400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-0790 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2007-01-0734 Analysis of Tapered Roller Bearing Type Hub Separations in Motor Vehicle Crashes Robert J. Pascarella and Sye W. Linovitz Ford Motor Company Nicholas J. Durisek Tandy Engineering & Associates, Inc. Reprinted From: Accident Reconstr uction 2007 (SP-2063) 2007 World Congress Detroit, Michigan April 16-19, 2007 Downloaded from SAE International by Brought to you by the University of Texas Libraries, Sunday, August 05, 2018By mandate of the Engineering Meetings Board, this paper has been approved for SAE publication upon completion of a peer review process by a minimum of three (3) industry experts under the supervision ofthe session organizer. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,without the prior written permission of SAE. For permission and licensing requests contact: SAE Permissions 400 Commonwealth DriveWarrendale, PA 15096-0001-USAEmail: [email protected] Fax: 724-776-3036 Tel: 724-772-4028 For multiple print copies contact: SAE Customer ServiceTel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-0790Email: [email protected] ISSN 0148-7191Copyright © 2007 SAE InternationalPositions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE.The author is solely responsible for the content of the paper. A process is available by which discussionswill be printed with the paper if it is published in SAE Transactions. Persons wishing to submit papers to be considered fo r presentation or publication by SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE.Printed in USADownloaded from SAE International by Brought to you by the University of Texas Libraries, Sunday, August 05, 20182007-01-0734 Analysis of Tapered Roller Bearing Type Hub Separations in Motor Vehicle Crashes Robert J. Pascarella and Sye W. Linovitz Ford Motor Company Nicholas J. Durisek Tandy Engineering & Associates, Inc. Copyright © 2007 SAE International ABSTRACT As part of determining the circumstances of a crash, sometimes components or component assemblies are evaluated to identify if they were damaged as a result of the crash or if they lost function prior to the crash. What role the loss of function may have contributed to the crash is useful in determining if they lost function prior to the crash. The causes and conditions for a brake rotor hub separation from the spindle of a vehicle with tapered roller bearing designs are analyzed through both component level testing and full vehicle testing. Laboratory tests were performed on component assemblies where loads were applied to the wheel assembly and the residual damage to the components was documented. In addition, full vehicle testing was conducted to evaluate the effects of a hub and rotor separation on vehicle control and to document evidence on the components. Real world case studies of hub and rotor separations are presented. The vehicle and scene evidence is evaluated and compared to the controlled test results. INTRODUCTION Automobile crashes can be attributed to one of three factors or a combination of the three factors – driver, vehicle, or environment [1]. In determining the circumstances of a particular crash, the review of each of these three factors is typically performed. Evaluating the vehicle and its potential role after a crash can be difficult due to the damage to the vehicle and its components. If a particular component is damaged in a crash, an analysis can be made to determine whether it was damaged as a result of the crash or it lost function prior to the crash. Observations and forensi