High-integration light hydraulic power source

Abstract

The invention discloses a high-integration light hydraulic power source, which adopts an airborne hydraulic power scheme of'double-channel motor-fixed displacement pump + energy accumulator ', and adopts a permanent magnet synchronous motor to drive the fixed displacement pump to realize oil supply and oil return. After the servo driver receives a starting instruction of the control system, the two-channel motor is driven to rotate, the hydraulic pump is driven to rotate at a high speed and output flow while the motor rotates, the energy accumulator is pressurized, and a high-pressure oil source is provided for the 12-way hydraulic actuator joint. When the driver receives a hydraulic power source turn-off instruction sent by the controller, the driver controls the two-channel motor to descend and stop rotating according to a fixed rotating speed signal, and the servo controller collects oil pressure and temperature information in the power source to participate in closed-loop control. The device has the advantages of being high in integration degree, small in size and light in weight.

Description

Technical Field

[0001] The invention belongs to the technical field of quadruped robots, and in particular relates to a highly integrated lightweight hydraulic power source. Background Art

[0002] The common driving modes of quadruped robots are pneumatic, electric, hydraulic and hybrid. Among them, hydraulic drive is widely used in robot drive systems due to its advantages of high load, high stability and high power density. The hydraulic power source is a hydraulic component that provides power in the hydraulic drive system. Its function is to convert mechanical energy into liquid pressure energy and provide hydraulic energy for the 12-way actuators on the driving joints of the quadruped robot. It is the core component of the quadruped robot. At the same time, the hydraulic power source is a hydraulic system composed of components such as motors, hydraulic pumps, booster tanks, one-way valves, oil filters and overflow valves. Due to the limited space on the quadruped robot and the weight limit requirements, in order to meet the robot's use requirements, the hydraulic power source must also have the advantages of high integration, compact structure and light weight. Therefore, highly integrated, lightweight and miniaturized hydraulic power sources have good development prospects in the field of robot drive.

[0003] At present, foreign companies that have mastered more advanced servo hydraulic actuators include the Italian Institute of Technology (IIT) and Boston Dynamics (BD). Among them, the Italian Institute of Technology (ITT) has developed a quadruped robot, HyQ, that can perform highly dynamic tasks by combining hydraulic devices with electric motors. The BigDog hydraulic power system developed by Boston Dynamics (BD) in the United States consists of a gasoline engine, a variable piston pump, a hydraulic oil tank, a hydraulic main circuit, a battery, and 16 electro-hydraulic servo valves. The gasoline engine rotates driven by the heat energy generated by the combustion of gasoline; at the same time, it drives the piston pump to rotate, and the normal hydraulic oil in the hydraulic oil tank is pumped into the pump for pressurization to form a closed hydraulic main circuit; multiple energy conversions and multi-link transmissions cause large energy losses and low efficiency, and there are also problems with large volume and mass that will affect the structural design of the fuselage. At the same time, the company also developed a prototype of the CHEETAH robot, which imitated the structure of a wild cheetah and enhanced the flexibility of the fuselage, but the disadvantage is that the power system is separated from the body and cannot operate independently, and auxiliary devices are needed to maintain the hydraulic system to provide a large oil pressure output. Most of these robot hydraulic power sources have many external pipelines, low degree of integration, large space occupation, and heavy weight. In practical application, there are many key technologies that need to be broken through.

[0004] Domestic research on robot hydraulic power sources is mainly carried out by universities and research institutes. The airborne power source of the quadruped robot developed by Shandong University consists of a 22kW single-cylinder two-stroke kart engine, a variable piston pump, an airborne hydraulic station and its fuel tank, heat exchange, exhaust, transmission, speed control and status monitoring unit. However, due to the installation of a chain transmission mechanism between the engine and the hydraulic pump, the output speed of the engine is reduced as the speed input of the hydraulic pump, resulting in a large volume of the hydraulic power unit, low energy efficiency, high noise and low integration. The quadruped robot "Little Elephant" of Shanghai Jiaotong University uses lithium batteries as a power source, drives the hydraulic pump through an electric motor, and finally outputs pressure oil to drive the motor hydraulic compound drive (Hy-Mo). It has a relatively simple system, but the degree of integration still needs to be improved, and the quality and volume are still large.

[0005] Therefore, it is of great significance to provide a highly integrated, lightweight and miniaturized hydraulic power source. Summary of the invention

[0006] The purpose of the present invention is to provide a highly integrated lightweight hydraulic power source, which should have the advantages of high integration, small size and light weight in structure, can meet the needs of installation and use in narrow spaces on robots, have high power density, meet the self-weight requirements of quadruped robots, and maintain the robot's movement stability.

[0007] The technical solution to achieve the purpose of the present invention is: A highly integrated lightweight hydraulic power source comprises a power source housing, an oil tank housing fixedly mounted in a central hole in the middle of the power source housing, a dual-channel motor-dosing pump structure symmetrically mounted on the left and right sides of the power source housing, an accumulator mounted in the power source housing, a temperature-pressure composite sensor and a high-pressure sensor integrated on the power source housing, and when receiving a start command from the control system, the motor in the dual-channel motor-dosing pump structure is driven to rotate, and the hydraulic pump is driven to rotate and output flow while the motor rotates, so as to pressurize the accumulator and provide a high-pressure oil source for 12-way hydraulic actuator joints; when receiving a hydraulic power source shutdown command, the driver controls the motor in the dual-channel motor-dosing pump structure to decrease and stop rotating according to a fixed speed signal.

[0008] Preferably, the power source housing is equipped with a filler port plug, a high-pressure filler nozzle, an electrical connector, a high-pressure filter, a high-pressure safety valve, a one-way valve, a low-pressure inlet and outlet nozzle assembly, a vent valve, a low-pressure safety valve assembly, a hydraulic pump and a motor to form a dual-channel motor-dosing pump structure; A hydraulic pump is installed in the holes on the left and right sides of the power source housing respectively, and the transmission shaft of the hydraulic pump is connected to the motor shaft of the motor through a spline, and the motor is connected to the power source housing; The oil filling port plug and the high-pressure oil inlet and outlet nozzle are installed in the same internal hole of the power source housing, the low-pressure oil inlet and outlet nozzle assembly is installed inside the power source housing, and the electrical connector is fixedly installed in the square groove of the power source housing; The bleed valve and the low-pressure safety valve assembly are installed inside the power source housing through threads; The high-pressure safety valve is connected to the threaded hole inside the power source housing, and the high-pressure safety valve is sealed by contacting the conical surface of the power source housing; High-pressure filters are respectively installed in the holes on both sides of the power source housing, and are limited by stepped holes. A plug is installed at the installation hole position of each filter to block the oil port, and the high-pressure filter limits the plug; One-way valves are respectively installed at the oil discharge waist grooves of the hydraulic pump on both sides of the power source housing, and the installation direction of the one-way valve is that the conical head faces the installation position of the hydraulic pump; a plug is installed at each one-way valve installation orifice position to block the oil port.

[0009] Preferably, a star ring, a tank spring, a tank piston, a tank end cover and a tank plug are installed in the tank housing. The tank housing, the star ring, the tank spring, the tank piston, the tank end cover and the tank plug constitute a spring-pressurized tank. The tank piston is installed in the center hole of the tank housing. The tank housing guides the tank piston. The tank spring is installed in the annular groove of the tank piston. The tank end cover and the tank housing are fixedly connected by screws. The tank piston and the tank end cover guide the tank spring. The tank plug is threadedly connected to the center threaded hole of the tank end cover. The power source housing and the tank end cover limit the tank piston.

[0010] Preferably, the power source housing is provided with an external pump station plug, an oil return pipe joint, and an oil outlet pipe joint connected to the inside of the power source housing, and is sealed with the power source housing via an O-ring.

[0011] Preferably, the motor is an oil-immersed motor, the motor is connected to the power source housing by screws, and the motor and the hydraulic pump are sealed by a fifth O-ring.

[0012] Preferably, the power source housing is sealed with the hydraulic pump via a third O-ring, and is sealed with the oil tank housing via a fourth O-ring.

[0013] Preferably, the oil filling port plug and the high-pressure oil inlet and outlet nozzle are sealed by a first O-ring, and the bleed valve and low-pressure safety valve assembly are installed inside the power source housing through threads and sealed by an O-ring.

[0014] Preferably, the detection boss of the high-pressure sensor is installed inside the power source housing, fixedly connected by four sets of screws, and sealed by two O-rings.

[0015] Preferably, the plug is sealed with the power source housing via a retaining ring and a second O-ring, and the high-pressure filter, the one-way valve and the power source housing are sealed with two O-rings.

[0016] Preferably, the accumulator is installed in a threaded hole inside the power source housing through a threaded connection, and the end face is sealed by an O-ring.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) The invention adopts an onboard hydraulic power solution of "dual-channel motor-hydraulic pump + accumulator" in the highly integrated small and lightweight hydraulic power source. Compared with a single-channel, it can not only meet the average power and instantaneous high power requirements, but also continue to work for a short time when a single-side failure occurs. When the instantaneous action requires a large flow rate, the accumulator can reduce pressure pulsation and maintain the system pressure as an auxiliary energy source of the system.

[0018] (2) In the highly integrated small and lightweight hydraulic power source of the present invention, 3D printing technology is used instead of traditional machining solutions to optimize the structural layout of the power source, making the layout of each part more compact, ensuring strength while minimizing the power source shell material, and selecting aluminum alloy for printing to reduce the weight of the power source shell, thereby realizing a lightweight and miniaturized design of the hydraulic power source.

[0019] (3) In the highly integrated small and lightweight hydraulic power source of the present invention, the oil channel layout is rationally optimized. By shortening the flow channel length between the oil tank and the oil suction port of the hydraulic pump, between the hydraulic pump outlet and the oil outlet pipe joint, and between the return pipe joint and the oil tank, the volume of the hydraulic pipeline and the influence of oil expansion are reduced, thereby achieving stronger anti-pollution ability and less energy consumption.

[0020] (4) In the highly integrated small and lightweight hydraulic power source of the present invention, the motor, hydraulic pump, one-way valve, high-pressure safety valve, low-pressure safety valve, oil tank, accumulator, high-pressure filter, high-pressure sensor, temperature-pressure composite sensor, high- and low-pressure filling valves, etc. are integrated on the power source housing, thereby improving the integration level of the power source and realizing real-time feedback of pressure and temperature information.

[0021] (5) The present invention can realize a highly integrated, small and lightweight design of the power source under the condition of limited robot space structure, which meets the practical use of the quadruped robot. Therefore, it has good practical use value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a partial cross-sectional view of the front view of the patented highly integrated small high-hydraulic power source.

[0023] Figure 2 It is a partial cross-sectional view from above of a highly integrated small and lightweight hydraulic power source.

[0024] In the figure, 1-power source housing, 2-external pump station plug, 3-temperature and pressure composite sensor, 4-return oil pipe joint, 5-oil filling port plug, 6-high-pressure filling nozzle, 7-first O-ring, 8-electric connector, 9-high-pressure sensor, 10-plug, 11-retaining ring, 12-second O-ring, 13-high-pressure filter, 14-high-pressure safety valve, 15-oil outlet pipe joint, 16-accumulator, 17-check valve, 18-low-pressure inlet and outlet nozzle assembly, 19-bleed valve, 20-low-pressure safety valve assembly, 21-hydraulic pump, 22-third O-ring, 23-fourth O-ring, 24-fifth O-ring, 25-tank housing, 26-star ring, 27-tank spring, 28-tank piston, 29-tank end cover, 30-tank plug, 31-motor. DETAILED DESCRIPTION

[0025] The power source for hydraulic drive of a robot provided by the present invention adopts an onboard hydraulic power solution of "dual-channel motor-dosing pump + accumulator", and adopts a permanent magnet synchronous motor to drive the dosing pump to realize oil supply and oil return. When the servo driver receives the start command of the control system, it drives the two-channel motor to rotate. While the motor rotates, it drives the hydraulic pump to rotate at high speed and output flow, pressurizes the accumulator and provides a high-pressure oil source for the 12-way hydraulic actuator joints. When the driver receives the hydraulic power source shutdown command issued by the controller, the driver controls the two-channel motor to decrease and stop rotating according to the fixed speed signal, and the servo controller collects the oil pressure and temperature information in the power source to participate in closed-loop control.

[0026] The highly integrated small lightweight hydraulic power source of the present invention is mainly composed of a motor, a hydraulic pump, a power source housing, a servo controller, a one-way valve, a high-pressure safety valve, a low-pressure safety valve, an oil tank, an accumulator, a high-pressure filter, a high-pressure sensor, a temperature-pressure composite sensor, a high- and low-pressure filling valve, a pipe joint, a sealing member, and the like. Figure 1 shown.

[0027] In order to achieve the highly integrated design goal of the hydraulic power source, all components of the power source system are integrated on the power source housing to achieve integrated installation of the hydraulic power source.

[0028] In order to achieve the goal of small and lightweight design of the actuator, the power source housing is made of aluminum alloy material, and the oil circuit is tightly laid out using 3D printing technology. The overall wall thickness of the power source housing, the oil circuit length and the installation position of the components are reasonably calculated and optimized; the housing adopts integrated design technology to effectively reduce the threaded mounting hole structure. The above two designs can effectively reduce the overall size and overall weight of the hydraulic power source.

[0029] Combine the following Figure 1 and Figure 2The specific details and working conditions of the highly integrated small and lightweight hydraulic power source proposed in this patent are described in detail.

[0030] The main structure of the highly integrated small lightweight hydraulic power source of the present invention includes a power source housing 1, an external pump station plug 2, a temperature and pressure composite sensor 3, a return oil pipe joint 4, an oil filling port plug 5, a high-pressure oil filling nozzle 6, an electrical connector 8, a high-pressure sensor 9, a plug 10, a retaining ring 11, a high-pressure filter 13, a high-pressure safety valve 14, an oil outlet pipe joint 15, an accumulator 16, a one-way valve 17, a low-pressure inlet and outlet nozzle assembly 18, a venting valve 19, a low-pressure safety valve assembly 20, a hydraulic pump 21, a fuel tank housing 25, a star ring 26, a fuel tank spring 27, a fuel tank piston 28, a fuel tank end cover 29, a fuel tank plug 30, a motor 31, a first O-ring 7, a second O-ring 12, a third O-ring 22, a fourth O-ring 23 and a fifth O-ring 24.

[0031] The two hydraulic pumps 21 are installed in the holes on the left and right sides of the power source housing 1, and the power source housing 1 and the hydraulic pump 21 are sealed by a third O-ring 22; the motor shaft of the motor 31 is connected to the drive shaft of the hydraulic pump 21 by a spline. In order to improve the heat dissipation capacity of the motor 31, the motor 31 is an oil-immersed motor. The motor 31 is connected to the power source housing 1 by screws, and the motor 31 and the hydraulic pump 21 are sealed by a fifth O-ring 24.

[0032] The oil tank housing 25, the star ring 26, the oil tank spring 27, the oil tank piston 28, the oil tank end cover 29, and the oil tank plug 30 constitute a spring-pressurized oil tank. The function of the oil tank in the hydraulic power source is to store the oil required by the system, dissipate heat, and provide the oil pump with a certain pressure to improve the starting performance of the oil pump. The oil tank housing 25 is installed in the center hole in the middle of the power source housing 1 and is fixedly connected by screws. The power source housing 1 and the oil tank housing 25 are sealed by a fourth O-ring 23; the oil tank piston 28 is installed in the center hole of the oil tank housing 25, and the oil tank housing 25 guides the oil tank piston 28. The oil tank housing 25 and the oil tank piston 28 are sealed by a star ring 26; the oil tank spring 27 is installed in the annular groove of the oil tank piston 28, and the oil tank end cover 29 is fixedly connected to the oil tank housing 25 by screws. The oil tank piston 28 and the oil tank end cover 29 guide the oil tank spring 27; the oil tank plug 30 is threadedly connected to the center threaded hole of the oil tank end cover 29; the power source housing 1 and the oil tank end cover 29 limit the oil tank piston 28.

[0033] The oil filling port plug 5 and the high-pressure oil inlet and outlet nozzle 6 are installed in the same internal hole of the power source housing 1 through threads. The high-pressure oil inlet and outlet nozzle 6 is axially positioned through the step of the installation hole. The oil filling port plug 5 is axially limited by the high-pressure oil inlet and outlet nozzle 6. The oil filling port plug 5 and the high-pressure oil inlet and outlet nozzle 6 are sealed by the first O-ring 7; the low-pressure oil inlet and outlet nozzle assembly 18 is installed in the power source housing 1 through threads, and it is composed of the oil filling port plug 5, the low-pressure oil inlet and outlet nozzle and the first O-ring 7. The installation method is the same as the installation method of the high-pressure oil inlet and outlet nozzle assembly. The vent valve 19 and the low-pressure safety valve assembly 20 are installed in the power source housing 1 through threads and sealed by O-rings.

[0034] The temperature and pressure composite sensor 3 is connected to the internal threaded hole of the power source housing 1 through its threaded mounting head, and the end face sealing is achieved by an O-ring; the high-pressure sensor 9 is fastened to the power source housing 1 by screws, and the detection boss of the high-pressure sensor 9 is installed inside the power source housing 1 and fixedly connected by four sets of screws, and the sealing is achieved by two O-rings; the high-pressure safety valve 14 is connected to the internal threaded hole of the power source housing 1 through threaded mounting, and the conical surface contact seal between the high-pressure safety valve 14 and the power source housing 1 is achieved.

[0035] The external pump station plug 2, the return oil pipe joint 4, and the oil outlet pipe joint 15 are connected to the internal threaded holes of the power source housing 1 through threads, and the external pump station plug 2, the return oil pipe joint 4, the oil outlet pipe joint 15 and the power source housing 1 are all sealed by O-rings; the electrical connector 8 is installed in the square groove of the power source housing 1 and is fixedly connected by two sets of screws.

[0036] Two high-pressure filters 13 are installed in the holes on both sides of the power source housing 1 and are limited by stepped holes. The high-pressure filters 13 and the power source housing 1 are sealed by two O-rings. Two plugs 10 are respectively installed at the two installation openings of the high-pressure filters 13 on the power source housing 1 through threaded connections to block the oil port. The high-pressure filters 13 limit the plugs 10, and the plugs 10 and the power source housing 1 are sealed by a retaining ring 11 and a second O-ring 12.

[0037] Two one-way valves 17 are installed at the oil discharge waist groove of the hydraulic pump 21 on both sides of the power source housing 1 through threaded connection. The installation direction of the one-way valve 17 is that the conical head faces the installation position of the hydraulic pump 21, and the one-way valve 17 and the power source housing 1 are sealed by an O-ring; two plugs 10 are respectively installed at the two one-way valve 17 installation orifice positions on the power source housing 1 through threaded connection to block the oil port, and the plug 10 and the power source housing 1 are sealed by a retaining ring 11 and a second O-ring 12, and the one-way valve 17 only allows oil to flow from the installation position of the hydraulic pump 21 to the installation position of the plug 10.

[0038] The accumulator 16 is installed in the threaded hole inside the power source housing 1 through a threaded connection, and the end surface is sealed by an O-ring.

[0039] The power source is powered by a battery. During the movement, the controller commands are received to realize the speed / pressure closed loop. The motor 31 drives the hydraulic pump 21 to rotate. The hydraulic pump 21 moves in the cylinder through the plunger, converting the low-pressure oil in the oil tank into high-pressure oil and delivering it to the system. The oil passes through the one-way valve 17 and the high-pressure filter 13 in turn, and flows to the 12-way actuator through the oil outlet pipe joint 15 and the oil pipe to provide a certain flow of pressure oil. The external hydraulic oil returns to the oil tank through the return pipe joint 4. Among them, the one-way valve 17 is located at the outlet of the oil pump to prevent the oil from flowing back. The high-pressure filter 13 ensures the cleanliness of the system by intercepting the solid particles in the high-pressure oil, thereby improving the reliability of the system. The accumulator 16 communicates with the high-pressure oil circuit, mainly serving as an auxiliary energy source for the system, while reducing oil pulsation and absorbing hydraulic shock. The high-pressure safety valve 14 and the low-pressure safety valve play a role of safety protection in the system, and release the pressure when the pressure is higher than the opening pressure setting value. The temperature-pressure composite sensor 3 is used to monitor the oil temperature and pressure of the oil return line, and the high-pressure sensor 9 is used to monitor the oil pressure at the outlet of the hydraulic pump and participate in the pressure closed loop of the power source control system as a feedback signal.

[0040] The hydraulic power source of the present invention adopts an onboard hydraulic power solution of "dual-channel motor-dosing pump + accumulator". Compared with a single channel, it can continue to work for a short time when a single-side failure occurs. The motor, hydraulic pump, one-way valve, high-pressure safety valve, low-pressure safety valve, oil tank, accumulator, high-pressure filter, high-pressure sensor, temperature-pressure composite sensor, high-low pressure filling valve, etc. are integrated on a power source housing, and 3D printing technology is used to reasonably arrange the installation positions of the oil circuit and components while ensuring strength, making the structure more compact and effectively improving the integration and miniaturization of the hydraulic power source; at the same time, the power source housing designed by 3D printing uses the least processing materials while ensuring strength, and uses aluminum alloy for printing, which greatly reduces the overall weight of the hydraulic power source and effectively improves the lightweight degree of the hydraulic power source.

[0041] The above-mentioned specific examples are only preferred examples of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highly integrated lightweight hydraulic power source, characterized in that: The invention comprises a power source housing (1), an oil tank housing (25) fixedly mounted in a central hole in the middle of the power source housing (1), a dual-channel motor-dosing pump structure symmetrically mounted on the left and right sides of the power source housing (1), an accumulator (16) mounted in the power source housing (1), and a temperature-pressure composite sensor (3) and a high-pressure sensor (9) integratedly mounted on the power source housing (1). When receiving a start command from a control system, the motor in the dual-channel motor-dosing pump structure is driven to rotate, and the motor rotates while driving the hydraulic pump to rotate and output flow, thereby charging the accumulator (16) and providing a high-pressure oil source for 12 hydraulic actuator joints; when receiving a hydraulic power source shut-off command, the driver controls the motor in the dual-channel motor-dosing pump structure to decrease and stop rotating according to a fixed speed signal.

2. A highly integrated lightweight hydraulic power source according to claim 1, characterized in that: The power source housing (1) is equipped with an oil filling port plug (5), a high-pressure oil filling nozzle (6), an electrical connector (8), a high-pressure filter (13), a high-pressure safety valve (14), a one-way valve (17), a low-pressure oil inlet and outlet nozzle assembly (18), a vent valve (19), a low-pressure safety valve assembly (20), a hydraulic pump (21) and a motor (31), forming a dual-channel motor-dosing pump structure; A hydraulic pump (21) is installed in the holes on the left and right sides of the power source housing (1), respectively. The transmission shaft of the hydraulic pump (21) is connected to the motor shaft of the motor (31) via a spline, and the motor (31) is connected to the power source housing (1); The oil filling port plug (5) and the high-pressure oil inlet and outlet nozzle (6) are installed in the same internal hole of the power source housing (1), the low-pressure oil inlet and outlet nozzle assembly (18) is installed inside the power source housing (1), and the electrical connector (8) is fixedly installed in the square groove of the power source housing (1); The air release valve (19) and the low-pressure safety valve assembly (20) are installed inside the power source housing (1) through threads; The high-pressure safety valve (14) is connected to the internal threaded hole of the power source housing (1), and a conical surface contact seal between the high-pressure safety valve (14) and the power source housing (1) is achieved; High-pressure filters (13) are respectively installed in holes on both sides of the power source housing (1), and are limited by stepped holes. A plug (10) is installed at the installation hole position of each filter (13) to block the oil port, and the high-pressure filter (13) limits the plug; One-way valves (17) are respectively installed at the oil discharge waist grooves of the hydraulic pump (21) on both sides of the power source housing (1), and the installation direction of the one-way valve (17) is such that the conical head faces the installation position of the hydraulic pump (21); a plug (10) is installed at the installation hole position of each one-way valve (17) to block the oil port.

3. A highly integrated lightweight hydraulic power source according to claim 1, characterized in that: The fuel tank housing (25) is provided with a star ring (26), a fuel tank spring (27), a fuel tank piston (28), a fuel tank end cover (29) and a fuel tank plug (30). The fuel tank housing (25), the star ring (26), the fuel tank spring (27), the fuel tank piston (28), the fuel tank end cover (29) and the fuel tank plug (30) form a spring pressurized fuel tank. The fuel tank piston (28) is installed in the center hole of the fuel tank housing (25). The fuel tank housing (25) is provided with a spring pressurized fuel tank. The plug (28) plays a guiding role. The oil tank spring (27) is installed in the annular groove of the oil tank piston (28). The oil tank end cover (29) and the oil tank housing (25) are fixedly connected by screws. The oil tank piston (28) and the oil tank end cover (29) play a guiding role for the oil tank spring (27). The oil tank plug (30) is connected to the central threaded hole of the oil tank end cover (29) by threading. The power source housing (1) and the oil tank end cover (29) limit the oil tank piston (28).

4. A highly integrated lightweight hydraulic power source according to claim 2, characterized in that: The power source housing (1) is provided with an external pump station plug (2), an oil return pipe joint (4), and an oil outlet pipe joint (15) which are connected to the inside of the power source housing (1), and are sealed with the power source housing (1) via O-rings.

5. A highly integrated lightweight hydraulic power source according to claim 2, characterized in that: The motor (31) is an oil-immersed motor; the motor (31) is connected to the power source housing (1) via screws; and the motor (31) and the hydraulic pump (21) are sealed via a fifth O-ring (24).

6. A highly integrated lightweight hydraulic power source according to claim 2, characterized in that: The power source housing (1) is sealed with the hydraulic pump (21) via a third O-ring (22), and is sealed with the oil tank housing (25) via a fourth O-ring (23).

7. A highly integrated lightweight hydraulic power source according to claim 2, characterized in that: The oil filling port plug (5) and the high-pressure oil inlet and outlet nozzle (6) are sealed by a first O-ring (7), and the air release valve (19) and the low-pressure safety valve assembly (20) are installed inside the power source housing (1) through threads and are sealed by the O-ring.

8. A highly integrated lightweight hydraulic power source according to claim 2, characterized in that: The detection boss of the high-pressure sensor (9) is mounted inside the power source housing (1), fixedly connected by four sets of screws, and sealed by two O-rings.

9. A highly integrated lightweight hydraulic power source according to claim 2, characterized in that: The plug (10) and the power source housing (1) are sealed via a retaining ring (11) and a second O-ring (12), and the high-pressure filter (13), the one-way valve (17) and the power source housing (1) are sealed via two O-rings.

10. A highly integrated lightweight hydraulic power source according to claim 1, characterized in that: The accumulator (16) is installed in the internal threaded hole of the power source housing (1) through a threaded connection, and the end surface is sealed by an O-ring.

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