Titanium alloy valve lifter

Details Titanium alloy valve lifter Titanium alloy valve lifter

2006-03-29

2009-10-13

Eshete, Zelalem (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090480

Reexamination Certificate

active

07600499

ABSTRACT:
A lightweight and high-strength valve lifter is excellent in wear resistance and sliding properties. The valve lifter is made of a titanium alloy having a hardened layer on the top surface thereof, on which a cam is caused to slide. The hardened layer is composed of an α-case and an oxygen diffusion layer under the α-case. The α-case22is formed in a thickness of not less than 3 μm and not more than 15 μm. The oxygen diffusion layer has a thickness of not less than 10 μm. The hardened layer on the top surface of the valve lifter is formed by oxidation treatment in a furnace at a temperature of not less than 600° C. An outermost oxide layer21formed on the α-case as a result of the oxidation treatment is removed.

REFERENCES:
patent: 3408236 (1968-10-01), Van Hartesveldt
patent: 5304263 (1994-04-01), Champin et al.
patent: 6210807 (2001-04-01), Dong et al.
patent: 6237441 (2001-05-01), Nishioka et al.
patent: 6607693 (2003-08-01), Saito et al.
patent: 2004/0084117 (2004-05-01), Woodfield et al.
patent: 7-139314 (1995-05-01), None

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