MECHANICAL LASH ADJUSTER

WIPO Patent Application WO/2017/216946

A1

Provided is a lash adjuster that can automatically adjust a valve clearance. A lash adjuster (20) for adjusting a valve clearance is interposed between an axial end portion of a valve (10) that is biased in a valve-closing direction by a coil spring (14), and a cam (19a) that is a valvetrain structural member. The lash adjuster (20) includes: a plunger (24) upon which the pressing force of the cam (19a) acts as an axial force; a housing (22) that is threadedly engaged with the plunger (24) in the axial direction, and is held so as to be immobilized in the circumferential direction of said threaded engagement portion; and a coil spring (26) that biases the plunger (24) in the reverse direction of the biasing force of the coil spring (14). A flank angle (θ) and a lead angle (α) of the thread ridges of the "threads" of the threaded engagement portion are set to prescribed values. When the threaded engagement portion becomes independent and a lateral force (T) oscillates the plunger (24), which is subjected to axial force, by an amount corresponding to backlash, the threaded engagement portion undergoes sliding rotation so as to move in the axial force direction, whereby an increase/decrease in the valve clearance is automatically adjusted.

KAMEDA MICHIHIRO (JP)
OZAWA HIROYUKI (JP)
INOUE MASAAKI (JP)

PCT/JP2016/068045

December 21, 2017

June 17, 2016

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NITTAN VALVA (JP)

F01L1/22

WO2013136508A1	2013-09-19
WO2008081534A1	2008-07-10

JPH04231610A

1992-08-20

YAGI Hidehito et al. (JP)

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