US3719044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hybrid brake booster control valve
Assignee: Bendix Corp
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Filing: 1971-08-18
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Granted: 1973-03-06
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Expires: 1991-08-18
Abstract
Abstract A hydraulic brake booster is disclosed which is normally operated by fluid pressure delivered to the booster from the vehicle''s power steering pump. However, an auxiliary fluid supply is also provided which delivers pressurized fluid to the booster when the vehicle''s power steering pump fails to operate, due either to a malfunction of the latter or to termination of operation of the vehicle''s engine while the vehicle is in motion. The auxiliary fluid supply includes an accumulator which is charged by pressurized fluid from the power steering pump while the latter operates normally. A conduit is provided which communicates the accumulator directly into the booster pressure chamber. A control valve is provided which controls communication of fluid from the accumulator to the pressure chamber. The control valve is operated by the operator-operated spool which also controls fluid communication between the power steering pump and the booster upon actuation of the spool valve after operation of the power steering pump terminates. The control valve is responsive to the fluid pressure level in the pressure chamber such that the control valve remains closed as long as high pressure fluid exists in the pressure chamber, but may be easily operated when a relatively low pressure level exists in the pressure chamber.
Inventors
- 👤 L Bach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:51
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/16; B60T13/161; B60T13/162; B60T13/14; B60T13/148
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
152 words
In a hydraulic boost device: a housing defining a pressure chamber therewithin, said housing having an inlet port communicated with a pressure source and an outlet port; operator-actuated valve means for controlling fluid communication between said inlet and outlet ports and between said inlet port and said pressure chamber; an accumulator in fluid communication with said pressure chamber for supplYing pressurized fluid to the latter after operation of said pressure source terminates; and second valve means for controlling fluid communication between said accumulator and said pressure chamber; said second valve means including means responsive to the fluid pressure level in said pressure chamber for maintaining said second valve means closed as the fluid pressure level communicated into said pressure chamber from said pressure source increases, said second valve means opening to communicate the accumulator to the pressure chamber upon actuation of said operator-actuated means after termination of operation of said pressure source.
Claim 2
Dependent Claim
152 words
In a hydraulic boost device: a housing defining a pressure chamber therewithin, said housing having an inlet port communicated with a pressure source and an outlet port; operator-actuated valve means for controlling fluid communication between said inlet and outlet ports and between said inlet port and said pressure chamber; an accumulator in fluid communication with said pressure chamber for supplYing pressurized fluid to the latter after operation of said pressure source terminates; and second valve means for controlling fluid communication between said accumulator and said pressure chamber; said second valve means including means responsive to the fluid pressure level in said pressure chamber for maintaining said second valve means closed as the fluid pressure level communicated into said pressure chamber from said pressure source increases, said second valve means opening to communicate the accumulator to the pressure chamber upon actuation of said operator-actuated means after termination of operation of said pressure source.
Claim 3
Dependent Claim
152 words
In a hydraulic boost device: a housing defining a pressure chamber therewithin, said housing having an inlet port communicated with a pressure source and an outlet port; operator-actuated valve means for controlling fluid communication between said inlet and outlet ports and between said inlet port and said pressure chamber; an accumulator in fluid communication with said pressure chamber for supplYing pressurized fluid to the latter after operation of said pressure source terminates; and second valve means for controlling fluid communication between said accumulator and said pressure chamber; said second valve means including means responsive to the fluid pressure level in said pressure chamber for maintaining said second valve means closed as the fluid pressure level communicated into said pressure chamber from said pressure source increases, said second valve means opening to communicate the accumulator to the pressure chamber upon actuation of said operator-actuated means after termination of operation of said pressure source.
Claim 4
Dependent Claim
152 words
In a hydraulic boost device: a housing defining a pressure chamber therewithin, said housing having an inlet port communicated with a pressure source and an outlet port; operator-actuated valve means for controlling fluid communication between said inlet and outlet ports and between said inlet port and said pressure chamber; an accumulator in fluid communication with said pressure chamber for supplYing pressurized fluid to the latter after operation of said pressure source terminates; and second valve means for controlling fluid communication between said accumulator and said pressure chamber; said second valve means including means responsive to the fluid pressure level in said pressure chamber for maintaining said second valve means closed as the fluid pressure level communicated into said pressure chamber from said pressure source increases, said second valve means opening to communicate the accumulator to the pressure chamber upon actuation of said operator-actuated means after termination of operation of said pressure source.
Claim 5
Dependent Claim
105 words
The invention of claim 1; and passage means communicating said accumulator with said pressure chamber; said second valve means including a pair of valve members slidably mounted in said passage means, one of said valve members being movable relative to the other valve member to permit communication from the accumulator into said pressure chamber, said valve members moving as a unit in said passage means as the fluid pressure level communicated into said pressure chamber from said pressure source is increased to prevent fluid pressure in said pressure chamber acting on said one valve member from moving the latter relative to the other valve member.
Claim 6
Dependent Claim
41 words
The invention of claim 2: stop means within said passage means; and resilient means yieldably urging said one valve member into sealing engagement with the other valve member and thereafter urging said valve members as a unit toward said stop means.
Claim 7
Dependent Claim
87 words
The invention of claim 2: the outer surface of said one valve member cooperating with the wall of the passage means to define an annular chamber therebetween in fluid communication with said accumulator and with said pressure chamber, said outer surface of said one valve member having a valve seating area thereon cooperating with said other valve member to control fluid communication between said annular chamber and said pressure chamber; and resilient means yieldably urging said valve seating area into sealing engagement with said other valve member.
Claim 8
Dependent Claim
70 words
The invention of claim 4: an annular seal carried by said housing engaging the outer surface of said one valve member to define a reaction chamber between said one valve member and the end of the housing, said annular seal preventing fluid communication between said annular chamber and said reaction chamber; and second passage means extending through said one valve member to communicate said pressure chamber to said reaction chamber.
Claim 9
Dependent Claim
40 words
The invention of claim 4: conduit means communicating said annular chamber with said inlet port; and check valve means permitting flow of fluid from said inlet port into said annular chamber, but preventing flow of fluid in the opposite direction.
Claim 10
Dependent Claim
39 words
The invention of claim 1; and conduit means communicating said accumulator with said inlet port; and check valve means permitting flow of fluid from said inlet port into said accumulator but preventing flow of fluid in the opposite direction.
Claim 11
Dependent Claim
48 words
The invention of claim 2: said one valve member including a portion projecting into said pressure chamber; said operator-actuated valve means including means for engaging said projecting portion upon actuation of said operator-actuated valve means and termination of fluid communication from said pressure source to said inlet port.
Claim 12
Dependent Claim
229 words
In a hydraulic boost device: a housing defining a pressure chamber therewithin, said housing having an inlet port communicated with a pressure source and an outlet port; an operator-actuated spool valve slidably mounted in said housing and extending into said pressure chamber, said spool valve being shiftable from a first position venting said pressure chamber to a fluid reservoir and communicating substantially all of the fluid flowing into said inlet port to the outlet port to a second position impeding flow of fluid between said inlet anD outlet ports and communicating a portion of the fluid flowing into said inlet port into said pressure chamber; an accumulator in fluid communication with said pressure chamber for supplying pressurized fluid to the latter after operation of said pressure source terminates; second valve means for controlling fluid communication between said accumulator and said pressure chamber; said second valve means including means responsive to the fluid pressure level in said pressure chamber for maintaining said second valve means closed as the fluid pressure level communicated into said pressure chamber from said pressure source increases; and means carried by the portion of the spool valve disposed in said pressure chamber for opening said second valve means to permit fluid communication from said accumulator into said reservoir after movement of the spool valve to said second position after termination of operation of said pressure source.
Claim 13
Dependent Claim
229 words
In a hydraulic boost device: a housing defining a pressure chamber therewithin, said housing having an inlet port communicated with a pressure source and an outlet port; an operator-actuated spool valve slidably mounted in said housing and extending into said pressure chamber, said spool valve being shiftable from a first position venting said pressure chamber to a fluid reservoir and communicating substantially all of the fluid flowing into said inlet port to the outlet port to a second position impeding flow of fluid between said inlet anD outlet ports and communicating a portion of the fluid flowing into said inlet port into said pressure chamber; an accumulator in fluid communication with said pressure chamber for supplying pressurized fluid to the latter after operation of said pressure source terminates; second valve means for controlling fluid communication between said accumulator and said pressure chamber; said second valve means including means responsive to the fluid pressure level in said pressure chamber for maintaining said second valve means closed as the fluid pressure level communicated into said pressure chamber from said pressure source increases; and means carried by the portion of the spool valve disposed in said pressure chamber for opening said second valve means to permit fluid communication from said accumulator into said reservoir after movement of the spool valve to said second position after termination of operation of said 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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |