Gkn Driveline International Gmbh

Gkn Automotive Gmbh

Ulrich Brochheuser

Andreas Gehrke

Wolfgang Beigang

Orkan Eryilmaz

Horst Statezni

Hans Schreiber

An inner joint part of a tripod constant velocity joint comprises a hub having an axis of rotation. Three projections extend radially outwardly. There is an adjoining transition region and a bearing region. A spherical circumferential surface of each projection forms a first surface line extending in a first plane. A resulting inner sphere contacts opposite points of the first surface line extending at least in first angle ranges adjacent to a respective point outside the inner sphere. A second surface line in a second plane touches the inner sphere at touch points only at the height of the largest diameter of the projection and extends at least in second angle ranges adjacent to the respective touch point within the inner sphere. A roller element has a convex inner circumferential surface, an extension line forming a radius having a maximum magnitude in a central region, less in an adjacent region.

Inner joint part and roller element of a tripod constant velocity joint

A method for forming hollow profiles is disclosed. In one exemplary method, a hollow profile is guided through a die in a processing direction and fixed by a mandrel such that at the die, the hollow profile has a material flow velocity in this processing direction (), in which the method the mandrel has a drawing velocity in the processing direction that is greater than the material flow velocity.

Method for forming hollow profiles

A process of producing an inner profile ()in a tube or hollow profile () includes inserting the tube or hollow profile () into a supporting sleeve (), with a first tube end () being axially supported; placing a pressure-loaded annular dieon to the other tube end (); pressing a forming die () with an outer profile into the tube or hollow profile () from the latter tube end () for producing the inner profile (); allowing a return of the annular die () under a pressure load in the opposite direction of that of pressing in the forming die ().

Backward extrusion process for inner profiles

A method for manufacturing hollow shafts having end portions of greater wall thickness and at least one intermediate portion of reduced wall thickness, from a tube having constant wall thickness. The method includes providing a mandrel having diameters stepped over its length, with a first longitudinal section having a smallest diameter and at least one further longitudinal section having a further larger diameter. Reducing the external diameter of a first portion of the tube over the first longitudinal section of the mandrel to produce the first end portion. Reducing the external diameter of a middle portion of the tube over the at least one further longitudinal section of the mandrel to produce the at least one intermediate portion. Reducing the external diameter of a further portion of the tube over the first longitudinal section of the mandrel to produce the second end portion.

Reducing tubes over a stepped mandrel to manufacture tubular shafts having an undercut in one operation

A method of elongating a tube () by way of a drawing ring (), wherein, when elongating the tube (), tensile forces are applied to an elongated tube portion () which has already passed through the effective drawing ring cross-section and that pressure forces are applied to a tube blank portion () which has not yet passed through the effective drawing ring cross-section, wherein the tensile forces are applied by a mandrel () which is positioned in the tube and which is connected to a front tube end in a form-fitting or force-locking way.

Growing community of inventors

Neunkirchen, Germany

Ulrich Brochheuser