Radial plunger type hydraulic motor and working machine

Abstract

The utility model provides a radial plunger type hydraulic motor. The radial plunger type hydraulic motor comprises a shell, a cylinder body, a shaft and a brake disc set. A guide face is arranged on the inner periphery of the shell. The cylinder is provided with a plurality of plungers which are guided by the guide surface to reciprocate in the radial direction. The shaft is provided on the inner peripheral side of the cylinder, and is fixed to or integrally formed with the cylinder to rotate together with the cylinder. The brake disc group includes a plurality of first brake discs and a plurality of second brake discs, the plurality of first brake discs are circumferentially fixed with the housing, the plurality of second brake discs are circumferentially fixed with the shaft, and the plurality of first brake discs and the plurality of second brake discs are alternately stacked between the housing and the shaft. The cylinder body is a rotating piece, and the shell is a non-rotating piece. The shaft is located on the inner circumferential side of the cylinder to constitute a rotating member that rotates together with the cylinder. And when the brake disc group is pressed, brake connection is established between the rotating part and the non-rotating part, so that the hydraulic motor is braked. The structure can help the hydraulic motor to obtain a smaller axial size under the condition that the brake device is arranged in the hydraulic motor.

Description

Technical Field

[0001] The present disclosure relates to the field of hydraulic technology, and in particular, to a radial piston hydraulic motor and a working machine having the same. Background Art

[0002] A hydraulic motor is a device that can convert liquid pressure energy into mechanical energy. Compared with other types of hydraulic motors, such as axial piston hydraulic motors, radial piston hydraulic motors are usually smaller in axial dimensions and often appear in application scenarios with compact axial installation space. Therefore, there is a continuous demand in the art for reducing the axial dimensions of radial piston hydraulic motors, especially for radial piston hydraulic motors with internally integrated braking devices. Utility Model Content

[0003] In view of this, the present disclosure improves the structure of the radial piston hydraulic motor to help reduce the axial size of the radial piston hydraulic motor.

[0004] In one aspect, the present disclosure provides a radial piston hydraulic motor.

[0005] The radial piston hydraulic motor includes a housing, a cylinder, a shaft and a brake disc group. A guide surface is provided on the inner circumference of the housing. The cylinder is equipped with a plurality of plungers that move radially back and forth under the guidance of the guide surface. The shaft is provided on the inner circumference of the cylinder and is fixed to the cylinder or formed integrally with the cylinder so as to rotate together with the cylinder. The brake disc group includes a plurality of first brake discs and a plurality of second brake discs, the plurality of first brake discs are fixed to the housing in the circumferential direction, the plurality of second brake discs are fixed to the shaft in the circumferential direction, and the plurality of first brake discs and the plurality of second brake discs are alternately stacked between the housing and the shaft.

[0006] The cylinder body is a rotating part, and the housing is a non-rotating part. The shaft is located on the inner circumference of the cylinder body and is fixed or integrally formed with the cylinder body to form a rotating part that rotates with the cylinder body. The brake disc assembly is located between the part of the shaft that extends out of the cylinder body and the housing to establish a braking connection between the rotating part and the non-rotating part when forced, thereby achieving the purpose of braking the hydraulic motor. This structure can make full use of the axial space of the hydraulic motor, thereby helping the hydraulic motor to obtain a smaller axial size when the brake device is built in.

[0007] In a possible implementation, the housing includes a coupling portion surrounding the shaft, the coupling portion at least partially extends into the inner circumference of the cylinder body along the axial direction, the brake disc assembly is located between the coupling portion and the shaft, and the plurality of first brake discs are fixed to the coupling portion in the circumferential direction.

[0008] According to this structure, the cylinder block, the joint and the brake disc assembly will at least partially overlap in the axial direction, which helps to more fully utilize the axial space of the hydraulic motor and further helps the hydraulic motor to obtain a smaller axial size.

[0009] In a possible implementation, the radial piston hydraulic motor further includes a positioning-sealing assembly located between the joint and the shaft, the positioning-sealing assembly being used to directly or indirectly block the brake disc assembly from moving forward in the axial direction and to provide sealing between the joint and the shaft.

[0010] The positioning-sealing assembly can prevent the brake disc assembly from moving forward in the axial direction, so that the brake disc assembly can be compressed to achieve braking after being pressed in the axial direction, rather than moving forward as a whole. At the same time, the seal provided by the positioning-sealing assembly can prevent liquid leakage between the joint and the shaft, avoiding the performance degradation or failure of the hydraulic motor due to leakage.

[0011] In a possible implementation, the positioning and sealing assembly includes a support ring, which is axially retained relative to the joint portion to directly or indirectly block the brake disc group from moving forward in the axial direction.

[0012] By being fixed to the joint portion and being located at the front side of the brake disc assembly, the support ring can limit the axial forward movement of the brake disc assembly.

[0013] In a possible implementation, the positioning-sealing assembly further includes a sealing member, which is supported by the supporting ring and is provided with an annular sealing lip, and the annular sealing lip is tightly fitted with the outer circumferential surface of the shaft.

[0014] The annular sealing lip can form an effective dynamic seal between the shaft and the support ring, thereby improving the sealing performance of the hydraulic motor. In addition, the support ring also supports the seal, which helps to improve the compactness of the hydraulic motor and reduce the number of components.

[0015] In a possible implementation, the positioning-sealing assembly further includes a first sealing ring, a first annular groove is provided on the outer periphery of the support ring, and the first sealing ring is placed in the first annular groove and fits tightly with the inner circumference of the joint.

[0016] The first sealing ring can form an effective static seal between the joint and the support ring, thereby improving the sealing performance of the hydraulic motor. In addition, the support ring also supports the first sealing ring, which helps to improve the compactness of the hydraulic motor and reduce the number of components.

[0017] In one possible implementation, the positioning-sealing assembly also includes a first retaining ring fixed to the inner circumference of the joint, and the inner circumference of the joint is provided with a first abutment portion, the support ring abuts against the first retaining ring and the first abutment portion to be maintained axially relative to the joint.

[0018] During the installation process, the support ring may be pressed against the first pressing portion first, and then the first retaining ring may be pressed against the support ring, thereby achieving the purpose of maintaining the support ring axially relative to the coupling portion.

[0019] In one possible implementation, the radial piston hydraulic motor also includes a second retaining ring fixed to the inner circumference of the cylinder body, and the inner circumference of the cylinder body is provided with a second abutment portion, and the front end of the shaft is provided with a shaft shoulder, which abuts against the second retaining ring and the second abutment portion to fix the shaft to the cylinder body in the axial direction.

[0020] During the installation process, the shaft shoulder can be abutted against the second abutting portion first, and then the second retaining ring can be installed on the front side of the shaft shoulder, so that the purpose of fixing the shaft to the cylinder body in the axial direction can be achieved.

[0021] In a possible implementation, a cylinder spline is provided on the inner periphery of the cylinder body, and a shaft spline is provided on the outer periphery of the shaft. The cylinder spline is combined with the shaft spline to fix the shaft to the cylinder body in the circumferential direction.

[0022] The purpose of fixing the shaft to the cylinder body in the circumferential direction can be achieved through the spline.

[0023] In a possible implementation, the radial piston hydraulic motor further includes a second sealing ring, a second annular groove is provided on the outer periphery of the shaft, and the second sealing ring is placed in the second annular groove and fits tightly with the inner circumferential surface of the cylinder body.

[0024] The second sealing ring can form an effective static seal between the shaft and the cylinder body, preventing foreign matter from entering between the cylinder body and the shaft from the front end of the shaft, which helps to further improve the sealing performance of the hydraulic motor.

[0025] In one possible implementation, the radial piston hydraulic motor also includes a brake piston. The housing is provided with a piston cavity on the rear side of the brake disc group. The brake piston is accommodated in the piston cavity. The brake piston is provided with an acting portion protruding forward. The acting portion tightens or loosens the brake disc group as the brake piston moves axially.

[0026] In this way, the brake piston can directly apply the pressing force to the brake disc group, which is conducive to reducing the number of components of the hydraulic motor, saving axial space, and helping the hydraulic motor to obtain a more compact structure.

[0027] In a possible implementation, the shaft of the radial piston hydraulic motor is a hollow shaft with an inner hole, so that the output shaft of the external device can extend from one axial side of the hydraulic motor to the other axial side of the hydraulic motor through the inner hole.

