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A seal for closing a bearing cavity that has a bore and a wear surface at its end includes an elastomeric retaining band that fits snugly against the wall of the bore, an elastomeric seal lip that contacts the wear surface and creates a barrier to the passage of fluid along that surface as the surfa

A seal for closing a bearing cavity that has a bore and a wear surface at its end includes an elastomeric retaining band that fits snugly against the wall of the bore, an elastomeric seal lip that contacts the wear surface and creates a barrier to the passage of fluid along that surface as the surface rotates relative to the seal or vice-versa, and an impervious connecting section that extends between the retaining band and the seal lip. The retaining band contains several axially directed channels that communicate with the bearing cavity and are normally closed and isolated from the ambient atmosphere by flaps which are formed integral with the band and are highly flexible. As a consequence, the flaps will flex when subjected to a slight increase in pressure within the bearing cavity so as to expose the channels to the ambient atmosphere and thereby vent the bearing cavity.

대표청구항 ▼

In an assembly including a shaft, a housing surrounding the shaft and containing a bearing cavity, a bearing located within the bearing cavity for enabling the housing to rotate relative to the shaft or vice-versa, there further being a bore and a wear surface at the end of the bearing cavity with t

In an assembly including a shaft, a housing surrounding the shaft and containing a bearing cavity, a bearing located within the bearing cavity for enabling the housing to rotate relative to the shaft or vice-versa, there further being a bore and a wear surface at the end of the bearing cavity with the wear surface being located generally within the bore, an improved seal for closing the end of the cavity at the bore and wear surface, said seal comprising: a retaining band fitted into snug-fitting contact with the wall of the bore such that it does not rotate relative to the bore and having radially outwardly opening channels which communicate with the bearing cavity and means which normally bear against and contact the wall of the bore to close the channels but will separate from the wall of the bore and open the channels in response to a slight increase in pressure within the bearing cavity so as to expose the channels to the ambient atmosphere, whereby the bearing cavity is vented; a seal lip contacting the wear surface and forming a barrier to the passage of fluid along the wear surface while the wear surface moves relative to the lip or vice-versa; and an impervious intermediate member extending between the retaining band and the lip.