US4395883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric brake booster
Assignee: Motors Liquidation Co
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Filing: 1980-12-22
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Granted: 1983-08-02
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Expires: 2000-12-22
Abstract
Abstract The brake pedal force is amplified by an electric motor acting through a gear set which converts rotary motion and torque from the motor into linear motion and force to energize the master cylinder piston. The push rod forces are sensed, amplified, reduced and modulated by electronic means. The electric motor disengages from the gear set at rest or if there is an electrical failure, so that there is a manual mode of operation available when necessary.
Inventors
- 👤 Wolfgang Melinat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:31
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/74; B60T13/745; B60T7/00; B60T7/02; B60T7/04; B60T7/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
302 words
An electrically controlled and powered brake booster and master cylinder assembly comprising: a master cylinder actuatable to generate hydraulic brake actuating pressures commensurate with the amount of force delivered thereto; a master cylinder actuator including a brake pedal for manual operation, and push rod means connecting said brake pedal to said master cylinder to deliver manually generated force from said brake pedal to said master cylinder, said push rod means having force sensing means sensing the force exerted from said brake pedal on said push rod means and generating force responsive signals signifying the strength and rate of change of the force exerted from said brake pedal on said push rod means, said push rod means including a force transmitting section between said master cylinder and said force sensing means and movable linearly to actuate and release said master cylinder; driving means connected to said force transmitting section for selectively driving said force transmitting section and including an electric motor having a rotatable output shaft, clutch means between said electric motor output shaft and said force transmitting section and having clutch engaging and disengaging means operatively sensitive to said force responsive signals to engage said clutch means only at and above a predetermined minimum force sensed by said force sensing means, and means sensing the rotational movement of the output shaft of said electric motor and generating rotation responsive signals accordingly; and control logic means receiving said force and rotation responsive signals and controlling said clutch engaging and disengaging means and said electric motor to use the power of said electric motor to drive said force transmitting section in accordance with the strength and rate of change of the force from said brake pedal and rotational characteristics of said motor output shaft to boost the manually generated force actuating said master cylinder.
Claim 2
Dependent Claim
302 words
An electrically controlled and powered brake booster and master cylinder assembly comprising: a master cylinder actuatable to generate hydraulic brake actuating pressures commensurate with the amount of force delivered thereto; a master cylinder actuator including a brake pedal for manual operation, and push rod means connecting said brake pedal to said master cylinder to deliver manually generated force from said brake pedal to said master cylinder, said push rod means having force sensing means sensing the force exerted from said brake pedal on said push rod means and generating force responsive signals signifying the strength and rate of change of the force exerted from said brake pedal on said push rod means, said push rod means including a force transmitting section between said master cylinder and said force sensing means and movable linearly to actuate and release said master cylinder; driving means connected to said force transmitting section for selectively driving said force transmitting section and including an electric motor having a rotatable output shaft, clutch means between said electric motor output shaft and said force transmitting section and having clutch engaging and disengaging means operatively sensitive to said force responsive signals to engage said clutch means only at and above a predetermined minimum force sensed by said force sensing means, and means sensing the rotational movement of the output shaft of said electric motor and generating rotation responsive signals accordingly; and control logic means receiving said force and rotation responsive signals and controlling said clutch engaging and disengaging means and said electric motor to use the power of said electric motor to drive said force transmitting section in accordance with the strength and rate of change of the force from said brake pedal and rotational characteristics of said motor output shaft to boost the manually generated force actuating said master cylinder.
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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |