US3774629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kickdown unit for an automotive automatic power transmission
Assignee: Nissan Motor Co Ltd
•
Filing: 1971-12-14
•
Granted: 1973-11-27
•
Expires: 1991-12-14
Abstract
Abstract A kickdown unit for effecting a forced downshift in an automotive automatic power transmission, which kickdown unit comprises a valve body, a valve chamber formed in the valve body, a valve spool slidably disposed in the valve chamber and having a relatively large valve land and a relatively small valve land biasing means for urging the valve spool in one direction, inlet and outlet ports communicating with the valve chamber, a control pressure port communicating with the valve chamber at a position to cause the control pressure therein to continuously act on the relatively large valve land for thereby urging the valve spool in another direction, a drain port communicating with said valve chamber and the degree of communication therebetween being controlled by said relatively large valve land and a nozzle leading from the valve chamber, said nozzle being opened and closed for controlling the control pressure acting on the relatively large valve land.
Inventors
- 👤 K Enomoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:18
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0251; F16H59/00; F16H59/14; F16H59/18; F16H59/20; F16H2061/026; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
179 words
A kickdown unit for an automotive automatic power transmission, comprising a valve body, a valve chamber formed in said valve body, a valve spool slidably disposed in said valve chamber and having a relatively large valve land and relatively small valve land, biasing means for biasing said valve spool in one direction, an inlet port formed in said valve body and communicating with said valve chamber, an outlet port formed in said valve body and communicating with said valve chamber, a control pressure port communicating with said valve chamber at a position to cause a control pressure therein to continuously act on said large valve land for thereby biasing said valve spool in aNother direction against the force of said biasing means, a drain port communicating with said valve chamber and the degree of communication therebetween being controlled by said relatively large valve land for thereby varying an output pressure appearing at said outlet port, and a nozzle leading from said valve chamber, said nozzle being opened and closed for controlling said control pressure acting on said large valveland.
Claim 2
Dependent Claim
179 words
A kickdown unit for an automotive automatic power transmission, comprising a valve body, a valve chamber formed in said valve body, a valve spool slidably disposed in said valve chamber and having a relatively large valve land and relatively small valve land, biasing means for biasing said valve spool in one direction, an inlet port formed in said valve body and communicating with said valve chamber, an outlet port formed in said valve body and communicating with said valve chamber, a control pressure port communicating with said valve chamber at a position to cause a control pressure therein to continuously act on said large valve land for thereby biasing said valve spool in aNother direction against the force of said biasing means, a drain port communicating with said valve chamber and the degree of communication therebetween being controlled by said relatively large valve land for thereby varying an output pressure appearing at said outlet port, and a nozzle leading from said valve chamber, said nozzle being opened and closed for controlling said control pressure acting on said large valveland.
Claim 3
Dependent Claim
29 words
A kickdown unit according to claim 1, further comprising an actuator having a plunger associated with said nozzle to vary said control pressure exerted on said large valve land.
Claim 4
Dependent Claim
14 words
A kickdown unit according to claim 2, wherein said biasing means is a spring.
Claim 5
Dependent Claim
17 words
A kickdown unit according to claim 3, wherein said control pressure port communicates with said outlet port.
Claim 6
Dependent Claim
57 words
A kickdown unit according to claim 1, further comprising an auxiliary inlet port communicating with said inlet port and an auxiliary outlet port communicating with said outlet port, and wherein said valve spool further includes an auxiliary valve land between said small and large valve lands to control fluid communication between said auxiliary inlet and outlet ports.
Claim 7
Dependent Claim
23 words
A kickdown unit according to claim 5, wherein said control pressure port communicates with said auxiliary outlet port communicating with said outlet port.
Claim 8
Dependent Claim
14 words
A kickdown unit according to claim 5, wherein said biasing means is a spring.
Claim 9
Dependent Claim
24 words
A kickdown unit according to claim 7, further comprising an actuator having a plunger associated with said nozzle to open and close said nozzle.
Claim 10
Dependent Claim
19 words
A kickdown unit according to claim 8, wherein said nozzle leads from said valve chamber through said drain port.
Claim 11
Dependent Claim
42 words
A kickdown unit according to claim 1, further comprising an additional inlet port, said small valve land controlling fluid communication between said additional inlet port and outlet port whereas said large valve land controls fluid communication between said inlet and outlet ports.
Claim 12
Dependent Claim
24 words
A kickdown unit according to claim 10, further comprising an actuator having a plunger associated with said nozzle to open and close said nozzle.
Claim 13
Dependent Claim
17 words
A kickdown unit according to claim 11, wherein said inlet port communicated with said control pressure port.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |