US 2006/0079337 A1Published application

Joint boot

AssigneeToyo Tire & Rubber Co., Ltd.

InventorsTakenori Ohshita, Eiichi Imazu

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Abstract

A joint boot, wherein sealing performance of a large-diameter attachment part to an outer casing is enhanced, includes a larger-diameter attachment part 2, a small-diameter attachment part 4 and a bellows part 5. The large-diameter attachment part 2 is provided on its inner periphery with plural convex portions 7 and constructed to be capable of externally fitting in plural recessed portions 8 formed on the outer periphery of the outer casting 1. The large-diameter attachment part 2 and the bellows part are formed in separate bodies, and a fit cylinder part 6 is extended at one extremity of the bellows part 5. The convex portions 7 include each an inner wall portion 12 jutting radially inwardly in a curved form, an outer wall portion 11 in an arc form constituting part of the outer periphery surface of the large-diameter attachment part, a central strut wall 13A connecting both in the circumferential middles of both, and a pair of lateral strut walls 13B, 13B connecting the inner and outer wall portions on both sides of the central strut wall, thereby forming four relief holes 21A, 22A, 23A, 24A, circumferentially juxtaposed on the convex portions.

Claims13

Dependent claims

A joint boot comprising a cylindrical large-diameter attachment part to be installed by external fitting to a mounting part of an outer casing, a small-diameter attachment part to be installed on a shaft, and a bellows part linking both, the large-diameter attachment part assuming on its outer peripheral surface a circular form in cross-section and being in its inner periphery area provided with a plurality of convex portions protruding radially inwardly so as to be distributed in the circumferential direction, the plural convex portions being constructed so that they can be externally fitted respectively in a plurality of recessed portions formed on the mounting part of the outer casing,

wherein the large-diameter attachment part is formed in a separate body from the bellows part, and a fit cylinder part externally fitting on the large-diameter attachment part is extended at one extremity of the bellows part;
each of the convex portions of the large-diameter attachment part comprises an inner wall portion radially inwardly jutting in a curved form and adapted to fit in each of the said recessed portions, an outer wall portion of an arc form constituting part of the outer peripheral surface of the large-diameter attachment part, a central strut wall connecting the inner wall portion and the outer wall portion in the circumferential middles of both and extending radially, and a pair of lateral strut walls linking the inner wall portion and the outer wall portion on both sides of the central strut wall, whereby four relief holes are provided on the convex portion so as to be juxtaposed in the circumferential direction.

A joint boot comprising a cylindrical large-diameter attachment part to be installed by external fitting to a mounting part of an outer casing, a small-diameter attachment part to be installed to a shaft, and a bellows part linking both, the large-diameter attachment part assuming, on its outer peripheral surface, a circular form in cross-section and being on its inner periphery area provided with a plurality of convex portions protruding radially inwardly so as to be distributed in the circumferential direction, a plurality of the convex portions being constructed so that they can be externally fitted respectively in a plurality of recessed portions formed on the mounting part of the outer casing,

wherein the bellows part is formed of resin material and the large-diameter attachment part is formed in a discrete body from the bellows part and of a softer resin material than the bellows part or rubber material;
a fit cylinder part externally fitting on the large-diameter attachment part is extended at one extremity of the bellows part;
the large-diameter attachment part is provided over the entirety of its inner periphery surface with a faying inner periphery portion smaller in diameter than the mounting part of the outer casing so that the large-diameter attachment part can be fayed and externally fitted to the mounting part;
and the one end of the large-diameter attachment part opposite to the bellows part is provided over the entirety of the inner periphery surface with an upset inner periphery portion assuming a straight hole larger in diameter than the mounting part and guiding the mounting part when externally fitting the large-diameter attachment part on the mounting part, the upset inner periphery portion being terminated not to extend in the axial direction of the large-diameter attachment part up to an external fitting area by the fit cylinder part.

1 more element

Dependencies are inferred from the claim text.