Stepless speed change system

Abstract

The invention discloses a stepless speed change system which comprises a first hydraulic circuit and a second hydraulic circuit, a two-way variable pump and a two-way variable motor are arranged on the first hydraulic circuit, and a pump driving module is arranged on the second hydraulic circuit. The second hydraulic loop is further provided with a motor driving module used for adjusting a pump swing disc on the two-way variable displacement pump so as to adjust the output direction and the output displacement of the two-way variable displacement pump, and the second hydraulic loop is further provided with a motor driving module used for adjusting a motor swing disc on the two-way variable displacement motor so as to adjust the rotating torque and the output rotating speed of the two-way variable displacement motor. Based on the change of the hydraulic oil output direction and displacement of the two-way variable displacement pump, the two-way variable displacement motors can adjust the output torque and the rotating speed in a wide range so as to adapt to different working conditions, the two-way variable displacement motors are arranged on the first hydraulic loop in parallel, the working pressure of each two-way variable displacement motor is balanced, and the working efficiency is improved. The overload condition of a single two-way variable displacement motor is avoided, and the motor is more suitable for occasions with large load fluctuation.

Description

Technical Field

[0001] The present invention relates to the field of speed changers, and in particular to a continuously variable speed change system. Background Art

[0002] The principle of a hydrostatic continuously variable transmission is to drive the speed of a hydraulic motor to change based on the change in the displacement of a hydraulic pump to achieve continuously variable speed. Existing hydrostatic continuously variable transmissions all use fixed displacement motors and can only operate under fixed displacement and fixed working conditions. As a result, they can only be used in situations where the load is relatively constant or changes little. In situations where the load changes greatly, it will lead to efficiency loss and the hydraulic energy cannot be used efficiently. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a continuously variable transmission system, comprising:

[0004] The actuator assembly includes a first hydraulic circuit, wherein a bidirectional variable pump is provided in the first hydraulic circuit for outputting hydraulic pressure, wherein the bidirectional variable pump includes a pump swing plate for controlling the output direction and output displacement of the hydraulic pressure output by the bidirectional variable pump; at least two sets of bidirectional variable motors are also provided in parallel in the first hydraulic circuit for outputting rotation speed and torque under the action of the hydraulic pressure of the bidirectional variable pump, wherein each of the bidirectional variable motors is provided with a motor swing plate for controlling the rotation torque of the bidirectional variable motor;

[0005] A drive assembly, comprising a second hydraulic circuit, a pump drive cylinder module being arranged on the second hydraulic circuit, the pump drive cylinder module comprising a first pump drive cylinder and a second pump drive cylinder, the output ends of the first pump drive cylinder and the second pump drive cylinder being respectively connected to both sides of the deflection axis of the pump swing plate, and the swing of the pump swing plate is controlled based on the change of the inlet / outlet oil state of the first pump drive cylinder and the second pump drive cylinder;

[0006] The second hydraulic circuit is also provided with motor-driven cylinder modules corresponding to the number of the bidirectional variable motors, each motor-driven cylinder module includes a first motor-driven cylinder and a second motor-driven cylinder, and the output ends of each group of the first motor-driven cylinder and the second motor-driven cylinder are respectively connected to the two sides of the deflection axis of the motor swing plate, and the swing of the motor swing plate is controlled based on the change of the inlet / outlet oil state of the first motor-driven cylinder and the second motor-driven cylinder.

[0007] Preferably, the pump drive module further includes a pump reversing valve; one end of the pump reversing valve is connected to the oil inlet and the oil outlet of the second hydraulic circuit, and the other end of the pump reversing valve is connected to the first pump drive cylinder and the second pump drive cylinder;

[0008] The motor drive module also includes a motor reversing valve, each of which is configured to have one end connected to the oil inlet and the oil outlet of the second hydraulic circuit, and the other end connected to the first motor drive cylinder and the second motor drive cylinder.

[0009] Preferably, the driving assembly includes a main driving component, on which a pump driving component and a motor driving component are movably connected, and the pump driving component and the motor driving component are respectively connected to the pump reversing valve and the motor reversing valve. Based on the drive of the main driving component, the pump driving component and the motor driving component can change the working position of the pump reversing valve and the motor reversing valve.

[0010] Preferably, the main driving member includes a rotating shaft, on which a pump driving cam and a motor driving cam are arranged at intervals, and the pump driving cam and the motor driving cam are respectively connected to the pump driving member and the motor driving member, and based on the rotation of the rotating shaft, the pump driving cam and the motor driving cam drive the movement of the pump driving member and the motor driving member.

[0011] Preferably, the pump driving cam and the motor driving cam are both cylindrical cams with curved grooves, and the pump driving member and the motor driving member are slidably connected in the curved grooves of the pump driving cam and the motor driving cam, respectively.

[0012] Preferably, the pump reversing valve and the motor reversing valve are both three-position four-way reversing valves.

[0013] Preferably, the bidirectional variable pump and the bidirectional variable motor both adopt a bidirectional variable pump-motor, a pump-motor swing plate is provided on the bidirectional variable pump-motor, and the bidirectional variable pump-motor has a pump working condition and a motor working condition;

[0014] Among them, at least one group of the bidirectional variable pump-motor is in the pump working condition, used to output hydraulic pressure to other bidirectional variable pump-motor, and at least one group of the bidirectional variable pump-motor is in the motor working condition, used to output speed and torque under the action of hydraulic pressure.

[0015] Preferably, the actuator has a stationary state, in which the output displacement of the bidirectional variable pump is zero and the rotation torque of the bidirectional variable pump is a maximum value;

[0016] The driving assembly includes a first driving mode and a second driving mode. In the first driving mode, the output direction is adjusted to a first direction, the output displacement gradually increases, and the rotation torque gradually decreases;

[0017] In the second driving mode, the output direction is adjusted to a second direction, the output displacement gradually increases, and the rotational torque gradually decreases.

[0018] Preferably, the oil inlet of the first hydraulic circuit is connected to a first oil inlet circuit and a second oil inlet circuit, the first oil inlet circuit and the second oil inlet circuit are respectively connected to two ends of the bidirectional variable pump, and a one-way valve leading from the oil inlet to the bidirectional variable pump is provided on the first oil inlet circuit and the second oil inlet circuit.

[0019] Preferably, it further includes an input component, which can receive an external operation signal and control the action of the drive component based on the external operation signal.

[0020] By applying the technical solution provided by the present invention, a first hydraulic circuit is set up, a bidirectional variable pump and a bidirectional variable motor are set up on the first hydraulic circuit, the bidirectional variable pump is used to output hydraulic pressure to the bidirectional hydraulic motor, and the bidirectional hydraulic motor is used to output a rotation speed under the action of hydraulic pressure, and a second hydraulic circuit is set up, a first pump drive cylinder and a second pump drive cylinder are set up on the second hydraulic circuit, which are used to adjust the pump swing plate on the bidirectional variable pump, and then adjust the output direction and output displacement of the bidirectional variable pump, and the second hydraulic circuit is also provided with a first motor drive cylinder and a second motor drive cylinder, which are used to adjust the motor swing plate on the bidirectional variable motor, and then adjust the rotational torque and output speed of the bidirectional variable motor, so that the bidirectional variable motor can adjust the output torque and speed within a wider range to adapt to different working conditions, and the bidirectional variable motors are arranged in parallel on the first hydraulic circuit, and the working pressure of each bidirectional variable motor is balanced, thereby avoiding the overload of a single bidirectional variable motor, and is more suitable for occasions with large load fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an overall hydraulic principle diagram of a continuously variable transmission system provided by an embodiment of the present invention;

[0022] Figure 2 is a hydraulic principle diagram of a drive assembly of a continuously variable transmission system provided by an embodiment of the present invention;

[0023] Figure 3 It is a hydraulic principle diagram of an actuator component of a continuously variable transmission system provided by an embodiment of the present invention;

[0024] Among them, 1. actuator component; 11. first hydraulic circuit; 111. first oil inlet; 112. second oil inlet; 113. one-way valve; 114. high-pressure relief valve; 115. shuttle valve; 116. flushing valve; 117. high-pressure detector; 118. turbine clutch solenoid valve; 12. two-way variable pump; 121. pump swing plate; 13. two-way variable motor; 131. motor swing plate; 2. drive component; 21. second hydraulic circuit; 211. first pump drive cylinder; 212. second pump drive cylinder; 213. first motor drive cylinder; 214. second motor drive cylinder; 215. pump reversing valve; 216. motor reversing valve; 22. main drive member; 221. rotating shaft; 222. pump drive cam; 223. motor drive cam; 23. pump drive member; 24. motor drive member; 3. input component. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Figure 1 It is an overall hydraulic principle diagram of a continuously variable transmission system provided in one embodiment of the present invention.

[0027] like Figure 1 As shown, an embodiment of the present invention provides a continuously variable transmission system, including an actuator component 1 and a drive component 2, the actuator component 1 includes a first hydraulic circuit 11, a bidirectional variable pump 12 and at least two sets of bidirectional variable motors 13 are provided in the first hydraulic circuit 11, a pump swing plate 121 is provided in the bidirectional variable pump 12, and the hydraulic displacement and output direction of the bidirectional variable pump can be changed according to the swing angle of the pump swing plate 121, and the bidirectional variable motors 13 are all provided with motor swing plates 131, and the rotational torque of the bidirectional variable motor can be changed according to the swing angle of the motor swing plate 131, and the swing angle of the swing plate of each bidirectional variable motor 13 is the same;

[0028] By changing the output direction and hydraulic displacement of the bidirectional variable pump 12, the flow direction and flow rate of the hydraulic oil discharged from the bidirectional variable pump 12 to the bidirectional variable motor 13 in the first hydraulic circuit 11 are changed, which can change the hydraulic input of the bidirectional variable motor 13. Combined with the change in the rotational torque of the bidirectional variable motor 13, the bidirectional variable motor 13 is driven to output in various output modes.

[0029] The driving assembly 2 includes a second hydraulic circuit 21, on which a pump driving module and motor driving modules corresponding to the number of bidirectional variable motors 13 are arranged. The pump driving module includes a first pump driving cylinder 211 and a second pump driving cylinder 212, and the output ends of the first pump driving cylinder 211 and the second pump driving cylinder 212 are respectively connected to the two sides of the deflection axis of the pump swing plate 121, so as to control the swing of the pump swing plate 121; each group of motor driving modules includes a first motor driving cylinder 213 and a second motor driving cylinder 214, and the output ends of the first motor driving cylinder 213 and the second motor driving cylinder 214 are respectively connected to the two sides of the deflection axis of the motor swing plate 131, so as to control the swing of the motor swing plate 131;

[0030] Based on the above settings, the action of each driving cylinder in the driving assembly can adjust the output direction and output displacement of the bidirectional variable pump 12 by changing the swing of the pump swing plate 121, and can adjust the output torque and output speed of the bidirectional variable motor 13 by changing the swing of the motor swing plate 131. It can achieve various speed and torque requirements of the bidirectional variable motor 13 to adapt to different working conditions, and the bidirectional variable motor 13 is arranged in parallel on the first hydraulic circuit 11, and the working pressure of each bidirectional variable motor 13 is balanced, thereby avoiding overload of a single bidirectional variable motor 13, and is more suitable for occasions with large load fluctuations.

[0031] Furthermore, in one of the preferred embodiments, the initial swing angles of the motor swing disk 131 of each group of bidirectional variable motors 13 are the same, and each group of motor driving modules drives the motor swing disk 131 synchronously, so that during the speed change process, the swing angles of the motor swing disk 131 of each group of bidirectional variable motors 13 always remain the same, which can make the output torque of each group of bidirectional variable motors 13 equal, and thus make the output of each group of bidirectional variable motors 13 the same, which is more convenient for overall control.

[0032] Figure 2 It is a hydraulic principle diagram of a driving component of a continuously variable transmission system provided in one embodiment of the present invention.

[0033] like Figure 2As shown, in one preferred embodiment, a pump reversing valve 215 and a motor reversing valve 216 are provided on the second hydraulic circuit 21, one end of the pump reversing valve 215 is connected to the oil inlet and the oil outlet of the second hydraulic circuit 21, and the other end is connected to the first pump drive cylinder 211 and the second pump drive cylinder 212. By setting the pump reversing valve 215, the oil inlet or oil outlet state of the first pump drive cylinder 211 and the second pump drive cylinder 212 can be changed, thereby changing the swing angle of the pump swing plate 121; the number of motor reversing valves 216 corresponds to the number of bidirectional variable motors 13, and each motor reversing valve 216 is configured to have one end connected to the oil inlet and the oil outlet of the second hydraulic circuit 21, and the other end is connected to the first motor drive cylinder 213 and the second motor drive cylinder 214. By setting the motor reversing valve 216, the oil inlet or oil outlet state of the first motor drive cylinder 213 and the second motor drive cylinder 214 can be changed, thereby changing the swing angle of the motor swing plate 131.

[0034] In addition, other methods can also be used to change the oil inlet or oil outlet status of the first pump drive cylinder 211, the second pump drive cylinder 212, the first motor drive cylinder 213 and the second motor drive cylinder 214. For example, each drive cylinder is electrically controlled and connected to a control component. The control component can obtain input information (i.e., the current requirements for the output of the drive component). Based on the input information, the control component adjusts the oil inlet and outlet status of each drive cylinder or directly adjusts the output action of each drive cylinder to adjust the output of the bidirectional variable motor 13, etc. As long as the action of the drive cylinder can be controlled and the output of the motor can be changed, it will not be elaborated here.

[0035] like Figure 2 As shown, in one of the preferred embodiments, the installation method of each motor reversing valve 215 on the second hydraulic circuit 21 and the connection method with the first motor drive cylinder 213 and the second motor drive cylinder 214 are the same, and the initial swing angle of the swing plate of each bidirectional variable motor 13 is the same. Therefore, by synchronously driving each motor reversing valve 215, the inlet and outlet oil states of each group of the first motor drive cylinder 213 and the second motor drive cylinder 214 can be changed synchronously, and the action of each motor swing plate 131 can be synchronously driven, thereby enabling the output mode of each bidirectional variable motor 13 to be synchronously adjusted.

[0036] like Figure 2As shown, in one preferred embodiment, the drive assembly 2 includes a main drive member 22, and a pump drive member 23 and a motor drive member 24 are movably connected to the main drive member 22. The pump drive member 23 and the motor drive member 24 are respectively connected to the pump reversing valve 215 and the motor reversing valve 216. The main drive member 22 drives the pump drive member 23 and the motor drive member 24 to move, thereby changing the working position of the pump reversing valve 215 and the motor reversing valve 216, and changing the oil inlet and outlet states of each drive cylinder, thereby controlling the movement of the pump swing plate 121 and the motor swing plate 131.

[0037] Further, such as Figure 2 As shown, the main driving member 22 includes a rotating shaft 221, on which a pump driving cam 222 and a motor driving cam 223 are arranged at intervals. The pump driving cam 222 and the motor driving cam 223 are respectively connected to the pump driving member 23 and the motor driving member 24. Through the rotation of the rotating shaft 221, the pump driving member 23 and the motor driving member 24 are driven by the pump driving cam 222 and the motor driving cam 223 to operate, thereby changing the working positions of the pump reversing valve 215 and the motor reversing valve 216.

[0038] The pump driver 23 and the motor driver 24 are driven by the cooperation of the cam connecting rod. On the one hand, the pump driver 222 and the motor driver 223 are both arranged on the rotating shaft 221. When the rotating shaft 221 rotates, the two cams move synchronously, and then the pump driver 23 and the motor driver 24 move synchronously, which can change the working state of the two-way variable pump 12 and the working state of the two-way variable motor 13 at the same time, and is more convenient to control. On the other hand, the mechanical transmission method is used to control the actions of the pump driver 23 and the motor driver 24, which eliminates the complicated control structure and is more convenient for installation and use.

[0039] like Figure 2 As shown, in one of the preferred embodiments, the pump driving cam 222 and the motor driving cam 223 are both cylindrical cams, and a curved groove is provided on the cylindrical surface of the cylindrical cam. The groove body of the curved groove can be extended along a spiral on the cylindrical surface of the cylindrical cam, or can be other curved shapes extending along the axis on the cylindrical surface. In this case, the pump driving member 23 and the motor driving member 24 can be set as a connecting rod with one end slidingly connected in the curved groove. Based on the rotation of the rotating shaft 221, the cylindrical cam is rotated, and then the pump driving member 23 and the motor driving member 24 slide along the curved groove, and then the pump driving member 23 and the motor driving member 24 move along the axial direction of the rotating shaft 221, so as to realize the driving of the pump driving member 23 and the motor driving member 24, and then realize the driving of the pump reversing valve 215 and the motor reversing valve 216;

[0040] For example, Figure 2As shown, the axes of the pump driving cam 222 and the motor driving cam 223 are the same as the installation directions of the pump reversing valve 215 and the motor reversing valve 216. When the pump driving cam 222 and the motor driving cam 223 rotate, they can drive the pump driving member 23 and the motor driving member 24 to slide along the curved groove, and the sliding direction is parallel to the installation direction of the pump reversing valve 215 and the motor reversing valve 216, thereby making the pump driving member 23 and the motor driving member 24 drive the pump reversing valve 215 and the motor reversing valve 216 to move left and right to switch the working positions of the pump reversing valve 215 and the motor reversing valve 216.

[0041] In addition, other methods can also be used to drive the actions of the pump driver 23 and the motor driver 24. For example, solenoid valves can be used as the pump reversing valve 215 and the motor reversing valve 216. By driving the electromagnet, the working position of the reversing valve can be changed to achieve a change in the flow path.

[0042] like Figure 1 As shown, in one of the preferred embodiments, the pump reversing valve 215 and the motor reversing valve 216 both adopt three-position four-way reversing valves, one side of the three-position four-way reversing valve is connected to the oil inlet and oil outlet of the second hydraulic circuit 21, and the other side is connected to two driving cylinders. By controlling the three-position four-way reversing valve to be in different working positions, the oil inlet and oil outlet states of the driving cylinders to which it is connected can be changed. The action of the three-position four-way reversing valve and the switching of the oil circuit are simple, quick, and more convenient to use.

[0043] Furthermore, the pump reversing valve 215 and the motor reversing valve 216 can be set as three-position four-way reversing valves of the same model. In this case, the pump driving cam 222 can be set based on the rotation of the rotating shaft 221 to drive the pump driving component 23 to move a first distance in a certain direction, and the motor driving cam 223 can drive the motor driving component 24 to move a first distance in the same direction or in the opposite direction, so that the pump reversing valve 215 and the motor reversing valve 216 perform the same amplitude movement in the same direction or in the opposite direction, which is more convenient for switching and controlling the working positions of the pump reversing valve 215 and the motor reversing valve 216.

[0044] In one of the preferred embodiments, the actuator 1 has a stationary state. In the stationary state, the output displacement of the bidirectional variable pump 12 is zero, and the rotational torque of the bidirectional variable motor 13 is at a maximum value. The drive component 2 includes a first drive mode and a second drive mode. In the first drive mode, the output direction of the bidirectional variable pump 12 is adjusted to a first direction, the output displacement gradually increases, and the rotational torque of the bidirectional variable motor 13 gradually decreases; in the second drive mode, the output direction is adjusted to a second direction, the output displacement gradually increases, and the rotational torque gradually decreases.

[0045] For example, in one of the use states, the initial swing angle of the pump swing plate 121 is 0 degrees (the output displacement is also zero at this time), and in the first driving mode, the rotating shaft 221 rotates, and the pump driving cam 222 drives the pump driving member 24 and then drives the pump reversing valve 215 to move to the left, so that the pump reversing valve 215 works in the right position. At this time, the second pump driving cylinder 212 on the right side is filled with oil, and the first pump driving cylinder 211 on the left side is discharged with oil, so that the pump swing plate 121 rotates and gradually increases the swing angle, and the bidirectional variable pump output 12 outputs displacement along the first direction and the displacement gradually increases. Large, and the initial swing angle of the motor swing plate 131 can be set to a value other than 0, such as 45 degrees (at this time the motor's rotational torque is at its maximum value), the motor drive cam 223 drives the motor drive member 25 and then drives the motor reversing valve 216 to move to the right, so that the motor reversing valve 216 works in the left position, at this time, the first motor drive cylinder 213 on the left side is filled with oil, and the second motor drive cylinder 214 on the right side is discharged with oil, so that the motor swing plate 131 rotates and the swing angle is gradually reduced, the rotational torque of the bidirectional variable motor 13 is gradually reduced, and the speed is gradually increased.

[0046] It should be noted that the above two control modes and embodiments are only preferred embodiments proposed for the convenience of understanding the technical solution of the present invention. Based on the arrangement of the actuator 1 and the drive assembly 2, more control modes can also be generated, so that the pump swing plate 121 and the motor swing plate 131 can swing flexibly according to actual needs, and finally realize the combined output mode of the speed and torque of multiple motors, realize stepless speed change, and meet the requirements of various working conditions.

[0047] In one of the preferred embodiments, the bidirectional variable pump 12 and the bidirectional variable motor 13 can adopt a bidirectional variable pump-motor, which is a component that can realize the functions of a pump and a motor, that is, when the bidirectional variable pump-motor is in the pump working condition, it can be used as a bidirectional variable pump, and when the bidirectional variable pump-motor is in the motor working condition, it can be used as a bidirectional variable motor. It should be noted that when a bidirectional variable pump-motor is adopted, it should be ensured that at least one group of bidirectional variable pump-motor is in the pump working condition, which is used to output liquid pressure to other bidirectional variable pump-motor, and at least one group of bidirectional variable pump-motor is in the motor working condition, which is used to output speed and torque under the action of liquid pressure.

[0048] like Figure 1As shown, in one of the preferred embodiments, an input component 3 is also provided, which can receive an external operation signal, and control the action of the drive component based on the external operation signal, thereby changing the output of the output component 1. When the rotation shaft 221 and the cam are used as the driving mechanism of the pump reversing valve 215 and the motor reversing valve 216, the input component 3 can use a servo motor, and the output end of the servo motor is connected to the rotation shaft 221, which can drive the rotation of the rotation shaft 221, thereby driving the action of the pump reversing valve 215 and the motor reversing valve 216, and changing the output of the output component 1. The specific setting method of the input component 3 should be adaptively adjusted according to the setting method of the drive component 2.

[0049] Figure 3 It is a hydraulic principle diagram of an actuator component of a continuously variable transmission system provided in one embodiment of the present invention.

[0050] like Figure 3 As shown, in one preferred embodiment, the oil inlet of the first hydraulic circuit 11 is connected to the first oil inlet circuit 111 and the second oil inlet circuit 112, and the first oil inlet circuit 111 and the second oil inlet circuit 112 are respectively connected to the two ends of the two-way variable pump 12, and are used to supply oil to the two-way variable pump 12 in both directions. A one-way valve 113 is provided on the first oil inlet circuit 111 and the second oil inlet circuit 112, and the one-way valve 113 can allow oil to flow from the oil inlet to the two-way variable pump 12, thereby ensuring the smoothness of the two-way oil inlet and oil discharge of the two-way variable pump 12. In some other embodiments, an electrically controlled stop valve or the like can be provided on the first oil inlet circuit 111 and the second oil inlet circuit 112 to ensure the smoothness of the two-way oil inlet and oil discharge of the two-way variable pump 12.

[0051] Further, such as Figure 3 As shown, in the first hydraulic circuit 11, high-pressure relief valves 114 are provided at both ends of the bidirectional variable pump 12. The high-pressure relief valve 114 is provided on a branch of the oil circuit from the bidirectional variable pump 12 to the bidirectional variable motor 13. Under normal use, the high-pressure relief valve 114 will not affect the oil from the bidirectional variable pump 12 to the bidirectional variable motor 13. When the pressure in the oil circuit exceeds the threshold of the high-pressure relief valve 114, the high-pressure relief valve 114 opens, and the high-pressure oil is released through the branch by the high-pressure relief valve 114, which can ensure the safe use of the first hydraulic circuit 11.

[0052] One end of the two high-pressure relief valves 114 is connected to the two-way variable pump 12, and the other end is connected to the shuttle valve 115. The shuttle valve 115 can lead the high-pressure oil discharged from the two high-pressure relief valves 114 to the high-pressure detector 117 and the turbine clutch solenoid valve 118, which can be used to adjust the pressure state in the first hydraulic circuit 11. In order to establish system pressure, the turbine clutch solenoid valve 118 can be used in conjunction with the input component 3. The input parameters of the input component 3 form a certain proportion of control current to control the action of the turbine clutch solenoid valve 118, which can slowly build up high pressure, avoid excessive starting impact, and achieve smooth start-up of the entire system.

[0053] In addition, a flushing valve 116 can be set on another branch of the oil circuit leading from the bidirectional variable pump 12 to the bidirectional variable motor 13. One side of the flushing valve 116 is connected to the two ends of the bidirectional variable pump 12. When the pump and motor continue to work, the oil temperature of the high-pressure circuit will become higher and higher. In order to avoid excessive oil temperature, the flushing valve 116 can be used to act on the cooler for cooling.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention and should be included in the scope of the claims of the present invention.

Claims

1. A continuously variable transmission system, characterized in that: include: The actuator assembly includes a first hydraulic circuit, wherein a bidirectional variable pump is provided in the first hydraulic circuit for outputting hydraulic pressure, wherein the bidirectional variable pump includes a pump swing plate for controlling the output direction and output displacement of the hydraulic pressure output by the bidirectional variable pump; at least two sets of bidirectional variable motors are also provided in parallel in the first hydraulic circuit for outputting rotation speed and torque under the action of the hydraulic pressure of the bidirectional variable pump, wherein each of the bidirectional variable motors is provided with a motor swing plate for controlling the rotation torque of the bidirectional variable motor; A drive assembly, comprising a second hydraulic circuit, a pump drive cylinder module being arranged on the second hydraulic circuit, the pump drive cylinder module comprising a first pump drive cylinder and a second pump drive cylinder, the output ends of the first pump drive cylinder and the second pump drive cylinder being respectively connected to both sides of the deflection axis of the pump swing plate, and the swing of the pump swing plate is controlled based on the change of the inlet / outlet oil state of the first pump drive cylinder and the second pump drive cylinder; The second hydraulic circuit is also provided with motor-driven cylinder modules corresponding to the number of the bidirectional variable motors, each motor-driven cylinder module includes a first motor-driven cylinder and a second motor-driven cylinder, and the output ends of each group of the first motor-driven cylinder and the second motor-driven cylinder are respectively connected to the two sides of the deflection axis of the motor swing plate, and the swing of the motor swing plate is controlled based on the change of the inlet / outlet oil state of the first motor-driven cylinder and the second motor-driven cylinder.

2. The continuously variable transmission system according to claim 1, characterized in that: The pump drive module further includes a pump reversing valve; one end of the pump reversing valve is connected to the oil inlet and the oil outlet of the second hydraulic circuit, and the other end of the pump reversing valve is connected to the first pump drive cylinder and the second pump drive cylinder; The motor drive module also includes a motor reversing valve, each of which is configured to have one end connected to the oil inlet and the oil outlet of the second hydraulic circuit, and the other end connected to the first motor drive cylinder and the second motor drive cylinder.

3. The continuously variable transmission system according to claim 2, characterized in that: The driving assembly includes a main driving component, to which a pump driving component and a motor driving component are movably connected. The pump driving component and the motor driving component are respectively connected to the pump reversing valve and the motor reversing valve. Based on the drive of the main driving component, the pump driving component and the motor driving component can change the working position of the pump reversing valve and the motor reversing valve.

4. The continuously variable transmission system according to claim 3, characterized in that: The main driving member includes a rotating shaft, on which a pump driving cam and a motor driving cam are arranged at intervals. The pump driving cam and the motor driving cam are respectively connected to the pump driving member and the motor driving member. Based on the rotation of the rotating shaft, the pump driving cam and the motor driving cam drive the pump driving member and the motor driving member to move.

5. The continuously variable transmission system according to claim 4, characterized in that: The pump driving cam and the motor driving cam are both cylindrical cams with curved grooves, and the pump driving member and the motor driving member are respectively slidably connected in the curved grooves of the pump driving cam and the motor driving cam.

6. The continuously variable transmission system according to claim 2, characterized in that: The pump reversing valve and the motor reversing valve both adopt three-position four-way reversing valves.

7. The continuously variable transmission system according to claim 1, characterized in that: The bidirectional variable pump and the bidirectional variable motor both use a bidirectional variable pump-motor, a pump-motor swing plate is provided on the bidirectional variable pump-motor, and the bidirectional variable pump-motor has a pump working condition and a motor working condition; Among them, at least one group of the bidirectional variable pump-motor is in the pump working condition, used to output hydraulic pressure to other bidirectional variable pump-motor, and at least one group of the bidirectional variable pump-motor is in the motor working condition, used to output speed and torque under the action of hydraulic pressure.

8. The continuously variable transmission system according to claim 1, characterized in that: The actuator has a stationary state, in which the output displacement of the bidirectional variable pump is zero and the rotation torque of the bidirectional variable motor is a maximum value; Based on the stationary state, the driving assembly includes a first driving mode and a second driving mode, in which the output direction is adjusted to a first direction, the output displacement gradually increases, and the rotational torque gradually decreases; In the second driving mode, the output direction is adjusted to a second direction, the output displacement gradually increases, and the rotational torque gradually decreases.

9. The continuously variable transmission system according to claim 1, characterized in that: The oil inlet of the first hydraulic circuit is connected to a first oil inlet circuit and a second oil inlet circuit, the first oil inlet circuit and the second oil inlet circuit are respectively connected to two ends of the bidirectional variable pump, and a one-way valve leading from the oil inlet to the bidirectional variable pump is arranged on the first oil inlet circuit and the second oil inlet circuit.

10. The continuously variable transmission system according to claim 1, characterized in that: An input component is also included, which can receive an external operation signal and control the action of the driving component based on the external operation signal.

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