US3751912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hybrid brake booster using charging valve
Assignee: Bendix Corp
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Filing: 1972-02-10
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Granted: 1973-08-14
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Expires: 1992-02-10
Abstract
Abstract A hydraulic brake booster is disclosed which provides a power assist to the vehicle operator when the operator applies the vehicle''s brakes. The brake booster includes a first valve which restricts flow of fluid through the vehicle''s hydraulic system to develop back pressure in the latter, thereby providing a source of fluid pressure which is used to operate the booster. A back-up fluid supply is provided which is stored in a conventional fluid pressure accumulator. A second valve within the booster housing is actuated when a malfunction prevents normal development of fluid pressure in the booster. When this occurs, the second valve is opened to communicate the high pressure fluid stored in the accumulator into the booster to provide the power assist. A charging valve is also provided in the vehicle''s hydraulic system which is adapted to develop back pressure in the latter to communicate at least a portion of the fluid flowing through the system into the accumulator to charge the latter when the hydraulic system functions normally.
Inventors
- 👤 L Bach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:31
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/143
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
294 words
In a vehicle hydraulic system: a pump for providing fluid pressure in said system; a brake booster having an inlet port communicated with the outlet of said pump, an outlet port, a pressure chamber, and first valve means controlling communication between said inlet and outlet ports and said pressure chamber to effect a brake application; an accumulator communicated to said brake booster; and a charging valve communicated with said pump and with said accumulator, said charging valve permitting flow from said pump through said hydraulic system while diverting a portion of the flow through said system to said accumulator for maintaining a predetermined minimum pressure level in the latter; said brake booster including second valve means permitting fluid communication from said accumulator into said pressure chamber when a brake application is effected and a malfunction prevents fluid communication into said pressure chamber from said inlet port; said first valve means being shiftable from a first position permitting substantially uninhibited communication between said inlet and outlet ports and preventing communication between said inlet port and said chamber to a second position restricting flow between the inlet and outlet ports to develop back pressure in said inlet port and communicating said inlet port with said pressure chamber to effect a brake application; passage means defined within said valve means to communicate said inlet port to said pressure chamber when said first valve means is shifted from said first position; and actuating means slidably carried on said first valve means, said actuating means moving relative to said first valve means when the latter is disposed in said second postion to first terminate communication from said pressure chamber into said passage means and to thereafter actuate said second valve means to communicate said accumulator with said pressure chamber.
Claim 2
Dependent Claim
294 words
In a vehicle hydraulic system: a pump for providing fluid pressure in said system; a brake booster having an inlet port communicated with the outlet of said pump, an outlet port, a pressure chamber, and first valve means controlling communication between said inlet and outlet ports and said pressure chamber to effect a brake application; an accumulator communicated to said brake booster; and a charging valve communicated with said pump and with said accumulator, said charging valve permitting flow from said pump through said hydraulic system while diverting a portion of the flow through said system to said accumulator for maintaining a predetermined minimum pressure level in the latter; said brake booster including second valve means permitting fluid communication from said accumulator into said pressure chamber when a brake application is effected and a malfunction prevents fluid communication into said pressure chamber from said inlet port; said first valve means being shiftable from a first position permitting substantially uninhibited communication between said inlet and outlet ports and preventing communication between said inlet port and said chamber to a second position restricting flow between the inlet and outlet ports to develop back pressure in said inlet port and communicating said inlet port with said pressure chamber to effect a brake application; passage means defined within said valve means to communicate said inlet port to said pressure chamber when said first valve means is shifted from said first position; and actuating means slidably carried on said first valve means, said actuating means moving relative to said first valve means when the latter is disposed in said second postion to first terminate communication from said pressure chamber into said passage means and to thereafter actuate said second valve means to communicate said accumulator with said pressure chamber.
Claim 3
Dependent Claim
69 words
The invention of claim 1: said passage means terminating in first and second port means communicating said passage means with said pressure chamber, said actuating means closing said first port means upon movement of said actuating means relative to the first valve means; and check valve means preventing communication through said second port means from said pressure chamber into said passage means, but permitting communication in the reverse direction.
Claim 4
Dependent Claim
41 words
The invention of claim 2: said check valve means including a valve seating area circumscribing said passage means, a retainer, resilient means urging said retainer toward said valve seating area, and a sphere disposed between said retainer and said seating area.
Claim 5
Dependent Claim
319 words
In a vehicle hydraulic system: a pump for providing fluid pressure in said system; a brake booster having an inlet port communicated with the outlet of said pump, an outlet port, a pressure chamber, and first valve means controlling communication between said inlet and outlet ports and said pressure chamber to effect a brake application; an accumulator communicated to said brake booster; means for charging said accumulator with the fluid pressure output of said pump; second valve means permitting fluid communication from said accumulator into said pressure chamber when a brake application is effected and a malfunction prevents fluid communication into said pressure chamber from said inlet port; said first valve means being shiftable from a first position permitting substantially uninhibited communication between said inlet and outlet ports and preventing communication between said inlet port and said chamber to a second position restricting flow between the inlet and outlet ports to develop back prEssure in said inlet port and communicating said inlet port with said pressure chamber to effect a brake application; passage means defined within said valve means to communicate said inlet port to said pressure chamber when said first valve means is shifted from said first position; actuating means slidably carried on said first valve means, said actuating means moving relative to said first valve means when the latter is disposed in said second position to first terminate communication from said pressure chamber into said passage means and to thereafter actuate said second valve means to communicate said accumulator with said pressure chamber; said passage means terminating in first and second port means communicating said passage means with said pressure chamber, said actuating means closing said first port means upon movement of said actuating means relative to the first valve means; and check valve means preventing communication through said second port means from said pressure chamber into said passage means, but permitting communication in the reverse direction.
Claim 6
Dependent Claim
319 words
In a vehicle hydraulic system: a pump for providing fluid pressure in said system; a brake booster having an inlet port communicated with the outlet of said pump, an outlet port, a pressure chamber, and first valve means controlling communication between said inlet and outlet ports and said pressure chamber to effect a brake application; an accumulator communicated to said brake booster; means for charging said accumulator with the fluid pressure output of said pump; second valve means permitting fluid communication from said accumulator into said pressure chamber when a brake application is effected and a malfunction prevents fluid communication into said pressure chamber from said inlet port; said first valve means being shiftable from a first position permitting substantially uninhibited communication between said inlet and outlet ports and preventing communication between said inlet port and said chamber to a second position restricting flow between the inlet and outlet ports to develop back prEssure in said inlet port and communicating said inlet port with said pressure chamber to effect a brake application; passage means defined within said valve means to communicate said inlet port to said pressure chamber when said first valve means is shifted from said first position; actuating means slidably carried on said first valve means, said actuating means moving relative to said first valve means when the latter is disposed in said second position to first terminate communication from said pressure chamber into said passage means and to thereafter actuate said second valve means to communicate said accumulator with said pressure chamber; said passage means terminating in first and second port means communicating said passage means with said pressure chamber, said actuating means closing said first port means upon movement of said actuating means relative to the first valve means; and check valve means preventing communication through said second port means from said pressure chamber into said passage means, but permitting communication in the reverse direction.
Claim 7
Dependent Claim
41 words
The invention of claim 4: said check valve means including a valve seating area circumscribing said passage means, a retainer, resilient means urging said retainer toward said valve seating area, and a sphere disposed between said retainer and said seating area.
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |