Schaeffler Technologies Ag & Co .kg

Volker Schmidt

Wolfgang Christgen

Juergen Weber

Frank Himsel

Michael Berger

Arndt Ihlemann

Thomas Werblinski

Matthias Becker

Rainer Schwinn

Michael Kugler

Michael Schober

Max Schafer

The invention relates to a hydraulic camshaft adjuster () having a stator (), a rotor () rotatable relative to the stator () within a limited angular range, and a hydraulic supply () having two working channels () and a shifting valve (), wherein the two working channels () for adjusting the rotor () relative to the stator () in two opposite directions of action can be connected to a pump () for pressurisation or to a reservoir () for pressure relief, depending on the shifting position () of the shifting valve (), wherein the hydraulic supply () has a return pump () that can be actuated by displacing the shifting valve () between its shifting positions () and by the actuation of which one of the two work-ing channels () can be pressurised for returning the rotor () into a predetermined position.

Camshaft adjuster with reset function

A hydraulic switching assembly for a motor vehicle, having a hydraulic pump () which guides a hydraulic medium from a reservoir () via hydraulic lines () and at least one magnetic valve assembly () including a magnetically actuatable switching valve (), to a switching element () in order to hydraulically actuate the switching element () between two switching positions. A pressure accumulator () and a first check valve () are mounted in a supply line () upstream of the switching valve () in order to realize a reliable temporary supply of oil pressure to the switching element ().

Hydraulic switching assembly for a motor vehicle

A variable valve train () of a combustion engine for applying a load on two equally acting gas exchange valves () for each cylinder of the combustion engine is provided, including a switchable valve train element () with an outer part and an inner part ((), ()) that can move relative to each other allocated to each of the two gas exchange valves (). The outer and inner parts ((), ()) are selectively connectable to each other by an associated coupling slide mechanism (). The valve train () further includes a control shaft (), on which a control cam () is applied for each coupling slide mechanism (), and the control cams contact an outer end face () of the respective coupling slide mechanisms () for displacement thereof in one direction, and the two control cams () can rotate separately from each other on the common control shaft ().

Variable valve train of a combustion engine

The invention relates to a locking device for a switchable valve drive component, including a first locking body and a second locking body which can be brought into engagement with one another or out of engagement in order to couple to one another or to uncouple two component parts arranged movably with respect to one another, wherein at least one of the two locking bodies has at least one curved surface. In order to increase the wear resistance of the locking device, provision is made for at least one of the two locking bodies to have a plurality of curved surfaces of which the respective curvature is described by radii of identical length having constructional center points spaced apart from one another.

Locking device for a switchable valve drive component

A method for mounting a valve train () of an internal combustion engine, having, parallel to a row of cam followers (), a camshaft () which has a cam () per cam follower (), which cam () acts on the roller () of said cam follower (), which camshaft () is supported with respect to the cylinder head () via an axial bearing (), wherein a) the cam followers () are provided presorted into two main groups (A, B); b) the two mounts () of each cam follower () of the first main group (A) run with offset in relation to the longitudinal extent of the cam follower () in the side surfaces () with respect to one another in such a way that an axial line of the pin () differs in the clockwise direction from perpendicular; c) the offset of the second main group (B) differs in the counterclockwise direction from perpendicular, and d) a partial quantity of the first and second main group (A, B) are selected and mounted for each row of cam followers () in order to minimize/compensate for an axial thrust of the camshaft ().

Method for mounting a valve train of an internal combustion engine

A valve drive () of an internal combustion engine which is used to actuate a gas exchange valve () is provided. Displacement of the valve takes place when a cam () is lifted and when a hydraulic force applying device () is lifted. A piston () of the force applying device can be displaced from a first end position (A) to a second end position by feeding a hydraulic medium, which can be pressure-adjusted, from a hydraulic medium line () into a pressure chamber (). The pressure chamber () can be connected to the hydraulic medium line () via a shut-off element () which is open towards the pressure chamber () and which is arranged in the housing () and also by means of at least one passage () in the housing (). The passage () is at least partially blocked by an external casing surface () of the piston () in the first end position (A) thereof.

Valve drive of an internal combustion engine

A variable valve drive () of an internal combustion engine is provided which is used to actuate a gas exchange valve (). Displacement thereof takes place via a cam () generated lift and via a lift generated by a piston () of a hydraulic force applying device (), which is superimposed on the cam lift and which is independent thereof. The hydraulic force applying device is connected to a hydraulic fluid line (S-P) which provides an adjustable hydraulic pressure medium and includes a pressure chamber () which is limited on one side by the piston (), in addition to a hydraulic valve lash compensation device () which includes a working chamber () which is radially defined by a housing (). The housing () is also used to radially define the pressure chamber ().

Variable valve drive of an internal combustion engine

A valve drive () for a cam-operated valve () of an internal combustion engine is provided, in which a closing force is applied to the valve () against the opening direction of the valve () by a valve spring (). The valve drive includes a hydraulic force application device (), with which a force can be applied directly or indirectly against the direction of the closing force onto the valve (), and includes a piston () that is moveable in a displacement direction (R) relative to a cylinder () of the force application device () by the introduction of hydraulic fluid into the pressure chamber () formed between the piston () and the cylinder (). The piston () can move relative to the cylinder () from a first end position (A) into a second end position (B). In order to achieve improved damping of the piston in the region of the end positions, a braking or damping system () is provided with which the movement of the piston () can be braked relative to the cylinder () when a predetermined relative position between the piston () and cylinder () is reached and until one of the end positions (A, B) is reached.

Growing community of inventors

Burgbernheim, Germany

Volker Schmidt