Sona Blw Prazisionsschmiede Gmbh

Ksm Castings Gmbh

Peter Gutmann

Jin Hong Li

Frank Zerling

Lars Würker

The invention relates to a differential of lightweight construction for motor vehicles having a differential housing made of two sheet metal shells, in which differential bevel gears are supported on carrier studs fixed to the housing and mesh with axle bevel gears, and wherein a carrier shell having a drive gear attached to the exterior circumference thereof and a cover shell are joined along a common joining plane to form the differential housing, one or more carrier each having at least one end mounted in and attached to holes in the housing, which are each formed half in the carrier shell and the cover shell. Both sheet metal shells are encompassed by one or more circumferential rings adjacent to the connecting plane thereof for reinforcement.

Differential of lightweight construction for motor vehicles

In the toothing system () of a gearwheel having a plurality of teeth () whose tooth flanks () have involute form above a tooth-root region () of the tooth flanks (), the tooth-root region () of the tooth flanks () that, as viewed in normal section, extends between a root useful point () and a root point (F) has elliptical shape, tangentially adjoins the involute region of the tooth flank () at the root useful point () and tangentially contacts the root circle (FKS) at the root point (F). In its tooth-root region (), the tooth flank (), as viewed in normal section, substantially follows a partial section (B) of an ellipse (; E) whose semiaxes (a, b) have different lengths, one semiaxis (a, b) of the ellipse (; E) being inclined at an ellipse tilting angle alpha larger than 0&#xb0; and smaller than 90&#xb0; relative to a radial (R) through the root point (F). Furthermore, the tooth flanks () of the teeth () of the toothing are symmetric to one another across a symmetry plane (A) that divides the respective tooth () in axial direction.

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Munich, Germany

Peter Gutmann