Low rolling resistance tyre for vehicles

A low rolling resistance, tire technology, applied in the direction of rolling resistance optimization, special tires, tire parts, etc., can solve the problems of high rolling resistance and high hysteresis value, and achieve the effect of low rolling resistance

Inactive Publication Date: 2006-02-01
PIRELLI TYRE SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, applicants have found that tires made according to this Canadian pat...

Method used

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  • Low rolling resistance tyre for vehicles
  • Low rolling resistance tyre for vehicles
  • Low rolling resistance tyre for vehicles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] (invention)

[0119] A. Preparation of tire tread radial outer layer

[0120] A rubber composition having the composition in Table I (parts in phr) was prepared by two-stage mixing at a fill factor of 70% using a known rotary mixer (such as a Banbury mixer) at In the first step, all ingredients except the vulcanization system were charged into a rotary mixer and mixed for 4 minutes at approximately 40 rpm.

[0121] When mixing, the mechanical work transferred to the mixture is controlled to keep the temperature inside the mixture at 150-155°C.

[0122] In the second step, when the rubber composition is cooled to 23°C, the vulcanization system is mixed with other ingredients in a rotary mixer at a speed of 20rpm for 4 minutes, and the temperature of the mixture is carefully kept at about 100°C to prevent overvulcanization. start early.

[0123] The following ingredients are used:

[0124] -S-SBR-A = end-capped and coupled butadiene-styrene copolymer, prepared in a so...

Embodiment 2

[0145] (invention)

[0146] According to the method described in Example 1, the rubber composition with the composition in Table I was prepared.

[0147] In addition to the ingredients used in the rubber composition of the radial inner layer described in Example 1, the following ingredients were used:

[0148] - Kevlar(R) size = short fibrillated aramid fibers dispersed in a natural rubber polymeric matrix (weight percent of fibers = 23%).

Embodiment 7-8

[0156] (comparative example)

[0157]According to the method described in US Pat. No. 4,319,619, two kinds of rubber compositions were prepared for the radial inner layer of the tire tread in comparison with Example 1 and Example 3 in the patent.

[0158] In addition to the components used in the rubber composition of the radial inner layer described in Example 1, the following ingredients were used:

[0159] -E-SBR1500=The commercial name on the market is EUROPRENE TM 1500 (Enichem Corporation) emulsion-based butadiene styrene copolymer.

[0160] The composition of this rubber composition is reported in Table II.

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Abstract

A low rolling resistance tire (1) for vehicles is described which comprises at least one belt layer (7) coaxially extending around at least one carcass ply (3), a composite tread (10) coaxially extending around the belt layer (7) and comprising a radially outer layer (12) an a radially inner layer (11), wherein the ratio between the modulus of elasticity E' at 70 DEG C of the radially inner layer (11) and the modulus of elasticity E' at 70 DEG C of the radially outer layer (12) is comprised between 1.1 and 3, and the ratio between the value of tang delta at 70 DEG C of the radially inner layer (11) and the value of tang delta at 70 DEG C of the radially outer layer (12) is lower than 0.8. Advantageously, the tire (1) achieves a better compromise between the characteristics of rolling resistance, handling and comfort with respect to what is obtainable from known tires for the same type of use.

Description

technical field [0001] In general, the present invention relates to vehicle tires with low rolling resistance treads. [0002] In particular, the invention relates to a vehicle tire comprising at least one belt ply coaxially surrounding at least one carcass ply, a composite tread coaxially surrounding the belt ply, It also includes a radial outer layer suitable for contacting the ground and a radial inner layer located between the radial outer layer and the belt layer. Background technique [0003] In the field of tire manufacturing, the main purpose of an increasing part of research is to find the sweet spot between two aspects, on the one hand, the rolling resistance of the tire - which should be reduced to a minimum, and on the other hand, the handling and comfort of the tire characteristic. [0004] This object is difficult to achieve for a vehicle tire with a tread of composite form, for example for a tread comprising a radially outer layer and a radially inner layer ...

Claims

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Application Information

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IPC IPC(8): B60C9/18B60C11/00B60C1/00B29D30/06B29D30/52B29D30/56B60C9/04B60C11/18
CPCB60C11/005B60C11/00B60C11/18B60C1/0016Y02T10/86B60C9/04
Inventor A·阿玛迪欧M·艾索拉A·塞拉
Owner PIRELLI TYRE SPA
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