Sound-absorbing cotton containing ribbon, mute tire and assembly method

Abstract

The invention provides sound-absorbing cotton containing a ribbon, a mute tire and an assembly method, belongs to the technical field of mute tires, and can solve the problems that the sound-absorbing cotton is complex in treatment process before being pasted, glue or gum and the like are high in cost, the sound-absorbing cotton is difficult to disassemble, the mounting firmness is poor, and the sound-absorbing cotton is easy to fall off. According to the technical scheme, the sound-absorbing cotton containing the ribbons is characterized in that the ribbons are arranged on the surface of a sound-absorbing cotton mounting plane in a matrix mode, the ribbon column number q and the ribbon row number p meet the # imgabs0 # formula, p represents the ribbon row number of the sound-absorbing cotton, and the value is an integer; f represents the total tension value required to be provided by the sound-absorbing cotton under the limit working condition; fm represents the maximum load of the stress position of the sound-absorbing cotton; b represents the numerical safety multiple of the sound-absorbing cotton ribbon; q represents the column number of the sound-absorbing cotton ribbons, and the value range of q is 8-10. The sound-absorbing cotton containing the ribbon is applied to preparation of a mute tire, the sound-absorbing cotton containing the ribbon and the tire are installed and fixed in a fixed knot mode, and the sound-absorbing cotton containing the ribbon has the advantages that the manufacturing process is simplified, the production cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of silent tires, and in particular relates to a silent tire containing a cable tie and sound-absorbing cotton, and an assembly method. Background Art

[0003] A tire is a hollow structure. It is used by being installed on a rim and inflated to a corresponding pressure. During the rolling process of the tire, the gas in its internal cavity follows the vehicle to run at high speed. The resonance generated by the road excitation is transmitted to the vehicle cab through the tire, axle, etc., forming an unbearable low-frequency noise with a frequency of 200 to 260 Hz, which is the cavity resonance noise of the tire. The most common and effective way to deal with the cavity resonance noise generated by the tire rim assembly during driving is to adjust the tire structure design or install sound-absorbing cotton inside the tire.

[0004] In recent years, new energy vehicles have experienced explosive growth, which has put forward more stringent comprehensive performance requirements for automobile tires. Especially in terms of noise, given the special characteristics of electric power and quietness of new energy vehicles, the various noises generated by tires during driving have become more important assessment indicators for new energy vehicles. Due to the special nature of new energy vehicles without engines, many new energy vehicle-specific tires on the market are currently equipped with sound-absorbing sponges or can be installed as optional components. The common material of sound-absorbing sponges is polyurethane foam, which is a flat rectangular block with an overall thickness of generally between 3-5cm. Figure 1 As shown, sound-absorbing sponges are usually installed on the inner side of the tire crown in the form of adhesive. The installation threshold of sound-absorbing sponges is relatively low, but in actual use, it is found that many sound-absorbing sponges are not installed firmly and are prone to falling off. For sound-absorbing sponges installed by adhesive adhesive, the inner surface of the tire must be cleaned and the surface laser treated, and the sound-absorbing sponges must meet multiple technical parameter standards to maintain a long service life.

[0005] Therefore, the present invention provides a sound-absorbing sponge containing a cable tie, a silent tire and an assembly method to solve the above-mentioned problems existing in the sound-absorbing sponge. Summary of the invention

[0006] In view of the technical problems that the sound-absorbing cotton has complex pre-treatment process, high cost of glue or adhesive, poor installation firmness and easy falling off, the present invention proposes a sound-absorbing cotton containing a cable tie, a silent tire and an assembly method, which does not need to use adhesive or adhesive strips, does not need to be installed by adhesive pasting, and does not need to perform surface treatment on the inner wall of the tire. It can achieve the same level of noise reduction effect as the sound-absorbing cotton installed by traditional adhesive pasting, and has the characteristics of simplifying the production process, reducing production costs, improving production efficiency, and improving the durability and sustainable use effect of the sound-absorbing cotton.

[0007] In order to achieve the above-mentioned object, the present invention provides a sound-absorbing sponge containing a cable tie, wherein the cable ties are arranged in a matrix on the surface of the sound-absorbing sponge installation plane, and the number of cable tie columns q and the number of cable tie rows p satisfy

[0008]

[0009] In the formula, p represents the number of rows of sound-absorbing cotton tie tape, which is an integer; F represents the overall tensile force required under the extreme working conditions of the sound-absorbing cotton; F m It represents the maximum load at the stress position of the sound-absorbing cotton; b represents the numerical safety multiple of the sound-absorbing cotton tie; q represents the number of columns of the sound-absorbing cotton tie, and the value range of q is 8 to 10.

[0010] In some embodiments, F satisfies

[0011]

[0012] In the formula, T represents the thickness of the sound-absorbing cotton, L represents the length of the sound-absorbing cotton, W represents the width of the sound-absorbing cotton, ρ represents the density of the sound-absorbing cotton, and s represents the response time of the vehicle speed being decelerated from 100 km / h to 0 in the actual vehicle evaluation;

[0013] F m Satisfy F m =TS×A / 10 3 , where TS represents tensile strength, in kPa; A represents the average original cross-sectional area of ​​the sound-absorbing cotton sample tie, in mm 2 .

[0014] In some embodiments, the sound-absorbing sponge with cable ties is obtained by partially cutting the sound-absorbing sponge in a single row and alternating left and right manner. The above-mentioned cutting method can avoid or delay the acceleration and deceleration during the use of the tire, which causes the incision position to tear and cause rapid fracture and failure.

[0015] In some embodiments, the cable tie containing the cable tie sound-absorbing sponge is cut perpendicular to the plane of the sound-absorbing sponge body, and the cross-sectional shape of the cable tie is one of square, triangle or rectangle. The above cutting method can avoid small-angle trouser-shaped tearing caused by directly cutting the rectangular sound-absorbing sponge body.

[0016] On the other hand, the present invention provides a silent tire, including any of the above-mentioned sound-absorbing sponges with tie bands, which are installed on the inner wall of the silent tire by means of a fixing knot. The silent tire provided by the present invention fixes the sound-absorbing sponge on the inner wall of the tire by means of a fixing knot, which saves the cost of the back film or glue when installing the traditional sound-absorbing sponge, reduces the cost of raw materials, and provides the sound-absorbing sponge with better durability and sustainable use effect; moreover, the tire produced by the present invention does not need to be coated with a rubber strip or a thick layer of colloid on the inner wall of the tire, so that the tire is significantly superior to traditional silent tires and similar products in terms of rolling resistance, heat generation, and durability.

[0017] In some embodiments, the inner wall of the silent tire is provided with rubber fixing holes arranged in a ring matrix, and the sound-absorbing sponge with a cable tie is installed on the rubber fixing holes by means of a fixing knot. The present invention fixes the sound-absorbing sponge body to the inner wall of the tire by means of a cable tie by means of a fixing knot, which greatly improves the firmness of the sound-absorbing sponge cable tie and ensures that the sound-absorbing sponge does not fall off during its life cycle.

[0018] The present invention also provides a method for assembling the above-mentioned silent tire, comprising the following steps:

[0019] When preparing a semi-finished tire, a rubber sheet application step is added after the inner liner is pressed out, and a rubber sheet application step is added after the tire blank is formed to obtain the tire blank;

[0020] The rubber thickness of the middle area of ​​the vulcanizing bladder with the largest inflation diameter is increased and concave cavities are arranged in an array along the circumferential direction in the thickened area, so that a tire with fixed holes on the inner wall is obtained after vulcanization;

[0021] The sound-absorbing sponge with cable ties is installed to the fixing holes on the inner wall of the tire by means of two-stage fixing knots to obtain a silent tire.

[0022] In some embodiments, embryo preparation specifically includes the following steps:

[0023] When preparing the semi-finished tire molding product, after the inner liner is pressed out, the film is applied to the inner liner at a fixed interval;

[0024] After the conventional tire blank is formed, the film is attached to the tire at a fixed angle and compacted by a roller to obtain the tire blank. The present invention adds two film application steps during the preparation of the tire blank to prepare for the amount of rubber reserved for the fixed hole positions.

[0025] In some embodiments, the preparation of a tire with fixed holes on the inner wall specifically includes the following steps:

[0026] The rubber thickness is increased in the middle area of ​​the vulcanization bladder with the largest inflation diameter, and several rows of hole cavities are arranged in an array along the circumferential direction on the surface of the thickened area, and a convex structure is arranged in each cavity to form fixed holes by vulcanization;

[0027] During vulcanization, after the thickened area in the middle of the vulcanization bladder contacts the plane of the center part of the embryo crown of the tire, the convex structure opens, and the rubber flows to the concave cavity for smooth vulcanization, thereby obtaining a tire with fixed holes on the inner wall. The present invention designs the vulcanization bladder, and obtains a tire with fixed holes on the inner wall after vulcanization.

[0028] In some embodiments, the installation of the sound-absorbing sponge containing cable ties on the inner wall of the tire specifically includes the following steps:

[0029] Take the end of the cable tie connected to the sound-absorbing foam body as the starting position of the fixed knot, start from the outside of the fixed hole beam, wrap around the outside of the fixed hole beam and wrap several circles, then insert the cable tie from the front end of the fixed hole beam and pass it out from the left end to get a fixed knot;

[0030] One end of a fixed knot is passed through and wound upward along the front end of the fixed hole beam, and the fixed hole beam is wound around the rear side of the fixed hole beam for several turns before winding out to the end of the tie at the front end, and the front end of the fixed hole beam and the bottom of the front tie are passed through to the starting end of the second fixed knot to obtain a two-stage fixed knot, and the assembly of the sound-absorbing cotton with the tie and the tire with the fixed hole on the inner wall is completed to obtain a silent tire. The present invention uses two-stage fixed knots to wrap and knot the sound-absorbing cotton tie and the fixed hole beam, which is very firm and not easy to untie, simple, effective and cost-saving.

[0031] Compared with the prior art, the advantages and positive effects of the present invention are:

[0032] 1. The present invention provides a sound-absorbing sponge with a tie. By calculating the working conditions of the target tire, the target design number of rows and columns of the sound-absorbing sponge tie is determined, and the sound-absorbing sponge with a tie arranged in a matrix on the surface of the sound-absorbing sponge installation plane is obtained, which can reduce the waste of surplus materials during processing and ensure that the sound-absorbing sponge meets the actual use conditions of the tire; by adopting a single-row left-right alternating local cutting processing method for the sound-absorbing sponge, the acceleration and deceleration during the use of the tire can avoid or delay the trouser-shaped tearing at the incision position and the rapid fracture failure; after cutting, the trouser-shaped sound-absorbing sponge with a tie is perpendicular to the plane of the sound-absorbing sponge main body, which can avoid the small-angle trouser-shaped tearing caused by direct cutting of the rectangular sound-absorbing sponge main body.

[0033] 2. The silent tire provided by the present invention can achieve a good effect of absorbing cavity resonance sound. Under the condition of silent and comfortable performance, the manufacturing process is greatly simplified; the sound-absorbing cotton containing tie-ties is installed in the rubber fixing holes arranged in a ring matrix on the inner wall of the tire in the form of fixed knots, eliminating the use of conventional adhesive installation methods such as film, and there is no need to perform surface treatment on the inner wall of the tire, which simplifies the process flow and reduces production costs; the fixed knots share the pulling force of the relative movement between the sound-absorbing cotton and the inner wall of the tire in a circular matrix arrangement, which greatly improves the firmness of the sound-absorbing cotton tie-ties and can ensure that the sound-absorbing cotton does not fall off during its life cycle; since there is no need to coat the inner wall of the tire with rubber strips or a thick layer of rubber, the tire is superior to traditional silent tires and similar products in terms of rolling resistance, heat generation, and durability.

[0034] 3. In the silent tire assembly method of the present invention, the vulcanization bladder is locally thickened in the middle area of ​​the bladder where the inflation diameter is the largest, and a row of concave cavities are longitudinally arranged in the middle of the thickened area to form fixed holes for vulcanization. In addition, ineffective vulcanization caused by the bladder turning out can be effectively avoided, and the processing procedure is simpler and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure in which the sound-absorbing sponge is installed on the inner side of the tire crown in the prior art;

[0036] Figure 2 A schematic diagram of the structure of the sound-absorbing sponge with a cable tie provided in an embodiment of the present invention being installed in a fixed hole on the inner wall of a tire;

[0037] Figure 3 A schematic diagram of the structure of the sound-absorbing sponge with a cable tie provided in an embodiment of the present invention;

[0038] Figure 4 The cross section of the sound-absorbing sponge with a cable tie provided in the embodiment of the present invention ( Figure 3 (E) is a schematic diagram of a square structure;

[0039] Figure 5 A schematic diagram of a structure in which a sound-absorbing foam with a cable tie having a triangular cross section is provided in an embodiment of the present invention;

[0040] Figure 6 A schematic diagram of a structure in which the cross section of the sound-absorbing sponge with a cable tie provided by an embodiment of the present invention is rectangular;

[0041] Figure 7 A schematic diagram of the structure in which each group of tie ties in a tie-tie sound-absorbing sponge matrix arrangement provided by an embodiment of the present invention is perpendicular to the plane of the sound-absorbing sponge body;

[0042] Figure 8 for Figure 7 A partial enlarged schematic diagram of point F in the middle;

[0043] Fig. 9 This is a schematic diagram of the structure of a trouser-shaped cut formed by flat cutting of conventional sound-absorbing cotton;

[0044] Fig.10 A structural schematic diagram of one embodiment of a cutting process for sound-absorbing sponge with cable ties provided in an embodiment of the present invention;

[0045] Fig.11 for Fig.10 Schematic diagram of the structure of the sound-absorbing sponge after cutting;

[0046] Fig.12 A schematic structural diagram of another embodiment of a cutting process for sound-absorbing sponge with cable ties provided in an embodiment of the present invention;

[0047] Fig.13 for Fig.12 Schematic diagram of the structure of the sound-absorbing sponge after cutting;

[0048] Fig.14 A schematic structural diagram of a preferred embodiment of a cutting process for sound-absorbing sponge with cable ties provided in an embodiment of the present invention;

[0049] Fig.15 for Fig.14 Schematic diagram of the structure of the sound-absorbing sponge after cutting;

[0050] Fig.16 A schematic diagram of the structure of a silent tire provided by an embodiment of the present invention;

[0051] Fig.17 A longitudinal cross-sectional view of a silent tire provided by an embodiment of the present invention;

[0052] Fig.18 This is a schematic diagram of the structure of the inner lining layer with the film applied according to an embodiment of the present invention;

[0053] Fig.19 A schematic diagram of the structure of a vulcanization bladder provided by an embodiment of the present invention;

[0054] Fig. 20 A front view of the overall thickened area of ​​the vulcanizing bladder provided by an embodiment of the present invention;

[0055] Fig.21 for Fig. 20 A partial enlarged schematic diagram of the G in the middle;

[0056] Fig. 22 A schematic diagram of the structure of the first section of the fixing knot provided in an embodiment of the present invention;

[0057] Fig.23 A schematic diagram of the structure of the second section of the fixing knot provided in an embodiment of the present invention;

[0058] In the attached drawings, 1. conventional sound-absorbing cotton; 2. sound-absorbing cotton with cable ties; 21. cable ties; 3. fixing holes; 4. fixing knots. DETAILED DESCRIPTION

[0059] In order to be able to understand the characteristics and technical contents of the embodiments of the present invention in more detail, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the embodiments described below are only part of the embodiments of the present invention, rather than all the embodiments of the present invention. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection requested by the present invention.

[0060] The present invention provides a sound-absorbing sponge containing a cable tie, a silent tire and an assembly method. Figure 2This is a schematic diagram of the structure of the silent tire obtained by the present invention. In the present invention, the sound-absorbing cotton containing the cable tie is fixed to the inner wall of the tire in the form of a fixed knot, which simplifies the production process, reduces the cost of raw materials, and at the same time provides the sound-absorbing cotton with better durability and sustainable use effect.

[0061] refer to Figure 3 As shown, an embodiment of the present invention provides a sound-absorbing cotton with a tie 2, and a matrix-arranged sound-absorbing cotton tie is set on the installation plane surface of the sound-absorbing cotton. Specifically, by calculating the working conditions of the target tire, the target design number of rows and columns of the sound-absorbing cotton tie is determined to ensure that the sound-absorbing cotton can meet the actual use conditions of the tire; and the cutting process of the sound-absorbing cotton is improved to reduce the waste of raw materials, so as to prepare a sound-absorbing cotton component with a tie that meets the requirements.

[0062] The sound-absorbing sponge installation plane of the present invention is provided with a matrix-arranged sound-absorbing sponge tie band, and the number of columns q and the number of rows p of the tie band satisfy

[0063]

[0064] In the formula, p represents the number of rows of sound-absorbing cotton tie tapes, which is an integer; z represents the recommended total number of tie tape matrix; q represents the number of columns of sound-absorbing cotton tie tapes, and the value of q ranges from 8 to 10.

[0065] Under extreme deceleration conditions, the sound-absorbing sponge tends to separate from the inner wall of the tire due to inertia. Ignoring the friction between the inner wall of the tire and the sound-absorbing sponge, the total inertia tension value F is distributed to the maximum load at the force position of the cable tie, and the minimum recommended number of cable ties is

[0066]

[0067] In the formula, F represents the total tensile force required under the extreme working conditions of the sound-absorbing sponge, Fm represents the maximum load at the force-bearing position of the sound-absorbing sponge, and b represents the numerical safety multiple of the sound-absorbing sponge tie.

[0068] From the above, we can get:

[0069] For passenger car tires, the number of cable tie rows q is selected from 8 to 10 according to the inner circumference of the tire. The selection principle is shown in Table 1:

[0070] Table 1 Principles for selecting the number of cable tie rows q

[0071] Tire inner diameter (mm) ≤600 600～720 ≥720 Number of columns in the tie matrix q 8 9 10

[0072] In the above formula of the present invention, F=ma, where m represents the mass of the sound-absorbing cotton, and a represents the extreme working condition acceleration; wherein m=T×L×W×ρ, where T represents the thickness of the sound-absorbing cotton, L represents the length of the sound-absorbing cotton, W represents the width of the sound-absorbing cotton, and ρ represents the density of the sound-absorbing cotton; the extreme working condition acceleration a is calculated according to the convention based on the response time s of the actual vehicle evaluation vehicle speed decelerating from 100 km / h to 0,

[0073] From this we can get,

[0074] The maximum load at the stress position of the sound-absorbing sponge meets F m =TS×A / 10 3 , where TS represents tensile strength, in kPa; A represents the average original cross-sectional area of ​​the sound-absorbing cotton sample tie, in mm 2 .

[0075] The sound-absorbing sponge with cable ties of the present invention is prepared by the following pretreatment method: the designated position of the sound-absorbing sponge is partially cut in a single row and left-right alternating manner to obtain a matrix-arranged cable-ties type sound-absorbing sponge with a length and a cross-sectional shape that meets the requirements, and the sound-absorbing sponge is prepared by the following pretreatment method: Figure 4-Figure 6 As shown, the cross-sectional shape is one of a square, a triangle or a rectangle; the above-mentioned cutting method can avoid or delay the acceleration and deceleration during the use of the tire, which leads to the trouser-shaped tearing at the incision position and causes rapid fracture failure; in order to avoid the possibility of small-angle trouser-shaped tearing caused by direct cutting of the rectangular sound-absorbing cotton body, the sound-absorbing cotton tie is designed to be longitudinally integrated, and each group of tie in the matrix arrangement is perpendicular to the plane of the sound-absorbing cotton body, such as Figure 7 As shown, the details of the single-row cable tie are as follows Figure 8 shown.

[0076] Conventional sound-absorbing sponges are generally cut flat, and after cutting, they will form a reference Fig. 9 The trouser cut shown. Fig.10 , Fig.12 and Fig.14 The figure shows the cutting method of the sound-absorbing sponge of the present invention, wherein the shaded part is the part to be cut, and the structure of the sound-absorbing sponge after cutting is respectively referred to Fig.11 , Fig.13 and Fig.15 As shown, the present invention adjusts the cutting method of the sound-absorbing sponge and removes excess material to obtain a tie strap perpendicular to the plane of the main body of the sound-absorbing sponge. Compared with the conventional flat cutting process of the sound-absorbing sponge, the present invention Fig.12 The cutting design can reduce about 50% of the waste during processing. Fig.14 The cutting design can reduce more than 80% of the waste of residual materials. When cutting, the bottom of the cable tie is perpendicular to the main body of the sound-absorbing foam and the upper part of the cable tie is bent, which can avoid small angle trouser tearing during cutting and reduce the waste of raw materials.

[0077] refer to Fig.16 and Fig.17 As shown, an embodiment of the present invention provides a silent tire, and the inner wall of the silent tire is provided with the above-mentioned sound-absorbing cotton containing tie straps. In a preferred embodiment, the inner wall of the tire is provided with rubber fixing holes 3 arranged in a ring matrix, and the sound-absorbing cotton containing tie straps is installed on the fixing holes 3 of the inner wall of the silent tire by means of fixing knots 4. Among them, the rubber fixing holes 3 are designed in multiple columns in the tire at the crown part, and the number of single columns of the fixing holes 3 is consistent with the number of tie strap rows in the sound-absorbing cotton tie strap matrix, and the number of columns of the fixing holes 3 is consistent with the number of tie strap columns in the sound-absorbing cotton tie strap matrix. Unlike the existing combined silent tire products, which are all equipped with rigid components, and the rigid components are independently installed in the tire cavity to play a supporting role, the technical solution of the present invention does not require rigid components when installing sound-absorbing cotton in the silent tire, and the sound-absorbing cotton is firmly fixed to the tire to meet the use requirements, and the sound-absorbing cotton has a long service life.

[0078] The fixed hole positions 3 on the inner wall of the silent tire of the present invention are formed by a special tire blank through a vulcanization process, wherein the tire blank is prepared by adding an application process after the inner liner layer is pressed out when preparing the tire molding semi-finished product, and adding a tire lining affixing process after the tire blank is molded; the vulcanization capsule is locally thickened in a circumferential array in the middle area of ​​the capsule with the largest inflation diameter, that is, the area in contact with the center of the crown, and a row of concave cavities is longitudinally arranged in the middle of the thickened area for vulcanization to form the fixed hole positions 3.

[0079] The embodiment of the present invention also provides a method for assembling the above-mentioned silent tire, comprising the following steps:

[0080] S1. Embryo preparation:

[0081] S1.1. To reserve the amount of rubber for the fixed holes, when preparing the semi-finished tire molding product, after the inner liner is pressed out, add a film applying process, and apply the pre-cut long strips of film of equal thickness, length and width and the same length as the width of the sound-absorbing cotton to the inner liner at a fixed spacing consistent with the spacing of the sound-absorbing cotton tie bands. The structural schematic diagram of the inner liner after the film is applied is shown in the figure below. Fig.18 As shown;

[0082] S1.2. After the conventional tire blank is formed, a step of adding a film to the tire is added. The tire blank is rotated and a device inserted into the tire is used to attach the cut film at a fixed angle in the circumferential direction of the tire and compact it with a roller to obtain a tire blank.

[0083] S2. Manufacturing of tires with fixed holes on the inner wall:

[0084] S2.1. References Figure 19-21As shown, the overall thickness of the rubber in the corresponding area is increased in the middle area of ​​the vulcanization bladder where the inflation diameter of the vulcanization bladder is the largest. Several rows of hole cavities are arranged in an array along the circumferential direction on the surface of the thickened area, and a convex structure is arranged in each cavity to form a fixed hole 3 by vulcanization;

[0085] S2.2, when the tire is vulcanized, after the middle area of ​​the vulcanization bladder contacts the plane of the center part of the tire embryo crown, the surface of the vulcanization bladder returns to a nearly flat state, the convex structure opens, and the rubber flows to the hole cavity and is vulcanized smoothly, thereby obtaining a tire with a fixed hole 3 on the inner wall;

[0086] S3, with cable tie, sound-absorbing foam and tire assembly:

[0087] S3.1. References Fig. 22 As shown, it is the first section of the fixed knot tying path BC, with one end of the cable tie connected to the sound-absorbing sponge body as the starting position B of the fixed knot 4, starting from the outside of the fixed hole beam, winding out from the outside of the beam and rotating 3 times, and then passing through the cable tie from the front end of the fixed hole beam and passing out from the left end, the passing end is C, after the first section of the cable tie is tied around the fixed hole beam, an initial fixed knot 4 is formed. This fixed knot 4 is different from the traditional slipknot. It is based on the routing method of medical surgical knots, and two groups are wound together before forming a knot. With the characteristics of large friction on the porous surface of the polyurethane foam, it has the advantages of good fixation and not easy to open the knot;

[0088] S3.2. During the driving process, the tires are subject to frequent acceleration and deceleration operations, which puts forward higher requirements on the fixing firmness of the sound-absorbing sponge. In order to improve the firmness and anti-unknot degree of the sound-absorbing sponge, refer to Fig.23 As shown, a second section of the fixing knot tying path CD is added on the basis of the first section of the fixing knot. It is wound upward from the outlet end C along the front end of the fixed hole beam, and after winding around the rear side of the fixed hole beam for one circle, the end point of the cable tie wound to the front end is at the front of the fixed hole beam. After the bottom of the front end cable tie is inserted into the second starting section for two circles, it is passed out, and the outlet end is D, completing the assembly of the cable tie sound-absorbing cotton 2 and the tire with the fixed hole 3 on the inner wall to obtain a silent tire.

[0089] The tire curing bladder is a hollow thin-walled rubber product used to make tires. The curing bladder is placed in the inner cavity of the tire embryo, and nitrogen, hot water and other media are introduced into the bladder to vulcanize the tire embryo. During the vulcanization process, the tire bladder and the tire mold are inflated and expanded inside the bladder to squeeze the tire embryo, so that the tire embryo is closely attached to the surface of the mold cavity to form tire patterns and pattern words. The present invention performs a local thickening design of the circumferential array in the middle area of ​​the bladder with the largest inflation diameter, that is, the contact area with the center of the crown, and longitudinally arranges a row of concave cavities in the middle of the thickened area, so that the bladder and the tire embryo can quickly contact and the rubber can quickly flow into the concave cavity after contact, forming a fixed hole position 3 structure with a thicker frame around the middle thin sheet. The middle thin sheet can be removed by a punching device later, and a tire with a fixed hole position 3 on the surface can be obtained smoothly. It can also ensure that after high-pressure inflation, the convex structure in the concave cavity will not cause the fixed hole position 3 to fail to vulcanize due to turning out, and the processing process is simpler and more efficient.

