| 摘要 |
In a motor operated hand-held tool, such as a hammer drill, a drive train transmits driving force from a motor to a drive spindle. The drive train includes a safety clutch positioned on a shaft for interrupting the transmission of driving force if a torque overload occurs. The safety clutch has a hub encircled by a gear ring with spring-biased balls releasably interengaging the hub and ring for transmitting the driving force. The hub is engaged with a thread on the shaft and under normal operation a spring prevents the hub from being rotated relative to the shaft and being displaced axially along the shaft. During torque overload conditions the hub acting against the spring moves axially along the shaft until the hub and gear ring are released.
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