Method for increasing the dynamic stability under load of a toothed structural component

Abstract

A method is proposed for increasing the carbon-content dependent dynamic stability of a toothed structural part, particularly of a toothed wheel. A curve of the carbon content portion in an edge layer of the structural part is adjusted so that the carbon portion, departing form the surface in direction to a core of the structural part, at first increases and as of a certain depth of the layer continuously decreases. Part of the edge of the layer is removed in areas of the structural part whose dynamic stress capacity increases as the carbon content increases on the surface of the structural part.

1 - 5 . (canceled)  
     
     
         6 . A method for increasing a dynamic stability dependent on a carbon content of a toothed structural part made of case hardenable steels, wherein a curve ( 2 ) of the carbon content in an edge layer of the toothed structural part is first adjusted so that the carbon content, departing from a surface in direction of a core of the structural part, at first increases and as of a certain depth of the edge layer continuously decreases, and that subsequently one part of the edge layer in areas of the toothed structural part, particularly in an area of a tooth flank, is removed so that a maximum value of the carbon content be on the surface of the structural part.  
     
     
         7 . The method according to  claim 6 , further comprising the step of producing said curve ( 2 ) of the carbon content in the edge layer of the structural part by means of carburization.  
     
     
         8 . The method according to  claim 7 , surrounding, during carburization, the structural part by a gaseous carburizing agent and varying the carbon content of the atmosphere.  
     
     
         9 . The method according to  claim 8 , further comprising the step of adjusting the carbon content of the atmosphere during a holding phase that follows a cooling phase, to a hardening temperature of the structural part substantially lower than during the carburization.  
     
     
         10 . The method according to  claim 6 , further comprising the step of removing a part of the edge layer to be removed on the tooth flank by means of mechanical processing.  
     
     
         11 . A method for increasing dynamic stability dependent on a carbon content of a toothed structural part made of case hardenable steels, the method comprising the steps of: 
 adjusting a curve ( 2 ) of the carbon content in an edge layer of the structural part so that the carbon content at a surface increases and as of a certain depth of the layer continuously decreases departing from the surface in direction of a core of the structural part; and    removing one part of the edge layer in areas of the structural part, particularly in the area of the tooth flank, so that a maximum value of the carbon content is at the surface of the structural part.