Patent ID: 8413621

Claim:
A hydraulic assembly for a cylinder head of an internal combustion engine having a hydraulically variable gas exchange valve train, comprising: a hydraulic housing comprising at least one driving side master unit, at least one driven side slave unit and at least one actuable hydraulic valve, at least one medium pressure chamber extending in the hydraulic housing, at least one high pressure chamber extending in the hydraulic housing and arranged in a transmitting direction between the associated master unit and the associated slave unit while being able to be connected through the associated hydraulic valve to the associated medium pressure chamber, at least one low pressure chamber extending in the hydraulic housing and serving as a hydraulic medium reservoir while being connected through a throttling point to the associated medium pressure chamber, a valve body which is displacably received in a direction of a hydraulic medium flow between the medium pressure chamber and the low pressure chamber in the hydraulic housing and serves to form the throttling point, the throttling point comprises first and second flow cross-sections of different sizes for the hydraulic medium flow as a function of the position of the valve body, and the first flow cross-section available for the hydraulic medium flow out of the medium pressure chamber into the low pressure chamber is larger than the second flow cross-section available for the hydraulic medium flow out of the low pressure chamber into the medium pressure chamber.