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 11:10
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.
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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 |