US4751858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling quantity of lubricating oil in automatic transmission for vehicle
Assignee: Toyota Motor Corp
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Filing: 1986-12-12
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Granted: 1988-06-21
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Expires: 2006-12-12
Abstract
Abstract In a device for controlling a quantity of lubricating oil in an automatic transmission for a vehicle, wherein a pump is rotated to circulate the lubricating oil, a circulation quantity of lubricating oil is increased, decreased or changed in accordance with the speed of the vehicle. As a result, the circulation quantity of lubricating oil in the automatic transmission is constantly regulated to ensure the necessary and sufficient quantities, even when there is a throttle opening of zero, and more particularly, even during high speed coasting.
Inventors
- 👤 Kunihiro Iwatsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:10
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/0021; F16H57/00; F16H57/04; F16H57/0434; F16H2061/0037; F16H59/00; F16H59/36; F16H59/44; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19991
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
70 words
A device for controlling a quantity of lubricating oil in an automatic transmission for a vehicle having an engine, wherein a pump is rotated to circulate the lubricating oil, comprising: means for detecting a vehicle speed; and means for setting a circulation quantity of lubricating oil such that said circulation quantity increases as a function of detected increases in vehicle speed, even when the load of said engine is zero.
Claim 2
Independent Claim
70 words
A device for controlling a quantity of lubricating oil in an automatic transmission for a vehicle having an engine, wherein a pump is rotated to circulate the lubricating oil, comprising: means for detecting a vehicle speed; and means for setting a circulation quantity of lubricating oil such that said circulation quantity increases as a function of detected increases in vehicle speed, even when the load of said engine is zero.
Claim 3
Dependent Claim
85 words
The device for controlling the quantity of lubricating oil as set forth in claim 1, further comprising: means for detecting at least one of an engine load, an occurrence of shifting, a type of shifting, a pattern of shifting and a gear stage; wherein, said means for setting a circulation quantity of lubricating oil further sets said circulation quantity in accordance with at least one of said engine load, said occurrence of shifting, said type of shifting, said pattern of shifting and said gear stage.
Claim 4
Dependent Claim
31 words
The device for controlling the quantity of lubricating oil as set forth in claim 2, wherein said means for setting said circulation quantity of lubricating oil includes an electromagnetic proportion valve.
Claim 5
Dependent Claim
32 words
The device for controlling the quantity of lubricating oil as set forth in claim 2, wherein said means for setting said circulation quantity of lubricating oil includes a duty ratio control valve.
Claim 6
Dependent Claim
87 words
The device for controlling the quantity of lubricating oil as set forth in claim 1, further comprising: means for detecting an occurrence of shifting; means for detecting a type of shifting; means for detecting an engine load; and means for ascertaining a predetermined period of time after shifting has occurred; wherein said means for setting a circulation quantity of lubricating oil further sets said circulation quantity in accordance with said type of shifting and said engine load, for said predetermined period of time after shifting has occurred.
Claim 7
Dependent Claim
31 words
The device for controlling the quantity of lubricating oil as set forth in claim 5, wherein said means for setting said circulation quantity of lubricating oil includes an electromagnetic proportion valve.
Claim 8
Dependent Claim
32 words
The device for controlling the quantity of lubricating oil as set forth in claim 5, wherein said means for setting said circulation quantity of lubricating oil includes a duty ratio control valve.
Claim 9
Dependent Claim
34 words
The device for controlling the quantity of lubricating oil as set forth in claim 5, wherein said predetermined period of time is changed in accordance with said type of shifting and said engine load.
Claim 10
Dependent Claim
31 words
The device for controlling the quantity of lubricating oil as set forth in claim 8, wherein said means for setting said circulation quantity of lubricating oil includes an electromagnetic proportion valve.
Claim 11
Dependent Claim
32 words
The device for controlling the quantity of lubricating oil as set forth in claim 8, wherein said means for setting said circulation quantity of lubricating oil includes a duty ratio control valve.
Claim 12
Dependent Claim
31 words
The device for controlling the quantity of lubricating oil as set forth in claim 1, wherein said means for setting said circulation quantity of lubricating oil includes an electromagnetic proportion valve.
Claim 13
Dependent Claim
32 words
The device for controlling the quantity of lubricating oil as set forth in claim 1, wherein said means for setting said circulation quantity of lubricating oil includes a duty ratio control valve.
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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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |