Valve operating system for engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsNaoki Takahara, Toshiyuki Sato
Life of this patent
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Abstract
A lost motion mechanism that biases a free rocker arm of a lift-amount changing member capable of lifting a valve in a direction to abut against a cam includes a spring accommodated in a support portion. The support portion is a recessed portion integrally formed on a camshaft holder below the free rocker arm. The vertical dimension of an engine is reduced as compared with a case where the support portion is provided above the free rocker arm. A camshaft cap supports the camshaft and a bolt that fastens the camshaft cap to the camshaft holder are not required.
Claims13
A valve operating system for an engine, comprising:
- a camshaft axially inserted into a camshaft holder formed in a cylinder head;
- a rocker arm driven by said camshaft;
- and
- a valve driven by said rocker arm,
- wherein said camshaft holder is integrally formed with a biasing member support portion to bias said rocker arm toward said camshaft or toward said valve.
A valve operating system for an engine, comprising:
- a camshaft axially inserted into a camshaft holder formed in a cylinder head;
- a valve driven by said camshaft;
- and
- a lift-amount changing means for changing a lift amount of said valve,
- wherein said lift-amount changing means includes a free rocker arm adapted to abut against a first cam, a biasing member that biases said free rocker arm in a direction to abut against said first cam, a driving rocker arm adapted to abut against a second cam to drive said valve, and a connection switchover mechanism for connecting or disconnecting said free rocker arm and said driving rocker arm, and
- wherein said camshaft holder, below said free rocker arm, is integrally provided with a biasing member support portion.
Dependencies are inferred from the claim text.