A camshaft phaser comprising an advance one-way clutch and a retard one-way clutch. The camshaft phaser comprises an input component arranged to receive torque from an engine, an advance inner ring, a plurality of rollers circumferentially arranged around the advance inner ring, an advance outer ring radially disposed between the input component and the advance inner ring, and an actuation assembly arranged to be disposed within a camshaft, the actuation assembly comprises advance locking pin assemblies arranged in advance channels and an actuator rod. For an advanced mode, the actuator rod is arranged to radially displace advance locking pin assemblies to non-rotatably connect the camshaft and advance inner ring, the rollers ride up ramps on advance outer ring, which expands radially to engage the input component. The retard clutch is substantially similar, and arranged diametrically opposed, to the advance clutch.

A system for controlling valve opening/closing timing that allows an unlocking operation to be reliably performed is configured. When extracting a lock member from a recess, a second control valve is set to an unlock position, a first control valve is set to a predetermined position, and a relative rotation phase is displaced. As a result, the relative rotation phase is displaced in a direction opposite to the direction of displacement by cam average torque from a camshaft. Afterward, by setting the first control valve to a neutral position, the relative rotation phase is displaced by the cam average torque, and when this displacement occurs, a state in which the lock member is separated from an inner wall of the recess is created, thus facilitating extraction of the lock member from the recess.

A valve timing control device 1 has a lock mechanism 30 which limits a relative rotation of a vane rotor 20 with respect to a housing 10 by engaging a lock plate 31 that is accommodated slidably in a radial direction with an engagement groove 32 of the vane rotor 20 by biasing force of a spring 33 in the housing 10. The lock plate 31 is provided with a plurality of penetrating holes 35 which are opened on a circumferential direction side surface of the lock plate 31.

A valve opening/closing timing control device includes: a driving side rotator synchronously rotating with a crankshaft of an internal combustion engine; a driven side rotator coaxially disposed with a rotation axis of the driving side rotator and integrally rotating with a valve opening/closing camshaft; advance and retard chambers formed between the driving side and driven side rotators; a lock mechanism including a lock member capable of engaging with a recessed portion formed on one of the driving side and driven side rotators, and provided in the other of the driving side and driven side rotators; and a connecting bolt coaxially disposed with the rotation axis and connecting the driven side rotator to the camshaft, in which the connecting bolt includes an internal space, a valve unit accommodates a spool, and the spool includes an internal flow path, and, in the spool, a lock holding check valve is disposed.

A valve opening/closing timing control device includes: a driving side rotator synchronously rotating with a crankshaft of an internal combustion engine; a driven side rotator coaxially disposed with a rotation axis of the driving side rotator and integrally rotating with a valve opening/closing camshaft; advance and retard chambers formed between the driving side and driven side rotators; a lock mechanism including a lock member capable of engaging with a recessed portion on one of the driving side and driven side rotators and provided in the other of the driving side and driven side rotators; and a connecting bolt coaxially disposed with the rotation axis and connecting the driven side rotator to the camshaft. The connecting bolt includes an internal space, and an advance port, a retard port and a lock port are formed as through-holes, a valve unit accommodates a spool, and the spool includes an internal flow path.

Provided are a variable valve timing mechanism, an oil pump supplying oil to a hydraulically-actuated device including the variable valve timing mechanism, and a hydraulic control valve which controls oil pressures supplied to a locking mechanism (which includes a locking member configured to fix a phase angle of a camshaft relative to a crankshaft) of the variable valve timing mechanism, an advanced angle chamber and a retarded angle chamber. While an oil pressure in a hydraulic path detected by a hydraulic sensor increases, a hydraulic control valve controller adjusts a degree of opening of a hydraulic control valve according to the detected oil pressure at a time of releasing the locking member from a locking state, to reduce the oil pressure to be supplied to the advanced angle chamber or the retarded angle chamber used to change the phase angle of the camshaft relative to the crankshaft.

Provided is a valve opening/closing timing control device that can speedily achieve a stable operation at the time of starting an engine. The device includes a drive-side rotating body that is rotated in synchronism with a crankshaft and has a plurality of projecting portions, a driven-side rotating body that has a partition portion which forms an advance angle chamber and a retard angle chamber and that is rotated together with a camshaft for valve opening/closing, an intermediate lock mechanism switchable between a locked state and an unlocked state, a pump for supplying fluid to the advance angle chamber, the retard angle chamber or the intermediate lock mechanism, and a communication passage configured to establish communication between the advance angle chamber and the retard angle chamber disposed adjacent in a circumferential direction when the intermediate lock mechanism is under the locked state.

A valve timing control apparatus includes: a drive-side rotational member synchronously rotating with a drive shaft of an internal combustion engine; a driven-side rotational member disposed inside the drive-side rotational member and integrally rotating with a valve opening/closing camshaft; a hydrostatic pressure chamber formed by partitioning a space between the drive-side rotational and driven-side rotational members; an advance angle chamber and a retardation angle chamber formed by dividing the hydrostatic pressure chamber; an intermediate lock mechanism able to selectively switch between locked and unlocked states; an advance angle flow path allowing the hydraulic fluid to be circulated; a retardation angle flow path allowing the hydraulic fluid to be circulated; a control valve having a spool; and a phase control unit controlling the control valve.

The valve open/close timing control device includes a housing that rotates synchronously with a crankshaft, an inner rotor that is disposed inside of the housing and rotates integrally with a camshaft, a fluid pressure chamber formed between the housing and the inner rotor, an intermediate lock mechanism capable of switching between a locked state and an unlocked state, an unlocking channel that allows passage of working oil to be supplied to or discharged from the intermediate lock mechanism, a lock discharge channel that allows passage of working oil discharged from the intermediate lock mechanism, and an electromagnetic valve that controls the supply/discharge of the working oil to/from the fluid pressure chamber and the intermediate lock mechanism. With this valve open/close timing control device, the lock discharge channel allows passage of the working oil in the case where the electricity supply amount to the electromagnetic valve is 0 or the maximum.

A valve opening/closing timing control device is configured to be capable of appropriately setting a valve opening/closing timing within a short period of time from start-up of an internal combustion engine. An advancing chamber and a retarding chamber for relative phase control are formed between a driving rotating body that rotates synchronously with a drive shaft of an internal combustion engine and a driven rotating body that rotates integrally with a valve opening/closing camshaft, and a lock mechanism that locks the relative rotation phase at a locked phase is provided. During start-up of the internal combustion engine, a controller starts fluid-filling control for filling the advancing chamber and the retarding chamber with a fluid, and performs unlock control for releasing a locked state of the lock mechanism before filling of the fluid by the fluid-filling control is completed.