Rigidity compensation type cycloid hydraulic motor

Abstract

The rigidity compensation type cycloid hydraulic motor comprises a shell, a rotor and stator assembly, a compensation disc and a rear cover which are sequentially arranged from front to back, and a bolt sequentially penetrates through the rear cover, the compensation disc and the rotor and stator assembly from back to front and then is connected with the shell. The rotor and stator assembly comprises a stator, a rotor and a plurality of hollow pin teeth, the rotor is located in the stator, the hollow pin teeth are located between the stator and the rotor, and bolts penetrate through the hollow pin teeth; wherein a plurality of through holes and oil guide grooves are formed in the compensation disc, the through holes are communicated with the oil guide grooves, and the compensation disc can guide high-pressure oil into the hollow pin teeth so as to improve the rigidity of the hollow pin teeth. Through structural improvement, high-pressure oil enters the inner holes of all the hollow pin teeth through the oil guide grooves, the rigidity of the hollow pin teeth can be improved, and then the maximum bearable pressure of the cycloid hydraulic motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic motors, in particular to a rigidity-compensated cycloid hydraulic motor. Background Art

[0002] Cycloidal hydraulic motor is a device that converts hydraulic energy into mechanical energy. Cycloidal hydraulic motors are widely used due to their many advantages such as simple structure, wide speed range and high torque. Cycloidal hydraulic motors include a rotor-stator pair (including rotor, stator and pinion), and the pinion is located between the rotor and the stator. Conventional pinion is a solid structure, and bolt holes need to be opened on the stator when assembling the motor, resulting in a large overall radial size of the motor. In order to improve the compactness of the motor and reduce the volume, the solid pinion is improved to a hollow pinion, and the inner hole of the hollow pinion can serve as a bolt hole, so that there is no need to open additional holes on the stator. However, after actual testing, it was found that due to the opening of holes on the pinion, the rigidity of the pinion was reduced. During the endurance test, the maximum pressure can only reach 175Bar, otherwise, the pinion will crack or even break due to the inability to withstand the pressure. The design requirements of the cycloidal hydraulic motor require that the maximum pressure can reach 225Bar. Therefore, the cycloidal hydraulic motor needs to be improved. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides a stiffness-compensated cycloid hydraulic motor.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a stiffness-compensated cycloidal hydraulic motor, comprising: a housing, a rotor-stator assembly, a compensation plate and a rear cover arranged in sequence from front to back, wherein bolts penetrate the rear cover, the compensation plate and the rotor-stator assembly in sequence from back to front and are connected to the housing; the rotor-stator assembly comprises: a stator, a rotor and a plurality of hollow needle teeth, wherein the rotor is located inside the stator, the hollow needle teeth are located between the stator and the rotor, and the bolts penetrate the hollow needle teeth; wherein a plurality of through holes and oil guide grooves are provided on the compensation plate, the through holes and the oil guide grooves are connected, and the compensation plate can introduce high-pressure oil into the hollow needle teeth to improve the stiffness of the hollow needle teeth.

[0005] Furthermore, the oil guide groove is arranged on a side of the compensation plate facing the rear cover.

[0006] Furthermore, the hollow needle teeth are provided with inner holes, and the inner holes correspond one to one with the through holes.

[0007] Furthermore, the rear cover is provided with a plurality of bolt holes, and the bolt holes correspond to the through holes one by one.

[0008] Furthermore, a first annular groove is provided on a side of the rear cover facing the compensation disk, and the first annular groove is connected to the bolt hole.

[0009] Furthermore, a second annular groove is formed on the rear cover, and the diameter of the outer ring of the second annular groove is smaller than the diameter of the inner ring of the first annular groove.

[0010] Furthermore, a retaining ring and a sealing ring for sealing are provided on one side of the second annular groove.

[0011] Furthermore, a plug is installed at the center of the rear cover.

[0012] Furthermore, a spacer is provided between the housing and the rotor-stator assembly.

[0013] Furthermore, an output shaft and a transmission shaft are provided in the housing, the front end of the output shaft passes through the housing, the front end of the transmission shaft is connected to the output shaft, and the rear end of the transmission shaft is connected to the rotor.

[0014] The beneficial effect of the utility model is that the rigidity compensation type cycloid hydraulic motor of the utility model, through structural improvement, allows high-pressure oil to enter the inner holes of all hollow needle teeth through the oil guide groove, which can improve the rigidity of the hollow needle teeth, thereby increasing the maximum tolerable pressure of the cycloid hydraulic motor. By improving the structure of the rear cover, the gap caused by the deformation of the compensation disk can be compensated, the sealing effect can be improved, and leakage can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a cross-sectional view of the stiffness-compensated cycloid hydraulic motor of the utility model.

[0017] Figure 2 It is a structural schematic diagram of the compensation disk of the utility model.

[0018] Figure 3 It is a cross-sectional view of the rotor-stator assembly of the utility model.

[0019] Figure 4 It is a schematic diagram of the assembly of the compensation plate and bolts of the utility model.

[0020] Figure 5 It is a structural schematic diagram of the back cover of the utility model.

[0021] Figure 6 This utility model Figure 1 A partial enlarged schematic diagram of .

[0022] Figure 7 It is a structural schematic diagram of the partition plate of the utility model.

[0023] In the figure: 1, housing; 2, rotor-stator assembly; 3, compensation plate; 4, rear cover; 5, bolts; 6, retaining ring; 7, sealing ring; 8, plug; 9, spacer; 10, output shaft; 11, transmission shaft; 21, stator; 22, rotor; 23, hollow needle teeth; 31, through hole; 32, oil guide groove; 231, inner hole; 41, bolt hole; 42, first annular groove; 43, second annular groove; 91, first through hole; 92, second through hole. 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 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.

[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 7As shown, the stiffness compensation type cycloidal hydraulic motor of the utility model comprises: a housing 1, a rotor-stator assembly 2, a compensation plate 3 and a rear cover 4 arranged in sequence from front to back, and a bolt 5 penetrates the rear cover 4, the compensation plate 3 and the rotor-stator assembly 2 in sequence from back to front and is connected to the housing 1. The rotor-stator assembly 2 comprises: a stator 21, a rotor 22 and a plurality of hollow needle teeth 23, the rotor 22 is located inside the stator 21, the hollow needle teeth 23 are located between the stator 21 and the rotor 22, and the bolt 5 penetrates the hollow needle teeth 23. Among them, a plurality of through holes 31 and oil guide grooves 32 are opened on the compensation plate 3, and the through holes 31 and the oil guide grooves 32 are connected, and the compensation plate 3 can introduce high-pressure oil into the hollow needle teeth 23 to improve the stiffness of the hollow needle teeth 23.

[0028] It should be noted that the rotor 22 abuts against the hollow needle teeth 23 to divide the cavity between the rotor 22 and the stator 21 into several oil chambers. When the motor is in operation, there are always high-pressure chambers and low-pressure chambers in the several oil chambers. The high and low pressure differences enable the rotor 22 to swing. At least one of the front end faces of the multiple bolts 5 is a high-pressure face. The high-pressure oil can reach the oil guide groove 32 through the hollow needle teeth 23 and the through hole 31 through which the bolt 5 passes. The high-pressure oil is guided to other hollow needle teeth 23 through the oil guide groove 32 to improve the rigidity of the hollow needle teeth 23. The utility model has an ingenious structure and strong practicality.

[0029] like Figure 3 As shown, taking seven hollow needle teeth 23 as an example, the seven hollow needle teeth 23 are respectively denoted as R1 to R7, and the oil chambers formed are respectively denoted as C1 to C7. When the motor is working, the C1 chamber is a high-low pressure switching chamber, C2, C3, and C4 are high-pressure chambers, and C5, C6, and C7 are low-pressure chambers. In this state, the hollow needle teeth R1, R5, R6, and R7 are pressure-bearing needle teeth, that is, the force of the high-pressure oil on the rotor 22 is distributed at the contact points between R1, R5, R6, and R7 and the rotor 22. The front end faces of the hollow needle teeth R1 and R5 are between high and low pressures, the front end faces of the hollow needle teeth R6 and R7 are in a low-pressure state, and the front end faces of the hollow needle teeth R2, R3, and R4 are in a high-pressure state. The high-pressure oil at the hollow needle teeth R2, R3, and R4 enters the other hollow needle teeth 23 through the oil guide groove 32, which can increase the rigidity of the hollow needle teeth 23.

[0030] For example, the hollow needle tooth 23 is provided with an inner hole 231, and the inner hole 231 corresponds to the through hole 31 one by one. The rear cover 4 is provided with a plurality of bolt holes 41, and the bolt holes 41 correspond to the through holes 31 one by one. The oil guide groove 32 is provided on the side of the compensation plate 3 facing the rear cover 4. That is, the bolt 5 passes through the bolt hole 41, the through hole 31, and the inner hole 231 from the back to the front, and then is threadedly connected with the housing 1, and there is a gap between the front end surface of the bolt 5 and the bottom surface of the threaded hole of the housing 1. There is a gap between the inner wall of the inner hole 231 and the through hole 31 and the bolt 5. Thus, the high-pressure oil at the front end face of the bolt 5 can pass through the gap at the inner hole 231 and the gap at the through hole 31 to reach the oil guide groove 32. The oil guide groove 32 is an annular groove, and all through holes 31 are connected to the oil guide groove 32. Therefore, the high-pressure oil drawn from one through hole 31 can enter other through holes 31 through the oil guide groove 32, and then enter other inner holes 231, so that the inner holes 231 of all hollow needle teeth 23 are filled with high-pressure oil to improve the rigidity of the hollow needle teeth 23. After endurance testing, the maximum pressure withstood by the motor of the utility model can reach 225Bar.

[0031] Since the thickness of the compensation disk 3 is relatively thin, after the right side of the compensation disk 3 is grooved, a cavity is formed between the oil guide groove 32 and the rear cover 4. When the motor is working, the compensation disk 3 is easily deformed in the cavity, resulting in an increase in the gap between the compensation disk 3 and the rotor-stator assembly 2, and a reduction in the sealing effect. To this end, the utility model provides a first annular groove 42 on the side of the rear cover 4 facing the compensation disk 3, and the first annular groove 42 is connected to the bolt hole 41. The rear cover 4 is also provided with a second annular groove 43, and the diameter of the outer ring of the second annular groove 43 is smaller than the diameter of the inner ring of the first annular groove 42. A retaining ring 6 and a sealing ring 7 for sealing are provided on one side of the second annular groove 43.

[0032] That is to say, the first annular groove 42 is connected to the oil guide groove 32, and the second annular groove 43 is also connected to the first annular groove 42 through a small gap. The high-pressure oil guided out of the oil guide groove 32 can enter the first annular groove 42 and the second annular groove 43, forming a high-pressure area on the rear end surface of the compensation plate 3, and the high-pressure area is sealed by the retaining ring 6 and the sealing ring 7. The high-pressure area can compensate for the gap generated at the deformation of the compensation plate 3 and improve the sealing effect.

[0033] For example, a spacer 9 is provided between the housing 1 and the rotor-stator assembly 2. An output shaft 10 and a transmission shaft 11 are provided in the housing 1. The front end of the output shaft 10 passes through the housing 1, the front end of the transmission shaft 11 is connected to the output shaft 10, and the rear end of the transmission shaft 11 is connected to the rotor 22. The spacer 9 is provided with a first through hole 91 for the bolt 5 to pass through and a second through hole 92 for the hydraulic oil to pass through. The hydraulic oil at the rotor-stator assembly 2 can enter the housing 1 (including the threaded hole of the housing 1) through the second through hole 92. When the rotor 22 swings, it drives the transmission shaft 11 to rotate, and then drives the output shaft 10 to rotate. For example, a plug 8 is installed at the center of the rear cover 4. When the motor is working, some hydraulic oil will enter the output shaft 10 through the gap between the housing 1, the spacer 9 and the output shaft 10. At this time, unscrewing the plug 8 and connecting the rear cover 4 to the drain pipe can release the hydraulic oil inside the output shaft 10 to prevent pressure build-up.

[0034] In summary, the rigidity-compensated cycloid hydraulic motor of the present invention, through structural improvement, allows high-pressure oil to enter the inner holes 231 of all hollow needle teeth 23 through the oil guide groove 32, thereby improving the rigidity of the hollow needle teeth 23 and thus increasing the maximum tolerable pressure of the cycloid hydraulic motor. By improving the structure of the rear cover 4, the gap caused by the deformation of the compensation plate 3 can be compensated, the sealing effect can be improved, and leakage can be prevented.

[0035] 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 stiffness-compensated cycloid hydraulic motor, characterized in that: include: A housing (1), a rotor-stator assembly (2), a compensation plate (3) and a rear cover (4) are arranged in sequence from front to back, and a bolt (5) penetrates the rear cover (4), the compensation plate (3) and the rotor-stator assembly (2) in sequence from back to front and is then connected to the housing (1); The rotor-stator assembly (2) comprises: a stator (21), a rotor (22) and a plurality of hollow needle teeth (23); the rotor (22) is located inside the stator (21); the hollow needle teeth (23) are located between the stator (21) and the rotor (22); and the bolt (5) passes through the hollow needle teeth (23); The compensation plate (3) is provided with a plurality of through holes (31) and oil guide grooves (32), the through holes (31) and the oil guide grooves (32) are connected, and the compensation plate (3) can introduce high-pressure oil into the hollow needle teeth (23) to improve the rigidity of the hollow needle teeth (23).

2. The stiffness-compensated cycloid hydraulic motor according to claim 1, characterized in that: The oil guide groove (32) is provided on a side of the compensation plate (3) facing the rear cover (4).

3. The stiffness-compensated cycloid hydraulic motor according to claim 1, characterized in that: The hollow needle tooth (23) is provided with an inner hole (231), and the inner hole (231) corresponds one-to-one to the through hole (31).

4. The stiffness-compensated cycloid hydraulic motor according to claim 1, characterized in that: The rear cover (4) is provided with a plurality of bolt holes (41), and the bolt holes (41) correspond one-to-one to the through holes (31).

5. The stiffness-compensated cycloid hydraulic motor according to claim 4, characterized in that: A first annular groove (42) is provided on a side of the rear cover (4) facing the compensation disk (3), and the first annular groove (42) is communicated with the bolt hole (41).

6. The rigidity-compensated cycloid hydraulic motor according to claim 5, characterized in that: The rear cover (4) is also provided with a second annular groove (43), and the diameter of the outer circle of the second annular groove (43) is smaller than the diameter of the inner circle of the first annular groove (42).

7. The stiffness-compensated cycloid hydraulic motor according to claim 6, characterized in that: A retaining ring (6) and a sealing ring (7) for sealing are provided on one side of the second annular groove (43).

8. The stiffness-compensated cycloid hydraulic motor according to claim 1, characterized in that: A plug (8) is installed at the center of the rear cover (4).

9. The stiffness-compensated cycloid hydraulic motor according to claim 1, characterized in that: A spacer disc (9) is provided between the housing (1) and the rotor-stator assembly (2).

10. The stiffness-compensated cycloid hydraulic motor according to claim 1, characterized in that: An output shaft (10) and a transmission shaft (11) are arranged in the housing (1); the front end of the output shaft (10) passes through the housing (1); the front end of the transmission shaft (11) is connected to the output shaft (10); and the rear end of the transmission shaft (11) is connected to the rotor (22).

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