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US 10,767,594 B2Granted
Methods and systems for engine block thermal conductivity
AssigneeFord Global Technologies, LLC
InventorsCarsten Weber, Paul Turner, Urban Morawitz, Clemens Maria Verpoort
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for coatings of a portion of an engine block shaping a combustion chamber. In one example, the engine block includes a first coating with a thermal conductivity higher than a conductivity of the engine block arranged in an upper region of the combustion chamber and a second coating with a thermal conductivity lower than the conductivity of the engine block arranged in a lower region of the combustion chamber, and where the second coating touches the first coating.
Claims20
An engine block comprising:
- a first coating arranged on interior surfaces of a cylinder near a top-dead center position of a piston and a second coating arranged on the interior surfaces near a bottom-dead center position of the piston, the first coating comprising a hypereutectic aluminum-silicon alloy and the second coating comprising an iron-based alloy with a thermal conductivity lower than a thermal conductivity of the first coating and a thermal conductivity of the interior surfaces.
A system comprising:
- a combustion chamber shaped between surfaces of an engine head, an engine block, and a piston, the piston shaped to oscillate along a longitudinal axis passing through its center;
- a first coating arranged on surfaces of the engine block corresponding to interior surfaces of the combustion chamber adjacent to the engine head and a top-dead center position of the piston, and where a first coating thermal conductivity is higher than an interior surfaces thermal conductivity, and where the first coating is an aluminum-silicon alloy comprising greater than 12% silicon;
- and
- a second coating arranged on surfaces of the engine block corresponding to interior surfaces of the combustion chamber distal to the engine head and adjacent to a bottom-dead center position of the piston, and where a second coating thermal conductivity is lower than the interior surfaces thermal conductivity, and where the second coating is an iron-alloy with a nanocomposite material.
1 more element
A method comprising:
- applying a first coating with a first thermal conductivity to interior surfaces of an upper region of a combustion chamber, wherein the first coating is an aluminum-silicon alloy comprising greater than or equal to 12% silicon;
- and
- applying a second coating with a second thermal conductivity less than the first thermal conductivity to interior surfaces of a lower region of the combustion chamber during a cooling process of the first coating to generate a weld-metallurgical bond therebetween;
- wherein
- the upper region extends from a top of a portion of the combustion chamber shaped in an engine block down to a portion of the combustion chamber equal to between 20 to 40% of its total length, and where the lower region extends from the upper region to a bottom of a portion of the combustion chamber shaped in the engine block.
2 more elements
Dependencies are inferred from the claim text.