Patent ID: 7673502
Filing Date: 2010-03-09
Classification: F16G

Abstract:
1. A method for inspecting a belt of a continuously variable transmission, the belt comprising an endless ring comprising a thin plate which has undergone a prestress in a compression direction by nitriding treatment, the nitriding treatment, when applied insufficiently, forming a hollow in a surface of the thin plate, the method comprising: measuring a depth of the hollow in the surface of the thin plate, wherein the hollow has a bottom and the depth of the hollow represents a level difference between a reference surface which has undergone a sufficient prestress and the bottom of the hollow; determining a target value of the prestress; determining a permitted minimum value which has a fixed relation to the target value of the prestress; calculating a prestress difference between the target value of the prestress and the permitted minimum value; converting the prestress difference into a predetermined tolerance value; comparing the measured depth of the hollow with the predetermined tolerance value; and determining that the nitriding treatment is insufficient when the measured depth exceeds the predetermined tolerance value.