A valve opening and closing timing control apparatus includes a driving-side rotational body, a driven-side rotational body, a cylindrical member provided at an inner portion of the driven-side rotational body, a bolt including a cylinder shaft portion, an advanced angle flow passage and a retarded angle flow passage, an introduction passage bringing the working fluid supplied from an outside to flow, a first connection passage bringing the working fluid at the introduction passage to flow to an inner side of the cylinder shaft portion, a second communication passage and a third communication passage arranged at the cylinder shaft portion, and a control valve element provided at the inner side of the cylinder shaft portion, the second communication passage and the advanced angle flow passage being in communication with a void provided between the bolt head and the cylindrical member and between the cylinder shaft portion and the driven-side rotational body.

A camshaft phaser includes a stator having a plurality of lobes and a rotor coaxially disposed within the stator and having a plurality of vanes interspersed with the lobes defining a plurality of alternating advance chambers and retard chambers such that a phasing valve supplies and vents oil to and from the advance and retard chambers. A first check valve allows oil to flow from only one of the retard chambers to only one of the advance chambers when a first diverter valve permits communication between the one of the advance chambers and the first check valve and a second check valve allows oil to flow from the one of the advance chambers to the one of the retard chambers when a second diverter valve permits communication between the one of the retard chambers and the second check valve.

A camshaft adjusting device including a vane cell adjuster with a stator which can be connected to a crankshaft of an internal combustion engine and with a rotor which is rotatably mounted in the stator and can be connected to a camshaft. The camshaft adjusting device also includes a central locking device for locking the rotor in a central locking position relative to the stator. In one or more of the vanes together: at least two pressure medium lines are provided, each of which fluidically connects two working chambers with different working directions to each other. Non-return valves with different working directions are provided in each pressure medium line, each non-return valve allowing a flow of the pressure medium between the working chambers in one direction and preventing the flow in the respective other direction depending on the rotational direction of the rotor relative to the stator. A first switchable valve device is provided in the respective other vanes which are not provided with non-return valves, the valve device allowing a flow of the pressure medium between the working chambers with different working directions in one switch position.

A hydraulic valve, in particular for a phaser of a cam shaft, the hydraulic valve including a bushing including a piston that is displaceable in a bore hole along a longitudinal direction; a supply connection configured to supply a hydraulic fluid; at least a first operating connection and a second operating connection; and at least one tank drain configured to drain the hydraulic fluid, wherein the first operating connection and the second operating connection are alternatively connectable with each other and/or with the supply connection and/or with the at least one tank drain through at least one check valve by displacing the piston.

A piston for a hydraulic valve of a rotation phaser, wherein the piston is configured hollow cylindrical, wherein the piston is axially movable in a central opening extending along a first longitudinal axis of a housing of the hydraulic valve, wherein operating connections of the housing are opened and closed according to a position of the piston, wherein the piston includes check valves which prevent an unintentional outflow of a hydraulic fluid flowing through the piston from an inner cavity of the piston in flow through openings of the piston associated with the operating connections, wherein the piston is configured with check valves in its inner cavity that open towards its interior cavity, wherein the check valves are fixated by a spacer element that is arranged between the two check valves. The invention also relates to a hydraulic valve for a rotation phaser of a cam shaft.

The present disclosure provides an oil control valve with an end oil supply and an assembling method for the same, the oil control valve includes: a valve body, provided with an oil inlet at one axial end thereof; a compression spring located in the valve body and being in a compressed state; and a filter for filtering hydraulic oil flowing from the oil inlet into the valve body, wherein the filter comprises an annular body portion and a strainer fixedly disposed on the annular body portion; the filter is located in the valve body, the compression spring is located on a side of the filter far away from the oil inlet and stands against an end surface of the annular body portion; an inner circumferential surface of the valve body is provided with a clamping slot; and the filter further comprises a bump, the bump protrudes from an outer circumferential surface of the annular body portion and outwardly extends into the clamping slot along a radial direction. Technical solution of the present disclosure simplifies structure of an oil control valve, thus assembling process is simplified, assembling time is shortened, and cost is reduced.

A phaser which has three camshaft start positions at start-up during cranking before the engine can fire. By having three possible start positions of the phaser, there is an increase in flexibility of the cam position at startup during cranking. The three start positions can also be achieved in open loop, reducing the complexity of the control system needed at cranking.

A camshaft phaser for variably adjusting the control times of gas exchange valves of an internal combustion engine, including: a stator and a rotor which can be rotated relative to the stator, wherein a plurality of hydraulic chambers are formed between the stator and the that are separated by radially inwardly projecting webs of the stator. Radially outwardly projecting vanes are formed on the rotor that divide each of the hydraulic chambers into first and second groups of working chambers with an opposing effective direction. A pressure medium pump is adapted to apply a pressure medium to the working chambers. A central valve controls the oil pressure in the working chambers. The pressure medium pump is directly connected to the working chambers in each ease via a pressure medium channel; the central valve is connected to the working chambers via discharge channels; and the central valve exclusively controls the pressure medium discharge from the working chambers.

A phasing mechanism for an internal combustion is provided. The phasing mechanism includes a stator, a rotor configured to rotate relative to the stator, a first plurality of rolling elements configured to engage and move the rotor in a first rotational direction, a second plurality of rolling elements configured to engage and move the rotor in a second rotational direction, and a piston configured to be hydraulically actuated in: i) a first axial direction to move the rotor in the first rotational direction, and ii) a second axial direction to move the rotor in the second rotational direction.

A phase adjuster is disclosed herein that generally includes multiple stamped components and limits threaded connections between components. According to one aspect, this configuration provides a cost-effective arrangement in which a drive nut can adjust a phase between an input gear and an output gear.