Shaft seal assembly with exclusion pump dust lip

摘要

A shaft seal assembly including an elastomeric material molded to an annular metal shell is provided. The elastomeric material includes a lip extending from the annular shell to a lip distal end. The lip includes a first lip section projecting toward a center axis, and a second lip section projecting from the first lip section away from the center axis. A dust band is disposed between the first and second lip sections. The elastomeric material also includes flutes disposed on the second lip section and extending helically around the center axis and radially toward the center axis. The dust band can include vents, in which case one of the flutes extends from one side of each vent. The height of the flutes can increase from the dust band to the flute distal end, such that the flutes and the dust band have an equal interior diameter for engaging the shaft.

主权项

1. A dynamic shaft seal assembly, comprising:
an annular shell extending circumferentially around a center axis; an elastomeric material attached to said annular shell and extending circumferentially around said center axis; said elastomeric material including a lip extending from said annular shell to a lip distal end, said lip including a first lip section projecting toward said center axis at an angle relative to a plane extending perpendicular to said center axis and extending to a dust band, said first lip section presenting an interior diameter extending perpendicular to said center axis; said lip including a second lip section projecting from said dust band away from said center axis at an angle relative to the plane extending perpendicular to said center axis, said second lip section presenting an interior diameter extending perpendicular to said center axis; said dust band being disposed between said first lip section and said second lip section and extending circumferentially around said center axis and radially toward said center axis for engaging the shaft; said dust band presenting an interior diameter extending perpendicular to said center axis, said interior diameter of said dust band being less than said interior diameter of said first lip section and less than said interior diameter of said second lip section; said lip including a plurality of flutes disposed on said second lip section and extending radially toward said center axis for engaging the shaft; each of said flutes extending from said dust band helically along said second lip section toward said lip distal end; and, each of said flutes extending from said dust band along said second lip section at an angle of 2 to 45 degrees relative to said dust band to a flute distal end spaced from said lip distal end.