JP5998436B2 - Temporary tires - Google Patents

Description

The present invention relates to a structure of a temporary tire that can recognize a decrease in tire air pressure.

Temporary tires (emergency tires) are tires that are used as an emergency when a ground tire that is normally mounted on a vehicle cannot be used due to puncture or the like. Temporary tires are usually stored in a vehicle and are lighter and smaller in size so that they can be easily installed in an emergency, and are not designed to withstand long-term use. Since the usage time is low, the time for storage in the vehicle for a long period of time is also long, so the tire pressure may not be checked, and the tire pressure may be greatly reduced during emergency use. . Alternatively, the replacement to the ground tire may be extended without knowing that the air pressure has decreased. In such a case, if the vehicle is run as it is, the attached temporary tire may also break down. Therefore, it is necessary to replace the ground tire or fill the air pressure of the temporary tire as soon as possible.

However, it is difficult for a general driver to know whether or not the tire pressure of the temporary tire has decreased, and it is often noticed after the temporary tire breaks down. Thus, many methods have been proposed to encourage the replacement of temporary tires. For example, FIG. 8 is a diagram showing an example of a conventional method for promoting the replacement of a temporary tire. As shown in FIG. 8, the minimum repeating unit of design elements (A, B) constituting a tire tread pattern is shown. There are proposed emergency tires in which two types (La, Lb) or three types having different pitch lengths are used, and the same design elements are arranged so that the same elements are continuous over an area of at least 10% of the tire circumferential length. (Patent Document 1) By adopting such a design element, sound of different frequencies (pure sound) is repeatedly generated by a certain length, and an emergency tire is securely attached to a driving driver. This makes it possible to promptly replace the tire with a ground tire.

FIG. 9 is a view showing another example of the conventional method for promoting the replacement of the temporary tire. As shown in FIG. 9, the tire T is provided at 1 to 3 locations in the tire circumferential direction of the tread surface 2. There has also been proposed an emergency tire provided with a runout portion 4 having a runout amount Δ from a perfect circle of 0.5 to 2.5 mm. (Patent Document 2) Such a runout portion deviating from a perfect circle positively generates a noticeable vibration from the emergency tire during traveling without impairing traveling safety, thereby ensuring the emergency of the driver. This makes it possible to recognize the wearing of the tire and prompt the user to replace it with a ground tire at an early stage.

Furthermore, FIG. 10 is a diagram showing a conventional method for recognizing that the tire air pressure has decreased. As shown in FIG. 10, a plurality of protrusions are provided in the tire circumferential direction on the side wall of the vehicle. Each of the protrusions 20 is a pneumatic tire, and includes a slit 22 extending in the tire radial direction (see FIG. 10 (A)). A pneumatic tire is also proposed in which the wall portion is bent and the slit is opened. (Patent Document 3) When the tire air pressure decreases, the sidewall portion outside the vehicle bends in the vicinity of the tire contact point, and a slit extending in the tire radial direction opens (see FIG. 10B). Based on the opening and closing of the slits positioned, it is possible to easily and reliably recognize a decrease in tire air pressure.

JP 08-025907 JP 08-058312 JP 2010-76474 A

With the method described in Patent Document 1, it is impossible to grasp whether or not the tire pressure of the temporary tire is lowered because a sound is always generated when the vehicle is run with the temporary tire mounted. In addition, despite the fact that it is a normal temporary tire, there is a problem that an unpleasant sound (depending on the person) must be heard until the next replacement place.

The method described in Patent Document 2 cannot always grasp whether or not the tire pressure of the temporary tire is lowered because vibration is always generated when the vehicle is run with the temporary tire mounted. In addition, despite the fact that the tire is a normal temporary tire, there is a problem in that it is inevitably subject to unpleasant vibration (depending on the person) until the next replacement place.

Further, in the methods described in Patent Document 1 and Patent Document 2 described above, it is impossible to determine whether the tire air pressure has decreased, and therefore a tire that has already started to malfunction may be used for a relatively long time. Moreover, since it is not known even if the tire air pressure decreases, it is possible to forget to fill the tire air and store it again in the vehicle and use it again.

The method described in Patent Document 3 only shows an identifiable pattern change on the side wall portion of the tire, so that the driver who is in the car cannot see it. There is a problem that it is impossible to know that the air pressure of the tire has decreased and it is not always useful for grasping the prior failure of the tire. Another problem is that it is difficult to understand if the wheels are dirty. Furthermore, when the car stops, it is difficult to identify the change in the pattern, and eventually the driver has an inherent problem that it is difficult to notice.
As described above, the conventional method has many methods for grasping that the temporary tire is used, and no method for easily grasping that the air pressure of the temporary tire is lowered has been proposed.

The present invention realizes a tire structure in which the tire pressure can be grasped immediately after wearing a temporary tire and running when the tire pressure is lowered when stored in a vehicle and used in an emergency. did. Furthermore, the present invention has realized a tire structure that can grasp that the tire air pressure is lowered when the tire air pressure is lowered in the middle of the tire even when there is no problem at the beginning of use in an emergency. Specifically, it is as follows.

(1) The present invention provides a tire diameter having a length that makes contact with a flat road surface when a tire air pressure is lower than a normal tire air pressure when the vehicle travels in a sidewall portion on the outer side in the tire radial direction from the tire maximum width position. A temporary tire characterized in that a protrusion extending outward in the direction is provided. 1 to 6 of these protrusions are arranged in the tire circumferential direction, and the distance between the radially outer tip of the protrusion and the flat road surface is 2 mm to 20 mm at normal tire air pressure during vehicle running. It is characterized by being. Furthermore, the distance between the radially outer tips of the plurality of protrusions and the flat road surface is different.

(2) Further, in the protrusion according to the present invention, the length T in the tire circumferential direction of the protrusion is 1 mm ≦ T ≦ 0.5 × the tire circumference, and the portion where the sidewall rubber of the tire and the protrusion are joined is provided. The width W of the protrusion in the tire width direction is 2 mm or more. Further, the height H on the tire where the protrusions are arranged is 0.4xSH ≦ H ≦ 0.93xSH with respect to the tire cross-section height SH, and the width of the protrusions in the tire width direction is the tire width. It is characterized by being equal to or greater than from the radially outer side toward the inner side.

(3) The projecting object of the present invention is detachable from the tire, and the projecting object has a concave or convex shape at a portion where the projecting object is coupled to the sidewall portion, and the projecting object is coupled. The shape of the sidewall portion is a shape that fits in correspondence with the shape of the protrusion.

Since the tire is crushed when the tire air pressure decreases, the protrusion of the present invention contacts the road surface. Since the protrusions are intermittently coupled in the tire circumferential direction, the protrusions of the present invention repeatedly hit the road surface according to the rotation of the wheels while the vehicle is running. As a result, an abnormal noise is generated, so that the driver of the car recognizes that the tire air pressure is decreasing. Since the distance from the tip of the plurality of protrusions to the road surface is different, or because the width of the protrusions in the tire width direction is equal to or greater from the outer side to the inner side in the tire radial direction, the tire air pressure is increased. Since the number of times of contact with the road surface and the contact area increase with the decrease, the driver recognizes a larger abnormal sound or a different abnormal sound and is strongly aware of tire replacement. In particular, in the case of a temporary tire, since it is necessary to quickly replace the tire when the tire air pressure decreases, the present invention exhibits a greater effect.

FIG. 1 is a diagram showing a right-half cross-sectional structure in the tire width direction of a temporary tire according to the present invention. FIG. 2 is a tire cross-sectional view showing a mounting position of the protrusion according to the present invention. FIG. 3 is a view of a temporary tire having a protrusion according to the present invention as viewed from the width direction. FIG. 4 is a diagram schematically illustrating a state in which L is changed. FIG. 5 is a view showing a combined shape of the projecting object and the sidewall part when the projecting object of the present invention is coupled and fixed to the sidewall part of the tire. FIG. 6 is a diagram showing another embodiment relating to a method for attaching the protrusion of the present invention to a sidewall portion of a tire. FIG. 7 is a diagram showing various shapes related to the protrusions of the present invention. FIG. 8 is a diagram illustrating an example of a conventional method for promoting tire replacement. FIG. 9 is a diagram illustrating another example of a conventional method for promoting tire replacement. FIG. 10 is a diagram illustrating a conventional method for recognizing that the tire air pressure has decreased.

When the tire pressure of the temporary tire decreases, the tire cross-section height decreases, and the fin-like protrusion attached to the sidewall portion of the tire of the present invention comes into contact with the road surface. This contact generates an unusual sound during traveling, so that the driver can recognize a decrease in the tire air pressure of the temporary tire even during driving.

FIG. 1 is a diagram showing a right-half cross-sectional structure in the tire width direction of a temporary tire according to the present invention. The temporary tire 11 includes a tread portion 13, a sidewall portion 15 connected to the tread portion 13, and a bead portion 17 connected to the sidewall portion 15, and a rim 19 is attached to the bead portion 17 of the tire 11. The protrusions 23 of the present invention are attached to the tire radial direction outer side than the maximum tire width position 21 in the sidewall portion 15, that is, the sidewall upper portion 16, and the tire radial direction outer side, that is, the tire 11 (the tread portion 13). Extends to the road surface side in a columnar shape when grounded to the flat road surface 25.

The tip portion 23T (which is the upper end portion in FIG. 1) of the protrusion 23 does not contact the flat road surface 25 when the tire pressure is normal. That is, when the distance between the tip (outside in the radial direction) of the protrusion 23 and the flat road surface is L, L> 0 is meant. When the tire air pressure decreases, the projecting object 23 comes into contact with the road surface, and a sound at the time of contact is emitted as the tire rotates during traveling. Since this sound is a tire sound different from the case of no contact, the driver can recognize that the tire air pressure has decreased.

Actually, L is required to some extent, and in the present invention, L is preferably 2 mm to 20 mm. When L is less than 2 mm, even when the temporary tire mounted on the vehicle is at normal air pressure, the protrusions 23 and the flat road surface often come into contact with each other, and this is indistinguishable from the case where the air pressure is lowered. When L exceeds 20 mm, the projecting object and the road surface do not come into contact with each other even if the air pressure decreases. Here, “normal tire pressure” is the same as the definition of tire cross-section height described later, and is “maximum air pressure” defined by JATMA. However, in the case of tires for passenger cars, the specified internal pressure is an air pressure of 180 [kPa] The specified load is 88 [%] of the maximum load capacity. Or the “TIRE” defined in TRA
The maximum value of “LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” or “INFLATION PRESSURES” defined in ETRTO. “No contact with the flat road surface 25 at normal tire pressure” means “maximum load capacity” defined by JATMA, “TIRE defined by TRA”.
This means that the maximum value of “LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” or “LOAD CAPACITY” defined in ETRTO is not in contact with a flat road surface.

FIG. 2 is a tire cross-sectional view showing a mounting position of the protrusion according to the present invention. As described above, the protrusions 23 are disposed on the sidewall upper portion 16 on the outer side in the tire radial direction from the maximum width position 21 of the tire. Actually, it is attached to the sidewall rubber 27. The height of the mounting position of the protrusion 23 is represented by a distance H from the bead toe 18. More precisely, from the bead line BL passing through the pair of bead toes 18, the midpoint of the width W (Wb) of the connecting portion between the protrusion and the tire shown in the enlarged view in the vicinity of the protrusion 23 in FIG. Let H be the distance to M. That is, H is the height (mounting height) on the tire where the protrusion is disposed. When the tire cross-section height is SH, the height H on the tire where the mounting height H of the projecting object of the present invention is arranged is:
0.4xSH ≦ H ≦ 0.93xSH
To be. If H is in this range, the tire tip 23T can come into contact with the road surface and generate an abnormal sound when traveling with the tire air pressure lowered, so it is possible to warn of a decrease in tire air pressure. It becomes. The cross-sectional height is the “maximum air pressure” defined by JATMA. However, in the case of passenger car tires, the specified internal pressure is an air pressure of 180 kPa and the specified load is 88% of the maximum load capacity. is there. Or the “TIRE” defined in TRA
The maximum value of “LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” or “INFLATION PRESSURES” specified in ETRTO is filled, “Maximum load capacity” specified in JATMA, “TIRE” specified in TRA
The maximum value of “LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” or the tire cross-section height under the condition of “LOAD CAPACITY” defined in ETRTO. Further, the mounting height H of the protrusion is a value under the same conditions.

