Piston for internal combustion engine
First Claim
1. A piston for an internal combustion engine, comprisinga sliding part having a sliding section which is in slidable contact with an opposite member in presence of a lubricating oil;
- anda hard carbon thin film coated on the sliding section of the sliding part,wherein the lubricating oil comprises at least one friction modifier selected from the group consisting of an ashless fatty acid ester friction modifier and an ashless aliphatic amine friction modifier, the at least one friction modifier having a C6-C30 straight or branched hydrocarbon chain and being contained in an amount of 0.05 to 3.0% by mass based on a total mass of the lubricating oil; and
wherein the hard carbon thin film contains hydrogen atoms in an amount of not more than 1 atomic %.
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Accused Products
Abstract
A piston for an internal combustion engine of an automotive vehicle. The piston has a piston ring and a piston skirt section each of which has a sliding section in slidable contact with a cylinder bore section of a cylinder block in presence of a lubricating oil. The cylinder bore section is formed of eutectic or hyper-eutectic aluminum alloy. Additionally, a hard carbon thin film is coated on the sliding section of the piston and contains hydrogen atom in an amount of not more than 1 atomic %. Here, the lubricating oil contains at least one selected from the group consisting of ashless fatty acid ester friction modifier, ashless aliphatic amine friction modifier, polybutenyl succinimide, derivative of polybutenyl succinimide, zinc dithiophosphate, and derivative of zinc dithiophosphate.
389 Citations
35 Claims
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1. A piston for an internal combustion engine, comprising
a sliding part having a sliding section which is in slidable contact with an opposite member in presence of a lubricating oil; - and
a hard carbon thin film coated on the sliding section of the sliding part, wherein the lubricating oil comprises at least one friction modifier selected from the group consisting of an ashless fatty acid ester friction modifier and an ashless aliphatic amine friction modifier, the at least one friction modifier having a C6-C30 straight or branched hydrocarbon chain and being contained in an amount of 0.05 to 3.0% by mass based on a total mass of the lubricating oil; and wherein the hard carbon thin film contains hydrogen atoms in an amount of not more than 1 atomic %. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
- and
Specification