DEVICE FOR ALTERING THE OPENING AND CLOSING TIMES OF GAS-EXCHANGE VALVES OF AN INTERNAL-COMBUSTION ENGINE

摘要

A device (1) for altering the opening and closing times of gas-exchange valves of an internal-combustion engine has communicating slide and freewheel means (15, 20). By means of these elements, immediately upon starting the internal-combustion engine, an adjusting piston (7) of the device (1) is brought into its desired starting position and/or held there long enough for the device (1) to be filled sufficiently with hydraulic fluid again. While in the hydraulic-fluid-free state, the adjusting piston (7) is at the same time largely prevented from making any undesired oscillations.