Cylinder-head for an internal combustion engine

Details Cylinder-head for an internal combustion engine Cylinder-head for an internal combustion engine

F - Mech Eng,Light,Heat,Weapons

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F02F 1/26 (2006.01) F02F 1/38 (2006.01) F02B 3/06 (2006.01) F02F 1/24 (2006.01)

Patent

CA 1196537

ABSTRACT OF THE DISCLOSURE The material of which a cylinder-head is made must meet two conflicting requirements. The web-part between the gas-exchange valves must be highly ductile, whereas the sealing surface between the cylinder-head and barrel must have high resistance to creep under pressure at high temperatures. As the power-output of internal combustion engines increases, leading to increased thermal stressing of the cylinder-heads, known heat resistant cast aluminum alloys can no longer meet these requirements. Known reinforcement with inserts made of a material more resistant to heat has the disadvantage that the joint between the parts loosens in time as a result of differential expansion of the different materials. This pro- blem does not arise with reinforcement in the form of one or more inserts made of a precipitation hardened sintered aluminum, since the cylinder-head and inserts are made of the same basic material and thus have the same coefficient of expansion.

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