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1.发明公开
公开(公告)号：EP3263878A4
公开(公告)日：2018-05-02
申请号：EP15883326
申请日：2015-11-04
申请人： YAMAHA MOTOR CO LTD
摘要： An object of the present teaching is to provide an air-cooled engine that is able to improve cooling efficiency, and particularly cooling efficiency at a time of initial sliding of a piston part. The present teaching provides an air-cooled engine including a piston part and a cylinder body part with a sliding surface on which the piston part is slidable. The cylinder body part includes a heat dissipation portion provided on an outer surface of the cylinder body part, and is made of an Al-containing metal. At least an inner peripheral portion of the cylinder body part, which includes the sliding surface, is made of an Al alloy with an Si content of 16% by mass or more. The sliding surface is configured such that a plurality of substantially parallel linear grooves are formed therein and Si primary crystal grains having an average crystal grain diameter of 8 µm or more and 50 pm or less are exposed thereon so as to be contactable with the piston part. An Al contact portion where an Al alloy base material has contact with the piston part, which is formed between the plurality of linear grooves, is exposed on the sliding surface at a location between two adjacent Si primary crystal grains. Al contained in the cylinder body part is physically continuous from the Al contact portion to the heat dissipation portion.
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公开(公告)号：EP3263876A4
公开(公告)日：2018-05-02
申请号：EP15883324
申请日：2015-11-04
申请人： YAMAHA MOTOR CO LTD
摘要： An object of the present teaching is to provide an engine that is able to suppress generation of scuffs more effectively. The present teaching provides an engine including a piston part and a cylinder body part with a sliding surface on which the piston part is slidable. The cylinder body part is made of an Al alloy with an Si content of 16% by mass or more. The sliding surface has Si primary crystal grains and an Al alloy base material exposed thereon so as to be contactable with the piston part, the Si primary crystal grains having an average crystal grain diameter of 8 µm or more and 50 µm or less, the sliding surface having a plurality of substantially parallel linear grooves formed therein at such a pitch that a plurality of linear grooves exist between the Si primary crystal grains.
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公开(公告)号：EP3263877A4
公开(公告)日：2018-05-02
申请号：EP15883325
申请日：2015-11-04
申请人： YAMAHA MOTOR CO LTD
摘要： An object of the present teaching is to provide an engine that is able to suppress generation of scuffs at or near the top dead center more effectively. The present teaching provides an engine including a piston part and a cylinder body part with a sliding surface on which the piston part is slidable. The cylinder body part is made of an Al alloy with an Si content of 16% by mass or more. The cylinder body part includes Si primary crystal grains having an average crystal grain diameter of 8 µm or more and 50 µm or less, Si eutectic crystal grains having an average crystal grain diameter less than the average crystal grain diameter of the Si primary crystal grains, and an Al alloy base material. The sliding surface is configured such that, at least in an upper quarter region of the sliding surface, the Si primary crystal grains and the Al alloy base material are exposed so as to be contactable with the piston part, and a plurality of substantially parallel linear grooves are formed at a pitch greater than the average crystal grain diameter of the Si primary crystal grains so that the plurality of substantially parallel linear grooves have a portion that exists between adjacent ones of the Si primary crystal grains. The plurality of substantially parallel linear grooves have a depth equal to or more than one-third of an upper limit value of a diameter range of the Si eutectic crystal grains in a grain size distribution of Si crystal grains in the cylinder body part.
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