CN108757879B - Hydraulic-mechanical composite driving device - Google Patents

Hydraulic-mechanical composite driving device Download PDF

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CN108757879B
CN108757879B CN201810516604.XA CN201810516604A CN108757879B CN 108757879 B CN108757879 B CN 108757879B CN 201810516604 A CN201810516604 A CN 201810516604A CN 108757879 B CN108757879 B CN 108757879B
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motor
hydraulic
controller
adder
hydraulic motor
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CN108757879A (en
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权龙�
葛磊
刘赫
王波
张旭飞
王鹤
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Taiyuan University of Technology
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Taiyuan University of Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
    • F16H61/425—Motor capacity control by electric actuators

Abstract

The invention discloses a hydraulic-mechanical compound driving device which comprises an electric motor, a hydraulic motor, a transmission box assembly, a bearing assembly, a ball screw transmission assembly, a displacement/speed sensor, a rotating speed/torque/rotating angle sensor, an electronic switch, an adder, a controller, a motor controller and a hydraulic circuit. The hydraulic-mechanical composite driving device connects an electric motor and a hydraulic motor in series to form a power source for driving, and converts rotary motion into linear motion through a transmission case and a ball screw pair. The hydraulic-mechanical composite driving device has the advantages that the advantages of the electric cylinder are kept, the advantage of high power density of a hydraulic system is added, and the power/weight ratio of the electric cylinder can be improved under the condition of smaller size through composite driving of hydraulic pressure and the electric motor so as to adapt to the occasions of impact and heavy load.

Description

Hydraulic-mechanical composite driving device
Technical Field
The invention belongs to the technical field of mechanical-electrical-hydraulic integrated transmission, and particularly relates to a hydraulic-mechanical composite driving device.
Background
With the rapid development of modern industry and equipment manufacturing industry, the application of the electric cylinder in the mechanical field is increasing, and the requirement of engineering personnel on the electric cylinder is higher and higher. The electric cylinder is an electro-mechanical actuator integrating a servo motor and a ball screw, and has the functions of converting the rotary motion of the servo motor into linear motion and converting the accurate rotating speed control, the accurate rotation angle control and the accurate torque control of the servo motor into linear, speed, position and thrust control. Compared with a hydraulic cylinder and a pneumatic cylinder, the electric cylinder has the characteristics of high transmission efficiency, strong environment adaptability, high positioning precision, convenience in maintenance, high reliability and safety, stability in operation, long service life, quick response, good synchronism and the like. The device is widely applied to equipment such as a vertical feeding shaft of a machine tool, a stretching and clamping mechanism of textile equipment, testing equipment and the like.
However, the existing electric cylinder has the biggest defect of weak bearing capacity, is mainly used in light-load occasions and is difficult to be used in impact load and heavy-load occasions, and some companies realize the situation by increasing the power of the motor, but the space requirement is large, and the electric cylinder is not suitable for occasions with limited installation size.
Disclosure of Invention
In order to overcome the defects of the electro-mechanical actuator, the invention provides a hydraulic-mechanical compound driving device. The hydraulic-mechanical compound driving device connects an electric motor and a hydraulic motor in series to form a power source for driving, and converts rotary motion into linear motion through a transmission box assembly and a ball screw pair. The hydraulic-mechanical composite driving device has the advantages that the advantages of the electric cylinder are kept, the advantage of high power density of a hydraulic system is added, and the power/weight ratio of the electric cylinder can be improved under the condition of smaller size through composite driving of hydraulic pressure and the electric motor so as to adapt to the occasions of impact and heavy load.
A hydraulic-mechanical compound driving device comprises an electric motor, a hydraulic motor, a transmission box assembly, a bearing assembly, a ball screw transmission assembly, a displacement/speed sensor, a rotating speed/torque/rotating angle sensor, an I electronic switch, an II electronic switch, an I adder, an I controller, an II adder, an II controller, a motor controller and a hydraulic circuit;
the hydraulic motor is arranged on one side of the transmission box assembly through a bolt, a driving wheel in the transmission box assembly is arranged on a shaft of the hydraulic motor, and the electric motor is connected with the hydraulic motor; the ball screw transmission assembly is arranged at the output end of the transmission box assembly, a driven wheel in the transmission box assembly is arranged on a shaft of a screw in the ball screw transmission assembly, and the shaft of the screw in the ball screw transmission assembly is supported by a bearing assembly; a displacement/speed sensor is arranged at the tail end of the ball screw transmission component, and the detection signal and the setting signal U of the displacement/speed sensorfThe first electronic switch is arranged between the displacement/speed sensor and the first adder, and the output end of the first adder is connected with the first controller; the output end of the first controller is connected with the second adder; electric motorThe tail end of the speed/torque/rotation angle sensor is provided with a speed/torque/rotation angle sensor, the output end of the speed/torque/rotation angle sensor is connected with the output end of the first controller through a second electronic switch and a second adder, and the output end of the second adder is connected with the second controller; the output end of the second controller is connected with a motor controller, and the motor controller is connected with the motor; the hydraulic motor is connected with the hydraulic loop;
the displacement/speed sensor converts the displacement and speed values of the piston rod into an electric signal UsAnd a setting signal UfAnd the rotating speed/torque/rotating angle sensor converts the rotating speed/torque/rotating angle of the motor into an electric signal, the electric signal and an output signal of the first controller are operated in the second adder, the operation result is input into the second controller, the second controller sends a control instruction to the motor controller, and the motor controller receives the control instruction and then controls the rotating speed, the torque and the rotating angle of the motor.
A hydraulic-mechanical compound driving device comprises a hydraulic motor, a transmission box assembly, a bearing assembly, a ball screw transmission assembly, a displacement/speed sensor, an I electronic switch, an II electronic switch, an I adder, an I controller, an II adder, an II controller, a hydraulic motor controller, a rotating speed/torque/swing angle sensor and a hydraulic circuit;
the hydraulic motor is arranged on one side of the transmission box assembly through a bolt, a driving wheel in the transmission box assembly is arranged on a shaft of the hydraulic motor, the ball screw transmission assembly is arranged at the output end of the transmission box assembly, a driven wheel in the transmission box assembly is arranged on a shaft of a screw in the ball screw transmission assembly, and the shaft of the screw in the ball screw transmission assembly is supported by a bearing assembly; a displacement/speed sensor is arranged at the tail end of the ball screw transmission component, and the detection signal and the setting signal U of the displacement/speed sensorfThe first electronic switch is arranged between the displacement/speed sensor and the first adder, and the output end of the first adder is connected with the first controller; the output end of the first controller is connected with the second adder; the hydraulic motor is connected with the hydraulic loop;
the displacement/speed sensor converts the displacement and speed values of the piston rod into an electric signal UsAnd a setting signal UfCalculating in the I adder and inputting the calculation result into the I controller; the rotation speed/torque/swing angle sensor converts the swing angle of the hydraulic motor into an electric signal, the electric signal and an output signal of the controller I are calculated in the adder II, the calculation result of the adder II is input into the controller II, the controller II sends an instruction to the hydraulic motor controller, and the hydraulic motor controller receives the control instruction and then controls the swing angle of the hydraulic motor.
The power source is an electric motor or a hydraulic motor or the series connection of the hydraulic motor and the electric motor or the hydraulic motor is a fixed displacement hydraulic motor or a variable displacement hydraulic motor.
The hydraulic motor is an axial piston motor or a radial piston motor or other forms of hydraulic motors.
The variable hydraulic motor is a manual variable motor or a mechanical variable motor or an electronic proportional control variable motor.
The hydraulic motor is a constant pressure motor or a constant displacement motor or a constant power motor or a compound form of the motors.
The hydraulic motor may also be a compressed air driven motor.
The motor is an alternating current asynchronous motor or a switched reluctance motor or a direct current motor or a servo motor.
The hydraulic circuit is any one of the existing hydraulic circuits for controlling the rotation of the hydraulic motor.
Compared with the prior art, the invention has the following remarkable advantages:
1. the invention maintains the advantages of the electric cylinder, has the advantage of high power density of a hydraulic system, increases the power/weight ratio, realizes the conversion of hydraulic rotation and mechanical straight line, and solves the defect that the traditional electric cylinder is difficult to adapt to heavy load and impact vibration.
2. The invention improves the bearing capacity of the actuator on the premise of controlling the size of the cylinder body, and can be suitable for occasions with limited installation size, heavy load, impact and vibration. The device can work for a long time without failure in a severe environment, and can realize high-strength, high-speed and high-precision movement.
Drawings
FIG. 1 is a schematic diagram of a hydro-mechanical compound drive arrangement according to a first embodiment of the present invention;
fig. 2 is a perspective view of a hydro-mechanical compound drive apparatus according to a first embodiment of the present invention;
FIG. 3 is a cross-sectional view of a first embodiment of the hydro-mechanical compound drive of the present invention;
FIG. 4 is a schematic diagram of a second embodiment of the present invention;
FIG. 5 is a cross-sectional view of a second embodiment of the present invention;
FIG. 6 is a cross-sectional view of a third embodiment of the present invention;
FIG. 7 is a cross-sectional view of a fourth embodiment of the present invention;
fig. 8 is a schematic diagram of a hydraulic circuit of the present invention.
In the figure, 1-an electric motor, 2-a hydraulic motor, 3-a transmission box component, 4-a bearing component, 5-a ball screw transmission component, 6-a displacement/speed sensor, 7-a rotating speed/torque/rotating angle sensor, 8-an electronic switch I, 9-an electronic switch II, 10-an adder I, 11-a controller I, 12-an adder II, 13-a controller II, 14-a motor controller, 15-a hydraulic circuit, 16-a closed hydraulic pump, 17-an overflow valve I, 18-an overflow valve II, 19-an overflow valve III, 20-a check valve I, 21-a check valve II, 22-a filter, 23-a supplementary oil pump, 24-an oil tank and 25-a hydraulic motor controller, 26-speed/torque/yaw angle sensor.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
A hydraulic-mechanical compound driving device comprises an electric motor 1, a hydraulic motor 2, a transmission case component 3, a bearing component 4, a ball screw transmission component 5, a displacement/speed sensor 6, a rotating speed/torque/rotating angle sensor 7, an I electronic switch 8, an II electronic switch 9, an I adder 10, an I controller 11, an II adder 12, an II controller 13, a motor controller 14 and a hydraulic circuit 15;
the hydraulic motor is arranged on one side of the transmission box assembly through a bolt, a driving wheel in the transmission box assembly is arranged on a shaft of the hydraulic motor, and the electric motor is connected with the hydraulic motor; the ball screw transmission assembly is arranged at the output end of the transmission box assembly, a driven wheel in the transmission box is arranged on a shaft of a screw in the ball screw transmission assembly, and the shaft of the screw in the ball screw transmission assembly is supported by a bearing assembly; a displacement/speed sensor is arranged at the tail end of the ball screw transmission component, and the detection signal and the setting signal U of the displacement/speed sensorfThe first electronic switch is arranged between the displacement/speed sensor and the first adder, and the output end of the first adder is connected with the first controller; the output end of the first controller is connected with the second adder; the tail end of the motor is provided with a rotating speed/torque/rotating angle sensor, the output end of the rotating speed/torque/rotating angle sensor is connected with the output end of the first controller through a second electronic switch and a second adder, and the output end of the second adder is connected with the second controller; the output end of the second controller is connected with a motor controller, and the motor controller is connected with the motor; the hydraulic motor is connected with the hydraulic loop;
the displacement/speed sensor converts the displacement and speed values of the piston rod into an electric signal UsAnd a setting signal UfAnd the rotating speed/torque/rotating angle sensor converts the rotating speed/torque/rotating angle of the motor into an electric signal, the electric signal and an output signal of the first controller are operated in the second adder, the operation result is input into the second controller, the second controller sends a control instruction to the motor controller, and the motor controller receives the control instruction and then controls the rotating speed, the torque and the rotating angle of the motor.
A hydraulic-mechanical compound driving device comprises a hydraulic motor 2, a transmission box component 3, a bearing component 4, a ball screw transmission component 5, a displacement/speed sensor 6, an I electronic switch 8, an II electronic switch 9, an I adder 10, an I controller 11, an II adder 12, an II controller 13, a hydraulic motor controller 25, a rotating speed/torque/swing angle sensor 26 and a hydraulic circuit 15;
the hydraulic motor is arranged on one side of the transmission box assembly through a bolt, a driving wheel in the transmission box assembly is arranged on a shaft of the hydraulic motor, the ball screw transmission assembly is arranged at the output end of the transmission box assembly, a driven wheel in the transmission box assembly is arranged on a shaft of a screw in the ball screw transmission assembly, and the shaft of the screw in the ball screw transmission assembly is supported by a bearing assembly; a displacement/speed sensor is arranged at the tail end of the ball screw transmission component, and the detection signal and the setting signal U of the displacement/speed sensorfThe first electronic switch is arranged between the displacement/speed sensor and the first adder, and the output end of the first adder is connected with the first controller; the output end of the first controller is connected with the second adder; the hydraulic motor is connected with the hydraulic loop;
the displacement/speed sensor converts the displacement and speed values of the piston rod into an electric signal UsAnd a setting signal UfCalculating in the I adder and inputting the calculation result into the I controller; the rotation speed/torque/swing angle sensor converts the swing angle of the hydraulic motor into an electric signal, the electric signal and an output signal of the controller I are calculated in the adder II, the calculation result of the adder II is input into the controller II, the controller II sends an instruction to the hydraulic motor controller, and the hydraulic motor controller receives the control instruction and then controls the swing angle of the hydraulic motor.
The power source is an electric motor or a hydraulic motor or the series connection of the hydraulic motor and the electric motor or the hydraulic motor is a fixed displacement hydraulic motor or a variable displacement hydraulic motor.
The hydraulic motor is an axial piston motor or a radial piston motor or other forms of hydraulic motors.
The variable hydraulic motor is a manual variable motor or a mechanical variable motor or an electronic proportional control variable motor.
The hydraulic motor is a constant pressure motor or a constant displacement motor or a constant power motor or a compound form of the motors.
The hydraulic motor may also be a compressed air driven motor.
The motor is an alternating current asynchronous motor or a switched reluctance motor or a direct current motor or a servo motor.
The hydraulic circuit is any one of the existing hydraulic circuits for controlling the rotation of the hydraulic motor.
Example 1
As shown in fig. 1, 2 and 3, a hydraulic-mechanical compound drive device includes an electric motor 1, a hydraulic motor 2, a transmission case assembly 3, a bearing assembly 4, a ball screw transmission assembly 5, a displacement/speed sensor 6, a rotation speed/torque/rotation angle sensor 7, an i-th electronic switch 8, an ii-th electronic switch 9, an i-th adder 10, an i-th controller 11, an ii-th adder 12, an ii-th controller 13, a motor controller 14 and a hydraulic circuit 15.
The hydraulic motor is arranged on one side of the transmission box assembly through a bolt, a driving wheel in the transmission box assembly is arranged on a shaft of the hydraulic motor, and the electric motor is connected with the hydraulic motor; the ball screw transmission assembly is arranged at the output end of the transmission box assembly, a driven wheel in the transmission box assembly is arranged on a shaft of a screw in the ball screw transmission assembly, and the shaft of the screw in the ball screw transmission assembly is supported by a bearing assembly; a displacement/speed sensor is arranged at the tail end of the ball screw transmission component, and the detection signal and the setting signal U of the displacement/speed sensorfThe first electronic switch is arranged between the displacement/speed sensor and the first adder, and the output end of the first adder is connected with the first controller; the output end of the first controller is connected with the second adder; the tail end of the motor is provided with a rotating speed/torque/rotating angle sensor, the output end of the rotating speed/torque/rotating angle sensor is connected with the output end of the first controller through a second electronic switch and a second adder, and the output end of the second adder is connected with the second controller; the output end of the second controller is connected with a motor controller, and the motor controller is connected with the motor; the hydraulic motor is connected with the hydraulic circuit.
The displacement/speed sensor converts the displacement and speed values of the piston rod into an electric signal UsAnd a setting signal UfOperated in the I-th adder, and the operation result is input into the I-th adderThe controller I converts the rotating speed/torque/rotating angle of the motor into an electric signal by the rotating speed/torque/rotating angle sensor, the electric signal and an output signal of the controller I are calculated in the adder II, an operation result is input into the controller II, the controller II sends a control instruction to the motor controller, and the motor controller receives the control instruction and then controls the rotating speed, the torque and the rotating angle of the motor to operate.
The electric motor and the hydraulic motor are connected in series to jointly form a power source for driving, and the rotary motion driving piston rod moves linearly through the transmission box assembly and the ball screw pair.
When the first electronic switch and the second electronic switch are closed simultaneously, a closed loop is formed; when the first electronic switch is turned on and the second electronic switch is turned off, a semi-closed loop is formed; when the first electronic switch and the second electronic switch are opened simultaneously, an open loop is formed.
In the working process, the rotary motion of the electric motor and the hydraulic motor is converted into linear motion, and simultaneously the best advantages of the servo motor are as follows: accurate rotational speed control, accurate revolution control, accurate torque control turn into: the hydraulic motor has the advantages of accurate speed control, accurate position control and accurate thrust control, exerts the advantage of large power/weight ratio of the hydraulic motor, can work for a long time without failure in severe environment, and realizes high-strength, high-speed and high-precision movement.
Example 2
As shown in fig. 4 and 5, a hydro-mechanical compound drive device,
the hydraulic control system comprises a hydraulic motor 2, a transmission case component 3, a bearing component 4, a ball screw transmission component 5, a displacement/speed sensor 6, an I electronic switch 8, an II electronic switch 9, an I adder 10, an I controller 11, an II adder 12, an II controller 13, a hydraulic motor controller 25, a rotating speed/torque/swing angle sensor 26 and a hydraulic circuit 15;
the hydraulic motor is installed on one side of the transmission box component through a bolt, a driving wheel in the transmission box component is installed on a shaft of the hydraulic motor, the ball screw transmission component is installed at the output end of the transmission box component, and a driven wheel in the transmission box component is installed on a ball screw transmission deviceThe shaft of the lead screw in the ball screw transmission assembly is supported by a bearing assembly; a displacement/speed sensor is arranged at the tail end of the ball screw transmission component, and the detection signal and the setting signal U of the displacement/speed sensorfThe first electronic switch is arranged between the displacement/speed sensor and the first adder, and the output end of the first adder is connected with the first controller; the output end of the first controller is connected with the second adder; the hydraulic motor is connected with the hydraulic loop;
the displacement/speed sensor converts the displacement and speed values of the piston rod into an electric signal UsAnd a setting signal UfCalculating in the I adder and inputting the calculation result into the I controller; the rotation speed/torque/swing angle sensor converts the swing angle of the hydraulic motor into an electric signal, the electric signal and an output signal of the controller I are calculated in the adder II, the calculation result of the adder II is input into the controller II, the controller II sends an instruction to the hydraulic motor controller, and the hydraulic motor controller receives the control instruction and then controls the swing angle of the hydraulic motor.
Example 3
As shown in fig. 6, in the hydraulic-mechanical compound driving device, the electric motor is connected with the hydraulic motor, and the hydraulic motor is connected with the ball screw transmission assembly, so that the transmission box assembly is omitted, and the ball screw transmission assembly is directly driven by the electric motor and the hydraulic motor.
Example 4
As shown in fig. 7, a hydraulic-mechanical compound driving device is provided, in which a hydraulic motor is directly connected with a ball screw transmission pair assembly and is directly driven by the hydraulic motor alone.
Fig. 8 shows one of the hydraulic circuits in a hydro-mechanical compound drive apparatus of the present invention. The hydraulic circuit of fig. 8 includes a closed hydraulic pump 16, an i-th relief valve 17, an ii-th relief valve 18, an iii-th relief valve 19, an i-th check valve 20, an ii-th check valve 21, a filter 22, an oil replenishment pump 23, and an oil tank 24.
And the two oil ports of the closed hydraulic pump are respectively connected with the two oil ports of the hydraulic motor in the figure 1 through a pipeline A and a pipeline B. The two ends of the second overflow valve and the third overflow valve are respectively connected with a pipeline A and a pipeline B, the oil supplementing pump is connected with the first check valve and the second check valve through the filter and the first overflow valve, and the two check valves are respectively connected with the pipeline A and the pipeline B. The other oil port of the oil replenishing pump is connected with an oil tank, and the other valve port of the first overflow valve is connected with the oil tank. The hydraulic circuit solves the problem that the symmetrical pump-controlled asymmetric hydraulic cylinder needs a complex flow compensation circuit, is converted into symmetrical pump-controlled symmetrical motor control, and is suitable for a closed volume circuit.
The embodiments described above are only a part of the embodiments of the present technology, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Claims (7)

1. A hydro-mechanical compound drive, characterized by: the device comprises an electric motor (1), a hydraulic motor (2), a transmission box component (3), a bearing component (4), a ball screw transmission component (5), a displacement/speed sensor (6), a rotating speed/torque/rotating angle sensor (7), an I electronic switch (8), a II electronic switch (9), an I adder (10), an I controller (11), an II adder (12), an II controller (13), a motor controller (14) and a hydraulic loop (15);
the hydraulic motor (2) is installed on one side of the transmission box assembly (3) through a bolt, a driving wheel in the transmission box assembly (3) is installed on a shaft of the hydraulic motor (2), and the electric motor (1) is connected with the hydraulic motor (2); the ball screw transmission assembly (5) is arranged at the output end of the transmission box assembly (3), a driven wheel in the transmission box assembly (3) is arranged on a shaft of a screw in the ball screw transmission assembly (5), and the shaft of the screw in the ball screw transmission assembly (5) is supported by the bearing assembly (4); a displacement/speed sensor (6) is arranged at the tail end of the ball screw transmission component (5), and the detection signal and the setting signal U of the displacement/speed sensor (6)fThe first electronic switch (8) is arranged between the displacement/speed sensor (6) and the first adder (10), and the output end of the first adder (10) is connected with a first controller (11); the output end of the first controller (11) is connected with the second adder (12); electric driveA rotating speed/torque/rotating angle sensor (7) is installed at the tail end of the machine (1), the output end of the rotating speed/torque/rotating angle sensor (7) is connected with the output end of a controller I (11) through a second electronic switch (9) to form a second adder (12), and the output end of the second adder (12) is connected with a second controller (13); the output end of the second controller (13) is connected with a motor controller (14), and the motor controller (14) is connected with the motor (1); the hydraulic motor (2) is connected with a hydraulic circuit (15);
the displacement/speed sensor (6) converts the displacement and speed values of the piston rod into an electric signal UsAnd a setting signal UfThe method comprises the steps that operation is carried out in an I adder (10), the operation result is input into an I controller (11), the rotating speed/torque/rotating angle sensor (7) converts the rotating speed/torque/rotating angle of the motor (1) into an electric signal, the electric signal is operated in an II adder (12) together with an output signal of the I controller (11), the operation result is input into a II controller (13), the II controller (13) sends a control command to a motor controller (14), and the motor controller (14) controls the rotating speed, the torque and the rotating angle of the motor (1) after receiving the control command.
2. A hydro-mechanical compound drive as defined in claim 1 wherein: the power source is an electric motor (1) or a hydraulic motor (2) or the series connection of the hydraulic motor (2) and the electric motor (1) or the hydraulic motor (2) is a fixed-quantity hydraulic motor or a variable-quantity hydraulic motor.
3. A hydro-mechanical compound drive as defined in claim 1 wherein: the hydraulic motor (2) is an axial plunger motor or a radial plunger motor.
4. A hydro-mechanical compound drive as defined by claim 2 wherein: the variable hydraulic motor is a manual variable motor or an electronic proportional control variable motor.
5. A hydro-mechanical compound drive as defined in claim 1 wherein: the hydraulic motor (2) is a constant pressure motor or a constant displacement motor or a constant power motor or a compound form of the motors.
6. A hydro-mechanical compound drive as defined in claim 1 wherein: the motor (1) is an alternating current asynchronous motor or a switched reluctance motor or a servo motor.
7. A hydro-mechanical compound drive as defined in claim 1 wherein: the hydraulic circuit (15) comprises a closed hydraulic pump (16), an I overflow valve (17), an II overflow valve (18), an III overflow valve (19), an I check valve (20), an II check valve (21), a filter (22), an oil supplementing pump (23) and an oil tank (24);
the two oil ports of the closed hydraulic pump (16) are respectively connected with the two oil ports of the hydraulic motor through a pipeline A and a pipeline B; two ends of a second overflow valve (18) and a third overflow valve (19) are respectively connected with a pipeline A and a pipeline B, an oil supplementing pump (23) is connected with a first one-way valve (20) and a second one-way valve (21) through a filter (22) and a first overflow valve (17), the first one-way valve (20) and the second one-way valve (21) are respectively connected with the pipeline A and the pipeline B, the other oil port of the oil supplementing pump (23) is connected with an oil tank (24), and the other valve port of the first overflow valve (17) is connected with the oil tank (24).
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