Apparatus for controlling engine valve performance

Details Apparatus for controlling engine valve performance Apparatus for controlling engine valve performance

1997-10-09

1998-09-01

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9033, 123 9034, 123196M, F02D 1302, F01L 1344

Patent

active

057996318

ABSTRACT:
A variable valve timing mechanism (VVT) for adjusting the valve timing of an intake valve of an internal combustion engine. The mechanism is hydraulically driven by oil pressure. An oil control valve (OCV) is provided on a cylinder head of the engine for controlling oil flow from a pump. A drainage pan in the cylinder head receives oil drained from various mechanical components of the engine. A drain passage drains oil from the control valve to a drain well. The oil in the drainage pan is also led to the drainage well. A wall, or dam, is formed between the drainage pan and the drainage well for restricting the oil flow from the drainage pan to the drainage well. This prevents the drainage well from being flooded when the flow rate of oil into the drainage pan increases dramatically, which improves the performance of the VVT mechanism.

REFERENCES:
patent: 4928641 (1990-05-01), Niizato et al.
patent: 5144921 (1992-09-01), Clos et al.
patent: 5170756 (1992-12-01), Szodfridt
patent: 5271360 (1993-12-01), Kano et al.
patent: 5483930 (1996-01-01), Moriya et al.
patent: 5669343 (1997-09-01), Adachi

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