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

Pneumatic tyre

A pneumatic tire and bead technology, applied to the reinforcement layer of pneumatic tires, tire parts, bead edges, etc., can solve the problems of bad influence on tire ride comfort, and achieve improved ride comfort and run-flat durability Improved effect

Active Publication Date: 2015-05-20
SUMITOMO RUBBER IND LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The apex will adversely affect the ride comfort 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 more

Image

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] obtained figure 1 A pneumatic tire (size=215 / 45R17) of Example 1 having the basic structure shown and having the specifications shown in Table 1 below. In this Example 1, the complex elastic modulus Ea of the inner apex of the bead was set to 12 MPa. The height Ha in the radial direction from the bead base line to the outer end PA of the inner apex was 30 mm. The complex elastic modulus Eb of the outer apex of the bead was set to 70 MPa. The height Hb in the radial direction from the bead base line to the outer end PB of the outer apex was 40 mm. The complex elastic modulus Ec of the embedded layer was set to 12 MPa. In addition, the radial height Hw from the bead base line to the axial maximum width position PW of the inner surface of the tire was set to 43 mm.

[0082] In Example 1, the ratio (Ea / Eb) of the elastic modulus Ea to the elastic modulus Eb was 0.17. The ratio (Ea / Ec) of the elastic modulus Ea to the elastic modulus Ec was 1.00. The ratio (Hb / Hw) of t...

Embodiment 2-3 and comparative example 1-2

[0084] Except that the elastic modulus Ea is changed according to the following Table 1, the ratio (Ea / Eb) and the ratio (Ea / Ec) are set to be the same as in Example 1, thereby obtaining Examples 2-3 and Comparative Examples 1- 2 tires.

Embodiment 4-5 and comparative example 3

[0086] Tires of Examples 4-5 and Comparative Example 3 were obtained in the same manner as in Example 1 except that the modulus of elasticity Eb was changed from the ratio (Ea / Eb) according to Table 2 below.

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

PropertyMeasurementUnit
Complex elastic modulusaaaaaaaaaa
Complex elastic modulusaaaaaaaaaa
Complex elastic modulusaaaaaaaaaa
Login to View More

Abstract

The invention provides a pneumatic tyre (2). The pneumatic tyre (2) is excellent in riding comfort and leakage warranty durability. The tyre is provided with a tyre ring (10), a tyre body (12) and an embedding layer (18). The tyre body is provided with carcass ply (36), and an inner side accessory (34a) of the tyre ring is provided with an inner side core body (46a) which is internally connected to the end of the carcass ply and an inner side bead filler (48a) which covers the inner side core body and extends roughly towards the outer side of the radius direction from the inner side core body. An outer side accessory (34b) of the tyre ring is provided with an outer side core body (46b) which is externally connected to the end of the carcass ply and an outer side bead filler (48b) which cover the outer side core body and extends roughly towards the outer side of the radius direction from the outer side core body. The ratio of complex modulus Ea of the inner side bead filler relative to complex modulus Eb of the outer side bead filler is below 0.3. The ratio of the complex modulus Ea of the inner side bead filler relative to complex modulus Ec of the embedding layer is above 1.

Description

technical field [0001] The present invention relates to a pneumatic tire. Background technique [0002] In recent years, run-flat tires having an insert (also referred to as a load bearing layer) inside a sidewall portion have been developed and popularized. Such run-flat tires are also called sidewall-reinforced run-flat tires. [0003] For sidewall-reinforced run-flat tires, if the internal pressure drops due to a puncture, the weight of the vehicle will be carried by the insert. Even if the run-flat tire is in a punctured state, it is possible to travel a certain distance. For cars equipped with this run-flat tire, there is no need to keep a spare wheel on hand. By adopting this run-flat tire, replacement of tires at inconvenient places can be avoided. An example of a sidewall-reinforced run-flat tire is disclosed in JP-A-2005-126555. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2005-126555 [0005] The tire has beads. The bead includes a core and an a...

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
IPC IPC(8): B60C9/02B60C15/06
Inventor 伊藤博
Owner SUMITOMO RUBBER IND LTD