VALVE MECHANISM FOR INTERNAL COMBUSTION ENGINES

Title:

VALVE MECHANISM FOR INTERNAL COMBUSTION ENGINES

Document Type and Number:

WIPO Patent Application WO/2004/031541

Kind Code:

A1

Abstract:

A valve mechanism for internal combustion engines, capable of increasing the negative valve overlap period when the amount of a maximum lift for the intake valve or the exhaust valve is small. The valve mechanism (V) has intake-side and exhaust-side characteristic changing mechanisms (Mi, Me) for changing the operating characteristics of the intake valve (7) and exhaust valve (8). Each of the characteristic changing mechanisms (Mi, Me) comprises a control cam (14) rotatable integrally with a cam shaft (13), an electric motor (30) for swinging a holder (15) pivotally supported by the cam shaft (13) around the axis of the cam shaft (13), a sub-rocker lever (16) pivotally supported by the holder (15) and adapted to be swung by the control cam (14), and a valve mechanism cam (18) for swinging main rocker levers (10, 11) when it is swung around the axis of the cam shaft (13) by the swinging of the holder (15) and sub-rocker lever (16). The electric motor (30) swings the holder (15) in such a manner that as the amount of a maximum lift of the intake valve (7) decreases, the valve opening timing is angularly delayed, and concurrently therewith as the amount of a maximum lift of the exhaust valve (8) decreases, the valve closing timing is angularly advanced.

Inventors:

INOMOTO YUTAKA (JP)
KUROKI MASAHIRO (JP)
TSUTSUMIZAKI TAKASHI (JP)
TANABE KAZUYA (JP)

Application Number:

PCT/JP2003/011042

Publication Date:

April 15, 2004

Filing Date:

August 29, 2003

Export Citation:

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Assignee:

HONDA MOTOR CO LTD (JP)
INOMOTO YUTAKA (JP)
KUROKI MASAHIRO (JP)
TSUTSUMIZAKI TAKASHI (JP)
TANABE KAZUYA (JP)

International Classes:

F01L13/00; (IPC1-7): F01L13/00

Foreign References:

US5937809A	1999-08-17
US6019076A	2000-02-01
JPH01167425A	1989-07-03
US20010037781A1	2001-11-08
US20020007810A1	2002-01-24
US6311659B1	2001-11-06

Other References: