Analysis and Measurement of Deformation of Multipoint-Supported Crankshafts

The article presents the results of analyses which showed that the currently used methods for measuring the geometrical condition of execution and bearing mounting of large-size crankshafts do not guarantee complete and appropriate assessment of the shafts’ position in the main bearings due to the occurring elastic deformations caused by the support conditions of the measured object.Additionally, the results of the analyses enabled to determine the most advantageous support conditions, from the point of view of elimination of the shaft’s elastic deformation. A new concept of testing crank web deformation has been presented. The proposed symmetrical method eliminates a number of inconveniences of the existing testing methods and facilitates correct assessment of crankshaft deformation.