Keywords: six-cylinder engines, counterweighted crankshafts, balance machines, ring weights, vehicle vibration, V60 degree engines, rotating mass, reciprocating mass, dynamic balancing
Theoretical and practical aspects for balancing crankshafts of six-cylinder V60 degree engines
Owing to manufacturing variations, a counterweighted crankshaft still needs to be dynamically balanced on a balance machine before being put into service. To balance a non-symmetric counterweighted crankshaft, disconnected from the piston and connecting rod assemblies, on a balance machine, it is necessary to attach correct ring weights on crankpins to represent the dynamic effect of the piston and connecting rod assemblies. The central issues are: What should be the sizes and the locations of the ring weights? This paper presents a set of formulae for determining the ring weights needed for balancing crankshafts of six-cylinder V60 degree engines. The paper also discusses practical considerations, such as the design, manufacturing and installation of the ring weights, the method of testing, and subsequent adjustment if needed.