Piston with cooling gallery
First Claim
Patent Images
1. A piston, comprising:
- a piston crown including radially inner and outer crown mating surfaces, the crown defining at least in part a cooling gallery extending about a periphery of the crown;
a piston skirt, including;
a pair of oppositely disposed pin bosses, the pin bosses each defining piston pin bores and cooperating to define a generally open central region configured to receive a connecting rod between the pin bosses;
a radially inner skirt mating surface abutted along a radially inner interface region with the radially inner crown mating surface;
a radially outer skirt mating surface abutted along a radially outer interface region with the radially outer crown mating surface such that the cooling gallery is substantially enclosed; and
an inner collar wall disposed radially inwardly of the radially inner interface region, the inner collar wall extending annularly about the generally open central region and extending upwards to a free end disposed longitudinally above the radially inner mating surface of the skirt with respect to the piston assembly, thereby generally enclosing the radially inner interface region from the central region;
wherein the collar wall cooperates with the radially inner interface region to define an annular gallery;
wherein the annular gallery defines a cross-section elongated longitudinally with respect to the piston.
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Abstract
An exemplary piston assembly and method of making the same are disclosed. An exemplary piston assembly may include a piston crown and skirt. The crown may include radially inner and outer crown mating surfaces, and the crown may define at least in part a cooling gallery extending about a periphery of the crown. The skirt may further include an inner collar wall disposed radially inwardly of a radially inner interface region and extending upwards to a free end. The collar wall may generally enclose the radially inner interface region from the central region.
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Citations
22 Claims
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1. A piston, comprising:
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a piston crown including radially inner and outer crown mating surfaces, the crown defining at least in part a cooling gallery extending about a periphery of the crown; a piston skirt, including; a pair of oppositely disposed pin bosses, the pin bosses each defining piston pin bores and cooperating to define a generally open central region configured to receive a connecting rod between the pin bosses; a radially inner skirt mating surface abutted along a radially inner interface region with the radially inner crown mating surface; a radially outer skirt mating surface abutted along a radially outer interface region with the radially outer crown mating surface such that the cooling gallery is substantially enclosed; and an inner collar wall disposed radially inwardly of the radially inner interface region, the inner collar wall extending annularly about the generally open central region and extending upwards to a free end disposed longitudinally above the radially inner mating surface of the skirt with respect to the piston assembly, thereby generally enclosing the radially inner interface region from the central region; wherein the collar wall cooperates with the radially inner interface region to define an annular gallery; wherein the annular gallery defines a cross-section elongated longitudinally with respect to the piston. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A piston, comprising:
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a piston crown including radially inner and outer crown mating surfaces, the crown defining at least in part a cooling gallery extending about a periphery of the crown; a piston skirt, including; a pair of oppositely disposed pin bosses, the pin bosses each defining piston pin bores and cooperating to define a generally open central region configured to receive a connecting rod between the pin bosses; a radially inner skirt mating surface abutted along a radially inner interface region with the radially inner crown mating surface; a radially outer skirt mating surface abutted along a radially outer interface region with the radially outer crown mating surface such that the cooling gallery is substantially enclosed; and an inner collar wall disposed radially inwardly of the radially inner interface region, the inner collar wall extending annularly about the generally open central region and extending upwards to a free end, wherein the collar wall cooperates with the radially inner interface region to define an annular gallery positioned radially inwardly of the radially inner interface region, the annular gallery defined by the collar wall and the radially inner interface region; wherein the annular gallery defines a volume having a cross-section elongated longitudinally with respect to the piston. - View Dependent Claims (14, 15, 16, 17)
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18. A method, comprising:
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providing a piston crown including radially inner and outer crown mating surfaces, the crown defining at least in part a cooling gallery extending about a periphery of the crown; abutting the inner and outer crown mating surface with corresponding inner and outer skirt mating surfaces of a piston skirt to form a radially inner interface region between the inner mating surfaces, a radially outer interface region between the outer mating surfaces, and a cooling gallery disposed between the radially inner and outer interface regions, the skirt including a pair of oppositely disposed pin bosses defining piston pin bores and cooperating to define a generally open central region configured to receive a connecting rod between the pin bosses; forming a collar wall disposed radially inwardly of the radially inner interface region, the inner collar wall extending annularly about the generally open central region and extending upwards from the skirt to a free end disposed longitudinally above the radially inner mating surface of the skirt with respect to the piston assembly; and defining an annular gallery with the collar wall, the annular gallery defining an annular volume between the collar wall and the radially inner interface region, the circumferential volume defining a lateral cross-section elongated longitudinally with respect to the piston. - View Dependent Claims (19, 20, 21, 22)
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Specification