A method for eliminating overcutting of non-circular tooth sector deformation and modification

Abstract

The invention discloses a method for eliminating overcutting of deformation and modification of non-circular tooth sector, comprising: (1) constructing the trajectory equation of the instantaneous center point of the deformation and modification; (2) combining the trajectory equation of the instantaneous center point, based on The gear meshing principle is used to calculate the tooth profile of the unmodified non-circular tooth sector. According to the modification function, the modification amount corresponding to each rotation angle of the tooth sector is superimposed on the tooth profile along the common normal direction of the unmodified non-circular toothed sector, and the displacement is obtained. Modified theoretical tooth profile equation; (3) Based on the principle of gear meshing, combined with the theoretical tooth profile equation and transmission ratio function, reverse the tool tooth profile equation; (4) Use the reversed tool to process the non-circular tooth sector. The invention can completely eliminate the overcut of the tooth profile in the machining of the non-circular toothed sector; the machining process of the non-circular toothed sector of the rocker arm shaft is simplified, and the production efficiency of the rocker arm shaft is improved.

Description

technical field [0001] The invention belongs to the technical field of gear-shaping processing, and particularly relates to a method for eliminating over-cutting of non-circular tooth sector deformation and modification. Background technique [0002] The non-circular gear pair is widely used in automobile steering gear ratio transmission. The non-circular toothed sector of the rocker shaft of the steering gear often uses the segmented straight line displacement modification function to modify the tooth profile to increase the tooth profile drum and improve the automobile. Steering back to positive. However, there is tooth profile overcut in this kind of non-circular tooth sector displacement modification, which leads to the fact that the actual bulging amount is too small and cannot reach the theoretical design value. Due to the lack of understanding of the overcutting phenomenon and the generation mechanism in the deformation and modification of the non-circular tooth sect...

AI Technical Summary

Problems solved by technology

However, there is overcutting of the tooth profile in this kind of non-circular tooth sector displacement modification, resulting in the actual crowning amount being too small, which cannot reach the theoretical design value

Due to the lack of understanding of the overcut phenomenon and its mechanism in the modification of non-circular tooth sectors, enterprises in actual production often rely on experience and repeatedly try to make up the crowning amount of non-circular sector tooth profiles, resulting in low production efficiency. low precision

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