Yoke of planetary gear-type starter, manufacturing apparatus the

Details Yoke of planetary gear-type starter, manufacturing apparatus the Yoke of planetary gear-type starter, manufacturing apparatus the

1997-02-04

1999-08-03

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With metal deformation of different type

72 85, B21D 2216

Patent

active

059310375

ABSTRACT:
A manufacturing method of a cylindrical yoke including a bottom portion to which an opening 12a is formed to journal the starter output shaft of a planetary gear-type starter incorporating a planetary gear reducer, and an inner peripheral gear portion formed to the vicinity of the bottom portion, the yoke functioning as the field magnet of a motor in the planetary gear-type starter. The yoke is formed by subjecting a metal disk 10 to cold spinning. As a result the inner peripheral gear portion of the yoke and a thin portion can be easily formed and miniaturization, reduction in weight and cost reduction are realized.

REFERENCES:
patent: 4488073 (1984-12-01), Morishita
patent: 4520285 (1985-05-01), Isozumi et al.
patent: 4551122 (1985-11-01), Kraft et al.
patent: 4671125 (1987-06-01), Yabunaka
patent: 5031296 (1991-07-01), Magnoni
patent: 5619879 (1997-04-01), Friese
patent: 5806358 (1998-09-01), Rolf
DE-P. Industrieanzeiger 38-92, pp. 27 to 29, Sep. 1992.

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