Chainwheel for multi-size crank modules

摘要

A chainwheel has a chainwheel body, a first combining hole set and a second combining hole set. The chainwheel body has a center point. The first combining hole set has multiple first combining holes that are formed through the chainwheel body. The first distances between the first combining holes and the center point are equal. The second combining hole set has multiple second combining holes that are formed through the chainwheel body. The second distances between the second combining holes and the center point are equal. The second distance is longer than the first distance. Therefore, the chainwheel can be combined with crank modules of different sizes by the first combining holes and the second combining holes.

主权项

1. A chainwheel comprising:
a chainwheel body being round and comprising
a center point; anda periphery; multiple chain teeth arranged along the periphery of the chainwheel body; a first combining hole set formed through the chainwheel body and comprising multiple first combining holes that are formed through the chainwheel body, wherein
each first combining hole has a center point;a first distance is defined between the center point of each first combining hole and the center point of the chainwheel body; andthe first distances between the center points of the first combining holes and the center point of the chainwheel body are equal; and a second combining hole set formed through the chainwheel body and comprising multiple second combining holes that are formed through the chainwheel body, wherein
each second combining hole has a center point;a second distance is defined between the center point of each second combining hole and the center point of the chainwheel body;the second distances between the center points of the second combining holes and the center point of the chainwheel body are equal; andthe second distance is longer than the first distance.