Engine starter motor with a planetary speed reduction gear

Details Engine starter motor with a planetary speed reduction gear Engine starter motor with a planetary speed reduction gear

1989-09-05

1991-07-02

Herrmann, Allan D.

Machine element or mechanism

Engine starters

Automatic

74 7A, 310 83, 475331, F02N 1506, F16H 132

Patent

active

050276646

ABSTRACT:
A starter motor with a planetary speed reduction gear in which a bolt for securing an electric motor unit to a front bracket passes at an outer circumference of an internal gear constituting a planetary speed reduction gear. The internal gear is provided in its outer circumference with a recessed groove with its bottom located on a radial axis passing through the center of one of the teeth of the internal gear and extending in the axial direction, and that a stem of the bolt is partly engaged by the recessed groove. Also, the internal gear may be provided in its outer circumference with an axially-extending threaded hole having a center located on a radial axis passing through the center of one of the teeth of the internal gear and formed in the end face of the frame, the threaded hole being located at a position in which its inner thread portion contacts with an imaginary circle having a radius equal to a thickness dimension of the rim portion necessary for the mechanical strength from the corner portion of the deddendum of the teeth, and that the threaded hole is thread-engaged by a tip threaded portion of the bolt.

REFERENCES:
patent: 1933534 (1933-10-01), Nardone
patent: 2093325 (1937-09-01), Lansing
patent: 2645298 (1953-07-01), Hawkins et al.
patent: 3315546 (1967-04-01), Fritsch
patent: 4412457 (1983-11-01), Colvin et al.
patent: 4520285 (1985-05-01), Isozumi et al.
patent: 4528470 (1985-07-01), Young et al.
patent: 4590811 (1986-05-01), Kasubuchi
patent: 4852417 (1989-08-01), Tanaka

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