Piston of internal combustion engine
First Claim
1. A piston of an internal combustion engine comprising:
- a skirt portion adapted to be in sliding-contact with a cylinder wall;
an inner crown-plus-boss portion having a crown portion and piston-pin boss portions;
a stay portion interconnecting said skirt portion and said inner crown-plus-boss portion at a lower portion of the piston; and
a partition groove that separates said skirt portion and said inner crown-plus-boss portion and which comprises an annular separation slot which extends completely around a circumference of an upper surface of an upper portion of the piston.
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Accused Products
Abstract
A piston of an internal combustion engine, comprises a skirt portion in sliding-contact with a cylinder wall, an inner crown-plus-boss portion having a crown portion and piston-pin boss portions, and a stay portion interconnecting the skirt portion and the inner crown-plus-boss portion at a lower portion of the piston. Also provided is an annular partition groove through which a rim of the skirt portion and the inner crown-plus-boss portion are partitioned all around the circumference of the upper portion of the piston. A thermal-expansion absorption ring is tightly fitted into the annular partition groove in a gas tight-fashion. The top face of the inner crown-plus-boss portion, the flat face of the rim of the skirt portion, and the top wall of the thermal-expansion absorption ring serve as a piston crown.
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Citations
28 Claims
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1. A piston of an internal combustion engine comprising:
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a skirt portion adapted to be in sliding-contact with a cylinder wall;
an inner crown-plus-boss portion having a crown portion and piston-pin boss portions;
a stay portion interconnecting said skirt portion and said inner crown-plus-boss portion at a lower portion of the piston; and
a partition groove that separates said skirt portion and said inner crown-plus-boss portion and which comprises an annular separation slot which extends completely around a circumference of an upper surface of an upper portion of the piston. - 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)
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24. A piston of an internal combustion engine comprising:
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a skirt portion having an upper annular end;
an inner crown-plus-boss portion having a crown portion and piston-pin boss portions, the crown portion having a peripheral edge portion located in a contact-free relationship inboard of and juxtaposedly spaced from the upper annular end of the skirt portion, to define an annular void via which free fluid communication between a space above the crown portion and a space below the piston-pin boss portion, is permitted, said annular void extending completely and continuously about the periphery of the crown portion to completely separate the crown and boss portion from the skirt portion; and
a resilient ring member disposed in the annular void so as to interconnect the upper annular end of the skirt portion and the peripheral edge portion of the crown portion in a manner which closes the annular void and prevents the free fluid communication therethrough. - View Dependent Claims (25, 27)
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26. A piston of an internal combustion engine comprising:
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a skirt portion having an upper annular end;
an inner crown-plus-boss portion having a crown portion an piston-pin boss portions, the crown portion having a peripheral edge portion located in a contact-free relationship inboard of and juxtaposedly spaced from the upper annular end of the skirt portion, to define an annular void via which free fluid communication between a space above the crown portion and a space below the piston-pin boss portion, is permitted;
a ring member disposed in the annular void so as to interconnect the upper annular end of the skirt portion and the peripheral edge portion of the crown portion in a manner which closes the annular void and prevents the free fluid communication therethrough; and
wherein said ring member has at least one wall member which flexes and absorbs thermally induced radial expansion of the crown portion toward the upper annular end of the skirt portion.
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28. A piston of an internal combustion engine comprising:
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a skirt portion having an upper annular end;
an inner crown-plus-boss portion having a crown portion and piston-pin boss portions, the crown portion having a peripheral edge portion located in a contact-free relationship inboard of and juxtaposedly spaced from the upper annular end of the skirt portion, to define an annular void via which free fluid communication between a space above the crown portion and a space below the piston-pin boss portion, is permitted; and
thermal-expansion absorption ring means disposed in the annular void for interconnecting the upper annular end of the skirt portion and the peripheral edge portion of the crown portion in a manner which closes the annular void, prevents the free fluid communication therethrough, and resiliently absorbs thermal expansion of said inner crown-plus-boss portion toward the upper annular end of said skirt portion.
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Specification