CAJ | 학술논문

为研究方向性微孔对唇形密封润滑特性的影响，建立了遵循质量守恒的JFO空化边界条件的唇形密封润滑理论模型，采用有限单元法求解雷诺控制方程，获得了泵汲率、摩擦力等性能参数，对比分析了椭圆形、矩形、菱形、等腰三角形4种不同形状方向性微孔织构唇形密封的润滑特性。结果表明：微孔结构对称于轴切向时泵汲率为零，而与轴线呈45°倾斜时具有最大泵汲率；微孔结构沿轴切向形成的油楔尺寸最小时，具有最小摩擦力；增加微孔深度将使泵汲率下降，但能减小摩擦力；增大形状因子既可以提高泵汲率，又能减小摩擦力；相同条件下，矩形微孔具有最大泵汲率和最小摩擦力。
위연구방향성미공대진형밀봉윤활특성적영향，건립료준순질량수항적JFO공화변계조건적진형밀봉윤활이론모형，채용유한단원법구해뢰낙공제방정，획득료빙급솔、마찰력등성능삼수，대비분석료타원형、구형、릉형、등요삼각형4충불동형상방향성미공직구진형밀봉적윤활특성。결과표명：미공결구대칭우축절향시빙급솔위령，이여축선정45°경사시구유최대빙급솔；미공결구연축절향형성적유설척촌최소시，구유최소마찰력；증가미공심도장사빙급솔하강，단능감소마찰력；증대형상인자기가이제고빙급솔，우능감소마찰력；상동조건하，구형미공구유최대빙급솔화최소마찰력。
In order to study the effects of shaft surface inclined micropores on lubrication performance of lip seal, a mathematical model of lip seal under steady state was developed based on mass conservation with Jakobsson-Floberg-Olsson (JFO) cavitation boundary condition. The lubrication governing equation was solved by the finite element method, and the non-dimensional reverse pumping rate and friction force were obtained, then a comparative study of lip seal lubrication performance for different shaft surface inclined micropores shapes (ellipse, rectangle, diamond, isosceles triangle) was conducted. Micropores symmetrical with the shaft tangential direction produced zero reverse pumping rate, while others with 45° inclination to the axial direction produced maximum reverse pumping rate. Friction force was minimum when the micropore oil wedge dimension along the tangential direction was minimum. Reverse pumping rate and friction force decreased with micropore depth. Micropores with higher shape factor could produce higher reverse pumping rate and lower friction force. Rectangle micropore produced the maximum reverse pumping rate and minimum friction force among four kinds of micropores under the same conditions.