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US 9,404,439 B2Granted
Piston with cooling gallery and cooling gallery fins
AssigneeMahle International GmbH
InventorRalph Klein
Life of this patent
Estimating the term…
Abstract
A piston may include 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. The piston may include a piston skirt including a pair of oppositely disposed pin bosses, the pin bosses each defining a piston pin bore. The piston skirt may have a radially inner skirt mating surface cooperating along a radially inner interface region with the radially inner crown mating surface, and a radially outer skirt mating surface cooperating along a radially outer interface region with the radially outer crown mating surface such that the cooling gallery is substantially enclosed. The piston may include at least one cooling fin extending from an interior surface of the cooling gallery.
Claims20
A piston, comprising:
- a piston crown having a longitudinal axis and including a radially inner crown mating surface and a radially outer crown mating surface, the piston crown defining at least in part a cooling gallery extending about a periphery of the piston crown;
- and
- a piston skirt, including:
- a pair of oppositely disposed pin bosses, the pin bosses each defining a piston pin bore;
- a radially inner skirt mating surface cooperating along a radially inner interface region with the radially inner crown mating surface;
- a radially outer skirt mating surface cooperating along a radially outer interface region with the radially outer crown mating surface such that the cooling gallery is substantially enclosed;
- and
- at least one cooling fin extending from an interior surface of the cooling gallery, the at least one cooling fin having an axial extent and a radial extent transverse to the axial extent, wherein the axial extent is greater than the radial extent, and wherein the radial extent is greatest at a base of the at least one cooling fin and decreases in a direction away from the interior surface from which the at least one cooling fin extends.
5 more elements
A piston, comprising:
- a piston crown having a longitudinal axis and including a first crown mating surface and a second crown mating surface, the piston crown defining at least partially a cooling gallery extending about a periphery of the piston crown;
- a piston skirt, including:
- a pair of oppositely disposed pin bosses, the pin bosses each defining a piston pin bore;
- a first skirt mating surface cooperating with the first crown mating surface along a first interface region;
- a second skirt mating surface cooperating with the second crown mating surface along a second interface region, at least one of the first interface region and the second interface region securely fixed to define a joint;
- wherein the piston crown and the piston skirt together define an interior surface of the cooling gallery such that the cooling gallery is substantially enclosed;
- and
- at least one cooling fin extending from at least one of an upper boundary and an axially lower boundary of the interior surface of the cooling gallery, the at least one cooling fin having a radial extent that decreases gradually in a direction away from the interior surface from which the at least one cooling fin extends.
5 more elements
A method, comprising:
- providing a piston crown having a longitudinal axis and including a first crown mating surface and a second crown mating surface, the piston crown defining at least in part a cooling gallery extending about a periphery of the piston crown;
- providing a piston skirt including a first skirt mating surface and a second skirt mating surface;
- forming at least one cooling gallery fin from at least one of the piston crown and the piston skirt;
- adjoining the piston crown to the piston skirt, wherein adjoining the piston crown to the piston skirt includes coupling the first crown mating surface and the second crown mating surface with the first skirt mating surface and the second skirt mating surface to form a first interface region between the first crown mating surface and the first skirt mating surface, a second interface region between the second crown mating surface and the second skirt mating surface, and the cooling gallery defined by the piston crown together with the piston skirt, wherein the piston skirt includes a pair of oppositely disposed pin bosses defining a piston pin bore;
- and
- wherein the at least one cooling gallery fin extends from an interior surface of the cooling gallery and has an axial extent greater than a radial extent, and wherein the radial extent is greatest at a base of the at least one cooling gallery fin and decreases in a direction away from the interior surface from which the at least one cooling gallery fin extends.
3 more elements
Dependencies are inferred from the claim text.