A low pulsation axial piston pump with unidirectional output and adjustable flow from zero

Abstract

A low-pulsation axial piston pump with unidirectional output and adjustable flow from zero, comprising a driving mechanism, a flow control mechanism, a cylinder mechanism and a valve-type distribution plate mechanism, wherein the driving shaft drives a rotating swash plate seat to rotate, the rotating swash plate seat drives the swash plate to rotate around the axis of the driving shaft, the swash plate drives a first swash plate adjusting rod to rotate around the axis of the driving shaft, the first swash plate adjusting rod drives a second swash plate adjusting rod to rotate around the axis of the driving shaft, the second swash plate adjusting rod drives a flow control inner ring to rotate, the flow adjustment screw cooperates with the flow control outer ring through a threaded structure, the plunger is installed in the cylinder body, the valve-type distribution plate is installed on the right housing, the one-way valve core is installed in the oil inlet hole and the oil discharge hole of the valve-type distribution plate, each guide groove on the cylinder body corresponds to an oil inlet hole and an oil discharge hole, the left housing and the right housing are installed on the housing, rotating the flow adjustment screw can adjust the plunger pump so that its output can be continuously adjusted from zero, and the pulsation of the plunger pump can be effectively reduced through the valve-type distribution plate mechanism.

Description

Technical Field

[0001] The invention relates to a plunger pump, in particular to a low-pulsation axial plunger pump with unidirectional output and adjustable flow from zero. Background Art

[0002] The plunger pump is a typical positive displacement hydraulic machine, driven by a prime mover. It converts the input mechanical energy into the pressure energy of the liquid, and then inputs it into the system in the form of pressure and flow. It is the power source of the hydraulic system. Since it can transport liquid under high pressure, it is widely used in various industries in industrial production and daily life.

[0003] However, the flow regulation of the existing axial variable piston pump cannot be adjusted from zero, and the output flow has a certain pulsation and is not impact-resistant, which undoubtedly makes the hydraulic system valves numerous and the working performance unstable. The existing technology has not proposed a good solution to the above problems, and there is no literature on how to solve the problem that the output flow of the axial piston pump cannot be adjusted from zero. Summary of the invention

[0004] The purpose of the present invention is to address the problems in the above-mentioned prior art and provide a low-pulsation axial piston pump with unidirectional output and adjustable flow from zero, and resistant to hydraulic shock. The piston pump has a simple structure, withstands liquid pressure through a piston mechanism, a variable mechanism controls the change of the inclination angle of the inclined plate, and a valve-type distribution plate controls the input and output of the hydraulic oil.

[0005] In order to achieve the above-mentioned purpose, the present invention includes a driving mechanism, a flow control mechanism, a cylinder mechanism and a valve-type distribution plate mechanism. The driving mechanism includes a rotating swash plate seat arranged in a left housing and limited by a tapered roller bearing and a cylindrical roller bearing. The driving shaft drives the rotating swash plate seat to rotate through a spline. The rotating swash plate seat drives the swash plate installed thereon to rotate around the axis of the driving shaft. The swash plate drives the first swash plate adjustment rod installed thereon to rotate around the axis of the driving shaft. The first swash plate adjustment rod drives the second swash plate adjustment rod installed on the rotating swash plate seat and hinged with it through a cylindrical pin to rotate around the axis of the driving shaft. The flow control mechanism includes a flow control outer ring that slides with the housing, a large deep groove ball bearing arranged in the flow control outer ring and limited by an outer ring clamping nut, and a flow control inner ring installed on the large deep groove ball bearing and limited by an inner ring clamping nut, and a flow adjustment screw arranged in the housing and limited by a thrust bearing. The cam body is connected with the cam shaft through the cam frame, and the cam frame is connected with the cam shaft through the cam frame.

[0006] As a further preference, the drive shaft has a spline that cooperates with the rotating swash plate seat, the drive shaft has a step for limiting the bearing, and the drive shaft has a shaft retaining ring installation groove for installing a shaft elastic retaining ring.

[0007] As a further preferred embodiment, the rotating swash plate seat has a second swash plate adjusting rod mounting groove for mounting a second swash plate adjusting rod, the rotating swash plate seat has a semicircular groove for mounting a swash plate, the rotating swash plate seat has a waist-shaped cavity, and the rotating swash plate seat has a spline hole for cooperating with the spline of the drive shaft.

[0008] As a further preferred embodiment, the swash plate has a swash plate semicircle cooperating with the rotating swash plate seat, the swash plate has a first swash plate adjusting rod mounting groove for mounting a first swash plate adjusting rod, and the swash plate has a swash plate end face cooperating with the sliding shoe.

[0009] As further preferred, the first swash plate adjusting rod is provided with a first connecting ear matched with the second swash plate adjusting rod, and the first connecting ear is provided with a first pin hole for installing a cylindrical pin.

[0010] As a further preferred embodiment, one end of the second swash plate adjusting rod has a Y-shaped connector that cooperates with the first connecting ear of the first swash plate adjusting rod, the other end of the second swash plate adjusting rod has a second connecting ear for cooperating with the flow control inner ring, the second connecting ear of the second swash plate adjusting rod has a second pin hole, and the Y-shaped connector of the second swash plate adjusting rod has a third pin hole.

[0011] As a further preferred embodiment, the flow control outer ring has a limit head for cooperating with the shell, the limit head of the flow control outer ring has a driving threaded through hole for cooperating with the flow adjusting screw, the flow control outer ring has an inner step for limiting the movement of the bearing, the flow control outer ring has an inner thread for installing the outer ring clamping nut, and the flow control outer ring has an outer ring stopping groove for cooperating with the outer ring clamping nut stopping washer.

[0012] As a further preferred embodiment, the flow control inner ring has a U-shaped connector that cooperates with the second connecting ear of the second swash plate adjusting rod, the U-shaped connector has a fourth pin hole for installing a cylindrical pin, the flow control inner ring has an outer step for limiting the movement of the bearing, the variable adjustment inner sleeve has an outer thread for installing an inner ring clamping nut, and the variable adjustment inner sleeve has an inner ring stopping groove for cooperating with the inner ring clamping nut stopping washer.

[0013] As a further preferred embodiment, the cylinder body is provided with a plunger hole for installing the plunger, the plunger holes are radially evenly distributed around the central axis of the cylinder body, one end of the plunger hole is provided with a guide groove connected thereto, the guide grooves are radially evenly distributed around the central axis of the cylinder body and correspond one-to-one to the plunger hole, the guide groove is provided with a first limit step for limiting the rebound stroke of the one-way valve core, the cylinder body end face on one side of the guide groove is matched with an end face of the valve type distribution plate, the cylinder body is provided with a jacket mounting hole for installing the return spring jacket, the cylinder body is provided with a step hole for installing the hexagon socket head screw, the step holes are radially evenly distributed around the central axis of the cylinder body but are staggered with the middle span of the guide groove.

[0014] As a further preferred embodiment, the return spring outer sleeve has an outer sleeve cavity for mounting the return spring and the return spring inner sleeve.

[0015] As a further preferred embodiment, the return spring inner sleeve is provided with an inner sleeve ball socket for cooperating with the central steel ball, and the return spring inner sleeve is provided with a protrusion for cooperating with the return spring.

[0016] As a further preferred embodiment, the return plate is provided with a return plate ball socket for cooperating with the central steel ball, the return plate is provided with a slipper limiting hole for limiting the slipper, and the slipper limiting hole corresponds one-to-one with the plunger hole of the cylinder body.

[0017] As a further preference, the plunger is provided with a ball head for cooperating with a sliding shoe.

[0018] As a further preference, the sliding shoe has a sliding shoe ball socket for cooperating with the ball head of the plunger, the sliding shoe has a bottom surface for cooperating with the end surface of the inclined plate, and the sliding shoe has a step surface for cooperating with the return plate.

[0019] As a further preferred embodiment, the valve-type distribution disk has an oil inlet hole and an oil drain hole for installing a one-way valve core, the oil inlet hole and the oil drain hole are composed of two cylindrical sections with different diameters and an inner conical surface connecting the two cylindrical sections, the position of the oil inlet hole corresponds one-to-one to the guide groove on the end face of the cylinder body and is evenly distributed with the same radius around the center axis of the valve-type distribution disk, the position of the oil drain hole corresponds one-to-one to the guide groove on the end face of the cylinder body and is evenly distributed with the same radius around the center axis of the valve-type distribution disk, each guide groove on the cylinder body corresponds to an oil inlet hole and an oil drain hole, the uniformly distributed radius of the oil inlet holes around the center axis of the valve-type distribution disk is larger than the uniformly distributed radius of the oil drain holes around the center axis of the valve-type distribution disk, the cylindrical section with a larger diameter of the oil inlet hole is on the same end face of the valve-type distribution disk, and the cylindrical section with a larger diameter of the oil drain hole is on the other end face of the valve-type distribution disk, and the valve-type distribution disk has a circular through hole for passing through the hexagonal cylindrical head screw, and the position of the circular through hole corresponds one-to-one to the position of the step hole of the cylinder body.

[0020] As a further preferred embodiment, the one-way valve core has an outer conical surface for cooperating with the inner conical surfaces of the oil inlet hole and the oil drain hole on the valve type distribution plate, the small end surface of the conical side of the one-way valve core corresponds to the cylindrical section with a smaller diameter of the oil inlet hole and the oil drain hole, the outer diameter of the one-way valve core corresponds to the cylindrical section with a larger diameter of the oil inlet hole and the oil drain hole, the outer wall of the one-way valve core has a groove for allowing fluid to pass through, and the one-way valve core has a guide hole for connecting with the groove.

[0021] As a further preference, the flow regulating screw has a driving thread at one end for cooperating with the driving threaded through hole of the flow control outer ring limit head, a fifth pin hole for connecting to the handle at the other end, and a shoulder in the middle for cooperating with the thrust ball bearing.

[0022] As a further preferred embodiment, the right housing has a first screw mounting hole for installing a flow regulating screw, an inner ring groove for sealing ring mounting is provided in the hole, an inner guide ring groove and an outer guide ring groove matching the positions of the oil inlet and oil discharge holes of the valve type distribution disk are provided on the end face of the boss of the right housing that cooperates with the valve type distribution disk, wherein the inner guide ring groove has a second limiting step for limiting the rebound stroke of the one-way valve core, an oil discharge port connected to the inner guide ring groove is provided on the right housing, an oil inlet connected to the outer guide ring groove is provided on the right housing, an installation step for cooperating with the housing is provided on the right housing, a sealing ring mounting outer ring groove for installing a sealing ring is provided on the side face of the step, a threaded blind hole matching the hexagon socket bolt used for installing the cylinder body and the valve type distribution disk is provided on the right housing, the position of the threaded blind hole corresponds one-to-one to the position of the step hole of the cylinder body, and a screw through hole for installing the right housing is provided on the right housing.

[0023] As a further preferred embodiment, the shell is provided with a bearing mounting hole for installing a thrust ball bearing, the bottom of the bearing mounting hole is provided with a second screw mounting hole for installing a flow regulating screw, the shell has a U-shaped groove for cooperating with a limit head of a flow control outer ring, the shell has a circular inner cavity for installing the flow control outer ring, and the shell has a hole retaining ring mounting groove for installing a hole elastic retaining ring.

[0024] As a further preferred embodiment, the left housing has a stepped through hole for installing bearing components, the left housing has a left housing installation step for cooperating with the housing, the side wall of the step surface has a left housing sealing ring installation outer ring groove for installing a sealing ring, the left housing has a left housing step hole for installing a hexagon socket head screw, and the left housing has a threaded through hole for connecting to the outside world.

[0025] As a further preferred embodiment, the pressure cover is installed on the left housing, the outer sleeve and the inner sleeve of the tapered roller bearing are respectively matched with different parts of the inner wall of the stepped through hole of the left housing, the left housing is matched with the housing through the left housing mounting step and fixed with a hexagon socket head screw, the cylindrical roller bearing without an inner ring is matched with part of the inner wall of the circular cavity of the housing, and the lateral displacement of the cylindrical roller bearing without an inner ring is limited by an elastic retaining ring of the hole and the left housing, part of the outer surface of the rotating swash plate seat cooperates with the roller of the cylindrical roller bearing without an inner ring to rotate, the swash plate is installed in the semicircular groove of the rotating swash plate seat through its own swash plate semicircle, the first swash plate adjusting rod is installed in the first swash plate adjusting rod mounting groove on the swash plate, and the second swash plate adjusting rod is installed in the The second swash plate adjusting rod mounting groove is mounted on the rotating swash plate seat, the outer wall of the flow control outer ring cooperates with the inner wall of the partial circular cavity of the housing, the limit head of the flow control outer ring cooperates with the U-shaped groove of the housing, the deep groove ball bearing is mounted in the inner cavity of the flow control outer ring, the outer ring clamping nut and the outer ring clamping nut stop washer are mounted at the inner thread of the flow control outer ring, the outer ring of the deep groove ball bearing is clamped by the inner step of the flow control outer ring and the outer ring clamping nut and the outer ring clamping nut stop washer, the flow control inner ring is mounted on the inner ring of the deep groove ball bearing, the inner ring clamping nut and the inner ring clamping nut stop washer are mounted on the outer thread of the flow control inner ring, the inner ring clamping nut and the inner ring clamping nut stop washer and the outer step of the flow control inner ring clamp the inner ring of the deep groove ball bearing, The Y-type joint of the second swash plate adjusting rod is connected to the first connecting ear of the first swash plate adjusting rod through a cylindrical pin, and the second connecting ear of the second swash plate adjusting rod is connected to the U-type connector of the flow control inner ring through a cylindrical pin. The thrust ball bearing is installed in the bearing mounting hole of the housing, and the shoulder of the flow regulating screw is installed between the two thrust ball bearings. The driving thread of the flow regulating screw cooperates with the driving thread through hole on the limit head of the flow control outer ring. The cylinder body and the valve type distribution plate are installed on the boss end face of the right housing through the hexagon socket cylindrical head screw, and the plunger is installed in the plunger hole on the cylinder body. The ball head of the plunger cooperates with the ball socket of the sliding shoe, and the bottom surface of the sliding shoe cooperates with the swash plate end face of the swash plate. The return spring jacket is installed in the jacket mounting hole of the cylinder body. The return spring is installed at In the outer sleeve cavity of the return spring outer sleeve, the return spring inner sleeve is installed in the outer sleeve cavity of the return spring outer sleeve, the inner sleeve ball socket of the return spring inner sleeve cooperates with the central steel ball, the protrusion of the return spring inner sleeve cooperates with the return spring, one end face of the return disk cooperates with the step surface of the sliding shoe, the return disk ball socket of the return disk cooperates with the central steel ball, the one-way valve core is installed in the oil inlet hole and the oil drain hole of the valve type distribution disk, the outer cone surface of the one-way valve core cooperates with the inner cone surface of the oil inlet hole and the oil drain hole, the valve core spring is installed in the guide hole of the one-way valve core, the protrusion end face on the right housing that cooperates with the valve type distribution disk is provided with an inner guide ring groove and an outer guide ring groove for circulating hydraulic oil, all the oil inlet holes of the valve type distribution disk are connected to the outer guide ring groove, and all the oil drain holes of the valve type distribution disk are connected to the inner guide ring groove.The inner guide ring groove of the right housing is connected to the oil discharge port of the right housing, the outer guide ring groove of the right housing is connected to the oil inlet of the right housing, the right housing mounting step of the right housing matches the housing, and the right housing is fixed to the housing by a large hexagon socket head screw.

[0026] In general, the above technical scheme conceived by the present invention has the following beneficial effects compared with the prior art: the cylinder body of the present invention does not rotate during operation, and the suction and discharge of the hydraulic oil are controlled by the valve-type distribution plate, so that the pulsation of the output hydraulic oil is very small, and the use of the valve-type distribution plate enables the present invention to withstand a certain hydraulic shock, and the inclination angle of the inclined plate of the present invention can be continuously adjusted from zero to a maximum angle, so the flow rate of the output hydraulic oil can be continuously adjusted from zero to a maximum flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the general assembly of the present invention.

[0028] Figure 2 A half-section schematic diagram of the present invention in a maximum output state.

[0029] Figure 3 A half-section schematic diagram of the present invention in a zero output state.

[0030] Figure 4 yes Figure 3 AA section view.

[0031] Figure 5 yes Figure 3 BB step cross-sectional view;

[0032] Figure 6 yes Figure 2 Schematic diagram of the E-direction structure;

[0033] Figure 7 yes Figure 2 Schematic diagram of the F-direction structure;

[0034] Figure 8 A schematic structural diagram of a drive shaft of the present invention;

[0035] Fig. 9 (a) and (b) are schematic diagrams of the structure of the swash plate seat of the present invention;

[0036] Fig.10 (a) and (b) are schematic diagrams of the structure of the swash plate of the present invention;

[0037] Fig.11 (a) and (b) are schematic structural diagrams of the first swash plate adjusting rod and the second swash plate adjusting rod of the present invention, respectively;

[0038] Fig.12(a) and (b) are schematic diagrams of the structure of the flow control outer ring and the flow control inner ring of the present invention respectively;

[0039] Fig.13 (a) and (b) are schematic diagrams of the structure of the cylinder body of the present invention;

[0040] Fig.14 (a) and (b) are schematic structural diagrams of the return spring outer sleeve and the return spring inner sleeve of the present invention respectively;

[0041] Fig.15 (a) and (b) are schematic diagrams of the structures of the return disc and the plunger of the present invention, respectively;

[0042] Fig.16 (a) and (b) are schematic diagrams of the structure of the sliding shoe of the present invention;

[0043] Fig.17 A schematic structural diagram of a valve type distribution plate of the present invention;

[0044] Fig.18 A schematic structural diagram of a valve type distribution plate of the present invention;

[0045] Fig.19 (a) and (b) are schematic diagrams of the structure of the one-way valve core of the present invention;

[0046] Fig. 20 A schematic structural diagram of a flow regulating screw of the present invention;

[0047] Fig.21 A schematic structural diagram of the right housing of the present invention;

[0048] Fig. 22 A schematic structural diagram of the right housing of the present invention;

[0049] Fig.23 A schematic structural diagram of a housing of the present invention;

[0050] Fig.24 A schematic structural diagram of a housing of the present invention;

[0051] Fig.25 A schematic structural diagram of the left housing of the present invention;

[0052] Fig.26 A schematic structural diagram of the left housing of the present invention;

[0053] In the attached figure: 1. Drive shaft, 2. Gland, 3. J-type boneless rubber oil seal, 4. Medium O-ring, 5. Small hexagon socket head screw, 6. Deep groove ball bearing, 7. Shaft elastic ring, 8. Tapered roller bearing, 9. Rotating swash plate seat, 10. Left housing, 11. Cylindrical pin, 12. First swash plate adjustment rod, 13. Large O-ring, 14. Cylindrical roller bearing, 15. Second swash plate adjustment rod, 16. Elastic ring for hole, 17. Housing, 18. Flow control outer ring, 19. Outer ring clamping nut, 20. Outer ring clamping nut stop washer, 21. Large deep groove ball bearing, 22. Inner ring clamping nut stop washer, 23. Thrust ball bearing, 24. Small O-ring, 25. Flow adjustment screw, 26. Embossed handle, 27. Medium hexagon socket head screw, 28. Inner ring compression nut, 29. Flow control inner ring, 30. Valve type distribution plate, 31. Cylinder, 32. Check valve core, 33. Valve core spring, 34. Right housing, 35. Large hexagon socket head screw, 36. Plunger, 37. Return spring jacket, 38. Return spring, 39. Return spring inner sleeve, 40. Slipper, 41. Return plate, 42. Center steel ball, 43. Swash plate, 44. Spline, 45. Step, 46. Shaft retaining ring mounting groove, 47. Second swash plate adjustment rod mounting groove, 48. Semicircular groove, 49. Waist-shaped cavity, 50. Spline hole, 51. Swash plate semicircle, 52. First swash plate adjustment rod mounting groove, 53. Swash plate end face, 54. First connection Ear, 55. First pin hole, 56. Y-type connector, 57. Second connecting ear, 58. Second pin hole, 59. Third pin hole, 60. Limiting head, 61. Driving threaded through hole, 62. Inner step, 63. Inner thread, 64. Outer ring retaining groove, 65. U-type connector, 66. Fourth pin hole, 67. Outer step, 68. Outer thread, 69. Inner ring retaining groove, 70. Plunger hole, 71. Guide groove, 72. First limiting step, 73. Cylinder end face, 74. Jacket mounting hole, 75. Step hole, 76. Jacket cavity, 77. Inner sleeve ball socket, 78. Protruding head, 79. Return plate ball socket, 80. Slipper limiting hole, 81. Ball head, 82. Slipper ball socket, 83. Bottom surface, 84. Step surface, 85. Oil inlet hole, 86. Oil drain hole, 87. Inner cone, 88. Circular through hole, 89. Outer cone, 90. Small end face, 91. Slot, 92. Guide hole, 93. Driving thread, 94. Fifth pin hole, 95. Shoulder, 96. First screw mounting hole, 97. Inner ring groove for sealing ring installation, 98. Boss end face, 99. Inner guide ring groove, 100. Outer guide ring groove, 101. Second limiting step, 102. Oil drain port, 103. Oil inlet, 104. Mounting step, 105. Outer ring groove for sealing ring installation, 106. Threaded blind hole, 107. Screw through hole, 108. Bearing mounting hole, 109. Second screw mounting hole, 110. U-shaped groove, 111. Circular inner cavity, 112. Hole retaining ring mounting groove, 113. Step through hole, 114.Left housing installation step, 115. Left housing seal ring installation outer ring groove, 116. Left housing step hole, 117. Threaded through hole. DETAILED DESCRIPTION

[0054] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0055] See also Figure 1-26 The present invention includes a driving mechanism, a flow control mechanism, a cylinder mechanism and a valve type distribution plate mechanism.

[0056] The driving mechanism includes a driving shaft 1, a gland 2, a left housing 10, a rotating swash plate seat 9, a swash plate 43, a first swash plate adjusting rod 12, a second swash plate adjusting rod 15, a cylindrical pin 11, a J-type boneless rubber oil seal 3, a medium-sized O-ring 4, a small-sized hexagon socket head screw 5, a small-sized deep groove ball bearing 6, a shaft elastic retaining ring 7, a tapered roller bearing 8, a cylindrical roller bearing without an inner circle 14, a hole elastic retaining ring 16, a large-sized O-ring 13, and a large-sized hexagon socket head screw 35. The deep groove ball bearing 6 and the tapered roller bearing 8 are installed in the stepped through hole 113 of the left housing 10. The left housing 10 has a left housing for connecting with the housing 17. The left housing installation step 114 is provided with a left housing sealing ring installation outer ring groove 115 for installing a large O-type sealing ring 13 on the outer wall of the left housing installation step 114. The left housing 10 is provided with a left housing step hole 116 for installing a large hexagon socket head screw 35. The left housing 10 is provided with a threaded through hole 117 for external connection. The drive shaft 1 is installed on the inner ring of the deep groove ball bearing 6, and is limited by the step 45 thereon and the shaft elastic retaining ring 7 installed on the shaft retaining ring installation groove 46 thereof. The rotating swash plate seat 9 is installed on the inner ring of the tapered roller bearing 8. The rotating swash plate seat 9 is provided with a waist-shaped cavity 49. The drive shaft 1 is connected to the rotating swash plate through its spline 44. The spline hole 50 of the disk seat 9 is connected to and drives the rotating swash plate seat 9 to rotate. Part of the outer cylindrical surface of the rotating swash plate seat 9 cooperates with the tapered roller bearing 8 and the cylindrical roller bearing 14 without an inner circle. The semicircular groove 48 of the rotating swash plate seat 9 cooperates with the swash plate 43 through the swash plate semicircle 51 and drives the swash plate 43 to rotate. The first swash plate adjusting rod 12 is installed in the first swash plate adjusting rod installation groove 52 on the swash plate 43. The first swash plate adjusting rod 12 can slide in the first swash plate adjusting rod installation groove 52 on the swash plate 43. The second swash plate adjusting rod 15 is installed in the second swash plate adjusting rod installation groove 47 on the rotating swash plate seat 9. The second swash plate adjusting rod 15 can be installed in the rotating The second slant plate adjusting rod on the slant plate seat 9 slides in the second slant plate adjusting rod installation groove 47, the first slant plate adjusting rod 12 has a first connecting ear 54 for cooperating with the second slant plate adjusting rod 15, the first connecting ear 54 has a first pin hole 55 for installing the cylindrical pin 11, one end of the second slant plate adjusting rod 15 has a Y-type connector 56 cooperating with the first connecting ear 54 of the first slant plate adjusting rod 12, the other end of the second slant plate adjusting rod 15 has a second connecting ear 57 for cooperating with the flow control inner ring 29, the second connecting ear 57 of the second slant plate adjusting rod 15 has a second pin hole 58, and the Y-type connector 56 of the second slant plate adjusting rod 15 has a third pin hole 59.The first swash plate adjusting rod 12 and the second swash plate adjusting rod 15 are hinged by the cylindrical pin 11. When the second swash plate adjusting rod 15 moves relative to the second swash plate adjusting rod mounting groove 47, the cylindrical pin 11 constrains the first swash plate adjusting rod 12 to move correspondingly relative to the first swash plate adjusting rod mounting groove 52, and the relative angle between the first swash plate adjusting rod 12 and the second swash plate adjusting rod 15 changes. The first swash plate adjusting rod 12 drives the inclination angle of the swash plate 43 to change. When the distance that the second swash plate adjusting rod 15 moves outward relative to its mounting groove reaches the maximum, the angle between the first swash plate adjusting rod 12 and the second swash plate adjusting rod 15 is 90°, and the inclination angle of the swash plate 43 is 0°. When the drive shaft 1 drives the rotating swash plate seat 9 to drive the swash plate 43 to rotate, the first swash plate adjusting rod 12 and the second swash plate adjusting rod 15 also rotate with the corresponding constraints.

[0057] The flow control mechanism includes a housing 17, a flow regulating screw 25, a flow control outer ring 18, a flow control inner ring 29, an outer ring clamping nut 19, an inner ring clamping nut 28, an outer ring clamping nut stop washer 20, an inner ring clamping nut stop washer 22, a large deep groove ball bearing 21, a thrust ball bearing 23, and an embossed handle 26. Part of the outer wall of the flow control outer ring 18 cooperates with part of the circular cavity 111 of the housing 17, and the limit head 60 of the flow control outer ring 18 cooperates with the U-shaped groove 110 of the housing 17. The flow control outer ring 18 can be in the circular cavity 111 of the housing 17 under the common constraints of the circular cavity 111 of the housing 17 and the U-shaped groove 110. 1, the flow regulating screw 25 is installed in the second screw mounting hole 109 of the housing 17, the driving thread 93 of the flow regulating screw 25 cooperates with the driving thread through hole 61 on the limit head 60 of the flow control outer ring 18, the shaft shoulder 95 of the flow regulating screw 25 cooperates with the thrust ball bearing 23 installed in the bearing mounting hole 108 of the housing 17, the flow regulating screw 25 can rotate under the constraint of the thrust ball bearing 23, the flow regulating screw 25 has a fifth pin hole 94 for cooperating with the embossed handle 26, the large deep groove ball bearing 21 is installed in the flow control outer ring 18, the outer ring clamping nut 19 is engaged with the inner thread 61 of the flow control outer ring 18 3, the flow control outer ring 18 has an outer ring retaining groove 64 for cooperating with the outer ring clamping nut stop washer 20, and after the outer ring clamping nut 19 is tightened, it and the inner step 62 of the flow control outer ring 18 jointly compress the outer ring clamping nut stop washer 20 and the outer ring of the large deep groove ball bearing 21 to limit the displacement of the outer ring of the large deep groove ball bearing 21 relative to the flow control outer ring 18, the flow control inner ring 29 is installed on the inner ring of the large deep groove ball bearing 21, the inner ring clamping nut 28 cooperates with the external thread 68 of the flow control inner ring 29, the flow control inner ring 29 has an inner ring retaining groove 69 for cooperating with the inner ring clamping nut stop washer 22, the inner ring clamping nut 2 After being tightened, 8 and the outer step 67 of the flow control inner ring 29 jointly compress the inner ring clamping nut, the locking washer 22 and the inner ring of the large deep groove ball bearing 21 to limit the relative displacement of the flow control inner ring 29 relative to the inner ring of the large deep groove ball bearing 21. The flow control inner ring 29 can rotate relative to the flow control outer ring 18 under the constraint of the large deep groove ball bearing 21. The U-shaped connector 65 of the flow control inner ring 29 is provided with a fourth pin hole for installing the cylindrical pin 11. The second swash plate adjusting rod 15 and the U-shaped connector 65 of the flow control inner ring 29 are hingedly connected by the cylindrical pin 11. The housing 17 is provided with a hole elastic retaining ring mounting groove 112 for installing the hole elastic retaining ring 16.

[0058] The cylinder mechanism includes a cylinder body 31, a plunger 36, a sliding shoe 40, a return spring sleeve 37, a return spring inner sleeve 39, a return spring 38, a center steel ball 42, a return disk 41, and a medium-sized hexagon socket head screw 27. The plunger 36 is installed in a plunger hole 70 on the cylinder body 31. The plunger holes 70 are evenly distributed on the cylinder body 31 around the central axis of the cylinder body 31. One end of the plunger hole 70 is provided with a guide groove 71. The guide groove 71 is provided with a first limit step 72 that limits the movement stroke of the one-way valve core 32. The cylinder body 31 is provided with a step hole 75 for installing the medium-sized hexagon socket head screw 27. The cylinder body end face 73 on the side of the guide groove 71 of the cylinder body 31 cooperates with an end face of the valve type distribution disk 30. The sliding shoe ball socket 82 of the sliding shoe 40 is hingedly installed with the ball head 81 of the plunger 36. The return spring 38 is installed in the outer sleeve mounting hole 74 on the cylinder body 31, and the return spring 38 is installed in the outer sleeve cavity 76 of the return spring outer sleeve 37. The return spring inner sleeve 39 is installed in the outer sleeve cavity 76 of the return spring outer sleeve 37. One end of the return spring 38 contacts the bottom surface of the inner cavity of the return spring outer sleeve 37, and the protrusion 78 of the return spring inner sleeve 39 contacts the other end of the return spring 38. The return spring 38 is in a compressed state after installation. The inner sleeve ball socket 77 of the return spring inner sleeve 39 cooperates with the center steel ball 42, and the return plate ball socket 79 of the return plate 41 cooperates with the center steel ball 42. The slipper 40 is installed in the slipper limiting hole 80 of the return plate 41, and one end surface of the return plate 41 cooperates with the step surface 84 of the slipper 40, and the bottom surface 83 of the slipper 40 cooperates with the swash plate end surface 53 of the swash plate 43.

[0059] The valve type distribution plate mechanism includes a valve type distribution plate 30, a one-way valve core 32, a right housing 34, a valve core spring 33, a small O-ring 24, a large hexagon socket head screw 35, and a large O-ring 13. The valve type distribution plate 30 has an oil inlet hole 85 and an oil outlet hole 86 for installing the one-way valve core 32. The oil inlet hole 85 and the oil outlet hole 86 are composed of two cylindrical sections with different diameters and an inner conical surface 87 connecting the two cylindrical surfaces. The position of the oil inlet hole 85 corresponds to the guide groove 71 on the cylinder end surface 73 and is evenly distributed with the same radius around the center axis of the valve type distribution plate 30. The position of the oil outlet hole 86 corresponds to the guide groove 71 on the cylinder end surface 73 and is evenly distributed with the same radius around the center axis of the valve type distribution plate 30. Each guide groove 71 corresponds to an oil inlet hole 85 and an oil drain hole 86, the uniform distribution radius of the oil inlet hole 85 around the center axis of the valve type distribution plate 30 is larger than the uniform distribution radius of the oil drain hole 86 around the center axis of the valve type distribution plate 30, the cylindrical section with a larger diameter of the oil inlet hole 85 is located on the same end surface of the valve type distribution plate 30, and the cylindrical section with a larger diameter of the oil drain hole 86 is located on the other end surface of the valve type distribution plate 30, the one-way valve core 32 is installed in the oil inlet hole 85 and the oil drain hole 86 of the valve type distribution plate 30, the outer conical surface 89 of the one-way valve core 32 cooperates with the inner conical surface 87 of the oil inlet hole 85 and the oil drain hole 86, and the small end surface 90 on the conical side of the one-way valve core 32 corresponds to the cylindrical section with a smaller diameter of the oil inlet hole 85 and the oil drain hole 86 The outer diameter of the one-way valve core 32 corresponds to the cylindrical section with a larger diameter of the oil inlet hole 85 and the oil discharge hole 86. The outer wall of the one-way valve core 32 has a groove 91 for allowing fluid to pass through. The right housing 34 has a first screw mounting hole 96 for mounting the flow regulating screw 25, and the hole is provided with an inner ring groove 97 for mounting a sealing ring. The end surface 98 of the protrusion of the right housing 34 that cooperates with the valve-type distribution plate 30 has an inner guide ring groove 99 and an outer guide ring groove 100 that match the positions of the oil inlet hole 85 and the oil discharge hole 86 of the valve-type distribution plate 30, wherein the inner guide ring groove 99 has a second limiting step 101 for limiting the rebound stroke of the one-way valve core 32, and the right housing 34 has an oil discharge port 102 that is connected to the inner guide ring groove 99. The body 34 is provided with an oil inlet 103 connected with the outer guide ring groove 100, the right housing 34 is provided with an installation step 104 for cooperating with the housing 17, and the side of the step is provided with a sealing ring installation outer ring groove 105 for installing a large O-ring 13, the right housing 34 is provided with a threaded blind hole 106 for installing the cylinder body 31 and the valve type distribution plate 30, the right housing 34 is provided with a screw through hole 107 for connecting with the housing 17, the valve core spring 33 is installed in the guide hole 92 of the one-way valve core 32, and the valve core spring 33 is in a compressed state after installation, and the valve core spring 33 can continue to be compressed at this time, and the valve type distribution plate 30 is provided with a circular through hole 88 for passing the medium-sized hexagon socket head screw 27.

[0060] The working principle of the present invention is that an external force drives the driving shaft 1 to rotate, and the driving shaft 1 drives the rotating swash plate seat 9 to rotate through the spline 44, and the rotating swash plate seat 9 drives the swash plate 43 and the first swash plate adjusting rod 12 and the second swash plate adjusting rod 15 to rotate, and the second swash plate adjusting rod 15 drives the flow control inner ring 29 to rotate, and the cylinder body 31 is fixed to the right housing 34 through the medium-sized hexagon socket head screw 27, and the plunger 36 is installed in the plunger hole 70 of the cylinder body 31, so the plunger 36 will not rotate with the rotation of the swash plate 43, and will only make reciprocating motion relative to the cylinder body 31 under the drive of the sliding shoe 40 hinged thereto, when the external force drives the embossed handle 26 to rotate, the embossed handle 26 drives the flow control screw 25 to rotate, and the driving thread 93 of the flow control screw 25 drives the flow control outer ring 1 8 moves, when the flow adjustment screw 25 drives the flow control outer ring 18 to move from the side away from the drive shaft 1 to the side close to the drive shaft 1, the flow control outer ring 18 drives the large deep groove ball bearing 21 installed therein to move from the side away from the drive shaft 1 to the side close to the drive shaft 1, the large deep groove ball bearing 21 drives the flow control inner ring 29 to move from the side away from the drive shaft 1 to the side close to the drive shaft 1, the flow control inner ring 29 drives the second swash plate adjusting rod 15 to move from the side away from the drive shaft 1 to the side close to the drive shaft 1, the second swash plate adjusting rod 15 drives the first swash plate adjusting rod 12 to swing, the first swash plate adjusting rod 12 drives the swash plate 43 to swing, when the flow control outer ring 18 starts to move from the position farthest from the drive shaft 1 to the position close to the drive shaft 1, the second swash plate adjusting rod 15 drives the first swash plate adjusting rod 12 to swing, and the first swash plate adjusting rod 12 drives the swash plate 43 to swing. The angle between the second swash plate adjusting rod 15 and the first swash plate adjusting rod 12 gradually decreases from 90°, and the inclination angle of the swash plate 43 also gradually increases from 0°. When the flow control outer ring 18 moves to the position closest to the drive shaft 1, the angle between the second swash plate adjusting rod 15 and the first swash plate adjusting rod 12 is the smallest, and the inclination angle of the swash plate 43 reaches the maximum. The return spring outer sleeve 37 supports the return spring 38, and the return spring 38 supports the return spring inner sleeve 39. The return spring 38 is in a compressed state when installed. The elastic force of the return spring 38 acts on the return spring inner sleeve 39, and the return spring inner sleeve 39 transmits the force to the center steel ball 42, and the center steel ball 42 transmits the force to the return plate 41, and the return plate 41 transmits the force to the sliding shoe 40, thereby pressing the sliding shoe 40 against the swash plate 43, the one-way valve core 32 is installed in the oil inlet hole 85 and the oil discharge hole 86 of the valve type distribution plate 30, and the valve core spring 33 is installed in the guide hole 92 of the one-way valve core 32. After the valve core spring 33 is installed, it is in a compressed state. At this time, the valve core spring 33 can continue to be compressed. The elastic force of the valve core spring 33 acts on the one-way valve core 32, so that the outer conical surface 89 of the one-way valve core 32 fits with the inner conical surface 87 of the oil inlet hole 85 and the oil discharge hole 86, thereby achieving the sealing requirement. When a pressure greater than the elastic force of the valve core spring 33 acts on the small end surface 90 of the one-way valve core 32, the one-way valve core 32 moves to the side of the valve core spring 33, and the outer conical surface 89 of the one-way valve core 32 is separated from the inner conical surface 87 of the oil inlet hole (85) and the oil discharge hole (86) on the valve type distribution plate 30.The two sides of the one-way valve core 32 are connected. When the pressure disappears, the valve core spring 33 pushes the one-way valve core 32 to reset. The outer conical surface 89 of the one-way valve core 32 contacts the inner conical surface 87 of the oil inlet hole (85) and the oil outlet hole (86) on the valve type distribution plate 30. The two sides of the one-way valve core 32 are separated. The inclined plate 43, the plurality of sliding shoes 40, the plurality of plungers 36, the cylinder body 31, the valve type distribution plate 30, and the plurality of one-way valve cores 32 together form a plurality of closed cavities. The valve type distribution plate 30 and the plurality of one-way valve cores 32 are connected to each other. The disc 30 and the one-way valve core 32 are separated and not connected to each other. When the plunger 36 moves out of the plunger hole 70 on the cylinder body 31, the volume of the closed cavity increases, generating negative pressure, prompting the one-way valve core 32 installed in the oil inlet hole 85 of the valve-type distribution disc 30 to open, and the hydraulic oil enters the outer guide ring groove 100 through the oil inlet port 103 on the right housing 34 and is then sucked into the closed cavity. When the plunger 36 moves into the plunger hole 70 on the cylinder body 31, the volume of the cavity decreases, generating The positive pressure causes the one-way valve core 32 installed in the oil discharge hole 86 of the valve-type distribution plate 30 to open, and the hydraulic oil is pressed out of the closed cavity and then flows into the inner guide ring groove 99 on the right housing 34 to be discharged through the oil discharge port 102. The bottom surfaces 83 of all the sliding shoes 40 are tightly attached to the swash plate end surface 53 of the swash plate 43 under the action of the return plate 41. When the inclination angle of the swash plate 43 is not zero, all the plungers 36 make reciprocating motion relative to the cylinder body 31 as the swash plate 43 rotates continuously. When the plungers 36 gradually move from the farthest place from the drive shaft 1 to the closest place to the drive shaft 1 as the swash plate 43 rotates, the action of the plunger pump sucking oil is completed, and then the action of the plunger pump pressing oil is completed when the plunger 36 gradually moves from the closest place to the drive shaft 1 to the farthest place from the drive shaft 1. When the swash plate 43 rotates, all the plungers 36 are performing their own reciprocating motions accordingly, so the plunger pump can continuously repeat the movements of sucking and pressing oil, so that the plunger pump can continuously suck and press oil, thereby continuously working. ,

[0061] When the inclination angle of the swash plate 43 is 0°, the swash plate end face 53 on the swash plate 43 is parallel to the cylinder end face 73, and the distance between any point on the swash plate end face 53 and the cylinder end face 73 is equal. The surface formed by the swash plate end face 53 of the swash plate 43 when the swash plate 43 rotates is a plane, and the sliding shoe 40 is in close contact with the swash plate end face 53 of the swash plate 43. Therefore, when the swash plate 43 rotates, the plunger 36 hinged to the sliding shoe 40 has no displacement relative to the cylinder 31. At this time, the plunger pump is in a zero output state. When the inclination angle of the swash plate 43 is not 0°, the end face of the swash plate 43 is not parallel to the cylinder end face 73. The distance between any point on the swash plate end face 53 and the cylinder end face 73 changes with the inclination angle of the swash plate 43. The sliding shoe 40 is in close contact with the swash plate end face 53 of the swash plate 43. When the swash plate 43 rotates, the sliding shoe 40 and the plunger 36 hinged to the sliding shoe 40 make a reciprocating motion relative to the cylinder body 31. After the swash plate 43 rotates a certain angle, the plunger 36 will produce a corresponding displacement relative to the cylinder body 31. When the swash plate 43 rotates to cause the plunger 36 to move from the side close to the cylinder body 31 to the side away from the cylinder body 31, the plunger moves a corresponding distance from the cylinder body 31, and the cavity formed by the swash plate 43, the sliding shoe 40, the plunger 36, the cylinder body 31, the valve type distribution plate 30, and the one-way valve core 32 increases, thereby generating negative pressure, prompting the corresponding one-way valve core 32 installed in the oil inlet hole 85 of the valve type distribution plate 30 to open, so that the hydraulic oil enters the outer guide ring groove 100 through the oil inlet port 103 on the right housing 34 and is then sucked in. When the swash plate 43 rotates to cause the displacement of the plunger 36 from the side away from the cylinder body 31 to the side close to the cylinder body 31, the plunger 36 moves into the corresponding distance from the cylinder body 31, and the cavity formed by the swash plate 43, the sliding shoe 40, the plunger 36, the cylinder body 31, the valve-type distribution plate 30, and the one-way valve core 32 is reduced, thereby generating a positive pressure, prompting the corresponding one-way valve core 32 installed in the oil discharge hole 86 of the valve-type distribution plate 30 to open, so that the hydraulic oil is pressed out of the closed cavity and then flows into the inner guide ring groove 99 on the right housing 34 and is discharged through the oil discharge port 102, thereby converting mechanical energy into hydraulic energy. The multiple closed cavities formed by the plurality of closed cavities are not interconnected, so the cavities do not interfere with each other, so that when the plunger pump is working, each cavity completes its own oil suction or oil discharge action as the respective sliding shoes 40 move, so that the plunger pump works continuously. When the inclination angle of the swash plate 43 gradually increases from 0°, the distance between any point on the swash plate end surface 53 and the cylinder end surface 73 changes as the inclination angle of the swash plate 43 changes, so that when the swash plate 43 rotates, the distance difference between the farthest position and the closest position of the sliding shoe 40 from the cylinder end surface 73 increases as the inclination angle increases, and the stroke of the sliding shoe 40 driving the plunger 36 to move also increases accordingly. Therefore, the swash plate 43, the sliding shoe 40, the plunger 36, the cylinder 31, and the valve type distribution plate 30,The difference between the maximum volume and the minimum volume of the closed cavity formed by the one-way valve core 32 increases with the increase of the stroke of the plunger 36, so the output flow of the plunger pump increases with the increase of the inclination angle of the swash plate 43, and vice versa, the output flow of the plunger pump decreases with the decrease of the inclination angle of the swash plate 43. Since the inclination angle of the swash plate 43 can be continuously adjusted from 0° to the maximum angle and from the maximum angle to 0°, the flow of the plunger pump is fully adjustable from zero output to maximum flow output and from maximum flow output to zero output.

[0062] When the output end of the plunger pump encounters a hydraulic shock and the pressure at the output end is greater than or equal to the output pressure of the plunger pump, the one-way valve core 32 in the oil discharge hole 86 is reset under the push of the valve core spring 33, preventing the hydraulic shock from impacting the internal structure of the plunger pump and thus damaging the plunger pump.

Claims

1. A low-pulsation axial piston pump with unidirectional output and adjustable flow from zero, characterized in that: The invention comprises a driving mechanism, a flow control mechanism, a cylinder mechanism and a valve type distribution plate mechanism. The driving mechanism comprises a rotating swash plate seat (9) which is arranged in a left housing (10) and limited by a tapered roller bearing (8) and a cylindrical roller bearing (14). The driving shaft (1) drives the rotating swash plate seat (9) to rotate via a spline (44) thereon. The rotating swash plate seat (9) drives a swash plate (43) mounted thereon to rotate around the axis of the driving shaft (1). The swash plate (43) drives a first swash plate adjusting rod (12) mounted thereon to rotate around the axis of the driving shaft (1). The first swash plate adjusting rod (12) drives a second swash plate adjusting rod (15) mounted on the rotating swash plate seat (9) and hinged therewith via a cylindrical pin (11) to rotate around the axis of the driving shaft (1). The flow control mechanism The invention comprises a flow control outer ring (18) which is slidably matched with a housing (17), a large deep groove ball bearing (21) which is arranged in the flow control outer ring (18) and limited by an outer ring clamping nut (19), and a flow control inner ring (29) which is installed on the large deep groove ball bearing (21) and limited by an inner ring clamping nut (28), a flow regulating screw (25) which is arranged in the housing (17) and limited by a thrust bearing (23) and is matched with the flow control outer ring (18) through a threaded structure, a cylinder mechanism comprising a cylinder (31) and a plunger (36) which is installed in a plunger hole (70) on the cylinder (31), a ball head (81) of the plunger (36) being hinged to a slipper ball socket (82) of a slipper (40), and a return spring sleeve (37) which is installed on the cylinder (31). 1) The outer sleeve mounting hole (74) in the middle, the return spring (38) is placed in the outer sleeve cavity (76) of the return spring outer sleeve (37), the return spring inner sleeve (39) presses the return spring (38), the center steel ball (42) cooperates with the inner sleeve ball socket (77) of the return spring inner sleeve (39) and the return plate ball socket (79) of the return plate (41), and the return plate (41) presses the sliding shoe (40) under the action of the elastic force of the return spring (38) so that it is close to the slant plate end surface (53) of the slant plate (43), the valve type distribution plate mechanism includes a right housing (34) and a valve type distribution plate (30) matched therewith, the one-way valve core (32) is installed in the oil inlet hole (85) and the oil outlet hole (86) of the valve type distribution plate (30), and each of the cylinder body (31) and the cylinder body (31) is provided with a plurality of valves. A guide groove (71) corresponds to an oil inlet hole (85) and an oil discharge hole (86); a cylinder end surface (73) is closely attached to a valve type distribution plate (30); the cylinder (31) and the valve type distribution plate (30) are mounted on a right housing (34) by means of a medium-sized hexagon socket bolt (27); the left housing (10) and the right housing (34) are mounted on a housing (17); a second swash plate adjusting rod mounting groove (47) for mounting a second swash plate adjusting rod (15) is provided on the rotating swash plate seat (9); a semicircular groove (48) for mounting a swash plate (43) is provided on the rotating swash plate seat (9); a waist-shaped cavity (49) is provided on the rotating swash plate seat (9); and a spline hole (50) for matching with a spline (44) of a drive shaft (1) is provided on the rotating swash plate seat (9).The swash plate (43) has a swash plate semicircle (51) that matches the rotating swash plate seat (9), the swash plate (43) has a first swash plate adjusting rod mounting groove (52) for mounting a first swash plate adjusting rod (12), and the swash plate (43) has a swash plate end surface (53) that matches the sliding shoe (40).

2. The low-pulsation axial piston pump with unidirectional output and adjustable flow from zero according to claim 1, characterized in that: The flow control outer ring (18) has a limit head (60) for cooperating with the housing (17); the limit head (60) of the flow control outer ring (18) has a driving threaded through hole (61) for cooperating with the flow regulating screw (25); the flow control outer ring (18) has an inner step (62) for limiting the movement of the bearing; the flow control outer ring (18) has an inner thread (63) for installing the outer ring clamping nut; the flow control outer ring (18) has an outer ring retaining groove (64) for cooperating with the outer ring clamping nut retaining washer (20).

3. The low-pulsation axial piston pump with unidirectional output and adjustable flow from zero according to claim 1, characterized in that: The cylinder body (31) is provided with a plunger hole (70) for installing a plunger (36); the plunger holes (70) are evenly distributed radially around the central axis of the cylinder body (31); one end of the plunger hole (70) is provided with a guide groove (71) connected thereto; the guide grooves (71) are evenly distributed radially around the central axis of the cylinder body (31) and correspond one to one with the plunger holes (70); the guide grooves (71) are provided with a first limit step ( 72), a cylinder end face (73) on one side of the guide groove (71) on the cylinder body (31) cooperates with an end face of the valve type distribution plate (30), a jacket mounting hole (74) for mounting a return spring jacket (37) on the cylinder body (31), a stepped hole (75) for mounting a hexagon socket head screw on the cylinder body (31), and the stepped holes (75) are evenly distributed radially around the central axis of the cylinder body (31) but staggered with the middle of the guide groove (71).

4. The low-pulsation axial piston pump with unidirectional output and adjustable flow from zero according to claim 1, characterized in that: The valve type distribution plate (30) has an oil inlet hole (85) and an oil outlet hole (86) for installing a one-way valve core (32). The oil inlet hole (85) and the oil outlet hole (86) are composed of two cylindrical sections with different diameters and an inner cone (87) connecting the two cylindrical sections. The position of the oil inlet hole (85) corresponds to the guide groove (71) on the cylinder end surface (73) one by one and is evenly distributed with the same radius around the center axis of the valve type distribution plate (30). The position of the oil outlet hole (86) corresponds to the guide groove (71) on the cylinder end surface (73) one by one and is evenly distributed with the same radius around the center axis of the valve type distribution plate (30). Each guide groove (71) on the cylinder (31) Each of the oil inlet holes (85) and the oil outlet holes (86) corresponds to an oil inlet hole (85) and an oil outlet hole (86). The uniform distribution radius of the oil inlet holes (85) around the center axis of the valve type distribution plate (30) is larger than the uniform distribution radius of the oil outlet holes (86) around the center axis of the valve type distribution plate (30). The cylindrical section with a larger diameter of the oil inlet hole (85) is located on the same end surface of the valve type distribution plate (30), and the cylindrical section with a larger diameter of the oil outlet hole (86) is located on the other end surface of the valve type distribution plate (30). The valve type distribution plate (30) is provided with a circular through hole (88) for passing a hexagon socket head screw. The position of the circular through hole (88) corresponds one-to-one to the position of the step hole (75) on the cylinder body (31).

5. The low-pulsation axial piston pump with unidirectional output and adjustable flow from zero according to claim 1, characterized in that: The one-way valve core (32) has an outer conical surface (89) for cooperating with the inner conical surfaces (87) of the oil inlet hole (85) and the oil discharge hole (86) on the valve type distribution plate (30); the small end surface (90) on one side of the conical shape of the one-way valve core (32) corresponds to the cylindrical section with a smaller diameter of the oil inlet hole (85) and the oil discharge hole (86); the outer diameter of the one-way valve core (32) corresponds to the cylindrical section with a larger diameter of the oil inlet hole (85) and the oil discharge hole (86); the outer wall of the one-way valve core (32) has a groove (91) for allowing fluid to pass through; and the one-way valve core (32) has a guide hole (92) for communicating with the groove.

6. The low-pulsation axial piston pump with unidirectional output and adjustable flow from zero according to claim 1, characterized in that: The right housing (34) has a first screw mounting hole (96) for mounting a flow regulating screw (25), and an inner ring groove (97) for mounting a sealing ring is provided in the hole. An inner guide ring groove (99) and an outer guide ring groove (100) are provided on a boss end surface (98) of the right housing (34) that matches with the valve type distribution plate (30) and matches with the oil inlet hole (85) and the oil discharge hole (86) of the valve type distribution plate (30). The inner guide ring groove (99) has a second limiting step (101) for limiting the rebound stroke of the one-way valve core (32). The right housing (34) has an oil discharge port (102) that communicates with the inner guide ring groove (99). The right housing (34) is provided with an oil inlet (103) connected with the outer guide ring groove (100), the right housing (34) is provided with a mounting step (104) for matching with the housing (17), the side surface of the step is provided with a sealing ring mounting outer ring groove (105) for mounting a sealing ring, the right housing (34) is provided with a threaded blind hole (106) matched with a hexagon socket bolt used for mounting the cylinder body (31) and the valve type distribution plate (30), the position of the threaded blind hole (106) corresponds to the position of the step hole (75) of the cylinder body (31), and the right housing (34) is provided with a screw through hole (107) for mounting the right housing (34).

7. The low-pulsation axial piston pump with unidirectional output and adjustable flow from zero according to claim 1, characterized in that: The housing (17) is provided with a bearing mounting hole (108) for mounting a thrust ball bearing (23); the bottom of the bearing mounting hole (108) is provided with a second screw mounting hole (109) for mounting a flow regulating screw (25); the housing (17) is provided with a U-shaped groove (110) for cooperating with a limit head (60) of a flow control outer ring (18); the housing (17) is provided with a circular inner cavity (111) for mounting the flow control outer ring (18); and the housing (17) is provided with a hole retaining ring mounting groove (112) for mounting a hole elastic retaining ring (16).

8. The low-pulsation axial piston pump with unidirectional output and adjustable flow from zero according to claim 1, characterized in that: The left housing (10) has a stepped through hole (113) for mounting bearing parts, the left housing (10) has a left housing mounting step (114) for matching with the housing (17), the side wall of the step surface has a left housing sealing ring mounting outer ring groove (115) for mounting a sealing ring, the left housing (10) has a left housing step hole (116) for mounting a hexagon socket head screw, and the left housing (10) has a threaded through hole (117) for connecting with the outside.

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