| 摘要 |
A pulley assembly has a first body to engage a power transmission belt. The first body is rotatable around a first axis. A second body is movable relative to the first body around the first axis. First and second axially spaced elastic members each has a radially inner portion and a radially outer portion. One of: (a) the radially inner portions of the first and second members; and (b) the radially outer portions of the first and second members are: (i) coupled to move together around the first axis; and (ii) each movable relative to the first and second bodies around the first axis. The other of: (a) the radially inner portions of the first and second members; and (b) the radially outer portion s of the first and second members are fixedly coupled, one each to the first and second bodies, to follow movement of the first and second bodies around the first axis.
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