公开(公告)号：US20040206312A1

公开(公告)日：2004-10-21

申请号：US10828294

申请日：2004-04-21

Applicant: KIORITZ CORPORATION

Inventor： Yumin Liu ,  Yukio Sawadate ,  Masahiko Iizuka ,  Yoshiaki Nagao

IPC: F01P001/02 ,  F02F001/34

CPC classification number: F02B75/16 ,  F01M2011/0025 ,  F01P1/02 ,  F01P1/06 ,  F01P5/06 ,  F02B63/02 ,  F02B2075/027 ,  F02F1/04

Abstract: The present invention provides an air-cooled four-stroke internal combustion engine capable of achieving a high degree of cooling. The present invention is directed to an air-cooled four-stroke internal combustion engine including a crankshaft and a fan rotor rotatably driven by the crankshaft to generate cooling air for cooling the engine. The engine comprises an oil pan disposed below the crankshaft. A space formed below the oil pan extends in the axial direction of the crankshaft along the lower surface of the oil pan and allows a cooling air to pass therethrough. An upstream portion of the lower surface is inclined upward, toward the upstream, in a vertical section taken along the axis of the crankshaft to receive the cooling air therein.

Abstract translation: 本发明提供一种能够实现高冷却度的风冷四冲程内燃机。 本发明涉及一种风冷四冲程内燃机，其包括曲轴和由曲轴可旋转地驱动的风扇转子，以产生用于冷却发动机的冷却空气。 发动机包括设置在曲轴下方的油盘。 油盘下面形成的空间沿着油盘的下表面在曲轴的轴向方向上延伸，并允许冷却空气通过。 下表面的上游部分在沿着曲轴的轴线截取的垂直截面中朝向上游向上倾斜，以在其中接收冷却空气。