Silent cotton tire and production method thereof

Abstract

The invention relates to the technical field of tire production, and particularly discloses a mute cotton tire and a production method thereof. The production method of the mute cotton tire comprises the following steps: a tire inner cavity cleaning step: cleaning the tire inner cavity to remove residual substances in the tire inner cavity; an adhesive spraying step: spraying an adhesive in the inner cavity of the tire; and a mute cotton bonding step: bonding the mute cotton to the tire inner cavity sprayed with the adhesive to obtain the mute cotton tire. In the mute cotton bonding step, 7-9 sections of mute cotton are bonded. The mute cotton tire produced by the production method can effectively reduce the noise of an inner cavity of the tire and the noise caused by friction between the tire and the ground, so that the noise reduction effect is achieved; compared with a mute cotton tire produced by adopting other methods, the mute cotton tire can be reduced by 8-9 decibels in the frequency range of 200-352Hz to the maximum extent; and the noise can be reduced by 1-5 decibels in other noise frequency ranges.

Description

Technical Field

[0001] The invention relates to the technical field of tire production, and in particular to a silent cotton tire and a production method thereof. Background Art

[0002] As the comfort of automobiles is increasingly valued in the market, the popularity and proportion of new energy vehicles are gradually increasing, and tire noise has become an important indicator affecting the comfort performance of automobiles. Therefore, a tire that can reduce noise is in demand in the market. Chinese patent CN214822387U discloses a tire silent cotton, which includes a car tire main body, the inner end face of the car tire main body is bonded with a uniformly distributed shock-absorbing adhesive layer, and the interior of the car tire main body is provided with a low-medium frequency noise sound-absorbing layer and a high-medium frequency noise sound-absorbing layer, and the outer end face of the low-medium frequency noise sound-absorbing layer is bonded with multiple shock-absorbing adhesive layers. Although the low-medium frequency noise sound-absorbing layer and the high-medium frequency noise sound-absorbing layer of the utility model can have a good sound absorption and noise reduction effect on the noise emitted by the tire, and effectively absorb and reduce the noise generated by cavity resonance; however, the structure of the tire of the utility model is complex and the production cost is high.

[0003] The mainstream method in the current market is to attach silent cotton to the inner cavity of the tire to absorb and reduce the noise of air vibration and resonance in the inner cavity of the tire and part of the vibration noise generated by the friction between the tire and the road. However, the inventor found in the research that the specific bonding process and method of the silent cotton in the tire have a huge difference in the silent effect of the silent cotton tire produced; a production method of a silent cotton tire with good silent effect needs to be explored. Summary of the invention

[0004] In order to overcome at least one of the technical problems existing in the prior art, the present invention provides a silent cotton tire and a production method thereof.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention first provides a method for producing a silent cotton tire, which comprises the following steps:

[0007] Tire cavity cleaning steps: Clean the tire cavity to remove residual substances in the tire cavity;

[0008] Adhesive spraying step: spraying adhesive in the inner cavity of the tire;

[0009] The step of bonding the silent cotton is as follows: bonding the silent cotton to the inner cavity of the tire sprayed with adhesive to obtain the silent cotton tire;

[0010] In the sound-proof cotton bonding step, 7 to 9 sections of sound-proof cotton are bonded.

[0011] One of the innovative points of the present invention is that 7 to 9 sections of silent cotton are bonded together; the tire using the multi-section silent cotton of the present invention has a good ability to absorb and reduce the noise generated by the tire.

[0012] In the present invention, the number of the silent cotton is 7, 8, and 9 according to the different tire specifications and sizes;

[0013] For example, bonding 7 sections of silent cotton is suitable for: outer diameter 620~720mm.

[0014] For example, bonding 8 sections of silent cotton is suitable for: outer diameter 721~800mm.

[0015] For example, bonding 9 sections of silent cotton is suitable for: outer diameter 801~850mm.

[0016] Preferably, in the step of bonding the sound-absorbing cotton, each section of the sound-absorbing cotton has a length of 200 to 300 mm and a width of 120 to 160 mm.

[0017] Most preferably, in the step of bonding the silent cotton, each piece of silent cotton has a length of 250 mm and a width of 150 mm.

[0018] Preferably, the sound-proof cotton is pasted in the center.

[0019] Preferably, in the step of bonding the sound-absorbing cotton, a gap is left between each section of the sound-absorbing cotton.

[0020] Preferably, in the step of bonding the sound-absorbing cotton, the gaps have the same average value.

[0021] Preferably, in the step of bonding the sound-absorbing cotton, the value of the gap is L; the gap L is determined according to the following formula: Gap L = (2R*π-250*n) / n.

