Patent US3581858A successfully refreshed from Google Patents.
US3581858A
Expired / Lapsed
US
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Fluid actuator
Assignee: Borg Warner Corp
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Filing: 1968-09-03
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Granted: 1971-06-01
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Expires: 1988-09-03
Abstract
Abstract A fluid actuator for a friction device adapted for installation in a transmission mechanism including an annular piston mounted in an annular chamber provided in a rotary housing including passage means to supply fluid to move said piston and including a balance chamber adapted to receive lubricating fluid from the transmission whereby when fluid is exhausted from said passage means to disengage said friction device, centrifugal actuation of the residual fluid in said fluid passage and the actuating-fluid chamber will be balanced by centrifugal actuation of the fluid contained within the balance chamber.
Inventors
- 👤 William J Haley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:28
CPC Classifications
F; F16; F16D; F16D25/00; F16D25/06; F16D25/062; F16D25/063; F16D25/0635; F16D25/0638; F16D21/00; F16D21/02; F16D21/06; F16D25/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
In an actuator for an engageable friction device, a rotary housing having an annular chamber with an annular piston slidably mounted therein, an actuation chamber formed in said rotary housing on one side of said piston, an annular plate fixedly mounted in said housing and defining a balance chamber on the other side of said piston, a source of fluid pressure, fluid passage means in said rotary housing and spaced radially outwardly of said annular chamber connected to said actuating chamber and connectable to said source of fluid pressure, piston return means adapted to return said piston when fluid is exhausted from said actuating chamber; a lubricating fluid passage for said device connected to said balance chamber, and said side of said piston associated with said balance chamber having a larger area exposed to fluid in said balance chamber than the area of the side of said piston exposed to fluid within said actuation chamber whereby when fluid is exhausted from said actuating chamber centrifugal force acting on residual fluid in said actuating chamber and passage will be ineffective to engage said friction device due to an opposing force developed by centrifugal force acting on the fluid in said balance chamber.
Claim 2
Dependent Claim
201 words
In an actuator for an engageable friction device, a rotary housing having an annular chamber with an annular piston slidably mounted therein, an actuation chamber formed in said rotary housing on one side of said piston, an annular plate fixedly mounted in said housing and defining a balance chamber on the other side of said piston, a source of fluid pressure, fluid passage means in said rotary housing and spaced radially outwardly of said annular chamber connected to said actuating chamber and connectable to said source of fluid pressure, piston return means adapted to return said piston when fluid is exhausted from said actuating chamber; a lubricating fluid passage for said device connected to said balance chamber, and said side of said piston associated with said balance chamber having a larger area exposed to fluid in said balance chamber than the area of the side of said piston exposed to fluid within said actuation chamber whereby when fluid is exhausted from said actuating chamber centrifugal force acting on residual fluid in said actuating chamber and passage will be ineffective to engage said friction device due to an opposing force developed by centrifugal force acting on the fluid in said balance chamber.
References Cited (Backward Citations)
US3215237A
Cited
US2876743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |