公开(公告)号：US20140318515A1

公开(公告)日：2014-10-30

申请号：US14261945

申请日：2014-04-25

Applicant: MAKITA CORPORATION

Inventor： Kenji IMAFUKU ,  Yoshifumi WATANABE ,  Hideaki HIRANO ,  Junichi MASUDA

IPC: F02B29/00 ,  F02B63/02

CPC classification number: F02B29/00 ,  F02B25/14 ,  F02B25/22 ,  F02B63/02 ,  F02B2075/025 ,  F02F7/0036 ,  F02M35/1019

Abstract: 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.

Abstract translation: 空气领先型，分层扫气二冲程发动机。 包括与其连接的气缸构件和曲轴箱的发动机具有进气通道，排气通道，第一和第二扫气通道，连通部分和空气通道。 进气通道，排气通道和空气通道形成在气缸构件中。 第一和第二扫气通路各具有圆筒部件侧通路和曲轴箱侧通路。 第一和第二扫气通道的气缸构件侧通道经由连通部分相互连通。 空气通道连接到第一扫气通道的气缸构件侧通道。 在发动机中，用于预清扫的空气从空气通道通过止回阀引入第一扫气通道的气缸构件侧通道中，并且一部分引入的空气通过连通部分流入第二扫气通道。

公开(公告)号：US20140318517A1

公开(公告)日：2014-10-30

申请号：US14262013

申请日：2014-04-25

Applicant: MAKITA CORPORATION

Inventor： Kenji IMAFUKU ,  Junichi MASUDA ,  Yoshifumi WATANABE ,  Hideaki HIRANO

IPC: F02B75/02

CPC classification number: F02B75/02 ,  F02B25/14 ,  F02B25/22 ,  F02B63/02 ,  F02B2075/025

Abstract: 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.

Abstract translation: 分层清扫二冲程发动机包括：进气通道，其将通过气缸构件的外表面的进气口与通向气缸内部的进气口连接，并且供应燃料和空气的气体混合物; 排气通道，其将通过所述气缸构件的外表面的排气出口开口与通向所述气缸的内部的排气口连接，并排出燃烧气体; 清扫通道 以及空气通道，其将通过所述气缸构件的外表面的空气入口与所述扫气通道相连，并将预除空气供应到所述扫气通道中。 吸入口和空气入口布置在穿过气缸的轴线的排气口的相对的位置处，并且沿着圆柱体的大致圆周方向或者大致垂直于气缸的轴线的方向并排布置。