VALVE GEAR FOR ENGINE - YAMAHA MOTOR CO LTD

Title:

VALVE GEAR FOR ENGINE

Document Type and Number:

WIPO Patent Application WO/2011/043301

Kind Code:

A1

Abstract:

A valve gear for an engine includes: a camshaft which is supported by the cylinder head of the engine and on which cams having different valve lift characteristics are formed at predetermined intervals (pitches); a rocker shaft which is supported by the cylinder head so as to be parallel to the camshaft; and rocker arms which are rockably supported by the rocker shaft. A rocker arm is provided between one of cams and an intake valve or an exhaust valve and is configured to be movable in the direction of the axis of the rocker shaft, and the presser of the rocker arm which presses the intake valve or the exhaust valve extends in the axis direction by a length greater than each interval (pitch) of the cams. The valve gear includes a drive device for moving the rocker arms in one or the other direction along the axis by the interval at which the cams are formed.

Inventors:

KAMICHIKA TAKUROU (JP)

Application Number:

PCT/JP2010/067380

Publication Date:

April 14, 2011

Filing Date:

October 04, 2010

Export Citation:

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Assignee:

YAMAHA MOTOR CO LTD (JP)
KAMICHIKA TAKUROU (JP)

International Classes:

F01L13/00; F01L1/04; F01L1/18

Foreign References:

JP2001020710A	2001-01-23
JP3365805B2	2003-01-14
JPS63154437A	1988-06-27
JPH0243004A	1990-02-13
JP3365805B2	2003-01-14
JP2006520869A	2006-09-14
JP2009232203A	2009-10-08

Other References: