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Unformatted text preview: to 47 32.19 Design Procedure for Crankshaft
The following procedure may be adopted for designing a crankshaft.
1. First of all, find the magniture of the various loads on the crankshaft.
2. Determine the distances between the supports and their position with respect to the loads.
3. For the sake of simplicity and also for safety, the shaft is considered to be supported at the
centres of the bearings and all the forces and reactions to be acting at these points. The distances
between the supports depend on the length of the bearings, which in turn depend on the diameter of
the shaft because of the allowable bearing pressures.
4. The thickness of the cheeks or webs is assumed to be from 0.4 ds to 0.6 ds, where ds is the
diameter of the shaft. It may also be taken as 0.22D to 0.32 D, where D is the bore of cylinder in mm.
5. Now calculate the distances between the supports.
6. Assuming the allowable bending and shear stresses, determine the main dimensions of the
Notes: 1. The crankshaft must be designed or checked for at least two crank positions. Firstly, when the cra...
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This note was uploaded on 09/30/2012 for the course MECHANICAL 403 taught by Professor A.thirumoorthy during the Spring '11 term at Anna University Chennai - Regional Office, Coimbatore.
- Spring '11