公开(公告)号：US10718243B2

公开(公告)日：2020-07-21

申请号：US15551039

申请日：2016-01-29

Applicant: Hitachi Koki Co., Ltd.

Inventor： Naoto Ichihashi ,  Youhei Kinugawa

IPC: F01N3/05 ,  F01P5/06 ,  F01P1/06 ,  F01P5/02 ,  F01N3/28 ,  F01N13/18 ,  F02B63/02 ,  F01N1/08 ,  F01N13/10 ,  F01N1/14 ,  F01N3/06 ,  F01P1/02 ,  F01P5/04 ,  F02F1/06 ,  F02B75/02

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 mounted directly to the exhaust opening of the cylinder, and a resin muffler cover covering the muffler. An exhaust gas restriction member is provided to a wall surface of the muffler, and two exhaust passages serving as outlets for exhaust gas are formed in the exhaust gas restriction member. The exhaust passages are arranged independent of each other, and the streams of discharged exhaust gas are discharged to be slightly separated from each other as the streams flow away from the exhaust openings. The separated streams of discharged exhaust gas form a negative pressure space between the streams promoting the introduction of a cooling air stream into the negative pressure portion. Thus, the temperature of the exhaust gas can be reduced.

公开(公告)号：USD849795S1

公开(公告)日：2019-05-28

申请号：US29555290

申请日：2016-02-19

Applicant: Hitachi Koki Co., Ltd.

Designer： Takeshi Taniguchi ,  Shinichi Kakefuda ,  Youhei Kinugawa ,  Keisuke Ikeda ,  Hisashi Irokawa