Semi-integral disc flow distribution cycloid hydraulic motor

Abstract

The semi-integral disc flow distribution cycloid hydraulic motor comprises a shell of a semi-closed structure, an output shaft, a transmission shaft, a welding disc and a flow distribution disc are arranged in the shell, and a rotor and stator pair assembly, a spacer bush and a rear cover are arranged on the shell; external splines at two ends of the transmission shaft are connected with internal splines of the output shaft and the stator pair assembly; the output shaft is matched with the two needle bearings, and the outer end of the output shaft extends out of the shell. The motor is large in output power, good in whole machine efficient retentivity and small in size, so that the problems caused by installation are reduced, the manufacturing cost of the motor is effectively reduced, and the cost performance of the motor is improved.

Description

Technical Field

[0001] The invention relates to the field of cycloid hydraulic motors, and in particular to a semi-integral disc-distributed cycloid hydraulic motor. Background Art

[0002] Cycloidal hydraulic motor is a device that converts hydraulic energy into mechanical energy. It is a commonly used actuator in hydraulic systems. It is widely used in engineering machinery, agricultural machinery and other fields due to its simple structure, small size, large mass-to-power ratio and high efficiency.

[0003] End face flow distribution is also called flow distribution plate flow distribution. Because the flow distribution plate is connected to the output shaft through a spline, this flow distribution scheme has a very high flow distribution accuracy. End face flow distribution is divided into fixed gap type and gap compensation type. The fixed gap end face flow distribution has a simple structure and a small axis size, but when the flow distribution plate is worn after working for a period of time, the gap caused by wear is not effectively compensated. Therefore, the fixed gap type cycloidal motor is suitable for cycloidal motors with low pressure and low output torque. Another type of end face flow distribution cycloidal hydraulic motor with gap compensation, the gap will be automatically compensated after the flow distribution plate is worn, and this flow distribution method has a higher volumetric efficiency.

[0004] The existing disc-distributed cycloid hydraulic motor output shaft and body shell matching section must ensure the distribution accuracy, and the output shaft section is required to have high axial straightness accuracy. The motor needs to withstand certain radial loads and radial impacts in actual applications, and the shaft extension on the output shaft is easily damaged. To prevent such failures, a radial needle bearing structure support needs to be installed to protect the output shaft. At the same time, an additional lubrication system needs to be designed for the bearing structure, and a spacer is used to connect the rotor and stator pair, all of which increase the cost of the motor.

[0005] Therefore, it is necessary to develop a new type of disc-distributed cycloid hydraulic motor to overcome the above problems. Summary of the invention

[0006] Purpose of the invention: In view of the shortcomings and defects of the prior art, the present invention provides a semi-integrated disc-distributed cycloidal hydraulic motor, which has high motor output power, good high efficiency retention of the whole machine and small size, thereby reducing the problems caused by installation, effectively reducing the manufacturing cost of the motor and improving its cost performance.

[0007] Technical solution: A semi-integrated disc-distribution cycloid hydraulic motor of the present invention is characterized in that it includes a semi-enclosed structure housing, in which an output shaft, a transmission shaft, a welding disc and a distribution disc are arranged, and a rotor-stator subassembly, a spacer sleeve and a rear cover are arranged on the housing; the external splines at both ends of the transmission shaft are connected to the output shaft and the internal splines of the stator subassembly; the output shaft is matched with two needle bearings, and the outer end of the output shaft extends out of the housing.

[0008] Among them, one end of the shell is a semi-closed structure, and there is only one retaining ring groove and a bearing stop hole in the shell that are interference fit with the needle bearing, and the retaining ring is limited to form a semi-integral structure.

[0009] Among them, the rear end of the shell is provided with a positioning stop, and the outer circle of the output shaft matches with the inner hole of the needle bearing inside the shell, and the matching tolerance is 0.12mm-0.24mm.

[0010] Among them, a spacer is arranged between the two needle bearings for support, and a release hole for alleviating the internal oil pressure is arranged on one side of the spacer. The plane bearing, plane bearing retaining ring and skeleton oil seal are sequentially installed in the extension end of the output shaft, and the front part of the housing is formed by limiting the position through the retaining spring.

[0011] Wherein, the rear part of the shell is connected to the rotor-stator sub-assembly, and the slot of the transmission shaft is invertedly hung in the stopper of the welding plate to form a distribution system with the distribution plate.

[0012] Among them, the fitting clearance of the spacer is 0.25mm-0.26mm, and the end face clearance of the rotor-stator sub-assembly is 0.015mm-0.025mm.

[0013] Wherein, a brake pad is provided on the side of the distribution disc, and a compression spring and a one-way valve assembly are provided on the side of the brake pad.

[0014] Wherein, the shell body is provided with a hexagonal nut and a flat key on the outside, and a sealing ring, a polytetrafluoroethylene retaining ring and an iron sheet sealing member on the inside of the shell body.

[0015] The rear cover is provided with an oil port cover, the rear cover is fixed to the housing by means of hexagonal bolts, the rear cover is connected to the nameplate by means of rivets (24), the rear cover is provided with a plug, and a sealing ring is provided at the plug.

[0016] The front semi-integral shell part is directly connected to the rotor-stator sub-assembly, welding plate, distribution plate and rear cover to form a whole. When the pressure oil acts on the rotor-stator pair to make the rotor rotate, the rotor and the stator form a closed inter-tooth volume, half of which is in the high-pressure area and the other half is in the low-pressure area. The stator is fixed and the rotor generates a hydraulic torque under the action of the pressure oil to perform planetary motion around the center of the stator. That is, while the rotor rotates around its own center, its center revolves in the opposite direction around the center of the stator. The oil inlet and return chambers are constantly changed to squeeze out the oil. At the same time, the oil is distributed through the distribution plate, so that the distribution plate and the drive shaft operate synchronously to achieve continuous oil distribution.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention proposes a semi-integrated disc-distributed cycloidal hydraulic motor with strong axial and radial load bearing capacity and compact structure. This disc-distributed motor allows the designer to place the power source at any desired position. The motor is small in size and has a large output power, thus reducing the problems caused by installation. Moreover, since the motor can be installed on a driving device far away from the initial energy source, other mechanical transmissions and linkages, such as chains, sprockets, belts, gears, output drive shafts and universal joints, are reduced. Multiple motors can be driven by the same power source and can be connected in series or in parallel with each other, effectively reducing the machining accuracy of motor parts, simplifying its internal structure, reducing the connection of spacers, bearing support structures and the lubrication system required, and optimizing assembly accuracy. The motor has a large output power, good high-efficiency retention of the whole machine, and a small size, thus reducing the problems caused by installation, effectively reducing the manufacturing cost of the motor, and improving its cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the housing of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the spring pad that can automatically compensate after the valve plate of the present invention is worn;

[0021] Figure 4 It is a schematic diagram of the pressure-bearing of the output shaft skeleton oil seal of the present invention;

[0022] In the figure, 1 is the output shaft; 2 is the hexagonal nut; 3 is the flat key; 4 is the retaining ring; 5 is the skeleton oil seal; 6 is the plane bearing retaining ring; 7 is the plane bearing; 8 is the housing; 9 is the spacer; 10 is the needle bearing; 11 is the rotor-stator subassembly; 12 is the welding plate; 13 is the spacer; 14 is the transmission shaft; 15 is the sealing ring; 16 is the PTFE retaining ring; 17 is the iron seal; 18 is the distribution plate; 19 is the brake pad; 20 is the compression spring; 21 is the rear cover; 22 is the oil port cover; 23 is the hexagonal bolt; 24 is the rivet; 25 is the nameplate; 26 is the one-way valve assembly; 27 is the sealing ring; 28 is the plug. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0024] The semi-integral disc-distribution cycloid hydraulic motor of the present invention comprises a semi-enclosed housing 8, in which an output shaft 1, a transmission shaft 14, a welding disc 12 and a distribution disc 18 are arranged, and a rotor-stator subassembly 11, a spacer 13 and a rear cover 21 are arranged on the housing 8; the external splines at both ends of the transmission shaft 14 are connected with the internal splines of the output shaft 1 and the stator subassembly 11; the output shaft 1 is matched with two needle bearings 10, and the outer end of the output shaft 1 extends out of the housing 8. The semi-enclosed structure of the housing 8 replaces the traditional spacer connection, and the use of high-pressure oil seals can ensure the safe and reliable sealing of the motor.

[0025] One end of the housing 8 of the present invention is a semi-closed structure. There is only one retaining ring groove and a bearing stopper hole in the housing 8 that are interference fit with the needle bearing 10, and the retaining ring 4 is limited to form a semi-integral structure. A positioning stop is provided at the rear end of the housing 8, and the outer circle of the output shaft 1 is matched with the inner hole of the needle bearing 10 inside the housing 8, and the matching tolerance is 0.12mm-0.24mm. A spacer 9 is provided between the two needle bearings 10 for support, and a release hole for relieving the internal oil pressure is provided on one side of the spacer 9. The extended end of the output shaft 1 is sequentially installed with a plane bearing 7 and a plane bearing retaining ring 6, and a skeleton oil seal 5, and the front part of the housing 8 is limited by the retaining ring 4. The rear part of the housing 8 is connected to the rotor-stator subassembly 11, and the slot of the transmission shaft 14 is invertedly welded in the stop of the plate 12, and forms a distribution system with the distribution plate 18.

[0026] The fitting clearance of the spacer 13 of the present invention is 0.25mm-0.26mm, and the end face clearance of the rotor-stator subassembly 11 is 0.015mm-0.025mm. A brake pad 19 is provided on the side of the distribution plate 18, and a compression spring 20 and a one-way valve assembly 26 are provided on the side of the brake pad 19. A hexagonal nut 2 and a flat key 3 are provided on the outside of the housing 8, and a sealing ring 15, a polytetrafluoroethylene retaining ring 16 and an iron seal 17 are provided on the inside of the housing 8. The rear cover 21 is provided with an oil port cover 22, and the rear cover 21 is fixed to the housing 8 by a hexagonal bolt 23. The rear cover 21 is connected to the nameplate 25 by a rivet 24, and the rear cover 21 is provided with a plug 28, and a sealing ring 27 is provided at the plug 28.

[0027] The rotary shaft seal of the present invention has high pressure bearing capacity and can bear relatively high back pressure. The needle bearing structure is adopted, and the ability to bear axial and radial loads is strong, so that the motor can directly drive the working mechanism and has a wide range of applications. The brake pad 19 has an automatic compensation effect on the wear of the distribution surface, which not only allows the distribution disc to be used for a long time, but also maintains a high volumetric efficiency and mechanical efficiency when working at low speed. The bypass oil circuit of the rear end oil port is equipped with a one-way valve assembly 26, which can not only control the flow and pressure, prevent backflow, maintain stability and control the flow direction of the oil, but also plays a vital role. The flatness of the surface of the brake pad 19 reaches 0.003 and the roughness must meet the mirror requirements, and matte phenomenon is not allowed.

[0028] When in use, the semi-integrated housing 8 at the front end is directly connected to the rotor-stator subassembly 11, the welding plate 12, the distribution plate 18, and the rear cover 21 to form a whole. When the pressure oil acts on the rotor-stator pair to rotate the rotor, the rotor and the stator form a closed inter-tooth volume, half of which is in the high-pressure area and the other half is in the low-pressure area; the stator is fixed, and the rotor generates a hydraulic torque under the action of the pressure oil to make a planetary motion around the center of the stator, that is, while the rotor rotates around its own center, its center also revolves around the center of the stator in the opposite direction, and the oil in the return oil chamber is constantly changing, squeezing out the oil, and at the same time, the oil is distributed through the distribution plate 18, so that the distribution plate 18 and the transmission shaft 14 operate synchronously to achieve continuous oil distribution; in this cycle, the output shaft of the cycloid motor rotates continuously and outputs torque and works continuously, belonging to the field of hydraulic transmission technology. At the same time, the use of two needle roller bearings can withstand certain radial loads and radial impacts, effectively reduce the machining accuracy of motor parts, simplify its lubrication system, optimize its assembly accuracy, effectively reduce the manufacturing cost of the motor, and improve its cost performance. The present invention converts hydraulic energy into mechanical energy to realize mechanical movement.

[0029] like Figure 3 The configuration of the one-way valve assembly 26 avoids the backflow of oil in the oil channel. When the motor is in long-term operation, the wear of the pad is compensated by a spring with a force of 58N at the rear cover of the motor to provide high efficiency and durability. The standard oil leakage method prolongs the service life of the shaft seal by reducing the internal pressure borne by the seal, and produces high overall efficiency under a wide range of operating conditions.

[0030] like Figure 4 The skeleton oil seal 5 has high pressure resistance and sealing performance, and has good elasticity and sealing performance, and is still intact after a 50h endurance test.

[0031] The present invention proposes a semi-integrated disc-distributed cycloidal hydraulic motor with strong axial and radial load bearing capacity and compact structure. This disc-distributed motor allows the designer to place the power source at any desired location. The motor is small in size and has high output power, thus reducing the problems caused by installation. Moreover, since the motor can be installed on a driving device far away from the initial energy source, other mechanical transmissions and linkages, such as chains, sprockets, belts, gears, output drive shafts and universal joints, are reduced. Multiple motors can be driven by the same power source and can be connected in series or in parallel with each other, which effectively reduces the machining accuracy of motor parts, simplifies its internal structure, reduces the connection of spacers, bearing support structures and the lubrication system required, and optimizes assembly accuracy. The motor has a large output power, good high-efficiency retention of the whole machine, and a small size, thus reducing the problems caused by installation, effectively reducing the manufacturing cost of the motor and improving its cost performance.

Claims

1. A semi-integral disc-distribution cycloid hydraulic motor, characterized in that: The invention comprises a housing (8) of a semi-enclosed structure, wherein an output shaft (1), a transmission shaft (14), a welding plate (12) and a distribution plate (18) are arranged in the housing (8), and a rotor-stator subassembly (11), a spacer (13) and a rear cover (21) are arranged on the housing (8); external splines at both ends of the transmission shaft (14) are connected to the output shaft (1) and the internal splines of the stator subassembly (11); the output shaft (1) is matched with two needle bearings (10), and the outer end of the output shaft (1) extends out of the housing (8).

2. The semi-integral disc-flow cycloid hydraulic motor according to claim 1, characterized in that: One end of the housing (8) is a semi-enclosed structure. There is only one retaining ring groove and a bearing stop hole in the housing (8) that are interference-fitted with the needle bearing (10), and the retaining ring (4) is limited to form a semi-integral structure.

3. The semi-integral disc-flow cycloid hydraulic motor according to claim 1, characterized in that: The rear end of the housing (8) is provided with a positioning stop, and the outer circle of the output shaft (1) matches with the inner hole of the needle bearing (10) inside the housing (8), and the matching tolerance is 0.12mm-0.24mm.

4. The semi-integral disc-flow cycloid hydraulic motor according to claim 3, characterized in that: A spacer (9) is provided between the two needle roller bearings (10) for support, and a release hole for relieving the internal oil pressure is provided on one side of the spacer (9). The plane bearing (7), the plane bearing retaining ring (6), and the skeleton oil seal (5) are sequentially installed in the extension end of the output shaft (1), and the front part of the housing (8) is formed by limiting the position through the retaining spring (4).

5. The semi-integral disc-flow cycloid hydraulic motor according to claim 4, characterized in that: The rear part of the housing (8) is connected to the rotor-stator subassembly (11), and the slot of the transmission shaft (14) is invertedly hung in the stopper of the welding plate (12), forming a distribution system with the distribution plate (18).

6. The semi-integral disc-flow cycloid hydraulic motor according to claim 5, characterized in that: The matching clearance of the spacer (13) is 0.25mm-0.26mm, and the end surface clearance of the rotor-stator subassembly (11) is 0.015mm-0.025mm.

7. The semi-integral disc-flow cycloid hydraulic motor according to claim 1, characterized in that: A brake pad (19) is provided on the side of the distribution plate (18), and a compression spring (20) and a one-way valve assembly (26) are provided on the side of the brake pad (19).

8. The semi-integral disc-flow cycloid hydraulic motor according to claim 1, characterized in that: The shell (8) is provided with a hexagonal nut (2) and a flat key (3) on the outside, and a sealing ring (15), a polytetrafluoroethylene retaining ring (16) and an iron sheet sealing member (17) on the inside.

9. The semi-integral disc-flow cycloid hydraulic motor according to claim 1, characterized in that: The rear cover (21) is provided with an oil port cover (22). The rear cover (21) is fixed to the housing (8) by means of a hexagonal bolt (23). The rear cover (21) is connected to the nameplate (25) by means of a rivet (24). The rear cover (21) is provided with a plug (28), and a sealing ring (27) is provided at the plug (28).

10. The semi-integral disc-flow cycloid hydraulic motor according to any one of claims 1 to 9, characterized in that: The front semi-integral housing (8) is directly connected to the rotor-stator assembly (11), the welding plate (12), the distribution plate (18), and the rear cover (21) to form a whole. When the pressure oil acts on the rotor-stator assembly to rotate the rotor, the rotor and the stator form a closed inter-tooth volume, half of which is in the high-pressure area and the other half is in the low-pressure area. The stator is fixed and the rotor generates a hydraulic torque under the action of the pressure oil to perform planetary motion around the center of the stator. That is, while the rotor rotates around its own center, its center also revolves in the opposite direction around the center of the stator. The oil inlet and outlet chambers are constantly changed to squeeze out the oil. At the same time, the oil is distributed through the distribution plate (18), so that the distribution plate (18) and the transmission shaft (14) operate synchronously to achieve continuous oil distribution.

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