Maching process and mold for annulus of external gear reduced one-way device

Abstract

The present invention discloses machining process and special mold for annulus of external gear reduced one-way device. The making process includes cold extruding the blank inside a cold mold in a pressing machine, re-extruding inside the secondary mold to form outer surface gear, further machining and heat treatment to complete the machining. The mold includes male mold, outer teeth extruding mold, female mold block, mandrel and mandrel guiding sleeve. The making process has effectively controlled product machining precision, high efficiency and low cost.

Description

technical field [0001] The invention relates to a manufacturing method of an external gear reduction type one-way gear outer ring gear used in an automobile starter, and a special mold required for realizing the method. Background technique [0002] The outer ring gear is an important part of the external gear reduction type one-way device. The driving torque of the starter motor is transmitted to the meshing shaft of the starter through the outer ring gear to realize the starting function of the starter. Utilizing cold press processing to manufacture toothed gear blanks is a commonly used method for manufacturing external ring gears. For example, Japanese patent document Sho 62-112829 separates a process and mold for manufacturing toothed gear blanks by stamping. This This method can complete the production of the gear blank in one process. But when producing the outer ring gear, because the outer ring gear of the external gear reduction type one-way device has a relativel...

AI Technical Summary

Problems solved by technology

However, when manufacturing the outer ring gear, due to the complex internal and external structure of the outer ring gear of the external gear reduction type one-way device, it is difficult to stamp the outer ring gear at one time, so this method cannot be implemented

[0003] Chinese patent 92112696 discloses a cold drawing method for toothed gear blanks, which gradually deforms the blank through the gradual deformation of the mold. However, when this method is used in the manufacture of the outer ring gear of the checker, there are complex molds, The defects of low work efficiency and poor machining accuracy are especially easy to cause the eccentricity error of the outer ring gear

However, due to the low work efficiency of this processing method, the production cost is high, which is not conducive to the improvement of production efficiency of enterprises.

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