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公开(公告)号：US09726070B2
公开(公告)日：2017-08-08
申请号：US14261945
申请日：2014-04-25
申请人： MAKITA CORPORATION
IPC分类号： F02B25/00 , F02B29/00 , F02M35/10 , F02B25/22 , F02B25/14 , F02F7/00 , F02B63/02 , F02B75/02
CPC分类号： F02B29/00 , F02B25/14 , F02B25/22 , F02B63/02 , F02B2075/025 , F02F7/0036 , F02M35/1019
摘要： An air-leading type, stratified scavenging two-stroke engine. The engine including a cylinder member and a crankcase joined therewith has an intake passage, an exhaust passage, first and second scavenging passages, a communicating portion and an air passage. The intake passage, the exhaust passage and the air passage are formed in the cylinder member. The first and the second scavenging passages each has a cylinder member-side passage and a crankcase-side passage. The cylinder member-side passages of both of the first and the second scavenging passages communicate with each other via the communicating portion. The air passage is connected to the cylinder member-side passage of the first scavenging passage. In the engine, air for pre-scavenging is introduced from the air passage through a check valve into the cylinder member-side passage of the first scavenging passage, and a part of the introduced air flows into the second scavenging passage through the communicating portion.
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公开(公告)号：US20150007802A1
公开(公告)日：2015-01-08
申请号：US14373670
申请日：2013-01-31
申请人： MAKITA CORPORATION
发明人： Kenji Imafuku
摘要： There is provided a two-stroke engine configured to effectively prevent blow-by of the scavenging air from the discharge port and to be able to improve the engine output while abating pollution. The two-stroke engine includes a cylinder having an exhaust port and a scavenging port, and a piston, wherein: the piston has a top surface; a piston concave portion is provided in the top surface in the discharge direction; an entire surface of the piston concave portion is formed in an approximately spherical shape; and a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the discharge direction to a deepest portion is steeper than a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the anti-discharge direction to the deepest portion.
摘要翻译： 提供一种二冲程发动机，其被配置为有效地防止来自排出口的清除空气的吹气，并且能够在减轻污染的同时改善发动机输出。 二冲程发动机包括具有排气口和扫气口的气缸和活塞，其中：活塞具有顶表面; 活塞凹部在排出方向的上表面设置， 活塞凹部的整个表面形成为大致球形; 并且从活塞凹部的排出方向的外周缘向最深部延伸的活塞凹部的倾斜比从活塞凹部的活塞凹部的外周缘向 防排放方向最深处。
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公开(公告)号：US09719416B2
公开(公告)日：2017-08-01
申请号：US14262013
申请日：2014-04-25
申请人： MAKITA CORPORATION
CPC分类号： F02B75/02 , F02B25/14 , F02B25/22 , F02B63/02 , F02B2075/025
摘要： A stratified scavenging two-stroke engine includes: an intake passage that connects an intake opening through an outer surface of a cylinder member with an intake port opening to the inside of a cylinder, and supplies gaseous mixture of fuel and air; an exhaust passage that connects an exhaust outlet opening through the outer surface of the cylinder member with an exhaust port opening to the inside of the cylinder, and discharges combustion gas; a scavenging passage; and an air passage that connects an air inlet opening through the outer surface of the cylinder member with the scavenging passage and supplies pre-scavenging air into the scavenging passage. The intake and the air inlet are arranged at positions opposite from the exhaust port across the axis of the cylinder, and arranged side by side in a substantially circumferential direction of the cylinder or a direction substantially perpendicular to the axis of the cylinder.
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公开(公告)号：US09316145B2
公开(公告)日：2016-04-19
申请号：US14373670
申请日：2013-01-31
申请人： MAKITA CORPORATION
发明人： Kenji Imafuku
摘要： There is provided a two-stroke engine configured to effectively prevent blow-by of the scavenging air from the discharge port and to be able to improve the engine output while abating pollution. The two-stroke engine includes a cylinder having an exhaust port and a scavenging port, and a piston, wherein: the piston has a top surface; a piston concave portion is provided in the top surface in the discharge direction; an entire surface of the piston concave portion is formed in an approximately spherical shape; and a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the discharge direction to a deepest portion is steeper than a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the anti-discharge direction to the deepest portion.
摘要翻译： 提供一种二冲程发动机，其被配置为有效地防止来自排出口的清除空气的吹气，并且能够在减轻污染的同时改善发动机输出。 二冲程发动机包括具有排气口和扫气口的气缸和活塞，其中：活塞具有顶表面; 活塞凹部在排出方向的上表面设置， 活塞凹部的整个表面形成为大致球形; 并且从活塞凹部的排出方向的外周缘向最深部延伸的活塞凹部的倾斜比从活塞凹部的活塞凹部的外周缘向 防排放方向最深处。
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