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.