| 摘要 |
PROBLEM TO BE SOLVED: To reduce friction resistance between a belt and an idle pulley without causing the lowering of the durability of the belt.SOLUTION: A plurality of chevron ribs 26 are formed at a belt 17, and a fitting part of an idle pulley 16 is constituted of a plurality of annular protrusions 28 and annular grooves 29 so as to correspond to the ribs. A part of the annular grooves 29 such as right and left both ends out of the plurality of annular grooves 29 of the idle pulley 16 is constituted by being bitten with the chevron ribs 26, regulation faces 30 on which internal peripheries of the chevron ribs 26 abut are formed at the other annular grooves 29. A plurality of the regulation faces 30 can be sequentially connected to one another by cutting the annular protrusions 28 adjacent to the regulation faces 30. |
