Title:
エンジン及びエンジン作業機
Document Type and Number:
Japanese Patent JP6603700
Kind Code:
B2
Abstract:
The temperature of exhaust gas discharged from a compact air-cooled engine used as a power source for an engine-driven working machine is reduced. An engine has a muffler 50 which is mounted directly to the exhaust opening of the cylinder, and a resin muffler cover 4 which covers the muffler. An exhaust gas restriction member 60 is provided to a wall surface of the muffler, and two exhaust passages 62, 64 serving as outlets for exhaust gas are formed in the exhaust gas restriction member 60. The exhaust passages are arranged independent of each other, and the streams EX1, EX2 of discharged exhaust gas are discharged so as to be slightly separated from each other as the streams EX1, EX2 flow away from the exhaust openings 63, 65. The separated streams EX1, EX2 of discharged exhaust gas form a negative pressure space NP between the streams EX1, EX2, and this promotes the introduction of a cooling air stream CA3 into the negative pressure portion. As a result, the temperature of the exhaust gas can be reduced.
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Inventors:
Naoto Hitotsubashi
Youhei Kinukawa
Youhei Kinukawa
Application Number:
JP2017502008A
Publication Date:
November 06, 2019
Filing Date:
January 29, 2016
Export Citation:
Assignee:
Koki Holdings Co., Ltd.
International Classes:
F01N3/02; F01N3/24; F01N13/00; F01N13/20; F01P1/06; F02B63/00; F02B63/02
Domestic Patent References:
| JP2006307690A | ||||
| JP201226350A |
Foreign References:
| US20030057016 |
Attorney, Agent or Firm:
Aoritsu patent business corporation