| 摘要 |
A gearbox permits easy assembly, simple structure, reduced number of parts required, and facilitated service of chains and sprockets in an automobile power unit; having a worm provided as one end of the main shaft in the gearbox to protrude out of the bearing; whereby a space being defined on the gearbox to accommodate a active lever provided with gear tooth to mate the worm, another end of the active lever coupled to tachometer wire to transmit rpm of gears in the gearbox to the tachometer.
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