Radial plunger type hydraulic motor and working machine

Abstract

The utility model provides a radial plunger type hydraulic motor and a working machine. The radial plunger type hydraulic motor comprises a shell, an end cover, a hollow shaft, a sealing plate and a first sealing ring. The end cover is fixed to the rear side of the shell. The hollow shaft is housed within the housing. The sealing plate comprises a plate part and a cylinder part, the plate part is arranged between the shell and the end cover, and the cylinder part extends into the hollow shaft. The first seal ring surrounds the barrel portion and is disposed between the hollow shaft and the plate portion. According to the radial plunger type hydraulic motor, the sealing plate, the hollow shaft and the first sealing ring are matched to provide effective sealing at the rear end of the hollow shaft, so that pollutants are prevented from entering the radial plunger type hydraulic motor from the rear end of the hollow shaft, and the sealing performance of the radial plunger type hydraulic motor is improved.

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. As a type of hydraulic motor, radial piston hydraulic motors are often used in applications that require high torque output. In addition, compared with other types of hydraulic motors, such as axial piston hydraulic motors, radial piston hydraulic motors are usually smaller in the axial direction. Therefore, radial piston hydraulic motors are also often used in applications where the axial installation space is relatively compact.

[0003] The reliability of radial piston hydraulic motors is affected by many factors. For example, contaminants entering the radial piston hydraulic motor will affect the normal operation of the radial piston hydraulic motor, and even cause damage to the radial piston hydraulic motor, thereby affecting the reliability of the radial piston hydraulic motor. Therefore, there is a need for continuous improvement in the sealing performance of radial piston hydraulic motors in the relevant field. Utility Model Content

[0004] In view of this, the present disclosure improves the structure of the radial piston hydraulic motor to enhance the sealing performance of the radial piston hydraulic motor.

[0005] On the one hand, the present disclosure provides a radial piston hydraulic motor, which includes a housing, an end cover, a hollow shaft, a sealing plate and a first sealing ring. The end cover is fixed to the rear side of the housing. The hollow shaft is accommodated in the housing. The sealing plate includes a plate portion and a cylinder portion, the plate portion is arranged between the housing and the end cover, and the cylinder portion extends into the hollow shaft. The first sealing ring is used to provide a seal between the hollow shaft and the sealing plate.

[0006] The cooperation of the sealing plate, the hollow shaft and the first sealing ring provides an effective seal at the rear end of the hollow shaft, which helps to prevent contaminants from entering the interior of the radial piston hydraulic motor from the rear end of the hollow shaft, thereby helping to improve the sealing performance of the radial piston hydraulic motor.

[0007] In a possible implementation manner, the first sealing ring surrounds the cylindrical portion and is disposed between the rear end of the hollow shaft and the plate portion.

[0008] In this way, the first sealing ring can effectively block the gap between the rear end of the hollow shaft and the plate portion, which helps to improve the sealing performance of the radial piston hydraulic motor. In addition, since the first sealing ring is located between the rear end of the hollow shaft and the plate portion, the assembly of the first sealing ring will be easier to achieve.

[0009] In a possible implementation, a positioning recess for positioning the first sealing ring is provided at a corner between the plate portion and the cylinder portion.

[0010] During the assembly process, the first sealing ring can be sleeved on the barrel, and the first sealing ring is seated on the positioning recess. In this way, with the help of the positioning recess, the first sealing ring will avoid being squeezed out from between the hollow shaft and the sealing plate during the assembly process.

[0011] In a possible implementation manner, the first sealing ring surrounds the cylindrical portion and is disposed between the inner surface of the hollow shaft and the outer surface of the cylindrical portion.

[0012] In this way, the first sealing ring can provide a seal between the inner surface of the hollow shaft and the outer surface of the barrel, preventing pollutants from entering the radial piston hydraulic motor from between them, thereby improving the sealing performance of the radial piston hydraulic motor. This structure has better sealing performance.

[0013] In a possible implementation, a first annular groove is provided on the inner surface of the hollow shaft, and the first sealing ring is arranged in the first annular groove and fits tightly with the outer surface of the cylinder.

[0014] The first sealing ring will be positioned more reliably through the first annular groove, which helps to avoid degradation or failure of the sealing effect due to displacement of the first sealing ring.

[0015] In a possible implementation, the inner hole of the hollow shaft includes a main body and a large diameter portion whose inner diameter is larger than that of the main body. The barrel extends into the large diameter portion so that the inner circumference of the barrel does not protrude inwardly beyond the inner circumference of the main body.

[0016] The inner hole of the hollow shaft can be configured to allow the output shaft of the external device to pass through, so as to meet the needs of the assembly space. In the current implementation, the inner circumferential surface of the barrel will not protrude inwardly beyond the inner circumferential surface of the main body, which helps to avoid the output shaft of the external device from contacting the inner circumferential surface of the barrel, thereby helping to avoid wear of the two and helping to avoid the output shaft from being subjected to additional resistance. In addition, since the inner circumferential surface of the barrel does not protrude inwardly beyond the inner circumferential surface of the main body, it will be difficult for contaminants to enter the gap between the barrel and the hollow shaft, which helps to further improve the sealing performance of the radial piston hydraulic motor.

[0017] In a possible implementation, the radial piston hydraulic motor further includes a second sealing ring, a second annular groove is provided on the rear end surface of the housing, and the second sealing ring is disposed in the second annular groove and is tightly fitted to the front side surface of the plate portion.

[0018] The cooperation between the second sealing ring, the second annular groove and the plate portion can provide effective sealing between the rear end face of the housing and the sealing plate, which helps to prevent contaminants from entering the interior of the radial piston hydraulic motor from the rear end of the housing, thereby helping to improve the sealing performance of the radial piston hydraulic motor.

[0019] In a possible implementation, the radial piston hydraulic motor further includes a cylinder body, a brake disc group and a first positioning-sealing assembly. The cylinder body surrounds the hollow shaft and is equipped with a plurality of plungers. A plurality of first brake discs are fixed to the cylinder body in the circumferential direction, a plurality of second brake discs are fixed to the hollow shaft in the circumferential direction, and a plurality of first brake discs and a plurality of second brake discs are alternately placed between the cylinder body and the hollow shaft. The first positioning-sealing assembly is used to prevent the brake disc group from moving forward in the axial direction and to provide a seal between the cylinder body and the hollow shaft.

[0020] The first positioning-sealing component not only limits the axial forward movement of the brake disc group, but also provides a seal between the cylinder body and the hollow shaft. One component plays multiple roles at the same time, which helps to improve the compactness of the radial piston hydraulic motor.

[0021] In a possible implementation, the first positioning-sealing assembly includes a first support ring fixed to the cylinder body and located at the front side of the brake disc assembly to block the brake disc assembly from moving forward in the axial direction by abutting against the brake disc assembly.

[0022] By means of the first support ring fixed to the cylinder body and located at the front side of the brake disc assembly, the first positioning-sealing assembly can limit the axial forward movement of the brake disc assembly.

[0023] In a possible implementation, the first positioning-sealing assembly further includes a first sealing member, which is supported by the first supporting ring and is provided with a first annular sealing lip, and the first annular sealing lip is tightly fitted with the outer circumferential surface of the hollow shaft.

[0024] The cooperation between the first annular sealing lip and the outer peripheral surface of the hollow shaft can provide an effective dynamic seal between the cylinder body and the hollow shaft, which helps to prevent contaminants from entering the interior of the radial piston hydraulic motor through the gap between the cylinder body and the hollow shaft, thereby helping to improve the sealing performance of the radial piston hydraulic motor. In addition, the first support ring not only plays a role in limiting the axial forward movement of the brake disc group, but also plays a role in supporting the first seal. One component plays multiple roles at the same time, which helps to improve the structural compactness of the radial piston hydraulic motor and reduce the number of components.

[0025] In a possible implementation manner, the first positioning-sealing assembly further includes a centering ring, which is supported by the first supporting ring, and the centering ring is configured to center the first supporting ring relative to the hollow shaft.

[0026] The centering ring can help the first support ring to be centered relative to the hollow shaft, ensuring that the axis of the first support ring roughly coincides with the axis of the hollow shaft. If the axis deviation of the two is large, the outer circumference of the hollow shaft will be squeezed unevenly on the first annular sealing lip, which will deteriorate the sealing performance. Therefore, the existence of the centering ring guarantees the sealing performance of the first annular sealing lip to a certain extent. In addition, in addition to the above-mentioned functions, the first support ring also plays the role of supporting the centering ring, which helps to further improve the structural compactness of the radial piston hydraulic motor and reduce the number of components.

[0027] In a possible implementation, a cylinder spline is provided on the inner circumference of the cylinder, and the plurality of first brake discs and the first support ring are fixed to the cylinder in the circumferential direction via the cylinder spline.

[0028] In a possible implementation, the first positioning-sealing assembly further includes a first retaining ring, and the inner periphery of the cylinder body is provided with a first abutting portion. The first support ring abuts against the first abutting portion and the first retaining ring to be fixed to the cylinder body in the axial direction.

[0029] In a possible implementation, the radial piston hydraulic motor further includes a second positioning-sealing assembly, and a coupling portion is provided on the inner periphery of the housing. The second positioning-sealing assembly is used to fix the hollow shaft to the coupling portion in the axial direction and to provide a seal between the hollow shaft and the coupling portion.

[0030] The second positioning-sealing component not only plays the role of fixing the hollow shaft to the joint in the axial direction, but also plays the role of providing a seal between the joint and the hollow shaft. One component plays multiple roles at the same time, which helps to improve the structural compactness of the radial piston hydraulic motor.

[0031] In a possible implementation, the second positioning-sealing assembly includes a second support ring, a second retaining ring and a third retaining ring, wherein the second support ring is located between the joint portion and the hollow shaft. The joint portion is provided with a second abutting portion, and the hollow shaft is provided with a shaft shoulder. The second support ring abuts against the second abutting portion and against the second retaining ring to be fixed to the joint portion in the axial direction. The second support ring abuts against the shaft shoulder and against the third retaining ring to be fixed to the hollow shaft in the axial direction.

[0032] Thus, the second positioning-sealing assembly can play a role in fixing the hollow shaft to the joint portion of the housing in the axial direction.

[0033] In a possible implementation, the second positioning-sealing assembly further includes a fourth sealing ring, a fourth annular groove is provided on the outer periphery of the second support ring, and the fourth sealing ring is arranged in the fourth annular groove and tightly fits with the inner circumference of the joint.

[0034] The cooperation of the fourth sealing ring, the fourth ring groove and the inner circumferential surface of the joint portion can provide an effective seal between the joint portion and the second support ring, which helps to prevent contaminants from entering the interior of the radial piston hydraulic motor from the gap between the two, so as to improve the sealing performance of the radial piston hydraulic motor. In addition, in addition to the above-mentioned functions, the second support ring also plays a role in positioning the fourth sealing ring, which helps to further improve the structural compactness of the radial piston hydraulic motor and reduce the number of components.

[0035] In a possible implementation, the second positioning-sealing assembly further includes a fifth sealing ring, the inner circumference of the second support ring is provided with a fifth annular groove, the fifth sealing ring is arranged in the fifth annular groove and is tightly fitted with the outer circumferential surface of the hollow shaft.

[0036] The cooperation of the fifth sealing ring, the fifth ring groove and the outer peripheral surface of the hollow shaft can provide effective sealing between the hollow shaft and the second support ring, which helps to prevent pollutants from entering the interior of the radial piston hydraulic motor from the gap between the two, so as to improve the sealing performance of the radial piston hydraulic motor. In addition, in addition to the above-mentioned functions, the second support ring also plays a role in positioning the fifth sealing ring, which helps to further improve the structural compactness of the radial piston hydraulic motor and reduce the number of components.

[0037] In a possible implementation, the radial piston hydraulic motor further includes a front end cover, which closes the front end of the housing.

[0038] The front end cover can close the front end of the housing to prevent dust from entering the interior of the hydraulic motor from the front end of the housing, which helps to further improve the sealing performance of the hydraulic motor.

[0039] In a possible implementation, it also includes a cylinder body accommodated in the shell, the front end cover includes a disc portion and a ring portion, the disc portion is located at the front side of the shell, the ring portion surrounds the front portion of the shell, and the disc portion is fastened to the cylinder body by bolts.

[0040] The front end cover is in contact with the housing both in the front side and in the circumferential direction, so that the front end side of the housing can be effectively closed.

[0041] In a possible implementation, the hydraulic motor further includes a cylinder body accommodated in the housing, and a protruding stop portion is further provided on the rear side of the front end cover, and the stop portion extends into the inner circumference of the cylinder body.

[0042] During the assembly process, the cooperation between the stopper portion and the inner periphery of the cylinder body can help the front end cover to be positioned quickly and accurately. In addition, the cooperation between the stopper portion and the inner periphery of the cylinder body helps the front end cover to be firmly installed.

[0043] In one possible implementation, the radial piston hydraulic motor also includes a cylinder body rotatably accommodated in the shell relative to the shell, the inner circumference of the shell is provided with a guide surface, the cylinder body is equipped with a plurality of pistons, the plurality of pistons move radially and are guided by the guide surface so that the cylinder body obtains torque, and the cylinder body is constructed to be connected to an external device to output torque.

[0044] 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

[0045] 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.

[0046] It should be understood that the following drawings only illustrate some, but not all, embodiments of the present disclosure.

[0047] It should be understood that the same or similar reference numerals are used to indicate the same or similar elements.

[0048] 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.

[0049] Figure 1 It is a schematic structural diagram of a radial piston hydraulic motor according to an embodiment of the present disclosure.

[0050] Figure 2 for Figure 1 Exploded diagram of a radial piston hydraulic motor.

[0051] Figure 3 for Figure 1 Longitudinal cross-sectional view of a radial piston hydraulic motor.

[0052] Figure 4 for Figure 3 A partial enlarged view of part B.

[0053] Figure 5 for Figure 3 A partial enlarged view of part C.

[0054] Figure 6 for Figure 3 A partial enlarged view of part D.

[0055] Figure 7 for Figure 3 A partial enlarged view of part E in the middle.

[0056] Figure 8 for Figure 3 A partial enlarged view of part F.

[0057] Fig. 94 is a longitudinal sectional view of a radial piston hydraulic motor according to a first modification of the present disclosure.

[0058] Fig.10 4 is a longitudinal sectional view of a radial piston hydraulic motor according to a second modification of the present disclosure.

[0059] Fig.11 4 is a longitudinal sectional view of a radial piston hydraulic motor according to a third modification of the present disclosure.

[0060] Fig.12 for Fig.11 A partial enlarged view of part G in the middle.

[0061] Fig.13 for Fig.11 A partial enlarged view of part H in the middle.

[0062] Fig.14 for Fig.11 A partial enlarged view of part I.

[0063] Fig.15 4 is a longitudinal sectional view of a radial piston hydraulic motor according to a fourth modification of the present disclosure.

[0064] Fig.16 It is a schematic structural diagram of a working machine according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0065] 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.

[0066] Exemplary Hydraulic Motors

[0067] 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.

[0068] 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 2For 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 91. 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.

[0069] 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, i.e., fixed to the rear housing 13. For example, the end cover 20 may be fastened to the housing 10 by a plurality of bolts 92. 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 hollow shaft 60, etc.

[0070] The cylinder 30 is accommodated in the housing 10 so as to be rotatable relative to the housing 10 about the axis AA. Figure 3 The cylinder body 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. The inner circumference of the housing 10, i.e., the front housing 12, is provided with a guide surface 121, and the plurality of plungers 32 move radially and are guided by the guide surface 121. 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.

[0071] 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.

[0072] 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.

[0073] In order to output torque, the cylinder 30 may be configured to be transmission-connected to an external device to serve as a torque output member of the hydraulic motor 100. As an example, Figure 1As shown, the cylinder body 30 may be provided with a plurality of threaded holes 33, and these threaded holes 33 may be threadedly engaged with fasteners such as bolts passing through an external device to drively connect 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 hollow shaft 60.

[0074] 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.

[0075] 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 at the rear side of the cylinder body 30 and fixed relative to the housing 10, 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 with the plurality of distributor communication ports. The outer periphery of the distributor 40 can be provided with two or more outer annular grooves, and the inner circumferential surface of the housing 10 can be provided with two or more inner annular grooves, and the outer annular grooves are respectively opposite to and connected with the inner annular grooves.

[0076] 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 another outer ring groove. An inner ring groove is connected to the oil inlet 11a, and the other 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.

[0077] 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 housing 10, i.e., the rear housing 13, may be provided with a wall portion 131, and the rear end of each spring 72 abuts against the wall portion 131. 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.

[0078] In order to fix the distributor 40 to the housing 10 in the axial direction, as shown in FIG. Figure 2As 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 wall portion 131 of the housing 10, i.e., 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 wall portion 131, thereby achieving the circumferential fixation of the distributor 40 to the housing 10.

[0079] The brake device 50 is used to brake the torque output member of the hydraulic motor 100 when necessary. The brake device 50 may include a brake disc set 51. The brake disc set 51 may include a plurality of first brake discs 511 and a plurality of second brake discs 512. The plurality of first brake discs 511 and the plurality of second brake discs 512 may be alternately stacked in the axial direction, such as Figure 4 shown.

[0080] The first brake disc 511 may be referred to as a dynamic disc, which may be fixed to the torque output member of the hydraulic motor 100 in the circumferential direction. The second brake disc 512 may be referred to as a static disc, which may be fixed to the non-rotating member of the hydraulic motor 100 in the circumferential direction. When the brake disc group 51 is subjected to axial pressure, the adjacent first brake disc 511 and second brake disc 512 are pressed against each other, and the torque output member is braked by the friction force therebetween. When the axial pressure on the brake disc group 51 is released, the brake is released.

[0081] The torque output member may be a cylinder 30, and the non-rotating member may be a hollow shaft 60. In this case, the cylinder 30 may surround the brake disc set 51, and the brake disc set 51 may surround the hollow shaft 60. In other words, the brake disc set 51 may be located between the cylinder 30 and the hollow shaft 60. At the same time, the hollow shaft 60 needs to be fixed to the housing 10 at least in the circumferential direction.

[0082] The inner circumference of the cylinder 30 may be provided with a cylinder spline, and the plurality of first brake discs 511 may be circumferentially fixed to the cylinder 30 via the cylinder spline. The hollow shaft 60 may be provided with a shaft spline, and the plurality of second brake discs 512 may be circumferentially fixed to the hollow shaft 60 via the shaft spline. The hollow shaft 60 may also be circumferentially fixed to the housing 10 via the spline. In particular, the housing 10, i.e., the rear housing 13, may be provided with a coupling portion 132 surrounding the hollow shaft 60 at the inner end of the wall portion 131, and the hollow shaft 60 may be circumferentially fixed to the coupling portion 132 via the spline.

[0083] To apply and release the brakes, refer to Figure 2 and Figure 3The brake device 50 may further include a brake piston 52 and a spring 53. The spring 53 may be supported by the end cover 20 and press the brake piston 52 forward, so that the brake disc set 51 is pressed by the brake piston 52 to brake the cylinder 30. When the cylinder 30 is required to output torque, the pressurized fluid may be introduced into the release oil chamber 521 located in front of the brake piston 51, as shown in FIG. Figure 3 Under the action of the pressurized fluid, the brake piston 52 overcomes the pressure of the spring 53 and slides backward, and then no longer presses the brake disc group 51, so that the brake is released and the cylinder 30 is released.

[0084] The brake piston 52 may directly press the brake disc set 51, or may indirectly press the brake disc set 51 through one or more intermediate members. Figure 2 and Figure 3 The brake device 50 may also include a plurality of brake pins 54 and brake rings 55. The pressing force from the spring 53 may be transmitted forward to the brake disc assembly 51 through the brake piston 52, the brake pin 54 and the brake ring 55 in sequence. In particular, the hydraulic motor 100 may also include a pad 56. The pad 56 may be located between the brake disc assembly 51 and the brake ring 55 to compensate for the cumulative tolerance of the brake disc assembly 51 in terms of manufacturing and assembly. During assembly, a pad 56 with a specific thickness may be selected according to individual differences. In particular, the coupling portion 132 of the rear housing 13 may be provided with a through hole 1321 extending in the axial direction. The brake pin 54 may pass through the through hole and extend between the brake piston 52 and the brake ring 55. The through hole 1321 may also provide necessary support for the axial sliding of the brake pin 54.

[0085] For certain reasons, the hydraulic motor 100 uses a hollow shaft 60 with an inner hole 61. On the one hand, the inner hole 61 of the hollow shaft 60 can be used for the output shaft of an external device to pass through to meet the needs of assembly space. In this case, the end cover 20 can be provided with an end cover through hole 21 so that the rear end of the hydraulic motor 100 is open. The end cover through hole 21 is preferably coaxial with the inner hole 61, and its inner diameter is preferably not less than the inner diameter of the inner hole 61. On the other hand, the hollow shaft 60 is conducive to reducing the use of materials and reducing weight. The end cover 20 may also not be provided with an end cover through hole 21. In this case, the following sealing structure is still applicable because foreign matter may still enter the other end of the hollow shaft.

[0086] The use of the hollow shaft 60 poses a challenge to the sealing of the hydraulic motor 100. In order to ensure that the hydraulic motor 100 has sufficient sealing performance, refer to Figure 2 , Figure 3 and Figure 5, a sealing plate 81 and a first sealing ring 82 are introduced. The sealing plate 81 may include a plate portion 811 and a cylinder portion 812, and the plate portion 811 may be disposed between the housing 10 (i.e., the rear housing 13) and the end cover 20. The cylinder portion 812 extends into the inner hole 61 of the hollow shaft 60. The first sealing ring 82 surrounds the cylinder portion 812 and is disposed between the rear end of the hollow shaft 60 and the plate portion 811. The cooperation of the sealing plate 81, the hollow shaft 60, and the first sealing ring 82 provides an effective seal at the rear end of the hollow shaft 60, which helps to prevent contaminants from entering the interior of the hydraulic motor 100 from the rear end of the hollow shaft 60, thereby helping to improve the sealing performance of the hydraulic motor 100.

[0087] refer to Figure 3 and Figure 5 , the first sealing ring 82 can surround the cylinder portion 812 and be disposed between the rear end of the hollow shaft 60 and the plate portion 811. In this way, the first sealing ring 82 can effectively block the gap between the rear end of the hollow shaft 60 and the plate portion 811, which helps to improve the sealing performance of the radial piston hydraulic motor 100. In addition, since the first sealing ring 82 is located between the rear end of the hollow shaft 60 and the plate portion 811, the assembly of the first sealing ring 82 will be easier to achieve.

[0088] Further, refer to Figure 5 A positioning recess 813 may be provided at the corner of the plate portion 811 and the cylinder portion 812, and the positioning recess 813 is configured to position the first sealing ring 82. During the assembly process, the first sealing ring 82 may be sleeved on the cylinder portion 812, and the first sealing ring 82 may be seated at the positioning recess 813. In this way, with the help of the positioning recess 813, the first sealing ring 82 may be prevented from being squeezed out from between the hollow shaft 60 and the sealing plate 81 during the assembly process.

[0089] Further, continue to refer to Figure 5 , the inner hole 61 of the hollow shaft 60 may include a main body 611 and a large diameter portion 612. The large diameter portion 612 extends forward from the rear end of the hollow shaft 60 to connect with the main body 611, and the inner diameter of the large diameter portion 612 is larger than the inner diameter of the main body 611. The barrel 812 extends into the large diameter portion 612, so that the inner circumference of the barrel 812 does not protrude inwardly beyond the inner circumference of the main body 611. This structure helps to avoid the output shaft of the external device from contacting the inner circumference of the barrel 812, thereby helping to avoid wear of the two, and helping to avoid the output shaft from being subjected to additional resistance. In addition, since the inner circumference of the barrel 812 does not protrude inwardly beyond the inner circumference of the main body 611, it is difficult for contaminants to enter the gap between the barrel 812 and the large diameter portion 612, which helps to further improve the sealing performance of the hydraulic motor 100.

[0090] In addition, please refer to Figure 2The plate portion 811 of the sealing plate 81 may be provided with a plurality of through holes 814, and the plurality of through holes 814 may be distributed at intervals along the circumferential direction. A plurality of bolts 92 pass through the plurality of through holes 814, respectively, to fix the sealing plate 81 to the rear housing 13 while fixing the end cover 20 to the rear housing 13.

[0091] In addition to the rear end of the hollow shaft 60, it is also necessary to prevent contaminants from entering the interior of the hydraulic motor 100 through the rear end of the rear housing 13. Figure 2 As shown, a second sealing ring 83 is introduced. Figure 3 and Figure 6 The rear end face of the housing 10, i.e., the rear housing 13, may be provided with a second annular groove 133, and the second sealing ring 83 may be placed in the second annular groove 133 and closely fit with the front side face of the plate portion 811. The cooperation of the second sealing ring 83, the second annular groove 133, and the plate portion 811 can provide an effective seal between the rear end face of the housing 10 and the sealing plate 81, which helps to prevent contaminants from entering the interior 100 of the hydraulic motor from the rear end of the housing 10, thereby helping to improve the sealing performance of the hydraulic motor 100.

[0092] In order to prevent contaminants from entering the interior of the hydraulic motor 100 from the front end of the hollow shaft 60, Figure 3 As shown, the hydraulic motor 100 may further include a first positioning-sealing assembly 84. On the one hand, the first positioning-sealing assembly 84 is used to block the brake disc set 51 from moving forward in the axial direction, so that the brake disc set 51 can be compressed under the direct or indirect pressure of the brake piston 52. On the other hand, the first positioning-sealing assembly 84 is also used to provide a seal between the cylinder body 30 and the hollow shaft 60. The first positioning-sealing assembly 84 plays multiple roles at the same time, which helps to improve the structural compactness of the hydraulic motor 100.

[0093] refer to Figure 4 The first positioning-sealing assembly 84 includes a first support ring 841, which is fixed to the cylinder body 30 and located at the front side of the brake disc assembly 51, so as to prevent the brake disc assembly 51 from moving forward in the axial direction by abutting against the brake disc assembly 51. By fixing the first support ring 841 on the cylinder body 30 and located at the front side of the brake disc assembly 51, the first positioning-sealing assembly 84 can play a role in limiting the axial forward movement of the brake disc assembly 51.

[0094] Continue to refer Figure 4, the first positioning-sealing assembly 84 may further include a centering ring 843. For example, the centering ring 843 may be implemented as a gray ring to have both centering and sealing functions. The centering ring 843 may be supported on the first support ring 841 and configured to center the first support ring 841 relative to the hollow shaft 60. For example, the inner circumference of the first support ring 841 is provided with an annular groove at a middle position, and the centering ring 843 may be placed in the annular groove. The centering ring 843 can help the hollow shaft 60 to be centered relative to the housing 10 (front housing 12), ensuring that the axis of the hollow shaft 60 is substantially coincident with the axis of the housing 10 (front housing 12). If the axis deviation of the two is large, the extrusion of the outer circumference of the hollow shaft 60 against the first annular sealing lip 8421 will be uneven in the circumferential direction, which will deteriorate the sealing performance. Therefore, the presence of the first support ring 841 guarantees the sealing performance of the first annular sealing lip 8421 to a certain extent. Furthermore, in addition to the above-mentioned functions, the first support ring 841 also plays a role in supporting the centering ring 843 , which helps to further improve the structural compactness of the hydraulic motor 100 and reduce the number of components.

[0095] Continue to refer Figure 4 , the first positioning-sealing assembly 84 may further include a centering ring 843. For example, the centering ring 843 may be implemented as a Gray ring to have both centering and sealing functions. The centering ring 843 may be supported on the first support ring 841 and configured to center the first support ring 841 relative to the hollow shaft 60. For example, the inner circumference of the first support ring 841 is provided with an annular groove at a position approximately in the middle, and the centering ring 843 may be placed in the annular groove. The centering ring 843 can help the first support ring 841 to center relative to the hollow shaft 60, ensuring that the axis of the first support ring 841 is substantially coincident with the axis of the hollow shaft 60. If the axis deviation of the two is large, the extrusion of the outer circumference of the hollow shaft 60 against the first annular sealing lip 8421 will be uneven in the circumferential direction, which will deteriorate the sealing performance. Therefore, the presence of the first support ring 841 guarantees the sealing performance of the first annular sealing lip 8421 to a certain extent. Furthermore, in addition to the above-mentioned functions, the first support ring 841 also plays a role in supporting the centering ring 843 , which helps to further improve the structural compactness of the hydraulic motor 100 and reduce the number of components.

[0096] Continue to refer Figure 4, the first positioning-sealing assembly 84 may further include a dust ring 844. The dust ring 844 may be supported on the first support ring 841, and is configured to block dust from passing through the gap between the first support ring 841 and the hollow shaft 60. For example, a coupling ring groove is provided at the front end of the first support ring 841, and the dust ring 844 may be placed in the coupling ring groove to be coupled with the first support ring 841. The dust ring 844 can block dust from entering the interior of the hydraulic motor 100, thereby improving the sealing performance of the hydraulic motor 100. In addition, in addition to the above-mentioned functions, the first support ring 841 also plays a role in supporting the dust ring 844, which helps to further improve the structural compactness of the hydraulic motor 100 and reduce the number of components.

[0097] Continue to refer Figure 4 The first positioning-sealing assembly 84 may further include a third sealing ring 845. The outer periphery of the first support ring 841 may be provided with a third annular groove 8411. The third sealing ring 845 may be placed in the third annular groove 8411 and closely fit with the inner circumference of the cylinder body 30. The third sealing ring 845, the third annular groove 8411 and the inner circumference of the cylinder body 30 cooperate to provide an effective seal between the cylinder body 30 and the first support ring 841, which helps to prevent contaminants from entering the interior of the hydraulic motor 100 from the gap between the cylinder body 30 and the first support ring 841, so as to improve the sealing performance of the hydraulic motor 100. In addition, in addition to the above-mentioned functions, the first support ring 841 also plays a role in positioning the third sealing ring 845, which helps to further improve the structural compactness of the hydraulic motor 100 and reduce the number of components.

[0098] In order to provide effective support, the first support ring 841 is preferably fixed to the cylinder body 30, and such fixation needs to take into account both the axial and circumferential directions. As for circumferential fixation, as described above, the inner circumference of the cylinder body 30 may be provided with a cylinder spline, and the plurality of first brake discs 511 and the first support ring 841 may be fixed to the cylinder body 30 in the circumferential direction through the cylinder spline. To achieve axial fixation, as shown in Figure 4, the first positioning-sealing assembly 84 may also include a first retaining ring 846, and the inner circumference of the cylinder body 30 may be provided with a first abutment portion 33. The first support ring 841 abuts against the first abutment portion 33 and against the first retaining ring 846 to be fixed to the cylinder body 30 in the axial direction. In particular, the outer circumference of the first support ring 841 may be provided with a convex ring portion 8412 located between the first retaining ring 846 and the first abutment portion 34, so as to abut against the first retaining ring 846 and the first abutment portion 34 through the convex ring portion 8412. The first retaining ring 846 is a retaining ring for a hole, which can be fixed to the cylinder body 30 through the retaining ring groove 35 on the inner circumference of the cylinder body 30 .

[0099] In order to ensure the airtightness of the release oil chamber 521, it is necessary to provide a seal between the joint 132 and the hollow shaft 60. Figure 2 and Figure 3The hydraulic motor 100 may further include a second positioning-sealing assembly 85. On the one hand, the second positioning-sealing assembly 85 may be used to provide a seal between the hollow shaft 60 and the joint 132. On the other hand, the second positioning-sealing assembly 85 may be used to fix the hollow shaft 60 to the joint 132 in the axial direction. Since the second positioning-sealing assembly 85 performs multiple functions at the same time, the use of the second positioning-sealing assembly 85 improves the structural compactness of the hydraulic motor 100.

[0100] refer to Figure 7 , the second positioning-sealing assembly 85 may include a second support ring 851, a second retaining ring 852 and a third retaining ring 853, and the second support ring 851 may be located between the joint 132 and the hollow shaft 60. The joint 132 may be provided with a second abutting portion 1322, and the hollow shaft 60 may be provided with a shaft shoulder 62. The second support ring 851 abuts against the second abutting portion 1322 and the second retaining ring 852 to be fixed to the joint 132 in the axial direction. The second support ring 851 abuts against the shaft shoulder 62 and the third retaining ring 853 to be fixed to the hollow shaft 60 in the axial direction. As a result, the second positioning-sealing assembly 85 can play the role of fixing the hollow shaft 60 in the axial direction to the joint 132. The second retaining ring 852 is a retaining ring for a hole, which can be fixed to the joint 132 through the retaining ring groove 1323 on the inner circumference of the joint 132. The third retaining ring 853 is a shaft retaining ring, which can be fixed to the hollow shaft 60 through the retaining ring groove 63 on the outer periphery of the hollow shaft 60 .

[0101] Continue to refer Figure 7 The second positioning-sealing assembly 85 may further include a fourth sealing ring 854. The outer periphery of the second support ring 851 may be provided with a fourth annular groove 8511. The fourth sealing ring 854 may be placed in the fourth annular groove 8511 and fit closely with the inner circumference of the joint 132. The cooperation of the fourth sealing ring 854, the fourth annular groove 8511 and the inner circumference of the joint 132 can provide an effective seal between the joint 132 and the second support ring 851. In addition, in addition to the above-mentioned functions, the second support ring 851 also plays a role in positioning the fourth sealing ring 854, which helps to further improve the structural compactness of the hydraulic motor 100 and reduce the number of components.

[0102] Continue to refer Figure 7The second positioning-sealing assembly 85 may further include a fifth sealing ring 855. The inner circumference of the second support ring 851 may be provided with a fifth annular groove 8512. The fifth sealing ring 855 may be placed in the fifth annular groove 8512 and closely fit the outer circumference of the hollow shaft 60. The cooperation of the fifth sealing ring 855, the fifth annular groove 8512 and the outer circumference of the hollow shaft 60 can provide an effective seal between the hollow shaft 60 and the second support ring 851. In addition, in addition to the above-mentioned functions, the second support ring 851 also plays a role in positioning the fifth sealing ring 855, which helps to further improve the structural compactness of the hydraulic motor 100 and reduce the number of components.

[0103] In order to prevent external pollutants from entering the hydraulic motor 100 through the gap between the rotating cylinder 30 and the stationary housing 10, a seal needs to be provided between the two. Figure 2 and Figure 3 The hydraulic motor 100 may further include a second seal 86. The second seal 86 may be located between the housing 10 (i.e., the front housing 12) and the cylinder block 30, and supported by the housing 10, for example, by a shoulder at a front position of the front housing 12. Figure 8 The second seal 86 may be provided with a second annular sealing lip 861, and the second annular sealing lip 861 is closely fitted with the outer peripheral surface of the cylinder body 30. In particular, the second seal 86 may include a plurality of second annular sealing lips 861 arranged at intervals along the axial direction, for example, two. The cooperation between the second annular sealing lip 861 and the outer peripheral surface of the cylinder body 30 can provide an effective dynamic seal between the housing 10 and the cylinder body 30, which helps to prevent contaminants from entering the interior of the hydraulic motor 100 through the gap between the housing 10 and the cylinder body 30, thereby helping to improve the sealing performance of the hydraulic motor 100.

[0104] Back to Figure 2 and Figure 3 , the front housing 12 may include a constricted portion 122, and the rear housing 13 may include a flared portion 134. The flared portion 134 may surround the constricted portion 122 to strengthen the strength of the junction between the front housing 12 and the rear housing 13. The hydraulic motor 100 may further include a sixth sealing ring 87, which may be disposed between the flared portion 134 and the constricted portion 122 to provide a seal therebetween.

[0105] 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 provided by the present disclosure is not limited to the above description. Figures 9 to 15, the hydraulic motor 100a, the hydraulic motor 100b, the hydraulic motor 100c and the hydraulic motor 100d according to the modified examples of the present disclosure are described. It can be understood that they have many identical or similar elements with the hydraulic motor 100. For the purpose of simplicity, for these identical or similar elements, the repeated description will be appropriately omitted by using the same figure marks below.

[0106] refer to Fig. 9 In the first modification of the present disclosure, the end cover 20a of the hydraulic motor 100a has a completely closed structure, that is, the end cover 20a is not provided with an end cover through hole. Although the output shaft of the external device cannot pass through the hydraulic motor 100a, the hollow structure of the hollow shaft 60 can help reduce the overall weight and manufacturing cost of the hydraulic motor 100a.

