Patent ID: 8776960

Claim:
A pneumatic brake cylinder comprising: a piston configured to transmit pneumatic pressure to a brake, a device configured to automatically adjust for wear of brake linings, the device including a spindle, an adjusting nut and a control sleeve which is configured to be engaged with the adjusting nut, wherein the control sleeve is configured as a composite part which has a metallic coupling ring and a sliding sleeve made from plastic, wherein the sliding sleeve and the coupling ring are fixedly connected and the coupling ring is provided with apertures filled with plastic in a region connected to the sliding sleeve, wherein a longitudinal extent of slots provided in spaced relation to the control sleeve are dimensioned in such a way that the slots act as a stop for the control sleeve and restrict a sliding movement of the control sleeve, wherein a permitted sliding section of the control sleeve corresponds to a spacing of the brake linings from a brake disk plus an elastic deformation of parts which transmit the braking force between the brake cylinder and the brake linings wherein the coupling ring has a toothing system for a positively locking engagement into a toothing system of the adjusting nut, wherein the toothing system of the coupling ring is attached on a free end side of the coupling ring and is configured as an oblique internal toothing system, and wherein the adjusting nut has an oblique external toothing system on one end side, and wherein positions of the oblique internal toothing system and oblique external toothing system provide a centering action so that the oblique internal toothing system of the control sleeve and the oblique external toothing system of the adjusting nut are in engagement with one another over their full surface area.