Variable valve actuating mechanism with summation cam
AssigneeMechadyne PLC
InventorsIan Methley, Nicholas Lawrence
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Abstract
A mechanism for actuating a poppet valve (28) of an internal combustion engine, comprises two coaxially mounted cams (12,14), cam followers (18,20) in contact with the respective cams (12,14) mounted on a common summation lever (16) which is movable in proportion to the instantaneous sum of the lifts of the two cams (12,14), and a rocker (24) pivotably connected to the summation lever (16) and serving to open the engine valve (28). The rocker is pivotable about a pivot (126) having a fixed preset position and a control spring (134) is provided between the summation lever (16) and a fixed point on the engine to urge the rocker (24) into contact with the tip of the valve (28) and the pivot (126) while the valve is closed.
Claims17
A mechanism for actuating a poppet valve of an internal combustion engine, comprising:
- two coaxially mounted cams, each having a cam profile;
- cam followers in at least intermittent contact with the respective cams
- a common summation lever which is movable in proportion to the instantaneous sum of the lifts of the two cams, the cam followers being coupled to the common summation lever;
- a rocker pivotably connected to the common summation lever and serving to open the poppet valve;
- the rocker being pivotable about a pivot having a preset position;
- and,
- a control spring coupled to the summation lever and to a fixed point on the engine, to urge the rocker against a portion of the poppet valve and the pivot while the poppet valve is closed.
Dependencies are inferred from the claim text.