Patent ID: 9267397
Filing Date: 2016-02-23
CPC Classification: F01L

Claim Text:
1. A subassembly of a hydraulic variable valve train for an internal combustion engine, the subassembly comprising: a guide bushing that can be installed in a hydraulic housing; a piston supported in the guide bushing so as to be axially movable for actuating a gas exchange valve and being secured in a captive manner in the guide bushing; and a valve element that is located in a fixed position on an end section of the guide bushing distant from the gas exchange valve and that, together with an end face of the piston distant from the gas exchange valve, defines a hydraulic pressure chamber in the guide bushing, the valve element providing a throttle check valve that (i) allows a hydraulic medium to flow out of the pressure chamber throttled by a continuously open throttle opening and (ii) allows the hydraulic medium to flow into the pressure chamber with little throttling by a ball check valve, wherein the valve element has a valve housing through which the throttle opening passes and which provides a valve seat for the ball check valve, the valve housing being placed in the end section of the guide bushing distant from the gas exchange valve, and wherein the guide bushing and the valve element are fastened to one another, and the end section of the guide bushing distant from the gas exchange valve has a cylindrical counterbore in which the valve housing is fastened by a press fit and is axially supported on an axial shoulder formed by the counterbore, wherein the subassembly is provided as a modular unit assembled separately from the hydraulic housing.