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Prediction of Hydrodynamic Bearing Behaviour for Pre-layout of Cranktrain Dimensions
Technical Paper
2010-01-2186
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Calculating the bearing reliability and behavior is one of the
primary tasks which have to be performed to define the main
dimensions of the cranktrain of an internal combustion engine.
Since the bearing results are essential for the pre-layout of the
cranktrain, the conclusion on the bearing safety should be met as
early as possible. Therefore detailed simulations like T-EHD or EHD
analysis may not be applied to define the dimensions in such an
early development phase. In the frame of this study a prediction
methodology, based on a HD bearing approach, for bearing
reliability of inline-4 crankshafts of passenger cars is proposed.
In this way not only the design phase is shortened but also
achieving the optimal solution is simplified. Moreover the
requirement of a CAD model is eliminated for the preliminary design
phase.
The influencing parameters on the bearing behavior are first
selected and divided into two groups: geometry and loading. The
effect of geometry and loading parameters on the output values are
investigated separately within a DoE variation of beam crankshaft
models. After defining the interactions between input and output
values, empirical equations for predicting the minimum oil film
thickness, specific bearing load and main bearing forces in
vertical and horizontal directions are generated. The bearing
behavior is predicted with the designated tool for the selected
benchmark crankshafts and the results are compared with the
calculation results. For the investigated parameter range ±10%
deviation is observed for the stated output values. Hence the
proposed approach showed potential for the pre-layout of the
cranktrain dimensions concerning the bearing safety.
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Citation
Cevik, M., Hermann, H., and Ritterskamp, C., "Prediction of Hydrodynamic Bearing Behaviour for Pre-layout of Cranktrain Dimensions," SAE Technical Paper 2010-01-2186, 2010, https://doi.org/10.4271/2010-01-2186.Also In
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