Ported engine cylinder liner with selectively laser-hardened...

Details Ported engine cylinder liner with selectively laser-hardened... Ported engine cylinder liner with selectively laser-hardened...

2007-01-16

2007-01-16

Compton, Eric (Department: 3726)

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

C148S565000, C148S567000, C219S121600

Reexamination Certificate

active

10787420

ABSTRACT:
Selective laser and induction hardening are applied to areas of a water jacketed engine cylinder liner to provide improved resistance to scuffing resulting from the rubbing contact of the walls and piston rings of an associated piston. An upper bore portion and port relief areas of the liner are fully induction hardened to improve wear resistance. The port area is then fully laser hardened to improve wear resistance. If desired, the laser hardening process may continue beyond the intake port area to the port relief areas to ensure full hardening of the port relief areas and continuous hardening between the intake ports and the port relief areas to improve wear resistance.

REFERENCES:
patent: 4017708 (1977-04-01), Engel et al.
patent: 4093842 (1978-06-01), Scott
patent: 4393821 (1983-07-01), Urano
patent: 60-251222 (1985-12-01), None
patent: 60-260769 (1985-12-01), None
patent: 61-060818 (1986-03-01), None
patent: 7004303 (1995-01-01), None

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