Pinion-and-rack type power steering gear valve element assembly

Abstract

The invention relates to a pinion-and-rack type power steering gear valve element assembly and belongs to the technical field of automobile steering gears. The steering gear valve element assembly is composed of a pinion shaft, a valve sleeve, an input shaft and a torsion bar. The input shaft is installed on the pinion shaft through the valve sleeve. The torsion bar is installed in an inner hole of the input shaft through a cylindrical pin. A blind groove A and a blind groove B are correspondingly formed between the valve sleeve and the torsion bar. An oil inlet A and an oil outlet B are formed in the valve sleeve. The oil inlet A and the oil outlet B are communicated with the blind groove A and the blind groove B respectively. Compared with an existing power steering gear valve element assembly, needle bearings used for supporting the input shaft and the torsion bar are omitted, so that the product structure is optimized, the quality of the process that the torsion bar is pressed through the pinion shaft and the bouncing quality after a pin is punched into the valve element assembly are improved, the production and manufacturing cost is reduced to a certain degree, the output is improved, the quality control in the process is stable, and the requirements for automobile loading and quality are met.

Description

technical field [0001] The invention relates to a rack and pinion type power steering gear valve core assembly, which belongs to the technical field of automobile steering gears. Background technique [0002] The rack-and-pinion power steering gear spool is the core component of the power steering gear. Due to the structural limitations of each part of the spool assembly, the processing process of each spool part is complicated, the investment in production equipment is large, the production cycle is low, and the single piece The cost of parts is high. And the existing spool assembly has the following problems: (1), the process quality of the gear shaft press-fitting torsion bar is unstable, and the torsion bar jumps greatly after press-fitting. Large torsion bar jumps can easily lead to large jumps of the valve core assembly after cancellation of the valve core assembly. The lag value in the power steering performance testing process is large, and the performance test resu...

AI Technical Summary

Problems solved by technology

And the existing spool assembly has the following problems: (1) The quality of the process of press-fitting the gear shaft to the torsion bar is unstable, and the torsion bar jumps greatly after press-fitting

Large torsion bar jumps can easily lead to large jumps of the valve core assembly after cancellation of the valve core assembly. The lag value in the power steering performance testing process is large, and the performance test results are not true, resulting in misjudgment and unnecessary quality loss. The comprehensive competitiveness of finished products has declined

(2) There are a large number of spool parts, among which the needle roller bearing only plays the role of supporting the torsion bar assembly of the input shaft and the gear shaft, and its function contribution is low. dead, steering failure

At the same time, the existing spool assembly still has high manufacturing costs, unsatisfactory output quantity, unstable process quality control, and cannot meet customer loading and quality requirements.

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