Steering knuckle and bushing push-free process

Abstract

The invention provides a steering knuckle and bushing push-free process. The process comprises the following steps that S1, a bushing is placed in a numerically controlled lathe, and an excircle guideangle at the bottom of the bushing is turned and formed; S2, a steering knuckle is fixed in a vertical machining center, and main pin holes of an upper lug and a lower lug of the steering knuckle arebored and formed through rough boring, chamfering and fine boring by adopting a fine machining process; S3, pretreatment before press-in is carried out, specifically, the bushing is placed in a liquid nitrogen environment to be treated for 2-3 hours; and S4, press fitting of the bushing is carried out, the bushing is pressed into the main pin holes in the two sides by adopting a press fitting machine. According to the process, the improvements in three aspects of processing technology, structure and mounting operation of the bushing and the steering knuckle are adopted, which are different from the prior art that an ironing rod needs to be used for ironing and pushing the interior of the bushing, so that the steering knuckle and bushing push-free process is realized, the bushing is smallin deformation, free of bulges, good in coaxiality and complete and attractive in inner hole surface of the bushing after pressing, and finally, the purpose of prolonging the service life of the steering knuckle, the bushing, a main pin and even the whole front axle is achieved.

Description

technical field [0001] The invention relates to the technical field of steering knuckle processing and installation, in particular to a technology for avoiding pushing of a steering knuckle bush. Background technique [0002] Steering knuckle, also known as "claw horn", is one of the important parts in the steering axle of a car, which can make the car run stably and transmit the driving direction sensitively. The steering knuckle is the hinge for the steering of the wheel, generally in the shape of a fork. The upper and lower forks have two coaxial holes for installing kingpins, and the steering knuckle journal is used for installing wheels. The two lugs of the pin hole on the steering knuckle are connected with the fist-shaped parts at both ends of the front axle through the kingpin, so that the front wheel can deflect at a certain angle around the kingpin to steer the car. In order to reduce wear, a bronze bushing is pressed into the pin hole of the steering knuckle, an...

AI Technical Summary

Problems solved by technology

However, the inner hole of the bush extruded in this way will rebound under the action of residual stress, and the inner hole will become smaller after the rebound, making it difficult to assemble the kingpin, which will eventually affect the smooth assembly of the bush and the kingpin

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