US3593598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic power transmission controls
Assignee: Ford Motor Co
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Filing: 1969-08-05
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Granted: 1971-07-20
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Expires: 1989-08-05
Abstract
Abstract This specification discloses a control valve system for a geared, automatic, power transmission mechanism, including fluid pressure operated clutches and brakes for establishing various speed ratios. During operation in the lowest speed ratio, the gearing torque reaction is accommodated by a friction brake that acts as the reaction point also during reverse drive. A servo pressure modulator establishes the optimum servo pressure during forward drive acceleration in the lowest speed ratio. Provision is made for overruling the pressure modulating action of the modulator during reverse drive, thereby causing an increase in the servo operating pressure to accommodate the increased reaction torque requirement during reverse drive.
Inventors
- 👤 William C Winn
- 👤 Stanley D Rosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:30
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/08; F16H61/00; F16H61/02; F16H61/0262; F16H61/0265; F16H61/0267; F16H61/04; F16H2061/0485
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
246 words
A multiple ratio power transmission mechanism adapted to deliver driving torque from a driving member to a driven member, gear elements forming plural torque delivery paths between said driving member and said driven member, clutches and brakes selectively engageable to establish and disestablish at least one underdrive ratio and a reverse-drive ratio, fluid pressure operated servos adapted to actuate said clutches and brakes, a fluid pressure source, a friction brake actuated by one of said servos for establishing a torque reaction point during reversedrive operation and operation in said underdrive ratio, conduit structure interconnecting said servo and said pressure source, a fluid pressure distributor valve means in said conduit structure for controlling distribution of pressure from said source to said servos to establish various speed ratios, multiple-position manual valve means between said distributor valve means and said pressure source for supplying from said pressure source control pressure for said distributor valve means, a modulator valve means in fluid communication with said one servo for modifying the effective pressure made available to said one servo thereby establishing an optimum servo pressure for a smooth ratIo shift to said underdrive ratio, and a fluid connection between said manual valve means and said modulator valve means for supplying a pressure signal distributed from the former to the latter thereby producing a force on the latter which overrules its influence on the pressure in said one servo during reverse-drive operation thereby establishing a higher effective servo pressure during reverse drive.
Claim 2
Dependent Claim
246 words
A multiple ratio power transmission mechanism adapted to deliver driving torque from a driving member to a driven member, gear elements forming plural torque delivery paths between said driving member and said driven member, clutches and brakes selectively engageable to establish and disestablish at least one underdrive ratio and a reverse-drive ratio, fluid pressure operated servos adapted to actuate said clutches and brakes, a fluid pressure source, a friction brake actuated by one of said servos for establishing a torque reaction point during reversedrive operation and operation in said underdrive ratio, conduit structure interconnecting said servo and said pressure source, a fluid pressure distributor valve means in said conduit structure for controlling distribution of pressure from said source to said servos to establish various speed ratios, multiple-position manual valve means between said distributor valve means and said pressure source for supplying from said pressure source control pressure for said distributor valve means, a modulator valve means in fluid communication with said one servo for modifying the effective pressure made available to said one servo thereby establishing an optimum servo pressure for a smooth ratIo shift to said underdrive ratio, and a fluid connection between said manual valve means and said modulator valve means for supplying a pressure signal distributed from the former to the latter thereby producing a force on the latter which overrules its influence on the pressure in said one servo during reverse-drive operation thereby establishing a higher effective servo pressure during reverse drive.
Claim 3
Dependent Claim
73 words
The combination as set forth in claim 1 wherein said modulator valve means is hydraulically connected to said manual valve means through a control signal passage, said control signal passage communicating with said pressure source through said manual valve means when said manual valve means assumes a reverse-drive position, said control signal passage communicating with the exhaust region through said manual valve means when said manual valve means assumes a forward driving position.
Claim 4
Dependent Claim
123 words
The combination as set forth in claim 1 wherein said modulator valve means comprises a valve spool, a valve chamber within which said spool is received, a spring urging normally said valve spool in one direction, said spool having two valve lands, the conduit structure for said servo communicating with said valve chamber at a location intermediate said valve lands, an exhaust port communicating with said said valve chamber, a feedback passage communicating with one side of said valve chamber and with said servo whereby said valve chamber and with said servo whereby said valve spool modulates the pressure made available to said servo thereby establishing a controlled servo pressure of optimum value to assure a quality ratio shift into said underdrive ratio.
Claim 5
Dependent Claim
114 words
The combination as set forth in claim 2 wherein said modulator valve means comprises a valve spool, a valve chamber within which said spool is received, a spring urging normally said valve spool in one direction, said spool having two valve lands, the conduit structure for said servo communicating with said valve chamber at a location intermediate said valve lands, an exhaust port communicating with said valve chamber, a feedback passage communicating with one side of said valve chamber and with said servo whereby said valve spool modulates the pressure made available to said servo thereby establishing a controlled servo pressure of optimum value to assure a quality ratio shift into said underdrive ratio.
Claim 6
Dependent Claim
54 words
The combination as set forth in claim 3 wherein said control signal passage extends from said manual valve to said modulator valve means and communicates with said valve chamber in the region of said valve spring thereby establishing a pressure force during reverse-drive operation that overrules the modulating action of said modulator valve means.
Claim 7
Dependent Claim
54 words
The combination as set forth in claim 4 wherein said control signal passage extends from said manual valve to said modulator valve means and communicates with said valve chamber in the region of said valve spring thereby establishing a pressure force during reverse-drive operation that overrules the modulating action of said modulator valve means.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |