The drive of an outboard motor which rotates @ 5,000rpm is supported by a spline in the crankshaft @ the upper end & bearing @ the lower end 560mm apart. (a) If the engine develops 15kW @ this speed, what is the diameter of the solid steel shaft to use? The allowable torsional stress is 80N/mm2 .

The drive of an outboard motor which rotates @ 5,000rpm is supported by a spline in the crankshaft @ the upper end & bearing @ the lower end 560mm apart. (a) If the engine develops 15kW @ this speed, what is the diameter of the solid steel shaft to use? The allowable torsional stress is 80N/mm2 .

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter3: Torsion

Section: Chapter Questions

Problem 3.3.19P: A solid brass bar of diameter d = 1.25 in. is subjected to torques T1as shown in part a of the...

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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

Question

(7) The drive of an outboard motor which rotates @ 5,000rpm is supported by a spline in the crankshaft @ the upper end & bearing @ the lower end 560mm apart. (a) If the engine develops 15kW @ this speed, what is the diameter of the solid steel shaft to use? The allowable torsional stress is 80N/mm2 .

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