Shaft
Engine Engine PartsShaft intro
- Types
- Materials
- Standard sizes
- Stresses
- Design stresses
Types:-
They are mainly classified into two types:
1: Transmission shafts
Transmission shafts are used to transmit power between the source and the machine absorbing power;
1.1:counter shafts
2:Machine shafts
Machine shafts are the integral part of the machine itself;
2:1crankshaft
Materials:-
1:Mild steel.
2:Alloy steel.
3:Nickel-chromium.
4:Chromium-vanadium steel.
Standard sizes[2]:-
1: Machine shafts
- Up to 25 mm steps of 0.5 mm
- 25 to 50 mm steps of 1 mm
- 50 to 100 mm steps of 2 mm
- 100 to 200 mm steps of 5 mm
2:Transmission shafts[edit]
- 25 mm to 60 mm with 5 mm steps
- 60 mm to 110 mm with 10 mm steps
- 110 mm to 140 mm with 15 mm steps
- 140 mm to 500 mm with 20 mm steps
The standard lengths of the shafts are 5 m, 6 m and 7 m.
Stresses:-
The following stresses are induced in the shafts.
1:Shear stresses due to the transmission of torque (due to torsional load).
2:Bending stresses (tensile or compressive) due to the forces acting upon the machine elements like gears and pulleys as well as the self weight of the shaft.
3:Stresses due to combined torsional and bending loads.
3:Stresses due to combined torsional and bending loads.
Design stresses:-
The maximum permissible (design) stresses in bending (tension or compression) may be taken as:
1. 112 N/mm2 for shafts with allowance for keyways.
2. 84 N/mm2 for shafts without allowance for keyways.
The maximum permissible (design) shear stresses may be taken as:
1. 56 N/mm2 for shafts with allowance for keyways.
2. 42 N/mm2 for shafts without allowance for keyways.
