Abstract:
The invention relates to an operating device for a vehicle braking system comprising a master-cylinder and a set of wheel brakes. The device comprises a hydraulic portion having an annular boost piston and a mechanical portion connected to an energy accumulator device having a coil spring. The mechanical portion includes two pivoting arms, one of which being a lever cooperative with said boost piston by the intermediary of a push rod. The lever rotates around a pivot fixed to the support of the device and is pivotally secured to the other arm which consists of a link provided with a sliding pivot secured to another push rod biased by the energy accumulator device. The sliding pivot comprises a roller moving between two plane surfaces upon rotation of the two arms. The structure of the mechanical portion being such that, upon a checkwise rotation of the link, the energy accumulator device is unlocked when the axis of pivotment joining the link to the lever passes through the plane comprising the fixed and sliding pivots.
Abstract:
The invention relates to an operating device for a vehicle braking system comprising a master-cylinder and a set of wheel brakes. The device comprises a hydraulic portion having an annular boost piston and a mechanical portion connected to an energy accumulator device having a coil spring. The mechanical portion includes two pivoting arms, one of which cooperates with said boost piston by the intermediary of a rod whose free end projects through an annular unlocking piston. When pressure in the master-cylinder reaches a predetermined value, the unlocking piston shifts towards the left of the figure thereby causing fluid-tight engagement between boost piston and a shoulder provided on the rod, and unlocking the energy accumulator device by rotation of the arms. Upon release of the master-cylinder, fluid flowing back from the wheel brakes biases the boost piston to the right until the different parts of the device reach a position in which the energy accumulator device is again locked.
Abstract:
An electronic anti-skid device for a vehicle braking system, operative upon actuation of the brake pedal to periodically apply the brakes and isolate the braking system from the brake pedal under the control of signals representative of the wheel acceleration. During the periods when the braking system is isolated, the wheel acceleration curve comprises a negative portion followed by a positive portion having a peak value. With this device, the periods when the braking system is isolated are ending shortly after the wheel acceleration has reached its peak value. This is obtained by comparing the positive portion of the acceleration signal with the output signal of a time-constant circuit having a discharge curve which intersects the acceleration curve in the neighborhood of the peak value.