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tire

A tire and tread technology, applied in special tires, tire parts, tire treads/tread patterns, etc., can solve problems such as different fuel efficiency, and achieve excellent braking performance and excellent handling stability.

Active Publication Date: 2019-09-24
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the other hand, in the case of using tires throughout the year, since the road surface temperature changes with seasonal changes, etc., there are cases where the fuel efficiency of tires operating in a normal temperature environment is different from that of tires operating in a low temperature environment

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] (Samples 1 to 31)

[0116] Rubber compositions were prepared according to the formulation shown in Table 1. Radial tires of size 195 / 65R15 for passenger vehicles were manufactured using the rubber compositions thus prepared each as a tread rubber by a general method. Here, the tread pattern of the manufactured tire adopts figure 1 pattern shown.

[0117] In addition, the loss tangent (tan δ) and storage modulus (E') of the tread rubber using each rubber composition were measured according to the following conditions. The loss at 0°C, 30°C, and 60°C was measured using a spectrometer manufactured by Ueshima Seisakusho Co., Ltd. under the following conditions by collecting a sample of 50 mm x 5 mm x 2 mm from the tread portion of the tire Angular tangent (tan δ) and storage modulus (E') at 0°C: initial strain: 2%; dynamic strain: 1%; and frequency: 52 Hz. The measurement results are shown in Table 1.

[0118] (evaluate)

[0119] The following evaluations were perform...

Embodiment 2

[0147] (Samples 1 to 10)

[0148] Next, samples of tires (size: 195 / 65R15) having the treads of the conditions in Table 2 were manufactured by experiment.

[0149] The condition of the ratio of grooves in the contact surface of the tread of each sample (including the ratio of grooves occupied by circumferential grooves), the condition of the center area (proportion of the center area, the width of the independent land portion, and the lug groove and the narrow pattern groove ( Table 1 shows the case of narrow grooves in the width direction) and the case of the side area (case of lug grooves).

[0150] In addition, the profile of the tread of each sample as Figure 1 to Figure 6 shown.

[0151] In addition, each rubber composition used in the tread of each sample was prepared according to Formulation A in Table 4.

[0152] (Samples 11 to 20)

[0153] In addition, samples of tires (size: 195 / 65R15) having the treads of the conditions of Table 3 were produced by experiments. ...

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Abstract

An object of the present invention is to provide a tire having satisfactory braking performance on dry and slippery roads and having steering stability. In order to achieve this object, the present invention is a tire provided with a tread 10 made of a rubber composition having a tan δ at 0°C of 0.25 to 0.55, the difference between tan δ at 30°C and tan δ at 60°C The difference is -0.02 to 0.07, and the dynamic storage modulus at 0°C with a dynamic strain of 1% is 4 to 20 MPa; the tire is characterized in that the tread 10 has a circumferential pattern extending along the tire circumferential direction C For the grooves 20, the proportion of the grooves in the ground contact surface is 15% to 25%, the proportion of the grooves occupied by the circumferential pattern grooves 20 is 8% to 14%, and the proportion of the grooves occupied by the pattern grooves other than the circumferential pattern grooves 20 7% to 11%.

Description

technical field [0001] The present disclosure relates to a tire. Background technique [0002] In view of improving vehicle safety, it is desired to improve the braking performance and drivability of tires not only on dry roads but also on various roads such as wet roads and ice and snow roads. [0003] For example, PTL1 (JPH09-67469A) discloses a tire using a tread rubber having an increased tan δ at 0° C. in order to improve grip performance on a wet road surface. [0004] On the other hand, when tires are used throughout the year, the fuel efficiency of tires operating in a normal temperature environment may differ from that of tires operating in a low temperature environment because the road surface temperature changes with seasonal changes. It has been found that this change in fuel efficiency increases with increasing tan δ at 0°C. Then, we found that by combining specific physical properties (specifically, tanδ at 0°C is 0.25 to 0.55, the difference between tanδ at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/03B60C1/00B60C11/00B60C11/12B60C11/13C08K3/04C08L7/00C08L9/00C08L61/10C08L91/00C08L93/00
CPCC08K3/04C08L7/00C08L9/00C08L91/00C08L93/00B60C11/0311B60C11/0332B60C2011/0341B60C2011/0358B60C2011/1254B60C2011/129C08L57/02C08L61/02C08L61/12B60C1/0016B60C11/0008B60C11/1236C08K2201/006C08L9/06B60C11/033B60C2011/0025C08K3/22C08K5/02C08K5/03C08K11/00C08K2003/2296
Inventor 富田达也樱井秀之
Owner BRIDGESTONE CORP