The width Wb of the protrusion at the connection portion with the side wall rubber 27 is preferably 2 mm or more in view of the strength of the protrusion. Here, the width of the protrusion means the thickness of the protrusion in the tire width direction. The width W of the projecting object is desirably equal to or greater than the shape of the projecting object from the radially outer side toward the inner side. In other words, when the width of the tip end portion 23T of the projecting object is W (Wt), the width W of the projecting object is such that the width W of the projecting object is from the connecting portion with the sidewall rubber 27 of the projecting object. It is desirable to keep the same or even thinner up to the tip. For example, Wt ≦ W ≦ Wb. It is desirable to make it thinner gradually. By doing so, the contact area between the protrusion and the road surface can be increased as the tire air pressure decreases, so that a larger abnormal noise can be generated as the tire air pressure decreases. . As a result, the driver can strongly recognize that the air pressure has decreased with a loud warning sound.

FIG. 3 is a view of a temporary tire having a protrusion according to the present invention as viewed from the width direction. The protrusions 23 of the present invention are attached to the sidewall portion 15 (sidewall upper portion 16), and are attached at least one place on the tire circumference and a maximum of six places. If even one place is attached, the projecting object 23 comes into contact with the road surface while traveling and generates an abnormal sound. If the number of protrusions is increased, the number of occurrences of abnormal noise increases, so that replacement can be more strongly urged. However, if there are more protrusions 23 than 6, the abnormal sound cannot be noticeable. In particular, when the rotation speed of the tire is increased, that is, when the speed of the vehicle is increased, the abnormal sound is not lifted and the recognition as the abnormal sound is reduced. The arrangement intervals of the protrusions 23 do not necessarily have to be equal as long as abnormal sounds are recognized, but it is easier to design if they are equal in design and production. In FIG. 3, the protrusions 23 are arranged at substantially the same intervals, and the protrusions 23 are arranged at four locations (23-1, 23-2, 23-3, and 23-4).

In FIG. 3, it is desirable that 1 mm ≦ T <0.5x (2πR) where T is the length of the protrusion in the tire circumferential direction. Here, R is the distance in the tire radial direction from the tire center of the protrusion 23, that is, the tire radius at the portion of the protrusion 23, and 2πR is the tire circumference at the portion of the protrusion 23. If T is less than 1 mm, the rigidity of the protrusion cannot be secured, and abnormal noise will not be noticeable if T is more than half the length of the tire circumference. Thus, the protrusion of the present invention is a plate-like protrusion having a certain width in the tire width direction, a certain length in the tire circumferential direction, and a certain height in the tire radial direction.

Further, by arranging a plurality of protrusions 23 having different distances L from the road surface, it is possible to change the number of times the protrusions contact the road surface due to a difference in tire air pressure. For example, the protrusion 23 (23-1, 23-2, 23-3, 23-4) disposed on the four sidewall portions 15 shown in FIG. The distance L is changed. FIG. 4 is a diagram schematically showing a state in which the L is changed. As shown in FIG. 4, the distances between the tips of the projecting objects 23-1, 23-2, 23-3, and 23-4 and the road surface 25 are L1, L2, L3, and L4, respectively. By changing L1, L2, L3, and L4, the number of protrusions 23 that come into contact with the road surface increases as the tire air pressure decreases, so that abnormal noise changes each time.

When the tire pressure is normal (the tire pressure at this time is P0), no projecting object 23 comes into contact with the flat road surface, so that no abnormal noise is generated from the tire. When the tire pressure gradually decreases to the air pressure P1 (P1 <P0), since L1 <L4 <L2 <L3, the protrusion 23-1 comes into contact with the road surface and abnormal noise is generated. At this time, it should be noted that the tire may be replaced with a ground tire. If you continue to ride in the car and the air pressure P2 (P2 <P1 <P0), where the tire pressure further decreases, the projecting object 23-4 also contacts the road surface, and the projecting object 23-1 is already in contact. As a result, a larger abnormal sound (or an abnormal sound with a different tone) is generated when both are combined.

Next, when the tire pressure further decreases to an air pressure P3 (P3 <P2 <P1 <P0), the projecting object 23-2 also contacts the road surface, and the projecting objects 23-1 and 23-4 have already contacted. As a result, a louder abnormal sound (or an abnormal sound with a different tone) is generated when the three parties are combined. Although it is possible to continue riding as it is, if the tire pressure further decreases to P4 (P4 <P3 <P2 <P1 <P0), the projecting object 23-3 also contacts the road surface, and the projecting object 23-1 , 23-4 and 23-3 are already in contact with each other, so the abnormal noises (or abnormal sounds of different tones) that cannot be tolerated by the four parties are combined, and the tires must be replaced with ground tires.

If the mounting position (height) H of the projecting object 23 is the same, changing L means that the length of the projecting object in the tire radial direction, that is, the projecting position 29 from the mounting position 29 of the projecting object 23. This is the same as changing the distance (the length of the protruding object) to the tip 23T of the object 23. If the lengths in the tire radial direction of the protrusions 23-1, 23-2, 23-3 and 23-4 are u1, u2, u3 and u4, by changing these u1 to u4, L1 L4 can be changed. (The relationship of u1 + L1 = u2 + L2 = u3 + L3 = u4 + L4 is established.) The attachment position 29 is a height H position in the sidewall portion 15 in FIG. 2, and the direction of 29 is the tire circumferential direction X. Further, the u1 and the like of the protrusion 23 and the L direction are the tire radial direction Y. That is, if a projecting object having a different length is attached, the abnormal sound of the tire can be easily changed according to the decrease in the tire air pressure. Alternatively, the same effect can be exhibited even when the protrusions 23 having the same length are attached by changing the attachment position (height) H of the protrusions 23.

Next, the shape in the case where the protrusion of the present invention is attached to the sidewall portion of the tire to be coupled and fixed will be described. FIG. 5 is a diagram showing the shapes of the protrusions and the sidewall portions when the protrusions of the present invention are coupled and fixed to the sidewall portions of the tire. In this embodiment, the shape of the projecting object 23 in the part 31 which joins the projecting object 23 and the sidewall rubber 27 of the sidewall portion 15 of the tire is a convex shape. On the other hand, the shape of the portion 32 of the sidewall rubber 27 in the sidewall portion 15 that receives the convex coupling portion 31 in the protrusion 23 is concave so that it can be fitted in correspondence with the convex portion 31. It has become. In addition, in FIG. 5A, the tip 33 of the convex portion 31 of the protrusion 23 swells in a spherical shape, so that the concave engaging portion 32 of the sidewall rubber 27 also corresponds to this spherical portion. When the convex portion 31 of the protrusion 23 is fitted to the concave portion 32 of the sidewall rubber 27, the protrusion 23 is difficult to come off. On the other hand, since the sidewall portion 15 is made of rubber, it is not so difficult to attach the protrusion 23. Therefore, the protrusion 23 can be easily attached to the sidewall portion 15 and can be firmly coupled during traveling.

In the drawing shown in FIG. 5B, the tip 34 of the protrusion 31 of the protrusion 23 is a substantially T-shaped umbrella-shaped overhang, and therefore the concave engagement portion 32 of the sidewall rubber 27 is also provided. A concave portion corresponding to the substantially T-shaped umbrella-shaped overhanging portion is formed, and once the convex portion 31 of the protrusion 23 is fitted into the engaging portion 32 of the sidewall rubber 27, FIG. The structure is more difficult to remove than shown. Therefore, it does not come off naturally during normal driving. On the other hand, since the sidewall portion 15 is made of rubber, it is not so difficult to attach the protrusion 23. Therefore, the protrusion 23 can be easily attached to the sidewall portion 15 and can be firmly coupled during traveling.

FIG. 6 is a diagram showing another embodiment relating to a method for attaching the protrusion of the present invention to a sidewall portion of a tire. In this embodiment, contrary to the case shown in FIG. 5, a part 35 of the sidewall rubber 27 of the sidewall portion 15 projects into a convex shape, and the projecting convex portion 27 is a concave portion of the projecting object 23. It engages with a shaped engagement portion 36. Moreover, since the tip of the convex portion 37 of the sidewall rubber 27 is a substantially T-shaped umbrella-shaped overhang portion, the convex portion 35 of the sidewall rubber 27 is joined to the concave engagement portion 36 of the protrusion 23. Once fitted, the structure is very difficult to remove. On the other hand, since the sidewall portion 15 is made of rubber, it is not so difficult to attach the protrusion 23. Therefore, the protrusion 23 can be easily attached to the sidewall portion 15 and can be firmly coupled during traveling. As described above, if the protrusion 23 and the sidewall rubber as shown in FIG. 5 or FIG. 6 are shaped so as to be fitted to each other, the protrusion 23 can be detached from the tire. The fitting shapes shown in FIGS. 5 and 6 are not limited to these, and various fitting shapes can be selected.

The method of making the projecting object 23 shown in FIG. 5 or FIG. 6 as an individual part can be removed and attached any number of times, so that even if the projecting object 23 is damaged, there is no problem with the temporary tire of the main body. A new protrusion 23 can be substituted. Since the projecting object 23 is a small member, the price is low, so that the cost merit is great. As a method of attaching the protrusions 23 to the sidewall portions 15, other than the method shown in FIGS. 5 and 6, an integrated structure in which the protrusions are attached to the sidewall portions from the beginning at the time of molding the tire can be used.

FIG. 7 is a diagram showing various shapes related to the protrusions of the present invention. 7A to 7H, the protrusion 23 is attached to the sidewall rubber 27. In FIG. 7, the A1 direction (upper side) is the tire radial direction outer side, and the A2 direction (lower side) is the tire radial direction inner side. The shape of the protrusions in each of the drawings (a) to (h) is equal to or greater than the width of the protrusions from the outside in the tire radial direction to the inside (Wt ≦ as described in FIG. 2). This is an example of the shape of the protrusion satisfying W ≦ Wb). FIG. 7A shows a case where the width W of the protrusion 23 is constant. FIG. 7B shows a shape in which W of the projecting object 23 gradually decreases and the upper end is flat. FIG. 7 (c) is similar in shape to FIG. 7 (b), but is an elongated type. In FIG. 7 (d), W of the protrusion 23 decreases stepwise, and the upper end is round. The figure (e) is a type in which the width W of the protrusion 23 is constant but the upper end is round. FIG. 7F shows a shape in which W of the protrusion 23 gradually decreases and the upper end is round. FIG. 7G is a type in which W of the projecting object 23 decreases stepwise and the upper end is flat. FIG. 7H shows a type in which W of the projecting object 23 gradually decreases and the tip is sharp. As described above, the present invention can employ projecting objects having various shapes, and can select projecting objects that can generate various tones corresponding to these shapes or abnormal sounds having various volumes. .

Various materials can be used as the projection material. For example, various rubbers used for tires such as styrene butadiene rubber, butadiene rubber, butyl rubber, natural rubber, and synthetic natural rubber can be used. In addition, rubber materials such as silicone rubber, fluorine rubber, acrylic rubber, propylene rubber, and other polymer materials can be used. Furthermore, metal materials such as stainless steel can also be used. It can be appropriately selected depending on the effect of abnormal noise, durability, and other uses.

Temporary tires (size: T145 / 70D17, rim size: 17X4T, air pressure: 300kPa) are mounted on the right front wheel of the front-wheel drive vehicle, and other wheels are ground tires (size: 205 / 60R16, rim size: 16X61 / 2J, air pressure: 220kPa) ), Traveling on a paved road surface at a speed of 60 km / h, and evaluating the noise performance with the feeling of the driver in the car. (The standard air pressure of the temporary tire is 420 kPa.) The results are shown in Table 1. The evaluation results are shown as an average of five drivers trained in the noise test, and were given a three-level evaluation of “◎-well-conspicuous, ○ -conspicuous, △ -inconspicuous”.

From this result, in particular, the distance L between the projecting object and the road surface is “2 mm to 20 mm”, the tire circumferential direction length T is “1 mm to 0.5 × (2πR)”, and the projecting object tire. If the radial width is “2 mm or more” and the number of protrusions is “1 to 6”, it can be seen that there is an effect of the protrusions.

As described above, by attaching the protrusion of the present invention to the sidewall portion (upper side wall) of the tire, the protrusion of the present invention does not contact the flat road surface at normal tire pressure, but the tire pressure When the tire pressure drops below the normal tire pressure and the tire is crushed, the protrusion of the present invention comes into contact with a flat road surface. When the car is running, this protrusion repeatedly hits the road surface and generates an abnormal sound. The driver recognizes this abnormal sound and knows that the tire pressure has decreased, and feels that it is necessary to replace the tire. Continuing to drive while the tire pressure is reduced leads to tire failures such as punctures, but using the protrusions of the present invention can prevent tire failures such as punctures. In particular, the present invention is very effective for temporary tires (emergency tires) in which a decrease in tire air pressure tends to cause a tire failure such as puncture.

In addition, it cannot be overemphasized that the said content can be applied to the said other part regarding that it can apply without contradiction also to the other part which was not described about the content described and demonstrated in a certain part of the specification. Furthermore, the said embodiment is an example, and can be implemented in various changes within the range which does not deviate from a summary, and it cannot be overemphasized that the right range of this invention is not limited to the said embodiment.

The tire having the protrusions of the present invention can be used not only for temporary tires but also for various pneumatic tires.

2 ... tread surface,
4 ... Runout part,
11. Temporary tires
13 ... tread part,
15 ... side wall part,
16 ... Upper side wall,
17 ... Bead part,
18 ... Bead Toe,
19 ... Rim,
20 ... protrusion,
21: Maximum width position of tire,
22 ... Slit 23 ... Projection,
24 ... slit surface,
25 ... a flat road surface,
26 ... slit surface,
27 ... side wall rubber,
28 ... the outer surface,
31 ... convex part,
32... Concave engagement portion of the sidewall rubber 27,
33 ... the tip of the protrusion 31 of the protrusion 23,
34 ... the tip of the protrusion 31 of the protrusion 23,
35 ... convex portion of the sidewall rubber 27,
36... Concave engagement portion of the protrusion 23;
37 ... convex portion of the sidewall rubber 27,

Claims (11)

In the sidewall portion on the outer side in the tire radial direction from the maximum tire width position, a projecting shape extending outward in the tire radial direction has a length that makes contact with a flat road surface when the tire air pressure is lower than the normal tire air pressure when the vehicle is running A temporary tire characterized by providing a thing,
The protrusion is detachable from the tire, and the shape of the protrusion is concave or convex at the portion where the protrusion is combined with the sidewall portion, and the sidewall portion where the protrusion is combined The temporary tire is characterized in that the shape is a shape that fits in correspondence with the shape of the protrusion. In the sidewall portion on the outer side in the tire radial direction from the maximum tire width position, a projecting shape extending outward in the tire radial direction has a length that makes contact with a flat road surface when the tire air pressure is lower than the normal tire air pressure when the vehicle is running A temporary tire characterized by providing a thing,
A plurality of the protrusions are arranged in the tire circumferential direction, and the distance between the front end of the plurality of protrusions in the tire circumferential direction in the tire radial direction and the flat road surface is different . Temporary tire, characterized in that the height of the protrusions is different . In the sidewall portion on the outer side in the tire radial direction from the maximum tire width position, a projecting shape extending outward in the tire radial direction has a length that makes contact with a flat road surface when the tire air pressure is lower than the normal tire air pressure when the vehicle is running A temporary tire characterized by providing a thing,
The width of the projecting object in the tire width direction is the same from the connecting part of the projecting object to the sidewall rubber to the tip of the projecting object on the outer side in the tire radial direction, or the connection to the sidewall rubber of the projecting object The temporary tire according to claim 1, wherein the tire gradually becomes thinner from a portion to a tip end portion of a protrusion on the outer side in the tire radial direction. The temporary tire according to any one of claims 1 to 3, wherein 1 to 6 protrusions are arranged in a tire circumferential direction. 5. The distance between the radially outer tip of the protrusion and the flat road surface is 2 mm to 20 mm when the tire pressure is normal when the vehicle is running. Temporary tires. A plurality of the protrusions are arranged in the tire circumferential direction, and the distance between the front ends of the plurality of protrusions in the tire radial direction and the flat road surface is different. The temporary tire according to any one of the above. The temporary tire according to any one of claims 1 to 6, wherein a length T of the protrusion in the tire circumferential direction is 1 mm ≤ T ≤ 0.5 x tire circumference. The temporary tire according to any one of claims 1 to 7, wherein a width of the protrusion in the tire width direction at a portion where the sidewall rubber and the protrusion are joined is 2 mm or more. The height H on the tire where the protrusions are arranged is relative to the tire cross-section height SH.
The temporary tire according to claim 1, wherein 0.4 × SH ≦ H ≦ 0.93 × SH. The width of the projecting object in the tire width direction is the same from the connecting part of the projecting object with the sidewall rubber to the tip of the projecting object on the outer side in the tire radial direction, or the connecting part of the projecting object with the sidewall rubber The temporary tire according to any one of claims 1 to 9 , characterized in that the tire gradually becomes thinner from the tip of the projecting object on the outer side in the tire radial direction . The projecting object is detachable from the tire, and the shape of the projecting object is concave or convex at the site where the projecting object is coupled to the sidewall part, and the shape of the sidewall part to which the projecting object is coupled is The temporary tire according to any one of claims 1 to 10, wherein the temporary tire has a shape that fits in correspondence with the shape of the protrusion.