DIRECT-ACTION VALVE LIFTER FOR INTERNAL COMBUSTION ENGINE

Title:

DIRECT-ACTION VALVE LIFTER FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/2007/015315

Kind Code:

A1

Abstract:

[PROBLEMS] A direct-action valve lifter having reduced number of parts and simple structure and capable of being switched to high lift and low lift. [MEANS FOR SOLVING PROBLEMS] The valve lifter is interposed between a cam and a valve stem. The cam (20) has a high lift cam (22) and low lift cams (24) integrated together, and the valve lifter (30) has a side lifter (32) slidingly in contact with a low lift cam, a center lifter (40) slidingly in contact with a high lift cam, and a hydraulic means (hydraulic path)(11b) for sliding the center lifter (40) in order to switch the amount of valve lift between two stages of high and low. A slit (33) for causing the high lift cam to strike at the air is provided at the top of a cylindrical lifter body so that the lifter body functions as the side lifter (32) having low lift cam sliding contact surfaces (32a). A hole (34) orthogonal to the slit (33) is provided in the lifter body, and the piston-type center lifter (40) slid by hydraulic pressure is provided in the hole (34). When the center lifter (40) is at a position corresponding (not corresponding) to the slit (33), it is a high (low) lift mode. In the valve lifter, the number of parts is reduced and the structure is simple, a dimentional tolerance required for each part is relaxed, and work for assembling each part is simplified.

Inventors:

NAGADO MASAYASU (JP)
ANDO TERUAKI (JP)

Application Number:

PCT/JP2005/015520

Publication Date:

February 08, 2007

Filing Date:

August 26, 2005

Export Citation:

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Assignee:

NITTAN VALVA (JP)
NAGADO MASAYASU (JP)
ANDO TERUAKI (JP)

International Classes:

F01L13/00

Foreign References:

JPH08177426A	1996-07-09
JPH08284628A	1996-10-29
JPH09170412A	1997-06-30
JPH09177525A	1997-07-08

Other References: