Patent US3646820A successfully refreshed from Google Patents.
US3646820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Worm drive for starter motors for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1970-06-19
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Granted: 1972-03-07
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Expires: 1990-06-19
Abstract
Abstract An overrunning clutch connects the start pinion to an axially movable coupling member coupled to the armature-shaft-rotated drive member by an ear that freely engages a longitudinal groove in the drive member, which has an internally threaded sleeve that meshes with the threaded portion of the armature shaft and is turned thereby.
Inventors
- 👤 Erich Vogel
- 👤 Gunter Ulimann
- 👤 Gerhard Pfluger
- 👤 Robert Boach Gmbh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:46
CPC Classifications
F; F02; F02N; F02N15/00; F02N15/02; F02N15/022; F02N15/026; F02N15/04; F02N15/06; Y; Y10; Y10T; Y10T74/00; Y10T74/13
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
160 words
In a starter arrangement for internal combustion engines, a combination comprising a driven gear on the engine; a driving gear arranged to be put into and out of mesh with said driven gear; a rotary input shaft of a starter motor; drive means movable axially of and operatively connected with said input shaft to perform an angular movement in response to axial movement; shifting means for moving said drive means axially; and coupling means comprising a first member radially spaced from said input shaft and provided on said drive means, a second member movable axially of said drive means and coupled to said first member in operative connection with said driving gear to move the latter angularly and axially into mesh with said driven gear in response to axial movement of said drive means, and cushioning means between said second member and said drive means for reducing the severity of shocks transmitted to said drive means during startup and acceleration.
Claim 2
Dependent Claim
160 words
In a starter arrangement for internal combustion engines, a combination comprising a driven gear on the engine; a driving gear arranged to be put into and out of mesh with said driven gear; a rotary input shaft of a starter motor; drive means movable axially of and operatively connected with said input shaft to perform an angular movement in response to axial movement; shifting means for moving said drive means axially; and coupling means comprising a first member radially spaced from said input shaft and provided on said drive means, a second member movable axially of said drive means and coupled to said first member in operative connection with said driving gear to move the latter angularly and axially into mesh with said driven gear in response to axial movement of said drive means, and cushioning means between said second member and said drive means for reducing the severity of shocks transmitted to said drive means during startup and acceleration.
Claim 3
Dependent Claim
31 words
A combination as defined in claim 1, including an overrunning clutch operatively connecting together said second member and said driving gear; and resilient means for biasing said overrunning clutch into engagement.
Claim 4
Dependent Claim
35 words
A combination as defined in claim 2, wherein said driving gear comprises a part adjacent said second member, and said overrunning clutch includes mating teeth on said driving gear part and on said second member.
Claim 5
Dependent Claim
49 words
A combination as defined in claim 3, wherein said second member is movable axially of said drive means, and including a centrifugal force uncoupler for helping to disengage said overrunning clutch against the force of said resilient means when said driving gear is accelerated by the engine started up.
Claim 6
Dependent Claim
83 words
A combination as defined in claim 4, wherein said centrifugal force uncoupler includes an annular ball race in said driving gear part, at least two uniformly spaced balls in said race, and a ring associated with said second member and having a conical surface that is substantially contiguous with said balls and is sufficiently borne upon thereby when the engine accelerates during starting to establish a component of force that acts against said second member to oppose the force of said resilient means.
Claim 7
Dependent Claim
44 words
A combination as defined in claim 1, wherein said second member includes a male element and said first member a female element freely accepting said male element so as to permit free axial movement of said second member with respect to said drive means.
Claim 8
Dependent Claim
34 words
A combination as defined in claim 1, wherein said drive means comprises a wall extending radially of said input shaft and adjacent said second member, and said cushioning means is held on said wall.
Claim 9
Dependent Claim
27 words
A combination as defined in claim 7, wherein said drive means includes a sleeve that surrounds a length of said input shaft and is operatively connected thereto.
Claim 10
Dependent Claim
28 words
A combination as defined in claim 8, wherein said sleeve is internally threaded and said input shaft length has a thread that meshes with that of said sleeve.
References Cited (Backward Citations)
US2554445A
Cited
US3140617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |