Oil-cooled piston for an internal combustion engine
First Claim
1. A piston for an internal combustion engine, comprising:
- a piston head including a crown and pin bosses depending from said crown, said crown having an outer circumferential ring belt section and an inner combustion bowl section;
an articulated piston skirt including opposed thrust walls, opposed sidewalls, and a transverse bridge extending diametrically across said piston skirt between said opposed sidewalls;
a circumferential cooling gallery encompassed within said ring belt section of said crown; and
a central cooling passage in fluid communication with said circumferential cooling gallery, said cooling passage extending between said crown of said piston head and said piston skirt and extending diametrically across said piston skirt, beneath at least a portion of said ring belt section and beneath at least a portion of said combustion bowl section of said crown,wherein said transverse bridge has an elevated central region, side regions extending in radially opposite directions from said central region toward said thrust walls, and a drain in said central region through which cooling oil can flow from said central cooling passage into a pin bore gap.
1 Assignment
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Accused Products
Abstract
A piston for an internal combustion engine. The piston comprises a piston head and an articulated piston skirt. The piston head includes a crown and pin bosses depending from the crown. The piston skirt includes opposed thrust walls, opposed sidewalls, and a transverse bridge extending diametrically across the piston skirt, between the opposed sidewalls. A circumferential cooling gallery is encompassed within an outer circumferential ring belt section of the crown and is in fluid communication with a central cooling passage that extends between the crown and the piston skirt. The central cooling passage extends diametrically across the piston skirt, beneath at least a portion of the ring belt section and beneath at least a portion of an inner combustion bowl section of the crown.
48 Citations
27 Claims
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1. A piston for an internal combustion engine, comprising:
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a piston head including a crown and pin bosses depending from said crown, said crown having an outer circumferential ring belt section and an inner combustion bowl section; an articulated piston skirt including opposed thrust walls, opposed sidewalls, and a transverse bridge extending diametrically across said piston skirt between said opposed sidewalls; a circumferential cooling gallery encompassed within said ring belt section of said crown; and a central cooling passage in fluid communication with said circumferential cooling gallery, said cooling passage extending between said crown of said piston head and said piston skirt and extending diametrically across said piston skirt, beneath at least a portion of said ring belt section and beneath at least a portion of said combustion bowl section of said crown, wherein said transverse bridge has an elevated central region, side regions extending in radially opposite directions from said central region toward said thrust walls, and a drain in said central region through which cooling oil can flow from said central cooling passage into a pin bore gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An articulated piston skirt, comprising:
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diametrically opposed arcuate thrust walls extending in a generally longitudinal direction from an upper end to a lower end of said piston skirt; opposed generally planar sidewalls extending across said piston skirt, from one arcuate thrust wall to another and from said upper end to said lower end of said piston skirt; a transverse bridge extending diametrically across said piston skirt, from one of said arcuate thrust walls to another, between said generally planar sidewalls, said transverse bridge including a transverse flow surface over which cooling oil can flow from one of said arcuate thrust walls to another; lateral fins extending in a generally upward direction from said bridge and in a generally lateral direction along said generally planar sidewalls; and a central channel defined above said transverse flow surface of said transverse bridge and bounded on opposite sides by said lateral fins, wherein said transverse bridge is configured to at least partially define a central cooling passage that extends diametrically across said piston skirt, from one of said arcuate thrust walls to another. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A piston assembly for an internal combustion engine, comprising:
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a piston head including a crown and pin bosses depending from said crown, said pin bosses having axially aligned pin bores, and said crown comprising a circumferential upper wall, a circumferential lower wall, a combustion wall, an outer ring belt wall, and an annular inner wall, wherein said outer ring belt wall and said annular inner wall respectively depend from said circumferential upper wall and said combustion wall to said circumferential lower wall of said crown and are radially spaced apart from each other; an articulated piston skirt including opposed thrust walls, opposed sidewalls having axially aligned pin bores, and a transverse bridge extending diametrically across said piston skirt, from one of said thrust walls to another, between said sidewalls; a piston pin that couples said piston head and said piston skirt to each other; a central cooling passage extending between said crown of said piston head and said piston skirt, and extending beneath said combustion wall and said circumferential lower wall of said crown; and a circumferential cooling gallery encompassed within said crown of said piston head and disposed between said circumferential upper wall and said circumferential lower wall and between said outer ring belt wall and said annular inner wall of said crown, wherein said piston head and said piston skirt comprise discrete components of said piston assembly. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification