Patent US3719093A successfully refreshed from Google Patents.
US3719093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock up clutch control
Assignee: Motors Liquidation Co
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Filing: 1971-08-05
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Granted: 1973-03-06
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Expires: 1991-08-05
Abstract
Abstract A control for a transmission having a fluid coupling and a lock up clutch for selectively providing a fluid or mechanical input from a gas turbine engine. A shift valve controls the engagement and disengagement of the lock up clutch in response to a transmission output governor signal or a manual signal in cooperation with the governor signal. The manual signal is controlled by a control valve which also supplies a disengagement bias pressure to the shift valve when the manual signal is not directed to the shift valve. The manual signal is generated in response to an engine operating parameter, such as torque demand, and acts on the shift valve in such a manner as to prevent engagement of the lock up clutch at zero vehicle speed above a predetermined value of the operating parameter.
Inventors
- 👤 J Edmunds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:59
CPC Classifications
F; F16; F16D; F16D47/00; F16D47/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
206 words
A control for an engine driven multi-range transmission having a fluid coupling, and a fluid operated selectively operable lock up clutch, said control comprising, a source of fluid pressure; selector valve means in fluid communication with said source for selecting a plurality of drive ranges including a low range, modulator valve means in fluid communication with said source and operatively connected with the engine for generating a modulated fluid pressure in response to an operating parameter of the engine; governor means for providing a governor pressure proportional to the output speed of the transmission; shift valve means in fluid communication with said source, said governor means, and said lock up clutch and being movable to engaged and disengaged positions for controlling the operation of said lock up clutch; and control valve means in fluid communication with said modulator valve means, said selector valve means and said shift valve means and being operable to supply a disengaging bias pressure to said shift valve means when said selector valve is in a position other than said low range, and operable to supply modulated fluid pressure to said shift valve to provide an engaging bias pressure to said shift valve when said selector valve is in said low range.
Claim 2
Dependent Claim
206 words
A control for an engine driven multi-range transmission having a fluid coupling, and a fluid operated selectively operable lock up clutch, said control comprising, a source of fluid pressure; selector valve means in fluid communication with said source for selecting a plurality of drive ranges including a low range, modulator valve means in fluid communication with said source and operatively connected with the engine for generating a modulated fluid pressure in response to an operating parameter of the engine; governor means for providing a governor pressure proportional to the output speed of the transmission; shift valve means in fluid communication with said source, said governor means, and said lock up clutch and being movable to engaged and disengaged positions for controlling the operation of said lock up clutch; and control valve means in fluid communication with said modulator valve means, said selector valve means and said shift valve means and being operable to supply a disengaging bias pressure to said shift valve means when said selector valve is in a position other than said low range, and operable to supply modulated fluid pressure to said shift valve to provide an engaging bias pressure to said shift valve when said selector valve is in said low range.
Claim 3
Dependent Claim
206 words
A control for an engine driven multi-range transmission having a fluid coupling, and a fluid operated selectively operable lock up clutch, said control comprising, a source of fluid pressure; selector valve means in fluid communication with said source for selecting a plurality of drive ranges including a low range, modulator valve means in fluid communication with said source and operatively connected with the engine for generating a modulated fluid pressure in response to an operating parameter of the engine; governor means for providing a governor pressure proportional to the output speed of the transmission; shift valve means in fluid communication with said source, said governor means, and said lock up clutch and being movable to engaged and disengaged positions for controlling the operation of said lock up clutch; and control valve means in fluid communication with said modulator valve means, said selector valve means and said shift valve means and being operable to supply a disengaging bias pressure to said shift valve means when said selector valve is in a position other than said low range, and operable to supply modulated fluid pressure to said shift valve to provide an engaging bias pressure to said shift valve when said selector valve is in said low range.
Claim 4
Dependent Claim
206 words
A control for an engine driven multi-range transmission having a fluid coupling, and a fluid operated selectively operable lock up clutch, said control comprising, a source of fluid pressure; selector valve means in fluid communication with said source for selecting a plurality of drive ranges including a low range, modulator valve means in fluid communication with said source and operatively connected with the engine for generating a modulated fluid pressure in response to an operating parameter of the engine; governor means for providing a governor pressure proportional to the output speed of the transmission; shift valve means in fluid communication with said source, said governor means, and said lock up clutch and being movable to engaged and disengaged positions for controlling the operation of said lock up clutch; and control valve means in fluid communication with said modulator valve means, said selector valve means and said shift valve means and being operable to supply a disengaging bias pressure to said shift valve means when said selector valve is in a position other than said low range, and operable to supply modulated fluid pressure to said shift valve to provide an engaging bias pressure to said shift valve when said selector valve is in said low range.
Claim 5
Dependent Claim
237 words
A control for an engine driven multi-range transmission having a fluid coupling, and a fluid operated selectively operable lock up clutch; said control comprising, a source of fluid pressure; selector valve means in fluid communication with said source for selecting a plurality of drive ranges including a low range, modulator valve means in fluid communication with said source and operatively connected with the engine for generating a variable modulated fluid pressure in response to an operating parameter of the engine; governor means for providing a governor pressure proportional to the output speed of the transmission; shift valve means in fluid communication with said source, said governor means, and said lock up clutch and being movable to engaged and disengaged positions for controlling the operation of said lock up clutch; and control valve means in fluid communication with said modulator valve means, said selector valve means and said shift valve means and being operable to supply a fixed disengaging bias pressure to said shift valve means when said selector valve is in a position other than said low range and when said modulator pressure is above a predetermined value and a bias pressure equal to said modulator pressure below the predetermined value, and operable to supply modulated fluid pressure to said shift valve to provide an engaging bias pressure to said shift valve while exhausting the disengaging bias pressure when said selector valve is in said low range.
Claim 6
Dependent Claim
237 words
A control for an engine driven multi-range transmission having a fluid coupling, and a fluid operated selectively operable lock up clutch; said control comprising, a source of fluid pressure; selector valve means in fluid communication with said source for selecting a plurality of drive ranges including a low range, modulator valve means in fluid communication with said source and operatively connected with the engine for generating a variable modulated fluid pressure in response to an operating parameter of the engine; governor means for providing a governor pressure proportional to the output speed of the transmission; shift valve means in fluid communication with said source, said governor means, and said lock up clutch and being movable to engaged and disengaged positions for controlling the operation of said lock up clutch; and control valve means in fluid communication with said modulator valve means, said selector valve means and said shift valve means and being operable to supply a fixed disengaging bias pressure to said shift valve means when said selector valve is in a position other than said low range and when said modulator pressure is above a predetermined value and a bias pressure equal to said modulator pressure below the predetermined value, and operable to supply modulated fluid pressure to said shift valve to provide an engaging bias pressure to said shift valve while exhausting the disengaging bias pressure when said selector valve is in said low range.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |