JP2015209173A - Noise reduction device for tire and pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise reduction device for a tire that, even in high speed travelling such as 300 km per hour or more of a vehicle equipped with tires for high-speed travelling, can suppress a band member from being plastically deformed due to heat of the tires and exhibit sufficiently a noise reduction function even during the high speed travelling, and a pneumatic tire comprising the noise reduction device.SOLUTION: A noise reduction device for a tire comprises a sound absorption material formed of a porous material and a band member for attaching the sound absorption material to the inner surface of the tire, where the band member is constituted of thermoplastic resin and a heat-proof reinforcement layer is provided on at least one part in a tire circumferential direction of the band member.

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 a ring shape and installed in its entirety. The sound absorbing material is urged so as to be pressed toward the surface, and the sound absorbing material is held (claim of Patent Document 1, 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 that can sufficiently exhibit a noise reduction function even under such high-speed traveling, and a pneumatic tire including the noise reduction device.

The tire noise reduction device of the present invention that achieves the above-described object has the following configuration (1).
(1) In 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, the band member is made of a thermoplastic resin, and the band member On the other hand, a tire noise reduction device characterized in that a heat-resistant reinforcing layer is provided at least partially in the tire circumferential direction.

The tire noise reduction device of the present invention preferably has any one of the following configurations (2) to (7).
(2) The sound absorbing material and the band member are partially fixed together by partial bonding between the two, and the heat-resistant reinforcing layer is at least attached to the band member in the vicinity of the bonding portion. The tire noise reduction device according to (1), wherein the tire noise reduction device is provided.
(3) The noise reduction for a tire according to (1), wherein the band member is provided over the entire circumference in the tire circumferential direction, and the heat-resistant reinforcing layer is provided over the entire circumference. apparatus.
(4) The heat-resistant reinforcing layer is a resin sheet having a heat distortion temperature (18.5 kg / cm 2) (according to ASTM D648 A method) of 130 ° C. or higher. The tire noise reduction device according to any one of the above.
(5) the total sectional area of the band member and the heat-resistant reinforcing layer is 10 to 80 mm ^2, the longitudinal direction) (N / mm in the sectional area (mm ²⁾⁾ and the tensile modulus at 100 ° C. (member ² ) The tire noise reduction device according to any one of (1) to (4) above, wherein the total product is 500 N or more.
(6) The tire noise reduction device according to any one of (1) to (5), wherein the heat resistant reinforcing layer is spirally arranged on an outer periphery of the band member.
(7) The sound absorbing material, the band member, and the engaging member are at least provided by welding the engaging member formed of the same material as the band member and the band member with the sound absorbing material interposed therebetween. The tire noise reduction device according to any one of (1) to (6) above, wherein the tire noise reduction device is integrally fixed at a welding location.

The pneumatic tire of the present invention has the following configuration (8).
(8) A pneumatic tire, wherein the tire noise reduction device according to any one of (1) to (6) is mounted in a tire lumen space by the band member.

  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.

  According to the tire noise reduction device of the present invention according to any one of claims 2 to 7, the tire noise reduction device of the present invention having more clearly the effect of the present invention according to claim 1 described above is realized. it can.

  According to the pneumatic tire concerning this invention concerning Claim 8, the pneumatic tire equipped with the noise reduction device for tire concerning the present invention concerning any one of above-mentioned Claims 1-7 is provided, speed of 300 km or more, etc. Even when the vehicle is traveling at a high speed, a pneumatic tire that can suppress plastic deformation of the band member due to the heat of the tire and exhibits a noise reduction function with good durability is provided.

1 is an external perspective view schematically showing an embodiment of a tire noise reduction device according to the present invention. (A) is a fragmentary perspective view of the essential part of the embodiment of the pneumatic tire according to the present invention in which the tire noise reduction device according to the present invention is mounted in a tire lumen, (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. (A), (b) shows the engagement state of the sound-absorbing material, the band member and the heat-resistant reinforcing layer in the tire noise reduction device according to the present invention, (a) is a tire circumferential cross-sectional view, (B) is a sectional view in the tire width direction. 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 the tire noise reduction device 1 provided with the band member 3, the band member 3 is made of a thermoplastic resin, and the heat resistant reinforcing layer 4 and the heat resistant reinforcing layer are disposed on the tire member around the band member 3. It is characterized by being provided at least in part in the direction.

  By providing the heat-resistant reinforcing layer 4 at least partially on the circumferential direction of the tire with respect to the band member 3 made of thermoplastic resin in this way, it can run at an extremely high speed of, for example, 300 km / hour or more. Even when the sound-absorbing material 2 made of a porous material is applied to a tire, it becomes difficult for heat generated by the heat generation of the tire to be transmitted to the band member 3, and the resin constituting the band member 3 is suppressed from being softened by heat, As a result, by suppressing the plastic deformation (elongation) of the band member 3, the tire noise reduction device 1 has good durability, and can sufficiently exhibit the noise reduction function. A noise reduction device 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). The heat-resistant reinforcing layer 4 is used for reinforcing the band member 3 so as to withstand tension without reducing the high durability property against repeated bending deformation, and for effectively giving the band member 3 heat resistance. It is preferable to provide the heat resistant reinforcing layer 4 on the outer peripheral side of the member 3 (FIG. 1). However, since the effect is recognized by providing it on the inner peripheral side, it may be provided on the outer peripheral side and / or the inner peripheral side. In addition, since the band member 3 is made of a thermoplastic resin, the heat resistant reinforcing layer 4 may be provided therein, and in that case, a sandwich structure having the heat resistant reinforcing layer 4 therein is provided. It will be a thing.

  A more preferable aspect of the band member 3 is that, from the viewpoint of durability, the band member 3 main body is made of polypropylene resin, the heat-resistant reinforcing layer is made of a resin sheet, and at least one surface of the resin sheet (heat-resistant reinforcing layer). It is preferable to have an adhesive layer on the top and to be configured so that the band member 3 can easily adhere to the heat-resistant reinforcing layer. The adhesive layer is preferably an acrylic or rubber adhesive from the viewpoint of heat resistance.

  The heat-resistant reinforcing layer 4 is preferably installed by winding the outer periphery of the band member one or more times in order to obtain the effect of the present invention. Further, the heat resistant reinforcing layer may be provided with respect to the entire width of the band member (w in FIG. 1). However, since the effect is not necessarily the full width, the width may not necessarily be the full width. The width of the property reinforcing layer is preferably (0.5 to 1) × w, and is preferably provided so that the band member and the center line coincide with each other.

  Further, the sound absorbing material 2 and the band member 3 are partially fixed integrally by partial bonding between the two, and a heat-resistant reinforcing layer is provided at least on the band member near the bonding portion. It is preferable that The reason why they are partially fixed together is that it is best to maintain the durability for a long time if there is some degree of freedom of movement between them, and at least near the joint. It is preferable that a heat-resistant reinforcing layer is provided for the band member, particularly in the vicinity of the joining portion, because the thickness of the band member is thinner than other parts due to physical force during joining. This is because providing a heat-resistant reinforcing layer in the vicinity thereof can provide a greater reinforcing effect / improvement effect.

  In general, the band member is preferably provided over the entire circumference in the tire circumferential direction in order to obtain a sound absorbing material retaining effect permanently and highly. In order to obtain the effect of the present invention more effectively, it is preferable that the heat resistant reinforcing layer is provided.

FIG. 2 shows a pneumatic tire according to the present invention which is a preferred embodiment described above.
In FIG. 2, 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 the present invention, the heat resistant reinforcing layer 4 is provided at least in part in the tire circumferential direction with respect to the band member 3, and the band member 3 and the heat resistant reinforcing layer 4 are provided with respect to the band member 3. Since they are basically reinforced, it is preferable that the two are joined together substantially integrally.

  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. And as a merit of adopting heat fusion, especially using a plate-like locking member 5 (locking plate or locking chip) made of thermoplastic resin, from above the locking member 5, for example, A vibration horn (not shown) of an ultrasonic welder is pressed against the locking member 5 to thermally deform the locking member 5 and the sound absorbing material 2, while the sound absorbing material 2, the band member 3, and further locked. There is a point that the three members 5 can be melted and bonded.

  The structural model is shown in FIGS. 2 (a) and 2 (b). FIG. 2B is an enlarged view of the main part of FIG. 2A. In FIG. 2, the small-sized locking plate 5 is bent into a “V-shape” at a required place in the tire circumferential direction. The above four are partially integrated and joined together by heat melting. It is preferable that the heat resistant reinforcing layer 4 is provided at least with respect to 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 other parts due to physical force during the joining, particularly in the vicinity of the joint, and the heat-resistant reinforcing layer 4 may be provided in the vicinity thereof. This is because the reinforcement effect and the improvement effect can be obtained more greatly.

  The sound absorbing material 2 is disposed between the band member 3 and the locking member 5 made of thermoplastic resin, and the locking 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. . As a constituent material of the locking member 5, it is preferable to use the same kind of thermoplastic resin as that of the band member 3. For example, it is preferable to use polypropylene resin together with the band member.

  3A to 3C show an example of a heat fusion method between the locking member 5 and the band member 3 in the case where an ultrasonic welding machine is used. First, as shown in FIG. 3A, the sound absorbing material 2 is disposed between the band member 3 and a plate-like locking member 5 made of a thermoplastic resin. A heat-resistant reinforcing layer 4 is disposed below the band member 3. Next, as shown in FIG. 3 (b), the vibration horn 9 of the ultrasonic welder is pressed against the locking member 5, and the locking member 5 is bent into a "V" shape. As shown in Fig. 3 (c), the front end portion thus obtained is locally heated, and the locking member 5, the band member 3, and the heat-resistant reinforcing layer 4 are bonded by heat fusion through the sound absorbing material 2. The integrated portion is formed with a heat-sealed portion 8. The vibration horn 9 is appropriately formed with the heat-bonding portion 8, and then returns to its original position to absorb sound. The material 2 and the band member 3 are integrally fixed.

  In the present invention, the “heat-resistant reinforcing layer” provided on the band member means that the heat-resistant deformation temperature (ASTM D648 heat-resistant temperature (continuous)) of the reinforcing layer is higher than the heat-resistant deformation temperature of the band member. . Generally, the heat-resistant reinforcing layer is a resin sheet having a heat-resistant deformation temperature (ASTM D648 heat-resistant temperature (continuous)) of 130 ° C. or higher, or a woven fabric made of resin fibers, which can exhibit heat-resistant characteristics well. This is preferable. More preferably, the resin sheet has a heat-resistant deformation temperature (ASTM D648 heat-resistant temperature (continuous)) of 140 ° C. or higher.

  The resin sheet constituting the heat-resistant reinforcing layer is not particularly limited as long as it has the above-mentioned heat-resistant characteristics in relation to the heat-resistant deformation temperature of the band member, but is preferably a resin film. As a kind of resin, a polyimide resin (the heat-resistant deformation temperature is 300 ° C. or more) or a polyphenylene sulfide resin (the heat-resistant deformation temperature is around 260 ° C.) is preferable, and a resin film sheet in which these resin components are blended. Is preferred. The thickness of the resin sheet is preferably in the range of 10 μm to 200 μm because the heat resistance can be exhibited well and the reinforcing effect can be enhanced.

  Further, the woven fabric made of resin fibers constituting the heat-resistant reinforcing layer is preferably a PET resin (the heat-resistant deformation temperature is around 240 ° C.) fiber woven fabric, and the thickness is preferably 0.1 to 0.5 mm. Incidentally, when PET resin is used as a band member, the thickness must be set to about 1.0 mm in order to withstand tension, but in that case, durability against repeated bending is generally insufficient. When the thickness is within the range of 0.1 to 0.5 mm, there is no problem in durability (because it is thin). Therefore, using a PP resin as the band member and using a highly heat-resistant PET woven fabric as the heat-resistant reinforcing layer is an excellent combination in that both repeated bending durability and strength in a high-temperature environment can be achieved.

  4 (a) and 4 (b) are external perspective views schematically showing an embodiment of a tire noise reduction device according to the present invention. FIG. 4 (a) shows that the sound absorbing material 2 does not exist 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 has a state in which the small-size locking 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. 4 (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. 4 is similar to FIG. 4A in that the fixing means for the sound absorbing material 2 and the band member 3 is used over the entire circumference of the tire. It is different in that there are. In this aspect, the vibration horn of the ultrasonic welder is pressed against the locking member at a required position in the tire circumferential direction of the locking member 5 and is partially integrally joined by the pressed welding portion 6. This is an example of being fixed.

  FIGS. 5A and 5B schematically show typical examples of the engagement state of the sound absorbing material, the band member 3 and the heat-resistant reinforcing layer 4 in the tire noise reduction device according to the present invention. (A) is in the embodiment shown in FIG. 2 and FIG. 4 (a), and shows a section in the tire circumferential direction and the vicinity of the locking member 5. FIG. (B) is a cross-sectional view in the tire width direction, showing an engaged state of the band member 3 and the heat-resistant reinforcing layer 4 (the sound absorbing material is not shown). The length in the tire width direction of the heat-resistant reinforcing layer 4 does not have to be the same as that of the band member and may be about 0.5 to 1 times.

According to the knowledge of the present inventors, in order to obtain the effect of the present invention satisfactorily, the total cross-sectional area in the cross section in the tire width direction of the band member 3 and the heat-resistant reinforcing layer 4 is 10 to 80 mm ^2. The sum of the products of the cross-sectional area (mm ² )) and the tensile modulus of elasticity at 100 ° C. (longitudinal direction of the member) (N / mm ² ) is preferably 500 N or more. Here, the tensile modulus at 100 ° C. (longitudinal direction of the member) is in accordance with JIS 7161. More preferably, the total value of the products of the respective cross-sectional areas (mm ² ) and the tensile elastic modulus at 100 ° C. (longitudinal direction of the member) (N / mm ² ) is 600 N or more.

  Further, according to the knowledge of the present inventors, the heat-resistant reinforcing layer 4 may be in the form of being attached to one surface of the outer periphery of the band member 3 in a plate shape (FIGS. 1 to 5), but the band member 3 may be arranged so as to be spirally wound around the outer periphery of the band member 3 so as to cover the entire outer peripheral surface 3 or most of the outer peripheral surface. This is because by disposing the heat resistant reinforcing layer on almost the entire outer peripheral surface of the band member 3, the heat resistant reinforcing layer 4 is hardly peeled off, and the heat resistance characteristics and durability characteristics are remarkably improved. 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. 6 shows an embodiment in which the heat-resistant reinforcing 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.

  Further, as a specific structure of the tire noise reduction device, the sound absorbing material 2 is formed by welding the engagement member 5 formed of the same material as the band member 3 and the band member 3 with the sound absorbing material 2 interposed therebetween. It is preferable that the band member 3 and the engagement member 5 have a structure in which the band member 3 and the engagement member 5 are integrally fixed at least at the welding location because the overall strength and heat resistance are higher. In particular, this fixing method can be realized with the structure shown in FIGS. 2, 3, 4, and 5. However, in this fixing method, the band member of the welded portion becomes thin, so that it is durable. This is because the effect of the present invention can be obtained more greatly.

  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-resistant reinforcing layer not according to the present invention were provided in the lumen of each test tire. A tire noise reduction device (Comparative Example 1) that was not used was attached.

  In each of the test tires, the sound absorbing material is made of urethane foam, and as shown in FIGS. 2 and 4 (a), the band member is an elastic band member that exists in an annular shape around the entire circumference of the tire. The sound absorbing material is present over the entire circumference, but is divided into a plurality of parts.

  Both the locking member and the band member were made of thermoplastic resin (polypropylene resin, heat-resistant deformation temperature (ASTM D648 heat-resistant temperature (continuous) 60 ° C.). The heat-resistant reinforcing layer used in the product of Example 1 of the present invention was Then, a polyimide resin film sheet (thickness 30 μm) was formed, and the band-shaped resin film sheet having the same width as the band member was bonded to the band member with an acrylic resin adhesive.

  The joining and integration of the sound absorbing material and the band member using the locking member were performed using an ultrasonic welding machine.

  The test of each test tire was a continuous running of k3 hours at a running 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-resistant reinforcing layer 5: Locking member 6: Thermal bonding portion 8: Thermal fusion portion 9: Ultrasonic welding machine Excitation horn 10: tread part 11: bead part 12: sidewall part T: pneumatic tire w: width of elastic fixing band

Claims (8)

  In 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, the band member is made of a thermoplastic resin, and the band member A tire noise reduction device comprising a heat-resistant reinforcing layer at least partially in the tire circumferential direction.   The sound absorbing material and the band member are partially fixed together by partial bonding between the two, and the heat-resistant reinforcing layer is provided at least for the band member near the bonding portion. The tire noise reduction device according to claim 1, wherein the tire noise reduction device is a tire noise reduction device.   The tire noise reduction device according to claim 1 or 2, wherein the band member is provided over the entire circumference in the tire circumferential direction, and the heat-resistant reinforcing layer is provided over the entire circumference.   The tire noise reduction device according to any one of claims 1 to 3, wherein the heat-resistant reinforcing layer is a resin sheet having a heat-resistant deformation temperature (ASTM D648 heat-resistant temperature (continuous)) of 130 ° C or higher. . The total cross-sectional area of the band member and the heat-resistant reinforcing layer is 10 to 80 mm ^2, the respective cross-sectional area (mm ²⁾⁾ and the tensile modulus at 100 ° C. (longitudinal members) (N / mm ²⁾ The tire noise reduction device according to any one of claims 1 to 4, wherein a sum of products is 500 N or more.   The tire noise reduction device according to any one of claims 1 to 5, wherein the heat-resistant reinforcing layer is spirally arranged on an outer periphery of the band member.   The sound absorbing material, the band member, and the engaging member are at least at the welding location by welding the band member and an engaging member formed of the same material as the band member with the sound absorbing material interposed therebetween. The tire noise reduction device according to any one of claims 1 to 6, wherein the tire noise reduction device is integrally fixed.   A pneumatic tire, wherein the tire noise reduction device according to any one of claims 1 to 6 is mounted in a tire lumen space by the band member.

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