Radial plunger type hydraulic motor and working machine

Abstract

The radial plunger type hydraulic motor comprises a rear shell, a flow distributor and a brake piston, a wall part is arranged on the inner circumference of the rear shell, the wall part divides the inner space of the rear shell into a front containing cavity and a rear containing cavity, the flow distributor is contained in the front containing cavity, and the brake piston is contained in the rear containing cavity. The accommodating cavity can be formed by utilizing the structure of the wall part of the rear shell, so that the brake device can be arranged in the rear shell, and an additional accommodating space does not need to be constructed outside the rear shell. In this way, the brake piston can be arranged in the rear shell of the radial plunger type hydraulic motor, and the axial size of the radial plunger type hydraulic motor cannot be remarkably increased.

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] In some scenarios, the radial piston hydraulic motor needs to be braked. Therefore, a braking device is required. One way is to add a braking device to the outside of the hydraulic motor, and the braking device is usually arranged on the axial side of the hydraulic motor. However, the hydraulic motor and the braking device as a whole still need to occupy a large axial space. Therefore, this method is difficult to apply to application scenarios with a relatively compact axial installation space. Another way is to add a braking device inside the hydraulic motor, but this will cause the axial size of the hydraulic motor to increase significantly. Therefore, this method is also difficult to apply to application scenarios with a relatively compact axial installation space. Utility Model Content

[0004] In view of this, the present disclosure improves the structure of the radial piston hydraulic motor to solve the problem that the radial piston hydraulic motor with a braking function is difficult to use in application scenarios with a relatively compact axial installation space.

[0005] In one aspect, the present disclosure provides a radial piston hydraulic motor.

[0006] The radial piston hydraulic motor provided by the present disclosure includes a rear housing, a distributor and a brake piston. The inner periphery of the rear housing is provided with a wall portion, and the wall portion divides the internal space of the rear housing into a front receiving chamber and a rear receiving chamber. The distributor is received in the front receiving chamber, and the brake piston is received in the rear receiving chamber.

[0007] The wall portion divides the inner space of the rear housing into a front receiving chamber and a rear receiving chamber, and the distributor and the brake piston are respectively received in two receiving chambers separated from each other without affecting each other. This structure helps to accommodate the brake device in the rear housing of the hydraulic motor without significantly increasing the axial size of the radial piston hydraulic motor.

[0008] In a possible implementation, the radial piston hydraulic motor further includes a positioning pin, and the distributor is fixed to the wall portion in the circumferential direction via the positioning pin.

[0009] In this way, the distributor can be fixed to the wall of the rear housing, which helps to ensure the stability and reliability of the radial piston hydraulic motor during operation.

[0010] In a possible implementation, the radial piston hydraulic motor further includes an elastic member located between the wall portion and the distributor, and the elastic member presses the distributor forward.

[0011] The elastic member can provide a pre-tightening force for the distributor, pushing the front end surface of the distributor toward the rear end surface of the cylinder body, thereby ensuring effective communication between the multiple cylinder body communication ports and the multiple distributor communication holes.

[0012] In a possible implementation, the wall portion includes a first thickened portion protruding backwards, and a first avoidance recess is provided on the front side of the brake piston, and the first avoidance recess is directly opposite to the first thickened portion to avoid the first thickened portion.

[0013] Since the first thickened portion is thicker, it can provide processing space for a hole with a greater depth. Therefore, the hole for accommodating the positioning pin can be processed on the first thickened portion. In addition, since the first thickened portion is thicker, it has higher strength and is not easily damaged. Therefore, the rear end of the elastic member can abut against the first thickened portion. The cooperation between the first thickened portion and the first avoidance recess can help improve the utilization rate of the space in the rear shell, thereby helping the hydraulic motor to obtain a more compact axial size.

[0014] In a possible implementation, the radial piston hydraulic motor further includes a shaft, and the rear housing further includes a coupling portion, which is formed at the inner end of the partition wall portion and extends forward, and the coupling portion surrounds the shaft and is fixedly coupled to or integrally formed with the shaft.

[0015] According to this implementation, the rear housing can be fixedly combined with the shaft without increasing the axial dimension of the rear housing, which helps the hydraulic motor to obtain a more compact axial dimension.

[0016] In one possible implementation, the radial piston hydraulic motor also includes a brake disc group and a brake pin. The brake disc group is located on the front side of the joint. The joint is provided with a through hole extending in the front-to-back direction. The rear end of the brake pin is fixed to the brake piston and the front end extends out of the front side of the joint through the through hole, so that the brake pin tightens or loosens the brake disc group as the brake piston moves axially.

[0017] After passing through the through hole, the brake pin can contact the brake piston and the brake disc assembly. Under the control of the brake piston, the brake pin can act on the brake disc assembly, thereby braking or releasing the torque output member. In addition, the through hole also plays a role in sliding guidance for the brake pin, providing necessary support and guidance for the axial sliding of the brake pin. In addition, since the axial dimension of the joint is large, the through hole opened on the joint can have a sufficient length. A sufficiently long through hole can provide better support and guidance for the brake pin.

[0018] In a possible implementation, the brake piston is provided with a receiving groove for receiving the rear end of the brake pin and an exhaust hole connected to the receiving groove.

[0019] Due to the presence of the exhaust hole, when the rear end of the brake pin is installed into the receiving groove, the air in the receiving groove can be discharged through the exhaust hole, which helps to avoid the problem of difficult assembly of the brake pin due to air trapped in the receiving groove.

[0020] In one possible implementation, the brake piston includes a second thickened portion protruding forward, the brake pin is fixed to the second thickened portion, and a second avoidance recess is provided on the overall rear side of the inner ring portion of the joint portion and the partition wall portion, and the second avoidance recess is opposite to the second thickened portion to avoid the second thickened portion.

[0021] The second thickened portion is formed at the position where the brake pin is fixed, which can increase the structural strength of the brake piston. In addition, the cooperation between the second avoidance recess and the second thickened portion can help improve the utilization rate of the space in the rear shell, thereby helping the hydraulic motor to obtain a more compact axial size.

[0022] In a possible implementation, the inner ring portion protrudes forward, and a third avoidance recess is provided on the front side of the distributor, and the third avoidance recess is directly opposite to the inner ring portion to avoid the inner ring portion.

[0023] The inner ring portion protruding forward can ensure that it has sufficient thickness while participating in the formation of the second avoidance recess. In addition, the cooperation between the third avoidance recess and the inner ring portion can help improve the utilization rate of the space in the rear shell, thereby helping the hydraulic motor to obtain a more compact axial size.

[0024] In a possible implementation, the radial piston hydraulic motor also includes a support ring, a first retaining ring fixed to the joint and a second retaining ring fixed to the shaft, the inner periphery of the joint is provided with a supporting portion, the shaft is provided with a shaft shoulder, the support ring abuts against the abutting portion and against the first retaining ring to be fixed to the joint in the axial direction; the support ring abuts against the shaft shoulder and against the second retaining ring to be fixed to the shaft in the axial direction.

[0025] The support ring is located between the coupling part and the shaft, and its forward movement is limited by the abutment part and the shaft shoulder, and its backward movement is limited by the first retaining ring and the second retaining ring, so the axial movement of the coupling part and the shaft is limited. By providing the support ring, the coupling part and the shaft can be reliably coupled in the axial direction.

[0026] In a possible implementation, an inner circumference of the coupling portion is provided with an internal spline, and an outer circumference of the shaft is provided with an external spline, and the internal spline is combined with the external spline to fix the shaft to the coupling portion in the circumferential direction.

[0027] By combining the internal splines with the external splines, the shaft can be reliably fixed to the combined portion in the circumferential direction.

[0028] In one possible implementation, the radial piston hydraulic motor also includes a shaft and a brake disc group, the rear housing also includes a coupling portion, the coupling portion is formed at the inner end of the partition wall portion and extends forward, the coupling portion surrounds the shaft, a plurality of first brake discs are fixed to the coupling portion in the circumferential direction, a 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 placed between the coupling portion and the shaft.

[0029] The first brake disc is circumferentially fixed to the non-rotating component (rear housing) of the radial piston hydraulic motor, and the second brake disc is circumferentially fixed to the rotating component (shaft). When the brake disc group is subjected to axial pressure, the adjacent first brake disc and the second brake disc are pressed against each other, and the moving component (shaft) is braked by the friction force between them. When the axial pressure on the brake disc group is cancelled, the brake is released. Therefore, the torque output member can be braked or released by the brake disc group. In this implementation, the brake disc group is located on the inner circumference side of the joint, which will not or less increase the radial size of the rear housing, thereby helping the hydraulic motor to obtain a more compact axial size.

[0030] In one possible implementation, a plurality of inner mating surfaces are provided on the inner circumference of the rear shell body, the plurality of inner mating surfaces are spaced apart along a direction from front to rear and the inner diameters decrease successively, and an inner annular groove is provided between any two adjacent inner mating surfaces; a plurality of outer mating surfaces are provided on the outer circumference of the distributor, the plurality of outer mating surfaces are spaced apart along a direction from front to rear and the inner diameters decrease successively, and an outer annular groove is provided between any two adjacent outer mating surfaces; the plurality of inner mating surfaces are tightly fitted with the plurality of outer mating surfaces respectively, so as to connect each inner annular groove with a corresponding outer annular groove.

[0031] The inner diameters of the multiple outer mating surfaces decrease in sequence from the front to the rear, so that the height of the front wall of the outer ring groove formed between two adjacent outer mating surfaces is greater than the height of the rear wall. In this way, when the pressurized fluid enters the outer ring groove, the pressure received by the front wall of the outer ring groove is greater than the pressure received by the rear wall of the outer ring groove, which can help push the front end face of the distributor toward the rear end face of the cylinder body, thereby ensuring effective communication between the multiple cylinder body communication ports and the multiple distributor communication holes.

[0032] In one possible implementation, the radial piston hydraulic motor also includes a front housing and a first fastener, one of the front housing and the rear housing is provided with a necked portion and the other is provided with a flared portion, the flared portion surrounds the necked portion, and the first fastener passes through the flared portion and is connected to the necked portion to fasten the front housing to the rear housing.

[0033] By connecting the front housing and the rear housing through the necking portion, the flaring portion and the first fastener, the shear resistance of the front housing and the rear housing can be enhanced, ensuring that the hydraulic motor has sufficient structural strength.

[0034] In a possible implementation, the radial piston hydraulic motor further includes an end cover and a second fastener, wherein the end cover is located at the rear side of the rear housing, and the second fastener passes through the end cover and is connected to the rear housing to fasten the end cover to the rear housing.

[0035] The end cover can at least partially close the rear end of the radial piston hydraulic motor.Through the connection of the second fastener, the end cover can be reliably fastened on the rear housing.

[0036] In one possible implementation, the radial piston hydraulic motor also includes a front housing and a cylinder body, the cylinder body is accommodated in the front housing and the rear housing that are assembled together, the inner periphery of the front housing 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 an external device to output torque.

[0037] 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

[0038] 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.

[0039] It should be understood that the following drawings only illustrate some, but not all, embodiments of the present disclosure.

[0040] It should be understood that the same or similar reference numerals are used to indicate the same or similar elements.

[0041] 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.

[0042] Figure 1 It is a schematic structural diagram of a radial piston hydraulic motor according to an embodiment of the present disclosure.

[0043] Figure 2 for Figure 1 Exploded diagram of a radial piston hydraulic motor.

[0044] Figure 3 for Figure 1 Longitudinal cross-sectional view of a radial piston hydraulic motor.

[0045] Figure 4 for Figure 3 A longitudinal sectional view of the rear housing of a radial piston hydraulic motor.

[0046] Figure 5 for Figure 3 A longitudinal sectional view of a portion of a radial piston hydraulic motor

[0047] Figure 6 for Figure 3 A longitudinal sectional view of a portion of a radial piston hydraulic motor.

[0048] Figure 7 for Figure 3 A longitudinal sectional view of a portion of a radial piston hydraulic motor.

[0049] Figure 8 for Figure 3 A longitudinal sectional view of a portion of a radial piston hydraulic motor.

[0050] Fig. 9 4 is a longitudinal sectional view of a radial piston hydraulic motor according to a first modification of the present disclosure.

[0051] Fig.10 for Fig. 9 A longitudinal sectional view of the rear housing of a radial piston hydraulic motor.

[0052] Fig.11 4 is a longitudinal sectional view of a radial piston hydraulic motor according to a second modification of the present disclosure.

[0053] Fig.12 for Fig.11 A longitudinal sectional view of the rear housing of a radial piston hydraulic motor.

[0054] Fig.13 4 is a longitudinal sectional view of a radial piston hydraulic motor according to a third modification of the present disclosure.

[0055] Fig.14 for Fig.13 A partial enlarged view of part B.

[0056] Fig.15 4 is a longitudinal sectional view of a radial piston hydraulic motor according to a fourth modification of the present disclosure.

[0057] Fig.16 4 is a longitudinal sectional view of a radial piston hydraulic motor according to a fifth modification of the present disclosure.

[0058] Fig.17 It is a schematic structural diagram of a working machine according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0059] 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.

[0060] Exemplary Hydraulic Motors

[0061] 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.

[0062] 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.

[0063] 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.

[0064] refer to Figure 2 and Figure 3 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 3 The 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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 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.

[0070] 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.

[0071] The braking device 50 can be used to control the motion state of the torque output member of the hydraulic motor 100 so that the torque output member switches between a braking state and a release state. The torque output member can be the cylinder 30 or the shaft 60 .

[0072] refer to Figure 3 The inner periphery of the rear housing 13 is provided with a wall portion 131, which divides the inner space of the rear housing 13 into a front receiving chamber and a rear receiving chamber, and the distributor 40 is received in the front receiving chamber. The brake device 50 may include a brake piston 52, and the brake piston 52 may be received in the rear receiving chamber.

[0073] The structure of the wall portion 131 of the rear housing 13 can form a receiving cavity, so that the brake device 50 can be arranged inside the rear housing 13, without constructing an additional receiving space outside the rear housing 13. In this way, the hydraulic motor 100 can arrange the brake piston 52 inside the rear housing 13 without significantly increasing the axial size of the hydraulic motor 100.

[0074] refer to Figure 2 The hydraulic motor 100 may further include a positioning pin 73, the distributor 40 may be provided with a pin placement hole open to the rear, and the wall portion 131 of the rear housing 13 may be provided with a pin placement hole 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. In this way, the distributor 40 can be fixed to the wall portion 131 of the rear housing 13, which helps to ensure the stability and reliability of the hydraulic motor 100 during operation.

[0075] refer to Figure 3 The hydraulic motor 100 may further include an elastic member 53 between the wall portion 131 and the distributor 40, and the elastic member 53 presses the distributor 40 forward. In this way, the elastic member 53 can provide a pre-tightening force for the distributor 40, push the front end surface of the distributor 40 toward the rear end surface of the cylinder body 30, and ensure the effective communication between the multiple cylinder body 30 communication ports and the multiple distributor 40 communication holes.

[0076] refer to Figure 5The wall portion 131 may further include a first thickened portion 1311 protruding backwards, and a first avoidance recess 521 is provided on the front side of the brake piston 52 , and the first avoidance recess 521 is directly opposite to the first thickened portion 1311 to avoid the first thickened portion 1311 .

[0077] Since the elastic member 53 has a force to force the distributor 40 to move forward, the wall portion 131 will be in a compressed state at the position in contact with the elastic member 53. The first thickened portion 1311 formed on the wall portion 131 can enhance the structural strength of the wall portion 131 and prevent damage caused by pressure. On the other hand, the first avoidance recess 521 on the brake piston 52 can accommodate the first thickened portion 1311 protruding backwards from the wall portion 131, preventing the brake piston 52 from being squeezed and damaged by the first thickened portion 1311 after assembly.

[0078] refer to Figure 3 The hydraulic motor 100 also includes a shaft 60, and the rear housing 13 also includes a coupling portion 132, which is formed at the inner end of the partition wall portion 131 and extends forward. The coupling portion 132 surrounds the shaft 60 and is fixedly coupled to the shaft 60, without adding a component for fixing the shaft outside the housing.

[0079] refer to Figure 2 and Figure 3 The hydraulic motor 100 may further include a brake disc set 51. The brake disc set 51 is located between the cylinder block 30 and the shaft 60, and a portion of the shaft 60 in the circumferential direction is fixed to the rear housing 13. Of course, in other examples, a portion of the shaft 60 in the circumferential direction may be fixed to the front housing 12.

[0080] refer to Figure 7 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.

[0081] The first brake disc 511 may be referred to as a dynamic disc, which can 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 can be fixed to the non-rotating member of the hydraulic motor 100 in the circumferential direction. Figure 3 , the first brake disc 511 is fixed to the cylinder body 30, and the second brake disc 512 is fixed to the shaft 60. When the brake disc set 51 is subjected to axial pressure, the adjacent first brake disc 511 and second brake disc 512 are pressed against each other, and the cylinder body 30 is braked by the friction between them. When the axial pressure on the brake disc set 51 is cancelled, the brake is released.

[0082] There are many ways to apply and cancel the brake. As an example, the hydraulic motor 100 can apply and cancel the brake through the brake piston 52 and the elastic member 53. Figure 3The elastic member 53 can be supported by the end cover 20 and press the brake piston 52 forward, so as to press the brake disc group 51 through the brake piston 52 and brake the cylinder 30. When the cylinder 30 needs to output torque, the pressurized fluid can be introduced into the release oil chamber 521 located in front of the brake piston 52. Under the action of the pressurized fluid, the brake piston 52 overcomes the pressure of the elastic member 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.

[0083] 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 further include a plurality of brake pins 54 , brake rings 55 and brake rings 56 , and the pressing force from the elastic member 53 may be transmitted forward to the brake disc assembly 51 through the brake piston 52 , the brake pins 54 , the brake rings 55 and the brake rings 56 in sequence.

[0084] refer to Figure 3 and Figure 4 The brake disc assembly 51 is located at the front side of the coupling portion 132. The coupling portion 132 is provided with a through hole 1321 which passes through in the front-to-back direction. The rear end of the brake pin 54 is fixed to the brake piston 52 and the front end extends out of the front side of the coupling portion 132 through the through hole 1321, so that the brake pin 54 tightens or loosens the brake disc assembly 51 as the brake piston 52 moves axially.

[0085] In this way, the brake pin 54 can contact the brake piston 52 and the brake disc assembly 51 after passing through the through hole 1321. Under the control of the brake piston 52, the brake pin 54 can act on the brake disc assembly 51, thereby braking or releasing the cylinder 30. In addition, the through hole 1321 also plays a role in sliding guidance for the brake pin 54, providing necessary support for the axial sliding of the brake pin 54.

[0086] refer to Figure 3 and Figure 5 The brake piston 52 may include a second thickened portion 522 protruding forward, the brake pin 54 is fixed to the second thickened portion 522, and a second avoidance recess 1312 is provided on the overall rear side of the inner ring portion of the coupling portion 132 and the partition wall portion 131, and the second avoidance recess 1312 is directly opposite to the second thickened portion 522 to avoid the second thickened portion 522.

[0087] The second thickened portion 522 is constructed at the position where the brake pin 54 is fixed, which can increase the structural strength of the brake piston 52. In addition, the second avoidance recess 1312 of the joint portion 132 can accommodate the second thickened portion 522 of the brake piston 52, thereby preventing the joint portion 132 from being squeezed and damaged by the second thickened portion 522 after assembly.

[0088] Continue to refer Figure 3 and Figure 5 The inner ring portion can protrude forward, and a third avoidance recess 401 is provided on the front side of the distributor 40, and the third avoidance recess 401 is directly opposite to the inner ring portion to avoid the inner ring portion. In this way, the third avoidance recess 401 on the distributor 40 can accommodate the protruding portion of the inner ring portion, thereby preventing the distributor 40 from being squeezed and damaged by the protruding portion of the inner ring portion after assembly.

[0089] Continue to refer Figure 3 and Figure 5 The brake piston 52 may be provided with a receiving groove 523 and an exhaust hole 524. The receiving groove 523 receives the rear end of the brake pin 54, and the exhaust hole 524 is connected to the receiving groove 523. The receiving groove 523 may be provided on the second thickened portion 522, and may be open forward. The exhaust hole 524 may extend backward from the rear end surface of the receiving groove 523, and form an opening on the rear side surface of the brake piston 52.

[0090] Due to the existence of the exhaust hole 524, when the rear end of the brake pin 54 is installed into the receiving groove 523, the air in the receiving groove 523 can be discharged through the exhaust hole 524, which helps to avoid the problem of the brake pin 54 being difficult to assemble due to air being trapped in the receiving groove 523.

[0091] refer to Figure 5 The hydraulic motor 100 may further include a support ring 81, a first retaining ring 82 fixed to the joint 132, and a second retaining ring 85 fixed to the shaft 60. The inner periphery of the joint 132 may be provided with a butting portion 83, and the shaft 60 may be provided with a shaft shoulder 84. The support ring 81 butts against the butting portion 83 and the first retaining ring 82 to be fixed to the joint 132 in the axial direction. The support ring 81 butts against the shaft shoulder 84 and the second retaining ring 85 to be fixed to the shaft 60 in the axial direction.

[0092] The support ring 81 is located between the coupling portion 132 and the shaft 60, and its forward movement is limited by the abutment portion 83 and the shaft shoulder 84, and its backward movement is limited by the first retaining ring 82 and the second retaining ring 85, so that the axial movement of the coupling portion 132 and the shaft 60 is limited. In this way, by providing the support ring 81, the coupling portion 132 and the shaft 60 are fixedly coupled, which helps to ensure the stability and reliability of the hydraulic motor 100 during operation.

[0093] refer to Figure 4 The inner circumference of the coupling portion 132 may be provided with an internal spline, and the outer circumference of the shaft 60 may be provided with an external spline, and the internal spline and the external spline are combined to fix the shaft 60 to the coupling portion 132 in the circumferential direction.

[0094] refer to Figure 3 and Figure 6The inner circumference of the rear shell body 13 can also be provided with a plurality of inner mating surfaces 91, which are spaced apart from each other in the direction from front to back and whose inner diameters decrease successively, and an inner annular groove 92 is provided between any two adjacent inner mating surfaces 91; the outer circumference of the distributor 40 is provided with a plurality of outer mating surfaces 93, which are spaced apart from each other in the direction from front to back and whose inner diameters decrease successively, and an outer annular groove 94 is provided between any two adjacent outer mating surfaces 93; the plurality of inner mating surfaces 91 are respectively tightly fitted with the plurality of outer mating surfaces 93 to connect each inner annular groove 92 with a corresponding outer annular groove 94.

[0095] The inner diameters of the multiple outer mating surfaces 93 decrease in sequence from the front to the rear, so that the front wall height of the outer annular groove 94 formed between two adjacent outer mating surfaces 93 is greater than the rear wall height. In this way, when the pressurized fluid enters the outer annular groove 94, the pressure received by the front wall of the outer annular groove 94 is greater than the pressure received by the rear wall of the outer annular groove 94, thereby enabling the pressurized fluid to push the distributor 40 to move forward.

[0096] refer to Figure 7 The hydraulic motor 100 may further include a front housing 12 and a first fastener 14. As an example, the front housing 12 is provided with a constricted portion 15, and the rear housing is provided with a flared portion 16, the flared portion 16 surrounds the constricted portion 15, and the first fastener 14 passes through the flared portion 16 and is connected to the constricted portion 15 to fasten the front housing 12 to the rear housing 13.

[0097] At the connection between the front housing 12 and the rear housing 13 , there are a constricted portion 15 , a flared portion 16 and a first fastener 14 , so that the shear resistance of the hydraulic motor 100 can be enhanced.

[0098] It is understandable that the hydraulic motor 100 may also be constructed such that the front housing 12 is provided with a flared portion 16 , the rear housing is provided with a constricted portion 15 , and the first fastener 14 passes through the flared portion 16 and is connected to the constricted portion 15 .

[0099] refer to Figure 2 and Figure 3 The hydraulic motor 100 further includes an end cover 20 and a second fastener 74, wherein the end cover 20 is located at the rear side of the rear housing 13, and the second fastener 74 passes through the end cover 20 and is connected to the rear housing 13 to fasten the end cover 20 to the rear housing 13. In this way, the end cover 20 can be reliably fastened to the rear housing 13 through the connection of the second fastener 74.

[0100] refer to Figure 3, the hydraulic motor 100 may adopt a hollow shaft 60 having an inner hole 61. On the one hand, the inner hole 61 of the hollow shaft 60 may be used for the output shaft of an external device to pass through, so as to meet the needs of assembly space. In this case, the end cover 20 may 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.

[0101] 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. Figures 9 to 11 , the hydraulic motor 100a and the hydraulic motor 100b according to the modified example 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 same reference numerals will be used to appropriately omit repeated descriptions.

[0102] refer to Fig. 9 and Fig.10 In the first modification of the present disclosure, the hydraulic motor 100a may include a shaft 60a, and the rear housing 13a may further include a coupling portion 132a, the coupling portion 132a being formed at the inner end of the partition wall portion 131 and extending forward, the coupling portion 132a surrounding the shaft 60a and being formed integrally with the shaft 60a. In this way, the number of components of the hydraulic motor can be reduced, thereby simplifying the assembly steps. The coupling portion 132a surrounding the shaft 60a and being formed integrally with the shaft 60a, therefore, compared to the hydraulic motor 100, the inner periphery of the coupling portion 132a does not need to be provided with a spline, nor does it need to be provided with a support ring to connect the coupling portion 132a and the shaft 60a.

[0103] refer to Fig. 9 and Fig.10 In the first modification of the present disclosure, the brake disc group 51 of the hydraulic motor 100a is located between the cylinder body 30 and the shaft 60a, and the brake disc group 51 may include a plurality of first brake discs 511 and a plurality of second brake discs 512. The first brake disc 511 is fixed to the cylinder body 30, and the second brake disc 512 is fixed to the shaft 60a. 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 cylinder body 30 is braked by the friction force therebetween. When the axial pressure on the brake disc group 51 is cancelled, the brake is released.

[0104] refer to Fig.11 and Fig.12In the second modification of the present disclosure, a brake disc assembly 51b, a brake piston 52b and a shaft 60b may be included. The rear housing 13b further includes a coupling portion 132b formed at the inner end of the partition wall portion 131 and extending forward, and the coupling portion 132b surrounds the shaft 60b.

[0105] Similar to the embodiment hydraulic motor 100, the brake disc group 51b of the hydraulic motor 100b may include a plurality of first brake discs 511b and a plurality of second brake discs 512b. The first brake disc 511b is fixed to the coupling portion 132 in the circumferential direction, and the plurality of second brake discs 512b is fixed to the shaft 60b in the circumferential direction, and the plurality of first brake discs 511b and the plurality of second brake discs 512b are alternately placed between the coupling portion 132b and the shaft 60b. When the brake disc group 51b is subjected to axial pressure, the adjacent first brake discs 511b and the second brake discs 512b are pressed against each other, and the torque output member (i.e., the shaft 60b) is braked by the friction force therebetween. When the axial pressure on the brake disc group 51b is cancelled, the brake is released.

[0106] refer to Fig.12 The pressing force from the elastic member 53 can be directly transmitted to the brake disc assembly 51 through the brake piston 52 , which can reduce the number of components of the hydraulic motor 100 .

[0107] refer to Fig.12 The inner circumference of the coupling portion 132b may be provided with a spline, and the plurality of first brake discs 511b may be fixed to the coupling portion 132b in the circumferential direction via the spline. The shaft 60b may be provided with a shaft spline, and the plurality of second brake discs 512b may be fixed to the shaft 60b in the circumferential direction via the shaft spline.

[0108] refer to Fig.13 In the third modification of the present disclosure, the hydraulic motor 100c may include a front cover 23, which seals the front end of the housing 10c. In this way, dust can be prevented from entering the interior of the hydraulic motor 100c from the front end of the housing 10c, further improving the sealing performance.

[0109] 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.

[0110] refer to Fig.13 and Fig.14The cylinder body 30c of the hydraulic motor 100c is rotatably accommodated by the housing 10, and the cylinder body 30c is provided with a plurality of first connection holes 303, 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 303 to allow an external fastener passing through the front end cover through hole 233 and the first connection hole 303 to drivably connect the cylinder body 30c to a torque input member of an external device.

[0111] 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 can not affect the cylinder body 30c output torque.

[0112] Continue to refer Fig.13 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 30c to extend into the first connecting hole 303. 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 303.

[0113] refer to Fig.13 , the hydraulic motor 100c further includes an internal fastener, the cylinder body 30c is further provided with a plurality of second connection holes 304, the front end cover 23 is provided with a plurality of third connection holes 234, and each internal fastener is inserted into the corresponding second connection hole 304 and the corresponding third connection hole 234 to drive the front end cover 23 and the cylinder body 30c together. The front end face of the front end cover 23 is configured to press against the rear end face of the torque input member to transmit torque through the friction between the two. In this implementation, during the torque transmission process, a portion of the torque is transmitted through the friction between the two end faces, thereby reducing the stress on the external fastener, which is conducive to reducing the risk of accidental damage to the external fastener.

[0114] In some other examples, reference Fig.16 The thickness of the front end cover 23d can be increased so that the front end cover 23d is not easily damaged when the friction force between the two end faces transmits part of the torque.

[0115] Further, refer to Fig.16 The rear side of the front cover 23e may also be provided with a protruding stopper 234, which extends into the inner circumference of the cylinder body. By utilizing a portion of the inner circumference of the cylinder body 30e, the front cover 23 and the cylinder body 30e have a larger contact area, which helps to stabilize the connection between the front cover 23e and the cylinder body 30e.

[0116] refer to Fig.15In the modification 4 of the present disclosure, the hydraulic motor 100d is similar to the hydraulic motor 100b in the modification 2, except that the hydraulic motor 100d further includes a front cover 23d, and the front cover 23d closes the front end of the housing 10d. The cylinder body 30d is provided with a plurality of first connecting holes 303, and the front cover 23 is provided with a plurality of front cover through holes 233. The technical features of the hydraulic motor 100d that are different from the hydraulic motor 100b in the modification 2 have their corresponding technical effects already introduced in the previous text, and will not be repeated here.

[0117] Exemplary Work Machines

[0118] 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.11 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 or hydraulic motor 100e) mentioned in the above aspect.

[0119] 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.

[0120] 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.

[0121] 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".

[0122] 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 thickened portion and a second thickened portion, these elements are not defined by these terms, which are only used to distinguish one element from another.

[0123] 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: It includes a rear shell, a distributor and a brake piston. The inner circumference of the rear shell is provided with a wall portion, and the wall portion divides the internal space of the rear shell into a front receiving chamber and a rear receiving chamber. The distributor is received in the front receiving chamber, and the brake piston is received in the rear receiving chamber.

2. The radial piston hydraulic motor according to claim 1, characterized in that: It also includes positioning pins, and the distributor is fixed to the wall portion in the circumferential direction through the positioning pins.

3. The radial piston hydraulic motor according to claim 1, characterized in that: It also includes an elastic member located between the wall portion and the distributor, and the elastic member presses the distributor forward.

4. The radial piston hydraulic motor according to claim 2 or 3, characterized in that: The wall portion includes a first thickened portion protruding backwards, and a first avoidance recess is provided at the front side of the brake piston, and the first avoidance recess is directly opposite to the first thickened portion to avoid the first thickened portion.

5. The radial piston hydraulic motor according to claim 1, characterized in that: The rear housing further comprises a shaft, and the rear housing further comprises a coupling portion, which is formed at the inner end of the partition wall portion and extends forward, and the coupling portion surrounds the shaft and is fixedly coupled to or integrally formed with the shaft.

6. The radial piston hydraulic motor according to claim 5, characterized in that: It also includes a brake disc group and a brake pin, the brake disc group is located on the front side of the coupling part, the coupling part is provided with a through hole which penetrates in the front-to-back direction, the rear end of the brake pin is fixed to the brake piston and the front end extends out of the front side of the coupling part through the through hole, so that the brake pin tightens or loosens the brake disc group as the brake piston moves axially.

7. The radial piston hydraulic motor according to claim 6, characterized in that: The brake piston is provided with a receiving groove for receiving the rear end of the brake pin and an exhaust hole communicated with the receiving groove.

8. The radial piston hydraulic motor according to claim 6, characterized in that: The brake piston includes a second thickened portion protruding forward, the brake pin is fixed to the second thickened portion, and a second avoidance recess is provided on the overall rear side of the inner ring portion of the joint portion and the partition wall portion, and the second avoidance recess is directly opposite to the second thickened portion to avoid the second thickened portion.

9. The radial piston hydraulic motor according to claim 8, characterized in that: The inner ring portion protrudes forward, and a third avoidance recess is provided on the front side of the distributor, and the third avoidance recess is directly opposite to the inner ring portion to avoid the inner ring portion.

10. The radial piston hydraulic motor according to claim 5, characterized in that: It also includes a support ring, a first retaining ring fixed to the coupling part, and a second retaining ring fixed to the shaft. The inner periphery of the coupling part is provided with a supporting part, and the shaft is provided with a shaft shoulder. The support ring abuts against the abutting part and against the first retaining ring to be axially fixed to the coupling part; the support ring abuts against the shaft shoulder and against the second retaining ring to be axially fixed to the shaft.

11. The radial piston hydraulic motor according to claim 10, characterized in that: An inner circumference of the coupling portion is provided with an inner spline, and an outer circumference of the shaft is provided with an outer spline. The inner spline is combined with the outer spline to fix the shaft to the coupling portion in a circumferential direction.

12. The radial piston hydraulic motor according to claim 1, characterized in that: It also includes a shaft and a brake disc group, and the rear housing also includes a coupling portion, which is formed at the inner end of the partition wall portion and extends forward, and the coupling portion surrounds the shaft, and a plurality of first brake discs are fixed to the coupling portion in the circumferential direction, and a 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 placed between the coupling portion and the shaft.

13. The radial piston hydraulic motor according to claim 1, characterized in that: The inner circumference of the rear shell is provided with a plurality of inner mating surfaces, which are spaced apart along the direction from front to back and the inner diameters decrease successively, and an inner annular groove is provided between any two adjacent inner mating surfaces; the outer circumference of the distributor is provided with a plurality of outer mating surfaces, which are spaced apart along the direction from front to back and the inner diameters decrease successively, and an outer annular groove is provided between any two adjacent outer mating surfaces; the plurality of inner mating surfaces are respectively tightly fitted with the plurality of outer mating surfaces to connect each inner annular groove with a corresponding outer annular groove.

14. The radial piston hydraulic motor according to claim 1, characterized in that: It also includes a front shell and a first fastener, one of the front shell and the rear shell is provided with a necked portion and the other is provided with a flared portion, the flared portion surrounds the necked portion, and the first fastener passes through the flared portion and is connected to the necked portion to fasten the front shell to the rear shell.

15. The radial piston hydraulic motor according to claim 1, characterized in that: It also includes an end cover and a second fastener, wherein the end cover is located at the rear side of the rear shell, and the second fastener passes through the end cover and is connected to the rear shell to fasten the end cover to the rear shell.

16. The radial piston hydraulic motor according to claim 1, characterized in that: It also includes a front housing and a cylinder body, wherein the cylinder body is accommodated in the front housing and the rear housing assembled together, the inner circumference of the front housing 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 an external device to output torque.

17. A working machine, characterized in that: It comprises a radial piston hydraulic motor according to any one of claims 1 to 16.

Images