ME 651 · Chapter 8
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A 300-mm-wide polyamide A-2 flat belt is used to connect a 100-mm-diameter pulley to drive a larger pulley with an angular velocity ratio of 0.5. The center to center distance is 5.4 m. The angular speed of the small pulley is 1750 rev/min as it delivers 1.5 kW. The service is such that a service factor \(K_s\) of 1.25 is appropriate. Find the \(H_a,n_{fs}\) and belt length.
A flat belt drive is to consist of two 1.2 m diameter cast iron pulleys spaced 4.8 m apart. Select a belt type to transmit 45 kW at a pulley speed of 380 rev/min. Use a service factor of 1.1 and a design factor of 1.0.
A polyamide F-1 flat belt 150 mm wide is used to transmit 1.5 kW under light shock conditions where \(K_s=1.25\). The pulley rotational axes are parallel and in the horizontal plane. The shafts are 2.7 m apart. The 50 mm driving pulley rotates at 1750 rev/min in such a way that the loose side is on top. The angular velocity ratio of 0.5 is used for the driven pulley. The factor of safety is for unquantifiable exigencies. (i) Estimate the centrifugal tension \(F_c\) and the torque T. (ii) Estimate the allowable \(F_1,F_2,F_i\) and allowable power \(H_a\).