Shaft Carrying both pulley and gear | Design of Shaft | Design of Machine Elements

[@gautampal1228]

A shaft carrying a pulley and a gear at either ends is supported in two bearings 1m apart . Pulley and gear are located at 250mm and 350mm from the bearings at respective ends . The shaft transmits 20 kw at 150 rpm . Tangential force at gear acts in upwards direction . Pulley of diameter 1.25m drives another pulley below it . The raio tensions T1 / T2 is 2.5 . The gear and pulley weights 900N and 2700N respectively . Safe shear stress for the shaft is 65MPa . Neglecting weight of shaft , design the shaft diameter . Take shock and fatigue factor for bending and torsion as 2 & 1.5 respectively . 🙏🏻

[@user-tz6zl6gm6j]

sir what to do when it is not given gear is driven or driving but tangential force acts downwards is given so can we neglect radial force?

[@themechanicalengineer]

It depends on the direction of rotation... If tangential force acts in vertical downwards, the radial force will act in the horizontal direction...