Integral active electric power-assisted steering mechanical structure

Abstract

The invention discloses an integral active electric power-assisted steering mechanical structure. The structure comprises an electric power-assisted steering system, a steering system gear ratio system and a back wheel steering system, wherein the electric power-assisted steering system and the steering system gear ratio system are realized by a steering system variable-gear ratio electric power-assisted steering system; the back wheel steering system is a special device system for supplying steering force to a back wheel; the steering system variable-gear ratio electric power-assisted steering system is realized by an electronically-controlled harmonic gear transmission between a steering wheel and a lower transmission shaft; and the back wheel steering system consists of a support shaftring, an outer shell, a motor stator coil, a permanent magnet rotor, a motor angle sensor, a central hollow shaft, a recirculating ball retarding mechanism, a lock sleeve and a rack shaft. In a steering process, an adjusting motor and a power assisting motor are controlled flexibly and compensate for each other, so that steering sensitivity, portability and operation stability are combined perfectly and operation performance and safety performance are enhanced.

Description

technical field [0001] The invention relates to steering, in particular to an integral active electric power steering mechanical structure applied to automobile four-wheel steering. Background technique [0002] The existing electric power steering system is developed from the original traditional mechanical steering system. The angular transmission ratio of the traditional mechanical steering system is fixed. At present, the electric power steering system cannot change the angular transmission ratio of the steering system, but can only The steering torque is reduced, so the driver's labor intensity cannot be reduced by reducing the steering stroke (steering angle) when parking in place at low speeds, and the requirements for stable steering (low sensitivity) cannot be met at high speeds. [0003] In other words, the steering angle ratio of the steering wheel to the front wheels is always the same whether you are slowing down the narrow streets of the city or running on the ...

AI Technical Summary

Problems solved by technology

If direct steering is used, the driver does not need to turn the steering wheel significantly when passing a sharp bend, but when driving at high speed, the subtle movements of the steering wheel will affect the driving stability; The driving stability on the road is higher, but the handling when cornering must be sacrificed, so the traditional steering system must make a trade-off between safety and comfort

[0004] In addition, most of the current cars are front-wheel steering. When the steering system variable transmission ratio technology is applied, it can solve the problem that the steering angle changes with the speed of the vehicle, which greatly reduces the steering stroke and reduces the labor intensity of parking in place and low-speed steering. The flexibility of car steering has not been greatly improved

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