Title: Theoretical and practical aspects for balancing crankshafts of six-cylinder V60 degree engines

Authors: C.Q. Liu, Ronald L. Huston

Addresses: NVH Development and Engineering, CIMS 481-47-10, Chrysler LLC, 800 Chrysler Dr., Auburn Hills, MI 48326-2757, USA. ' Department of Mechanical Engineering, University of Cincinnati, P.O. Box 210072, Cincinnati, OH 45221-0072, USA

Abstract: 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.

Keywords: six-cylinder engines; counterweighted crankshafts; balance machines; ring weights; vehicle vibration; V60 degree engines; rotating mass; reciprocating mass; dynamic balancing.

DOI: 10.1504/IJVNV.2011.039055

International Journal of Vehicle Noise and Vibration, 2011 Vol.7 No.1, pp.68 - 89

Available online: 14 Mar 2011 *

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