Patent ID: 7503293

Claim:
An adjustable camshaft ( 1 ), for internal combustion engines of motor vehicles, in which two shafts ( 2 , 4 ), namely an inside shaft ( 4 ) and an outside shaft ( 2 ) that are each fixedly connected to cams ( 5 , 6 ) are rotatable in relation to one another, the cams ( 6 ) belonging to the inside shaft ( 4 ) are each fixedly connected to the inside shaft ( 4 ) by pinning ( 7 ), to produce this relative movement, a hydraulic adjusting mechanism ( 3 ) is provided on one of the ends, a first and a second rotatable adjusting element ( 8 , 9 ) each being fixedly connected to one of the two shafts ( 4 , 2 ) opposite one another, the outside shaft ( 2 ) is adjacent to the adjusting mechanism ( 3 ) and is fixedly connected to a first bearing ring ( 11 ) that supports at least the outside shaft ( 2 ) in a stationary first abutment ( 10 ), comprising the features the first bearing ring ( 11 ) having two hydraulic channels ( 12 , 12 ′) which communicate at one end with hydraulic channels in the stationary first abutment ( 10 ) and at the other end with the second adjusting element ( 9 ), a stationary second abutment ( 13 ) is provided with a second bearing ring ( 14 ) axially at a first location or a subsequent location adjacent to the first abutment ( 10 ), said second bearing ring having two hydraulic channels ( 12 ″, 12 ′″), each communicating at one end with hydraulic channels in the second abutment ( 13 ) and at the other end with the first adjusting element ( 8 ) via hydraulic channels running in/on the inside shaft ( 4 ).