Method of manufacturing assembly-type camshaft
OwnerHiroshi Hamadainventor
Life of this patent
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Abstract
This invention relates to camshafts of the assembly type and the manufacture thereof, in which a shaft part and cam parts are first formed separately, as individual parts of simple configuration. The cam parts are then freely mounted on the shaft part, then indexed to the desired axial and angular positions, and temporarily secured to the shaft by a fastening medium applied through an indexing hole through each cam and engaging the shaft, and thereafter the cams, so mounted and indexed, are permanently secured to the shaft by welding. The indexing hole also can function as a lubricant reservoir.
Claims11
A method of manufacturing a camshaft, comprising the steps of
- a. providing a plurality of parts including cam parts, journal parts and at least one gear part, said parts having shaft-receiving apertures therein;
- b. placing said parts at positions with their shaft-receiving apertures being aligned along a given axis, said parts while in said positions being in the sequence and at the longitudinal spacing desired in the completed camshaft, said journal parts and said gear parts being expanded by heating to enable them to receive a shaft;
- c. moving a shaft longitudinally along said given axis into the apertures of said parts while maintaining the parts in said given spaced relationship;
- d. cooling the journal parts and the gear parts to secure them to the shaft by an interference fit;
- e. holding the cam parts while rotating the shaft to a position where one said cam part is at a desired angular indexed position with respect to the shaft, and temporarily attaching said one said cam part to the shaft while at said desired angular position;
- f. performing step (e) for each of the remaining said cam parts, and,
- g. permanently attaching said cam parts to the shaft by fillet welding both ends of each said cam part to the shaft to form a built-up camshaft.
Dependencies are inferred from the claim text.