Engine Hoist
An engine hoist or crane is a common repair tool that is used in a wide variety of fields such as vehicle repair shops for the purpose of removing or installing engines in a small or crowded vehicle compartments. Engine hoists are also used in small workshops and homes in order to elevate and transport substantially large objects over large distances. In order to improve the efficiency of an engine hoist, the design team has used the SolidWorks model of a 2 ton engine hoist to verify the applied and reaction forces of the hoist design through theoretical calculations. The design for the project must have a factor of safety of 1.5, a maximum loading deflection of 0.625”, the 3 pin locations between the boom extensions and the boom will support the weighted ratings of 2T, 1T, and 0.5T at arm lengths of 48, 56 and 64 inches respectively, with the piston rod of the hydraulic pump can be extended by 0 to 17 inches. If the design of the crane does not meet the required specification, then a redesign will be required in order to meet the requirements for the project. Once this was done static forces were calculated for all six conditions at both the hydraulic cylinder and the crane post. In order to determine the reliability of these results further analysis must be done using Finite Element Analysis (FEA). This concluded that botht he stresses and the deflection were over the design specification and many of the parts had a factor of safety under 1.5 leading us to the conclusion that the original design did not meet the design requirements and would need to be redesigned. The new design has a slight change in material to increse the strength along with cantilever assemblies implemented across the back with the intent to limit and displace the stress of the assembly.