US3689121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling braking force in a wheel brake system on a powered vehicle
Assignee: Aisin Corp
•
Filing: 1970-08-25
•
Granted: 1972-09-05
•
Expires: 1990-08-25
Abstract
Abstract An improved process and apparatus for controlling the hydraulic brake pressure for actuating the front and rear wheel brakes of an automotive vehicle to prevent simultaneous locking thereof upon sudden application of the vehicle brake actuating pedal by providing a hydraulic pressure limiter in the hydraulic conduit between the brake master cylinder and a selected pair of vehicle wheels, with the hydraulic pressure limiter, in turn, being connected with a brake pressure signal generating device attached to the remaining vehicle wheel pair for controlling the brake applied pressure of the selected wheel pair in response to the braking effort of the other wheel pair. The hydraulic pressure limiter unit is also operatively connected with a member of the vehicle chassis and responsive to the relative movement of the chassis member resulting from the braking action to vary the pressure applied to the selected wheel pair to prevent simultaneous locking of the front and rear vehicle wheels.
Inventors
- 👤 Tsuneo Kawabe
- 👤 Kouichi Suzuki
- 👤 Hirotaka Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:42
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/52; B60T8/17; B60T8/176; B60T8/1766; B60T8/18; B60T8/1837; B60T8/185; B60T8/26; B60T8/266; Y; Y10; Y10S; Y10S188/00; Y10S188/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
389 words
A brake pressure limiting system for controlling the braking force of a first set of vehicle wheel brakes in response to a brake reaction force of a second set of vehicle wheel brakes comprising in combination: a hydraulic master cylinder assembly for apPlying a hydraulic braking pressure to said first and second sets of vehicle wheel brakes in response to actuation by a vehicle operator, first conduit means hydraulically connecting said master cylinder assembly with hydraulic actuating means of said first set of vehicle wheel brakes, second conduit means hydraulically connecting said master cylinder assembly with hydraulic actuating means of said second set of vehicle wheel brakes, a hydraulic pressure limiter assembly connected in said first conduit means between said master cylinder assembly and said hydraulic actuating means of said first set of vehicle wheel brakes, said pressure limiter assembly including a housing rigidly mounted on a suspended portion of said vehicle, said housing having a cylindrical bore therein slidably containing a piston means, said piston means forming a first and a second chamber in said bore, said first chamber communicating with said master cylinder assembly and said second chamber communicating with the hydraulic actuating means of said first vehicle wheel brakes, passage means communicating said first chamber with said second chamber, said piston means having a valve means for controlling hydraulic communication between said first and second chamber in response to the position of said piston means, brake force reaction means operatively connected to said second set of vehicle wheel brakes for generating a signal in response to an increase in the brake reaction force on said second set of vehicle wheels, said hydraulic pressure limiter assembly being operatively connected with said brake force reaction means for controlling the movement of said piston means in response to said signal, said valve means being moved in the direction of said first chamber by said piston means in response to a decrease in the signal from said brake force reaction means to block communication of said master cylinder assembly with the hydraulic actuating means of said first set of vehicle wheel brakes, whereby, upon an impending locking condition of said second set of vehicle brakes, the hydraulic pressure applied to said first set of vehicle brakes is reduced to prevent said first set of vehicle wheel brakes from becoming locked.
Claim 2
Dependent Claim
389 words
A brake pressure limiting system for controlling the braking force of a first set of vehicle wheel brakes in response to a brake reaction force of a second set of vehicle wheel brakes comprising in combination: a hydraulic master cylinder assembly for apPlying a hydraulic braking pressure to said first and second sets of vehicle wheel brakes in response to actuation by a vehicle operator, first conduit means hydraulically connecting said master cylinder assembly with hydraulic actuating means of said first set of vehicle wheel brakes, second conduit means hydraulically connecting said master cylinder assembly with hydraulic actuating means of said second set of vehicle wheel brakes, a hydraulic pressure limiter assembly connected in said first conduit means between said master cylinder assembly and said hydraulic actuating means of said first set of vehicle wheel brakes, said pressure limiter assembly including a housing rigidly mounted on a suspended portion of said vehicle, said housing having a cylindrical bore therein slidably containing a piston means, said piston means forming a first and a second chamber in said bore, said first chamber communicating with said master cylinder assembly and said second chamber communicating with the hydraulic actuating means of said first vehicle wheel brakes, passage means communicating said first chamber with said second chamber, said piston means having a valve means for controlling hydraulic communication between said first and second chamber in response to the position of said piston means, brake force reaction means operatively connected to said second set of vehicle wheel brakes for generating a signal in response to an increase in the brake reaction force on said second set of vehicle wheels, said hydraulic pressure limiter assembly being operatively connected with said brake force reaction means for controlling the movement of said piston means in response to said signal, said valve means being moved in the direction of said first chamber by said piston means in response to a decrease in the signal from said brake force reaction means to block communication of said master cylinder assembly with the hydraulic actuating means of said first set of vehicle wheel brakes, whereby, upon an impending locking condition of said second set of vehicle brakes, the hydraulic pressure applied to said first set of vehicle brakes is reduced to prevent said first set of vehicle wheel brakes from becoming locked.
Claim 3
Dependent Claim
143 words
A brake pressure limiting system as defined in claim 1 wherein said brake force reaction means comprises a hydraulic piston and cylinder assembly operatively connected to said second set of vehicle wheel brakes for generating a hydraulic pressure in response to an increase in the brake reaction force on said second set of vehicle wheel brakes, and third conduit means hydraulically communicating said hydraulic piston and cylinder assembly with said pressure limiter assembly, said piston means of said hydraulic pressure limiter assembly being moved in the direction of said second chamber in response to an increase in the pressure from said third conduit means to maintain said valve means in its open position, said valve means being moved to its closed position by the application of hydraulic pressure from said master cylinder upon the decrease in hydraulic pressure in said third conduit means.
Claim 4
Dependent Claim
82 words
A brake pressure limiter system as defined in claim 1 wherein said brake force reaction means comprises means for generating an electrical signal in response to an increase in the brake reaction force of said second set of vehicle wheel brakes, and electrically actuated solenoid means operatively connected to said pressure limiter means for maintaining said piston means in the direction of said second chamber, said electrically actuated solenoid means being operatively connected to said electrical signal generating means and actuated thereby.
Claim 5
Dependent Claim
95 words
A pressure limiting system as defined in claim 1 further comprising check means for maintaining said valve means in its open position to communicate said first chamber with said second chamber upon the failure of application of said brake reaction signal from said brake force reaction means, said Check means comprising an auxiliary laterally movable piston contained in a lateral bore formed in said housing, said auxiliary lateral piston being moved radially outwardly from said piston means upon the application of said signal from said brake force reaction means to said hydraulic pressure limiter assembly.
Claim 6
Dependent Claim
154 words
A brake pressure limited system as defined in claim 4 wherein said check means is movable between its operating and off-service positions during the sliding movement of said piston means, wherein when said check means is maintained in its operating position the sliding movement of said piston means in a direction away from said second chamber is prevented and hydraulic pressure is communicated between said first and second chambers to said hydraulic actuating means of said first set of vehicle wheel brakes without being subjected to modification, and when said check means is maintained in its non-service position said piston means is slidable in the direction away from said second chamber to cause said valve means to block communication through said passage means, whereby the master cylinder pressure applied to said first set of vehicle wheel brakes is reduced at a predetermined ratio to provide a properly controlled hydraulic pressure to be delivered thereto.
Claim 7
Dependent Claim
76 words
A brake pressure limiter system as defined in claim 1 further comprising vehicle load responsive means operatively connected to said piston means of said hydraulic pressure limiter assembly to move said piston means in the direction of said second chamber in response to an increase in the load of said vehicle, whereby said hydraulic brake pressure applied to said first set of vehicle wheel brakes is modified in accordance with the loading conditions of the vehicle.
Claim 8
Dependent Claim
78 words
A brake pressure limiter system as defined in claim 6 wherein said vehicle load responsive means comprises a mechanical linkage operatively connected between said piston means and an unsprung portion of said vehicle, said mechanical linkage changing the position of said piston means in response to a change in the distance between the suspended portion of the vehicle to which said hydraulic pressure limiter assembly is mounted and the unsprung portion to which said mechanical linkage is connected.
References Cited (Backward Citations)
US3008548A
Cited
US3305051A
Cited
US3371754A
Cited
US3410608A
Cited
US3368651A
Cited
US3434572A
Cited
DE1914336A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |