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公开(公告)号：EP1864003A1
公开(公告)日：2007-12-12
申请号：EP06707539.0
申请日：2006-03-14
发明人： LÜPFERT, Anja
CPC分类号： F01L1/32 , F01L3/04 , F01L3/06 , Y02T10/146
摘要： The invention relates to a gas shuttle valve for an internal combustion engine comprising a valve cone which substantially consists of a valve shaft projected in a valve disc in such a way that a hollow cone is formed. The valve cone or at least the shaft thereof is made of a typical valve steel consisting of a nitride forming base alloy up to the hollow cone area. The aim of said invention is to improve said gas shuttle valve in such a way that even the parts made of the typical valve steel exhibit a good anti-corrosive protection. For this purpose, the valve cone is provided at least partial area with an anti-corrosive layer in the form of a nitride layer, which is produced by the nitride forming base alloy conversion by plasma nitriding or plasma nitrocarburising in a nitrogenous atmosphere.
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2.发明公开
公开(公告)号：EP1877686A1
公开(公告)日：2008-01-16
申请号：EP06723391.6
申请日：2006-03-14
发明人： LÜPFERT, Anja , KNOBLOCH, Stefan
IPC分类号： F16J9/22
CPC分类号： F16J9/22
摘要： The invention relates to a piston for a reciprocating-piston internal combustion engine which is made of a nitride-forming base alloy and comprises a piston top part (1) provided with several circulatory piston ring grooves (4) and a piston fire land. At least the piston top ring groove (4a) arranged near a combustion chamber is provided with wear-protected hardened slot flanks (5a, b). The aim of said invention is to optimise said piston in such a way that the top part thereof, in particular the top piston ring grooves, exhibits an extended operational lifetime. For this purpose, at least the external surfaces of the piston top part comprising the wear-protected hardened slot flanks and the piston fire land are provided with an additional wear-protective and anti-corrosive layer (7) in the form of a nitride layer which is producible by converting the nitride-forming base alloy by plasma-nitriding or plasma-nitrocarburising in a nitrogen or nitrogen and carbon atmosphere in such a way that the hardened slot flanks are additionally protected by said nitride layer (7)
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