Development of Resin Overlay Bearing Material for Recent Automotive Engine

Paper #:
  • 2017-01-0460

Published:
  • 2017-03-28
Abstract:
Recent development trends for automotive engines, arising in part from environmental issues and regulations, show increased development of hybrid vehicles and low fuel consumption vehicles. For example, the increase in use of start-stop engines and downsizing for weight reduction are progressing. As a result, the operating conditions for engine bearings are inevitably becoming more severe. For example, start-stop engines are subject to many more starting and stopping cycles over their lifetime than conventional engines .The lubrication oil present between the bearing and shaft is squeezed out, and the shaft comes into direct contact with the bearing. This could cause the increase in the wear amount of the bearing. It is confirmed that the resin overlay has superior wear resistance for wear caused by start-stop. The cast iron shaft without quenching treatment has been used in the engines for the cost reduction. Increase in the wear amount cannot be suppressed by the conventional resin overlay because the cast shaft has low hardness and burrs are likely to be formed after abrasive finishing. Therefore, the resin overlay with the improved wear resistance achieved by adding hard particles was developed. Based on this background, the resin overlay with the improved wear resistance achieved by adding hard particles and the improved seizure resistance achieved by adding nanoparticle and was developed. The resin overlay under development showed better wear and seizure resistance than the conventional resin overlay in the rig test. We are able to confirm a good result on engine test and confirm the feasibility.
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