US3625322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction coupling controlled by vehicle speed and manifold vacuum
Assignee: Mazda Motor Corp
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Filing: 1969-10-30
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Granted: 1971-12-07
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Expires: 1989-10-30
Abstract
Abstract The control system for an automatic transmission controls the flow of fluid to a friction clutch or brake to establish various drive gear ratios of a transmission including a friction-engaging mechanism to complete a power train between said shafts. A source of fluid for supplying a line pressure to said friction-engaging mechanism is provided. A vacuum motor is connected to the intake manifold of an engine. A regulator valve is disposed between the source of fluid and the friction-engaging mechanism to regulate the line pressure from the source. Valve means connected to said vacuum motor increase the line pressure in response to the decrease of the vacuum in the intake manifold by contacting with the regulator valve when said vacuum is below a predetermined value to hold the line pressure higher than the minimum value. When said vacuum is above a predetermined value, said value means releases itself from the regulator valve and at the same time communicates line pressure to a valve land area on the regulator valve to increase the force acting on said regulator valve and hold the line pressure higher than the minumum valve. A pressure area of the regulator valve is coupled to the source of fluid through a restriction, and a speed-responsive device connects the pressure area to a sump or exhaust to reduce the line pressure above a predetermined speed for either of said shafts.
Inventors
- 👤 Hiroaki Nagamatsu
- 👤 Katsuhiro Handa
- 👤 Tetsuo Shimosaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:06
CPC Classifications
F; F16; F16H; F16H59/00; F16H59/14; F16H59/26; F16H59/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
298 words
A control system for an automatic transmission having a drive shaft, a driven shaft, and means including at least one frictionengaging mechanism to complete a power train between said shafts, said control system comprising, a fluid pressure source for supplying a line pressure to said friction-engaging mechanism, a regulator valve for regulating the line pressure from said fluid pressure source, said regulator valve including a plurality of fluid pressure areas formed thereon, a first conduit connecting the output of said fluid pressure source with a first pressure area on said regulator valve, a second conduit connecting the output of said fluid pressure source with a second pressure area on said regulator valve of increasing the regulated line pressure in said first conduit, said second conduit having an orifice restriction formed therein, a third conduit connecting said first pressure area on said regulator valve with said friction-engaging mechanism for actuation thereof, a switching valve operatively connected to said driven shaft, said switching valve having a piston movably contained within a bore formed in a housing, said housing adapted for rotation by said driven shaft to cause said piston to be moved radially outwardly by centrifugal force, a biasing means positioned between said housing and said piston to bias said piston radially inwardly in opposition to the centrifugal forces acting thereon, said housing having a first and a second oil passage formed therein, said first passage communicating with said second pressure area on said regulator valve, said second passage forming an oil exhaust port, said piston being moved radially outwardly in response to the rotation of said driven shaft to connect said first port with said second port to reduce the line pressure supplied to said friction engaging mechanism when the speed of said driven shaft exceeds a predetermined value.
Claim 2
Dependent Claim
298 words
A control system for an automatic transmission having a drive shaft, a driven shaft, and means including at least one frictionengaging mechanism to complete a power train between said shafts, said control system comprising, a fluid pressure source for supplying a line pressure to said friction-engaging mechanism, a regulator valve for regulating the line pressure from said fluid pressure source, said regulator valve including a plurality of fluid pressure areas formed thereon, a first conduit connecting the output of said fluid pressure source with a first pressure area on said regulator valve, a second conduit connecting the output of said fluid pressure source with a second pressure area on said regulator valve of increasing the regulated line pressure in said first conduit, said second conduit having an orifice restriction formed therein, a third conduit connecting said first pressure area on said regulator valve with said friction-engaging mechanism for actuation thereof, a switching valve operatively connected to said driven shaft, said switching valve having a piston movably contained within a bore formed in a housing, said housing adapted for rotation by said driven shaft to cause said piston to be moved radially outwardly by centrifugal force, a biasing means positioned between said housing and said piston to bias said piston radially inwardly in opposition to the centrifugal forces acting thereon, said housing having a first and a second oil passage formed therein, said first passage communicating with said second pressure area on said regulator valve, said second passage forming an oil exhaust port, said piston being moved radially outwardly in response to the rotation of said driven shaft to connect said first port with said second port to reduce the line pressure supplied to said friction engaging mechanism when the speed of said driven shaft exceeds a predetermined value.
Claim 3
Dependent Claim
117 words
A control system as claimed in claim 1, wherein said piston of said switching valve has a first position within a predetermined range of centrifugal forces acting thereon for blocking communication of said first passage with said second passage, and movable to a second position above a predetermined value of said centrifugal forces to connect said first passage with said second passage, whereby the line pressure is maintained at a predetermined maximum value when said piston is in said first position and at a predetermined minimum value when said piston is moved to said second position, wherein the line pressure supplied to said friction engaging mechanism is reduced in a stepped mannEr above a predetermined shaft speed.
Claim 4
Dependent Claim
224 words
A control system for an automatic transmission as claimed in claim 1, further comprising, a vacuum motor connected with an intake manifold of an engine, said vacuum motor having a reciprocable rod actuated in response to the vacuum of said intake manifold, a compensating valve disposed in said third conduit, said compensating valve including a valve disposed in said third conduit, said compensating valve including a valve piston adapted to move in accordance with the movement of said reciprocable rod to selectively block or permit pressure distribution of said line pressure to a third pressure area on said regulator valve, said valve piston having one end in contact with said regulator valve to urge said regulator valve in the direction opposite to the pressure force acting on said first pressure area when the vacuum in said intake manifold is below a predetermined value, and being adapted to move out of contact with said regulator valve to vary the value of pressure supplied to said third pressure area when the vacuum in said intake manifold increases above a predetermined value, whereby, said line pressure decreases to a minimum value according to the increase of said intake manifold vacuum when said vacuum is below a predetermined value and is maintained at a pressure higher than said minimum value when said vacuum is above a predetermined value.
Claim 5
Dependent Claim
50 words
A control system for an automatic transmission as claimed in claim 3, wherein said valve piston has an extension formed on one end thereof in contact with said regulator valve, and having a spring adapted to bias said valve piston into contact with said reciprocable rod of said vacuum motor.
Claim 6
Dependent Claim
42 words
A control system for an automatic transmission as claimed in claim 1, wherein said regulator valve includes a spring-biasing means for applying a biasing force to said regulator valve in a direction opposite the hydraulic force acting on said first pressure area.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |