| 摘要 |
<p>A new bench tester (20) for laboratory simulation of piston ring and cylinder wear according to the invention includes tests made using liner segments (49) which bear against a reciprocating piston ring (84). Temperatures up to 550 °C and loads and speeds representative of the most severe top ring conditions may be imposed. A precision oil spray system (106-116) delivers the desired quantity and quality of oil to the wear interface. The computer controlled simulator (20) duplicates the desired test cycle, and displays and stores data on friction forces and friction coefficients as the test proceeds. The invention provides a suitable simulator (20) for production and prototype ring (84) and liner (49) combinations, including ceramic coatings for potential use in advanced diesel engines. The importance of the method of oil delivery on test repeatability is emphasized. Some comparisons with Cameron Plint bench tests and firing engine results are presented and good correlations were found with respect to the relative ranking of material pairs.</p> |
