Patent ID: 7585227
Filing Date: 2009-09-08
Classification: F16D,F16J

Abstract:
1. A joint boot, comprising: a large-diameter attachment part to be attached to an outer peripheral contour of an outer housing, said outer peripheral contour having a plurality of recessed portions in the circumferential direction thereof, a small-diameter attachment part to be attached to a shaft, and a bellows part integrally joining said large-diameter attachment part and said small-diameter attachment part, wherein an external peripheral configuration of said large diameter part is a circular shape, wherein an internal peripheral configuration of said large diameter part bulges radially inwardly at a plurality of circumferential places thereof to form bulging portions; wherein at each of said bulging portions, the large-diameter attachment part comprises: wherein said large diameter part further comprises longitudinal wall portions on a bellows part side of each of said bulging portions, so as to form a plurality of relief holes open in a direction away from said small-diameter part, and wherein a center line of a first lateral strut wall in its thickness direction, a center line of a second lateral strut wall in its thickness direction, and a center line of the central strut wall in its thickness direction intersect at an intersection point, and the intersection point is situated radially outwardly of an outer peripheral face of said large-diameter attachment part.