Abstract: A phaser for controlling the timing between a camshaft and a timing gear having a rotor with at least one vane and a stator with at least one recess the phaser allowing limited rotational movement of the rotor with respect to the stator. The vane divides the recess into first and second pockets, wherein the introduction of a fluid into the first pocket causes the rotor to move in a first rotational direction relative to the stator, and in that the introduction of a fluid in the second pocket causes the rotor to move in the opposite rotational direction. A control ring is provided for selectively opening and closing a fluid connection between the pockets to allow fluid to flow between the pockets using the pressure difference of the fluid in each of the pockets to transport the fluid from the one to the other pocket.

Abstract: An oil flow control valve (10) in a combustion engine is operated for affecting a cam phaser (26) disposed at an output side of said oil flow control valve (10). The cam phaser includes a spool (14) disposed in a spool housing (12). The method for operating the valve includes synchronising a displacement of said spool (14) in said housing (12) with combustion demands, and synchronising movement of said spool (14) with oil pressure characteristics on the output side of the oil flow control valve (10).

Abstract: The invention proposes a method and an apparatus implementing said method which solves the problem of misconnected devices in an application where the devices which are subject to potential misconnection are always present in at least dual form.

Abstract: The present invention relates to an oil flow control valve (10) for a cam phaser comprising a spool (18), a spool housing (16) and a check valve (40), wherein the spool (18) comprises a throughbore (60) and the check valve (40) is mounted in the spool housing (16) in that it extends through the throughbore (60) allowing the check valve (40) to be integrated in the housing (16) of the oil flow control valve (10), with the spool (18) reciprocally moving around the check valve (40), in order to avoid any influencing of the equilibrium of a spool (18) when the oil pressure is suddenly changing in the oil flow control valve (10) due to varying efforts in the cam phaser caused by the valve train.

Abstract: A phaser for controlling the timing between a camshaft and a timing gear having a rotor with at least one vane and a stator with at least one recess the phaser allowing limited rotational movement of the rotor with respect to the stator. The vane divides the recess into first and second pockets, wherein the introduction of a fluid into the first pocket causes the rotor to move in a first rotational direction relative to the stator, and in that the introduction of a fluid in the second pocket causes the rotor to move in the opposite rotational direction. A control ring is provided for selectively opening and closing a fluid connection between the pockets to allow fluid to flow between the pockets using the pressure difference of the fluid in each of the pockets to transport the fluid from the one to the other pocket.