Patent US4895552A successfully refreshed from Google Patents.
US4895552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for transmission
Assignee: Nissan Motor Co Ltd
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Filing: 1989-03-31
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Granted: 1990-01-23
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Expires: 2009-03-31
Abstract
Abstract A control system for a transmission is disclosed. The control system includes a high clutch and a low clutch. When the high clutch is engaged, the torque transmission path through a V-belt type continuously variable transmission mechanism is established, while when the low clutch is engaged, the torque transmission path through a gearing mechanism is established. The same hydraulic fluid pressure as prevailing in a driver pulley cylinder chamber is admitted to the high clutch directly or via a suitable selector valve (a neutral valve).
Inventors
- 👤 Keiju Abo
- 👤 Toshikazu Oshidari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:50
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/66; F16H61/662; F16H61/66254; F16H61/66259; F16H37/00; F16H37/02; F16H37/021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
130 words
A control system for a transmission, the transmission including a gearing mechanism combined with a V-belt type continuously variable transmission mechanism, the transmission also including a low clutch and a high clutch, wherein when the low clutch is engaged, torque is transmitted by the gearing mechanism, while when the high clutch is engaged, torque is transmitted by the V-belt type continuously variable transmission mechanism, the V-belt type continuously variable transmission mechanism including a driver pulley with a driver pulley cylinder chamber, a follower pulley with a follower pulley cylinder chamber, and a V-belt drivingly interconnecting the driver and follower pulleys, the control system, comprising: means for supplying a predetermined hydraulic fluid pressure to the driver pulley cylinder chamber; and means for admitting said predetermined hydraulic pressure to the high clutch.
Claim 2
Dependent Claim
130 words
A control system for a transmission, the transmission including a gearing mechanism combined with a V-belt type continuously variable transmission mechanism, the transmission also including a low clutch and a high clutch, wherein when the low clutch is engaged, torque is transmitted by the gearing mechanism, while when the high clutch is engaged, torque is transmitted by the V-belt type continuously variable transmission mechanism, the V-belt type continuously variable transmission mechanism including a driver pulley with a driver pulley cylinder chamber, a follower pulley with a follower pulley cylinder chamber, and a V-belt drivingly interconnecting the driver and follower pulleys, the control system, comprising: means for supplying a predetermined hydraulic fluid pressure to the driver pulley cylinder chamber; and means for admitting said predetermined hydraulic pressure to the high clutch.
Claim 3
Dependent Claim
50 words
A control system as claimed in claim 1, including means for supplying a hydraulic fluid pressure to the low clutch when a predetermined member has moved to an overstroke position beyond a predetermined position coresponding to the maximum reduction ratio to be provided by the V-belt type continuously variable transmission.
Claim 4
Dependent Claim
34 words
A control system as claimed in claim 1, wherein said admitting means includes valve means for draining hydraulic fluid from the high clutch upon selecting a range position other than a predetermined range position.
References Cited (Backward Citations)
JPS53137375A
Cited
JPS5697661A
Cited
JPS57191134A
Cited
US4548100A
Cited
JPS58146756A
Cited
US4610183A
Cited
JPS60249758A
Cited
JPS61105353A
Cited
JPS61105351A
Cited
US4735113A
Cited
US4747808A
Cited
JPS63176862A
Cited
JPH06331833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |