JP6349927B2 - Tire noise reduction device and pneumatic tire - Google Patents

Description

  The present invention relates to a tire noise reduction device and a pneumatic tire.

  Conventionally, in the pneumatic tire field, a tire noise reduction device including a sound absorbing material made of a porous material and a band member for mounting the sound absorbing material on the inner surface of the tire is known (Patent Document 1-2). .

As the band member, one configured to have elastic characteristics depending on the material and the overall shape is known. The typical shape is a belt-like shape, and a long strip-like plate material is formed in an annular shape as a whole, and a sound-absorbing material made of a porous material is moved toward the tire inner surface by its elastic restoring force within the tire lumen. The sound absorbing material is urged so as to be pressed toward the sound source, and the sound absorbing material is held (the claim of Patent Document 1 and paragraph 0016 of Patent Document 2).
The material of the band member is known to be made of a thermoplastic synthetic resin or a metal, and the band member itself can be molded or bonded using a sound absorbing material made of a porous material and heat fusion. A band member made of a thermoplastic synthetic resin has been studied as a practical material in terms of excellent bonding processability (Patent Documents 2-3).

International Publication No. 2005/012007 JP 2006-306285 A JP 2010-950 A

  However, a band member made of a thermoplastic synthetic resin is used for a tire designed to be able to run at a very high speed (for example, 300 km / hour or more) compared to a tire size for which a noise reduction device has been conventionally used. When the tire noise reduction device is applied, the band member receives a large tension due to the mass of the sound absorbing material, and the heat generation of the tire softens the thermoplastic synthetic resin constituting the band member, so that the band member becomes plastic. There has been a case where deformation (usually deformation that stretches) occurs. When the band member undergoes such plastic deformation, the sound absorbing material based on the elastic characteristics cannot be properly held, and the function of the noise reduction device cannot be fully exhibited, or the durability is impaired and the noise is reduced. There was also a risk of the destruction of the reduction device.

  In view of the above-described points, the object of the present invention is to suppress plastic deformation of the band member due to the heat of the tire even when the tire for high-speed traveling is traveling at a high speed such as 300 km / h or more. An object of the present invention is to provide a tire noise reduction device and a pneumatic tire that can sufficiently exhibit a noise reduction function even under such high-speed traveling.

The tire noise reduction device of the present invention that achieves the above-described object has the following configuration (1).
(1) A sound-absorbing material made of a porous material and a band member formed in an annular shape for mounting the sound-absorbing material on the inner surface of the tire, and fixing the sound-absorbing material to the inner surface side of the annular band member In the tire noise reduction device, the band member is made of a thermoplastic resin, a heat insulating layer is provided on the outer surface side of the annular band member, the thickness of the heat insulating layer is 3 to 12 mm, and the density is 15 A tire noise reduction device, characterized in that it has a tensile strength of 80 kPa or more and a hardness of 80 to 120 N, having a tear strength of 6 to 10 N / cm, a hardness of ˜30 kg / m ³ .
The pneumatic tire of the present invention that achieves the above-described object has the following configuration (9).
(9) A sound absorbing material made of a porous material and a band member formed in an annular shape for mounting the sound absorbing material on the inner surface of the tire, and fixing the sound absorbing material on the inner surface side of the annular band member In a pneumatic tire equipped with a tire noise reduction device in the tire lumen,
The band member is made of a thermoplastic resin, a heat insulating layer is provided on the outer surface side of the annular band member, and the width W of the heat insulating layer in the tire noise reduction device is the width Wb of the band member, the sound absorption In the state where the relationship between the maximum width Ws of the material and the following formulas (a) and (b) is satisfied and the tire noise reduction device is mounted in the tire and filled with air pressure, A pneumatic tire characterized in that a space is formed between the inner surface of the tire.
Insulation layer width W> band member width Wb (a) formula
Thermal insulation layer width W <Sound-absorbing material maximum width Ws × 0.7 (b) formula

The tire noise reduction device of the present invention preferably has any one of the following configurations (2) to (6) .
(2) The tire noise reduction device according to (1), wherein the heat insulating layer is also fixed to the outer surface side of the band member by means for fixing the band member and the sound absorbing material to each other.
(3) The band member and the sound absorbing material are joined by an ultrasonic welding method to form an engaging member made of the same material as the band member, and the sound absorbing material is penetrated. It has been welded and fixed, and the state in which the heat insulating layer is Kai winding around the band member in the tire width direction, that is fixed in association with the welding fixation of the engaging member and the band member The tire noise reduction device according to (1) or (2), characterized in that:
(4) The tire noise reduction device according to any one of (1) to (3), wherein the heat insulating layer is spirally arranged around the band member.
(5) The tire noise reduction device according to any one of (1) to (4), wherein the heat insulating layer has a thermal conductivity of 0.040 W / (m · k) or less.
(6) The tire noise reduction device according to any one of (1) to (5) above, wherein the sound absorbing material has a large number of through holes that are open in the tire radial direction.

The pneumatic tire of the present invention that achieves the above-described object has the following configuration (7) .
(7) A pneumatic tire comprising the tire noise reduction device according to any one of (1) to (6) above in a tire lumen.
Further, the pneumatic tire of the present invention preferably has the following configuration (8) .
(8) The width W of the heat insulation layer in the tire noise reduction device satisfies the relationship between the width Wb of the band member, the maximum width Ws of the sound absorbing material, and the following formulas (a) and (b): The tire noise reduction device is mounted in the tire and filled with air pressure so that a space is formed between the sound absorbing material and the tire inner surface. (7) The pneumatic tire according to the description.
Thermal insulation layer width W> band member width Wb (a) formula Thermal insulation layer width W <sound absorber maximum width Ws × 0.7 (b) formula

According to the first aspect of the present invention, even when a high-speed running tire is running at a high speed such as 300 km / h or more, it is possible to suppress plastic deformation of the band member due to the heat of the tire, and durability. It is possible to provide a tire noise reduction device that can sufficiently exhibit the noise reduction function.
Further, according to the present invention of claim 9, even when the vehicle is traveling at a high speed of 300 km / h or more, the plastic deformation of the band member due to the heat of the tire can be suppressed, and the durability and noise reduction are improved. A pneumatic tire capable of sufficiently exhibiting the function can be provided.

According to the tire noise reduction device of the present invention according to any one of claims 2 to 6, a tire noise reduction device having the effect of the present invention according to claim 1 described above more clearly can be realized.
According to the pneumatic tire concerning this invention concerning Claim 7 or 8 , the pneumatic tire equipped with the noise reduction device for tire concerning the present invention concerning any one of above-mentioned Claims 1-6 is provided, and it is 300 km / h. Even when the vehicle is traveling at a high speed as described above, a plastic tire that can suppress the plastic deformation of the band member due to the heat of the tire and has a good durability and a noise reduction function is provided.

1 is an external perspective view schematically showing an embodiment of a tire noise reduction device according to the present invention. (A), (b) is sectional drawing of the tire width direction which showed typically the example of 1 embodiment of the tire noise reduction apparatus concerning this invention. It is sectional drawing of the tire width direction which showed in another model the example of another embodiment of the noise reduction apparatus for tires concerning this invention. FIG. 3A is a partially broken view showing an embodiment of the pneumatic tire according to the present invention in which the tire noise reduction device according to the present invention whose model is shown in FIG. It is a fragmentary perspective view, (b) is the enlarged view which expanded and showed the principal part. (A)-(c) is a model figure explaining one example process of the method of manufacturing the noise reduction apparatus for tires concerning this invention, (A), (b) is the external appearance perspective view which modeled another example of the other embodiment of the tire noise reduction apparatus concerning this invention. It is the perspective view which showed another example of the engagement state of the band member and heat resistant reinforcement layer in the noise reduction apparatus for tires concerning this invention.

  Hereinafter, the present invention will be described in more detail with reference to the drawings.

  The tire noise reduction device 1 of the present invention, as shown in the perspective view of the appearance of one embodiment thereof in FIG. 1, is for mounting the sound absorbing material 2 made of a porous material and the sound absorbing material 2 on the tire inner surface. In a tire noise reduction device having a band member 3 formed in an annular shape and fixing the sound absorbing material 2 to the inner surface side of the annular band member 3, the band member 3 is made of a thermoplastic resin. The heat insulating layer 4 is provided on the outer surface side of the annular band member 3.

  2 (a) and 2 (b) are cross-sectional views in the tire width direction schematically showing an embodiment of a tire noise reduction device according to the present invention. 1A is a cross-sectional view of the structure shown in FIG. 1, and FIG. 1B is a cross-sectional view showing an example using a fixing member 5 that may be used as necessary. The fixing member 5 is used to fix the fixing band 3 and the sound absorbing material 2 to each other. For example, the fixing member 5 is a plate-like member made of thermoplastic resin (fixing plate or fixing chip). Using, for example, a vibration horn (not shown) of an ultrasonic welder is pressed against the fixing member 5 from above the fixing member 5 to thermally deform the fixing member 5 and the sound absorbing material 2. The three members of the sound absorbing material 2, the band member 3, and the fixing member 5 and the four members including the heat insulating layer 4 can be fixed to each other by hot melt bonding.

  By providing the heat insulating layer 4 on the outer peripheral surface of the annular band member 3 made of thermoplastic resin in this way, for example, a sound absorbing material made of a porous material for a tire that can run at an extremely high speed such as 300 km / hour or more. Even when the material 2 is applied, the heat generated by the tire is less likely to be transmitted to the band member 3, and the resin constituting the band member 3 is suppressed from being softened by the heat. As a result, the band member 3 is plastically deformed. (Elongation) is suppressed, the durability of the tire noise reduction device 1 becomes extremely good, and a tire noise reduction device that can sufficiently exhibit the noise reduction function can be realized.

  For the band member 3, it is preferable to use a resin having excellent durability against repeated bending deformation. For example, it is preferable to use a polypropylene resin (PP resin). It is preferable that the heat insulating layer 4 can follow the repeated bending deformation applied to the band member 3 and has high durability against the repeated bending deformation.

  In addition, the heat insulating layer 4 is not particularly limited as long as it has an excellent heat insulating function, but typically, it is preferably configured using a material having a small apparent specific gravity made of a porous material. A porous polyurethane foam material or the like can be preferably used. Moreover, glass wool etc. can also be used.

  For example, in the case of the method shown in FIG. 2A (method not using the fixing member 5), the heat insulating layer 4 and the band member 3 are joined on at least one surface of the heat insulating layer 4 side. It is preferable to use one having an adhesive layer (not shown) and configured so that the heat insulating layer 4 can be easily adhered to the band member 3. The adhesive layer is preferably an acrylic or rubber adhesive from the viewpoint of heat resistance. Further, the heat insulating layer 4 may be provided with the same width as the full width of the band member (w in FIG. 1), but the effect is not necessarily full width. The width of the heat insulating layer is (0.5 to 1) × w, and it is preferable that the band member and the center line are aligned with each other.

  In order to increase the effect of the present invention, it is preferable that the heat insulating layer 4 is installed by winding the entire circumference of the band member 3 on the cross section in the tire width direction at least one turn and at least one turn. An example of the structure is shown in FIG. In the example shown in FIG. 3, the heat insulating layer 4 starts from the upper left end portion of the band member 3 in the drawing, is wound so as to pass through the upper right end portion and below the band member 3, and further the upper left end portion. (1 lap), and further up to the upper right end is wound about 1 and a half turns in total. When the heat insulating layer 4 is arranged and provided around the band member 3 in this manner, the heat of the tire transmitted to the band member 3 becomes very small.

  When the heat insulating layer 4 is wound around the outer periphery of the band member 3 as described above, the heat insulating layer 4 is insulated by means (fixing member 5) for fixing the band member 3 and the sound absorbing material 2 to each other as shown in FIG. It is preferable that the layer 4 is also fixed to the outer surface side of the band member.

FIG. 4 shows a pneumatic tire according to the present invention which is a preferred embodiment described above.
In FIG. 4, the pneumatic tire T includes a tread portion 10, a pair of left and right bead portions 11, and a sidewall portion 12 that connects the tread portion and the bead portion 11 to each other. A ring-shaped tire noise reduction device 1 whose model is shown in FIG. 1 is mounted on the inner surface of the tread portion 10.

  The tire noise reduction device 1 includes a sound absorbing material 2 made of a porous material, and a band member 3 for mounting the sound absorbing material 2 on the tire inner surface. The sound absorbing material 2 has a large number of internal cells and has predetermined sound absorbing characteristics based on its porous structure. As the porous material of the sound absorbing material 2, foamed polyurethane may be used.

  The band member 3 is formed in a band shape and is formed in an annular shape so as to continuously extend in the tire circumferential direction. The band member 3 holds the sound absorbing material 2 on the tire inner surface based on the elastic restoring force. The noise reduction device 1 configured as described above is detachable from a normal pneumatic tire T, and the attachment / detachment work is easy. In this invention, the heat insulation layer 4 which provides the heat insulation effect to this band member 3 is provided in the outer surface side (tire outer peripheral surface side) of this band member 3.

  In the noise reduction device 1, it is practical to use heat fusion as the fixing means for the sound absorbing material 2 and the band member 3 if both of them are thermoplastic synthetic resin, and heat fusion is possible. Therefore, it is important that the band member 3 is made of a thermoplastic resin because of good moldability and the like.

  As a merit of adopting heat fusion, in particular, an ultrasonic welder is used from above the fixing member 5 by using a plate-like fixing member 5 (fixing plate or fixing chip) made of thermoplastic resin. The vibration absorbing horn (not shown) is pressed against the fixing member 5 to thermally deform the fixing member 5 and the sound absorbing material 2, while the sound absorbing material 2, the band member 3, and the fixing member 5 May be able to fix the four members including the heat insulating layer 4 to each other by hot melt bonding.

  In the above description, the heat insulating layer 4 has an adhesive layer on at least one surface of the band member 3 side, and is configured so that the heat insulating layer 4 can be easily adhered to the band member 3. However, the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer may have a problem in terms of heat resistance. It is best to fix them together by hot melt bonding.

  4 (a) and 4 (b), the small-sized fixing plate 5 is bent in a "V-shape" at the necessary points in the tire circumferential direction. These four members are partially joined together by heat melting. The heat insulating layer 4 is preferably provided over the entire circumference, but it is important that the heat insulating layer 4 is provided at least on the outer surface of the band member 3 in the vicinity of the joining portion. The reason is that the thickness of the band member 3 may be thinner than the other parts due to the physical force at the time of joining, especially in the vicinity of the joining part, This is because it is more effective in reducing the thermal influence of the member.

  The sound absorbing material 2 is disposed between the band member 3 and a thermoplastic resin fixing member 5, and the fixing member 5 is heat-sealed to the band member 3 through the sound absorbing material 2. It is preferable that the sound absorbing material 2 maintain its volume as much as possible in terms of the sound absorbing effect, and it is preferable that the sound absorbing material 2 is joined to the band member 3 at a required place in order to maintain the volume and enhance the sound absorbing effect. . The constituent material of the fixing member 5 may be the same type of thermoplastic resin as that of the band member 3, and for example, it is preferable to use a polypropylene resin together with the band member.

  That is, in the present invention, the band member 3 and the sound absorbing material 2 are made to pass through the sound absorbing material 2 with the fixing member 5 made of the same material as the band member 3 by the ultrasonic welding method. The band member 3 is fixed by being welded and fixed to the fixing member 5 and the band member 3 in a state where the band member 3 is fixed by welding and the heat insulating layer 4 is wound around the band member 3 in the tire width direction. It is preferable to increase the overall strength of the tire noise reduction device.

  FIGS. 5A to 5C show an example of a heat fusion method between the fixing member 5 and the band member 3 when an ultrasonic welding machine is used. First, as shown in FIG. 5A, the sound absorbing material 2 is disposed between the band member 3 and a plate-like fixing member 5 made of a thermoplastic resin. In this example, the heat insulating layer 4 is disposed under the band member 3. Next, as shown in FIG. 5B, the vibration horn 9 of the ultrasonic welder was pressed against the fixing member 5, and the fixing member 5 was bent into a V shape and bent. 5 (c), the fixing member 5, the band member 3, and the heat insulating layer 4 are integrated by heat fusion, as shown in FIG. A heat fusion part 8 is formed in the integrated part, and the vibration horn 9 returns to the original position after the heat fusion part 8 is appropriately formed, and the sound absorbing material 2 and the band member. 3 and the heat-insulating layer 4 are integrally fixed, and fixing by heat fusion is considered possible by other methods without using an ultrasonic welding machine, but according to the knowledge of the present inventors. The ultrasonic welding method using an ultrasonic welder is superior to other methods in terms of the strength of the product and the processing cost. There.

  6 (a) and 6 (b) are external perspective views schematically showing an embodiment of a tire noise reduction device according to the present invention. FIG. 6 (a) shows that the sound absorbing material 2 is not present continuously over the entire circumference in the tire circumferential direction, but presents an appropriate length L in the tire circumferential direction, and is divided into a plurality. Shows what you are doing. Further, the fixing means for the sound absorbing material 2 and the band member 3 is in a state where the small-sized fixing plate 5 described in FIG. 2 is bent into a “V-shape” at a necessary place in the tire circumferential direction. An example is shown in which it is partly integrally joined and fixed. The band member 3 exists continuously over the entire circumference in the tire circumferential direction. The length L of the sound absorbing material 2 in the tire circumferential direction is preferably in the range of L = 20 cm to 50 cm, and the number of the sound absorbing materials 2 in the case of being divided and used is in the range of 3 to 7. preferable. When a plurality of sound absorbing materials are used after being divided, even if the sound absorbing material breaks down for some reason, it is excellent in that it only stops the sound absorbing material and does not reach the whole destruction. ing.

  FIG. 6 (b) shows that the sound absorbing material 2 is not present continuously over the entire circumference in the tire circumferential direction, but presents an appropriate length L in the tire circumferential direction, and is divided into a plurality. 6 is similar to FIG. 6 (a) in that the fixing means between the sound absorbing material 2 and the band member 3 is used over the entire circumference of the tire. This is a difference. In this aspect, the vibration horn of the ultrasonic welder is pressed against the fixing member at a required position in the tire circumferential direction of the fixing member (fixing plate) 5 and is partially integrated with the pressed welding portion 6. This is an example in which they are bonded together and fixed.

  Moreover, according to the knowledge of the present inventors, the heat insulation layer 4 is the aspect (FIGS. 1-2) affixed on the one surface of the outer periphery of the band member 3, or wound in the tire width direction. Although it may be in the form wrapped in the tire circumferential direction (FIGS. 3 to 4), it is spirally wound around the outer periphery of the band member 3 so as to cover the entire outer peripheral surface or most of the outer peripheral surface of the band member 3. It may be arranged. Since the heat insulating layer is arranged on almost the entire outer peripheral surface of the band member 3 while shifting the phase of the edge line of the heat insulating layer, the heat insulating layer 4 becomes more difficult to peel off, and the heat resistance characteristics and durability characteristics are greatly improved. It is. The spiral winding is best to cover the entire outer peripheral surface, but it may be a little spaced, and even in that case, the effect can be obtained. FIG. 7 shows an example in which the heat insulating layer 4 is spirally wound around the outer periphery of the band member 3 so as to cover the entire outer peripheral surface of the band member 3.

  In the present invention, the heat insulating layer preferably has a thermal conductivity (JIS A9511, (23 ° C.)) of 0.040 W / (m · k) or less in order to obtain a good heat insulating effect. More preferably, it is 0.030 W / (m · k) or less.

The heat insulating layer has a thickness of 3 to 12 mm, a density of 15 to 30 kg / m ³ , a tear strength of 6 to 10 N / cm, a tensile strength of 80 kPa or more, and a hardness of 80 to 120 N. . This is because the heat insulating layer is in contact with the inner surface of the tire, so that physical durability is also required, and it is important to satisfy the above range. Here, the density is a value measured by JIS K7222, the hardness is a value measured by JIS K6400-2D, and the tensile strength and tear strength are values measured by JIS K6400-5. In addition, the thickness of the heat insulation layer here means the thickness of the heat insulation layer between the tire inner surface and the band member (that is, about the thickness of the heat insulation layer between the band member and the sound absorbing material). Is not included in the calculation).

  Moreover, in this invention, it is preferable that a sound-absorbing material has many through-holes vacant in the tire radial direction. With this structure, the through hole exhibits a heat dissipation effect, and a high sound absorption effect with high durability can be continuously obtained over a long period of time, particularly with a tire for high speed running (for example, 300 km / hour or more).

The pneumatic tire according to the present invention has the above-described noise reduction device in the tire lumen. In the pneumatic tire of the present invention, the width W of the heat insulating layer in the tire noise reduction device satisfies the relationship between the width Wb of the band member, the maximum width Ws of the sound absorbing material, and the following formulas (a) and (b): In addition, it is preferable that the tire noise reduction device is mounted in the tire and filled with air pressure so that a space is formed between the sound absorbing material and the tire inner surface.
Thermal insulation layer width W> Band member width Wb (a) formula Thermal insulation layer width W <Sound absorbing material maximum width Ws × 0.7 (b) formula This is because the thermal insulation material extends over the entire width of the acoustical material. If it is installed, heat dissipation from the tire side to the tire lumen is hindered, leading to a high temperature of the tire, which is not preferable.

  Hereinafter, the present invention will be specifically described by way of examples.

Example 1 and Comparative Example 1
Test tires having a tire size of 275 / 35R20 100Y were prepared as test tires, and the tire noise reduction device according to the present invention (Example 1) and a heat insulating layer not according to the present invention were provided in the lumen of each test tire. A tire noise reduction device (Comparative Example 1) was installed.
In each test tire, the sound absorbing material is made of urethane foam, and as shown in FIGS. 3, 4, and 6 (a), the band member is an elastic band member that exists annularly around the tire, and the sound absorbing material A plurality of sound absorbing materials exist around the entire circumference, but are divided into a plurality of parts.

Both the locking member and the band member were made of thermoplastic resin (polypropylene resin, heat distortion temperature (18.5 kg / cm 2) (according to ASTM D648 A method) 60 ° C.).
The heat insulating layer used in Example 1 of the present invention is a foamed polyurethane foam (thickness 5 mm), a density of 26 kg / m ³ , a tear strength of 9.0 N / cm, a tensile strength of 120 kPa, and a hardness of 80 N. is there.
Bonding and integration of the sound absorbing material, the band member, and the heat insulating layer using the fixing member were performed using an ultrasonic welding machine.

Each test tire was tested for 3 hours at a traveling speed of 300 km / hour (tire pressure 270, load load 5.6 kN).
After each test run, the presence or absence of deformation of the band member of the noise reduction device in each test tire was examined. As a result, no deformation or damage was found in the tire of Example 1, but Comparative Example 1 The tire of No. 1 had deformation and elongation of the band member, which is considered to have been generated by applying tension under high heat. The deformation could be judged to cause a decrease in durability and sound absorption performance of the tire noise reduction device.

1: Tire noise reduction device 2: Sound absorbing material made of porous material 3: Elastic fixing band 4: Heat insulation layer 5: Fixing member 6: Thermal bonding portion 8: Thermal fusion portion 9: For vibration excitation of ultrasonic welder Horn 10: Tread part 11: Bead part 12: Side wall part T: Pneumatic tire w: Width of elastic fixing band

Claims (9)

For a tire having a sound absorbing material made of a porous material and a band member formed in an annular shape for mounting the sound absorbing material on the inner surface of the tire, and fixing the sound absorbing material on the inner surface side of the annular band member In the noise reduction device, the band member is made of a thermoplastic resin, a heat insulating layer is provided on the outer surface side of the annular band member, the thickness of the heat insulating layer is 3 to 12 mm, and the density is 15 to 30 kg / m ³ , a tear strength of 6 to 10 N / cm, a tensile strength of 80 kPa or more, and a hardness of 80 to 120 N, a tire noise reduction device.   The tire noise reduction device according to claim 1, wherein the heat insulating layer is also fixed to the outer surface side of the band member by means for fixing the band member and the sound absorbing material to each other. The band member and the sound absorbing material are welded and fixed by an ultrasonic welding method so that an engaging member made of the same material as the band member is penetrated to penetrate the sound absorbing material. have been, and the wherein the heat insulating layer is fixed to the periphery of the band members in a state of being wound Kai in the tire width direction, accompanied by the welding fixation of the engaging member and the band member The tire noise reduction device according to claim 1 or 2. The tire noise reduction device according to any one of claims 1 to 3, wherein the heat insulating layer is spirally arranged around the band member.   The tire noise reduction device according to any one of claims 1 to 4, wherein the heat insulating layer has a thermal conductivity of 0.040 W / (m · k) or less. The tire noise reduction device according to any one of claims 1 to 5 , wherein the sound-absorbing material has a large number of through holes vacated in a tire radial direction. A pneumatic tire comprising the tire noise reduction device according to any one of claims 1 to 6 in a tire lumen. The width W of the heat insulation layer in the tire noise reduction device satisfies the relationship between the width Wb of the band member, the maximum width Ws of the sound absorbing material, and the following formulas (a) and (b): noise reducing device for a tire is attached to the tire in a state in which air pressure is filled, according to claim 7, characterized by comprising configured to space is formed between the sound absorbing member and the inner surface of the tire Pneumatic tires.
Thermal insulation layer width W> band member width Wb (a) formula Thermal insulation layer width W <sound absorber maximum width Ws × 0.7 (b) formula For a tire having a sound absorbing material made of a porous material and a band member formed in an annular shape for mounting the sound absorbing material on the inner surface of the tire, and fixing the sound absorbing material on the inner surface side of the annular band member In a pneumatic tire provided with a noise reduction device in the tire lumen,
The band member is made of a thermoplastic resin, a heat insulating layer is provided on the outer surface side of the annular band member, and the width W of the heat insulating layer in the tire noise reduction device is the width Wb of the band member, the sound absorption In the state where the relationship between the maximum width Ws of the material and the following formulas (a) and (b) is satisfied and the tire noise reduction device is mounted in the tire and filled with air pressure, A pneumatic tire characterized in that a space is formed between the inner surface of the tire.
Insulation layer width W> band member width Wb (a) formula
Thermal insulation layer width W <Sound-absorbing material maximum width Ws × 0.7 (b) formula

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