Patent ID: 9086030
Filing Date: 2015-07-21
Classification: F02B,F02F,F05C,F16J

Abstract:
1. A piston for an internal combustion engine comprising; a crown portion provided at an upper end of the piston; and a skirt portion extending downward from the crown portion, wherein when the piston slides along a cylinder inner surface, a high surface pressure portion occurs at a center of the skirt portion and low surface pressure portions occur at both sides of the high surface pressure portion, wherein the high surface pressure portion is provided with horizontal grooves extending in a direction orthogonal to a direction of motion of the piston; wherein the horizontal grooves are spaced apart from one another by resin coated surfaces; and the low surface pressure portions are provided with inclined grooves that are inclined downward toward the high surface pressure portion and that are connected to end portions of respective horizontal grooves.