Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1992-03-16
1993-06-22
Cross, E. Rollins
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9033, 123196R, F01L 134, F01M 106, F01M 910
Patent
active
052208915
ABSTRACT:
A variable cam engine is provided with a plurality of cams which open and close an intake valve and an exhaust valve, a cam change-over mechanism which changes over these cams according to the rise of the supplied oil pressure, a lubrication path which supplies lubricating oil discharged by an oil pump to the engine parts, and an oil pressure path which supplies part of this oil to the cam change-over mechanism. A throttle is provided in the lubrication path. By throttling this throttle in the low engine speed region, the oil pressure in the oil pressure path is maintained and the cams can be changed over by the change-over mechanism even when the engine is running at a low speed of, for example, 2500 rpm.
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Inoue, K. et al., SAE Technical Paper Series 890675, "A High Power, Wide Torque Range, Efficient Engine with a Newly Developed Variable-Valve-Lift and-Timing Mechanism", Honda R&D Co., Ltd. (International Congress and Exposition, Detroit, Mich., Feb. 27-Mar. 3, 1989.
Gungi Mituo
Masuda Tsuyoshi
Nakamura Makoto
Sakurai Shigeru
Cross E. Rollins
Lo Weilun
Nissan Motor Co,. Ltd.
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