Electric steering gear torsion bar press-fitting tool

Abstract

The invention relates to the technical field of electric steering gears, in particular to an electric steering gear torsion bar press-fitting tool. According to a previous common press-fitting mode, atorsion bar is connected with an input shaft in an interference fit mode first, and then the torsion bar is inserted into an output shaft and fixedly connected with the output shaft through a stop pin, wherein the input shaft is formed by welding an upper shaft and a lower shaft. The product structure and the press-fitting mode are improved, the upper shaft and the lower shaft of the input shaftare integrally formed, the torsion bar is connected with the input shaft and the output shaft in an interference fit mode, the axial gap between the input shaft and the output shaft and the left-rightcentering of a flat square and a flat groove are controlled firstly, then press-fitting is carried out on the torsion bar, the input shaft and the output shaft, but a tool for the press-fitting modeis not available at present. According to the electric steering gear torsion bar press-fitting tool, the axial gap between the input shaft and the output shaft can be effectively controlled, and left-right centering of the flat square and the flat groove can be effectively controlled, so that the press-fitting quality can be guaranteed, and the product quality can be improved.

Description

technical field [0001] The invention relates to the technical field of an electric steering gear, in particular to a torsion bar press assembly tool for an electric steering gear. Background technique [0002] The torsion bar is the key part of the electric steering gear, and it is generally connected with the input shaft and the output shaft. There is a flat square on the input shaft, and a flat groove on the output shaft. The flat groove is a curved groove, and the two ends of the flat square are arc surfaces. , Both sides are flat bosses, the connection between the input shaft and the output shaft, the flat square and the flat groove match to form a rotating space, and in the process of pressing the torsion bar, it is often necessary to adjust the input shaft and the output shaft The axial clearance and the left and right centering of the flat square and the flat groove are controlled to ensure the press-fit quality, because the press-fit quality directly affects the perf...

AI Technical Summary

Problems solved by technology

After the torsion bar is inserted into the output shaft, due to the fixed position of the stop pin, the axial gap between the input shaft and the output shaft and the left and right centering of the flat square and the flat groove cannot be adjusted, and can only rely on the interference between the torsion bar and the input shaft. Control in advance when connecting, this method is likely to cause the axial gap between the input shaft and the output shaft and the left and right centering error between the flat square and the flat groove to be out of tolerance, and the equipment for drilling and reaming the stop pin hole of the output shaft is complicated and expensive. At the same time, the clamping and welding of the upper and lower shafts of the input shaft is likely to cause deformation and affect product quality

Now, the product structure and press-fitting method are improved, and the upper and lower shafts of the input shaft are integrally formed, and the torsion bar, the input shaft, and the output shaft are all connected by interference, and firstly control the connection between the input shaft and the output shaft. The axial clearance and the left and right alignment of the flat square and the flat groove, and then the torsion bar, the input shaft, and the output shaft are press-fitted, but there is currently no tooling for this press-fitting method

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