Vehicle brake system
OwnerWilliam G. Fontaineinventor
Life of this patent
Estimating the term…
Abstract
A vehicle brake system, with the usual arrangement of a power booster axially aligned with the brake master cylinder piston and engaged between it and the brake pedal, has a fluid pressure differential-operated actuator offset from the conjoint axis of the power booster and the master cylinder piston. The actuator is coupled to the master cylinder piston through a mechanical linkage which provides a substantial mechanical advantage. The actuator causes the brakes to be applied independent of the brake pedal in response to any of several sensed conditions which dictate that the vehicle should not be moving.
Claims10
In a vehicle brake system having:
- a movable brake pedal;
- a master cylinder having a movable pressure-applying member therein for applying and releasing the vehicle brakes;
- a power booster acting between said brake pedal and said pressure-applying member in the master cylinder, said power booster having a pressure responsive member therein movable toward and away from said pressure-applying member in the master cylinder to produce corresponding movement of said pressure-applying member in the actuator to apply and release the brake;
- and reciprocable shaft means acting between said pressure responsive member in the power booster and said pressure-applying member in the master cylinder;
- the improvement which comprises:
- an actuator offset from said shaft means and having a member movable parallel to said shaft means:
- pivoted rigid lever means pivotally coupled separately to said shaft means and to said movable member in the actuator to displace said shaft means in response to movement of said movable member in the actuator:
- and means for causing movement of said movable member in the actuator in response to a pre-determined condition of the vehicle.
In a vehicle brake system having:
- a movable brake pedal;
- a master cylinder having a movable pressure-applying member therein for applying and releasing the vehicle brakes;
- a power booster acting between said brake pedal and said brake applying member in the master cylinder, said power booster having a pressure responsive member therein movable toward and away from said pressure-applying member in the master cylinder to effect corresponding movement of said pressure-applying member in the actuator to apply and release the brakes;
- and horizontally reciprocable shaft means acting between said pressure responsive member in the power booster and said pressure-applying member in the master cylinder;
- the improvement which comprises:
- a rigid lever pivotally coupled to said shaft means;
- pivotal support means for said lever above said shaft means;
- means providing a lost-motion coupling in said shaft means between said power booster and the pivotal coupling between said lever and said shaft means;
- an actuator located below said shaft means and having a displacement member movable parallel to said shaft means;
- means pivotally coupling said lever to said displacement member in said actuator;
- and means for causing movement of said displacement member, in response to a predetermined condition of the vehicle, to produce a corresponding movement of said pressure applying member in the master cylinder.
Dependencies are inferred from the claim text.