Patent ID: 7779800

Claim:
In combination, a camshaft assembly comprising a tubular first shaft, a second shaft arranged concentrically within the first shaft and rotatable relative thereto, and cams mounted for rotation with the first and second shafts whereby relative rotation of the first and second shafts causes selected cams of the camshaft to rotate relative to other cams of the camshaft, and a phaser comprising a drive member and a driven member each connected for rotation with a respective one of the two shafts of the camshaft assembly, wherein a first of the drive and driven members comprises a disc with at least one arcuate cavity that is open at both axial ends, and a second of the drive and driven members comprises two closure plates sealing off the axial ends of each cavity of the first member, and wherein the phaser further comprises at least one vane which is movably received in a respective cavity to divide the cavity into two variable volume working chambers, the vane having two opposite axial ends secured to the two closure plates respectively.