2) Two co-axial shafts transmit 40 kW of power at a rotational speed of 1500 revolutions per minute. Coupling and decoupling of the shafts is done by a clutch with friction pads of inner and outer diameters D = 50 mm and D. = 380 mm respectively. The coefficient of friction of the pads is =0.55. The two sides of the clutch are pressed against each other via the force generated by the coil spring seen in Figure Q2. a) State what machine components are the elements denoted by A and B and explain their functional role in this system. [4 marks] b) Calculate the torque transmitted by the clutch and the minimum axial force required to avoid the pads sliding against each other. [5 marks] c) Is section C of the driven shaft subjected to compression due to the axial force in the clutch? Take the diameter of the shaft in section C 25 mm and a design factor of safety of 2.5 and choose from Table 1 a material for the shafts which best suits this application. [5 marks] d) The thread of the section of the driven shaft, adjacent to the left of section C has an outer diameter of 40 mm. If the material of the spring is 8 mm diameter, cold drawn spring steel with elastic moduli E = 207 GPa and G = 80 GPa and the angle of the helix of the un-compressed spring is 15 calculate: the minimum deflection of the spring which prevents the clutch sliding and its un-compressed length. What is the main potential mode of failure of this spring? [6 marks] Driven shaft + 0999 Section C Spline b b b Coil spring B Figure Q2 Friction pads Driving shaft