| 摘要 |
Disclosed herein is a compact, lightweight shifting or transmission mechanism with co-axial input and output shafts with each shaft carrying a bevel gear. A clutch collar or clutch dog is splined or connected to the output shaft and has lugs which engage the bevel gear on the input shaft to transfer power from the input shaft to the output shaft. Reverse rotation of the output shaft relative to the input shaft and provision of a neutral condition is afforded by a third shaft which is perpendicular to the input and output shafts and which supports an idler gear movable into and out of engagement with the bevel gears in response to axial movement of the third shaft. When it is desired to obtain neutral, or to reverse the direction of rotation of the output shaft, initial movement of the third shaft toward the input and output shafts engages a cam surface at the end of the third shaft with a cam follower on the clutch dog to move to clutch dog axially out of engagement with the gear on the input shaft and thus to obtain a neutral condition by disconnecting the input and output shafts. Continued movement of the third shaft provides for engagement of the idler gear with the gears on the input and output shafts and results in power transfer through the idler gear.
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