Patent ID: 6971353

Claim:
A camshaft adjustment control device ( 1 ) for an internal combustion engine arranged in the drive train for a camshaft ( 2 ) from a crankshaft and mounted coaxially onto the camshaft ( 2 ) for rotation therewith, said camshaft adjustment control device ( 1 ) comprising an inner body ( 10 ) connected to the camshaft ( 2 ) by a co-axial clamping bolt ( 9 ), an outer body ( 11 ) extending around the inner body and being rotatable relative to the inner body ( 10 ) and operatively connected to the crankshaft so as to be driven thereby, said inner and outer bodies ( 10 , 11 ) defining therebetween a control space to which, a hydraulic fluid can be supplied for adjusting the angular position of the inner and outer bodies ( 10 , 11 ) relative to each other, a control valve including a control spool ( 8 ) movably supported in a central bore in the clamping bolt ( 9 ) so as to form a multi-way valve for controlling the supply of fluid to, and its discharge from, the space between the Inner and outer bodies ( 10 , 11 ) to adjust their relative angular positions, and a check valve ( 30 ) arranged in a fluid supply passage( 50 , 50 ′, 53 , 53 ′) for the admission of the hydraulic fluid to the multi-way valve ( 3 ) and, respectively, the camshaft adjustment control device ( 1 ), said pressurized fluid supply passage ( 53 ) extending co-axially with the control spool valve ( 8 ) and the check valve ( 30 ) being arranged in the co-axially extending supply passage for supplying pressurized fluid to the control spool valve ( 8 ).