Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1987-11-23
1989-04-11
Footland, Lenard A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277133, 277134, F02F 1100
Patent
active
048199494
ABSTRACT:
A seal assembly for closing the end of a bearing includes a seal and a shield on which the seal is captured. The shield has an axially directed mounting portion, an axially directed overhang and a radial end wall between the mounting portion and overhang. The seal has a pumping labyrinth presented toward the mounting portion, yet spaced from it, a dirt lip directed obliquely toward and contacting the mounting portion, and a secondary lip directed obliquely toward, yet normally spaced from, the overhang, with the dirt lip being between the labyrinth and the secondary lip. The labyrinth is exposed toward the interior of the bearing and has pumping cavities which impel lubricant back into the bearing. Between the dirt and secondary lip is a groove which opens toward the radial wall of the shield, and this groove contains a ring of grease-type lubricant which extends to and adheres against the radial wall, thus forming a barrier to the ingress of contaminants. The ring of lubricant may become temporarily pressurized, in which event it will deflect the secondary lip against the overhang of the shield to prevent excessive leakage, yet the pressure will be relieved through vent notches in the contacting edge of the lip.
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Boeschenstein Edward A.
Footland Lenard A.
Timken Company
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