Patent ID: 6968818
Filing Date: 2005-11-29
Classification: F01L

Abstract:
1. A camshaft adjuster for an internal combustion engine, comprising: a drive wheel ( 11 ) including a housing drum with walls ( 15 ) extending radially inwardly from the housing drum ( 11 ) in circumferentially spaced relationship, so as to form annular spaces ( 18 , 19 ) therebetween, a vane wheel ( 12 ) rotatably supported in said housing drum ( 11 ) and having a cylindrical base body in sealing contact with the radially inwardly extending housing drum walls ( 15 ) and vanes ( 13 , 14 ) extending radially outwardly from the base body of said vane wheel ( 12 ) into said annular spaces ( 18 , 19 ) and having radially outer end faces in sealing contact with the inner circumferential wall ( 17 ) of said housing drum ( 11 ) and being of smaller circumferential width than the annular spaces so as to form at opposite sides of each vane ( 13 , 14 ) pressure chambers ( 18 , 19 ) to which pressurized fluid can be admitted in a controlled manner for adjusting the angular position of the vane wheel ( 12 ) relative to the drive wheel, a locking device consisting of a spring-loaded locking bolt ( 23 ) arranged in one of the housing drum ( 11 ) and the vane wheel ( 12 ) and a locking bore formed in the other of the housing drum ( 11 ) and the vane wheel ( 12 ) for receiving the locking bolt ( 23 ) and rotationally interlocking the housing drum ( 11 ) and the vane wheel ( 12 ), said locking bolt ( 23 ) being subjected during an engine startup phase to a hydraulic fluid pressure provided for controlling the vane wheel position until the locking bolt ( 23 ) is fully disengaged and means for transferring the pressure control for actuating the locking bolt ( 23 ) to a system pressure supply line ( 29 ) during operation of the engine after the startup phase thereof so that the locking bolt ( 23 ) remains safely disengaged during engine operation, said locking bolt ( 23 ) including hydraulic fluid pressure control passages for effecting the transfer of the pressure control for actuating the locking bolt ( 23 ) to said pressure supply line.