Piston for an internal combustion engine and method of manufacturing the piston
AssigneeMahle International GmbH
InventorsStephan Koerner, Daniel Lopez Martinez
Life of this patent
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Abstract
A piston for an internal combustion engine with a piston crown having an outer surface and with a thermal management layer. The thermal management layer contains a functional layer. The functional layer in turn contains a functional layer matrix, wherein the functional layer matrix includes polysiloxane and hollow spheres embedded in the functional layer matrix. The thermal conductivity of the functional layer is in the range of 0.2 to 2 W/(m*K) and the heat penetration coefficient of the functional layer is in the range of 400 to 1200 J/(K*m2*s½).
Claims18
A piston for an internal combustion engine, comprising:
- a piston crown having an outer surface;
- and
- a thermal management layer containing a functional layer, wherein the functional layer contains a functional layer matrix including a polysiloxane and hollow spheres embedded in the functional layer matrix;
- wherein a thermal conductivity of the functional layer is 0.2 to 2 W/(m*K);
- and
- wherein a heat penetration coefficient of the functional layer is 400 to 1200 J/(K*m2*s1/2).
A piston, comprising:
- a piston crown having an outer surface;
- and
- a thermal management layer including a functional layer and a cover layer, wherein the functional layer includes a functional layer matrix including polysiloxane and embedded hollow spheres;
- wherein the cover layer is attached to the functional layer facing away from the piston crown and includes polysiloxane;
- wherein a thermal conductivity of the functional layer is 0.3 to 0.4 W/(m*K);
- wherein a heat penetration coefficient of the functional layer is 600 to 760 J/(K*m2*s1/2);
- and
- wherein a specific heat capacity of the functional layer is 450 to 1000 J/(kg*K).
Dependencies are inferred from the claim text.