US3661429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure control device for hydraulic brake system of powered vehicles
Assignee: Aisin Corp
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Filing: 1970-08-11
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Granted: 1972-05-09
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Expires: 1990-08-11
Abstract
Abstract A pressure control device for hydraulic brake systems for use on powered vehicles wherein a pressure fluid passage from a powered pressure source such as an accumulator to the wheel cylinders is provided separately from a fluid passage through which the pressurized fluid is conveyed back from the wheel cylinders to a reservoir, so that the pressure fluid is circulated in the brake system without returning through the same fluid passage.
Inventors
- 👤 Masahiro Kito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:48
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B60T11/18; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/141
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
249 words
A pressure control device comprising, a reservoir; a hydraulic fluid pressure source connected to said reservoir; wheel cylinders; a control valve assembly comprising a cylinder housing; said cylinder housing being provided with a first inlet port connected to said source through a first conduit, a compensation port connected to said reservoir through a second conduit, an outlet port connected to said wheel cylinders through a third conduit, a second inlet port connected to said wheel cylinders through a fourth conduit, said third conduit being constantly communicated with said fourth conduit through said wheel cylinders, a first fluid passageway connecting said first inlet port to said outlet port, a first valve means provided in said first fluid passageway and adapted for interrupting fluid communication between said first and third conduits when no brake is applied and for establishing fluid communication therebetween when brake is applied, a second fluid passageway connecting said compensation port to said second inlet port, a second valve means provided in said second fluid passageway and adapted for establishing fluid communication between said second and fourth conduits when no brake is applied and for interrupting fluid communication therebetween when brake is applied, whereby a hydraulic pressure from said source is applied to said wheel cylinders through said first conduit, said first passageway, and said third conduit when the brake is applied, and then led to said reservoir from said wheel cylinders through said fourth conduit, said second passageway, and said second conduit when the brake is released.
Claim 2
Dependent Claim
249 words
A pressure control device comprising, a reservoir; a hydraulic fluid pressure source connected to said reservoir; wheel cylinders; a control valve assembly comprising a cylinder housing; said cylinder housing being provided with a first inlet port connected to said source through a first conduit, a compensation port connected to said reservoir through a second conduit, an outlet port connected to said wheel cylinders through a third conduit, a second inlet port connected to said wheel cylinders through a fourth conduit, said third conduit being constantly communicated with said fourth conduit through said wheel cylinders, a first fluid passageway connecting said first inlet port to said outlet port, a first valve means provided in said first fluid passageway and adapted for interrupting fluid communication between said first and third conduits when no brake is applied and for establishing fluid communication therebetween when brake is applied, a second fluid passageway connecting said compensation port to said second inlet port, a second valve means provided in said second fluid passageway and adapted for establishing fluid communication between said second and fourth conduits when no brake is applied and for interrupting fluid communication therebetween when brake is applied, whereby a hydraulic pressure from said source is applied to said wheel cylinders through said first conduit, said first passageway, and said third conduit when the brake is applied, and then led to said reservoir from said wheel cylinders through said fourth conduit, said second passageway, and said second conduit when the brake is released.
Claim 3
Dependent Claim
61 words
The pressure control device as defined in claim 1, wherein said first valve means is formed by a piston mounted in said housing and being provided with an axial bore and a first valve seat therein, and a valve member slidably mounted in said axial bore and being provided with a first valve part to cooperate with said first valve seat.
Claim 4
Dependent Claim
52 words
The pressure control device as defined in claim 2, wherein said valve member is further provided with a second valve part at its one end and an axially central bore therein, and said second valve means is formed by said second valve part and a cooperating valve element mounted in said housing.
Claim 5
Dependent Claim
37 words
The pressure control device as defined in claim 3, wherein said cooperating valve element is a ball movably mounted in a valve carrier which is slidably fitted in said housing and operatively connected to a brake pedal.
Claim 6
Dependent Claim
33 words
The pressure control device as defined in claim 3, said valve member is provided with an enlarged outer portion slidably mounted in said housing to constitute a pressure chamber at each side thereof.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |