| 摘要 |
PURPOSE: A crank rod with a deflection angle of a bicycle is provided to increase the efficiency of foot power and to secure smooth rotational force of a chain gear wheel, by separating a crank hub boss part and a pedal-combining hole part from a vertical central line. CONSTITUTION: In a crank rod(3) with a deflection angle of a bicycle, deflection angles are formed to, a hub approach part and a pedal-combining hole approach part, both end parts of a crank for converting user's foot power of vertical motion into rotary motion of a chain gear. In the hub approach part of the crank rod, a deflection angle of 90 ¯45 degrees of a hub boss central horizon and a crank rod central line is formed in the horizontal direction. In the pedal-combining hole approach part of the crank rod, a deflection angle of 90 degrees of the crank rod central line is formed in the opposite direction of the rotation direction.
|
