Brake cylinder with parking brake function
AssigneeWABCO GmbH
InventorFrank Schrader
Life of this patent
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Abstract
A brake cylinder having a parking brake function includes a cylinder housing, a piston, and a piston tube for actuating a brake. A threaded bolt protruding into the piston tube and fixed to the cylinder housing by its upper end is used to effect the parking brake function. A clamping nut displaceable by means of a forked, axially rotatable driving element extends over the threaded bolt. The driving element is rotated with the clamping nut while the cylinder is subjected to pressure by the parking brake until the clamping nut is supported against the piston in the parking position of the piston. The piston is mechanically locked when the cylinder housing is not subjected to pressure.
Claims12
A brake cylinder, comprising:
- a cylinder housing;
- a piston, said piston including a piston tube for actuation of a brake, said piston tube having an open end;
- a rotatable threaded bolt extending into said open end of said piston tube;
- a non-rotatable clamping nut that travels along said rotatable threaded bolt during rotary movement of said bolt and, at a lowermost position, bears against said piston proximate said open end of said piston tube to actuate said brake;
- a fixed guide rod, said clamping nut encircling each of said bolt and said guide rod such that each of said bolt and said guide rod passes through the clamping nut and contacts different portions of an inner surface of said clamping nut, said clamping nut remaining in contact with each of said bolt and said guide rod when said clamping nut travels along said bolt;
- and a drive for effecting said rotary movement of said rotatable threaded bolt.
Dependencies are inferred from the claim text.