Piston for internal combustion engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsAkifumi Nomura, Yasuo Shimura
Life of this patent
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Abstract
To lighten and miniaturize a piston and form a piston for a high-speed revolution. A top ring groove and an oil ring groove are formed on the periphery of a crown and a lubricator is provided inside the oil ring groove. A pair of piston pin bosses are provided continuously under the crown in opposite positions and a skirt is provided apart by 90°. The lower end of the skirt is located on the upside of the lower end of the piston pin boss and a lubricator is provided in an upper part of the skirt, under and in the vicinity of the oil ring groove.
Claims18
A piston for an internal combustion engine provided with a crown, a pair of piston pin bosses respectively integrated with the crown and respectively opposed and a pair of skins respectively integrated with the crown and respectively opposed, wherein:
- a lower end of the pair of skins extends downwardly from said crown a shorter distance relative to a lower end of the pair of piston pin bosses and a circumferential width of each skirt is equivalent to 40% or less of a diameter of the piston.
A piston for an internal combustion engine comprising:
- a crown;
- a pair of piston pin bosses respectively integrated with the crown and respectively opposed with respect to each other, said pair of piston pin bosses including a lower end extending downwardly a first predetermined distance relative to said crown;
- and
- a pair of skirts respectively integrated with the crown and respectively opposed with respect to each other, said pair of skirts including a lower end extending downwardly a second predetermined distance relative to said crown and a circumferential width of each skirt is equivalent to 40% or less of a diameter of the piston;
- wherein said first predetermined distance that the lower end of said pair of piston pin bosses extends from said crown is greater relative to the second predetermined distance that the lower end of the pair of skirts extends from said crown.
Dependencies are inferred from the claim text.