Pneumatic tire

Patent metadata

Field	Value
Publication number	US-10759233-B2
Application number	US-201515508682-A
Country	US
Kind code	B2
Filing date	Sep 3, 2015
Priority date	Sep 4, 2014
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

In the tire 2 , fillers 10 are layered over clinches 8 in portions outward of a carcass 14 in the axial direction. A carcass ply 50 is turned up around cores 44 . Turned-up portions 50 a are disposed between the fillers 10 and apexes 46 . Each clinch 8 has a maximum thickness Tcx that is measured along a line normal to an inner surface, in the axial direction, of the clinch 8 . A ratio of a thickness Tf 1 of the filler 10 to a sum of the thickness Tf 1 and the thickness Tcx is greater than or equal to 0.1 and not greater than 0.6. A percentage of a complex elastic modulus E*f of the filler 10 relative to a complex elastic modulus E*a of the apex 46 is greater than or equal to 70% and not greater than 125%.

First claim

The invention claimed is:

1. A pneumatic tire comprising:
a tread;
a pair of sidewalls;
a pair of clinches;
a pair of fillers;
a pair of beads; and
a carcass,

wherein
the sidewalls extend inward from ends of the tread respectively,
the clinches are disposed inward of the sidewalls, respectively, in the radial direction,
the fillers are disposed inward of the clinches, respectively, in an axial direction, and each filler is tapered inward in the radial direction,
the beads are disposed inward of the fillers, 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 fillers are layered over the clinches in portions outward of the carcass in the axial direction,
the beads include cores and apexes that extend outward from the cores, respectively, in the radial direction,
the carcass includes a carcass ply,
the carcass ply is turned up around the cores from an inner side toward an outer side in the axial direction, and, by the turning-up, the carcass ply has a main portion and turned-up portions,
the turned-up portions are disposed between the fillers and the apexes,
each clinch has a maximum thickness Tcx that is measured along a line normal to an inner surface, in the axial direction, of the clinch,
when the normal line for the thickness Tcx is a first reference line,
a ratio of a thickness Tf 1 , of the filler, measured along the first reference line to a sum of the thickness Tf 1 and the thickness Tcx is greater than or equal to 0.1 and not greater than 0.6, and
a percentage of a complex elastic modulus E*f of each filler relative to a complex elastic modulus E*a of each apex is greater than or equal to 70% and not greater than 125%,
a percentage of a complex elastic modulus E*c of the clinch relative to the complex elastic modulus E*f of the filler is greater than or equal to 70% and not greater than 125%, and
a complex elastic modulus E*f of the filler is higher than or equal to 15 MPa and not greater than 75 MPa.

2. The pneumatic tire according to claim 1 , wherein
each filler has a maximum thickness Tfx that is measured along a line normal to the inner surface, in the axial direction, of the clinch, and
when the normal line for the thickness Tfx is a second reference line,
a ratio of a length, in the radial direction, from an inner end of the filler to a point of intersection of the second reference line and the inner surface, in the axial direction, of the clinch, relative to a length, in the radial direction, from the inner end of the filler to a point of intersection of the first reference line and the inner surface, in the axial direction, of the clinch, is greater than or equal to 0.6 and not greater than 1.2.

3. The pneumatic tire according to claim 1 , wherein a thickness, of the tire, measured along the first reference line is greater than or equal to 10 mm and not greater than 20 mm.

4. A pneumatic tire comprising:
a tread;
a pair of sidewalls;
a pair of clinches;
a pair of fillers;
a pair of beads;
a carcass; and
a band,

wherein
the sidewalls extend inward from ends of the tread respectively in a radial direction,
the clinches are disposed inward of the sidewalls, respectively, in the radial direction,
the fillers are disposed inward of the clinches, respectively, in an axial direction,
the beads are disposed inward of the fillers, 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 fillers are layered over the clinches in portions outward of the carcass in the axial direction,
the band is disposed inward of the tread in a portion outward of the carcass in the radial direction,
the beads include cores and apexes that extend outward from the cores, respectively, in the radial direction,
the carcass includes a carcass ply,
the carcass ply is turned up around the cores from an inner side toward an outer side in the axial direction, and, by the turning-up, the carcass ply has a main portion and turned-up portions,
the turned-up portions are disposed between the fillers and the apexes,
a percentage of a complex elastic modulus E*f of each filler relative to a complex elastic modulus E*a of each apex is greater than or equal to 70% and not greater than 125%,
the band is formed by a tape, having a cord formed of organic fiber which extends in a length direction, being helically wound in a circumferential direction, and, on a cross-section obtained by cutting at a plane perpendicular to the circumferential direction of the tire, cross-sections of the tape are aligned in the axial direction,
the tread exists outward of each end of the band, in the axial direction,
gaps are formed between the cross-sections, of the tape, adjacent to each other,
a percentage of a complex elastic modulus E*c of the clinch relative to the complex elastic modulus E*f of the filler is greater than or equal to 70% and not greater than 125%, and
a complex elastic modulus E*f of the filler is higher than or equal to 15 MPa and not greater than 75 MPa.

5. The pneumatic tire according to claim 4 , wherein
a width TW of the tape is greater than or equal to 9 mm and not greater than 15 mm, and
a width TD of each gap is greater than or equal to 3 mm and not greater than 9 mm.

6. The pneumatic tire according to claim 4 , wherein
each clinch has a maximum thickness Tcx that is measured along a line normal to an inner surface, in the axial direction, of the clinch, and
when the normal line for the thickness Tcx is a first reference line,
a ratio of a thickness Tf 1 , of the filler, measured along the first reference line, to a sum of the thickness Tf 1 and the thickness Tcx, is greater than or equal to 0.1 and not greater than 0.6.

7. The pneumatic tire according to claim 4 , wherein
each filler has a maximum thickness Tfx that is measured along a line normal to the inner surface, in the axial direction, of the clinch, and
when the normal line for the thickness Tfx is a second reference line,
a ratio of a length, in the radial direction, from an inner end of the filler to a point of intersection of the second reference line and the inner surface, in the axial direction, of the clinch, relative to a length, in the radial direction, from the inner end of the filler to a point of intersection of the first reference line and the inner surface, in the axial direction, of the clinch, is greater than or equal to 0.6 and not greater than 1.2.

8. The pneumatic tire according to claim 4 , wherein a thickness, of the tire, measured along the first reference line is greater than or equal to 10 mm and not greater than 20 mm.

9. A pneumatic tire comprising:
a tread;
a pair of sidewalls;
a pair of clinches;
a pair of fillers;
a pair of beads; and
a carcass,

wherein
the sidewalls extend inward from ends of the tread respectively in a radial direction,
the clinches are disposed inward of the sidewalls, respectively, in the radial direction,
the fillers are disposed inward of the clinches, respectively, in an axial direction, and each filler is tapered inward in the radial direction, the fillers are layered over the clinches in portions outward of the carcass in the axial direction, and an inner surface, in the axial direction, of each filler is curved so as to project inward,
the beads are disposed inward of the fillers, respectively, in the radial direction, and the beads include cores and apexes that extend outward from the cores, respectively, in the radial direction,
the carcass is extended on and between one

Assignees

• Sumitomo Rubber Ind

Inventors

• Matsumoto Tadao
• Iwata Yasutaka
• Yagyu Kentaro
• Yamashita Fumikazu
• UMEKITA Shingo
• Kuniyasu Yasuaki
• Ninomiya Hiroaki

Classifications

• B29D2030/486

  Additional components for the tyre bead areas, e.g. cushioning elements, chafers, flippers · CPC title

• B29D2030/724

  Stiffening the sidewalls, e.g. by using additional inserts, e.g. made of rubber, plastics or other materials · CPC title

• B60C9/2204

  obtained by circumferentially narrow strip winding · CPC title

• B60C2015/0621

  adjacent to the carcass turnup portion · CPC title

• B60C2015/0625

  provided at the terminal edge portion of a carcass or reinforcing layer · CPC title