Non-circular gear sector variable displacement modification overcut elimination method

Abstract

The invention discloses a non-circular gear sector variable displacement modification overcut elimination method. The method comprises the steps of (1) constructing a trajectory equation of a variable displacement modification instantaneous center point; (2) in combination with the trajectory equation of the instantaneous center point, calculating a non-modification non-circular gear sector tooth profile based on a gear meshing principle, and according to a modification function, superposing the modification amount corresponding to each rotation angle of the gear sector on the tooth profile along the common normal direction of the non-modification non-circular gear sector to obtain a variable displacement modification theoretical tooth profile equation; (3) on the basis of the gear meshing principle, reversely solving tool tooth profile equation by combining the theoretical tooth profile equation and the transmission ratio function; and (4) machining the non-circular sector by using the reverse tool. According to the method, tooth profile overcut in the non-circular gear sector machining process can be thoroughly eliminated; and the machining process of the non-circular gear 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 in particular relates to a non-circular gear fan displacement modification and overcut elimination method. Background technique [0002] The non-circular gear pair is widely used in automobile steering gear ratio transmission. The non-circular gear sector of the steering gear rocker shaft often adopts the segmented straight line variable displacement modification function to modify the tooth profile to increase the amount of tooth profile crowning and improve the performance of the vehicle. Back to normality of steering. However, there is overcutting of the tooth profile in this kind of non-circular tooth sector displacement modification, which leads to a small amount of actual crowning, 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...

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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