Abstract
A hydraulic gear motor for pump oil may be run as a component in an endurance type of accelerated life test (ALT) with several different applied stresses. The main failure modes may be first established and the life test developed based upon the failure modes. The purpose of an accelerated test is to demonstrate a minimum life in a simulated customer environment. The operating temperature range for his type of pump is typically -40/spl deg/C to 60/spl deg/C with a steady operating pressure load. The results of a hypothetical 1000 hour life test are shown for clarity. This closes the loop on the larger improvement process. The ALT results in the real world depend upon the applied stresses and should be well-behaved when the test conditions are not excessive or unusual. Simple reliability models may be employed to extrapolate the ALT to other customer conditions. Limits and conditions of the ALT are noted for this type of gear pump operating at pressures of greater than 100 PSI.
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