JPH0858312A - Tire for emergency - Google Patents

Abstract

PURPOSE: To positively produce the vibration so as to urge a driver to exchange into a ground tire in an early stage by providing run-out parts of which a run-out quantity from the circularity of a tire is a specific value on 1-3 positions in the tire circumferential direction of a tread face. CONSTITUTION: Recessed run-out parts 4 of which a run-out quantity Δ from the circularity of a tire to the inside in the radial direction is 0.5-2.5mm are formed on 1-3 positions in the tire circumferential direction of the tread face 2 of an emergency tire T. Consequently, remarkable vibration is positively produced from the emergency tire T during running without spoiling running safety, a driver is surely let to recognize mounting of the emergency tire T, and hence he can be urged to exchange into a ground tire in an early stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency tire which is temporarily used when a ground tire is punctured, and more specifically, it is a tire for emergency use after being used for an emergency purpose by actively generating vibration. The present invention relates to an emergency tire designed to promote replacement with a ground tire.

[0002]

2. Description of the Related Art An emergency tire is a tire temporarily used for traveling to a repair place such as a nearby gas station when the ground tire is flat. For this reason, emergency tires are always stored in the luggage compartment and have a smaller diameter than grand tires so as not to occupy extra space or add extra weight load.
It is also designed to be narrow. Therefore, it is not structured to withstand long-term use, and it is desirable to replace it with a ground tire as soon as possible after the use for emergency purposes is completed, for safety reasons. However, in reality, there are users who continue to drive for a long period of time even after they have been used for emergency purposes.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an emergency tire that promptly prompts the driver to replace the tire with a ground tire by having a structure in which vibration is positively generated. To do.

[0004]

The first-aid tire of the present invention that achieves the above-mentioned object has a tread surface of 1 to 1 in the tire circumferential direction.
The amount of runout from the true circle of the tire is 0.5 to 3 points.
The feature is that a 2.5 mm run-out portion is provided. Thus, by forming 1 to 3 runout portions deviated from the true circle of the tire on the tread surface and setting the deviated runout amount to 0.5 to 2.5 mm, the runout portion and other perfect circles are It becomes imbalanced between the parts and the active tires, so that noticeable vibrations can be positively generated. Therefore, it is possible to make the driver surely recognize that the emergency tire is mounted and promptly promptly to replace it with the ground tire.

Another emergency tire of the present invention which achieves the same purpose has lateral grooves having a groove width of 10 mm or more and extending over substantially the entire width in the tire width direction at 1 to 3 places in the tire circumferential direction on the tread surface. It is characterized by being provided. In this way, by providing lateral grooves having a groove width of 10 mm or more and extending over the entire tire width on the tread surface only at 1 to 3 locations in the tire circumferential direction, the tire uniformity becomes unbalanced as described above. As a result, a noticeable vibration can be positively generated from the emergency tire while traveling.

Still another embodiment of the emergency tire of the present invention which achieves the same purpose has a tire unbalance amount of 1000.
It is characterized in that it is set to ˜3000 g · cm. By setting the amount of unbalance in this way, the vibration becomes excessive, and it is possible to positively generate a noticeable vibration from the emergency tire during traveling without impairing the traveling safety.

The tread pattern used in the present invention is
Any of a block pattern, a rib pattern, a lug pattern, or a combination thereof can be used, and any of those used for pneumatic tires can be used. Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an example of an emergency tire T of the present invention. Reference numeral 1 denotes three zigzag-shaped main grooves extending in the tire circumferential direction C on the tread surface 2, and ribs 3 are defined on the tread surface 2 along the tire circumferential direction C by the main grooves 1.

In the above-mentioned structure, when the tire is viewed from the side, as shown in FIG. 2, the runout amount (deviation amount) Δ from the true circle of the tire to the inner side in the radial direction on the tread surface 2 is shown.
A concave runout portion 4 having a thickness of 0.5 to 2.5 mm is formed. If the runout amount Δ is smaller than 0.5 mm, it is not possible to generate vibrations that the driver can feel sufficiently, and if the runout amount Δ exceeds 2.5 mm, the vibration becomes too large. As a result, driving safety deteriorates. Therefore, by setting the runout amount Δ in the range of 0.5 to 2.5 mm, it is possible to positively generate noticeable vibration from the emergency tire while traveling while maintaining safe traveling.

The runout portion 4 is provided only at one to three places in the tire circumferential direction. If the runout 4 is formed in more than three places, the runout amount is 0.5 to
Even if it is 2.5 mm, the vibration is gradually leveled and becomes a minute vibration, which makes it difficult for the driver to recognize. As described above, according to the present invention, the runout portions 4 deviated from the true circle of the tire are formed on the tread surface 2 at 1 to 3 places in the tire circumferential direction, and the runout amount is set to 0.5 to 2.5 mm. The balance at the time of rotation becomes unbalanced, and it becomes possible to positively generate a noticeable vibration from the emergency tire during running. Further, since vibration increases as the speed increases, an effect of suppressing high-speed running can be obtained, and safe running while wearing the emergency tire can be promoted.

The shape of the runout portion 4 may be convex instead of the above-mentioned concave. In addition, when a plurality of runout portions 4 are provided, it is preferable to dispose the runout portions 4 substantially equally on the tire circumference in order to make the vibration more noticeable. The run-out portion 4 provided at one location may have a length in the tire circumferential direction of at least 5 mm or more, preferably 20 to 60 mm, and more preferably about 40 mm, in order to make the noticeable vibration more positive. Good for generating.

FIG. 3 shows another example of the emergency tire of the present invention. Reference numeral 11 denotes a plurality of linear main grooves extending in the tire circumferential direction C on the tread surface, and a plurality of lateral grooves 12 are provided between the main grooves 11 along the tire width direction.
A large number of blocks 13 are formed by 2 and 2. The lateral groove 1 is wider than the lateral groove 12 and has a groove width W of 10 mm or more, and is limited to 1 to 3 positions on the tire circumference.
2a is provided over the substantially entire width in the tire width direction.

As described above, the tread surface 1 in the tire circumferential direction is
Wide lateral groove 1 with groove width W of 10 mm or more at ~ 3 places
By providing 2a over substantially the entire width in the tire width direction, the balance during rotation of the tire can be unbalanced, and noticeable vibration can be positively generated from the emergency tire during running. If the groove width W of the lateral groove 12a is less than 10 mm, it becomes difficult for the driver to perceive it as a noticeable vibration. The groove width W of the lateral groove 12a is preferably 20.
-60 mm, more preferably about 40 mm, is preferable for more prominent vibration.

When a plurality of lateral grooves 12a are provided,
As in the runout portion described above, the vibrations are more noticeable, and therefore it is preferable to dispose the tires substantially evenly on the tire circumference. FIG.
Shows still another example of the emergency tire of the present invention. The carcass layer 23 is provided with 3 to 4 layers having a bias structure and wound around the pair of left and right bead cores 21.

By providing an unbalance member 26 at one position in the tire circumferential direction on the inside of the tire of the tread 24, the uniformity during tire rotation is unbalanced, and the unbalance amount is 1000 to 3000 g · cm. Is configured as follows. If the unbalance amount is less than 1000 g · cm, the driver cannot recognize it as a noticeable vibration, and if it exceeds 3000 g · cm, the vibration becomes excessive and the driving safety deteriorates. .

The unbalance member 26 is not particularly limited as long as it imbalances the balance when the tire rotates, and for example, the same rubber material as the tire can be integrally molded during vulcanization molding. desirable. Further, as a means for making the tire rotation unbalanced, instead of attaching the unbalanced member 26, the rubber thickness of the tread 24 is changed on the tire circumference to change the balance amount, or the carcass layer 23 The amount of splice wrap may be larger than in the conventional case so as to be unbalanced, which makes the manufacturing easier than mounting the unbalance member 26 separately.

Also in the case of this embodiment, the unbalance member 2
Depending on 6, the unbalance amount is 1000-3000 g
By setting the height to cm, it is possible to positively generate a noticeable vibration from the emergency tire while traveling while maintaining safe traveling. The unbalance member 26 may be provided at a plurality of locations in the tire circumferential direction, but it is advantageous to provide it at one location in order to efficiently generate the imbalance.

The above-mentioned unbalance amount indicates the amount of unbalance when the tire mounted on the wheel is horizontal and the rotation center thereof is supported by the tire balancer. Further, in each of the above-described embodiments, each constituent element is used alone, but in the present invention, an emergency tire can be formed by combining the elements of a plurality of embodiments.

The tread pattern in the emergency tire of the present invention may be a block pattern, a rib pattern, a lug pattern, or a combination thereof, and any of those used in conventionally known pneumatic tires. Needless to say, it can be used.

[0019]

【Example】

Example 1 The tire size was T125 / 70D14, the tread pattern was the same as the block pattern shown in FIG. 5, and a concave or convex runout portion having a circumferential length of 40 mm was provided at one location on the tire circumference, as shown in Table 1. The tires 1, 2, 3 and 4 of the present invention and the comparative tires 1, 2, 3 and 4 having different runout amounts were manufactured as emergency tires.

In FIG. 5, 31 is a linear main groove extending in the tire circumferential direction C on the tread surface, 32 is a lateral groove provided between the main grooves 31 along the tire width direction, and 33 is a main groove 31. A large number of blocks defined by the lateral grooves 32 and 34 are sipes formed on the block 33 along the tire width direction. In addition, in each runout part, in the contact area avoiding the main groove of the tire, the unevenness in the tire circumferential direction excluding the burr of the vent hole, the pattern groove, and the sipes is measured with the dial gauge while rotating the tire, and the maximum value The difference between the minimum value and the minimum value was defined as the runout amount.

A rim size of 14 × was applied to each of these test tires.
When mounted on a 4T rim, the air pressure was 420 kpa, and the vibration performance evaluation test was performed under the following measurement conditions. The results shown in Table 1 were obtained. Vibration performance Tire size 185 / 65R14 (air pressure 200kpa,
Rim size 14 x 5 1 / 2J) Ground tires are mounted on the right front wheel of a front-wheel drive vehicle with a displacement of 1600cc, test tires are mounted on the right side of the vehicle, and the paved road surface is 60km / h.
The vehicle was driven at / h and the vibration performance was evaluated by the feeling of the driver inside the vehicle. The evaluation results are shown as an average of 5 drivers trained in the vibration test. ○ stands out, ◎ stands out well, × 1 stands out, × 2 means there is too much vibration and there is a danger of driving. There is.

[0022]

[Table 1]

As is clear from Table 1, the tires 1, 2, 3 and 4 of the present invention having a concave or convex runout amount of 0.5 to 2.5 mm are all compared with the comparative tire. It can be seen that a noticeable vibration can be generated without deteriorating the driving safety. Example 2 The same tire size and tread pattern as above,
Tires 5 and 6 of the present invention and comparative tire 5 in which the number of concave runout portions provided on the tire periphery were changed as shown in Table 2 were manufactured as emergency tires. Each runout amount is 1mm and its perimeter is 40mm. When the test performance of these test tires was evaluated in the same manner as described above, the results shown in Table 2 were obtained.

[0024]

[Table 2]

As is apparent from Table 2, it is understood that in order to generate a noticeable vibration, it is sufficient to dispose only one to three places on the tire circumference. Example 3 The tire size was T125 / 70D14, the tread pattern was the same as the block pattern shown in FIG. 3, a wide lateral groove was provided at one location on the tire circumference, and the groove width of the lateral groove was changed as shown in Table 3. Inventive tires 7, 8 and comparative tire 6
And were made as emergency tires. The width of each of the other lateral grooves is 3 mm. When each of these test tires was subjected to the vibration performance evaluation test in the same manner as described above, the results shown in Table 3 were obtained.

[Table 3] As is clear from Table 3, it can be seen that a noticeable vibration can be generated by setting the groove width to 10 mm or more. Example 4 The tire size was T125 / 70D14, the tread pattern was the same as the block pattern shown in FIG. 5, and an unbalance member made of a rubber material was provided inside the tire of the tread as shown in FIG. The tires 9 and 10 of the present invention and the comparative tires 7 and 8 which were changed as shown in FIG. When each of these test tires was subjected to a vibration performance evaluation test in the same manner as described above, the results shown in Table 4 were obtained.

[0026]

[Table 4] As is clear from Table 4, the unbalance amount is 1000-
It can be seen that a noticeable vibration can be generated by setting it to 3000 g · cm.

[0027]

As described above, the emergency tire of the present invention is
Runout parts with run-out amount from the true circle of the tire to 0.5 to 2.5 mm are provided at 1 to 3 places in the tire circumferential direction on the tread surface. It is possible to proactively generate noticeable vibration from the emergency tires while driving, without failing to make the driver surely recognize the installation of the emergency tires, and replace it with a ground tire early. Can be encouraged.

Further, the tread surface has 1 to 3 in the tire circumferential direction.
By providing a wide lateral groove having a groove width of 10 mm or more over substantially the entire width in the tire width direction at the location, the wide lateral groove can positively generate noticeable vibration from the running emergency tire. . Also, by setting the tire unbalance amount to 1000 to 3000 g · cm, a noticeable vibration is positively generated from the emergency tire while traveling, and the driver is sure to recognize the wearing of the emergency tire. Therefore, it is possible to promote the early replacement of the ground tire.

Further, since the vibration is generated in accordance with the rotation of the tire, the vibration becomes larger especially when traveling at a high speed, and it is possible to give a warning for suppressing the speed and allowing the vehicle to travel safely.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an example of an emergency tire of the present invention.

2 is an explanatory side view of FIG.

FIG. 3 is a main part plan view showing another example of the emergency tire of the present invention.

FIG. 4 is a meridian section explanatory view showing still another example of the emergency tire of the present invention.

FIG. 5 is a main part plan view showing a block pattern of a test tire used in a vibration performance evaluation test.

[Explanation of symbols]

1,11,31 Main groove 2 Tread surface 3 Rib 4 Runout part 12,32 Lateral groove 12a Wide lateral groove 13,33 Block 26 Unbalance member C Tire circumferential direction T First-aid tire W Groove width of wide lateral groove Δ Runout amount ( Deviation amount)

Claims (3)

[Claims] 1. A runout amount from a perfect circle of a tire is 0.5 to 2.5 at 1 to 3 places on the tread surface in the tire circumferential direction.
Emergency tire with mm run-out section. 2. An emergency tire in which lateral grooves having a groove width of 10 mm or more and substantially the entire width in the tire width direction are provided at 1 to 3 positions on the tread surface in the tire circumferential direction. 3. A tire unbalance amount of 1000 to 3
A first-aid tire with a weight of 000g · cm.