Internal-combustion engines – Poppet valve operating mechanism – Lubrication
Patent
1990-10-01
1992-03-24
Kamen, Noah P.
Internal-combustion engines
Poppet valve operating mechanism
Lubrication
123 9027, 74440, F01M 106
Patent
active
050978055
ABSTRACT:
A valve driving device of an engine under the present invention is provided with a cam shaft for exclusive use of intake for driving intake valves and a cam shaft for exclusive use of exhaust for driving exhaust valves. At least either the intake valve or the exhaust valve is pluralized and a transmitting member is trained between the cam shaft with more valves to drive and an engine output shaft. Gears to mesh with each other are provided on said two cam shafts. Under the above composition, only one pulley on the driven side or only one sprocket is required and therefore compactness of the engine can be realized. Also, rotation of the cam shaft having more valves to drive and large torque fluctuation can be stabilized and reliability of gears can be improved, without reinforcing the gears.
REFERENCES:
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patent: 4519264 (1985-05-01), Inui
patent: 4572117 (1986-02-01), Yoshikawa
patent: 4674452 (1987-06-01), Asanomi
patent: 4696201 (1987-09-01), Hattori et al.
patent: 4915066 (1990-04-01), Koshimoto et al.
P. Flocon, Toyota Corolla Multi-soupapes Et Maxi-Choix, L'Automobile Magazine, No. 496, Oct. 1987, pp. 74-75.
Hashimoto Kazuhiko
Iwata Noriyuki
Sado Osamu
Uesugi Tatsuya
Kamen Noah P.
Mazda Motor Corporation
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