Hydraulic pump and speed change system

Abstract

The invention discloses a hydraulic pump and a speed control system, and relates to the technical field of pumps. A plurality of plunger cavities arranged in the circumferential direction of the cylinder body are formed in the first end of the cylinder body, and the cylinder body is in transmission connection with the second driving part; the first end of the plunger is rotationally connected with the second end of the driving shaft, and the second end of the plunger is in sliding fit with the plunger cavity; when the hydraulic pump is in a working state, the second driving part can be started firstly, the second driving part drives the cylinder body to rotate in the direction close to or away from the driving shaft, the inclination angle of the cylinder body is changed, then the displacement of the hydraulic pump is changed, and the power of the hydraulic pump is adjusted; the included angle between the axis of the driving shaft and the cylinder body is 45 degrees, which means that the maximum inclination angle of the cylinder body is 45 degrees, and compared with a hydraulic pump in the prior art that the inclination angle cannot be adjusted or cannot reach 45 degrees, the output power of the hydraulic pump is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, and in particular to a hydraulic pump and a speed change system. Background Art

[0002] The output power of the hydraulic pump in the prior art is relatively small. Therefore, how to increase the output power of the hydraulic pump has become a technical problem that those skilled in the art need to solve urgently. Summary of the invention

[0003] The object of the present invention is to provide a hydraulic pump and a speed change system to improve the output power of the hydraulic pump.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a hydraulic pump, comprising:

[0006] A driving shaft and a first driving member, wherein the driving shaft is in transmission connection with the first driving member, and the first driving member is used to drive the driving shaft to rotate with the axis of the driving shaft as the rotating axis;

[0007] A cylinder body, wherein a first end of the cylinder body is provided with a plurality of plunger cavities along the circumference of the cylinder body, the plunger cavities extending along the axial direction of the cylinder body, a distribution plate is provided at the second end of the cylinder body, and the distribution plate is provided with an inlet and outlet communicating with the plunger cavities;

[0008] A second driving member, the second driving member is drivingly connected to the cylinder body, and the second driving member is used to drive the cylinder body to rotate in a direction close to and away from the driving shaft;

[0009] A plunger, wherein the first end of the plunger is rotatably connected to the second end of the driving shaft, and the second end of the plunger is slidably matched with the plunger cavity in the axial direction of the plunger cavity and is rotatably connected;

[0010] A transmission shaft, both ends of which are respectively connected to the driving shaft and the cylinder body, the driving shaft can drive the cylinder body to rotate through the transmission shaft, and the transmission shaft and the plunger are arranged to avoid each other;

[0011] a first stopper, the first stopper being located outside the transmission shaft and on the rotation track of the transmission shaft, and when the transmission shaft abuts against the first stopper, the angle between the axis of the driving shaft and the axis of the cylinder body is 45°;

[0012] A second limiter, the second limiter is arranged on a side of the driving shaft and / or the cylinder body away from the transmission shaft, the second limiter abuts against the transmission shaft, and the second limiter applies a first force to the transmission shaft, and the first force is arranged from the side away from the transmission shaft toward the side close to the transmission shaft;

[0013] A third limit member applies a second force to the second limit member, the direction of the second force is opposite to the direction in which the second limit member is separated from the driving shaft and / or the cylinder body, the second force is used to prevent the second limit member from being separated from the driving shaft and / or the cylinder body, and the third limit member and the second limit member are arranged to avoid the transmission shaft.

[0014] Preferably, the first end of the transmission shaft is located between the first ends of the plurality of plungers, and the second end of the transmission shaft is located between the second ends of the plurality of plungers;

[0015] Alternatively, the hydraulic pump includes a plurality of transmission shafts, wherein the transmission shafts are located outside the cylinder body and the driving shaft, and the transmission shafts are arranged to avoid the cylinder body and the driving shaft.

[0016] Preferably, a first transmission part is provided at the first end of the transmission shaft, and a second transmission part is provided at the second end of the transmission shaft, the first transmission part and the second end of the driving shaft are slidingly matched in the axial direction of the driving shaft, the first transmission part applies a third force to the transmission shaft, and the third force enables the driving shaft to drive the transmission shaft to rotate, the second transmission part and the first end of the cylinder body are slidingly matched in the axial direction of the cylinder body, and the second transmission part applies a fourth force to the transmission shaft, and the fourth force enables the transmission shaft to drive the cylinder body to rotate.

[0017] Preferably, the first transmission part comprises the driving shaft, and a plurality of movement rings arranged along the circumference of the transmission shaft, the movement rings are sleeved outside the first end of the transmission shaft, the movement rings and the driving shaft are slidably matched in the axial direction of the driving shaft, and the movement rings and the driving shaft are frictionally matched;

[0018] Alternatively, the first end of the transmission shaft and the driving shaft are slidably matched and frictionally matched on the axis of the driving shaft. In this case, the first transmission part includes the first end of the transmission shaft and the driving shaft.

[0019] Preferably, the first stopper comprises a rotation area provided at the second end of the driving shaft and / or the first end of the cylinder body, and the rotation area is arranged from close to the axis of the driving shaft and / or the cylinder body to away from the axis of the driving shaft and / or the cylinder body;

[0020] Alternatively, the first limiting member includes a limiting housing arranged outside the transmission shaft, and the limiting housing, the driving shaft, and the cylinder body are independently arranged.

[0021] Preferably, the second position-limiting member comprises a pre-tightening member and a pre-tightening seat, the pre-tightening member is located at a side of the pre-tightening seat away from the transmission shaft, the pre-tightening seat is slidably matched with the driving shaft or the cylinder body, the pre-tightening member applies a fifth force to the pre-tightening seat, and the fifth force is set from a direction away from the transmission shaft to a direction close to the transmission shaft;

[0022] Alternatively, the second limiting member includes a third driving member, and the third driving member applies a sixth force to the transmission shaft, and the sixth force is set from a direction away from the transmission shaft to a direction close to the transmission shaft.

[0023] Preferably, the third position-limiting member is arranged along the radial direction of the driving shaft, or is arranged obliquely with respect to the driving shaft; and / or, the third position-limiting member is arranged along the radial direction of the cylinder body, or is arranged obliquely with respect to the cylinder body;

[0024] And / or, a first force transmission member is provided between the transmission shaft and the second end of the driving shaft, and / or a second force transmission member is provided between the transmission shaft and the first end of the cylinder body;

[0025] The hydraulic pump further comprises a lubrication channel, an inlet of which is connected to an external lubrication medium source, and the transmission shaft and the driving shaft, the contact area of ​​the cylinder body, and the first limit member are all connected to the lubrication channel.

[0026] Preferably, the hydraulic pump includes a housing, the cylinder body and the driving shaft are both located in the housing, the housing is provided with a plurality of heat dissipation windows, the driving shaft is provided with a plurality of heat dissipation plates, the heat dissipation plates are provided with a plurality of heat dissipation hole groups connected to the heat dissipation windows, the heat dissipation hole groups include square holes, and guide plates arranged in the square holes, and the guide plates and the heat dissipation plates are arranged at an angle.

[0027] Preferably, a recovery channel and a lubrication hole are provided at one end of the distribution plate facing the cylinder body, and the recovery channel and the lubrication hole are arranged in sequence from the inside to the outside.

[0028] In addition, the present invention also discloses a speed change system, which includes the hydraulic pump.

[0029] Compared with the prior art, the present invention has achieved the following technical effects:

[0030] The present invention comprises a driving shaft transmission connection with a first driving member, the first driving member can drive the driving shaft to rotate with the axis of the driving shaft as the rotating shaft, the cylinder body is transmission-connected with the second driving member, the second driving member can drive the cylinder body to rotate in the direction away from and close to the driving shaft, the first end of the cylinder body is provided with a plurality of plunger cavities along the circumference of the cylinder body, the plunger cavity extends along the axial direction of the cylinder body, the second end of the cylinder body is provided with a distribution plate connected with the plunger cavity, the first end of the plunger is rotationally connected with the second end of the driving shaft, the second end of the plunger is rotationally connected with the plunger cavity and slidably matched in the axial direction of the plunger cavity, the two ends of the transmission shaft are transmission-connected with the driving shaft and the cylinder body respectively, the driving shaft can drive the cylinder body to rotate through the transmission shaft, the first limiter is located outside the transmission shaft and is arranged on the rotation track of the transmission shaft;

[0031] When the first driving member drives the driving shaft to rotate, due to the setting of the transmission shaft, the driving shaft can drive the cylinder body to rotate. When the cylinder body and the driving shaft are inclined, when the first driving member drives the cylinder body to rotate through the driving shaft, the cylinder body rotates one circle with its own axis as the rotation axis, and the plunger in the plunger chamber continuously switches between the two states of being away from the distribution plate and being close to the distribution plate: when the driving shaft drives the plunger to move in the direction away from the distribution plate, the volume of the plunger chamber increases and the pressure decreases, and the working medium is sucked into the plunger chamber from the distribution plate under the action of the pressure difference; on the contrary, when the driving shaft drives the plunger to move in the direction close to the distribution plate, the volume of the plunger chamber decreases and the pressure increases, and the working medium is discharged from the plunger chamber into the distribution plate under the action of the pressure difference; in short, when the first driving member drives the cylinder body to rotate one circle through the driving shaft and the transmission shaft, the hydraulic pump realizes the suction and discharge of the working medium once;

[0032] When the hydraulic pump is in working state, the second driving member can be started first, and the second driving member drives the cylinder body to rotate in the direction close to or away from the driving shaft, and then changes the angle between the cylinder body axis and the driving shaft axis, that is, changes the cylinder body inclination angle and the movement stroke of the plunger, so as to realize the change of the suction and displacement of the hydraulic pump. Moreover, when the transmission shaft abuts against the first limiter, the angle between the axis of the driving shaft and the cylinder body axis is 45°, which means that the maximum inclination angle of the cylinder body in the present invention is 45°. Obviously, compared with the hydraulic pump in the prior art that cannot adjust the inclination angle or the inclination angle cannot reach 45°, the present invention greatly improves the output power of the hydraulic pump;

[0033] Furthermore, in the present invention, the second limiter is arranged on the side of the rotation area away from the transmission shaft, the second limiter is in contact with the transmission shaft, and the second limiter can apply a first force to the transmission shaft, and the first force is from the side away from the transmission shaft to the side close to the transmission shaft, which means that when the second driving member drives the cylinder body to rotate to a set angle in a direction close to or away from the driving shaft, under the action of the first force, the transmission shaft will not move in a direction close to the cylinder body or the driving shaft, so that the inclination angle of the cylinder body can be stably maintained at the set angle, so that the hydraulic pump can stably output the required displacement of the working medium, so that the hydraulic pump can operate with a larger output power;

[0034] Furthermore, the hydraulic pump in the present invention also includes a third limit member, which can apply a second force to the second limit member. The second force prevents the second limit member from separating from the driving shaft and / or the cylinder body during the assembly of the hydraulic pump, so that the second limit member can continuously suppress the transmission shaft from moving toward the side close to the cylinder body and / or the driving shaft, so that the hydraulic pump can continuously and stably output the required displacement of the working medium and operate stably with a larger output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 is a cross-sectional view of a hydraulic pump;

[0037] Figure 2 It is a top view of the transmission shaft and the driving shaft;

[0038] Figure 3 It is the longitudinal section of the driving shaft;

[0039] Figure 4 is a side view of the transmission shaft;

[0040] Figure 5 It is the AA section view of the transmission shaft;

[0041] Figure 6 is a top view of the motion ring;

[0042] Figure 7 It is the BB cross-section view of the motion ring;

[0043] Figure 8 is a longitudinal section of the plunger;

[0044] Fig. 9 It is a structural schematic diagram when the cylinder body inclination angle is 45°;

[0045] Fig.10 is a schematic diagram of the structure of the first end of the cylinder body;

[0046] Fig.11 is a schematic diagram of the structure of the second end of the driving shaft;

[0047] Among them, 1. driving shaft; 2. third limiter; 3. copper sleeve; 4. plunger; 5. plunger ring; 6. first fastener; 7. preload; 8. preload seat; 9. first force transmission member; 10. transmission shaft; 11. moving ring; 12. swing cylinder; 13. cylinder body; 14. bearing; 15. positioning member; 16. distribution plate; 17. wear-resistant part; 18. positioning rod; 19. end cover; 20. second fastener; 21. first slide groove; 22. first limiter; 23. plunger hole; 24. sliding member; 25. plunger cavity; 26. rotating area; 27. second slide groove. DETAILED DESCRIPTION

[0048] 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.

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] like Figures 1 to 11As shown, the present invention discloses a hydraulic pump, which includes: a driving shaft 1 and a first driving member, the driving shaft 1 is transmission-connected with the first driving member, the first driving member is used to drive the driving shaft 1 to rotate with the axis of the driving shaft 1 as the rotating shaft; a cylinder body 13, a first end of the cylinder body 13 is provided with a plurality of plunger cavities 25 along the circumference of the cylinder body 13, the plunger cavity 25 extends along the axial direction of the cylinder body 13, and a distribution plate 16 is provided at the second end of the cylinder body 13, and an inlet and outlet connected to the plunger cavity 25 are provided on the distribution plate 16; a second driving member, the second driving member is transmission-connected with the cylinder body 13, and the second driving member is used to drive the cylinder body 13 to rotate in a direction close to and away from the driving shaft 1; a plunger 4, a first end of the plunger 4 is rotationally connected with the second end of the driving shaft 1, and the second end of the plunger 4 is slidably matched with the plunger cavity 25 in the axial direction of the plunger cavity 25, and is rotationally connected; a transmission shaft 10, the two ends of the transmission shaft 10 are transmission-connected with the driving shaft 1 and the cylinder body 13 respectively, and the driving shaft 1 can be connected with the cylinder body 13 through the transmission shaft 10 The cylinder body 13 rotates, and the transmission shaft 10 and the plunger 4 are arranged to avoid each other; a first limiter 22, the first limiter 22 is located outside the transmission shaft 10 and on the rotation trajectory of the transmission shaft 10. When the transmission shaft 10 abuts against the first limiter 22, the angle between the axis of the driving shaft 1 and the axis of the cylinder body 13 is 45°; a second limiter, the second limiter is arranged on the side of the driving shaft 1 and / or the cylinder body 13 away from the transmission shaft 10, the second limiter abuts against the transmission shaft 10, and the second limiter A first force is applied to the transmission shaft 10, and the first force is set from the side away from the transmission shaft 10 toward the side close to the transmission shaft 10; a third limit member 2, the third limit member 2 applies a second force to the second limit member, and the direction of the second force is set opposite to the direction in which the second limit member disengages from the active shaft 1 and / or the cylinder body 13, and the second force is used to prevent the second limit member from disengaging from the active shaft 1 and / or the cylinder body 13, and the third limit member 2 and the second limit member are set to avoid the transmission shaft 10.

[0051] When the first driving member drives the driving shaft 1 to rotate, due to the setting of the transmission shaft 10, the driving shaft 1 can drive the cylinder body 13 to rotate. When the cylinder body 13 and the driving shaft 1 are tilted, when the first driving member drives the cylinder body 13 to rotate through the driving shaft 1, the cylinder body 13 rotates one circle with its own axis as the rotation axis, and the plunger 4 in the plunger cavity 25 continuously switches between the two states of being away from the distribution plate 16 and being close to the distribution plate 16: when the driving shaft 1 drives the plunger 4 to move in the direction away from the distribution plate 16, the plunger cavity When the volume of the piston chamber 25 increases and the pressure decreases, the working medium is sucked into the piston chamber 25 from the valve plate 16 under the action of the pressure difference. On the contrary, when the driving shaft 1 drives the plunger 4 to move toward the valve plate 16, the volume of the piston chamber 25 decreases and the pressure increases. Under the action of the pressure difference, the working medium is discharged from the piston chamber 25 into the valve plate 16. In short, when the first driving member drives the cylinder body 13 to rotate one circle through the driving shaft 1 and the transmission shaft 10, the hydraulic pump realizes the suction and discharge of the working medium once.

[0052] When the hydraulic pump is in working state, the second driving member can be started first, and the second driving member drives the cylinder body 13 to rotate in the direction close to or away from the driving shaft 1, and then changes the angle between the axis of the cylinder body 13 and the axis of the driving shaft 1, that is, changes the inclination angle of the cylinder body 13 and the movement stroke of the plunger 4, so as to realize the change of the suction and displacement of the hydraulic pump, and because when the transmission shaft 10 abuts against the first limiter 22, the angle between the axis of the driving shaft 1 and the axis of the cylinder body 13 is 45°, which means that the maximum inclination angle of the cylinder body 13 in the present invention is 45° (the inclination angle of the cylinder body 13 refers to the inclination angle of the cylinder body 13 The angle between the axis and the axis of the driving shaft 1 is obviously that the output power of the hydraulic pump is greatly improved compared with the hydraulic pump in the prior art that cannot adjust the inclination angle or the inclination angle cannot reach 45°; after starting the second driving member and adjusting the inclination angle of the cylinder body 13 to the set value (the set value is the inclination angle value of the cylinder body 13 required for the working condition, and the inclination angle range of the cylinder body 13 of the present invention is 0°~45°, including 0° and 45°), the first driving member can be started, and the driving shaft 1, the cylinder body 13 and other structures are driven to rotate through the first driving member, so that the hydraulic pump can inhale and discharge the working medium;

[0053] In the prior art, after the hydraulic pump changes the cylinder inclination angle, the cylinder is prone to offset during the operation of the hydraulic pump, causing the cylinder inclination angle to change during the operation of the hydraulic pump, thereby making it impossible for the hydraulic pump to output the corresponding displacement of the working medium at the required inclination angle.

[0054] Furthermore, in the present invention, the second limiter is arranged on the side of the driving shaft 1 and / or the cylinder body 13 away from the transmission shaft 10, the second limiter is in contact with the transmission shaft 10, and the second limiter can apply a first force to the transmission shaft 10, and the first force is from the side away from the transmission shaft 10 toward the side close to the transmission shaft 10, which means that when the second driving member drives the cylinder body 13 to rotate to a set angle in a direction close to or away from the driving shaft 1, under the action of the first force, the transmission shaft 10 will not move in a direction close to the cylinder body 13 or the driving shaft 1, so that the inclination angle of the cylinder body 13 can be stably maintained at the set angle. Angle, so that the hydraulic pump can stably output the working medium of the required displacement, so that the hydraulic pump can operate with a larger output power; furthermore, the hydraulic pump in the present invention also includes a third limit member 2, and the third limit member 2 can apply a second force to the second limit member. The second force prevents the second limit member from separating from the driving shaft 1 and / or the cylinder body 13 during the assembly and use of the hydraulic pump, so that the second limit member can continuously suppress the transmission shaft 10 from moving in the direction close to the cylinder body 13 or the driving shaft 1, so that the hydraulic pump can continuously and stably output the working medium of the required displacement and operate stably with a larger output power.

[0055] The working medium sucked in and discharged by the hydraulic pump in the present invention can specifically be a medium capable of energy transfer, such as hydraulic oil. The transmission connection between the driving shaft 1 and the first driving member means that the first driving member can drive the driving shaft 1 to rotate with the axis of the driving shaft 1 as the rotating axis, and the transmission connection between the second driving member and the cylinder body 13 means that the second driving member can drive the cylinder body 13 to rotate in the direction close to and away from the driving shaft 1. The first driving member can specifically be a driving device such as a rotating motor that can drive the driving shaft 1 to rotate. The first driving member can specifically be connected to the first end of the driving shaft 1, or a transmission structure such as a gear set or a belt can be provided between the first driving member and the driving shaft 1, so that the first driving member is connected to the driving shaft 1 through the above-mentioned transmission structure. At this time, the area where the driving shaft 1 is transmission-connected to the first driving member can be not only the first end of the driving shaft 1, but also the area between the two ends of the driving shaft 1. Correspondingly, the second driving member can be specifically a hydraulic cylinder, a pneumatic cylinder, an electric push rod, or other linear driving device that can drive the cylinder body 13 to rotate in the direction close to and away from the driving shaft 1, and the second driving member can be connected to the second end of the cylinder body 13, or it can also be connected to the area between the two ends of the cylinder body 13.

[0056] The inlet and outlet refer to the inlet and outlet provided on the distribution plate 16, both of which are connected to the plunger cavity 25. The plunger cavity 25 is connected to the equipment providing the working medium from the outside through the inlet, and the plunger cavity 25 is connected to the outside requiring the working medium, such as a motor, through the outlet.

[0057] The first end of the driving shaft 1 is provided with a first fastener 6, which can be a screw or other structure, and the driving shaft 1 is installed at a corresponding position through the first fastener 6. Figure 8 As shown, the second end of the driving shaft 1 is provided with a plurality of plunger holes 23 along the circumference of the driving shaft 1, and a copper sleeve 3 is pressed into the plunger hole 23, and the copper sleeve 3 and the first end of the plunger 4 are rotatably matched. The second end of the plunger 4 is rotatably matched with the plunger cavity 25 through the plunger ring 5; the plunger ring 5 may not be used, and a bearing may be selected to realize the rotatable match between the plunger 4 and the plunger cavity 25. It should be noted that the copper sleeve does not have to be provided in the plunger hole 23, and a bearing or other structure may also be provided, or no additional structure is provided in the plunger hole 23, as long as the plunger hole 23 and the second end of the plunger 4 can be ensured to be rotatably matched, and the second end of the plunger 4 will not fall out of the plunger hole 23.

[0058] The transmission shaft 10 can be arranged in a variety of ways. Figure 1 , Fig. 9As shown, the first end of the transmission shaft 10 can be set between the first ends of several first pistons 4, the second end of the transmission shaft 10 can be set between the second ends of several first pistons 4, and the transmission shaft 10 needs to be set to avoid the first pistons 4 to ensure that the functions of the transmission shaft 10 and the plungers 4 can be smoothly realized without interfering with each other. At this time, the first end of the transmission shaft 10 and the second end of the driving shaft 1 are slidably matched in the axial direction of the driving shaft 1, and the second end of the transmission shaft 10 and the first end of the cylinder body 13 are slidably matched in the axial direction of the cylinder body 13. If the working conditions require, the first end of the transmission shaft 10 is rotatably connected to the second end of the driving shaft 1, and the second end of the transmission shaft 10 is rotatably connected to the first end of the cylinder body 13.

[0059] The first end of the transmission shaft 10 is provided with a first transmission part, and the second end of the transmission shaft 10 is provided with a second transmission part. The first transmission part and the second end of the driving shaft 1 are slidably matched in the axial direction of the driving shaft 1. The first transmission part applies a third force to the transmission shaft 10, and the third force causes the driving shaft 1 and the transmission shaft 10 to rotate synchronously. The second transmission part and the first end of the cylinder body 13 are slidably matched in the axial direction of the cylinder body 13, and the second transmission part applies a fourth force to the transmission shaft 10, and the fourth force causes the transmission shaft 10 and the cylinder body 13 to rotate synchronously. Among them, the two ends of the transmission shaft 10 are respectively connected to the second end of the driving shaft 1 and the first end of the cylinder body 13 in transmission connection, which can be understood as the matching relationship between the first transmission part and the second end of the driving shaft 1, and the matching relationship between the second transmission part and the first end of the cylinder body 13.

[0060] like Figure 1 , Figure 2 , Figure 4 , Fig. 9 As shown, the first transmission part includes a driving shaft 1, and a plurality of moving rings 11 arranged along the circumference of the transmission shaft 10. The moving ring 11 is sleeved on the outside of the first end of the transmission shaft 10. The moving ring 11 and the driving shaft 1 are slidably matched in the axial direction of the driving shaft 1, and the moving ring 11 and the driving shaft 1 are frictionally matched. At this time, the third force is the force applied by the driving shaft 1 to the moving ring 11, i.e., the transmission shaft 10 when the driving shaft 1 rotates with the first driving member; the driving shaft 1 and / or the moving ring 11 may also be provided with a coating for reducing the friction between the driving shaft 1 and the moving ring 11, but not eliminating the friction between the driving shaft 1 and the moving ring 11.

[0061] Alternatively, the first end of the transmission shaft 10 and the driving shaft 1 are slidably fitted on the axis of the driving shaft 1 and frictionally fitted. At this time, the first transmission part includes the first end of the transmission shaft 10 and the driving shaft 1, and the third force is the force applied by the driving shaft 1 to the transmission shaft 10 when the driving shaft 1 is driven to rotate by the first driving member; similarly, the driving shaft 1 and / or the transmission shaft 10 may also be provided with a coating for reducing the friction between the driving shaft 1 and the transmission shaft 10, but not eliminating the friction between the driving shaft 1 and the transmission shaft 10.

[0062] The second transmission part is arranged in a similar manner to the first transmission part, that is, the second transmission part includes a cylinder body 13 and a plurality of moving rings 11 arranged along the circumference of the transmission shaft 10, the moving ring 11 is sleeved on the second end of the transmission shaft 10, the moving ring 11 and the cylinder body 13 are slidingly matched in the axial direction of the cylinder body 13, and the moving ring 11 and the cylinder body 13 are frictionally matched. At this time, the fourth force is the force applied by the transmission shaft 10 to the cylinder body 13 when the transmission shaft 10 rotates; or, the second end of the transmission shaft 10 and the cylinder body 13 are slidingly matched on the axis of the cylinder body 13, and are frictionally matched. At this time, the second transmission part includes the second end of the transmission shaft 10 and the cylinder body 13, and the fourth force is the force applied by the transmission shaft 10 to the cylinder body 13 when the transmission shaft 10 rotates.

[0063] Alternatively, the transmission shaft 10 may not be arranged between the several first pistons 4, but may be arranged outside the cylinder body 13 and the driving shaft 1. In this case, the two ends of the transmission shaft 10 need to be respectively slidably connected with the cylinder body 13 and the driving shaft 1 in the axial direction of the cylinder body 13 and the driving shaft 1, and the several transmission shafts 10 arranged outside the cylinder body 13 and the driving shaft 1 are arranged to avoid the driving shaft 1 and the cylinder body 13, so that the first driving member can continue to pass through the driving shaft 1, and the transmission shaft 10 drives the cylinder body 13 to rotate. The setting of the transmission shaft 10 needs not to affect the rotation of the cylinder body 13 toward and away from the driving shaft 1.

[0064] In the present invention, the first stopper 22 includes a rotation area 26 disposed at the second end of the driving shaft 1 and / or the first end of the cylinder body 13, and the rotation area 26 is disposed from the axis close to the driving shaft 1 and / or the cylinder body 13 to the axis away from the driving shaft 1 and / or the cylinder body 13; this means that the rotation area 26 can be disposed only at the second end of the driving shaft 1 or the first end of the cylinder body 13, or the rotation area 26 can be disposed at both the second end of the driving shaft 1 and the first end of the cylinder body 13. Figure 1 As shown, the setting mode of the rotation area 26 is described when the rotation area 26 is only set at the second end of the driving shaft 1. At this time, the rotation area 26 extends from the axis close to the driving shaft 1 to the direction away from the axis of the driving shaft 1. Specifically, it can extend outward along the radial direction of the driving shaft 1, or it can extend outward along the direction that is inclined to the axial direction of the driving shaft 1 but not radially. The rotation area 26 can be understood as a first rotation groove set at the second end of the driving shaft 1. The rotation area 26 provides a rotation space for the transmission shaft 10 to rotate, more specifically, for the cylinder body 13 to rotate in the direction close to and away from the driving shaft 1. Figure 1 , Figure 3 , Figures 9 to 11 As shown, the longitudinal section of the rotation area 26 gradually increases from the direction away from the transmission shaft 10 to the direction close to the transmission shaft 10, and the longitudinal section of the rotation area 26 can be funnel-shaped. Alternatively, the rotation area 26 can also include a groove opened at the second end of the driving shaft 1, and the groove can be opened along the axial direction of the driving shaft 1 or arranged along an inclination relative to the axial direction of the driving shaft 1.

[0065] And / or, the first limit member 22 includes a limit shell arranged outside the transmission shaft 10, the limit shell and the driving shaft 1 and the cylinder body 13 are independently arranged, the limit shell is an annular shell, and is sleeved on the outside of the transmission shaft 10. When the inclination angle of the cylinder body 13 is 45°, the transmission shaft 10 and the limit shell are offset. In other words, the limit shell limits the cylinder body 13 from continuing to move away from the driving shaft 1, so that the maximum inclination angle of the cylinder body 13 is 45°; the limit shell and the driving shaft 1 and the cylinder body 13 are independently arranged, which can be understood as the limit shell is neither arranged on the driving shaft 1 nor on the cylinder body 13.

[0066] When the first position-limiting member 22 is a rotation area 26, the second position-limiting member is matched with the rotation area 26. For example, if the rotation area 26 is provided at the second end of the driving shaft 1, the second position-limiting member is provided on the driving shaft 1 and is located on the side of the rotation area 26 away from the transmission shaft 10, and / or if the first end of the cylinder body 13 is provided with the rotation area 26, the cylinder body 13 is provided with a second position-limiting member on the side of the rotation area 26 away from the transmission shaft 10. If the first position-limiting member 22 is a position-limiting housing, the second position-limiting member may be provided on the side of the cylinder body 13 away from the transmission shaft 10 and / or on the side of the driving shaft 1 away from the transmission shaft 10.

[0067] like Figure 1 , Fig. 9 As shown, the second limit member includes a preload member 7 and a preload seat 8, the preload member 7 is located on the side of the preload seat 8 away from the transmission shaft 10, the preload seat 8 is slidably matched with the active shaft 1 or the cylinder body 13, the preload member 7 applies a fifth force to the preload seat 8, and the fifth force is set from the direction away from the transmission shaft 10 toward the direction close to the transmission shaft 10, the preload member 7 can be specifically a spring or other structure that can apply the fifth force to the preload seat 8, the preload seat 8 can be connected to the preload member 7, or abut against the preload member 7, the preload seat 8 can be understood as a structure that transmits the force of the preload member 7 to the transmission shaft 10; or, the second limit member includes a third drive member, the third drive member applies a sixth force to the transmission shaft 10, and the sixth force is set from the direction away from the transmission shaft 10 toward the direction close to the transmission shaft 10; the third drive member can be specifically a linear drive device such as an electric push rod or a cylinder, which can apply a force to the transmission shaft 10 to prevent the transmission shaft 10 from moving in the direction away from the transmission shaft 10.

[0068] The third stopper 2 is arranged along the radial direction of the driving shaft 1, or is arranged obliquely relative to the driving shaft 1; and / or, the third stopper 2 is arranged along the radial direction of the cylinder body 13, or is arranged obliquely relative to the cylinder body 13. The third stopper 2 can be a flexible pin. Fig.11 As shown, one end of the third limiting member 2 extends out of the first sliding slot 21 .

[0069] And / or, a first force transmission member 9 is provided between the transmission shaft 10 and the first stopper 22, and the first force transmission member 9 abuts against the transmission shaft 10 and the first stopper 22 respectively, and a second force transmission member is provided between the cylinder body 13 or the driving shaft 1 and the transmission shaft 10, and the second force transmission member abuts against the driving shaft 1 or the cylinder body 13 and the transmission shaft 10 respectively; Figure 1 , Fig. 9 As shown, the first force transmission member 9 and the second force transmission member may specifically be pressure pins.

[0070] In the area near both ends of the transmission shaft 10 on the transmission shaft 1, a plurality of sliding members 24 are uniformly distributed along the circumference of the transmission shaft 10, and the sliding members 24 are slidably matched with the driving shaft 1 or the cylinder body 13. The sliding members 24 can be specifically sliders extending radially from the transmission shaft 10. When the first transmission part includes the moving ring 11, the moving ring 11 is sleeved on the sliders. Figure 2 As shown, a first slide groove 21 opened along the axial direction of the driving shaft 1 is provided on the second end of the driving shaft 1, and a second slide groove 27 opened along the axial direction of the cylinder body 13 is provided on the first end of the cylinder body 13. The first slide groove 21 and the second slide groove 27 are respectively slidably matched with the sliding members 24 at both ends of the transmission shaft 10. According to the different number of sliding members 24, the two ends of the transmission shaft 10 can be triangular joints or universal joints.

[0071] The hydraulic pump also includes a lubrication channel, the inlet of which is connected to an external lubrication medium source, which may be a device capable of adding lubrication medium to the lubrication channel, such as an oil storage tank connected to the inlet of the lubrication channel, and a delivery pump is provided between the oil storage tank and the inlet of the lubrication channel. The contact area between the transmission shaft 10 and the active shaft 1, the cylinder body 13, and the first stopper 22 are all connected to the lubrication channel; by injecting lubrication medium into the lubrication channel, the lubrication medium can flow through the cylinder body 13, the transmission shaft 10, and the first stopper 22, and lubricate the cylinder body 13, the transmission shaft 10, and the first stopper 22, thereby reducing friction damage to the cylinder body 13, the transmission shaft 10, and the first stopper 22 during the operation of the hydraulic pump structure.

[0072] In addition, the hydraulic pump includes a housing, the cylinder body 13 and the driving shaft 1 are both located in the housing, the housing is provided with a plurality of heat dissipation windows, the driving shaft 1 is provided with a plurality of heat dissipation disks, and a plurality of heat dissipation hole groups connected to the heat dissipation windows are provided along the circumference of the heat dissipation disk, the heat dissipation hole group includes square holes and arc holes arranged at intervals along the circumference of the heat dissipation disk, and a guide plate arranged in the square hole, and the guide plate and the heat dissipation disk are arranged obliquely; the heat dissipation window is connected to the outside or the heat dissipation device, and the heat dissipation hole group connected to the heat dissipation window is arranged on the heat dissipation disk, so that the heat generated by the structure of the hydraulic pump such as the driving shaft 1 during operation can be dissipated in time, thereby reducing the problem of damage caused by overheating of the hydraulic pump. The guide plate reduces the flow area of ​​the gas at the square hole, increases the flow speed of the gas, and accelerates the heat dissipation of the hydraulic pump.

[0073] The present invention also provides a recovery channel and a lubrication hole at one end of the distributor plate 16 facing the cylinder body 13. The recovery channel and the lubrication hole are arranged in sequence from the inside to the outside. The recovery channel is connected to the lubrication hole, but the recovery channel is not connected to the lubrication hole. The excess working medium between the distributor plate 16 and the second end of the cylinder body 13 can be recovered through the recovery channel and recovered to an external storage device. The working medium in the external storage device is then transported to the distributor plate 16 by a pump, so that the excess working medium flows into the distributor plate 16 and the second end of the cylinder body 13 through the lubrication hole to form a lubrication layer, thereby reducing the friction between the distributor plate 16 and the second end of the cylinder body 13.

[0074] like Figure 1 , Fig. 9 As shown, the present invention is provided with a swing cylinder 12 outside the cylinder body 13, and the lower part of the swing cylinder 12 is fixed with an end cover 19 through a second fastener 20, and the end cover 19 is connected to the lower part of the cylinder body 13 through a positioning member 15. At this time, the first driving member is connected to the swing cylinder 12 in a transmission manner, and because the swing cylinder 12, the cylinder body 13 and the end cover 19 are fixed together through the second fastener 20 and the positioning member 15, when the first driving member drives the swing cylinder 12 to rotate in the direction close to and away from the driving shaft 1, the cylinder body 13 also rotates accordingly. The positioning member 15 can be a positioning pin or other structure that can play a fixed connection, and the second fastener 20 can be a screw or bolt or other structure that can play a fixed connection. In addition, the present invention is provided with a wear-resistant member 17 such as a liner between the end cover 19 and the distribution plate 16. By providing the wear-resistant member 17, the wear between the cylinder body 13 and the end cover 19 during the operation of the hydraulic pump can be reduced, thereby reducing the maintenance cost of the hydraulic pump. At the same time, the present invention has a positioning rod 18 inserted into the end cover 19, and the positioning rod 18 is rotatably connected to the cylinder body 13 through the bearing 14. Figure 1 , Fig. 9 As shown, when the hydraulic pump includes structures such as an end cover 19 and a swing cylinder 12, the lubrication channel includes a first lubrication channel provided on the swing cylinder 12 and connected to an external lubrication medium source, a second lubrication channel provided on the end cover 19 and connected to the first lubrication channel, and the second lubrication channel is connected to the cylinder body 13 through a third lubrication channel in the positioning rod 18. At this time, if a first force transmission member 9 and a second force transmission member are provided, the third lubrication channel sequentially passes through the cylinder body 13, the second force transmission member, the transmission shaft 10, and the first force transmission member 9. It should be noted that the lubrication channel is connected to each structure of the channel, so that structures such as the cylinder body 13, the transmission shaft 10, and the driving shaft 4 can be lubricated by the lubrication medium during operation.

[0075] In addition, the present invention also provides a speed change system, which includes the above-mentioned hydraulic pump. The speed change system can specifically be a transmission or other structure that can apply the above-mentioned hydraulic pump.

[0076] In this article, "and / or" means that in the same sentence, the text content before "and / or" and the text content after "and / or" can exist separately or at the same time; for example, A and / or B includes the situation where only A or B exists, and the situation where both A and B exist.

[0077] The present invention discloses multiple technical solutions, but does not provide any contrary technical inspiration.

