| 摘要 |
A device for the relative rotational angle adjustment of a cam shaft of a internal combustion engine to a drive wheel, with an interior part that is connected in a stationary manner with the cam shaft and is equipped with at least roughly radially running ribs or fins, and with a driven cellular wheel, which is equipped with several cells that are distributed across the circumference and limited by ribs. These cells are divided into two pressure chambers by the ribs or fins of the interior part, which are guided in an articulating manner, and the cam shaft is adjustable through the ribs or fins between two final positions relative to the cellular wheel when hydraulic pressure is applied and/or relieved through control lines. At least one locking device between the interior part and cellular wheel, which is equipped with a movable locking element that acts together with at least one counter-element in the respectively other component of the two components cellular wheel or interior part, causes the interior part to be able to be locked relative to the cellular wheel in at least one final position. The locking and/or unlocking process of the locking element occurs through at least one oil duct that leads to the locking element. Between two pressure chambers in or on the cellular wheel an opening connected with the oil duct is arranged, whose passage to the two pressure chambers is controlled in dependence on the adjusting position of the interior part. This way, the cam shaft adjusting unit can be locked safely.
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