[0022] The inventors discovered in their research that the selection of the number of segments of silent cotton and the setting of the gaps have an important influence on the sound absorption and noise reduction effect of silent cotton tires; the research shows that the silent cotton tires produced by setting the number of silent cotton segments and the gaps between the silent cotton segments in the manner of the present invention have a good ability to absorb and reduce the noise generated by the tire.

[0023] Preferably, the material of the sound-absorbing cotton is Dingqing foam material.

[0024] Preferably, in the adhesive spraying step, the specific method of spraying the adhesive is: the adhesive spraying direction is parallel to the circumferential direction of the tire, and 2 to 4 parallel spray layers are sprayed, and the width of each spray layer is 10 to 20 mm.

[0025] Most preferably, the specific method of spraying the adhesive is: the adhesive spraying direction is parallel to the circumferential direction of the tire, and three parallel spray layers are sprayed, and the width of each spray layer is 15 mm.

[0026] The inventors found in the study that the spraying process of the adhesive plays an important influence on the sound absorption and noise reduction effect of the produced tires; the inventors were surprised to find in the study that the tires produced by the above-mentioned spraying process (that is, the adhesive spraying direction is parallel to the circumference of the tire, 2 to 4 parallel spray layers are sprayed, and the width of each spray layer is 10 to 20 mm) can make the sound-proof cotton tightly bonded to the inner cavity of the tire through the spray layer in the part where the spray layer is sprayed, and only fit in the part where the spray layer is not sprayed, and an air layer will be formed in the middle; it is this method of crossing the spray layer and the air layer that has better sound absorption and noise reduction effect; compared with the tires produced by spraying all the spray layers, the sound absorption and noise reduction effect of the produced tires can be reduced by 8-9 decibels in the frequency range of 200-352Hz.

[0027] Preferably, the spraying is performed using a spray gun.

[0028] Preferably, in the tire inner cavity cleaning step, the cleaning is performed using a laser cleaning platform.

[0029] Preferably, the laser cleaning platform has a power of 400-600 W, a pulse width of 120-150 ns, and a pulse frequency of 40-60 kHz.

[0030] Preferably, the laser cleaning platform has a power of 500 W, a pulse width of 130 ns, and a pulse frequency of 50 kHz.

[0031] The inventor found in further research that different cleaning methods of the tire cavity affect the bonding problem of the silent cotton. The inventor found in a large number of studies that before bonding the sound-absorbing cotton, a laser cleaning platform is used for cleaning; especially a laser cleaning platform with a power of 400-600W, a pulse width of 120-150ns, and a pulse frequency of 40-60kHz is used for cleaning; it can make the silent cotton and the tire fit firmly, which further helps to improve the sound absorption and noise reduction effect.

[0032] The present invention also provides a silent cotton tire produced by the production method.

[0033] Beneficial effects: The present invention provides a new silent cotton tire and a production method thereof; by bonding 7 to 9 sections of silent cotton in the inner cavity of the tire and adopting the cleaning and bonding method of the present invention for the inner cavity of the tire, the silent cotton tire produced can effectively reduce the noise in the inner cavity of the tire and the noise caused by the friction between the tire and the ground, thereby achieving a noise reduction effect; compared with silent cotton tires produced by other methods, the present invention can reduce 8 to 9 decibels in the frequency range of 200 to 352 Hz; and can reduce 1 to 5 decibels in other noise frequency ranges. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The silent cotton tire is produced by the silent cotton tire production method of the present invention. DETAILED DESCRIPTION

[0035] The present invention is further explained below in conjunction with specific examples, but the examples do not limit the present invention in any form.

[0036] Example 1 Production of Quiet Cotton Tire

[0037] (1) Tire inner cavity cleaning step: cleaning the inner cavity of the tire to remove residual substances in the inner cavity of the tire; specifically, a laser cleaning platform is used for cleaning; the laser cleaning platform has a power of 500 W, a pulse width of 130 ns, and a pulse frequency of 50 kHz;

[0038] (2) Adhesive spraying step: three spray guns are used at a uniform distance, and the nozzles are placed above the inner cavity of the tire to spray the adhesive; wherein the adhesive spraying direction is parallel to the circumference of the tire, and three parallel spray layers are sprayed, and the width of each spray layer is 15 mm;

[0039] (3) Quiet cotton bonding step: Select 7 sections of quiet cotton made of Dingqing foam material, bond the 7 sections of quiet cotton to the center of the tire cavity sprayed with adhesive, and use a pressing device to press them evenly to obtain the quiet cotton tire;

[0040] Among them, the length of each section of sound-proof cotton is 250 mm and the width is 150 mm; there is a gap between each section of sound-proof cotton, and the gap has the same average value; the gap L is determined according to the following formula: Gap L = (2R*π-250*n) / n.

[0041] Example 2 Production of Quiet Cotton Tire

[0042] (1) Tire inner cavity cleaning step: cleaning the inner cavity of the tire to remove residual substances in the inner cavity of the tire; specifically, a laser cleaning platform is used for cleaning; the laser cleaning platform has a power of 400 W, a pulse width of 120 ns, and a pulse frequency of 40 kHz;

[0043] (2) Adhesive spraying step: using three spray guns at a uniform distance, with the nozzles spraying the adhesive above the inner cavity of the tire; wherein, the adhesive spraying direction is parallel to the circumference of the tire, and four parallel spray layers are sprayed, and the width of each spray layer is 10 mm;

[0044] (3) Quiet cotton bonding step: Select 8 sections of quiet cotton made of Dingqing foam material, bond the 8 sections of quiet cotton to the center of the inner cavity of the tire sprayed with adhesive, and use a pressing device to press them evenly to obtain the quiet cotton tire;

[0045] Among them, the length of each section of sound-proof cotton is 200 mm and the width is 120 mm; there is a gap between each section of sound-proof cotton, and the gap has the same average value; the gap L is determined according to the following formula: Gap L = (2R*π-250*n) / n.

[0046] Example 3 Production of Quiet Cotton Tire

[0047] (1) Tire inner cavity cleaning step: cleaning the inner cavity of the tire to remove residual substances in the inner cavity of the tire; specifically, a laser cleaning platform is used for cleaning; the laser cleaning platform has a power of 600 W, a pulse width of 150 ns, and a pulse frequency of 60 kHz;

[0048] (2) Adhesive spraying step: using three spray guns at a uniform distance, with the nozzles spraying the adhesive above the inner cavity of the tire; wherein, the adhesive spraying direction is parallel to the circumferential direction of the tire, and two parallel spray layers are sprayed, and the width of each spray layer is 20 mm;

[0049] (3) Quiet cotton bonding step: Select 9 sections of quiet cotton made of Dingqing foam material, bond the 9 sections of quiet cotton to the center of the tire cavity sprayed with adhesive, and use a pressing device to press them evenly to obtain the quiet cotton tire;

[0050] Among them, the length of each section of sound-proof cotton is 300 mm and the width is 160 mm; there is a gap between each section of sound-proof cotton, and the gap has the same average value; the gap L is determined according to the following formula: Gap L = (2R*π-250*n) / n.

Claims

1. A method for producing a silent cotton tire, characterized in that: The following steps are included: Tire cavity cleaning steps: Clean the tire cavity to remove residual substances in the tire cavity; Adhesive spraying step: spraying adhesive in the inner cavity of the tire; The step of bonding the silent cotton is as follows: bonding the silent cotton to the inner cavity of the tire sprayed with adhesive to obtain the silent cotton tire; In the sound-proof cotton bonding step, 7 to 9 sections of sound-proof cotton are bonded.

2. The method for producing a silent cotton tire according to claim 1, characterized in that: In the step of bonding the silent cotton, each section of the silent cotton has a length of 200 to 300 mm and a width of 120 to 160 mm.

3. The method for producing a silent cotton tire according to claim 1, characterized in that: In the step of bonding the silent cotton, each section of the silent cotton has a length of 250 mm and a width of 150 mm.

4. The method for producing a silent cotton tire according to claim 1, characterized in that: The sound-absorbing cotton shown is pasted in the center.

5. The method for producing a silent cotton tire according to claim 1, characterized in that: During the step of gluing the silent cotton, a gap is left between each section of the silent cotton.

6. The method for producing a silent cotton tire according to claim 4, characterized in that: In the step of bonding the sound-proof cotton, the gaps are of the same average value.

7. The method for producing a silent cotton tire according to claim 4, characterized in that: In the step of bonding the sound-absorbing cotton, the value of the gap is L; the gap L is determined according to the following formula: Gap L = (2R*π-250*n) / n. Preferably, the material of the sound-absorbing cotton is Dingqing foam material.

8. The method for producing a silent cotton tire according to claim 1, characterized in that: In the adhesive spraying step, the specific method of spraying the adhesive is: the adhesive spraying direction is parallel to the circumferential direction of the tire, and 2 to 4 parallel spray layers are sprayed, and the width of each spray layer is 10 to 20 mm. Most preferably, the specific method of spraying the adhesive is: the adhesive spraying direction is parallel to the circumferential direction of the tire, and three parallel spray layers are sprayed, and the width of each spray layer is 15 mm.

9. The method for producing a silent cotton tire according to claim 1, characterized in that: In the tire inner cavity cleaning step, the cleaning is performed using a laser cleaning platform.

10. The silent cotton tire produced by the production method according to any one of claims 1 to 9.

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