An internal curve radial piston motor and its control method

Abstract

This invention belongs to the field of motor technology, and specifically relates to an internal curve radial piston motor and its control method. The motor includes a front end cover, a cylinder body, an outer slip ring, an inner slip ring, a rear end cover, and a rotor. The front end cover has a flow distribution channel. Radial pistons and electromagnetic coils are evenly arranged circumferentially on the rotor. When oil flows through the motor's oil circuit, it drives the radial pistons, causing the rotor to rotate. The cylinder body has an internal curve, and a pressure switch is provided at the radial piston port to control the energization and de-energization of the coil, forming a uniform magnetic field. When the radial piston pushes out, it cuts the magnetic field lines, generating magnetic induction force. When the oil pressure is insufficient, it can assist the radial piston in pushing out. When the pressure switch detects that the return oil port pressure is low, it controls the coil to de-energize, and the radial piston is pushed back by the internal curve of the cylinder body, thereby realizing the oil suction and return process of the motor. This invention assists the motor's operation by controlling the energization and de-energization of the electromagnetic coil, reducing intermediate transmission links and featuring high efficiency, ease of control, and maintenance.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to an internal curve radial piston motor and its control method. Background Technology

[0002] The internal curve radial piston motor is an actuator in a hydraulic system that converts the pressure energy of a fluid into the mechanical energy of a working shaft to achieve energy conversion and output. Internal curve radial piston motors are suitable for various low-speed, high-torque applications, and are characterized by their small size, light weight, high starting efficiency, and stable operation at low speeds.

[0003] Currently, the problems with internal curve radial piston motors are as follows: when the motor operates under harsh conditions, the reaction force transmitted to the plastic stop when the cylindrical rollers deflect is extremely large, which will cause the elastic pin in the rotor assembly to break, resulting in the failure of the hydraulic motor. Due to the insufficient output torque of the internal curve radial piston hydraulic motor, it will be unable to drive the load to rotate. When the working oil pressure is too low, the rotor output power decreases, the motor working efficiency is significantly reduced, the starting and acceleration performance deteriorates, the output torque is unstable, and the internal wear rate is accelerated, which seriously affects the performance stability and service life of the hydraulic motor. Summary of the Invention

[0004] In view of the above, the present invention provides an internal curve radial piston motor and its control method, which eliminates the coupling, reduces the connection and fit, and adds an electric slip ring, an electromagnetic coil and a pressure switch to the original structure, and cooperates with hydraulic components to realize the auxiliary radial piston ejection and retraction action. It has the characteristics of high efficiency, easy control and maintenance, and at the same time improves energy conversion efficiency and reliability, outputs large torque and is simple to operate and control.

[0005] The technical solution adopted in this invention is to provide an internal curve radial piston motor, which includes a front end cover, a cylinder body, an outer ring of an electric slip ring, an inner ring of an electric slip ring, a rear end cover, and a rotor. The front end cover is located at the first end of the cylinder body, and the rear end cover is located at the second end of the cylinder body. The rotor is mounted on the rotor support shaft of the front end cover. A front end cover sealing ring is provided between the front end cover and the cylinder body, and a rear end cover sealing ring is provided between the rear end cover and the cylinder body. A skeleton oil seal is provided between the rotor and the rear end cover. An internal curve groove is designed on the inner circumferential surface of the cylinder body.

[0006] The front end cover includes an end cover surface and a rotor support shaft. The rotor support shaft is located in the center of the first side of the end cover surface. The end cover surface is installed at the first end of the cylinder block. The rotor support shaft is provided with a central oil hole and a plate shuttle valve. The central oil hole is located in the center of the rotor support shaft. The plate shuttle valve is installed at the second end of the central oil hole. The plate shuttle valve can switch between the oil inlet pipe joint and the oil outlet pipe joint.

[0007] The end cap surface is provided with a flow distribution channel, an oil inlet pipe joint and an oil outlet pipe joint. The flow distribution channel is evenly distributed in the center of the end cap surface along the circumferential direction. The first end of the flow distribution channel is provided with an oil inlet pipe joint and the second end of the flow distribution channel is provided with an oil outlet pipe joint.

[0008] The rotor is equipped with an electromagnetic coil, radial plungers, radial plunger mounting holes, an insulating frame, pressure detection oil holes, and a pressure switch. The radial plunger mounting holes are evenly distributed circumferentially at the second end of the rotor. An insulating frame is installed at the first end of each radial plunger mounting hole. The radial plunger passes through the insulating frame and is installed within the radial plunger mounting hole. An electromagnetic coil is wound around the insulating frame. A pressure detection oil hole is axially arranged on the rotor, communicating with the radial plunger mounting holes. The pressure switch is installed within the pressure detection oil hole. A plunger sealing ring is installed at the second end of each radial plunger. The rotor is equipped with an inner slip ring, and an outer slip ring is installed on the inner slip ring. An internal wiring terminal is located at the first end of the inner slip ring. The rear end cover has a rear end cover outlet and a rear end cover inlet.

[0009] Preferably, the rotor support shaft is provided with a groove and an oil hole, the groove is arranged circumferentially along the rotor support shaft, and the oil hole is located at the bottom of the groove.

[0010] Preferably, a circular hole is provided in the central part of the insulating frame, and the cross-section of the insulating frame is set as an I-shaped structure.

[0011] Preferably, a coil baffle is provided at the second end of the electromagnetic coil.

[0012] Furthermore, preferably, the rotor is cylindrical, with the first end of the rotor fitting into the end cover surface, and the second end of the rotor having a mounting groove for fitting into working machinery.

[0013] Preferably, the edges of the inner curved groove are designed with rounded corners.

[0014] Preferably, the radial plunger is made of tungsten carbide material, one end of the radial plunger is designed to be streamlined and the surface is coated, and steel balls are installed on the radial plunger. The steel balls are tightly pressed against the inner circumferential surface of the cylinder body, and the inner curved groove interacts with the radial plunger to form a working cavity.

[0015] Preferably, the rear end cover is provided with bolt mounting holes, and the rear end cover is connected to the cylinder block by bolts.

[0016] Preferably, the control method for the internal curve radial piston motor provided by the present invention includes the following steps:

[0017] S1: Connect the mechanical rotating shaft to the rotor via a key;

[0018] S2: Connect the inner ring of the slip ring to the rotor via a key;

[0019] S3: The inner ring of the electric slip ring is energized, and the power is connected from the inlet of the rear cover, transmitted to the mechanical shaft through the inner ring of the electric slip ring, and then flows out from the outlet of the rear cover.

[0020] S4: Connect the motor oil circuit. The oil flows in from the inlet pipe joint, passes through the plate shuttle valve into the distribution channel, and flows evenly to each central oil hole. When it reaches the radial plunger at the rotor, it pushes the radial plunger out, and the plate shuttle valve moves to switch the hydraulic motor inlet and outlet.

[0021] S5: A steel ball is installed on the radial plunger. After the radial plunger is pushed out by the oil, the steel ball contacts the inner curved groove set on the inner circumference of the cylinder body. The steel ball is tightly pressed against the inner circumference of the cylinder body. The inner curved groove pushes the radial plunger back into the radial plunger mounting hole, thereby retracting the radial plunger.

[0022] S6: The pressure switch controls the start and stop of the circuit based on the pressure changes in the system, ensuring that the equipment operates safely within the preset pressure range. When insufficient oil pressure is detected, it will control the electromagnetic coil to be energized, generating an electromagnetic field. When the radial piston moves, it will cut the magnetic induction lines, generating magnetic induction force to assist the radial piston movement.

[0023] S7: When the working oil pressure is too low, the rotor output power decreases. Under the dual action of electromagnetic force and oil pressure, this hydraulic motor implements step S6 to increase the output torque.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. This invention eliminates the coupling, reduces connections and fits, improves energy conversion efficiency and reliability, and features convenient installation, simple operation and control, and large output torque.

