| 摘要 |
A drive gear is freely mounted on a drive shaft and meshes with an output gear on an output shaft. The meshing teeth are slanted so that a load on the output shaft and output gear, produces an axial force component on the driven gear, urging the same into frictional engagement with a threaded nut so that the same is held against rotation, and moves axially to press the drive gear into tight engagement with an abutment on the drive shaft while the rotating drive shaft screws a threaded portion thereof into the nut.
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