A rack pressure block for rack and pinion steering gear

Abstract

The invention discloses a rack pressing block for a gear rack steering engine. The rack pressing block for the gear rack steering engine is characterized in that a base body is made of aluminum alloy materials, the friction face of the base body and a mating plate rack is provided with an antifriction spraying layer, the antifriction spraying layer comprises the following materials, by mass percent, 5% to 20% of molybdenum disulfides, 2% to 5% of copper fine powder, 7% to 15% of graphite, 0.1% to 0.5% of silicon oxide fine powder, 0.5% to 10% of polytetrafluoroethene fine powder, 2% to 8% of curing agents, 0.5% to 5% of flexibilizer, and the balance epoxy resins. According to the rack pressing block for the gear rack steering engine, a composite material pressing piece is replaced by the antifriction spraying layer, the shape error of a circular arc face of the rack pressing block is reduced, the clearance fluctuation between transmission pairs is reduced, and stability of transmission pair meshing is increased; the aluminum alloy base body is adopted, the weight is about 31% to 45% of the weight of a base body in the prior art, weight reduction and consumption reduction are achieved, and the problem of rusting of an iron base body is solved, the production processes are reduced, the period is shortened, and the production cost can be reduced by 10% to 15%.

Description

technical field [0001] The invention belongs to the technical field of auto parts manufacturing, in particular to a rack pressing block for a rack and pinion steering gear. Background technique [0002] The basic structure of the rack and pinion steering gear for automobiles is a pair of pinion and rack that mesh with each other. When the steering shaft drives the pinion to rotate, the rack will move in a straight line, and the rack can directly drive the tie rod. Turn the steering wheel. The rack press block is mainly used to adjust the gap between the steering gear and the rack to ensure that the gear and the rack mesh with a small gap, so that the gear and rack transmission pair meshes smoothly, and eliminates the abnormality generated during the use of the automobile steering gear. loudness and noise. At present, the briquetting block of the rack and pinion steering machine generally adopts a two-body combined briquetting structure, which is specifically composed of a ...

AI Technical Summary

Problems solved by technology

[0003] 1. Since the metal material matrix and the composite sheet are riveted together by molding, the deformation of the composite sheet is inconsistent, which causes a large error between the shape of the sheet working surface and the ideal shape, resulting in a large error in the steering gear assembly. The gap between the gear and the rack fluctuates, which affects the smoothness of the meshing of the rack and pinion transmission pair

[0004] 2. There are many production processes, long cycle and high cost

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