Thyssen Krupp Ag

Thyssenkrupp Presta Ag

Reinhard Bader

Ralf Eckstein

Markus Mages

Hubert Heck

René Feuerstein

Roland Musweiler

Juergen Dohmann

Jürgen Dohmann

A rack for a steering gear of a motor vehicle may include a toothed portion having a toothing, and a shaft portion. Separate segments comprising at least one in each case bar-shaped toothed segment and one shaft segment are provided, are aligned on a common longitudinal axis, and are connected to one another at a joint. The method may involve providing a raw material piece having a piece length that is a multiple of a segment length, thermally continuously hardening the raw material piece across a multiple of a segment length to produce a hardened semi-finished segment product, cutting to length a hardened segment from the hardened semi-finished segment product, providing a further segment, and joining the hardened segment to a further segment.

Toothed rack and method for producing a toothed rack for a steering gear of a motor vehicle

A rack for a steering gear includes a toothed portion with a toothing extending along a longitudinal axis, and a generally cylinder-segment-shaped back opposite the toothing and having a back radius. A method for producing such a rack includes forming a cylindrical blank with an unmachined radius between a toothed die part having a toothed mold clearance and a back die part having a back mold clearance in a die cavity. The die may have a generally cylinder-segment-shape. In an open position of the die, the blank may be inserted between the toothed mold clearance and the back mold clearance. The toothed die part and the back die part in a forging stroke for closing the cavity may then be moved in a closing direction to a closed position. The back radius of the back mold clearance may be larger than the unmachined radius of the blank.

Rack and a method for producing a rack for a steering gear of a motor vehicle

A method can be employed to produce a rack for a steering gear. The rack may include a toothed portion with a toothing, and a shaft portion with a functional portion. Separate segments comprising at least one in each case bar-shaped toothed segment and one shaft segment may be provided, which are aligned on a common longitudinal axis and are connected to one another at a joint. The method may involve providing a shaft raw material piece having a length that is a multiple of a shaft segment length, continuously grinding a part of a circumferential face of the shaft raw material piece across a multiple of the shaft segment length to produce a semi-finished shaft segment product, cutting to length a shaft segment from the semi-finished shaft segment product, providing a toothed segment, and joining the shaft segment to the toothed segment.

Gear rack and method for producing a gear rack for a steering gear of a motor vehicle

A rack may include a toothed portion having a toothing, and a shaft portion having a threaded portion with a coaxial thread that has a thread length in an axial direction of a longitudinal axis. Separate segments comprising at least one in each case bar-shaped toothed segment and one shaft segment are provided, are aligned on the longitudinal axis, and are connected to one another at a joint. A method for producing the rack may involve providing a shaft raw material piece having a piece length that is a multiple of a shaft segment length, generating a thread that is continuous in a longitudinal direction on the shaft raw material piece across a multiple of the thread length to produce a threaded semi-finished product, cutting to length a threaded segment from the threaded semi-finished product, providing a toothed segment, and joining the threaded segment to the toothed segment.

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Satteins, Austria

Reinhard Bader