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US 8,069,773 B2Granted
Piston
AssigneesToyota Jidosha Kabushiki Kaisha, Art Metal Mfg. Co., Ltd.
InventorsTakao Suzuki, Shoji Kanai
Life of this patent
Estimating the term…
Abstract
A piston is equipped with a skirt that has a sliding surface provided with an oil repellent resin layer. A solid lubricating resin layer and the oil repellent resin layer are exposed on the sliding surface. On the sliding surface, the oil repellent resin layer extends at an incline with respect to the centerline of the sliding surface in a circumferential direction of the piston.
Claims10
A piston for use in an internal combustion engine, comprising:
- a skirt having a sliding surface coated with an oil repellent resin layer, wherein:
- the oil repellent resin layer extends at an incline with respect to a sliding surface centerline in a circumferential direction of the piston,
- a solid lubricating resin layer and the oil repellent resin layer are exposed on the sliding surface, and
- the oil repellent resin layer exhibits higher oil repellency than the solid lubricating resin layer.
1 more element
A piston for use in an internal combustion engine, comprising:
- a skirt having a sliding surface coated with an oil repellent resin layer, wherein:
- the oil repellent resin layer extends at an incline with respect to a sliding surface centerline in a circumferential direction of the piston,
- a guide groove is formed in the sliding surface,
- the guide groove extends at an incline with respect to the sliding surface centerline from a sliding surface circumferential end portion toward a sliding surface central portion to introduce lubricating oil from the sliding surface circumferential end portion to the sliding surface central portion,
- the oil repellent resin layer is exposed along at least part of the bottom of the guide groove,
- the sliding surface is constructed by superimposing a plurality of resin layers over a base material of the piston,
- the oil repellent resin layer is provided directly over the base material,
- a solid lubricating resin layer is provided directly over the oil repellent resin layer,
- the guide groove is formed in the solid lubricating resin layer, and
- the oil repellent resin layer is exposed along the bottom of the guide groove.
7 more elements
A piston for use in an internal combustion engine, comprising:
- a skirt having a sliding surface coated with an oil repellent resin layer, wherein:
- the oil repellent resin layer extends at an incline with respect to a sliding surface centerline in a circumferential direction of the piston,
- a guide groove is formed in the sliding surface,
- the guide groove extends at an incline with respect to the sliding surface centerline from a sliding surface circumferential end portion toward a sliding surface central portion to introduce lubricating oil from the sliding surface circumferential end portion to the sliding surface central portion,
- the oil repellent resin layer is exposed along at least part of the bottom of the guide groove,
- the oil repellent resin layer is provided directly on that section of a base material of the piston which corresponds to the guide groove,
- a solid lubricating resin layer is so provided on the base material as to sandwich the oil repellent resin layer,
- the guide groove is formed in the solid lubricating resin layer, and
- the oil repellent resin layer is exposed along the bottom of the guide groove.
6 more elements
A piston for use in an internal combustion engine, comprising:
- a skirt having a sliding surface coated with an oil repellent resin layer, wherein:
- the oil repellent resin layer extends at an incline with respect to a sliding surface centerline in a circumferential direction of the piston,
- a guide groove is formed in the sliding surface,
- the guide groove extends at an incline with respect to the sliding surface centerline from a sliding surface circumferential end portion toward a sliding surface central portion to introduce lubricating oil from the sliding surface circumferential end portion to the sliding surface central portion,
- the oil repellent resin layer is exposed along at least part of the bottom of the guide groove,
- a solid lubricating resin layer is provided directly on a base material of the piston,
- the guide groove is formed in the solid lubricating resin layer, and
- the oil repellent resin layer is provided on the base material at the guide groove.
5 more elements
Dependencies are inferred from the claim text.