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US 5,487,364 AGranted
Piston for an internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMasashi Takeda, Kazuyuki Fukuhara, Motoichi Murakami
Life of this patent
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Abstract
A piston for an internal combustion engine includes a skirt portion configured so that a value S/(D * L) is in the range of 0.4-0.55, where L is a length of the skirt portion, D is a diameter of a cylinder bore, and S is an area of an image of the skirt portion when the skirt portion is projected onto a plane perpendicular to a direction connecting a pair of boss portions. This condition decreases the friction between the piston and the cylinder bore.
Claims10
A piston for an internal combustion engine comprising:
- a top portion;
- a pair of boss portions opposed to each other in a first diametrical direction of the piston, each of the boss portions being integrally connected to the top portion from a lower side of the top portion and having a piston-pin hole formed therein;
- and
- a pair of skirt portions opposed to each other in a second diametrical direction of the piston perpendicular to the first diametrical direction of the piston, each of the skirt portions being integrally connected to the top portion from the lower side of the top portion, wherein each skirt portion is configured so as to satisfy the following dimensional relationship:
- 0.4.ltoreq.S/(D.multidot.L).ltoreq.0.55
- where, L is a length of said each skirt portion, D is a diameter of a cylinder bore into which said piston is inserted, and S is an area of an image which each skirt portion forms when projected onto a vertical plane parallel to the first diametrical direction of the piston and wherein each skirt portion has an upper portion and a lower portion, and wherein the lower portion has a greater width than the upper portion.
3 more elements
A piston for an internal combustion engine comprising:
- a top portion;
- a pair of boss portions opposed to each other in a first diametrical direction of the piston, each of the boss portions being integrally connected to the top portion from a lower side of the top portion and having a piston-pin hole formed therein;
- and
- a pair of skirt portions opposed to each other in a second diametrical direction of the piston perpendicular to the first diametrical direction of the piston, each of the skirt portions being integrally connected to the top portion from the lower side of the top portion, wherein each skirt portion is configured so as to satisfy the following dimensional relationship:
- 0.45.ltoreq.S/(D.multidot.L).ltoreq.0.5
- where, L is a length of said each skirt portion, D is a diameter of a cylinder bore into which said piston is inserted, and S is an area of an image which each skirt portion forms when projected onto a vertical plane parallel to the first diametrical direction of the piston.
3 more elements
A piston for an internal combustion engine comprising:
- a top portion;
- a pair of boss portions opposed to each other in a first diametrical direction of the piston, each of the boss portions being integrally connected to the top portion from a lower side of the top portion and having a piston-pin hole formed therein;
- and
- a pair of skirt portions opposed to each other in a second diametrical direction of the piston perpendicular to the first diametrical direction of the pistons each of the skirt portions being integrally connected to the top portion from the lower side of the top portion, wherein each skirt portion is configured so as to satisfy the following dimensional relationship:
- 0.4.ltoreq.S/(D.multidot.L).ltoreq.0.55
- where, L is a length os said each skirt portion, D is a diameter of a cylinder bore into which said piston is inserted, and S is an area of an image which each skirt portion forms when projected onto a vertical plane parallel to the first diametrical direction of the piston and wherein each skirt portion has a constant width over an entire length thereof.
3 more elements
Dependencies are inferred from the claim text.