专利名称：ENGINE UNIT AND SADDLE-RIDING TYPE
VEHICLE
发明人：SAKURAI MIKINORI，桜井 幹記,IWAKI YOHEI，岩
城 洋平
申请号：JP2017063126
申请日：20170328
公开号：JP2017194052A
公开日：
20171026
专利内容由知识产权出版社提供
专利附图：
摘要：PROBLEM TO BE SOLVED: To obtain a configuration capable of attaining both high output of an engine and improvement of combustion stability at the time of low
load operation even if there is a restriction on the position of a throttle valve.SOLUTION: An engine unit 100 comprises a combustion chamber 70 having an intake port 71a and an exhaust port 71b, an intake passage 49a leading air in the atmosphere into the combustion chamber 70, an exhaust passage 49b discharging a gas in the combustion chamber to the atmosphere, an intake valve 62, an exhaust valve 64, and a throttle valve 40a regulating the opening area of the intake passage 49a. The throttle valve 40a, when the operation region of the engine unit 100 is in a predetermined low load operation region, regulates the opening area such that, during one cycle, an intake pressure between the throttle valve 40a in the intake passage 49a and the combustion chamber 70 satisfies a predetermined relationship.SELECTED DRAWING: Figure 3
申请人：YAMAHA MOTOR CO LTD,ヤマハ発動機株式会社
地址：静岡県磐田市新貝２５００番地
国籍：JP
代理人：鈴木 一晃
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