Cycloid hydraulic motor with compact structure

Abstract

The utility model discloses a cycloid hydraulic motor with a compact structure, which comprises a shell, a valve plate, a rotor and stator pair and a rear cover which are sequentially arranged from front to back, a flow distribution valve is arranged in the shell, the flow distribution valve is connected with the rotor and stator pair through a first linkage shaft, the first linkage shaft penetrates through the valve plate, the flow distribution valve is further connected with a second linkage shaft, and the second linkage shaft penetrates through the valve plate. The front end of the second linkage shaft penetrates through the shell, and an oil port is formed in the front end face of the shell. The flow distribution valve is arranged on the front side of the rotor and stator pair, the flow distribution valve is matched with the linkage shaft to output torque, the oil port is formed in the front end face of the shell and is in end face sealing with the whole machine, an external oil pipe is not needed, and the radial installation size of the motor can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a cycloid hydraulic motor with a compact structure. Background Art

[0002] A hydraulic motor is an actuator of a hydraulic system, which converts the liquid pressure energy provided by a hydraulic pump into the mechanical energy (torque and speed) of its output shaft. A cycloid hydraulic motor is a type of hydraulic motor. The main structure of an existing cycloid hydraulic motor includes: a front housing, a rotor-stator pair, and a rear cover. The distribution valve is installed in the rear cover, and the oil inlet and outlet are set on the rear cover. The distribution valve is connected to the rotor-stator pair through a linkage shaft, and the rotor-stator pair is connected to the output main shaft through a linkage shaft.

[0003] The existing structure has the following shortcomings:

[0004] When the motor is assembled with the complete equipment (the output spindle is connected to the complete equipment), the oil inlet and outlet ports on the rear cover need to be connected to the oil channels of the complete equipment through longer oil pipes, resulting in a larger radial dimension of the motor as a whole (radial diameter of about 120mm), which cannot be used in small installation spaces (for example, the radial dimension is only 100mm or even smaller). Utility Model Content

[0005] The technical problem to be solved by the utility model is: how to reduce the size of the cycloid hydraulic motor.

[0006] To this end, the utility model provides a cycloid hydraulic motor with a compact structure.

[0007] The utility model adopts the following technical solution to solve the technical problem: a compact cycloid hydraulic motor, comprising: a housing, a distribution plate, a rotor-stator pair and a rear cover arranged in sequence from front to back, a distribution valve is arranged in the housing, the distribution valve is connected to the rotor-stator pair through a first linkage shaft, the first linkage shaft passes through the distribution plate, the distribution valve is also connected to a second linkage shaft, the front end of the second linkage shaft passes through the housing, and an oil port is opened on the front end surface of the housing.

[0008] Furthermore, an oil passage is provided in the shell, and the oil passage is communicated with the oil port.

[0009] Furthermore, a housing cavity is provided in the shell, the distribution valve is located in the housing cavity, and the outer diameter of the rear end of the distribution valve is matched with the diameter of the inner wall of the rear end of the housing cavity.

[0010] Furthermore, a pressure plate is provided in the shell, the pressure plate is in close contact with the front end of the distribution valve, and a spring is provided between the front end of the pressure plate and the shell.

[0011] Furthermore, it also includes: a plurality of first bolts, wherein the first bolts penetrate the shell from front to back and are connected to the distribution plate.

[0012] Furthermore, it also includes: a plurality of second bolts, wherein the second bolts sequentially penetrate the rear cover, the rotor-stator pair and the distribution plate from the back to the front to be connected.

[0013] Furthermore, fastening glue is coated on the threads of the first bolt and the second bolt.

[0014] Furthermore, the eccentricity of the rotor-stator pair is 2.2 to 2.8.

[0015] Furthermore, a sealing ring is provided at the front end of the oil port.

[0016] Furthermore, the pressure plate is provided with a through hole for the circulation of hydraulic oil.

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

[0018] The distribution valve is arranged at the front side of the rotor-stator pair, and the distribution valve cooperates with the linkage shaft to output torque. The oil port is arranged at the front end face of the shell, and the end face is sealed with the whole machine. No external oil pipe is required, which can effectively reduce the radial installation size of the motor.

[0019] The wear on the distribution valve caused by the motor when it is running can be compensated by applying force to the distribution valve through the spring on the pressure plate, which can effectively increase the service life of the distribution system and improve the life of the motor.

[0020] The motor is fastened with bolts and fasteners so that the motor can maintain a good pre-tightening force on the parts under vibration conditions, ensuring the sealing performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a structural schematic diagram of the cycloid hydraulic motor of the utility model.

[0023] Figure 2 It is a structural schematic diagram of the first bolt and the second bolt of the utility model.

[0024] Figure 3 It is a schematic diagram of the front end of the cycloid hydraulic motor of the utility model.

[0025] Figure 4 It is a schematic diagram of the rear end of the cycloid hydraulic motor of the utility model.

[0026] In the figure: 1, housing; 2, distribution plate; 3, rotor-stator pair; 4, rear cover; 5, distribution valve; 6, first linkage shaft; 7, second linkage shaft; 8, pressure plate; 9, spring; 10, first bolt; 11, second bolt; 12, sealing ring; 101, oil port; 102, oil channel; 103, accommodating chamber; 104, flange mounting portion; 105, main body; 1041, mounting hole; 81, through hole. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] like Figures 1 to 4 As shown, the cycloid hydraulic motor of the utility model comprises: a housing 1, a distribution plate 2, a rotor-stator pair 3 and a rear cover 4 which are arranged in sequence from front to back, a distribution valve 5 is arranged in the housing 1, the distribution valve 5 is connected to the rotor-stator pair 3 through a first linkage shaft 6, the first linkage shaft 6 passes through the distribution plate 2, the distribution valve 5 is also connected to a second linkage shaft 7, the front end of the second linkage shaft 7 passes through the housing 1, and an oil port 101 is opened on the front end surface of the housing 1.

[0031] That is to say, in the present invention, the distribution valve 5 is located at the front side of the rotor-stator pair 3, the rear end of the first linkage shaft 6 is connected to the rotor-stator pair 3, the front end of the first linkage shaft 6 is connected to the distribution valve 5, and the rear end of the second linkage shaft 7 is connected to the distribution valve 5. When the motor is working, the rotor of the rotor-stator pair 3 rotates under hydraulic drive, driving the first linkage shaft 6 and the distribution valve 5 to rotate, and the distribution valve 5 then drives the second linkage shaft 7 to rotate and output torque. That is, the distribution valve 5 of the present invention not only plays the role of distribution, but also plays the role of transmitting torque. In addition, the present invention sets the oil port 101 for oil inlet and outlet on the front face of the housing 1. When the motor is assembled with the whole machine, the oil port 101 can be directly aligned with the oil channel of the whole machine, and no oil pipe is needed to communicate; and the distribution valve 5 is set in the housing 1, and the distance to the oil port 101 is close, which can better distribute the flow. The utility model effectively reduces the radial size of the motor by improving the structure and rationally arranging the cycloid hydraulic motor. The radial size can be reduced to 90 mm, which is suitable for scenarios with small installation spaces.

[0032] Specifically, an oil passage 102 is provided in the housing 1, and the oil passage 102 is connected to the oil port 101. An accommodating chamber 103 is provided in the housing 1, and the flow distribution valve 5 is located in the accommodating chamber 103. The outer diameter of the rear end of the flow distribution valve 5 is matched with the diameter of the inner wall of the rear end of the accommodating chamber 103 (for positioning the flow distribution valve 5). The hydraulic oil enters from the oil port 101, passes through the oil passage 102 and reaches the flow distribution valve 5. The flow distribution valve 5 and the flow distribution plate 2 are both provided with flow distribution holes. After the hydraulic oil passes through the flow distribution valve 5 and the flow distribution plate 2, it reaches the rotor-stator pair 3 to drive the rotor to rotate.

[0033] Specifically, a pressure plate 8 is further provided in the housing 1, and the pressure plate 8 is in close contact with the front end of the distribution valve 5, and a spring 9 is provided between the front end of the pressure plate 8 and the housing 1. When the motor is working, the distribution valve 5 will rotate, and the rear end of the distribution valve 5 will be in close contact with the distribution disk 2. After long-term use, the rear end of the distribution valve 5 will cause certain wear. At this time, under the action of the elastic force of the spring 9, the pressure plate 8 will still press the distribution valve 5 onto the distribution disk 2. In other words, the elastic force of the spring 9 can automatically compensate for the gap caused by wear and reduce leakage. For example, a through hole 81 for the circulation of hydraulic oil is provided on the pressure plate 8. The through hole 81 is connected to the distribution hole on the distribution valve 5.

[0034] For example, the eccentricity of the rotor-stator pair 3 is 2.2 to 2.8. Selecting a rotor-stator pair 3 with a smaller eccentricity can further reduce the radial size of the motor.

[0035] In some special scenarios, such as rock drilling machinery and equipment, not only is the installation space small, but also the rock drill will vibrate constantly when working, which can easily loosen the fasteners on the motor, causing the motor seal to fail. Based on this, the utility model improves the fastening structure.

[0036] The cycloid hydraulic motor also includes: a plurality of first bolts 10 and a plurality of second bolts 11. The first bolts 10 penetrate the housing 1 from front to back and are connected to the distribution plate 2. The second bolts 11 penetrate the rear cover 4 and the rotor-stator pair 3 from back to front and are connected to the distribution plate 2. The threads of the first bolts 10 and the second bolts 11 are coated with fastening glue. For example, the number of first bolts 10 is twelve, which are evenly distributed along the circumference of the motor. The number of second bolts 11 is seven, which are evenly distributed along the circumference of the motor. The utility model uses more bolts than the prior art, which can improve the firmness of the overall structure of the motor. Moreover, the first bolts 10 and the second bolts 11 arranged front and back can better connect and fasten the various components of the motor, and can better cope with vibration conditions. In addition, the utility model also coats fastening glue on the threads of the bolts. When the bolts are installed, the fastening glue naturally solidifies to further enhance the fixing effect and ensure the overall structural stability and sealing of the motor.

[0037] For example, the housing 1 includes a flange mounting portion 104 and a main body 105, and the flange mounting portion 104 is integrally formed with the front end of the main body 105. The oil port 101 is provided on the flange mounting portion 104. The flange mounting portion 104 is also provided with a mounting hole 1041 for fixing to the complete equipment. A sealing ring 12 is provided at the front end of the oil port 101 to ensure the sealing between the complete equipment and the oil port 101.

[0038] In summary, the utility model has the following advantages through structural improvement:

[0039] 1. The distribution valve 5 is arranged at the front side of the rotor-stator pair 3. The distribution valve 5 cooperates with the linkage shaft to output torque. The oil port 101 is arranged at the front end face of the housing 1 and is sealed with the end face of the whole machine. No external oil pipe is required, which can effectively reduce the radial installation size of the motor.

[0040] 2. The wear on the distribution valve 5 caused by the operation of the motor can be compensated by applying force to the distribution valve 5 through the pressure plate 8 by the spring 9, which can effectively increase the service life of the distribution system and improve the life of the motor.

[0041] 3. Use a large number of bolts to tighten the seal. At the same time, use tightening glue to tighten the bolts during assembly to ensure that the motor can still maintain a good pre-tightening force on the parts under vibration conditions to ensure the sealing performance of the motor.

[0042] 4. The hydraulic oil leaked from the motor at the stator pair 3 flows through the rotor, distribution plate 2, distribution valve 5, and pressure plate 8, and then flows out from the center hole of the housing 1 to the system. In this process, the parts can be continuously cleaned to prevent the motor from overheating due to long working hours and improve the performance of the product.

[0043] 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 compact cycloid hydraulic motor, characterized in that: include: A housing (1), a distribution plate (2), a rotor-stator pair (3) and a rear cover (4) are arranged in sequence from front to back. A distribution valve (5) is arranged in the housing (1). The distribution valve (5) is connected to the rotor-stator pair (3) via a first linkage shaft (6). The first linkage shaft (6) passes through the distribution plate (2). The distribution valve (5) is also connected to a second linkage shaft (7). The front end of the second linkage shaft (7) passes through the housing (1). An oil port (101) is provided on the front end surface of the housing (1).

2. The compact gerotor hydraulic motor according to claim 1, characterized in that: An oil passage (102) is provided in the housing (1), and the oil passage (102) is communicated with the oil port (101).

3. The compact gerotor hydraulic motor according to claim 1, characterized in that: The housing (1) is provided with a receiving chamber (103), the distribution valve (5) is located in the receiving chamber (103), and the outer diameter of the rear end of the distribution valve (5) is matched with the diameter of the inner wall of the rear end of the receiving chamber (103).

4. The compact gerotor hydraulic motor according to claim 1, characterized in that: A pressure plate (8) is also provided in the housing (1), the pressure plate (8) is in close contact with the front end of the distribution valve (5), and a spring (9) is provided between the front end of the pressure plate (8) and the housing (1).

5. The compact gerotor hydraulic motor according to claim 1, characterized in that: Also includes: A plurality of first bolts (10), wherein the first bolts (10) penetrate the housing (1) from front to back and are connected to the distribution plate (2).

6. The compact gerotor hydraulic motor according to claim 5, characterized in that: Also includes: A plurality of second bolts (11), wherein the second bolts (11) sequentially penetrate the rear cover (4), the rotor-stator pair (3) and the distribution plate (2) from the back to the front and are connected.

7. The compact gerotor hydraulic motor according to claim 6, characterized in that: The threads of the first bolt (10) and the second bolt (11) are coated with fastening glue.

8. The compact gerotor hydraulic motor according to claim 1, characterized in that: The eccentricity of the rotor-stator pair (3) is 2.2 to 2.

8.

9. The compact gerotor hydraulic motor according to claim 1, characterized in that: A sealing ring (12) is provided at the front end of the oil port (101).

10. The compact gerotor hydraulic motor according to claim 4, characterized in that: The pressure plate (8) is provided with a through hole (81) for the circulation of hydraulic oil.

Images