Variable adjusting device, plunger variable pump and plunger variable motor

Abstract

The utility model relates to a hydraulic device, in particular to a variable adjusting device, a plunger variable pump and a plunger variable motor. The variable adjusting device comprises the swash plate and the adjusting mechanism, the adjusting mechanism adjusts the included angle between the axis of the swash plate and the rotating axis of the transmission shaft, and then the stroke of the plunger is changed. The pushing face of the swash plate is connected with one end of the pull pin in a pluggable mode, and the other end of the pull pin is fixed to the inner ring of the spherical hinge bearing. Meanwhile, the adjusting mechanism abuts against the bottom face of a ball seat of the spherical hinge bearing and acts on the swash plate through a pull pin. The variable adjusting device is simple in structure, the spherical hinge bearing and the pull pin serve as connecting parts of the swash plate and the adjusting mechanism, the advantage that the spherical hinge bearing bears multidirectional acting force is utilized, and the response speed of angle adjustment of the swash plate is increased. Meanwhile, the spherical hinge bearing serves as a standard part, the standardization level is improved, the internal gap of the spherical hinge bearing is small, impact on the swash plate in the variable process is reduced, and the variable process is more stable.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to hydraulic devices, in particular to a variable regulating device, a plunger variable pump and a plunger variable motor. BACKGROUND

[0002] In hydraulic systems, plunger variable pumps and plunger variable motors generally use axial pistons to push swash plates to change the tilt angle, adjust the stroke of the plunger, and further change the displacement of the hydraulic pump.

[0003] However, in conventional plunger variable pumps and plunger variable motors, the axial piston directly contacts the plane of the sliding shoe at the bottom of the piston sleeve to push the swash plate to adjust the tilt angle. During this period, the tilt angle adjustment of the swash plate is slow due to the large friction between the two, and the sliding shoe is prone to wear, resulting in a decrease in service life. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problem of large frictional resistance and insufficient wear resistance of the swash plate adjusting assembly of the plunger variable pump or plunger variable motor in the prior art under speed and pressure change conditions, the present disclosure provides a variable regulating device, a plunger variable pump and a plunger variable motor.

[0005] The present disclosure provides a variable regulating device applied to a plunger variable pump or a plunger variable motor, comprising:

[0006] a swash plate;

[0007] an adjusting mechanism configured to adjust the included angle between the axis of the swash plate and the rotation axis of the transmission shaft to adjust the stroke of the plunger;

[0008] The pushing surface of the swash plate is connected to one end of the pull pin in a pluggable manner, the other end of the pull pin is fixed to the inner ring of the spherical hinge bearing, the adjusting mechanism abuts against the bottom surface of the ball seat of the spherical hinge bearing, and the adjusting mechanism acts on the swash plate through the pull pin.

[0009] In an embodiment of the present disclosure, the pull pin is provided with a limiting flange in the circumferential direction, and the limiting flange is configured to limit the depth of the pull pin inserted into the swash plate.

[0010] In an embodiment of the present disclosure, the pull pin is interference-fitted with the inner ring of the spherical hinge bearing.

[0011] In an embodiment of the present disclosure, the adjusting mechanism comprises a pushing assembly and a reset assembly, the pushing assembly and the reset assembly are symmetrically installed with respect to the axis of the swash plate, and

[0012] The pushing assembly is configured to push the swash plate to rotate under an external force to adjust the included angle between the axis of the swash plate and the rotation axis of the transmission shaft.

[0013] The resetting assembly is configured to push the swash plate back to the initial position after the external force applied to the pushing assembly is removed.

[0014] In one embodiment of the present disclosure, the pushing assembly comprises a first piston sleeve, a first piston, and an adjusting rod,

[0015] The end surface of the first piston sleeve is in abutment with the bottom surface of the ball seat of the ball joint bearing.

[0016] The adjusting rod is coaxially arranged with the first piston, is arranged inside the first piston sleeve, and reciprocates along the axial direction of the first piston sleeve, and the adjusting rod is configured to adjust the included angle between the axis of the swash plate and the rotation axis of the transmission shaft through the first piston sleeve under an external force.

[0017] In one embodiment of the present disclosure, the resetting assembly comprises a piston rod, a resetting spring, and a second piston sleeve,

[0018] The second piston sleeve is fixed relative to the cylinder body of the piston pump, the end of one end of the piston rod is in abutment with the bottom surface of the ball seat of the ball joint bearing, and the other end is arranged inside the second piston sleeve and reciprocates along the axial direction of the second piston sleeve.

[0019] The resetting spring is pre-pressed between the piston rod and the second piston sleeve, and is configured to push the swash plate back to the initial position after the external force applied to the adjusting rod is removed.

[0020] In one embodiment of the present disclosure, the swash plate is provided with an oil supply channel in the radial direction, and the oil supply channel is arranged to supply oil to the contact surface between the pin and the swash plate.

[0021] In one embodiment of the present disclosure, the first piston is sequentially provided with a first central hole and a second central hole in the axial direction, and the diameter of the first central hole is larger than that of the second central hole.

[0022] In one embodiment of the present disclosure, the first piston further comprises an oil supply hole arranged in the radial direction, and the oil supply hole is in communication with the first central hole.

[0023] In a second aspect, the present disclosure further provides a piston variable displacement pump, which comprises:

[0024] A pump body having an oil inlet and an oil outlet;

[0025] A cylinder body provided with a piston hole and configured to rotate relative to the pump body under the action of a transmission shaft;

[0026] a plunger movably arranged in the plunger bore and configured to reciprocate in the plunger bore under the action of the swash plate and the transmission shaft to suck the medium from the inlet oil passage into the plunger bore, compress the medium, and then discharge the medium from the outlet oil passage;

[0027] The variable adjustment device of any one of the above.

[0028] In a third aspect, the disclosure also provides a plunger variable motor, which comprises:

[0029] a pump body having an inlet oil passage and an outlet oil passage;

[0030] a cylinder body provided with a plunger bore;

[0031] a plunger configured to reciprocate axially along the plunger bore under the action of the medium in the inlet oil passage and the swash plate, and drive the cylinder body to rotate together with the transmission shaft;

[0032] The variable adjustment device of any one of the above.

[0033] An advantage of the disclosure is that the variable adjustment device provided by the disclosure comprises a swash plate and an adjustment mechanism, wherein the adjustment mechanism adjusts the included angle between the axis of the swash plate and the rotation axis of the transmission shaft, thereby changing the stroke of the plunger. The pushing surface of the swash plate is connected to one end of the pull pin in a pluggable manner, and the other end of the pull pin is fixed to the inner ring of the spherical hinge bearing. At the same time, the adjustment mechanism abuts against the bottom surface of the ball seat of the spherical hinge bearing and acts on the swash plate through the pull pin.

[0034] The variable adjustment device provided by the disclosure has a simple structure, uses the spherical hinge bearing and the pull pin as the connecting components of the swash plate and the adjustment mechanism, fully utilizes the advantage of the spherical hinge bearing in bearing multidirectional force, and accelerates the response speed of the angle adjustment of the swash plate.

[0035] At the same time, the spherical hinge bearing is a standard part, which is easy to purchase, reduces the processing cost, improves the standardization level, and has a small internal gap, which is beneficial to reduce the impact on the swash plate during the variable process, so that the variable process is more stable.

[0036] Other features of the disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, which description should be taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure.

[0038] Figure 1is a structural schematic view of a variable adjustment device provided by an embodiment of the present disclosure;

[0039] Figure 2 is a connection schematic view of a swash plate and a pull pin and a spherical hinge bearing provided by an embodiment of the present disclosure;

[0040] Figure 3 is a structural schematic view of a pushing assembly provided by an embodiment of the present disclosure;

[0041] Figure 4 is a structural schematic view of a resetting assembly provided by an embodiment of the present disclosure.

[0042] Figures 1 to 4 A one-to-one correspondence between names of components and reference numerals in the following figures is as follows:

[0043] 1, swash plate; 11, oil supply channel;

[0044] 21, pushing assembly; 211, adjustment rod; 212, first piston; 2121, first center hole; 2122, second center hole; 2123, oil supply hole; 213, first piston sleeve; 22, resetting assembly; 221, piston rod; 222, resetting spring; 223, second piston sleeve;

[0045] 3, spherical hinge bearing;

[0046] 4, pull pin; 41, limiting flange;

[0047] A, top end position of swash plate; B, bottom end position of swash plate. DETAILED DESCRIPTION

[0048] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present disclosure unless specifically stated otherwise.

[0049] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the disclosure and its applications or uses.

[0050] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the description if appropriate.

[0051] Note that similar reference numerals and letters refer to similar items throughout the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0052] The specific embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0053] In the present disclosure, "upper", "lower", "front", "rear", "left", "right" and the like are only used to indicate the relative positional relationship between the relevant parts, and not to limit the absolute position of the relevant parts.

[0054] In the present disclosure, "first", "second" and the like are only used to distinguish each other, and not to indicate the importance and order, and the premise of each other.

[0055] In the present disclosure, "equal", "same" and the like are not strictly limited in the mathematical and / or geometric sense, but also include the errors allowed by the skilled person in manufacturing or use.

[0056] Referring to Figure 1 , in order to facilitate the understanding of the variable adjustment device provided by the present disclosure, it is necessary to first explain the influence of the inclination angle of the swash plate 1, i.e. the angle between the axis of the swash plate 1 and the rotation axis of the transmission shaft, on the stroke of the plunger.

[0057] Taking the plunger pump as an example, when the plunger is located at A of the swash plate 1, it reaches the top end, at this time, the volume between the plunger and the plunger hole reaches the maximum; when the plunger is located at B, it reaches the bottom end, at this time, the volume between the plunger and the plunger hole reaches the minimum.

[0058] In the process of changing the state of the plunger from the state shown at A to the state shown at B, i.e. the process of discharging the medium in the volume between the plunger and the plunger hole of the plunger pump out of the plunger pump. As can be seen, the distance between A and B in the axial direction is the size of the stroke of the plunger, which directly affects the displacement of the plunger pump.

[0059] The distance between A and B in the axial direction can be adjusted by changing the inclination angle of the swash plate 1, i.e. the angle a between the axis of the swash plate 1 and the rotation axis of the transmission shaft, and then adjusting the stroke of the plunger.

[0060] Specifically, the variable adjustment device provided by the present disclosure is applied to a plunger variable pump or a plunger variable motor, comprising a swash plate 1 and an adjusting mechanism, wherein the adjusting mechanism is configured to adjust the angle between the axis of the swash plate 1 and the rotation axis of the transmission shaft to adjust the stroke of the plunger; the pushing surface of the swash plate 1 is connected to one end of the pull pin 4 in a pluggable manner, the other end of the pull pin 4 is fixed to the inner ring of the spherical hinge bearing 3, the adjusting mechanism abuts against the bottom surface of the ball seat of the spherical hinge bearing 3, and the adjusting mechanism acts on the swash plate 1 through the pull pin 4.

[0061] As shown in Figure 1 , in the process of adjusting the angle between the axis of the swash plate 1 and the rotation axis of the transmission shaft, the user applies a force to the swash plate 1 through the adjusting mechanism, and then pushes the swash plate 1 to deflect. Specifically, the pushing surface of the swash plate 1 is connected to one end of the pull pin 4, and the other end of the pull pin 4 is arranged in the inner ring of the spherical hinge bearing 3.

[0062] When the adjusting mechanism is subjected to force, it abuts against the bottom surface of the ball seat of the ball bearing 3, and then transmits the force to the swashplate 1 through the pull pin 4, pushing the swashplate 1 to rotate, thereby adjusting the angle between the axis of the swashplate 1 and the axis of rotation of the drive shaft.

[0063] The variable adjustment device provided in this disclosure uses a ball joint bearing 3 and a pull pin 4 to realize the transmission between the adjustment mechanism and the swashplate 1, making full use of the advantage that the ball joint bearing 3 can withstand forces in multiple directions, and enhancing the flexibility of adjusting the tilt angle of the swashplate 1.

[0064] Meanwhile, as a standard component, the ball bearing 3 not only reduces the manufacturing cost of the variable adjustment device, but also, due to its compact internal structure, effectively reduces the impact of the adjustment device on the swashplate 1 during operation, making the variable adjustment process more stable.

[0065] In one embodiment of this disclosure, the pull pin 4 is provided with a limiting flange 41 in the circumferential direction, the limiting flange 41 being configured to limit the depth to which the pull pin 4 is inserted into the swashplate 1.

[0066] like Figure 3 As shown, the pin 4 is provided with an annular limiting flange 41. After the pin 4 is inserted into the swash plate 1, since the diameter of the hole in which the swash plate 1 and the pin 4 fit is smaller than the outer diameter of the limiting flange 41, the limiting flange 41 can limit the depth of the pin 4 inserted into the swash plate 1, so as to prevent the pin 4 from entering the swash plate 1 too much and causing the surface of the swash plate 1 to contact the ball bearing 3, thereby interfering with the movement of the ball bearing 3.

[0067] In addition, a countersunk hole is provided on the contact surface between the swash plate 1 and the limiting flange 41. During the processing, only the contact surface between the countersunk hole and the limiting flange 41 needs to be precision machined, and there is no need to precision machine the entire pushing surface of the swash plate 1, which reduces the processing cost.

[0068] Meanwhile, the high-precision fit between the contact surfaces of the swash plate 1 and the limiting flange 41 also helps to evenly apply the force to the surface of the swash plate 1 so as to drive the swash plate 1 to rotate.

[0069] To prevent the ball joint bearing 3 and the pull pin 4 from falling off due to unstable connection during the variable process, and considering that the ball joint bearing 3 and the pull pin 4 do not need to be disassembled frequently, in one embodiment of this disclosure, the pull pin 4 and the inner ring of the ball joint bearing 3 are interference-fitted.

[0070] In one embodiment of the present disclosure, the adjusting mechanism comprises a pushing assembly 21 and a resetting assembly 22, the pushing assembly 21 and the resetting assembly 22 are symmetrically arranged relative to the axis of the swash plate 1, and the pushing assembly 21 is configured to push the swash plate 1 to rotate under the action of an external force, so as to adjust the included angle between the axis of the swash plate 1 and the rotation axis of the transmission shaft; the resetting assembly 22 is configured to reset the swash plate 1 after the external force acting on the pushing assembly 21 is removed.

[0071] As shown in Figure 2 , the pushing assembly 21 and the resetting assembly 22 are symmetrically arranged relative to the axis of the swash plate 1, and the pushing assembly 21 is arranged to adjust the included angle between the axis of the swash plate 1 and the rotation axis of the transmission shaft by the ball hinge bearing 3 and the pull pin 4 under the action of an external force.

[0072] When the included angle between the axis of the swash plate 1 and the rotation axis of the transmission shaft reaches a preset angle, the adjustment is stopped. After the external force acting on the pushing assembly 21 is removed, the resetting assembly 22 reversely pushes the swash plate 1 to rotate, and finally makes the swash plate 1 return to the original position, so as to adjust the inclination angle of the swash plate 1 next time.

[0073] The variable adjusting device provided by the present disclosure realizes the adjustment of the inclination angle of the swash plate 1 under the action of an external force by arranging the pushing assembly 21 and the resetting assembly 22, and also realizes the recovery of the swash plate 1 to the original position after the external force disappears, so as to facilitate the subsequent adjustment of the inclination angle of the swash plate 1.

[0074] In one embodiment of the present disclosure, the pushing assembly 21 comprises a first piston sleeve 213, a first piston 212 and an adjusting rod 211, the end surface of the first piston sleeve 213 abuts against the bottom surface of the ball seat of the ball hinge bearing 3; the adjusting rod 211 is coaxially arranged with the first piston 212 and is arranged inside the first piston sleeve 213 and reciprocates along the axis of the first piston sleeve 213, and the adjusting rod 211 is configured to adjust the included angle between the axis of the swash plate 1 and the rotation axis of the transmission shaft through the first piston sleeve 213 under the action of an external force.

[0075] As shown in Figure 3 , the first piston sleeve 213 is provided with the first piston 212, and the adjusting rod 211 is arranged inside the first piston 212 and coaxially arranged with the first piston 212. When adjusting the included angle between the axis of the swash plate 1 and the rotation axis of the transmission shaft, the adjusting rod 211 is pushed to move axially along the first piston 212 by an external force, and finally the end of the adjusting rod 211 contacts the first piston sleeve 213 and pushes the first piston sleeve 213 to move towards the swash plate 1.

[0076] It should be noted that the above-mentioned pushing of the adjusting rod 211 to move axially along the first piston 212 by an external force, and the external force can be provided by the high-pressure medium of the control oil way inside the plunger variable pump or the plunger variable motor.

[0077] Since the end face of the first piston sleeve 213 abuts against the ball seat of the spherical hinge bearing 3, the external force finally acts on the swash plate 1 through the adjusting rod 211, the first piston sleeve 213, the spherical hinge bearing 3 and the pull pin 4, so that the swash plate 1 rotates.

[0078] During this process, the first piston 212 sleeved on the adjusting rod 211 positions the adjusting rod 211, so that the force acting on the adjusting rod 211 always acts on the middle position of the first piston sleeve 213, and the axis of the adjusting rod 211 coincides with the axis of the first piston sleeve 213, thereby avoiding additional overturning moment caused by the adjusting rod 211 acting on the first piston sleeve 213 without centring, and ensuring the force stability of the first piston sleeve 213.

[0079] In an embodiment of the present disclosure, the reset assembly 22 comprises a piston rod 221, a reset spring 222 and a second piston sleeve 223. The second piston sleeve 223 is fixed relative to the cylinder body of the plunger pump. The piston rod 221 abuts against the bottom surface of the ball seat of the spherical hinge bearing 3 at one end, and is arranged in the second piston sleeve 223 and axially reciprocates along the second piston sleeve 223 at the other end. The reset spring 222 is pre-pressed between the piston rod 221 and the second piston sleeve 223, and is configured to push the swash plate 1 back to the initial position after the external force acting on the adjusting rod 211 is removed.

[0080] Referring to Figure 4 When the external force acts on the adjusting rod 211, the swash plate 1 rotates, and the angle between the axis of the swash plate 1 and the rotation axis of the transmission shaft becomes smaller. At this time, for one end of the reset assembly 22, the swash plate 1 pushes the piston rod 221 to move towards the second piston sleeve 223 through the pull pin 4 and the spherical hinge bearing 3.

[0081] Since the second piston sleeve 223 is fixed relative to the cylinder body, the reset spring 222 arranged between the second piston sleeve and the piston rod 221 is under pressure. During this process, the reset spring 222 can not only cooperate with the pushing assembly 21 to position the swash plate 1, but also play a role in shock absorption and buffering during the variable process.

[0082] When the external force is removed, the one end of the adjusting rod 211 is no longer under stress. At this time, the elastic force of the reset spring 222 pushes the swash plate 1 to reverse through the piston rod 221, and finally the reset spring 222 returns to the natural state, while the swash plate 1 also returns to the initial position, realizing the automatic reset of the swash plate 1 and facilitating the user to adjust the inclination angle of the swash plate 1 next time.

[0083] In order to ensure the flexibility between the pull pin 4 and the swash plate 1, in an embodiment of the present disclosure, the swash plate 1 is provided with an oil supply channel 11 in the radial direction, which is configured to supply oil to the contact surface between the pull pin 4 and the swash plate 1.

[0084] In one embodiment of the present disclosure, the first piston 212 is sequentially provided with a first central hole 2121 and a second central hole 2122 in the axial direction, and the diameter of the first central hole 2121 is greater than that of the second central hole 2122.

[0085] As shown in the figure, during the movement of the first piston sleeve 213 pushed by the user through the adjusting rod 211, the first piston 212 arranged between the adjusting rod 211 and the first piston sleeve 213 will have a relative displacement with respect to the adjusting rod 211 and the first piston sleeve 213. Figure 3

[0086] In order to avoid excessive wear between the adjusting rod 211 and the first piston 212, the variable adjustment device provided by the present disclosure further provides the first piston 212 with a first central hole 2121 and a second central hole 2122. As mentioned above, the second central hole 2122 is responsible for positioning the adjusting rod 211, so that the axis of the adjusting rod 211 coincides with that of the first piston sleeve 213, so that the first piston sleeve 213 is reasonably stressed.

[0087] The diameter of the first central hole 2121 is greater than that of the second central hole 2122, that is, there is a gap between the first central hole 2121 and the adjusting rod 211. During the movement of the adjusting rod 211 with respect to the first piston sleeve 213, the oil liquid between the first central hole 2121 and the adjusting rod 211 can be brought by the adjusting rod 211 to the contact surface between the adjusting rod 211 and the first piston 212, thereby reducing friction and achieving lubrication.

[0088] In addition, in one embodiment of the present disclosure, the first piston 212 further comprises an oil supply hole 2123 arranged in the radial direction, and the oil supply hole 2123 is in communication with the first central hole 2121. During the movement of the first piston 212 with respect to the first piston sleeve 213, the oil supply hole 2123 introduces the oil liquid in the first central hole 2121 to the contact surface between the first piston 212 and the first piston sleeve 213, thereby lubricating the first piston 212 and the first piston sleeve 213.

[0089] In a second aspect, the present disclosure further provides a plunger variable pump, which comprises a pump body, a cylinder body, a plunger, and the variable adjustment device described above. The pump body has an oil inlet oil path and an oil outlet oil path; the cylinder body is provided with a plunger hole and is configured to rotate relative to the pump body under the action of a transmission shaft; the plunger is movably arranged in the plunger hole and is configured to reciprocate in the plunger hole under the action of the transmission shaft and the swash plate 1 to suck the medium from the oil inlet oil path into the plunger hole, compress the medium, and then discharge the medium from the oil outlet oil path.

[0090] Specifically, the plunger pump is provided with a transmission shaft, which rotates while driving the cylinder body to rotate around the transmission shaft, so that the plunger in the plunger hole of the cylinder body also rotates.​

[0091] At the same time, under the action of the swash plate 1 of the plunger pump, the plunger is forced to perform axial reciprocating movement along the plunger hole. In this process, the plunger in the plunger hole in communication with the oil inlet oil way gradually increases the chamber space between the plunger and the plunger hole during relative movement, so as to suck the medium from the oil inlet oil way of the plunger pump into the plunger hole.

[0092] Subsequently, the plunger and the cylinder body rotate with the driving, and when the plunger hole of the cylinder body is in communication with the oil outlet oil way of the plunger pump, the plunger moves relative to the plunger hole under the action of the swash plate 1. At this time, the chamber space between the plunger and the plunger hole decreases, the medium is extruded, and the medium is discharged from the plunger hole and finally discharged from the oil outlet oil way of the plunger pump.

[0093] In this process, the plunger pump can adjust the inclination angle of the swash plate 1 through the variable adjustment device, thereby changing the displacement of the plunger pump.

[0094] In a third aspect, the disclosure also provides a plunger variable motor, which comprises a pump body, a cylinder body, a plunger, and the above-mentioned variable adjustment device. The pump body has an oil inlet oil way and an oil outlet oil way; the cylinder body is provided with a plunger hole; the plunger is configured to perform axial reciprocating movement along the plunger hole under the action of the medium in the oil inlet oil way and the swash plate 1, and to drive the cylinder body to rotate together with the transmission shaft.

[0095] Specifically, after the plunger motor is started, the medium enters the plunger hole from the oil inlet oil way of the plunger motor, and pushes the plunger to move relative to the plunger hole. At the same time, under the action of the swash plate 1, the medium also pushes the plunger to rotate together with the plunger hole and the transmission shaft relative to the axis of the transmission shaft. When the plunger and the plunger hole rotate to a position where the plunger hole is in communication with the oil outlet oil way, the medium in the plunger hole is discharged from the oil outlet oil way.

[0096] In this process, the plunger pump can adjust the inclination angle of the swash plate 1 through the variable adjustment device, thereby changing the rotational speed of the transmission shaft of the plunger motor.

[0097] The above has described the embodiments of the disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical applications, or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein. The scope of the disclosure is defined by the appended claims.

