WO2009113583A1 - Pneu à carcasse radiale pour véhicule et son procédé de fabrication - Google Patents

Pneu à carcasse radiale pour véhicule et son procédé de fabrication Download PDF

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Publication number
WO2009113583A1
WO2009113583A1 PCT/JP2009/054679 JP2009054679W WO2009113583A1 WO 2009113583 A1 WO2009113583 A1 WO 2009113583A1 JP 2009054679 W JP2009054679 W JP 2009054679W WO 2009113583 A1 WO2009113583 A1 WO 2009113583A1
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WO
WIPO (PCT)
Prior art keywords
tire
organic fiber
belt
reinforcing layer
fiber cord
Prior art date
Application number
PCT/JP2009/054679
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English (en)
Japanese (ja)
Inventor
武 穂高
哲也 溝根
孝行 山本
Original Assignee
本田技研工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Publication of WO2009113583A1 publication Critical patent/WO2009113583A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/30—Applying the layers; Guiding or stretching the layers during application
    • B29D30/3028—Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the drum axis, to form an annular element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
    • B60C9/2204—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre obtained by circumferentially narrow strip winding

Definitions

  • the present invention relates to a radial tire for a vehicle and a manufacturing method thereof.
  • Recent automobiles tend to be equipped with radial tires excellent in handling stability and durability at high speeds.
  • this radial tire two belt layers in which belt cords are inclined in opposite directions with respect to the tire circumferential direction are laminated, and this is disposed outside the carcass layer of the tread portion.
  • the laminated belt layer has rigidity in the circumferential direction and the width direction, and the carcass layer is tightened by the effect to maintain the tire shape.
  • a reinforcing layer is provided outside the belt layer, the rigidity of the tread portion is improved and the high-speed durability is further improved.
  • Non-Patent Document 1 “Basics and Practice of Automobile Tires” (page 15), edited by Bridgestone Co., Ltd. Sankaido
  • the band material 101 is wound around the circumferential surface of the tire frame 100 from one end to the other end.
  • organic fiber cords with high elongation for example, nylon
  • the tightening imbalance in the vulcanization process is hardly corrected, and therefore the rubber flow is uneven in the vulcanization process.
  • conicity is deteriorated due to a decrease in uniformity accuracy.
  • an object of the present invention is to provide a radial tire for a vehicle and a method of manufacturing the same, in which the conicity is not deteriorated even when an organic fiber cord of a reinforcing layer has a low elongation.
  • the present invention provides a radial tire for a vehicle in which an organic fiber cord is spirally wound in a tire circumferential direction around a belt layer to form a reinforcing layer, and the reinforcing layer includes two organic fiber cords. Is formed by being advanced from both ends in the tire width direction toward the center. Alternatively, the reinforcing layer is formed by winding two organic fiber cords from the center in the tire width direction toward both ends.
  • the present invention for solving the above-described problems is directed to a method for manufacturing a radial tire for a vehicle in which an organic fiber cord is spirally wound around a belt layer in a tire circumferential direction to form a reinforcing layer.
  • the two band members are used, and when forming the reinforcing layer, these band members are rolled from the both ends in the tire width direction toward the center.
  • these strips are wound from the center in the tire width direction toward both ends.
  • the distribution of the tightening force by the organic fiber cord is substantially symmetric with respect to the tire equatorial plane, so that uniformity accuracy is ensured and deterioration of conicity is prevented.
  • the distribution of the tightening force by the organic fiber cord is substantially symmetrical with respect to the tire equatorial plane, uniformity accuracy is ensured even when the organic fiber cord of the reinforcing layer has a low elongation. Thus, deterioration of conicity can be prevented. Furthermore, since the organic fiber cord is discontinuous at the center of the tread portion where the input load from the road surface is small, there is almost no discoloration in strength compared to the reinforcing layer in which the organic fiber cord is continuous.
  • FIG. 3 is a development view of a belt layer and a reinforcing layer in the radial tire.
  • FIG. 4 is a diagram for explaining a cord arrangement of a belt layer and a reinforcing layer in the radial tire.
  • FIG. 4 is a graph showing the relationship between the belt cord inclination angle and the Young's modulus in a laminated belt. It is a perspective view which shows the winding method of an organic fiber cord. It is a perspective view which shows the other winding method of an organic fiber cord. It is a perspective view of the strip
  • FIG. 1 is a schematic diagram showing a cross-sectional structure of a radial tire for a vehicle according to the present invention
  • FIG. 2 is a development view of a belt layer and a reinforcing layer in the radial tire
  • FIG. 3 is a diagram for explaining a cord arrangement of the belt layer and the reinforcing layer.
  • FIG. 4 is a graph showing the relationship between the belt cord inclination angle and the Young's modulus in the laminated belt.
  • This vehicular radial tire (hereinafter abbreviated as “radial tire”) 1 includes a tread portion 2 in contact with the ground, shoulder portions 3 provided at both ends of the tread portion 2, and sidewall portions 4 extending from the shoulder portion 3.
  • a bead portion 5 provided at the tip of the sidewall portion 4 to be fitted to the rim R is provided, and an air chamber 16 having a substantially crown-shaped cross section is formed by these portions 2, 3, 4, and 5.
  • a bead core 6 and a bead filler 7 are built in the bead portion 5.
  • the radial tire 1 includes a carcass layer 8 in which both ends are folded and coupled with a pair of bead cores 2 and bead fillers 3, two belt layers 9 and 10 disposed outside the carcass layer 8 of the tread portion 2, and the belt layers 9. , 10 and a reinforcing layer 11 made of organic fibers disposed on the outside.
  • the carcass layer 8 is a rubberized cord layer forming a skeleton as a tire, and carcass cords 8a made of organic fibers such as nylon, polyester, and aromatic polyamide are arranged in a radial direction orthogonal to the tire circumferential direction (see FIG. 2).
  • the belt layers 9 and 10 are rubberized cord layers having non-stretchable cords, and the carcass layer 8 is tightened by the effect to keep the tire shape.
  • the belt layers 9 and 10 are formed in a belt shape by bias-cutting a rubberized cord to form a band material and connecting both ends thereof. For this reason, belt cords 9a and 10a inclined with respect to the width direction of the belt layers 9 and 10 are embedded in the rubber layers 9b and 10b at a predetermined pitch (see FIG. 3).
  • a stranded wire of steel or organic fiber (such as aromatic polyamide) is used for the belt cords 9a and 10a.
  • the belt layers 9 and 10 are laminated by inclining the belt cords 9 a and 10 a in opposite directions with respect to the tire circumferential direction. Further, the inclination angles ⁇ 1 and ⁇ 2 of the belt cords 9a and 10a with respect to the tire circumferential direction are made equal, and the values thereof are set to 45 to 65 degrees. The inclination angles ⁇ 1 and ⁇ 2 of the belt cords 9a and 10a with respect to the tire circumferential direction are preferably closer to a singular angle of 54.7 degrees.
  • the belt layers 9 and 10 are formed by bias-cutting rubberized cords at the same angle, the belt cords 9a and 10a are aligned with respect to the tire circumferential direction by laminating both ends in the width direction in parallel. They are arranged symmetrically and the inclination angles ⁇ 1, ⁇ 2 are equal.
  • the inner belt layer 9 is formed wider than the outer belt layer 10, and both ends of both belt layers 9 and 10 reach the shoulder portion 3 beyond the tread portion 2.
  • the reinforcing layer 11 is formed by spirally winding an organic fiber cord 11 a around the belt layers 9 and 10 in the tire circumferential direction.
  • the organic fiber cord 11a is preferably wound in a single layer aligned in the tire width direction, but may be wound in multiple layers depending on the characteristics of the radial tire.
  • the organic fiber cord 11a uses a strand of an organic fiber such as an aromatic polyamide fiber, a polyarylate fiber, or a polyparaphenylene benzbisoxazole fiber.
  • the reinforcing layer 11 is formed wider than the inner belt layer 9 so as to completely cover the belt layers 9 and 10 (see FIG.
  • the rigidity in the circumferential direction of the belt layers 9, 10 is greatly reduced. For this reason, the difference of the tensile force with respect to the width direction of the belt layers 9 and 10 hardly arises, and the price tear by tire twist is reduced significantly. For this reason, the rolling resistance is reduced and the straight traveling performance is improved.
  • the reinforcing layer 11 is provided on the outer side of the belt layers 9 and 10 so that the circumferential rigidity of the belt layers 9 and 10 is increased. To compensate for the decline.
  • the reinforcing layer 11 is formed by spirally winding the organic fiber cord 11a around the belt layers 9 and 10 in the circumferential direction of the tire, the outer side of the belt layers 9 and 10 in the radial direction due to centrifugal force during high-speed rotation. This prevents the belt layers 9 and 10 from being distorted. For this reason, peeling of the belt layers 9 and 10 becomes difficult to occur, and the high-speed durability is greatly improved. Further, since the belt layers 9 and 10 are reinforced by the organic fiber reinforcing layer 11, the tire rigidity is maintained at an appropriate level as compared with the case where the tire rigidity is ensured only by the belt layer, and the riding comfort characteristics are improved. There will be no decline.
  • FIG. 5 is a perspective view showing a method of winding an organic fiber cord
  • FIG. 6 is a perspective view showing another method of winding the organic fiber cord
  • FIG. 7 is a perspective view of a band material incorporating the organic fiber cord
  • FIG. It is a graph which shows the elongation of an organic fiber cord.
  • the inclination angle ⁇ 1 and ⁇ 2 of the belt cords 9a and 10a is set to 45 to 65 degrees so as to reduce the price tear, while the decrease in the circumferential rigidity of the belt layers 9 and 10 is caused by the organic fiber reinforcing layer. 11 is supplemented.
  • an aromatic polyamide fiber having a high elastic modulus or the like is used as the organic fiber cord 11a.
  • this type of fiber has a property that it is difficult to stretch as compared with a conventionally used nylon fiber or hybrid fiber (a composite fiber of nylon and aromatic polyamide).
  • a conventionally used nylon fiber or hybrid fiber a composite fiber of nylon and aromatic polyamide.
  • FIG. 5 a method of using two strips 12 including the organic fiber cord 11a and winding these strips 12 and 12 around the circumferential surface 13a of the tire frame 13 from both ends in the width direction toward the center.
  • FIG. 6 a method is adopted in which the two strips 12, 12 are wound around the circumferential surface 13a of the tire frame 13 from the center in the width direction toward both ends.
  • the band member 12 is wound while the end edges are in contact with each other without forming an overlap margin, and is in contact with the end edges of both the band members 12 and 12 at the tire equator.
  • the tire skeleton 13 refers to a structure in which the carcass layer 8 and the belt layers 9 and 10 are inflated and held by a bladder in a green tire molding process. Then, the strips 12 and 12 are wound around the tire skeleton 13 as described above, and the parts constituting the tread portion 2 and the sidewall portion 4 are assembled thereto to form a green tire, and the green tire is then subjected to a vulcanization process. Is heated and pressurized, and each part is integrated into a final product.
  • the band 12 is obtained by cutting a rubberized cord into a band shape along the cord, and a plurality of organic fiber cords 11a are embedded in the rubber layer 12a (see FIG. 7). *
  • the tightening tends to become tight as the winding of the strip 12 proceeds. Further, since the elongation of the organic fiber cord 11a is low, the tightening imbalance in the vulcanization process is hardly corrected. For this reason, when the winding method of FIG. 5 is adopted, the tightening force of the organic fiber cord 11a is minimized at both ends of the tire width and increases toward the inside. On the other hand, when the winding method of FIG. 6 is adopted, the tightening force of the organic fiber cord 11a is minimized at the center of the tire width and increases toward the outside. However, in any of the methods, the distribution of the tightening force by the organic fiber cord 11a is substantially symmetrical with respect to the tire equator plane, so that uniformity accuracy can be ensured and deterioration of the conicity can be prevented.
  • the organic fiber cord 11a is discontinuous at the center of the tread portion 2, but most of the input load from the road surface acts on the shoulder portion 3, and the tread portion. Since it does not act so much in the center of 2, compared with the case where the organic fiber cord is continuous, there is almost no fading on strength.
  • the tire is described in which the inclination angles ⁇ 1, ⁇ 2 of the belt cords 9a, 10a are set to 45 to 65 degrees.
  • the winding method of the organic fiber cord according to the present invention sets the inclination angle of the belt cord.
  • the present invention can also be applied to a general tire set to 17 to 27 degrees.
  • Example> The radial tire of the example was produced by the following method.
  • a strip 12 is produced using a twisted strand of an aromatic polyamide fiber as the organic fiber cord 11a, and this is wound around the tire frame 13 by two methods shown in FIGS. 5 and 6 to produce one reinforcing layer 11 each. did.
  • a radial tire produced by the method of FIG. 5 (a method of winding the strip 12 from both ends to the center) is set as Example 1, and a radial tire produced by the method of FIG. 6 (a method of winding the strip 12 from the center to both ends) is implemented.
  • Example 2 The produced tire has a tire size of 195 / 65R15, a rim size of 15 ⁇ 6 J, and an air pressure of 220 kPa.
  • a radial tire of a comparative example was produced by the following method.
  • the two types of strips 12 using the strands of nylon fibers as the organic fiber cord 11a and the strands of strands of aromatic polyamide fibers are produced, and the strips 12 are shown in FIG.
  • one reinforcing layer 11 was produced by wrapping around the tire frame 13.
  • a tire produced by the method of FIG. 9 (a method of winding the strip 12 in one direction) using the strip 12 containing nylon fibers is referred to as a radial tire of Comparative Example 1. Further, a tire produced by the method of FIG.
  • a method of winding the strip 12 in one direction using the strip 12 containing the aromatic polyamide fiber is referred to as a radial tire of Comparative Example 2.
  • the size and air pressure of the manufactured radial tire are the same as the radial tire of an Example.
  • Durability test The vehicle was run under conditions of a speed of 80 km / h, a load of 8 kN, and an air pressure of 150 kPa, and the distance to the place where the radial tire was damaged was measured.
  • the test result of other radial tires tested including the examples is converted into an index with the test result of the radial tire of Comparative Example 1 being 100, and the larger this index is, the better the durability performance is.
  • RFV / LFV / conicity Measured using a uniformity machine under conditions of an air pressure of 220 kPa and a load of 450 kg.
  • the test result of other radial tires tested including the examples is converted into an index with the test result of the radial tire of Comparative Example 1 as 100, and the larger the index, the better each evaluation. Table 1 shows the results of the comparative test.
  • the radial tire of Comparative Example 2 using the method of winding the strip 12 containing the aromatic polyamide fiber in one direction uses the method of winding the strip 12 containing the nylon fiber in one direction.
  • the conicity is extremely low. This is thought to be because aromatic polyamide fibers have low elongation and uniformity uniformity is reduced due to imbalance in tightening.
  • the conicity was greatly improved and improved to the same level as before. It was done. Some improvement was also observed for RFV and LFV.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

L'invention porte sur un pneu à carcasse radiale pour un véhicule (1) dans lequel une couche de renfort (11), produite par l'enroulement d'un câble de fibre organique en une forme hélicoïdale dans la direction périphérique du pneu, est formée dans une couche de ceinture (10). Le procédé de fabrication de la couche de renfort (11) comporte soit l'enroulement de deux rubans (12) contenant un câble de fibre organique autour de la surface périphérique (13a) de la carcasse de pneu (13) à partir des deux extrémités dans la direction de la largeur vers le centre, soit l'enroulement de deux rubans (12) autour de la surface périphérique (13a) de la carcasse de pneu (13) à partir du centre dans la direction de la largeur vers les deux extrémités.
PCT/JP2009/054679 2008-03-12 2009-03-11 Pneu à carcasse radiale pour véhicule et son procédé de fabrication WO2009113583A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-062126 2008-03-12
JP2008062126 2008-03-12

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WO2009113583A1 true WO2009113583A1 (fr) 2009-09-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011140169A (ja) * 2010-01-07 2011-07-21 Sumitomo Rubber Ind Ltd 自動二輪車用タイヤの製造方法
EP2551096A1 (fr) * 2011-07-28 2013-01-30 Sumitomo Rubber Industries Limited Procédé de production de pneu
CN105620203A (zh) * 2014-11-26 2016-06-01 住友橡胶工业株式会社 充气轮胎及其制造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08142226A (ja) * 1994-11-15 1996-06-04 Sumitomo Rubber Ind Ltd 空気入りタイヤの製造方法
JPH08175104A (ja) * 1994-08-23 1996-07-09 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2006137020A (ja) * 2004-11-10 2006-06-01 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤの製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08175104A (ja) * 1994-08-23 1996-07-09 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JPH08142226A (ja) * 1994-11-15 1996-06-04 Sumitomo Rubber Ind Ltd 空気入りタイヤの製造方法
JP2006137020A (ja) * 2004-11-10 2006-06-01 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤの製造方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011140169A (ja) * 2010-01-07 2011-07-21 Sumitomo Rubber Ind Ltd 自動二輪車用タイヤの製造方法
EP2551096A1 (fr) * 2011-07-28 2013-01-30 Sumitomo Rubber Industries Limited Procédé de production de pneu
CN105620203A (zh) * 2014-11-26 2016-06-01 住友橡胶工业株式会社 充气轮胎及其制造方法
CN105620203B (zh) * 2014-11-26 2019-03-01 住友橡胶工业株式会社 充气轮胎及其制造方法

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