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US 7,287,459 B2Granted
Piston for internal combustion engine
AssigneeHonda Motor Co., Ltd.
InventorsMasamune Tabata, Naoko Sato, Takashi Shiraishi, Yasunori Murakami
Life of this patent
Estimating the term…
Abstract
A piston for an internal combustion engine, the piston having a skirt part, comprises: a resinous coating layer formed on a surface of the skirt part; and a plurality of concaves regularly arranged in the resinous coating layer. The concaves are non-coated regions in which said resinous coating layer is not formed.
Claims22
A piston for an internal combustion engine, the piston having a skirt part, comprising:
- a resinous coating layer formed on a surface of the skirt part;
- and
- at least four concaves having a common geometric shape which are regularly arranged in the form of one of rhombic and rectangular lattices in the resinous coating layer,
- wherein a length of said concaves in a sliding direction of said skirt part is “S” and a length of said concaves in a circumferential direction perpendicular to said sliding direction is “L” the length being in relationship of “S”=“L” or “S”<“L,” and wherein said “S” and “L” are not less than 5 μm and not more than 4 mm.
1 more element
A piston for an internal combustion engine, the piston having a skirt part, comprising:
- a resinous coating layer formed on a surface of the skirt part;
- and
- a plurality of concaves regularly arranged in the resinous coating layer,
- wherein when a length of said concaves in a sliding direction of said skirt part is “S,” and a length of said concaves in circumferential direction perpendicular to said sliding direction is “L,” the lengths are set in relationship of “S”=“L” or “S”<“L”, and
- wherein a shortest interval between said adjacent concaves in said circumferential direction is “PL,” said “PL” being in a range from “0.5”דS” to “2”דS”.
2 more elements
A piston for an internal combustion engine, the piston having a skirt part, comprising:
- a resinous coating layer formed on a surface of the skirt part;
- and
- at least four concaves having a common geometric shape which are regularly arranged in the form of one of rhombic and rectangular lattices in the resinous coating layer,
- wherein when a length of said concaves in a sliding direction of said skirt part is “S,” and a length of said concaves in circumferential direction perpendicular to said sliding direction is “L,” the lengths are set in relationship of “S”=“L” or “S”<“L”, and
- wherein a shortest interval between said adjacent concaves in said circumferential direction is “PS,” said “PS” being in a range from “0.5”דS” to “2”דS”.
2 more elements
Dependencies are inferred from the claim text.