Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2006-10-27
2008-08-12
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090120, C123S090150, C464S160000, C251S012000, C137S625690
Reexamination Certificate
active
07409937
ABSTRACT:
A hydraulic control system for an internal combustion engine, includes a driven mechanism driven by hydraulic pressure fed through a flowing passage change-over valve. The flowing passage change-over valve includes a valve body formed with a plurality of ports which are respectively communicated with the supply passage and the oil passage, and a spool valve body slidably disposed in the valve body to open and close the plurality of ports, the ports including a supplying port communicated with the supplying passage. The maximum cross-sectional area of the supplying port is larger than a minimum cross-sectional area of the supplying passage. The flowing passage change-over valve is supplied with electric current to heat hydraulic fluid kept in the flowing passage change-over valve so as to lower a viscosity of the hydraulic fluid.
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Fujita Osamu
Hisahara Keiji
Ichikawa Toshiro
Sawada Takanori
Suga Seiji
Chang Ching
Foley & Lardner LLP
Hitachi , Ltd.
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