| 摘要 |
Disclosed herein is a compact, lightweight gear drive for a chain saw which includes a combination cutting chain sprocket and internal gear. The sprocket is in the form of a ring with a plurality of internal teeth which mesh with the teeth of a pinion gear located within the sprocket and driven by the engine. The sprocket has through recesses in its periphery to receive the drive tangs of the cutting chain. In one embodiment, the chain sprocket is supported in eccentric relation to the output shaft of the engine by a hub located interiorly of the internal teeth on the sprocket.
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