A steel shaft 800 mm long transmitting 15 kW at 400 r.p.m. is supported at two bearings at the two ends. A gear wheel having 80 teeth and 500 mm pitch circle diameter is mounted at 200 mm from the left hand side bearing and receives power from a pinion meshing with it. The axis of pinion and gear lie in the horizontal plane. A pulley of 300 mm diameter is mounted at 200 mm from right hand side bearing and is used for transmitting power by a belt. The belt drive is inclined at 30° to the vertical in the forward direction. The belt lap angle is 180 degrees. The coefficient of friction between belt and pulley is 0.3. Design and sketch the arrangement of the shaft assuming the values of safe stresses as : τ = 55 MPa; σt = 80 MPa. Take torsion and bending factor 1.5 and 2 respectively.
A steel shaft 800 mm long transmitting 15 kW at 400 r.p.m. is supported at two bearings at the two
ends. A gear wheel having 80 teeth and 500 mm pitch circle diameter is mounted at 200 mm from the
left hand side bearing and receives power from a pinion meshing with it. The axis of pinion and gear
lie in the horizontal plane. A pulley of 300 mm diameter is mounted at 200 mm from right hand side
bearing and is used for transmitting power by a belt. The belt drive is inclined at 30° to the vertical in
the forward direction. The belt lap angle is 180 degrees. The coefficient of friction between belt and
pulley is 0.3. Design and sketch the arrangement of the shaft assuming the values of safe stresses as :
τ = 55 MPa; σt
= 80 MPa. Take torsion and bending factor 1.5 and 2 respectively.
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