Radial plunger type hydraulic motor and working machine

Abstract

The utility model provides a radial plunger type hydraulic motor and an operating machine, the radial plunger type hydraulic motor comprises a shell, a cam surface and a cylinder body, the cylinder body is rotatably arranged on the inner side of the cam surface and is provided with a plunger which is guided by the cam surface to do radial reciprocating motion, and the cylinder body is a power output part of the radial plunger type hydraulic motor; the hollow shaft extends into the cylinder body; and a multi-piece brake disc for braking the cylinder body is arranged between the cylinder body and the hollow shaft. The radial plunger type hydraulic motor can be connected with other devices in series, and meanwhile the compact appearance is kept.

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] The radial piston hydraulic motor is a device that converts hydraulic energy into mechanical energy. It can be widely used in the travel and drive systems of engineering machinery (road rollers, skid loaders, loaders, forklifts), mining (tunneling machines), geology, military industry, ships, and agricultural machinery. Due to the limited installation space, there has always been a demand for smaller radial piston hydraulic motors in the industry.

[0003] In radial piston hydraulic motors, usually the radial piston hydraulic motor outputs power through a hollow shaft, but in some cases, such as for a road roller, it is desired to connect the radial piston hydraulic motor used for traveling and the vibration motor used for vibration in series, and the two occupy a large space. Therefore, a radial piston motor that can be connected in series with other equipment while maintaining a compact shape is required. Utility Model Content

[0004] In view of this, the present application provides a radial piston hydraulic motor, which solves the problem of low power output efficiency and large space occupation of the radial piston hydraulic motor. The present application also provides a working machine including the radial piston hydraulic motor.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A radial piston hydraulic motor, comprising:

[0007] case;

[0008] Cam surface;

[0009] A cylinder body, rotatably disposed on the inner side of the cam surface, and provided with a plunger that moves radially back and forth under the guidance of the cam surface, the cylinder body being a power output member of the radial piston hydraulic motor;

[0010] A hollow shaft extending into the cylinder body;

[0011] Wherein, a multi-plate brake disc for braking the cylinder body is arranged between the cylinder body and the hollow shaft.

[0012] Optionally, the hollow shaft is fixed to the housing and is completely contained in the housing, and the radial piston hydraulic motor allows a shaft portion of other equipment to pass through the hollow shaft.

[0013] Optionally, the cam surface is integrally provided on the housing.

[0014] Optionally, the radial piston hydraulic motor includes a bearing arranged between the housing and the cylinder body, the cylinder body includes a radial protrusion for accommodating the piston, and the bearing includes a first bearing and a second bearing respectively arranged closely on the front side and the rear side of the radial protrusion.

[0015] Optionally, the housing of the radial piston hydraulic motor includes a front housing on which the cam surface is disposed and a rear housing for accommodating a distribution plate, and the rear housing positions the distribution plate via a locating pin.

[0016] Optionally, a flange for fixing the radial piston hydraulic motor to an external device is integrally provided on the outer side of the front housing, and the flange at least partially overlaps with the piston in the axial direction.

[0017] Optionally, the rear housing includes:

[0018] A first accommodating chamber, accommodating the distribution plate;

[0019] A second accommodating chamber, accommodating a force-applying component for applying force to the brake disc;

[0020] The limiting portion is used to limit the rotation of the hollow shaft and limit the bidirectional movement of the hollow shaft in the axial direction.

[0021] Optional,

[0022] The brake disc comprises: a plurality of dynamic brake pads connected to the cylinder body in the rotation direction, and a plurality of static brake pads connected to the hollow shaft in the rotation direction;

[0023] The force-applying assembly includes: a brake pin, which passes through the rear housing and can axially tighten and loosen the brake disc; a brake piston, which is connected to the brake pin and has a force-bearing surface that withstands hydraulic pressure, and when the force-bearing surface is subjected to hydraulic pressure, the brake piston drives the brake pin to move away from the brake disc; a disc spring, which abuts against the brake piston and can push the brake piston and the brake pin toward the brake disc when the force-bearing surface is not subjected to hydraulic pressure.

[0024] Optionally, it further includes a centering ring arranged between the hollow shaft and the cylinder body, and a sealing ring is arranged between the centering ring and the hollow shaft, and the centering ring and the limiting portion are located at two axial ends of the hollow shaft.

[0025] Optionally, the front shell includes a necked portion for connecting to the rear shell, the rear shell is provided with a flared portion sleeved on the outside of the necked portion, and a connecting piece connecting the front shell and the rear shell axially passes through the flared portion and the necked portion.

[0026] Optionally, the connecting member extends through the radially outer side of the cam surface.

[0027] A working machine comprises the radial piston hydraulic motor described in any one of the above items.

[0028] The radial piston hydraulic motor provided by the present application has a cam surface arranged on a housing, a cylinder body rotatably arranged on the inner side of the cam surface, a piston which radially reciprocates under the guidance of the cam surface is arranged on the cylinder body, and high-pressure hydraulic oil flows into the plunger hole through a distribution plate to realize the rotation of the cylinder body. In this way, the cylinder body is a power output part of the radial piston hydraulic motor. Compared with a radial piston hydraulic motor which outputs power from a shaft, the power output efficiency of the present application is high, and the sealing difficulty of the radial piston hydraulic motor is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 A cross-sectional view of a radial piston hydraulic motor provided in this embodiment along the axial center of the shaft;

[0031] Figure 2 A cross-sectional view of a radial piston hydraulic motor along the axial center of a shaft in another embodiment;

[0032] Figure 3 This is a cross-sectional view of a radial piston hydraulic motor along the axial center of a shaft in yet another embodiment. DETAILED DESCRIPTION

[0033] The present application provides a radial piston hydraulic motor and also provides a working machine including the radial piston hydraulic motor.

[0034] 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.

[0035] like Figure 1-Figure 3As shown, the embodiment of the present application provides a radial piston hydraulic motor, which is a device that converts hydraulic energy into mechanical energy. It can be installed in an operating machine and can output power to the operating machine so that the operating machine can complete mechanical movement. The radial piston hydraulic motor mainly includes a housing 4, a cylinder body 1, a hollow shaft 2, a bearing 5 and a braking device 3. Among them, the cylinder body 1 is arranged on the inner side of the housing 4, the hollow shaft 2 is fixed to the housing 4, and extends into the cylinder body 1 in the axial direction. When the radial piston hydraulic motor is working, the cylinder body 1 rotates relative to the housing 4 and the hollow shaft 2; the bearing 5 is arranged between the housing 4 and the cylinder body 1 to realize the rotation of the cylinder body 1 relative to the housing 4; a multi-piece brake disc 302 is arranged between the cylinder body 1 and the hollow shaft 2 to realize the braking of the cylinder body 1.

[0036] Specifically, a cam surface 403 is provided on the inner side of the housing 4, and a plunger 101 is provided in the cylinder body 1. The plunger 101 moves radially back and forth in the working chamber 102 under the guidance of the cam surface 403. When the radial piston hydraulic motor is working, 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. A power output part connected to an external mechanism, such as a spline or a bolt hole, is provided on the cylinder body 1 as a power output part of the radial piston hydraulic motor.

[0037] 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 a rear end cover 16 (the rear end cover 16 may be hollow or solid). 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 a rear 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.

[0038] In the exemplary embodiment of the present 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 adapted to be arranged 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. Two bearings 5 ​​are arranged between the housing 4 and the cylinder body 1 on both sides of the working chamber 102. Specifically, the working chamber 102 is formed by the radial protrusion of the cylinder body, and on the front side of the radial protrusion, the first bearing 501 is abutted between the wall surface of the front housing 401 and the radial protrusion; on the rear side of the radial protrusion, the second bearing 502 is abutted between the radial protrusion and the wall surface of the rear housing 402. In this way, when the cylinder body 1 rotates relative to the housing 4, the stability of the cylinder body 1 during rotation is ensured, and the power output by the cylinder body 1 is more stable.

[0039] A flange is integrally provided on the circumferential outer side of the front housing 401, and the flange is used to fix the hydraulic motor to an external device, such as a hydraulic machine, and the flange at least partially overlaps with the plunger in the axial direction, that is, the flange is located radially outside the plunger. Since there is relative motion between the plunger and the cam surface 403, and this is the part where the hydraulic motor is subjected to the greatest force, arranging the flange at this position can enhance the strength of the front housing 401 and reduce the vibration and noise of the motor.

