초록 ▼

Braking unit for vehicle, of the type comprising an axial actuating helical spring maintained in release position, against its elastic reaction force, through a screw-nut system rotatively driven by an electric motor, the spring acting upon the brake through the intermediary of a hydraulic master cy

Braking unit for vehicle, of the type comprising an axial actuating helical spring maintained in release position, against its elastic reaction force, through a screw-nut system rotatively driven by an electric motor, the spring acting upon the brake through the intermediary of a hydraulic master cylinder of which the piston is axially connected to an abutment ring of the spring also mechanically connected, via a screw-nut system to the rotor of an electric motor, such an unit being applied to a spring braking system for a vehicle possibly with a built-in park brake.

대표청구항 ▼

A braking unit for a vehicle, of the type comprising at least one helical spring arranged to axially actuate a brake, said spring being maintained in a brake release position against its reaction force via a screw-nut system adapted to be driven in rotation by an electric motor which is powered to a

A braking unit for a vehicle, of the type comprising at least one helical spring arranged to axially actuate a brake, said spring being maintained in a brake release position against its reaction force via a screw-nut system adapted to be driven in rotation by an electric motor which is powered to adjust the braking force of the unit, constituted by the axial reaction force of the spring reduced by the subtractive force produced by the screw-nut system rotationally driven by the electric motor, the spring being connected to the brake through the intermediary of at least a hydraulic master cylinder, the piston of which is axially activated by an abutment ring of the spring, the abutment ring being mechanically connected via the screw-nut system to the rotor of the electric motor and the master cylinder being branched to at least one receiving cylinder, piston of which is adapted to apply at last one brake lining the brakes on a braking surface of the vehicle, the abutment ring being also mechanically connected to a mechanism for actuating an emergency or park brake of the vehicle adapted to replace at last provisionally the master cylinder if it becomes defective, wherein the mechanical connection between the abutment and the actuating mechanism is constituted by a lever articulated on an axle integral with the unit body and one end of which rests upon the end abutment ring of the actuating spring while the other end is connected to a cable of a cable and sheath system for actuating the emergency or park brake, wherein the sheath is respectively adapted, in the application position of the emergency or park brake, to abut a rigid abutment and, in the inactive position of the emergency or park brake, to be released in order to allow the service brake to act freely via the hydraulic master cylinder and wherein the rigid abutment is movable and adapted either to be returned to the active position or to be brought into the inactive position, thereby releasing the sheath, by a remotely controlled member.