Patent US4308940A successfully refreshed from Google Patents.
US4308940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control for a clutch
Assignee: Bosch Transmission Technology BV
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Filing: 1979-11-28
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Granted: 1982-01-05
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Expires: 1999-11-28
Abstract
Abstract Apparatus for controlling a clutch operable by fluid pressure in an operation space includes a fluid supply conduit, a rotatable control valve with a valve member displaceable by centrifugal force against the force of a biasing spring for connecting the fluid supply conduit to the operation space, and a fluid connection between the operation space and the valve member for supplying fluid pressure from the operation space to the valve member in a direction against the centrifugal force.
Inventors
- 👤 Theodorus P. M. Cadee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:17
CPC Classifications
F; F16; F16D; F16D43/00; F16D43/28; F16D43/284; F16D25/00; F16D25/06; F16D25/062; F16D25/063; F16D25/0635; F16D25/0638; Y; Y10; Y10T; Y10T137/00; Y10T137/0971; Y10T137/108; Y10T137/1135
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
An apparatus for controlling a clutch operable by means of a fluid pressure in an operation space, said apparatus comprising a fluid supply conduit, a rotatable control valve with a valve member displaceable by centrifugal force against the force of a biasing spring for connecting the fluid supply conduit to the operation space, and a fluid connection between the operation space and the valve member for supplying fluid pressure from the operation space to the valve member in a direction against the centrifugal force.
Claim 2
Independent Claim
84 words
An apparatus for controlling a clutch operable by means of a fluid pressure in an operation space, said apparatus comprising a fluid supply conduit, a rotatable control valve with a valve member displaceable by centrifugal force against the force of a biasing spring for connecting the fluid supply conduit to the operation space, and a fluid connection between the operation space and the valve member for supplying fluid pressure from the operation space to the valve member in a direction against the centrifugal force.
Claim 3
Dependent Claim
22 words
An apparatus as in claim 1 wherein the valve member is also loadable by the fluid pressure in the fluid supply conduit.
Claim 4
Independent Claim
45 words
An apparatus as in claims 1 or 2 wherein the clutch includes clutch plates which are bathed in the fluid used to control the clutch, said apparatus further including means providing for the limited outflow of fluid from the operation space to the clutch plates.
Claim 5
Dependent Claim
23 words
An apparatus as in claim 3 wherein said means for providing limited outflow of fluid is closable by displacement of the valve member.
Claim 6
Dependent Claim
34 words
An apparatus according to claim 1 or claim 2 wherein said valve member, by further displacement against the force of the spring, closes said fluid connection between the operation space and the valve member.
Claim 7
Dependent Claim
156 words
In a clutch having a rotary input, a rotary output, an engageable and disengageable friction coupling between the input and the output, a fluid pressure supply conduit for supplying fluid to an operation space, and a fluid pressure operated device responsive to the pressure in the operation space for engaging and disengaging the friction coupling, an improved control for said fluid operated device comprising: a fluid pressure control valve assembly rotatable upon rotation of the input, the valve assembly including a valve member displaceable by centrifugal force during rotation of the valve assembly in mode to pass fluid pressure from said supply conduit to said operation space; spring means biasing said valve member in a direction opposite to the direction of displacement by centrifugal force; and fluid connection means for passing fluid pressure from said operation space to the valve member in a mode to load the valve member in the same direction as said spring.
Claim 8
Dependent Claim
156 words
In a clutch having a rotary input, a rotary output, an engageable and disengageable friction coupling between the input and the output, a fluid pressure supply conduit for supplying fluid to an operation space, and a fluid pressure operated device responsive to the pressure in the operation space for engaging and disengaging the friction coupling, an improved control for said fluid operated device comprising: a fluid pressure control valve assembly rotatable upon rotation of the input, the valve assembly including a valve member displaceable by centrifugal force during rotation of the valve assembly in mode to pass fluid pressure from said supply conduit to said operation space; spring means biasing said valve member in a direction opposite to the direction of displacement by centrifugal force; and fluid connection means for passing fluid pressure from said operation space to the valve member in a mode to load the valve member in the same direction as said spring.
Claim 9
Dependent Claim
49 words
A clutch as in claim 6 including means for passing fluid pressure from said fluid supply conduit to said valve member in a mode to load said valve member in the same direction as said spring when said valve member has been moved a predetermined distance by centrifugal force.
Claim 10
Dependent Claim
47 words
A clutch as in claim 6 or claim 7 wherein the friction coupling is bathed in the fluid used to operate said fluid pressure operated device, said control further including conduit means for passing a restricted flow of fluid from said operation space to said friction coupling.
Claim 11
Dependent Claim
35 words
A clutch as in claim 8 wherein said conduit means for passing a restricted flow of fluid is arranged to be closed by displacement of said valve member to a predetermined position by centrifugal force.
Claim 12
Dependent Claim
34 words
A clutch as in claim 6 or claim 7 wherein said valve member is arranged to close said fluid connection means upon movement of said valve member to a predetermined position by centrifugal force.
References Cited (Backward Citations)
US2642844A
Cited
US2903083A
Cited
US3358796A
Cited
US3542174A
Cited
US3556271A
Cited
US3712437A
Cited
US3680398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |