Patent ID: 8006660
Filing Date: 2011-08-30
Classification: F01L

Abstract:
1. Device for variably adjusting the control times of gas-exchange valves of an internal combustion engine comprising: an external rotor and an internal rotor arranged such that it can rotate relative to the external rotor, wherein one of the internal rotor or the external rotor is drivingly connected to a crankshaft and the other of the internal rotor or the external rotor is drivingly connected to a camshaft, wherein at least one pressure space is provided and each of the pressure spaces is divided into two pressure chambers acting against each other, wherein one of the pressure chambers of each of the pressure spaces acts as an advancing chamber and the other pressure chamber acts as a retarding chamber, wherein by supplying pressure medium to the advancing chamber, while simultaneously withdrawing pressure medium from the retarding chamber, the rotor interacting with the camshaft is rotated relative to the rotor interacting with the crankshaft in a direction of a maximum advanced position, wherein by supplying pressure medium to the retarding chamber, while simultaneously withdrawing pressure medium from the advancing chamber, the rotor interacting with the camshaft is rotated relative to the rotor interacting with the crankshaft in a direction of a maximum retarded position, wherein at least one first pressure medium channel and one second pressure medium channel are provided by which pressure medium is fed to the pressure chambers or can be withdrawn from the pressure chambers, wherein at least two rotational angle limiting devices are provided, wherein each of the rotational angle limiting devices can assume an unlocked state and a locking state, wherein the locking state can be set by supplying pressure medium to or withdrawing pressure medium from the respective rotational angle limiting devices the locking state of the first rotational angle limiting device is controlled exclusively by a pressure prevailing in at least one of the pressure chambers, and the locking state of the second rotational angle limiting device is controlled by a separate control line, wherein the separate control line communicates neither with the pressure medium channels nor with the pressure chambers.