US3653209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle hydraulic system
Assignee: Bendix Corp
•
Filing: 1970-08-31
•
Granted: 1972-04-04
•
Expires: 1990-08-31
Abstract
Abstract A hydraulic system for a motor vehicle having an open center type hydraulic power brake booster, an open center type hydraulic power steering gear, and an adaptive braking system using hydraulically powered brake line pressure modulators. The system includes a control valve receiving flow from an engine driven pump and a drive shaft driven pump delivering appropriate quantities of fluid to the brake booster and steering gear. They also deliver fluid at the correct pressure to the brake line pressure modulators upon receiving a pressure signal from the brake booster. Check valves are provided in the pump discharge lines to prevent backflow through a pump in the event of failure of the pump or its drive mechanism. The system control valve also includes pressure relief valves to limit pressures in the several systems to appropriate levels.
Inventors
- 👤 Stanley I Macduff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:55
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/16; B60T13/161; B60T8/00; B60T8/32; B60T8/321; B60T8/328; F; F15; F15B; F15B13/00; F15B13/02; F15B13/022
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
139 words
A vehicle hydraulic system comprising: a hydraulic fluid reservoir; pump means receiving fluid from said reservoir and discharging pressurized fluid; valve means for receiving said discharged fluid from said pump means, said valve means having flow control means for dividing said discharged fluid into a controlled stream and an uncontrolled stream, and pressure control means operated by pilot means for regulating said uncontrolled stream to obtain additionally pressurized fluid; a power steering gear operated by said controlled stream; a brake booster operated by said controlled stream, said brake booster supplying pressure to said pilot means to operate said pressure control means; and an adaptive braking system having hydraulically operated brake pressure modulators that operate from said adDitionally pressurized fluid supplied by said pressure control means; said pressure control means returning unused portions of said uncontrolled stream to said reservoir.
Claim 2
Dependent Claim
139 words
A vehicle hydraulic system comprising: a hydraulic fluid reservoir; pump means receiving fluid from said reservoir and discharging pressurized fluid; valve means for receiving said discharged fluid from said pump means, said valve means having flow control means for dividing said discharged fluid into a controlled stream and an uncontrolled stream, and pressure control means operated by pilot means for regulating said uncontrolled stream to obtain additionally pressurized fluid; a power steering gear operated by said controlled stream; a brake booster operated by said controlled stream, said brake booster supplying pressure to said pilot means to operate said pressure control means; and an adaptive braking system having hydraulically operated brake pressure modulators that operate from said adDitionally pressurized fluid supplied by said pressure control means; said pressure control means returning unused portions of said uncontrolled stream to said reservoir.
Claim 3
Dependent Claim
21 words
The hydraulic system of claim 1 wherein said power steering gear and said brake booster are of the open center types.
Claim 4
Dependent Claim
25 words
The hydraulic system of claim 2 wherein said pump means comprises an engine driven pump and a drive shaft driven pump in a parallel relationship.
Claim 5
Dependent Claim
22 words
The hydraulic system of claim 3 wherein said valve means includes a check value in the outlet of each of said pumps.
Claim 6
Dependent Claim
111 words
A valve for use in a vehicle hydraulic system having pump means and reservoir means, comprising: a housing formed with port means for receiving a stream of fluid from said pump means; flow control means in the housing for receiving the stream of fluid from said pump means, said flow control means being constructed to divide the stream of flow into a controlled stream and an uncontrolled stream; pressure control means in said housing adapted to maintain a predetermined pressure on said uncontrolled stream; and pilot valve means in said housing for rendering said pressure control means inoperative; said pilot valve means being responsive to a pressure from an outside source.
Claim 7
Dependent Claim
111 words
A valve for use in a vehicle hydraulic system having pump means and reservoir means, comprising: a housing formed with port means for receiving a stream of fluid from said pump means; flow control means in the housing for receiving the stream of fluid from said pump means, said flow control means being constructed to divide the stream of flow into a controlled stream and an uncontrolled stream; pressure control means in said housing adapted to maintain a predetermined pressure on said uncontrolled stream; and pilot valve means in said housing for rendering said pressure control means inoperative; said pilot valve means being responsive to a pressure from an outside source.
Claim 8
Dependent Claim
59 words
The valve of claim 5 wherein said flow control means includes: A member formed with a flow metering orifice; A first set of cooperating valve elements positioned between the stream of fluid from said pump means and the uncontrolled stream; and A second set of cooperating valve elements positioned in the controlled stream downstream from said flow metering orifice.
Claim 9
Dependent Claim
39 words
The valve of claim 6 wherein said pump means comprises two pumps, said port means having at least two ports for receiving the streams of fluid from said pumps, said valve having check valve means positioned between said ports.
Claim 10
Dependent Claim
102 words
The valve of claim 5 wherein said pressure means comprises: a bore in said housing having closed ends forming two chambers, one of which receives the uncontrolled stream, said bore being formed with a first valve element for restricting said uncontrolled stream; a passage in said housing connecting said chambers, said passage having a restrictive orifice; a plunger in said bore separating the two chambers and formed with a second valve element cooperating with said first valve element for restricting said uncontrolled stream; spring means biasing said plunger toward its restricting position; and means for controlling the pressure in the other chamber.
Claim 11
Dependent Claim
54 words
The valve of claim 8 wherein said means for controlling the pressure in the other chamber comprises: a passage in said plunger which leads to said reservoir; a valve seat in said passage in said plunger; a ball resting on said valve seat; and spring means for exerting a predetermined load on said ball.
Claim 12
Dependent Claim
31 words
The valve of claim 8 wherein said pilot valve means comprises: a passage in said housing leading from said other chamber to said reservoir; and a poppet valve in said passage.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |