Radial piston motor

Abstract

The utility model discloses a radial plunger motor, comprising a main housing provided with an output shaft; the brake shell is connected with the main shell, the rear end of the output shaft extends into the brake shell, and a hydraulic valve block is installed on the brake shell; a friction plate of the friction pair is connected with the output shaft, and a steel sheet of the friction pair is connected with the inner wall of the brake shell; the piston block is located in the brake shell, and the piston block is located at the rear end of the friction pair; the rear cover is connected with the brake shell; a first oil cavity is formed between the piston block and the brake shell, a second oil cavity is formed between the piston block and the rear cover, and the first oil cavity and the second oil cavity are communicated with the hydraulic valve block. Hydraulic force is adopted to replace elastic force of a disc spring, and the situation that the brake effect is poor due to failure of the disc spring can be avoided. In addition, braking is achieved through hydraulic pressure, and flexible adjustment of braking torque can be achieved by changing the pressure of hydraulic oil.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a radial piston motor. Background Art

[0002] The radial piston motor has good reverse characteristics, making the motor operation absolutely quiet and suitable for servo systems. At present, for the existing radial piston motors applied to slip drives, a friction pair is usually used to brake the output shaft, and the output of the braking force mainly depends on the elastic force of the disc spring. In this way, as the use time prolongs, the elastic force of the disc spring will gradually decay, resulting in the braking torque not meeting the requirements. Summary of the Utility Model

[0003] In order to solve the problems existing in the prior art, the utility model provides a radial piston motor, which uses hydraulic pressure to provide braking force, being beneficial to improving the reliability and stability of braking.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a radial piston motor, comprising: a main housing, the main housing is provided with an output shaft; a brake housing, the brake housing is connected to the main housing, the rear end of the output shaft extends into the brake housing, and a hydraulic valve block is installed on the brake housing; a friction pair, the friction disc of the friction pair is connected to the output shaft, and the steel disc of the friction pair is connected to the inner wall of the brake housing; a piston block, the piston block is located in the brake housing, and the piston block is located at the rear end of the friction pair; a rear cover, the rear cover is connected to the brake housing; wherein, a first oil chamber is formed between the piston block and the brake housing, a second oil chamber is formed between the piston block and the rear cover, and the first oil chamber and the second oil chamber are communicated with the hydraulic valve block.

[0005] Further, a pressing part is provided on the front side of the piston block, and a supporting part is provided at the edge of the piston block. The pressing part is used to press the friction pair during braking, and the supporting part is used to cooperate with the inner wall of the brake housing to form a support.

[0006] Further, a first channel and a second channel are provided on the hydraulic valve block. The first channel is communicated with the first oil chamber, and the second channel is communicated with the second oil chamber.

[0007] Further, a first through hole and a second through hole are opened on the brake housing. The first through hole is communicated with the first channel, and the second through hole is communicated with the second channel.

[0008] Further, the brake housing includes a first side wall, and an oil seal is provided between the first side wall and the pressing part.

[0009] Further, a first sealing ring is embedded on the outer wall of the supporting part.

[0010] Further, a second sealing ring is provided between the rear cover and the brake housing.

[0011] Further, the main housing includes a front housing and a rear housing, and a rotor-stator assembly is provided between the front housing and the rear housing.

[0012] Further, a flow distribution valve is provided in the rear housing.

[0013] Further, a bearing is provided in the front housing.

[0014] The beneficial effect of the present utility model is that through structural improvement, hydraulic pressure is used to replace the elastic force of the disc spring, which can avoid the poor braking effect caused by the failure of the disc spring. Moreover, by using hydraulic pressure to achieve braking, the braking torque can be flexibly adjusted by changing the pressure of the hydraulic oil, and the application range is wider. Description of the Drawings

[0015] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0016] Figure 1 is a three-dimensional schematic diagram of the radial piston motor of the present utility model.

[0017] Figure 2 is a sectional view of the radial piston motor of the present utility model.

[0018] Figure 3 is a schematic diagram of the braking-related components of the present utility model.

[0019] In the figure: 1, main housing; 2, output shaft; 3, brake housing; 4, friction pair; 5, piston block; 6, rear cover; 7, first oil chamber; 8, second oil chamber; 9, oil seal; 10, first sealing ring; 11, second sealing ring; 12, rotor-stator assembly; 13, flow distribution valve; 14, bearing; 101, front housing; 102, rear housing; 31, hydraulic valve block; 311, first channel; 312, second channel; 32, first through hole; 33, second through hole; 34, first side wall; 51, pressing part; 52, supporting part. Detailed Description of the Preferred Embodiments

[0020] The present utility model will now be further described in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] As Figures 1 to 3 shown, the radial piston motor of the present utility model includes: a main housing 1, a brake housing 3, a friction pair 4, piston blocks 5, and a rear cover 6. The main housing 1 is provided with an output shaft 2. The brake housing 3 is connected to the main housing 1. The rear end of the output shaft 2 extends into the brake housing 3. A hydraulic valve block 31 is mounted on the brake housing 3. The friction plates of the friction pair 4 are connected to the output shaft 2, and the steel plates of the friction pair 4 are connected to the inner wall of the brake housing 3. The piston blocks 5 are located in the brake housing 3, and the piston blocks 5 are located at the rear of the friction pair 4. The rear cover 6 is connected to the brake housing 3. Among them, a first oil chamber 7 is formed between the piston blocks 5 and the brake housing 3, a second oil chamber 8 is formed between the piston blocks 5 and the rear cover 6, and the first oil chamber 7 and the second oil chamber 8 are in communication with the hydraulic valve block 31.

[0024] That is to say, the first oil chamber 7 is located in front of the piston blocks 5, and the second oil chamber 8 is located behind the piston blocks 5. When hydraulic oil enters the first oil chamber 7 through the hydraulic valve block 31, the hydraulic pressure pushes the piston blocks 5 backward. At this time, the friction pair 4 will not be subjected to a pressing force, and the output shaft 2 can rotate. When hydraulic oil enters the second oil chamber 8 through the hydraulic valve block 31, the hydraulic pressure pushes the piston blocks 5 forward, causing the piston blocks 5 to press the friction pair 4 to generate a braking torque, so that the output shaft 2 cannot rotate.

[0025] Through structural improvement, the utility model uses hydraulic pressure to replace the elastic force of the disc spring, which can avoid the poor braking effect caused by the failure of the disc spring. Moreover, by using hydraulic pressure to achieve braking, the braking torque can be adjusted by changing the pressure of the hydraulic oil (the disc spring can only achieve a fixed torque), and the application range is wider. In addition, the friction pair 4 and the braking component of the utility model are arranged at the rear end of the output shaft 2, which is convenient for modifying the existing radial piston motor.

[0026] Specifically, a pressing part 51 is provided on the front side of the piston block 5, and a supporting part 52 is provided at the edge of the piston block 5. The pressing part 51 is used to press the friction pair 4 during braking, and the supporting part 52 is used to cooperate with the inner wall of the braking housing 3 to form a support. When hydraulic oil is introduced into the second oil chamber 8, the piston block 5 is pushed forward by the hydraulic pressure. The pressing part 51 contacts the friction pair 4 and applies pressure to the friction pair 4, so that the friction plates and steel plates of the friction pair 4 are closely attached to generate a braking torque. When the piston block 5 moves, the supporting part 52 moves along the inner wall of the braking housing 3.

[0027] Specifically, a first channel 311 and a second channel 312 are provided on the hydraulic valve block 31. The first channel 311 is communicated with the first oil chamber 7, and the second channel 312 is communicated with the second oil chamber 8. A first through hole 32 and a second through hole 33 are formed on the braking housing 3. The first through hole 32 is communicated with the first channel 311, and the second through hole 33 is communicated with the second channel 312. That is to say, the first channel 311, the first through hole 32 and the first oil chamber 7 are communicated with each other, and the second channel 312, the second through hole 33 and the second oil chamber 8 are communicated with each other.

[0028] Specifically, the braking housing 3 includes a first side wall 34, and an oil seal 9 is provided between the first side wall 34 and the pressing part 51. Thus, the first oil chamber 7 becomes a closed chamber. A first sealing ring 10 is embedded on the outer wall of the supporting part 52. The first sealing ring 10 can isolate the first oil chamber 7 and the second oil chamber 8 to prevent the oil fluid between the two chambers from flowing to each other. For example, a second sealing ring 11 is provided between the rear cover 6 and the braking housing 3 to prevent the hydraulic oil in the second oil chamber 8 from leaking.

[0029] For example, the main housing 1 includes a front housing 101 and a rear housing 102, and a rotor-stator assembly 12 is provided between the front housing 101 and the rear housing 102. A flow distribution valve 13 is provided in the rear housing 102. A bearing 14 is provided in the front housing 101. The flow distribution valve 13 is used to distribute the hydraulic oil introduced into the main housing 1. After distribution, the hydraulic oil enters the rotor-stator assembly 12 to drive the rotor to rotate. The rotor is fixedly connected to the output shaft 2, so as to drive the output shaft 2 to rotate. The bearing 14 is used to improve the stability and reliability of the output shaft 2 during rotation.

