Piston for a hydraulic brake and method for production thereof

Piston for a hydraulic brake, configured as a bowl, open on one side, with a longitudinal axis, a wall and a bottom, wherein the bottom has an essentially plane outside surface, a wall thickness (S_b) of the bottom is thicker than a minimum wall thickness (S_w) of the wall, and at a transition area between bottom and wall, a wall thickness (S_ü) of the wall is continuously increasing towards the bottom so that the wall with a slope passes over into the bottom, a rounded portion is provided between the slope and the bottom and the rounded portion is designed partly as a recess in the material of the bottom so that the wall thickness (S_b) of the bottom is reduced at this point.

A method for manufacturing a piston for a hydraulic brake, comprising the steps:

• forming a base material into a bowl-type hollow cylinder with a longitudinal axis, with one frontal end of the hollow cylinder being closed by a convexly curved bottom,
• upsetting the hollow cylinder in its longitudinal axis in one or more forming steps so that the convexly curved bottom is rendered plane and the bottom material is thickened by the upsetting operation, with the result that the wall thickness (S_b) of the ready-made bottom increases by more than 1.1 times in relation to the base material.