PLESE INCLUDE :- DESIGN THE THE SHAFT AND INCLUDE SKETCH TO SCALE OF THE SHAFT S

Question

PLESE INCLUDE :-

DESIGN THE THE SHAFT AND INCLUDE SKETCH TO SCALE OF THE SHAFT SHOWING FILLET SIZE AND KEYWAYS, SHOULDERS AND DIAMETERS , AND SPECIFY THE MATERIAL AND ITS HEAT TREATMENT

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.

Explanation / Answer

Requirements: It is required to design the above shaft by performing the following tasks:
1. Sketch a general shaft layout, indicating means
1.1 to locate the gears and bearings, and
1.2 to transmit the torque.
2. Perform a force analysis to find the bearing reaction forces.
3. Draw shear and bending moment diagrams.
4. Determine the critical locations for stress design.
5. Determine critical diameters of the shaft based on fatigue and static stresses at the critical locations. Use two different fatigue criteria and check the influence on the design.
6. Make any other dimensional decisions necessary to specify all diameters and axial dimensions. Sketch the shaft to scale, showing all proposed dimensions.
7. Check the deflection at the gear, and the slopes at the gear and the bearings for satisfaction of the recommended limits in Table 7

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