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US5027664A Expired / Lapsed US ⏱️ 0.0 years remaining

Engine starter motor with a planetary speed reduction gear

Assignee: Mitsubishi Electric Corp
•
Filing: 1989-09-05
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Granted: 1991-07-02
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Expires: 2009-09-05
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Abstract

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.

Inventors

  • 👤 Shuzoo Isozumi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 10:08
CPC Classifications
F; F02; F02N; F02N11/00; F02N15/00; F02N15/02; F02N15/04; F02N15/043; F02N15/046; Y; Y10; Y10T; Y10T74/00; Y10T74/13; Y10T74/131; Y10T74/132; Y10T74/137

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 121 words
In a starter motor comprising an electric motor unit, a front bracket, an internal gear forming part of a planetary speed reduction gear, and a bolt for securing said electric motor unit to said front bracket, said passing at an outer peripheral portion of said internal gear, the improvement wherein: said 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 said internal gear and extending in the axial direction thereof, a stem of said bolt is partly engaged by said recessed groove, and a width of said recessed groove is less than a width of said one of said teeth.
Claim 2
Dependent Claim 121 words
In a starter motor comprising an electric motor unit, a front bracket, an internal gear forming part of a planetary speed reduction gear, and a bolt for securing said electric motor unit to said front bracket, said passing at an outer peripheral portion of said internal gear, the improvement wherein: said 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 said internal gear and extending in the axial direction thereof, a stem of said bolt is partly engaged by said recessed groove, and a width of said recessed groove is less than a width of said one of said teeth.
Claim 3
Dependent Claim 149 words
In a starter motor comprising an electric motor unit, a front bracket, an internal gear forming part of a planetary speed reduction gear, and a bolt securing said electric motor unit to a machine frame in which said internal gear is integrally formed, the improvement wherein: said internal gear is 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 said teeth of said internal gear and formed in an end face of said frame, said threaded hole being located at a position in which its inner thread portion contacts an imaginary circle having a radius equal to a thickness dimension of a rim portion necessary for the mechanical strength from the corner portion of the deddendum of said teeth, and said threaded hole is thread-engaged by a tip threaded portion of said bolt.
Claim 4
Dependent Claim 149 words
In a starter motor comprising an electric motor unit, a front bracket, an internal gear forming part of a planetary speed reduction gear, and a bolt securing said electric motor unit to a machine frame in which said internal gear is integrally formed, the improvement wherein: said internal gear is 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 said teeth of said internal gear and formed in an end face of said frame, said threaded hole being located at a position in which its inner thread portion contacts an imaginary circle having a radius equal to a thickness dimension of a rim portion necessary for the mechanical strength from the corner portion of the deddendum of said teeth, and said threaded hole is thread-engaged by a tip threaded portion of said bolt.

References Cited (Backward Citations)

US1933534A Cited
US2093325A Cited
US2645298A Cited
US3315546A Cited
US4412457A Cited
US4520285A Cited
US4528470A Cited
US4590811A Cited
US4852417A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-07-01 1994-12-31 1995-07-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-07-01 1998-12-31 1999-07-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-07-01 2002-12-31 2003-07-02 $7700.00 Window Closed / Lapsed

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