Patent US3729235A successfully refreshed from Google Patents.
US3729235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated brake booster and adaptive braking modulator
Assignee: Bendix Corp
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Filing: 1971-09-03
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Granted: 1973-04-24
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Expires: 1991-09-03
Abstract
Abstract A vehicle hydraulic braking system is disclosed which includes a single device which not only provides a power assist to the vehicle operator when the brakes are applied, but also serves as an adaptive braking modulator. The device includes a housing defining a pressure chamber therewithin, and a number of pistons, one piston for each control channel of the adaptive braking system, which are slidably mounted within the chamber. When the vehicle operator effects a brake application, a valve within the housing admits high pressure fluid from a pressure source into the pressure chamber for urging the pistons in a brake-applying direction. However, when the adaptive braking system senses an incipient skid condition at one of the vehicle''s wheels, pressures are equalized on the opposite ends of a corresponding one of the pistons, to thereby permit a spring to yieldably urge the piston in a brake release direction, thereby relieving the braking pressure in the affected brake.
Inventors
- 👤 L Bach
- 👤 R Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:11
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/44; B60T8/447; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/143; B60T8/321; B60T8/328; B60T8/40; B60T8/4004
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
143 words
In an integrated brake booster and adaptive braking modulator for a vehicle: a housing defining a chamber therewithin; piston means slidably mounted in said chamber and defining a pair of compartments therewithin between opposite ends of said piston means and corresponding ends of the chamber; operator-operated valve means for controlling fluid communication between a pressure source and one of said compartments to slide said piston means toward one end of said chamber; brake pressure developing means responsive to movement of said piston means toward said one end of said chamber to develop braking pressure in at least one of the brakes of the vehicle; and electrically operated valve means for communicating high pressure fluid into the other compartment to permit movement of the piston means toward the other end of said chamber to relieve the pressure developed by said brake pressure developing means.
Claim 2
Dependent Claim
143 words
In an integrated brake booster and adaptive braking modulator for a vehicle: a housing defining a chamber therewithin; piston means slidably mounted in said chamber and defining a pair of compartments therewithin between opposite ends of said piston means and corresponding ends of the chamber; operator-operated valve means for controlling fluid communication between a pressure source and one of said compartments to slide said piston means toward one end of said chamber; brake pressure developing means responsive to movement of said piston means toward said one end of said chamber to develop braking pressure in at least one of the brakes of the vehicle; and electrically operated valve means for communicating high pressure fluid into the other compartment to permit movement of the piston means toward the other end of said chamber to relieve the pressure developed by said brake pressure developing means.
Claim 3
Dependent Claim
98 words
The invention of claim 1; and first passage means communicating said other compartment with relatively high pressure fluid; second passage means communicating said other compartment with a fluid reservoir; said electrically operated valve means normally permitting fluid communication through said second passage means and preventing fluid communication through said second passage means and preventing fluid communication through said first passage means, but permitting fluid communication through said first passage means and preventing fluid communication through said second passage means upon actuation of said electrically operated valve means to relieve the pressure developed by said brake pressure developing means.
Claim 4
Dependent Claim
32 words
The invention of claim 2: said electRically operated valve means including a normally closed solenoid valve in said first passage means and a normally open solenoid valve in said second passage means.
Claim 5
Dependent Claim
17 words
The invention of claim 3: said first passage means communicating said other chamber with said one chamber.
Claim 6
Dependent Claim
37 words
The invention of claim 2; and an accumulator for storing fluid under pressure, said operator-operated valve means controlling communication between said accumulator and said one compartment; said first passage means communicating said other compartment with said accumulator.
Claim 7
Dependent Claim
112 words
The invention of claim 1: said brake pressure developing means including a bore defined within said housing having an outlet port communicated with a vehicle brake and an inlet port communicating said bore with a fluid container, and pressure generating means slidably mounted in said bore for generating pressure therein; and means interconnecting said pressure generating means and said piston means so that said pressure generating means moves with said piston means to generate braking pressure in said bore when said piston means is moved toward said one end of the chamber and to relieve braking pressure in said bore when the piston means moves toward the other end of the chamber.
Claim 8
Dependent Claim
20 words
The invention of claim 6; and resilient means yieldably urging said piston means toward said other end of the chamber.
Claim 9
Dependent Claim
80 words
The invention of claim 1; and means dividing said chamber into first and second sections; said piston means including a first piston slidably mounted in the first section of the chamber and a second piston slidably mounted in the second section of the chamber, said dividing means also dividing said other compartment into first and second sections corresponding to said first and second pistons, the fluid pressure in said one compartment acting on each of said first and second pistons.
Claim 10
Dependent Claim
136 words
The invention of claim 8: said brake pressure developing means including first and second bores defined within said housing, said bores each having outlet ports communicated to the brakes of the vehicle, inlet ports communicating each of said bores with a separate fluid container, and first and second pressure generating members slidably mounted in said first and second bores, respectively; and first means interconnecting said first piston with said first pressure generating members and second means interconnecting said second piston with said second pressure generating members, whereby braking pressure is generated in a corresponding one of said bores when the corresponding piston is moved toward said one end of the chamber and braking pressure is relieved in the corresponding one of said bores when the corresponding piston is moved toward the other end of said chamber.
Claim 11
Dependent Claim
107 words
The invention of claim 9: a cartridge slidably mounted in said housing, one end of said cartridge defining a portion of said other end of said chamber, said operator-operated valve means being mounted within said cartridge; and an operator-operated input rod extending into said housing and slidably received within said cartridge for operating said operator-operated valve means; said operator-operated input rod sliding said cartridge into engagement with said first and second pistons when a malfunction terminates fluid communication to said housing to provide a rigid link between said first and second pistons and said operator-operated input rod to permit manual operation of said first and second pistons.
Claim 12
Dependent Claim
25 words
The invention of claim 10; and a castor pivotally mounted on the one end of the cartridge for engagement with said first and second piston.
Claim 13
Dependent Claim
107 words
The invention of claim 8: a cartridge slidably mounted in said housing, one end of said cartridge defining a portion of said other end of said chamber, said operator-operated valve means being mounted within said cartridge; and an operator-operated input rod extending into said housing and slidably received within said cartridge for oPerating said operator-operated valve means; said operator-operated input rod sliding said cartridge into engagement with said first and second pistons when a malfunction terminates fluid communication to said housing to provide a rigid link between said first and second pistons and said operator-operated input rod to permit manual operation of said first and second pistons.
Claim 14
Dependent Claim
24 words
The invention of claim 12: a castor pivotally mounted on the one end of the cartridge for engagement with said first and second pistons.
Claim 15
Dependent Claim
86 words
The invention of claim 1: a cartridge slidably mounted in said housing, said operator-operated valve means being mounted within said cartridge; and an operator-operated input rod extending into said housing and slidably received within said cartridge for operating said operator-operated valve means; said operator-operated input rod sliding said cartridge into engagement with said piston means when a malfunction terminates fluid communication to said housing to provide a rigid link between said piston means and said operator-operated input rod to permit manual operation of said piston means.
Claim 16
Dependent Claim
39 words
The invention of claim 14: one end of said cartridge defining a portion of said other end of said chamber, whereby fluid pressure in said chamber acting on said one end of the cartridge prevents movement of the latter.
Claim 17
Dependent Claim
82 words
The invention of claim 14: said fluid pressure source being an accumulator, said operator-operated valve means including a valve shiftable from a first position preventing fluid communication between said accumulator and said one compartment and permitting fluid communication between said one compartment and a fluid reservoir to a second position terminating fluid communication between the one compartment and the reservoir and permitting fluid communication between the accumulator and said one compartment, and resilient means yieldably urging said valve toward the first position.
Claim 18
Dependent Claim
121 words
The invention of claim 14: said housing having an inlet port communicated to said pressure source, an outlet port, and a return port communicated to a fluid reservoir; said operator-operated valve means including a valve shiftable from a first position permitting substantially uninhibited fluid communication between said inlet and outlet ports and venting said one compartment to said return port to a second position terminating communication between said one chamber and the return port, restricting flow of fluid between the inlet and outlet ports to increase the fluid pressure level at the inlet port, and communicating said increased fluid pressure level at the inlet port to said one compartment and resilient means yieldably urging said spool valve to said first position.
Claim 19
Dependent Claim
76 words
The invention of claim 1: said pressure source being an accumulator; said operator-operated valve means being shiftable from a first position preventing communication between said accumulator and the one compartment and venting the latter to a fluid reservoir to a second position terminating fluid communication between the one compartment and the reservoir and initiating fluid communication between the one compartment and the accumulator, and resilient means yieldably urging said operator-operated valve means to said first position.
Claim 20
Dependent Claim
122 words
The invention of claim 1: said housing having an inlet port communicated to said pressure source, an outlet port, and a return port communicated to a fluid reservoir; said operator-operated valve means being shiftable from a first position permitting substantially uninhibited fluid communication between said inlet and outlet ports and venting said one compartment to said return port to a second position terminating fluid communication between said one chamber and the return port and restricting flow of fluid between the inlet and outlet ports to increase the fluid pressure level at the inlet port and communicating said increased fluid pressure level at the inlet port to said one compartment, And resilient means yieldably urging said operator-operated valve means to said first position.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |