Piston for internal combustion engine
AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorsYoshihisa Hirosawa, Hitoshi Shimamura
Life of this patent
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Abstract
A piston for an internal combustion engine includes a piston body. The piston body includes a head, two side walls, two skirts, and a reinforcement member. The head includes a recessed crown. Each side wall includes a pin boss configured to support a piston pin. The two skirts are respectively located at a thrust side with respect to an axis of the piston pin and an anti-thrust side with respect to the axis of the piston pin. The reinforcement member includes two legs and a connecting portion connecting upper ends of the two legs. The two legs are respectively insert-casted in the two skirts. The connecting portion is insert-casted in the head.
Claims6
A piston for an internal combustion engine, the piston comprising:
- a piston body including:
- a head including a recessed crown;
- two side walls, each including a pin boss configured to support a piston pin;
- and
- two skirts, respectively located at a thrust side with respect to an axis of the piston pin and an anti-thrust side with respect to the axis of the piston pin;
- and
- a reinforcement member attached to the piston body, the reinforcement member including two legs and a connecting portion connecting upper ends of the two legs, wherein
- the two legs are respectively insert-casted in the two skirts, and the connecting portion is insert-casted in the head,
- the reinforcement member is formed from a material having a higher Young's modulus than a material of the piston body,
- the two skirts each include an outer surface, and the outer surface includes vertical strips of resin-coated portions,
- each of the resin-coated portions includes a first end located near the head and a second end opposite to the first end,
- the second end of each resin-coated portion is tapered so that a distance between the second ends of adjacent ones of the resin-coated portions is increased toward the second end from the first end.
A piston for an internal combustion engine, the piston comprising:
- a piston body including:
- a head including a recessed crown;
- two side walls, each including a pin boss configured to support a piston pin;
- and
- two skirts, respectively located at a thrust side with respect to an axis of the piston pin and an anti-thrust side with respect to the axis of the piston pin;
- and
- a reinforcement member attached to the piston body, the reinforcement member including two legs and a connecting portion connecting upper ends of the two legs, wherein
- the two legs are respectively insert-casted in the two skirts, and the connecting portion is insert-casted in the head,
- the two legs and the connecting portion each include an inner surface, which is exposed to an inner void in the piston body, and the inner surface includes dimples,
- the two skirts each include an outer surface, and the outer surface includes vertical strips of resin-coated portions,
- each of the resin-coated portions includes a first end located near the head and a second end opposite to the first end, and
- the second end of each resin-coated portion is tapered so that a distance between the second ends of adjacent ones of the resin-coated portions is increased toward the second end from the first end.
Dependencies are inferred from the claim text.