STRUCTURE OF SLIDING CONTACT PART OF INTERNAL COMBUSTION ENGINE AND ITS FORMING METHOD

摘要

PURPOSE: To improve the life of a cylinder by preventing a plated layer formed on the inner periphery of a cylinder body from peeling off easily from the base material of the inner periphery, and also preventing a piston body composing the piston from unnecessary wear when the piston is brought into slide contact with the inner periphery of the cylinder body. CONSTITUTION: A cylinder 6 has a cylinder body 7 and a piston 12 fitted axially slidably in the cylinder body 7. A plated layer is formed on the inner periphery 31 of the cylinder body 7 in a sliding contact part 32 between the inner periphery 31 of the cylinder body 7 and the piston 12. The thickness of the end edge of the plated layer on the side of a crankshaft 4 is gradually decreased with advance toward the crankshaft 4.