Patent ID: 9200546
Filing Date: 2015-12-01
Classification: F01L

Abstract:
1. A device for adjusting the rotational angular position of a cam shaft relative to a crankshaft of a combustion engine, said device comprising: (a) a stator which can be rotary-driven by the crankshaft in a fixed rotational speed relationship; (b) a rotor which can be rotary-driven by the stator and can be coupled to the cam shaft in order to rotary-drive the cam shaft; (c) an early setting chamber for generating a first torque which acts on the rotor relative to the stator in a leading direction, and a late setting chamber for generating a second torque which acts on the rotor relative to the stator in a trailing direction, wherein in order to generate the first torque or the second torque, the early setting chamber and the late setting chamber can be charged with a pressure fluid, wherein when a rotational speed of the crankshaft rises, a pressure of the pressure fluid likewise rises, in order to be able to adjust the rotational angular position of the rotor relative to the stator; (d) a supply branch for supplying the pressure fluid to the setting chambers and a drainage branch for draining the pressure fluid from the setting chambers; (e) and a pressure storage means which is arranged in the supply branch and comprises a spring means and a storage chamber which can be filled with the pressure fluid against a restoring spring force of the spring means, wherein the spring means is formed by at least one spring member which is a mechanical spring; (f) wherein the storage chamber begins to fill, against the spring force, at a start-of-filling pressure which is at most as large as a hot idling pressure which the pressure fluid exhibits when the combustion engine is idling in its hot operational state, (g) and wherein filling of the storage chamber is completed only if the pressure of the pressure fluid exceeds the hot idling pressure, wherein the pressure storage chamber is able to resupply the pressure fluid at a pressure above the hot idling pressure.