US3680398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque converter power transmission having regulating valve means
Assignee: Twin Disc Inc
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Filing: 1971-08-13
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Granted: 1972-08-01
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Expires: 1991-08-13
Abstract
Abstract A power transmission having a torque converter which is driven from a hydraulically actuated, modulatable friction clutch, and a fluid power control system for such a transmission and which prevents the impeller of the torque converter from turning over backwards when the direction of travel of the vehicle is reversed. The control system includes control valve mechanism which insures that a minimum pressure will be acting on the impeller during the direction reversing shift to thereby prevent the impeller from being rotated backwards.
Inventors
- 👤 Raymond C Schneider
- 👤 Robert W Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:57
CPC Classifications
F; F16; F16H; F16H45/00; F16H2045/002; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19149; Y10T74/19158; Y10T74/19163
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
222 words
A power transmission having a rotating housing-type torque converter, a hydraulically-actuated clutch means within the rotating housing and downstream of the housing in respect to the direction of power flow for controlling the operation of said converter, an output member, and gear change mechanism driven by said output member and having hydraulically-actuated forward and reverse clutches; a hydraulic circuit for said transmission and comprising, a control valve for controlling the pressure fluid admitted to said clutch means, a source of high pressure fluid in said circuit for supplying pressure fluid to said control valve, a high-pressure regulating valve in fluid-receiving communication with said source of high-pressure fluid and in fluid-delivering communication with said torque converter, a forward-reverse selector valve having outlets selectively connectable to said forward and reverse clutches of said gear change transmission for selecting the direction of power output of said transmission, said selector valve having said outlets connected directly to said regulating valve, said regulating valve having a fluid communication with said clutch means for regulating the amount of pressure fluid delivered to said clutch means whereby when said selector valve is operated to change the direction of the power output, the pressure in one of said outlets is changed whereby said regulating valve automatically maintains a reduced predetermined fluid pressure in said clutch means during said directIon shift.
Claim 2
Dependent Claim
222 words
A power transmission having a rotating housing-type torque converter, a hydraulically-actuated clutch means within the rotating housing and downstream of the housing in respect to the direction of power flow for controlling the operation of said converter, an output member, and gear change mechanism driven by said output member and having hydraulically-actuated forward and reverse clutches; a hydraulic circuit for said transmission and comprising, a control valve for controlling the pressure fluid admitted to said clutch means, a source of high pressure fluid in said circuit for supplying pressure fluid to said control valve, a high-pressure regulating valve in fluid-receiving communication with said source of high-pressure fluid and in fluid-delivering communication with said torque converter, a forward-reverse selector valve having outlets selectively connectable to said forward and reverse clutches of said gear change transmission for selecting the direction of power output of said transmission, said selector valve having said outlets connected directly to said regulating valve, said regulating valve having a fluid communication with said clutch means for regulating the amount of pressure fluid delivered to said clutch means whereby when said selector valve is operated to change the direction of the power output, the pressure in one of said outlets is changed whereby said regulating valve automatically maintains a reduced predetermined fluid pressure in said clutch means during said directIon shift.
Claim 3
Dependent Claim
33 words
The transmission set forth in claim 1 further characterized in that said fluid communication between said selector valve and said regulating valve includes a one-way check valve in parallel with a restricted orifice.
Claim 4
Dependent Claim
238 words
A vehicle power transmission having a torque converter, a rotatable housing for said converter, a hydraulically-actuated modulatable clutch means in said housing and downstream of said housing in respect to the direction of power flow for controlling the operation of said converter, an output member, and gear change mechanism driven by said output member and having hydraulically-actuated forward and reverse clutches; a hydraulic circuit for said transmission and comprising, a control valve in said housing for controlling the pressure fluid admitted to said clutch means for modulation thereof, a source of high-pressure fluid in said circuit for supplying pressure fluid to said control valve, a manually-operated modulating valve in fluid-delivering communication with said control valve and in fluid-receiving communication with said source of pressure fluid, a high-pressure regulating valve in fluid-receiving communication with said source of high-pressure fluid and in fluid-delivering communication with said torque converter, a forward-reverse selector valve for said forward and reverse clutches of said gear change mechanism for selecting the direction of travel of said vehicle, said selector valve having a fluid-delivering communication with said regulating valve, said regulating valve having a fluid communication with said clutch means for regulating the amount of pressure fluid delivered to said clutch means, whereby when said selector valve is operated to change the direction of travel of said vehicle, said regulating valve automatically maintains a reduced predetermined fluid pressure in said clutch means during said direction shift.
Claim 5
Dependent Claim
238 words
A vehicle power transmission having a torque converter, a rotatable housing for said converter, a hydraulically-actuated modulatable clutch means in said housing and downstream of said housing in respect to the direction of power flow for controlling the operation of said converter, an output member, and gear change mechanism driven by said output member and having hydraulically-actuated forward and reverse clutches; a hydraulic circuit for said transmission and comprising, a control valve in said housing for controlling the pressure fluid admitted to said clutch means for modulation thereof, a source of high-pressure fluid in said circuit for supplying pressure fluid to said control valve, a manually-operated modulating valve in fluid-delivering communication with said control valve and in fluid-receiving communication with said source of pressure fluid, a high-pressure regulating valve in fluid-receiving communication with said source of high-pressure fluid and in fluid-delivering communication with said torque converter, a forward-reverse selector valve for said forward and reverse clutches of said gear change mechanism for selecting the direction of travel of said vehicle, said selector valve having a fluid-delivering communication with said regulating valve, said regulating valve having a fluid communication with said clutch means for regulating the amount of pressure fluid delivered to said clutch means, whereby when said selector valve is operated to change the direction of travel of said vehicle, said regulating valve automatically maintains a reduced predetermined fluid pressure in said clutch means during said direction shift.
Claim 6
Dependent Claim
33 words
The transmission set forth in claim 3 further characterized in that said fluid communication between said selector valve and said regulating valve includes a one-way check valve in parallel with a restricted orifice.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |