| 摘要 |
<p>A central axle control core shifting apparatus used in a speed variator includes a central axle control core and a connecting core for the first and second flywheels. The connecting core for the first and second flywheels is sliding fitted on the central axle control core coaxially. The connecting core has two equally spaced grooves for receiving the ratchet pawls which have upper and lower teeth, and it also has a coil spring groove of the second flywheel, which receives a coil spring of the second flywheel. The central axle control core is installed in the central axle tube of the bicycle to achieve reliable speed variation of the central axle. It has the advantages of avoiding the occurrence of auto-shifting after the bicycle slides for a while, achieving reliable speed variation, and having simple and reasonable structure.</p> |
