Valve operating device for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShouji KATSUMATA, Hidetoshi HIROSE
Life of this patent
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Abstract
In an engine valve, a first sliding area formed at a valve head side in an outer face of a valve stem, and sliding along a stem guide, a second sliding area formed at an opposite side from the valve head side, and sliding along the stem guide, and a first small diameter area formed between the first sliding area and the second sliding area are formed. Further, in the engine valve, a length, in an axial direction of the valve stem, of the first sliding area abutting on the stem guide at a position where the engine valve is fully opened is longer as compared with a length, in the axial direction of the valve stem, of the second sliding area abutting on the stem guide at a position where the engine valve is fully closed.
Claims2
A valve operating device for an internal combustion engine, comprising:
- an engine valve comprising a valve stem portion and a valve head portion connected to one end of the valve stem portion, the valve stem portion including a cylindrical sliding area sliding along a stem guide and a first small diameter area having a smaller diameter as compared with a diameter of the sliding area;
- and
- a valve drive device driving the engine valve between a fully opened position where a lift amount of the valve head portion becomes maximum to an opening side, and a fully closed position where the lift amount becomes minimum,
- wherein the sliding area includes a first sliding area between the valve head portion and the first small diameter area, and a second sliding area between the first small diameter area and the other end of the valve stem portion, and
- a length in an axial direction of the first sliding area abutting on the stem guide at the fully opened position is longer as compared with a length in an axial direction of the second sliding area abutting on the stem guide at the fully closed position.
Dependencies are inferred from the claim text.