Pneumatic tire, mold for tire, and method for manufacturing tire

Patent metadata

Field	Value
Publication number	US-10946702-B2
Application number	US-201816233775-A
Country	US
Kind code	B2
Filing date	Dec 27, 2018
Priority date	Dec 28, 2017
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A rim guard of a tire has a top, an inner surface, and an outer surface. A contour of the inner surface is represented by a circular arc, and the circular arc has a radius of not less than 20 mm and not greater than 30 mm. A contour of the outer surface is represented by a circular arc, and the circular arc has a radius of not less than 100 mm and not greater than 500 mm. In a radial direction, a position of an outer edge of the outer surface coincides with a cross-sectional width specified position, or the outer edge of the outer surface is located outward of the cross-sectional width specified position.

First claim

What is claimed is:

1. A pneumatic tire comprising:
a tread; and
a pair of side portions each located radially inward of an edge of the tread, each side portion including a main body and a rim guard projecting axially outward from an external surface of the main body, wherein
the rim guard has a top, an inner surface located radially inward of the top, and an outer surface located radially outward of the top,
a contour of the inner surface is represented by a circular arc having a center at an outer side of the tire, and the circular arc has a radius of not less than 20 mm and not greater than 30 mm,
a contour of the outer surface is represented by a circular arc having a center at the outer side of the tire, and the circular arc has a radius of not less than 100 mm and not greater than 500 mm, and
in a radial direction, a position of an outer edge of the outer surface coincides with a cross-sectional width specified position, or the outer edge of the outer surface is located outward of the cross-sectional width specified position.

2. The pneumatic tire according to claim 1 , wherein a height in the radial direction from a bead base line to the top is not less than 28 mm and not greater than 35 mm.

3. The pneumatic tire according to claim 2 , wherein a length from the external surface of the main body to the top is not less than 5 mm and not greater than 7 mm.

4. The pneumatic tire according to claim 3 , wherein a ratio of a distance in the radial direction from a bead base line to the outer edge of the outer surface of the rim guard relative to a distance in the radial direction from the bead base line to the cross-sectional width specified position is not less than 1.01 and not greater than 1.3.

5. The pneumatic tire according to claim 3 , wherein
a contour of the external surface of the main body is represented by a plurality of circular arcs including: a lower circular arc that represents a portion at a radially inner side of the cross-sectional width specified position; and an upper circular arc that represents a portion at a radially outer side of the cross-sectional width specified position, and
the upper circular arc is tangent to the lower circular arc at the cross-sectional width specified position.

6. The pneumatic tire according to claim 2 , wherein
a contour of the external surface of the main body is represented by a plurality of circular arcs including: a lower circular arc that represents a portion at a radially inner side of the cross-sectional width specified position; and an upper circular arc that represents a portion at a radially outer side of the cross-sectional width specified position, and
the upper circular arc is tangent to the lower circular arc at the cross-sectional width specified position.

7. The pneumatic tire according to claim 1 , wherein a length from the external surface of the main body to the top is not less than 5 mm and not greater than 7 mm.

8. The pneumatic tire according to claim 7 , wherein a ratio of a distance in the radial direction from a bead base line to the outer edge of the outer surface of the rim guard relative to a distance in the radial direction from the bead base line to the cross-sectional width specified position is not less than 1.01 and not greater than 1.3.

9. The pneumatic tire according to claim 7 , wherein
a contour of the external surface of the main body is represented by a plurality of circular arcs including: a lower circular arc that represents a portion at a radially inner side of the cross-sectional width specified position; and an upper circular arc that represents a portion at a radially outer side of the cross-sectional width specified position, and
the upper circular arc is tangent to the lower circular arc at the cross-sectional width specified position.

10. The pneumatic tire according to claim 1 , wherein a ratio of a distance in the radial direction from a bead base line to the outer edge of the outer surface of the rim guard relative to a distance in the radial direction from the bead base line to the cross-sectional width specified position is not less than 1.01 and not greater than 1.3.

11. The pneumatic tire according to claim 10 , wherein
a contour of the external surface of the main body is represented by a plurality of circular arcs including: a lower circular arc that represents a portion at a radially inner side of the cross-sectional width specified position; and an upper circular arc that represents a portion at a radially outer side of the cross-sectional width specified position, and
the upper circular arc is tangent to the lower circular arc at the cross-sectional width specified position.

12. The pneumatic tire according to claim 2 , wherein a ratio of a distance in the radial direction from a bead base line to the outer edge of the outer surface of the rim guard relative to a distance in the radial direction from the bead base line to the cross-sectional width specified position is not less than 1.01 and not greater than 1.3.

13. The pneumatic tire according to claim 1 , wherein
a contour of the external surface of the main body is represented by a plurality of circular arcs including: a lower circular arc that represents a portion at a radially inner side of the cross-sectional width specified position; and an upper circular arc that represents a portion at a radially outer side of the cross-sectional width specified position, and
the upper circular arc is tangent to the lower circular arc at the cross-sectional width specified position.

14. The pneumatic tire according to claim 1 , wherein
the side portion includes a sidewall located radially inward of the edge of the tread and a clinch located radially inward of the sidewall, and
a boundary between the sidewall and the clinch is included in the rim guard.

15. The pneumatic tire according to claim 14 , wherein an edge of the boundary is located on the inner surface.

16. The pneumatic tire according to claim 1 , wherein the pneumatic tire has an aspect ratio of not less than 25% and not greater than 55%.

Assignees

• Sumitomo Rubber Ind

Inventors

• Sanae Ryuhei
• Kanematsu Yoshiaki
• Tomita Shintaro
• Kudo Daisuke

Classifications

• B60C15/0242

  with bead extensions located radially outside the rim flange position, e.g. rim flange protectors · CPC title

• B60C13/002

  Protection against exterior elements · CPC title

• B29D2030/0612

  Means for forming recesses or protrusions in the tyres, e.g. grooves or ribs, to create the tread or sidewalls patterns · CPC title

• B29D30/0606 Primary

  Vulcanising moulds not integral with vulcanising presses (for solid tyres B29D30/02) · CPC title

• B60C13/003

  characterised by sidewall curvature · CPC title