Temperature Distributions and Thermal Stresses in a Built-up Crankshaft during Shrinkfitting

Abstract

This paper describes a method of analysis of crankshaft temperature distribution by means of a new theoretical calculation. This method of analysis, not dependent on the results of experiments, is easily applicable to the analysis of temperatures of crankshafts of any size or material.
Temperature distribution of the journal and the crank web at an early stage is given. Then, clearance or contact pressure between the journal and the crank web is calculated on the basis of the thermal expansion. The value of thermal resistance between these two parts is obtained from the value of the clearance or the contact pressure. Boundary conditions around the crankshaft are theoretically obtained as well. By application of these boundary conditions, analysis of temperatures by the finite element method is performed. Temperature distribution after the laps of a short period of time is thereby obtained. On the basis of the new temperature distribution thus obtained, new boundary conditions are calculated. Calculations are performed by repeating the aforementioned procedures.
Good agreement was obtained between the theoretical results and experimental values. As a result, the practicability of this analysis method was verified.