US3754792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control valve assembly
Assignee: Aisin Corp
•
Filing: 1972-03-03
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Granted: 1973-08-28
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Expires: 1992-03-03
Abstract
Abstract A fluid pressure control system for a vehicle comprising front and rear brake cylinders, dual master cylinder having two distinct fluid chambers and a fluid pressure control valve assembly including means for directly delivering fluid pressure supplied from one of the fluid chambers of the dual master cylinder to the front brake cylinders, controlling means for delivering fluid pressure supplied from the other fluid chamber of the dual master cylinder to the rear brake cylinders at a lower rate than fluid pressure generated at the other fluid chamber of the dual master cylinder and means for directly delivering fluid pressure supplied from the other fluid chamber of the dual master cylinder to the rear brake cylinders in the event of hydraulic failure of the front brakes.
Inventors
- 👤 N Ishigami
- 👤 M Ban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:15
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; B60T17/00; B60T17/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
314 words
A fluid pressure control system for a vehicle comprising a pair of fluid pressure responsive brake cylinders; dual fluid pressure generating means for delivering separate fluid pressure to said brake cylinders, respectively; a fluid pressure control valve assembly including first means fluidically connected to one of said dual fluid pressure generating means, second means fluidically connected to one of said brake cylinders, a first fluid chamber formed in a housing of said control valve assembly and fluidically connected to said first and second means, respectively, a first piston slidably mounted within said first chamber, a first valve means cooperating with said first piston for controlling fluid pressure communication between said first means and said second means, third means fluidically connected to the other of said dual fluid pressure generating means, fourth means fluidically connected to the other of said brake cylinders, a second fluid chamber formed in the housing and fluidically connected to said third and fourth means, respectively, a second piston slidably mounted within said second chamber and including a hollow cylindrical portion to define a third fluid chamber normally fluidically connected to said first means, a reduced diameter portion to define a fourth annular fluid chamber normally fluidically connected to said second means and an annular portion exposed to said second chamber, said second piston being exposed to the respective fluid pressures delivered from said dual fluid pressure generating means at both ends thereof, a by-pass passage means constituted between said first and second means, a second valve means disposed in said third fluid chamber and tightly connected to said second piston and a first resilient means for biasing said second piston in a direction whereby said by-pass passage means is normally closed by said second valve means and is opened in the event of hydraulic failure of a hydraulic system including the other chamber of said dual fluid pressure generating means.
Claim 2
Dependent Claim
314 words
A fluid pressure control system for a vehicle comprising a pair of fluid pressure responsive brake cylinders; dual fluid pressure generating means for delivering separate fluid pressure to said brake cylinders, respectively; a fluid pressure control valve assembly including first means fluidically connected to one of said dual fluid pressure generating means, second means fluidically connected to one of said brake cylinders, a first fluid chamber formed in a housing of said control valve assembly and fluidically connected to said first and second means, respectively, a first piston slidably mounted within said first chamber, a first valve means cooperating with said first piston for controlling fluid pressure communication between said first means and said second means, third means fluidically connected to the other of said dual fluid pressure generating means, fourth means fluidically connected to the other of said brake cylinders, a second fluid chamber formed in the housing and fluidically connected to said third and fourth means, respectively, a second piston slidably mounted within said second chamber and including a hollow cylindrical portion to define a third fluid chamber normally fluidically connected to said first means, a reduced diameter portion to define a fourth annular fluid chamber normally fluidically connected to said second means and an annular portion exposed to said second chamber, said second piston being exposed to the respective fluid pressures delivered from said dual fluid pressure generating means at both ends thereof, a by-pass passage means constituted between said first and second means, a second valve means disposed in said third fluid chamber and tightly connected to said second piston and a first resilient means for biasing said second piston in a direction whereby said by-pass passage means is normally closed by said second valve means and is opened in the event of hydraulic failure of a hydraulic system including the other chamber of said dual fluid pressure generating means.
Claim 3
Dependent Claim
56 words
A fluid pressure control system as set forth in claim 1, wherein said second valve means is an annular-shaped resilient member, said resilient member being extended outwardly from said hollow cylindrical portion in nature state thereof and being pressed to the inner surface of said housing for interrupting said by-pass passage means upon normally braking application.
Claim 4
Dependent Claim
30 words
A fluid pressure control system as set forth in claim 1 further comprising second resilient means for biasing said first piston in the opening direction of said first valve means.
Claim 5
Dependent Claim
65 words
A fluid pressure control system as set forth in claim 3, wherein said second resilient means is a compression spring one end of which is engaged with said first piston and at the other end of which is engaged with said housing through a retainer, said retainer including guide portions supported with respect to a cylinder portion of said housing to form said first chamber.
Claim 6
Dependent Claim
48 words
A fluid pressure control system as set forth in claim 4, wherein said retainer further comprises a hole adapted to pass said first piston therethrough, an annular extending portion for guiding said compression spring and tongue portions guided and supported on an annular projecting portion of said housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |