Geared rocker valve operation for internal combustion reciprocat

Details Geared rocker valve operation for internal combustion reciprocat Geared rocker valve operation for internal combustion reciprocat

1996-02-13

1998-03-31

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Valve driven closed

123 9039, F01L 130

Patent

active

057326703

ABSTRACT:
An improved design for pushrod operated internal combustion type engines. This invention eliminates the valve spring altogether. In current engines of this type a cam lobe provides the positive upward force to the system to open an intake or exhaust valve and a valve spring provides the constant force to close the valve. This invention uses two cam lobes, an open cam lobe 22 and a close cam lobe 23; two pushrods, and open pushrod 24 and a close pushrod 25; and two geared rockers, a open geared rocker 26 and a close geared rocker 27. A valve stem box retainer 32 is required to pull the valve into a closed position. Positive upward force from the cam shaft is used to both open and close an intake or exhaust valve. The key is that only one of the cam shaft lobes drives the system at a time. If the close valve cam lobe 21 is providing the upward force to close the valve than the open valve cam lobe 20 is not engaged. Since the open and close rockers are geared and engaged into each other, the lifter/pushrod/rocker combination that is not actively driving the valve is controlled by the one that is.

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Chevrolet Power By General Motors 2nd Edition page 86 Feb. 1994.

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