Patent ID: 7950670
Filing Date: 2011-05-31
Classification: F16J

Abstract:
1. A seal assembly comprising: a seal casing including a first axial flange and a first radial flange; a wear sleeve having radial and axial flanges; a seal body supported on said first radial flange, said seal body having air and oil side surfaces meeting along a seal band having contact with the wear sleeve; and plural, circumferentially spaced apart thrust bumpers lying between both of said radial flanges and acting as spacers of enlarged size, each of said thrust bumpers having two opposed radially disposed sides and each of said thrust bumpers having a reduced size, pyramid shaped formation lying on each opposed radially disposed side of said thrust bumpers, and each of said pyramid shaped formations having an apex, and four angularly related planar sides, two adjacent sides tapering radially inwardly and each terminating on an associated thrust bumper, and two opposite sides of said pyramid shaped formation tapering radially outwardly and each terminating on an associated thrust bumper, whereby said apexes of said pyramid shaped formations initially contact said radial flange of said wear sleeve and said radial flange of said seal casing, and both of said formations gradually flatten with wear to become substantially co-planar with said thrust bumper, thereby leaving a predetermined space between said two radial flanges.