Device for relative rotational angle adjustment of a cam shaft of an internal combustion engine to a drive wheel

A method of making a relative rotational angle adjuster of a cam shaft of an engine to a drive wheel, comprising:

• connecting an interior part having at least approximately radial ribs to the cam shaft in a stationary manner;
• providing a driven cellular wheel having a plurality of cells distributed circumferentially and limited by second ribs;
• dividing each of the cells into two pressure chambers by the ribs of the interior part which are guided in an articulating manner so that the cam shaft is adjustable via the ribs of the interior part between two final positions relative to the cellular wheel when hydraulic pressure is applied or relived through control lines;
• providing between the interior part and the cellular wheel at least one locking device having a movable locking element which acts with at least one counter-element in one of the cellular wheel or the interior part to operatively cause the interior part to be locked relative to the cellular wheel in at least one of the final positions;
• providing at least one oil duct leading to the locking element to operatively provide locking or unlocking of the locking element;
• and
• connecting the oil duct to an opening in or on the cellular wheel between the two respective pressure chambers whereby a passage to the two respective pressure chambers is operatively controlled depending on an adjusting position of the interior part.

A driven cellular wheel assembly for the relative rotational angle adjustment of a cam shaft of an engine to a drive wheel, comprising:

• a driven cellular wheel having a plurality of cells arranged around a circumference;
• approximately radial ribs limiting the cells;
• articulatingly guided ribs dividing each respective cell into two respective pressure chambers which operatively adjust the cam shaft relative to the cellular wheel via hydraulic pressure;
• at least one locking device having a movable locking element which acts with at least one counter-element to lock the guided ribs relative to the cellular wheel in at least one position;
• at least one oil duct leading to the locking element to operatively lock or unlock the locking element;
• and
• an opening being arranged in or on the cellular wheel between two of the respective pressure chambers and connected to the oil duct whereby a passage is operatively formed between one of the respective pressure chambers and the oil duct depending on an adjusting position of the respective guided rib.