Patent ID: 7334942

Claim:
A dual seal assembly for a bearing, the assembly comprising: a first seal frame coupled to a tip end of an opening in a space formed between an inner ring and an outer ring of the bearing and press-fitted to said outer ring; a second seal frame press-fitted to the inner ring and a main seal member fitted to at least one of said first seal frame and said second seal frame for sealing a space formed between said first seal frame and said second seal frame; a third seal frame interposed between said first seal frame and said second frame, and press-fitted to one of said first and second seal frames; and an auxiliary seal member inserted into said third seal frame to seal a gap formed between said first and said second seal frames; wherein said first seal frame comprises: a first horizontal flange firmly inserted into an inner surface of said outer ring; and a first vertical flange vertically bent from an inner axial tip end of said first horizontal flange toward an inner radial direction; said second seal frame comprises: a second horizontal flange firmly inserted into an outer surface of said inner ring; and a second vertical flange vertically bent from an outer axial tip end of said second horizontal flange toward an outer radial direction, and axially inclined and vertically bent toward a radial outer direction; and said third seal frame comprises: a third horizontal flange firmly press-fitted to an inner surface of said first horizontal flange; and a third vertical flange vertically bent from an outer axial tip end of said third horizontal flange toward an inner radial direction, wherein a first prescribed gap is formed between an inner surface of said first vertical flange and an upper inner surface of said second vertical flange and functions as a first labyrinth, a second prescribed gap is formed between an inner surface of said third horizontal flange and an upper end of said second vertical flange and functions as a second labyrinth, and said auxiliary seal member is inserted into a lower end of said third vertical flange and a lip member thereof is firmly abutted to an outer surface of said second vertical flange for sealing.