Cast light metal piston
First Claim
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1. A cast light metal piston having a reciprocating axis for an internal combustion engine, comprising:
- a piston crown and a piston skirt adjoining the piston crown, the piston skirt including;
two skirt walls arranged on a pressure side and a counterpressure side, respectively;
a first box wall connecting the skirt wall on the pressure side to the skirt wall on the counterpressure side, the first box wall having a first pin hub positioned between a pressure side portion of the first box wall and a counterpressure side portion of the first box wall;
a second box wall connecting the skirt wall on the pressure side to the skirt wall on the counterpressure side, the second box wall having a second pin hub positioned between a pressure side portion of the second box wall and a counterpressure side portion of the second box wall;
an annularly encircling cooling channel;
wherein a thickness of the piston crown amounts to a maximum of 4.5 mm;
wherein the pressure side portion of the first box wall and the pressure side portion of the second box wall conically taper toward one another in a direction toward the skirt wall arranged on the pressure side and conically taper toward one another in a direction toward the piston crown;
wherein the counterpressure side portion of the first box wall and the counterpressure side portion of the second box wall conically taper from respective first and second end portions toward one another in the direction toward the piston crown;
wherein the skirt wall arranged on the pressure side is shorter in a circumferential direction of the reciprocating axis than the skirt wall arranged on the counterpressure side; and
wherein the first and second box walls are separated from one another by a distance in a radial direction of the reciprocating axis, and wherein the distance between the pressure side portion of the first box wall at the first pin hub and the pressure side portion of the second box wall at the second pin hub is greater than the distance between the counterpressure side portion of the first box wall at the first pin hub and the counterpressure side portion of the second box wall at the second pin hub.
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Abstract
A cast light metal piston for an internal combustion engine may include a piston crown and a piston skirt adjoining the piston crown. The piston skirt may include two skirt walls arranged on a pressure side and a counterpressure side, respectively. The piston skirt may have two box walls connecting the skirt walls, which conically taper towards one another in a direction of the piston crown. The piston may include an annularly encircling cooling channel. A thickness of the piston crown may amount to a maximum of 4.5 mm.
11 Citations
20 Claims
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1. A cast light metal piston having a reciprocating axis for an internal combustion engine, comprising:
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a piston crown and a piston skirt adjoining the piston crown, the piston skirt including; two skirt walls arranged on a pressure side and a counterpressure side, respectively; a first box wall connecting the skirt wall on the pressure side to the skirt wall on the counterpressure side, the first box wall having a first pin hub positioned between a pressure side portion of the first box wall and a counterpressure side portion of the first box wall; a second box wall connecting the skirt wall on the pressure side to the skirt wall on the counterpressure side, the second box wall having a second pin hub positioned between a pressure side portion of the second box wall and a counterpressure side portion of the second box wall; an annularly encircling cooling channel; wherein a thickness of the piston crown amounts to a maximum of 4.5 mm; wherein the pressure side portion of the first box wall and the pressure side portion of the second box wall conically taper toward one another in a direction toward the skirt wall arranged on the pressure side and conically taper toward one another in a direction toward the piston crown; wherein the counterpressure side portion of the first box wall and the counterpressure side portion of the second box wall conically taper from respective first and second end portions toward one another in the direction toward the piston crown; wherein the skirt wall arranged on the pressure side is shorter in a circumferential direction of the reciprocating axis than the skirt wall arranged on the counterpressure side; and wherein the first and second box walls are separated from one another by a distance in a radial direction of the reciprocating axis, and wherein the distance between the pressure side portion of the first box wall at the first pin hub and the pressure side portion of the second box wall at the second pin hub is greater than the distance between the counterpressure side portion of the first box wall at the first pin hub and the counterpressure side portion of the second box wall at the second pin hub. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An internal combustion engine, comprising:
- a cast light metal piston having a reciprocating axis, including;
a piston crown adjoining a piston skirt, the piston skirt including a pin hub, two skirt walls arranged on a pressure side and a counterpressure side, respectively, and first and second box walls connecting the skirt walls to the pin hub, the first and second box walls conically tapering towards one another in a direction of the piston crown; an annularly encircling cooling channel arranged in the piston crown; wherein a thickness of the piston crown is 4.5 mm or less; wherein each of the first and second box walls comprises a pressure side portion arranged between the pin hub and the skirt wall arranged on the pressure side and a counterpressure side portion arranged between the pin hub and the skirt wall arranged on the counterpressure side; wherein the pressure side portions of the first and second box walls conically taper from respective first and second end portions towards one another in a direction towards the skirt wall on the pressure side; and wherein the counterpressure side portions of the first and second box walls diverge away from one another in a direction towards the skirt wall on the counterpressure side wherein the first and second box walls are separated from one another by a distance in a radial direction of the reciprocating axis, and wherein the distance between the pressure side portion of the first box wall at the first pin hub and the pressure side portion of the second box wall at the second pin hub is greater than the distance between the counterpressure side portion of the first box wall at the first pin hub and the counterpressure side portion of the second box wall at the second pin hub. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- a cast light metal piston having a reciprocating axis, including;
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17. A light metal piston for an internal combustion engine, comprising:
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a piston crown having a central region defining a thickness of 4.5 mm or less; a piston skirt coupled to the piston crown; an annular cooling channel disposed in the piston crown; the piston skirt including a first skirt wall arranged on a pressure side, a second skirt wall arranged on a counterpressure side, a first box wall connecting the first skirt wall to the second skirt wall, a second box wall connecting the first skirt wall to the second skirt wall and arranged at a distance from the first box wall, and a pin hub extending along a direction transverse to the first box wall and the second box wall, wherein the pressure side is separated from the counterpressure side via the pin hub; wherein each of the first box wall and the second box wall comprises a pressure side portion arranged between the pin hub and the first skirt wall and a counterpressure side portion arranged between the pin hub and the second skirt wall; wherein the first box wall and the second box wall taper towards one another in a direction of the piston crown, and wherein the pressure side portion of the first box wall and the pressure side portion of the second box wall conically taper from respective first and second end portions towards one another in a direction towards the first skirt wall; wherein the counterpressure side portion of the first box wall and the counterpressure side portion of the second box wall diverge away from one another in a direction towards the second skirt wall; and wherein the first and second box walls are separated from one another by a distance in a radial direction of the reciprocating axis, and wherein the distance between the pressure side portion of the first box wall at the first pin hub and the pressure side portion of the second box wall at the second pin hub is greater than the distance between the counterpressure side portion of the first box wall at the first pin hub and the counterpressure side portion of the second box wall at the second pin hub. - View Dependent Claims (18, 19, 20)
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Specification