JP3124877U - Pneumatic tire - Google Patents

Abstract

Provided is a pneumatic tire capable of reducing a contact pressure of a shoulder portion due to contact between a bulge portion provided in a sidewall portion and a rim flange on a rim flange side having a large height in a tire radial direction. .
A groove 15a for deforming the bulging portion 15 in the tire radial direction by abutment between the bulging portion 15 and the outer rim flange 22 is provided in the bulging portion 15 provided in the side wall portion on the outer rim flange 22 side. Since it is provided, the contact pressure of the shoulder portion 13 can be reduced by the buffering effect of the groove 15a, and it is possible to effectively prevent the occurrence of uneven wear due to the contact pressure of the shoulder portion 13 becoming higher than the opposite side. it can.
[Selection] Figure 2

Description

  The present invention relates to a pneumatic tire used for a passenger car, for example.

  In recent years, as a pneumatic tire for a passenger car, a flat tire tends to be preferred as the output of the vehicle is increased and the driving stability is improved. On the other hand, such flat tires provide a high-sports visual impression when mounted on a wheel, and also improve the appearance, so that it not only functions as a tire but also functions as a decorative part in combination with the wheel. Is also required. However, since flat tires increase the inner diameters of tires and wheels, there are problems such as excessive improvement in motion performance, lowering riding comfort, and occurrence of uneven wear due to the increase in inner diameter.

Therefore, by forming the rim flange on the outer side in the tire width direction so that the height in the tire radial direction is larger than that on the inner rim flange, the inner diameter size of the tire looks larger than the actual size, There is known one in which a visual impression of a flat tire can be obtained without increasing the inner diameter of the wheel (see, for example, Patent Document 1).
JP 2004-359078 A

  By the way, in the pneumatic tire, a bulging portion for protecting the rim flange from contact with a curbstone or the like is provided in a sidewall portion on the rim flange side having a large height in the tire radial direction. However, since the bulging part comes into contact with the tip of the rim flange in the tire radial direction, the contact between the bulging part and the rim flange suppresses the bending of the tire, and the ground contact pressure of the shoulder part is opposite. There is a problem that it becomes higher than that and uneven wear occurs.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to make contact between the bulge portion provided on the sidewall portion and the rim flange on the rim flange side having a large height in the tire radial direction. An object of the present invention is to provide a pneumatic tire capable of reducing a contact pressure of a shoulder portion due to contact.

  In order to achieve the above object, the present invention is mounted on a wheel in which the height of one rim flange in the tire radial direction is larger than that of the other rim flange, and the rim flange having a large tire radial height. In the pneumatic tire in which a bulging portion that bulges outward in the tire width direction is provided in the tire circumferential direction on the side sidewall portion, and the bulging portion is in contact with the tip of the rim flange in the tire radial direction, The bulge portion is provided with at least one groove that deforms the bulge portion in the tire radial direction by contact with the rim flange.

  As a result, when the bulging portion comes into contact with the outer rim flange, the bulging portion is deformed in the tire radial direction by the groove, so that the bulging portion and the outer rim flange are arranged on the rim flange side having a large height in the tire radial direction. The contact pressure of the shoulder due to contact with the groove is reduced by the buffering effect of the groove.

  According to the present invention, since the contact pressure between the shoulder portion and the outer rim flange can be reduced on the rim flange side having a large height in the tire radial direction, the contact pressure of the shoulder portion can be reduced. It is possible to effectively prevent the occurrence of uneven wear due to being higher than the opposite side.

  1 and 2 show a first embodiment of the present invention. FIG. 1 is a partial front sectional view of a pneumatic tire, and FIG. 2 is an enlarged sectional view of an essential part thereof.

  The tire 10 shown in the figure includes a tread portion 11 formed on the outer peripheral surface of the tire, sidewall portions 12 formed on both sides in the tire width direction, and a shoulder formed between the tread portion 11 and the sidewall portions 12. The bead core 14a is embedded in each bead portion 14 in an annular shape in the circumferential direction of the tire 10. On the outer surface side of one sidewall portion 11, a bulging portion 15 that abuts on the tip of an outer rim flange 22 to be described later is provided across the tire circumferential direction, and the bulging portion 15 is substantially in the center in the radial direction of the sidewall portion 11. It is formed to bulge outward in the tire width direction.

  The wheel 20 to which the tire 10 is mounted includes a wheel main body 21 disposed on the radially inner side of the tire 10, an outer rim flange 22 provided on one end side in the width direction of the wheel main body 21, and a width direction of the wheel main body 21. The inner rim flange 23 is provided on the other end side, and the radial height H1 of the outer rim flange 22 is formed larger than the radial height H2 of the inner rim flange 23.

  Further, the bulging portion 15 of the tire 10 is provided with a groove 15a extending in the tire circumferential direction, and the groove 15a is formed such that its depth direction extends in the tire width direction. In this case, the grooves 15a are provided intermittently or continuously in the tire circumferential direction, and are formed so that the total length in the tire circumferential direction is 60% or more and 100% or less of the entire circumference. The groove 15a is formed so that the width L1 in the tire radial direction is 20% or more and 60% or less with respect to the range A of 30 mm from the tip of the outer rim flange 22 toward the outer side in the tire radial direction. In addition, 30 mm of the range A is a value in a no-load state. Further, the groove 15a is formed such that the height L2 in the tire radial direction from the edge on the outer rim flange 22 side to the tip of the outer rim flange 22 is 2 mm or more and 10 mm or less, and the depth L3 in the tire width direction is set. It is formed to be 30% or more and 80% or less with respect to the thickness T of the bulging portion 15 in the tire width direction.

  In the above configuration, when the tire 10 is assembled to the wheel 20 by the rim, the bead portions 14 of the tire 10 are fitted to the rim flanges 22 and 23 of the wheel 20. As a result, one sidewall portion 12 of the tire 10 is covered by the outer rim flange 22 of the wheel 20, the bulging portion 15 of the sidewall portion 12 abuts on the tip of the outer rim flange 22, and the outer rim flange 22 is The bulging portion 15 protects against contact with a curbstone or the like. At this time, since the bulging portion 15 is provided with a deep groove 15a in the tire width direction, when the bulging portion 15 comes into contact with the outer rim flange 22, the bulging portion 15 is moved in the tire radial direction by the groove 15a. The contact pressure between the bulging portion 15 and the outer rim flange 22 is reduced, and the contact pressure of the shoulder portion 13 is reduced.

  In the tire 10, if the sum of the circumferential lengths of the grooves 15 a is smaller than 60% of the entire circumference, the cushioning effect by the grooves 15 a cannot be sufficiently obtained. Therefore, the sum of the circumferential lengths of the grooves 15 a is 60% or more and 100% or less of the entire circumference is preferable, and 80% or more and 100% or less is optimal. Further, if the width L1 of the groove 15a in the tire radial direction is smaller than 20% with respect to the range A of 30 mm from the front end of the outer rim flange 22 toward the outer side in the tire radial direction, the buffering effect by the groove 15a is sufficiently obtained. If the width L1 is larger than 60%, the protective effect of the outer rim flange 22 is insufficient. Therefore, the width L1 is preferably 20% to 60% of the range A, and more preferably 20% to 60%. . Furthermore, if the height L2 in the tire radial direction from the edge on the outer rim flange 22 side of the groove 15a to the tip of the outer rim flange 22 is less than 2 mm, sufficient rigidity may not be ensured and abrasion may occur. If the height L2 is larger than 10 mm, the rigidity becomes so high that a sufficient buffering effect by the groove 15a cannot be obtained. Therefore, the height L2 is preferably 2 mm or more and 10 mm or less, and most preferably 6 mm or more and 8 mm or less. Further, if the depth L3 of the groove 15a in the tire width direction is smaller than 30% with respect to the thickness T of the bulging portion 15 in the tire width direction, the buffering effect by the groove 15a cannot be sufficiently obtained, and 80% or less. If it is larger, cracks are likely to occur. Therefore, the depth L3 is preferably 30% or more and 80% or less with respect to the thickness T, and most preferably 50% or more and 60%.

  Thus, according to the present embodiment, the bulging portion 15 provided on the side wall portion on the outer rim flange 22 side is connected to the bulging portion 15 by the contact between the bulging portion 15 and the outer rim flange 22. Since the groove 15a to be deformed in the direction is provided, the contact pressure of the shoulder portion 13 can be reduced by the buffering effect of the groove 15a, and the occurrence of uneven wear due to the contact pressure of the shoulder portion 13 becoming higher than the opposite side. It can be effectively prevented.

  In this case, since the total length of the grooves 15a in the tire circumferential direction is 60% or more and 100% or less of the entire circumference, a sufficient buffering effect can be obtained by the grooves 15a, and the contact pressure of the shoulder portion 13 can be reduced. It can be surely reduced.

  Further, the width L1 of the groove 15a in the tire radial direction is set to be 20% or more and 60% or less with respect to the range A of 30 mm from the tip of the outer rim flange 22 toward the outer side in the tire radial direction. The buffering effect by the groove 15a can be sufficiently obtained without impairing the protective effect, which is extremely advantageous for practical use.

  Further, the height L2 in the tire radial direction from the edge on the outer rim flange 22 side of the groove 15a to the tip of the outer rim flange 22 is set to 2 mm or more and 10 mm or less. A sufficient buffering effect can be obtained, which is extremely advantageous for practical use.

  Further, the depth L3 of the groove 15a in the tire width direction is set to be 30% or more and 80% or less with respect to the thickness T of the bulging portion 15 in the tire width direction. A sufficient buffering effect can be obtained, which is extremely advantageous for practical use.

  FIG. 3 shows a second embodiment of the present invention, in which grooves 15b similar to those of the first embodiment are provided at a plurality of locations of the bulging portion 15 at intervals in the tire radial direction. Thereby, even when the rigidity of the bulging portion 15 is high, a sufficient buffering effect can be obtained. FIG. 4 shows a third embodiment of the present invention. A groove 15c similar to that of the first embodiment is inclined so that the depth direction thereof is inclined outward (or inward) in the tire radial direction with respect to the tire width direction. Is provided. In this case, if the inclination angle θ1 of the groove 15c is larger than 45 ° with respect to the tire width direction, the bulging portion 15 may be damaged by the shearing force. Therefore, the inclination angle θ1 is 45 on the outer side or the inner side in the tire radial direction. In consideration of the production and use of the mold, the range of 25 ° or less on the outer side in the tire radial direction and the range of 5 ° or less on the inner side in the tire radial direction are optimal.

  FIG. 5 shows a fourth embodiment of the present invention, in which a groove 15d similar to that of the first embodiment is provided so as to expand outward (or inward) in the tire radial direction with respect to the tire width direction. It is. Thereby, the deformation amount of the bulging part 15 by the groove | channel 15d can be enlarged, and the buffering effect can be heightened. In this case, if the expansion angle θ2 of the groove 15c is larger than 45 ° with respect to the tire width direction, the amount of deformation of the bulging portion 15 may be excessively increased and wear may occur. 45 ° or less is preferable on the outer side or the inner side in the radial direction, and the range of 25 ° or less on the outer side in the tire radial direction and 5 ° or lower on the inner side in the tire radial direction is optimal considering the manufacture and use of the mold.

  FIG. 6 shows a fifth embodiment of the present invention, in which the width in the tire radial direction gradually increases from the opening side toward the bottom side in the depth direction in the same groove 15e as in the first embodiment. Is formed. Thereby, while the deformation | transformation amount of the bulging part 15 can fully be ensured by the bottom part side of the groove | channel 15e, since the opening part side is narrow, the penetration | invasion of a pebble etc. can be prevented effectively.

Partial front sectional view of a pneumatic tire showing a first embodiment of the present invention Principal enlarged sectional view of pneumatic tire The principal part expanded sectional view of the pneumatic tire which shows the 2nd Embodiment of this invention. The principal part expanded sectional view of the pneumatic tire which shows the 3rd Embodiment of this invention. The principal part expanded sectional view of the pneumatic tire which shows 4th Embodiment of this invention The principal part expanded sectional view of the pneumatic tire which shows 5th Embodiment of this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Tire, 15 ... Side wall part, 15 ... Swelling part, 15a, 15b, 15c, 15d, 15e ... Groove, 20 ... Wheel, 22 ... Outer rim flange.

Claims (9)

One rim flange is mounted on a wheel having a height in the tire radial direction larger than that of the other rim flange, and on the side of the rim flange side having a large tire radial direction on the outer side in the tire width direction. In a pneumatic tire in which a bulging portion that bulges is provided in the tire circumferential direction, and the bulging portion is brought into contact with the tip of the rim flange in the tire radial direction,
The pneumatic tire according to claim 1, wherein at least one groove for deforming the bulging portion in a tire radial direction by contact with the rim flange is provided in the bulging portion. 2. The pneumatic tire according to claim 1, wherein the groove of the bulging portion is formed so that a total sum of lengths in the tire circumferential direction is not less than 60% and not more than 100% of the entire circumference. The groove of the bulging portion is formed such that the total width in the tire radial direction is 20% or more and 60% or less with respect to a range of 30 mm from the tip of the rim flange toward the outer side in the tire radial direction. The pneumatic tire according to claim 1 or 2. The groove of the bulging portion is formed so that the height in the tire radial direction from the edge on the rim flange side to the tip of the rim flange is 2 mm or more and 10 mm or less. The described pneumatic tire. The groove of the bulging part is formed so that the depth in the tire width direction is 30% or more and 80% or less with respect to the thickness of the bulging part in the tire width direction. The pneumatic tire according to 2, 3 or 4. The groove of the bulging portion is formed so that the depth direction thereof is inclined at an angle of 45 ° or less to the outer side or the inner side in the tire radial direction with respect to the tire width direction. 4. The pneumatic tire according to 4 or 5. The groove of the bulging portion is formed so as to expand at an angle of 45 ° or less outward or inward in the tire radial direction with respect to the tire width direction. Or the pneumatic tire of 6. The pneumatic tire according to claim 1, 2, 3, 4, 5, 6 or 7, wherein grooves of the bulging portion are provided at a plurality of locations at intervals in the tire radial direction. The groove of the bulging portion is formed so that the width in the tire radial direction gradually increases from the opening side toward the bottom side in the depth direction. 6. A pneumatic tire according to 6, 7, or 8.

Images