[0028] The inner hole of the hollow shaft can be used for the output shaft of the external device to pass through to meet the needs of assembly space. In addition, the hollow shaft is conducive to reducing the use of materials and reducing weight.

[0029] In a possible implementation, a radial piston hydraulic motor has a cylinder body configured to be connected to an external device to output torque.

[0030] On the other hand, the present disclosure further provides a working machine, which includes the radial piston hydraulic motor mentioned in the above aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments are briefly introduced below.

[0032] It should be understood that the following drawings only illustrate some, but not all, embodiments of the present disclosure.

[0033] It should be understood that the same or similar reference numerals are used to indicate the same or similar elements.

[0034] It should be understood that the drawings are merely schematic and that the sizes and proportions of elements in the drawings are not necessarily accurate.

[0035] Figure 1 It is a schematic structural diagram of a radial piston hydraulic motor according to an embodiment of the present disclosure.

[0036] Figure 2 for Figure 1 Exploded diagram of a radial piston hydraulic motor.

[0037] Figure 3 for Figure 1 Longitudinal cross-sectional view of a radial piston hydraulic motor.

[0038] Figure 4 for Figure 3 A longitudinal sectional view of the rear housing of a radial piston hydraulic motor.

[0039] Figure 5 for Figure 3 A partial enlarged view of part B.

[0040] Figure 6 for Figure 3 A partial enlarged view of part C.

[0041] Figure 7 4 is a longitudinal sectional view of a radial piston hydraulic motor according to a first modification of the present disclosure.

[0042] Figure 8 for Figure 7 A partial enlarged view of part D.

[0043] Fig. 9 It is a schematic structural diagram of a working machine according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0044] The following is an exemplary description of the embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the present disclosure can be implemented in a variety of ways and should not be construed as being limited to the embodiments described here. The embodiments described here are only for a more thorough and clear understanding of the present disclosure.

[0045] Exemplary Hydraulic Motors

[0046] refer to Figure 1 The present disclosure provides a radial piston hydraulic motor 100, hereinafter referred to as the hydraulic motor 100. The hydraulic motor 100 may include a housing 10, and the housing 10 may be provided with a plurality of oil ports 11, and the plurality of oil ports 11 may include an oil inlet 11a and an oil return port 11b. The pressurized fluid may flow into the hydraulic motor 100 through the oil inlet 11a, and the depressurized fluid that loses hydraulic energy may be discharged from the hydraulic motor 100 through the oil return port 11b.

[0047] The housing 10 may be composed of a front housing 12 and a rear housing 13 assembled together, and the disassembled states of the two housings are shown in FIG. Figure 2 For example, a plurality of oil ports 11 may be provided on the rear housing 13. For example, the front housing 12 and the rear housing 13 may be fastened together by a plurality of bolts 74. Of course, in some embodiments, the housing 10 may be integrally formed, or the housing 10 may be composed of more housing parts assembled together.

[0048] refer to Figure 1 and 2 The hydraulic motor 100 may further include an end cover 20, which may be disposed on the rear side of the housing 10 and fixed to the housing 10, that is, fixed to the rear housing 13. For example, the end cover 20 may be fastened to the housing 10 by a plurality of bolts 75. The housing 10 and the end cover 20 cooperate to form an inner cavity, and some components of the hydraulic motor 100 are accommodated in the inner cavity. These components may include a cylinder 30, a distributor 40, a brake device 50, and a shaft 60, etc.

[0049] refer to Figure 2 and Figure 3 The hydraulic motor 100 further includes a front housing 12 and a cylinder 30. The cylinder 30 is housed in the front housing 12 and the rear housing 13 assembled together and can rotate relative to the housing 10 around the axis AA. Figure 3The cylinder 30 may be provided with a plurality of plunger holes 31 extending radially and spaced apart in the circumferential direction, and a plunger 32 is provided in each plunger hole 31. A guide surface 121 is provided on the inner circumference of the front housing 12, and the cylinder 30 is provided with a plurality of plungers 32. Specifically, each plunger 32 may include a plunger body 321 and a roller 322, and the roller 322 abuts against the guide surface 121 on the radial outer side. The plurality of plungers 32 move radially and are guided by the guide surface 121 so that the cylinder 30 obtains torque, and the cylinder 30 is configured to be connected to an external device to output torque.

[0050] Some of the plunger holes 31 are connected to the oil inlet 11a. Under the action of the fluid, the plungers 32 located in these plunger holes 31 move radially outward. Due to the special shape of the guide surface 121, such as a cam shape, the cooperation between these plungers 32 moving radially outward and the guide surface 121 can obtain torque, thereby converting the liquid pressure energy of the pressurized fluid into mechanical energy.

[0051] Other plunger holes 31 are connected to the oil outlet 11b. As the cylinder body 30 rotates relative to the housing 10 around the axis AA, the plungers 32 located in these plunger holes 31 are pressed and moved radially inward under the action of the guide surface 121, so that the fluid in these plunger holes 31 is discharged through the oil outlet 11b. At the same time, as the cylinder body 30 rotates relative to the housing 10 around the axis AA, the connection relationship between the multiple plunger holes 31 and the oil inlet 11a and the oil outlet 11b changes periodically to continuously obtain torque.

[0052] The torque output member can be configured to be drivingly coupled to an external device, such as, for example, Figure 1 As shown, the torque output member is a cylinder body 30. The cylinder body 30 may be provided with a plurality of threaded holes 33, which may be threadedly engaged with fasteners such as bolts passing through an external device to drive the cylinder body 30 to the external device. Of course, in some embodiments, the hydraulic motor 100 may output torque through other parts, for example, output torque through a part of the housing 10, or output torque through the shaft 60.

[0053] In order to rotatably support the cylinder body 30 on the housing 10, the hydraulic motor 100 may further include a pair of tapered roller bearings 71. The pair of tapered roller bearings 71 are sleeved on the cylinder body 30 and are located on opposite sides of the plurality of plungers 32 in the axial direction. Through the shoulder on the outer periphery of the cylinder body 30 and the shoulder on the inner periphery of the housing 10, the pair of tapered roller bearings 71 fix the cylinder body to the housing 10 in the axial direction and allow the cylinder body 30 to rotate relative to the housing 10 around the axis AA.

[0054] In order to connect the multiple plunger holes 31 with the oil inlet 11a and the oil outlet 11b in a periodically changing manner, a distributor 40 is provided. The distributor 40 can be located on the rear side of the cylinder body 30 and fixed to the rear housing 13 by the positioning pin 73, at least in the circumferential direction. The front end surface of the distributor 40 can be provided with a plurality of distributor communication ports, and the rear end surface of the cylinder body 30 can be provided with a plurality of cylinder body communication ports respectively connected to the plurality of distributor communication ports. The outer periphery of the distributor 40 can be provided with two outer annular grooves, and the inner circumferential surface of the housing 10 can be provided with two inner annular grooves, and the two outer annular grooves are opposite to and connected to the two inner annular grooves.

[0055] The multiple cylinder body communication ports are respectively connected to the multiple plunger holes 31. Some distributor communication ports are connected to an outer ring groove, and other distributor communication ports are connected to an outer outer ring groove. An inner ring groove is connected to the oil inlet 11a, and another inner ring groove is connected to the oil outlet 11b. In this way, the connection between the multiple plunger holes 31 and the oil inlet 11a and the oil outlet 11b is established, and as the cylinder body 30 rotates relative to the housing 10, the connection relationship between the multiple distributor communication ports and the multiple cylinder body communication ports changes periodically, so that the connection relationship between the multiple plunger holes 31 and the oil inlet 11a and the oil outlet 11b changes periodically.

[0056] The distributor 40 may be provided with a plurality of spring placement holes open to the rear, each of which is provided with a spring 72. The rear end of each spring 72 abuts against the housing 10. The plurality of springs 72 can provide a pre-tightening force for the distributor 40, pushing the front end face of the distributor 40 toward the rear end face of the cylinder body 30, and ensuring effective communication between the plurality of cylinder body communication ports and the plurality of distributor communication ports.

