Title:
多気筒内燃機関のシリンダヘッド
Document Type and Number:
Japanese Patent JP6804938
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a cylinder head which can largely suppress the generation of thermal strain.SOLUTION: In an internal combustion engine having three or more cylinders, a center cooling water jacket 15, an exhaust-side upper cooling water jacket 16 and an exhaust-side lower cooling water jacket 17 are formed in a cylinder head. The center cooling water jacket 15, the exhaust-side upper cooling water jacket 16 and the exhaust-side lower cooling water jacket 17 are separated from one another. A bypass passage 29 for surrounding an exhaust port from below is formed in a point corresponding to an intermediate cylinder located between both ends of a cylinder row out of the center cooling water jacket 15. Since a peripheral part of the exhaust port corresponding to the intermediate cylinder (intermediate combustion chamber) is firmly cooled, and a rise of a temperature is suppressed, it can be largely suppressed that thermal strain is generated in the cylinder head as a whole. Since the bypass passage is formed into a tunnel shape, the lowering of rigidity does not occur compared with the case that a groove-shaped cooling water passage is formed at a lower face of the cylinder head.SELECTED DRAWING: Figure 6
Inventors:
Wataru Mimoda
Yousuke Nakata
Yousuke Nakata
Application Number:
JP2016213692A
Publication Date:
December 23, 2020
Filing Date:
October 31, 2016
Export Citation:
Assignee:
Daihatsu Motor Co., Ltd.
International Classes:
F02F1/36; F01P3/02; F02F1/42
Domestic Patent References:
| JP2008075506A | ||||
| JP2015121180A | ||||
| JP2012189076A | ||||
| JP2014139421A | ||||
| JP2014145285A | ||||
| JP2012057468A |
Foreign References:
| US20140202143 | ||||
| US20120227687 | ||||
| US20150059339 | ||||
| US20100083920 |
Attorney, Agent or Firm:
Hiroyuki Nishi
Ryuichi Watanabe
Ryuichi Watanabe