[0030] The working process is as follows:

[0031] Parking brake: When the output shaft 2 has stopped rotating, the hydraulic pump supplies hydraulic oil to the second oil chamber 8 through the hydraulic valve block 31. The hydraulic oil pushes the piston block 5 forward to press against the friction pair 4 to generate a braking torque, and at this time, the output shaft 2 cannot rotate. The hydraulic pump does not need to continuously supply oil to the second oil chamber 8. The self-locking function of the hydraulic valve block 31 can ensure that the hydraulic pressure does not decay and maintain the braking state.

[0032] Service brake: When the motor is running normally, the hydraulic pump supplies hydraulic oil to the first oil chamber 7 through the hydraulic valve block 31. The hydraulic oil pushes the piston block 5 backward to release the braking force on the output shaft 2, and the output shaft 2 can rotate normally. When service braking is required, the motor is in a running state, the hydraulic pump inputs hydraulic oil into the second oil chamber 8, and the hydraulic oil in the first oil chamber 7 returns to the fuel tank. The piston block 5 moves forward to press against the friction pair 4 to achieve braking of the output shaft 2. The magnitude of the braking force is adjusted by using a controllable hydraulic pressure difference to meet the service braking requirements in different states.

[0033] In summary, for the radial piston motor of the present utility model, through structural improvement, using hydraulic pressure to replace the disc spring can improve the reliability and stability of the braking effect, and can also flexibly adjust the braking force, making it more convenient to use. The braking component is installed at the rear end of the output shaft 2, which is convenient for modifying the existing motor with little change to the internal structure of the motor.

[0034] Taking the above ideal embodiments of the present utility model as inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A radial piston motor, characterized in that: include: A main housing (1), wherein the main housing (1) is provided with an output shaft (2); A brake housing (3), the brake housing (3) being connected to the main housing (1), the rear end of the output shaft (2) extending into the brake housing (3), and a hydraulic valve block (31) being mounted on the brake housing (3); A friction pair (4), wherein the friction plate of the friction pair (4) is connected to the output shaft (2), and the steel plate of the friction pair (4) is connected to the inner wall of the brake housing (3); A piston block (5), the piston block (5) being located in the brake housing (3), and the piston block (5) being located at the rear end of the friction pair (4); A rear cover (6), the rear cover (6) being connected to the brake housing (3); A first oil chamber (7) is formed between the piston block (5) and the brake housing (3), a second oil chamber (8) is formed between the piston block (5) and the rear cover (6), and the first oil chamber (7) and the second oil chamber (8) are connected to the hydraulic valve block (31).

2. The radial piston motor according to claim 1, characterized in that: A clamping portion (51) is provided on the front side of the piston block (5), and a supporting portion (52) is provided at the edge of the piston block (5). The clamping portion (51) is used to clamp the friction pair (4) during braking, and the supporting portion (52) is used to cooperate with the inner wall of the brake housing (3) to form a support.

3. The radial piston motor according to claim 1, characterized in that: The hydraulic valve block (31) is provided with a first channel (311) and a second channel (312); the first channel (311) is connected to the first oil chamber (7), and the second channel (312) is connected to the second oil chamber (8).

4. The radial piston motor according to claim 3, characterized in that: The brake housing (3) is provided with a first through hole (32) and a second through hole (33); the first through hole (32) is connected to the first channel (311), and the second through hole (33) is connected to the second channel (312).

5. The radial piston motor according to claim 2, characterized in that: The brake housing (3) comprises a first side wall (34), and an oil seal (9) is provided between the first side wall (34) and the pressing portion (51).

6. The radial piston motor according to claim 2, characterized in that: A first sealing ring (10) is embedded on the outer wall of the support portion (52).

7. The radial piston motor according to claim 1, characterized in that: A second sealing ring (11) is provided between the rear cover (6) and the brake housing (3).

8. The radial piston motor according to claim 1, characterized in that: The main housing (1) comprises a front housing (101) and a rear housing (102), and a rotor-stator assembly (12) is provided between the front housing (101) and the rear housing (102).

9. The radial piston motor according to claim 8, characterized in that: A flow distribution valve (13) is provided in the rear housing (102).

10. The radial piston motor according to claim 8, characterized in that: A bearing (14) is provided in the front housing (101).

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