Multi-part piston for an internal combustion engine
First Claim
Patent Images
1. A multi-part piston for an internal combustion engine, comprising:
- an upper piston part that has a piston crown, an inner support element and an outer support element;
a lower piston part having an inner support element and an outer support element, said inner and outer support elements on the upper and lower piston parts delimiting an outer circumferential cooling channel and an inner cooling chamber having an opening in a bottom thereof;
a closure element that closes the opening, said closure element having at least one cooling oil opening; and
a holding element that configured as a separate element and being attached to an underside of the piston crown and extending vertically toward the opening, said holding element being disposed in the inner cooling chamber and said holding element abutting the closure element.
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Abstract
A multi-part piston for an internal combustion engine has an upper piston part with a piston crown, and a lower piston part, each of the piston parts having an inner and an outer support element that delimit an outer circumferential cooling channel and an inner cooling chamber. The cooling chamber bottom has an opening. A holding element is disposed in the inner cooling chamber and extends from the underside of the piston crown vertically toward the opening. The holding element carries a closure element that closes the opening and has at least one cooling oil opening.
15 Citations
16 Claims
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1. A multi-part piston for an internal combustion engine, comprising:
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an upper piston part that has a piston crown, an inner support element and an outer support element; a lower piston part having an inner support element and an outer support element, said inner and outer support elements on the upper and lower piston parts delimiting an outer circumferential cooling channel and an inner cooling chamber having an opening in a bottom thereof; a closure element that closes the opening, said closure element having at least one cooling oil opening; and a holding element that configured as a separate element and being attached to an underside of the piston crown and extending vertically toward the opening, said holding element being disposed in the inner cooling chamber and said holding element abutting the closure element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A multi-part piston for an internal combustion engine, comprising:
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an upper piston part that has a piston crown, an inner support element and an outer support element; a lower piston part having an inner support element and an outer support element, said inner and outer support elements on the upper and lower piston parts delimiting an outer circumferential cooling channel and an inner cooling chamber having an opening in a bottom thereof; a closure element that closes the opening, said closure element having at least one cooling oil opening, and a holding element that extends from an underside of the piston crown vertically toward the opening, said holding element being disposed in the inner cooling chamber and said holding element abutting the closure element, wherein an end of the holding element that faces the opening has a circumferential contact shoulder that surrounds a projection, wherein said shoulder lies on the closure element, and wherein the projection engages into a recess provided in the closure element.
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16. A multi-part piston for an internal combustion engine, comprising:
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an upper piston part that has a piston crown, an inner support element and an outer support element; a lower piston part having an inner support element and an outer support element, said inner and outer support elements on the upper and lower piston parts delimiting an outer circumferential cooling channel and an inner cooling chamber having an opening in a bottom thereof; a closure element made of spring seel material that closes the opening, said closure element having at least one cooling oil opening, and a holding element that extends from an underside of the piston crown vertically toward the opening, said holding element being disposed in the inner cooling chamber and said holding element abutting the closure element.
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Specification