Camshaft for reciprocating piston engines

A camshaft for reciprocal piston engines comprising:

• a rotatable tube having an axis and an annular wall;
• axially spaced members including axially spaced cams and bearing rings mounted about the tube, the rotatable tube, cams, and bearings having the same axis;
• the rotatable tube having a plurality of circumferentially spaced projections extending axially through and from one longitudinally outermost member to and through the other longitudinally outermost member, said circumferentially spaced projections being spaced apart from each other, the projections being formed by expanding circumferentially spaced portions of the wall of the tube away from the axis of the tube, each cam and each bearing ring having circumferentially spaced axially extending grooves on their inner surfaces, said circumferentially spaced grooves being spaced apart from each other, each projection of the tube extending into a groove of each cam and a groove of each bearing ring to permanently secure the cams and bearing rings on the tube.