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为防止曲轴前后端沿轴颈表面漏油,在曲轴的前后端轴颈处装有密封设施,反油螺纹装置就属于其中的一种。反油螺纹的牙型,一般是矩形或梯形,螺纹有单头、双头和三头之分。螺纹的旋向与曲轴的转向相反。反油螺纹的外径和机体之间的径向间隙一般为0.25～0.30mm。一、反油螺纹的封油原理反油螺纹的封油作用是这样实现的,由于发动机所用的润滑油都具有一定的粘性,因此,处于曲轴和机体之间的润滑油,因机体表面的附着作用,当曲轴旋转时,就使润滑油与曲轴表面产生速度差,油层被迫象螺母一样沿轴向移动,借反油螺纹对间隙中的润滑油产生的轴
In order to prevent the front and rear crankshaft oil leakage along the surface of the journal, crankshaft front and rear journal equipped with sealing facilities, oil repellent device is one of them. Anti-oil thread of the tooth, usually rectangular or trapezoidal, with a single thread, double head and three points. The direction of rotation of the thread is opposite to that of the crankshaft. Anti-oil thread diameter and the radial clearance between the body is generally 0.25 ~ 0.30mm. First, the anti-oil thread sealing principle Anti-oil thread sealing effect is achieved, because the engine used in lubricating oil has a certain viscosity, therefore, between the crankshaft and the body of the lubricating oil, due to body surface adhesion Role, when the crankshaft rotation, make the surface of the oil and crankshaft speed difference, the oil layer was forced to move in the same axial direction as the nut, by the oil thread on the gap in the oil generated by the shaft