VALVE OPENING/CLOSING TIMING CONTROLLER

摘要

A valve opening/closing timing controller capable of suppressing the entry of foreign matter into the sliding parts of a lock member by suppressing the deposition of foreign matter in an engagement recessed part and having a lock mechanism capable of reducing the sliding resistance of the lock member. The lock mechanism (5) comprises a sliding groove (52) formed in an outer rotor (2), the lock member (53) slidable along the sliding groove (52), and the engagement recessed part (51) formed in an inner rotor (3), formed so that the lock member (53) can be engaged therewith in the locked state of a relative rotation phase, and having an inflow port (58) allowing a working fluid to flow therein. A working fluid flow passage (57) formed along the sliding direction of the lock member (53) and communicating with the engagement recessed part (51) is formed in at least one of the sliding groove (52) and the lock member (53).