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US 2013/0220113 A1Published application
Cylinder formed with uneven pattern on surface of inner wall
AssigneeDoosan Infracore Co., Ltd.
InventorSung Gi Kim
Life of this patent
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Abstract
The present disclosure relates to a cylinder having an inner wall formed with fine uneven patterns to improve durability. The fine uneven patterns according to the present disclosure increases oil film pressure between a piston ring and an inner wall of the cylinder, and smoothly supplies engine oil to where the engine oil is insufficient, thereby reducing abrasion between the piston ring and the inner wall of the cylinder.
Claims10
A cylinder which is configured to guide movement of a piston, the cylinder comprising:
- a plurality of uneven patterns formed on the inner wall of the cylinder, wherein the plurality of uneven patterns are formed in at least a part of a region of a length region that is 5 to 50% of a stroke length section of the piston from a top dead center (TDC).
Dependencies are inferred from the claim text.