Test method for wear resistance performance, method of manufacturing tread rubber, method of manufacturing tire, and tire

Patent metadata

Field	Value
Publication number	US-11125652-B2
Application number	US-201916434503-A
Country	US
Kind code	B2
Filing date	Jun 7, 2019
Priority date	Jul 3, 2018
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

A test method of accurately evaluating wear resistance performance of a rubber material when used as a tread rubber of a tire, comprises the steps of: preparing a test piece of the rubber material having a ground contact surface extending in a circumferential direction; abrading the ground contact surface by rolling the test piece on a running surface of a wear testing machine at a slip ratio of not more than 3.5%; and evaluating the wear resistance performance of the test piece by comparing the amount of wear of the test piece with a predetermined threshold value.

First claim

The invention claimed is:

1. A test method of evaluating wear resistance performance of a rubber material when used as a tread rubber of a tire, comprising
a step of preparing a test piece of the rubber material having a ground contact surface extending in a circumferential direction,
a step of abrading the ground contact surface by rolling the test piece on a running surface of a wear testing machine at a slip ratio of not more than 3.5%, and
a step of evaluating the wear resistance performance of the test piece by comparing the amount of wear of the test piece with a predetermined threshold value.

2. The test method according to claim 1 , wherein
the wear testing machine is a Laboratory Abrasion Tester LAT100.

3. The test method according to claim 2 , wherein
in the step of evaluating the wear resistance performance, when the wear amount per unit area (cc/sq·m) of the test piece is less than or equal to a first threshold value which is 3.0×10 −5 ×the slip ratio (%) 1.4 , the wear resistance performance of the test piece is evaluated as being good.

4. The test method according to claim 2 , wherein
in the step of evaluating the wear resistance performance, when the wear amount per unit area (cc/sq·m) of the test piece is less than or equal to a first threshold value which is 2.5×10 −5 ×the slip ratio (%) 1.4 , the wear resistance performance of the test piece is evaluated as being good.

5. The method according to claim 1 , wherein
in the step of abrading the ground contact surface, the contact pressure of the ground contact surface is 0.1 to 1 MPa, the rolling speed is 1 to 50 km/h, and the rolling distance is 10 to 30 km.

6. The test method according to claim 5 , wherein
in the step of evaluating the wear resistance performance, when the wear amount per unit area (cc/sq·m) of the test piece is less than or equal to a first threshold value which is 3.0×10 −5 ×the slip ratio (%) 1.4 , the wear resistance performance of the test piece is evaluated as being good.

7. The test method according to claim 5 , wherein
in the step of evaluating the wear resistance performance, when the wear amount per unit area (cc/sq·m) of the test piece is less than or equal to a first threshold value which is 2.5×10 −5 ×the slip ratio (%) 1.4 , the wear resistance performance of the test piece is evaluated as being good.

8. The test method according to claim 1 , wherein
in the step of evaluating the wear resistance performance, when the wear amount per unit area (cc/sq·m) of the test piece is less than or equal to a first threshold value which is 3.0×10 −5 ×the slip ratio (%) 1.4 , the wear resistance performance of the test piece is evaluated as being good.

9. The test method according to claim 8 , wherein
the step of evaluating the wear resistance performance includes: comparing the wear amount per unit area (cc/sq·m) of the test piece with a second threshold value which is 1.0×10 −6 ×the slip ratio (%) 1.4 .

10. The test method according to claim 8 , wherein
the step of evaluating the wear resistance performance includes: comparing the wear amount per unit area (cc/sq·m) of the test piece with a second threshold value which is 3.0×10 −6 ×the slip ratio (%) 1.4 .

11. A method of manufacturing a tread rubber based on the composition of the rubber material of the test piece whose wear resistance performance is evaluated as being good through the test method according to claim 8 .

12. A method of manufacturing a tire comprises a step of manufacturing a tread rubber based on the composition of the rubber material of the test piece whose wear resistance performance is evaluated as being good through the test method according to claim 8 .

13. The test method according to claim 1 , wherein
in the step of evaluating the wear resistance performance, when the wear amount per unit area (cc/sq·m) of the test piece is less than or equal to a first threshold value which is 2.5×10 −5 ×the slip ratio (%) 1.4 , the wear resistance performance of the test piece is evaluated as being good.

14. The test method according to claim 13 , wherein
the step of evaluating the wear resistance performance includes: comparing the wear amount per unit area (cc/sq·m) of the test piece with a second threshold value which is 1.0×10 −6 ×the slip ratio (%) 1.4 .

15. The test method according to claim 13 , wherein
the step of evaluating the wear resistance performance includes: comparing the wear amount per unit area (cc/sq·m) of the test piece with a second threshold value which is 3.0×10 −6 ×the slip ratio (%) 1.4 .

16. A tire comprising a tread rubber of which wear amount per unit area (cc/sq·m) is less than or equal to a first threshold value which is 3.0×10 −5 ×a slip ratio (%) 1.4 , when a test piece is cut out from the tread rubber and the wear amount per unit area (cc/sq·m) is measured by abrading the test piece on a moving abrasive surface of a wear testing machine at the slip ratio of not more than 3.5%.

Assignees

• Sumitomo Rubber Ind

Inventors

• Nakano Shinya
• Tada Toshio

Classifications

• G01N3/56 Primary

  Investigating resistance to wear or abrasion · CPC title

• B29D2030/0066

  Tyre quality control during manufacturing · CPC title

• G01N2203/0298

  Manufacturing or preparing specimens · CPC title

• G01M17/022 Primary

  the tyre co-operating with rotatable rolls · CPC title

• B29D30/0061

  Accessories, details or auxiliary operations not otherwise provided for · CPC title