Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1997-09-11
1998-08-25
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, 123 4133, 123196A, 123196AB, F01L 1344, F01L 1300, F02D 1302
Patent
active
057973636
ABSTRACT:
A variable valve timing mechanism (VVT) for adjusting the valve timing of an intake valve of an internal combustion engine. The VVT has first and second pressure chambers for receiving oil. An oil control valve (OCV) is provided for controlling oil flow from a pump. Passages are provided for connecting the OCV to the pressure chambers to supply oil to the chambers in a controlled manner. A filter is located in the passage for filtering the oil. The filter is supported in water jacket where coolant flows. The filter is heated by the coolant to decrease the flow resistance of the oil.
REFERENCES:
patent: 4174699 (1979-11-01), Gill
patent: 4352455 (1982-10-01), Moser et al.
patent: 5271360 (1993-12-01), Kano et al.
Lo Weilun
Toyota Jidosha & Kabushiki Kaisha
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