Title:
INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2018/180558
Kind Code:
A1
Abstract:
Provided is an internal combustion engine that comprises: a decompression cam (112) that causes a curved protruding surface (129), which has a generating line that is parallel to a rotational axis of a cam shaft, to protrude from an imaginary cylindrical surface (122), which is coaxial with the camshaft, at a rotational speed less than a preset rotational speed; a convex decompression follower surface (133) that is a convex curved surface that is provided on an exhaust-side rocker arm (97b) outside the imaginary cylindrical surface (122), and that faces the imaginary cylindrical surface (122) and contacts the curved protruding surface (129) at a position closest to the imaginary cylindrical surface (122); and a concave decompression follower surface (134) that is provided upstream from the convex decompression follower surface (133) in the positive rotation direction of the camshaft, that is formed into a concave curved surface having a generating line that is parallel to the rotational axis of the camshaft, and that contacts the curved protruding surface (129). Due to this configuration, provided is an internal combustion engine that can further reduce a collision sound between a decompression cam and an exhaust-side rocker arm and a seat sound of an exhaust valve.
Inventors:
HIRAYAMA SHUJI (JP)
MORIMOTO YASUHIRO (JP)
MORIMOTO YASUHIRO (JP)
Application Number:
PCT/JP2018/010294
Publication Date:
October 04, 2018
Filing Date:
March 15, 2018
Export Citation:
Assignee:
HONDA MOTOR CO LTD (JP)
International Classes:
F01L13/08
Foreign References:
| JP2012163057A | 2012-08-30 | |||
| JP2014129794A | 2014-07-10 | |||
| JP6002269B1 | 2016-10-05 | |||
| JP2014129794A | 2014-07-10 |
Other References:
See also references of EP 3604748A4
Attorney, Agent or Firm:
OCHIAI & CO. (JP)
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