Rotary compressor having oxidizing and nitriding surface treatment
AssigneeHitachi, Ltd.
InventorsTadashi Iizuka, Kazushi Fukuda, Shin Ishihara, Yasuo Kamitsuma, Yusaku Nakagawa
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Abstract
A sliding member of an iron-based non-porous material, such as vane, of a rotary compressor has a sliding surface processed by a surface treatment in which the surface is subjected to oxidizing and nitriding to form an oxidized and nitrided layer thereon. The surface is then subjected to a steam-treatment in which water is caused to react with components of the oxidized and nitrided layer to form a layer of oxidized iron of a porous network structure disposed outwardly of the oxidized and nitrided layer. The oxidized iron layer is composed mainly of tri-iron tetroxide and softer than the oxidized and nitrided layer.
Claims15
A compressor including a cylinder, a roller disposed therein in an eccentric relationship thereto, a crankshaft for rotating said roller in said cylinder and a vane disposed in sliding engagement with said roller, at least one of said cylinder, said roller, said crankshaft and said vane comprising a member which is made from a ferrous substantially non-porous material and which has a surface disposed in relative sliding engagement with an associated member, said surface comprising a first porous layer of oxidized iron backed up by a second layer of oxidized and nitrided iron disposed inwardly of said first layer.
A machine including at least one pair of relatively slidable members at least one of which is made from a ferrous substantially non-porous material and has a surface disposed in relatively sliding engagement with an associated member, said surface comprising a first layer of oxidized iron backed up by a second layer of oxidized and nitrided iron formed in said one member inwardly of said first layer.
Dependencies are inferred from the claim text.