Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
VALVETRAIN AND MECHANICAL LASH ADJUSTER
Document Type and Number:
WIPO Patent Application WO/2017/217493
Kind Code:
A1
Abstract:
Provided are a valvetrain and a mechanical lash adjuster with which it is possible to automatically and reliably adjust a valve clearance. This valvetrain includes: a cam (19a); a valve (10) that is biased in a valve-closing direction by a valve spring (14); a rocker arm (16); and a lash adjuster (20). The lash adjuster (20) includes: a plunger (24) to which the pressing force of the cam (19a) and the biasing force of the valve spring (14) are transmitted via the rocker arm (16); a housing (22) that, on the basis of rotation relative to the plunger (24), forms a threaded engagement portion (30) that contracts the plunger (24), said housing (22) being held so as to be unrotatable in the circumferential direction of the threaded engagement portion (30); and a compression coil spring (26, 26a) that biases the plunger (24) in the elongation direction. The threaded engagement portion (30) is set such that sliding rotation at the threaded engagement portion (30) is suppressed when a load acts on the plunger (24) in either the elongation or contraction direction of the plunger (24), and said suppression of sliding rotation at the threaded engagement portion (30) is relaxed when a lateral load acts on the plunger (24).

Inventors:
KAMEDA Michihiro (LTD. 518 Soya, Hadano-sh, Kanagawa 31, 〒2570031, JP)
NIIRO Masaaki (LTD. 518 Soya, Hadano-sh, Kanagawa 31, 〒2570031, JP)
Application Number:
JP2017/022123
Publication Date:
December 21, 2017
Filing Date:
June 15, 2017
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NITTAN VALVE CO., LTD. (518 Soya, Hadano-shi Kanagawa, 31, 〒2570031, JP)
International Classes:
F01N1/22
Domestic Patent References:
WO2013136508A12013-09-19
Foreign References:
JP2003521624A2003-07-15
JP2009270564A2009-11-19
JPS55131513A1980-10-13
Attorney, Agent or Firm:
YAGI Hidehito et al. (AOBA INTERNATIONAL PATENT & TRADEMARK Stork Building Hongoku 5F, 3-2-6 Nihonbashi Hongoku-cho, Chuo-k, Tokyo 21, 〒1030021, JP)
Download PDF: