JPH02147418A - Safety tire - Google Patents

Abstract

PURPOSE:To improve flat-tire resistant performance and enable long-distance and high-speed run-flat traveling by covering and protecting the whole face of the outer periphery of a carcass with a reinforcing layer in which steel cords are used while providing a side wall reinforcing layer on the inner face. CONSTITUTION:A carcass 6 using organic fiber cords has a cross-ply structure in which the cord angles of adjacent piles are mutually crossing, while setting the total thickness of plies at above 3mm. A reinforcing layer 9 which is provided along the outward face of the carcass 6 consists of two layers of plies 9A, 9B, both of which are formed with steel cords which are arranged at a cord angle between 20 deg. and 45 deg. to the tire equator and at the same angle as the carcass cords. A side wall reinforcing layer 10 is a rubber layer having JIS-A hardness between 53 deg. and 90 deg. and an arc piece shape being formed with a thick-wall center portion 10A, a tapering outer portion 10B and a tapering inner portion 10C, and is continuously formed in a zone between the top end height H0 and bottom end height H1.

Description

[Detailed Description of the Invention] ; Industrial Application Field] The present invention greatly improves bank resistance performance and enables driving when internal pressure is reduced, and is particularly applicable to police and patrol vehicles used in armed conflicts. The present invention relates to a safety tire that can be suitably adopted for use in, etc.

[Problems to be solved by the prior art and invention] Ties for specially equipped vehicles used, for example, for escorting VIPs, transporting dangerous goods, and for police and patrol during armed conflicts such as terrorist sabotage activities and organized crime conflicts. The V is required to have excellent bank resistance and run flat properties in order to escape from the B''J, chase, etc.

Particularly in today's era when crimes are increasingly armed, there is a strong desire for new tire tires that are difficult to bank even when shot with bullets or the like, and that allow safe driving even when banked.

In particular, the present invention provides a reinforcement consisting of a steel cord,
The object of the present invention is to provide a new safety tire that can solve the above-mentioned problems based on the use of a side reinforcing layer.

[Means to solve the problem]

In order to achieve the above object, the safety tire of the present invention includes a pair of bead portions through which a bead core passes, a sidewall portion extending radially outward from each bead portion, and a tread portion connecting the sidewall portions. A plurality of organic fiber cords are used, each having a toroidal shape, passing through the tread portion and the sidewall portion, and having both ends wrapped around the bead core of the bead portion to be locked, and in which the organic fiber cords are sequentially crossed. Has plies and has a total thickness of 3mm
The above carcass and a steel cord extending from one bead part to the other bead part along the outward surface of the carcass and arranged at a cord angle of 20 degrees or more and 45 degrees or less with respect to the tire equator, and using steel cords. a reinforcing layer of at least 1 ply; a bead avex extending radially outward of the bead core between the carcass main body and a turned-up portion of the carcass; and a flange on which the bead portion is seated on the axially outer side of the bead portion. The tire cross-sectional height SH, which is the height from the inner surface of the sidewall portion and the bottom surface of the bead portion to the outermost point of the tread portion, is 0.8 to 0. The upper end height HO, which is 9 times the height, and the tire cross-sectional height SH are 0.45~
Between the lower end height Hl which is 0.55 times the height, the radially outer and inner parts of the thick central portion are tapered such that the thickness decreases radially outward and inward, respectively. In addition to continuously providing a sidewall reinforcing layer having a substantially arcuate cross section, the sidewall reinforcing layer has a maximum thickness of 5 mm or more and a rubber hardness of JISA.
53 or more and 90 degrees or less.

[Effect]

The safety tire of the present invention constructed in this way protects the carcass by covering its entire circumference with a reinforcing layer that is made of plies having steel cords and extends from one bead part to the other bead part. Even when a tire is shot by a bullet or the like, it can prevent 18 bullets from penetrating the inner skin of the tire.

Also, even if the tire penetrates and the internal pressure of the tire decreases,
The rigidity of the reinforcement layer and the sidewall reinforcement layer inside the sidewall part supports the tire load and ensures a tire deflection height that allows running, and the bead avex maintains lateral rigidity while meeting the standards for bending deformation during tire transfer. Maintains the curved shape of the sidewall.

In addition, the clinch avenue moves with the bead avenue to reinforce the bead portion, reliably transmits the load to the rim when the internal pressure decreases, and suppresses rim displacement between the rim flange and the like.

It is preferable to form a toe portion and a hump on the bead portion that fit into the annular groove and the hump groove provided in the rim, respectively, because this prevents the rim from coming off when the internal pressure decreases and improves safety.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, the safety tire l has a toroidal shape having a bead part 3 through which a bead core 2 passes, a sidewall part 4 extending radially outward from the bead part 3, and a tread part 5 joining the upper end of the sidewall part 4, In addition, a carcass 6 having a main body that passes through the tread portion 5 and the sidewall portion 4 and contacts the bead core 2 at the bead portion 3 is te, and a reinforcing layer 9 extending between the bead portions 3 and 3 is provided on the outside of the carcass 6. On the other hand, a sidewall reinforcement 7i10 is provided on the inner surface of the sidewall portion 4.

The carcass 6 has a winding part on both sides of the main body spanning between the bead cores 2 and 2, which winds around the bead core 2 from the inside of the tire to the outside.
Carcass ply 6A, 6B, 6C16D with 4 layers inside and outside
The winding ends of each of the plies 68 to 6C terminate within the bead portion 3 and the sidewall portion 4 at different heights. Naori-Power Spry 68~
6C includes carcass cords arranged at an angle of 20 to 45 degrees with respect to the tire equator, and the carcass cords include:
Organic fiber cords such as rayon, polyester, nylon, and aromatic polyamide are used. Further, the carcass 6 has a cross-ply structure in which the cord angles between adjacent plies are crossed, and the total thickness of each ply is set to 3 mm or more, thereby increasing the airtight strength of the carcass 6.

In this example, the reinforcement N9 disposed along the outward surface of the carcass 6 is composed of two layers of plies 9A and 9B, each ply 9A and 9B having a diameter of 20 mm with respect to the tire equator.
It is formed using steel cords arranged at a cord angle of at least 45 degrees and at most 45 degrees, preferably at the same angle as the carcass cord.

Further, the reinforcing layer 9 is disposed between the bead portions 3 and 3 to cover and protect the entire outer circumferential surface of the carcass 6, thereby preventing penetration by, for example, bullets, etc.
Greatly improves bank resistance performance. The plies 9A and 9B of the reinforcing layer 9 are placed one on top of the other in the same manner as the carcass 6 so that the cord angles thereof intersect with each other, thereby increasing the penetration suppressing effect by making the cord gaps dense.

Further, the sidewall reinforcing layer 10 has a thick central portion 1.
A tapered outer part 10B whose thickness decreases outward in the radial direction of 0A, and a similar inner part 10 inward.
It is a rubber layer having a JISA hardness of 53 degrees or more and 90 degrees or less, which is in the shape of a circular arc with a tire cross-sectional height S, which is the height from the bottom of the bead part 3 to the outermost point of the tread part 50.
In the area between the upper end height HO, which is 8 to 069 times the height of H, and the lower end height Hl, which is 0.45 to 0.55 times the tire cross-sectional height SR. Formed continuously.

Note that the is if region is a bending region where the tire is bent and deformed by the load received from the tread portion 5, as shown in FIG. In the area, reinforcement N9
With the carcass 6 as the neutral line, tensile strain acts on the outer side in the tire axial direction, and compressive strain acts on the inner side.

Therefore, this compressive strain is borne by the sidewall reinforcing layer 10, and the reinforcing layer N9 has the effect of suppressing bending deformation, and air venting makes it possible to run the vehicle. For this reason, while the central portion 10A, where the maximum compressive strain sometimes occurs, is made thicker, the outer portion 10B and the inner portion 10C are thickened as the compressive strain gradually decreases outward and inward in the radial direction. The thickness is tapered to reduce the deterioration of tire characteristics due to increased rubber weight.

Sidewall reinforcement [10 has a maximum thickness of 51nI
If it is less than 11, the load bearing capacity is poor, air venting impedes running stability, and increases bending deformation, which promotes compressive strain and deteriorates run-flat performance.

In addition, the sidewall reinforcement [10, as shown in FIG. By increasing the effect, thermal damage to the sidewall reinforcing layer 10 can be prevented, and long-term and relatively high-speed run-flat running is possible. Note that this protrusion 11 also serves to increase the load-bearing capacity while reducing the increase in rubber weight, and the protrusion height L is 3ffl [11 or more and 5 plates or less,
Moreover, it is preferable that the spacing pitch pt is 3 times or more and 5 times or less the protrusion height L. Note that the protrusion height L is 3
When the pitch Pt is less than mm and the pitch Pt exceeds 5 times, the heat dissipation effect is poor and the internal temperature increases. In addition, when the height of the protrusion exceeds 5 plates or when the pitch Pt is less than 3 times, the protrusion 11
The strength is poor, leading to damage such as chipping.

Further, in the safety tire 1, a bead knee (7) extending in a tapered shape radially outward from the bead core 2 is interposed between the main body portion and the rolled-up portion of the carcass 6, and a bead knee 12 is interposed between the bead portion 3 and the side wall. In addition to increasing the rigidity of the portion 4, the heel portion of the bead portion 3 is provided with a clinch avenue 13 that rises along the flange 16 of the rim 15 on which the bead portion 3 is seated.

Bead Avex 12 and Klincheve, Ri1
3 are both made of relatively high hard rubber with a JISA hardness of 74 to 95 degrees, and the bead avex 12 has a height 1 to 13 from the bottom of the bead portion 3 to the distance between the upper ends HO.
set to a range of 0.35 times or more and 0.5 times or less,
As a result, the air release helps maintain the tire lateral rigidity and deform the sidewall portion 5 below the reinforcing layer 9 while maintaining the reference curved shape during the bending deformation. In addition, the height H4 from the bottom surface of the bead portion 3 of the clinch avex 13 is 1.2 of the height H5 of the flange 16.
The rigidity of the bead part 3 is increased by working with the bead avex 12, and the air vent is set to be more than twice as much and less than 2.0 times as much as the bead part. Excellent running performance can be exhibited by reliably transmitting the above to the rim 15. Further, in this example, the clinch avenue 13 firmly holds the tip of the reinforcing layer 9, and also serves to suppress peeling of the ends of each ply 9A, 9B.

Roughly, the bead portion 3 is provided with an inward piece made of hard rubber having a substantially triangular shape and a lower end protruding radially inward from the bottom surface of the bead portion 3 at the inner end in the axial direction of the tire. The lower end portion of the toe portion 17 is located inside the bead core 2 in the tire axial direction and projects inward. Further, on the lower surface of the bead portion 3, a concave hump groove 19 is provided which is located on the outside of the toe portion 17 in the tire axial direction and continues to the toe portion 17. The bead portion 3 is fitted into an annular groove 20 provided on the rim 15 in the toe portion 17, and a hump 21 formed on the rim 15 is fitted into the hump groove 19, thereby assembling the rim 15. This prevents the rim from coming off at times, increasing safety. Note that the toe portion 17 and the hump groove 19 can be formed only in one of the bead portions 3 .

〔Effect of the invention〕

Because the safety tire of the present invention covers and protects almost the entire outer periphery of the carcass with a reinforcing layer using steel cords, in addition to being trampled by nails, metal pieces, etc., It exhibits excellent bank resistance against bullets and other targets.Also, since a sidewall reinforcement layer is attached to the inner surface of the sidewall, the load acting on the tread area is reduced even when air is released due to banks, etc. It has many effects such as being able to support the above-mentioned reinforcing layer together with the reinforcing layer, enabling long-distance and relatively high-speed run-flat running, and ensuring excellent running performance by providing dimensionally regulated bead avex and clinch avex. can be played.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view showing an enlarged bead portion, and FIG. 4 is a sectional view illustrating deformation of the tire. 2.-bead core, 3.-bead part, 4-.
- side wall part, 5-) red part, 6 - carcass, 9 - reinforcement layer, 10 - side wall reinforcement layer, 11 - protrusion, 12 - bead avex, 13 - - Clincher penx, 16--Flange, 17--Tow portion, 19--Hump groove, 20--Annular groove, 21--Hump. Patent applicant Sumitomo Rubber Industries Co., Ltd. Agent Patent attorney Naemura Seiji 251 t t 3rd

Claims (1)

[Scope of Claims] 1. A toroidal shape comprising a pair of bead portions through which a bead core passes, a sidewall portion extending radially outward from each bead portion, and a tread portion connecting the sidewall portions, and It uses an organic fiber cord that passes through the tread portion and the sidewall portion and is secured by winding both ends around the bead core of the bead portion, and has a plurality of plies in which the organic fiber cords are sequentially crossed, and has a total thickness. A carcass with a diameter of 3 mm or more, and a steel cord extending along the outward surface of the carcass from one bead part to the other bead part and arranged at a cord angle of 20 degrees or more and 45 degrees or less with respect to the tire equator. a bead avenue extending radially outward of the bead core between the carcass main body and a rolled-up portion of the carcass; and the bead portion is seated on the outer side of the bead portion in the tire axial direction. and a clinch avenue rising along the flange, and the tire cross-sectional height SH, which is the height from the inner surface of the sidewall portion and the bottom surface of the bead portion to the outermost point of the tread portion, is 0.8 to 0.8. The upper end height HO which is 0.9 times the height and 0.9 times the tire cross-sectional height SH.
Between the lower end height H1 which is 45 to 0.55 times the height,
The radially outer and inner parts of the thick center part are tapered so that the thickness decreases radially outward and inward, respectively, so that the sidewall reinforcement layer, which has a substantially arcuate cross-section, is continuous. A safety tire in which the sidewall reinforcing layer has a maximum thickness of 5 mm or more and a rubber hardness of JISA 53 or more and 90 degrees or less. 2 The height H3 from the bottom of the bead part of the bead avenue is 0.35 times or more the upper end height HO and 0.5
In addition, the height H4 from the bottom of the bead of the clinch avenue is 1.2 times the height H5 of the flange.
2. The safety tire according to claim 1, wherein the safety tire is at least twice as long and not more than 2.0 times. 3. The sidewall reinforcing layer has, on its inner surface, protrusions extending in the tire radial direction and spaced apart in the circumferential direction, and the height of the protrusions is 3 mm or more and 5 mm or less, and 3. The safety tire according to claim 1, wherein the pitch Pt is 3 times or more and 5 times or less the height of the ridge. 4. The bead portion is seated on the rim, and at least one of the bead portions includes a toe portion located inside the bead core in the tire axial direction and extending radially inward, and a toe portion located outside the toe portion in the tire axial direction. The safety device according to claim 1, 2 or 3, wherein the rim includes a concave hump groove, and the rim includes an annular groove into which the toe portion is fitted and a hump which fits into the hump groove. tire.