US3666958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starter drive
Assignee: Robert Bosch GmbH
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Filing: 1970-10-21
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Granted: 1972-05-30
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Expires: 1990-10-21
Abstract
Abstract A starter drive for combustion engines has a motor on whose rotatable output shaft is mounted a pinion having freedom of rotation as well as axial displacement relative to the shaft. A motion-transmitting arrangement is provided, including a funnelshaped motion-transmitting element rotatable with the shaft surrounding the same and located adjacent one end of the pinion with its open side facing the latter, and an elastically yieldable annular coupling member surrounding and fast with the pinion at the one end thereof and conically converging on its outer periphery towards the funnel-shaped element so that, when the coupling member is received in the latter, frictional motiontransmission will be established between the shaft and the pinion.
Inventors
- 👤 Walter Ruhle
- 👤 Otto Barthruff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:30
CPC Classifications
F; F02; F02N; F02N15/00; F02N15/02; F02N15/04; F02N15/06; F02N15/062; F02N15/063; F02N15/022; F02N15/025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
209 words
A starter drive for combustion engines, comprising an electromotor having a rotatable output shaft; a pinion mounted on said shaft for axial displacement relative thereto from a normal rest position to an operating position, said pinion having at one axial end a portion of reduced diameter; an annular coupling ring of elastically yieldable material mounted on said portion of reduced diameter, and having an outer circumferential surface which conically tapers axially of said pinion in direction from the operating position of said pinion to the rest position thereof; a discrete funnel-shaped motion-transmitting member surrounding said shaft adjacent said one axial end of said pinion and movable relative thereto, and having a divergent open side facing said coupling ring; cooperating steep-pitch threads on said member and said shaft for enabling the former to advance along the latter under the influence of inertial force in response to rotation of said shaft, to thereby contact and iniTially axially displace said pinion to said operating position with subsequent frictional transmission of motion from said member via said ring to said pinion; and biasing means surrounding said shaft adjacent the other axial end of said pinion and permanently urging said pinion axially of said shaft and into said open side of said motion-transmitting member.
Claim 2
Dependent Claim
209 words
A starter drive for combustion engines, comprising an electromotor having a rotatable output shaft; a pinion mounted on said shaft for axial displacement relative thereto from a normal rest position to an operating position, said pinion having at one axial end a portion of reduced diameter; an annular coupling ring of elastically yieldable material mounted on said portion of reduced diameter, and having an outer circumferential surface which conically tapers axially of said pinion in direction from the operating position of said pinion to the rest position thereof; a discrete funnel-shaped motion-transmitting member surrounding said shaft adjacent said one axial end of said pinion and movable relative thereto, and having a divergent open side facing said coupling ring; cooperating steep-pitch threads on said member and said shaft for enabling the former to advance along the latter under the influence of inertial force in response to rotation of said shaft, to thereby contact and iniTially axially displace said pinion to said operating position with subsequent frictional transmission of motion from said member via said ring to said pinion; and biasing means surrounding said shaft adjacent the other axial end of said pinion and permanently urging said pinion axially of said shaft and into said open side of said motion-transmitting member.
Claim 3
Dependent Claim
37 words
A starter drive as defined in claim 1, said pinion having a peripheral annulus of gear teeth, and said coupling ring having an axial end face directed towards said other end and supported by said gear teeth.
Claim 4
Dependent Claim
31 words
A starter drive as defined in claim 2; further comprising a washer surrounding said extension intermediate said gear teeth and coupling ring for protecting the latter against damage from the former.
Claim 5
Dependent Claim
16 words
A starter drive as defined in claim 1, said coupling ring being unitary with said pinion.
Claim 6
Dependent Claim
23 words
A starter drive as defined in claim 1, wherein at least one of said coupling ring and pinion consists of synthetic plastic material.
Claim 7
Dependent Claim
21 words
A starter drive as defined in claim 1, wherein said coupling ring and said pinion both consist of synthetic plastic material.
Claim 8
Dependent Claim
25 words
A starter drive as defined in claim 1, wherein said coupling ring consists of, and said pinion at least predominantly consists of synthetic plastic material.
Claim 9
Dependent Claim
34 words
A starter drive as defined in claim 1, said biasing means comprising a helical spring surrounding said shaft adjacent said other end of said pinion and bearing upon the latter and an abutment, respectively.
Claim 10
Dependent Claim
85 words
A starter drive for combustion engines, comprising a motor having a rotatable output shaft; a pinion on said shaft axially and rotationally displaceable relative thereto; and motion-transmitting means, including a funnel-shaped motion-transmitting element rotatable with said shaft surrounding the same adjacent one end of said pinion and having an open side facing the latter and an elastically yieldable annular coupling member surrounding and engaging said one end and conically converging towards said element so as to be receivable in the latter in frictionally motion-transmitting relationship.
Claim 11
Dependent Claim
85 words
A starter drive for combustion engines, comprising a motor having a rotatable output shaft; a pinion on said shaft axially and rotationally displaceable relative thereto; and motion-transmitting means, including a funnel-shaped motion-transmitting element rotatable with said shaft surrounding the same adjacent one end of said pinion and having an open side facing the latter and an elastically yieldable annular coupling member surrounding and engaging said one end and conically converging towards said element so as to be receivable in the latter in frictionally motion-transmitting relationship.
References Cited (Backward Citations)
US2455328A
Cited
US2668917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |