Noise-reducing pneumatic tire and method for manufacturing the same

Abstract

The present invention relates to a noise-reducing pneumatic tire and a method for manufacturing the same, and more particularly to a noise-reducing pneumatic tire that has improved sound absorption performance and can be stably mounted, and a method for manufacturing the same. [Solution] The noise-reducing pneumatic tire of the present invention comprises an inner liner for a pneumatic tire and a sound-absorbing structure attached to the inner liner. The sound-absorbing structure has a configuration that includes a sound-absorbing body attached to the inner surface of the inner liner along the circumferential direction of the pneumatic tire, and a through hole formed in the sound-absorbing body, which allows a sensor to be placed inside.

Description

【Technical Field】 【0001】 The present invention relates to a noise-reducing pneumatic tire and a method for manufacturing the same, and more particularly to a noise-reducing pneumatic tire with improved sound absorption performance and capable of being stably attached, and a method for manufacturing the same. 【Background Art】 【0002】 In a vehicle equipped with pneumatic tires, noise caused by tire deformation inevitably occurs during driving due to the contact between the tires and the road surface. To reduce this noise, automobile manufacturers and tire manufacturers have pasted porous structures such as polyurethane foam inside the tires or inside the wheels to reduce noise. 【0003】 However, in the case of a structure directly pasted on the tire among these noise-reducing structures, it causes a weight increase of several hundred grams per tire, and there is a problem that heat generated at the interface between the inner liner and the structure accumulates and the temperature further rises. Especially during high-speed driving, the risk of tire damage increases due to heat generation, which may threaten the safety of passengers. 【0004】 Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 10-2021-0099124, when a noise-reducing structure is pasted on a tire provided with a sensor container at a distance, the adhesive force at the end is insufficient, and the structure may fall off. Also, due to such a heat generation phenomenon, voids may occur in the adhesive layer of the sensor container attached with an adhesive, and the sensing accuracy may decrease. 【0005】 Hereinafter, related prior art documents will be described. Note that the reference numerals in the documents have no relation to the present invention. 【0006】 Korean Registered Patent No. 10-1775797, "Tire Sound-Absorbing Material Fixing Structure with Sound-Absorbing Material Fixing Bands and Tire Manufactured Including the Same," relates to a tire sound-absorbing material fixing structure for attaching and fixing sound-absorbing material to a tire, and a method for manufacturing the same. More specifically, it consists of a sound-absorbing material for reducing noise generated inside the tire, a coupling part made of an expandable material that connects to the inner surface of the tire, and a pressurizing part that has the function of making the sound-absorbing material adhere tightly to the inner liner of the tire and maintaining that adherence. 【0007】 The present invention provides a sound-absorbing material fixing structure that applies downward pressure to the upper surface of the sound-absorbing material while the pressurizing section expands and contracts, eliminating the need to apply a separate adhesive layer, thereby simplifying the installation process of the sound-absorbing material, and also having the advantage of securely fixing the sound-absorbing material to the inner surface of the tire without damaging the tire. However, this technology had a problem in that minute vibrations occurred during the pressurizing and contracting process, resulting in excessive heat generation at the contact surface with the inner liner. 【0008】 Korean Published Patent No. 10-2021-0022383, "Tire Including a Sealant Layer and a Sound-Absorbing Material Layer," relates to a tire comprising a sealant layer and a sound-absorbing material layer, and more specifically, to a tire comprising a sound-absorbing material layer attached to the inner surface of the tire, and a sealant layer disposed between the inner surface of the tire and the sound-absorbing material layer, wherein the sound-absorbing material layer includes a nonwoven fabric. However, this technology had the problem that the attachment of the sound-absorbing material layer was not easy and excessive heat was generated at the contact surface with the inner liner. [Prior art documents] [Patent Documents] 【0009】 [Patent Document 1] Korean Published Patent No. 10-2021-0099124, "Method for Manufacturing a Tire Equipped with a Sensor Container and a Tire Manufactured by the Method," Publication Date: February 7, 2023 [Patent Document 2] Korean Registered Patent No. 10-1775797: "Tire sound-absorbing material fixing structure with sound-absorbing material fixing band and tire manufactured including the same." Registration date: August 31, 2017. [Patent Document 3] Korean Published Patent No. 10-2021-0022383 "Tire Including a Sealant Layer and a Sound-Absorbing Material Layer" Publication Date: March 3, 2021 [Patent Document 4] Japanese Patent Publication No. 06838629, "Pneumatic Tire," Registration Date: February 16, 2021 [Overview of the Initiative] [Problems that the invention aims to solve] 【0010】 The technical problem that the present invention aims to solve is to provide a noise-reducing pneumatic tire with improved sound absorption performance and stable mounting capabilities, as well as a method for manufacturing the same. Furthermore, the technical problems that the present invention aims to solve are not limited to those described above, and other technical problems not mentioned herein will be obvious to those skilled in the art from the following description of this specification. [Means for solving the problem] 【0011】 The noise-reducing pneumatic tire of the present invention comprises an inner liner for the pneumatic tire and a sound-absorbing structure attached to the inner liner. The sound-absorbing structure includes a sound-absorbing body attached to the inner surface of the inner liner along the circumferential direction of the pneumatic tire, and a through hole formed in the sound-absorbing body that allows a sensor to be placed inside. 【0012】 In embodiments of the present invention, the sound-absorbing body may be made of a porous material and its thickness may be set to 5 to 50 mm. 【0013】 In embodiments of the present invention, the through-hole may be set to have a diameter that is 20 to 400% of the thickness of the sound-absorbing body. 【0014】 In one embodiment of the present invention, the through hole may be disposed at a position where its center coincides with the center line in the width direction of the sound absorbing body. 【0015】 In one embodiment of the present invention, the through hole may be formed so that its center is disposed at a position 1 to 30% with respect to the width dimension of the sound absorbing body from the center line in the width direction of the sound absorbing body. 【0016】 In one embodiment of the present invention, the through hole may be formed such that the upper diameter on the opposite side is 1 to 30% larger than the lower diameter located on the inner liner side. 【0017】 In one embodiment of the present invention, the sound absorbing structure may further include auxiliary through holes formed in the sound absorbing body and provided at positions where no sensor is disposed. 【0018】 In one embodiment of the present invention, a plurality of the auxiliary through holes may be formed and arranged at predetermined intervals along the longitudinal direction of the sound absorbing body. 【0019】 In one embodiment of the present invention, a plurality of the auxiliary through holes may be formed and arranged at predetermined intervals along the width direction of the sound absorbing body. 【0020】 In one embodiment of the present invention, the sound absorbing structure may be adhered to the inner surface of the inner liner in a ring shape continuous along the circumferential direction of the inner liner, and a plurality of through holes may be formed so as to correspond to a plurality of sensors arranged in the inner liner. 【Effects of the Invention】 【0021】 According to the present invention, in a pneumatic tire provided with a sensor container for mounting a sensor, the sensor insertion container portion can be integrated with the inner liner without using an adhesive, and as a result, no gap occurs on the mounting surface, and the sensor can stably perform high-precision sensing during running. 【0022】 Further, by attaching the sound-absorbing structure having through-holes to the inner liner without any gaps, it is possible to reduce the noise caused by tire deformation that occurs when the tire contacts the road surface during driving, and improve the driving comfort. 【0023】 Furthermore, compared with a tire having a general sound-absorbing structure, the overall weight is reduced, so the rolling resistance is reduced, and an improvement effect on fuel efficiency can also be expected. 【0024】 In particular, according to the present invention, due to the action of the auxiliary through-holes, the accumulation of heat generated at the interface between the inner liner of the tire and the sound-absorbing structure during high-speed driving is reduced, and the tire temperature can be lowered. As a result, the stability of the sensor mounted inside the tire and its mounting surface is improved, the risk of tire damage is reduced, the durability is improved, and thus an improvement in the safety of the occupants can be expected. 【0025】 The effects of the present invention are not limited to those described above, and are understood to include all other effects that can be inferred by those skilled in the art from the configuration of the invention described in the detailed description of the present invention and the claims. 【Brief Description of the Drawings】 【0026】 [Figure 1] It is a diagram showing the state of attachment of a sound-absorbing material in a pneumatic tire described in Japanese Patent No. 06838629. [Figure 2] It is an extracted perspective view showing the structure of a sensor container. [Figure 3] It is a perspective view of a sound-absorbing structure according to the noise-reducing pneumatic tire of the present invention. [Figure 4] In the noise-reducing pneumatic tire of the present invention, it is a cross-sectional view of a main part showing the state where the sound-absorbing structure is attached to the inner liner. [Figure 5] In the noise-reducing pneumatic tire of the present invention, it is a cross-sectional view of a main part obtained by cutting the tire along the circumferential direction, and is a diagram showing the state of attachment of the sound-absorbing structure. [Figure 6]This figure shows the sensor container portion of the noise-reducing pneumatic tire of the present invention attached to the inner liner. [Figure 7] This figure shows an embodiment in which the through-holes of the sound-absorbing structure are arranged to correspond to the sensor container section. [Figure 8] This is a photograph showing one example of an auxiliary through-hole formed in a sound-absorbing structure. [Figure 9] This graph shows the results of a high-speed endurance driving test for the noise-reducing pneumatic tire of the present invention. [Figure 10] This is a flowchart showing the method for manufacturing a noise-reducing pneumatic tire according to the present invention. [Figure 11] This is a perspective view showing a dummy used in the present invention. (Best Mode for Carrying Out the Invention) The most preferred embodiment of the present invention comprises an inner liner for a pneumatic tire and a sound-absorbing structure attached to the inner liner. The sound-absorbing structure has a sound-absorbing body attached to the inner surface of the inner liner along the circumferential direction of the pneumatic tire, and a through hole formed in the sound-absorbing body, in which a sensor can be placed inside. [Modes for carrying out the invention] 【0027】 The present invention will be described below with reference to the attached drawings. It should be noted that the present invention can be implemented in various forms and is not limited to the embodiments shown below. Furthermore, for clarity in the drawings, parts unrelated to the description have been omitted as appropriate, and the same or corresponding parts are denoted by the same reference numerals throughout the specification. 【0028】 In this specification, when a component is described as being "connected (in contact, joined)" to another component, this includes not only cases where the components are directly connected, but also cases where they are indirectly connected via another component. Furthermore, when a configuration is described as "including" other components, unless otherwise specified, this does not exclude those other components, but rather means that it may include even more components. 【0029】 The terms used herein are for the sole purpose of describing specific embodiments and are not intended to limit the invention. Expressions written in the singular form are to be interpreted as encompassing the plural form unless the context clearly indicates otherwise. Furthermore, where terms such as "includes" or "has" are used herein, they merely indicate the existence of features, numerical values, processes, operations, components, members, or combinations thereof described in the specification, and do not preclude the existence or addition of one or more other features, numerical values, processes, operations, components, members, or combinations thereof. 【0030】 Furthermore, terms such as "~part," "~unit," and "~module" as used herein refer to a constituent unit for performing at least one function or operation, which may be realized by hardware, software, or a combination of hardware and software. 【0031】 Furthermore, in this specification, when a process is described as being "before" or "after" another process, it is interpreted to include not only cases where the process has a direct temporal relationship with the other process, but also indirect temporal relationships where the order may be altered, such as when another process intervenes between them. 【0032】 The embodiments of the present invention will be described in detail below with reference to the attached drawings. 【0033】 Figure 1 is a photograph showing the state of sound-absorbing material being attached to a pneumatic tire, as described in Japanese Patent Publication No. 06838629, which is prior art. 【0034】 When sound-absorbing structures were attached to tires equipped with sensor containers in this manner, with gaps between them, the adhesive strength at the edges was insufficient, as shown in the figure, resulting in the structure falling off. 【0035】 Furthermore, conventional pneumatic tires have a problem where noise increases because they lack sound-absorbing structures near where sensors are attached. 【0036】 However, conventionally, when sound-absorbing structures are continuously attached, it not only becomes difficult to mount sensors, but also increases heat generation. This heat generation phenomenon causes gaps to form in the adhesive layer between sensor containers attached with adhesive, leading to problems with accurate sensing. 【0037】 The configuration of the present invention will be described in detail below. 【0038】 First, Figure 2 is a perspective view of the main parts showing the structure of the sensor container. As shown in Figure 2, the tire (100) has an inner region of the tire that includes an inner liner (110) to which the container portion (120) of the sensor container can be attached. 【0039】 The container (120) is vulcanized and bonded to the tire (100), and includes a container side wall (121), a container cover (123), and a sensor insertion hole (10). 【0040】 The container side wall (121) is configured so that its lower part becomes integrated with the tire (110) during vulcanization. Specifically, the container side wall (121) may be formed with an annular bottom surface that is vulcanized and joined to the tire (100), and a side wall that extends upward from the inner end of the bottom surface in a direction substantially perpendicular to the tire (100). In this case, the container side wall (121) may be configured as a circular shape with a filled interior. 【0041】 The container side wall (121) is vulcanized while attached to the inner liner (110) of the tire (100), so that its bottom surface becomes integrated with the tire (110) and fixed in place. 【0042】 The container cover (123) extends from the upper end of the container side wall (121) and is formed to cover at least a portion of the upper part of the container side wall (121). The sensor insertion hole (10) is formed in the central part of the container cover (123) and is configured to secure a space into which a sensor will be inserted later. 【0043】 Figure 3 is a perspective view of the sound-absorbing structure in the noise-reducing pneumatic tire of the present invention, and Figure 4 is a cross-sectional view of the main part showing the state in which the sound-absorbing structure is attached to the noise-reducing pneumatic tire of the present invention. Furthermore, Figure 5 is a cross-sectional view of the main part of the tire cut along the circumferential direction to explain the state in which the sound-absorbing structure is attached to the noise-reducing pneumatic tire of the present invention. 【0044】 Figure 6 shows the state in which the container portion is attached to the inner liner in the noise-reducing pneumatic tire of the present invention. Figure 7 shows an embodiment in which the through-holes of the sound-absorbing structure are positioned to correspond to the container portion. Figure 8 shows an embodiment in which auxiliary through-holes are formed in the sound-absorbing structure. 【0045】 As shown in Figures 3 to 8, the sound-absorbing structure (200) comprises a sound-absorbing body (210), a through-hole (220), and an auxiliary through-hole (230). 【0046】 The sound-absorbing body (210) extends along the circumferential direction of the pneumatic tire (100) and is attached to cover the inner surface of the inner liner (110). In this case, the sound-absorbing body (210) may be formed to have a thickness of 5 to 50 mm. Furthermore, the sound-absorbing body (210) may be made of a porous sound-absorbing material, and may be formed to reduce weight and to dissipate heat more effectively. 【0047】 In particular, since the sound-absorbing body (210) is provided to substantially cover the remaining portion of the inner liner (110) except for the portion in which the through-hole (220) and the auxiliary through-hole (230) are formed, noise during driving can be effectively reduced. 【0048】 The through-hole (220) is formed as a through-hole in the sound-absorbing body (210) and is configured as an opening that allows a sensor to be placed inside it. 【0049】 In this embodiment, the container portion (120) is formed in a circular shape, and the through-hole (220) is also formed in a circular shape accordingly. However, the embodiment is not limited to this. Depending on the shape of the container portion (120), the through-hole (220) may be an ellipse, square, polygon, or any other shape that does not interfere with the container portion (120). 【0050】 Furthermore, if the through-hole (220) is formed in an elliptical shape, the major axis direction of the elliptical through-hole (220) can be arranged in various directions, such as the width direction of the tire, the circumferential direction, or the diagonal direction, depending on the shape and movement of the container portion (120). 【0051】 More specifically, the through-hole (220) may be formed to have a diameter of 20 to 400% of the thickness of the sound-absorbing body (210). In this case, the through-hole (220) may be set to be larger than the diameter of the container portion (120) so as to avoid interference with the container portion (120) when the sound-absorbing structure (200) is attached to the inner liner (110). Furthermore, the through-hole (220) may be positioned so that its center coincides with the widthwise centerline of the sound-absorbing body (210). 【0052】 On the other hand, considering the mounting position and size of the container portion (120) formed on the tire, as well as manufacturing convenience, the through hole (220) may be formed so as not to coincide with the widthwise centerline of the sound-absorbing body (210). Furthermore, even when the sound-absorbing body (210) is attached, the center of the through hole (220) does not necessarily have to coincide with the center of the container portion (120) and the sensor. 【0053】 Furthermore, the through-hole (220) may be formed such that its center is located at a position 1 to 30% of the width dimension of the sound-absorbing body (210) from the widthwise centerline of the sound-absorbing body (210). 【0054】 As shown in Figure 4(a), the through-hole (220) may be formed such that the diameter of the lower side attached to the inner liner (110) is the same as the diameter of the upper side. Alternatively, as shown in Figure 4(b), the upper diameter on the opposite side may be 1 to 30% larger than the lower diameter on the inner liner (110) side, thereby preventing interference between the sound-absorbing body (210) and the container section (120) or the sensor. 【0055】 The auxiliary through-hole (230) is formed in an area that does not correspond to the placement position of the container portion (120). 【0056】 The auxiliary through-holes (230) provided in this manner can be formed by combining one or more hole diameters, making it possible to more effectively dissipate the heat generated in the inner liner (110). Furthermore, the auxiliary through-holes (230) provide additional noise reduction and weight reduction effects. 【0057】 Furthermore, multiple auxiliary through-holes (230) may be formed and arranged at predetermined intervals along the longitudinal direction of the sound-absorbing body (210). That is, the auxiliary through-holes (230) are continuously provided in the interval regions of the multiple through-holes (220) formed along the longitudinal direction of the sound-absorbing body (210). 【0058】 Furthermore, the diameter and number of the auxiliary through holes (230) can be designed and formed in various ways according to the heat generation performance and sound absorption performance required for each tire. 【0059】 Furthermore, multiple auxiliary through-holes (230) may be formed and arranged at predetermined intervals along the width direction of the sound-absorbing body (210). That is, as shown in Figures 3 and 8, an embodiment is illustrated in which several auxiliary through-holes (230) are formed along the width direction of the sound-absorbing body (210), but the diameter and number of the auxiliary through-holes (230) can be designed and formed in various ways depending on the heat generation performance and sound absorption performance required for each tire. 【0060】 On the other hand, the sound-absorbing structure (200) may be attached to the inner surface of the inner liner (110) in a continuous ring shape along the circumferential direction of the inner liner (110), and may have a plurality of through holes (210) formed to correspond to a plurality of sensors provided in the inner liner (110). 【0061】 In other words, as shown in Figure 5, if three sensors are arranged on the inner liner (110), then correspondingly, three through holes 210 that penetrate the thickness of the sound-absorbing structure (200) may be formed in the sound-absorbing structure (200) which is continuously formed in the circumferential direction of the inner liner (110) inside the tire, at positions corresponding to the three sensors. 【0062】 The configuration of the continuous ring-shaped or strip-shaped sound-absorbing structure (200) and the through-holes (210) formed in the sound-absorbing structure (200) ensures that the inner liner (110) inside the tire is covered without any gaps, thus allowing the sound-absorbing structure (200) to be uniformly arranged. 【0063】 Furthermore, by providing the through-holes (210) only at the positions where the sensors are located, not only can physical interference be avoided, but heat generation can be reduced, and noise generated from the tires can be suppressed to the greatest extent possible. 【0064】 Therefore, according to the configuration of the present invention, an excellent noise reduction effect can be obtained while minimizing interference with the container portion (120) for mounting the sensor. 【0065】 (Examples) 【0066】 (1) Setting of Examples and Comparative Examples 【0067】 For the high-speed endurance driving test, a configuration without the sound-absorbing structure was used as a comparative example. Furthermore, a configuration using only general sound-absorbing material without through holes (220) and auxiliary through holes (230) was designated as Example 1, and a configuration using the sound-absorbing structure (200) of the present invention was designated as Example 2. 【0068】 (2) Results of high-speed endurance driving test 【0069】 Figure 9 is a graph showing the results of a high-speed endurance driving test using the noise-reducing pneumatic tire of the present invention. After applying a container section housing a sensor and a sound-absorbing structure inside a 235 / 40R19 96W tire, a high-speed endurance driving test was conducted. As a result, it was confirmed that, compared to the case where only a general sound-absorbing material was applied (Example 1), the amount of heat accumulated during driving was reduced to the same level as when no sound-absorbing material was applied (Comparative Example) when the sound-absorbing structure (200) according to the present invention was applied (Example 2). 【0070】 Furthermore, it was confirmed that the addition of the through-hole (220) did not negatively affect the noise reduction effect. 【0071】 In other words, according to the present invention, the accumulation of heat generated at the interface between the inner liner of the tire and the sound-absorbing structure (200) during high-speed driving is suppressed, resulting in a decrease in tire temperature and improved stability of the sensor mounted inside the tire and its mounting part. This reduces the risk of tire damage, improves durability, and enhances occupant safety. 【0072】 The manufacturing method for noise-reducing pneumatic tires, configured as described above, will be explained in more detail below. 【0073】 Figure 10 is a flowchart of the method for manufacturing a noise-reducing pneumatic tire according to the present invention. As shown in Figure 10, the present invention is a method for manufacturing a noise-reducing pneumatic tire, comprising the steps of: vulcanizing the container portion of a sensor container (S100); installing a dummy inside the vulcanized container portion (S200); attaching the container portion including the dummy to a green tire (S300); vulcanizing the green tire to which the container portion is attached (S400); degassing and removing the dummy from the container portion after vulcanization (S500); and attaching a sound-absorbing structure having through holes to the inner liner of the tire (S600). Furthermore, in step (S600), the through holes are arranged to correspond to the installation position of the container portion, which is a characteristic feature of this method for manufacturing a noise-reducing pneumatic tire. In addition, the method may optionally include a step of determining whether or not to install a sensor, and a step of inserting a sensor into the position where the dummy was removed. 【0074】 In step (S100), the container portion of the sensor container is made of a rubber-based material formed from a polymer blend containing natural rubber and synthetic rubber, and may further contain one or more of carbon, silica, and organic fillers. Furthermore, it is important to control the heating temperature and vulcanization time of the container portion so that the vulcanization progress does not reach 100%, so that sufficient chemical bonding is formed with the inner liner rubber of the green tire in the subsequent process. The heating temperature and vulcanization time may be maintained at 140 to 160°C for 100 to 500 seconds, and more preferably set to 145 to 155°C for 110 to 300 seconds. 【0075】 Figure 11 is a perspective view of a dummy applied to the present invention. In the step (S200) of installing the dummy inside the vulcanized container section, it is preferable that a hole (131) with screw threads is formed inside the dummy (130), as shown in Figure 11. The screw threads allow the dummy (130) to be easily removed later using a rod-shaped extraction means with corresponding screw threads. As such, machining or injection molding methods can be more preferably applied as the manufacturing method for the dummy. In particular, in the case of injection molding, the shape can be completed by manufacturing two or more separate molds and integrating them. Methods such as bonding, heat welding, and ultrasonic welding are more preferable for this integration. 【0076】 In the process (s300) in which the container section including the dummy is attached to the green tire, the pressure applied for the attachment of the container section is 0.01 to 10 kg / cm². 2 It is preferable to attach it in this way. 【0077】 The attached container section, due to its strong adhesion to the inner liner rubber of the green tire, does not detach during the transport of the green tire, and the adhesion is maintained until the tire is vulcanized. 【0078】 On the other hand, 0.01 kg / cm³ 2 If the following pressures are applied, the adhesion may be insufficient, and the container portion may detach during the transport of the green tires. If the container portion detaches, there is a risk of damaging the equipment used for transporting tires between processes or the vulcanizing machine. Also, 10 kg / cm 2 Applying pressure exceeding this limit may cause the shape of the green tire to deform, and therefore, limiting the pressure to this value has technical significance. 【0079】 In the process of vulcanizing the green tire to which the container section is attached (s400), the tire vulcanization process can be carried out under the same conditions as for a normal tire without the container section attached. In the process of removing the dummy from the container section (s500), if the dummy is manufactured using a conventional casting method, it may be difficult to create additional shapes inside the dummy, which could make the removal process difficult. 【0080】 To solve the above-mentioned problems, the present invention provides a hole with a screw thread inside the dummy, thereby allowing the dummy to be easily removed. More preferably, machining or injection molding can be applied as the manufacturing method for the dummy, and the removed dummy can be reused. 【0081】 In the step (s600) of attaching the sound-absorbing structure having the through holes to the inner liner of the tire, the sound-absorbing structure (200) can be attached to the inner liner (110). The sound-absorbing structure (200) is provided so as to cover the inner surface of the inner liner (110), effectively reducing noise, and the through holes (220) and auxiliary through holes (230) allow heat to dissipate, thus maintaining a good state of attachment. 【0082】 Furthermore, as described above, the container portion (120) may be formed to be vulcanized and integrated with the tire at the same time as the tire during the tire manufacturing process. In other embodiments, the container portion (120) may be bonded to the inner liner (110) of the tire by an appropriate method or attached using an adhesive. 【0083】 The description of this invention is illustrative and based on limited drawings, and is not intended to unduly limit the invention. It will be obvious to those skilled in the art that the invention can be easily modified into various specific forms without departing from the technical idea or essential features. Therefore, the embodiments described above are merely illustrative and do not limit the invention in any way. For example, elements described as being integrally configured may be configured separately, and conversely, elements described separately may be integrated. Also, the described steps may be carried out in an order different from the order in which they are described. 【0084】 The examples and accompanying drawings described herein are intended to illustrate only a part of the technical concept of the present invention. Therefore, the scope of the present invention is defined by the claims described below, and any modifications or variations derived from the claims and their equivalents should be interpreted as being within the scope of the present invention. [Explanation of symbols] 【0085】 10 …… Sensor insertion hole 100... pneumatic tires 110... Inner liner 120... Container section 121... Container side wall 123... Container lid 130... Dummy 131... Female thread 200... Sound-absorbing structures 210... Sound-absorbing unit 220 …… Through hole 230 …… Auxiliary through hole

Claims

[Claim 1] The inner liner of a pneumatic tire, The inner liner is fitted with a sound-absorbing structure, The sound-absorbing structure is A sound-absorbing body is attached to the inner surface of the inner liner along the circumferential direction of the pneumatic tire, The sound-absorbing body has a through-hole formed therein in which a sensor can be positioned, A noise-reducing pneumatic tire characterized by having the following features. [Claim 2] In the noise-reducing pneumatic tire according to claim 1, The sound-absorbing body is, A noise-reducing pneumatic tire characterized by being composed of a porous material with a thickness set to 5 to 50 mm. [Claim 3] In the noise-reducing pneumatic tire according to claim 1, The aforementioned through hole is A noise-reducing pneumatic tire characterized by being formed to have a diameter of 20 to 400% of the thickness of the sound-absorbing body. [Claim 4] In the noise-reducing pneumatic tire according to claim 1, The center of the through hole is A noise-reducing pneumatic tire characterized by its alignment with the widthwise centerline of the sound-absorbing body. [Claim 5] In the noise-reducing pneumatic tire according to claim 1, The center of the through hole is A noise-reducing pneumatic tire characterized in that the sound-absorbing body is positioned at a location 1 to 30% of the width dimension of the sound-absorbing body from the widthwise centerline of the sound-absorbing body. [Claim 6] In the noise-reducing pneumatic tire according to claim 1, The aforementioned through hole is Whether the lower diameter and upper diameter attached to the inner liner are the same, Alternatively, a noise-reducing pneumatic tire characterized in that the upper diameter is 1 to 30% larger than the lower diameter to which the inner liner is attached. [Claim 7] In the noise-reducing pneumatic tire according to claim 1, The sound-absorbing structure is A noise-reducing pneumatic tire, further comprising an auxiliary through-hole formed in the sound-absorbing body and provided at a position where the sensor is not located at the bottom. [Claim 8] In the noise-reducing pneumatic tire according to claim 7, Multiple auxiliary through holes are formed, A noise-reducing pneumatic tire characterized by having the sound-absorbing body arranged at predetermined intervals along the longitudinal direction of the sound-absorbing body. [Claim 9] In the noise-reducing pneumatic tire according to claim 7, Multiple auxiliary through holes are formed, A noise-reducing pneumatic tire characterized by being arranged at predetermined intervals along the width direction of the sound-absorbing body. [Claim 10] In the noise-reducing pneumatic tire according to claim 1, The sound-absorbing structure is A noise-reducing pneumatic tire characterized by having an annular structure attached to the inner surface of the inner liner in a continuous manner along the circumferential direction of the inner liner. [Claim 11] In the noise-reducing pneumatic tire according to claim 1, The sound-absorbing structure is A noise-reducing pneumatic tire characterized by having multiple through holes formed to correspond to multiple sensors arranged in the inner liner.

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