JP2009292428A - Pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire that can be stably stacked at any time even if rim protective bars are provided on both side surfaces in a tire width direction. <P>SOLUTION: In rim protective bars 14 and 15 arranged on the both side surfaces in the tire width direction, an inner diameter of a tire width direction outer end portion 14a of the rim protective bar 14 arranged on one side in the tire width direction is larger than an outer diameter of a tire width direction outer end portion 15a of the rim protective bar 15 arranged on the other side in the tire width direction. Hence, when tires 10 are stacked, the rim protective bars 14 and 15 are engaged with each other at the outer/inner positions in a tire radial direction, and the tires are stably stacked. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pneumatic tire used as a radial tire for passenger cars, for example.

  Generally, this type of pneumatic tire includes a tread portion formed on the tire outer peripheral surface side, sidewall portions formed on both sides in the width direction, and a shoulder portion formed between the tread portion and the sidewall portion. And a bead portion formed inside the tire radial direction of the sidewall portion.

In recent flat tires, since the height from the road surface to the rim flange is low, when the tire contacts the curb of the road, the rim flange of the wheel may contact the curb and damage the rim flange. Therefore, a tire having a small flatness ratio is provided with a rim protect bar that protrudes outward in the tire width direction on the sidewall portion, and the rim protect bar prevents contact between the curb stone and the rim flange (for example, Patent Documents). 1).
JP 2003-146026 A

  By the way, when transporting the tire or storing it in a warehouse, a plurality of tires are often stacked in the tire width direction, but when tires provided with the rim protect bar are stacked, the rim protect bars are mutually connected. There was a problem that the contact became unstable and the load collapsed easily.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a pneumatic tire that can always be stably stacked even if rim protection bars are provided on both side surfaces in the tire width direction. It is to provide.

  In order to achieve the above object, the present invention provides a pneumatic tire in which rim protect bars extending annularly in the tire circumferential direction are provided on both side surfaces in the tire width direction, and the rim protect bars are formed so as to protrude outward in the tire width direction. In each of the above, the inner diameter of the outer end portion in the tire width direction of the rim protect bar arranged on one side in the tire width direction is outside the outer end portion in the tire width direction of the rim protect bar arranged on the other side in the tire width direction. It is formed to be larger than the diameter.

  As a result, when stacking tires, the tire width of one rim protect bar is determined by stacking the tire so that the side surface provided with one rim protect bar and the side surface provided with the other rim protect bar face each other. Since the inner diameter of the outer end portion in the direction is larger than the outer diameter of the outer end portion in the tire width direction of the other rim protect bar, the tires are engaged with each other so that the positions of the rim protect bars are shifted to the outer side and the inner side in the tire radial direction. Are stacked.

  In order to achieve the above object, the present invention is provided with rim protect bars extending annularly in the tire circumferential direction on both sides in the tire width direction, and each rim protect bar is formed so as to protrude outward in the tire width direction. In the entering tire, a rim protect bar arranged on one side in the tire width direction is provided with a convex portion extending in the tire circumferential direction, and a rim protect bar arranged on the other side in the tire width direction is provided with a concave portion extending in the tire circumferential direction. ing.

  As a result, when stacking tires, if one side of each tire is provided so that the side surface provided with one rim protection bar and the side surface provided with the other rim protection bar face each other, the convex portion of one rim protection bar And the recesses of the other rim protection bar are engaged with each other and stacked.

  According to the present invention, when the tires are stacked, the rim protect bars can be engaged with each other. Therefore, even if the rim protect bars are provided on both side surfaces in the tire width direction, the tires can always be stably stacked. It is extremely effective in preventing collapse.

  1 to 3 show a first embodiment of the present invention. FIG. 1 is a partial front cross-sectional view of a pneumatic tire, FIG. 2 is an enlarged cross-sectional view of the main part thereof, and FIG. 3 is a stack of pneumatic tires. It is side surface sectional drawing which shows the state.

  The tire 10 shown in the figure includes a tread portion 11 formed on the outer peripheral surface side, sidewall portions 12 formed on both side surfaces in the tire width direction, and bead portions 13 formed on the radially inner side of the sidewall portions 12. And rim protect bars 14 and 15 provided in the respective side wall portions 12, and bead cores 13 a are embedded in the bead portions 13. The tire 10 has a flatness ratio of 55% or less.

