Importance

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Abstract

Among V-faces (48) of a pulley (15), a portion (48a) that is radially further inside than a predetermined position P1 is susceptible to slip against a metal belt (19), but making a shape of the generatrix of the portion (48a) on the radially inner side into a straight line enables a large coefficient of friction against the metal belt (19) to be ensured, thereby reliably preventing slip from occurring. Furthermore, by making, among the V-faces (48) of the pulley (15), a shape of the generatrix of a portion (48b) that is radially further outside than the predetermined position P1 into a curved line that curves in a direction that compensates for misalignment (C) of the metal belt (19) ensures that the metal belt (19) smoothly bites into the V-faces (48), thereby enabling the durability of the metal belt (19) or the pulley (15) to be enhanced. When the shape of the generatrix of the V-faces (48) is a curved line, the coefficient of friction against the metal belt (19) decreases, but since the portion (48b) of the V-faces (48) on the radially outer side is a portion that is naturally resistant to the occurrence of slip of the metal belt (19), there is no possibility of slip occurring even if the coefficient of friction decreases.

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First Claim