Patent ID: 9062574
Filing Date: 2015-06-23
Classification: F01L

Abstract:
1. A device for actuating outlet valves of a valve-controlled internal combustion engine for motor vehicles, the device being part of a valve drive between a cam of a driving camshaft and the outlet valves, the device comprising: a valve bridge for acting on the outlet valves; a fixed counter bracket; a first hydraulically charged piston-cylinder unit having a piston and a pressure chamber, disposed on the valve bridge in a force flow between the cam of the driving camshaft and one of the outlet valves, and configured so that when the one of the outlet valves opens under action of exhaust-gas counter pressure, play compensation in the valve drive can be produced to hold the one of the outlet valves open; a second piston-cylinder unit having a piston and a pressure chamber arranged on the valve bridge coaxial with the first piston-cylinder unit, the second piston-cylinder unit interacts with the fixed counter bracket to control a discharge duct out of the pressure chambers of the first piston-cylinder unit and the second piston-cylinder unit; and a spring acting on the pistons of the first piston-cylinder unit and the second piston-cylinder unit without being supported in the valve bridge, the spring preloading the piston of the first piston-cylinder unit in a readjustment direction.