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Modular Camshaft Assembly



Modular Camshaft Assembly
Inventor: Jesel, Daniel H.; (Spring Lake, NJ)

Elongated shaft, at least one cam lobe assembly, at least one spacer assembly, and a cam adapter assembly. Each cam lobe assembly is selectively secured to the elongated shaft. Each spacer assembly is secured to the elongated shaft, wherein the spacer assembly is selectively positioned adjacent the cam lobe assembly. The cam adapter assembly is secured to the elongated shaft and adapted to connect the modular camshaft assembly to a drive assembly.

The modular camshaft assembly may further include an adjustable cam lobe fastener assembly. The cam lobe fastener assembly secures each cam lobe assembly to the elongated shaft to prevent rotation of each cam lobe assembly with respect to the elongated shaft. In accordance with the present invention, the adjustable cam lobe fastener assembly may include a cam lobe fastener for securing each cam lobe assembly to the elongated shaft, and an adjustment assembly for adjusting the position of the cam lobe fastener with respect to the elongated shaft. The cam lobe fastener assembly may include a fastener pin, which engages a recess in the cam lobe assembly. The adjustment assembly may include a plurality of recesses on the elongated shaft. Each recess is adapted to receive the fastener pin. It is contemplated that multiple recesses may be provided for each cam lobe assembly such that the timing of the valve opening may be adjusted by locating the pin in a different recess.

With the modular camshaft arrangement contemplated by the inventors, the overall metallurgy for the shaft and cam lobes may be optimized, not compromised like unitary camshafts. Different materials are used in the formation of the lobes 20 and shaft 10. The metallurgy for each lobe 20 is optimized for wear and interface with a follower of an actuation assembly for transferring the motion of the cam lobe to operate (i.e. open) a valve. It is contemplated that dedicated cam lobe assemblies 20 may be provided to operate intake and exhaust valves associated with each engine cylinder and spaced along the shaft 10. Furthermore, the metallurgy of the shaft 10 is optimized for strength and stiffness. With the modular camshaft arrangement contemplated by the inventors, the heat treatment is also optimized for the individual components rather than compromised for separate features of a one piece unit. As a result, the heat treatment of the lobes may be optimized and tailored to produce a cam lobe having excellent wear resistance. The heat treatment of the camshaft may be optimized and tailored to produce a cam shaft having high strength.

www.jesel.com

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