Method for arranging stud pins in pneumatic tire

Patent metadata

Field	Value
Publication number	US-11021020-B2
Application number	US-201816167798-A
Country	US
Kind code	B2
Filing date	Oct 23, 2018
Priority date	Nov 8, 2017
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

A method for arranging stud pins in a pneumatic tire is a method for arranging stud pins in a tread portion at intervals in a tire width direction so as to form a plurality of rows. This method includes specifying an inner region, an intermediate region, and an outer region by virtually partitioning the tread portion into equal three parts from a center line extending in a tire circumferential direction to a ground contact end in the tire width direction outward. The method also includes arranging the stud pins such that among numbers of stud pins per row in the inner region, the intermediate region, and the outer region, the number in the outer region is the largest, the number in the intermediate region is the second largest, the number in intermediate region is the smallest.

First claim

What is claimed is:

1. A method for arranging stud pins in a tread portion at intervals in a tire width direction so as to form a plurality of rows, the method comprising:
specifying an inner region, an intermediate region, and an outer region by virtually partitioning the tread portion into equal three parts from a center line extending in a tire circumferential direction to a ground contact end in the tire width direction outward, the equal three parts each having plural stud-pin rows extending in the tire circumferential direction; and
arranging the stud pins such that among average numbers of stud pins per stud-pin row in the inner region, the intermediate region and the outer region, the number in the outer region is the largest, the number in the intermediate region is the second largest, and the number in the inner region is the smallest.

2. The method according to claim 1 , wherein the number of the stud pins in an outermost stud-pin row in the tire width direction is maximized.

3. The method according to claim 1 , wherein
the stud pins are arranged in the plural stud-pin rows at equal intervals in the tire width direction, and
each of the equal intervals has a distance of 4.5 mm to 9 mm.

4. The method according to claim 1 , wherein when the tread portion has a ground contact width of 140 mm to 260 mm, the number of stud-pin rows of the stud pins is 28.

5. The method according to claim 2 , wherein
the stud pins are arranged in the plural stud-pin rows at equal intervals in the tire width direction at equal intervals in the tire width direction, and
each of the equal intervals has a distance of 4.5 mm to 9 mm.

6. The method according to claim 2 , wherein when the tread portion has a ground contact width of 140 mm to 260 mm, the number of stud-pin rows of the stud pins is 28.

7. The method according to claim 3 , wherein when the tread portion has a ground contact width of 140 mm to 260 mm, the number of stud-pin rows of the stud pins is 28.

8. The method according to claim 5 , wherein when the tread portion has a ground contact width of 140 mm to 260 mm, the number of stud-pin rows of the stud pins is 28.

9. The method according to claim 1 , wherein the arranging the stud pins is performed with reference to a graph of an upper mold and a graph of lower mold, the graphs each showing a number of the stud pins for each of the stud-pin rows in the equal three parts.

Assignees

• Toyo Tire & Rubber Co
• Toyo Tire Corp

Inventors

• Yasunaga Toshikazu

Classifications

• B29D30/66 Primary

  Moulding treads on to tyre casings, e.g. non-skid treads with spikes · CPC title

• B60C2011/0374

  Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane · CPC title

• B60C11/1625 Primary

  Arrangements thereof in the tread patterns, e.g. irregular · CPC title

• B29D2030/662

  Treads with antiskid properties, i.e. with spikes · CPC title

• B60C11/0302

  directional pattern, i.e. with main rolling direction · CPC title