An algorithm for obtaining conditional wear diagram of IC engine crankshaft main journals

Abstract

Since crankshaft main journals belong to a group of highest loaded engine parts, it is very important to know forces acting on them. If a polar load diagram for each main journal is known, then the forces are fully defined. Using polar load diagrams, a conditional wear diagram for each main journal can be constructed, with a help of which one can predict how their surfaces are worn around the circumference. The authors have developed an algorithm for obtaining conditional wear diagrams of main journals, observing a crankshaft as a statically indeterminate continuous beam. The essence of the algorithm, tailored to its software implementation, has been shown in the scope of the paper. The authors have also performed the implementation by creating appropriate computer programs. The programs have been applied on the example of a six-cylinder diesel engine crankshaft and the results obtained are given in the paper.

Keywords

• crankshaft
• main journal
• conditional wear diagram
• statically indeterminate method