Patent ID: 7931343
Filing Date: 2011-04-26
Classification: B60T

Abstract:
1. A motor vehicle parking brake with safety device for farm tractors, comprising: a braking structure mechanically connectable to at least one wheel of a vehicle; an electromechanical and hydraulic device comprised of an oil flow regulating valve assembly, a first control solenoid valve and a second safety solenoid valve, wherein the first control solenoid and the second safety solenoid are mounted in series; and said electromechanical and hydraulic device also comprises a hydraulic circuit, a hydraulic cylinder assembly comprising a chamber defined by a cylinder, a piston stressed by a pack of Belleville washers, housed inside the chamber; wherein upon actuation the cylinder assembly of the electromechanical and hydraulic device contacts the braking structure to exert a braking force upon the wheel; and wherein when the first control solenoid valve is set to an “ON” position and the safe solenoid valve is in an “OFF” position, a portion of said chamber is pressurized, and said piston moves to remove said braking structure from contacting the wheel and deactivate the parking brake.