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Research Papers

Design of Four Contact-Point Slewing Bearing With a New Load Distribution Procedure to Account for Structural Stiffness

[+] Author and Article Information
Mireia Olave, Xabier Sagartzazu

Department of Mechanical Engineering, IKERLAN Technology Research Centre, 20500 Arrasate, Gipuzkoa, Spain

Jorge Damian

 LAULAGUN, E-20212 Olaberria, Gipuzkoa, Spain

Alberto Serna

Mercedes-Benz Technology Center, Daimier AG, 71063 Sindelfingen, Germany

J. Mech. Des 132(2), 021006 (Jan 26, 2010) (10 pages) doi:10.1115/1.4000834 History: Received June 15, 2009; Revised December 09, 2009; Published January 26, 2010; Online January 26, 2010

This paper proposes a procedure for obtaining the load distribution in a four contact-point slewing bearing considering the effect of the structure’s elasticity. The uneven stiffness of the rings and the supporting structures creates a variation with respect to the results obtained with a rigid model. It is necessary to evaluate the effect of the elasticity on the increase in the contact forces in order to be able to design the slewing bearing and the structures involved in the connection. Depending on the shape of the structures, the contact force value obtained on the most loaded rolling element is different. The evaluation of this maximum force at extreme loads is essential to design the structures joined to the bearing rings. The new elastic model presented in this paper is highly nonlinear so iterative loops are needed in order to obtain a satisfactory solution. At the same time a finite element model (FEM) has been created for the global model, having also represented the rolling elements and their contact with the raceways. The results obtained using the FEM have been correlated with the results of the new procedure.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Single row 4 points contact bearing

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Figure 2

Hexahedral mesh of the model

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Figure 3

Detail of the stresses at the rolling elements, without the inner ring

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Figure 4

Pretension stresses at bolts (a) and the opening of the bolted joint near the hard point (b) (scaling images)

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Figure 5

Iterative scheme for evaluating the force distribution per rolling elements in a rigid model

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Figure 6

Simplification of the elastic bearing connection

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Figure 7

Condensation points of the structure

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Figure 8

External forces applied and the contour conditions

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Figure 9

Forces on the raceways

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Figure 10

Full iterative scheme for evaluating the force distribution per rolling elements in an elastic model

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Figure 11

Assembly of two structures

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Figure 12

Contact forces obtained using the elastic procedure, the rigid procedure, and the FEM

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Figure 13

Contact angles obtained using the elastic procedure, the rigid procedure, and the FEM

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Figure 14

Force distribution variation between the diagonals applying a pure moment

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Figure 15

The ii-es diagonal is more rigid than the is-ei diagonal

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