VALVE GEAR FOR ENGINE

WIPO Patent Application WO/2015/093265

A1

This valve gear for an engine is provided with a camshaft (3) that has a cam (7) for driving an intake valve, a rocker shaft (24), and a first rocker arm (21) that has a pressing piece (23). The valve gear is provided with a control arm (25) that rocks about the rocker shaft (24). The valve gear is provided with a second rocker arm (22) that is rockably supported by the control arm (25) and that has a pressing member (31) that is held between the cam (7) and the pressing piece (23). The valve gear is provided with a fixed stopper (26) for regulating the rocking of the control arm (25) in one direction and a movable stopper (28) for regulating the rocking of the control arm (25) in the other direction. The movable stopper (28) is movable between a first position, where the angle that the control arm (25) can rock becomes zero, and a second position, where the control arm (25) can rock. While the movable stopper (28) is located in a position other than the first position, with the pressing member (31) in contact with a base circle portion (7a) of the cam (7), the control arm (25) rocks into an initial position that corresponds to one end in the rocking range. With the pressing member (31) in contact with a nose portion (7b) of the cam (7), the control arm (25) rocks into a final position that corresponds to the other end in the rocking range. A valve gear for an engine capable of controlling the size of a valve operating angle is thus provided.

KAMICHIKA TAKUROU (JP)

PCT/JP2014/081696

June 25, 2015

December 01, 2014

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YAMAHA MOTOR CO LTD (JP)

F01L13/00

WO2006025565A1

2006-03-09

JP2002371816A	2002-12-26
JP2007278097A	2007-10-25
JP2003239712A	2003-08-27
JPH06307219A	1994-11-01

YAMAKAWA, Masaki et al. (JP)
Masaki Yamakawa (JP)

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