Pneumatic tire

Patent metadata

Field	Value
Publication number	US-10479144-B2
Application number	US-201715496870-A
Country	US
Kind code	B2
Filing date	Apr 25, 2017
Priority date	Apr 26, 2016
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A tire 2 includes a pair of beads 12 and a carcass 14 . A core 28 of each bead 12 includes a body 34 having a hexagonal cross-section, and a cover 36 covering the body 34 . The cover 36 is wrapped around the body 34 , and the number of turns the cover 36 is wrapped around the body 34 is greater than or equal to one and smaller than two. The cover 36 includes a plain weave fabric obtained by interlacing warp threads 72 and weft threads 74 . The warp threads 72 and the weft threads 74 intersect. An angle of the intersection is greater than or equal to 45° and not greater than 125°. The warp threads 72 are inclined relative to a carcass cord 70 . An angle of the inclination is greater than or equal to 22.5° and not greater than 67.5°.

First claim

What is claimed is:

1. A pneumatic tire comprising:
a tread;
a pair of sidewalls;
a pair of beads; and
a carcass, wherein
the sidewalls extend almost inward from ends, respectively, of the tread in a radial direction,
the beads are disposed inward of the sidewalls, respectively, in the radial direction,
the carcass is extended on and between one of the beads and the other of the beads along inner sides of the tread and the sidewalls,
the carcass includes a carcass ply,
the carcass ply includes a carcass cord,
each bead includes a core extending in a circumferential direction,
the core includes a body having a hexagonal cross-section, and a cover covering the body,
the cover is wrapped around the body, the number of turns the cover is wrapped around the body being greater than or equal to one and smaller than two,
the cover includes a plain weave fabric obtained by interlacing warp threads and weft threads,
the warp threads and the weft threads intersect, and an angle of the intersection is greater than or equal to 45° and not greater than 125°, and
the warp threads are inclined relative to the carcass cord, and an angle of the inclination is greater than or equal to 22.5° and not greater than 67.5°.

2. The pneumatic tire according to claim 1 , wherein
in the plain weave fabric, a large number of the warp threads are spaced at intervals and a large number of the weft threads are spaced at intervals,
each interval of the warp threads is greater than or equal to 0.5 mm and not greater than 2.0 mm, and
each interval of the weft threads is greater than or equal to 0.5 mm and not greater than 2.0 mm.

3. The pneumatic tire according to claim 1 , wherein
the warp threads each have a strength of greater than or equal to 20 N, and
the weft threads each have a strength of greater than or equal to 20 N.

4. The pneumatic tire according to claim 1 , wherein
the cover has a thickness of greater than or equal to 0.6 mm and not greater than 1.2 mm.

5. The pneumatic tire according to claim 1 , wherein
in the core, one end portion of the cover and another end portion of the cover overlap, and the overlap has a length of greater than or equal to 3 mm and not greater than 15 mm.

6. The pneumatic tire according to claim 1 , wherein
the warp threads each have a fineness of greater than or equal to 300 dtex and not greater than 1670 dtex, and
the weft threads each have a fineness of greater than or equal to 300 dtex and not greater than 1670 dtex.

7. The pneumatic tire according to claim 1 , further comprising a belt disposed inward of the tread in the radial direction, wherein
the belt has an axial width which is greater than or equal to 0.7 times a cross-sectional width of the tire.

Assignees

• Sumitomo Rubber Ind

Inventors

• Tanaka Kaori

Classifications

• B29D2030/485

  the bead cores being made using a band containing a plurality of wires embedded in rubber · CPC title

• B29D30/50

  Covering, e.g. by winding, the separate bead-rings or bead-cores with textile material, e.g. with flipper strips (folding textile layers around bead-rings or bead-cores B29D30/18, B29D30/32; jointly covering bead-rings or bead cores B29D30/34) · CPC title

• B60C2015/044

  characterised by a wrapping layer · CPC title

• B60C15/023 Primary

  the bead being secured by bead extensions which extend over and wrap around the rim flange · CPC title

• B60C15/04 Primary

  Bead cores · CPC title