Pneumatic tire, method for repairing perforation of pneumatic tire, and vehicle

Abstract

The invention relates to a pneumatic tire, a method for repairing a perforation of the pneumatic tire, and a vehicle. The repair performance of the perforation is maintained in a pneumatic tire having a porous silencer in the tire cavity. A pneumatic tire according to the present invention is attached to a vehicle provided with a puncture repair kit containing a puncture sealant, and can perform puncture repair by injecting the puncture sealant into the tire. This pneumatic tire is provided with: a pneumatic tire main body (1A) that defines a tire cavity (1B); and a porous sound deadening body (10) that is disposed in the tire cavity (1B). The silencer (10) is not fixed to the pneumatic tire body (1A) in the tire inner cavity (1B) but can be detached from the pneumatic tire body (1A). The air permeability of the sound deadening body (10) as measured in accordance with JIS K6400-7 is 27 ml / cm2 / s or less.

Description

Technical Field

[0001] The present invention relates to a pneumatic tire, a puncture repair method of a pneumatic tire, and a vehicle. Background Art

[0002] A pneumatic tire having a porous silencer fixed to the inner surface of a tread portion is proposed in Patent Document 1 listed below. This pneumatic tire is expected to improve the noise reduction effect by the silencer.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2022-069984

[0004] In recent years, when a pneumatic tire is punctured, a puncture repair kit that can inject a puncture sealant into the tire inner cavity to repair the hole in the tire has become popular. In addition, in a vehicle, the number of vehicles equipped with the puncture repair kit instead of a spare tire has increased.

[0005] When the pneumatic tire including the porous silencer is repaired using the puncture repair kit, the silencer may prevent the puncture sealing agent from flowing into the puncture, thereby impairing the puncture repairability. Summary of the invention

[0006] The present invention has been made in view of the above-mentioned actual situation, and a main object of the present invention is to maintain the repairability of a puncture in a pneumatic tire or the like having a porous silencer in the inner cavity of the tire.

[0007] The pneumatic tire of the present invention is installed on a vehicle equipped with a puncture repair kit including a puncture sealant, and the puncture can be repaired by injecting the puncture sealant into the tire. The pneumatic tire includes a pneumatic tire body defining a tire inner cavity and a porous silencer disposed in the tire inner cavity. The silencer is not fixed to the pneumatic tire body in the tire inner cavity but can be removed from the pneumatic tire body. The air permeability of the silencer measured in accordance with JIS K6400-7 is 27 ml / cm 2 / s or less.

[0008] The pneumatic tire of the present invention can maintain the repairability of a puncture by adopting the above-mentioned structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a tire meridian cross-sectional view showing one embodiment of the pneumatic tire of the present invention.

[0010] Figure 2 yes Figure 1 An enlarged stereoscopic view of the pneumatic tire body and the silencer body.

[0011] Figure 3 yes Figure 1An enlarged cross-sectional view of the silencer body.

[0012] Figure 4 Yes means Figure 1 Conceptual image of the side view of a tire.

[0013] Figure 5 This is a conceptual diagram showing a side view of a tire according to another embodiment.

[0014] Figure 6 This is an enlarged cross-sectional view of a silencer according to another embodiment.

[0015] Figure 7 is a conceptual diagram of a puncture repair kit used in the present invention.

[0016] Figure 8 It is a flow chart of the puncture repair method of the pneumatic tire of the present invention.

[0017] Fig. 9 This is a conceptual diagram showing a vehicle equipped with the pneumatic tire of the present invention.

[0018] Description of Reference Numerals

[0019] 1A... pneumatic tire body; 1B... tire inner cavity; 10... muffler. DETAILED DESCRIPTION

[0020] Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. Although the accompanying drawings include the features of the present invention, in order to help understand the present invention, sometimes they include exaggerated expressions and expressions with different dimensional ratios from the actual structure. In addition, in each embodiment, the same or common elements are marked with the same reference numerals, and repeated descriptions are omitted.

[0021] Figure 1 1 is a tire meridian cross-sectional view showing a pneumatic tire (hereinafter, sometimes simply referred to as a "tire") 1 in a normal state according to an embodiment of the present invention. Figure 1 1 is a diagram showing a cross section of a tire 1 extending in a circular shape when the tire 1 is cut along an imaginary plane passing through the tire rotation axis and perpendicular to the tire circumferential direction. Figure 1 As shown, in this embodiment, the pneumatic tire 1 for a passenger car is shown. However, the present invention can also be applied to a pneumatic tire 1 for a heavy load, for example.

[0022] The above-mentioned "normal state" means a state where the tire is assembled on a normal rim and filled with normal internal pressure and without load, when various specifications of pneumatic tires are specified. When various specifications of tires are not specified, the above-mentioned normal state means a standard usage state corresponding to the purpose of use of the tire and means a state where the tire is not installed on a vehicle and without load. In this specification, unless otherwise specified, the dimensions of various parts of the tire are values ​​measured in the above-mentioned normal state.

[0023] A "regular rim" is a rim whose specifications are specified for each tire in a specification system that includes the specifications that the tire complies with, for example, a "standard rim" in JATMA, a "design rim" in TRA, and a "measuring rim" in ETRTO.

[0024] "Normal internal pressure" is the air pressure specified for each tire in the specification system that includes the specifications that the tire is based on. If it is JATMA, it is the "maximum air pressure". If it is TRA, it is the maximum value recorded in the table "TIRE LOAD LIMITS ATVARIOUS COLD INFLATION PRESSURES". If it is ETRTO, it is "INFLATION PRESSURE".

[0025] The tire 1 of the present invention is installed on a vehicle equipped with a puncture repair kit including a puncture sealant. The puncture repair kit injects the puncture sealant from the air valve of the punctured tire to perform puncture repair. The puncture sealant injected into the tire can solidify when passing through the puncture to seal it. In addition, the tire 1 of the present invention performs puncture repair by injecting the puncture sealant into the tire from the air valve as described above. Therefore, the tire 1 of the present invention has a tread portion 2 with a degree of rigidity that the sealed puncture will not open again even if the vehicle is driven after the puncture repair, and specifically has at least a carcass 6 and a belt layer 7 described below.

[0026] The carcass 6 extends from the bead portion 4 on one side through the sidewall portion 3 on one side, the tread portion 2 and the sidewall portion 3 on the other side to the bead portion 4 on the other side. In addition, the carcass 6 has at least one carcass ply 6A, and in the present embodiment, has two carcass ply 6A. The carcass ply 6A is formed, for example, by coating an array of carcass cords with rubber. The carcass cords are arranged, for example, at an angle of 75 to 90 degrees relative to the tire circumferential direction. Organic fibers such as polyester fibers, nylon fibers, rayon fibers, polyethylene naphthalate fibers, and aramid fibers are applied to the carcass cords.

[0027] The carcass ply 6A includes, for example, a main body portion 6a and a folded portion 6b. The main body portion extends from the tread portion 2 through the sidewall portion 3 to the bead core 5. The folded portion 6b is connected to the main body portion 6a and folded around the bead core 5 from the axial inner side to the outer side of the tire and extends to the radial outer side of the tire.

[0028] The belt layer 7 is arranged in the tread portion 2 on the tire radially outer side of the carcass 6. The belt layer 7 includes at least one belt cord, and the belt layer 7 of the present embodiment is composed of two belt cords 7A and 7B. The belt cords 7A and 7B are formed by, for example, coating an array of belt cords with rubber.

[0029] The tire 1 of the present invention includes a pneumatic tire body 1A defining a tire inner cavity 1B and a porous muffler 10 disposed in the tire inner cavity 1B. The muffler 10 can absorb air vibrations inside the running tire 1 and contribute to reducing tire noise.

[0030] On the other hand, in the past, when a pneumatic tire having a porous silencer was repaired using the puncture repair kit, the silencer sometimes blocked the puncture sealant from flowing into the puncture, thereby impairing the puncture repairability. Specifically, the porous silencer sometimes absorbed part of the puncture sealant, making it difficult for the puncture sealant to reach the puncture.

[0031] In contrast, the silencer 10 of the present invention is not fixed to the pneumatic tire body 1A in the tire inner cavity 1B, but can be removed from the pneumatic tire body 1A. The air permeability of the silencer 10 of the present invention measured in accordance with JIS K6400-7 is 27 ml / cm 2 / s or less.

[0032] As described above, in the present invention, since the silencer 10 is detachable from the pneumatic tire body 1A, the puncture sealant easily reaches the puncture. In addition, in the present invention, since the air permeability of the silencer 10 is specified as described above, the puncture sealant is difficult to be absorbed by the silencer 10, and the repairability of the puncture can be reliably maintained.

[0033] Furthermore, in the past, when the pneumatic tire having a porous silencer was repaired using the puncture repair kit, part of the puncture sealant was also absorbed by the silencer, causing the weight of the silencer to increase locally. Such weight imbalance of the silencer increases the vibration of the tire during driving, so the tire has to be replaced after the puncture repair. In contrast, in the present invention, after the puncture repair, the silencer 10 that has absorbed part of the puncture sealant can be easily removed from the pneumatic tire body 1A, and the vibration during driving can be suppressed and the tire can continue to be used.

[0034] The following describes a more detailed structure of the present embodiment. In addition, each structure described below represents a specific form of the present embodiment. Therefore, it is obvious that the present invention can exert the above-mentioned effects even without the structure described below. In addition, even if any one of the structures described below is applied alone to the tire of the present invention having the above-mentioned characteristics, it is expected that the performance corresponding to each structure will be improved. Moreover, in the case of applying several of the structures described below in combination, it is possible to achieve the improvement of the composite performance corresponding to each structure.

[0035] Unless otherwise specified, the dimensions of the silencer 10 described below are measured when the tire 1 is not mounted on the rim, the distance between the pair of bead cores 5 is consistent with the above-mentioned normal state, and the silencer 10 is arranged in the tire inner cavity 1B.

[0036] The muffler 10 is made of, for example, a porous sponge material. The sponge material is made of, for example, a material having continuous cells formed by foaming rubber or synthetic resin. In a preferred embodiment, the muffler 10 is made of a polyurethane sponge having both ether bonds and ester bonds. However, the present invention is not limited to such an embodiment.

[0037] exist Figure 2 Shows Figure 1 An enlarged perspective view of the pneumatic tire body 1A and the muffler 10. Figure 2 As shown, the silencer 10 is in contact with the surface of the tread portion 2 on the side of the tire inner cavity 1B (but not fixed). The outer side surface of the silencer 10 in the tire radial direction is flat. In addition, the cross section of the silencer 10 orthogonal to the tire circumferential direction is rectangular. In a preferred form, the above-mentioned cross section of the silencer 10 is a rectangular shape that is long in the axial direction of the tire. In addition, the silencer 10 is in contact with substantially the entirety (more than 80%) of the tire inner cavity 1B in the tire circumferential direction. Such a silencer 10 can exert excellent noise reduction effect and durability.

[0038] exist Figure 3 FIG. 2 shows an enlarged cross-sectional view of the muffler body 10. Figure 3 As shown, the maximum thickness t1 of the silencer 10 in the tire radial direction is 10 to 40 mm. In addition, the maximum width W1 of the silencer 10 in the tire axial direction is equal to the cross-sectional width Wt ( Figure 1 The muffler 10 is preferably 20% to 80% of the pneumatic tire body 1A, preferably 20% to 40%. Such a muffler 10 is difficult to separate from the pneumatic tire body 1A during tire travel. Therefore, the wear of the muffler 10 is suppressed.

[0039] exist Figure 4 A diagram conceptually showing the side surface of the tire 1 is shown. Figure 4 In FIG. 1 , the muffler 10 is indicated by a dotted line. Figure 4As shown in FIG. 1 , the silencer 10 of the present embodiment is an annular structure including a first end 10a in the tire circumferential direction, a second end 10b in the tire circumferential direction, and a fixing portion 13 for fixing the first end 10a and the second end 10b. Figure 4 In the embodiment, dots are provided on the fixing portion 13. Such a silencer 10 can suppress the end of the silencer 10 from coming into contact with the rim or the like and being worn, thereby achieving excellent durability.

[0040] The first end 10a and the second end 10b are fixed by, for example, an adhesive. In another embodiment, the first end 10a and the second end 10b may be welded (bonded after melting the sponge material with heat).

[0041] In this embodiment, the annular silencer 10 is slightly compressed and arranged in the tire inner cavity 1B, so that the silencer 10 does not float locally from the pneumatic tire body 1A, and more than 90% of the outer side surface 10s in the tire radial direction of the silencer 10, preferably the entirety thereof, is in contact with the pneumatic tire body 1A. Such a silencer 10 can rotate with the tire 1 even if it is not fixed to the pneumatic tire body 1A, so it is difficult to wear and the durability is improved.

[0042] From the viewpoint of realizing the above-mentioned form, in the natural state where the first end 10a and the second end 10b of the silencer 10 are released and the silencer 10 extends linearly on a plane, the maximum length from the first end 10a to the second end 10b of the silencer 10 is preferably 100 mm / s. Figure 1 The maximum circumference of the tire cavity 1B is 94% to 107% of the maximum circumference of the tire cavity 1B. The maximum circumference of the tire cavity 1B refers to the maximum length in the tire circumferential direction at the inner surface of the pneumatic tire body 1A. In the present embodiment in which the tread portion 2 is convexly curved toward the outer side in the tire radial direction, the length of the circumference of the circle formed by the inner surface of the pneumatic tire body 1A and the tire equatorial plane intersecting each other is equivalent to the above-mentioned maximum circumference.

[0043] exist Figure 5 FIG. 2 shows a side view of a tire 1 in another embodiment. Figure 5 As shown, the silencer 10 of this embodiment has a non-annular structure having a first end 10a in the tire circumferential direction and a second end 10b in the tire circumferential direction that is not fixed to the first end 10a. Such a silencer 10 facilitates replacement work after using the puncture sealant.

[0044] The maximum length from the first end 10a to the second end 10b of the silencer 10 is preferably 85% to 99% of the maximum circumference of the tire inner cavity 1B. This makes it possible to easily replace the silencer 10 while achieving a sufficient silencing effect.

[0045] exist Figure 6FIG. 2 shows an enlarged cross-sectional view of a muffler 10 according to another embodiment. Figure 6 As shown, the silencer 10 of this embodiment has at least one groove 15 formed on the outer side surface 10s (the surface on the tire inner cavity 1B side) in the tire radial direction. In a preferred embodiment, a plurality of the above-mentioned grooves 15 extending continuously in the tire circumferential direction are provided in the tire axial direction. The opening width W2 of the groove 15 is 3% to 10% of the maximum width W1 of the silencer 10 in the tire axial direction. The depth d1 of the groove 15 is, for example, 15% to 20% of the maximum thickness t1 of the silencer 10. Such a groove 15 makes it easier for the puncture sealant to reach the puncture when repairing the puncture.

[0046] The groove 15 is not limited to the above-mentioned form, and may extend in the tire axial direction, for example (not shown). Such a groove 15 can facilitate the movement of the puncture sealant in the tire axial direction, for example, and can further enhance the above-mentioned effect.

[0047] A second aspect of the present invention is a method for repairing a puncture in the pneumatic tire 1 described above. Figure 7 2 shows a conceptual diagram of a puncture repair kit 20 used in the present invention. Figure 7 In the figure, the puncture repair kit 20 is drawn larger than the actual tire 1. The puncture repair kit 20 includes a bottle unit 21 in which a puncture sealant is placed and a compressor 22 capable of supplying high-pressure air. The bottle unit 21 is preferably mounted on the compressor 22 for use.

[0048] exist Figure 8 FIG. 2 is a flow chart showing a method for repairing a puncture of a pneumatic tire according to the present invention. Figure 8 As shown, the above-mentioned perforation repairing method includes at least a first step S1 and a second step S2 described below.

[0049] In the first step S1, as in the conventional method, for example, Figure 7 The puncture repair kit 20 shown injects a puncture sealant into the inner cavity of the tire to fill the puncture with the puncture sealant. Thereafter, the tire air pressure can be appropriately adjusted for normal driving.

[0050] Conventionally, since part of the puncture sealing agent is also absorbed by the muffler, the vibration of the tire increases during the running after the first step S1, and the tire has to be replaced even if there is no problem with other parts of the tire.

[0051] In contrast, in the second step S2 of the puncture repair method of the present invention, the silencer 10 that has absorbed a portion of the puncture sealant filled in the tire inner cavity 1B is removed from the pneumatic tire body 1A. In the present invention, since the silencer 10 is not fixed to the tire inner cavity 1B, this operation can be easily performed. Therefore, the tire can continue to be used after the puncture repair.

[0052] The puncture repairing method of the present invention preferably further includes, after the second step S2, a third step S3 of placing a new silencer that has not absorbed the puncture sealant in the inner cavity of the tire. This allows the tire to continue to be used after the noise reduction effect is restored.

[0053] However, the present invention is not limited to the above-mentioned embodiment. In another embodiment, the pneumatic tire body 1A may be used without arranging a new silencer 10 in the second step S2. In addition, the puncture repairing method of the present invention may include a step of removing the puncture sealant remaining in the tire inner cavity 1B.

[0054] exist Fig. 9 A conceptual diagram of a vehicle 25 equipped with the pneumatic tire 1 of the present invention is shown. The vehicle is equipped with the above-mentioned tire 1 ( Figure 1 As shown) and having the above-mentioned puncture repair kit 20 ( Figure 7 As shown in FIG. 1 , the vehicle 25 can therefore maintain the repairability of the puncture and can continue to use the tire even after the puncture is repaired.

[0055] The vehicle 25 does not have a spare tire, but is equipped with the above-mentioned tire 1 instead of the spare tire and is equipped with the above-mentioned puncture repair kit 20. A vehicle without a spare tire is expected to improve fuel efficiency and can ensure a wide interior space.

[0056] As mentioned above, the pneumatic tire etc. which concerns on one embodiment of this invention were demonstrated in detail, but this invention is not limited to the said specific embodiment, and can be implemented by changing into various forms.

[0057] [Example]

[0058] Made with Figure 1 A pneumatic tire with a size of 215 / 55R17 and a basic structure of and based on the specifications of Table 1. In addition, as a comparative example, a muffler having an air permeability of 42 ml / cm 2 / s pneumatic tire. The tire of the comparative example is substantially the same as the tire of the embodiment except for the above-mentioned matters. The air seal test was implemented for these test tires. The common specifications and test methods of each test tire are as follows.

[0059] Installed rim: 17×7.5J

[0060] Tire internal pressure: 250kPa

[0061] <Air seal test>

[0062] After a 5mm diameter nail is driven through the center of the tread of the test tire to form a puncture, the nail is pulled out and 400ml of puncture sealant is injected into the inner cavity of the tire. Next, the tire internal pressure is adjusted to 250kPa and the tire is driven on a roller tester at a speed of 30-60km / h for 15 minutes. After that, check whether there is air leakage from the puncture. If there is no air leakage, it is qualified.

[0063] The test results are shown in Table 1.

[0064] [Table 1]

[0065] Comparative Example Example 1 Example 2 <![CDATA[Ventilation of the sound deadening body (ml / cm 2 / s)]]> 42 27 2 Air seal test Failure qualified qualified

[0066] As shown in Table 1, in the comparative example, the air sealing test failed because the air permeability of the silencer was large, but the tire of the example passed, and it was confirmed that the repairability of the puncture was maintained.

[0067] [Note]

[0068] The present invention includes the following aspects.

[0069] [Present invention 1]

[0070] A pneumatic tire is mounted on a vehicle equipped with a puncture repair kit containing a puncture sealant, and can be used to repair a puncture by injecting the puncture sealant into the tire, wherein:

[0071] The pneumatic tire includes a pneumatic tire body defining an inner cavity of the tire and a porous sound-absorbing body arranged in the inner cavity of the tire.

[0072] The silencer is not fixed to the pneumatic tire body in the tire cavity but can be removed from the pneumatic tire body.

[0073] The air permeability of the above-mentioned silencer measured in accordance with JIS K6400-7 is 27 ml / cm 2 / s or less.

[0074] [Present invention 2]

[0075] According to the pneumatic tire of the first aspect of the present invention,

[0076] The silencer has an annular structure including a first end in the tire circumferential direction, a second end in the tire circumferential direction, and a fixing portion that fixes the first end and the second end.

[0077] [Present invention 3]

[0078] According to the pneumatic tire of the second invention,

[0079] In a natural state after the first end and the second end of the silencer are released from fixation, a maximum length of the silencer from the first end to the second end is 94% to 107% of a maximum circumference of an inner cavity of the tire.

[0080] [Present invention 4]

[0081] According to the pneumatic tire of the first aspect of the present invention,

[0082] The silencer has a non-annular structure having a first end in the tire circumferential direction and a second end in the tire circumferential direction that is not fixed to the first end.

[0083] [Present invention 5]

[0084] According to the pneumatic tire of the fourth invention,

[0085] The maximum length of the silencer from the first end to the second end is 85% to 99% of the maximum circumference of the inner cavity of the tire.

[0086] [Present invention 6]

[0087] The pneumatic tire according to any one of Inventions 1 to 5, wherein:

[0088] The outer side surface of the silencer in the tire radial direction is flat.

[0089] [Present invention 7]

[0090] The pneumatic tire according to any one of Inventions 1 to 6, wherein:

[0091] The noise absorbing body is composed of a polyurethane sponge having both ether bonds and ester bonds.

[0092] [Present invention 8]

[0093] The pneumatic tire according to any one of Inventions 1 to 7, wherein:

[0094] The maximum thickness of the silencer in the tire radial direction is 10 to 40 mm.

[0095] [Present invention 9]

[0096] The pneumatic tire according to any one of Inventions 1 to 8, wherein:

[0097] The maximum width of the silencer in the tire axial direction is 20% to 80% of the cross-sectional width of the pneumatic tire body.

[0098] [Present invention 10]

[0099] The pneumatic tire according to any one of Inventions 1 to 9, wherein:

[0100] The silencer has a rectangular cross section perpendicular to the tire circumferential direction.

[0101] [Present invention 11]

[0102] A method for repairing a puncture of a pneumatic tire, wherein:

[0103] The pneumatic tire includes a pneumatic tire body defining an inner cavity of the tire and a porous sound-absorbing body arranged in the inner cavity of the tire.

[0104] The silencer is not fixed to the pneumatic tire body in the tire cavity but can be removed from the pneumatic tire body.

[0105] The above-mentioned perforation repair method comprises:

[0106] The first step is to inject a puncture sealant into the inner cavity of the tire to fill the puncture with the puncture sealant; and

[0107] In the second step, the silencer that has absorbed a portion of the puncture sealing agent filled in the inner cavity of the tire is removed from the pneumatic tire body.

[0108] [Present invention 12]

[0109] According to the pneumatic tire puncture repair method of the present invention 11, wherein:

[0110] The method further includes a third step of disposing a new silencer that has not absorbed the puncture sealing agent in the inner cavity of the tire after the second step.

[0111] [Present invention 13]

[0112] According to the pneumatic tire puncture repair method of the present invention 11, wherein:

[0113] After the second step, no new silencer is disposed on the pneumatic tire body.

[0114] [Present invention 14]

[0115] A vehicle is provided with a pneumatic tire, wherein:

[0116] The vehicle is provided with a puncture repair kit for repairing a puncture of the pneumatic tire, wherein the puncture repair kit is used to inject a puncture sealant into the inner cavity of the tire when a puncture occurs in the pneumatic tire.

[0117] The pneumatic tire includes a pneumatic tire body defining an inner cavity of the tire and a porous sound-absorbing body arranged in the inner cavity of the tire.

[0118] The silencer is not fixed to the pneumatic tire body in the tire inner cavity but is detachable from the pneumatic tire body.

[0119] [Present invention 15]

[0120] The vehicle according to claim 14, wherein:

[0121] No spare tire.

Claims

1. A pneumatic tire mounted on a vehicle equipped with a puncture repair kit containing a puncture sealant, and capable of repairing a puncture by injecting the puncture sealant into the tire, in, The pneumatic tire includes a pneumatic tire body defining an inner cavity of the tire and a porous sound absorbing body arranged in the inner cavity of the tire. The silencer is not fixed to the pneumatic tire body in the tire inner cavity but can be removed from the pneumatic tire body. The air permeability of the silencer measured in accordance with JIS K6400-7 is 27 ml / cm 2 / s or less.

2. The pneumatic tire according to claim 1, wherein: The silencer has an annular structure including a first end in the tire circumferential direction, a second end in the tire circumferential direction, and a fixing portion fixing the first end and the second end.

3. The pneumatic tire according to claim 2, wherein: In a natural state after the first end and the second end of the silencer are released from fixation, a maximum length of the silencer from the first end to the second end is 94% to 107% of a maximum circumference of the tire inner cavity.

4. The pneumatic tire according to claim 1, wherein: The silencer has a non-annular structure having a first end in the tire circumferential direction and a second end in the tire circumferential direction that is not fixed to the first end.

5. The pneumatic tire according to claim 4, wherein: The maximum length of the silencer from the first end to the second end is 85% to 99% of the maximum circumference of the inner cavity of the tire.

6. The pneumatic tire according to any one of claims 1 to 5, wherein: The outer side surface of the silencer in the tire radial direction is flat.

7. The pneumatic tire according to any one of claims 1 to 5, wherein The noise absorbing body is composed of a polyurethane sponge having both ether bonds and ester bonds.

8. The pneumatic tire according to any one of claims 1 to 5, wherein The maximum thickness of the silencer in the tire radial direction is 10 to 40 mm.

9. The pneumatic tire according to any one of claims 1 to 5, wherein The maximum width of the silencer in the tire axial direction is 20% to 80% of the cross-sectional width of the pneumatic tire body.

10. The pneumatic tire according to any one of claims 1 to 5, wherein The silencer has a rectangular cross section perpendicular to the tire circumferential direction.

11. A method for repairing a puncture of a pneumatic tire, wherein: The pneumatic tire includes a pneumatic tire body defining an inner cavity of the tire and a porous sound absorbing body arranged in the inner cavity of the tire. The silencer is not fixed to the pneumatic tire body in the tire inner cavity but can be removed from the pneumatic tire body. The perforation repair method comprises: The first step is to inject a puncture sealant into the inner cavity of the tire to fill the puncture with the puncture sealant; and In the second step, the silencer that has absorbed a portion of the puncture sealing agent filled in the tire inner cavity is removed from the pneumatic tire body.

12. The method for repairing a puncture of a pneumatic tire according to claim 11, wherein: The method further includes, after the second step, disposing a new silencer that has not absorbed the puncture sealing agent in the inner cavity of the tire.

13. The method for repairing a puncture of a pneumatic tire according to claim 11, wherein: After the second step, no new silencer is arranged on the pneumatic tire body.

14. A vehicle equipped with a pneumatic tire, wherein: The vehicle is provided with a puncture repair kit for repairing a puncture of the pneumatic tire, wherein the puncture repair kit is used to inject a puncture sealant into the inner cavity of the tire when a puncture occurs in the pneumatic tire. The pneumatic tire includes a pneumatic tire body defining an inner cavity of the tire and a porous sound absorbing body arranged in the inner cavity of the tire. The silencer is not fixed to the pneumatic tire body in the tire inner cavity but is detachable from the pneumatic tire body.

15. The vehicle of claim 14, wherein: No spare tire.

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