US3672243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure control mechanism
Assignee: Aisin Corp
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Filing: 1970-06-01
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Granted: 1972-06-27
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Expires: 1990-06-01
Abstract
Abstract In a fluid operated speed change mechanism the hydraulic pressure from a supply source is subjected to a pressure adjustment by a suitable control valve and is selectively supplied to a fluid motor which controls the engagement of a brake band in the planetary gearing. The reaction force caused by engagement of the brake band is transmitted mechanically or fluidically to the pressure adjusting control valve in a manner to increase the fluid pressure being supplied to the fluid motor thereby increasing the braking force of the brake band to prevent undue slippage. When the brake band is not applied, no reaction force can be transmitted to the control valve and the control valve will function in the normal manner.
Inventors
- 👤 Noboru Murakami
- 👤 Koichiro Hirozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:38
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/0021
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
A pressure control device for a hydraulic fluid operated speed change mechanism utilizing a transmission gear set and various friction engaging devices for effectuating various gear ratio linkages in a power train comprising: a reservoir for the hydraulic fluid; a pump connected to the reservoir; control means for regulating the desired gear ratio linkages and receiving hydraulic fluid under pressure from the pump; at least one hydraulic force device connected to the control means for actuating a friction engaging device; a reaction member means connected to the friction device for producing a signal proportional to the reaction force generated by the engagement of the friction engaging device, and pressure adjusting valve means for regulating the pressurized hydraulic fluid supplied to the control means in response to the signal generated by the reaction member means by metering the hydraulic fluid to the reservoir, whereby sudden shocks from insufficient or excessive torque to the friction engaging devices are prevented.
Claim 2
Dependent Claim
157 words
A pressure control device for a hydraulic fluid operated speed change mechanism utilizing a transmission gear set and various friction engaging devices for effectuating various gear ratio linkages in a power train comprising: a reservoir for the hydraulic fluid; a pump connected to the reservoir; control means for regulating the desired gear ratio linkages and receiving hydraulic fluid under pressure from the pump; at least one hydraulic force device connected to the control means for actuating a friction engaging device; a reaction member means connected to the friction device for producing a signal proportional to the reaction force generated by the engagement of the friction engaging device, and pressure adjusting valve means for regulating the pressurized hydraulic fluid supplied to the control means in response to the signal generated by the reaction member means by metering the hydraulic fluid to the reservoir, whereby sudden shocks from insufficient or excessive torque to the friction engaging devices are prevented.
Claim 3
Dependent Claim
69 words
A pressure control device as in claim 1, where the pressure adjusting valve means includes a valve spool and a cylinder, one side of the valve spool connected to the hydraulic force device for generating one force, while the other side is connected to the reaction member means for generating an opposing force, whereby the resultant of the forces controls the metering of the hydraulic fluid to the reservoir.
Claim 4
Dependent Claim
82 words
A pressure control device as in claim 1, where the reaction member means includes a strut and a camming lever for transmitting a force to the pressure adjusting valve means, the pressure adjusting valve means further including a cylinder, a metering valve spool mounted in the cylinder and a conduit having a restrictive orifice for supplying metered hydraulic fluid to the same side of the valve spool as the camming lever force whereby oscillations of the metering valve spool will be damped.
Claim 5
Dependent Claim
135 words
A fluid operated speed changer for a vehicle comprising: a planetary gearing means for providing speed reductions; a reservoir of hydraulic fluid; a pump means connected to the reservoir; a pressure regulator valve means for distributing hydraulic fluid from the pump means, and engagement control means for controlling the actuation of The planetary gearing means including an input means, a reaction means, and a fluid pressure control means provided between said input and reaction means for connecting said pressure regulator valve so as to actuate said reaction means in the pressure increasing direction of said pressure regulator valve in case of energization of said input means, and for interrupting the cooperating conditions of said reaction means and said pressure regulator valve in case of failure of fluid pressure to be conveyed to said input means.
Claim 6
Dependent Claim
135 words
A fluid operated speed changer for a vehicle comprising: a planetary gearing means for providing speed reductions; a reservoir of hydraulic fluid; a pump means connected to the reservoir; a pressure regulator valve means for distributing hydraulic fluid from the pump means, and engagement control means for controlling the actuation of The planetary gearing means including an input means, a reaction means, and a fluid pressure control means provided between said input and reaction means for connecting said pressure regulator valve so as to actuate said reaction means in the pressure increasing direction of said pressure regulator valve in case of energization of said input means, and for interrupting the cooperating conditions of said reaction means and said pressure regulator valve in case of failure of fluid pressure to be conveyed to said input means.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |