Internal-combustion engines – Poppet valve operating mechanism – Camshaft drive means
Patent
1985-09-26
1986-09-09
Lazarus, Ira S.
Internal-combustion engines
Poppet valve operating mechanism
Camshaft drive means
123 9027, 123DIG7, F01L 102
Patent
active
046102248
ABSTRACT:
A configuration for a V type double overhead cam shaft engine which has left and right cylinder banks and cylinder heads. Left and right intake cam shafts are fitted to the left and right cylinder heads. The left intake cam shaft is substantially identically formed to the right intake cam shaft and is fitted in reversed alignment thereto. Similarly, left and right exhaust cam shafts are fitted to the left and right cylinder heads, and the left exhaust cam shaft is substantially identically formed to the right exhaust cam shaft and is fitted in reversed alignment thereto. One pair of the same type of the cam shafts are driven in a determinate phase relationship with the engine crank shaft. A pair of gears, with the same number of teeth, are provided on the left intake and exhaust cam shafts, and mesh together so as to rotationally couple together them in a determinate phase relationship. Similarly, a pair of gears, with the same number of teeth, are provided on the right intake and exhaust cam shafts, and mesh together so as to rotationally couple together them in a determinate phase relationship. At the left and right cylinder banks, the number n of teeth of the phase difference of the pairs of gears is determined by the equation n=(gamma/180.degree.)N, where gamma is the phase difference angle of the intake and exhaust cam shafts, and N is the number of teeth on the gears. The engine may be a six cylinder engine.
REFERENCES:
patent: 3673990 (1972-04-01), Alfieri
patent: 3732745 (1973-05-01), Jackson
patent: 4380216 (1983-04-01), Kandler
patent: 4480603 (1984-11-01), Tsuboi
Lazarus Ira S.
Toyota Jidosha & Kabushiki Kaisha
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