Elastomeric seal anti-extrusion wedge backup ring and flange

摘要

A seal assembly (100) for a shaft (102) has a flange (104) fixed to a work piece (106) having a bore hole (108) therein. The flange (104) encircles the shaft (102) and includes a triangular shaped projecting member (110) having first (112) and second (116) surfaces extending from the flange (104) into the bore hole (108). An angle is formed between the first (112) and second (116) surface. The first surface (112) of the projecting member (110) is in contact with an inner surface (114) of the bore hole (108) or the outer surface of the shaft (102). An o-ring (136) encircles the shaft (102) and a backup ring (122) is positioned within a space between the shaft (102), the flange (104) and the o-ring (136) or between the bore hole (108), the flange (104) and the o-ring (136). Subject to axial forces, the backup ring (122) undergoes a wedging action between the shaft (104) and the triangular shaped projecting member (110) or between the bore hole (108) and the triangular member (110) to seal where the shaft (102) penetrates the work piece (106). <IMAGE>