Schaeffler Technologies Ag & Co .kg

David Koehler

Jens Hoppe

Christian Berft

This disclosure relates to a control valve for a hydraulic camshaft phaser. The control valve includes a screw body having a cavity, a plurality of connections opening into the cavity, and a sleeve-shaped hydraulic guide element firmly inserted radially inside the cavity. At least part of the hydraulic guide element consists of plastic. The hydraulic guide element includes a plurality of pressure medium channels which open into its radial interior, each of which is connected to at least one of the connections. A control piston is displaceably accommodated in the hydraulic guide element, and, depending on the position of the control piston, connects the connections to each other. A sealing contour provided on a radial outer side of the hydraulic guide element contacts the screw body, sealing the pressure medium channels with respect to each other and/or with respect to axial ends of the hydraulic guide element.

Control valve with a sealing contour on a sleeve-shaped hydraulic guide element; and component having a control valve and camshaft phaser

A control valve () for a camshaft adjustment device, and to an internal combustion engine having a camshaft adjustment device and a control valve () is provided. The control valve () includes a valve housing () and a pressure medium guiding insert () arranged coaxially in a recess of the valve housing (). A discharge passage () of the pressure medium guiding insert () transitions into a discharge duct () running in the axial direction, wherein the discharge connection T can be connected to the control connections A, B and wherein the discharge connection T is arranged in a region between the second end (), which is opposite the first end (), and the control connections A, B.

Control valve having an outflow channel

A control valve for a camshaft adjuster is provided. The control valve contains a hollow cylindrical control piston, which has radially arranged piston openings on a piston head of the control piston, which piston head has a reduced diameter in comparison with the adjacent segment. Pressure medium flows along the outer cylindrical surface of the control piston, reaches into the piston openings, and causes a flow force that depends on the relative position of the control piston in the circumferential direction. For the purpose of weakening this dependence, the piston openings and sleeve openings are distributed over the circumference, wherein the angle between the axes of the piston openings differs from the angle between the axes of the sleeve openings and wherein the same angle range covered by the piston openings and sleeve openings at the same time, in dependence on the position of the control piston in relation to the control sleeve, remains approximately the same.

Control valve for a camshaft adjuster

A central valve () for a camshaft adjusting device including a control piston () having a first () and a second () control edge which enclose a first annular groove (), including a valve housing (), on the peripheral wall of which openings () are disposed, and including pressure medium paths extending between a feed connection and a discharge connection P, T of which the adjustable configuration is predetermined by the control edge geometry and the arrangement of the openings () and the adjusted configuration is dependent upon the relative axial position of the control piston ().

Central valve for a camshaft adjuster having central locking

Control valve for a device, in particular for a hydraulic control device, for variably setting the control times of gas exchange valves in internal combustion engines, including a housing component, a control piston and a retaining ring, the control piston being movably mounted, loaded by a spring, on the one hand, and limited with the aid of the retaining ring, on the other hand, the retaining ring projecting over the control piston in the radial direction and being fixable in the axial direction in a recess in the housing component, and a control sleeve and a plastic shell surrounding the control sleeve being provided between the control piston and the housing component, and the retaining ring being axially attachable to the plastic shell in addition to being fixable to the housing component, and limiting the movement of the control piston and/or the control sleeve.

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Egloffstein, Germany

David Koehler