| 摘要 |
<p>A shaft seal with a polytetrafluoroethylene-lined lip having the following dimensional criteria thus providing sufficient retraction to effect positive sealing against a smaller diameter shaft section after installation and stretching over a larger diameter shaft section: (1) Lip Angle = 15 -25 ; (2) Included Angle - must be divergent axially from the flex section; (3) Clearance Diameter - must be greater than the shaft oversized step diameter; (4) Lip Interference (Alpha) 125% of X (X is the difference between the diameters of the oversized shaft section and the diameter of the section to be sealed); and (5) Lip Height (Alpha) 175% of X. The above parameters are for seals to be used on shafts where there will be runout and/ or angular shaft displacement. When there is no runout or angular shaft displacement, the seal parameters are identical to those listed above except that lip interference (Alpha) 100% of X, and lip height (Alpha) 150% of X. The present invention also includes the method of installation of such seal and the combination of such seal and the shaft on which it is installed. </p> |
