Pump type magnetorheological fluid retarder

Abstract

The invention discloses a pump type magnetorheological fluid retarder. The retarder is characterized in that a retarder shaft is in anti-torque driving connection with a pump, a steel plate is installed in the retarder body and divides the retarder body into a left high-low pressure area channel and a right working cavity, a magnetizable material silicon steel plate and a working magnetic coil aremounted on the side of the working cavity, the pump is arranged in the right working cavity separated by the retarder body and the steel plate, the working cavity and the high-low pressure area channel are filled with working medium magnetorheological fluid, and a magnetorheological fluid valve is arranged in a left channel of a steel plate hole of the steel plate high-pressure area. In the working temperature range, viscosity of the magnetorheological fluid is slightly influenced by the temperature under the action of a magnetic field, the viscosity is proportional to the magnetic field intensity, controllability is excellent, the maximum braking force controllable, the maximum braking force can be far greater than that of a common hydraulic retarder, the retarder is stable in braking force, can generate the same braking force at a low rotating speed, can generate the required retarding braking force at any vehicle speed, is not only used for long slopes under mountain roads, but further can be widely used for meeting the requirement of frequent speed reduction of urban vehicles, main braking can be replaced to implement braking, and the use frequency of a main brake can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of vehicle retarders, and relates to a pump-type magneto-rheological fluid retarder; it is especially suitable for various vehicles such as cars, trucks, bus engineering vehicles and the like. 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, short service life of the brake friction plate, and the loss of braking force or a sharp drop in braking performance due to the thermal degradation of the brake, which has also become the main cause of traffic accidents. Therefore, it is necessary to be equipped with an auxiliary braking system....

AI Technical Summary

Problems solved by technology

[0008] The invention discloses a pump-type magneto-rheological fluid retarder, which solves the problem of the complex structure of the stator-rotor hydraulic retarder in the prior art; the limited braking force produced by the magnetorheological fluid brake and retarder in the prior art , the torque is limited by the size and other issues

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