole (18) of the cover plate (11) corresponds one-to-one with the ball socket (15.2) of the turntable (22), so that the ball head (26) of the thin rod plunger (10.2) is confined in the ball socket (15.2).

10. An axial piston pump with a constant-speed driven tilting cylinder assembly according to claim 2, characterized in that, The turntable (22) is fitted with a cover plate (11) by bolts (17). The spherical through hole (18) of the cover plate (11) corresponds one-to-one with the ball socket (15.2) of the turntable (22). The ball head (26) of the thin rod plunger (10.3) is confined in the ball socket (15.2).

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