Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1995-02-28
1996-06-25
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 906, F01L 1300, F02B 7502
Patent
active
055290329
ABSTRACT:
A valve-operation control system for an internal combustion engine includes a timing transmitting device for transmitting the rotational power of a crankshaft at a speed reduction ratio of 1/4 to a cam shaft, and intake-side and exhaust-side valve operating devices. Each of the valve operating device includes a first cam provided on the cam shaft and having a single cam lobe protruding outwardly with a valve-opening profile suitable for an extremely low-speed operation of the engine, a second cam provided on the cam shaft and having a pair of cam lobes provided at locations circumferentially spaced apart through 180 degrees to protrude outwardly with an opening profile suitable for a low-speed operational state of the engine, a third cam provided on the cam shaft and having a pair of cam lobes provided at locations circumferentially spaced apart through 180 degrees to protrude outwardly with an opening profile suitable for a high-speed operational state of the engine, with first, second and third rocker arms following the first, second and third cams, respectively. A connection switchover device is provided in the first, second and third rocker arms for switching the selective connection and disconnection of the rocker arms in accordance with the operational state of the engine. The first rocker arm is operatively connected to the intake or exhaust valves for operation of the valves in an 8-cycle mode to inhibit the discharge of a harmful hydrocarbons at an extremely slow speed of the engine.
REFERENCES:
patent: 5107805 (1992-04-01), Butterfield et al.
patent: 5363818 (1994-11-01), Iwata et al.
patent: 5388552 (1995-02-01), Sugimoto et al.
Nakajima Kenji
Nakayama Yukio
Oikawa Toshihiro
Honda Giken Kogyo Kabushiki Kaisha
Lo Weilun
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