Patent ID: 7234427
Filing Date: 2007-06-26
Classification: F01L

Abstract:
1. A locking device for a camshaft adjuster, comprising an annular drive part ( 11 ) having spaced projections ( 15 , 16 ) extending radially inwardly, a vane rotor ( 12 ) rotationally locked to a camshaft and being rotatably supported in the annular drive part ( 11 ), the vane rotor ( 12 ) having circumferentially spaced rotor vanes ( 13 , 14 ) extending radially out-wardly between the spaced projections ( 15 , 16 ) of the annular drive part ( 11 ) so as to form operating chambers ( 18 , 19 ) at the opposite side of each rotor vane ( 13 , 14 ), means for supplying hydraulic fluid to the operating chambers ( 18 , 19 ) for controlling the angular position of the vane rotor ( 12 ) relative to the drive part ( 11 ) depending on the pressure ratio in the operating chambers ( 18 , 19 ), and the locking device including at least two hydraulically releasable locking bolts ( 23 , 31 ) axially movably supported in a bore of one of the annular drive part ( 11 ) and the vane rotor ( 12 ) and biased toward the other of the annular drive part ( 11 ) and the vane rotor ( 12 ), the other including dent recesses for receiving the locking bolts for interlocking the drive part ( 11 ) and the vane rotor ( 12 ), the locking bolt ( 23 , 31 ) being arranged hydraulically upstream of the operating chambers ( 18 , 19 ) so as to permit the inflow of hydraulic fluid into the pressure chambers when the locking bolt ( 23 , 31 , 32 , 33 ) is in a release position, but blocking the hydraulic fluid flow in its locking position at least one of the detent recesses ( 37 to 41 ) being elongated in a circumferential direction, such that the at least one recess, with the associated locking bolt ( 31 ) engaged therein, limits relative movement between the vane rotor ( 12 ) and the drive part ( 11 ) thereby facilitating subsequent engagement of the other locking bolt ( 23 ) in the other engagement recess ( 24 , 31 , 32 , 33 ).