[0078] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hydraulic pump, characterized in that: The hydraulic pump comprises: A driving shaft and a first driving member, wherein the driving shaft is in transmission connection with the first driving member, and the first driving member is used to drive the driving shaft to rotate with the axis of the driving shaft as the rotating axis; A cylinder body, wherein a first end of the cylinder body is provided with a plurality of plunger cavities along the circumference of the cylinder body, the plunger cavities extending along the axial direction of the cylinder body, a distribution plate is provided at the second end of the cylinder body, and the distribution plate is provided with an inlet and outlet communicating with the plunger cavities; A second driving member, the second driving member is drivingly connected to the cylinder body, and the second driving member is used to drive the cylinder body to rotate in a direction close to and away from the driving shaft; A plunger, wherein the first end of the plunger is rotatably connected to the second end of the driving shaft, and the second end of the plunger is slidably matched with the plunger cavity in the axial direction of the plunger cavity and is rotatably connected; A transmission shaft, both ends of which are respectively connected to the driving shaft and the cylinder body, the driving shaft can drive the cylinder body to rotate through the transmission shaft, and the transmission shaft and the plunger are arranged to avoid each other; a first stopper, the first stopper being located outside the transmission shaft and on the rotation track of the transmission shaft, and when the transmission shaft abuts against the first stopper, the angle between the axis of the driving shaft and the axis of the cylinder body is 45°; A second limiter, the second limiter is arranged on a side of the driving shaft and / or the cylinder body away from the transmission shaft, the second limiter abuts against the transmission shaft, and the second limiter applies a first force to the transmission shaft, and the first force is arranged from the side away from the transmission shaft toward the side close to the transmission shaft; A third limit member applies a second force to the second limit member, the direction of the second force is opposite to the direction in which the second limit member is separated from the driving shaft and / or the cylinder body, the second force is used to prevent the second limit member from being separated from the driving shaft and / or the cylinder body, and the third limit member and the second limit member are arranged to avoid the transmission shaft.

2. The hydraulic pump according to claim 1, characterized in that: The first end of the transmission shaft is located between the first ends of the plurality of plungers, and the second end of the transmission shaft is located between the second ends of the plurality of plungers; Alternatively, the hydraulic pump includes a plurality of transmission shafts, wherein the transmission shafts are located outside the cylinder body and the driving shaft, and the transmission shafts are arranged to avoid the cylinder body and the driving shaft.

3. The hydraulic pump according to claim 1, characterized in that: A first transmission part is provided at the first end of the transmission shaft, and a second transmission part is provided at the second end of the transmission shaft. The first transmission part and the second end of the driving shaft are slidably matched in the axial direction of the driving shaft, and the first transmission part applies a third force to the transmission shaft, and the third force enables the driving shaft to drive the transmission shaft to rotate, and the second transmission part and the first end of the cylinder body are slidably matched in the axial direction of the cylinder body, and the second transmission part applies a fourth force to the transmission shaft, and the fourth force enables the transmission shaft to drive the cylinder body to rotate.

4. The hydraulic pump according to claim 3, characterized in that: The first transmission part includes the driving shaft and a plurality of movement rings arranged along the circumference of the transmission shaft, wherein the movement ring is sleeved outside the first end of the transmission shaft, the movement ring and the driving shaft are slidably matched in the axial direction of the driving shaft, and the movement ring and the driving shaft are frictionally matched; Alternatively, the first end of the transmission shaft and the driving shaft are slidably matched and frictionally matched on the axis of the driving shaft. In this case, the first transmission part includes the first end of the transmission shaft and the driving shaft.

5. The hydraulic pump according to claim 1, characterized in that: The first stopper comprises a rotation area provided at the second end of the driving shaft and / or the first end of the cylinder body, and the rotation area is arranged from close to the axis of the driving shaft and / or the cylinder body to away from the axis of the driving shaft and / or the cylinder body; Alternatively, the first limiting member includes a limiting housing arranged outside the transmission shaft, and the limiting housing, the driving shaft, and the cylinder body are independently arranged.

6. The hydraulic pump according to claim 1, characterized in that: The second position-limiting member includes a pre-tightening member and a pre-tightening seat, wherein the pre-tightening member is located at a side of the pre-tightening seat away from the transmission shaft, the pre-tightening seat is slidably matched with the driving shaft or the cylinder body, and the pre-tightening member applies a fifth force to the pre-tightening seat, wherein the fifth force is set from a direction away from the transmission shaft toward a direction close to the transmission shaft; Alternatively, the second limiting member includes a third driving member, and the third driving member applies a sixth force to the transmission shaft, and the sixth force is set from a direction away from the transmission shaft to a direction close to the transmission shaft.

7. The hydraulic pump according to claim 1, characterized in that: The third position-limiting member is arranged along the radial direction of the driving shaft, or is arranged obliquely with respect to the driving shaft; and / or the third position-limiting member is arranged along the radial direction of the cylinder body, or is arranged obliquely with respect to the cylinder body; And / or, a first force transmission member is provided between the transmission shaft and the second end of the driving shaft, and / or a second force transmission member is provided between the transmission shaft and the first end of the cylinder body; The hydraulic pump further comprises a lubrication channel, an inlet of which is connected to an external lubrication medium source, and the transmission shaft and the driving shaft, the contact area of ​​the cylinder body, and the first limit member are all connected to the lubrication channel.

8. The hydraulic pump according to claim 1, characterized in that: The hydraulic pump includes a housing, the cylinder body and the driving shaft are both located in the housing, the housing is provided with a plurality of heat dissipation windows, the driving shaft is provided with a plurality of heat dissipation plates, the heat dissipation plates are provided with a plurality of heat dissipation hole groups connected with the heat dissipation windows, the heat dissipation hole groups include square holes, and guide plates arranged in the square holes, and the guide plates and the heat dissipation plates are arranged at an angle.

9. The hydraulic pump according to claim 1, characterized in that: A recovery channel and a lubrication hole are provided at one end of the distribution plate facing the cylinder body, and the recovery channel and the lubrication hole are arranged in sequence from the inside to the outside.

10. A speed change system, characterized in that: The speed change system comprises the hydraulic pump according to any one of claims 1-9.

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