[0107] refer to Fig.10 In the second modification of the present disclosure, the hollow shaft 60b of the hydraulic motor 100b and the joint 132b of the housing 10 (i.e., the rear housing 13) are integrally formed, the mating splines between the outer periphery of the hollow shaft 60b and the inner periphery of the joint 132b will be eliminated, and the second positioning-sealing assembly 85 in the aforementioned embodiment will also be eliminated. In addition, it should be noted that although in Fig.10 In the embodiment, the end cap 20b has a closed structure, but an end cap 20b having an open structure is also possible.

[0108] refer to Fig.11 and Fig.12 In the third modification of the present disclosure, the first sealing ring 82c of the hydraulic motor 100c can be encircled around the barrel 812 and disposed between the inner surface of the hollow shaft 60c and the outer surface of the barrel 812. In this way, the first sealing ring 82c can provide a seal between the inner surface of the hollow shaft 60c and the outer surface of the barrel 812, preventing contaminants from entering the interior of the hydraulic motor 100c from between them, thereby improving the sealing performance of the hydraulic motor 100c. This structure has a better sealing performance.

[0109] Further, refer to Fig.12 , the inner surface of the hollow shaft 60c may be provided with a first annular groove 64c, and the first sealing ring 82c is placed in the first annular groove 64c and is tightly fitted with the outer surface of the barrel 812. Through the first annular groove 64c, the first sealing ring 82c will be more reliably positioned, which helps to avoid the degradation or failure of the sealing effect caused by the displacement of the first sealing ring 82c. It should be noted that, where feasible, the features of different embodiments of the present invention may be used in combination with other embodiments, for example, the position of the sealing ring may also be independently applied to other embodiments.

[0110] refer to Fig.11The radial piston hydraulic motor 100c may include a front end cover 23, which closes the front end of the housing 10c. The front end cover 23 can close the front end of the housing 10c to prevent dust from entering the interior of the hydraulic motor 100c from the front end of the housing 10c, which helps to further improve the sealing performance of the hydraulic motor 100.

[0111] Further, refer to Fig.13 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 10c and extends radially, and the ring portion 232 surrounds the front part of the housing 10c. The front end cover 23 contacts the housing 10c both in the front side and in the circumferential direction, thereby effectively sealing the front end side of the housing 10c. It can be understood that the front end cover 23 may also have only the disk portion 231 so as to be plate-shaped.

[0112] refer to Fig.11 and Fig.13 The radial piston hydraulic motor 100c may further include a third seal 88. The front end surface of the housing 10c is provided with a sixth annular groove 101. The third seal 88 is disposed in the sixth annular groove 101 and is provided with a third annular sealing lip 881. The third annular sealing lip 881 is tightly fitted with the inner side surface of the disc 231. The cooperation between the third seal 88 and the front end surface of the housing 10c can provide an effective dynamic seal between the housing 10c and the disc 231, which helps to prevent contaminants from entering the interior of the hydraulic motor 100c through the gap between the housing 10c and the disc 231, thereby helping to improve the sealing performance of the hydraulic motor 100c.

[0113] refer to Fig.11 and Fig.13 The radial piston hydraulic motor 100c may further include a dust shielding ring 89. A seventh ring groove 102 is provided on the outer periphery of the front portion of the housing 10c. The dust shielding ring 89 is placed in the seventh ring groove 102 and is surrounded by the ring portion 232 to prevent dust from passing through the gap between the housing 10c and the ring portion 232. The dust shielding ring 89 cooperates with the seventh ring groove 102 to prevent pollutants from entering the interior of the radial piston hydraulic motor 100c through the gap between the outer periphery of the front portion of the housing 10c and the ring portion 232, which helps to improve the sealing performance of the hydraulic motor 100c.

[0114] refer to Fig.11 and Fig.14 The cylinder body 30c of the radial piston hydraulic motor 100c is rotatably accommodated by the housing 10, and the cylinder body 30c 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 a corresponding first connection hole 301, so as 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 30c with a torque input member of an external device.

[0115] The front end cover 23 can prevent dust from entering the inside of the hydraulic motor 100c from the front end of the housing 10c, and provides effective sealing. In addition, the front end cover 23 is fastened to the cylinder body 30c, and does not affect the cylinder body 30c output torque.

[0116] refer to Fig.11 and Fig.14 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 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.

[0117] Fig.15 The hydraulic motor 100d according to the fourth modification of the present disclosure is shown. The hydraulic motor 100d is substantially the same as the hydraulic motor 100c and also has a front cover 23d. The main difference is that the front cover 23d not only plays a sealing role, but also plays a role in transmitting torque. It is precisely because of the difference in function that the front cover 23d can be thicker. The hydraulic motor 100d is described below by example.

[0118] refer to Fig.15 The radial piston hydraulic motor 100d may include an internal fastener 93, a cylinder body 30d is provided with a plurality of second connection holes 302, and a front end cover 23d is provided with a plurality of third connection holes 234, and each internal fastener 94 penetrates a corresponding second connection hole 302 and a corresponding third connection hole 234 to drive the front end cover 23d and the cylinder body 30d together. After the hydraulic motor 100d is installed in the application scenario, the external fastener will pass through the front end cover through hole 233 and extend into the first connection hole 301, and the cylinder body 30d is connected to the torque input member of the external device, and, under the action of the external fastener, the front end face of the front end cover 23d 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.

[0119] In this implementation, during the torque transmission process, a portion of the torque is transmitted through the friction force between the two end faces, thereby reducing the stress on the external fastener, which is beneficial to reducing the risk of accidental damage to the external fastener.

[0120] Further, refer to Fig.15 The rear side of the front cover 23d may also be provided with a protruding stopper 235, which extends into the inner circumference of the cylinder body 30d. During the assembly process, the cooperation between the stopper 235 and the inner circumference of the cylinder body 30d can help the front cover 23d to be positioned quickly and accurately. In addition, the cooperation between the stopper 235 and the inner circumference of the cylinder body 30d helps to firmly install the front cover 23d.

[0121] Exemplary Work Machines

[0122] The present disclosure also 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.16 As shown, the working machine 200 may be a road roller 200. The working machine 200 may include the hydraulic motor 100 (or hydraulic motor 100a, hydraulic motor 100b, hydraulic motor 100c, hydraulic motor 100d) mentioned in the above aspect.

[0123] 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.

[0124] 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.

[0125] 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".

[0126] 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 sealing ring and a second sealing ring, these elements are not defined by these terms, and these terms are only used to distinguish one element from another.

[0127] 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: case; an end cover fixed to the rear side of the housing; a hollow shaft received in the housing; A sealing plate, comprising a plate portion and a cylinder portion, wherein the plate portion is disposed between the shell and the end cover, and the cylinder portion extends into the hollow shaft; as well as The first sealing ring is used to provide sealing between the hollow shaft and the sealing plate.

2. The radial piston hydraulic motor according to claim 1, characterized in that: The first sealing ring surrounds the cylindrical portion and is disposed between the rear end of the hollow shaft and the plate portion.

3. The radial piston hydraulic motor according to claim 2, characterized in that: A positioning recess for positioning the first sealing ring is provided at a corner between the plate portion and the cylinder portion.

4. The radial piston hydraulic motor according to claim 1, characterized in that: The first sealing ring surrounds the cylindrical portion and is disposed between the inner surface of the hollow shaft and the outer surface of the cylindrical portion.

5. The radial piston hydraulic motor according to claim 4, characterized in that: The inner surface of the hollow shaft is provided with a first annular groove, and the first sealing ring is arranged in the first annular groove and is tightly fitted with the outer surface of the barrel.

6. The radial piston hydraulic motor according to any one of claims 1 to 5, characterized in that: The inner hole of the hollow shaft includes a main body and a large diameter portion whose inner diameter is larger than that of the main body; the barrel extends into the large diameter portion so that the inner circumference of the barrel does not protrude inwardly beyond the inner circumference of the main body.

7. The radial piston hydraulic motor according to any one of claims 1 to 5, characterized in that: It also includes a second sealing ring. The rear end surface of the shell is provided with a second annular groove. The second sealing ring is arranged in the second annular groove and is tightly fitted with the front side surface of the plate portion.

8. The radial piston hydraulic motor according to any one of claims 1 to 5, characterized in that: Also includes: A cylinder body, surrounding the hollow shaft and equipped with a plurality of plungers; A brake disc assembly, wherein a plurality of first brake discs are fixed to the cylinder body in a circumferential direction, a plurality of second brake discs are fixed to the hollow shaft in a circumferential direction, and the plurality of first brake discs and the plurality of second brake discs are alternately disposed between the cylinder body and the hollow shaft; as well as The first positioning-sealing assembly is used for preventing the brake disc set from moving forward in the axial direction and for providing sealing between the cylinder body and the hollow shaft.

9. The radial piston hydraulic motor according to claim 8, characterized in that: The first positioning-sealing assembly includes a first supporting ring fixed to the cylinder body and located at the front side of the brake disc assembly to block the brake disc assembly from moving forward in the axial direction by abutting against the brake disc assembly.

10. The radial piston hydraulic motor according to claim 9, characterized in that: The first positioning-sealing assembly further includes a first sealing member, which is supported by the first supporting ring and is provided with a first annular sealing lip, and the first annular sealing lip is tightly fitted with the outer peripheral surface of the hollow shaft.

11. The radial piston hydraulic motor according to claim 10, characterized in that: The first positioning and sealing assembly further includes a centering ring supported by the first support ring, the centering ring being configured to center the first support ring relative to the hollow shaft.

12. The radial piston hydraulic motor according to claim 9, characterized in that: The inner circumference of the cylinder body is provided with a cylinder body spline, and the plurality of first brake discs and the first support ring are fixed to the cylinder body in the circumferential direction through the cylinder body spline.

13. The radial piston hydraulic motor according to claim 12, characterized in that: The first positioning-sealing assembly further includes a first retaining ring, and the inner periphery of the cylinder body is provided with a first abutting portion; the first supporting ring abuts against the first abutting portion and the first retaining ring to be fixed to the cylinder body in the axial direction.

14. The radial piston hydraulic motor according to any one of claims 1 to 5, characterized in that: It also includes a second positioning-sealing component. The inner periphery of the shell is provided with a coupling portion. The second positioning-sealing component is used to fix the hollow shaft to the coupling portion in the axial direction and to provide sealing between the hollow shaft and the coupling portion.

15. The radial piston hydraulic motor according to claim 14, characterized in that: The second positioning-sealing assembly comprises a second supporting ring, a second retaining ring and a third retaining ring, wherein the second supporting ring is located between the joint portion and the hollow shaft, the joint portion is provided with a second abutting portion, and the hollow shaft is provided with a shaft shoulder; the second supporting ring abuts against the second abutting portion and the second retaining ring to be fixed to the joint portion in the axial direction; The second support ring abuts against the shaft shoulder and the third retaining ring to be fixed to the hollow shaft in the axial direction.

16. The radial piston hydraulic motor according to claim 15, characterized in that: The second positioning-sealing assembly further comprises a fourth sealing ring, a fourth ring groove is provided on the outer periphery of the second supporting ring, the fourth sealing ring is arranged in the fourth ring groove and is tightly fitted with the inner peripheral surface of the joint portion; and / or The second positioning-sealing assembly also includes a fifth sealing ring. The inner circumference of the second support ring is provided with a fifth ring groove. The fifth sealing ring is arranged in the fifth ring groove and is tightly fitted with the outer circumferential surface of the hollow shaft.

17. The radial piston hydraulic motor according to any one of claims 1 to 5, characterized in that: A front end cover is also included, and the front end cover closes the front end of the housing.

18. The radial piston hydraulic motor according to claim 17, characterized in that: It also includes a cylinder body accommodated in the housing, the front end cover includes a disc portion and a ring portion, the disc portion is located at the front side of the housing, the ring portion surrounds the front portion of the housing, and the disc portion is fastened to the cylinder body by bolts.

19. The radial piston hydraulic motor according to claim 17, characterized in that: It also includes a cylinder body accommodated in the shell, and a protruding stop portion is provided on the rear side of the front end cover, and the stop portion extends into the inner periphery of the cylinder body.

20. The radial piston hydraulic motor according to any one of claims 1 to 5, characterized in that: It also includes a cylinder body rotatably accommodated in the shell relative to the shell, the inner circumference of the shell is provided with a guide surface, the cylinder body is equipped with a plurality of plungers, the plurality of plungers move radially and are guided by the guide surface so that the cylinder body obtains torque, and the cylinder body is constructed to be connected to a torque input member of an external device to output torque.

21. A working machine, characterized in that: It comprises a radial piston hydraulic motor according to any one of claims 1 to 20.

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