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1. 发明授权

US06415748B2 Exhaust control system in two-cycle internal combustion engine 失效
标题翻译：双循环内燃机排气控制系统
公开(公告)号：US06415748B2
公开(公告)日：2002-07-09
申请号：US09874120
申请日：2001-06-06
申请人： Hiroyuki Uchida , Shigeyuki Hara , Masaharu Ugai , Yasuo Sasamura
发明人： Hiroyuki Uchida , Shigeyuki Hara , Masaharu Ugai , Yasuo Sasamura
IPC分类号： F02B2520
CPC分类号： F02D13/0284 , F02B2075/025 , Y02T10/18
摘要： It is intended to provide an exhaust control system in a two-cycle internal combustion engine capable of suppressing the occurrence of irregular combustion when an opening timing of an exhaust port is set to a maximum delay timing, thereby improving the combustion stability and affording a high engine output when the opening timing of the exhaust port is set to a maximum advance timing. In the exhaust control system, an exhaust control valve has valve elements movable between their maximum projected positions at which a maximum delay timing of the exhaust ports is set and their maximum retracted positions at which a maximum advance timing of the exhaust ports is set. The valve elements are provided with control surfaces, that face a cylinder bore at the maximum projected positions of the valve elements to close upper port portions of the exhaust ports. Lower edges of the control surfaces are formed in a shape that substantially coincides with the shape of upper edges of the exhaust ports at the retracted positions of the valve elements. A pair of communication passages are formed in the valve elements, respectively, having first end portions, at the maximum projected positions of the valve elements, open to lower control surface portions positioned lower than top portions of the lower edges, and second, opposite end portions which are directly open to the exhaust passage.
摘要翻译：本发明的目的是在排气口的打开正时被设定为最大延迟定时的情况下，提供能够抑制不规则燃烧的发生的双循环内燃机中的排气控制系统，从而提高燃烧稳定性并提供高当排气口的打开定时被设定为最大提前定时时，发动机输出。在排气控制系统中，排气控制阀具有可在排气口的最大延迟定时被设定的最大突出位置和设定排气口的最大前进定时的最大缩回位置之间移动的阀元件。阀元件设置有控制表面，其在阀元件的最大突出位置处面对气缸孔以封闭排气口的上端口部分。控制表面的下边缘形成为与阀元件的缩回位置处的排气口的上边缘的形状基本一致的形状。在阀元件中分别形成有一对连通通道，其具有在阀元件的最大突出位置处的第一端部开放到位于比下边缘的顶部低的下部控制表面部分，并且第二相对端直接通向排气通道的部分。

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