| 摘要 |
The invention concerns a device (1) for varying the valve timing of gas exchange valves of an internal combustion engines, and the invention more particularly concerns a hydraulic camshaft adjusting device of a rotary piston type comprising a drive pinion (5) connected in driving relationship to a crankshaft, and a winged wheel (6) connected rotationally fast to a camshaft (4). The drive pinion (5) comprises a hollow space (10) defined by a circumferential wall (7) and two side walls (8, 9), a plurality of hydraulic working chambers being formed in the hollow space (10) by a plurality of limiting walls. The winged wheel (6) comprises a plurality of radial wings (14) that extend individually into the hydraulic working chambers (12) and divide these into first and second hydraulic pressure chambers (15, 16) which, when pressurized by a hydraulic pressure medium, effect a pivoting or a fixing of the winged wheel (6) relative to the drive pinion (6). The supply and discharge of the hydraulic pressure medium to and from the pressure chambers (15, 16) of the device (1) of the invention is effected through radial grooves (17, 18) that are made in the side walls (8, 9) of the drive pinion (5) and open with their one ends (19) into the pressure chambers (15, 16).
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