Tolerance Analysis of Mechanisms Taking into Account Joints with Clearance and Elastic Deformations

DS 58-5: Proceedings of ICED 09, the 17th International Conference on Engineering Design, Vol. 5, Design Methods and Tools (pt. 1), Palo Alto, CA, USA, 24.-27.08.2009

Year: 2009
Editor: Norell Bergendahl, M.; Grimheden, M.; Leifer, L.; Skogstad, P.; Lindemann, U.
Author: Stuppy, Julia; Meerkamm, Harald
Section: Design Methods and Tools
Page(s): 489-500

Abstract

Geometrical deviations can influence the functionality of technical systems in motion. Geometrical deviations due to manufacturing discrepancies are limited by tolerances which are defined during the design process. For cost-efficient tolerance allocation, it is important to evaluate the impact of possible geometrical deviations on the functionality of the whole system as soon as possible. In this paper, an integrated tolerance analysis approach is developed for a crank mechanism which is subject to time-depending operating conditions and whose components have time- and load-depending positions. The analysis results are the crank angle depending variation of the defined functional di-mension (piston position) and the influence of each toleranced parameter. The tolerance analysis model takes into account link length deviations, clearance at the conrod big end bearing and elastic deformation of the crankshaft.

Keywords: tolerance analysis, motion behavior, clearance, elastic deformation, crank mechanism

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