Lock pin retention plug for a two-step rocker arm assembly

摘要

A lock pin bore (126) in a two-step rocker arm assembly (112) contains a hydraulically-actuable lock pin (128). A return spring (130) urges the lock pin toward an unlatched mode. The bore has one or more annular grooves (154) formed near the outer end of the bore. A plug (136), formed preferably of a soft metal, is pressed as a hydraulic seal into the bore. During assembly, the final position of the lock pin within the bore is set by positioning a stopping assembly fixture (156) into the locking end of the bore. The plug is pressed into the bore until contact is made with the lock pin and the lock pin engages the fixture. The plug is radially deformed into the annular groove(s) to anchor the plug and fix the outer limit of travel of the locking pin and the compressive load on the return spring.