Axial plunger pump with main shaft driving inclined cylinder body assembly at constant speed

Abstract

The axial plunger pump comprises a pump body and the main shaft, a rotating disc and spherical hinges are arranged on the main shaft, a cylinder body is installed on the outer side of each spherical hinge, and plunger mechanisms are arranged between the cylinder bodies and the rotating disc. A valve plate is arranged on the outer side of the cylinder body, an oil outlet / inlet runner is arranged in the pump body, and a plurality of curved groove raceways or a plurality of linear groove raceways are arranged on the outer side surface of the spherical hinge; raceways corresponding to the curved-surface groove raceways or the linear groove raceways are arranged between the cylinder body and the curved-surface groove raceways or the linear groove raceways, torque is transmitted through rolling fit of the balls in the raceways, the principle of a fixed or telescopic ball cage type constant velocity universal joint transmission mechanism is formed, and the spindle drives the inclined cylinder body to rotate at a constant velocity. Due to the fact that the parts at the two ends of the plunger, namely the rotating disc and the cylinder body rotate synchronously at the same speed completely, the floating movement existing in the floating cup in the floating cup pump can be effectively solved, and under the high-rotating-speed driving working condition of the pump, an internal rotating assembly operates more stably, and friction abrasion is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic transmission, in particular to an axial piston pump of which a main shaft drives a tilting cylinder assembly at a constant speed. Background Art

[0002] Hydraulic transmission technology plays a key role in the modern industrial field, especially in the construction machinery industry. Most construction machinery relies on hydraulic transmission technology. As one of the core components of the hydraulic system, the hydraulic pump is a key component for providing power. The swash plate axial piston pump has become a common pump type in the hydraulic system of construction machinery due to its wide application.

[0003] As the world pursues the "dual carbon goals", namely reducing carbon emissions and achieving carbon neutrality, fluid power technology faces new opportunities and challenges. The construction machinery industry is transforming from traditional internal combustion engines to electric new energy. This transformation has put forward new technical requirements for the swash plate axial piston pump in the hydraulic system, and traditional pump types are facing the challenge of technological innovation.

[0004] The float cup pump is a new type of axial piston pump invented by INNAS of the Netherlands in recent years. It has expanded the number of plungers of the pump to 24, significantly reducing the flow pulsation, pressure pulsation and vibration noise of the pump, but it also brings new problems. The plunger of the float cup pump is a fixed plunger, that is, it is fixed on the main shaft, and the plunger and the main shaft have no relative motion freedom. The cylinder body is a split cylinder body, and the plunger cavity is independently designed into a new part called "cup body". The cup body is movably mounted on the fixed plunger, and the two ends of the cup body are clamped in the split cylinder body. The cup body has a certain spatial relative sliding motion freedom relative to the split cylinder body, which is the origin of the name "float cup pump".

[0005] The split cylinder body of the float cup pump is connected to the main shaft through a transmission pin to transmit torque. Since the split cylinder body and the cup body are arranged obliquely compared to the main shaft, the rotating axis of the split cylinder body of the float cup pump and the rotating axis of the main shaft are not on the same axis, but at an axis angle. Therefore, the speed of the split cylinder body of the float cup pump and the speed of the main shaft are not completely equal. Therefore, the plunger pair of the float cup pump still has intermittent periodic lateral force and friction. There is also a certain degree of relative sliding motion between the floating cup body of the float cup pump and the split cylinder body that clamps the cup body, which will also generate friction. That is, the float cup in the split cylinder body is affected by the positioning of the cylindrical plate during rotation, and it also needs to be installed in the turntable through the cylindrical surface through the float cup plunger to form a cantilever structure to transmit power. This structure enables the float cup to achieve an elliptical motion trajectory, but this complex power transmission and positioning mechanism imposes certain restrictions on the performance of the float cup pump under high speed conditions.

[0006] With the development of electrification of construction machinery, the prime mover of construction machinery has been changed from internal combustion engine to servo motor, which requires the speed of plunger pump to be further increased. Compared with the current conventional speed, it needs to be doubled from the current 1500-3000r / min to 5000-6000r / min, and even expected to reach 9000-12000r / min to adapt to the high speed of servo motor. Since the speed of the split cylinder of the float pump and the speed of the main shaft are not completely equal, the "floating" movement of the float cup is not greatly affected by the conventional speed of 1500-3000r / min. Because it is connected by a transmission pin, the structure is simple and the process is friendly, so the current float pumps all use transmission pins to realize the transmission of the main shaft and split cylinder assembly. However, at such a high speed of 5000-6000r / min, or even 9000-12000r / min, the "floating" motion of the float cup will have a more serious impact, causing the internal rotating components of the float cup pump to become unstable and vibrate. The "floating" motion will also cause more serious friction and wear problems. The plunger of the cantilever structure will also be affected by the "floating" motion and be subjected to a large lateral force, threatening the strength and safety of the plunger structure. Summary of the invention

[0007] The purpose of the present invention is to provide an axial piston pump with a main shaft driving a tilt cylinder assembly at a constant speed, and a symmetrical mirror-image axial piston pump with a main shaft driving a tilt cylinder assembly at a constant speed. This new structure is conducive to increasing the rotation speed of the piston pump to meet the high-speed drive requirements of the servo motor. The internal rotating assembly operates stably, ensuring the performance and structural safety of the piston pump.

[0008] The technical solution of the present invention is as follows: An axial piston pump with a main shaft driving a tilting cylinder assembly at a constant speed, comprising a pump body (2), a main shaft (1) rotatably mounted in the pump body (2), a turntable (22) being provided on the main shaft (1), a ball joint (23) being provided on one or both sides of the turntable (22) on the main shaft, a cylinder body (9) being mounted on the outside of each ball joint (23), and a plunger mechanism being provided between the cylinder body (9) and the turntable (22); When the two sides of the rotating disk (22) are respectively provided with a ball joint (23) and a cylinder body, a distribution plate and other structures, a symmetrical mirror structure is formed. When the one side of the rotating disk (22) is provided with a ball joint (23) and a cylinder body, a distribution plate and other structures, a single-cylinder plunger pump is formed.

[0009] A distribution plate (4) is provided on a side of each cylinder body (9) away from the rotating plate (22), and the distribution plate (4) is fixed to the inner wall of the pump body at a certain inclination angle; An oil inlet and an oil outlet are provided on the pump body (2), and an oil inlet / outlet flow channel is provided inside the pump body (2), wherein the oil inlet / outlet flow channel is respectively connected to the oil discharge distribution hole (21.2) and the oil suction distribution hole (21.1) of each distribution plate (4); The invention is characterized in that the outer side surface of the ball joint (23) is provided with a plurality of curved groove raceways (16.1) or a plurality of straight groove raceways (16.2); balls (7) are arranged inside the plurality of curved groove raceways (16.1) or the plurality of straight groove raceways (16.2); corresponding raceways are arranged between the cylinder body and the plurality of curved groove raceways (16.1) or the plurality of straight groove raceways (16.2), and torque is transmitted by rolling cooperation of the balls (7) in the raceways, thereby driving the cylinder body (9) to rotate at a constant speed.

[0010] The axial piston pump of the main shaft constant speed driving tilt cylinder assembly is characterized in that the piston mechanism is one of the following three structures: S1. The cylinder body (9) adopts a split structure, which is composed 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 port plate (5) and the inner ring of the fixed plate (12). The rotating disk (22) is provided with a cylindrical hole (15.1) correspondingly. The axial end of the float cup plunger (10.1) is a cylindrical head. 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), and forms a cantilever structure corresponding to the rotating disk (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) is retained in the float cup (6) corresponding to the cylinder body (9), and the outer wall of the spherical tail (27) and the inner wall of the corresponding float cup (6) are movably sealed; S2: The cylinder body (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 port plate (5) and the fixed plate (12) inner rings. The turntable (22) is provided with a corresponding ball socket (15.2) and a thin rod plunger (10.2) having 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 limited in the ball socket (15.2), the spherical tail (27) has a cylindrical groove (29) coaxial with the plunger, and the spherical tail (27) of each thin rod plunger (10.2) is retained 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 movably sealed; S3: The cylinder body (9) is composed of a port plate (5) and an annular body (9.3), a cylinder hole (30) is provided on the annular body (9.3), a ball socket (15.2) is correspondingly provided on the turntable (22), one axial end of a thin rod plunger (10.3) having 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), and a plunger ring (28) installed in an annular groove provided on the outer wall of the spherical tail (27) is movably sealed with the inner wall of the corresponding cylinder hole (30).

[0011] The axial piston pump of the main shaft constant speed driving tilt cylinder assembly is characterized in that the outer side surface of the ball joint (23) is provided with a plurality of curved groove raceways (16.1), and the plurality of curved groove raceways (16.1) are provided with balls (7); a corresponding raceway is provided between the cylinder body (9) and the plurality of curved groove raceways (16.1), and the torque is transmitted by the rolling cooperation of the balls (7) in the raceways to drive the cylinder body to rotate at a constant speed, and its implementation structure is as follows: The cylinder body (9) adopts a split structure, and is composed 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), and the fixed cylindrical plate (9.1) is installed between the inner rings of the port plate (5) and the fixed plate (12); The ball joint (23) is sleeved with a fixed retainer (8.1) on the outside and is located inside the fixed cylindrical plate (9.1). The inner wall of the fixed cylindrical plate (9.1) is a spherical surface and is provided with a curved surface raceway (24.1) corresponding to the plurality of curved surface 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 surface groove raceway (16.1) and the curved surface 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, and the torque is transmitted through the cooperation of the ball (7) and the curved surface groove raceway (16.1), thereby driving the cylinder body of the split structure (9) to rotate.

[0012] The axial piston pump of the main shaft constant speed driving tilt cylinder assembly is characterized in that the outer side surface of the ball joint (23) is provided with a plurality of linear groove rollers (16.2); the plurality of linear groove rollers (16.2) are provided with balls (7); and corresponding rollers are provided between the cylinder (9) and the plurality of linear groove rollers (16.2), and the torque is transmitted by the rolling cooperation of the balls (7) in the rollers to drive the cylinder (9) to rotate. The implementation structure is as follows: The cylinder body (9) adopts a split structure, and 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), and the telescopic cylindrical plate (9.2) is installed between the port plate (5) and the fixed plate (12). The outer side of the ball joint (23) is covered with a telescopic retainer (8.2) and is located on the inner side of the telescopic cylindrical plate (9.2). The inner wall of the telescopic cylindrical plate (9.2) is a cylindrical surface and is provided with a The linear raceways (24.2) corresponding to the plurality of linear groove raceways (16.2) are provided with corresponding waist-shaped through holes (19) on the telescopic retainer (8.2). A ball (7) is arranged in the waist-shaped through hole (19) of the telescopic retainer (8.2). The ball (7) rolls between the linear groove raceway (16.2) and the linear 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, and the torque is transmitted through the cooperation of the ball (7) and the linear groove raceway (16.3), thereby driving the cylinder body (9) of the split structure to rotate.

[0013] The axial piston pump of the main shaft constant speed driven tilt cylinder assembly is characterized in that the outer side surface of the ball joint (23) is provided with a plurality of curved groove raceways (16.1), and the plurality of curved groove raceways (16.1) are provided with balls (7); a corresponding raceway is provided between the cylinder body (9) and the plurality of curved groove raceways (16.1), and the torque is transmitted by the rolling cooperation of the balls (7) in the raceways to drive the cylinder body to rotate, and its implementation structure is as follows: The cylinder body (9) adopts an integrated structure, and 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 covered with a fixed retainer (8.1). The inner wall of the annular body (9.3) is a spherical surface and is provided with a curved surface raceway (24.1) corresponding to a plurality of curved surface groove type 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 plurality of curved surface groove type raceways (16.1) and the curved surface raceways (24.1) on the inner wall of the annular body (9.3) corresponding thereto. The main shaft (1) drives the ball joint (23) to rotate, and the torque is transmitted through the cooperation of the ball (7) and the curved surface groove type raceway (16.1), thereby driving the integrated structure cylinder body (9) to rotate.

[0014] The axial piston pump of the main shaft constant speed driven tilt cylinder assembly 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), and the side of the support ring (14) close to the ball joint (23) is a spherical surface that matches the ball joint, and a wave spring (13) is installed on the outside of the support ring (14), and the wave spring (13) acts on the ball joint (23) and the port plate (5) through the support ring (14).

[0015] The axial piston pump of the main shaft constant speed driven tilt cylinder assembly is characterized in that a plurality of oil through holes (20) that can communicate with the float cup (6) and the cylinder hole (30) are provided on the port plate (5), and the port plate (5) contacts each other toward the distribution plate (4) to form an end face fit to form a distribution pair; the plurality of oil through holes (20) are connected with the oil suction distribution hole (21.1) and the oil discharge distribution hole (21.2) on the distribution plate (4).

[0016] The axial piston pump of the main shaft constant speed driven tilt cylinder assembly is characterized in that the pump body comprises a front pump body (2.1) and a rear pump body (2.2) fixedly connected, and bearings (3) are respectively provided between the front pump body (2.1), the rear pump body (2.2) and the main shaft.

[0017] The axial piston pump of the main shaft constant speed driven tilt cylinder assembly is characterized in that the turntable (22) is mounted 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 confined in the ball socket (15.2).

[0018] The axial piston pump of the main shaft constant speed driven tilt cylinder assembly is characterized in that the turntable (22) is mounted 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 plunger second (10.3) is confined in the ball socket (15.2).

[0019] The present invention adds curved groove raceways and straight groove raceways and increases retaining frames at the contact surfaces between the ball joint of the main shaft and the cylindrical plate of the cylinder body, thereby forming a fixed / telescopic ball cage type constant speed transmission mechanism, thereby achieving completely equal speeds for the rotation speeds of the cylinder body and the main shaft.

[0020] The present invention designs a thin rod plunger, the spherical tail of the thin rod plunger 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 through a cover plate, the thin rod plunger can "float" in the float cup of the cylinder body, reducing the movement of the float cup, solving the problem of transmitting power between the float cup plunger pair through the cantilever structure, and reducing the lateral force and friction of the float cup.

[0021] The present invention designs an integrated cylinder body formed by an annular body and a port plate, and a thin-rod plunger 2 with a plunger ring. The center of mass of the cylinder body is fixed by the annular body, and a sealing surface is formed between the sealing ring of the thin-rod plunger 2 and the cylinder hole, so that the thin-rod plunger 2 floats in the cylinder body, thereby solving the limitation of the float pump under high speed conditions and widening the working conditions of the float pump.

[0022] Since the present invention realizes completely isochronous rotation of the cylinder body and the main shaft, it can effectively solve the "floating" movement of the float cup in the original float cup pump. This technical feature makes the present invention more adaptable to the high-speed driving conditions of the servo motor. Under high speed, the rotating component can reduce vibration and operate more stably. There is no "floating" movement of the cup body, which reduces the lateral force between the plunger pairs, reduces friction and wear problems, and is conducive to extending the service life of the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of Example 2 of the present invention.

[0025] Figure 3This is a schematic diagram of the structure of Example 3 of the present invention.

[0026] Figure 4 This is a cross-sectional view of the internal structure of Example 1 of the present invention.

[0027] Figure 5 This is a cross-sectional view of the internal structure of Example 2 of the present invention.

[0028] Figure 6 This is a cross-sectional view of the internal structure of Example 3 of the present invention.

[0029] Figure 7 It is a cross-sectional view of the cylinder structure of embodiments 1 and 2.

[0030] (a) Cross-sectional view of the cylinder structure of embodiment 1, (b) Cross-sectional view of the cylinder structure of embodiment 2 Figure 8 This is a cross-sectional view of the cylinder structure of Example 3.

[0031] Fig. 9 This is the main shaft installation structure diagram of Example 3.

[0032] Fig.10 It is a schematic diagram of the ball joint structure of the present invention.

[0033] (a) Ball joint structure of Example 3, (b) Ball joint structure of Example 2 Fig.11 This is a schematic diagram of the main shaft structure of Example 1 of the present invention.

[0034] Fig.12 This is a schematic diagram of the turntable cover structure of embodiments 2 and 3.

[0035] Fig.13 This is a cross-sectional view of the float cup plunger, turntable and float cup structure of Example 1.

[0036] Fig.14 This is a cross-sectional view of the thin rod plunger, the turntable and the float cup structure of Example 2.

[0037] Fig.15 This is a cross-sectional view of the thin rod plunger 2, the turntable and the cylinder structure of Example 3.

[0038] Fig.16 This is a cross-sectional structural diagram of the float cup plunger of Example 1.

[0039] Fig.17 This is a cross-sectional structural diagram of the thin rod plunger of Example 2.

[0040] Fig.18 This is a cross-sectional structural diagram of the thin rod plunger 2 of Example 3.

[0041] Fig.19 It is a schematic diagram of the assembly structure of the ball joint, fixed retainer, fixed cylindrical plate and ball in Example 1.

[0042] Fig. 20 It is a schematic diagram of the assembly structure of the ball joint, telescopic retainer, telescopic cylindrical plate and ball in Example 2.

[0043] Fig.21 Schematic diagram of the assembly structure of the ball joint, fixed retainer, annular body and ball in Example 3.

[0044] Fig. 22 This is a schematic diagram of the cross-sectional structure of the fixed cylindrical plate of Example 1.

[0045] Fig.23 This is a schematic diagram of the cross-sectional structure of the telescopic cylindrical plate of Example 2.

[0046] Fig.24 This is a schematic diagram of the cross-sectional structure of the annular body of Example 3.

[0047] Fig.25 This is a schematic diagram of the fixed cylindrical plate of Example 1.

[0048] Fig.26 This is a schematic diagram of the telescopic cylindrical plate structure of Example 2.

[0049] Fig. 27 This is a schematic diagram of the annular structure of Example 3.

[0050] Fig.28 This is a cross-sectional structural diagram of a fixed cage.

[0051] Fig.29 This is a cross-sectional structural diagram of a telescopic cage.

[0052] Fig.30 This is a schematic diagram of the distribution plate structure.

[0053] Numbers in the figure: 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, 8.1, fixed retainer, 8.2, telescopic retainer, 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 1, 10.3, thin rod plunger 2, 11, cover plate, 12, fixed plate, 13, wave spring, 14, Support ring, 15.1, cylindrical hole, 15.2, ball socket, 16.1, curved groove type raceway, 16.2 linear groove raceway, 17, bolt, 18, spherical through hole, 19, waist-shaped through hole, 20, oil through hole, 21.1, oil suction distribution hole, 21.2, oil discharge distribution hole, 22, turntable, 23, ball joint, 24.1, curved raceway, 24.2, linear raceway, 25, center through hole, 26, ball head, 27, spherical tail, 28, plunger ring, 29 cylindrical groove, 30, cylinder hole. DETAILED DESCRIPTION

[0054] See attached Figure 1-30 . Embodiment 1:

[0055] An axial piston pump with a main shaft constant speed driven tilt cylinder assembly includes a pump body 2, a main shaft 1 is rotatably mounted inside the pump body 2, an integrally formed turntable 22 is provided on the main shaft 1, integrally formed ball joints 23 are provided on both sides of the turntable 22 on the main shaft, a cylinder body 9 is installed on the outside of each ball joint 23, and a plunger mechanism is provided between the cylinder body 9 and the turntable 22; the plunger pump constitutes a symmetrical mirror structure.

[0056] A distribution plate 4 is provided on one side of each cylinder body 9 away from the rotary plate 22, and the distribution plate 4 is fixed to the inner wall of the pump body at a certain inclination angle; An oil inlet and an oil outlet are provided on the pump body 2, and an oil inlet / outlet flow channel is provided inside the pump body 2, and the oil inlet / outlet flow channel is respectively connected to the oil discharge distribution hole 21.2 and the oil suction distribution hole 21.1 of each distribution plate 4; The cylinder body 9 adopts a split structure, which is composed 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, and the fixed cylindrical plate 9.1 is installed between the port plate 5 and the inner circle of the fixed plate 12. A cylindrical hole 15.1 is correspondingly provided on the turntable 22. The axial end of the 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 float cup 6 corresponding to 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. The ball joint 23 is sleeved with a fixed retaining frame 8.1 on the outside and is located in the fixed cylindrical plate 9.1. The inner wall of the fixed cylindrical plate 9.1 is spherical and is provided with 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 retaining frame 8.1. The waist-shaped through hole 19 of the fixed retaining frame 8.1 is provided with a ball 7. 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, and the torque is transmitted through the cooperation of the ball 7 and the curved groove raceway 16.1, thereby driving the split-structure cylinder body 9 to rotate.

[0057] An oil inlet and an oil outlet are provided on the pump body 2, and an oil inlet / outlet flow channel is provided inside the pump body 2, and the oil inlet / outlet flow channel is respectively connected to the oil discharge distribution hole 21.2 and the oil suction distribution hole 21.1 of each distribution plate 4; The same number of cylindrical holes 15.1 are cross-shaped on the two sides of the rotating disk 22, and a plurality of floating cups 6 are correspondingly arranged on the cylinder body 9, corresponding to the cylindrical holes 15.1. The outer wall of the spherical tail 27 and the inner wall of the corresponding floating cup 6 are directly sealed by the spherical-cylindrical line contact; The port plate 5 is provided with a plurality of oil-passing holes 20, which contact each other toward the distribution plate 4 to form an end face fit to constitute a distribution pair; the plurality of oil-passing holes 20 are connected with the oil suction distribution hole 21.1 and the oil discharge distribution hole 21.2 on the distribution plate 4.

[0058] A support ring 14 is installed on the outside of the fixed cylindrical plate 9.1. The side of the support ring 14 close to the ball joint 23 is a spherical surface that matches the ball joint 23. A wave spring 13 is installed on the outside. The wave spring 13 acts on the ball joint 23 and the port plate 5 through the support ring 14, so that the cylinder body 9 is pressed against the distribution plate 4.

[0059] The pump body includes a front pump body 2.1 and a rear pump body 2.2, and 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 cup plungers 10.1 in total, 12 of which are installed on one side of the turntable 22, and are cross-installed and arranged on both sides of the turntable 22; the oil through hole 20 on the port plate 5 is connected with the oil circuit, an oil inlet and an oil outlet are provided on the pump body 2, and an inlet / outlet oil flow channel is provided inside the pump body 2, and the two ends of the inlet / outlet oil flow channel are respectively connected with the oil discharge distribution hole 21.2 and the oil suction distribution hole 21.1 of the distribution plate 4 on both sides.

[0060] When the center axis of the split cylinder body is at an angle with the axis of the spindle 1, the curved groove type raceway 16.1 at the center of the ball joint 23 of the spindle 1 and the curved groove type raceway 16.1 at the center of the fixed cylindrical plate 9.1 intersect at the angle bisector and pass through the inner / outer spherical center point of the fixed retainer 8.1, that is, the outer spherical surface of the ball joint 23 matches the inner spherical surface of the retainer, the inner spherical surface of the fixed cylindrical plate 9.1 matches the outer spherical surface of the fixed retainer 8.1 to form spherical contact, and the center of the ball 7 is always on the angle bisector; The main shaft 1 is rotated by the prime mover, and the rotating main shaft 1 rotates synchronously through the ball joint 23. The ball 7 clamped in the waist-shaped through hole 19 of the fixed retaining frame 8.1 can roll freely between the curved groove type raceway 16.1 on the ball joint 23 and the curved raceway 24.1 on the fixed cylindrical plate 9.1. When the intersection angle of the central axis between the split-structure cylinder body 9 and the main shaft 1 is constant, the ball 7 clamped in the waist-shaped through hole 19 of the fixed retaining frame 8.1 is positioned by the cross action of the curved groove type raceway 16.1 on the ball joint 23 and the curved raceway 24.1 of the fixed cylindrical plate 9.1, and the ball 7 transmits force and torque between the ball joint 23 and the fixed cylindrical plate 9.1.

[0061] The centers of all the balls 7 are located on the bisector of the angle between the central axes of the ball joint 23 and the fixed cylindrical plate 9.1, so that the main shaft 1 can synchronously drive the split structure cylinder to rotate at a constant speed. During this period, the cylindrical head of the float cup 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 cup plunger 10.1 and the inner wall of the corresponding float cup 7 are directly sealed through the spherical-cylindrical line contact. Example 2

[0062] An axial piston pump with a main shaft driving a tilt cylinder assembly at a constant speed, comprising a pump body 2, a main shaft 1 rotatably mounted in the pump body 2, a turntable 22 being arranged on the main shaft 1, a ball joint 23 being arranged on one or both sides of the turntable 22 on the main shaft, a cylinder body 9 being mounted on the outer side of each ball joint 23, and a plunger mechanism being arranged between the cylinder body 9 and the turntable 22; A distribution plate 4 is provided on one side of each cylinder body 9 away from the rotary plate 22, and the distribution plate 4 is fixed to the inner wall of the pump body at a certain inclination angle; An oil inlet and an oil outlet are provided on the pump body 2, and an oil inlet / outlet flow channel is provided inside the pump body 2, and the oil inlet / outlet flow channel is respectively connected to the oil discharge distribution hole 21.2 and the oil suction distribution hole 21.1 of each distribution plate 4; The cylinder body 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 port plate 5 and the inner circle of the fixed plate 12, and a ball socket 15.2 is correspondingly provided on the turntable 22; The ball joint 23 is sleeved with a telescopic retainer 8.2 on the outside, which is located on the inside of the telescopic barrel plate 9.2. The inner wall of the telescopic barrel plate 9.2 is a cylindrical surface and is provided with a linear raceway 24.2 corresponding to the multiple linear groove raceways 16.2. The telescopic retainer 8.2 is provided with 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 linear groove raceway 16.2 and the linear raceway 24.2 on the inner wall of the telescopic barrel plate 9.2. The main shaft 1 drives the ball joint 23 to rotate, and the torque is transmitted through the cooperation of the ball 7 and the linear groove raceway 16.3, thereby driving the split-structure cylinder body 9 to rotate.

[0063] When the ball socket 15.2 is used, it needs to be installed in conjunction with a thin rod plunger 10.2 having a central through hole 25. The turntable 22 is installed with a cover plate 11 through a bolt 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. One axial end of the thin rod plunger 10.2 is a ball head 26, and the ball head 26 of the thin rod plunger 10.2 is limited in 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 shape 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.

[0064] When the central axis of the split-structure cylinder body 9 is at an angle with the axis of the main shaft 1, the linear groove raceway 16.2 of the ball joint 23 of the main shaft 1 and the linear raceway 24.2 of the telescopic cylindrical plate 9.2 intersect at the angle bisector and pass through. At this time, the center of the inner spherical surface of the telescopic retainer 8.2 cooperates with the outer surface of the ball joint 23, and the center of the outer spherical surface 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 is in line contact with the cylindrical surface of the telescopic cylindrical plate 9.2.

[0065] The main shaft 1 is rotated by the drag of the prime mover, and the rotating main shaft 1 rotates synchronously with the ball joint 23. The ball 7 clamped in the waist-shaped through hole 19 of the telescopic retaining frame 8.2 can roll freely between the linear groove raceway 16.2 on the ball joint 23 and the linear raceway 24.2 on the telescopic cylindrical plate 9.2. When the intersection angle of the central axis between 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 retaining frame 8.2 is positioned by the cross action of the linear groove raceway 16.2 on the ball joint 23 and the linear raceway 24.2 on the telescopic cylindrical plate 9.2, and the ball 7 transmits force and torque between the ball joint 23 and the telescopic cylindrical plate 9.2.

[0066] The centers of all the balls 7 are located on the bisector of the angle between the central axes of the ball joint 23 and the telescopic cylindrical plate 9.2, so that the main shaft 1 can synchronously drive the split-structure cylinder to rotate at a constant speed, and axial displacement is also allowed, that is, the balls can roll axially on the linear groove raceway 16.2, which can compensate for the axial movement between the ball joint 23 and the split-structure cylinder due to 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, and 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, and the thin rod plunger 10.2 can "float" in the float cup of the split-structure cylinder. Example 3

[0067] An axial piston pump with a main shaft driving a tilt cylinder assembly at a constant speed, comprising a pump body 2, a main shaft 1 rotatably mounted in the pump body 2, a turntable 22 being arranged on the main shaft 1, a ball joint 23 being arranged on one or both sides of the turntable 22 on the main shaft, a cylinder body 9 being mounted on the outer side of each ball joint 23, and a plunger mechanism being arranged between the cylinder body 9 and the turntable 22; A distribution plate 4 is provided on one side of each cylinder body 9 away from the rotary plate 22, and the distribution plate 4 is fixed to the inner wall of the pump body at a certain inclination angle; An oil inlet and an oil outlet are provided on the pump body 2, and an oil inlet / outlet flow channel is provided inside the pump body 2, and the oil inlet / outlet flow channel is respectively connected to the oil discharge distribution hole 21.2 and the oil suction distribution hole 21.1 of each distribution plate 4; The cylinder body 9 adopts an integrated structure, which is composed of a port plate 5 and an annular body 9.3 fixedly connected. A cylinder hole 30 is provided on the annular body 9.3, and a ball socket 15.2 is correspondingly provided on the turntable 22. 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 10.3 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, and a plunger ring 28 installed in an annular groove provided on the outer wall of the spherical tail 27 is movably sealed with the inner wall of the corresponding cylinder hole 30.

[0068] The ball joint 23 is sleeved with a fixed retaining frame 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 the multiple curved groove-type raceways 16.1, and a corresponding waist-shaped through hole 19 is opened on the fixed retaining frame (8.1). The waist-shaped through hole 19 on the fixed retaining frame (8.1) is provided with a ball 7, and the ball 7 rolls between the multiple curved groove-type raceways 16.1 and the corresponding curved raceway 24.1 on the inner wall of the annular body 9.3. The main shaft 1 drives the ball joint 23 to rotate, and the torque is transmitted through the cooperation of the ball 7 and the curved groove-type raceway 16.1, thereby driving the integrated structural cylinder body 9 to rotate.

[0069] When there is an angle between the center axis of the cylinder body 9 and the axis of the main shaft 1, the curved groove type raceway 16.1 at the center of the ball joint 23 of the main shaft 1 and the curved raceway 24.1 at the center of the cylinder body 9 intersect at the angle bisector plane and pass through the inner and outer spherical center points of the fixed retainer 8.1, that is, the outer spherical surface of the ball joint 23 and the inner spherical surface of the fixed retainer 9.1, the inner spherical surface of the cylinder body 9 and the outer spherical surface of the fixed retainer 9.1 are matched as spherical contact, and the center of the ball 7 is always in the angle bisector plane; 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 retainer is 6 each, and it can also be other numbers depending on the size of the transmitted force and torque.

[0070] The main shaft 1 is rotated by the prime mover, and the main shaft ball joint 23 rotates synchronously. The ball 7 clamped in the waist-shaped through hole 19 of the fixed retaining frame 8.1 can roll freely between the curved groove type raceway 16.1 on the ball joint 23 and the curved raceway 24.1 on the cylinder body 9. When the intersection angle of the central axis between the cylinder body and the main shaft 1 is constant, the ball 7 clamped in the waist-shaped through hole 19 of the fixed retaining frame 8.1 is positioned by the cross action of the ball joint 23 and the integrated structure cylinder body 9, and the ball 7 transmits force and torque between the ball joint 23 and the cylinder body 9.

[0071] The centers of all the balls 7 are located on the plane bisecting the angle between the central axes of the ball joint 23 and the cylinder body 9, so that the main shaft 1 can synchronously drive the cylinder body to rotate at a constant speed. During this period, the ball head 26 of the thin rod plunger 10.3 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 ball tail 27 of the thin rod plunger 10.3, and a seal is formed between the inner wall of the cylinder hole 30 of the corresponding cylinder body through spherical-cylindrical line contact.

[0072] When the pump body is in the oil suction rotation cycle, the thin rod plunger 10.3, under the action of the rotating disk 22 and the corresponding cylinder hole 30 in the cylinder body 9, contacts the inner wall of the corresponding cylinder hole 30 through the spherical tail 27 to form a seal, so that the volume of the sealed working chamber of the corresponding cylinder hole of the cylinder body continues to increase, generating a partial vacuum. When the cylinder hole 30 forming a partial vacuum rotates to the position where the oil passage opening 20 is aligned with the oil suction distribution hole 21.1 of the distribution plate 4, the low-pressure oil from the hydraulic system is sucked into the cylinder hole 30 forming a partial vacuum through the oil suction distribution hole 21.1 of the distribution plate 4.

[0073] When 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 hole 30 of the cylinder body 9 behind the thin rod plunger 10.3 decreases, so the oil pressure in the cylinder hole 30 of the cylinder body increases to form high-pressure oil. When the cylinder body rotates until the oil passage opening 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.

[0074] In the embodiment of the present patent, the plungers are cross-installed and arranged on both sides of the turntable 22. If the plungers are axially symmetrically arranged on both sides of the turntable 22, it should also fall within the protection scope of the present patent.

[0075] As a specific case, an axial piston pump with a main shaft driving a tilt cylinder assembly at a constant speed, as a single cylinder structure, includes a pump body 2, a main shaft 1 is rotatably mounted in the pump body 2, an integrally formed turntable 22 is provided on the main shaft 1, an integrally formed ball joint 23 is provided on one side of the turntable 22 on the main shaft, a cylinder body 9 is installed outside the ball joint 23, and a plunger mechanism is provided between the cylinder body 9 and the turntable 22; A distribution plate 4 is provided on one side of each cylinder body 9 away from the rotary plate 22, and the distribution plate 4 is fixed to the inner wall of the pump body at a certain inclination angle; the rest is the same as the ball joint structure provided on both sides.

Claims

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

2. The axial piston pump of the main shaft constant speed driving tilt 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 body (9) adopts a split structure, and is composed 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 port plate (5) and the inner ring of the fixed plate (12). The rotating disk (22) is provided with a cylindrical hole (15.1) correspondingly. The axial end of the float cup plunger (10.1) is a cylindrical head. 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), and forms a cantilever structure corresponding to the rotating disk (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) is retained in the float cup (6) corresponding to the cylinder body (9), and the outer wall of the spherical tail (27) and the inner wall of the corresponding float cup (6) are movably sealed; S2: The cylinder body (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 port plate (5) and the fixed plate (12) inner rings. The turntable (22) is provided with a corresponding ball socket (15.2) and a thin rod plunger (10.2) having 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 limited in the ball socket (15.2), the spherical tail (27) has a cylindrical groove (29) coaxial with the plunger, and the spherical tail (27) of each thin rod plunger (10.2) is retained 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 movably sealed; S3: The cylinder body (9) is composed of a port plate (5) and an annular body (9.3), a cylinder hole (30) is provided on the annular body (9.3), a ball socket (15.2) is correspondingly provided on the turntable (22), one axial end of a thin rod plunger (10.3) having 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), and a plunger ring (28) installed in an annular groove provided on the outer wall of the spherical tail (27) is movably sealed with the inner wall of the corresponding cylinder hole (30).

3. The axial piston pump of the main shaft constant speed driving tilt cylinder assembly according to claim 1, characterized in that: The outer side surface of the ball joint (23) is provided with a plurality of curved groove raceways (16.1), and balls (7) are arranged in the plurality of curved groove raceways (16.1); a corresponding raceway is arranged between the cylinder body (9) and the plurality of curved groove raceways (16.1), and the torque is transmitted by the rolling cooperation of the balls (7) in the raceways to drive the cylinder body to rotate, and its implementation structure is as follows: The cylinder body (9) adopts a split structure, and is composed 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), and the fixed cylindrical plate (9.1) is installed between the inner rings of the port plate (5) and the fixed plate (12); The ball joint (23) is sleeved with a fixed retainer (8.1) on the outside and is located inside the fixed cylindrical plate (9.1). The inner wall of the fixed cylindrical plate (9.1) is a spherical surface and is provided with a curved surface raceway (24.1) corresponding to the plurality of curved surface 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 surface groove raceway (16.1) and the curved surface 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, and the torque is transmitted through the cooperation of the ball (7) and the curved surface groove raceway (16.1), thereby driving the cylinder body of the split structure (9) to rotate.

4. The axial piston pump of the main shaft constant speed driving tilt cylinder assembly according to claim 1, characterized in that: The outer side surface of the ball joint (23) is provided with a plurality of linear grooved roller tracks (16.2); balls (7) are arranged in the plurality of linear grooved roller tracks (16.2); roller tracks corresponding to the plurality of linear grooved roller tracks (16.2) are arranged between the cylinder body (9) and the plurality of linear grooved roller tracks (16.2); torque is transmitted by the rolling cooperation of the balls (7) in the roller tracks to drive the cylinder body (9) to rotate, and the implementation structure is as follows: The cylinder body (9) adopts a split structure, and 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), and the telescopic cylindrical plate (9.2) is installed between the port plate (5) and the fixed plate (12). The outer side of the ball joint (23) is covered with a telescopic retainer (8.2) and is located on the inner side of the telescopic cylindrical plate (9.2). The inner wall of the telescopic cylindrical plate (9.2) is a cylindrical surface and is provided with a The linear raceways (24.2) corresponding to the plurality of linear groove raceways (16.2) are provided with corresponding waist-shaped through holes (19) on the telescopic retainer (8.2). A ball (7) is arranged in the waist-shaped through hole (19) of the telescopic retainer (8.2). The ball (7) rolls between the linear groove raceway (16.2) and the linear 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, and the torque is transmitted through the cooperation of the ball (7) and the linear groove raceway (16.3), thereby driving the cylinder body (9) of the split structure to rotate.

5. The axial piston pump of the main shaft constant speed driving tilt cylinder assembly according to claim 1, characterized in that: The outer side surface of the ball joint (23) is provided with a plurality of curved groove raceways (16.1), and balls (7) are arranged in the plurality of curved groove raceways (16.1); raceways corresponding to the plurality of curved groove raceways (16.1) are arranged between the cylinder body (9) and the plurality of curved groove raceways (16.1), and torque is transmitted by rolling cooperation of the balls (7) in the raceways to drive the cylinder body to rotate, and its implementation structure is as follows: The cylinder body (9) adopts an integrated structure, and 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 covered with a fixed retainer (8.1). The inner wall of the annular body (9.3) is a spherical surface and is provided with a curved surface raceway (24.1) corresponding to a plurality of curved surface groove type 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 plurality of curved surface groove type raceways (16.1) and the curved surface raceways (24.1) on the inner wall of the annular body (9.3) corresponding thereto. The main shaft (1) drives the ball joint (23) to rotate, and the torque is transmitted through the cooperation of the ball (7) and the curved surface groove type raceway (16.1), thereby driving the integrated structure cylinder body (9) to rotate.

6. The axial piston pump of the main shaft constant speed driving tilt cylinder assembly according to claim 1, 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) close to the ball joint (23) is a spherical surface that matches 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. The axial piston pump of the main shaft constant speed driving tilt cylinder assembly according to claim 2, characterized in that: The port plate (5) is provided with a plurality of oil-passing holes (20) that can communicate with the float cup (6) and the cylinder hole (30); the port plate (5) contacts the distribution plate (4) to form an end face fit, thereby forming a distribution pair; the plurality of oil-passing holes (20) are connected with the oil suction distribution hole (21.1) and the oil discharge distribution hole (21.2) on the distribution plate (4).

8. The axial piston pump of the main shaft constant speed driving tilt cylinder assembly according to claim 1, characterized in that: The pump body comprises a front pump body (2.1) and a rear pump body (2.2) which are fixedly connected, and bearings (3) are respectively provided between the front pump body (2.1), the rear pump body (2.2) and the main shaft.

9. The axial piston pump of the main shaft constant speed driving tilt cylinder assembly according to claim 2, characterized in that: The turntable (22) is mounted with a cover plate (11) via 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. The axial piston pump of the main shaft constant speed driving tilt cylinder assembly according to claim 2, characterized in that: The turntable (22) is mounted with a cover plate (11) via bolts (17); the spherical through hole (18) of the cover plate (11) corresponds one-to-one to the ball socket (15.2) of the turntable (22); and the ball head (26) of the thin rod plunger 2 (10.3) is confined in the ball socket (15.2).

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