Radial piston motor

Abstract

The utility model discloses a radial plunger motor which comprises an output shaft which comprises a shaft body and a load connecting part integrally formed with the shaft body. The front shell is in sealed connection with the load connecting part, and a first bearing and a second bearing are arranged between the front shell and the shaft body; the friction pair is arranged between the front shell and the shaft body, and the friction pair is located between the first bearing and the second bearing; wherein the orthographic projection of the load connecting part on the peripheral surface of the motor is A, the orthographic projection of the friction pair on the peripheral surface of the motor is B, and the orthographic projection B covers the orthographic projection A. The friction pair is arranged between the first bearing and the second bearing, and the load connecting part is arranged at the position opposite to the friction pair, so that on one hand, the bearing capacity and the braking rigidity of the motor are improved, on the other hand, the space between the first bearing and the second bearing can be fully utilized, and the space utilization rate in the motor is improved; and the compactness of the motor structure is improved.

Description

Technical Field

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

[0002] Radial piston motors usually use hydraulic oil as the working medium, and use the hydraulic oil to drive the piston to reciprocate. Radial piston motors are widely used in various hydraulic equipment due to their good low-speed stability, large starting torque and high power. They are one of the core components of excavators, road construction equipment, etc.

[0003] At present, the braking of the existing radial piston motor mainly uses a friction pair to generate a braking torque to brake the output shaft. The output shaft is provided with two bearings (referred to as bearing one and bearing two, bearing one is located in front of bearing two), and the friction pair is usually arranged on the rear side of bearing two. In this structure, since the output shaft is mainly prevented from rotating by the friction plate during braking, and the friction plate is located near the end of the output shaft, the force point of the output shaft is biased to one end. After long-term use, the motor output shaft is prone to deformation. In addition, with this existing structure, the load-bearing capacity of the motor needs to be improved. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing radial piston motor has the technical problems that the output shaft is easy to deform and the bearing capacity is insufficient.

[0005] To this end, the utility model provides a radial piston motor, which can improve the load-bearing capacity and braking rigidity of the motor.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a radial piston motor, comprising: an output shaft, the output shaft comprising: a shaft body and a load connecting part integrally formed with the shaft body; a front housing, the front housing is sealed and connected to the load connecting part, and a first bearing and a second bearing are provided between the front housing and the shaft body; a friction pair, the friction pair is provided between the front housing and the shaft body, and the friction pair is located between the first bearing and the second bearing; wherein the orthographic projection of the load connecting part on the outer peripheral surface of the motor is A, and the orthographic projection of the friction pair on the outer peripheral surface of the motor is B, and the orthographic projection B covers the orthographic projection A.

[0007] Furthermore, the radial center line of the load connection portion is C, the vertical distance between the first bearing and the center line C is a, the vertical distance between the second bearing and the center line C is b, and 6mm≤ab≤7mm.

[0008] Furthermore, the front shell includes: a connecting plate, the connecting plate is sleeved on the shaft body, the front side of the connecting plate is provided with a first mounting portion, the rear side of the connecting plate is provided with a second mounting portion and a third mounting portion, and the third mounting portion is located on the inner side of the second mounting portion.

[0009] Furthermore, the friction pair is arranged between the first mounting portion and the shaft body, and the second bearing is arranged between the third mounting portion and the shaft body.

[0010] Furthermore, it also includes: a piston, a piston column, a disc spring and a support, wherein the piston, the disc spring and the support are arranged between the second mounting part and the third mounting part from front to back in sequence, the piston column passes through the connecting plate, and the rear end of the piston column is in contact with the piston.

[0011] Furthermore, a brake oil passage is provided on the second mounting portion, an oil chamber is formed between the piston and the connecting plate, and the brake oil passage is communicated with the oil chamber.

[0012] Furthermore, a support plate is provided at the front end of the front shell, the first bearing is provided between the support plate and the shaft body, and the friction pair is located between the support plate and the connecting plate.

[0013] Furthermore, an adjustment ring is provided between the friction pair and the connecting plate.

[0014] Furthermore, it also includes: a stator, a rotor and a rear housing assembly, the rotor is located inside the stator, the rotor is connected to the rear end of the shaft, the rear housing assembly is connected to the stator, and the stator is located between the front housing and the rear housing assemblies.

