Plate-shaped element of belt for belt type continuously variable transmission

Abstract

A plate-shaped element of a belt for a belt type continuously variable transmission. The plate-shaped element is formed of a steel which includes at least one of martensite structure and tempered martensite structure, containing a solid-solution carbon in an amount ranging from 0.4 to 0.7% by weight. The steel has a surface hardness ranging from 55 to 65 in Rockwell hardness C-scale.

1 . A plate-shaped element of a belt for a belt type continuously variable transmission, formed of a steel comprising at least one of martensite structure and tempered martensite structure, containing a solid-solution carbon in an amount ranging from 0.4 to 0.7% by weight, the steel having a surface hardness ranging from 55 to 65 in Rockwell hardness C-scale.  
   
   
       2 . A plate-shaped element as claimed in  claim 1 , wherein the steel further comprises a remainder other than the at least one of martensite structure and tempered martensite structure, the reminder including Fe and inevitable impurities, wherein the steel contains P in an amount of not larger than 0.03% by weight, and S in an amount of not larger than 0.01% by weight.  
   
   
       3 . A plate-shaped element as claimed in  claim 1 , wherein the steel contains austenite structure at time of quenching heating, having an average grain size of not larger than 20 μm.  
   
   
       4 . A plate-shaped element as claimed in  claim 1 , wherein the steel further comprises a remainder other than the at least one of martensite structure and tempered martensite structure, the reminder including Fe and inevitable impurities, wherein the steel contains Ni in an amount ranging from 0.3 to 2.0% by weight, and Mo in an amount ranging from 0.3 to 1.0% by weight.  
   
   
       5 . A plate-shaped element as claimed in  claim 1 , wherein the steel contains carbide having grain sizes of not larger than 10 μm.  
   
   
       6 . A plate-shaped element as claimed in  claim 1 , wherein the steel contains Ti in an amount ranging from 0.03 to 0.2% by weight, and Nb in an amount ranging from 0.03 to 0.2% by weight.