VALVE GUIDE
To provide a valve guide having an excellent heat lowering property.SOLUTION: A valve guide is press-fitted into a cylinder head of an internal combustion engine to slidably support a valve, and has a plating film at least on an outer peripheral surface. The plating film formed on the outer peripher...
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Zusammenfassung: | To provide a valve guide having an excellent heat lowering property.SOLUTION: A valve guide is press-fitted into a cylinder head of an internal combustion engine to slidably support a valve, and has a plating film at least on an outer peripheral surface. The plating film formed on the outer peripheral surface is preferably a copper plating film or a copper alloy plating film, which has a thickness: 1 to 100 μm, a hardness in Vickers hardness HV: 50 to 300 HV, and in which the hardness of the plating film satisfies a range of 1.05 to 4.5 times the hardness of the cylinder head. Further, the plating film preferably has a surface roughness of 0.1 to 1.6 μm, which is an arithmetic average roughness Ra based on the regulation of JIS B 0601-1994. By forming such a plating film on at least the outer peripheral surface of the valve guide, a valve guide for an internal combustion engine having excellent thermal conductivity (heat lowering property) can be easily obtained.SELECTED DRAWING: Figure 1
【課題】熱引け性に優れたバルブガイドを提供する。【解決手段】内燃機関のシリンダヘッドに圧入されて、バルブを摺動可能に支持するバルブガイドであって、少なくとも外周面にめっき膜を有する。外周面に形成されるめっき膜は、銅めっき膜または銅合金めっき膜とすることが好ましく、厚さ:1〜100μmで、ビッカース硬さHVで硬さ:50〜300HVを有し、かつめっき膜の硬さがシリンダヘッドの硬さの1.05〜4.5倍の範囲を満足するめっき膜とすることが好ましい。また、めっき膜は、JIS B 0601-1994の規定に準拠した算術平均粗さRaで、0.1〜1.6μmである表面粗さを有することが好ましい。このようなめっき膜をバルブガイドの少なくとも外周面に形成することにより、優れた熱伝導性(熱引け性)を有する内燃機関用バルブガイドを容易に得ることができる。【選択図】図1 |
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