| 摘要 |
A non-circular sprocket component comprises a rotor ( 11 ) having a plurality of teeth ( 16 ) arranged around the perimeter of the rotor, each tooth having a crown ( 9 ), and each pair of adjacent teeth having a valley ( 8 ) therebetween. The crowns of the teeth lie on a curved envelope forming the perimeter of the motor. The perimeter has a non-circular profile having at least two protruding portions ( 22, 23 ) alternating with receding portions ( 24, 25 ). The distance between the midpoints (V) of the crowns ( 9 ) of each pair of adjacent teeth is substantially the same. The profile of the valley ( 8 ) between each pair of adjacent teeth is substantially the same. The distance between the midpoint (V), of each crown ( 9 ) and the axis (A) of the rotor varies around the perimeter to produce the said non-circular profile.
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