| 摘要 |
In a joint boot to be mounted on an outer housing having a non-circular outer contour, intended to axial positioning without impairing the mountability to the outer housing. The joint boot ( 10 ) comprises a boot body ( 18 ) including a large-diameter attachment part ( 12 ), a small-diameter attachment part ( 14 ) and a bellows part ( 16 ), and a bushing ( 20 ) interposed between the outer housing and the large-diameter attachment part. The bushing assumes on its outer peripheral surface a circular form in cross-section and is provided, on its inner peripheral part to be externally fitted and fixed to the outer housing, with plural lobe portions ( 26 ) in a circumferentially distributed manner. On the inner peripheral surface of the bushing, protrusions ( 56 ) mating with circumferentially extending grooves ( 54 ) formed on the outer peripheral surface of the outer casing are provided in a position deviating from an external fitting area (Q) by the large-diameter attachment part in the axial direction of the bushing.
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