Automotive engine valve mechanism system shim and lifter of...

Details Automotive engine valve mechanism system shim and lifter of... Automotive engine valve mechanism system shim and lifter of...

2006-08-08

2006-08-08

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S193400, C427S450000

Reexamination Certificate

active

07086362

ABSTRACT:
Disclosed is a shim or a valve lifter for an automotive engine valve driving system that slides against a cam lobe of a camshaft to drive an intake/exhaust valve of an internal combustion engine. The shim or lifter has the top of a sliding surface thereof opposing the cam lobe and being coated with a hard carbon film. The hard carbon film has a surface hardness of 1500 to 4500 kg/mm2in terms of Knoop hardness, a thickness of 0.3 to 2.0 μm and a surface roughness Ry (μm) satisfying the following equation (A):in-line-formulae description="In-line Formulae" end="lead"?Ry<{(0.75−Hk/8000)×h+0.07/0.8}  (A)in-line-formulae description="In-line Formulae" end="tail"?where h is the thickness (μm) of the hard carbon film; and Hk is the knoop hardness (kg/mm2) of the hard carbon film. By imparting durability, reliability and a low friction coefficient to the hard carbon film that is said to be low in ductility to prevent the hard carbon film from becoming cracked and separated when applied to the sliding portion.

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