公开(公告)号：US4771745A

公开(公告)日：1988-09-20

申请号：US41451

申请日：1987-04-23

申请人： Noboru Nakamura ,  Hiroyasu Endo ,  Sadakatu Ushio ,  Tetsuo Ebisudani ,  Mitsunori Ito ,  Tokiichi Mizukami ,  Mitsuru Kishimoto

发明人： Noboru Nakamura ,  Hiroyasu Endo ,  Sadakatu Ushio ,  Tetsuo Ebisudani ,  Mitsunori Ito ,  Tokiichi Mizukami ,  Mitsuru Kishimoto

IPC分类号： F01M9/10 ,  F01M11/02 ,  F01M13/00 ,  F02F7/00 ,  F01M1/00

CPC分类号： F01M9/106 ,  F01M13/00 ,  F01M11/02 ,  F02B2275/20 ,  F02F7/006

摘要： A structure of internal combustion engine comprises a cylinder member composed of a cylinder which accomodates a piston connected with a crankshaft, a crankcase provided to accomodate said crankshaft, a rocker case provided to accomodate a valve actuating mechanism, an oil return passage constituting means for leading oil in said rocker case into said crankcase, and a restraining means for restraining an air flow within said crankcase from entering into said oil return passage constituting means. By the effect of the restraining means provided in relation to the oil return passage constituting means, the air flow generated by the rotation of the crankshaft does not work as a dynamic pressure of hingering the flowingdown of oil.

摘要翻译： 内燃机的结构包括：气缸构件，其由容纳与曲轴连接的活塞的气缸构成，设置成容纳所述曲轴的曲轴箱，设置用于容纳阀致动机构的摇臂壳体，用于引导的回油通道构成装置 所述摇臂壳体内的油进入所述曲轴箱，以及用于限制所述曲轴箱内的空气流进入所述回油通道构成装置的约束装置。 通过相对于回油通道构成装置设置的限制装置的作用，由曲轴的旋转产生的空气流不能作为油的下降的动态压力。