# Modeling and Design of Undercarriage Components of Large Scale Earthmoving Equipment in Tarsand Operation

CIM Edmonton 2004
Richard Sobieski, Samuel Frimpong,
Abstract Fundamental and applied research work has been carried out by Dr. Jozef Szymanski, Mr.Richard Sobieski and Dr. Samuel Frimpong to advance knowledge frontiers and to create efficient design and/or improvement of undercarriage elements of the large – scale earthmoving equipment in Oil Sands mining operations (authors initiated the program named TUCAT, which stands for; Tarsand Undercarriage Application and Theory). At the end of 2003, in appreciation and recognition of these contributions the “Oil Sands Undercarriage” project won the Cat’s President’s Award. This paper summarizes the major experiences and results obtained up to date in improvements made to the undercarriage components of the earthmoving equipment performing in oilsands operations. 1) A novel method has been developed for predicting the optimum curvature and blade geometry of an earth moving equipment such as bulldozers, motor graders and other relevant equipment. A mathematical relationship has been found which can be used to approximate the optimum blade shape for reducing cutting resistance and fill resistance. The derived blade cutting resistance equation is a function of blade geometry and soil properties, (soil and other similar minerals). This appears to be the first model that can mathematically optimize the shape of a blade of an earth moving equipment. The advantage is that significant saving in undercarriage components can be achieved from reducing the amount of cutting and filling resistance for a this type of equipment working at different soil. 2) Authors invented Sprocket Carrier Roller For a Tracked Vehicle this invention is directed at replacing the conventional cylindrical carrier roller with a sprocket type carrier roller which provides improved support for the drive track and other components of the undercarriage assembly and which will move positively with the drive track as the drive track is advanced over the sprocket carrier roller. 3) A unique retaining pin assembly has been designed for detachably connecting disposable wear parts of earthmoving equipment (such as ripper tip or cover of ripper attachment, etc.). The retaining pin assembly is relatively easy to assemble and disassemble and include parts, which may typically be reused
Keywords: dozer, blade curvature, locking pin, track rollers, contact stresses, undercarriage, sprocket carrier roller, dunamic loads