A camshaft phaser is provided that includes a stator, a rotor having a plurality of vanes that form fluid chambers with the stator, and a timing wheel attached to the rotor via a spline joint arranged between the rotor and timing wheel. The spline joint is configured to prevent axial and radial movement of the timing wheel relative to the rotor.

A hydraulic fluid control valve (HFCV) configured to recirculate an exiting hydraulic fluid from a first hydraulic actuation chamber to a second hydraulic actuation chamber is provided. The HFCV includes a selectively movable spool having an inner fluid chamber configured to receive and deliver the exiting hydraulic fluid to one or both of either a sump or one of the first or second hydraulic actuation chambers.

A camshaft phaser arrangement configured for a concentric camshaft assembly having inner and outer camshafts is provided. The camshaft phaser arrangement includes a first camshaft phaser, a second camshaft phaser, a coupling, and at least one timing wheel connected to at least one of the first or second camshaft phaser. Each of the camshaft phasers is configured to be connected to either the inner or the outer camshaft. The at least one timing wheel defines at least one cutout that is configured to receive at least a portion of the coupling.

A method for generating a camshaft signature for camshaft positioning calibration for a camshaft included in a combustion engine. The camshaft is adapted to cause a valve to open and close an opening to a cylinder volume of the combustion engine. The combustion engine further includes an intake surge tank adapted for receiving air from the outside environment. The intake surge tank is in fluid connection with the cylinder volume of the combustion engine for providing air for mixing with fuel injected into the cylinder.

A valve timing system including a crankshaft drive gear coupled to the crankshaft in working communication with a crankshaft connecting rod gear further including a primary connecting rod disc with a first-journal, the first-journal configured to receive at least two connecting rods at respective first-rod-ends in a side-by-side orientation and each connecting rod is coupled to a respective one of the intake disc and the exhaust disc via an intake-journal and an exhaust-journal, respectively. At least two secondary connecting rod discs are coupled to at least two plate-shaft drive gears to drive at least two plate-shaft-gears, the two plate-shaft-gears are connected to the two plate-shafts, respectively. At least two plate-shafts are coupled to an intake cam-groove plate and an exhaust cam-groove plate, the intake cam-groove plate and the exhaust cam-groove plate cammingly-manipulate the intake valve stem connector and the exhaust valve connector to drive each valve assembly.

A method of setting a tappet in an engine. The method includes setting a crankshaft at a predetermined crankshaft rotation angle. A cam coupled to the crankshaft is configured to provide cam lobe lift when the crankshaft is set at the predetermined crankshaft rotation angle. The cam lobe lift translates a tappet screw, coupled to the cam, towards a valve by a distance less than a gap defined between the valve and the tappet screw. The method also includes adjusting the tappet screw such that a zero gap tappet clearance is defined between the valve and the tappet screw.

An assembly aid configured to fix the rotational position of rotatably mounted shafts. The assembly aid has at least two parallel mandrels which are connected to one another by way of a bridge, each mandrel being assigned a positioning element which is arranged at least in sections eccentrically with respect to the respective mandrel.

An engine includes a variable valve timing (VVT) mechanism that changes an opening timing or a closing timing of at least one of an intake valve or an exhaust valve in accordance with an operating region of the engine, and an oil jet that injects oil in a piston direction under a pressure of a first predetermined oil pressure or more. The control device of the engine controls supply of an oil pressure to the VVT mechanism in such a manner that an upper limit of an oil pressure used by the VVT mechanism is set to be lower than a first predetermined oil pressure and an operating speed of the VVT mechanism is high in a direction in which an overlap amount between open periods between an intake valve and an exhaust valve increases and is low in a direction in which the overlap amount decreases.

A camshaft phaser arrangement configured for a concentric camshaft assembly having inner and outer camshafts is provided. The camshaft phaser arrangement includes a first camshaft phaser, a second camshaft phaser, a coupling, and at least one timing wheel connected to at least one of the first or second camshaft phaser. Each of the camshaft phasers is configured to be connected to either the inner or the outer camshaft. The coupling includes a coupling ring and at least one coupling pin that torsionally connects the first camshaft phaser to the second camshaft phaser. The coupling provides for radial and axial movement between the first camshaft phaser and the second camshaft phaser.

A method for generating a camshaft signature for camshaft positioning calibration for a camshaft included in a combustion engine. The camshaft is adapted to cause a valve to open and close an opening to a cylinder volume of the combustion engine. The combustion engine further includes an intake surge tank adapted for receiving air from the outside environment. The intake surge tank is in fluid connection with the cylinder volume of the combustion engine for providing air for mixing with fuel injected into the cylinder.