Patent US2822933A successfully refreshed from Google Patents.
Patent US3910643A successfully refreshed from Google Patents.
US3910643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-skid brake control system for a wheeled vehicle
Assignee: Aisin Corp
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Filing: 1973-02-21
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Granted: 1975-10-07
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Expires: 1993-02-21
Abstract
Abstract An anti-skid brake control system including a power booster actuated by a hydraulic pressure source. The power booster comprises a valve movable by a brake pedal and first and second chambers separated by a power piston which is connected to a master cylinder. The two chambers have different effective areas and the arrangement being such that in normal brake operation, the first chamber communicates with the pressure source via the valve while the second chamber communicates with a reservoir and the power piston is actuated to apply the normal brake operation due to the pressure difference therebetween, and an anti-skid brake operation the second chamber also communicates with the pressure source via an electro magnetic valve actuated by a skid sensor, and thus, the brake pressure is decreased due to the pressure difference caused by the difference of the effective areas between the two chambers.
Inventors
- 👤 Uichiro Kobashi
- 👤 Masami Inada
- 👤 Katsuki Takayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:52
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/143; B60T11/00; B60T11/10; B60T11/16; B60T11/20; B60T11/203; B60T11/206; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/363; B60T8/3635; B60T8/40; B60T8/4004; B60T8/44; B60T8/441; B60T8/447
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
264 words
An anti-skid brake control system for a wheeled vehicle having a manually operable brake pedal, a master cylinder and wheel brake cylinders hydraulically connected to said master cylinder, comprising; a booster disposed between said brake pedal and said master cylinder, a hydraulic pressure source supplying pressure to said booster for increasing the brake force applied to said master cylinder, a reservoir hydraulically connected to said hydraulic pressure source, means for generating a signal in response to a wheel locking condition, and an electromagnetic valve means actuated by said signal for connecting said booster selectively with said reservoir and said hydraulic pressure source, said booster including, a valve means movable by said brake pedal and being connected selectively with said reservoir and said hydraulic pressure source, a power piston means operably connected to said master cylinder and defining first and second chambers having different effective areas, said first chamber communicating with said valve means, and said second chamber communicating with said electromagnetic valve means, said second chamber having a larger effective area than said first chamber, and biasing means normally urging said power piston to the nonbraking position, whereby, in normal brake operation said first chamber is connected to said hydraulic pressure source and said second chamber is connected to said reservoir to actuate said power piston means, and in anti-skid brake operation, said second chamber is also connected to said hydraulic pressure source via said electromagnetic valve means whereby the higher pressure in said second chamber having the larger effective area and said biasing means actuates said power piston to decrease the brake force.
Claim 2
Dependent Claim
264 words
An anti-skid brake control system for a wheeled vehicle having a manually operable brake pedal, a master cylinder and wheel brake cylinders hydraulically connected to said master cylinder, comprising; a booster disposed between said brake pedal and said master cylinder, a hydraulic pressure source supplying pressure to said booster for increasing the brake force applied to said master cylinder, a reservoir hydraulically connected to said hydraulic pressure source, means for generating a signal in response to a wheel locking condition, and an electromagnetic valve means actuated by said signal for connecting said booster selectively with said reservoir and said hydraulic pressure source, said booster including, a valve means movable by said brake pedal and being connected selectively with said reservoir and said hydraulic pressure source, a power piston means operably connected to said master cylinder and defining first and second chambers having different effective areas, said first chamber communicating with said valve means, and said second chamber communicating with said electromagnetic valve means, said second chamber having a larger effective area than said first chamber, and biasing means normally urging said power piston to the nonbraking position, whereby, in normal brake operation said first chamber is connected to said hydraulic pressure source and said second chamber is connected to said reservoir to actuate said power piston means, and in anti-skid brake operation, said second chamber is also connected to said hydraulic pressure source via said electromagnetic valve means whereby the higher pressure in said second chamber having the larger effective area and said biasing means actuates said power piston to decrease the brake force.
Claim 3
Dependent Claim
51 words
An anti-skid brake control system as set forth in claim 1, wherein said booster further comprises a manual piston means operatively connected to said brake pedal, said manual piston means being in unison with said power piston means to actuate same in case of pressure leakage in said hydraulic pressure source.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |