Pedaling produces bending and twisting of the spindle. Consider here only the transverse loading (bending), and...

 

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Pedaling produces bending and twisting of the spindle. Consider here only the transverse loading (bending), and ignore the torsion. Draw the shear force and bending moment diagrams for the spindle from the bearing near the crank (labeled x = 0) to the bearing by the chain ring. There is no force applied to the other pedal, and the chain tensions act in the same plane as the bearing, so they do not contribute to the bending. Let the pedal force be 1000 N. Take the dimensions to be a = 70 mm, b = 25 mm, c = 9.5 mm, d = 80 mm, and L = 170 mm. Pedal Crank Chain ring Prob. 5.36 (Appendix A1) Pedaling produces bending and twisting of the spindle. Consider here only the transverse loading (bending), and ignore the torsion. Draw the shear force and bending moment diagrams for the spindle from the bearing near the crank (labeled x = 0) to the bearing by the chain ring. There is no force applied to the other pedal, and the chain tensions act in the same plane as the bearing, so they do not contribute to the bending. Let the pedal force be 1000 N. Take the dimensions to be a = 70 mm, b = 25 mm, c = 9.5 mm, d = 80 mm, and L = 170 mm. Pedal Crank Chain ring Prob. 5.36 (Appendix A1)

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