Vehicle hydraulic vane pump motor and its switching control hydraulic system

Abstract

The invention relates to an automotive hydraulic vane pump motor and a switching control hydraulic system thereof. The pump motor comprises a rear pump cover, an oil-in distribution disc, a stator, a rotor, an oil-out distribution disc, a front pump cover, a shaft, a vane, an oil inlet and an oil outlet, wherein a static pressure oil chamber is formed in one side wall of a vane slot in the rotor and is communicated with an external hydraulic source through a signal oil passage; the static pressure oil chamber takes the shape of a groove and has openings which directly face the body of the vane when the vane extends to the maximal position and the minimal position; a vane root oil chamber, which is used for supplying hydraulic pressure to actuate the vane to extend out, is arranged at the root of the vane; an external switching control hydraulic system is used for supplying hydraulic oil to the vane root oil chamber; the switching control hydraulic system comprises an accumulator, a three-position electromagnetic directional valve and a reversing valve; one oil port in an output end of the reversing valve is communicated with the static pressure oil chamber, and the other oil port is connected with the vane root oil chamber; the oil port in an input end of the reversing valve is connected with signal oil, and a non-return valve is arranged on the accessed oil passage; oil ports in the output end of the three-position electromagnetic directional valve are respectively connected with the oil inlet and the oil outlet, and oil ports in the input end of the three-position electromagnetic directional valve are respectively connected with an oil tank and the accumulator.

Description

technical field [0001] The invention relates to a hydraulic pump, in particular to a vehicle hydraulic vane pump motor and a switching control hydraulic system thereof. Background technique [0002] For vehicle braking kinetic energy regeneration, the pump motor is generally used on the vehicle. When the kinetic energy of the vehicle is used for braking or deceleration, the pump motor is used as a pump to pump high-pressure oil into the accumulator to convert the kinetic energy into hydraulic energy. Stored; when the vehicle is starting or accelerating, the pump motor is used as a motor, and the high-pressure oil in the accumulator is used to drive the motor to rotate, driving the vehicle to start and accelerate, reducing the fuel consumption and exhaust emissions of the vehicle; and when the vehicle When driving at a constant speed, the pump motor does not need to work, because as long as there is oil circulation, there will be energy loss. If the pump motor is in the worki...

AI Technical Summary

Problems solved by technology

This invention can recover the braking energy of the vehicle when the vehicle is braking, but the structure is complicated and the control is difficult. One of the reasons for this situation is that the structure of the pump motor used is relatively complicated, and the difference between the two states of the pump and the motor is relatively complicated. It is not easy to control the switching between them, and the second is that when the vehicle is running normally, the transmission connection with the brake shaft of the vehicle must be disconnected.

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