Patent ID: 7419166

Claim:
A steering rack boot, comprising: a major-diameter fastener to be fastened to a mating major-diameter member; a first bellows disposed continuously from the major-diameter fastener, the first bellows exhibiting an averaged first axial rigidity; a second bellows disposed continuously from the first bellows; the second bellows exhibiting an averaged second axial rigidity higher than the averaged first axial rigidity; and the second bellows having at least three crests and corresponding roots, a membrane thickness, and a horizontal distance extending from a top of the crest to a bottom of the root of the second bellows; and a difference between the horizontal distance and the membrane thickness of the second bellows being larger than a difference between a corresponding horizontal distance and a membrane thickness of the first bellows and the minor-diameter-side bellows; and a minor-diameter-side bellows disposed continuously from the second bellows, and to be fastened to a mating minor-diameter member, the minor-diameter-side bellows exhibiting an averaged third axial rigidity lower than the averaged second axial rigidity.