[0090] The silent tire of the present invention fixes the sound-absorbing cotton through a large number of fixing knots 4 arranged on the inner wall of the tire. The fixing knots 4 share the pulling force of the relative movement between the sound-absorbing cotton and the inner wall of the tire in a circular matrix arrangement. The number of rows and columns of the fixing knots 4 is matched by the number of rows and columns of the sound-absorbing cotton tie bands calculated by measuring the load peak of the tire sound-absorbing cotton during acceleration and deceleration, thereby ensuring the effectiveness of the use of the sound-absorbing cotton. The fixing knot uses a double-segment knotting and winding method of an improved medical surgical knot, and uses the wire-wire fixing method of a traditional medical surgical knot for a beam-wire combination. The fixing knot 4 is a sound-absorbing cotton tie band on one side and a tire inner wall fixing hole 3 on the other side. The sound-absorbing cotton body is fixed to the inner wall of the tire through the tie band, which greatly improves the firmness of the sound-absorbing cotton tie band, and can ensure that the sound-absorbing cotton does not fall off during its life cycle. It has been verified that the fixing knot 3 of the present invention is very firm and not easy to untie, and its withstanding force value is much higher than the expected peak load generated during the movement of the sound-absorbing cotton.

[0091] In order to more clearly introduce the cable tie-containing sound-absorbing cotton, the silent tire and the assembly method of the present invention, a description is given below in conjunction with specific embodiments.

[0092] Examples 1-2 and Comparative Examples 1-2 are shown in Table 2.

[0093] Table 2 Examples 1-2 and Comparative Examples 1-2

[0094]

[0095] In Examples 1 and 2 of the present invention, the size of a single tie is 2 mm×2 mm; the density of the sound-absorbing cotton is 28 kg / m 3 The tear strength of the sound-absorbing foam is 2.5N / cm, and the tear force that a single cable tie can bear is F m '=2.5×0.2=0.5N.

[0096] In Example 1,

[0097] Sponge weight m1 = 30mm × 900mm × 110mm × 28kg / m 3 ×10 -9 =0.08316kg,

[0098] According to the surface friction coefficient, the critical value of the extreme braking acceleration is obtained, that is, the extreme working condition acceleration is 1.1G, and a1=1.1×9.8m / s 2 =10.78m / s 2 ,

[0099] The weight of the sound-absorbing foam shared by a single row of cable ties is m1' = m1 / 9 = 0.00924 kg.

[0100] The tearing force value of a single-row cable tie at instantaneous deceleration is F1'=0.00924kg×10.78m / s 2 =0.0996N,

[0101] If one tie is set per row, Calculation shows that b = 1 × 0.5 ÷ 0.0996 = 5.02.

[0102] In Example 2,

[0103] m2=30mm×1050mm×110mm×28kg / m 3 ×10 -9 =0.9702kg,

[0104] According to the surface friction coefficient, the critical value of the extreme braking acceleration is obtained, that is, the extreme working condition acceleration is 1.1G, and a2 is calculated to be 1.1×9.8m / s 2 =10.78m / s 2 ,

[0105] The weight of the sound-absorbing foam shared by a single row of cable ties is m2' = m1 / 10 = 0.009702kg.

[0106] The tearing force value of a single-row cable tie at instantaneous deceleration is F2'=0.009702kg×10.78m / s 2 =0.1046N;

[0107] If one tie is set per row, Calculation shows that b = 1 × 0.5 ÷ 0.1046 = 4.78.

[0108] According to the calculation results of Example 1 and Example 2, from the tearing force value, only one tie is needed to meet the inertia force value condition under the extreme working condition. Considering that the tire running surface is a nearly straight edge annular inner wall, and the tire has a turning condition in addition to straight running, the number of single-row tie ties in the design of the tie ties should not be less than the number of tread ribs of the passenger car tire, that is, more than 5 single-row tie ties.

[0109] Performance Testing

[0110] The performance of the silent tires obtained in Example 1-2 and Comparative Example 1-2 was tested, and the test results are shown in Table 3.

[0111] Table 3 Performance test table of silent tires of Example 1-2 and Comparative Example 1-2

[0112]

[0113] As can be seen from the above, the silent tire obtained in the embodiment of the present invention can achieve the same level of noise reduction effect as the sound-absorbing sponge installed by traditional adhesive bonding method by using a cable tie installation method, and the sound-absorbing sponge has excellent durability and sustainable use effect.

[0114] Finally, it should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only the preferred feasible embodiments of the present invention, and the above-mentioned embodiments are only used to illustrate the technical scheme of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, modifications, evolutions and improvements made by ordinary technicians in this field to the technical scheme of the present invention should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A sound-absorbing sponge containing a cable tie, characterized in that: The cable ties are arranged in a matrix on the surface of the sound-absorbing foam installation plane, and the number of cable tie columns q and the number of cable tie rows p satisfy In the formula, p represents the number of rows of sound-absorbing cotton tie tape, which is an integer; F represents the overall tensile force required under the extreme working conditions of the sound-absorbing cotton; F m It represents the maximum load at the stress position of the sound-absorbing cotton; b represents the numerical safety multiple of the sound-absorbing cotton tie; q represents the number of columns of the sound-absorbing cotton tie, and the value range of q is 8 to 10.

2. The sound-absorbing sponge with cable ties according to claim 1, characterized in that: F Satisfaction In the formula, T represents the thickness of the sound-absorbing cotton, L represents the length of the sound-absorbing cotton, W represents the width of the sound-absorbing cotton, ρ represents the density of the sound-absorbing cotton, and s represents the response time of the vehicle speed being decelerated from 100 km / h to 0 in the actual vehicle evaluation; F m Satisfy F m =TS×A / 10 3 , where TS represents tensile strength, in kPa; A represents the average original cross-sectional area of ​​the sound-absorbing cotton sample tie, in mm 2 .

3. The sound-absorbing sponge with cable ties according to claim 1, characterized in that: The sound-absorbing sponge with cable ties is obtained by partially cutting the sound-absorbing sponge in a single row and alternating left and right manner.

4. The sound-absorbing sponge with cable ties according to claim 3 is characterized in that: After cutting, the cable tie containing the cable tie sound-absorbing foam is perpendicular to the plane of the sound-absorbing foam main body, and the cross-sectional shape of the cable tie is one of square, triangle or rectangle.

5. A silent tire, characterized in that: The sound-absorbing sponge containing cable ties comprises the sound-absorbing sponge containing cable ties as described in any one of claims 1 to 4, and the sound-absorbing sponge containing cable ties is installed on the inner wall of the silent tire by means of a fixing knot.

6. The silent tire according to claim 5, characterized in that: The inner wall of the silent tire is provided with rubber fixing holes arranged in a ring matrix, and the sound-absorbing sponge containing cable ties is installed on the rubber fixing holes by means of fixing knots.

7. The method for assembling a silent tire according to claim 5, characterized in that: The following steps are involved: When preparing a semi-finished tire, a rubber sheet application step is added after the inner liner is pressed out, and a rubber sheet application step is added after the tire blank is formed to obtain the tire blank; The rubber thickness of the middle area of ​​the vulcanizing bladder with the largest inflation diameter is increased and concave cavities are arranged in an array along the circumferential direction in the thickened area, so that a tire with fixed holes on the inner wall is obtained after vulcanization; The sound-absorbing sponge with cable ties is installed to the fixing holes on the inner wall of the tire by means of two-stage fixing knots to obtain a silent tire.

8. The method for assembling a silent tire according to claim 7, characterized in that: Embryo preparation specifically includes the following steps: When preparing the semi-finished tire molding product, after the inner liner is pressed out, the film is applied to the inner liner at a fixed interval; After the conventional tire blank is formed, the film is attached to the tire at a fixed angle and compacted by a roller to obtain the tire blank.

9. The method for assembling a silent tire according to claim 7, characterized in that: The preparation of a tire with fixed holes on the inner wall specifically includes the following steps: The rubber thickness is increased in the middle area of ​​the vulcanization bladder with the largest inflation diameter, and several rows of hole cavities are arranged in an array along the circumferential direction on the surface of the thickened area, and a convex structure is arranged in each cavity to form fixed holes by vulcanization; During vulcanization, after the thickened area in the middle of the vulcanizing bladder contacts the plane of the center part of the tire embryo crown, the convex structure opens, and the rubber flows to the concave cavity for smooth vulcanization, obtaining a tire with fixed holes on the inner wall.

10. The method for assembling a silent tire according to claim 9, characterized in that: The installation of the sound-absorbing sponge with cable ties on the inner wall of the tire specifically includes the following steps: Take the end of the cable tie connected to the sound-absorbing foam body as the starting position of the fixed knot, start from the outside of the fixed hole beam, wrap around the outside of the fixed hole beam and wrap several circles, then insert the cable tie from the front end of the fixed hole beam and pass it out from the left end to get a fixed knot; One end of a fixed knot is passed through and wound upward along the front end of the fixed hole beam, and then it is wound around the rear side of the fixed hole beam for several turns and then wound out to the end point of the tie at the front end, and then it is passed through the front part of the fixed hole beam and the bottom of the front end tie to the starting end of the second fixed knot and out to obtain a two-section fixed knot, completing the assembly of the sound-absorbing cotton containing the tie and the tire with fixed holes on the inner wall to obtain a silent tire.

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