Engine with variable valve mechanism
AssigneeMechadyne PLC
InventorIan Methley
Life of this patent
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Abstract
An overhead camshaft internal combustion engine is disclosed having a valve mechanism which comprises an intake or exhaust poppet valve 14 having a valve stem operated by two cams 16 and 18 mounted for rotation about a common axis. A first rocker 20 mounted on a pivot shaft 26 acts between the first cam 16 and the valve 14. A second rocker 28 is mounted in the engine on a fixed pivot shaft 30 and acts between the second cam 18 and the pivot shaft 26 of the first rocker 20, to raise and lower the pivot point 26 of the first rocker 20 cyclically in synchronism with the rotation of the second cam 18.
Claims9
An overhead camshaft internal combustion engine having a valve mechanism which comprises
- an intake or exhaust poppet valve having a valve stem,
- two cams mounted for rotation about a common axis,
- a first rocker mounted on a pivot shaft and acting between the first cam and the valve stem, to open and close the poppet valve in synchronism with the rotation of the first cam, and
- a second rocker mounted in the engine on a fixed pivot shaft and acting between the second cam and the pivot shaft of the first rocker, to raise and lower the pivot point of the first rocker cyclically in synchronism with the rotation of the second cam.
Dependencies are inferred from the claim text.