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AssigneesDr. Ing. h.c.F. Porsche Aktiengesellschaft, Hydraulik-Ring GmbH
InventorsEdwin Palesch, Martin Maier, Gordon Neudoerfer
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The invention relates to a system for the relative angle-of-rotation adjustment of a camshaft of an internal-combustion engine with respect to a driving wheel, having an adjusting unit (6) which has an interior part (4) non-rotatably connected with the camshaft (2), the adjusting unit (6) having a cell wheel (12) which encloses the interior part (4) and which has several cells distributed along the circumference and bounded by webs (14a to 14c), which cells are divided by webs or blades (8a to 8c) of the interior part (4) angularly movably guided therein into two pressure spaces (22a to 22c and 24a to 24c) respectively, during whose hydraulic pressure admission or pressure relief, the camshaft can be rotated by way of the webs or blades (8a to 8c) between two end positions relative to the cell wheel (12) and that a movable locking element (66) interacts with at least one counterelement in the respective other one of the two components—cell wheel (12) or interior part (4)—, that the locking element (66) is arranged in a hydraulic line (80, 82) leading to a pressure space (22a) and, only in an unlocked position, opens up the hydraulic line (80, 82) to the pressure space (22a), and that bores (42a to 42c) leading to the pressure spaces (22a to 22c) are arranged in the interior part (4), the openings of the bores (42a to 42c) in the locked end position of the adjusting unit (6) being closed off by the webs (14a to 14c) of the cell wheel (12). It is suggested that the locking element (66) can be changed into a first unlocking position, in which the bore (82) in the web (8a) controlled by the locking element (66) as well as the bores (42a to 42c) in the interior part (4) leading to the pressure spaces (22a to 22c) are still closed, and that the locking element (66) can be changed into a second unlocking position in which first the bore (82) leading to the pressure space (22a) is opened up by the locking element (66) and, after an initial adjusting path (α) of the interior part (4), also the bores (42a to 42c) leading to the pressure spaces (22a to 22c) are opened up. As a result, the useful life and the functionality of the locking device is considerably improved.
System for relative angle-of-rotation adjustment of a camshaft of an internal-combustion engine with respect to a driving wheel, having an adjusting unit (6) which has an interior part (4) non-rotatably connected with the camshaft (2), the adjusting unit (6) having a cell wheel (12) which encloses the interior part (4) and which has several cells distributed along the circumference and bounded by webs (14a to 14c), which cells are divided by webs or blades (8a to 8c) of the interior part (4) angularly movably guided therein into two pressure spaces (22a to 22c and 24a to 24c) respectively, during whose hydraulic pressure admission or pressure relief, the camshaft can be rotated by way of the webs or blades (8a to 8c) between two end positions relative to the cell wheel (12) and that a movable locking element (66) interacts with at least one counterelement in the respective other one of the two components—cell wheel (12) or interior part (4)—, that the locking element (66) is arranged in a hydraulic line (80, 82) leading to a pressure space (22a) and, only in an unlocked position, opens up the hydraulic line (80, 82) to the pressure space (22a), and that bores (42a to 42c) leading to the pressure spaces (22a to 22c) are arranged in the interior part (4), the openings of the bores (42a to 42c) in the locked end position of the adjusting unit (6) being closed off by the webs (14a to 14c) of the cell wheel (12), characterized in that the locking element (66) can be changed into a first unlocking position, in which the bore (82) in the web (8a) controlled by the locking element (66) as well as the bores (42a to 42c) in the interior part (4) leading to the pressure spaces (22a to 22c) are still closed, and in that the locking element (66) can be changed into a second unlocking position in which first the bore (82) leading to the pressure space (22a) is opened up by the locking element (66) and, after an initial adjusting path (α) of the interior part (4), also the bores (42a to 42c) leading to the pressure spaces (22a to 22c) are opened up.
Dependencies are inferred from the claim text.