Electric power-assisted brake device based on variable-stiffness spring

Abstract

The invention discloses an electric power-assisted brake device based on a variable-stiffness spring. The electric power-assisted brake device comprises a power-assisted cylinder, a foot bar assembly, a foot bar reset spring, an electric actuator and a brake pump assembly. A brake pump ejector rod for receiving braking force is arranged on the brake pump assembly, the electric actuator comprises an electric power assembly, a power-assisted sliding sleeve which is arranged inside the power-assisted cylinder in a sliding mode and provided with sliding driving force by the electric power assembly, the power-assisted sliding sleeve is in ejection fit with the brake pump ejector rod, the pedal reset spring is arranged in an axial through hole and is in elastic reset linkage with the head end of the foot bar assembly, and the head end of the foot bar assembly sequentially penetrates through a positioning pin through hole and the outer end of the axial through hole inside the power-assisted sliding sleeve and acts on the brake pump ejector rod in an ejection mode when sliding in the direction of the brake pump ejector rod axially. The electric power-assisted brake device has the advantages that the structural arrangement is reasonable, and foot bar brake force and electric power-assisted brake force are decoupled.

Description

technical field [0001] The invention relates to a brake component for auto parts, in particular to an electric power-assisted braking device based on variable stiffness springs, which can be used in fields such as electric vehicles, hybrid vehicles, unmanned vehicles, or intelligent driving vehicles. Background technique [0002] The braking system of traditional internal combustion engine vehicles mostly uses a vacuum booster device to assist the driver to generate sufficient braking force, and the vacuum source comes from the engine or a mechanical vacuum pump. For new energy vehicles (fuel cell vehicles and pure electric vehicles), there is no engine to provide a vacuum power source to provide braking boost, and the braking force generated by manpower alone cannot meet the needs of service braking. The electric power-assisted braking device can satisfy this demand very well. [0003] In recent years, major automobile and component manufacturers have launched similar elec...

AI Technical Summary

Problems solved by technology

However, due to the non-decoupling between the pedal simulator and the electric booster, the driver's pedaling force also needs to drive the motor of the electric booster to rotate at the same time. They are all high transmission output ratio settings, and it will be very difficult to drive the motor in reverse through the driver's pedal force. Therefore, when the electric booster fails, using the driver's pedal force to brake is not only The response speed is low, and the braking is difficult, which reduces the driving safety of the vehicle

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