Internal-combustion engines – Poppet valve operating mechanism – Lubrication
Patent
1996-06-06
1997-01-28
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Lubrication
123 9051, 74569, F01L 114
Patent
active
055969593
ABSTRACT:
A shim for a tappet is used in a valve operating mechanism in an internal combustion engine. On the surface of the shim which a cam slidably contacts, there are provided a number of bores in which lubricating oil is put. When an oil film disappears on the surface by slidable contact with the cam, oil overflows from the bores onto the surface. By increasing oil-keeping capability on the surface of the shim, frictional resistance is reduced, thereby preventing wear in the shim and the cam. The bores may be filled with a lubricating solid such as molybdenum disulfide or plastics, such as polyethylene, silicone and Teflon.RTM.. The diameter of the bores may become larger as the bores extend away from the surface of the shim, thereby preventing the solid material from being displaced from the bores. The density of the bores on the shim surface can also be varied. The density of the bores in the central area of the shim surface can be greater than in the surrounding area.
REFERENCES:
patent: 4312900 (1982-01-01), Simpson
patent: 4856466 (1989-08-01), Ting et al.
patent: 4871266 (1989-10-01), Oda
patent: 4872432 (1989-10-01), Rao et al.
patent: 4909198 (1990-03-01), Shiraya et al.
patent: 5269268 (1993-02-01), Hara
Hamada Akihiro
Kenmoku Takeji
Umino Shinichi
Fuji Oozx Inc.
Lo Weilun
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