Patent ID: 6832632
Filing Date: 2004-12-21
Classification: F16H,Y10T

Abstract:
A replacement boost valve assembly for use in combination with a pressure regulator valve assembly wherein the boost valve assembly is disposed in fluid communication with a plurality of hydraulic circuits within the valve body of an automatic transmission, said boost valve assembly comprising:a generally cylindrical valve sleeve disposed in the valve body in coaxial relation to the pressure regulator valve assembly; a torque signal valve piston disposed in said valve sleeve in fluid communication with a torque signal fluid circuit, said torque signal valve piston having an increased axial length in comparison to the original equipment torque signal valve piston without a corresponding increase in the overall axial length of said boost valve assembly, a park/reverse/neutral valve piston disposed in fluid communication with a park/reverse/neutral fluid circuit, said park/reverse/neutral valve piston being positioned intermediate said torque signal valve piston and the pressure regulator valve; and at least one compression spring disposed intermediate said torque signal valve piston and said park/reverse/neutral valve piston in coaxial relation thereto, said compression spring biasing said torque signal valve piston to a closed position, said torque signal valve piston transferring the force generated by fluid pressure from said torque signal fluid circuit to the pressure regulator valve during high load conditions.