Design question. Thanks for helping! A steel shaft of 50 mm diameter is used to

Question

Design question. Thanks for helping!

A steel shaft of 50 mm diameter is used to transmit 20 kW power at 350 rpm to a pulley. A parallel key is required to connect the shaft to the pulley. The permissible shear and crushing stresses for the key material are 42 MPa and 70 MPa respectively. Assume a factor of safety of 2. (a) Determine the torque being transmitted through the key. 5 marks (b) Design a parallel key according to the BS 4235-1:1972 as in Table 1 (specify its width, thickness and length). (10 marks) (c) Accordingly, design the keyway for the parallel key (specify its width, thickness and length). Compute the minimum strength required by the weaken shaft with keyway to resist torsion based on Moore's equation on shaft strength factor: (P)-1.1 (L) e 0.2 10 marks)

Explanation / Answer

a) T=20kw/350(60/2×3.14)

T=5.980Nm

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