초록 ▼

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)

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 secton; (3) Clearance Diameter－must be greater than the shaft oversized step diameter; (4) Lip Interference≥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≥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 ≥100% of X, and lip height≥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.

대표청구항 ▼

An apparatus comprising: (a) a shaft having a first smaller diameter section to be sealed by the below-recited seal and a second larger diameter section over which said seal must pass before contacting said first section; and (b) an annular shaft seal comprising: (i) a mounting portion comprising a

An apparatus comprising: (a) a shaft having a first smaller diameter section to be sealed by the below-recited seal and a second larger diameter section over which said seal must pass before contacting said first section; and (b) an annular shaft seal comprising: (i) a mounting portion comprising a shell and an elastomeric body bonded thereto; (ii) a flex portion of elastomeric material integral with said elastomeric body and extending axially therefrom and being of sufficiently narrow cross-section to permit radial movement of the below-recited sealing lip; and (iii) a sealing lip including an elastomeric backing layer and a polytetrafluoroethylene liner on a radially inner surface of said sealing lip, said elastomeric backing layer being integral with said elastomeric material of said flex portion, said liner being attached to said backing layer, and said seal having the following parameters: (1) Lip Angle=15°-25°; (2) Included Angle－divergent axially away from said flex portion; (3) Clearance Diameter－greater than that of said second shaft section; (4) Lip Interference≥100% of X wherein X is the difference between the diameters of said first and second shaft sections; and (5) Lip Height≥150% of X.