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US 9,175,593 B2Granted
Piston for internal combustion engine
AssigneeHitachi Automotive Systems, Ltd.
InventorKeitarou Shishido
Life of this patent
Estimating the term…
Abstract
A piston for an internal combustion engine, including a crown portion that defines a combustion chamber, a ring-shaped cooling channel formed in the crown portion, through which a cooling oil flows, and a plurality of concave portions formed on at least one side of the cooling channel, in an axial direction of the piston, each of the plurality of concave portions having a curved surface.
Claims19
A piston for an internal combustion engine, comprising:
- a crown portion that defines a combustion chamber;
- a ring-shaped cooling channel formed in the crown portion, through which a cooling oil flows;
- and
- a plurality of concave portions formed on at least one side of the cooling channel in an axial direction of the piston, each of the plurality of concave portions having a curved surface;
- wherein each of the plurality of concave portions has a radial width smaller than a width of the cooling channel;
- and
- wherein each of the plurality of concave portions is positioned at a position apart from a radial center of the cooling channel in a radial direction.
4 more elements
A piston for an internal combustion engine, comprising:
- a crown portion that defines a combustion chamber;
- a ring-shaped cooling channel formed in the crown portion, through which a cooling oil flows;
- and
- a plurality of concave portions formed on at least one side of the cooling channel in an axial direction of the piston, each of the plurality of concave portions having a semispherical surface;
- wherein each of the plurality of concave portions has a radial width smaller than a width of the cooling channel;
- and
- wherein each of the plurality of concave portions is positioned at a position apart from a radial center of the cooling channel in a radial direction.
4 more elements
A piston for an internal combustion engine, comprising:
- a crown portion that defines a combustion chamber;
- and
- a ring-shaped cooling channel formed in the crown portion, through which a cooling oil flows, the cooling channel comprising a plurality of concave portions formed on at least one side in an axial direction of the piston;
- wherein each of the plurality of concave portions has a concave shape configured such that the cooling oil is allowed to flow and turn around in multiple directions in the concave portion in accordance with an axial movement of the piston;
- wherein each of the plurality of concave portions has a radial width smaller than a width of the cooling channel;
- and
- wherein each of the plurality of concave portions is positioned at a position apart from a radial center of the cooling channel in a radial direction.
4 more elements
Dependencies are inferred from the claim text.