Camshaft arrangement having angularly movable cams

A camshaft arrangement preferably, for an internal combustion engine comprising a camshaft, at least one cam mounted thereon for angular motion relative to the camshaft over a predetermined angular range and having a through-hole traversed by the camshaft, and coupling means defining the angular range of motion of the cam and comprising a roller rotatably supported with respect to the camshaft and a recess in the cam adjacent to the through-hole and accommodating the roller with peripheral play and arranged to receive a damping fluid, and a pair of spacer sleeves having faces abutting the angularly movable cam, the cam and the spacer sleeves being assembled on the camshaft by sliding motion from one end of the camshaft, a pair of stops on the camshaft for retaining the cam and spacer sleeves in position so that the faces of the spacer sleeves abutting the angularly movable cam substantially seal the recess in the cam while permitting angular motion of the cam and leaving predetermined gaps for the damping fluid, the abutting faces of the spacer sleeves having openings to receive and support the ends of the roller projecting beyond the cam.