Ina Walzlager Schaeffler Kg

Ina Walzlager Schaeffler Ohg

Ina Schaeffler Kg

Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Schaeffler Technologies Ag & Co .kg

Roussel Uclaf

Dieter Schmidt

Walter Speil

Michael Haas

Dieter Goppelt

Martin Rauch

Michael Zipprath

Peter Sailer

Joachim Seitz

Arndt Ihlemann

Bodo R&ouml;rig

Oliver Schnell

Bodo Rörig

Helmut Engelhardt

Henning Karbstein

Jens Artmann

Thomas Rommer

Bolko Schuseil

Peter Schmitt

Guenther Kostka

Thomas Ullein

Jurgen Rabe

Wolfgang Mayer

Rolf Behrendt

Steffen Hertrich

Reinhard Ammon

Norbert Geheeb

Karl Ludwig Grell

Günther Kostka

Wolfgang Miereisz

Hermann Stief

Jurgen Kretschmer

Gunter Eisenhardt

Bodo Rorig

Werner Barth

The hydraulic play compensation device, having an outer cylinder part which is closed on one side by a base and in which a piston element which lies on its inside is guided so as to be longitudinally displaceable, with a guide gap, having an oil pressure space having an oil inlet which supplies the oil supply space, and having a connecting duct controlled by a nonreturn valve between the oil supply space and the oil pressure space. For optimized removal of air which is introduced via the oil inlet, it is proposed that a ventilation path which connects the oil supply space and the guide gap is formed in the piston element downstream of the oil inlet and upstream of the connecting duct.

Hydraulic play compensation device

A camera for optically capturing a screen, wherein the screen has an area and wherein a predetermined overall resolution is provided for the optical capture, comprises a camera support with an array of camera mounts, an array of optical individual cameras as well as an image processing device for processing digital individual images of the array of optical individual cameras to generate the optical capture of the screen with the predetermined overall resolution. The image processing device is effective to reduce a correction of the individual images with regard to alignment inaccuracies and/or parameter variations, wherein for correction purposes a correction resolution is used, which is higher than the overall resolution, and wherein for every individual camera an individual correction rule is used for the correction. After the correction has been performed, the corrected overall image is brought to the predetermined overall resolution by combining adjacent pixels. Thereby, with inexpensive individual cameras, an image of a large-format screen is obtained efficiently, inexpensively and with little artifacts.

Method and camera (apparatus) for optically capturing a screen

The invention proposes a coupling mechanism () for relatively movable elements () of a switchable cam follower () of a valve train of an internal combustion engine, a high lift being obtainable upon coupling of said elements () and a lift smaller than the high lift being obtainable upon uncoupling of said elements (), a first one () of said elements comprising a guide bore () for at least one coupling piston () which, for achieving coupling, can be displaced partly beyond a parting surface () between said elements () into an aligned reception () of a second one () of said elements, wherein upon cam lift and coupling of said elements (), a contact zone () between the piston () and the reception () is clearly spaced from an edge section () of the reception () on the parting surface (). This can be implemented in practice, for instance, through a special 'backwards' oriented flattened portion () on the piston (). Material loading on the edge section () is thus avoided.

Coupling mechanism

The invention proposes a finger lever () of a valve train of an internal combustion engine, said finger lever () being switchable to different valve lifts for at least one gas exchange valve and comprising an outer lever () having two arms () between which an inner lever () is arranged for pivoting relative to the outer lever (), which outer and inner levers () can be coupled to each other by a coupling means (), the outer lever () comprising on one closed end (), a support () for a gas exchange valve and the finger lever () comprising on an opposite end (), a complementary surface () for a support element, the inner lever () having a fulcrum () in a region of the opposite end (), and at least this inner lever () comprising a contact surface () for a cam. In the finger lever () of the invention, the outer lever () has a substantially open fork-like configuration, the contact surface () for the cam on the inner lever () is configured as a rotatable roller () and the coupling means () comprises at least one slide () that extends crosswise to a longitudinal direction of the finger lever (), an axial line of the at least one slide () coincides with an axial line of the roller (), and the fulcrum () of the inner lever () is situated at least approximately at a same point on a length of the finger lever () as a fulcrum of the outer lever () in a region of the complementary surface () of the finger lever (). The switchable finger lever () of the invention has only a small design space requirement and a coupling mechanism of a relatively simple structure.

Finger lever of a valve train of an internal combustion engine

A finger lever () of a valve train of an internal combustion engine, said finger lever () being switchable to different valve lifts for at least one gas exchange valve and comprising an outer lever () having two arms () between which an inner lever () is arranged for pivoting relative to the outer lever (), which outer and inner levers () can be coupled to each other by a coupling means (), the outer lever () comprising on one closed end (), a support () for a gas exchange valve and the finger lever () comprising on an opposite end (), a complementary surface () for a support element, the inner lever () having a fulcrum () in a region of the opposite end (), and at least this inner lever () comprising a contact surface () for a cam whereby in the finger lever (), the outer lever () has a substantially open fork-like configuration, the contact surface () for the cam on the inner lever () is configured as a rotatable roller () and the coupling means () comprises at least one slide () that extends crosswise to a longitudinal direction of the finger lever (), an axial line of the at least one slide () coincides with an axial line of the roller (), and the fulcrum () of the inner lever () is situated at least approximately at a same point on a length of the finger lever () as a fulcrum of the outer lever () in a region of the complementary surface () of the finger lever () so that the switchable finger lever () has only a small design space requirement and a coupling mechanism of a relatively simple structure.

What is proposed is a switchable tappet ( ) for the direct transmission of a cam lift to a tappet push rod. The tappet ( ) comprises a hydraulic clearance compensation element ( ) and has an excellent hydraulic rigidity compared to the prior art. This is achieved by a leak gap positioned radially very far outwards. This leak gap is situated directly between a housing ( ) and a pressure piston ( ) which, in its turn, encloses an inner element ( ) that acts on a tappet push rod.

Switchable tappet for the direct transmission of a cam lift to a tappet push rod

The invention proposes a switchable tappet ( ) for the direct transmission of a cam lift to a tappet push rod. A coiled compression spring ( ), used as a lost motion spring, for loading the inner element ( ) is shifted axially out of a housing ( ). For this purpose, the inner element ( ) comprises an extension ( ) that projects out of the housing ( ) and is surrounded by the coiled compression spring ( ). This measure contributes to minimizing the total mass of the switchable tappet ( ) because the overall length of the housing ( ) is shortened.

In a switchable support element ( ) for a valve train of an internal combustion engine, the lost motion spring ( ) of the valve train is made as a torsion spring. This spring is arranged outside of the support element ( ) and only the legs and the arms of the spring engage a housing and a head, respectively. In this way, the support element ( ) requires no substantially larger design space than non-switchable prior art elements, particularly in axial direction.

Switchable support element

A switchable support element ( ) requiring only a small design space. For this purpose, a slide ( ) that serves to couple an inner element ( ) to an outer housing ( ) in the support element ( ) is positioned laterally in a housing ( ) arranged in the cylinder head ( ). At the same time, a bore ( ) in the inner element ( ) for the slide ( ) is made as a pocket bore, the housing ( ) being seated through an annular extension ( ) directly in a bore ( ) of the outer housing ( ). The slide ( ) can be displaced electromagnetically or hydraulically in at least

A switchable, hydraulic support element ( ) requiring only a small design space is proposed. For achieving this, a bore ( ) for a slide ( ) is arranged laterally of a pressure piston ( ) of a hydraulic clearance compensation element ( ) in the inner element ( ) and is configured as a pocket bore. This dispenses with the stacked arrangement of the bore in the inner element and the clearance compensation element on top of each other as seen in prior art. At the same time, the slide ( ) is installed in a housing ( ) that extends in the cylinder head ( ).

A finger lever that is shaped without cutting having two side walls (,), which are connected in a first end area (,) by a lower wall (,) in a U-shape which opens upwardly, is provided with a bearing surface for a gas exchange valve (,) that is formed by the side walls (,) being adjacent to each other axially in the second end area (,) so that a separation plane (,) is formed in a longitudinal center plane (,) of the finger lever.

Finger lever shaped without cutting

A rocker arm (,) that can be uncoupled from the cam lift, the axle (,) of this rocker arm (,) is guided for longitudinal movement in a slot (,) of a pedestal (,), and the rocker arm (,) can be coupled to the pedestal (,) by locking elements (,) or it can be uncoupled from the pedestal (,) by these locking elements (,) for achieving a zero lift of an associated gas exchange valve (,).

Rocker arm installed in a cylinder head of a valve train of an internal combustion engine

A valve tappet actuated by a cam of an internal combustion engine comprises a cup (1) having a hollow cylindrical skirt (2) and a cup bottom (3) which closes the skirt (2) at one end. On an outer surface, the skirt (2) comprises a peripheral groove (4), and on an inner surface, at least one bead (5). Concentrically arranged within the cup (1) is an inner element (6) whose casing (9) bears against the bead (5, 21). A hydraulic valve clearance compensation element (10) is guided for axial displacement in the inner element (6). To simplify the manufacturing of this valve tappet, it is proposed that the cup (1) is hardened in a heat treatment process, and the inner element (5) is unhardened.

Growing community of inventors

Nuremberg, Germany

Dieter Schmidt