Rotating member, housing, bearing, gearbox, rotating machine, shaft structure, and surface treatment method

Abstract

In a rotation member ( 5 ) rotatably engaged with a housing ( 3 ), a pulsing electric discharge is generated in a processing liquid or in a gas, between an electrode and the rotation member ( 5 ). The electrode is a chemical compound from metallic powder or metal, or a molded body formed by molding ceramic powder, or a molded body obtained by heating the molded body. Energy of the electric discharges causes coating to be formed on an engagement portion ( 15 ) engaging the housing ( 3 ), the coating formed from the material of the electrode or a substance to which the electrode material combined by the energy of the electric discharges.

1 - 20 . (canceled)  
   
   
       21 . A rotation member applied to and rotating in a housing, comprising: 
 an engaging portion rotatably supported by the housing; and    a coating covering the engaging portion and including one or more wear-resistant materials selected from the group consisting of Si, cubic BN, TiC, WC, SiC, Cr 3 C 2 , ZrO 2 —Y and TiB, the coating being deposited from a tool electrode including the wear-resistant materials by processing the engaging portion as a workpiece with electric spark machining.    
   
   
       22 . The rotation member of  claim 21 , wherein the coating includes one or more solid lubricants selected from the group consisting of hexagonal BN, MoS 2 , Cr 2 O 3 , WS 2  and BaZrO 4 .  
   
   
       23 . The rotation member of  claim 21 , wherein the coating consists essentially of one or more wear-resistant materials selected from the group consisting of Si, cubic BN, TiC, WC, SiC, Cr 3 C 2 , ZrO 2 —Y and TiB and one or more solid lubricants selected from the group consisting of hexagonal BN, MoS 2 , Cr 2 O 3 , WS 2  and BaZrO 4 .  
   
   
       24 . The rotation member of  claim 21 ,wherein the electric spark machining is carried out with rotating the rotation member.  
   
   
       25 . The rotation member of  claim 21 , wherein the engaging portion includes a groove configured to pool a lubrication liquid.  
   
   
       26 . A housing for rotatably supporting a rotation member, comprising: 
 a supporting portion configured to rotatably support the rotation member; and    a coating covering the bearing and including one or more wear-resistant materials selected from the group consisting of Si, cubic BN, TiC, WC, SiC, Cr 3 C 2 , ZrO 2 —Y and TiB, the coating being deposited from a tool electrode including the wear-resistant material by processing the bearing as a workpiece with electric spark machining.    
   
   
       27 . The housing of  claim 26 , wherein the coating includes one or more solid lubricants selected from the group consisting of hexagonal BN, MoS 2 , Cr 2 O 3 , WS 2  and BaZrO 4 .  
   
   
       28 . The housing of  claim 26 , wherein the coating consists essentially of one or more wear-resistant materials selected from the group consisting of Si, cubic BN, TiC, WC, SiC, Cr 3 C 2 , ZrO 2 —Y and TiB and one or more solid lubricants selected from the group consisting of hexagonal BN, MoS 2 , Cr 2 O 3 , WS 2  and BaZrO 4 .  
   
   
       29 . The housing of  claim 26 , wherein the bearing includes a groove configured to pool a lubrication liquid.  
   
   
       30 . A gear box comprising of the rotation member of  claim 21 .  
   
   
       31 . A gear box comprising the housing of  claim 26 .  
   
   
       32 . A shaft structure of variable vanes for regulating a fluid, comprising the rotation member of  claim 21 .  
   
   
       33 . A shaft structure of variable vanes for regulating a fluid, comprising the housing of  claim 26 .  
   
   
       34 . A method for a surface treatment of a shaft or a bearing, comprising: 
 setting a tool electrode including one or more materials selected from the group consisting of Ti, Si, cubic BN, TiC, WC, SiC, Cr 3 C 2 , Al 2 O 3 , ZrO 2 —Y, TiN, TiB, hexagonal BN, MoS 2 , Cr 2 O 3 , WS 2  and BaZrO 4 ;    setting the shaft or the bearing as a workpiece; and    forming a coating deposited from the tool electrode on the workpiece by electric spark machining.    
   
   
       35 . The method of  claim 34 , wherein the forming includes rotation of the workpiece.  
   
   
       36 . The method of  claim 34 ,wherein the tool electrode includes one or more wear-resistant materials selected from the group consisting of Ti, Si, cubic BN, TiC, WC, SiC, Cr 3 C 2 , Al 2 O 3 , ZrO 2 —Y, TiN and TiB and one or more solid lubricants selected from the group consisting of hexagonal BN, MoS 2 , Cr 2 O 3 , WS 2  and BaZrO 4 .  
   
   
       37 . The method of  claim 34 , further comprising: 
 molding the tool electrode from powder of including one or more wear-resistant materials selected from the group consisting of Ti, Si, cubic BN, TiC, WC, SiC, Cr 3 C 2 , Al 2 O 3 , ZrO 2 —Y, TiN and TiB and one or more solid lubricants selected from the group consisting of hexagonal BN, MoS 2 , Cr 2 O 3 , WS 2  and BaZrO 4  by compressing.    
   
   
       38 . The method of  claim 34 , wherein the forming is carried out in an electrically insulating liquid or an electrically insulating gas at an atmospheric pressure.  
   
   
       39 . A shaft processed with a surface treatment by the method of  claim 34 .  
   
   
       40 . A bearing processed with a surface treatment by the method of  claim 34 .  
   
   
       41 . A gear box comprising the shaft of  claim 39 .  
   
   
       42 . A gear box comprising the bearing of  claim 40 .  
   
   
       43 . A shaft structure of variable vanes for regulating a fluid, comprising of the shaft of  claim 39 .  
   
   
       44 . A shaft structure of variable vanes for regulating a fluid, comprising the bearing of  claim 40.