Valve lifter surface and processing method thereof

Details Valve lifter surface and processing method thereof Valve lifter surface and processing method thereof

1996-07-08

1998-04-28

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9048, 74569, 2988843, F01L 116

Patent

active

057432244

ABSTRACT:
A valve lifter and processing method therefor include a valve lifter surface to be installed in a recess of a cylinder head of an internal combustion engine. The method includes a grinding step for beveling, or tapering, the circumferential end of a cylindrical wall portion of the valve lifter which slidingly contacts the recess. Excess material resulting from the beveling process is then removed for smoothing the beveled circumferential end. The smoothed surface is then coated with a hardening layer for abrasion protection and smoother operational movement. As a final step, the hardening layer may be polished for further enhancement of operating performance.

REFERENCES:
patent: 3545415 (1970-12-01), Mori
patent: 4829950 (1989-05-01), Kanamaru et al.
patent: 4867113 (1989-09-01), Pieprzak et al.
patent: 4873150 (1989-10-01), Doi et al.
patent: 4876996 (1989-10-01), Mayer et al.
patent: 4909198 (1990-03-01), Shiraya et al.
patent: 5289804 (1994-03-01), Mori

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