| 摘要 |
An endless belt ( 11 ) to be provided on a driven pulley ( 4 b) and a pulley rotation support apparatus for supporting the driven pulley ( 4 b). In the pulley rotation support apparatus, there is used a three-point-contact-type or four-point-contact-type radial ball bearing ( 14 b). An offset quantity delta, which is an axial-direction distance between the center alpha of a radial load applied from the endless belt ( 11 ) to the driven pulley ( 4 b) and the center position beta of the radial ball bearing ( 14 b), is set 40% or less of the pitch circle diameter of the radial ball bearing ( 14 b). The radial clearance of this radial ball bearing ( 14 b) is set 0.2% or less of the above pitch circle diameter.
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