Radial piston motor with braking function

Abstract

The utility model discloses a radial plunger motor with a braking function, which comprises an output flange shaft, a fixed shell rotationally connected with the output flange shaft, and a braking cylinder connected with the output flange shaft, the friction plate set is located between the fixed shell and the brake cylinder body, static friction plates in the friction plate set are connected with the fixed shell, and dynamic friction plates in the friction plate set are connected with the brake cylinder body; and the double-piston assembly is arranged in the fixed shell and located on one side of the friction plate set, and the double-piston assembly can be used for braking the brake cylinder body. Through the structural improvement, on one hand, the overall compactness of the motor can be improved, and the axial size is reduced, so that the motor can be suitable for a scene with a smaller installation space; on the other hand, the double-piston structure is adopted, the acting area can be increased, the acting force can be increased, and therefore the larger braking torque can be obtained under the condition of the same radial size; and the opening pressure of brake release can also be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger motors, in particular to a radial plunger motor with a braking function. Background Art

[0002] A hydraulic motor is an actuator in a hydraulic system, used to convert the liquid pressure provided by a hydraulic pump into mechanical energy (torque and speed) of the output shaft. Among them, the inner curve hydraulic motor is a multi-acting radial piston motor, referred to as a radial piston motor, with the main features of large output torque, good low-speed stability, and can be directly connected to the working mechanism.

[0003] At present, in order to achieve the braking of the radial piston motor, the brake is generally connected to the radial piston motor, and the brake output shaft is braked by the brake, so as to achieve the braking of the output flange shaft, and one end of the brake output shaft is connected to the output flange shaft. This braking structure will cause the overall axial size of the radial piston motor to be larger, which is not suitable for use in some scenes with smaller spaces. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to improve the structural compactness of the radial piston motor.

[0005] To this end, the utility model provides a radial piston motor with a braking function, which can improve the compactness of the radial piston motor through structural improvement.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a radial piston motor with a braking function, comprising: an output flange shaft, and a fixed housing, the fixed housing is rotatably connected to the output flange shaft, a brake cylinder body, the brake cylinder body is connected to the output flange shaft; a friction plate group, the friction plate group is located between the fixed housing and the brake cylinder body, the static friction plates in the friction plate group are connected to the fixed housing, and the dynamic friction plates in the friction plate group are connected to the brake cylinder body; a double piston assembly, the double piston assembly is arranged in the fixed housing and is located on one side of the friction plate group, and the double piston assembly can be used for braking the brake cylinder body.

[0007] Furthermore, the brake cylinder body comprises: an extension portion and a connection portion, the dynamic friction plate in the friction plate group is mounted on the extension portion, and the connection portion is connected to the output flange shaft.

[0008] Furthermore, it also includes: a bearing cylinder body, the bearing cylinder body is sleeved on the output flange shaft, the bearing cylinder body is located in the fixed shell, and the double-piston assembly is located between the fixed shell and the bearing cylinder body.

[0009] Furthermore, the dual-piston assembly includes: a primary piston, a secondary piston and a piston column, the primary piston is sleeved on the bearing cylinder, one end of the piston column is connected to the primary piston, and the other end of the piston column passes through the secondary piston.

[0010] Furthermore, the dual-piston assembly also includes: a fixing ring and a supporting ring, both of which are mounted on the bearing cylinder body, the fixing ring is located between the primary piston and the secondary piston, the supporting ring is located on the side of the fixing ring away from the primary piston, and the other end of the piston column passes through the fixing ring and the supporting ring.

[0011] Furthermore, a receiving chamber is formed between the fixing ring and the supporting ring, the secondary piston is located in the receiving chamber, and the secondary piston divides the receiving chamber into a left chamber and a right chamber.

[0012] Furthermore, an oil inlet channel is provided on the fixed shell, and a first channel, a second channel and a third channel are opened on the piston column. The first channel is connected to the oil inlet channel, one end of the second channel is connected to the first channel, the other end of the second channel is connected to the third channel, and the third channel is connected to the right chamber.

[0013] Furthermore, the double-piston assembly also includes: a disc spring, which is located on a side of the primary piston away from the piston column, and two sides of the disc spring are respectively in contact with the bearing cylinder body and the primary piston.

[0014] Furthermore, a first sealing ring is provided between the extending portion and the fixed housing, and a second sealing ring is provided between the extending portion and the bearing cylinder.

[0015] Furthermore, the bearing cylinder and the output flange shaft are connected via a bearing assembly.

