US3800913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recirculating oil system
Assignee: Caterpillar Inc
•
Filing: 1972-08-04
•
Granted: 1974-04-02
•
Expires: 1992-08-04
Abstract
Abstract There is disclosed an oil supply and recirculating system for a motor vehicle in combination with the transmission and differential of the vehicle. The oil supply system comprises an oil reservoir comprising three separate oil receiving chambers, one of the reservoirs being the main oil supply reservoir, with one chamber receiving and serving as the transmission sump, while the remaining reservoir serves as the differential sump and overflow reservoir for the main supply reservoir. The system includes a main supply and control system pump for supplying pressurized fluid for operation and control of the transmission, and a second scavenging pump operative to scavenge the transmission sump and to recirculate oil from the overflow tank to the main supply tank.
Inventors
- 👤 J Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:07
CPC Classifications
F; F16; F16H; F16H57/00; F16H57/04; F16H57/0447; F01; F01M; F01M1/00; F01M1/12; F16N; F16N19/00; F01M2001/123; F16H57/0434; F16H57/0441; F16H57/0445; F16H57/045; F16H57/048; F16H57/0482; F16H57/0483; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2186
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
A recirculating oil system in combination with a hydraulically controlled transmission and a differential, said system comprising: oil reservoir means comprising three separate chambers; said chambers comprising a main supply chamber, a transmission sump, and a differential sump; a transmission disposed in said transmission sump; a differential disposed in said differential sump; a scavenge pump; conduit means operatively connecting said scavenge pump to draw oil from said transmission sump and from said differential sump and supply said oil to said main sump chamber; and, a main supply pump operatively connected to draw oil from said supply tank and deliver it to said transmission.
Claim 2
Dependent Claim
103 words
A recirculating oil system in combination with a hydraulically controlled transmission and a differential, said system comprising: oil reservoir means comprising three separate chambers; said chambers comprising a main supply chamber, a transmission sump, and a differential sump; a transmission disposed in said transmission sump; a differential disposed in said differential sump; a scavenge pump; conduit means operatively connecting said scavenge pump to draw oil from said transmission sump and from said differential sump and supply said oil to said main sump chamber; and, a main supply pump operatively connected to draw oil from said supply tank and deliver it to said transmission.
Claim 3
Dependent Claim
20 words
The oil system of claim 1 comprising restriction means in said conduit between said differential sump and said scavenge pump.
Claim 4
Dependent Claim
37 words
The oil system of claim 1 wherein said scavenge pump comprises three inlets; said transmission sump is in communication with two of said inlets; and, said differential sump is in communication with the other of said inlets.
Claim 5
Dependent Claim
21 words
The oil system of claim 3 comprising restricting means in said conduit means communicating said differential sump with said scavenge pump.
Claim 6
Dependent Claim
39 words
The oil system of claim 4 wherein said scavenge pump is a gear pump; said restricted conduit communicates with an inlet disposed between said gears; and, said two of said inlets communicate separately with each of said two gears.
Claim 7
Dependent Claim
60 words
A recirculating oil system comprising in combination: a first oil reservoir; a transmission disposed in said first reservoir; a second oil reservoir; a pump operatively connected to scavenge said first reservoir; said pump operatively connected by conduit means including restriction means to draw a restricted amount of oil from said second reservoir and supply said oil to a third reservoir.
Claim 8
Dependent Claim
60 words
A recirculating oil system comprising in combination: a first oil reservoir; a transmission disposed in said first reservoir; a second oil reservoir; a pump operatively connected to scavenge said first reservoir; said pump operatively connected by conduit means including restriction means to draw a restricted amount of oil from said second reservoir and supply said oil to a third reservoir.
Claim 9
Dependent Claim
38 words
The oil system of claim 6 wherein said scavenge pump comprises three inlets; said first reservoir is in communication with two of said inlets; and, said second reservoir is in restricted communication with the other of said inlets.
Claim 10
Dependent Claim
39 words
The oil system of claim 7 wherein said scavenge pump is a gear pump; said restricted communication is with an inlet disposed between said gears; and, said two of said inlets communicate separately with each of said two gears.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |