Automotive brake cylinder comprising a sealing system which tolerates tilts of a rigid brake piston

摘要

A brake cylinder includes a pressure medium actuated brake piston delimiting a brake chamber and connected to a brake piston rod. The brake piston, together with the piston rod, swivels into positions tilted from a center axis of the brake cylinder during an actuation stroke. The brake piston is rigid and has a guide surface in the shape of a spherical surface of an imaginary sphere on its radially outer peripheral surface. The guide surface is guided along a radially inner cylinder wall of the brake cylinder with the center of the sphere lying on the center axis of the brake cylinder. The brake piston further has at least one elastic sealing element radially displaceable in a radially outer annular groove of the brake piston and delimiting an annular space together with a groove base of the annular groove on its side facing away from the radially inner cylinder wall. The annular space is fluidically coupled to the brake chamber such that contact pressure of the outer diameter of the sealing element against the radially inner cylinder wall of the brake cylinder depends on the pressure in the brake chamber.

主权项

1. An automotive brake cylinder, comprising:
a pressure medium actuated brake piston guided in the brake cylinder, the brake piston delimiting a brake chamber and being connected to a brake piston rod which, in use, acts on a brake application device; a pressure medium connection for supplying pressure medium to and/or removing pressure medium from the brake chamber; wherein the brake piston has a rigid design and comprises a rigid guide surface on a radially outer circumferential surface of the brake piston, the guide surface being guided along a radial inner cylinder wall of the brake cylinder; wherein the guide surface is in a form of a spherical segment of an imaginary sphere, a center point of the imaginary sphere lying on a center axis of the brake cylinder, wherein the brake piston rod together with the brake piston is pivotable into positions tilted from the center axis of the brake cylinder during an actuation stroke; wherein the brake piston further comprises at least one elastic sealing element movable radially in a radially outer annular groove of the brake piston on a side thereof facing away from the radially inner cylinder wall of the brake cylinder; wherein the elastic sealing element delimits, together with a groove base of the annular groove, an annular space fluidically coupled to the brake chamber such that contact pressure of an outer diameter of the elastic sealing element against the radially inner cylinder wall of the brake cylinder depends on a pressure prevailing in the brake chamber; and wherein the guide surface in the form of the spherical segment is symmetrical with respect to a center plane thereof, the center plane being arranged perpendicular to the center axis and having the center point of the imaginary sphere lying in the center plane.