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公开(公告)号:US5031591A
公开(公告)日:1991-07-16
申请号:US472394
申请日:1990-01-30
申请人: Akihisa Shinoda , Yoshikazu Yamada , Motohiro Fujita , Naoyuki Kamiya , Hirohisa Ishikawa , Ryoji Saiki , Yuichi Tokito , Makoto Yonezawa , Yoji Fujinaga
发明人: Akihisa Shinoda , Yoshikazu Yamada , Motohiro Fujita , Naoyuki Kamiya , Hirohisa Ishikawa , Ryoji Saiki , Yuichi Tokito , Makoto Yonezawa , Yoji Fujinaga
CPC分类号: F02B75/007 , F01L1/02 , F01L1/024 , F01P1/02 , F02B63/02 , F02B75/16 , F01L2001/0535 , F02B2075/027 , F02B2275/20 , F05C2201/021
摘要: An OHC vertical crankshaft engine, comprising: a vertically disposed crankshaft having a first timing pulley at its lower end; a cooling fan attached to an upper end of the crankshaft; a camshaft extending in parallel with the crankshaft at a cylinder head end of the engine and having a second timing pulley at its lower end; and a timing belt passed around the timing pulleys. Thus, the need for lubrication for the transmission mechanism between the crankshaft and the camshaft is substantially eliminated, and the noise generation is reduced. Additionally, since the upper part of the cylinder head is directly exposed to the cooling air produced by a fan provided at an upper end of the crankshaft, a high engine cooling efficiency can be achieved. This effect is even more enhanced if the exhaust port of the engine is disposed above the intake port and extends horizontally and linearly away from the engine.
摘要翻译: 一种OHC立式曲轴发动机,包括:垂直布置的曲轴,其下端具有第一正时皮带轮; 附接到曲轴的上端的冷却风扇; 凸轮轴在发动机的气缸盖端处与曲轴平行地延伸并且在其下端具有第二正时皮带轮; 并且定时皮带绕过定时皮带轮。 因此,基本上消除了对曲轴和凸轮轴之间的传动机构的润滑的需要,并且降低了噪声的产生。 此外,由于气缸盖的上部直接暴露于设置在曲轴的上端的风扇产生的冷却空气,所以能够实现高的发动机冷却效率。 如果发动机的排气口设置在进气口上方并且水平和线性地远离发动机延伸,则这种效果甚至更大。