Patent US3620646A successfully refreshed from Google Patents.
US3620646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Central hydraulic system for a vehicle
Assignee: Motors Liquidation Co
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Filing: 1970-07-01
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Granted: 1971-11-16
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Expires: 1990-07-01
Abstract
Abstract In a vehicle having an automatic transmission and power steering, there is provided a central hydraulic system wherein flow from a pump is directed to a first flow-control valve which delivers flow up to a predetermined rate to a second flow-control valve while delivering any excess fluid flow to an aspirator which acts to supercharge the pump. The second flow-control valve delivers flow up to a predetermined lower rate to the power steering system while delivering any excess fluid flow to the transmission control system which is also receiving all of the flow from the power steering system.
Inventors
- 👤 Paul D Stevenson
- 👤 Leon A Tucholski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:27
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/0021; B; B62; B62D; B62D5/00; B62D5/06; B62D5/07; F15; F15B; F15B11/00; F15B11/16; F15B11/20; F16H57/00; F16H57/04; F16H57/0434; F16H57/0436; F16H57/0438; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521; Y10T137/2524; Y10T137/2559; Y10T137/2574; Y10T137/2579; Y10T137/2582
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
144 words
In a fluid-supply system for a vehicle having an automatic transmission and also power steering, the combination of a pump for delivering fluid under pressure; first flow-control valve means for receiving fluid from said pump and providing a fluid flow rate limited to a predetermined value by exhausting any excess fluid flow; aspirator means for receiving exhausted fluid flow from said first flow-control valve means to effect supercharging of said pump; a power steering system; a transmission control system connected to receive all fluid passing through said power steering system; and second flowcontrol valve means for receiving the controlled fluid fLow from said first control valve means and providing a fluid flow rate to said power steering system limited to a predetermined value lower than that provided by said first flow-control valve means by exhausting any excess fluid flow to said transmission control system.
Claim 2
Dependent Claim
144 words
In a fluid-supply system for a vehicle having an automatic transmission and also power steering, the combination of a pump for delivering fluid under pressure; first flow-control valve means for receiving fluid from said pump and providing a fluid flow rate limited to a predetermined value by exhausting any excess fluid flow; aspirator means for receiving exhausted fluid flow from said first flow-control valve means to effect supercharging of said pump; a power steering system; a transmission control system connected to receive all fluid passing through said power steering system; and second flowcontrol valve means for receiving the controlled fluid fLow from said first control valve means and providing a fluid flow rate to said power steering system limited to a predetermined value lower than that provided by said first flow-control valve means by exhausting any excess fluid flow to said transmission control system.
Claim 3
Dependent Claim
180 words
In a fluid-supply system for a vehicle having an automatic transmission and also power steering, the combination of a power steering system; a transmission control system connected to receive all fluid passing through said power steering system; a pump for delivering fluid under pressure; first flow-control valve means for receiving fluid from said pump and providing a fluid flow rate limited to a value meeting the maximum requirement of said transmission control system by exhausting any excess fluid flow; aspirator means for receiving exhausted fluid flow from said first flow-control valve means to effect supercharging of said pump; and second flow-control valve means for receiving the controlled fluid flow from said first control valve means and providing a fluid flow rate to said power steering system limited to a value meeting the maximum requirement of said power steering system by exhausting any excess fluid flow to said transmission control system whereby the flow requirement of said transmission control system is met before pump supercharging occurs and said transmission control system does not receive more than its maximum fluid flow requirement.
Claim 4
Dependent Claim
180 words
In a fluid-supply system for a vehicle having an automatic transmission and also power steering, the combination of a power steering system; a transmission control system connected to receive all fluid passing through said power steering system; a pump for delivering fluid under pressure; first flow-control valve means for receiving fluid from said pump and providing a fluid flow rate limited to a value meeting the maximum requirement of said transmission control system by exhausting any excess fluid flow; aspirator means for receiving exhausted fluid flow from said first flow-control valve means to effect supercharging of said pump; and second flow-control valve means for receiving the controlled fluid flow from said first control valve means and providing a fluid flow rate to said power steering system limited to a value meeting the maximum requirement of said power steering system by exhausting any excess fluid flow to said transmission control system whereby the flow requirement of said transmission control system is met before pump supercharging occurs and said transmission control system does not receive more than its maximum fluid flow requirement.
Claim 5
Dependent Claim
295 words
In a fluid-supply system for a vehicle having an automatic transmission and also power steering, the combination of a fluid sump; a pump having an inlet connected to said sump and also having an outlet; first flow control valve means having an inlet connected to the outlet of said pump and also having an outlet and an exhaust and being operable to limit fluid flow from the inlet to the outlet to a predetermined flow rate and deliver any excess fluid flow to the exhaust; aspirator means connected to the inlet of said pump and also to the exhaust of said first flow-control valve means for supercharging the inlet of said pump by using the excess fluid flow from said first flow-control valve means to suction fluid from said sump and force it into the inlet of said pump; second flow-control valve means having an inlet connected to the outlet of said first flow-control valve means and also having an outlet and an exhaust and being operable to limit fluid flow from the inlet to the outlet of said second flow-control valve means to a predetermined flow rate lower than that of said first flow-control valve means and deliver any excess fluid flow to the exhaust of said second flow-control valve means; a power steering system having an inlet connected to the outlet of said second flow-control valve and also having an outlet; a transmission control system including a fluid pressure supply passage connected to the outlet of said power steering system and also to the exhaust of said second flow-control valve means; and said transmission control system also including pressure regulator valve means for regulating the pressure in said fluid pressure supply passage by delivering any excess fluid to the inlet of said pump.
Claim 6
Dependent Claim
295 words
In a fluid-supply system for a vehicle having an automatic transmission and also power steering, the combination of a fluid sump; a pump having an inlet connected to said sump and also having an outlet; first flow control valve means having an inlet connected to the outlet of said pump and also having an outlet and an exhaust and being operable to limit fluid flow from the inlet to the outlet to a predetermined flow rate and deliver any excess fluid flow to the exhaust; aspirator means connected to the inlet of said pump and also to the exhaust of said first flow-control valve means for supercharging the inlet of said pump by using the excess fluid flow from said first flow-control valve means to suction fluid from said sump and force it into the inlet of said pump; second flow-control valve means having an inlet connected to the outlet of said first flow-control valve means and also having an outlet and an exhaust and being operable to limit fluid flow from the inlet to the outlet of said second flow-control valve means to a predetermined flow rate lower than that of said first flow-control valve means and deliver any excess fluid flow to the exhaust of said second flow-control valve means; a power steering system having an inlet connected to the outlet of said second flow-control valve and also having an outlet; a transmission control system including a fluid pressure supply passage connected to the outlet of said power steering system and also to the exhaust of said second flow-control valve means; and said transmission control system also including pressure regulator valve means for regulating the pressure in said fluid pressure supply passage by delivering any excess fluid to the inlet of said pump.
References Cited (Backward Citations)
US2983226A
Cited
US3385311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |