Patent US3667322A successfully refreshed from Google Patents.
US3667322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil pressure controlling device for automatic transmission with hydraulic torque converter
Assignee: Denso Corp
•
Filing: 1970-07-09
•
Granted: 1972-06-06
•
Expires: 1990-07-09
Abstract
Abstract An oil pressure control system is provided in relation to an automatic transmission for vehicles composed of a hydraulic torque converter pump, a hydraulic torque converter turbine, a gear transmission unit incorporating gears and frictionally engaging means, and an oil pressure operating circuit for controlling the engagement and disengagement of the aforesaid frictionally engaging means, said circuit incorporating a constant pressure valve for maintaining the operation oil pressure in such circuit at a predetermined value, an electronically controlled actuator, and an actuating valve for changing the predetermined value of the constant pressure valve by energizing or de-energizing the actuator. A computer circuit is provided for controlling the activation of said actuator through the medium of delivery thereto of, respectively, a signal in accordance with the number of revolutions of the output shaft of the gear transmission and a signal in accordance with the number of revolutions of the hydraulic torque converter turbine shaft.
Inventors
- 👤 Masaaki Noguchi
- 👤 Masaharu Sumiyoshi
- 👤 Shigeru Sakakibara
- 👤 Osamu Ito
- 👤 Takaaki Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:10
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
210 words
An operation oil pressure controlling device for preventing shift shock upon movement of the shift lever of the transmission in an automotive vehicle wherein said automatic transmission incorporates a hydraulic torque converter pump, a hydraulic torque converter turbine operatively coupled to said hydraulic torque converter pump, a gear transmission including gears and frictionally engaging means, a first output shaft leading from said turbine to said gear transmission, a second output shaft leading from said gear transmission, and an oil pressure operating circuit for controlling the engagement and disengagement of said frictionally engaging means; said operation oil pressure controlling device comprising a constant pressure valve for maintaining the oil pressure of said oil pressure operating circuit at a predetermined value, an actuator, a control valve operatively coupleD to said constant pressure valve for lowering the predetermined value of the oil pressure developed by the constant pressure valve upon activation of said actuator, speed responsive signal generator means operatively coupled to each of said first and second output shafts, and means for operating said actuator in response to said speed responsive signals in accordance with the speed of said first and second output shafts, whereby upon activation of said actuator, the operation oil pressure applied to the frictionally engaging means is lowered.
Claim 2
Dependent Claim
210 words
An operation oil pressure controlling device for preventing shift shock upon movement of the shift lever of the transmission in an automotive vehicle wherein said automatic transmission incorporates a hydraulic torque converter pump, a hydraulic torque converter turbine operatively coupled to said hydraulic torque converter pump, a gear transmission including gears and frictionally engaging means, a first output shaft leading from said turbine to said gear transmission, a second output shaft leading from said gear transmission, and an oil pressure operating circuit for controlling the engagement and disengagement of said frictionally engaging means; said operation oil pressure controlling device comprising a constant pressure valve for maintaining the oil pressure of said oil pressure operating circuit at a predetermined value, an actuator, a control valve operatively coupleD to said constant pressure valve for lowering the predetermined value of the oil pressure developed by the constant pressure valve upon activation of said actuator, speed responsive signal generator means operatively coupled to each of said first and second output shafts, and means for operating said actuator in response to said speed responsive signals in accordance with the speed of said first and second output shafts, whereby upon activation of said actuator, the operation oil pressure applied to the frictionally engaging means is lowered.
Claim 3
Dependent Claim
35 words
An operation oil pressure controlling device, in accordance with claim 1, wherein the actuator is electrically activated and wherein electrically controlled means are provided for activating said actuator in response to said speed responsive signals.
Claim 4
Dependent Claim
17 words
An operation oil pressure controlling device, in accordance with claim 2, wherein the actuator is a solenoid.
Claim 5
Dependent Claim
61 words
An operation oil pressure controlling device, in accordance with claim 2, wherein the means for activating said actuator comprises a computer for transmitting to the actuator electronic signals in accordance respectively with the number of revolutions of said second output shaft of the gear transmission and the number of revolutions of said first output shaft of the hydraulic torque converter turbine.
Claim 6
Dependent Claim
61 words
An operation oil pressure controlling device, in accordance with claim 3, wherein the means for activating said actuator energizes said actuator by transmission of electrical signals to said solenoid in accordance with the number of revolutions of said second output shaft of the gear transmission and the number of revolutions of said first output shaft of the hydraulic torque converter turbine.
Claim 7
Dependent Claim
46 words
An operation oil pressure controlling device, in accordance with claim 1, wherein the actuator is activated and de-activated by the operating means therefor, and whereby upon de-activation of said actuator the operation oil pressure applied to the frictionally engaging means rises back to said predetermined value.
Claim 8
Dependent Claim
83 words
An operation oil pressure controlling device, in accordance with claim 1, wherein said operating means is adapted to activate said actuator in response to speed responsive signals representative of both the speed of said first output shaft being of a value greater than a second predetermined value lying in the range from 0 to 100 rpm and the speed of said second output shaft being of a value less than a second predetermined value lying in the range between 0 and 50 rpm.
Claim 9
Dependent Claim
20 words
An operation oil pressure controlling device, in accordance with claim 7, wherein said first predetermined value is about 20 rpm.
Claim 10
Dependent Claim
19 words
An operation oil pressure controlling device, in accordance withclaim 7, wherein said second predetermined value is about 20 rpm.
References Cited (Backward Citations)
US3293935A
Cited
US2711656A
Cited
US2756851A
Cited
US3019668A
Cited
US3330170A
Cited
US3416393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |