Piston for an internal combustion engine
AssigneeMahle International GmbH
InventorsRainer Scharp, Peter Kemnitz
Life of this patent
Estimating the term…
Abstract
A piston for an internal combustion engine may include a piston head and a piston skirt. The piston head may include a piston crown, an encircling fire land, an encircling ring belt having a plurality of ring grooves and an encircling cooling duct disposed radially inwards from the ring belt. The cooling duct may be open in an axial direction away from the fire land and may be at least partially closed via a closure element. The cooling duct may have a cooling duct base and a cooling duct ceiling. The closure element may be arranged on the piston head to define the cooling duct base in a position above a lowermost ring groove of the plurality of ring grooves.
Claims20
A piston for an internal combustion engine, comprising:
- a piston head and a piston skirt together defining a reciprocating axis;
- the piston head including a piston crown, an encircling fire land, an encircling ring belt including a plurality of ring grooves, and an encircling cooling duct disposed radially inwards from the encircling ring belt with respect to the reciprocating axis, the encircling cooling duct being open in an axial direction away from the encircling fire land and at least partially closed via a closure element, the encircling cooling duct having a cooling duct base and a cooling duct ceiling, wherein the closure element is arranged in the piston head to define the cooling duct base in a position above a lowermost ring groove of the plurality of ring grooves;
- wherein an axial height of the encircling fire land with respect to the reciprocating axis is 9% or less than a nominal diameter of the piston head;
- and wherein an axial extent between the piston crown and the cooling duct base with respect to the reciprocating axis is between 11% and 17% of the nominal diameter of the piston head.
A piston for an internal combustion engine, comprising:
- a piston head and a piston skirt together defining a reciprocating axis;
- the piston head including a piston crown, a circumferential fire land, a circumferential ring belt including a plurality of ring grooves, and an annular cooling duct disposed radially inwards from the circumferential ring belt with respect to the reciprocating axis, the annular cooling duct configured open in an axial direction away from the circumferential fire land;
- a closure element at least partially closing the annular cooling duct and defining a cooling duct base positioned away from the circumferential fire land in relation to a cooling duct ceiling, the closure element disposed on the piston head to position the cooling duct base above a lowermost ring groove of the plurality of ring grooves;
- wherein the annular cooling duct defines a height in the axial direction of the reciprocating axis and a width in a radial direction of the reciprocating axis, and the height of the annular cooling duct is from 0.8 times to 1.7 times the width of the annular cooling duct;
- and wherein an axial extent between the piston crown and the cooling duct ceiling with respect to the reciprocating axis is from 3% to 7% of a nominal diameter of the piston head.
A piston for an internal combustion engine, comprising:
- a piston body having a center axis and a piston ring element coupled to the piston body, the piston body and the piston ring element together defining a piston head;
- the piston head including a piston crown, a circumferential fire land, a circumferential ring belt including a plurality of ring grooves, and an annular cooling duct disposed radially inwards from the circumferential ring belt with respect to the center axis, the annular cooling duct configured open in an axial direction away from the circumferential fire land;
- a closure element at least partially closing the annular cooling duct and defining a cooling duct base positioned away from the circumferential fire land in relation to a cooling duct ceiling, the closure element connected integrally with the piston body and arranged on the piston head to provide an annular gap at the cooling duct base;
- and wherein the closure element positions the cooling duct base at a level between a first ring groove and a second ring groove of the plurality of ring grooves.
Dependencies are inferred from the claim text.