Patent ID: 8925698
Filing Date: 2015-01-06
Classification: B60T,F16D,F16J

Abstract:
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.