| 摘要 |
The invention comprises a belt tensioner (100) having a pivot arm (10) biase d toward a belt by a torsion spring (30). The tensioner (100) also comprises a one-way clutch (36) coupled with a friction clutch (42). The pivot arm (10) of the tensioner (100) is connected to a one-way clutch (36). The one-way clutc h (36) is cooperatively connected to a friction clutch (42) having a predetermined friction torque caused by frictionally engaged radially extending surfaces. The pivot arm may move relatively freely toward a belt b y operation of the one-way clutch (36). At the limit of arm movement the one-w ay clutch (36) engages, preventing travel away from the belt in an opposite direction. The arm (10) may only travel away from the belt when a belt tensi on torque exceeds the spring (30) force plus a friction torque of the friction clutch (42).
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