JP2013010239A - Method for forming holding body to internal face of tire and forming device used for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for attaching a functional member to the internal face of a tire which can sufficiently surely attach the functional member such as a sound absorption member to the internal face of the tire without damaging an inner liner layer existing at the most internal peripheral side of the tire, and a device used for the method.SOLUTION: When attaching the functional member 4 which imparts a prescribed function to the tire 1 to the internal face 2 of the pneumatic tire 1, the resin material is injected toward the internal face 2 of the manufactured tire 1, and a resin-made member holding body 3 for holding the functional member 4 is integrally adhered to the internal face 2 of the tire, and molded.

Description

  The present invention provides a functional member that gives a tire a required function on the inner surface of a pneumatic tire, for example, a sound absorbing member that reduces road noise during tire rolling, a tire pressure monitoring device, and other electronic devices. The present invention relates to a method for attaching a tire and an apparatus used for the method, and in particular, proposes a technique capable of securely attaching a functional member to the tire inner surface without damaging the tire inner surface.

  As a functional member that is attached to the inner surface of the tire and exhibits a required function, for example, there is a sound absorbing member made of sponge or nonwoven fabric that functions to reduce tire road noise when the vehicle is running. In addition, as described in Patent Document 1, such a sound absorbing member is attached to the inner surface of the tire by application of a double-sided adhesive tape or an adhesive, and thereby, under severe use conditions of the tire. Even if it exists, suppose that peeling from the tire inner surface of a sound absorption member can be prevented reliably.

  By the way, in general, silicon oil or the like applied in advance as a release agent to the surface of the vulcanization bladder is attached to the inner surface of a tire manufactured through a vulcanization molding process, and this release agent is an adhesive. In the above-described mounting method of the sound absorbing member, the release agent attached to the tire inner surface is removed prior to attaching the sound absorbing member. Is required.

Here, as a device for removing the mold release agent on the tire inner surface, Patent Document 2 discloses that “a tire holder that rotatably holds a pneumatic tire and a tread portion of the pneumatic tire that is held by the tire holder”. A scouring tool capable of scouring the inner surface of the tread, and the scouring tool includes a scouring roller provided with a scouring material on an outer peripheral surface and having a rotation axis parallel to the tire rotation axis. A driving motor that rotates the scouring roller, and an axially moving tool that moves the scouring roller in the tire axial direction so that the scouring roller is disposed inside the tire from the bead opening of the pneumatic tire. A radial movement tool including a lifting motor for moving the scouring roller in the tire radial direction to bring the scouring roller into contact with the tread bore surface, and a control device capable of controlling at least the two motors And the controller controls the elevating motor so that the torque of the drive motor becomes a predetermined set value in a scouring step of rotating the scouring roller in contact with the tread bore surface. There has been proposed a tire tread luminal surface cleaning device characterized by controlling and adjusting the radial position of the scouring roller with respect to the tread luminal surface.
And, according to this “tread lumen surface cleaning device”, “the cleaning step of rotating the cleaning roller in contact with the tread lumen surface can be performed, and therefore the mold release attached to the tread lumen surface” In the scouring step, the elevating motor is controlled so that the torque of the driving motor becomes a predetermined set value, and the radius of the scouring roller with respect to the tread bore surface is determined. Since the directional position is adjusted, it is possible to suppress the unevenness of the cleaning and the excessive cleaning, and thus the surface of the tread can be uniformly cleaned, which causes the occurrence of weight imbalance in the tire circumferential direction for each tire. Can be suppressed, and variation in the amount of polishing between tires can be suppressed. "

JP 2007-112395 A JP 2008-62441 A

However, in the case of removing the mold release agent attached to the tire inner surface with an apparatus as described in Patent Document 2, the outer peripheral surface of the “scouring roller” in which fibers having a predetermined rigidity are implanted, Since rubbing against the inner surface of the tire, the inner surface of the tire is scraped off, and there is a risk of damaging the inner liner layer made of a rubber material having excellent air impermeability existing on the innermost circumferential side of the tire. There is a problem in that it becomes difficult to sufficiently secure the function of preventing the air inside the tire from leaking to the outside due to the layer, and the cost of failure increases.
This is a serious problem under recent circumstances where thinning of the inner liner layer is desired.

  Further, in the method of using the double-sided adhesive tape for attaching the sound absorbing member to the tire inner surface, when the tire inner surface has a concavo-convex shape such as a plurality of ridges extending along the inner surface in a projecting posture from the inner surface, Since the adhesive tape may be lifted from the inner surface of the tire in the surroundings, the sound absorbing member may not be sufficiently adhered to the entire surface, so there is a concern that the sound absorbing member may be peeled off from the inner surface of the tire as the tire is used. It was.

  The present invention aims to solve such problems of the prior art, and the object of the present invention is to damage the inner liner layer existing on the innermost circumferential side of the tire. The present invention provides a method for attaching a functional member to a tire inner surface, and a device used in the method, which can attach a functional member such as a sound absorbing member to the tire inner surface sufficiently reliably.

  The method for attaching the functional member to the inner surface of the tire according to the present invention is a functional member that gives the tire the required function on the inner surface of the pneumatic tire, for example, a sound absorbing member, a storage battery for vibration power generation, a tire internal pressure monitoring device, etc. When mounting the electronic device, etc., a resin material is preferably injected into the inner surface of the manufactured tire to hold the functional member on the inner surface of the tire, preferably a thermoplastic elastomer or silicon rubber The holder is integrally fixed and molded.

  Preferably, a member holding body that protrudes from the tire inner surface and has a cross-sectional shape is formed on the inner surface of the tire, and the functional member can be fitted on the outer peripheral side of the hook-shaped portion of the member holding body.

  The holding body forming apparatus according to the present invention is used in any one of the above holding body forming methods, and includes a positioning and fixing means for supporting the manufactured tire and a contact posture with the tire inner surface. A molding die composed of a plurality of segments capable of expanding and contracting in diameter to form a cavity between the inner surface and a mold moving means for displacing the molding die in a direction away from and approaching the tire inner surface. It is something to be made.

According to the method for forming a holding body on the tire inner surface of the present invention, a resin member holding body for attaching a functional member to the tire inner surface is injection-molded, and the member holding body is integrally fixed to the tire inner surface. Accordingly, the functional member can be reliably attached to the tire inner surface via the member holder, regardless of the release agent attached to the tire inner surface or the uneven shape provided on the tire inner surface.
In addition, this method eliminates the need to remove the mold release agent using a conventional “sharpening device” or the like, and therefore does not damage the tire inner surface.

Here, when the resin member holder is formed of thermoplastic elastomer or silicon rubber, the functional member is more securely attached to the tire inner surface because of the large fixing force inherent to the tire inner surface inherent to those materials. Can be attached.
In particular, since thermoplastic elastomers are lightweight and rich in elasticity, by making the member holder made of thermoplastic elastomer, the member holder formed on the inner surface of the tire is deformed when the tire rolls under load. The influence on various performances such as can be suppressed sufficiently small.

  Here, when a member holding body that protrudes from the tire inner surface and has a bowl-like cross-sectional shape is formed on the tire inner face, and the functional member can be fitted into the hook-like portion of the member holding body, The functional member can be removed to achieve a strong mounting.

  By the way, according to the member holder forming apparatus of the present invention, the mold moving means is operated under the support of the product tire by the positioning and fixing means, and the molding die is in contact with the tire inner surface. By performing the molding, the member holder can be molded easily and quickly on the inner surface of the annular product tire at a predetermined interval in the circumferential direction.

It is sectional drawing of the tire width direction which shows the member holding body formed in the tire inner surface by one Embodiment of this invention in the state which mounted | wore the outer peripheral side of the hook-shaped part with the functional member. It is a figure similar to FIG. 1 which shows the modification of the member holding body formed in a tire inner surface. It is the same figure as FIG. 1 which shows another functional member in the state attached to the tire inner surface, and the top view of the functional member. It is a perspective view which shows a part of apparatus for forming the holding body of FIG. 1 in the state which has arrange | positioned the tire. It is the longitudinal cross-sectional view of the apparatus of FIG. 4, and the principal part expanded sectional view. It is a figure which shows the other mechanism which can be used for the metal mold | die moving means of the apparatus of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
Although not shown in detail, the tire shown in each figure is also a pair of bead cores disposed in each bead portion, a carcass extending in a toroidal manner between the bead cores, and an outer peripheral side of the carcass. The belt is provided with a belt, a tread rubber, and the like.

In FIG. 1, reference numeral 1 denotes a tire, and reference numeral 2 denotes an inner surface of the tire 1 facing an air chamber formed in a rim assembly posture.
Here, a resin member holding body 3 is integrally fixed to the tire inner surface 2 and is formed of a non-woven fabric as a functional member on the outer peripheral side of the flanges 3a and 3b of the member holding body 3. The sound absorbing member 4 is held. Note that the sound absorbing member 4 can also be formed of a sponge.

Here, the member holding body 3 can be integrally formed on the tire inner surface 2 by injecting a resin material onto the inner surface 2 of the manufactured tire 1 and cooling and hardening the resin material. As shown in FIG. The member holding body 3 is a saddle-like cross-sectional shape that protrudes from the tire inner surface 2 and has a pair of saddle-like transverse cross-sectional shapes that are provided on both sides of the tire equatorial plane C and bent toward the tire equatorial plane C. It shall be provided with the parts 3a and 3b.
According to this, the sound absorbing member 4 can be sandwiched and mounted between the flange-shaped portions 3a and 3b of the member holding body 3 on the outer peripheral side thereof in a state of being compressed and deformed as shown in the drawing.

Thus, by attaching the sound absorbing member 4 to the inner surface 2 side of the tire 1, a release agent applied in advance to the vulcanization bladder at the time of vulcanization molding adheres to the tire inner surface 2, or the tire inner surface 2. Even if there is a concavo-convex shape, the injection molded member holder 3 can be firmly fixed to the tire inner surface 2, so that the sound absorbing member 4 can be securely attached to the tire inner surface 2. can do.
Further, the sound absorbing member 4 can be easily attached to and detached from the member holding body 3, and the sound absorbing member 4 can be maintained and replaced very easily.

Here, in order to firmly fix the resin member holding member to the tire inner surface 2 without performing primer treatment on the tire inner surface 2, a resin material for molding the member holding member is made of a thermoplastic elastomer or silicon rubber. In particular, when the member holder is made of a lightweight thermoplastic elastomer rich in elasticity, the influence of the member holder integrally fixed to the tire inner surface 2 on various performances of the tire is sufficiently reduced. It is more preferable at the point which can do.
In addition, as a thermoplastic elastomer, what consists of styrene-type thermoplastic elastomer, paraffin-type oil, polyolefin, polyphenylene ether, etc. can be used, for example.

Here, the member holding body to be molded on the inner surface of the tire can be shaped as shown in FIG. 2, for example, by changing the inner surface shape of a molding die described later used for injection molding.
A member holding body 13 shown in FIG. 2 has a sheet-like base portion 13a that extends substantially parallel to the inner surface 2 in the cross section in the tire width direction and is fixed to the inner surface 2 over the entire upper surface in the figure, and a tire equatorial plane C. A flange-like portion 13b that is provided at a distance and protrudes from the sheet-like base portion 13a and has an inverted T-shape in the cross section shown in the drawing, that is, bent toward the equator plane C side and the side away from the equator plane C. It is formed by the hook-shaped portion 13b.
As shown in FIG. 2, the sound absorbing member 14 is attached to the member holding body 13 in advance by providing a concave groove portion 14 a that matches the shape of the T-shaped bowl-shaped portion 13 b of the member holding body 13. This can be done by fitting the groove 14a into the T-shaped hook 13b.

The functional member attached to the member holder can be the electronic substrate 24 of the vibration power generation element as illustrated in FIG. 3 instead of the sound absorbing members 4 and 14 described above. In this case, the member holding The electronic substrate 24 can be fitted and held on the body 23.
Although not shown, the functional member can be a tire internal pressure monitoring device.

By the way, in order to form the member holding body as described above on the tire inner surface, for example, a holding body forming apparatus 30 shown in FIGS. 4 and 5 can be used.
The illustrated apparatus 30 has a molding die 32 composed of a plurality of segments 31 that can be displaced in an expanding and contracting manner, arranged side by side in the circumferential direction of the product tire 1 that is arranged as shown in a perspective view in FIG. The molding die 32 is arranged on the inner side of the tire 1 from the side of the tire 1 attached to the apparatus 30 facing upward in the drawing, as indicated by a white arrow in FIG.

  Here, in addition to the above-described molding die 32, the device 30 includes a support base 33 as a positioning and fixing means for supporting the tire 1 and an inner side of the tire 1 as shown in a sectional view in FIG. A mold moving means 34 for displacing the segments 31 in a direction to be separated and approaching the tire inner surface 2, and more directly, a liquid resin material toward the segments 31. And an extruder 35 and a connecting pipe 36 which are fed through an injection nozzle (not shown), and a mechanical part of the mold moving means 34 and a sleeve 37 which houses the connecting pipe 36.

Here, as shown in FIG. 5 (a), the mold moving means 34 has one end side hinge-connected to each segment 31 of the molding mold 32, and in the figure, a pair of upper and lower arc-shaped links 38, 39. Two of the other end sides are arranged above and below the tire 1 and are hinged to the movable plates 40 and 41, both of which can be displaced in the vertical direction, and the vertical displacement of the movable plates 40 and 41 is brought about. A drive source (not shown) is provided.
According to such a mold moving means 34, the respective movable plates 40 and 41 are displaced toward the side surface of the tire 1, whereby the segment 31 is indicated by a broken line in FIG. Can be displaced in a direction approaching the tire inner surface 2 and brought into contact with the tire inner surface 2 as shown by a solid line in FIG.

As shown in an enlarged view in FIG. 5B, each segment 31 abutted against the tire inner surface 2 defines a cavity between the tire inner surface 2 and a connecting pipe 36 from the extruder 35. By injecting the liquid resin material fed through and cooling and curing the resin material, the resin holder 3 can be intermittently molded in the circumferential direction on the tire inner surface 2.
Here, the movable plates 40 and 41 fitted to the bead portion of the tire 1 in the contact posture of the segment 31 with the tire inner surface 2 at the time of injection molding are also the positioning and fixing means together with the support base 33. Part of it.

  Here, the mold moving means is a so-called magic hand type or pantograph type link mechanism as exemplified in FIGS. 6A and 6B instead of the pair of arcuate links 38 and 39 shown in FIG. In addition to these, it is possible to employ a known mechanism for moving the segment 31 forward and backward with respect to the tire inner surface 2.

DESCRIPTION OF SYMBOLS 1 Tire 2 Tire inner surface 3,13,23 Member holding body 4,14,24 Functional member 30 Holding body formation apparatus
31 segment 32 molding die 33 support stand 34 mold moving means 35 extruder 36 connecting pipe 37 sleeve 38, 39 link 40, 41 movable plate

Claims (4)

  When attaching a functional member that gives the tire a required function on the inner surface of the pneumatic tire, a resin material is injected toward the inner surface of the manufactured tire to hold the functional member on the inner surface of the tire. A method for forming a holding body on an inner surface of a tire, wherein the member holding body is integrally fixed and molded.   The method for forming a holding body on the tire inner surface according to claim 1, wherein the resin member holding body is formed of a thermoplastic elastomer or silicon rubber.   The member holding body which protrudes from the tire inner surface and has a hook-like cross section is formed on the tire inner face, and the functional member can be fitted on the outer peripheral side of the hook-like portion of the member holding body. A method for forming a holding body on the inner surface of a tire. A holding body forming apparatus for use in the holding body forming method according to claim 1,
Positioning and fixing means for supporting the manufactured tire, a molding die composed of a plurality of segments capable of expanding and contracting diameter expansion and contraction forming a cavity between the tire inner surface in a contact posture with the tire inner surface, and the molding An apparatus for forming a holding body, comprising: a mold moving means for displacing a mold in a direction away from and approaching an inner surface of a tire.

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