Retarder unloading system controlled by electric pump and electromagnetic valve

Abstract

The invention provides a retarder unloading system controlled by an electric pump and an electromagnetic valve, and relates to the technical field of vehicle retarders, the retarder unloading system comprises a retarding mechanical device, an unloading valve and the electric pump; the retarding mechanical device is provided with a high-pressure cavity and a low-pressure cavity; the unloading valve is provided with a piston loading cavity, the piston loading cavity is provided with a high-pressure port, a low-pressure port and a control port, the high-pressure port is connected with the high-pressure cavity through a high-pressure branch, and the low-pressure port is connected with the low-pressure cavity; the electric pump is connected with the control port through a first pipeline, the electric pump can depressurize the piston loading cavity, in the depressurizing state, the unloading valve is in an open state, and the high-pressure port communicates with the low-pressure port. The technical problem that in the prior art, the unloading reaction speed of a retarder is relatively low is solved, the technical effects of being rapid in unloading reaction and accurate in control are achieved, and the positive displacement pump principle can be used for the retarder.

Description

technical field [0001] The invention relates to the technical field of vehicle retarders, in particular to a retarder unloading system controlled by an electric pump and a solenoid valve. Background technique [0002] Due to the many intersections of urban roads, dense bus stops, and large passenger flow, buses often have to brake frequently; mountain roads are steep and have many sharp bends, and medium and large trucks and buses that have been driving on mountain roads for a long time also often need to brake. [0003] When the brake works frequently for a long time, it will cause rapid wear of the brake shoe, shorten the service life of the brake friction plate, and cause the loss of braking force or the sharp decline in braking performance due to the thermal decline of the brake, which has become one of the main causes of traffic accidents. one. Therefore, it is necessary to be equipped with an auxiliary braking system. [0004] As an auxiliary braking part of the vehi...

AI Technical Summary

Problems solved by technology

Among them, the eddy current retarder has the disadvantages of large size, heavy body and high power consumption; the hydraulic retarder has at least the disadvantages of large volume, relatively slow response speed, insufficient low-speed braking force, and large no-load loss. All hydraulic retarders adopt the principle of stator-rotor mixed-flow pump, and this principle can make the displacement pump unloaded and unloaded, resulting in very small no-load resistance, so the principle of displacement pump can be applied to the retarder

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