[0016] Furthermore, an insertion key is provided between the bearing cylinder and the fixed shell, and a retaining spring is provided on the fixed shell, and the retaining spring abuts against the left side of the insertion key.

[0017] Furthermore, an oil seal is provided between the bearing cylinder and the output flange shaft.

[0018] The beneficial effect of the utility model is that when the motor is working, the brake cylinder body, as a power output element, can drive the output flange shaft to rotate. During braking, the double piston assembly presses the friction plate group so that the friction plate group generates a braking torque to brake the brake cylinder body, thereby achieving braking of the output flange shaft. The utility model uses the brake cylinder body as a direct braking object, which can save the installation of components such as a linkage shaft and a brake output shaft inside the motor, which is beneficial to improving the compactness of the motor structure. At the same time, the use of a double piston assembly can obtain a larger effective area, thereby obtaining a larger braking torque under the same radial size conditions; it can also reduce the opening pressure of the brake release. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a cross-sectional view of the radial piston motor of the present utility model.

[0021] Figure 2 It is a partial cross-sectional view of the radial piston motor of the utility model.

[0022] Figure 3 It is a structural schematic diagram of a double piston assembly of the utility model.

[0023] In the figure: 1. output flange shaft; 2. fixed housing; 3. brake cylinder; 4. friction plate group; 5. double piston assembly; 6. load-bearing cylinder; 7. first sealing ring; 8. second sealing ring; 9. bearing assembly; 10. key; 11. retaining ring; 12. oil seal; 13. piston ring; 14. cassette sealing ring; 21. oil inlet channel; 31. extension part; 32. connecting part; 51. primary piston; 52. secondary piston; 53. piston column; 54. fixing ring; 55. supporting ring; 56. left chamber; 57. right chamber; 58. disc spring; 531. first channel; 532. second channel; 533. third channel. DETAILED DESCRIPTION

[0024] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0025] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figures 1 to 3 As shown, the radial piston motor with braking function of the utility model comprises: an output flange shaft 1, a fixed housing 2, a brake cylinder body 3, a friction plate group 4 and a double piston assembly 5, the fixed housing 2 is rotatably connected to the output flange shaft 1, and the brake cylinder body 1 is connected to the output flange shaft 1; the friction plate group 4 is located between the fixed housing 2 and the brake cylinder body 3, the static friction plates in the friction plate group 4 are connected to the fixed housing 2, and the dynamic friction plates in the friction plate group 4 are connected to the brake cylinder body 3; the double piston assembly 5 is arranged in the fixed housing 2 and on one side of the friction plate group 4, and the double piston assembly 5 can be used for braking the brake cylinder body 3.

[0028] When the motor is working, the brake cylinder 3 acts as a power output element, which can drive the output flange shaft 1 to rotate. During braking, the double piston assembly 5 presses the friction plate group 4 so that the friction plate group 4 generates a braking torque to brake the brake cylinder 1, thereby achieving braking of the output flange shaft 1. The utility model uses the brake cylinder 1 as a direct braking object, which can save the installation of components such as a linkage shaft and a brake output shaft inside the motor, which is beneficial to improving the compactness of the motor structure. At the same time, the use of the double piston assembly 5 can obtain a larger effective area, thereby obtaining a larger braking torque under the same radial size conditions; it can also achieve the purpose of reducing the opening pressure of the brake release.

[0029] Specifically, the brake cylinder body 3 includes: an extension portion 31 and a connecting portion 32, the dynamic friction plate in the friction plate group 4 is installed on the extension portion 31, and the connecting portion 32 is connected to the output flange shaft 1. It should be noted that the extension portion 31 extends in the direction where the fixed housing 2 is located, the dynamic friction plate is installed on the extension portion 31, and the static friction plate is installed on the inner wall of the fixed housing 1, and the dynamic friction plate and the static friction plate are arranged at intervals. When the friction plate group 4 is pressed against the double piston assembly 5, the friction force between the static friction plate and the dynamic friction plate increases, the extension portion 31 can no longer rotate, and the braking torque is transmitted from the extension portion 31 to the connecting portion 32, and the connecting portion 32 is then transmitted to the output flange shaft 1. Since the double piston assembly 5 and the friction plate group 4 are located between the two bearings of the bearing assembly 9, the axial size of the motor will not be increased additionally.

[0030] The radial piston motor of the utility model further includes: a bearing cylinder 6, which is sleeved on the output flange shaft 1, the bearing cylinder 6 is located in the fixed housing 2, and the double piston assembly 5 is located between the fixed housing 2 and the bearing cylinder 6. It should be noted that the left end of the bearing cylinder 6 is connected to the fixed housing 2, and the right end of the bearing cylinder 6 extends into the inner side of the extension portion 31. A cavity is formed between the bearing cylinder 6 and the fixed housing 2, and the double piston assembly 5 is located in the cavity.

[0031] Specifically, the dual-piston assembly 5 includes: a primary piston 51, a secondary piston 52, a piston column 53, a fixing ring 54, a support ring 55 and a disc spring 58. The primary piston 51, the fixing ring 54 and the support ring 55 are all sleeved on the bearing cylinder body 6, the secondary piston 52 is sleeved on the support ring 55, one end of the piston column 53 is connected to the primary piston 51, and the other end of the piston column 53 passes through the secondary piston 52. The fixing ring 54 is located between the primary piston 51 and the secondary piston 52, the support ring 55 is located on the side of the fixing ring 54 away from the primary piston 51, the other end of the piston column 53 passes through the fixing ring 54 and the support ring 55, the disc spring 58 is located on the side of the primary piston 51 away from the piston column 53, and the two sides of the disc spring 58 are respectively abutted against the bearing cylinder body 6 and the primary piston 51.

[0032] For example, the left end of the piston column 53 is connected to the primary piston 51, and the right end of the piston column 53 sequentially passes through the fixing ring 54, the secondary piston 52 and the support ring 55. Among them, the positions of the fixing ring 54 and the support ring 55 are fixed, and the primary piston 51, the secondary piston 52 and the piston column 53 can move left or right together. For example, a piston ring 13 is provided between the piston column 53 and the friction plate group 4, which is conducive to protecting the leftmost friction plate.

[0033] For example, a receiving chamber is formed between the fixed ring 54 and the supporting ring 55, and the secondary piston 52 is located in the receiving chamber, and the secondary piston 52 divides the receiving chamber into a left chamber 56 and a right chamber 57. The fixed housing 2 is provided with an oil inlet passage 21, and the piston column 53 is provided with a first passage 531, a second passage 532 and a third passage 533. The first passage 531 is connected to the oil inlet passage 21, one end of the second passage 532 is connected to the first passage 531, and the other end of the second passage 532 is connected to the third passage 533, and the third passage 533 is connected to the right chamber 57. When hydraulic oil is introduced into the oil inlet channel 21, the hydraulic oil can enter the right chamber 57 through the first channel 531, the second channel 532 and the third channel 533. Under the action of the hydraulic oil, the primary piston 51 and the secondary piston 52 are pushed to the left. At this time, the disc spring 58 is compressed. When the primary piston 51 and the secondary piston 52 move to the left, the piston column 53 will be driven to move to the left. The pressing force of the piston column 53 on the friction plate group 4 is gradually reduced, so that the dynamic friction plate and the static friction plate are disengaged, and the braking force is released. Since the hydraulic oil is used on the primary piston 51 and the secondary piston 52 at the same time, the effective area is increased, the force is increased, and then the disc spring 58 with a larger pressure can be selected to obtain a larger braking force under the condition of the same pressure of hydraulic oil. When the hydraulic oil is stopped, the primary piston 51 moves to the right under the action of the restoring force of the disc spring 58, driving the piston column 53 and the secondary piston 52 to move to the right synchronously. The piston column 53 presses the friction plate group 4, generating a braking force, causing the brake cylinder 3 to lock and the motor to stop working.

[0034] For example, a first sealing ring 7 is provided between the extension part 31 and the fixed housing 2, and a second sealing ring 8 is provided between the extension part 31 and the bearing cylinder body 6. The first sealing ring 7 and the second sealing ring 8 can prevent the contaminants generated by the friction plate group 4 from entering the interior of the motor. The bearing cylinder body 6 and the output flange shaft 1 are connected by a bearing assembly 9 (including two bearings). A key 10 is provided between the bearing cylinder body 6 and the fixed housing 2, and a retaining ring 11 is provided on the fixed housing 2, and the retaining ring 11 abuts on the left side of the key 10. In this way, the fixed housing 2 and the bearing cylinder body 3 can be fixed as a whole. An oil seal 12 is also provided between the bearing cylinder body 6 and the output flange shaft 1 to prevent hydraulic oil leakage. The left end oil part of the output flange shaft 1 is partially covered outside the fixed housing 2, which can protect the bearing cylinder body 3. A cassette sealing ring 14 is also provided between the output flange shaft 1 and the outer wall of the fixed housing 2 to prevent external contaminants from entering the interior of the motor.

[0035] To sum up, the radial piston motor of the utility model can, through structural improvement, on the one hand, improve the overall compactness of the motor and reduce the axial size, so that the motor can be suitable for scenarios with smaller installation spaces; on the other hand, the use of a double-piston structure can increase the effective area and force, thereby obtaining a greater braking torque under the same radial size conditions; it can also reduce the opening pressure of the brake release.

[0036] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A radial piston motor with a braking function, characterized in that: include: output flange shaft (1), and A fixed housing (2), the fixed housing (2) being rotatably connected to the output flange shaft (1), A brake cylinder body (3), the brake cylinder body (3) being connected to the output flange shaft (1); A friction plate group (4), the friction plate group (4) being located between the fixed housing (2) and the brake cylinder body (3), the static friction plates in the friction plate group (4) being connected to the fixed housing (2), and the dynamic friction plates in the friction plate group (4) being connected to the brake cylinder body (3); A double piston assembly (5), the double piston assembly (5) being arranged in the fixed housing (2) and located on one side of the friction plate group (4), and the double piston assembly (5) being capable of being used to brake the brake cylinder body (3).

2. The radial piston motor with braking function according to claim 1, characterized in that: The brake cylinder body (3) comprises an extension portion (31) and a connection portion (32), the dynamic friction plate in the friction plate group (4) is mounted on the extension portion (31), and the connection portion (32) is connected to the output flange shaft (1).

3. The radial piston motor with braking function according to claim 2, characterized in that: Also includes: A bearing cylinder (6), wherein the bearing cylinder (6) is sleeved on the output flange shaft (1), the bearing cylinder (6) is located in the fixed housing (2), and the double piston assembly (5) is located between the fixed housing (2) and the bearing cylinder (6).

4. The radial piston motor with braking function according to claim 3, characterized in that: The double piston assembly (5) comprises: a primary piston (51), a secondary piston (52) and a piston column (53); the primary piston (51) is sleeved on the bearing cylinder (6); one end of the piston column (53) is connected to the primary piston (51); and the other end of the piston column (53) passes through the secondary piston (52).

5. The radial piston motor with braking function according to claim 4, characterized in that: The dual-piston assembly (5) further comprises: a fixing ring (54) and a supporting ring (55), wherein the fixing ring (54) and the supporting ring (55) are both sleeved on the bearing cylinder (6), the fixing ring (54) being located between the primary piston (51) and the secondary piston (52), the supporting ring (55) being located on a side of the fixing ring (54) away from the primary piston (51), and the other end of the piston column (53) passing through the fixing ring (54) and the supporting ring (55).

6. The radial piston motor with braking function according to claim 5, characterized in that: A receiving chamber is formed between the fixing ring (54) and the supporting ring (55), the secondary piston (52) is located in the receiving chamber, and the secondary piston (52) divides the receiving chamber into a left chamber (56) and a right chamber (57).

7. The radial piston motor with braking function according to claim 6, characterized in that: The fixed housing (2) is provided with an oil inlet passage (21), and the piston column (53) is provided with a first passage (531), a second passage (532) and a third passage (533); the first passage (531) is connected to the oil inlet passage (21), one end of the second passage (532) is connected to the first passage (531), the other end of the second passage (532) is connected to the third passage (533), and the third passage (533) is connected to the right chamber (57).

8. The radial piston motor with braking function according to claim 4, characterized in that: The double piston assembly (5) further comprises a disc spring (58), wherein the disc spring (58) is located on a side of the primary piston (51) away from the piston column (53), and the two sides of the disc spring (58) are respectively in contact with the bearing cylinder (6) and the primary piston (51).

9. The radial piston motor with braking function according to claim 3, characterized in that: A first sealing ring (7) is provided between the extension portion (31) and the fixed housing (2), and a second sealing ring (8) is provided between the extension portion (31) and the bearing cylinder (6).

10. The radial piston motor with braking function according to claim 3, characterized in that: The bearing cylinder (6) and the output flange shaft (1) are connected via a bearing assembly (9).

11. The radial piston motor with braking function according to claim 3, characterized in that: An insertion key (10) is provided between the bearing cylinder (6) and the fixed housing (2), and a retaining spring (11) is provided on the fixed housing (2), wherein the retaining spring (11) abuts against the left side of the insertion key (10).

12. The radial piston motor with braking function according to claim 3, characterized in that: An oil seal (12) is also provided between the bearing cylinder (6) and the output flange shaft (1).

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