Methods for estimating the durability of the needle bearing of the piston head of the connecting rod of a transportation diesel

The article presents the results of an experimental study and analytical evaluation calculations to check service life increase durability needle bearing piston head connecting rod a transport diesel engine. primary reasons for violation nominal operation main units this mechanism have been established. Corresponding recommendations are proposed carrying out accelerated tests durability, reducing thermal loads and, as consequence, improving quality its entire group. Theoretical methods determining (PHCR) engine proposed. theoretical methodology allows obtaining reliable values taking into account distribution working load over rolling elements, well mobility pin sleeve. performed make it possible correct clarify standard mathematical model PHCR bearing, depending on elements (rollers) under different operating conditions. This technique with acceleration factor 10 is based twofold in force effect bearing. was achieved by assembling using special technology, which described detail work. A significant decrease radial rollers For ensure regular oil supply during operation, developed roller contact zone, significantly influenced made conduct yield. Its operational research experience design work correlate sufficiently explained methods, them be used improvement modernization rods bearings PHCR. That permission use these methodic doing perfect modern connecting-rod piston.
 Keywords: diesel, test procedure, rollers, rod, durability.