  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 and a rim flange 22 provided at an end in the width direction of the wheel main body 21. A rim 23 is formed inward in the width direction.

  Each of the rim protect bars 14 and 15 of the tire 10 is made of rubber having a substantially triangular cross section that protrudes outward in the tire width direction, and is formed to extend annularly in the tire circumferential direction. In this case, each of the rim protect bars 14 and 15 has an inner diameter Ra of the tire width direction outer end portion 14a of the rim protect bar 14 disposed on one side in the tire width direction, and the rim protect bar 15 disposed on the other side in the tire width direction. It is formed so as to be larger than the outer diameter Rb of the outer end 15a in the tire width direction, and is formed so that a difference (Ra-Rb) between the inner diameter Ra and the outer diameter Rb is 5 mm or more and 20 mm or less. . Each rim protect bar 14, 15 has an inner end 14 b in the tire radial direction of one rim protect bar 14 that is 0 mm from the outer end 15 b in the tire radial direction of the other rim protect bar 15 toward the inner side in the tire radial direction. It is formed so as to be located within the range of 10 mm or less. That is, the height in the tire radial direction from the bead toe 13b to the tire radial inner end 14b of one rim protect bar 14 is Ha, and the height from the bead toe 13b to the tire radial inner end 15b of the other rim protect bar 15 is set. Assuming that the height in the tire radial direction is Hb, each rim protect bar 14, 15 is formed such that Ha-Hb is not less than -10 mm and not more than 0 mm. Further, the outer peripheral surfaces of the rim protect bars 14 and 15 (surfaces extending from the tire width direction outer end portions 14a and 15a toward the sidewall portion 12) are formed in a gently curved shape having a concave shape toward the inner side. However, it may be formed linearly.

  When the tires 10 configured as described above are stacked in the tire width direction, as shown in FIG. 3, the side surface of each tire 10 provided with one rim protect bar 14 and the other rim protect bar 15 are provided. It is piled up so that the specified side faces. At this time, since the inner diameter Ra of one rim protect bar 14 is larger than the outer diameter Rb of the other rim protect bar 15, the rim protect bars 14 and 15 are positioned on the outer side and the inner side in the tire radial direction. They are meshed so as to be displaced and stacked.

  As described above, according to the tire 10 of the present embodiment, the rim protect bars 14 and 15 provided on both side surfaces in the tire width direction have the outer end 14a in the tire width direction of the rim protect bar 14 disposed on one side in the tire width direction. Since the inner diameter Ra of the rim protect bar 15 disposed on the other side in the tire width direction is formed to be larger than the outer diameter Rb of the tire width direction outer end 15a, each rim protect bar 14, 15 can be engaged with each other so that the positions thereof are shifted to the outer side and the inner side in the tire radial direction, and can always be stacked stably. Therefore, unlike the case where the rim protect bars on both sides in the tire width direction are provided at the same position in the tire radial direction, the rim protect bars do not interfere with each other and stack unstably, which is extremely effective in preventing load collapse. Is. Further, since the tire radial direction positions of the rim protect bars 14 and 15 are different on both side surfaces in the tire width direction, for example, when the mounting direction to the vehicle is specified like a tire having an asymmetric pattern, the left and right mounting The direction can be easily determined.

  Further, each rim protect bar 14, 15 is formed so that the difference between the inner diameter Ra and the outer diameter Rb is not less than 5 mm and not more than 20 mm. Therefore, the difference between the inner diameter Ra and the outer diameter Rb is too small. 14 and 15 do not become difficult to mesh with each other, and there is an advantage that the difference between the inner diameter Ra and the outer diameter Rb is too large and the effect of preventing the collapse of the load does not decrease. Further, there is an advantage that one of the rim protect bars 14 is not too far from the rim flange 22 to deteriorate the protection function of the rim flange 22.

  Furthermore, each rim protect bar 14, 15 has an inner end 14 b in the tire radial direction of one rim protect bar 14 of 0 mm from the outer end 15 b in the tire radial direction of the other rim protect bar 15 toward the inner side in the tire radial direction. Since it is formed so as to be within the range of 10 mm or less, there is a gap between the tire radial direction inner end portion 14b of one rim protect bar 14 and the tire radial direction outer end portion 15b of the other rim protect bar 15. Since the rim protect bars 14 and 15 do not overlap more than necessary, the rim protect bars 14 and 15 can be reliably engaged with each other.

  In addition, since the tire 10 of the present embodiment has a flatness ratio of 55% or less, the tire 10 is highly necessary for the rim protect bars 14 and 15, and is extremely effective when the present invention is used.

  4 to 6 show a second embodiment of the present invention. FIG. 4 is a partial front cross-sectional view of a pneumatic tire, FIG. 5 is an enlarged cross-sectional view of an essential part thereof, and FIG. 6 is a stack of pneumatic tires. It is side surface sectional drawing which shows the state. In addition, the same code | symbol is attached | subjected and shown to a structure equivalent to the said embodiment.

  The tire 10 of the present embodiment has rim protect bars 16 and 17 at the same position in the tire radial direction of the respective sidewall portions 12, and one rim protect bar 16 has a convex portion 16a protruding outward in the tire width direction. The other rim protect bar 17 is provided with a concave portion 17a having a concave shape on the inner side in the tire width direction.

  The convex portion 16a and the concave portion 17a are formed in a triangular cross section, and are formed so as to extend annularly in the tire circumferential direction. The rim protect bars 16, 17 are formed such that the tire width direction outer end portion 16b of the convex portion 16a and the tire width direction inner end portion 17b of the concave portion 17a are at the same position in the tire radial direction. . That is, the height in the tire radial direction from the bead toe 13b to the outer end portion 16b in the tire width direction of one rim protect bar 16 is La, and the distance from the bead toe 13b to the inner end portion 15b in the tire width direction of the other rim protect bar 17 is set. When the height in the tire radial direction is Lb, the rim protect bars 16 and 17 are formed so that La = Lb. Further, the convex portion 16a and the concave portion 17a have a height Da in the tire width direction of the convex portion 16a that is larger than a depth Db in the tire width direction of the concave portion 17a, and a width Wa in the tire radial direction of the convex portion 16a. It is formed to be smaller than the width Wb in the tire radial direction.

  When the tires 10 of this embodiment are stacked in the tire width direction, the side surface provided with one rim protect bar 16 and the side surface provided with the other rim protect bar 17 face each other as shown in FIG. Stack up like so. At this time, the convex portion 16a of one rim protect bar 16 and the concave portion 17a of the other rim protect bar 17 are engaged with each other and stacked.

  As described above, according to the tire 10 of the present embodiment, the one rim protect bar 16 is provided with the convex portion 16a extending annularly in the tire circumferential direction, and the other rim protect bar 17 is the concave portion extending annularly in the tire circumferential direction. Since 17a is provided, when the tires 10 are stacked, the convex portions 16a and the concave portions 17a of the rim protect bars 16, 17 can be engaged with each other, so that the tires 10 can always be stacked stably. In addition, since the shape of the convex portion 16a and the concave portion 17a is different on both side surfaces in the tire width direction, as in the above-described embodiment, when the mounting direction to the vehicle is specified like a tire having an asymmetric pattern, The mounting direction can be easily determined.

  In this case, the rim protect bars 16 and 17 are formed such that the tire width direction outer end portion 16b of the convex portion 16a and the tire width direction inner end portion 17b of the concave portion 17a are at the same position in the tire radial direction. The convex portion 16a and the concave portion 17a can always be meshed at the same position in the tire radial direction, and the stability when stacked can be further improved.

  Further, in the convex portion 16a and the concave portion 17a, the height Da of the convex portion 16a in the tire width direction is larger than the depth Db of the concave portion 17a in the tire width direction, and the width Wa of the convex portion 16a in the tire radial direction is the height of the concave portion 17a. Since it formed so that it might become smaller than the width Wb of a tire radial direction, it becomes easy to mesh | engage the convex part 16a and the recessed part 17a, and a stacking operation | work can be performed easily.

  In the first and second embodiments, the rim protect bars 14, 15, 16, and 17 having a substantially triangular cross section are shown. However, the rim protect bars may have a substantially trapezoidal cross section.

  As shown in FIG. 7, when Examples 1 to 3 of the present invention, the conventional example, and the comparative example were evaluated for stability when tires were stacked, the following results were obtained. Here, a tire that is not mounted on a wheel and has a tire size of 205 / 45R17 was used. In the conventional example, a rim protect bar is provided symmetrically, and the corresponding Ra-Rb is zero and Ha-Hb is -19 mm in the first embodiment. Further, a comparative example having no rim protect bar was used. Furthermore, in Example 1, Ra-Rb in the first embodiment is 50 mm and Ha-Hb is 25 mm, and in Example 2, Ra-Rb is 10 mm and Ha-Hb is 5 mm. A thing was used. Further, in Example 3, as in the second embodiment, the left and right rim protect bars arranged at the same position in the tire radial direction are provided with convex portions and concave portions, and the corresponding Ra- in the first embodiment. Rb was zero and Ha-Hb was -19 mm.

  In this evaluation test, four tires are stacked on a transport truck and moved 50 meters, one point is the one that caused the load collapse, and three points are the ones that are unstable but not unstable. It was evaluated that it was superior if the total score repeated 10 times was higher, with 5 points being stable. As a result of the test, each of Examples 1 to 3 has a higher total score than the conventional example and the comparative example, Example 2 has a higher total score than Example 1, and Example 3 has a higher total score than Example 2. The result was high.

The partial front sectional view of the pneumatic tire which shows the 1st embodiment of the present invention. Principal enlarged sectional view of pneumatic tire Side sectional view showing a state in which pneumatic tires are stacked Partial front sectional view of a pneumatic tire showing a second embodiment of the present invention Principal enlarged sectional view of pneumatic tire Side sectional view showing a state in which pneumatic tires are stacked The figure which shows the result of the evaluation test

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Tire, 14, 15 ... Rim protect bar, 16 ... Rim protect bar, 16a ... Convex part, 17 ... Rim protect bar, 17a ... Concave part.

Claims (7)

In the pneumatic tire formed with rim protect bars extending annularly in the tire circumferential direction on both side surfaces in the tire width direction, each rim protect bar projecting outward in the tire width direction,
Each rim protect bar has an inner diameter at the outer end portion in the tire width direction of the rim protect bar arranged at one side in the tire width direction from an outer diameter at the outer end portion in the tire width direction at the other end in the tire width direction. A pneumatic tire characterized by being formed to be larger. Each rim protect bar is formed such that the difference between the inner diameter of the rim protect bar arranged on one side in the tire width direction and the outer diameter of the rim protect bar arranged on the other side in the tire width direction is 5 mm or more and 20 mm or less. The pneumatic tire according to claim 1. Each rim protect bar is arranged at one end in the tire width direction of the rim protect bar. The inner end in the tire radial direction of the rim protect bar is located at the inner side in the tire radial direction from the outer end of the rim protect bar in the tire width direction. The pneumatic tire according to claim 1 or 2, wherein the pneumatic tire is formed so as to be located within a range of 0 mm or more and 10 mm or less. In the pneumatic tire formed with rim protect bars extending annularly in the tire circumferential direction on both side surfaces in the tire width direction, each rim protect bar projecting outward in the tire width direction,
A rim protect bar disposed on one side in the tire width direction is provided with a convex portion extending in the tire circumferential direction, and a rim protect bar disposed on the other side in the tire width direction is provided with a concave portion extending in the tire circumferential direction. And pneumatic tires. The said convex part and the recessed part were formed so that the tire width direction outer side edge part of a convex part and the tire width direction inner side edge part of a recessed part might mutually become the same position of a tire radial direction. Pneumatic tire. The height of the convex portion and the concave portion in the tire width direction of the convex portion is larger than the depth of the concave portion in the tire width direction, and the width of the convex portion in the tire radial direction is smaller than the width of the concave portion in the tire radial direction. The pneumatic tire according to claim 4 or 5, wherein the pneumatic tire is formed. The pneumatic tire according to claim 1, 2, 3, 4, 5 or 6, wherein the tire flatness is 55% or less.

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