Unlock instant, AI-driven research and patent intelligence for your innovation.

pneumatic tire

A technology of pneumatic tires and tires, which is applied to special tires, tire parts, tire treads/tread patterns, etc., can solve the problems of reduced handling stability, etc., and achieve reduced energy loss, reduced tire quality, and narrow width Effect

Active Publication Date: 2019-06-25
SUMITOMO RUBBER IND LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, as a result of further research by the present inventors, it was found that for the aforementioned narrow-width, large-bead-diameter tires, there is a new problem that needs to be solved in that the steering stability decreases with the reduction of the tire section width.

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • pneumatic tire
  • pneumatic tire
  • pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0058] Embodiments of the present invention will be described in detail below.

[0059] Such as figure 1 As shown, the pneumatic tire 1 according to the present embodiment includes a carcass 6 extending from the tread portion 2 through the sidewall portion 3 to the bead core 5 of the bead portion 4 . In this example, a belt layer 9 further provided with a belt layer 7 arranged radially outside the carcass 6 and inside the tread portion 2 and a belt layer 9 arranged radially outside the belt layer 7 is exemplified. Condition.

[0060]The carcass 6 is formed of one carcass ply 6A in which carcass cords are arranged at an angle of, for example, 75 to 90° with respect to the tire equatorial plane Co. The carcass ply 6A is formed by turning over the bead core 5 from the tire axially inner side to the outer side at both ends of the annular carcass main body portion 6 a spanning between the bead cores 5 and 5 . The carcass return portion 6b. A bead reinforcing bead apex 8 extendi...

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

No PUM Login to View More

Abstract

A pneumatic tire includes a carcass extending between bead cores of bead portions through a tread portion and a pair of sidewall portions. The tire section width Wt (unit: mm) in relation to a bead diameter Db (unit: inch) satisfies the following equations (1) and (2). Wt ‰¤ ˆ’ 0.7257 × Db 2 + 42.763 × Db ˆ’ 339.67 Wt ‰¥ ˆ’ 0.7257 × Db 2 + 48.568 × Db ˆ’ 552.33 The tread portion includes a tread pattern including three rib-shaped land portions separated by two longitudinal grooves, and the land ratio of the tread pattern is not less than 85%.

Description

technical field [0001] The present invention relates to a pneumatic tire capable of exhibiting excellent fuel consumption while ensuring wet grip performance and steering stability. Background technique [0002] Factors affecting the fuel consumption of tires include tire rolling resistance and air resistance. Among them, the main cause of tire rolling resistance is energy loss due to repeated deformation of the tire during running. In order to reduce this rolling resistance, rubber with less energy loss (small tan δ) is used as the tread rubber. [0003] However, when a rubber with a small energy loss is used, although the rolling resistance is reduced, the grip performance (especially the wet grip performance) is lowered, and the abrasion resistance is deteriorated. In addition, as shown in the following Patent Documents 1, 2, etc., research on tread rubber compositions that reduce rolling resistance while improving wear resistance is progressing. However, there is a lim...

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
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B60C3/04B60C11/03
CPCB60C3/04B60C11/0304B60C11/0306B60C11/033B60C2011/0025B60C2011/0388
Inventor 浅野一夫久保田康弘梶田弘明
Owner SUMITOMO RUBBER IND LTD