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Unformatted text preview: MACHINE DESIGN - An 3-3-1 PROBLEM 3-3 Statement: Draw a free-body diagram of the pedal-arm assembly from a bicycle with the pedal arms in the horizontal position and dimensions as shown in Figure P3-1. (Consider the two arms, pedals and pivot as one piece). Assuming a rider-applied force of 1500 N at the pedal, determine the torque applied to the chain sprocket and the maximum bending moment and torque in the pedal arm. Units: N newton kN 10 3 newton . Given: a 170 mm . b 60 mm . F rider 1.5 kN . Assumptions: 1. The pedal-arm assembly is supprted by bearings at A and at B . Solution: See Figure 3-3 and Mathcad file P0303. 1. The free-body diagram (FBD) of the pedal-arm assembly (including the sprocket) is shown in Figure 3-3a. The rider-applied force is F rider and the force applied by the chain (not shown) is F chain . The radial bearing reactions are F ax , F az , F bx , and F bz . Thus, there are five unknowns F chain , F ax , F az , F bx , and F bz . In general, we can write six equilibrium equations for a three-dimensional force system, but in this system there are no forces in the...
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This note was uploaded on 04/26/2010 for the course MAE 3242 taught by Professor N/a during the Spring '10 term at University of Texas-Tyler.
- Spring '10
- Machine Design