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be tough and fatigue resistant. The crankshafts are generally made of carbon steel, special steel or
special cast iron.
In industrial engines, the crankshafts are commonly made from carbon steel such as 40 C 8,
55 C 8 and 60 C 4. In transport engines, manganese steel such as 20 Mn 2, 27 Mn 2 and 37 Mn 2 are
generally used for the making of crankshaft. In aero engines, nickel chromium steel such as
35 Ni 1 Cr 60 and 40 Ni 2 Cr 1 Mo 28 are extensively used for the crankshaft.
The crankshafts are made by drop forging or casting process but the former method is more
common. The surface of the crankpin is hardened by case carburizing, nitriding or induction
hardening. 32.18 Bearing Pressures and Stresses in Crankshaft
The bearing pressures are very important in the design of crankshafts. The *maximum
permissible bearing pressure depends upon the maximum gas pressure, journal velocity, amount and
method of lubrication and change of direction of bearing pressure.
The following two types of stresses are induced i...
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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