[0057] In order to fix the distributor 40 to the housing 10 in the axial direction, as shown in FIG. Figure 2 As shown, a pin 73 may also be provided. The distributor 40 may be provided with a pin placement hole that is open to the rear, and the housing 10, i.e., the coupling portion 131 of the rear housing 13, may be provided with a pin placement hole that is open to the front. The front end of the pin 73 may extend into the pin placement hole of the distributor 40, and the rear end thereof may extend into the pin placement hole of the coupling portion 131, thereby achieving the circumferential fixation of the distributor 40 to the housing 10.

[0058] The brake device 50 is used to brake the torque output member of the hydraulic motor 100 when necessary. Figure 3 and Figure 5 The hydraulic motor 100 may include a brake disc group 51. The brake disc group 51 includes a plurality of first brake discs 511 and a plurality of second brake discs 512, the plurality of first brake discs 511 are circumferentially fixed to the housing 10, the plurality of second brake discs 512 are circumferentially fixed to the shaft 60, and the plurality of first brake discs 511 and the plurality of second brake discs 512 are alternately stacked between the housing 10, specifically the rear housing 13, and the shaft 60.

[0059] The cylinder body 30 is a rotating part, and the housing 10 is a non-rotating part. The shaft is located on the inner circumference of the cylinder body 30 and is fixed or integrally formed with the cylinder body 30 to form a rotating part that rotates together with the cylinder body 30. The brake disc group 51 is located between the part of the shaft 60 that extends out of the cylinder body 30 and the housing 10 to establish a braking connection between the rotating part and the non-rotating part when forced, thereby achieving the purpose of braking the hydraulic motor 100. This structure can make full use of the axial space of the hydraulic motor 100, thereby helping the hydraulic motor 100 to obtain a smaller axial size when a built-in braking device is used.

[0060] refer to Figure 3 and Figure 4 The housing 10 may include a coupling portion 131 located on the inner circumference of the cylinder 30 and surrounding the shaft 60, the coupling portion 131 at least partially extending into the inner circumference of the cylinder 30 in the axial direction, the brake disc group 51 is located between the coupling portion 131 and the shaft 60, and the plurality of first brake discs 511 are fixed to the coupling portion 131 in the circumferential direction. According to this configuration, the cylinder 30, the coupling portion 131 and the brake disc group 51 will at least partially overlap in the axial direction, which helps to more fully utilize the axial space of the hydraulic motor 100 and further helps the hydraulic motor 100 obtain a smaller axial size.

[0061] refer to Figure 5 The hydraulic motor 100 may further include a positioning-sealing assembly 80 located between the joint 131 and the shaft 60 , and the positioning-sealing assembly 80 is used to directly or indirectly block the brake disc group 51 from moving forward in the axial direction and to provide a seal between the joint 131 and the shaft 60 .

[0062] The positioning-sealing assembly 80 can prevent the brake disc assembly 51 from moving forward in the axial direction, so that the brake disc assembly 51 can be compressed to achieve braking after being pressed in the axial direction, rather than moving forward as a whole. At the same time, the seal provided by the positioning-sealing assembly 80 can prevent liquid leakage between the joint 131 and the shaft 60, avoiding brake chamber pressure leakage.

[0063] refer to Figure 5 The positioning-sealing assembly 80 may include a support ring 82, which is held axially relative to the coupling portion 131 to directly or indirectly block the brake disc assembly 51 from moving forward in the axial direction. In other words, the support ring 82 will not produce an obvious displacement relative to the coupling portion 131 in the axial direction, and the relative rotation of the two in the circumferential direction may not be restricted. The brake disc assembly 51 is located between the coupling portion 131 and the shaft 60, and the support ring 82 is held axially relative to the coupling portion 131. By cooperating with the coupling portion 131 and being located at the front side of the brake disc assembly 51, the support ring 82 can play a role in limiting the axial forward movement of the brake disc assembly 51.

[0064] Continue to refer Figure 5 The positioning-sealing assembly 80 may further include a sealing member 81, which is supported by the support ring 82 and is provided with an annular sealing lip 811, and the annular sealing lip 811 is closely fitted with the outer peripheral surface of the shaft 60. The annular sealing lip 811 can form an effective dynamic seal between the shaft 60 and the support ring 82, thereby improving the sealing performance of the hydraulic motor 100. In addition, the support ring 82 also supports the sealing member 81, which helps to improve the compactness of the structure of the hydraulic motor 100 and reduce the number of components.

[0065] The positioning-sealing assembly 80 may further include a first sealing ring 83 . A first annular groove 821 is disposed on the outer periphery of the supporting ring 82 . The first sealing ring 83 is disposed in the first annular groove 821 and is tightly fitted to the inner peripheral surface of the coupling portion 131 .

[0066] The first sealing ring 83 can form an effective static seal between the joint and the support ring 82, thereby improving the sealing performance of the hydraulic motor 100. In addition, the support ring 82 also supports the first sealing ring 83, which helps to improve the compactness of the hydraulic motor 100 and reduce the number of components.

[0067] As an example, see Figure 5 , the support ring 82 can directly conflict with the brake disc group 51 to block the forward movement in the axial direction. Of course, in other examples, the support ring 82 can also indirectly conflict with the brake disc group 51.

[0068] refer to Figure 5 The positioning-sealing assembly 80 may also include a first retaining ring 84 fixed to the inner periphery of the coupling portion 131, and the inner periphery of the coupling portion 131 is provided with a first abutting portion 1311, and the support ring 82 abuts against the first retaining ring 84 and the first abutting portion 1311 to be maintained axially relative to the coupling portion 131.

[0069] During the installation process, the support ring 82 may be first pressed against the first pressing portion 1311 , and then the first retaining ring 84 may be pressed against the support ring 82 , thereby achieving the purpose of maintaining the support ring 82 axially relative to the coupling portion 131 .

[0070] Combination Figure 4 The inner circumference of the coupling portion 131 may be provided with a housing spline, and the plurality of first brake discs 511 may be circumferentially fixed to the coupling portion 131 through the housing spline. The housing spline may be used to fix the plurality of first brake discs 511 to the coupling portion 131 in the circumferential direction.

[0071] refer to Figure 6The hydraulic motor 100 may further include a second retaining ring 85 fixed to the inner circumference of the cylinder body 30, and the inner circumference of the cylinder body 30 is provided with a second abutment portion 34, and the front end of the shaft 60 is provided with a shaft shoulder 61, the shaft shoulder 61 abuts against the second retaining ring 85 and the second abutment portion 34 to fix the shaft 60 to the cylinder body 30 in the axial direction.

[0072] During the installation process, the shaft shoulder 61 can be first pressed against the second abutting portion 34 , and then the second retaining ring 85 can be installed to the front side of the shaft shoulder 61 , so as to achieve the purpose of fixing the shaft 60 to the cylinder body 30 in the axial direction.

[0073] The inner circumference of the cylinder 30 is provided with a cylinder 30 spline, and the outer circumference of the shaft 60 is provided with a shaft 60 spline, and the cylinder 30 spline is combined with the shaft 60 spline to fix the shaft 60 to the cylinder 30 in the circumferential direction. Through the spline, the purpose of fixing the shaft 60 to the cylinder 30 in the circumferential direction can be achieved.

[0074] Continue to refer Figure 6 The hydraulic motor 100 may further include a second sealing ring 86. A second annular groove 62 is provided on the outer periphery of the shaft 60. The second sealing ring 86 is placed in the second annular groove 62 and is tightly fitted with the inner circumference of the cylinder body 30. The second sealing ring 86 can form an effective static seal between the shaft 60 and the cylinder body 30, preventing foreign matter from entering between the cylinder body 30 and the shaft 60 from the front end of the shaft 60, which helps to further improve the sealing performance of the hydraulic motor 100.

[0075] refer to Figure 3 The hydraulic motor 100 may further include a brake piston 52. The housing 10 is provided with a piston cavity 521 at the rear side of the brake disc group 51. The brake piston 52 is accommodated in the piston cavity 521. The brake piston 52 is provided with an action portion 522 protruding forward. The action portion 522 compresses or releases the brake disc group 51 as the brake piston 52 moves axially. In this way, the brake piston 52 can directly apply the pressing force to the brake disc group 51 without using a brake pin to transmit the action force, which is conducive to reducing the number of components of the hydraulic motor 100, saving axial space, and helping the hydraulic motor 100 to obtain a more compact structure.

