US3752009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic transmission and controls
Assignee: Individual
•
Filing: 1971-09-03
•
Granted: 1973-08-14
•
Expires: 1991-09-03
Abstract
Abstract Power transmission having torque converter drivingly connected to a planetary gear unit conditionable by selective engagement of friction drive establishing devices to provide for four forward drives and one reverse drive. A converter clutch normally held from engagement by the feed of fluid into the converter through a clutch control chamber can be engaged by converter pressure in response to an upshift signal and subsequent exhaust of fluid from the control chamber to permit mechanical drive of the gear unit. A shift valve forming part of hydraulic controls provides a signal pressure to open a converter feed restrictor valve to permit the converter to be fed with operating oil through a second feed passage. The signal from this valve also activates an accumulator valve system which controls the engagement of the converter clutch so that converter clutch capacity is gradually increased to a maximum. There is a detent valve which provides for 3-2 and 4-3 part throttle downshifts and 4-2, 3-2 and 2-1 full throttle downshifts.
Inventors
- 👤 H Chana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:55
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/08; F16H47/085
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
476 words
In an automatic shifting transmission having a rotatable input and a rotatable output, a hydrodynamic unit operatively connected to said input, gearing means operatively connecting said hydrodynamic unit and said output, a plurality of hydraulically operated friction drive establishing devices operatively connected to said gearing means and selectively engageable and disengageable for providing a plurality of different input/output speed ratios for the forward drive of a vehicle, hydraulic system means for automatically controlling the apply and release of said friction drive establishing devices and the automatic shifting of said transmission, said hydraulic system means comprising: a source of regulated hydraulic pressure, first and second and third shift valve means each operatively connected to said source and to said friction drive establishing devices and being movable to upshift and downshift positions for effecting the engagement and disengagement of said friction drive establishing devices, first signal means operatively connected to said transmission and hydraulically connected to each said shift valve means exerting a forCe on each said shift valve means directed toward the upshift position of said shift valve means, second signal means reflecting torque demanded of said transmission hydraulically connected to each said shift valve means for exerting a force thereon directed toward the downshift position of each said valve means, said third shift valve means comprising a shifter valve element movable between upshift and downshift positions and further comprising first and second control valve means, said first control valve means having a shiftable valve element and a hydraulic control chamber therein, biasing means for urging said last-mentioned shiftable valve element toward a first position, fluid passage means hydraulically connecting said source to said first control valve means, fluid passage means connecting said control chamber to said second signal means through said shifter valve element only when said shifter valve element is in a downshift position to move said shiftable valve element from said first position so that pressure from said source fed to said first control valve means is directed to said third shift valve means to exert a force on said shifter valve element thereof sufficient to hold said shifter valve element in a downshift position until the force from said second signal means is reduced to a level allowing said biasing means to move said shiftable valve element of said first control valve to a first position to block the feed of pressure fluid from said source to said third shift valve means through said first control valve means to thereby allow said first signal means to move said shifter valve element to an upshift position, and said second control valve means having selectively energizable means to move said valve element of said first control valve means to a position to inhibit the upshift of said shifter valve means for all upshift forces exerted on said shifter valve means by said first signal means.
Claim 2
Dependent Claim
476 words
In an automatic shifting transmission having a rotatable input and a rotatable output, a hydrodynamic unit operatively connected to said input, gearing means operatively connecting said hydrodynamic unit and said output, a plurality of hydraulically operated friction drive establishing devices operatively connected to said gearing means and selectively engageable and disengageable for providing a plurality of different input/output speed ratios for the forward drive of a vehicle, hydraulic system means for automatically controlling the apply and release of said friction drive establishing devices and the automatic shifting of said transmission, said hydraulic system means comprising: a source of regulated hydraulic pressure, first and second and third shift valve means each operatively connected to said source and to said friction drive establishing devices and being movable to upshift and downshift positions for effecting the engagement and disengagement of said friction drive establishing devices, first signal means operatively connected to said transmission and hydraulically connected to each said shift valve means exerting a forCe on each said shift valve means directed toward the upshift position of said shift valve means, second signal means reflecting torque demanded of said transmission hydraulically connected to each said shift valve means for exerting a force thereon directed toward the downshift position of each said valve means, said third shift valve means comprising a shifter valve element movable between upshift and downshift positions and further comprising first and second control valve means, said first control valve means having a shiftable valve element and a hydraulic control chamber therein, biasing means for urging said last-mentioned shiftable valve element toward a first position, fluid passage means hydraulically connecting said source to said first control valve means, fluid passage means connecting said control chamber to said second signal means through said shifter valve element only when said shifter valve element is in a downshift position to move said shiftable valve element from said first position so that pressure from said source fed to said first control valve means is directed to said third shift valve means to exert a force on said shifter valve element thereof sufficient to hold said shifter valve element in a downshift position until the force from said second signal means is reduced to a level allowing said biasing means to move said shiftable valve element of said first control valve to a first position to block the feed of pressure fluid from said source to said third shift valve means through said first control valve means to thereby allow said first signal means to move said shifter valve element to an upshift position, and said second control valve means having selectively energizable means to move said valve element of said first control valve means to a position to inhibit the upshift of said shifter valve means for all upshift forces exerted on said shifter valve means by said first signal means.
Claim 3
Dependent Claim
349 words
In an automatic shifting transmission having a rotatable input and a rotatable output, torque transmitting means including gearing means operatively connecting said input and said output, a plurality of hydraulically operated friction drive establishing devices operatively connected to said gearing means and selectively engageable and disengageable for providing a plurality of different input/output speed ratios for forward drive of a vehicle, hydraulic system means for automatically controlling the apply and release of said friction drive establishing devices and the automatic shifting of said transmission, said hydraulic system means comprising: a source of pressure regulated hydraulic fluid, a plurality of shift valve means operatively connected to said source and to said friction drive establishing devices and being movable to upshift and downshift positions for effecting the engagement and disengagement of said friction drive establishing devices, first signal means operatively connected to said transmission and hydraulically connected to said shift valve means exerting a force thereon directed toward the upshift position of said valve means, second signal means operatively connected to said transmission and hydraulically connected to said shift valve means exerting a force thereon directed toward the downshift position of said valve means, control valve means hydraulically connected to one of said shift valve means, means hydraulically connecting said last mentioned control valve means to said fluid pressure source, said control valve means having a control valve element movable between first and second positions, actuator means for urging said control valve element to said first position, a control chamber operatively connected to said second signal means through said last mentioned shift valve means only when said last mentioned shift valve means is in a downshift position so that pressure from said fluid pressure source is fed to said last mentioned shift valve means to inhibit its upshifting by the force exerted by said first signal means until the forCe exerted by said second signal means is reduced to a predetermined force allowing said actuator means to move said control valve element to said second position blocking the feed of pressure to said last mentioned shift valve from said control valve.
Claim 4
Dependent Claim
349 words
In an automatic shifting transmission having a rotatable input and a rotatable output, torque transmitting means including gearing means operatively connecting said input and said output, a plurality of hydraulically operated friction drive establishing devices operatively connected to said gearing means and selectively engageable and disengageable for providing a plurality of different input/output speed ratios for forward drive of a vehicle, hydraulic system means for automatically controlling the apply and release of said friction drive establishing devices and the automatic shifting of said transmission, said hydraulic system means comprising: a source of pressure regulated hydraulic fluid, a plurality of shift valve means operatively connected to said source and to said friction drive establishing devices and being movable to upshift and downshift positions for effecting the engagement and disengagement of said friction drive establishing devices, first signal means operatively connected to said transmission and hydraulically connected to said shift valve means exerting a force thereon directed toward the upshift position of said valve means, second signal means operatively connected to said transmission and hydraulically connected to said shift valve means exerting a force thereon directed toward the downshift position of said valve means, control valve means hydraulically connected to one of said shift valve means, means hydraulically connecting said last mentioned control valve means to said fluid pressure source, said control valve means having a control valve element movable between first and second positions, actuator means for urging said control valve element to said first position, a control chamber operatively connected to said second signal means through said last mentioned shift valve means only when said last mentioned shift valve means is in a downshift position so that pressure from said fluid pressure source is fed to said last mentioned shift valve means to inhibit its upshifting by the force exerted by said first signal means until the forCe exerted by said second signal means is reduced to a predetermined force allowing said actuator means to move said control valve element to said second position blocking the feed of pressure to said last mentioned shift valve from said control valve.
Claim 5
Dependent Claim
144 words
The transmission defined in claim 2 wherein said hydraulic system means further comprises a second control valve means, means operatively connecting said second control valve means with said first control valve means so that said second control valve means can shift said first control valve means, hydraulic passage means operatively connecting said second control valve means with said source and selectively operable exhaust means operatively connected to said second control valve means to selectively exhaust pressure fluid from said second control valve means to permit pressure from said source to move said first and second control valve means together to positions whereby pressure fluid is fed from said first control valve means to said last mentioned shift valve means to prevent the force exerted by the pressure of said first signal means from moving said last mentioned shift valve means to an upshifted position.
Claim 6
Dependent Claim
285 words
In an automatic shifting transmission having a rotatable input and a rotatable output, torque transmitting means comprising gearing means operatively connecting said input and said output, a plurality of hydraulically operated friction drive establishing devices operatively connected to said gearing means and selectively engageable and disengageable for providing a plurality of different forward drive input/output speed ratios, hydraulic system means for automatically controlling the apply and release of said friction drive establishing devices and the automatic shifting of said transmission, said hydraulic system means comprising a source of pressurized hydraulic fluid, a plurality of shift valve means operatively connected to said source and to said friction drive establishing devices, said shift valve means having valve elements movable to upshift and downshift positions for effecting the engagement and disengagement of said friction drive establishing devices for automatically shifting said gear means between different input/output speed ratios, first signal means operatively connected to said transmission and hydraulically connected to said shift valve means exerting a force thereon directed toward the upshift position, second signal means operatively connected to said transmission and hydraulically connected to said shift valve means exerting a force thereon directed toward the downshift position, control valve means for one of said shift valve means operatively connected to said source of fluid pressure, said control valve means having a valve element shiftable between closed and open positions for controlling the supply of pressure fluid from said source of fluid pressure to said last mentioned shift valve, and a second control valve means movable toward a predetermined position to selectively contact and move said control valve element to said open position to thereby connect said last mentioned shift valve means with said source of fluid pressure.
Claim 7
Dependent Claim
285 words
In an automatic shifting transmission having a rotatable input and a rotatable output, torque transmitting means comprising gearing means operatively connecting said input and said output, a plurality of hydraulically operated friction drive establishing devices operatively connected to said gearing means and selectively engageable and disengageable for providing a plurality of different forward drive input/output speed ratios, hydraulic system means for automatically controlling the apply and release of said friction drive establishing devices and the automatic shifting of said transmission, said hydraulic system means comprising a source of pressurized hydraulic fluid, a plurality of shift valve means operatively connected to said source and to said friction drive establishing devices, said shift valve means having valve elements movable to upshift and downshift positions for effecting the engagement and disengagement of said friction drive establishing devices for automatically shifting said gear means between different input/output speed ratios, first signal means operatively connected to said transmission and hydraulically connected to said shift valve means exerting a force thereon directed toward the upshift position, second signal means operatively connected to said transmission and hydraulically connected to said shift valve means exerting a force thereon directed toward the downshift position, control valve means for one of said shift valve means operatively connected to said source of fluid pressure, said control valve means having a valve element shiftable between closed and open positions for controlling the supply of pressure fluid from said source of fluid pressure to said last mentioned shift valve, and a second control valve means movable toward a predetermined position to selectively contact and move said control valve element to said open position to thereby connect said last mentioned shift valve means with said source of fluid pressure.
Claim 8
Dependent Claim
132 words
The transmission defined in claim 4, said second control valve having a valve element for directly contacting the valve element in said first control valve and having a land which forms first and second pressure chambers, means for connecting said source to said first pressure chamber, a flow control orifice formed in said land connecting said pressure chambers, an exhaust port operatively connected to said second pressure chamber, and closure means to selectively open said exhaust port to permit a buildup in pressure in said first chamber so that said valve element of said second control valve moves to position the first control valve so that pressure from said source means is fed to said last mentioned shift valve means to hold said last mentioned shift valve means in a downshift position.
Claim 9
Dependent Claim
233 words
In a control for a transmission having a Transmission input and an output operatively connected by torque transmitting means including a gear unit selectively conditioned by a plurality of hydraulically operated friction drive establishing devices for a plurality of different input/output speed ratios comprising a source of pressurized fluid, shift valve means operatively connected to said source and to said friction drive establishing devices, first and second signal means operatively connected to said shift valve means, said shift valve means having valve element means movable by the opposing of said signal means between upshift and downshift positions for controlling the engagement and disengagement of said friction drive establishing devices, control valve means for one of said shift valve means operatively connected to said source, a detent valve having a valve element movable to a plurality of positions in accordance with a torque demand signal, said valve element being movable to a predetermined position in which a pressure supplied to said detent valve is routed to said control valve means through said last mentioned shift valve means when in the upshifted position, said control valve having a valve element shiftable in response to the pressure supplied to said control valve from said detent valve to a position opening said source to said shift valve means to cause said shift valve element in said last mentioned shift valve means to move to the downshift position.
Claim 10
Dependent Claim
233 words
In a control for a transmission having a Transmission input and an output operatively connected by torque transmitting means including a gear unit selectively conditioned by a plurality of hydraulically operated friction drive establishing devices for a plurality of different input/output speed ratios comprising a source of pressurized fluid, shift valve means operatively connected to said source and to said friction drive establishing devices, first and second signal means operatively connected to said shift valve means, said shift valve means having valve element means movable by the opposing of said signal means between upshift and downshift positions for controlling the engagement and disengagement of said friction drive establishing devices, control valve means for one of said shift valve means operatively connected to said source, a detent valve having a valve element movable to a plurality of positions in accordance with a torque demand signal, said valve element being movable to a predetermined position in which a pressure supplied to said detent valve is routed to said control valve means through said last mentioned shift valve means when in the upshifted position, said control valve having a valve element shiftable in response to the pressure supplied to said control valve from said detent valve to a position opening said source to said shift valve means to cause said shift valve element in said last mentioned shift valve means to move to the downshift position.
Claim 11
Dependent Claim
235 words
In a control for a transmission having a transmission input and an output operatively connected by a hydrodynamic unit and by a gear unit selectively conditioned by a plurality of hydraulically operated friction drive establishing devices for a plurality of different input/output speed ratios comprising a source of pressurized fluid, shift valve means operatively connected to said source and to said friction drive establishing devices, first and second signal means operatively connected to said shift valve means, said shift valve means having valve element means movable by opposing forces of said signal means on said valve element between upshift and downshift positions for controlling the engagement and disengagement of said friction drive establishing devices, control valve means for one of said shift valve means operatively connected to said source, a detent valve having a valve element movable to a plurality of positions for forcing said transmission to downshift, said detent valve element being movable to one of said positions in which a pressure supplied to said detent valve from said source is routed to said control valve means through said last recited shift valve means when in the upshifted position, said control valve having a valve element shiftable in response to the pressure supplied thereto from said detent valve to a position opening said source to said last recited shift valve means so that said last recited shift valve means moves to the downshift position.
Claim 12
Dependent Claim
235 words
In a control for a transmission having a transmission input and an output operatively connected by a hydrodynamic unit and by a gear unit selectively conditioned by a plurality of hydraulically operated friction drive establishing devices for a plurality of different input/output speed ratios comprising a source of pressurized fluid, shift valve means operatively connected to said source and to said friction drive establishing devices, first and second signal means operatively connected to said shift valve means, said shift valve means having valve element means movable by opposing forces of said signal means on said valve element between upshift and downshift positions for controlling the engagement and disengagement of said friction drive establishing devices, control valve means for one of said shift valve means operatively connected to said source, a detent valve having a valve element movable to a plurality of positions for forcing said transmission to downshift, said detent valve element being movable to one of said positions in which a pressure supplied to said detent valve from said source is routed to said control valve means through said last recited shift valve means when in the upshifted position, said control valve having a valve element shiftable in response to the pressure supplied thereto from said detent valve to a position opening said source to said last recited shift valve means so that said last recited shift valve means moves to the downshift position.
Claim 13
Dependent Claim
80 words
The control defined in claim 7, said shift valve means comprising: first, second and third shift valves for controlling 1-2, 2-3 and 3-4 gear unit speed ratio changes respectively, additional control valve means operatively connected to first and second shift valve respectively, and hydraulic passage means directly connecting said detent valve means to said additional control valve means to provide for 3-2, 3-1 and 4-2 forced downshifts on the positioning of said detent valve element to other of said positions.
Claim 14
Dependent Claim
234 words
In a control for a transmission having a transmission input and a transmission output, a multi-speed gear unit operatively connecting said input to said output, providing at least four forward drive input/output speed ratios, a plurality of hydraulically operated and selectively engageable friction drive establishing devices operatively connected to said gear unit for changing the speed of said transmission output, said control comprising a source of pressurized fluid; 1-2, 2-3 and 3-4 shift valves operatively connected to said source and to said friction drive establishing devices for controlling the engagement thereof, first signal means providing a hydraulic force proportional to the speed of said transmission output for urging each of said shift valve means to an upshift position, second signal means providing a force proportional to torque demand from said transmission for urging each of said shift valve means to a downshift position, a detent valve operatively connected to said source of fluid pressure and to each of said shift valves, said detent valve having a shiftable valve element movable to a first position to force the 2-3 shift valve to downshift when said first signal means would normally force said 2-3 shift valve to an upshift position and movable to a second position to force a 4-3 downshift and movable to a third position to force said 4-3 and said 3-2 shift valves to downshift for a four to two speed ratio shift.
Claim 15
Dependent Claim
234 words
In a control for a transmission having a transmission input and a transmission output, a multi-speed gear unit operatively connecting said input to said output, providing at least four forward drive input/output speed ratios, a plurality of hydraulically operated and selectively engageable friction drive establishing devices operatively connected to said gear unit for changing the speed of said transmission output, said control comprising a source of pressurized fluid; 1-2, 2-3 and 3-4 shift valves operatively connected to said source and to said friction drive establishing devices for controlling the engagement thereof, first signal means providing a hydraulic force proportional to the speed of said transmission output for urging each of said shift valve means to an upshift position, second signal means providing a force proportional to torque demand from said transmission for urging each of said shift valve means to a downshift position, a detent valve operatively connected to said source of fluid pressure and to each of said shift valves, said detent valve having a shiftable valve element movable to a first position to force the 2-3 shift valve to downshift when said first signal means would normally force said 2-3 shift valve to an upshift position and movable to a second position to force a 4-3 downshift and movable to a third position to force said 4-3 and said 3-2 shift valves to downshift for a four to two speed ratio shift.
Claim 16
Dependent Claim
217 words
A control for automatically shifting a multi speed transmission having a transmission input and an output operatively connected to a torque converter and a selectively engageable clutch connected in parallel for selectively driving a gear unit conditioned by a plurality of hydraulically operated friction drive establishing devices for forward low, intermediate, direct, and overdrive input/output speed ratios and for a reverse drive ratio comprising; a source of pressurized fluid, first, second and third shift valve means operatively connected to said source and to said friction drive establishing devices, governor valve means and modulator valve means providing a first and second signal means operatively connected to said shift valve means for upshifting and downshifting said gear unit, selector valve means for selectively conditioning said transmission for low, intermediate, automatic change-speed forward drive and reverse drive, a control valve operatively connected to said source and to one of said shift valves for controlling the clutch parallel to the torque converter, said last mentioned shift valve having valve element means movable by signals from said governor and modulator valve means to actuate said clutch control valve means to effect the disengagement of the clutch for all converter low and intermediate drives and effect the engagement of the clutch for mechanical drive of the gear unit for direct and overdrive operation.
Claim 17
Dependent Claim
217 words
A control for automatically shifting a multi speed transmission having a transmission input and an output operatively connected to a torque converter and a selectively engageable clutch connected in parallel for selectively driving a gear unit conditioned by a plurality of hydraulically operated friction drive establishing devices for forward low, intermediate, direct, and overdrive input/output speed ratios and for a reverse drive ratio comprising; a source of pressurized fluid, first, second and third shift valve means operatively connected to said source and to said friction drive establishing devices, governor valve means and modulator valve means providing a first and second signal means operatively connected to said shift valve means for upshifting and downshifting said gear unit, selector valve means for selectively conditioning said transmission for low, intermediate, automatic change-speed forward drive and reverse drive, a control valve operatively connected to said source and to one of said shift valves for controlling the clutch parallel to the torque converter, said last mentioned shift valve having valve element means movable by signals from said governor and modulator valve means to actuate said clutch control valve means to effect the disengagement of the clutch for all converter low and intermediate drives and effect the engagement of the clutch for mechanical drive of the gear unit for direct and overdrive operation.
Claim 18
Dependent Claim
233 words
A hydraulic control for a geared change-speed transmission comprising a source of fluid pressure, shift valve means for changing the speed ratio of said transmission, means hydraulically connecting said shift valve means to said source of fluid pressure and to said transmission, said shift valve means having a valve element movable between upshift and downshift positions, control valve means hydraulically connected to said source of fluid pressure, first fluid passage means hydraulically connecting said control valve means to said shift valve means, a detent valve, means hydraulically connecting said detent valve to said source, second fluid passage means hydraulically connecting said detent valve to said shift valve means, third fluid passage means hydraulically connecting said shift valve means to said control valve means, said detent valve having a valve element movable to a position whereby fluid pressure from said source is fed through said detent valve and said second passage means into said shift valve only when said valve element of said shift valve means is in an upshift position and through said third fluid passage means into said control valve means to thereby shift said control valve means to a predetermined position in which pressure fluid from said source is fed through said control valve means and said first fluid passage means to said shift valve means to move said shift valve element to a downshift position to thereby downshift said transmission.
Claim 19
Dependent Claim
233 words
A hydraulic control for a geared change-speed transmission comprising a source of fluid pressure, shift valve means for changing the speed ratio of said transmission, means hydraulically connecting said shift valve means to said source of fluid pressure and to said transmission, said shift valve means having a valve element movable between upshift and downshift positions, control valve means hydraulically connected to said source of fluid pressure, first fluid passage means hydraulically connecting said control valve means to said shift valve means, a detent valve, means hydraulically connecting said detent valve to said source, second fluid passage means hydraulically connecting said detent valve to said shift valve means, third fluid passage means hydraulically connecting said shift valve means to said control valve means, said detent valve having a valve element movable to a position whereby fluid pressure from said source is fed through said detent valve and said second passage means into said shift valve only when said valve element of said shift valve means is in an upshift position and through said third fluid passage means into said control valve means to thereby shift said control valve means to a predetermined position in which pressure fluid from said source is fed through said control valve means and said first fluid passage means to said shift valve means to move said shift valve element to a downshift position to thereby downshift said transmission.
Claim 20
Dependent Claim
199 words
The control designed in claim 11 wherein said control valve means comprises first and seconD shiftable control valve elements, means operatively connecting said first and second control valve elements so that said first control valve element can shift said second control valve element, said control valve means having a first chamber formed on one side of said first control valve element, means operatively connecting said first fluid chamber with said source of fluid pressure, a second control chamber formed on the other side of said first control valve element, fluid flow control means interconnecting said first and second chambers, exhaust valve means for exhausting fluid from said second control chamber so that pressure from said source acting on said first control valve element will urge said control valve elements to a position whereby pressure from said source fed through said second control valve to said shift valve downshifts said transmission, and means for closing said exhaust valve means whereby pressure in said second control chamber moves said first control valve element from said second control valve element so that said second control valve element can be shifted to effect the upshift of said shift valve element and said transmission.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |