Piston including a pair of cooling chambers
First Claim
1. A piston for an internal combustion engine, comprising:
- a piston body having a first cooling chamber that is sealed closed and which contains therein a first cooling medium other than air which is operative during operation of the piston to extract heat from surrounding regions of said piston body;
a second cooling chamber disposed adjacent said first cooling chamber and which is open in a radial direction to receive a flow of cooling oil into said second cooling chamber during operation of said piston to extract additional heat from said piston body, wherein said piston body defines a wall separating said first cooling chamber from said second cooling chamber for transferring heat from the first cooling medium contained in said first cooling chamber to the cooling oil received in said second cooling chamber; and
a flange spaced from said wall to define said second cooling chamber, wherein said flange presents at least one aperture through which the cooling oil flows into said second cooling chamber during operation of said piston.
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Accused Products
Abstract
A piston for an internal combustion engine including a piston body (20). The piston body (20) defines a first cooling chamber (46) that is sealed closed and contains a first cooling medium (48) other than air. During operation of the piston, the first cooling medium (48) extracts heat from the surrounding regions of the piston body (20) to cool the piston body (20). The piston body (20) also defines a second cooling chamber (50) adjacent to the first cooling chamber (46). A cooling oil (51) is projected into the second cooling chamber (50) and against the portion of the piston body (20) separating the first and second cooling chambers (46, 50) to extract heat from the first cooling medium (48). The cooling oil (51) is redirected within the second cooling chamber (50) to extract additional heat from the first cooling medium (48) or directly from the piston body (20).
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Citations
17 Claims
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1. A piston for an internal combustion engine, comprising:
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a piston body having a first cooling chamber that is sealed closed and which contains therein a first cooling medium other than air which is operative during operation of the piston to extract heat from surrounding regions of said piston body; a second cooling chamber disposed adjacent said first cooling chamber and which is open in a radial direction to receive a flow of cooling oil into said second cooling chamber during operation of said piston to extract additional heat from said piston body, wherein said piston body defines a wall separating said first cooling chamber from said second cooling chamber for transferring heat from the first cooling medium contained in said first cooling chamber to the cooling oil received in said second cooling chamber; and a flange spaced from said wall to define said second cooling chamber, wherein said flange presents at least one aperture through which the cooling oil flows into said second cooling chamber during operation of said piston. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of cooling a piston in an internal combustion engine, comprising the steps of:
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providing a piston body including a first cooling chamber and a second cooling chamber adjacent the first cooling chamber, wherein the second cooling chamber is open in a radial direction to receive a flow of cooling oil into the second cooling chamber during operating of the piston, the piston body defines a wall separating the first cooling chamber from the second cooling chamber, and the piston body includes a flange spaced from the wall to define the second cooling chamber; sealing a first cooling medium other than air in the first cooling chamber for extracting heat from the surrounding regions of the piston body; and providing at least one opening in the flange defining the second cooling chamber for receiving the cooling oil into the second cooling chamber during operation to extract additional heat from the piston body. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification