Figure which is not drawn to scale shows a four-strand, Ask an Expert

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Figure, which is not drawn to scale, shows a four-strand roller chain idler sprocket that rotates on a stationary shaft, supported by two sliding-surface bearings inside the sprocket. The chain transmits 3.7 kW at a chain velocity of 4 m/s, and the sprocket diameter is 122.3 mm. The distance between the inside edges of the sprocket shaft support is 115 mm.

(a) Determine a satisfactory combination of bearing length, diameter, and material.

(b) What considerations other than those taken into account in part (a) might influence the final decision of bearing diameter and length?

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