Valve system for engine

Details Valve system for engine Valve system for engine

1997-04-10

1998-04-28

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Spring

123 9015, 123 9067, 123315, 123 9022, F01L 126, F01L 310

Patent

active

057432252

ABSTRACT:
A valve system for an engine comprises a plurality of intake or exhaust valves, adapted to be driven by cams of which the profiles are different from each other to make maximum valve lifts of the valves different from each other, and compression springs biassing the valves toward the corresponding closing directions, the springs being identical to each other. An initial length of the spring is made shorter as the maximum valve lift of the valve becomes smaller, to make an initial load of the spring larger as the maximum valve lift of the valve becomes smaller.

REFERENCES:
patent: 4446825 (1984-05-01), Giardini et al.
patent: 5269270 (1993-12-01), Suzuki
patent: 5558054 (1996-09-01), Ariga et al.
patent: 5664531 (1997-09-01), Kim
patent: 5669341 (1997-09-01), Ushirono et al.
Patent Abstracts of Japan, vol. 009, No. 268 (M-424), 25 Oct. 1985 & JP 60 113007 (Nissan Jidosha KK), 19 Jun. 1985.

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