JPS5930564B2 - Safety structure for pneumatic tire wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of a safety structure built into a tire to support a vehicle in place of the air pressure within the tire when the tire is punctured, and in particular to the improvement of a safety structure that is incorporated into a tire to support a vehicle in the event of a tire puncture. No special structure and no special structure to notify the occupants reliably and quickly,
This not only allows for safe driving, but also significantly improves durability when driving due to punctures.

Generally speaking, what is called a safe tire is durable even in the event of a puncture, whereas regular tires can hardly be driven if they lose air due to a puncture or other reasons.

It is well known that significant improvements have been made to maneuverability, stability, and ride comfort, but on the other hand, there is a problem in that it is difficult to easily detect air loss due to flat tires, etc. The reality is that safe tires have the potential to become extremely dangerous.

Furthermore, some of the conventional safety structures built into tires have protrusions that protrude outward on their outer peripheral surfaces, but this has the problem of significantly reducing durability in the event of a puncture. .

In view of these problems, the present invention reliably detects tire punctures and the like through the vibration sound of the wheels, immediately alerts the driver, and aims to save human life, prevent accidents, and ensure safe driving. It is an object of the present invention to provide a safety structure with significantly improved durability in the event of a flat tire, and therefore a feature of the present invention is to provide a pair of opposing annular side walls for engaging the inner surface of the bead of a pneumatic tire. In the safety structure, the outer circumferential circular surface of the annular top has a part cut out in the circumferential direction substantially parallel to the tire axis and is damaged. A protrusion is formed on the circumferential side of the defective surface to protrude radially outward from the outer circular surface of the annular top.

The present invention will be explained below with reference to the illustrated embodiments.

In FIG. 1, 1 is a pneumatic tire, 2 is an outboard rim, 3 is an inboard rim, 4 is a safety structure according to the present invention, 5 is a bead portion holding member, and the pneumatic tire 1 extends in an annular shape. It consists of a pair of annularly extending shoulders 1, 1 which are spaced apart laterally from the top 6, opposing side walls 8, 8, and a bead 10, 10 having a bead 9°9 therein. , together with the tire inner surface 11 form an annular enclosure.

The bead portion 10.10 has a retaining surface 12.12 formed on its outer wall for engaging the rims 2, 3, and an inner surface 13 of the bead portion that engages with the safety structure 4 on its inner wall. .13 are provided respectively.

Further, the outboard rim 2 has a 7272 part 1 extending annularly.
5, a bead engaging wall 17 that engages with the rim retaining surface 12 of the bead section 10, and a rim seat surface section 19 that also supports the base surface 14 of the bead section 100, and the rim seat surface section 1
9 extends radially inward to form a fixing flange portion 33, and the inboard rim 3 has a flange portion 1 extending annularly.
6, a bead engaging wall 18 that engages with the rim engaging surface 12 of the bead portion 10, a rim seat portion 20 that also takes charge of the base surface 14 of the bead portion 100, and a terminal end of the bead portion 10 of the rim seat portion 20. It extends further axially inwardly at an angle of substantially 0 degrees with the axial direction, and contacts at the fixing flange portion 30 of the outboard rim 2 and radially inwardly extends. The tire has a structure in which seven fixing flange portions are formed which extend to the inner surface of the tire and include a sealing portion 32 in which a sealing material 31 can be housed, thereby sealing the air inside the tire.

The safety structure 4 of the present invention is built into the space surrounded by the pneumatic tire 1 and the rims 2 and 3, and this safety structure 4 is an integral annular body like the pneumatic tire 1. The top portion 22 of the shoulder portion 2L2L and a pair of side wall portions 23 that are spaced apart laterally and extend annularly.
．． 23, and has a gate-shaped or saddle-shaped cross-section as a whole as shown in the figure, and furthermore, a projection 28 is formed on a portion of the top portion 220 in the circumferential direction.

That is, on the outer peripheral surface of the annular top portion 22, as shown in FIG. 1, a defective surface 2T cut out approximately parallel to the tire axis extends the outer peripheral circular surface 4A of the top portion 22 to a depth D as shown in FIG. On the circumferential direction (arrow direction in FIG. 5) side of the defective surface 270, in this example, on both sides in the circumferential direction, there are protrusions 28 having a height indicated by the symbol H from the outer circumferential circular surface 4A. The projection 28 extends in the axial direction of the tire as shown in FIG.

24.24 is on this safety structure 4, and the bead part outer surface formed corresponding to the tire bead part inner surface 13, 13, 25.25 is also on the safety structure 40 base wall,
The base portion is provided corresponding to the rim seat portions 19, 20, and is adapted to fit the rim seat portions 19, 20 or has a tightening allowance.

Also, the shoulder portions 21, 21 or the side wall portions 23, 2 of the safety structure 4
It is preferable that non-extensible members 26, 26 are embedded inside the member 3 as shown in the figure.

By incorporating the bead portion holding member 5, which is an elastic annular body that contacts and supports the base portion 25.25 of the safety structure 40, when the tire loses air, the tire bead and the base of the safety structure are removed from the rim seat. The load bearing capacity of the safety structure 4 is improved by preventing the parts from moving inward in the axial direction.

The tire 1 is thus filled with air through an air pulp (not shown), the air first entering the enclosed space 34 by the safety structure 4.

At this time, the safety structure 4 is provided with air circulation holes 29 at appropriate locations on its top 22 and/or side walls 23, 23, so that the air that has entered the space 34 will flow through the safety structure 4. It reaches into the enclosed space 35 of the pneumatic tire 1 through the circulation hole 29 in the pneumatic tire 1, and the inflated state as shown in FIG. 1 is ensured.

The safety structure 4 has its shoulders 21, 21 or top 22 separated from the tire inner surface 11 by the filled air in the pneumatic tire inflated state, and when the air in the tire is released, the first As shown by the chain line in the figure, the tire inner surface 11 is flattened so as to be in contact with the shoulder 21.degree. 21 or the top 22.

In this case of deflation, the shoulder 21 of the safety structure 4
, 21 and the side wall portions 23.23 cooperate with each other to support the weight of the vehicle, and the load is transferred to the outer surface 24 of the bead portion.
．． 24 and the base 25.25 to the rims 2, 3.

FIG. 2 shows an embodiment in which the safety structure of the present invention is incorporated into a tire and integrated into an integral rim, and FIG. 3 shows a safety structure 4 shown in a tubeless pneumatic tire with a tube.
The embodiments shown in FIGS. 2 and 3 also include the defective surface 2γ and the protrusion 28 shown with reference to FIGS. 1 and 5.

Further details of the safety structure according to the present invention are shown in FIG. 4, in which a portion of the shoulders 21, 21 or the top 22 of the safety structure 4 having a concave cross-sectional shape is cut out almost parallel to the detail. From the surface extending the defective surface 2γ in the circumferential direction, that is,
Although an example is shown in which the protrusion 28 protrudes radially outward from the outer circumferential circular surface 4A of the top portion 22 and extends in the tire axial direction,
Of course, this protrusion 28 may be provided only on both shoulder portions 2L21, excluding the top portion 22.

This is because when the pneumatic tire 1 loses its air due to a puncture or the like, the inner surface of the tire 11, the protrusion 28, and the defective surface 2γ generate vibration noise, which may cause damage to the occupants of the vehicle, including the driver, due to such a puncture. This is to detect the situation quickly.

However, due to recent improvements in the ride comfort of vehicles, it has been found that unless the height of the protrusion is made considerably higher, a problem will occur in which it is difficult to detect a puncture, especially when driving at high speed. In the case of the conventional safety structure shown in Fig. 1゜8, in which a protrusion protruding outward is arranged on the outer surface of the top of the structure, the protrusion suddenly hits the inner surface of the tire and then leaves when it rotates. Because it is subjected to local stress, it generates a lot of heat and breaks down in a relatively short period of time.

On the other hand, in the case of a tire with only a defective surface, the inner surface of the tire and the outer diameter surface of the safety structure are in smooth contact during rotation, and the surface drops suddenly when the defective surface is reached, but the contact area with the inner surface of the tire is large. Therefore, the ground pressure per unit area is low, so the heat generation is low, but in order to enable puncture detection, especially when driving at high speed, the depth of the defective surface must be made very deep.

This is a force that is severely restricted by the shape of the safety structure, dynamic balance, and rigidity balance ζIn order to improve this, the present invention uses the outer circular surface 4 of the Vdji-shaped top 22.
A is cut out almost parallel to the tire axial direction to create the defective surface 2.
1, and a top portion 2 is formed on the tire circumferential side of the defective surface 21.
A protrusion is formed that protrudes radially outward from the outer circumferential surface 4A of No. 2, the apex of which is connected to other points of the shoulder portion 21.21 or the top portion 22 by a substantially tangential line, and the intersection thereof is formed by a curved surface. As a result, when the tire 1 loses its air due to a puncture or the like, even if the tire inner surface 11 rides on the protrusion 28 at low speeds, the heat generation is low because the protrusion is formed as described above, and then the defective surface suddenly reaches the protrusion 28. Even when the robot falls on a surface and generates vibration noise, the ground contact pressure is small because the ground contact area is large, and even when it subsequently rides on a protrusion, the protrusion is formed with a gently curved surface, so it generates little heat.

On the other hand, at high speeds, the car rides on the protrusions in the same way as at low speeds, but at this time, the speed is fast, so it bounces off and falls onto the shoulder, producing a vibration sound, or the impact force is supported by a large area. Therefore, even if the detection of damage situations such as punctures is made almost the same, the heat generated by the protrusion, which was a serious problem with the conventional protrusion only, can be reduced from the test results shown in Fig. 1 of this example as shown in Fig. 9. As shown, it can be held much lower than conventional products.

As a result, the durability of the safety structure and tires can be improved several times.

The protrusion height H and the shoulder or top defect depth D (see FIG. 5) vary depending on the suspension system of the vehicle to which the tire of the present invention is mounted and the outer diameter and material of the safety structure 4, but the protrusion height H is 3-15TrrIrL1 shoulder or top defect depth D is 3-15. However, specifically, depending on the shape and outer diameter of the safety structure, both (H
and D).

This is preferable from the viewpoint of vibration countermeasures because it almost eliminates the mass imbalance that occurs when there are only protrusions or defects.

Further, the material of the protrusion 28 may be the same as the material of the safety structure 4 described above, or of course may be made of a material.

Furthermore, it is advantageous to generate the vibration sound when running with a flat tire once or twice per rotation of the tire, as damage to the tire due to the flat tire can be easily detected not only in low speed ranges but also in high speed ranges.

Although FIG. 6 shows an embodiment in which the protrusion 28 of the safety structure is disposed only on one side of the defective surface 210, the protrusion 28 may be disposed only on both shoulders, excluding the top.

As for the material of the safety structure 4, an elastic material having rubber-like elasticity such as a compound mainly made of natural rubber, synthetic rubber, or polyurethane is used, and the shoulder part 21.
21, the side walls 23, 23 and the protrusion 28 may be made of different materials with different compositions so that they can serve the functions required for each location.

Based on the fact that the safety structure 4 is made of an elastic material as described above, the above-mentioned method is used to prevent the risk of the safety structure 4 expanding outward due to centrifugal force when the vehicle is running at high speed. The non-extensible members 26.26 are suitably provided on the shoulders 21, 21 or on the side walls 23.23 of the safety structure 4 as required.
26 consists of one or several strips of non-stretchable material such as wire or fiber.

The inner surface of the tire 1 may be damaged while the vehicle is running due to a tire puncture, etc.
1 causes a friction phenomenon between the shoulders 21, 21 or the top 22 of the safety structure 4, leading to early damage to the pneumatic tire 1 or the safety structure 4. As a preventive measure, is the tire inner surface 11 and the shoulder 21.2 of the safety structure 4.
It is preferable that a lubricant be filled into the space 35 surrounded by the top portion 1 or the top portion 22.

This lubricant not only has good lubrication performance, but also has low heat generation and heat resistance.
The material must not swell in a short period of time, and in view of these conditions, glycerin, silicone oil, silicone grease, etc. are used in the present invention.

The present invention is a safety structure as described above, and a pneumatic tire equipped with this structure is supported by a built-in bead holding member and a rim together with the safety structure as necessary, thereby preventing tire punctures and other problems. Even if the air disappears for some reason, there is no risk of the safety structure and the pneumatic tire coming off the rim seat, and even if the tire becomes flat due to the loss of air, the tire can be removed through the shoulder and sidewall of the safety structure. It can sufficiently support and resist the weight of the vehicle transmitted to the bead and rim of the vehicle, minimize flattening, and ensure the necessary maneuverability and stability, and the effect of the lubricant. Together with this, heat generation is kept to a minimum, and vibration noise is generated by the defective surfaces and protrusions provided on the shoulder or top of the safety structure, thereby preventing the driver of the vehicle from suffering damage such as a puncture. By quickly detecting the situation,
This makes it possible to drive safely to the repair shop.

In contrast, previously known pneumatic tires comprising a safety structure having an outwardly projecting protrusion on the outer surface of the shoulder or top of the safety structure, a bead retaining member, and a split or integral rim, When driving with a flat tire due to a flat tire, etc., the speed of the car may exceed 50 per hour due to the heat generated by the protrusion.
If it is a sleeve, it can be safely traveled only for a distance of about 1100K, but a safety structure having a defective surface and a protrusion disposed at the shoulder or top part, a bead part holding member, and a split rim or an integral rim as in the present invention. With this combination, it was found that the heat generated by the defective surface and the protrusion was low, and even when traveling at a speed of 50 km/h to the repair shop, the vehicle could be driven safely for a distance of 1,100 km, which is exceptional in achieving the above-mentioned effects. It is excellent.

[Brief explanation of drawings]

Fig. 1 shows a pneumatic tire in which the safety structure of the present invention is incorporated into a split rim together with a bead holding member and filled with air, and Fig. 2 shows a state in which the split rim of Fig. 1 is replaced with an integral rim. FIG. 3 shows a different construction of the safety structure of FIG. 1, using an integral rim. Figure 4.5.6 shows an embodiment of the safety arrangement of the invention,
Fig. 4 is a partial perspective view of the same, Fig. 5 is a partial front view, Fig. 6 is a modification of Fig. 4, and Fig. 1 and 8 show an outer surface of the conventional shoulder or top portion. FIG. 3 is an exemplary perspective view showing a part of the safety structure in which a protrusion protrudes toward the safety structure. FIG. 9 is an explanatory diagram showing test results of the structure of the present invention. -1...Pneumatic tire, 2...Outboard rim, 3...Inboard rim, 4...
・・Safety structure) 5...Bead part holding member, i
o, io...beat section, 13.13...
- Inner surface of bead part, 21, 21...Top of safety structure, 22...Top support part of safety structure, 23
, 23... Side wall part of the safety structure, 25°25.
...Basal part, 27...Defect surface, 28...
...Protrusion, 29-...Air circulation hole.

Claims (1)

[Scope of Claims] 1. A pair of opposing annular side walls for engaging with the inner surface of a bead portion of a pneumatic tire, and an annular top portion in which the pair of annular side walls are connected to each other via shoulders. In the safety structure, the outer circular surface of the annular top part is partially cut out in the circumferential direction substantially parallel to the tire axis to form a defective surface, and the outer circumferential surface is formed on the circumferential side of the defective surface. A safety structure for a pneumatic tire wheel, characterized in that a projection is formed that projects radially outward from a circular surface.