Pneumatic valve return

Details Pneumatic valve return Pneumatic valve return

1984-10-15

1986-06-03

Lazarus, Ira S.

Internal-combustion engines

Poppet valve operating mechanism

Pneumatic system

123 9024, 123 9065, F01L 902

Patent

active

045923132

ABSTRACT:
A pneumatic valve return is disclosed for a cam-operated intake or exhaust valve of an internal combustion engine having a valve stem extending out of a cylinder head of the engine. The pneumatic valve return of the present invention provides a force acting to close the valve and operates to increase the force as the valve is opened. The pneumatic valve return includes a piston attached to the valve stem which is slidably fitted in a cylinder supported on the cylinder head about the valve stem. A chamber is thereby provided which is supplied with pressurized gas through a supply conduit to act on the piston to provide the closing force. A restriction in the supply conduit prevents rapid fluid escape from the chamber and, additionally, the supply conduct is isolated from the chamber to further prevent fluid escape when the valve has been partially opened by the actuation mechanism.

REFERENCES:
patent: 1474794 (1923-11-01), Shepherd
patent: 3120221 (1964-02-01), Lyons
patent: 3722483 (1973-03-01), Overby

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