US4014420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braked automotive friction clutch
Assignee: ZF Friedrichshafen AG
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Filing: 1975-11-24
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Granted: 1977-03-29
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Expires: 1995-11-24
Abstract
Abstract The output shaft of an automotive friction clutch may be braked during shifting of the transmission into higher gear by a brake disc secured against rotation on the shaft and axially moved into engagement with a friction member on a non-rotating element of the vehicle by a pressure plate backed by a resilient wall of a chamber to which a pressure fluid is admitted when the driver depresses the clutch pedal further than needed for only disengaging the clutch. A switch closed by the pedal opens a solenoid valve in the pressure line to the chamber.
Inventors
- 👤 Hans-Walter Riese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:05
CPC Classifications
F; F16; F16D; F16D67/00; F16D67/02; F16D67/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
A braked clutch arrangement comprising: a. a support including a housing; b. a clutch shaft rotatable relative to said support about an axis; c. a brake member enveloped by said housing and axially movable on said shaft in angularly secured relationship; d. a friction member secured on said support in said housing against rotation about said axis; e. pressure-fluid operated moving means for moving said brake member into engagement with said friction member, 1. said moving means including a pressure member axially movable in said housing in angularly secured relationship and engageable with said brake member for pressing the brake member axially against said friction member; f. clutch release means for releasing said shaft from a driven clutch portion, said clutch release means including a clutch control member mounted for movement between an inoperative position and a clutch releasing position, and further beyond said clutch releasing position; and g. fluid control means responsive to said further movement for controlling flow of pressure fluid to said moving means.
Claim 2
Dependent Claim
167 words
A braked clutch arrangement comprising: a. a support including a housing; b. a clutch shaft rotatable relative to said support about an axis; c. a brake member enveloped by said housing and axially movable on said shaft in angularly secured relationship; d. a friction member secured on said support in said housing against rotation about said axis; e. pressure-fluid operated moving means for moving said brake member into engagement with said friction member, 1. said moving means including a pressure member axially movable in said housing in angularly secured relationship and engageable with said brake member for pressing the brake member axially against said friction member; f. clutch release means for releasing said shaft from a driven clutch portion, said clutch release means including a clutch control member mounted for movement between an inoperative position and a clutch releasing position, and further beyond said clutch releasing position; and g. fluid control means responsive to said further movement for controlling flow of pressure fluid to said moving means.
Claim 3
Dependent Claim
57 words
An arrangement as set forth in claim 1,wherein a yieldably resilient member and said housing bound a chamber connected to said fluid control means for flow of fluid into said chamber, said resilient member engaging said pressure member and moving the engaged pressure member axially toward said brake member under the pressure of fluid in said chamber.
Claim 4
Dependent Claim
43 words
An arrangement as set forth in claim 2, wherein said clutch release means further include a clutch release bearing, a sleeve member coaxially enveloping said shaft and fixedly fastened to said housing, said clutch release bearing being axially movable on said sleeve member.
Claim 5
Dependent Claim
55 words
An arrangement as set forth in claim 2, wherein said clutch release means further include a clutch release bearing including inner and outer bearing rings coaxial with said shaft, one of said bearing rings being fixedly fastened to said housing, and the other bearing ring carrying engagement means for engagement with said driven clutch portion.
Claim 6
Dependent Claim
22 words
An arrangement as set forth in claim 4, further comprising another bearing coaxially interposed between said shaft and said other bearing ring.
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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |