Synchronous type swash plate plunger pump of through shaft type bevel gear train

Abstract

The invention discloses a through shaft type bevel gear train synchronous type rotating and swash plate plunger pump which comprises a shell, a driving shaft and plunger assemblies, a first swash plate and a second swash plate are symmetrically arranged in the shell, a first pressing plate assembly and a second pressing plate assembly are arranged on the two swash plates respectively, a spherical hinge is arranged between the assemblies, the driving shaft penetrates through all the components, and an oil inlet and an oil outlet are formed in the shell. The synchronous gear ring is fixedly connected with the shell, and the first swash plate and the second swash plate are fixed on the driving shaft through splines, can rotate and are respectively connected with a kinematic pair of the pressure plate assembly. And the plunger assembly comprises a plunger and a plunger barrel which are respectively arranged between the pressure plate assemblies of the two swash plates. The synchronous gear ring is arranged between the pressure plate assemblies, side teeth on the two sides of the synchronous gear ring are matched with bevel gear disc teeth, a bevel gear train is adopted to stabilize a core part of the plunger pump, it is guaranteed that the pressure plate assemblies only swing and do not rotate, the plunger assemblies are driven to reciprocate in the rotating process of the main shaft, and medium suction and discharge are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of plunger pumps, and in particular relates to a through-shaft bevel gear system synchronous swash plate plunger pump. Background Art

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil suction and oil pressure. This pump has many advantages such as high rated pressure, compact structure, high efficiency and convenient flow regulation. Therefore, it is widely used in high pressure, large flow and flow regulation occasions, and is widely used in aviation, shipbuilding, industry and other fields. At present, with the rise of various trends such as electrification, compactness and energy saving of various main engines, the performance of plunger pumps is required to further develop towards wide speed, high pressure and high efficiency.

[0003] At present, the rated pressure and speed range of plunger pumps are subject to some constraints. The reasons for this phenomenon include: 1. There is a large lateral force at the plunger pair of axial piston pumps and motors, which requires the dynamic pressure field balance of the oil film in the gap. The dynamic effect is insufficient under low-speed conditions and it is difficult to effectively support; 2. The plunger cylinder cylindrical seal with a long contact length is difficult to stably exist in the oil film under high-speed conditions; 3. The rotating components of traditional plunger motors include cylinders, plungers and other components, with a large inertia moment and poor characteristics under conditions of rapid speed changes; 4. Conical plunger and connecting rod type helical axis plunger motors need to be driven by connecting rods and conical plungers, and there is a large impact during operation. In addition, it is necessary to consider the motion interference between the connecting rod plunger and the cylinder cone plunger. The strength of the connecting rod and the cylinder is also affected to a certain extent. Therefore, it is easy to cause wear and strength problems at the plunger pair or the connecting rod plunger under strong impact conditions; 5. Traditional plunger pump motors will stir the oil in the housing under high-speed conditions, causing additional energy loss.

[0004] Therefore, a through-shaft bevel gear synchronous swash plate plunger pump is proposed to adapt to the trend of high pressure, wide speed and low rotational inertia of the plunger pump. Summary of the invention

[0005] The present invention provides a through-axis bevel gear synchronous swash plate plunger pump to adapt to the trend of high pressure, wide speed, high frequency speed change and high power density ratio of the plunger pump, including: a housing, a driving shaft and a plunger assembly, an oil inlet and an oil outlet are arranged on the housing, a synchronous gear ring is arranged in the housing, a first pressure plate assembly and a second pressure plate assembly are symmetrically arranged on both sides of the synchronous gear ring, teeth meshing with the synchronous gear ring are arranged on the edges of the first pressure plate assembly and the second pressure plate assembly, the first pressure plate assembly and the second pressure plate assembly are butt-jointed by a ball joint, a first swash plate and a second swash plate are respectively arranged on the working surfaces of the first pressure plate assembly and the second pressure plate assembly, the driving shaft passes through the housing and the first swash plate, the first pressure plate assembly, the second swash plate, the second pressure plate assembly and the ball joint between the two groups of pressure plate assemblies inside the housing, the first swash plate and the second swash plate are driven by the driving shaft, a plurality of plunger assemblies are arranged between the first swash plate and the second swash plate, and one of the first swash plate and the second swash plate is used as an oil distribution plate.

[0006] Preferably, the shell and the synchronous gear ring are fixedly installed, the shell includes a left half shell and a right half shell, teeth are arranged on the annular end faces on both sides of the synchronous gear ring, the right side of the first bevel gear disc and the left side of the second bevel gear disc are arranged with teeth matching with the teeth on both sides of the synchronous gear ring to form a bevel gear train, constraining the freedom of the first pressure plate assembly and the second pressure plate assembly, a fixing flange is arranged on the periphery of the synchronous gear ring, and the fixing flange is fixed at the buckling position of the left half shell and the right half shell during installation, sealing rings are arranged on both sides of the fixing flange, and are fixedly connected to the shell by bolts.

[0007] Preferably, the shell and the synchronous gear ring are fixedly installed, the shell includes a left half shell and a right half shell, the synchronous gear ring is divided into a left half gear ring and a right half gear ring along the axis, the left half gear ring is integrally formed with the left half shell, and the right half gear ring is integrally formed with the right half shell, the annular end faces of the left half gear ring and the right half gear ring in contact are flush with the shell buckle when the shell is buckled, and the left half gear ring and the right half gear ring are tightly fitted, a sealing ring is provided at the fitting position, the non-contact annular end faces of the left half gear ring and the right half gear ring are both provided with lateral teeth, the right side of the first bevel gear disk and the left side of the second bevel gear disk are both provided with teeth matching with the teeth on both sides of the synchronous gear ring, forming a bevel gear system to constrain the freedom of the first pressure plate assembly and the second pressure plate assembly.

[0008] Preferably, the housing and the synchronous gear ring are fixedly installed, and the housing is also provided with an end cover, and a sealing ring is provided at the buckling position of the end cover.

[0009] Preferably, multi-stage countersunk holes are arranged on the left and right sides of the shell, the first swash plate is fixed on the drive shaft by a key connection, the first swash plate is arranged in the rightmost countersunk hole on the left side of the shell, a bearing is sleeved in the countersunk hole, the first swash plate can rotate under the drive of the drive shaft, an inclined working surface is arranged on the right side of the first swash plate, a first pressure plate assembly is arranged on the inclined working surface, the first swash plate is connected to the kinematic pair of the pressure plate assembly, the second swash plate is fixed and penetrated on the drive shaft by a key connection, the second swash plate is arranged in the leftmost countersunk hole on the right side of the shell, a bearing is sleeved in the countersunk hole, the second swash plate can rotate under the drive of the drive shaft, an inclined working surface is arranged on the left side of the second swash plate, a second pressure plate assembly is arranged on the inclined working surface, and the second swash plate is connected to the kinematic pair of the pressure plate assembly.

[0010] Preferably, the first pressure plate assembly includes a first bevel gear plate and a first pressure plate, a plurality of ball seats are correspondingly arranged on the mounting surface of the first bevel gear plate, and a plurality of circular holes are arranged on the first pressure plate corresponding to the ball seats on the first bevel gear plate; the second pressure plate assembly includes a second bevel gear plate and a second pressure plate, a plurality of ball seats are correspondingly arranged on the mounting surface of the second bevel gear plate, and a plurality of circular holes are arranged on the second pressure plate corresponding to the ball seats on the second bevel gear plate.

[0011] Preferably, an annular platform with an inner spherical groove is provided on both the first pressure plate and the second pressure plate, the annular platform on the first pressure plate is arranged opposite to the annular platform on the second pressure plate, and the ball joint is arranged in the inner spherical groove of the annular platforms arranged opposite to each other on the first pressure plate and the second pressure plate.

[0012] Preferably, the plunger assembly includes a corresponding plunger and a plunger barrel, the ball head at the end of the plunger is arranged in the ball seat between the first bevel gear disk and the first pressure plate, the ball head at the end of the plunger barrel is arranged in the ball seat between the second bevel gear disk and the second pressure plate, and the plunger and the plunger barrel are docked in a cylindrical pair connection manner.

[0013] Preferably, an oil inlet hole and an oil outlet hole are provided in the housing, and the oil inlet hole and the oil outlet hole correspond to the oil inlet passage and the oil outlet passage on the first slant plate or the second slant plate.

[0014] The present invention uses a bevel gear system to stabilize the core components of the plunger pump, ensuring that the bevel gear plate and the pressure plate only swing but do not rotate. The friction force of the swash plate on the bevel gear plate is directly offset by the bevel gear meshing part and will not be transmitted to the ball joint position of the plunger assembly, thereby optimizing the force structure; by only rotating the drive shaft and the swash plate, rotational dynamic balance can be achieved, rotational inertia can be reduced, and rotation speed and motion stability can be increased; the double ball pair connection structure of the plunger assembly can reduce the lateral force of the plunger, and it can operate smoothly even under high pressure, high speed, low speed, low viscosity medium and other working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the overall structure of the present invention; Figure 2 is a cross-sectional view of the internal structure of the present invention; Figure 3 is a cross-sectional view of a shell of the present invention; Figure 4 It is a schematic diagram of the overall structure of the gear ring of the present invention; Figure 5 is a left side view of the second swash plate of the present invention; Figure 6 is a cross-sectional view of the overall structure of the second embodiment of the present invention; Figure 7 is a cross-sectional view of the overall structure of the third embodiment of the present invention; 1-housing, 11-connecting flange, 12-multi-stage countersunk, 101-left half housing, 102-right half housing, 103-end cover, 2-drive shaft, 21-docking oil passage, 3-first inclined plate, 4-second inclined plate, 31-first pressure plate assembly, 311-first bevel gear plate, 312-first pressure plate, 41-second pressure plate assembly, 411-second bevel gear plate, 412-second pressure plate, 413-sprocket oil passage, 42-oil inlet passage, 43-oil outlet passage, 5-plunger assembly, 51-plunger, 52-plunger cylinder, 521-plunger oil passage, 6-ball joint, 7-synchronizing gear ring, 71-fixing flange, 8-oil inlet, 9-oil outlet. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figure 1 , Figure 2 , Figure 5As shown, a through-axis bevel gear synchronous swash plate plunger pump includes a housing 1, a drive shaft 2, a first swash plate 3, a second swash plate 4, a first pressure plate assembly 31, a second pressure plate assembly 41, a plunger assembly 5, a ball joint 6 and a synchronous gear ring 7. The housing 1 is formed by buckling a left half housing and a right half housing, and an annular flange is arranged at the buckling position. A plurality of screw holes are arranged in a circumferential array on the flange, and bolts are inserted into the screw holes for fixing. An installation space is formed inside the left half housing and the right half housing, and the first swash plate 3 is arranged in the installation space of the left half housing, and the second swash plate 4 is arranged in the installation space of the right half housing. The first swash plate 3 and the second swash plate 4 are symmetrically arranged, and an swash plate 3 is arranged on the right side of the first swash plate 3. Inclined working surface, a first pressure plate assembly 31 is arranged on the inclined working surface of the first inclined plate 3, the first pressure plate assembly 31 comprises a first bevel gear plate 311 and a first pressure plate 312, a circle of lateral teeth is arranged on the outer edge of the first bevel gear plate 311, a plurality of ball seats are circumferentially distributed on the right mounting surface of the first bevel gear plate 311, a ring platform is arranged in the middle of the first pressure plate 312, a plurality of circular holes are arranged on the disk surface of the first pressure plate 312, a plurality of circular holes are adapted to the corresponding ball seats on the first bevel gear plate 311, a groove with an inner spherical surface is arranged at the front end of the ring platform of the first pressure plate 312, the inclined working surface of the first inclined plate 3 is in surface contact with the left side surface of the first bevel gear plate 311, and the first bevel gear plate 31 The first pressure plate 312 is adapted to be arranged on the right side of the mounting surface of 1; an oil inlet passage 42 and an oil outlet passage 43 are respectively arranged inside the second slant plate 4, an annular cavity is formed at the connection between the right side of the second slant plate 4 and the housing 1, the oil inlet passage 42 is directly connected to the annular cavity, the oil outlet passage 43 is arranged inside the second slant plate 4, a docking oil passage 21 is arranged inside the drive shaft 2 to dock with the oil outlet passage 43, sealing rings are arranged on both sides of the docking, and when the drive shaft 2 is installed, the oil outlet passage 43 needs to correspond to the docking oil passage 21 in the drive shaft 2, an inclined working surface is arranged on the left side of the second slant plate 4, and a second pressure plate assembly 41 is arranged on the inclined working surface of the second slant plate 4, and the second pressure plate assembly 41 includes a second bevel gear plate 41 1 and the second pressure plate 412, a circle of lateral teeth is set on the outer edge of the second bevel gear plate 411, a plurality of ball seats are distributed circumferentially on the left mounting surface of the second bevel gear plate 411, a ring platform is set in the middle of the second pressure plate 412, a plurality of circular holes are set on the disk surface of the second pressure plate 412, and the plurality of circular holes are adapted to the ball seats on the corresponding second bevel gear plate 411, a groove with an inner spherical surface is set at the front end of the ring platform of the second pressure plate 412, the inclined working surface of the second inclined plate 4 is in surface contact with the right side of the second bevel gear plate 411, a pressure plate 53 is adapted to be set on the left side of the mounting surface of the second bevel gear plate 411, and a ball joint 6 is set in the groove with an inner spherical surface at the front end of the first pressure plate 312 and the second pressure plate 412;A plurality of plunger assemblies 5 are arranged between the first slant plate 3 and the second slant plate 4. The plunger assemblies 5 include a plunger 51 and a plunger cylinder 52 that are adapted to be matched. The ball head at the end of the plunger 51 is arranged in a ball seat between the first bevel gear plate 311 and the first pressure plate 312. The ball head at the end of the plunger cylinder 52 is arranged in a ball seat between the second bevel gear plate 411 and the second pressure plate 412. The plunger 51 is connected to the plunger cylinder 52 in a cylindrical pair connection manner. The ball head end of the plunger cylinder 52 is provided with a plunger oil passage 521, which is connected to the gear oil passage 413 on the second bevel gear plate 411. ;

[0018] like Figure 1 , Figure 3 and Figure 4 As shown, a synchronous gear ring 7 is fixedly arranged in the installation space of the housing 1, and the synchronous gear ring 7 is arranged around the first bevel gear plate 311 and the second bevel gear plate 411. The annular end surfaces on both sides of the synchronous gear ring 7 are provided with teeth that mesh with the teeth on the edges of the first bevel gear plate 311 and the second bevel gear plate 411 respectively. A fixed flange 71 is arranged on the periphery of the synchronous gear ring 7, which can adapt to the flange at the buckling position of the housing 1 and be fixedly connected by bolts.

[0019] like Figure 1 , Figure 2 , Figure 3 As shown, the drive shaft 2 sequentially passes through the first slant plate 3, the first pressure plate assembly 31, the ball joint 6, the second pressure plate assembly 41, and a through hole is set on the second slant plate 4, a connecting flange 11 is set on the outer side of the left half shell, an axial hole is set at the center of one side of the connecting flange 11 of the left half shell 101, and a multi-stage countersunk hole 12 is set inside. The multi-stage countersunk hole 12 is specifically three-stage, and the plunger sealing ring and the bearing are sequentially nested in the multi-stage countersunk hole 12 of the left half shell 101 from left to right. The left side of the first slant plate 3 is set in the multi-stage countersunk hole 12 of the left half shell 101, and the inner side of the right half shell 102 is set with a multi-stage countersunk hole 12 corresponding to the left half shell 101. 2, the plunger seal ring and the bearing are nested in sequence from right to left, the right side of the second swash plate 4 is arranged in the multi-stage countersunk hole 12 of the right half shell 102, the drive shaft 2 is fixed to the first swash plate 3 and the second swash plate 4 by any means such as splines, flat keys or interference fit, when the drive shaft 2 rotates, the left side of the first swash plate 3 cooperates with the bearing in the multi-stage countersunk hole 12 of the left half shell 101, and the right side of the second swash plate 4 cooperates with the bearing in the multi-stage countersunk hole 12 of the right half shell 102, at this time, the rotation of the drive shaft 2 can drive the first swash plate 3 and the second swash plate 4 to rotate; an oil inlet 8 is arranged at the lower right side of the right half shell 102, and an oil outlet 9 is arranged in the middle.

[0020] When in use, the first swash plate 3 and the second swash plate 4 are symmetrically arranged, the left side of the first swash plate 3 cooperates with the bearing in the multi-stage countersunk hole 12 of the left half shell 101, and the right side of the second swash plate 4 cooperates with the bearing in the multi-stage countersunk hole 12 of the right half shell 102. When the drive shaft 2 rotates, the first swash plate 3 and the second swash plate 4 rotate with the drive shaft 2.

[0021] Since the swash plate has an inclination angle with the axis of rotation, its end face exhibits periodic undulating motion. Therefore, when the first swash plate 3 and the second swash plate 4 move, the first bevel gear plate 311 and the second bevel gear plate 411 synchronously perform undulating motion around the ball joint 6. The teeth on both sides of the synchronous gear ring 7 mesh with the teeth on the outer edges of the first bevel gear plate 311 and the second bevel gear plate 411 to form a gear train. At the low point of the swash plate, the synchronous gear ring 7 always maintains a meshing state with the teeth on the outer edges of the bevel gear plate, which limits the rotation of the pressure plate assembly and enables the first bevel gear plate 311 and the second bevel gear plate 411 to rise and fall synchronously. At the same time, the plunger assembly 5 between the first pressure plate assembly 31 and the second pressure plate assembly 41 also performs axial reciprocating motion with the rise and fall of the first bevel gear plate 311 and the second bevel gear plate 411.

[0022] When the high point of the swash plate pushes the plunger assembly 5, the plunger 51 is squeezed into the plunger tube 52 by the pressure plate assembly; when the low point of the swash plate stretches the plunger assembly 5, the plunger 51 is stretched out of the plunger tube 52 under the traction of the pressure plate assembly. When the motor fixed on the left connecting flange 11 of the housing 1 drives the drive shaft 2 to rotate, the plunger assembly 5 opens and closes regularly to form two oil inlet and outlet paths. The oil inlet path is sucked in from the oil inlet port 8, enters the oil inlet passage 42 inside the second swash plate 4 through the annular cavity, and enters the plunger assembly 5 cavity through the gear oil passage 413 and the plunger oil passage 521; the oil outlet path is to push the oil into the plunger oil passage 521 through the closing of the plunger assembly 5, enter the oil outlet passage 43 and the docking oil passage 21 through the gear oil passage 413, and finally enter the oil outlet port 9 for discharge.

[0023] Embodiment 2: like Figure 6 As shown, the only difference between the second embodiment and the first embodiment is that the gear ring of the synchronous gear ring 7 in the second embodiment is divided into two along the axial direction, the left half gear ring is integrally formed with the left half shell 101, and the right half gear ring is integrally formed with the right half shell 102, the left half gear ring is arranged at the buckling part of the left half shell 101, and the right half gear ring is arranged at the buckling part of the right half shell 102, and the non-contact annular end faces between the left half gear ring and the right half gear ring are both provided with lateral teeth that can be respectively engaged with the teeth on the edges of the first bevel gear disk 311 and the second bevel gear disk 411 to form a gear train, and the annular end faces of the left half gear ring and the right half gear ring that are in contact when the shell 1 is buckled are in a tightly fitted state.

[0024] Embodiment three: like Figure 7 As shown, the only difference between the third embodiment and the first embodiment is that the housing 1 in the third embodiment includes an integral housing and an end cover 103, the housing 1 and the synchronous gear ring 7 are fixedly installed by a keyway, a sealing ring is arranged at the buckling position of the end cover 103, an oil inlet 8 and an oil outlet 9 are arranged on the end cover 103, and corresponding multi-stage countersunk holes 12 are arranged in the integral housing and the end cover 103.

Claims

1. A through-axis bevel gear synchronous swash plate piston pump, comprising a housing (1), a drive shaft (2) and a piston assembly (5), wherein an oil inlet (8) and an oil outlet (9) are provided on the housing (1), and characterized in that: A synchronous gear ring (7) is arranged in the housing (1), and a first pressure plate assembly (31) and a second pressure plate assembly (41) are symmetrically arranged on both sides of the synchronous gear ring (7). Teeth meshing with the synchronous gear ring (7) are arranged on the edges of the first pressure plate assembly (31) and the second pressure plate assembly (41). The first pressure plate assembly (31) and the second pressure plate assembly (41) are butt-jointed via a ball joint (6). A first slanted plate (3) and a second slanted plate (4) are arranged on the working surfaces of the first pressure plate assembly (31) and the second pressure plate assembly (41), respectively. The drive shaft (2) passes through the housing (1) and the first slanted plate (3), the first pressure plate assembly (31), the second slanted plate (4), the second pressure plate assembly (41) and the ball joint (6) between the two groups of pressure plate assemblies inside the housing (1). The first slanted plate (3) and the second slanted plate (4) are driven by the drive shaft (2). A plurality of plunger assemblies (5) are arranged between the first slanted plate (3) and the second slanted plate (4), and one of the first slanted plate (3) and the second slanted plate (4) serves as an oil distribution plate.

2. A through-axis bevel gear synchronous swash plate piston pump as claimed in claim 1, characterized in that: The housing (1) is fixedly mounted on the synchronous gear ring (7). The housing (1) comprises a left half housing (101) and a right half housing (102). The annular end surfaces on both sides of the synchronous gear ring (7) are provided with teeth. The right side of the first bevel gear disc (311) and the left side of the second bevel gear disc (411) are provided with teeth that match the teeth on both sides of the synchronous gear ring (7), forming a bevel gear train to constrain the freedom of the first pressure plate assembly (31) and the second pressure plate assembly (41). A fixing flange (71) is provided on the periphery of the synchronous gear ring (7). The fixing flange (71) is fixed to the buckling position of the left half housing (101) and the right half housing (102) during installation. Sealing rings are provided on both sides of the fixing flange (71) and fixedly connected to the housing (1) by bolts.

3. A through-axis bevel gear synchronous swash plate piston pump as claimed in claim 1, characterized in that: The housing (1) is fixedly mounted on the synchronous gear ring (7). The housing (1) comprises a left half housing (101) and a right half housing (102). The synchronous gear ring (7) is divided into a left half gear ring and a right half gear ring along an axis. The left half gear ring is integrally formed with the left half housing (101), and the right half gear ring is integrally formed with the right half housing (102). The annular end faces of the left half gear ring and the right half gear ring in contact are flush with the engagement portion of the housing (1). When the housing (1) is engaged, the left half gear ring and the right half gear ring are tightly fitted. A sealing ring is provided at the engagement portion. The non-contact annular end faces of the left half gear ring and the right half gear ring are both provided with lateral teeth. The right side of the first bevel gear disc (311) and the left side of the second bevel gear disc (411) are both provided with teeth that match the teeth on both sides of the synchronous gear ring (7), forming a bevel gear train to constrain the degrees of freedom of the first pressure plate assembly (31) and the second pressure plate assembly (41).

4. A through-axis bevel gear synchronous swash plate piston pump as claimed in claim 1, characterized in that: The housing (1) is fixedly mounted on the synchronous gear ring (7); the housing (1) is further provided with an end cover (103); and a sealing ring is provided at the buckling position of the end cover (103).

5. A through-axis bevel gear synchronous swash plate piston pump according to any one of claims 2 to 4, characterized in that: A plurality of countersunk holes (12) are arranged on the left and right sides of the housing (1); the first swash plate (3) is fixed to the drive shaft (2) by means of a key connection; the first swash plate (3) is arranged in the countersunk hole on the rightmost side of the left side of the housing (1); a bearing is sleeved in the countersunk hole; the first swash plate (3) can rotate under the drive of the drive shaft (2); an inclined working surface is arranged on the right side of the first swash plate (3); a first pressure plate assembly (31) is arranged on the inclined working surface; the first swash plate (3) is kinematically connected to the pressure plate assembly (31); the second swash plate (4) is fixed and penetrated on the drive shaft (2) by means of a key connection; the second swash plate (4) is arranged in the countersunk hole on the leftmost side of the right side of the housing (1); a bearing is sleeved in the countersunk hole; the second swash plate (4) can rotate under the drive of the drive shaft (2); an inclined working surface is arranged on the left side of the second swash plate (4); a second pressure plate assembly (41) is arranged on the inclined working surface; the second swash plate (4) is kinematically connected to the pressure plate assembly (41).

6. A through-axis bevel gear synchronous swash plate piston pump as claimed in claim 5, characterized in that: The first pressure plate assembly (31) comprises a first bevel gear plate (311) and a first pressure plate (312), a plurality of ball seats being correspondingly arranged on the mounting surface of the first bevel gear plate (311), and a plurality of circular holes being arranged on the first pressure plate (312) corresponding to the ball seats on the first bevel gear plate (311); the second pressure plate assembly (41) comprises a second bevel gear plate (411) and a second pressure plate (412), a plurality of ball seats being correspondingly arranged on the mounting surface of the second bevel gear plate (411), and a plurality of circular holes being arranged on the second pressure plate (412) corresponding to the ball seats on the second bevel gear plate (411).

7. A through-axis bevel gear synchronous swash plate piston pump as claimed in claim 6, characterized in that: The first pressure plate (312) and the second pressure plate (412) are both provided with an annular platform with an inner spherical groove, the annular platform on the first pressure plate (312) and the annular platform on the second pressure plate (412) are arranged opposite to each other, and the ball joint (6) is arranged in the inner spherical grooves of the annular platforms arranged opposite to each other on the first pressure plate (312) and the second pressure plate (412).

8. A through-axis bevel gear synchronous swash plate piston pump as claimed in claim 7, characterized in that: The plunger assembly (5) comprises a corresponding plunger (51) and a plunger barrel (52); the ball head at the end of the plunger (51) is arranged in a ball seat between a first bevel gear disc (311) and a first pressure disc (312); the ball head at the end of the plunger barrel (52) is arranged in a ball seat between a second bevel gear disc (411) and a second pressure disc (412); the plunger (51) and the plunger barrel (52) are butt-jointed in a cylindrical pair connection manner.

9. A through-axis bevel gear synchronous swash plate piston pump as claimed in claim 8, characterized in that: An oil inlet hole (8) and an oil outlet hole (9) are provided in the housing (1), and the oil inlet hole (8) and the oil outlet hole (9) correspond to an oil inlet passage (42) and an oil outlet passage (43) on the first swash plate (3) or the second swash plate (4).

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