Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1997-09-23
1998-09-29
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9034, 123 9036, F02D 1302, F01L 134, F01L 1300
Patent
active
058133763
ABSTRACT:
An engine has a crankshaft, a combustion chamber and a valve. The valve opens and closes the combustion chamber. The valve has a lift characteristic that is altered by a control device according to a change of hydraulic pressure therein. The engine has a lubricant passage that is connected with an oil pump and supplies oil to a mechanism formed by parts slidably connecting one another within the engine. A hydraulic pressure passage extends into an interior of the control device to exchange the hydraulic pressure with the control device, thereby the control device is actuated to alter the lift characteristic. The oil pump supplies the oil to the pressure passage when connected with the pressure passage. The oil pan supplies the oil to the pressure passage when connected with the pressure passage. A switching valve selects one of the oil pump and the oil pan to connect the selected one with the control device based on the engine speed.
REFERENCES:
patent: 4794892 (1989-01-01), Konno
patent: 4800850 (1989-01-01), Yoshida et al.
patent: 4807574 (1989-02-01), Shibata et al.
patent: 5195474 (1993-03-01), Urata et al.
patent: 5220891 (1993-06-01), Nakamura et al.
patent: 5495832 (1996-03-01), Fujii et al.
patent: 5537963 (1996-07-01), Hasebe et al.
Kawase Hiroyuki
Sakaguchi Yuichi
Shimizu Koichi
Suzuki Hiromasa
Yoshihara Yuuji
Lo Weilun
Toyota Jidosha & Kabushiki Kaisha
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