VALVE TIMING CONTROL APPARATUS

摘要

A valve timing control apparatus (10) includes: a drive-side rotational member (1, 11) synchronously rotating with a drive shaft (C) of an internal combustion engine (E); a driven-side rotational member (2, 12) disposed inside the drive-side rotational member and integrally rotating with a valve opening/closing camshaft (101, 206); a hydrostatic pressure chamber (4) formed by partitioning a space between the drive-side rotational and driven-side rotational members; an advance angle chamber (41, Ra) and a retardation angle chamber (42, Rb) formed by dividing the hydrostatic pressure chamber; an intermediate lock mechanism (8, L) able to selectively switch between locked and unlocked states; an advance angle flow path (43, 221) allowing the hydraulic fluid to be circulated; a retardation angle flow path (44, 222) allowing the hydraulic fluid to be circulated; a control valve (51, V) having a spool (52, 232); and a phase control unit (90) controlling the control valve.