Cylinder head with valve deactivators
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United States of America Patent
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Apr 23, 2019
Grant Date -
Mar 29, 2018
app pub date -
Sep 28, 2016
filing date -
Sep 28, 2016
priority date (Note) -
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Abstract
To improve fuel efficiency, some gasoline engines are equipped with valve deactivators in some of the cylinders so that at low torque conditions only a subset of the total number of cylinders are active. In prior art engines, particularly when they have four valves per cylinder, space is tight. It is known to provide a cam carrier in the head between the cylinder head and the camshaft. The cylinder head bolts pass through the head under the cam carrier. According to the present disclosure, the cam carrier, and its associated disadvantages, is obviated by widening the bearings for the camshafts, using smaller diameter head bolts, and putting the orifices for the head bolts directly through the bearings.
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