Dual-motor drive assembly hydraulic system

Abstract

The utility model discloses a hydraulic system of a double-motor drive assembly. The hydraulic system comprises an oil supply unit, a cooling and filtering unit and a proportional shunting unit, the proportional shunting unit comprises a proportional shunting slide valve, a first pressure control valve and a second pressure control valve; an input port of the oil supply unit is connected with the oil pan, an output port of the oil supply unit is connected with an input port of the cooling filter unit, and an output port of the cooling filter unit is connected with an input port of the proportional shunt slide valve; output pressure of an output port of the first pressure control valve acts on one side of the proportional shunt slide valve, output pressure of an output port of the second pressure control valve acts on the other side of the proportional shunt slide valve, a first output port of the proportional shunt slide valve is connected with the first motor, and a second output port of the proportional shunt slide valve is connected with the second motor. According to the utility model, the hydraulic oil quantity of the double motors can be proportionally controlled according to requirements, so that the waste of flow is reduced, the efficiency of the whole hydraulic system is improved, and the power consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pressure, in particular to a dual-motor drive assembly hydraulic system. Background Art

[0002] The application of dual-motor drive assemblies in the drive system layout of pure electric vehicles is becoming more and more extensive. The most obvious advantage of dual-motor drive assemblies is that each motor independently controls a single wheel, achieving complete decoupling of the size and direction of the driving force of different wheels. At the same time, the mechanical differential can be eliminated and electronic differential can be achieved by different motor speeds.

[0003] However, at present, the hydraulic oil flow required by different motors in the existing dual-motor drive assembly hydraulic system cannot be proportionally adjusted. When the hydraulic oil flow required by one motor increases, the hydraulic oil flow required by a single motor can only be met by increasing the oil pump speed, resulting in low working efficiency of the hydraulic system.

[0004] Therefore, in order to solve the problem that the hydraulic oil flow cannot be proportionally adjusted, a new dual-motor drive assembly hydraulic system is needed, which can proportionally control the hydraulic oil volume of the dual motors according to demand, reduce flow waste, improve the efficiency of the entire hydraulic system, and reduce power consumption. Utility Model Content

[0005] In view of this, the purpose of the utility model is to overcome the defects in the prior art and provide a dual-motor drive assembly hydraulic system, which can proportionally control the hydraulic oil volume of the dual motors according to demand, reduce flow waste, improve the efficiency of the entire hydraulic system, and reduce power consumption.

[0006] The dual-motor drive assembly hydraulic system of the utility model comprises an oil supply unit for supplying hydraulic oil, a cooling filter unit for cooling the hydraulic oil, and a proportional flow splitter unit for proportionally adjusting the hydraulic oil;

[0007] The proportional flow splitter unit comprises a proportional flow splitter slide valve, a first pressure control valve and a second pressure control valve; the input port of the oil supply unit is connected to the oil pan, the output port of the oil supply unit is connected to the input port of the cooling filter unit, and the output port of the cooling filter unit is connected to the input port of the proportional flow splitter slide valve;

[0008] The output pressure of the output port of the first pressure control valve acts on one side of the proportional diverter slide valve, and the output pressure of the output port of the second pressure control valve acts on the other side of the proportional diverter slide valve. The first output port of the proportional diverter slide valve is connected to the first motor, and the second output port of the proportional diverter slide valve is connected to the second motor.

[0009] Further, the oil supply unit includes a first oil supply circuit and a second oil supply circuit;

[0010] The first oil supply circuit includes a first filter, a mechanical pump and a first one-way valve; the input port of the first filter is connected to the oil pan, the output port of the first filter is connected to the input port of the mechanical pump, the output port of the mechanical pump is connected to the input port of the first one-way valve, and the output port of the first one-way valve is connected to the input port of the cooling filter unit;

[0011] The second oil supply circuit includes a second filter, an electronic oil pump and a second one-way valve; the input port of the second filter is connected to the oil pan, the output port of the second filter is connected to the input port of the electronic oil pump, the output port of the electronic oil pump is connected to the input port of the second one-way valve, and the output port of the second one-way valve is connected to the input port of the cooling filter unit.

[0012] Furthermore, the oil supply unit also includes a third oil supply circuit; the third oil supply circuit includes a third filter, a second mechanical pump and a third one-way valve; the input port of the third filter is connected to the oil pan, the output port of the third filter is connected to the input port of the second mechanical pump, the output port of the second mechanical pump is connected to the input port of the third one-way valve, and the output port of the third one-way valve is connected to the input port of the cooling filter unit.

[0013] Furthermore, the first oil supply circuit also includes a fourth one-way valve connected in parallel with the mechanical pump; the input port of the fourth one-way valve is connected to the output port of the first filter, and the output port of the fourth one-way valve is connected to the input port of the first one-way valve.

[0014] Furthermore, the third oil supply circuit also includes a fifth one-way valve connected in parallel with the second mechanical pump; the input port of the fifth one-way valve is connected to the output port of the third filter, and the output port of the fifth one-way valve is connected to the input port of the third one-way valve.

[0015] Furthermore, the cooling filter unit includes an oil cooler and a fourth filter; the input port of the oil cooler is connected to the output port of the first one-way valve and the output port of the second one-way valve respectively; the output port of the oil cooler is connected to the input port of the fourth filter, and the output port of the fourth filter is connected to the input port of the proportional diverter slide valve.

[0016] Furthermore, the cooling filter unit also includes a sixth one-way valve connected in parallel with the fourth filter; the input port of the sixth one-way valve is connected to the output port of the oil cooler, and the output port of the sixth one-way valve is connected to the input port of the proportional diversion slide valve.

[0017] Further, the fluid input port of the first pressure control valve is connected to the output port of the cooling filter unit, and the output port of the first pressure control valve outputs hydraulic pressure.

[0018] Furthermore, the fluid input port of the second pressure control valve is connected to the output port of the cooling filter unit, and the output port of the second pressure control valve outputs hydraulic pressure.

[0019] The beneficial effects of the utility model are as follows: the utility model discloses a dual-motor drive assembly hydraulic system, in which a control valve is arranged on each side of the proportional diversion slide valve, and the pressure output by the control valve is used to act on the slide valve. By controlling the different output pressures of the control valves on both sides, the slide valve is placed in different positions, and then the two output ports of the slide valve have hydraulic oil flow rates of different proportions, so that the hydraulic oil volume of the dual motors can be proportionally controlled according to demand, reducing the waste of flow, improving the efficiency of the entire hydraulic system, and reducing power consumption. In addition, by arranging the mechanical pump oil supply and the electronic oil pump oil supply, a double insurance is formed, which improves the reliability of the oil supply. Even if the electronic oil pump fails, the mechanical pump can still provide part of the hydraulic oil to meet the demand of the vehicle's normal driving conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Among them, 1-first filter, 2-mechanical pump, 3-first one-way valve, 4-second filter, 5-electronic oil pump, 6-second one-way valve, 7-fourth one-way valve, 8-oil cooler, 9-fourth filter, 10-sixth one-way valve, 11-proportional diverter slide valve, 12-first pressure control valve, 13-second pressure control valve, 14-first motor, 15-second motor. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings of the specification, as shown in the figure:

[0024] The dual-motor drive assembly hydraulic system of the utility model comprises an oil supply unit for supplying hydraulic oil, a cooling filter unit for cooling the hydraulic oil, and a proportional flow splitter unit for proportionally adjusting the hydraulic oil;

[0025] The proportional flow splitter unit comprises a proportional flow splitter slide valve 11, a first pressure control valve 12 and a second pressure control valve 13; the input port of the oil supply unit is connected to the oil pan, the output port of the oil supply unit is connected to the input port of the cooling filter unit, and the output port of the cooling filter unit is connected to the input port of the proportional flow splitter slide valve 11;

[0026] The output pressure of the output port of the first pressure control valve 12 acts on one side of the proportional diverter valve 11, and the output pressure of the output port of the second pressure control valve 13 acts on the other side of the proportional diverter valve 11. The first output port of the proportional diverter valve 11 is connected to the first motor 14, and the second output port of the proportional diverter valve 11 is connected to the second motor 15.

[0027] The utility model realizes acting on the slide valve by arranging a control valve on each side of the proportional split slide valve 11, and applying the pressure output by the control valve to the spring chamber of the proportional split slide valve 11. By controlling the different output pressures of the control valves on both sides, the slide valve is placed in different positions, so that the two output ports of the slide valve have hydraulic oil flow rates of different proportions, thereby realizing proportional control of the hydraulic oil volume of the dual motors according to demand, reducing the waste of flow, improving the efficiency of the entire hydraulic system, and reducing power consumption.

[0028] In this embodiment, the oil supply unit includes a first oil supply circuit and a second oil supply circuit;

[0029] The first oil supply circuit includes a first filter 1, a mechanical pump 2 and a first one-way valve 3; the input port of the first filter 1 is connected to the oil pan, the output port of the first filter 1 is connected to the input port of the mechanical pump 2, the output port of the mechanical pump 2 is connected to the input port of the first one-way valve 3, and the output port of the first one-way valve 3 is connected to the input port of the cooling filter unit;

[0030] The first oil supply circuit can be arranged in the reduction gearbox on either side of the dual-motor assembly. By connecting the mechanical pump to the drive shaft in the vehicle's reduction gearbox, the power of the vehicle can be used to drive the mechanical pump, thereby realizing the oil supply function of the hydraulic system; by setting the first oil supply circuit, the hydraulic oil demand of the dual-motor drive assembly under normal working conditions can be met.

[0031] The second oil supply circuit includes a second filter 4, an electronic oil pump 5 and a second one-way valve 6; the input port of the second filter 4 is connected to the oil pan, the output port of the second filter 4 is connected to the input port of the electronic oil pump 5, the output port of the electronic oil pump 5 is connected to the input port of the second one-way valve 6, and the output port of the second one-way valve 6 is connected to the input port of the cooling filter unit.

[0032] By setting up a second oil supply circuit, auxiliary oil supply can be achieved. When the vehicle is traveling at a low speed, speeding or reversing, the electronic oil pump operates to provide hydraulic oil to meet the hydraulic oil demand of the dual-motor drive assembly. The vehicle's electronic control unit (ECU) will send a signal to the electronic oil pump to start or stop the operation of the pump.

[0033] The combination of the first oil supply circuit and the second oil supply circuit has high reliability. Even if the electronic oil pump fails, the mechanical pump can still provide part of the hydraulic oil to meet the demand of normal driving conditions of the vehicle.

[0034] In this embodiment, the oil supply unit also includes a third oil supply circuit; the third oil supply circuit includes a third filter, a second mechanical pump and a third one-way valve; the input port of the third filter is connected to the oil pan, the output port of the third filter is connected to the input port of the second mechanical pump, the output port of the second mechanical pump is connected to the input port of the third one-way valve, and the output port of the third one-way valve is connected to the input port of the cooling filter unit.

[0035] By setting up a third oil supply circuit, a dual mechanical pump oil supply solution is formed, thereby improving the range of operating conditions of the vehicle after the electronic oil pump fails, and meeting the hydraulic oil demand of the vehicle at higher speeds.

[0036] In this embodiment, the first oil supply circuit also includes a fourth one-way valve 7 connected in parallel with the mechanical pump; the input port of the fourth one-way valve 7 is connected to the output port of the first filter 1, and the output port of the fourth one-way valve 7 is connected to the input port of the first one-way valve 3.

[0037] In the case of reversing, the mechanical pump cannot provide sufficient oil pressure. By setting the fourth one-way valve 7, it is possible to prevent the oil from flowing back, ensure that sufficient oil pressure is maintained, and avoid failure of the hydraulic system due to air suction. In addition, in the case of blockage of the mechanical pump, it is possible to ensure that the hydraulic oil can pass through the fourth one-way valve 7 normally, thereby achieving normal circulation of the hydraulic oil.

[0038] In this embodiment, the third oil supply circuit also includes a fifth one-way valve connected in parallel with the second mechanical pump; the input port of the fifth one-way valve is connected to the output port of the third filter, and the output port of the fifth one-way valve is connected to the input port of the third one-way valve.

[0039] Similarly, in the reversing situation, the second mechanical pump cannot provide sufficient oil pressure. By setting the fifth one-way valve, it is possible to prevent the oil from flowing back, ensure that sufficient oil pressure is maintained, and avoid failure of the hydraulic system due to air suction. In addition, in the event of blockage in the second mechanical pump, it is possible to ensure that the hydraulic oil can pass through the fifth one-way valve normally, thereby achieving normal circulation of the hydraulic oil.

[0040] In this embodiment, the cooling filter unit includes an oil cooler 8 and a fourth filter 9; the input port of the oil cooler 8 is connected to the output port of the first one-way valve 3 and the output port of the second one-way valve 6 respectively; the output port of the oil cooler 8 is connected to the input port of the fourth filter 9, and the output port of the fourth filter 9 is connected to the input port of the proportional diverter slide valve 11.

[0041] The oil cooler 8 is provided to cool the high-temperature hydraulic oil, and the fourth filter 9 is provided to further filter the hydraulic oil to prevent the downstream valve from getting stuck.

[0042] In this embodiment, the cooling filter unit also includes a sixth one-way valve 10 connected in parallel with the fourth filter 9; the input port of the sixth one-way valve 10 is connected to the output port of the oil cooler 8, and the output port of the sixth one-way valve 10 is connected to the input port of the proportional diverter slide valve 11.

[0043] By providing the sixth one-way valve 10, it is ensured that when the fourth filter 9 is clogged, the hydraulic oil can pass through the sixth one-way valve 10 normally, thereby ensuring the normal circulation of the hydraulic oil.

[0044] In this embodiment, the fluid input port of the first pressure control valve 12 is connected to the output port of the cooling filter unit, and the output port of the first pressure control valve 12 outputs hydraulic pressure.

[0045] The first pressure control valve 12 may be an existing electromagnetic valve, such as a pilot electromagnetic valve. By using the electromagnetic valve as the first pressure control valve 12, power consumption is further reduced, accurate flow control is achieved, and high pressure adaptability is improved.

[0046] In this embodiment, the fluid input port of the second pressure control valve 13 is connected to the output port of the cooling filter unit, and the output port of the second pressure control valve 13 outputs hydraulic pressure.

[0047] The second pressure control valve 13 may also adopt an existing electromagnetic valve, such as a pilot electromagnetic valve. By using the electromagnetic valve as the second pressure control valve 13, the power consumption is further reduced, the flow rate is accurately controlled, and the adaptability to high pressure is improved.

[0048] It should be noted that flow valves may be respectively provided at the front ends of the dual motors as an alternative to the above-mentioned proportional flow splitting unit, and the flow rate of the hydraulic oil entering the motors may be controlled by controlling the valve opening of the flow valves.

[0049] The hydraulic oil quantity proportional control principle of the utility model is: the first pressure control valve and the second pressure control valve are both normally closed solenoid valves. When both solenoids are not energized, the proportional diverter slide valve is in the middle position, and the hydraulic oil is evenly distributed into the motors on both sides; when the hydraulic oil required by the left motor increases, the first pressure control valve is energized, and as the control current increases, the control pressure acting on the left spring chamber of the proportional diverter slide valve increases, the proportional diverter slide valve begins to move right, the throttle opening on the left side of the proportional diverter slide valve increases, and the hydraulic oil flow increases until the left throttle is fully opened and the right throttle is closed. At this time, the proportional diverter slide valve is in the rightmost position, and the hydraulic flow completely enters the left motor, and vice versa.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A dual-motor drive assembly hydraulic system, characterized in that: It includes an oil supply unit for supplying hydraulic oil, a cooling filter unit for cooling the hydraulic oil, and a proportional flow splitter unit for proportionally adjusting the hydraulic oil; The proportional flow splitter unit comprises a proportional flow splitter slide valve, a first pressure control valve and a second pressure control valve; the input port of the oil supply unit is connected to the oil pan, the output port of the oil supply unit is connected to the input port of the cooling filter unit, and the output port of the cooling filter unit is connected to the input port of the proportional flow splitter slide valve; The output pressure of the output port of the first pressure control valve acts on one side of the proportional diverter slide valve, and the output pressure of the output port of the second pressure control valve acts on the other side of the proportional diverter slide valve. The first output port of the proportional diverter slide valve is connected to the first motor, and the second output port of the proportional diverter slide valve is connected to the second motor.

2. The dual-motor drive assembly hydraulic system according to claim 1, characterized in that: The oil supply unit includes a first oil supply passage and a second oil supply passage; The first oil supply circuit includes a first filter, a mechanical pump and a first one-way valve; the input port of the first filter is connected to the oil pan, the output port of the first filter is connected to the input port of the mechanical pump, the output port of the mechanical pump is connected to the input port of the first one-way valve, and the output port of the first one-way valve is connected to the input port of the cooling filter unit; The second oil supply circuit includes a second filter, an electronic oil pump and a second one-way valve; the input port of the second filter is connected to the oil pan, the output port of the second filter is connected to the input port of the electronic oil pump, the output port of the electronic oil pump is connected to the input port of the second one-way valve, and the output port of the second one-way valve is connected to the input port of the cooling filter unit.

3. The dual-motor drive assembly hydraulic system according to claim 2 is characterized in that: The oil supply unit also includes a third oil supply circuit; the third oil supply circuit includes a third filter, a second mechanical pump and a third one-way valve; the input port of the third filter is connected to the oil pan, the output port of the third filter is connected to the input port of the second mechanical pump, the output port of the second mechanical pump is connected to the input port of the third one-way valve, and the output port of the third one-way valve is connected to the input port of the cooling filter unit.

4. The dual-motor drive assembly hydraulic system according to claim 2, characterized in that: The first oil supply circuit also includes a fourth one-way valve connected in parallel with the mechanical pump; the input port of the fourth one-way valve is connected to the output port of the first filter, and the output port of the fourth one-way valve is connected to the input port of the first one-way valve.

5. The dual-motor drive assembly hydraulic system according to claim 3, characterized in that: The third oil supply circuit also includes a fifth one-way valve connected in parallel with the second mechanical pump; the input port of the fifth one-way valve is connected to the output port of the third filter, and the output port of the fifth one-way valve is connected to the input port of the third one-way valve.

6. The dual-motor drive assembly hydraulic system according to claim 2, characterized in that: The cooling filter unit includes an oil cooler and a fourth filter; the input port of the oil cooler is connected to the output port of the first one-way valve and the output port of the second one-way valve respectively; the output port of the oil cooler is connected to the input port of the fourth filter, and the output port of the fourth filter is connected to the input port of the proportional diverter slide valve.

7. The dual-motor drive assembly hydraulic system according to claim 6, characterized in that: The cooling filter unit also includes a sixth one-way valve connected in parallel with the fourth filter; the input port of the sixth one-way valve is connected to the output port of the oil cooler, and the output port of the sixth one-way valve is connected to the input port of the proportional diversion slide valve.

8. The dual-motor drive assembly hydraulic system according to claim 1, characterized in that: The fluid input port of the first pressure control valve is connected to the output port of the cooling filter unit, and the output port of the first pressure control valve outputs hydraulic pressure.

9. The dual-motor drive assembly hydraulic system according to claim 1, characterized in that: The fluid input port of the second pressure control valve is connected to the output port of the cooling filter unit, and the output port of the second pressure control valve outputs hydraulic pressure.

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