| 摘要 |
A belt ( 3 ) of a continuously variable transmission comprises a pair of endless rings ( 2 a) and plural elements ( 1 ) held between the pair of endless rings ( 2 a). The endless rings ( 2 ) are formed of plural laminated thin plates ( 2 a). A prestress in a compression direction is applied beforehand to the surfaces of the thin plates ( 2 a) by a nitriding treatment. In this process, a defect part ( 2 b) is formed as a hollow in the thin plate ( 2 a) due to scatter in the nitriding treatment. This invention measures the depth of the defect part ( 2 b), and if the measured depth exceeds a predetermined tolerance value, it is determined that the prestress is insufficient. Due to this determination method, a highly precise inspection of the thin plates ( 2 a) forming the endless rings ( 2 ) can be performed in a short time.
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