| 摘要 |
An oscillating gear ratchet drive unit transmits rotating motion and torque from a drive gear to a driven shaft in a preselected direction of rotation and includes a shaft and a gear operably connected to a drive gear and positioned transversely with respect to the shaft and supported by the shaft. Ratchet crown wheels are provided on the opposing major faces of the gear and have camming surfaces for producing axial movement of the gear on the shaft, with each camming surface terminating in an axial surface. Pins project radially outwardly from the shaft adjacent to each ratchet crown wheel and engage an axial surface to the drive shaft, and are adapted to engage the camming surfaces to move the gear axially whenever the shaft rotates faster than the gear, while also accommodating and limiting axial movement of the gear on the shaft.
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