Asymmetric low noise tire

Abstract

The present invention relates to an asymmetric low-noise tire, comprising a tire body, a main body silent cotton and an auxiliary silent cotton, and the main body silent cotton and the auxiliary silent cotton are both bonded to the inner lining layer of the tire body, wherein the mass of the outer side of the tire tread is greater than the mass of the inner side of the tread; the mass of the outer side of the main body silent cotton is less than the mass of the inner side of the main body silent cotton; the mass of the outer side of the auxiliary silent cotton is less than the mass of the inner side of the auxiliary silent cotton; the mass difference m1 of the outer side of the tire tread, the mass difference m2 of the inner side of the main body silent cotton, and the mass difference m3 of the inner side of the auxiliary silent cotton satisfy m2+m3=m1, and the unit is g. The asymmetric low-noise tire of the present invention can be applied to tires with asymmetric pattern design, which can not only reduce the cavity noise and vibration noise of the tread part of the tire, but also improve the uniformity and dynamic balance performance of the tire, improve the handling stability and driving safety of the tire, and provide a comfortable driving experience.

Description

Technical Field

[0001] The invention belongs to the technical field of tires, and in particular relates to an asymmetric low-noise tire. Background Art

[0002] In recent years, with the steady increase in the production, sales and market share of electric vehicles, consumers have a higher pursuit of driving environment, among which low noise and handling stability have become one of the concerns of consumers. The emergence of silent tires is of great significance to reducing noise by applying silent sponge to the middle of the tread with double-sided tape or glue, and the shape, material and weight of silent sponge and double-sided tape or glue are symmetrically distributed on the center line of the tread.

[0003] However, for tires with asymmetric pattern designs, the weight of the tread area increases after the attachment of the silent cotton, the uniformity and dynamic balance performance of the tire will decrease, and the tire noise will also become louder, affecting the driving experience as well as the handling stability and driving safety of the tire. Summary of the invention

[0004] In view of the shortcomings existing in the related art, the present invention provides an asymmetric low-noise tire that can be applied to tires with asymmetric pattern designs. It can not only reduce the cavity noise and tread vibration noise of the tire, but also improve the uniformity and dynamic balance performance of the tire, improve the handling stability and driving safety of the tire, and provide a comfortable driving experience.

[0005] The present invention provides an asymmetric low-noise tire, comprising: a tire body, a main sound-proof cotton and an auxiliary sound-proof cotton, and the main sound-proof cotton and the auxiliary sound-proof cotton are both bonded to the inner lining layer of the tire body, wherein the mass of the outer side of the tire tread is greater than the mass of the inner side of the tread; the mass of the outer side of the main sound-proof cotton is less than the mass of the inner side of the main sound-proof cotton; the mass of the outer side of the auxiliary sound-proof cotton is less than the mass of the inner side of the auxiliary sound-proof cotton; the mass difference m1 between the outer and inner sides of the tire tread, the mass difference m2 between the inner and outer sides of the main sound-proof cotton, and the mass difference m3 between the inner and outer sides of the auxiliary sound-proof cotton satisfy m2+m3=m1, and the unit is g.

[0006] In some embodiments, the mass difference between the inner and outer sides of the tire tread is m1=M1×a, with the unit of g, where M1 is the tread weight and a is the sea-to-land ratio difference between the inner and outer sides of the tire tread pattern; the mass difference between the inner and outer sides of the main sound-absorbing cotton is m2=M2×a, with the unit of g, where M2 is the overall weight of the main sound-absorbing cotton; the mass difference between the inner and outer sides of the auxiliary sound-absorbing cotton is m3=M3×a, with the unit of g, where M3 is the overall weight of the auxiliary sound-absorbing cotton.

[0007] In some of the embodiments, the width and depth of the outer main body sound-proof cotton and the inner main body sound-proof cotton are the same, and both the outer main body sound-proof cotton and the inner main body sound-proof cotton are in an "n"-shaped structure, and the two constitute an "m"-shaped main body sound-proof cotton; the outer auxiliary sound-proof cotton and the inner auxiliary sound-proof cotton are in a semicircular structure, and the center of the semicircle is located at the bottom of the auxiliary sound-proof cotton and coincides with the center line of the longitudinal groove of the pattern at the bonding position of the auxiliary sound-proof cotton and the inner lining layer.

[0008] In some of the embodiments, the asymmetric low noise tire further includes a non-air-permeable film, which is located on a side of the main silent foam close to the tread.

[0009] In some of the embodiments, the main body sound-proofing cotton and the auxiliary sound-proofing cotton are bonded together, wherein the outer main body sound-proofing cotton and the outer auxiliary sound-proofing cotton are bonded together to form the outer sound-proofing cotton, and the inner main body sound-proofing cotton and the inner auxiliary sound-proofing cotton are bonded together to form the inner sound-proofing cotton.

[0010] In some of the embodiments, the outer noise-reducing sponge and the inner noise-reducing sponge are symmetrically distributed on the radial center line of the tread.

[0011] In some of the embodiments, in the circumferential direction of the tire, both the outer side noise-reducing sponge and the inner side noise-reducing sponge are multi-segment structures.

[0012] In some of the embodiments, in the axial direction of the tire, both the outer side noise-reducing sponge and the inner side noise-reducing sponge are multi-segment structures.

[0013] In some of the embodiments, in the circumferential direction of the tire, both ends of the outer sound-proofing cotton and the inner sound-proofing cotton are staggered.

[0014] In some of the embodiments, in the radial direction of the tire, both the outer side noise-reducing sponge and the inner side noise-reducing sponge are layered structures.

[0015] Based on the above technical solution, compared with the prior art, the asymmetric low-noise tire in the embodiment of the present invention has the following advantages:

[0016] (1) The asymmetric low-noise tire of the present invention can reduce the tire cavity noise and the noise in the longitudinal groove of the tread, and improve the uniformity and dynamic balance performance of the tire; the mass difference between the inner and outer sides of the tire tread m1, the mass difference between the inner and outer sides of the main silent cotton m2, and the mass difference between the inner and outer sides of the auxiliary silent cotton m3 satisfy m2+m3=m1. The difference in mass between the inner and outer sides of the asymmetric silent cotton is utilized to make up for the difference in mass between the inner and outer sides of the tread of the asymmetric pattern design. After the cotton is attached, the uniformity and dynamic balance value of the tire are improved.

[0017] (2) The main body sound-proofing sponge of the asymmetric low-noise tire of the present invention includes an outer main body sound-proofing sponge and an inner main body sound-proofing sponge of the same width and thickness. The outer main body sound-proofing sponge and the inner main body sound-proofing sponge are both in an "n"-shaped design. The two together form an "m"-shaped main body sound-proofing sponge, which can reduce the weight of the sound-proofing sponge and reduce the impact on the uniformity and dynamic balance performance of the tire.

[0018] (3) The outer side and inner side of the auxiliary sound-proofing sponge of the asymmetric low-noise tire of the present invention are both semicircular in design, and the center of the semicircle is located at the bottom of the auxiliary sound-proofing sponge and coincides with the center line of the longitudinal groove at the bonding position, so that the auxiliary sound-proofing sponge can be in direct contact with the longitudinal groove position and completely cover the longitudinal groove position, thereby reducing the noise at the longitudinal groove position.

[0019] (4) The asymmetric low-noise tire of the present invention divides the sound-absorbing sponge into two sound-absorbing functional areas by setting a non-air-permeable film on the side of the main sound-absorbing sponge close to the tread. The main sound-absorbing sponge mainly reduces the cavity noise of the tire, and the auxiliary sound-absorbing sponge mainly reduces the vibration noise of the longitudinal groove of the tread. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of the structure of an asymmetric low-noise tire according to an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the comparison test results of the front and rear dynamic balance of the asymmetric low-noise tire with sponge in the embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the RFV comparison test results of the asymmetric low-noise tire before and after the tire is taped according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the LFV comparison test results of the asymmetric low-noise tire before and after the tire is attached with cotton according to an embodiment of the present invention;

[0025] Figure 5 It is a schematic diagram of the comparative test results of |CON| before and after the asymmetric low-noise tire is taped according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the spectrum results of the front cavity noise test of the asymmetric low-noise tire with sponge in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the frequency spectrum results of the cavity noise test of the asymmetric low-noise tire after being taped with cotton according to an embodiment of the present invention;

[0028] Figure 8 It is a schematic diagram of the noise comparison test results of the tread area of ​​the asymmetric low-noise tire before and after the sponge is applied in an embodiment of the present invention;

[0029] Fig. 9 It is a structural schematic diagram of a second embodiment of an asymmetric low-noise tire of the present invention;

[0030] Fig.10 It is a schematic structural diagram of a third embodiment of an asymmetric low-noise tire of the present invention;

[0031] Fig.11 It is a structural schematic diagram of a fourth embodiment of an asymmetric low-noise tire of the present invention;

[0032] Fig.12 It is a schematic diagram of an asymmetric low-noise tire of the present invention, in which both the outer and inner silent sponges in the tire circumferential direction are of a common one-stage structure;

[0033] Fig.13 It is a structural schematic diagram of a fifth embodiment of an asymmetric low-noise tire of the present invention;

[0034] Fig.14 It is a schematic diagram of an asymmetric low-noise tire of the present invention, in which both the outer and inner silent sponges of the tire axial direction are of a common one-stage structure;

[0035] Fig.15 It is a structural schematic diagram of a sixth embodiment of an asymmetric low-noise tire of the present invention;

[0036] Fig.16 It is a structural schematic diagram of a seventh embodiment of an asymmetric low-noise tire of the present invention;

[0037] Fig.17 It is a structural schematic diagram of an eighth embodiment of an asymmetric low-noise tire of the present invention;

[0038] Fig.18 It is a structural schematic diagram of a ninth embodiment of an asymmetric low-noise tire of the present invention;

[0039] Fig.19 It is a schematic structural diagram of the tenth embodiment of the asymmetric low-noise tire of the present invention.

[0040] In the figure: 100, tire body, 110, longitudinal groove of pattern; 210, outer main body sound-proofing cotton, 220, inner main body sound-proofing cotton; 310, outer auxiliary sound-proofing cotton, 320, inner auxiliary sound-proofing cotton; 400, non-air-permeable film; 500, semicircular ring cavity structure. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] As attached Figure 1 As shown, in an illustrative embodiment of the asymmetric low-noise tire of the present invention, the asymmetric low-noise tire includes a tire body 100, a main silent cotton and an auxiliary silent cotton, and the main silent cotton and the auxiliary silent cotton are both bonded to the inner liner of the tire body 100, and the bonding method adopts glue or double-sided tape. Among them, the mass of the outer side of the tire tread is greater than the mass of the inner side of the tread; the mass of the outer side of the main silent cotton 210 is less than the mass of the inner side of the main silent cotton 220; the mass of the outer side of the auxiliary silent cotton 310 is less than the mass of the inner side of the auxiliary silent cotton 320; the mass difference m1 of the inner side of the tire tread, the mass difference m2 of the inner side of the main silent cotton, and the mass difference m3 of the inner side of the auxiliary silent cotton satisfy m2+m3=m1, and the unit is g. The above-mentioned structural setting utilizes the difference in the mass of the inner and outer sides of the asymmetric silent cotton to make up for the difference in the mass of the inner and outer sides of the tread of the asymmetric pattern design. After the cotton is attached, the uniformity and dynamic balance value of the tire are improved.

[0044] The asymmetric low-noise tire of the present invention has an asymmetric tread pattern, and the sea-to-land ratio of the outer side of the tire tread pattern is greater than the sea-to-land ratio of the inner side of the tire tread pattern, and the difference a between the outer and inner sides of the tire tread pattern is 2.5%-4.5%; the mass of the outer side of the tire tread is greater than the mass of the inner side of the tread, and the mass difference m1 of the outer and inner sides of the tire tread is m1=M1×a, in units of g, wherein M1 is the tread weight, and a is the difference between the outer and inner sides of the tire tread pattern. Preferably, the number of longitudinal grooves 110 in the middle of the tire tread is 2, the depth of the longitudinal grooves 110 is 5mm-10mm, and the width of the longitudinal grooves 110 is 10mm-15mm.

[0045] The main body silent sponge of the asymmetric low-noise tire of the present invention is located in the middle of the tread, and the radial center line of the main body silent sponge coincides with the radial center line CL of the tread. The width and thickness of the outer main body silent sponge 210 and the inner main body silent sponge 220 are the same, and the outer main body silent sponge 210 and the inner main body silent sponge 220 are both "n"-shaped designs, and the two form an "m"-shaped main body silent sponge. Compared with the closed design, this "n"-shaped structure can reduce the weight of the main body silent sponge, thereby reducing the impact on the uniformity and dynamic balance performance of the tire. The mass of the outer main body silent sponge 210 is less than the mass of the inner main body silent sponge 220, and the mass difference between the inner and outer sides of the main body silent sponge is m2=M2×a, in g, where M2 is the overall weight of the main body silent sponge, and a is the difference in sea-land ratio between the outer and inner sides of the tire tread pattern. In the middle of the tread, when the tread contacts the road surface, the material thickness of the longitudinal groove position is the thinnest, and this area produces the greatest vibration and noise. Therefore, the main body silent sponge needs to completely cover this area, which can improve the noise reduction effect of the area around the longitudinal groove position in the tire. For this reason, the thickness of the outer main body silent sponge 210 and the inner main body silent sponge 220 are both 200%-300% of the longitudinal groove depth, and the width is 500%-700% of the longitudinal groove width. The lower part of the outer main body silent sponge 210 and the inner main body silent sponge 220 are both designed with cavities, and the cavity height is 120%-130% of the depth of the pattern longitudinal groove 110, and is not greater than 70% of the thickness of the main body silent sponge, and the cavity width is 80%-90% of the width of the pattern longitudinal groove 110. The first corner of the outer main body silent sponge 210 close to the outer side of the tire and the second corner of the inner main body silent sponge 220 close to the inner side of the tire are both designed with a 90° right angle, an obtuse angle, an elliptical design or a smooth transition. Preferably, the first corner of the outer main body silent sponge 210 close to the outer side of the tire adopts a rounded transition design with a radius of 5mm-10mm; the second corner of the inner main body silent sponge 220 close to the inner side of the tire adopts a rounded transition design with a radius of 5mm-10mm, and the radius of the second corner is the same as the first corner. The use of a rounded transition design can not only reduce the weight of the main body silent sponge, thereby reducing the impact on the uniformity and dynamic balance performance of the tire; but also increase the area of ​​the corner position, reduce the force in this area, and improve the tear resistance of this part.

[0046] The auxiliary mute sponge of the asymmetric low-noise tire of the present invention is located at the longitudinal groove position in the middle of the tread, and is bonded to the inner liner. The auxiliary mute sponge includes an outer auxiliary mute sponge 310 and an inner auxiliary mute sponge 320. Among them, the outer auxiliary mute sponge 310 and the inner auxiliary mute sponge 320 are both semicircular in design, and the center of the semicircle is located at the bottom of the auxiliary mute sponge and coincides with the center line of the pattern longitudinal groove 110 at the bonding position, and the radius is 60%-70% of the longitudinal groove width. The above structure can make the auxiliary mute sponge directly contact with the pattern longitudinal groove 110 position and completely cover the pattern longitudinal groove 110 position, thereby reducing the noise at the pattern longitudinal groove 110 position. The mass of the outer auxiliary mute sponge 310 is less than that of the inner auxiliary mute sponge 320, and the mass difference between the inner and outer sides of the auxiliary mute sponge is m3=M3×a, in g, wherein M3 is the overall weight of the auxiliary mute sponge, and a is the difference in sea-land ratio between the outer and inner sides of the tire tread pattern.

[0047] The following is combined with Figure 1-18 The specific structures of multiple embodiments of the asymmetric low noise tire of the present invention are described.

[0048] refer to Figure 1 As shown, the first embodiment of the asymmetric low-noise tire of the present invention is shown. The asymmetric low-noise tire includes a tire body, a main silent cotton and an auxiliary silent cotton, and also includes a non-air-permeable film 400. The non-air-permeable film 400 is located on the side of the main silent cotton close to the tread. Therefore, the non-air-permeable film 400 divides the silent cotton into two silent functional areas. The main silent cotton mainly reduces the cavity noise of the tire, and the auxiliary silent cotton mainly reduces the vibration noise of the longitudinal groove of the tread. The non-air-permeable film 400 and the auxiliary silent cotton located below the main silent cotton form a semicircular ring cavity structure 500, which can effectively reduce the vibration noise of the tread. This is because the vibration noise at the longitudinal groove position of the tread is first reduced by the auxiliary silent cotton, and then transmitted to the non-air-permeable film position, and then reflected by the non-air-permeable film and transmitted to the auxiliary silent cotton position.

[0049] The asymmetric low-noise tire of Example 1 was tested for performance before and after being attached with silent foam, wherein: Figure 2 This is a schematic diagram of the dynamic balance comparison test results. Figure 3 This is a schematic diagram of RFV comparison test results. Figure 4 This is a schematic diagram of the LFV comparison test results. Figure 5 This is a schematic diagram of the |CON| comparison test results. Figure 2 The dynamic balance comparison test results show that the dynamic balance data of the tire is reduced after the silent foam is attached, indicating that the dynamic balance performance of the tire is improved; Figure 3 RFV comparison test results, Figure 4 LFV comparison test results and Figure 5The |CON| comparison test results show that the RFV, LFV and |CON| data of the tire after the silent sponge is attached are reduced, indicating that the uniformity performance of the tire is improved; Figure 6 and Figure 7 The results of the cavity noise comparison test spectrum show that after attaching the silent foam, the tire cavity noise is reduced in the range of 190HZ-250HZ; Figure 8 From the comparison test results of the noise in the tread area, it can be seen that after attaching the silent cotton, the noise in the longitudinal groove area of ​​the tread is reduced within the range of 900HZ-2000HZ.

[0050] refer to Fig. 9 The figure shows the second embodiment of the asymmetric low-noise tire of the present invention. This embodiment is a variation of the first embodiment. In this embodiment, the non-air-permeable film 400 and the auxiliary sound-proof sponge located below the main sound-proof sponge no longer form a semicircular ring-shaped cavity structure. One side of the non-air-permeable film 400 is bonded to the main sound-proof sponge, and the other side is bonded to the auxiliary sound-proof sponge. Specifically, the outer main sound-proof sponge 210 and the outer auxiliary sound-proof sponge 310 are bonded together, and the two are connected by the non-air-permeable film 400; the inner main sound-proof sponge 220 and the inner auxiliary sound-proof sponge 320 are bonded together, and the two are connected by the non-air-permeable film 400.

[0051] refer to Fig.10 As shown, the third embodiment of the asymmetric low-noise tire of the present invention is a variation on the second embodiment. In this embodiment, a non-air-permeable film structure is no longer provided, and the main body sound-proofing cotton and the auxiliary sound-proofing cotton are directly bonded together, that is, the outer main body sound-proofing cotton 210 and the outer auxiliary sound-proofing cotton 310 are directly bonded together to form the outer sound-proofing cotton; the inner main body sound-proofing cotton 220 and the inner auxiliary sound-proofing cotton 320 are directly bonded together to form the inner sound-proofing cotton.

[0052] refer to Fig.11 As shown, the fourth embodiment of the asymmetric low-noise tire of the present invention is a deformation based on the third embodiment. In this embodiment, the outer silent cotton and the inner silent cotton are symmetrically distributed on the radial center line CL of the tread, and the spacing between the outer silent cotton and the inner silent cotton is L1, preferably 1mm-50mm.

[0053] refer to Fig.13 FIG. 5 is a fifth embodiment of the asymmetric low noise tire of the present invention. This embodiment is a variation of the third embodiment. In this embodiment, in the tire circumferential direction, the outer silent sponge and the inner silent sponge are no longer Fig.12 The ordinary one-stage structure shown adopts that both the outer sound-proofing cotton and the inner sound-proofing cotton are set as a multi-stage aligned structure, and the segment spacing of adjacent outer sound-proofing cotton is equal to the segment spacing of adjacent inner sound-proofing cotton, both are L2, preferably 1mm-200mm.

[0054] refer to Fig.15 As shown in the figure, the sixth embodiment of the asymmetric low noise tire of the present invention is a variation of the third embodiment. In this embodiment, in the tire axial direction, the outer silent sponge and the inner silent sponge are no longer Fig.14 The ordinary traditional one-segment structure shown adopts that both the outer sound-proof cotton and the inner sound-proof cotton are set as a multi-segment structure, and the segment spacing of adjacent outer sound-proof cotton is equal to the segment spacing of adjacent inner sound-proof cotton, both are L3, preferably 1mm-50mm.

[0055] refer to Fig.16 As shown, the seventh embodiment of the asymmetric low-noise tire of the present invention is a deformation based on the third embodiment. In this embodiment, in the circumferential direction of the tire, the head and tail of the outer and inner silent cottons are staggered, and the staggered spacing is L4, preferably 1mm-50mm.

[0056] refer to Fig.17 As shown, the eighth embodiment of the asymmetric low-noise tire of the present invention is a deformation based on the fifth embodiment. In this embodiment, in the circumferential direction of the tire, the outer silent cotton and the inner silent cotton are still arranged as a multi-stage structure, but the outer silent cotton and the inner silent cotton are no longer aligned, and the head and tail of the outer silent cotton and the inner silent cotton are staggered respectively, and the staggered spacing is L4, preferably 1mm-50mm.

[0057] refer to Fig.18 As shown, the ninth embodiment of the asymmetric low-noise tire of the present invention is a further improvement on the third embodiment. In this embodiment, in the radial direction of the tire, the outer silent cotton and the inner silent cotton are both layered designs, and the number of layers is preferably 1-4 layers.

[0058] refer to Fig.19 As shown, the tenth embodiment of the asymmetric low-noise tire of the present invention is a further improvement on the eleventh embodiment. In this embodiment, in the radial direction of the tire, hollow structures are set between the layers in the layered structure of the outer side silent cotton and the inner side silent cotton.

[0059] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0060] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. An asymmetric low-noise tire, characterized in that: include: The tire body, the main silent cotton and the auxiliary silent cotton, the main silent cotton is located in the middle of the tread, and the radial center line of the main silent cotton coincides with the radial center line of the tread, and the main silent cotton and the auxiliary silent cotton are both bonded to the inner liner of the tire body, wherein the outer main silent cotton and the inner main silent cotton are both in "n" type structure, and the two form an "m" type main silent cotton; the outer auxiliary silent cotton and the inner auxiliary silent cotton are both in semicircular structure, and the center of the semicircle is located at the bottom of the auxiliary silent cotton The tire tread has a central part and coincides with the center line of the longitudinal groove of the pattern where the auxiliary sound-proofing cotton and the inner liner are bonded; the mass of the outer side of the tire tread is greater than the mass of the inner side of the tread; the mass of the outer side of the main sound-proofing cotton is less than the mass of the inner side of the main sound-proofing cotton; the mass of the outer side of the auxiliary sound-proofing cotton is less than the mass of the inner side of the auxiliary sound-proofing cotton; the mass difference between the outer and inner sides of the tire tread m1, the mass difference between the inner and outer sides of the main sound-proofing cotton m2, and the mass difference between the inner and outer sides of the auxiliary sound-proofing cotton m3 satisfy m2+m3=m1, and the unit is g.

2. The asymmetric low noise tire according to claim 1, characterized in that: The mass difference between the outside and inside of the tire tread is m1=M1×a, in g, where M1 is the tread weight and a is the sea-to-land ratio difference between the outside and inside of the tire tread pattern; the mass difference between the inside and outside of the main sound-absorbing cotton is m2=M2×a, in g, where M2 is the overall weight of the main sound-absorbing cotton; the mass difference between the inside and outside of the auxiliary sound-absorbing cotton is m3=M3×a, in g, where M3 is the overall weight of the auxiliary sound-absorbing cotton.

3. The asymmetric low noise tire according to claim 1, characterized in that: The width and depth of the outer body sound-proofing cotton and the inner body sound-proofing cotton are the same.

4. The asymmetric low noise tire according to claim 1, characterized in that: The asymmetric low-noise tire also includes a non-air-permeable film, which is located on a side of the main silent foam close to the tread.

5. The asymmetric low noise tire according to claim 1 or 4, characterized in that: The main body sound-proofing cotton and the auxiliary sound-proofing cotton are bonded together, wherein the outer main body sound-proofing cotton and the outer auxiliary sound-proofing cotton are bonded together to form the outer side sound-proofing cotton, and the inner main body sound-proofing cotton and the inner auxiliary sound-proofing cotton are bonded together to form the inner side sound-proofing cotton.

6. The asymmetric low noise tire according to claim 5, characterized in that: The outer side noise-reducing foam and the inner side noise-reducing foam are symmetrically distributed on the radial center line of the tread.

7. The asymmetric low noise tire according to claim 5, characterized in that: In the circumference of the tire, both the outer and inner silent pads have a multi-segment structure.

8. The asymmetric low noise tire according to claim 5, characterized in that: In the tire axial direction, both the outer and inner silent pads have a multi-segment structure.

9. The asymmetric low noise tire according to claim 5, characterized in that: In the circumferential direction of the tire, both ends of the outer and inner silent cotton are staggered.

10. The asymmetric low noise tire according to claim 5, characterized in that: In the radial direction of the tire, both the outer and inner silent pads have a layered structure.

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