Sealing boot for universal joint assembly

A sealing boot made of elastic material for a universal joint assembly which includes an outer joint member and a shaft member adapted to be operatively associated with an inner joint member of said joint assembly, said sealing boot comprising:

• a first larger diameter end portion connected in tight sealed engagement with said outer joint member and a second end portion having a relatively smaller diameter than said first end portion connected in tight sealed engagement to said shaft member;
• a bellows portion extending between said first end portion and said second end portion to sealingly enclose said joint assembly;
• said first larger diameter end portion comprising
• a radially extending sealing face which is adapted to engage an end face of said outer joint member, and
• an axially extending cylindrical portion adapted to fit over said outer joint member in order to cooperate with said radially extending sealing face to secure said boot to said outer joint member;
• and
• a plurality of ribs arranged on the outside of said sealing boot at said first larger diameter end portion in the vicinity of said axially extending cylindrical portion and said radially extending sealing face;
• said ribs being circumferentially spaced about the outer circumference of said sealing boot and to extend radially outwardly substantially parallel to the axis of rotation of said outer joint member;
• said ribs acting in the manner of air guide veins and having an elasticity such that they deform together with said bellows portion when said joint is articulated beyond a particular angle of articulation.