A hydraulic cycloid motor for improving the deformation of a balance disk

Abstract

The present invention belongs to the field of cycloid hydraulic motors, and specifically relates to a hydraulic cycloid motor for improving the deformation of a balance disk, which includes a motor housing. An output structure is provided inside the motor housing, as well as a flow distribution disk, a stator-rotor pair, a balance disk, and a rear cover connected to the motor housing. A working chamber is enclosed by the rear cover and the balance disk. The motor housing is also provided with a first oil port and a second oil port, and both the first oil port and the second oil port are communicated with the working chamber. A second sealing ring is also provided between the rear cover and the balance disk. By means of the second sealing ring, the working chamber is divided into an inner working chamber and an outer working chamber, such that when the balance disk is fed oil through different oil ports, the area of the working oil chamber on the balance disk side is different, which can well adapt to the different liquid pressures on the rotor side, improve the working efficiency of the motor when the first oil port is fed oil, and make the efficiency of the motor similar when the motor is fed oil through different oil ports.

Description

Technical Field

[0001] The present invention belongs to the field of cycloid hydraulic motors, and particularly relates to a hydraulic cycloid motor for improving the deformation of a balance disk. Background Art

[0002] A cycloid hydraulic motor is a commonly used hydraulic driving device, which is a low-speed high-torque motor. It has the advantages of small volume, high unit power density, high efficiency, wide speed range, etc., and has been widely used. With the improvement of the development level of industry and agriculture, its application will be more extensive.

[0003] A cycloid hydraulic motor has two oil ports. According to the different running directions of the motor, the two oil ports can be used as the oil inlet ports respectively. The function of the balance disk is to introduce high-pressure oil from the high-pressure chamber of the motor into the working chamber of the motor, causing the balance disk of the motor to deform, thereby changing the axial clearance of the stator-rotor pair and improving the volumetric efficiency of the motor. When the two oil ports of the motor are respectively supplied with oil, the axial forces on the rotor are different, but the forces on the balance disk are the same, that is, the axial deformation of the balance disk is only related to the pressure and has nothing to do with which oil port is the high-pressure one. In this case, due to the different axial forces on the rotor, the clearances between the balance disk and the rotor are different, resulting in different frictions between the balance disk and the rotor. Macroscopically, it is manifested that when the two oil ports of the motor are respectively supplied with high-pressure oil, the efficiencies of the motor are inconsistent. Summary of the Invention

[0004] In view of the above problems, the present invention provides a hydraulic cycloid motor for improving the deformation of a balance disk. The working chamber is divided into two inner and outer working chambers by a second sealing ring, so that when the balance disk is supplied with oil from different oil ports, the areas of the working oil chambers on the balance disk side are different, which can well adapt to the different hydraulic pressures on the rotor side, improve the working efficiency of the motor when the first oil port is supplied with oil, and make the efficiencies of the motor similar when the motor is supplied with oil from different oil ports.

[0005] The solution provided by the present invention is as follows:

[0006] A hydraulic cycloid motor for improving the deformation of a balance disk includes a motor housing, an output shaft structure provided in the motor housing, and a distribution disk, a stator-rotor pair, a balance disk and a rear cover connected to the motor housing. A first sealing ring is provided between the rear cover and the balance disk, and a working chamber is surrounded by the rear cover, the balance disk and the first sealing ring. Due to the special structural design of the cycloid hydraulic motor, there is a thickness difference of 0.02-0.05 mm between the stator and the rotor of the stator-rotor pair component. The function of the balance disk is to deform when the cycloid hydraulic motor works under high pressure to reduce the thickness difference between the stator and the rotor and improve the volumetric efficiency of the motor; high-pressure oil flows into the working chamber between the rear cover and the balance disk through a channel, causing the balance disk to deform, and the central part bulges towards the rotor direction.

[0007] The working oil circuit of the motor is the prior art structure of a cycloidal hydraulic motor, which is divided into two passages. One is the central oil cavity for setting the linkage spline, which is composed of the output shaft, the housing, and the central through hole of the distribution disc. The other is the distribution hole on the distribution disc. Both passages are connected to the working output oil cavity in the stator-rotor pair. The above-mentioned passage is opened on the balance disc, so that high-pressure oil enters the working cavity through the passage. Usually, the passage is set as a central through hole and a first one-way valve. The central through hole is connected to the central oil cavity of the motor, and the first one-way valve is connected to the high-pressure oil cavity in the working output oil cavity of the motor.

[0008] A first oil port and a second oil port are also provided on the motor housing. Both the first oil port and the second oil port are connected to the working cavity. The first oil port and the second oil port are the two main oil ports of the motor. When one of them is the high-pressure oil inlet port, the other is the low-pressure oil return port. The first oil port is connected to the distribution hole of the distribution disc, and the second oil port is connected to the central oil cavity. The two oil ports connect the hydraulic oil source and the return oil circuit to provide hydraulic oil for the stator-rotor pair. The problem of the prior art is that no matter which oil port is under high pressure, the working cavity area of the balance disc is the same. When the first oil port is the high-pressure oil inlet port, at this time the central oil cavity is the low-pressure cavity, that is, the force on both sides of the balance disc differs greatly. The central part of the balance disc will bear a large hydraulic pressure, resulting in a large deformation, reducing the thickness difference between the stator and the rotor too much, and generating a large frictional resistance between the balance disc and the rotor, thus affecting the working efficiency of the motor.

[0009] In order to solve the above problems, a second sealing ring is also provided between the rear cover and the balance disc. The working cavity is separated by the second sealing ring into a non-connected outer working cavity and an inner working cavity, that is, the outer working cavity is between the first sealing ring and the second sealing ring, and the inner working cavity is within the second sealing ring. The first oil port is connected to the outer working cavity, and the second oil port is connected to both the inner working cavity and the outer working cavity at the same time. When the first oil port is the high-pressure oil inlet port, the inner working cavity does not enter high-pressure oil, so it does not bear hydraulic pressure and generate deformation. Only the outer working cavity works, and the balance disc of the outer working cavity part generates deformation. However, due to the shape limitation, the annular balance disc of the outer working cavity part will not generate a large deformation, thus reducing the friction with the rotor to improve the motor efficiency.

[0010] To achieve the above effects, a second one-way valve is designed on the rear cover. The inlet of the second one-way valve is communicated with the inner working chamber, and the outlet of the second one-way valve is communicated with the outer working chamber, so that the second oil port is communicated with both the inner working chamber and the outer working chamber through the second one-way valve. Specifically, when the first oil port is the high-pressure oil inlet, the high-pressure oil enters the high-pressure working oil chamber of the motor through the flow distribution hole, and then flows into the outer working chamber through the first one-way valve, and is blocked by the second one-way valve and cannot enter the inner working chamber, realizing the communication between the first oil port and the outer working chamber; when the second oil port is the high-pressure oil inlet, the high-pressure oil enters the high-pressure working oil chamber of the motor through the central oil chamber, and then enters the inner working chamber through the central through hole of the balance disk. At the same time, the high-pressure oil entering the inner working chamber can also enter the outer working chamber through the second one-way valve, realizing the effect that the second oil port is communicated with both the inner working chamber and the outer working chamber at the same time.

[0011] Compared with the prior art, the advantages of the present invention are as follows:

[0012] 1. The working chamber is divided into an inner working chamber and an outer working chamber by the second sealing ring, so that when the balance disk is fed with oil from different oil ports, the area of the working oil chamber on the balance disk side is different, which can well suit the different hydraulic pressures on the rotor side and improve the working efficiency of the motor when the first oil port is fed with oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a sectional view structure diagram of the present application.

[0014] Figure 2 It is a partial sectional view structure diagram of the balance disk and the rear cover.

[0015] In the figure, 1. output shaft, 2. housing, 3. second oil passage, 4. central oil chamber, 5. rear cover, 6. second one-way valve, 7. balance disk, 8. stator-rotor pair, 9. flow distribution disk, 10. first oil passage, 11. first sealing ring, 12. outer working chamber, 13. second sealing ring, 14. central through hole, 15. inner working chamber, 16. first one-way valve. DETAILED DESCRIPTION OF THE INVENTION

[0016] The following further describes the present invention in conjunction with the drawings and embodiments.

[0017] As shown in the figure, an improved hydraulic cycloid motor with a deformed balance disk includes a motor housing 2. An output shaft structure is provided inside the motor housing 2, and a flow distribution disk 9, a stator-rotor pair 8, a balance disk 7 and a rear cover 5 connected to the motor housing 2. The central oil chamber 4 is jointly formed by the middle part of the output shaft 1, the middle part of the housing 2 and the middle part of the flow distribution disk 9. One end of the connecting spline shaft is connected to the rotor of the stator-rotor pair 8. The stator and the rotor of the stator-rotor pair 8 jointly form several working oil chambers of the cycloid motor. According to the working principle of the cycloid motor, the working oil chambers are alternately changed into high-pressure working oil chambers and low-pressure working oil chambers.

[0018] The balance disk 7 is provided with a through hole 14. A first one-way valve 16 is installed at the circumferential position of the central through hole 14. The structure of the balance disk can refer to the prior art. Generally, in order to ensure that the high-pressure working oil chamber is communicated with the working chamber no matter where the rotor rotates, three first one-way valves 16 are arranged at specific positions on the balance disk. A first sealing ring 11 is installed between the balance disk 7 and the rear cover 5. The first sealing ring 11 is arranged on the outer circumferential side of all the first one-way valves 16. The working chamber is jointly enclosed by the balance disk 7, the rear cover 5 and the first sealing ring 11.

[0019] A second sealing ring 13 is installed inside the first sealing ring 11. The installation position of the second sealing ring 13 is between the first one-way valve 16 and the central through hole 14. The size of the second sealing ring 13 can be adjusted according to the size of the rotor, as long as it is on the inner circumferential side of all the first one-way valves 16. The inner working chamber 15 is enclosed by the balance disk 7, the rear cover 5 and the second sealing ring 13, and the outer working chamber 12 is enclosed by the balance disk 7, the rear cover 5, the second sealing ring 13 and the first sealing ring 11.

[0020] The edge of the rear cover is provided with an installation hole. The second one-way valve 6 is installed in the installation hole, and a passage is opened to connect the inlet of the second one-way valve 6 to the inner working chamber 15 and the outlet to the outer working chamber 12.

[0021] The motor is provided with two oil ports. The first oil port (not shown in the figure) is connected to the working oil chamber of the motor through the first oil passage 10 and the distribution hole of the distribution disk, and then connected to the outer working chamber 12 through the first one-way valve 16; the second oil port (not shown in the figure) is connected to the central oil chamber 14 through the second oil passage 3, then enters the working oil chamber of the motor through the through hole on the rotor, and finally enters the inner working chamber 15 through the central through hole 4 on the balance disk.

[0022] When the motor is working, it has two operating directions. When oil enters from the first oil port, the high-pressure oil passes through the first oil passage 10 and the oil distribution holes of the oil distribution plate and enters the working oil cavity of the motor, and then is connected to the outer working cavity 12 through the first one-way valve 16, causing the balance disk 7 at the outer working cavity 12 to deform towards the stator-rotor pair 8, reducing the thickness difference between the rotor and the stator. And no high-pressure oil enters the inner working cavity 15, and the balance disk at the inner working cavity does not deform, reducing the friction with the rotor and improving the working efficiency of the motor when oil enters from the first oil port. When oil enters from the second oil port, the high-pressure oil passes through the second oil passage 3 and enters the central oil cavity 4, then enters the working oil cavity of the motor through the through holes on the rotor, and finally enters the inner working cavity 15 through the central through hole 14 on the balance disk. At the same time, the high-pressure oil in the inner working cavity 15 can also enter the outer working cavity 12 through the second one-way valve 6, causing the balance disk 7 at the entire working cavity to deform towards the stator-rotor pair 8 to perform the same balance disk work as the prior art. At this time, the part on the left side of the balance disk and inside the rotor is also a high-pressure oil cavity, and the pressure difference on both sides of this part of the balance disk is very small, which will not cause the balance disk to deform greatly and generate large friction with the rotor, and will not affect the working efficiency of the motor.

Claims

1. An improved hydraulic cycloid motor with balanced disc deformation, comprising a motor housing, an output structure arranged inside the motor housing, a valve plate, a stator-rotor pair, a balanced disc and a rear cover connected to the motor housing. A first sealing ring is arranged between the rear cover and the balanced disc, and a working chamber is formed by enclosing the rear cover, the balanced disc and the first sealing ring. The motor housing is further provided with a first oil port and a second oil port, and both the first oil port and the second oil port are communicated with the working chamber. It is characterized in that: A second sealing ring is further arranged between the rear cover and the balanced disc. The working chamber is separated by the second sealing ring into a non-connected outer working chamber and an inner working chamber. The first oil port is communicated with the outer working chamber, and the second oil port is communicated with both the inner working chamber and the outer working chamber at the same time; The balanced disc is provided with a first one-way valve and a central through hole. The inlet of the first one-way valve is communicated with the first oil port, and the outlet is communicated with the outer working chamber; One end of the central through hole is communicated with the second oil port, and the other end is communicated with the inner working chamber; The second sealing ring is installed inside the first sealing ring. The installation position of the second sealing ring is between the first one-way valve and the central through hole, and the size of the second sealing ring can be adjusted according to the size of the rotor.

2. The hydraulic cycloid motor for improving the deformation of the balance disk according to claim 1, wherein, The rear cover is provided with a second one-way valve. The inlet of the second one-way valve is communicated with the inner working chamber, and the outlet of the second one-way valve is communicated with the outer working chamber.

Images