The valve timing control unit includes a valve timing control mechanism that includes a driving rotary body, a driven rotary body, an electric motor and a deceleration gear each for setting the relative rotational phase of the driving rotary body and the driven rotary body, and a phase sensor unit that detects the actual phase of the driving rotary body and the driven rotary body. The valve timing control unit includes a controller that controls the electric motor to reduce a phase difference between the actual phase and a target phase, and the controller includes a swing controller that swings the target phase in vicinity of the target phase when the target phase is maintained and the actual phase having a fluctuation amount is held in a holding region, in which the fluctuation amount is less than a preset value.

In a valve timing adjustment device, a first arm projection portion that is caught by a terminal hook portion of a spiral spring and urged toward a lock phase side by the spiral spring is installed on a face opposite to the front surface of a plate in a first arm in a case where a rotational phase of a second rotating body with respect to a first rotating body is on a first rotational phase side, and a second arm projection portion that abuts on an outermost peripheral portion of the spiral spring is installed on a face opposite to the front surface of the plate in a second arm in a case where the rotational phase is on the first rotational phase side.

A hydraulic valve for a cam phaser, the hydraulic valve including a bushing including a piston that is movable in a bore along a longitudinal direction; a supply connection configured to feed a hydraulic fluid; a first operating connection and a second operation connection; and a first tank drain connection and a second tank drain connection configured to drain the hydraulic fluid; and a first check valve associated with the first operating connection and a second check valve associated with the second operating connection, wherein the first operating connection and the second operating connection are connectable through at least one of the first check valve and the second check valve alternatively with each other or with the supply connection or with one of the first tank drain connection and the second tank drain connection by moving the piston, wherein the hydraulic valve includes five switching positions.

A variable camshaft timing (VCT) assembly for controlling the angular position of concentric camshafts includes an independent VCT device that is configured to couple with a first concentric camshaft and change an angular position of the first concentric camshaft relative to an angular position of a crankshaft; and one or more dependent VCT devices mechanically linking an output of the independent VCT device with a second concentric camshaft, wherein the dependent VCT device(s) change(s) an angular position of the second concentric camshaft relative to the angular position of the first concentric camshaft based on angular movement of the output of the independent VCT device.

A camshaft phaser, including: a stator arranged to receive rotational torque, including a plurality of radially inwardly extending protrusions, and supported for rotation around an axis of rotation; a rotor including a plurality of radially outwardly extending protrusions circumferentially interleaved with the plurality of radially inwardly extending protrusions, and arranged to non-rotatably connect to a camshaft; a plurality of phaser chambers, each phaser chamber circumferentially bounded by a radially inwardly extending protrusion included in the plurality of radially inwardly extending protrusions and a radially outwardly extending protrusion included in the plurality of radially outwardly extending protrusions; an annular washer; and a target wheel including a first portion axially located between the annular washer and the rotor and in contact with the annular washer, arranged to detect a rotational position of the rotor for use in rotating the rotor with respect to the stator.

A control device for an internal combustion engine includes an internal combustion engine and a valve opening-closing timing control device. The valve opening-closing timing control device has a phase adjustment mechanism for setting a relative rotation phase of a driving-side rotator and a driven-side rotator. The phase adjustment mechanism overlaps a timing of opening an intake valve with a timing of opening an exhaust valve, by setting, in a predetermined period, the relative rotation phase such that the exhaust valve closes after a top dead center position has been reached, and a bypass passage is provided that connects an exhaust passage of one cylinder that is in an exhaust process to the exhaust passage of another cylinder that is in an intake process at the same time as the exhaust process.

A valve timing adjustment device includes a sprocket, a vane rotor and a shim. The sprocket is configured to rotate. The vane rotor is received in the sprocket such that the vane rotor is rotatable relative to the sprocket. The vane rotor includes a supply oil passage that is configured to communicate with an external oil passage, and a rotational phase of the sprocket is changed when the vane rotor is rotated relative to the sprocket. The filter is configured to filter hydraulic oil, which is conducted in a connection oil passage that is configured to connect between the external oil passage and the supply oil passage. The shim is placed between the driven shaft and the filter.

The invention relates to a camshaft adjusting system (1) for an internal combustion engine of a motor vehicle, including a hydraulic camshaft adjuster (2) which has a stator (3), a rotor (4) that is rotatably mounted in the stator (3), and a hydraulic control system (6) that has a valve (5). The rotor (4) has at least one vane which protrudes into a pressure chamber formed between the rotor (4) and the stator (3) such that the pressure chamber is divided into two sub-chambers, each of which interacts with the hydraulic control system (6) such that a hydraulic pressure ratio is established between the two sub-chambers, said ratio specifying a relative rotational position between the rotor (4) and the stator (3), and is adjusted on the basis of the position of the valve (5). The camshaft adjusting system also includes an actuator (7) which is arranged adjacently in the axial direction of the camshaft adjuster (2) and which acts on the valve (5) for adjusting purposes. A hydraulic fluid section (8) is arranged on an actuator (7) face facing the camshaft adjuster (2), with this hydraulic fluid section (8) being designed to deflect a flow of hydraulic fluid exiting the valve (5) into the surroundings of the camshaft adjuster (2) back into the camshaft adjuster (2) in an operational state.

The disclosure relates to a camshaft adjusting device with a dry belt, a central valve arranged within a camshaft adjuster, and an actuator acting on the central valve. An oil-tight wet space is formed by the camshaft adjuster and the actuator or a component supporting the actuator, and oil present in the wet space can be evacuated by means of an oil path. A portion of this oil path extends axially through the output element of the camshaft adjuster. This oil path can pass the end-side contact face between the output element and camshaft, opening out into an axial bore of the camshaft which is distanced radially from the axis of rotation of the camshaft adjusting device. The axial bore runs beneath an oil feed connection formed on the outer surface of the camshaft for feeding oil to the central valve.

A hybrid dual phaser assembly is disclosed for mounting to an engine camshaft to allow the timing of two sets of cam lobes to be phased independently of one another relative to a crankshaft of the engine. The phaser assembly comprises an electrically operated phaser having intermeshing gears for transmitting torque to the camshaft and a phase control input driven by an electric motor to be mounted coaxially with the camshaft, and a hydraulically operated phaser having vanes movable within arcuate cavities. The cavities of the hydraulically operated phaser are defined in part by an annular member that radially surrounds, and axially overlaps, a gear of the electrically operated phaser, which gear is separate from the annular member and forms radially inner boundary walls of the cavities.