Bearing seal for endless tracks

A sealing arrangement for endless tracks formed of alternating first and second link sides articulated to one another at joints;

• each joint including a bushing affixed to the first link side and a pin surrounded by the bushing and affixed to the second link side;
• a recess provided in the second link side and defined by a radial base and an inner axial wall of the second link side;
• the pin extending medially through the recess and the bushing extending, with an outer terminal axial surface portion and a radial face, into the cylindrical recess beyond a radial face of the first link side;
• the sealing arrangement including a resilient sealing ring received in the recess and surrounding the pin;
• the sealing ring having a first radial side oriented towards the radial edge face of the bushing, a second, opposite radial side oriented towards the radial base of the second link side, an inner axial side oriented towards the pin and an outer axial side oriented towards the inner axial wall of the second link side;
• the sealing ring being axially compressed by the radial edge face of the bushing and the radial base of the recess, whereby the first radial side of the sealing ring is in engagement with the radial edge face of the bushing and the second radial side of the sealing ring is in engagement with the radial base of the second link side;
• the improvement wherein said first radial side of said sealing ring has a first sealing face pressed into engagement with said radial edge of said bushing and a second sealing face pressed into engagement with said radial edge of said bushing;
• said first sealing face being radially spaced from said second sealing face;
• said first and second sealing faces define, with said radial edge face of said bushing, a first sealed chamber;
• said second radial side of said sealing ring having a third sealing face pressed into engagement with said radial base of said second link side and a fourth sealing face pressed into engagement with said radial base of said second link side;
• said third sealing face being radially spaced from said fourth sealing face;
• said third and fourth sealing faces define, with said radial base of said second link side, a second sealed chamber;
• said sealing ring further having a peripheral collar oriented towards said radial face of said first link side;
• said collar having a free end an outer axial face constituting said outer axial side of said sealing ring;
• said axial face of said collar being pressed into engagement with said inner axial wall of said second link side and said free end of said collar being pressed into engagement with said radial face of said first link side and said outer terminal surface portion of said bushing.