| 摘要 |
In the case of drum brakes having an overrunning unit, complicated devices are necessary to release the overrun brake and make a reverse movement possible. To solve this problem, a freewheel ring (26) is mounted between the brake shoes (14) and the brake drum (22) and, despite the brake shoes (14) having been expanded, it enables the brake drum (22) to execute a reverse rotation (R). <IMAGE>
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