| 摘要 |
In a pulley assembly, an annular joint member (3) made of a high polymer material is disposed between an outer ring (11) of a bearing (1) and a light metal pulley (2). The joint member (3) has a coefficient of thermal expansion larger than that of the pulley (2). The outer ring (11) has a coefficient of thermal expansion smaller than that of the pulley (2). The pulley (2) has an annular boss (21), an annular rim (22), and a plurality of spokes (23) which have side faces each consisting of a surface parallel to an axial direction of the pulley. Front faces of the spokes are positioned on one identical imaginary surface of revolution, and rear faces of the spokes are also positioned on one identical imaginary surface of revolution.
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