JP2015020731A - Pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for improving sticking workability when manually sticking a member in a pneumatic tire comprising the member stuck to an inner surface of the tire in a tire circumference direction.SOLUTION: The pneumatic tire comprises a circumferential member 4 arranged on an inner surface of the tire in a tire circumference direction, where at least one circumferential protrusion 5 or groove extending in the tire circumference direction is formed on the inner surface of the tire and the circumferential member 4 is stuck to the inner surface of the tire with reference to the circumferential protrusion 5 or the groove.

Description

  The present invention relates to a pneumatic tire (hereinafter, also simply referred to as “tire”), and more particularly, to an improvement of a pneumatic tire including a member attached to the inner surface of the tire along the circumferential direction.

  In general, in a pneumatic tire mounted on a rim and attached to a vehicle, the surface of the tread portion vibrates in contact with the unevenness of the road surface while the vehicle is running, thereby causing cavity resonance of air filled in the tire lumen. Arise. This cavity resonance is a main cause of so-called road noise, and many of the resonance frequencies exist in the range of 180 to 300 Hz. When the road noise is transmitted to the vehicle interior, unlike a noise in other frequency bands, it becomes a sharp and high peak value, which is annoying noise for passengers in the vehicle interior.

  In order to suppress such tire cavity resonance and reduce road noise, a member having a sound absorbing property such as a nonwoven fabric or sponge material is arranged on the tire inner surface, and the cavity resonance sound is absorbed by this member. Technologies for reducing noise are known. For example, Patent Document 1 proposes a pneumatic tire in which a nonwoven fabric is fixed to the tire inner surface. As a method for attaching these non-woven fabrics and sponge materials to the inner surface of the tire, there is a method of manual operation or a method using a dedicated application device, and it is general that the application is performed manually.

JP 2004-82387 A (Claims etc.)

  When affixing the above member to the tire inner surface along the tire circumferential direction, it is desirable that the member is affixed straight in the tire circumferential direction in appearance. However, since there is no mark along the tire circumferential direction on the inner surface of the tire, it is difficult for the worker who is not familiar with the work to stick it straight, and when the sticking position is shifted without being attached straightly Is a cause of lowering the manufacturing yield because re-sticking is required.

  Accordingly, an object of the present invention is to solve the above-mentioned problems and improve the pasting workability in a pneumatic tire including a member pasted on the tire inner surface along the tire circumferential direction when the member is manually pasted. It is to provide a technique for doing this.

As a result of intensive studies, the present inventor has found that the above-described problem can be solved by adopting the following configuration, and has completed the present invention.
That is, the pneumatic tire of the present invention is a pneumatic tire provided with a circumferential member disposed along the tire circumferential direction on the tire inner surface, or a circumferential protrusion or a projection extending along the tire circumferential direction on the tire inner surface. At least one groove is provided, and the circumferential member is affixed to the tire inner surface with the circumferential protrusion or groove as a reference.

  The pneumatic tire of the present invention is preferably vulcanized using a bladder for inflating a raw tire from the inner side in the tire radial direction in the vulcanization step at the time of tire manufacture, and the circumferential protrusion or It is preferable that the groove is a bladder ridge formed by a circumferential groove or protrusion provided on the outer surface of the bladder.

  According to the present invention, in a pneumatic tire including a member attached to the tire inner surface along the tire circumferential direction, it is possible to improve the attaching workability when the member attaching operation is performed manually.

It is a width direction sectional view showing an example of the pneumatic tire of the present invention. It is explanatory drawing which shows the formation state of the bladder ridge of (a) an example of this invention, (b) the other example of this invention, and (c) the prior art example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view in the width direction showing an example of the pneumatic tire of the present invention. The illustrated pneumatic tire includes a pair of bead portions 11, a pair of sidewall portions 12 connected to the outer side in the tire radial direction, and a tread portion 13 extending across the pair of sidewall portions 12. The illustrated tire has at least one carcass 2 extending in a toroid shape between bead cores 1 embedded in a pair of bead portions 11, in the illustrated example, a carcass 2 made of one carcass ply, and a crown of the carcass 2. A belt layer 3 composed of at least one belt, usually two or more, and two belts 3a and 3b in the illustrated example, is arranged on the outer side in the radial direction of the partial tire.

  As shown in the figure, the pneumatic tire of the present invention includes a circumferential member 4 disposed on the tire inner surface along the tire circumferential direction. In the tire of the present invention, a circumferential protrusion 5 extending along the tire circumferential direction is provided on the tire inner surface, and the circumferential member 4 is attached to the tire inner surface with the circumferential protrusion 5 as a reference. There is a feature in that.

  Thus, by providing the circumferential protrusion 5 as a mark in the tire circumferential direction on the tire inner surface, the circumferential protrusion 5 is used as a reference when performing the work of attaching the circumferential member 4 to the tire inner surface. be able to. Therefore, even an operator who is not proficient in the work can easily apply the circumferential member 4 straight, reduce the occurrence of defects in which the attaching position of the circumferential member 4 is shifted, and improve the attaching workability. Can do. Further, the circumferential protrusion 5 may be a circumferential groove.

  Since the circumferential protrusion 5 or the groove is only required to be a mark when the circumferential member 4 is attached to the tire inner surface, at least one circumferential protrusion 5 may be provided. In the illustrated example, the circumferential protrusions 5 are provided in total in the vicinity of the outer side in the tire width direction of the circumferential member 4, one on each side, but a total of two or more on one side may be provided. it can. Further, the circumferential protrusion 5 or the groove may be formed at any position other than the position where the circumferential member 4 is pasted on the inner surface of the tire, but from the viewpoint of further improving the pasting workability. As shown in the figure, it is preferable that the circumferential member 4 is provided at a position that defines the width direction end of the application position.

  There is no restriction | limiting in particular about the shape of the circumferential protrusion 5 or a groove | channel, For example, it can be set as a cross-sectional substantially semicircle shape as shown in figure. Moreover, although it is preferable to form the circumferential protrusion 5 or a groove | channel over the perimeter of a tire, even if it is continuously connected in the perimeter, it may not be connected in partial broken line shape. Furthermore, the dimension of the circumferential protrusion 5 or the groove is not particularly limited as long as it can be used as a mark. For example, the width is about 0.5 mm to 3 mm, and the height in the case of the protrusion is 0. 0.5 mm to 3 mm, and the depth in the case of a groove can be 0.5 mm or less.

  In the present invention, examples of the circumferential member 4 to be affixed to the tire inner surface include a sound absorbing material made of a sound absorbing material such as a nonwoven fabric or sponge. By affixing the sound absorbing material to the tire inner surface as the circumferential member 4, it is possible to obtain an effect of reducing road noise by reducing the cavity resonance of the tire. Here, in the present invention, the non-woven fabric refers to a material bonded without weaving fibers, and for example, organic fibers such as rayon and aramid, and inorganic fibers such as glass and carbon can be used. . In the present invention, the sponge refers to an artificial or natural so-called porous structure. For example, in addition to a so-called synthetic sponge formed by foaming rubber or synthetic resin, an animal or vegetable so-called natural sponge is used. it can.

  The pneumatic tire of the present invention can be produced by vulcanizing a raw tire using a tire vulcanization bladder that inflates the raw tire from the inner side in the tire radial direction in the vulcanization step during tire production. That is, by providing a circumferential groove or projection corresponding to the circumferential projection 5 or groove on the outer surface of the bladder, the circumferential groove or projection is transferred to the inner surface of the tire during vulcanization, and the bladder lid As a result, a circumferential protrusion 5 or groove is formed. Therefore, the pneumatic tire of the present invention can be easily manufactured by a normal tire manufacturing process only by providing predetermined circumferential grooves or protrusions on the outer surface of the bladder used during vulcanization.

  Here, the bladder used at the time of vulcanization is usually inclined with respect to the tire width direction in a region corresponding to the tread portion 13 to the bead portion 11 of the tire for the purpose of removing air existing between the bladder and the tire. An air vent groove extending in the direction to be provided is provided. FIG. 2C shows a conventional bladder ridge 6 formed on the tire inner surface after vulcanization by the air vent groove. On the other hand, as shown in FIG. 2A, the tire according to an example of the present invention has a circumferential protrusion 5 as a bladder ridge formed by a circumferential groove in addition to the conventional bladder ridge 6 on the tire inner surface. ing. Moreover, in the tire of this invention, depending on the width | variety of the sticking area | region of the circumferential member 4, as shown in FIG.2 (b), the conventional bladder ridge 6 and the circumferential protrusion 5 may cross | intersect. As shown in FIG. 2 (b), when the conventional bladder ridge 6 and the circumferential protrusion 5 are crossed, that is, when the air bleeding groove and the circumferential groove are crossed, as shown in FIG. As compared with the case where the crossing is not performed, the air release property during vulcanization can be improved.

  In the tire of the present invention, only the point provided with the circumferential member 4 and the circumferential projection 5 or the groove is important, and other points are not particularly limited, and can be appropriately configured according to a conventional method. . For example, in the tire of the present invention, a tread pattern is appropriately formed on the surface of the tread portion 13, and an inner liner (not shown) is formed on the innermost layer. Furthermore, in the tire of the present invention, as the gas filled in the tire, normal or air with a changed oxygen partial pressure, or an inert gas such as nitrogen can be used.

Hereinafter, the present invention will be described in more detail with reference to examples.
<Example>
As shown in FIG. 1, a pneumatic tire provided with a circumferential member disposed along the tire circumferential direction on the tire inner surface is produced by pasting the circumferential member on the tire inner surface of the vulcanized tire. did. By providing a circumferential groove on the outer surface of the bladder to be used when the raw tire is vulcanized with a bladder that swells from the inside in the tire radial direction in the vulcanization process during tire manufacture, As shown in FIGS. 1 and 2A, two circumferential projections as bladder ridges were formed along the tire circumferential direction. The dimensions of the circumferential protrusions were 1 mm in width and 0.5 mm in height.

<Conventional example>
As shown in FIG. 2C, the circumferential member disposed on the tire inner surface along the tire circumferential direction is the same as the embodiment except that only the conventional air bleeding bladder lid is formed as the bladder lid. A pneumatic tire including a tire was prepared by sticking a circumferential member on the tire inner surface of the vulcanized tire.

  As a result, in the embodiment, by sticking the circumferential member to the tire inner surface with the two circumferential protrusions as a reference, the occurrence rate of sticking failure is reduced compared to the case of the conventional example, and workability is improved. It was confirmed that it improved.

DESCRIPTION OF SYMBOLS 1 Bead core 2 Carcass 3 Belt layer 4 Circumferential member 5 Circumferential protrusion 6 Bladder ridge 11 Bead part 12 Side wall part 13 Tread part

Claims (2)

In the pneumatic tire provided with a circumferential member disposed along the tire circumferential direction on the tire inner surface,
The tire inner surface is provided with at least one circumferential protrusion or groove extending along the tire circumferential direction, and the circumferential member is attached to the tire inner surface with the circumferential protrusion or groove as a reference. A pneumatic tire characterized by having In the vulcanization process at the time of tire manufacture, a raw tire is vulcanized using a bladder that swells from the inside in the tire radial direction, and the circumferential protrusion or groove is a circumferential groove or groove provided on the outer surface of the bladder. The pneumatic tire according to claim 1, which is a bladder ridge formed by protrusions.

Images