Claims

1. A variable adjusting device applied to a piston variable pump or a piston variable motor, characterized by, The variable adjusting device comprises: A swash plate (1); An adjusting mechanism configured to adjust the angle between the axis of the swash plate (1) and the rotation axis of the transmission shaft, so as to adjust the stroke of the plunger; The pushing surface of the swash plate (1) is connected to one end of a pull pin (4) in a pluggable manner, the other end of the pull pin (4) is fixed to the inner ring of a spherical hinge bearing (3), the adjusting mechanism abuts against the bottom surface of the ball seat of the spherical hinge bearing (3), and acts on the swash plate (1) through the pull pin (4).

2. The variable adjustment device of claim 1, wherein, The pull pin (4) is provided with a limiting flange (41) in the circumferential direction, and the limiting flange (41) is configured to limit the depth of the pull pin (4) inserted into the swash plate (1).

3. The variable adjustment device of claim 1, wherein, The pull pin (4) is in interference fit with the inner ring of the spherical hinge bearing (3).

4. The variable adjustment device of claim 1, wherein The adjusting mechanism comprises a pushing assembly (21) and a resetting assembly (22), the pushing assembly (21) and the resetting assembly (22) are symmetrically installed with respect to the axis of the swash plate (1), and The pushing assembly (21) is configured to push the swash plate (1) to rotate under external force, so as to adjust the angle between the axis of the swash plate (1) and the rotation axis of the transmission shaft; The resetting assembly (22) is configured to push the swash plate (1) to reset after the external force acting on the pushing assembly (21) is removed.

5. The variable adjustment device of claim 4, wherein, The pushing assembly (21) comprises a first piston sleeve (213), a first piston (212), and an adjusting rod (211), The end surface of the first piston sleeve (213) abuts against the bottom surface of the ball seat of the spherical hinge bearing (3); The adjusting rod (211) is coaxially arranged with the first piston (212), is arranged inside the first piston sleeve (213), and reciprocates along the first piston sleeve (213) in the axial direction, and the adjusting rod (211) is configured to adjust the angle between the axis of the swash plate (1) and the rotation axis of the transmission shaft through the first piston sleeve (213) under external force.

6. The variable adjustment device of claim 5, wherein, The resetting assembly (22) comprises a piston rod (221), a resetting spring (222), and a second piston sleeve (223), The second piston sleeve (223) is fixed relative to the cylinder body of the plunger pump, one end of the piston rod (221) abuts against the bottom surface of the ball seat of the spherical hinge bearing (3), and the other end is arranged inside the second piston sleeve (223) and reciprocates along the second piston sleeve (223) in the axial direction; The resetting spring (222) is pre-pressed between the piston rod (221) and the second piston sleeve (223), and is configured to push the swash plate (1) to return to the initial position after the external force acting on the adjusting rod (211) is removed.

7. The variable adjustment device of claim 1, wherein The swash plate (1) is provided with an oil supply channel (11) in the radial direction, and the oil supply channel (11) is arranged to supply oil to the contact surface between the pull pin (4) and the swash plate (1).

8. The variable adjustment device of claim 5, wherein, The first piston (212) is sequentially provided with a first central hole (2121) and a second central hole (2122) in the axial direction, and the diameter of the first central hole (2121) is greater than that of the second central hole (2122).

9. The variable adjustment device of claim 8, wherein, The first piston (212) further comprises a radial oil supply hole (2123) in communication with the first central hole (2121).

10. A piston variable displacement pump characterized by comprising: The variable displacement pump comprises: a pump body having an oil inlet passage and an oil outlet passage; a cylinder body provided with a plunger hole and configured to rotate relative to the pump body under the action of a transmission shaft; a plunger movably arranged in the plunger hole and configured to reciprocate in the plunger hole under the action of the transmission shaft and a swash plate (1) to suck a medium from the oil inlet passage into the plunger hole, compress the medium, and then discharge the medium from the oil outlet passage; The variable displacement adjusting device of any one of claims 1 to 9.

11. A piston variable displacement motor characterized by, The variable displacement motor comprises: a pump body having an oil inlet passage and an oil outlet passage; a cylinder body provided with a plunger hole; a plunger configured to reciprocate along the plunger hole under the action of a medium in the oil inlet passage and a swash plate (1) and drive the cylinder body to rotate together with a transmission shaft; The variable displacement adjusting device of any one of claims 1 to 9.

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