US3893694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pressure antiskid control apparatus for a vehicle
Assignee: Aisin Corp
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Filing: 1973-10-31
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Granted: 1975-07-08
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Expires: 1993-10-31
Abstract
Abstract Hydraulic pressure antiskid control apparatus for a vehicle includes a pressure accumulator for supplying fluid pressure to a chamber for actuating a piston and valve disposed within the flow path between the vehicle master cylinder and the wheel cylinders, a changeover valve for alternatively connecting the chamber to the pressure accumulator and a reservoir, an electrocircuit for detecting wheel lock or skid conditions and actuating the changeover valve, a switch for detecting the presence of insufficient pressure of the accumulator, an emergency pressure accumulator, and a valve associated with the emergency pressure accumulator for permitting pressure therefrom to flow to the chamber.
Inventors
- 👤 Masami Inada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:42
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208; B60T8/4225; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/148; B60T8/36; B60T8/3615; B60T8/3675; B60T8/88; B60T8/92; B60T8/94
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
233 words
A hydraulic pressure antiskid control apparatus for a vehicle braking system having a master cylinder and slave wheel cylinders, comprising: A first pressure accumulator; a piston which is capable of being moved by hydraulic pressure from said pressure accumulator; means for accumulating repulsive energy responsive to said movement of said piston; first valve means operated by said piston for permitting or preventing the flow of hydraulic pressure for the braking operation; second valve means interposed between the vehicle master cylinder and the wheel cylinders; power piston means for receiving the hydraulic pressure within the flow path which includes said second valve means, upon one side thereof, and for receiving the hydraulic pressure of said pressure accumulator upon the other side thereof; chamber means for transmitting said hydraulic pressure from said pressure accumulator to said power piston means; changeover valve means for alternately connecting said chamber means to said pressure accumulator and a reservoir; third valve means operative with said piston for connecting said chamber means to said changeover valve; said changeover valve means being operative by electrocircuit means for detecting wheel lock conditions; means for detecting the failure of said power piston means to be moved in accordance with said hydraulic pressure; a second accumulator; fourth valve means responsive to said failure detecting means and for connecting said second pressure accumulator with said chamber means; and a safety valve within said chamber means.
Claim 2
Dependent Claim
233 words
A hydraulic pressure antiskid control apparatus for a vehicle braking system having a master cylinder and slave wheel cylinders, comprising: A first pressure accumulator; a piston which is capable of being moved by hydraulic pressure from said pressure accumulator; means for accumulating repulsive energy responsive to said movement of said piston; first valve means operated by said piston for permitting or preventing the flow of hydraulic pressure for the braking operation; second valve means interposed between the vehicle master cylinder and the wheel cylinders; power piston means for receiving the hydraulic pressure within the flow path which includes said second valve means, upon one side thereof, and for receiving the hydraulic pressure of said pressure accumulator upon the other side thereof; chamber means for transmitting said hydraulic pressure from said pressure accumulator to said power piston means; changeover valve means for alternately connecting said chamber means to said pressure accumulator and a reservoir; third valve means operative with said piston for connecting said chamber means to said changeover valve; said changeover valve means being operative by electrocircuit means for detecting wheel lock conditions; means for detecting the failure of said power piston means to be moved in accordance with said hydraulic pressure; a second accumulator; fourth valve means responsive to said failure detecting means and for connecting said second pressure accumulator with said chamber means; and a safety valve within said chamber means.
Claim 3
Dependent Claim
22 words
Control apparatus as set forth in claim 1, wherein said changeover valve means and said fourth valve means are solenoid operated valves.
Claim 4
Dependent Claim
81 words
Control apparatus as set forth in claim 2, wherein said changeover valve means further comprises: a pair of solenoids for respectively actuating a pair of pistons; a first set of groove means provided upon the outer peripheral surfaces of said pair of pistons; and a second set of groove means provided within said changeover valve means for establishing a set of flow paths with said first set of groove means in accordance with excitation or non-excitation of said pair of solenoids.
Claim 5
Dependent Claim
162 words
A hydraulic pressure antiskid control apparatus for a vehicle braking system having a master cylinder and slave wheel cylinders, comprising: a first pressure accumulator; first valve means interposed within a flow path between the vehicle master cylinder and the wheel cylinders; power piston means for receiving the hydraulic pressure within the flow path which includes said first valve means, upon one side thereof and for receiving the hydraulic pressure of said pressure accumulator upon the other side thereof; chamber means for transmitting said hydraulic pressure from said pressure accumulator to said power piston means; changeover valve means for alternately connecting said chamber means to said pressure accumulator and a reservoir, said changeover valve means being operative by electrocircuit means for detecting wheel lock conditions; means for detecting failure of said hydraulic pressure for actuating said power piston means; a second pressure accumulator; and second valve means responsive to said failure detecting means and connecting said second pressure accumulator with said chamber means.
Claim 6
Dependent Claim
162 words
A hydraulic pressure antiskid control apparatus for a vehicle braking system having a master cylinder and slave wheel cylinders, comprising: a first pressure accumulator; first valve means interposed within a flow path between the vehicle master cylinder and the wheel cylinders; power piston means for receiving the hydraulic pressure within the flow path which includes said first valve means, upon one side thereof and for receiving the hydraulic pressure of said pressure accumulator upon the other side thereof; chamber means for transmitting said hydraulic pressure from said pressure accumulator to said power piston means; changeover valve means for alternately connecting said chamber means to said pressure accumulator and a reservoir, said changeover valve means being operative by electrocircuit means for detecting wheel lock conditions; means for detecting failure of said hydraulic pressure for actuating said power piston means; a second pressure accumulator; and second valve means responsive to said failure detecting means and connecting said second pressure accumulator with said chamber means.
Claim 7
Dependent Claim
24 words
Control apparatus as set forth in claim 4, further comprising a piston capable of being moved by hydraulic pressure from said first pressure accumulator.
Claim 8
Dependent Claim
22 words
Control apparatus as set forth in claim 5, further comprising means for accumulating repulsive energy responsive to said movement of said piston.
Claim 9
Dependent Claim
30 words
Control apparatus as set forth in claim 6, further comprising third valve means operated by said piston for permitting or preventing the flow of hydraulic pressure for the braking operation.
Claim 10
Dependent Claim
27 words
Control apparatus as set forth in claim 7, further comprising fourth valve means operative with said piston for connecting said chamber means to said changeover valve means.
Claim 11
Dependent Claim
17 words
Control apparatus as set forth in Claim 8, further comprising a safety valve within said chamber means.
Claim 12
Dependent Claim
25 words
Control apparatus as set forth in claim 9, further comprising a pressure source for supplying the fluid pressure to said first and second pressure accumulators.
Claim 13
Dependent Claim
21 words
Control apparatus as set forth in claim 10, wherein said changeover valve means and second valve means are solenoid operated valves.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |