Patent ID: 8991567
Filing Date: 2015-03-31
Classification: B60T,F16D

Abstract:
1. A combination cylinder comprising: a service brake cylinder, as an active service brake, with at least one pressure-medium-actuated service brake piston which actuates a brake mechanism via a service brake piston rod; and a spring store brake cylinder, as a passive parking brake, with a spring store brake piston actuated by a pressure medium counter to an action of at least one store spring, with the spring store brake piston of the spring store brake cylinder transmitting the force of the at least one store spring to the service brake piston rod via a force-transmitting gearing assembly included in the spring store brake cylinder when in a parking braking situation, wherein the force-transmitting gearing assembly includes a first angle lever and a second angle lever, a thrust ring mounted so as to be rotationally fixed and configured to be actuated coaxially with respect to a central axis of the combination cylinder, wherein the thrust ring exerts axial forces on a spindle drive, wherein one part of the spindle drive is mounted in a rotationally fixed manner and the other part of the spindle drive is rotatably mounted coaxially with respect to the central axis, wherein rotational movement of the other part of the spindle drive is optionally blocked by a releasable rotational lock for axial force transmission between the rotationally fixed part and the rotatable part and optionally unblocked to eliminate the axial force transmission, wherein the rotational lock is arranged between the thrust ring and the rotatable part of the spindle drive, at least one bearing journal arranged perpendicular to the central axis of the combination cylinder and formed on the thrust ring, wherein the bearing journal is pivotably mounted to the at least one angle lever assembly of the force-transmitting gearing assembly connected at one end to the spring store brake piston and connected at the other end to a fixed support surface of the combination cylinder such that, during an actuation of the spring store brake piston in the parking braking situation, a rotation of the at least one angle lever assembly about the bearing journal, and, therefore, an actuation of the thrust ring in the same direction, is triggered, wherein the first angle lever and the second angle lever are symmetric in relation to the central axis, and are provided on the thrust ring such that a first torque generated by the first angle lever about an axis perpendicular to the central axis is compensated by a second torque generated by the second angle lever, and such that the movements of the spring store brake piston and the service brake piston rod are coaxial and a force transmission ratio becomes greater with progressive stroke of the spring store brake piston.