CROSSHEAD PISTON AND BEARING ASSEMBLIES

摘要

A crosshead piston assembly (10) has a piston with an upper head portion (22 ) and a lower stem portion (24) formed with a pin bore (48). The pin bore has a pair of lower, laterally spaced mounting ears (52) presenting a bearing support surface interrupted by a lateral gap (56) between the ears. A saddle (60) is arranged opposite the ears and provides a bearing support surface (6 2) which is continuous along the pin bore. A three-piece slipper bearing set (1 4) is disposed in the pin bore and includes a pair of lower bearing shells (68) seated in the ears and an upper bearing shell (70) seated in the saddle. The upper bearing shell and saddle are formed with aligned oil supply (76) and retaining (80) holes, The oil supply hole is maintained fully open, while a retaining pin (84) is installed in the aligned retenting holes.