Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1998-04-30
1999-04-13
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9018, 123 9031, 123 9015, F01L 1344, F01L 1300
Patent
active
058933450
ABSTRACT:
A valve characteristic control apparatus is provided with a simple structure in which a cam shaft having three-dimensional cams is axially displaced and the cam shaft is rotated with respect to a crank shaft by a ring gear. An axial driving mechanism axially displaces the intake cam shaft and thereby changes working angles of the three-dimensional cams. In this case, engagement of a spline formed on the cam shaft with teeth formed on an inner peripheral surface of the ring gear allows the cam shaft to axially move with respect to a pulley integrated with the crank shaft. A rotational driving mechanism axially displaces the ring gear, so that a helical spline formed on the pulley engages teeth formed on an outer peripheral surface of the ring gear and a spline formed on the cam shaft engages teeth formed on the inner peripheral surface of the ring gear. Thus, the cam shaft rotates relative to the pulley.
REFERENCES:
patent: 4399784 (1983-08-01), Foley
patent: 5080055 (1992-01-01), Komatsu et al.
patent: 5129407 (1992-07-01), Phillips
patent: 5367991 (1994-11-01), Asai et al.
patent: 5381764 (1995-01-01), Fukuma et al.
Hasegawa Tadao
Moriya Yoshihito
Sugimoto Kiyoshi
Lo Weilun
Toyota Jidosha & Kabushiki Kaisha
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