Light-alloy piston with a combustion bowl
AssigneeMahle GmbH
InventorsUlrich Bischofberger, Dieter Muller-Schwelling
Life of this patent
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Abstract
A ring for protecting the edge of a combustion bowl disposed within a top surface of a light-alloy piston for a diesel engine. The ring is made of fine-grain carbon and serves as bowl edge armor. The ring is galvanically coated before being bonded to the remainder of the piston. The exterior surface of the bowl edge armor is coated with an antioxidation compound.
Claims10
A device for protecting the edge of a combustion bowl disposed within a top surface of a light-alloy piston for a diesel engine, the device comprising:
- a ring consisting of fine graphite defining bowl edge armor.
A process for manufacturing a light-alloy piston with a combustion bowl and bowl edge armor for a diesel engine, comprising the steps of:
- producing a ring consisting of fine graphite;
- galvanizing the ring to form a metal coating thereon;
- dipping the ring into a first metal melt to slightly dissolve the metal coating;
- removing the ring from the first metal melt and placing the ring into a form with the metal coating still partially unsolidified;
- and
- forming the piston by pouring a second light-alloy metal melt around the galvanized ring to produce a metallic bond between the ring and the second light-alloy metal, wherein a combustion bowl is formed in the piston with the ring defining bowl edge armor.
Dependencies are inferred from the claim text.