Variable valve train
AssigneeHonda Motor Co., Ltd.
InventorsYoshihiro Takada, Dai Kataoka, Kazunori Kikuchi
Life of this patent
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Abstract
A variable valve train is provided with cylindrical cam carriers axially slidably and co-rotatably supported on camshafts. The cam carriers have thereon, respectively, plural cam lobes different in cam profile and axially adjacent to each other. Cam changeover mechanisms are provided for axially shifting the cam carriers and for changing over the cam lobes for operating on engine valves. At least one of the cam changeover mechanisms is disposed between axes of the two camshafts and on the side of an engine crankshaft relative to the axes.
Claims16
A variable valve train of an internal combustion engine, comprising:
- two camshafts rotatably supported in a cylinder head of the internal combustion engine;
- a crankshaft for the engine;
- cylindrical cam carriers coaxially surrounding the camshafts, respectively, to be rotatable with and axially slidable relative to the camshafts, the cam carriers having thereon a plurality of cam lobes for operating engine valves and being different in cam profile and axially adjacent to each other;
- and
- cam changeover mechanisms for axially shifting the cam carriers to change over the cam lobes for operating the engine valves,
- wherein the cam changeover mechanisms include respectively:
- changeover pins provided for advancing and retracting movements for fitting engagement with and disengagement from lead grooves formed around the cam carriers;
- and
- changeover driving shafts provided with cam mechanisms for operating the changeover pins to advance and retract for fitting engagement with and disengagement from the lead grooves,
- wherein the cam lobes are operable to act on the engine valves by way of rocker arms, and
- wherein the rocker arms are rockably supported on the changeover driving shafts.
Dependencies are inferred from the claim text.