Automobile electric booster sterring system and treating method for rotary shaft thereof

Abstract

The electric booster steering system for automobile includes rotating shaft comprising worm gear shaft and steering shaft connected together, worm gear, servo motor with output meshed with the worm gear, control module for the servo motor, and rotating shaft position sensor and automobile speed sensor for acquiring signal. It features a sliding sleeve capable of sliding on the rotating worm gear shaft and with outer ring notch, and the position sensor, which is torsion moment sensor with positioning shaft end capable of being connected with the outer ring notch. The rotating shaft may be local HF quenched for raised wear resistance and strength.

Description

technical field [0001] The invention relates to an auxiliary driving mechanism of an automobile, in particular to an electric power steering system of an automobile and a processing method for a rotating shaft thereof. Background technique [0002] Since the 1950s, General Motors Corporation of the United States invented a hydraulic power steering system for automobiles. The power steering system has been applied to automobiles for more than 50 years, and it has solved the problem of automobile steering portability. Because the hydraulic power steering system has defects such as complex structure, high failure rate, easy pollution to the environment, large space in the car, and waste of energy, it has been gradually replaced by the electric power steering system. The electric power steering system uses a control module to analyze the signals from the rotation shaft position sensor and the vehicle speed sensor, so as to further control the servo motor installed on the steerin...

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Problems solved by technology

[0003] Chinese patent 03247079.7 discloses an electric power steering mechanism, in which the position sensor of the rotating shaft is a non-contact photoelectric sensor. Due to the high cost of this sensor, the whole set of steering mechanism is expensive and generally only suitable for the assembly of high-end cars. , not conducive to large-scale installation on low-end cars

This will further increase the cost of the whole set of institutions, which is not conducive to the market competition of products

[0004] In addition, the existing rotating shaft is generally made of more expensive alloy steel materials. In order to improve the strength and wear resistance of the movable parts of the rotating shaft, it is often carburized and quenched before tempering

Because it is carburizing and quenching the whole material, the processing cost is high

In addition, the carburized material brings a lot of inconvenience to its further finishing, which increases the difficulty of processing and reduces the work efficiency.

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