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    • 2. 发明专利
    • Stratified scavenging two-stroke-cycle engine
    • 分阶段切割两冲程循环发动机
    • JP2014129739A
    • 2014-07-10
    • JP2012286765
    • 2012-12-28
    • Makita Corp株式会社マキタ
    • TAKAYANAGI YOSHIAKINAKADATE HIDEYUKIODA KOHEI
    • F02B25/22F02B25/16
    • F02B25/20F02B25/14F02B25/22F02B33/04F02B33/30F02B43/02F02B75/02F02B2075/025F02B2700/037F02F3/24F02F7/0036F02M35/1017F02M35/10275
    • PROBLEM TO BE SOLVED: To increase air flow for pre-scavenging.SOLUTION: There are formed a first scavenging passage 36 that extends from a first scavenging intake 362 that opens to the inside of a crankcase to a first scavenging port 364 that opens to the inside of a cylinder, and a second scavenging passage 38 that extends from a second scavenging intake 382 that opens to the inside of the crankcase to a second scavenging port 384 that opens to the inside of the cylinder. The first scavenging passage 36 and the second scavenging passage 38 communicate with each other via a communicating portion 44. An air passage 42 is connected to the first scavenging passage 36 at a position closer to the first scavenging intake 362 than the communicating portion 44. There are provided a first check valve 46 that blocks a flow from the first scavenging passage 36 to the inside of the crankcase, and a second check valve 48 that blocks a flow from the first scavenging passage 36 to the outside through the air passage 42. Air for pre-scavenging is introduced into the first scavenging passage 36 from the air passage 42, and some of the air is introduced into the second scavenging passage 38 via the communicating portion 44.
    • 要解决的问题:增加用于预清扫的空气流。解决方案:形成有第一扫气通道36,其从开口到曲轴箱内部的第一扫气进口362延伸到第一扫气端口364,第一扫气通道36向 以及第二扫气通道38,其从通向曲轴箱内部的第二扫气入口382延伸到通向气缸内部的第二扫气口384。 第一扫气通道36和第二扫气通道38经由连通部分44相互连通。空气通道42与第一扫气通道36相比比连通部分44更靠近第一扫气进口362的位置连接。 设置有阻挡从第一扫气通道36到曲轴箱内部的流动的第一止回阀46以及阻止从第一扫气通道36通过空气通道42流到外部的第二止回阀48.空气 用于预清扫从空气通道42引入到第一扫气通道36中,并且一些空气经由连通部44被引入到第二扫气通道38中。