Self-retaining lip seal

A seal for sealing between a shaft and an outer member, the shaft being rotatable about a central axis and the outer member having a gland defined by an inner circumferential surface and at least one radial surface, the seal comprising:

• an annular body sized to be disposable within the gland and formed of a flexible material, the annular body having a main body portion, a sealing lip extending radially inwardly from the main body portion and configured to sealingly engage with the shaft and a retainer lip extending radially-outwardly from the main body portion and configured to engage with the inner circumferential surface of the outer member so as to retain the annular body within the gland;
• wherein the seal main body portion has opposing first and second axial ends, the first axial end being disposed against the gland radial surface, the seal further including a shoulder extending radially inwardly from the inner circumferential surface of the main body portion and disposed axially between the sealing lip and the first axial end, the shoulder having an inner radial end configured to be disposed proximal to and spaced radially outwardly from the shaft.

A seal for sealing between a shaft and an outer member, the outer member being rotatable about a central axis extending through the shaft and having a bore, the shaft being disposed within the outer member bore and having an outer circumferential surface and a gland defined by two facing radial surfaces and a circumferential surface spaced radially inwardly from the outer circumferential surface, the seal comprising:

• an annular body sized to be disposable within the gland and formed of a flexible material, the annular body having a main body portion with an inner radial end and an outer radial end, a primary sealing lip extending radially outwardly from the outer radial end of the main body portion such that an annular gap is defined radially between the primary sealing lip and the outer radial end of the main body portion and configured to sealingly engage with the outer member and a secondary sealing lip extending radially inwardly from the inner radial end of the main body portion such that an annular gap is defined radially between the secondary sealing lip and the inner radial end of the main body portion and configured to engage with the circumferential surface of the gland.