JPS5967108A - Radial tire for heavy vehicle - Google Patents

Abstract

PURPOSE:To effectively prevent separation between plies while maintaining the rigidity of the layers of belts by constructing said layers of belts, which are embedded between the tread and the carcass, with four plies, in each of which steel cords and organic fiber cords are arranged with particular angles respectively. CONSTITUTION:A tread 4 is provided on the crown B of the radial ply carcass 2 of a radial tire, and layers of belts 9 are provided between the tread 4 and the carcass 2. The layers of the belts 9 consist of the first to the fourth plies 5 to 8, and the first, third and fourth plies 5, 7 and 8 are constructed with steel cords arranged in the peripheral direction of the tire at angles of 50 deg. to 70 deg., -10 deg. to -30 deg., and -10 deg. to -30 deg., respectively while the second ply 6 is constructed with organic fiber cords arranged in the peripherial direction of the tire at an angle of 0 deg. to 50 deg.. The both ends of the second ply 6 are axially folded inward in such a way that it covers the both ends of the third ply 7, increasing the effect for preventing separation between the plies.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a radial tire for heavy vehicles, a radial tire for two-way use with a patented flat, rectangular or triangular structure.

Generally, the structure of a radial tire for heavy vehicles is shown in Figure 1a.
U <, one or more toroidal carcass plies (2) with both ends folded around the bead core (1) are oriented in the radial or semi-radial direction.
In addition to reinforcing the bead 1 part with bead filler (filter), the crown part FB+ has a tread (4).
The belt layer (9) is formed by overlapping four plies (51 (6t) (71 (8)) in the circumferential direction on the underside of the L/Red (4) made of steel cord. The belt layer (9) has two types of configurations as shown in Table 1.The structure of the belt layer (9) is shown in Figure 2. In this way, the first ply (510 angle) is increased, the in-plane bending rigidity of the belt layer is increased, and the second ply (6) and the second ply (c) are made to intersect with each other in the circumferential direction of the belt layer. Even if the rigidity is increased, σ is the same as that of the so-called triangular structure.In such a structure, the second ply (6) and the fifth ply (
7) is caused by crossing at a large angle, and shearing occurs before and after applying internal pressure or load to the tire. In other words, as shown in Fig.
1 and the 51st lie (7) move in the opposite direction to the code μ steel 1 (11), causing an elastic strain at the shear angle (θ).As a result, the second ply ( 6
) and the fifth ply (C), especially both ends (6a) (
7a+ # Coupled with the difference in rigidity at that part, separation between the briars occurs. Therefore, the inventor conducted repeated research to reduce the shear strain between the second ply and the second ply while maintaining the in-plane bending rigidity, which is a characteristic feature of the conventional Triangle i Samurai 1, and found that organic fibers were added to the second ply. By using a cord layer and integrally covering both ends of the second filter ply with this organic fiber cord layer, the shear force between both plies is reduced.
It has been found that this can be alleviated, leading to the present invention. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to effectively prevent separation between plies while maintaining the rigidity of a belt layer of a radial tire for vehicles having a so-called triangular belt layer.

The present invention provides a radial tire e having a tread section in the crown section of a radial ply carcass and a belt layer disposed between the tread section and the tread section and the carcass. Shiko 5
A first ply placed adjacent to the carcass and an organic fiber cord are connected at an angle of 0° to 70″ in the tire circumferential direction.
At an angle of 0 to 50'', the 21st lie adjacent to the F side of the first ply and the steel cord are connected in the circumferential direction of the tire at an angle of 10I to 10U. Adjacent to Ply's E1 rule 'iii I 5].

Lie and steel coat 1° in the tire circumferential direction (this -10°
The 41st lie is arranged adjacent to the J: side of the 61st lie at an angle of ~-'501, and both ends of the second ply cover both ends of the lower ply. This radial tire for heavy vehicles is characterized by being folded back inward in the axial direction so as to Hereinafter, one embodiment of the F-tree invention will be explained to two punishments according to the drawings. Figure 4 p.
FIG. 5 shows a schematic plan view of Hajime Kogi's belt layer. In the figure, the Belt Symphony Orchestra (10) consists of four blies, from the desk 1st ply to the 41st lie.
11, the sixth ply (13) and the fourth ply (14) are both made of steel cord, and the second ply (12)
) is composed of organic V&fibre cords.

Here, the cord angle of the first ply (11) is arranged at an angle of 50' to 70 degrees with respect to the tire circumferential direction, and carcass plies with cord angles close to this are arranged as 1-i and 1l.
This is to reduce the ply distortion between the two by reducing the two-to-1-' angle of tl, and to increase the in-plane bending rigidity of the belt layer by forming a triangular groove with the curved ply.

Next, the second ply (12) is made of aromatic polyamide fiber, nylon MA, polyester fiber III, rayon i! Although R and the like can be used, aromatic polyamide fibers are particularly suitable. This is because the second ply (12) is integrated with the fifth ply (1st layer) and also forms a tryon structure with the 11th ply (11), so it is preferable to use a rigidity close to that of other ply beaten steel cord plies. It depends. Here, the aromatic polyamide fiber cord is strong +15j 15
g/d = first pharynx modulus 17 Q kl/d = F
It is preferable to use such a material because it has a high reinforcing effect and improves handling stability.

In addition, for aromatic polyamide JMt, the twist number (NT) shown by the following formula of the code is 0 and 20-
The range is 0.55, particularly preferably 050 to 0.4
2), the twist is in the range of 120 to 180 of the F ratio.

NT-+p×E〒1〒1〒4D If it exceeds 055, the strength and modulus will be low, and the ply will become curled, which will affect the molding workability.

On the other hand, if it is less than 0.20, it is not preferable because the cohesiveness and fatigue resistance are impaired. Addendum to the song: The embedded rubber in the multi-fiber cord layer is a rubber that has a modulus comparable to or slightly smaller than that of the embedded rubber in the adjacent steel cord layer, for example, the 3LIO explosive modulus is in the range of 1213 to 230/t4. be. When aromatic polyamide fiber M1/1'' is used at one time, α is 180 to 230 A·l/'d ilM.
By using a material with a modulus similar to that of the steel cord reinforcing layer in the surrounding area, a reinforcing effect can be obtained. If the modulus is 120 Lv/rJ Il, F, the effect of the arrangement of the headed 4J and one layer of fibers, ie, the prevention of ply delamination, is not effective by 4 minutes.

Next tr B< 21 rai (121C1) lfA (W
2 ] is 100 to 12 of the width (mu) of the 6th derai (15)
It is set to a range of 0. If 1204 is repeated here, a new starting point of stress concentration occurs at the end t of the second ply.

Also, fold back 'LIg (#51 considers the ease of folding work! L Te singing' 2 Fly width (w2.,) l
/) 34-404 IT or the range of 8%-15th section.

Next, i'+r, the 3rd ply (13) is the 11th lie (
(Wl) of the second ply (11), and the cord angle is wider than (Wl) of the second ply (12). It intersects with an inclination in the opposite direction, but its itJ degree is -10' to - in the tire circumferential direction.
It is 6°O. Note that the angle of the spit is inclined in the opposite direction to the Shima 2 Bligh code.

Further, the fourth ply (14) is arranged so as to have an overlapping part between the folded part (12al) of the second ply (12al) and the side t. The movement of the folded part (12al) is suppressed, and it is possible to prevent the brake peeling at the relevant RTM slope.
is adjacent to the folded portion (12al) and the difference in rigidity is alleviated, so that it is possible to effectively balance the stress concentration at the end portion N4al'cX.
) is aligned in the same direction as the folded portion (12al) of the second ply and at approximately the same cord angle, so the shear strain between them is greatly reduced.

FIG. 6 shows another embodiment of the invention. Here, the third ply is divided at a part of the center into two pieces.

Lie (consisting of 151 (16+).By bending, the circumferential rigidity of a part of the crown center is weakened and the cross of the outer periphery is increased w1., while suppressing the change in the outer diameter of a part of the shoulder. The ply spacing (W6) of the second ply is effective in reducing the shear strain between the second plies.
It is in the range of 0.

Also, in Figure 4, the 41st lie (14) is the 2nd ply (12
) The folded part of the second ply (17 is shown adjacent to the L side of i2al, but the folded part of the second ply 1ilj
(ln a) and 11il on the J- side of the 5th ply! You can also adopt a single bacterial composition that is placed as a concubine and placed 4-J
−i1 νL+ (invention P steel radial tie A
1 belt layer Especially the second ply with the triangle structure is organic! Since both ends of the third ply are integrated with the organic fiber cord layer, the shear strain between them can be effectively suppressed, and the Velsit fastening, which is an original feature of the triangular structure, is achieved. Example tire size 10.00 R2014P R steel radial car casco ~ 1" width 1 for plain tires
Prototype tires were manufactured with various specifications shown in the table and performance evaluations i, +li
The results of vomiting are shown in the same table. In addition, trial r [tire 15
It is as shown in Fig. 1 except for this grooved belt.

Damage to the electrical equipment at the end of the belt layer is as follows: drum diameter: 1593, tire internal pressure: 8.0 &uf/C+I, load: 4000 f
, the belt was run under dry conditions at a speed of 50 & line/h Table 1/4E11 1st ply, 4th ply, and 2nd ply in the case of partial bite.
TOKA (I Significant improvement was observed over time,

[Brief explanation of drawings]

Fig. 1 is a sectional view of the tire, Fig. 2 is an enlarged front view of its belt layer, Fig. 3 is a partial sectional view of the belt layer, Fig. 4 is a schematic side view of the belt layer of the present invention, and Fig. 5 is its front view. A schematic plan view, FIG. 6 is a front view of the loop of the belt layer of the embodiment of the music of the present invention, Patent applicant: Yoshihira Nakamura, agent, patent attorney, Sumitomo Rubber Industries, Ltd. FIG. 1, 3 and 2 Diagram ■, Indication of the case Patent Application No. 177258, filed in 1982, 2, Title of the invention: Radial tires for heavy vehicles 3, Person making the amendment Relationship to the case Patent applicant address: 1-1-1 Tsutsui-cho, Chuo-ku, Kobe City 5. Target person for correction (3) Ir't Figure 2 as shown in the attached sheet. Figure 2

Claims (1)

[Scope of Claims] (11) In a radial tire having a tread part in the crown part of the radial ply carcass and a bell seat seat installed between the core tread part and the carcass, t7) the retro layer is made of a steel cord in the circumferential direction t of the tire. At an angle of 506 to 7 degrees, the first ply placed adjacent to the carcass and the organic fiber cord are arranged at an angle of 0 degrees to 50 degrees in the tire circumferential direction.
At an angle of -
J:, 1 of the second ply at an angle of 10' to -30°
A 2r33 ply placed in the front adjacent to the 2r33 ply, and a 41st light installed adjacent to the L side of the third ply with the steel cord at an angle of 10° to -60° in the circumferential direction of the tire. and both ends of the second ply are axially inward +3
A radial tire for heavy vehicles characterized by a 111 folded back. (2) The second ply, Minetai J Wei Ko P, is a special 1. ．． i! A radial tire for the 11th article. The radial tire according to claim 1, characterized in that the ply width (Wl) of the ply of +l@1 ply is smaller than the ply 1114 (+V21) of the second ply. (4) The ply width (Wl) of the ply of the second ply The cord angle is an angle in the circumferential direction (*1 and 10°~self D0 Claims: y+<
Radial tires listed in 1Q. (5+ The radial tire according to claim 1, wherein the third gly is a single ply or a two-part ply.