Electric pump for automobile drive-by-wire braking system

Abstract

The invention relates to an electric pump for an automobile drive-by-wire braking system and belongs to automobile industries. The electric pump for the automobile drive-by-wire braking system is applied into the automobile drive-by-wire braking system. A guide sleeve is matched with a cylinder body inner hole in an interference mode, one axial end of the guide sleeve makes contact with a limiting step of the cylinder body inner hole, and the surface of a guide sleeve inner hole is a cylindrical surface; the two sides of the cylindrical surface are symmetrically provided with axial guide rail straight grooves, an axial rack straight groove is formed in the bottom of the cylindrical surface, and the diameter of a sealing cylindrical surface is larger than that of a guiding part; a secondary packing cup is sleeved with the sealing cylindrical surface of a piston, strip-shaped protruded guide rails are symmetrically arranged on the two axial sides of a cylindrical surface of the guiding part, and racks are arranged at the bottom of the cylindrical surface of the guiding part in the axial direction; and the sealing cylindrical surface of the piston is matched with a cylinder body primary hole in an interval mode, the guiding part is matched with the cylindrical surface of the guide sleeve inner hole in the interval mode, and the guide rail straight grooves are matched with the guide rails in the interval mode. The electric pump for the automobile drive-by-wire braking system has the advantages that the structure is novel, the number of teeth, engaged with the racks, of transposition gear drive wheels is automatically switched under a low-temperature state so that the pressure-building stroke of the piston can be reduced, return stroke time of the piston is increased, timely supplement of braking fluid at a low temperature is facilitated, and the reliable work of the electric pump under the low-temperature state is ensured.

Description

technical field [0001] The invention belongs to the automobile industry and is applied to the automobile wire control braking system. Background technique [0002] With the development of automobile technology, new energy vehicles and smart driving vehicles have become the main direction of automobile development. Most of these two types of vehicles use brake-by-wire systems. When new energy vehicles perform braking energy recovery, the brake-by-wire system needs a high-pressure hydraulic source to provide high-pressure brake fluid at the desired pressure, which coordinates with regenerative braking to meet the driver's braking needs; when intelligent driving vehicles actively intervene in braking , The brake-by-wire system requires a high-pressure hydraulic source to provide high-pressure brake fluid to apply corresponding brake pressure to the vehicle brake wheel cylinder. The traditional vacuum booster with brake master cylinder braking system cannot provide a stable and...

AI Technical Summary

Problems solved by technology

[0004] The invention provides an electric pump for an automobile brake-by-wire system to solve the problem that the volume of high-pressure brake fluid provided by the existing hydraulic pump in a single cycle is small, the amount of brake fluid sucked in each working cycle is small, and the efficiency of outputting high-pressure brake fluid is low. Low, the plunger pump wears quickly, and the problem of service life

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