[0015] Furthermore, a sealing assembly is provided between the front housing and the load connecting portion.

[0016] Furthermore, the friction pair includes: a plurality of steel plates and a plurality of friction plates, the steel plates are connected to the front housing, the friction plates are connected to the shaft body, and the steel plates and the friction plates are arranged at intervals.

[0017] The beneficial effects of the utility model are:

[0018] By arranging the friction pair between the first bearing and the second bearing and arranging the load connection part at a position opposite to the friction pair, on the one hand, it is beneficial to improve the load-bearing capacity and braking rigidity of the motor; on the other hand, it can make full use of the space between the first bearing and the second bearing, improve the space utilization inside the motor, and help improve the compactness of the motor structure.

[0019] By improving the structure of the front shell, the internal layout of the motor is made more compact, the space inside the motor is fully utilized, and there is basically no wasted space, which can significantly improve the compactness of the motor structure and is also beneficial to improving the overall rigidity of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a three-dimensional schematic diagram of the radial piston motor of the utility model.

[0022] Figure 2 It is a cross-sectional view of the radial piston motor of the present utility model.

[0023] Figure 3 It is a cross-sectional view of the radial piston motor (with the rear housing assembly hidden) of the present utility model.

[0024] Figure 4 It is a structural schematic diagram of the brake oil channel of the utility model.

[0025] Figure 5 It is a three-dimensional schematic diagram of the front shell of the utility model.

[0026] Figure 6 It is a cross-sectional view of the front housing of the present utility model.

[0027] In the figure: 1, output shaft; 2, front housing; 3, first bearing; 4, second bearing; 5, friction pair; 6, piston; 7, piston rod; 8, disc spring; 9, support; 10, oil chamber; 11, adjustment ring; 12, stator; 13, rotor; 14, rear housing assembly; 15, sealing assembly; 101, shaft body; 102, load connecting part; 201, connecting plate; 202, first mounting part; 203, second mounting part; 204, third mounting part; 205, support plate; 2031, brake oil channel; 121, brake oil inlet channel; 141, rear housing; 142, distribution valve; 151, first sealing ring; 152, first sealing ring; 153, second sealing ring; 154, second sealing ring. DETAILED DESCRIPTION

[0028] 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.

[0029] In the description of the present utility model, it is necessary to understand 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 such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0030] 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.

[0031] like Figures 1 to 6 As shown, the radial piston motor of the utility model comprises: an output shaft 1, a front housing 2 and a friction pair 5, the output shaft 1 comprises: a shaft body 101 and a load connecting portion 102 integrally formed with the shaft body 101, the front housing 2 is sealedly connected to the load connecting portion 102, a first bearing 3 and a second bearing 4 are provided between the front housing 2 and the shaft body 101, the friction pair 5 is provided between the front housing 2 and the shaft body 101, and the friction pair 5 is located between the first bearing 3 and the second bearing 4, wherein the orthographic projection of the load connecting portion 102 on the outer peripheral surface of the motor is A, the orthographic projection of the friction pair 5 on the outer peripheral surface of the motor is B, and the orthographic projection B covers the orthographic projection A.

[0032] That is to say, the utility model improves the structure of the radial piston motor, arranges the friction pair 5 between the first bearing 3 and the second bearing 4, and arranges the load connection part 102 at a position opposite to the friction pair 5. On the one hand, it is beneficial to improve the load-bearing capacity and braking rigidity of the motor. On the other hand, it can make full use of the space between the first bearing 3 and the second bearing 4, improve the space utilization inside the motor, and help improve the compactness of the motor structure.

[0033] It should be noted that the load is fixedly connected to the load connection part 102, and when the output shaft 1 rotates, it can drive the load to rotate synchronously. The first bearing 3 is located at the front end of the shaft body 101, and the second bearing 4 is located at the rear end of the shaft body 101. The bearings can bear the axial and radial loads of the motor. The first bearing 3 and the second bearing 4 are respectively located at the two ends of the shaft body 101 (that is, the distance between the two bearings is elongated), which can improve the load-bearing capacity of the motor.

[0034] Moreover, the friction pair 5 is arranged at a position close to the center line between the first bearing 3 and the second bearing 4, which can not only make full use of the space between the first bearing 3 and the second bearing 4, but also improve the braking rigidity, so that the motor output shaft is not easily deformed. For example, the friction pair 5 includes: a plurality of steel plates and a plurality of friction plates, the steel plates are connected to the front housing 2, the friction plates are connected to the shaft body 101, and the steel plates and the friction plates are arranged at intervals. For example, the friction pair 5 includes seventeen groups of friction plate groups (one group includes a steel plate and a friction plate), and the more friction plate groups there are, the greater the braking torque. However, in the existing radial piston motor structure, increasing the number of friction plate groups will increase the axial size of the motor. The utility model arranges the friction pair 5 between the first bearing 3 and the second bearing 4, and even if the number of friction plate groups is increased, it will basically have no effect on the axial size of the motor.

[0035] For example, in one embodiment, the radial center line of the load connection part 102 is C, the vertical distance between the first bearing 3 and the center line C is a, the vertical distance between the second bearing 4 and the center line C is b, and 6mm≤ab≤7mm. That is, the load connection part 102 is located near the middle between the first bearing 3 and the second bearing 4. In this way, the load-bearing capacity of the motor can be further improved.

[0036] Specifically, the front housing 2 includes a connecting plate 201, which is sleeved on the shaft body 101, a first mounting portion 202 is provided on the front side of the connecting plate 201, a second mounting portion 203 and a third mounting portion 204 are provided on the rear side of the connecting plate 201, and the third mounting portion 204 is located inside the second mounting portion 203. For example, the first mounting portion 202, the second mounting portion 203, and the third mounting portion 204 are all annular. A support plate 205 is provided at the front end of the front housing 2, the first bearing 3 is provided between the support plate 205 and the shaft body 101, and the friction pair 5 is located between the support plate 205 and the connecting plate 201.

[0037] For example, the radial piston motor further includes: a piston 6, a piston column 7, a disc spring 8 and a support 9. The piston 6, the disc spring 8 and the support 9 are arranged in sequence from front to back between the second mounting portion 203 and the third mounting portion 204. The piston column 7 passes through the connecting plate 201, and the rear end of the piston column 7 fits with the piston 6. The friction pair 5 is arranged between the first mounting portion 202 and the shaft body 101, and the second bearing 4 is arranged between the third mounting portion 204 and the shaft body 101. For example, a circular groove for mounting the piston column 7 is provided on the front end surface of the piston 6. The rear end of the piston column 7 is embedded in the circular groove and fits with the piston 6, and no screws or other connecting parts are required between the two. When the piston 6 moves forward under the action of the disc spring 8, it can push the piston column 7 forward; when the piston 6 is pushed backward by the hydraulic oil, the piston column 7 can move backward together. It should be noted that the piston 6, piston column 7, disc spring 8 and support 9 serve as a brake assembly, the support 9 is fixedly connected to the second mounting portion 203, and the brake assembly is relative to the second bearing 4, that is, the orthographic projection of the brake assembly on the outer peripheral surface of the motor basically overlaps or completely overlaps with the orthographic projection of the second bearing 4 on the outer peripheral surface of the motor.

[0038] In addition, compared with the existing conventional braking structure (which uses a piston to directly press on the friction pair, and the front housing of this structure needs to be divided into at least two parts), the utility model adopts a combination of piston 6 and piston column 7, so that the front housing 2 can be made into a whole, which can simplify the processing and forming process of the front housing 2.

[0039] That is to say, the utility model makes the internal layout of the motor more compact by improving the structure of the front shell 2, and fully utilizes the space inside the motor with basically no wasted space, which can significantly improve the compactness of the motor structure and is also beneficial to improving the overall rigidity of the motor.

[0040] For example, the radial piston motor further includes: a stator 12, a rotor 13 and a rear housing assembly 14, wherein the rotor 13 is located inside the stator 12, the rotor 13 is connected to the rear end of the shaft body 101, the rear housing assembly 14 is connected to the stator 12, the stator 12 is located between the front housing 2 and the rear housing assembly 14, and a plunger assembly is provided between the rotor 13 and the stator 12. The rear housing assembly 14 includes a rear housing 141 and a flow distribution valve 142, and when hydraulic oil is introduced, the hydraulic oil passes through the flow distribution valve 142 and enters the inner cavity formed by the rotor 13 and the plunger assembly to push the plunger assembly to extend or retract along the inner curve of the stator 12, so that the rotor 13 can rotate, thereby driving the shaft body 101 to rotate.

[0041] For example, a brake oil passage 2031 is provided on the second mounting portion 203, and an oil chamber 10 is formed between the piston 6 and the connecting plate 201, and the brake oil passage 2031 is connected to the oil chamber 10. A brake oil inlet passage 121 is provided on the stator 12, and the front end of the brake oil inlet passage 121 is connected to the brake oil passage 2031, and the rear end of the brake oil inlet passage 121 is connected to the brake oil port. When hydraulic oil is introduced into the brake oil passage 2031, the oil chamber 10 is filled with hydraulic oil. Under the action of the hydraulic oil, the piston 6 moves backward, and the disc spring 8 is compressed at this time. When the piston 6 moves backward, it drives the piston column 7 to move backward together, so that the front end of the piston column 7 does not abut against the friction pair 5, the steel plate and the friction plate are separated, and the friction plate can rotate synchronously with the shaft body 101. When braking is required, the brake oil channel 2031 is blocked, and the piston 6 moves forward under the action of the disc spring 8. The piston 6 drives the piston column 7 to move forward together. The front end of the piston column 7 presses against the friction pair 5, so that the steel plate and the friction plate are pressed together to generate a braking torque, and the shaft 101 can no longer rotate, thereby achieving motor braking.

[0042] For example, an adjustment ring 11 is provided between the friction pair 5 and the connecting plate 201. A step surface is provided at the connection between the first mounting portion 202 and the connecting plate 201. The adjustment ring 11 is annular, and the outer diameter of the adjustment ring 11 matches the inner diameter of the step surface. Most of the adjustment ring 11 is located in the step surface, so that the adjustment ring 11 has a certain supporting force. It should be noted that in the present embodiment, the number of piston columns 7 is three, which are evenly distributed along the circumference of the piston 6. If the adjustment ring 11 is not provided, the three piston columns 7 directly act on the friction pair 5, which will cause the force points on the friction pair 5 to be relatively concentrated. The adjustment ring 11 can evenly balance the force of the piston column 7 on the friction pair 5, thereby improving the braking effect. When the piston column 7 presses the friction pair 5, the piston column 7 is against the adjustment ring 11, which is also conducive to protecting the friction pair 5 and extending the service life of the friction pair 5.

[0043] For example, a sealing assembly 15 is provided between the front housing 2 and the load connection part 102. Since there are dirt (such as dust, muddy water, etc.) in the application scenario of the motor, the sealing assembly 15 can prevent external contaminants from entering the interior of the motor. The sealing assembly 15 includes: a first sealing ring 151, a first sealing ring 152, a second sealing ring 153 and a second sealing ring 154. The first sealing ring 151 and the first sealing ring 152 are both assembled with the load connection part 102, and the second sealing ring 153 and the second sealing ring 154 are both assembled with the front housing 2. When the output shaft 1 rotates, the first sealing ring 151 and the first sealing ring 152 will rotate synchronously with the output shaft 1. Among them, the first sealing ring 152 and the second sealing ring 154 are abutted against each other. As the motor works, the hydraulic oil inside the motor will form an oil film between the first sealing ring 152 and the second sealing ring 154 to achieve sealing. In addition to playing a sealing role, the sealing assembly 15 of the utility model also has a certain floating space to adapt to the rotation of the output shaft 1.

[0044] Motor working principle:

[0045] When the motor is working normally, low-pressure oil is first injected into the brake oil port, and the piston 6 drives the piston rod 7 to move backward under the action of the low-pressure oil, so that the steel plate and the friction plate can be disengaged. At this time, high-pressure oil is injected into the rear housing assembly 14, and the rotation of the rotor 13 can drive the output shaft 1 to rotate synchronously.

[0046] During braking, the rear housing assembly 14 stops supplying high-pressure oil first, at which point the rotor 13 gradually stops rotating, and the output shaft 1 also gradually stops rotating. After the output shaft 1 stops rotating, the brake oil port stops supplying low-pressure oil, at which point the piston 6 drives the piston rod 7 forward under the action of the disc spring 8 to press the friction pair 5, and the output shaft 1 is subjected to the braking torque to achieve parking braking.

[0047] In summary, the radial piston motor of the utility model sets the friction pair 5 between the first bearing 3 and the second bearing 4, and sets the load connection part 102 at a position opposite to the friction pair 5. On the one hand, it is beneficial to improve the load-bearing capacity and braking rigidity of the motor, and on the other hand, it can make full use of the space between the first bearing 3 and the second bearing 4, improve the space utilization rate inside the motor, and help improve the compactness of the motor structure. By improving the structure of the front housing 2, the layout inside the motor is more compact, the space inside the motor is fully utilized, and there is basically no wasted space, which can significantly improve the compactness of the motor structure and is also beneficial to improve the overall rigidity of the motor.

[0048] 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, and its technical scope must be determined according to the scope of the claims.

Claims

1. A radial piston motor, characterized in that: include: An output shaft (1), the output shaft (1) comprising: a shaft body (101) and a load connection portion (102) integrally formed with the shaft body (101); A front housing (2), the front housing (2) being sealedly connected to the load connection portion (102), and a first bearing (3) and a second bearing (4) being provided between the front housing (2) and the shaft body (101); A friction pair (5), the friction pair (5) being arranged between the front housing (2) and the shaft body (101), and the friction pair (5) being located between the first bearing (3) and the second bearing (4); The orthographic projection of the load connection part (102) on the outer peripheral surface of the motor is A, and the orthographic projection of the friction pair (5) on the outer peripheral surface of the motor is B, and the orthographic projection B covers the orthographic projection A.

2. The radial piston motor according to claim 1, characterized in that: The radial center line of the load connection part (102) is C, the vertical distance between the first bearing (3) and the center line C is a, and the vertical distance between the second bearing (4) and the center line C is b, 6mm≤ab≤7mm.

3. The radial piston motor according to claim 1, characterized in that: The front housing (2) comprises: a connecting plate (201), the connecting plate (201) being sleeved on the shaft body (101), the front side of the connecting plate (201) being provided with a first mounting portion (202), the rear side of the connecting plate (201) being provided with a second mounting portion (203) and a third mounting portion (204), the third mounting portion (204) being located on the inner side of the second mounting portion (203).

4. The radial piston motor according to claim 3, characterized in that: The friction pair (5) is arranged between the first mounting portion (202) and the shaft body (101), and the second bearing (4) is arranged between the third mounting portion (204) and the shaft body (101).

5. The radial piston motor according to claim 3, characterized in that: Also includes: A piston (6), a piston column (7), a disc spring (8) and a support (9), wherein the piston (6), the disc spring (8) and the support (9) are arranged in sequence from front to back between the second mounting portion (203) and the third mounting portion (204), the piston column (7) passes through the connecting plate (201), and the rear end of the piston column (7) is in contact with the piston (6).

6. The radial piston motor according to claim 5, characterized in that: A brake oil passage (2031) is provided on the second mounting portion (203), an oil chamber (10) is formed between the piston (6) and the connecting plate (201), and the brake oil passage (2031) is in communication with the oil chamber (10).

7. The radial piston motor according to claim 3, characterized in that: A support plate (205) is provided at the front end of the front housing (2); the first bearing (3) is provided between the support plate (205) and the shaft body (101); and the friction pair (5) is located between the support plate (205) and the connecting plate (201).

8. The radial piston motor according to claim 7, characterized in that: An adjustment ring (11) is provided between the friction pair (5) and the connecting plate (201).

9. The radial piston motor according to claim 1, characterized in that: Also includes: A stator (12), a rotor (13) and a rear housing assembly (14), wherein the rotor (13) is located inside the stator (12), the rotor (13) is connected to the rear end of the shaft (101), the rear housing assembly (14) is connected to the stator (12), and the stator (12) is located between the front housing (2) and the rear housing assembly (14).

10. The radial piston motor according to claim 1, characterized in that: A sealing assembly (15) is provided between the front housing (2) and the load connecting portion (102).

11. The radial piston motor according to claim 1, characterized in that: The friction pair (5) comprises: a plurality of steel plates and a plurality of friction plates, the steel plates are connected to the front housing (2), the friction plates are connected to the shaft (101), and the steel plates and the friction plates are arranged at intervals.

Images