Dual diaphragm actuator for a transmission throttle valve assembly

Claim 2

A control valve system for an automatic power transmission mechanism for use with an internal combustion engine having airfuel mixture intake manifold and an exhaust gas manifold, a control pressure pump driven by a torque delivery member of said transmission mechanism, multiple ratio gearing establishing plural torque delivery ratios between said engine and a driven member, fluid pressure operated clutch and brake means for controlling the relative motion of the elements of said gearing, pressure regulator valve means for controlling the operating pressure level of said pump, conduit structure connecting the regulated output pressure side of said regulator valve and said clutch and brake means including shift valve means, a throttle valve assembly for developing a pressure signal that is related in magnitude to the intake manifold pressure of said engine and a fluid connection between said throttle valve assembly and said regulator valve and between said throttle valve assembly and said shift valve, the throttle valve assembly comprising a throttle pressure modulator valve element, a diaphragm assembly comprising a large diaphragm and a smaller diaphragm connected together for movement in unison, a housing enclosing said diaphragms, a mechanical connection between said modulator valve element and said diaphragams, spring means for urging said diaphragms in one direction, the spring force acting one said diaphragms being transmitted to said modulator valve element to increase the modulated output pressure of said throttle valve assembly, said diaphragms and said housing defining a pair of manifold pressure chambers, one chamber being located between said diaphragms and the other pressure chamber being located on one side of said diaphragms, a separate intake manifold pressure passage extending to each chamber, and means for providing selected communication between one of said chambers and said intake manifold.

Claim 3

A control valve system for an automatic power transmission mechanism for use with an internal combustion engine having an air-fuel mixture intake manifold and an exhaust gas manifold, a control pressure pump driven by a torqUe delivery member of said transmission mechanism, multiple ratio gearing establishing plural torque delivery ratios between said engine and a driven member, fluid pressure operated clutch and brake means for controlling the relative motion of the elements of said gearing, pressure regulator valve means for controlling the operating pressure level of said pump, conduit structure connecting the regulated output pressure side of said regulator valve and said clutch and brake means including shift valve means, a throttle valve assembly for developing a pressure signal that is related in magnitude to the intake manifold pressure of said engine and a fluid connection between said throttle valve assembly and said regulator valve and between said throttle valve assembly and said shift valve, the throttle valve assembly comprising a throttle pressure modulator valve element, a diaphragm assembly comprising a large diaphragm and a smaller diaphragm connected together for movement in unison, a housing enclosing said diaphragms, a mechanical connection between said modulator valve element and said diaphragms, spring means for urging said diaphragms in one direction, the spring force acting on said diaphragms being transmitted to said modulator valve element to increase the modulated output pressure of said throttle valve assembly, said diaphragms and said housing defining a pair of manifold pressure chambers, one chamber being located between said diaphragms and the other pressure chamber being located on one side of said diaphragms, a separate intake manifold pressure passage extendng to each chamber, and means for providing selected communication between one of said chambers and said intake manifold, and means responsive to movement of said engine throttle to a closed throttle position for completing connections between said manifold and said one pressure chamber whereby the regulated output pressure of said throttle valve assembly is reduced.

Claim 4

A control valve system for an automatic power transmission mechanism for use with an internal combustion engine having an air-fuel mixture intake manifold and an exhaust gas manifold, a control pressure pump driven by a torqUe delivery member of said transmission mechanism, multiple ratio gearing establishing plural torque delivery ratios between said engine and a driven member, fluid pressure operated clutch and brake means for controlling the relative motion of the elements of said gearing, pressure regulator valve means for controlling the operating pressure level of said pump, conduit structure connecting the regulated output pressure side of said regulator valve and said clutch and brake means including shift valve means, a throttle valve assembly for developing a pressure signal that is related in magnitude to the intake manifold pressure of said engine and a fluid connection between said throttle valve assembly and said regulator valve and between said throttle valve assembly and said shift valve, the throttle valve assembly comprising a throttle pressure modulator valve element, a diaphragm assembly comprising a large diaphragm and a smaller diaphragm connected together for movement in unison, a housing enclosing said diaphragms, a mechanical connection between said modulator valve element and said diaphragms, spring means for urging said diaphragms in one direction, the spring force acting on said diaphragms being transmitted to said modulator valve element to increase the modulated output pressure of said throttle valve assembly, said diaphragms and said housing defining a pair of manifold pressure chambers, one chamber being located between said diaphragms and the other pressure chamber being located on one side of said diaphragms, a separate intake manifold pressure passage extendng to each chamber, and means for providing selected communication between one of said chambers and said intake manifold, and means responsive to movement of said engine throttle to a closed throttle position for completing connections between said manifold and said one pressure chamber whereby the regulated output pressure of said throttle valve assembly is reduced.

Claim 5

A control valve system for an automatic power transmission mechanism for use with an internal combustion engine having an air-fuel mixture intake manifold and an exhaust gas manifold, a control pressure pump driven by a torque delivery member of said transmission mechanism, multiple ratio gearing establishing plural torque delivery ratios between said engine and a driven member, fluid pressure operated clutch and brake means for controlling the relative motion of the elements of said gearing, pressure regulator valve means for controlling the operating pressure level of said pump, conduit structure connecting the regulated output pressure side of said regulator valve and said clutch and brake means including shift valve means, a throttle valve assembly for developing a pressure signal that is related in magnitude to the intake manifold pressure of said engine and a fluid connection between said throttle valve assembly and said regulator valve and between said throttle valve assembly and said shift valve, the throttle valve assembly comprising a throttle pressure modulator valve element, a diaphragm assembly comprising a large diaphragm and a smaller diaphragm connected together for movement in unison, a housing enclosing said diaphragms, a mechanical connection between said modulator valve element and said diaphragms, spring means for urging said diaphragms in one direction, the spring force acting on said diaphragms being transmitted to said modulator valve element to increase the modulated output pressure of said throttle valve assembly, said diaphragms and said housing defining a pair of manifold pressure chambers, one chamber being located between said diaphragms and the other pressure chamber being located on one side of said diaphragms, a separate intake manifold pressure passage extending to each chamber, and means for providing selected communication between one of said chambers and said intake manifold, upon establishment of an exhaust flow path between the engine exhaust manifold and said engine intake manifold.

Claim 6

A control valve system for an automatic power transmission mechanism for use with an internal combustion engine having an air-fuel mixture intake manifold and an exhaust gas manifold, a control pressure pump driven by a torque delivery member of said transmission mechanism, multiple ratio gearing establishing plural torque delivery ratios between said engine and a driven member, fluid pressure operated clutch and brake means for controlling the relative motion of the elements of said gearing, pressure regulator valve means for controlling the operating pressure level of said pump, conduit structure connecting the regulated output pressure side of said regulator valve and said clutch and brake means including shift valve means, a throttle valve assembly for developing a pressure signal that is related in magnitude to the intake manifold pressure of said engine and a fluid connection between said throttle valve assembly and said regulator valve and between said throttle valve assembly and said shift valve, the throttle valve assembly comprising a throttle pressure modulator valve element, a diaphragm assembly comprising a large diaphragm and a smaller diaphragm connected together for movement in unison, a housing enclosing said diaphragms, a mechanical connection between said modulator valve element and said diaphragms, spring means for urging said diaphragms in one direction, the spring force acting on said diaphragms being transmitted to said modulator valve element to increase the modulated output pressure of said throttle valve assembly, said diaphragms and said housing defining a pair of manifold pressure chambers, one chamber being located between said diaphragms and the other pressure chamber being located on one side of said diaphragms, a separate intake manifold pressure passage extending to each chamber, and means for providing selected communication between one of said chambers and said intake manifold, upon establishment of an exhaust flow path between the engine exhaust manifold and said engine intake manifold.

Claim 7

The combinAtion as set forth in claim 1 wherein said spring means acts upon the smaller of said diaphragms and is located in the pressure chamber located on said one side of said diaphragms, said diaphragms being connected together mechanically whereby the force of said spring is transmitted directly to said throttle valve element.

Claim 8

The combination as set forth in claim 2 wherein said spring means acts upon the smaller of said diaphragms and is located in the pressure chamber located on said one side of said diaphragms, said diaphragms being connected together mechanically whereby the force of said spring is transmitted directly to said throttle valve element.