[0076] refer to Figure 3 The shaft 60 of the hydraulic motor 100 may be a hollow shaft 60 with an inner hole, so that the output shaft 60 of the external device can extend from one axial side of the hydraulic motor 100 to the other axial side of the hydraulic motor 100 through the inner hole 63. The inner hole of the hollow shaft 60 can be used for the output shaft 60 of the external device to pass through, so as to meet the needs of the assembly space. In addition, the hollow shaft 60 is conducive to reducing the use of materials and reducing weight.

[0077] It is understood that the cylinder 30 can be configured to be connected to an external device to output torque, thereby increasing the application scenarios of the hydraulic motor 100.

[0078] The above is a description of the hydraulic motor 100 according to the embodiment of the present disclosure. It is understood that the hydraulic motor 100 provided by the present disclosure is not limited to the above description. Figure 7 and Figure 8 , a hydraulic motor 100a according to a modified example of the present disclosure is described. It can be understood that the hydraulic motor 100a has many identical or similar elements with the hydraulic motor 100. For the purpose of simplicity, for these identical or similar elements, the same reference numerals will be used to appropriately omit repeated descriptions.

[0079] refer to Figure 7 In the first modification of the present disclosure, the hydraulic motor 100a may include a front cover 23, which closes the front end of the housing 10a. In this way, dust can be prevented from entering the interior of the hydraulic motor 100a from the front end of the housing 10a, further improving the sealing performance.

[0080] Continue to refer Figure 7 The front end cover 23 may include a disk portion 231 and a ring portion 232, wherein the disk portion 231 is located at the front side of the housing 10a and extends radially, and the ring portion 232 surrounds the front part of the housing 10a. In this way, the front end cover 23 contacts the housing 10a both in the front side and in the circumferential direction, and can effectively close the front end side of the housing 10a. It can be understood that the front end cover 23 may also have only the disk portion 231 and thus be in a plate shape.

[0081] refer to Figure 7 and Figure 8 The cylinder body 30a of the hydraulic motor 100a is rotatably accommodated by the housing 10a, the cylinder body 30a is provided with a plurality of first connection holes 301, and the front end cover 23 is provided with a plurality of front end cover through holes 233. Each front end cover through hole 233 is aligned with the corresponding first connection hole 301 to allow an external fastener passing through the front end cover through hole 233 and the first connection hole 301 to drivably connect the cylinder body 30a to a torque input member of an external device.

[0082] The front end cover 23 can prevent dust from entering the inside of the hydraulic motor 100a from the front end of the housing 10a, providing effective sealing. In addition, the front end cover 23 is fastened to the cylinder body 30c, and can not affect the cylinder body 30a output torque.

[0083] Continue to refer Figure 7 and Figure 8 The front end cover through hole 233 is provided with an annular bent portion 2331, which is bent toward one side of the cylinder body 30a to extend into the first connecting hole 301. During the assembly process, the annular bent portion 2331 enables the front end cover 23 to be positioned quickly and accurately, thereby aligning each front end cover through hole 233 with the corresponding first connecting hole 301.

[0084] Exemplary Work Machines

[0085] refer to Fig. 9 The present disclosure further provides a working machine 200. The working machine 200 may be, but is not limited to, various types of engineering machinery, mining machinery, metallurgical machinery, ship machinery, port machinery, etc. In particular, Fig. 9 As shown, the working machine 200 may be a road roller 200. The working machine 200 may include the hydraulic motor 100 mentioned in the above aspect.

[0086] In the present disclosure, axial may refer to the extension direction of the rotation axis AA of the torque output member of the hydraulic motor, radial may refer to the direction on a radial plane orthogonal to the axis AA and intersecting the axis AA, circumferential may refer to the circumferential direction around the axis AA, the directional term "rear" may refer to being axially closer to the end cover, and correspondingly, the directional term "front" may refer to being axially farther away from the end cover.

[0087] In the present disclosure, if a component is fixed to another component in the axial direction, it means that there will be no obvious axial relative displacement between the former and the latter. In addition, in the present disclosure, if a component is fixed to another component in the circumferential direction, it means that there will be no obvious circumferential relative displacement between the former and the latter; specifically, if the former is a torque output component, the latter will rotate with it when the former rotates; if the former is a non-rotating component, the latter is also a non-rotating component.

[0088] It should be understood that the term "including" and its variations used in the present disclosure are open inclusions, i.e., "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0089] It should be understood that although the terms “first” or “second” etc. may be used in the present disclosure to describe various elements, for example, a first brake disc and a second brake disc, these elements are not defined by these terms, and these terms are only used to distinguish one element from another.

[0090] It should be understood that the term "and / or" in this article is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0091] The protection scope of the present disclosure is not limited to the above-mentioned embodiments. Any changes or substitutions that can be conceived by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A radial piston hydraulic motor, characterized in that: include: A housing, the inner periphery of which is provided with a guide surface; A cylinder body provided with a plurality of plungers which move radially back and forth under the guidance of the guide surface; A shaft is provided on the inner circumference of the cylinder body and is fixed to the cylinder body or formed integrally with the cylinder body so as to rotate together with the cylinder body; as well as A brake disc group, a plurality of first brake discs are fixed to the housing in a circumferential direction, a plurality of second brake discs are fixed to the shaft in a circumferential direction, and the plurality of first brake discs and the plurality of second brake discs are alternately stacked between the housing and the shaft.

2. The radial piston hydraulic motor according to claim 1, characterized in that: The housing includes a coupling portion located at an inner circumferential side of the cylinder body and surrounding the shaft, the brake disc group is located between the coupling portion and the shaft, and the plurality of first brake discs are fixed to the coupling portion in a circumferential direction.

3. The radial piston hydraulic motor according to claim 2, characterized in that: The invention also comprises a positioning-sealing assembly located between the joint part and the shaft, wherein the positioning-sealing assembly is used to directly or indirectly block the brake disc group from moving forward in the axial direction and to provide sealing between the joint part and the shaft.

4. The radial piston hydraulic motor according to claim 3, characterized in that: The positioning and sealing assembly includes a support ring which is axially held relative to the joint portion to directly or indirectly block the brake disc set from moving forward in the axial direction.

5. The radial piston hydraulic motor according to claim 4, characterized in that: The positioning-sealing assembly further comprises a sealing member, the sealing member is supported by the supporting ring and is provided with an annular sealing lip, the annular sealing lip is in close contact with the outer peripheral surface of the shaft; and / or The positioning-sealing assembly also includes a first sealing ring. A first annular groove is provided on the outer periphery of the supporting ring. The first sealing ring is placed in the first annular groove and is tightly fitted with the inner peripheral surface of the joint portion.

6. The radial piston hydraulic motor according to claim 4, characterized in that: The positioning-sealing assembly also includes a first retaining ring fixed to the inner circumference of the coupling part, and the inner circumference of the coupling part is provided with a first abutting part, the support ring abuts against the first retaining ring and the first abutting part to be maintained axially relative to the coupling part.

7. The radial piston hydraulic motor according to claim 1, characterized in that: The shaft further comprises a second retaining ring fixed to the inner circumference of the cylinder body, and the inner circumference of the cylinder body is provided with a second abutting portion, and the front end of the shaft is provided with a shaft shoulder, and the shaft shoulder abuts against the second retaining ring and the second abutting portion, so as to fix the shaft to the cylinder body in the axial direction; and / or The inner circumference of the cylinder is provided with a cylinder spline, and the outer circumference of the shaft is provided with a shaft spline. The cylinder spline is combined with the shaft spline to fix the shaft to the cylinder in the circumferential direction.

8. The radial piston hydraulic motor according to claim 1, characterized in that: It also includes a second sealing ring. The outer circumference of the shaft is provided with a second annular groove. The second sealing ring is placed in the second annular groove and fits tightly with the inner circumference of the cylinder body.

9. The radial piston hydraulic motor according to any one of claims 1 to 8, characterized in that: It also includes a brake piston, the housing is provided with a piston cavity at the rear side of the brake disc group, the brake piston is accommodated in the piston cavity, the brake piston is provided with an action portion protruding forward, and the action portion presses or releases the brake disc group as the brake piston moves axially.

10. The radial piston hydraulic motor according to any one of claims 1 to 8, characterized in that: The shaft is a hollow shaft having an inner hole, so that an output shaft of an external device can extend from one axial side of the hydraulic motor to the other axial side of the hydraulic motor through the inner hole.

11. The radial piston hydraulic motor according to any one of claims 1 to 8, characterized in that: 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 according to any one of claims 1 to 11.

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