US3868858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starter for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1974-02-07
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Granted: 1975-03-04
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Expires: 1994-02-07
Abstract
Abstract A compact starter for internal combustion engines wherein the armature shaft of an electric motor rotates an axially movable pinion through the medium of an overrunning clutch which allows the pinion to rotate relative to the shaft when the pinion meshes with a gear of the engine and the gear is rotated by the engine upon completion of the starting operation. A shifting sleeve for the pinion has steep internal threads meshing with complementary external threads of the shaft and is connected to the clutch and pinion so that the pinion moves with the sleeve toward engagement with the gear of the internal combustion engine when the sleeve is held against rotation with the shaft by a brake whose parts are mounted on and surround the sleeve. The brake operates between a flange of the sleeve and a blocking cylinder which is rotatably mounted on but normally rotates with the sleeve by way of the brake. An electromagnet is energizable in response to starting of the motor to move a pin into engagement with one of several external teeth on the blocking cylinder whereby the brake holds the sleeve against rotation and the sleeve moves axially of the rotating shaft to engage the pinion with the gear. When the electromagnet is deenergized, a return spring is free to move the sleeve axially in a direction to disengage the pinion from the gear.
Inventors
- 👤 Wolfgang Reichardt
- 👤 Lucien Blanchard
- 👤 Jean Denamps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:42
CPC Classifications
F; F02; F02N; F02N15/00; F02N15/02; F02N15/04; F02N15/06; F02N15/066; Y; Y10; Y10T; Y10T74/00; Y10T74/13; Y10T74/131
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
244 words
In a starter for an internal combustion engine having a torque-receiving first gear, a combination comprising a motor having a drive shaft rotatable in a predetermined direction; operating means actuatable to start said motor; a second gear rotatably mounted on and movable axially of said shaft in a first direction from a disengaged first position to a second position of engagement with said first gear and in a second direction back to said first position; a shifting sleeve surrounding said shaft; an overrunning clutch mounted on said shaft and arranged to rotate said second gear in response to rotation of said shaft and to permit said second gear to rotate relative to said shaft in said predetermined direction when said second gear is driven by said first gear at a speed exceeding the speed of said shaft; displacing means having portions provided on said shaft and on said sleeve for moving said sleeve axially in said first direction when said sleeve is held against rotation with said shaft; means for connecting said second gear and said clutch to said sleeve so that said second gear moves toward said second position in response to axial movement of said sleeve in said first direction; and means for holding said sleeve against rotation with said shaft; comprising a blocking member rotatably mounted on said sleeve, arresting means actuatable to interrupt the rotation of said blocking member, and brake means interposed between said blocking member and said sleeve.
Claim 2
Dependent Claim
244 words
In a starter for an internal combustion engine having a torque-receiving first gear, a combination comprising a motor having a drive shaft rotatable in a predetermined direction; operating means actuatable to start said motor; a second gear rotatably mounted on and movable axially of said shaft in a first direction from a disengaged first position to a second position of engagement with said first gear and in a second direction back to said first position; a shifting sleeve surrounding said shaft; an overrunning clutch mounted on said shaft and arranged to rotate said second gear in response to rotation of said shaft and to permit said second gear to rotate relative to said shaft in said predetermined direction when said second gear is driven by said first gear at a speed exceeding the speed of said shaft; displacing means having portions provided on said shaft and on said sleeve for moving said sleeve axially in said first direction when said sleeve is held against rotation with said shaft; means for connecting said second gear and said clutch to said sleeve so that said second gear moves toward said second position in response to axial movement of said sleeve in said first direction; and means for holding said sleeve against rotation with said shaft; comprising a blocking member rotatably mounted on said sleeve, arresting means actuatable to interrupt the rotation of said blocking member, and brake means interposed between said blocking member and said sleeve.
Claim 3
Dependent Claim
29 words
A combination as defined in claim 1, wherein said displacing means comprises a steep external thread on said shaft and a mating complementary internal thread in said shifting sleeve.
Claim 4
Dependent Claim
41 words
A combination as defined in claim 1, wherein said brake means surrounds said shifting sleeve and includes a ring-shaped member movable axially but sharing all angular movements of said sleeve and means for biasing said ring-shaped member against said blocking member.
Claim 5
Dependent Claim
68 words
A combination as defined in claim 3, wherein said blocking member comprises at least one external projection and said arresting means comprises an element movable into and from engagement with said projection to thereby respectively prevent and permit rotation of said blocking member with said sleeve, an electromagnet, and motion transmitting means for moving said element into engagement with said projection in response to energization of said electromagnet.
Claim 6
Dependent Claim
49 words
A combination as defined in claim 4, wherein said motion transmitting means comprises a lever having a first arm coupled to said element and a second arm constituting the armature of said electromagnet, and means for biasing said lever in a direction to disengage said element from said projection.
Claim 7
Dependent Claim
64 words
A combination as defined in claim 1, further comprising a housing for said motor, said second gear, said sleeve, said clutch and saId means for holding said sleeve against rotation, abutment means installed in said housing, and means for biasing said sleeve in said second direction to thereby disengage said second gear from said first gear in response to deactivation of said operating means.
Claim 8
Dependent Claim
66 words
A combination as defined in claim 6, wherein said means for biasing comprises a spring reacting against said abutment means and bearing against said sleeve, said brake means comprising a ring-shaped member which is movable axially of but shares the angular movements of said sleeve and bears against said abutment means under the action of said biasing means in said first position of said second gear.
Claim 9
Dependent Claim
103 words
A combination as defined in claim 6, wherein said sleeve comprises a set of axially parallel external teeth and said brake means comprises a ring-shaped member movable axially on said sleeve and having internal teeth mating with said external teeth, said brake means further comprising a first disk interposed between one end of said blocking member and said ring-shaped member, a second disk interposed between a flange of said sleeve and the other end of said blocking member, and second means for biasing said ring-shaped member and said first disk against said blocking member whereby said blocking member bears against said second disk.
Claim 10
Dependent Claim
33 words
A combination as defined in claim 8, further comprising means for non-rotatably connecting said first disk to said blocking member and for non-rotatably connecting said second disk to said flange of said sleeve.
Claim 11
Dependent Claim
31 words
A combination as defined in claim 8, further comprising a retainer on said sleeve, said second biasing means comprising a spring reacting against said retainer and bearing against said ring-shaped member.
Claim 12
Dependent Claim
42 words
A combination as defined in claim 8, wherein said first disk comprises at least one first projection extending into a recess of said blocking member and said second disk comprises at least one second projection extending into a recess of said flange.
Claim 13
Dependent Claim
35 words
A combination as defined in claim 6, wherein said abutment means comprises a friction generating lining and said biasing means urges said ring-shaped member against said lining in said first position of said second gear.
Claim 14
Dependent Claim
93 words
A combination as defined in claim 1, wherein said blocking member comprises at least one external projection and a circumferential groove adjacent to said projection, said arresting means comprising an element movable into and from engagement with said projection to thereby respectively prevent and permit rotation of said blocking member and an electromagnet energizable to move said element into engagement with said projection in the first position of said second gear, said element extending into said groove in the second position of said second gear and in the energized condition of said electromagnet.
Claim 15
Dependent Claim
86 words
A combination as defined in claim 1, wherein said motor is an electric motor and said operating means comprises a normally open switch which starts said motor in response to closing thereof, and further comprising a housing for said motor, said second gear, said sleeve, said clutch and said means for holding said sleeve against rotation, said arresting means comprising an electromagnet which is installed in said housing and is energizable in response to closing of said switch to thereby prevent rotation of said blocking member.
Claim 16
Dependent Claim
79 words
A combination as defined in claim 1, further comprising a housing for said motor, said sleeve, said second gear, said clutch and said means for holding said sleeve against rotation, said blocking member having an annulus of external teeth and said arresting means comprising an element movable in a bore of said housing substantially radially of said blocking member into and from engagement with one of said teeth to thereby respectively prevent and permit rotation of said blocking member.
Claim 17
Dependent Claim
30 words
A combination as defined in claim 15, further comprising means for limiting the extent of movement of said element in said bore in a Direction away from said blocking member.
Claim 18
Dependent Claim
74 words
A combination as defined in claim 15, wherein said element has a socket and said arresting means further comprises a lever pivotably mounted in said housing and having a first arm extending into said socket and a second arm, and an electromagnet energizable to pivot said lever by way of said second arm in a direction to move said element into engagement with one of said teeth through the medium of said first arm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |