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 2007-01-0633 A Study of Durability Problems and Solutions for Vehicle Hub Bearing Byunghoon Min Hyundai Motor Company Reprinted From: Accelerated T esting and Vehicle Reliability (SP-2062) 2007 World Congress Detroit, Michigan April 16-19, 2007 Downloaded from SAE International by University of Wisconsin - Madison , Sunday, September 09, 2018By mandate of the Engin eering Meetings Board, th is 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 of the 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]: 724-776-3036Tel: 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: Customer [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 discussions will be printed with the pap er if it is publishe d in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publication by SAE should send themanuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by University of Wisconsin - Madison , Sunday, September 09, 2018ABSTRACT Noise from hub-bearings of used vehicles originates from various sources as the seal, capacity, shape of related parts, lot characteristics, production quality, test method, and lack of tightenin g torque. To investigate the effect of each source on the durability of hub-bearings, used cars as well as par t and actual car’s accelerated durability tests are performed. In this investigation, load conditions around the hub in various field conditions are analyzed, followed by the improv ement of ideal life-cycle equation and part durability test procedure. A new process including design, test, quality and production guidelines are suggested for hub-bearing durability improvement. INTRODUCTION Hub bearing is a conn ector between the rotating hub of the suspension and the stationary knuckle such that the engine torque can be transferred to the tire. Bearing needs to overcome the exte rnal forces and pollution in meeting the durability target of the vehicle. Vehicles operating under various conditions therefore are subject to customer complaints and the problem has cost much for the manufacturers. The bearings in turn have evolved from 1st generation to the 3rd generation to resolve the durability issue. Current investigation is aimed at providing guidelines for preventing the various field problems caused by hub bearings. 1. PROBLEM DEFINITION Hub bearing is composed of inner bearing, outer bearing and the seal. The engine torque is transferred to the driveshaft via transmission, which is then used to drive the tires through the hub. Hub bearing ro tates between the hub and the stationary knuckle while sustaining the weight of the vehicle. Ma in noise issue of the hub bearing can be traced to the underbody of the vehicle during driving. The failure of the hub bearing is thus equivalent to noise generation. Failure modes that generate noise need to be addressed to counter the field problems. Another type of problem occurs from the spraying of the l