Manufacture of camshafts

Details Manufacture of camshafts Manufacture of camshafts

B - Operations, Transporting

23

P

26/187

B23P 15/00 (2006.01) B23P 11/02 (2006.01) B23P 25/00 (2006.01) F01L 1/047 (2006.01) F16H 53/02 (2006.01)

Patent

CA 1238773

ABSTRACT OF THE DISCLOSURE A camshaft is prepared from separately formed cams and a shaft. The cams may for example be formed by sintering. The cams are provided with holes which are under-sized and are provided with serrations. They are located on a correspondingly shaped dummy shaft in their required relative orientations and angular positions. Next, the cams are clamped in these positions and the dummy shaft removed. The cams are then heated to red heat and the serrated holes in them broached to bring them to their final size and to concentricity. Finally, a shaft having an exterior profile corresponding to the shape and size of the broached profile of the holes, at ambient temperature, is introduced into the holes and the cams are then cooled so that they shrink fit on to the shaft so ensuring that they are accurately positioned on the shaft. The cams are then released from the jig to give a finished camshaft.

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