公开(公告)号：US5054441A

公开(公告)日：1991-10-08

申请号：US353322

申请日：1989-05-15

申请人： Yoshihide Nakatani ,  Shigeichi Okada ,  Eiji Yaezawa ,  Makoto Takata ,  Takafumi Nakahara

发明人： Yoshihide Nakatani ,  Shigeichi Okada ,  Eiji Yaezawa ,  Makoto Takata ,  Takafumi Nakahara

IPC分类号： F02B25/14 ,  F02B75/02 ,  F02B77/04 ,  F02F1/22

CPC分类号： F02B77/04 ,  F02B25/14 ,  F02F1/22 ,  F02B2075/025

摘要： For the purpose of preventing a decompression passageway in a two-cycle engine from being blocked by carbon soot, facilitating manufacture of a two-cycle engine having decompression structure and eliminating reduction of output power of the two-cycle engine caused by the decompression structure, a known two-cycle engine includes a scavenging passageway formed along an inner wall of a cylinder. The scavenging passageway is directed in the axial direction of the cylinder and communicates with a crank case of the engine. A decompression groove extends in the axial direction of the cylinder on the upstream side of a cylinder cooling airflow at a top end portion of the scavenging passageway. The width and depth of the decompression groove are either varied along the axial direction of the groove so as to be narrowed towards a tip end thereof directed toward a plug, or are provided with a narrowed portion of venturi shape.

公开(公告)号：US5230314A

公开(公告)日：1993-07-27

申请号：US901579

申请日：1992-06-19

申请人： Yoshitaka Kawahara ,  Masaaki Nakachi ,  Yoshihide Nakatani

发明人： Yoshitaka Kawahara ,  Masaaki Nakachi ,  Yoshihide Nakatani

IPC分类号： F01L7/02 ,  F02B3/06 ,  F02B33/26 ,  F02B33/30 ,  F02B75/02

CPC分类号： F02B33/26 ,  F01L7/022 ,  F02B33/30 ,  F02B2075/027 ,  F02B3/06

摘要： A 4-cycle internal combustion engine including a crankcase, a cylinder, a cylinder head, a piston adapted to reciprocate within the cylinder, a combustion chamber formed by the piston, the cylinder and the cylinder head, and a crankshaft connected to the piston via a connecting rod, is improved in order to enhance its thermal efficiency, to reduce exhaust emissions and to make it possible to operate the engine while the engine is in any attitude. The improvements reside in an intake passage and an exhaust passage provided in the cylinder head, a rotary valve rotating synchronously with the crankshaft at a speed one-half of that of the latter for placing the intake passage and the exhaust passage in communication with the cylinder during an intake stroke and an exhaust stroke of the piston, respectively, a check valve through which the intake passage communicates with the interior of the crankcase so that only flow is allowed from the crankcase towards the intake passage, and a carburetor device for feeding a fuel mixture of air, fuel and lubricant oil into the crankcase. The suction of the fuel mixture into the crankcase chamber as well as the feeding of the fuel mixture within the crankcase to the intake passage are made possible by the variation in pressure within the crankcase chamber caused by the reciprocation of the piston.

摘要翻译： 一种四冲程内燃机，包括曲轴箱，气缸，气缸盖，适于在气缸内往复运动的活塞，由活塞，气缸和气缸盖形成的燃烧室以及连接到活塞的曲轴通过 改进了连杆，以提高其热效率，减少废气排放，并且使得在发动机处于任何姿态下可以操作发动机。 改进在于设置在气缸盖中的进气通道和排气通道，与曲轴同步旋转的旋转阀，其速度是后者的一半，用于将进气通道和排气通道与气缸连通 在活塞的进气冲程和排气冲程期间分别具有止回阀，进气通道通过该止回阀与曲轴箱的内部连通，使得仅允许从曲轴箱流向进气通道的流动，以及用于供给 将空气，燃料和润滑油的燃料混合到曲轴箱中。 通过由活塞的往复运动引起的曲轴箱室内的压力变化，使燃料混合物进入曲轴箱室中的吸入以及曲轴箱内的燃料混合物进入进气通道成为可能。

公开(公告)号：US5586523A

公开(公告)日：1996-12-24

申请号：US531827

申请日：1995-09-21

申请人： Yoshitaka Kawahara ,  Kazunori Kudo ,  Yoshihide Nakatani ,  Hiroyuki Takagawa

发明人： Yoshitaka Kawahara ,  Kazunori Kudo ,  Yoshihide Nakatani ,  Hiroyuki Takagawa

IPC分类号： F02B33/04 ,  F01L9/00 ,  F01L9/02 ,  F01L9/04 ,  F02B25/00 ,  F02B25/04 ,  F02B25/20 ,  F02B33/44 ,  F02B75/02 ,  F02M69/10 ,  F02B29/00

CPC分类号： F01L9/00 ,  F01L9/04 ,  F02B25/00 ,  F02B25/20 ,  F02B2075/025

摘要： The present invention provides a crankcase compression type two-cycle engine which has a comparatively simple construction, is capable of operating at a low fuel consumption and discharges an exhaust gas having a comparatively low hydrocarbon concentration. The engine comprises a crankcase, a piston, a cylinder joined to the crankcase and provided in its lower part with an exhaust port which is opened and closed by the piston, a cylinder head attached to the upper end of the cylinder, and forming a combustion chamber together with the cylinder and the piston. A poppet scavenging valve is provided in the upper part of the cylinder so as to be opened to the combustion chamber side. A diaphragm actuator operates the poppet scavenging valve using the pressure within the crankcase. The diaphragm actuator is provided with a diaphragm that receives the pressure within the crankcase on one side thereof and receives the pressure of a spring on the other side thereof. Further, a passage for introducing the pressure within the crankcase into the diaphragm actuator is connected to a scavenging passage. A fuel supply system may be connected to the scavenging passage to supply the fuel into the scavenging passage.

摘要翻译： 本发明提供一种具有比较简单结构的曲轴箱压缩式双冲程发动机，其能够以低燃料消耗操作并排出具有较低烃浓度的废气。 发动机包括曲轴箱，活塞，连接到曲轴箱并且在其下部设置有由活塞打开和关闭的排气口的气缸，连接到气缸的上端的气缸盖，并形成燃烧 室与气缸和活塞一起。 在气缸的上部设有提升阀清扫阀，以向燃烧室侧开口。 隔膜致动器使用曲轴箱内的压力来操作提升阀扫气阀。 隔膜致动器设置有在其一侧承受曲轴箱内的压力并在其另一侧承受弹簧的压力的隔膜。 此外，用于将曲轴箱内的压力引入隔膜致动器的通道连接到扫气通道。 燃料供给系统可以连接到扫气通道，以将燃料供应到扫气通道中。