Pneumatic tire and production method therefor
a technology of pneumatic tires and production methods, which is applied in the field of pneumatic tires, can solve the problems of radio interference, poor conductivity of silicone rubber, and increased electric resistance of tread rubber, and achieve the effects of improving the uniformity of tires, enhancing the forming precision of tread rubber, and low rolling resistan
Inactive Publication Date: 2010-10-14
SUMITOMO RUBBER IND LTD
View PDF14 Cites 17 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0016]In the pneumatic tire according to the first invention, the base portion of the tread rubber extends continuously without being divided into right and left parts in the tire axial direction. Further, the conductive portion extends radially inwardly from the ground contact surface through between the first cap portion and the second cap portion and further extends in the tire axial direction through between the base portion and one of the first cap portion and the second cap portion, and it is connected to the sidewall rubber or the topping rubber. Therefore, such a pneumatic tire can discharge static electricity accumulated in a vehicle to a road surface through the conductive portion. Further, since the base portion is continuous in the tire axial direction, forming precision of the tread rubber is enhanced and uniformity of the tire is also improved.
Problems solved by technology
However, since silica has a poor conductivity, electric resistance of the tread rubber is increased.
Such a tire tends to accumulate static electricity in a vehicle and to cause radio interference such as a radio noise.
In such a tread rubber (a), an effect for reducing the rolling resistance of the tire cannot be expected sufficiently.
This may deteriorate uniformity of the tire.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
examples
First Invention
[0159]Pneumatic tires (size: 215 / 45R17) having a base structure shown in Table 1 were manufactured, and electric resistance and uniformity of each tire were measured. In each Example, a silica-rich non-conductive rubber was used for the cap portion and the base portion, and a carbon-rich conductive rubber was used for the conductive portion (through-terminal portion). Formulations of these rubbers are common to all Examples. Everything is common to all tires, except parameters shown in Table 1.
[0160]In Comparative Example 2, a tread rubber having no through-terminal portion (d) was used, as shown in FIG. 26. Therefore, the cap portion and the base portion are not divided into two parts. Comparative Example 3 has a base structure shown in FIG. 25, but the cap portion and the base portion are formed of strip laminated bodies. The winding manner of the rubber strip is the same in both the Comparative Examples and the Examples. The test methods are as follows:
[0161]The el...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
Static electricity in a vehicle is discharged to a road surface without deteriorating uniformity. Tread rubber 2G includes base portion 9 made of a non-conductive rubber which is disposed radially inward and extends continuously from one tread edge e1 side to the other tread edge e2 side, cap portion 10 made of a non-conductive rubber and disposed radially outward of the base portion 9 to form ground-contacting surface 2a, and conductive portion 11 made of a conductive rubber and having one end exposed on the ground-contacting surface 2a and the other end connected to sidewall rubber 3G electrically conductive with a rim when the tire is mounted on the rim. The cap portion 10 are divided into right and left and includes first cap portion 10A and second cap portion 10B. The conductive portion 11 extends radially inwardly from the ground-contacting surface 2a between the first cap portion 10A and the second cap portion 10B and further extends axially between the base portion 9 and one of the first and second cap portions 10A and 10B to connect to the sidewall rubber 3G.
Description
TECHNICAL FIELD[0001]The present invention relates to a pneumatic tire being capable of discharging static electricity in a vehicle to a road surface, and to a method for manufacturing the same.BACKGROUND ART[0002]In recent years, a large amount of silica is incorporated in a tread rubber of a pneumatic tire. Silica has a merit that it reduces rolling resistance and enhances wet grip performance of the tire. However, since silica has a poor conductivity, electric resistance of the tread rubber is increased. Such a tire tends to accumulate static electricity in a vehicle and to cause radio interference such as a radio noise.[0003]In order to prevent the accumulation of static electricity in a vehicle, for example, a tread rubber (a) as shown in FIG. 25 is proposed. The tread rubber (a) has a double layer structure including a base portion (c) located on a radially inner side and a cap portion (b) disposed radially outward of the base portion. To enhance a driving performance and the ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): B60C11/00B29D30/16
CPCB29D30/3028B29D30/60B29D30/68B29D2030/526B60C11/005B60C19/08B29D30/0681B60C11/0058B60C11/00Y02T10/86B60C2011/0091B60C19/082B60C11/0075
Inventor KUROKI, TAKESHI
Owner SUMITOMO RUBBER IND LTD