Brake cylinder

1. A brake cylinder, comprising:

a compression spring;

a pressure chamber having a wall with an opening therein;

a dividing wall disposed between the compression spring and the pressure chamber;

a piston having an inner wall and a bottom, the piston being disposed in the pressure chamber and operable to extend through the opening in the wall of the pressure chamber; and

a nut disposed inside the piston and configured to be held on a release bolt,

wherein the piston includes a guide configured to guide the nut such that the nut cannot be rotated in the piston and such that the nut is moveable along a longitudinal direction of the piston,

wherein a support structure is disposed inside the piston and configured to abut against the nut while the release bolt is screwed into the nut,

wherein the piston comprises a first retaining structure and a second retaining structure, the first retaining structure configured to hold the support structure in an assembly position and the second retaining structure configured to hold the support structure in a drive position,

wherein, from the assembly position, the drive position is located in a direction of the bottom of the piston, and

wherein the support structure is moveable from the assembly position to the drive position by a movement of the nut relative to the piston.

2. The brake cylinder according to claim 1 , wherein the inner wall of the piston includes a first cavity,

wherein at least part of the support structure is configured to be held in the assembly position in the first cavity, and

wherein the first cavity is a circumferential groove or a group of grooves.

3. The brake cylinder according to claim 2 , wherein the cavity is provided with an oblique wall that abuts the support structure, and

wherein an obtuse angle is formed between the oblique wall and the inner wall of the piston.

4. The brake cylinder according to claim 2 , wherein each groove of the circumferential groove or group of grooves of the first cavity is defined by one or more crosswise walls that are crosswise to the inner wall of the piston and by one or more oblique walls that are disposed at an obtuse angle with respect to the inner wall of the piston.

5. The brake cylinder according to claim 4 , wherein the obtuse angle is from 100 degrees to 135 degrees.

6. The brake cylinder according to claim 4 , wherein the oblique walls are configured to allow the compression spring to slide out of each groove or group of grooves of the first cavity under pressure from one or more of the release bolt and the nut.

7. The brake cylinder according to claim 1 , wherein the inner wall of the piston includes a second cavity,

wherein at least part of the support structure is configured to be held in the drive position in the second cavity, and

wherein the second cavity is a circumferential groove or a group of grooves.

8. The brake cylinder according to claim 1 , wherein the drive position is at the bottom of the piston.

9. The brake cylinder according to claim 1 , wherein the support structure is elastic.

10. The brake cylinder according to claim 9 , wherein the support structure is compressible.

11. The brake cylinder according to claim 1 , wherein the support structure is plastically deformable.

12. The brake cylinder according to claim 1 , wherein the support structure is a helical spring, a compression spring, a conical spring, a disc, a spring disc, a ring, a snap ring, or a washer spring.

13. The brake cylinder according to claim 12 , wherein the support structure is located in a direction of the bottom of the piston relative to the nut.

14. The brake cylinder according to claim 13 , wherein the support structure is configured to abut against the nut while the release bolt is screwed into the nut by exerting a spring force on the nut in a direction opposite the bottom of the piston.

15. The brake cylinder according to claim 14 , wherein the bottom of the piston is located at an end of the piston farthest from the opening in the wall of the pressure chamber.

16. The brake cylinder according to claim 12 , wherein the support structure is a helical spring, a compression spring, a conical spring, a disc, a spring disc, a ring, a snap ring, or a washer spring.

17. A brake comprising:

a brake cylinder comprising:

a compression spring;

a pressure chamber having a wall with an opening therein;

a dividing wall disposed between the compression spring and the pressure chamber;

a piston having an inner wall and a bottom, the piston being disposed in the pressure chamber and operable to extend through the opening in the wall of the pressure chamber; and

a nut disposed inside the piston and configured to be held on a release bolt,

wherein the piston includes a guide configured to guide the nut such that the nut cannot be rotated in the piston and such that the nut is moveable along a longitudinal direction of the piston,

wherein a support structure is disposed inside the piston and configured to abut against the nut while the release bolt is screwed into the nut,

wherein the piston comprises a first retaining structure and a second retaining structure, the first retaining structure configured to hold the support structure in an assembly position and the second retaining structure configured to hold the support structure in a drive position,

wherein, from the assembly position, the drive position is located in a direction of the bottom of the piston, and

wherein the support structure is moveable from the assembly position to the drive position by a movement of the nut relative to the piston.