Radial plunger type hydraulic motor and working machine

Abstract

The utility model provides a radial plunger type hydraulic motor and an operation machine, the radial plunger type hydraulic motor comprises a shell, a shaft part, a rod body and an axial limiting assembly, and the shaft part is arranged in the shell; the shaft part is arranged in the shell; the cylinder body is rotationally arranged on the radial outer side of the shaft part; the axial limiting assembly is arranged between the shell and the shaft part so as to conduct bidirectional limiting on the shaft part in the axial direction. When the radial plunger type hydraulic motor works, the positioning precision of the shaft part can be improved, the shaft part is prevented from shaking or slightly displacing, the torque output capacity of the radial plunger type hydraulic motor is improved, abrasion to the shaft part is reduced, and the service life of the radial plunger type hydraulic motor is prolonged.

Description

Technical Field

[0001] The present application relates to the field of hydraulic technology, and in particular to a radial piston hydraulic motor and an operating machine. Background Art

[0002] A hydraulic motor is a device that can convert liquid pressure energy into mechanical energy. As a type of hydraulic motor, radial piston hydraulic motors often appear in application scenarios that require high torque output. The reliability of radial piston hydraulic motors is affected by many factors. For example, radial piston hydraulic motors usually only have structures such as splines to achieve circumferential limit on the shaft. When the radial piston motor is used for a long time, the shaft may shake or slightly displace, resulting in a deterioration in the torque output capacity of the radial piston hydraulic motor, and wear and tear that affects the service life of the radial piston hydraulic motor. Utility Model Content

[0003] In view of this, the present application provides a radial piston hydraulic motor to solve the problem that the radial piston motor has poor axial positioning effect and the shaft is prone to wear. The present application also provides a working machine including the above radial piston motor.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A radial piston hydraulic motor, comprising:

[0006] case;

[0007] A shaft portion, disposed in the housing;

[0008] a cylinder body, rotatably disposed radially outside the shaft portion;

[0009] An axial limiting assembly is arranged between the housing and the shaft portion to limit the shaft portion in two directions in the axial direction.

[0010] Optionally, the shell and the shaft are respectively provided with a first step surface and a second step surface, and the axial limit assembly includes a support member and a first limit member and a second limit member respectively fixed to the shell and the shaft, and the support member is axially arranged in a space enclosed by the first step surface, the second step surface, the first limit member and the second limit member.

[0011] Optionally, the first step surface and the second step surface are aligned in the axial direction.

[0012] Optionally, the first limiting member and the second limiting member are retaining rings clamped in grooves of the housing and the shaft.

[0013] Optionally, the shaft portion is provided with an external spline portion, and the housing is provided with an internal spline portion, and the external spline portion and the internal spline portion are meshed to fix the shaft portion relative to the housing in the circumferential direction.

[0014] The first step surface and the second step surface are provided at ends of the outer spline portion and the inner spline portion.

[0015] Optionally, in the axial direction of the shaft portion, the first limiting member and the second limiting member are staggered.

[0016] Optional, including:

[0017] a brake disc, the brake disc comprising brake pads circumferentially fixed to the cylinder body and the shaft portion respectively;

[0018] A force-applying component applies a pressing force to the brake disc, wherein the force-applying component includes a brake piston and a disc spring, and the brake piston moves toward the disc spring under the pressure in the brake hydraulic chamber.

[0019] Optionally, the axial limit assembly includes a seal, and the brake hydraulic chamber is partially sealed by the axial limit assembly.

[0020] Optionally, the shaft portion is centered relative to the cylinder body by a positioning assembly, and the positioning assembly is arranged on a side of the brake disc opposite to the force application assembly.

[0021] Optionally, the positioning assembly includes a third limit member arranged on the cylinder body, a second support member axially arranged between the third limit member and the brake disc, and a centering ring radially arranged between the second support member and the shaft portion.

[0022] Optionally, the cylinder body is equipped with a plurality of plungers to rotate under the guidance of a guide surface provided on the housing, and the cylinder body is configured to be connected to an external device to output torque.

[0023] A working machine comprises the radial piston hydraulic motor described in any one of the above items.

[0024] The radial piston hydraulic motor provided by the present application realizes bidirectional limiting of the shaft in the axial direction by setting an axial limiting assembly between the housing and the shaft. In this way, the circumferential limiting of the shaft is realized by the spline structure in the circumferential direction, and the bidirectional limiting of the shaft in the axial direction is realized by the axial limiting assembly, which can improve the positioning accuracy of the shaft when the radial piston hydraulic motor is working, avoid shaking or slight displacement of the shaft, improve the torque output capacity of the radial piston hydraulic motor, reduce the wear of the shaft, and increase the service life of the radial piston hydraulic motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1 It is a cross-sectional view of a radial piston hydraulic motor along the axis center position of the shaft;

[0027] Figure 2 for Figure 1 Magnified view of the area marked by the middle dashed line A. DETAILED DESCRIPTION

[0028] The present application provides a radial piston hydraulic motor and also provides a working machine including the radial piston hydraulic motor.

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a radial piston hydraulic motor, which is a device that converts hydraulic energy into mechanical energy. The hydraulic system delivers hydraulic oil to the radial piston hydraulic motor, pushes the piston 101 to move, and makes the power output end of the motor output power. The radial piston hydraulic motor can be installed in an operating machine and can output power to the operating machine so that the operating machine completes mechanical movement. The radial piston hydraulic motor mainly includes a housing 4, a cylinder 1, a shaft 2, a bearing 5 and a brake device 3. Among them, the cylinder 1 is arranged on the inner side of the housing 4, and the shaft 2 extends into and passes through the cylinder 1 in the axial direction. When the radial piston hydraulic motor is working, the cylinder 1 rotates relative to the housing 4 and the shaft 2, and the housing 4 and the shaft 2 are fixed. The cylinder 1 is the power output end of the radial piston hydraulic motor; the bearing 5 is arranged between the housing 4 and the cylinder 1 to realize the rotation of the cylinder 1 relative to the housing 4; the brake device 3 is partially arranged between the cylinder 1 and the shaft 2 to realize the braking of the cylinder 1.

[0031] In some embodiments, the shaft portion 2 is a hollow shaft, and the shaft-shaped portion of other equipment can pass through the middle of the hollow shaft to facilitate the arrangement of other equipment, thereby reducing the floor space of the equipment and making the overall layout of other equipment and the radial piston hydraulic motor more compact. In addition, the shaft portion 2 can also be a solid shaft.

[0032] Specifically, the inner side surface of the housing 4 is provided with a cam surface 403 that cooperates with the plunger 101 of the cylinder body 1, and the plunger 101 is provided in the cylinder body 1 to radially reciprocate in the working chamber 102 under the guidance of the cam surface 403. When the radial piston hydraulic motor is working, the high-pressure hydraulic oil enters the working chamber 102 through the oil inlet and the distribution plate 12 of the radial piston hydraulic motor. The hydraulic oil entering the working chamber will push the plunger 101 to move in the working chamber, and the top of the plunger 101 contacts the cam surface 403 (usually the plunger 101 includes a roller, and the roller contacts the cam surface 403), so that the cylinder body 1 will rotate relative to the cam surface 403. The cylinder body 1 is provided with a power output part connected to an external mechanism, such as a spline or a bolt hole, as a power output part of the radial piston hydraulic motor.

[0033] In some embodiments, the housing 4 mainly includes a front housing 401 provided with a cam surface 403 and a rear housing 402 accommodating a port plate 12, and an opening of the rear housing 402 on the opposite side of the front housing 401 is closed by an end cover 16. It can be understood that the above structure is only schematic, and the utility model can be applied to all applicable radial piston hydraulic motors. For example, some radial piston hydraulic motors do not include an end cover 16, or the cam surface 403 is provided on a separate housing part, which all fall within the protection scope of the utility model.

[0034] In the exemplary embodiment of the utility model, at least part of the cylinder body 1 is arranged in the front housing 401, and the working chamber 102 of the cylinder body 1 accommodating the plunger 101 is matched with the cam surface 403 arranged on the inner side of the front housing 401, and the working chamber 102 is located in the area where the front housing 401 is located; the rear housing 402 accommodates the distribution plate 12 matched with the oil inlet and oil outlet of the cylinder body 1, and the distribution plate 12 is positioned by the positioning pin 13, so as to realize the relative rotation of the cylinder body 1 relative to the distribution plate 12, realize the delivery of high-pressure hydraulic oil to the working chamber 102, and output of low-pressure hydraulic oil from the working chamber 102. The force application assembly 301 of the brake device 3 is also accommodated in the rear housing 402, which will be described in detail below.

[0035] In some embodiments, the brake device 3 includes a brake disc 302 and a force-applying assembly 301 for applying force to the brake disc 302. The brake disc 302 is disposed between the shaft portion 2 and the cylinder body 1, and is at least partially disposed on the radial inner side of the plunger 101. The brake disc 302 includes a plurality of dynamic brake pads 3021 and a plurality of static brake pads 3022, and the plurality of dynamic brake pads 3021 rotate synchronously with the rotation of the cylinder body 1 when the cylinder body 1 rotates, and the plurality of static brake pads 3022 are disposed on the shaft portion 2 in the rotation direction. In this way, when it is necessary to brake the rotating cylinder body 1, the force-applying assembly 301 is used to apply thrust to the static brake pads 3022, so that the plurality of static brake pads 3022 are respectively in contact with the plurality of dynamic brake pads 3021, so that a braking force is applied to the dynamic brake pads 3021 connected to the cylinder body 1, thereby achieving the effect of braking the rotating cylinder body 1.

[0036] Furthermore, the force-applying assembly 301 includes a brake piston 3012, a disc spring 3013 and a brake pin 3011 arranged on the radial inner side of the rear housing 402, wherein the disc spring 3013 applies a force toward the brake disc 302 to the brake piston 3012 to press the brake disc 302; the brake piston 3012 has a force-bearing surface that bears hydraulic pressure, and the force-bearing surface is exposed to the brake hydraulic chamber 40221. When there is brake hydraulic pressure in the brake hydraulic chamber, the brake hydraulic pressure overcomes the force of the disc spring 3013 and pushes the brake piston 3012 to move away from the brake disc 302 to release the brake disc 302; the brake pin 3011 is connected to the brake piston 3012 and passes through the rear housing 402, and can transmit force between the brake disc 302 and the brake piston 3012. It can be understood that in different arrangements, the brake pin 3011 may not be provided, and the brake disc 302 may be directly pressed by the brake piston 3012.

[0037] The shaft portion 2 can be circumferentially connected to the housing 4 through a spline. Specifically, the housing 4 is provided with an internal spline portion 17, which is arranged radially inward of the rear housing 402 in this embodiment. The shaft portion is provided with an external spline portion 8, a portion of which is engaged with the internal spline portion 17 of the housing 4, and the other portion is engaged with the brake pad of the brake disc 302. When the cylinder body 1 rotates and outputs power to the outside, in order to prevent the shaft portion 2 from axially moving, an axial limiting assembly 9 is arranged between the housing 4 and the shaft portion 2. The axial limiting assembly 9 is arranged between the housing 4 and the shaft portion 2 to achieve bidirectional limiting of the shaft portion 2 in the axial direction. In this way, the circumferential limitation of the shaft 2 is achieved in the circumferential direction through the spline structure, and the bidirectional axial limitation of the shaft 2 is achieved through the axial limiting assembly 9. This can improve the positioning accuracy of the shaft 2 when the radial piston hydraulic motor is working, avoid shaking or slight displacement of the shaft 2, enhance the torque output capacity of the radial piston hydraulic motor, reduce the wear on the shaft 2, and increase the service life of the radial piston hydraulic motor.

[0038] In some embodiments, please refer to Figure 2 The housing 4 and the shaft 2 are respectively provided with a first step surface 404 and a second step surface 201. The axial limiting assembly 9 includes a first support member 901 and a first limiting member 902 and a second limiting member 903 respectively fixed to the housing 4 and the shaft 2. The first support member 901 is axially arranged in a space surrounded by the first step surface 404, the second step surface 201, the first limiting member 902 and the second limiting member 903. Specifically, the first step surface 404 and the second step surface 201 are both arranged on the left side of the first support member 901, and the first limiting member 902 and the second limiting member 903 are both arranged on the right side of the first support member 901. The upper part of the first support member 901 is clamped between the first step surface 404 and the first limiting member 902, and the lower part is clamped between the second step surface 201 and the second limiting member 903, so as to limit the shaft 2 from moving leftward and rightward relative to the housing 4.

[0039] It should be noted that the first limit member 902 and the second limit member 903 are both annular limit members, such as retaining rings, which are clamped in the corresponding annular grooves on the shell 4 and the shaft portion 2, so as to be detachably connected to the shell 4 and the shaft portion 2; the corresponding first support member 901 is an annular support member; the first step surface 404 and the second step surface 201 are annular step surfaces. With such an arrangement, the axial limit assembly 9 composed of the above structure can achieve axial limitation of the shaft portion 2 at various circumferential positions to ensure the stability of the axial limitation.

[0040] It can be understood that these are all exemplary, and those skilled in the art can freely combine the step surfaces and the limit members, for example, both sides of the first support member 901 are limited by the limit members, or the right side is limited by the step surface and the left side is limited by the limit member, or the left side of the shaft is the limit member and the right side is the step surface, while the left side of the shell is the step surface and the right side is the limit member, all of which are within the protection scope of the present utility model.

[0041] “The axial limiting assembly is arranged between the shell 4 and the shaft portion 2” does not mean that the first support member 901 must be directly fixed to the shell 4 and the shaft portion 2. For example, other components may be arranged on the shell 4, which are referred to as intermediate components herein. The step and the limiting component are arranged on the intermediate component. The first support member 901 is indirectly fixed to the shell 4 through the intermediate component, and the axial limiting of the shaft portion 2 relative to the shell 4 is realized. All of these are within the scope of the present invention.

[0042] In addition, the first support member 901 , the first step surface 404 , the second step surface 201 , the first position-limiting member 902 and the second position-limiting member 903 may also be arc-shaped structures arranged in the circumferential direction.

[0043] Furthermore, the first step surface 404 and the second step surface 201 are aligned in the axial direction, so that the left side of the first support member 901 can be an annular plane without the need to set a step surface, which facilitates processing and assembly.

[0044] Further, the first step surface 404 and the second step surface 201 are arranged at the ends of the outer spline portion 8 and the inner spline portion 23. Such arrangement can facilitate the arrangement of the first step surface 404 and the second step surface 201, reduce the process of slotting the shaft portion 2 and the housing 4, and improve the processing efficiency of the first step surface 404 and the second step surface 201; and can facilitate the installation of the first support member 901, and improve the installation efficiency of the axial limit assembly 9.

[0045] Furthermore, in some embodiments, in the axial direction of the shaft portion 2, the first stopper 902 and the second stopper 903 are staggered. Accordingly, a step surface is provided on the right side of the first support member 901 to match the positions of the first stopper 902 and the second stopper 903. Specifically, when installing the radial piston hydraulic motor, since the first stopper 902 and the second stopper 903 are staggered, the installation of the first support member 901 can be further realized, and the installation efficiency of the axial positioning assembly 9 can be further improved.

[0046] The radial piston hydraulic motor of the above structure limits the rotation and axial movement of the shaft 2 when the cylinder body 1 rotates to output power, thereby avoiding the possibility of failure of the seal due to the synchronous rotation of the shaft 2 and the cylinder body 1. The circumferential and axial limitations of the shaft 2 are achieved by providing an external spline portion 8, an internal spline portion 23 and an axial limit assembly 9, thereby improving the airtightness between the cylinder body 1 and the shaft 2 when the cylinder body 1 rotates, and ensuring the normal functions of components such as the shaft seal structure, friction plate, and dust ring.

[0047] In this embodiment, the axial stopper assembly 9 is further provided with a second seal 11 and a first seal 10 located at the outer periphery and the inner periphery of the first support member 901, and the brake hydraulic chamber is partially sealed by the axial stopper assembly 9 to prevent the brake hydraulic pressure in the brake hydraulic chamber 40221 from leaking and affecting the braking effect. Specifically, the brake hydraulic chamber 40221 is surrounded by the brake piston 3012 and its seal, the rear housing 402, the brake pin 3011 and its seal, the axial stopper assembly 9, and the shaft portion 2.

[0048] The axial limiting assembly 9 is arranged on the side of the shaft 2 close to the force-applying assembly 3. In order to center the shaft 2 relative to the cylinder body 1 and avoid misalignment and shaking of the shaft 2, a positioning assembly 18 is arranged at the end of the shaft 2 away from the force-applying assembly 3.

[0049] Specifically, the positioning assembly includes a second support member 6 disposed between the shaft portion 2 and the cylinder body 1, one axial side (the left side in the figure) of the second support member 6 is fixed to the cylinder body 1 through a snap ring 15, and the other side abuts against the brake disc 302. The snap ring 15 is a third stopper, fixed in the inner groove of the cylinder body, which can prevent the second support member 6 and the brake disc 2 from moving leftward in the axial direction.

[0050] The positioning assembly 18 may also include a centering ring 1801. For example, the centering ring 1801 may be a gray ring, so as to have both centering and sealing functions. The centering ring 1801 may be supported by the second support member 6. For example, the inner circumference of the second support member 6 is provided with an annular groove, and the centering ring 1801 may be placed in the annular groove, so as to be radially arranged between the second support member 6 and the shaft portion 2. The centering ring 1801 can ensure that the axis of the shaft portion 2 is roughly coincident with the axis of the second support member 6 (and then with the cylinder body 1 and the housing 4), and guide any slight movement of the shaft portion 2 to avoid problems such as affecting the sealing performance, generating noise, and reducing efficiency due to deflection and shaking.

[0051] In addition, the positioning assembly 18 may also include a plurality of seals ( 1802 is one of them), which will not be described in detail here.

[0052] The utility model also relates to an operating machine including the radial piston motor. Since the operating machine includes the radial piston hydraulic motor, the beneficial effects of the operating machine brought by the radial piston hydraulic motor can be seen in the above content, which will not be repeated here.

[0053] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0054] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0055] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0056] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0057] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0058] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A radial piston hydraulic motor, characterized in that: include: case; A shaft portion, disposed in the housing; a cylinder body, rotatably disposed radially outside the shaft portion; An axial limiting assembly is arranged between the housing and the shaft portion to limit the shaft portion in two directions in the axial direction.

2. The radial piston hydraulic motor according to claim 1, characterized in that: The shell and the shaft are respectively provided with a first step surface and a second step surface, the axial limit assembly includes a first support member and a first limit member and a second limit member respectively fixed to the shell and the shaft, and the first support member is axially arranged in a space surrounded by the first step surface, the second step surface, the first limit member and the second limit member.

3. The radial piston hydraulic motor according to claim 2, characterized in that: The first step surface and the second step surface are aligned in the axial direction.

4. The radial piston hydraulic motor according to claim 2, characterized in that: The first limiting member and the second limiting member are clamping rings clamped in the grooves of the housing and the shaft.

5. The radial piston hydraulic motor according to claim 2, characterized in that: The shaft portion is provided with an external spline portion, and the housing is provided with an internal spline portion, the external spline portion and the internal spline portion are meshed to fix the shaft portion relative to the housing in the circumferential direction, and the first step surface and the second step surface are provided at the ends of the external spline portion and the internal spline portion.

6. The radial piston hydraulic motor according to claim 2, characterized in that: In the axial direction of the shaft portion, the first limiting member and the second limiting member are staggered.

7. The radial piston hydraulic motor according to claim 1, characterized in that: include: a brake disc, the brake disc comprising brake pads circumferentially fixed to the cylinder body and the shaft portion respectively; A force-applying component applies a pressing force to the brake disc, wherein the force-applying component includes a brake piston and a disc spring, and the brake piston moves toward the disc spring under the pressure in the brake hydraulic chamber.

8. The radial piston hydraulic motor according to claim 7, characterized in that: The axial limit assembly includes a sealing member, and the brake hydraulic chamber is partially sealed by the axial limit assembly.

9. The radial piston hydraulic motor according to claim 7, characterized in that: The shaft portion is centered relative to the cylinder body by a positioning assembly, and the positioning assembly is disposed on a side of the brake disc opposite to the force application assembly.

10. The radial piston hydraulic motor according to claim 9, characterized in that: The positioning assembly includes a third stopper arranged on the cylinder body, a second support member axially arranged between the third stopper and the brake disc, and a centering ring radially arranged between the second support member and the shaft portion.

11. The radial piston hydraulic motor according to claim 1, characterized in that: The cylinder body is provided with a plurality of plungers to rotate under the guidance of a guide surface provided on the housing, and the cylinder body is configured to be coupled to an external device to output torque.

12. A working machine, characterized in that: It comprises a radial piston hydraulic motor as described in any one of claims 1 to 11.

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