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ID: 1858573 • Letter: #

Question

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A shaft is to be designed to support

the spur pinion and helical gear shown in the figure on two

bearings spaced 700 mm center-to-center. Bearing A is a

cylindrical roller and is to take only radial load; bearing

B is to take the thrust load of 900 N produced by the

helical gear and its share of the radial load. The bearing at

B can be a ball bearing. The radial loads of both gears are

in the same plane, and are 2.7 kN for the pinion and 900 N for the

gear. The shaft speed is 1200 rev/min. Design the shaft. Make a

sketch to scale of the shaft showing all fillet sizes, keyways,

shoulders, and diameters. Specify the material and its heat

treatment. All given dimensions are in mm.

Shigley's mechanical

engineering design - Chapter 7- Problem 25

-A torque of 740 kN-mm is transmitted by the shaft.

-The diameters of the pinion and gear are 200 mm and 300 mm,

respectively.

-The design factor is chosen in the range 1.5-2.5.

-Select an appropriate material giving low cost

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