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Skeleton oil seal layout and sealing principle
Source: China Bearing Network Time: 2018-06-13
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Skeleton oil seal is relatively simple; generally there are three components: oil seal body, reinforcing skeleton and self-tightening spiral spring. Seal body is divided into bottom, waist, cutting edge and sealing lip according to different parts. Generally; skeleton in free condition Oil seal; its inner diameter is larger than the shaft diameter. Therefore, after the oil is packed into the oil seal seat and the shaft; the pressure of the oil seal edge and the shortening force of the self-tightening spiral spring have a certain diameter on the shaft. Tightening force; after working for a period of time; the pressure will be agilely reduced or even disappeared; thus; plus the spring can compensate the oil seal self-tightening force at any time.
Sealing principle:
Because there is an oil film operated by the oil seal edge between the oil seal and the shaft; the oil film has fluid smoothness. Under the effect of liquid surface tension; the stiffness of the oil film just makes the oil film and the air touch end form a crescent; avoiding the operation The leakage of the medium; then the sealing of the rotating shaft. The sealing of the oil seal; the thickness of the oil film on the sealing surface; the thickness is too large; the oil seal leaks, the thickness is too much. 赡芊(5) 赡Σ 鹩 鹩 夂 夂胫嶂涿 胫嶂涿 æ¹ãƒ æ¹ãƒ æ¹ãƒ 蛞滓鸱 蛞滓鸱 蛞滓鸱 4 4 4 4 4 4 4 4
Therefore; in the device; must apply some oil on the seal; together to ensure that the skeleton oil seal and the shaft line straight; if not straight; the oil seal lip will drain the smooth oil from the shaft; it will also lead to excessive seal lips Wear and tear; in the work; the smoothing agent in the shell gently oozes a little; the most ambition to reach the oil film at the sealing surface.
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