Comments on: PRINCIPLES OF JOURNAL BEARING DESIGN http://www.ret-monitor.com/articles/595/principles-of-journal-bearing-design/ Specific mission-critical info for professionals Fri, 18 May 2012 10:26:03 +0000 http://wordpress.org/?v=2.7.1 hourly 1 By: Terry http://www.ret-monitor.com/articles/595/principles-of-journal-bearing-design/comment-page-1/#comment-6170 Terry Sat, 22 Jan 2011 06:07:22 +0000 http://www.ret-monitor.com/articles/595/principles-of-journal-bearing-design/#comment-6170 The soft, low strength very thin surface layers (tin-lead, nickel, copper, etc.) of a typical automotive journal bearing don't have sufficient compressive strength for the loads applied. The perform critical functions such as embedability, improving heat transfer, and providing improved adhesion between layers. The steel backing is what provides the compressive strength. Peak hydrodynamic oil film pressures can easily exceed 20,000 psi, and the bearing will be subjected to a very high number of load cycles. So having a bearing shell material with adequate compressive fatigue strength is very important. The drawback with steel shells is that the steel has relatively low thermal conductivity. The soft, low strength very thin surface layers (tin-lead, nickel, copper, etc.) of a typical automotive journal bearing don’t have sufficient compressive strength for the loads applied. The perform critical functions such as embedability, improving heat transfer, and providing improved adhesion between layers. The steel backing is what provides the compressive strength. Peak hydrodynamic oil film pressures can easily exceed 20,000 psi, and the bearing will be subjected to a very high number of load cycles. So having a bearing shell material with adequate compressive fatigue strength is very important.

The drawback with steel shells is that the steel has relatively low thermal conductivity.

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