[0026] 2. In this invention, the oil distribution device acts as a stator structure to drive the rotor, enabling the hydraulic motor to rotate by hydraulic pressure. By controlling the current change of the electromagnetic coil, the extension and retraction of the radial plunger are controlled, reducing intermediate transmission links and improving working efficiency. It features high efficiency, ease of control and maintenance.

[0027] 3. This invention does not require a separate motor to provide torque, and has the characteristics of small size and easy installation.

[0028] 4. The rear cover of the present invention is provided with an inlet and an outlet. The electromagnetic coil is connected to the outlet through an electric slip ring and a pressure switch, thereby realizing the gain and loss control of the electromagnetic coil.

[0029] 5. In this invention, when the hydraulic motor is working, the steel ball on the radial plunger moves along the multi-acting inner curve slide rail, which transforms sliding friction into rolling friction, reduces friction, and improves the working life of the motor. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the front cover structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the rear cover structure of the present invention;

[0033] Figure 4 This is a diagram of the internal apparatus of the present invention;

[0034] Figure 5 This is a cross-sectional view of the rotor structure of the present invention;

[0035] Figure 6 This is a diagram showing the distribution of the internal electromagnetic coils and plungers of this invention.

[0036] Figure 7 This is an exploded view of the structure of the present invention;

[0037] Figure 8 This is a flowchart of the control method of the present invention. Detailed Implementation

[0038] To fully describe the technical content, structural features, objectives, and effects of this invention, a detailed description will be provided below in conjunction with the accompanying drawings.

[0039] This invention provides an internally curved radial piston motor, such as... Figures 1 to 7 As shown, it includes a front cover 1, a cylinder 4, an outer slip ring 5, an inner slip ring 6, a rear cover 8, and a rotor 10. The front cover 1 is located at the first end of the cylinder 4, and the rear cover 8 is located at the second end of the cylinder 4. The rotor 10 is mounted on the rotor support shaft 26 of the front cover 1. A front cover sealing ring 15 is provided between the front cover 1 and the cylinder 4, and a rear cover sealing ring 7 is provided between the rear cover 8 and the cylinder 4. A skeleton oil seal 23 is provided between the rotor 10 and the rear cover 8. An inner curved groove 22 is designed on the inner circumferential surface of the cylinder 4.

[0040] The front cover 1 includes an end cover surface 31 and a rotor support shaft 26. The rotor support shaft 26 is located at the center of the first side of the end cover surface 31. The end cover surface 31 is installed at the first end of the cylinder body 4. The rotor support shaft 26 is provided with a central oil hole 24 and a plate shuttle valve 25. The central oil hole 24 is located at the center of the rotor support shaft 26. The plate shuttle valve 25 is installed at the second end of the central oil hole 24. The plate shuttle valve 25 can switch between the oil inlet 161 and the oil outlet 171.

[0041] The end cap surface 31 is provided with a flow distribution channel 18, an oil inlet pipe joint 16 and an oil outlet pipe joint 17. The flow distribution channel 18 is evenly arranged in the center of the end cap surface 31 along the circumferential direction. The first end of the flow distribution channel 18 is provided with an oil inlet pipe joint 16 and the second end of the flow distribution channel 18 is provided with an oil outlet pipe joint 17.

[0042] The rotor 10 is equipped with an electromagnetic coil 2, a radial plunger 3, a radial plunger mounting hole 29, an insulating frame 30, a pressure detection oil hole 32, and a pressure switch 12. The radial plunger mounting holes 29 are evenly distributed around the second end of the rotor 10 in the circumferential direction. An insulating frame 30 is installed at the first end of the radial plunger mounting hole 29. The radial plunger 3 passes through the insulating frame 30 and is installed inside the radial plunger mounting hole 29. The electromagnetic coil 2 is wound on the insulating frame 30. The rotor 10 has a pressure detection oil hole 32 along the axial direction, which communicates with the radial plunger mounting hole 29. The pressure switch 12 is installed inside the pressure detection oil hole 32. A plunger sealing ring 13 is installed at the second end of the radial plunger 3. The rotor 10 is equipped with an inner slip ring 6, and an outer slip ring 5 is installed on the inner slip ring 6. The first end of the inner slip ring 6 is equipped with an internal slip ring connector 9. The rear end cover 8 is equipped with a rear end cover outlet 21 and a rear end cover inlet 20.

[0043] The rotor support shaft 26 is provided with a sliding groove 27 and an oil hole 28. The sliding groove 27 is arranged circumferentially along the rotor support shaft 26, and the oil hole 28 is located at the bottom of the sliding groove 27. A circular hole is provided in the center of the insulating frame 30, and the cross-section of the insulating frame 30 is set as an I-beam structure. A coil baffle 14 is provided at the second end of the electromagnetic coil 2 to prevent the electromagnetic coil from falling off.

[0044] The rotor 10 is cylindrical, with its first end fitting into the end cover 31. The second end of the rotor 10 has a mounting groove 34 for mounting with working machinery. The edges of the inner curved groove 22 are rounded to reduce stress concentration and improve sealing performance.

[0045] The radial plunger 3 is made of wear-resistant tungsten carbide to improve its wear resistance. The head of the radial plunger 3 has a streamlined design and its surface is coated to reduce surface roughness, lower fluid resistance, reduce dynamic pressure loss during fluid movement, and improve efficiency. Steel balls 33 are installed on the radial plunger 3, and the steel balls 33 are tightly pressed against the inner circumference of the cylinder body 4. The inner curved groove 22 interacts with the radial plunger 3 to form a working chamber. The rear end cover 8 is provided with bolt mounting holes 19, and the rear end cover 8 is connected to the cylinder body 4 by bolts 11.

[0046] In addition, such as Figure 8 As shown, the control method for an internal curve radial piston motor provided by the present invention includes the following steps:

[0047] S1: Connect the mechanical rotating shaft to the rotor 10 via a key.

[0048] S2: Connect the inner ring 6 of the slip ring to the rotor 10 via a key.

[0049] S3: The inner ring 6 of the electric slip ring is energized. Power is supplied from the inlet 20 of the rear cover, transmitted to the mechanical shaft through the inner ring 6, and then flows out from the outlet 21 of the rear cover.

[0050] S4: Connect the motor oil circuit. The oil flows in from the inlet pipe joint 16, passes through the plate shuttle valve 25 and flows into the distribution channel 18. It flows evenly through the distribution channel 18 to each central oil hole 24 and reaches the radial plunger 3 at the rotor 10. It pushes the radial plunger 3 out and moves the plate shuttle valve 25 to switch the hydraulic motor inlet 161 and outlet 171.

[0051] S5: A steel ball 33 is installed on the radial plunger 3. After the radial plunger 3 is pushed out by the oil, the steel ball 33 contacts the inner curved groove 22 set on the inner circumferential surface of the cylinder 4. The steel ball 33 presses tightly against the inner circumferential surface of the cylinder 4, and the radial plunger 3 is pushed back into the radial plunger mounting hole 29 by the inner curved groove 22, thereby causing the radial plunger 3 to retract.

[0052] S6: Pressure switch 12 controls the start and stop of the circuit according to the pressure change in the system, ensuring that the equipment operates safely within the preset pressure range. When insufficient oil pressure is detected, it will control the electromagnetic coil 2 to be energized, generating an electromagnetic field. When the radial plunger 3 moves, it will cut the magnetic induction lines, generating magnetic induction force to assist the radial plunger 3 in moving.

[0053] S7: When the working oil pressure is too low, the output power of rotor 10 decreases. Under the dual action of electromagnetic force and oil pressure, this hydraulic motor implements step S6 to increase the output torque.

[0054] Specifically, the front cover 1 of the inner curve radial piston motor of the present invention is provided with a distribution channel 18. After the motor oil circuit is filled with oil, it drives the radial piston 3 and drives the rotor 10 to rotate. The cylinder body 4 is equipped with a regular multi-acting inner curve 22. The radial piston 3 and the multi-acting inner curve 22 of the cylinder body 4 contact to realize the oil suction and oil return process of the motor. The inner curve radial piston motor of the present invention is provided with an inner slip ring 6 and an inner slip ring 5 to realize that the electromagnetic coil 2 follows the rotor 10 to rotate. Each radial piston 3 is equipped with a pressure switch 12 to detect the pressure of each oil port, thereby controlling the gain and loss of power of the electromagnetic coil 2. The power is led from the outer slip ring 5 and the inner slip ring 6 to the pressure switch 12, and then from the pressure switch 12 to the electromagnetic coil 2. The inner slip ring 6 realizes the transmission of electrical signals between the rotor 10 and the mechanical shaft, so that the hydraulic motor rotor 10 has a larger range of motion and a more complex motion mode, and can avoid the cable from getting tangled during rotation, which would cause damage and wear. Electromagnetic coil 2 is energized with three-phase alternating current, with a phase difference of 120° between the three phases. The uniform circular magnetic field generated by the three-phase alternating current cuts the magnetic field lines when the radial plunger 3 is pushed out, generating a magnetic induction force. When the oil pressure is insufficient, it can assist the radial plunger 3 in pushing out. When the pressure switch 12 detects that the return oil port pressure is low, it controls the electromagnetic coil 2 to be de-energized, and the radial plunger 3 is pushed back by the multi-acting inner curve 22 of the cylinder 4, completing the oil suction and discharge actions. When the working oil pressure is too low, the output power of rotor 10 decreases, the motor working efficiency is significantly reduced, and the output torque is unstable, seriously affecting the performance stability and service life of the hydraulic motor. This hydraulic motor, under the dual action of electromagnetic force and oil pressure, will increase the output torque and solve the series of problems mentioned above.

[0055] The above description is a preferred embodiment of this application and is not intended to limit the scope of protection of this invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this technology, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An internal curve radial piston motor, characterized in that, It includes a front cover, cylinder block, outer slip ring, inner slip ring, rear cover, and rotor. The front cover is located at the first end of the cylinder body, the rear cover is located at the second end of the cylinder body, the rotor is mounted on the rotor support shaft of the front cover, a front cover sealing ring is provided between the front cover and the cylinder body, a rear cover sealing ring is provided between the rear cover and the cylinder body, a skeleton oil seal is provided between the rotor and the rear cover, and an inner curved groove is designed on the inner circumferential surface of the cylinder body. The front end cover includes an end cover surface and a rotor support shaft. The rotor support shaft is located in the center of the first side of the end cover surface. The end cover surface is installed at the first end of the cylinder block. The rotor support shaft is provided with a central oil hole and a plate shuttle valve. The central oil hole is located in the center of the rotor support shaft. The plate shuttle valve is installed at the second end of the central oil hole. The plate shuttle valve can switch between the oil inlet pipe joint and the oil outlet pipe joint. The end cap surface is provided with a flow distribution channel, an oil inlet pipe joint and an oil outlet pipe joint. The flow distribution channel is evenly distributed in the center of the end cap surface along the circumferential direction. The first end of the flow distribution channel is provided with an oil inlet pipe joint and the second end of the flow distribution channel is provided with an oil outlet pipe joint. The rotor is equipped with an electromagnetic coil, a radial plunger, a radial plunger mounting hole, an insulating frame, a pressure detection oil hole, and a pressure switch. The radial plunger mounting holes are evenly distributed at the second end of the rotor along the circumferential direction. An insulating frame is installed at the first end of the radial plunger mounting hole. The radial plunger passes through the insulating frame and is installed in the radial plunger mounting hole. An electromagnetic coil is wound on the insulating frame. The rotor is provided with a pressure detection oil hole along the axial direction. The pressure detection oil hole communicates with the radial plunger mounting hole. The pressure switch is installed in the pressure detection oil hole. A plunger sealing ring is installed at the second end of the radial plunger. The rotor is equipped with an inner slip ring, and an outer slip ring is installed on the inner slip ring. The first end of the inner slip ring is provided with an internal slip ring terminal, and the rear end cover is provided with a rear end cover outlet and a rear end cover inlet. Each radial plunger is equipped with a pressure switch to detect the pressure at each oil port, thereby controlling the energization of the solenoid coil. Power is drawn from the outer and inner rings of the slip ring to the pressure switch, and then from the pressure switch to the solenoid coil. The solenoid coil is powered by three-phase alternating current with a phase difference of 120° between the three phases. The three-phase alternating current generates a uniform circular magnetic field. When the radial plunger pushes out, it cuts the magnetic field lines, generating a magnetic induction force. When the oil pressure is insufficient, it assists in pushing out the radial plunger. When the pressure switch detects that the return oil port pressure is low, it controls the solenoid coil to de-energize. The radial plunger is then pushed back by the multi-acting inner curve of the cylinder block, completing the oil suction and discharge actions.

2. The internal curve radial piston motor according to claim 1, characterized in that, The rotor support shaft is provided with a sliding groove and an oil hole. The sliding groove is arranged circumferentially along the rotor support shaft, and the oil hole is located at the bottom of the sliding groove.

3. The internal curve radial piston motor according to claim 1, characterized in that, A circular hole is provided in the center of the insulating frame, and the cross-section of the insulating frame is set as an I-beam structure.

4. The internal curve radial piston motor according to claim 1, characterized in that, A coil baffle is provided at the second end of the electromagnetic coil.

5. The internal curve radial piston motor according to claim 1, characterized in that, The rotor is cylindrical, with the first end of the rotor fitting into the end cover surface, and the second end of the rotor having a mounting groove for fitting into working machinery.

6. The internal curve radial piston motor according to claim 1, characterized in that, The edges of the inner curved groove are designed with rounded corners.

7. The internal curve radial piston motor according to claim 1, characterized in that, The radial plunger is made of tungsten carbide. One end of the radial plunger is designed to be streamlined and coated. Steel balls are installed on the radial plunger and are tightly pressed against the inner circumference of the cylinder. The inner curved groove interacts with the radial plunger to form a working chamber.

8. The internal curve radial piston motor according to claim 1, characterized in that, The rear end cover has bolt mounting holes, and the rear end cover is connected to the cylinder block by bolts.

9. A control method for an internal curve radial piston motor according to any one of claims 1 to 8, characterized in that, It includes the following steps: S1: Connect the mechanical rotating shaft to the rotor via a key; S2: Connect the inner ring of the slip ring to the rotor via a key; S3: The inner ring of the electric slip ring is energized. The power is connected from the inlet of the rear cover, transmitted to the mechanical rotating shaft through the inner ring of the electric slip ring, and then flows out from the outlet of the rear cover. S4: Connect the motor oil circuit. The oil flows in from the inlet pipe joint, passes through the plate shuttle valve into the distribution channel, and flows evenly to each central oil hole. When it reaches the radial plunger at the rotor, it pushes the radial plunger out, and the plate shuttle valve moves to switch the hydraulic motor inlet and outlet. S5: A steel ball is installed on the radial plunger. After the radial plunger is pushed out by the oil, the steel ball contacts the multi-acting inner curve set on the inner circumference of the cylinder body. The steel ball is tightly pressed against the inner circumference of the cylinder body. The multi-acting inner curve pushes the radial plunger back into the radial plunger mounting hole, thereby causing the radial plunger to retract. S6: The pressure switch controls the start and stop of the circuit based on the pressure changes in the system, ensuring that the equipment operates safely within the preset pressure range. When insufficient oil pressure is detected, it will control the electromagnetic coil to be energized, generating an electromagnetic field. When the radial piston moves, it will cut the magnetic induction lines, generating magnetic induction force to assist the radial piston movement. S7: When the working oil pressure is too low, the rotor output power decreases. Under the dual action of electromagnetic force and oil pressure, the hydraulic motor implements step S6 to increase the output torque.

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