[0040] Further, a constricted portion 4011 is provided on the front housing 401, and a flared portion 4023 is provided on the rear housing 402, and the flared portion 4023 is provided on the circumferential outer side of the constricted portion 4011, the constricted portion 4011 and the flared portion 4023 cooperate, and the connection between the front housing 401 and the rear housing 402 is realized through the connecting piece 14. Exemplarily, the connecting piece 14 is usually a connecting screw, and the connecting piece 14 passes through the position where the constricted portion 4011 and the flared portion 4023 are located in the axial direction. Since the rear housing 402 partially wraps the front housing 401, and the connecting piece 14 passes through the position corresponding to the working chamber 102 in the axial direction, the strength of the front housing 401 can be improved to reduce the radial size of the front housing 401 and even the housing 4 as a whole. And since the front housing 401 can be set to be thinner, for motors with the same external dimensions, the through-hole diameter of the hollow shaft 2 can be increased.

[0041] Furthermore, the rear housing 402 includes a first accommodating chamber 4021, a second accommodating chamber 4022 and a limiting portion, wherein the first accommodating chamber 4021 is used to accommodate the distributor 12, the fluid channel in the distributor 12 is connected to the oil inlet and the oil outlet of the cylinder body 1, and the distributor 12 is fixed to the rear housing 402 by the positioning pin 13, so as to realize the relative rotation of the cylinder body 1 relative to the distributor 12, realize the delivery of high-pressure hydraulic oil to the working chamber 102, and realize the output of low-pressure hydraulic oil from the working chamber 102. One end of the positioning pin is arranged at the rear end of the distributor 12, and the other end is arranged at the front end of the radial extension portion of the rear housing (i.e., the partition between the first accommodating chamber 4021 and the second accommodating chamber 4022). By setting the housing 4 as described above, the structure of the radial piston hydraulic motor is made compact, and the overall volume of the radial piston hydraulic motor is reduced. In addition, the positioning pin 13 can be used to easily and accurately realize the positioning of the distributor 12.

[0042] The second accommodating chamber 4022 is used to accommodate the force-applying assembly 301 . The force-applying assembly 301 is a component that applies braking force to the brake disc 302 . The brake disc 302 and the force-applying assembly 301 together constitute the braking device 3 .

[0043] The brake disc 302 is radially arranged between the hollow shaft 2 and the cylinder body 1, and at least partially arranged on the radial inner side of the piston 101. This facilitates the arrangement of the brake disc 302 and makes the overall structure of the radial piston hydraulic motor more compact. Setting the brake disc 302 between the hollow shaft 2 and the cylinder body 1 can also efficiently achieve braking of the cylinder body 1.

[0044] Furthermore, 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 cylinder body 1 when the cylinder body 1 rotates, and the plurality of static brake pads 3022 are arranged on the hollow shaft 2 in the rotation direction. In this way, when it is necessary to brake the rotating cylinder body 1, the force-applying component 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, thereby applying braking force to the dynamic brake pads 3021 connected to the cylinder body 1, thereby achieving the effect of braking the rotating cylinder body 1.

[0045] 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.

[0046] The rear housing 402 further includes a stopper to limit the rotation of the hollow shaft 2 and to limit the bidirectional movement of the hollow shaft 2 in the axial direction. Specifically, the stopper includes an internal spline 23 to engage with the external spline 8 of the hollow shaft 2, thereby limiting the circumferential movement of the hollow shaft 2. The external spline 8 of the hollow shaft 2 can also partially engage with the static brake pad 3022 of the brake disc 302.

[0047] The limiting part of the rear housing 402 also includes an axial limiting assembly 9 disposed between the rear housing 402 and the hollow shaft 2, so as to realize bidirectional limiting of the hollow shaft 2 in the axial direction. In this way, the circumferential limiting of the hollow shaft 2 is realized by the spline structure in the circumferential direction, and the bidirectional limiting of the hollow shaft 2 in the axial direction is realized by the axial limiting assembly 9, which can improve the positioning accuracy of the hollow shaft 2 when the radial piston hydraulic motor is working, avoid shaking or slight displacement of the hollow shaft 2, improve the torque output capacity of the radial piston hydraulic motor, reduce the wear of the hollow shaft 2, and increase the service life of the radial piston hydraulic motor.

[0048] In some embodiments, please refer to Figure 2The housing 4 and the hollow shaft 2 are respectively provided with a first step surface 404 and a second step surface 201. The axial limit assembly 9 includes a first support member 901 and a first limit member 902 and a second limit member 903 respectively fixed to the housing 4 and the hollow 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 limit member 902 and the second limit 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 limit member 902 and the second limit 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 limit member 902, and the lower part is clamped between the second step surface 201 and the second limit member 903, so as to limit the leftward and rightward movement of the hollow shaft 2 relative to the housing 4.

[0049] It should be noted that the first limit member 902 and the second limit member 903 are, for example, retaining rings, which are clamped in the corresponding annular grooves on the shell 4 and the hollow shaft 2, so as to be detachably connected to the shell 4 and the hollow shaft 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 hollow shaft 2 at various circumferential positions to ensure the stability of the axial limitation.

[0050] It can be understood that the structure of the above-mentioned axial limit assembly 9 is only an example, and it can have various modifications. For example, any combination of limit members and step surfaces can be used on both sides of the first support member 901, or all limit members or all step surfaces can be used. Any part of the axial limit assembly 9 can be integrally arranged with the hollow shaft 2 or the rear housing 402, and the parts of the axial limit assembly 9 can also be a non-annular structure, but a structure that is discontinuous in the circumferential direction. These are all within the scope of the present invention.

[0051] In some embodiments, the hollow shaft 2 is fixed in the housing 4, that is, when the cylinder body 1 rotates to output the power of the radial piston hydraulic motor, the hollow shaft 2 does not move, wherein the hollow shaft 2 is completely contained in the housing 4, and the shaft-like portion of other equipment can pass through the middle of the hollow shaft 2. As can be seen from the above, when the cylinder body 1 outputs power, the hollow shaft 2 is fixed, so that the shaft-like portion of other equipment passes through the middle of the hollow shaft 2 and does not affect the arrangement and setting of the radial piston hydraulic motor, and does not affect the power output of the radial piston hydraulic motor. The shaft-like portion of the equipment passes through the hollow shaft 2, which can also 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. Exemplarily, other equipment with a shaft-like portion can be a pump, a motor, an engine, a motor or a fan, etc.

[0052] It can be understood that the hollow shaft 2 does not necessarily mean that the hydraulic motor allows the shaft of other equipment to pass through the hollow shaft 2. The hydraulic motor can be provided with a cover on one or both sides of the axial direction to prevent the interior of the hollow shaft 2 from being exposed to the outside. Figure 2 The radial piston hydraulic motor may include a rear end cover 16 and a front end cover 17, wherein the rear end cover 16 is solid, that is, no through hole corresponding to the hollow shaft 2 is provided; and the front end cover 17 closes the front end of the housing 4. In this way, dust can be prevented from entering the interior of the hydraulic motor when other equipment is not required to be connected in series.

[0053] Figure 3 Another hydraulic motor is shown. Figure 2 The hydraulic motor shown is substantially the same and also has a front cover 17. The main difference is that the front cover 17 not only plays a sealing role, but also plays a role in transmitting torque. It is also because of the difference in function that the front cover 17 can be thicker. The following is an example of a hydraulic motor.

[0054] refer to Figure 3 The radial piston hydraulic motor may include an internal fastener 18, the cylinder body 1 is provided with a plurality of second connection holes 104, the front end cover 17 is provided with a plurality of third connection holes 1702, and each internal fastener 18 penetrates a corresponding second connection hole 104 and a corresponding third connection hole 1702 to combine the front end cover 17 and the cylinder body 1. After the hydraulic motor is installed in the application scenario, the external fastener is a torque input member that passes through the front end cover through hole 1701 and extends into the first connection hole 103 to connect the cylinder body 1 to the external device, and, under the action of the external fastener, the front end face of the front end cover 17 will be pressed against the rear end face of the torque input member of the external device to transmit torque through the friction between the two.

[0055] In this way, during the torque transmission process, part of the torque is transmitted through the friction between the two end faces, thereby reducing the stress on the external fasteners, which is conducive to reducing the risk of accidental damage to the external fasteners. The "cylinder body 1 is the power output part of the radial piston hydraulic motor" in the utility model also covers this situation, because all the torque is still output by the cylinder body 1, but part of the torque is transmitted through the front cover 17.

[0056] 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.

[0057] 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.

[0058] The components and devices 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 drawings. As will be appreciated by those skilled in the art, these components and devices can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, meaning "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 word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0059] It should also be noted that in the device and apparatus of the present application, each component can be decomposed and / or reassembled, and such decomposition and / or reassembly should be regarded as an equivalent solution of the present application.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A radial piston hydraulic motor, characterized in that: include: case; Cam surface; A cylinder body, rotatably disposed on the inner side of the cam surface, and provided with a plunger that moves radially back and forth under the guidance of the cam surface, the cylinder body being a power output member of the radial piston hydraulic motor; A hollow shaft extending into the cylinder body; Wherein, a multi-plate brake disc for braking the cylinder body is arranged between the cylinder body and the hollow shaft.

2. The radial piston hydraulic motor according to claim 1, characterized in that: The hollow shaft is fixed to the housing and completely accommodated in the housing, and the radial piston hydraulic motor allows a shaft portion of other equipment to pass through the hollow shaft.

3. The radial piston hydraulic motor according to claim 1, characterized in that: The cam surface is integrally provided on the housing.

4. The radial piston hydraulic motor according to claim 1, characterized in that: The radial piston hydraulic motor includes a bearing arranged between the housing and the cylinder body, the cylinder body includes a radial protrusion for accommodating the piston, and the bearing includes a first bearing and a second bearing respectively arranged closely on the front side and the rear side of the radial protrusion.

5. The radial piston hydraulic motor according to claim 1, characterized in that: The housing of the radial piston hydraulic motor includes a front housing where the cam surface is disposed and a rear housing where a port plate is accommodated. The rear housing positions the port plate by means of positioning pins.

6. The radial piston hydraulic motor according to claim 5, characterized in that: A flange for fixing the radial piston hydraulic motor to an external device is integrally provided on the outer side of the front housing, and the flange at least partially overlaps with the piston in the axial direction.

7. The radial piston hydraulic motor according to claim 5, characterized in that: The rear housing comprises: A first accommodating chamber, accommodating the distribution plate; A second accommodating chamber, accommodating a force-applying component for applying force to the brake disc; The limiting portion is used to limit the rotation of the hollow shaft and limit the bidirectional movement of the hollow shaft in the axial direction.

8. The radial piston hydraulic motor according to claim 7, characterized in that: The brake disc comprises: a plurality of dynamic brake pads connected to the cylinder body in the rotation direction, and a plurality of static brake pads connected to the hollow shaft in the rotation direction; The force-applying assembly includes: a brake pin, which passes through the rear housing and can axially tighten and loosen the brake disc; a brake piston, which is connected to the brake pin and has a force-bearing surface that withstands hydraulic pressure, and when the force-bearing surface is subjected to hydraulic pressure, the brake piston drives the brake pin to move away from the brake disc; a disc spring, which abuts against the brake piston and can push the brake piston and the brake pin toward the brake disc when the force-bearing surface is not subjected to hydraulic pressure.

9. The radial piston hydraulic motor according to claim 7, characterized in that: It also includes a centering ring arranged between the hollow shaft and the cylinder body, and a sealing ring is arranged between the centering ring and the hollow shaft. The centering ring and the limiting portion are located at two axial ends of the hollow shaft.

10. The radial piston hydraulic motor according to claim 5, characterized in that: The front shell includes a necked portion for connecting with the rear shell, the rear shell is provided with a flared portion sleeved outside the necked portion, and a connecting piece connecting the front shell and the rear shell axially passes through the flared portion and the necked portion.

11. The radial piston hydraulic motor according to claim 10, characterized in that: The connecting member extends through a radially outer side of the cam surface.

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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