A kit including a cam phaser, including a central valve that is configured to distribute a pressure fluid, and an actuator that controls the central valve, a rotor that is rotatably supported in a stator, wherein the cam phaser is driven or drivable by a dry running traction drive, wherein a pressure fluid distribution chamber that is fillable with the pressure fluid through the central valve is provided between the cam phaser and the actuator, wherein the pressure fluid distribution chamber is connected with an armature chamber of the actuator and sealed towards an ambient, wherein the actuator includes at least one armature that is movable by a coil, a pole core and a pole tube that form a pole tube assembly, and wherein the pressure fluid distribution chamber is sealed by a bonded or friction locking and form locking connection of the actuator with the central valve.

A synchronous drive is provided in which a non-circular rotor generates a fluctuating corrective torque to counteract a fluctuating load torque on a driven rotor. The angular orientation of the non-circular rotor can vary relative to the driven rotor so as to change the phase angle of the fluctuating corrective torque relative to the driving rotor. The arrangement may be applied in internal combustion engines with variable valve timing (VVT) systems, wherein the phase angle of a fluctuating load torque presented on a cam rotor, due to forces arising from actuation of intake and/or exhaust valves by the camshaft, varies relative to the crankshaft. The phase angle of the fluctuating corrective torque is also varied relative to the crankshaft to maintain phase relationship with the fluctuating load torque and thereby maintain reduced cam torsional vibrations and span tensions provided by the non-circular rotor during operation.

A torsion spring assembly according to the invention includes a torsion spring having a cylindrical spring body of wound spring wire and with a plurality of torsion spring windings, and having first and second torsion spring ends for taking up forces in a direction of rotation, and a damping spring abutting the torsion spring on the inner side and having a cylindrical spring body of wound spring wire and with a plurality of damping spring windings, and having first and second damping spring wire ends, wherein the damping spring windings have their outer sides extending partially into the space formed between two respectively adjacent torsion spring windings and abutting in particular rounded, round or beveled inner abutment areas of respectively adjacent torsion spring windings with substantially radially outwardly directed bias.

An internal combustion engine includes a cylinder head, a support structure, a cam pulley, and a seal member. The support structure is provided above the cylinder head and supports the camshaft. The cam pulley is provided at an end of the camshaft. A timing belt is wound around the cam pulley. A seal member is provided to cover a gap provided between the cylinder head and the support structure at a facing surface facing the cam pulley. The seal member provides sealing between the cylinder head and the support structure in an axial direction of the camshaft.

A kit including a cam phaser, including a central valve that is configured to distribute a pressure fluid, and an actuator that controls the central valve, a rotor that is rotatably supported in a stator, wherein the cam phaser is driven or drivable by a dry running traction drive, wherein a pressure fluid distribution chamber that is fillable with the pressure fluid through the central valve is provided between the cam phaser and the actuator, wherein the pressure fluid distribution chamber is connected with an armature chamber of the actuator and sealed towards an ambient, wherein the actuator includes at least one armature that is movable by a coil, a pole core and a pole tube that form a pole tube assembly, and wherein the pressure fluid distribution chamber is sealed by a bonded or friction locking and form locking connection of the actuator with the central valve.

A control system for internal combustion engines having four valves per cylinder. An inlet valve and an exhaust valve are controlled by a basic camshaft. Another inlet valve and another exhaust valve are controlled by a control camshaft. The two camshafts are connected to a crankshaft and engine torque is managed by an electronic control unit. The system comprises a motor/generator unit, connected to the control camshaft; a differential, connected to the crankshaft and to the control camshaft; a control shaft, connected to the differential; an actuator, connected to the control shaft; a one-way restrictor valve connected to a shut-off valve and to the actuator; an oil circuit, connected to the actuator by means of the shut-off valve and a control solenoid that acts on the shut-off valve.

The relates to an electromechanical camshaft adjuster comprising an electric motor and an adjusting gear, which has a housing two housing parts, that are sealed off with respect to each other by means of a static seal and with respect to the electric motor and a cylinder head by means of two dynamic seals. A first housing part of the adjusting gear a pot shape that tapers in a stepped manner towards a housing bottom of the housing part, said pot shape having three different inner diameter regions. In the region closest to the bottom with the smallest inner diameter, a stop plate that acts in the circumferential direction is held. In the region with the middle inner diameter, an output ring gear is mounted with play, and in the region with the largest inner diameter, an input ring gear is secured.

An electrically-actuated VCT device cascaded controller, comprises: a system processing device configured to receive inputs from one or more sensors and generate an output signal that is communicated to an electric phaser motor; the system processing device: receives data indicating an angular position of a camshaft relative to an angular position of a crankshaft at a primary control loop; receives data indicating an angular velocity of the crankshaft at a secondary control loop; and generates the output signal that controls the electric phaser motor using the primary control loop and the secondary control loop.

A housing is rotatable synchronously with a crankshaft of an engine. A plurality of external teeth arrangements is respectively shaped into a ring form and is formed integrally with the housing in one piece and is configured to mesh with a plurality of chains, respectively, each of which is wound around the crankshaft or a sprocket that is rotatable. A cam plate is connected to a camshaft of the engine and is rotatable relative to the housing. A plurality of stoppers is formed integrally with the housing in one piece while the stoppers are configured to limit relative rotation between the housing and the cam plate within a predetermined range when the stoppers contact the cam plate. Each stopper is placed at a position, at which the stopper does not overlap with any of the external teeth arrangements in a view taken in an axial direction of the housing.

A synchronous belt drive system having: a synchronous belt with a tensile cord of high-modulus fiber such as glass, carbon, PBO, or aramid; a driver sprocket and at least one driven sprocket, at least one of which is an obround sprocket; and a tensioner having: a base having a cylindrical portion extending axially with a radially outer surface and a receiving portion, an eccentric arm pivotally engaged with the radially outer surface, a torsion spring disposed within the receiving portion, the torsion spring applying a biasing force to the eccentric arm, and a pulley journalled to the eccentric arm. Preferably, no one of the eccentric arm, pulley, or torsion spring is axially displaced along an axis A-A from the others. The obround sprocket has a toothed surface and at least one linear portion disposed between two arcuate portions having a constant radius, the linear portion having a predetermined length.