US3765273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum modulator control for automatic automobile transmission
Assignee: RE KASE Inc
•
Filing: 1972-11-28
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Granted: 1973-10-16
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Expires: 1992-11-28
Abstract
Abstract A system for controlling the vacuum applied to the vacuum modulator valve in an automatic automobile transmission so that maximum security against clutch slippage will occur during acceleration, and ease of shifting to lower gear can occur during deceleration.
Inventors
- 👤 R Re
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:33
CPC Classifications
F; F16; F16H; F16H59/00; F16H59/14; F16H59/26; F16H59/30; F16H61/00; F16H61/02; F16H61/0262; F16H61/0276; F16H61/029
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
In a two-speed automatic transmission for automobiles in which a hydraulic fluid under pressure in a system of conduits, valves, and pressure regulating devices causes the transmission gears to shift from low to high to low in response to acceleration and deceleration of the automobile, wherein the pressure of the hydraulic fluid is responsive to the intermittent application of vacuum through a vacuum modulator valve, whereby during acceleration of the automobile vacuum is not applied permitting full pressure of the hydraulic fluid to be applied to the clutch connecting the gear to the drive shaft of the automobile, and alternatively, during deceleration of the car vacuum is applied causing a lower pressure on the hydraulic fluid which in turn permits automatic shifting to a lower gear; the improvement which comprises a valve located in the vacuum line between the vacuum source and the vacuum modulator valve operatively connected to the throttle in such a fashion that as the throttle is advanced the said valve gradually closes the vacuum line and as the throttle is retarded said valve gradually opens the vacuum line.
Claim 2
Dependent Claim
182 words
In a two-speed automatic transmission for automobiles in which a hydraulic fluid under pressure in a system of conduits, valves, and pressure regulating devices causes the transmission gears to shift from low to high to low in response to acceleration and deceleration of the automobile, wherein the pressure of the hydraulic fluid is responsive to the intermittent application of vacuum through a vacuum modulator valve, whereby during acceleration of the automobile vacuum is not applied permitting full pressure of the hydraulic fluid to be applied to the clutch connecting the gear to the drive shaft of the automobile, and alternatively, during deceleration of the car vacuum is applied causing a lower pressure on the hydraulic fluid which in turn permits automatic shifting to a lower gear; the improvement which comprises a valve located in the vacuum line between the vacuum source and the vacuum modulator valve operatively connected to the throttle in such a fashion that as the throttle is advanced the said valve gradually closes the vacuum line and as the throttle is retarded said valve gradually opens the vacuum line.
Claim 3
Dependent Claim
86 words
The transmission system of claim 1 wherein said valve comprises a piston and a cylinder operatively connected so as to permit axial movement of the piston in the cylinder, inlet and outlet vacuum ports through the wall of said cylinder in the same radial plane, and a circumferential groove around said piston such that said ports communicate with each other via said groove at one axial position of said piston and do not communicate with each other when said piston is moved to another axial position.
Claim 4
Dependent Claim
68 words
The system of claim 2 wherein said cylinder has a closed end containing a spring applying force against one end of said piston, and the other end of said piston is fitted with a striker plate adjustable axially and provided with stop means whereby movement of the piston against said spring is stopped at the point where said groove is aligned with said inlet and outlet vacuum ports.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |