JP4633946B2 - Run-flat tire and rim assembly - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a run-flat tire and a combination of a rim and a rim that are used in combination with a core and a stopper, among run-flat tires that can be used for safe driving without causing rim disengagement even during an abnormal drop in air pressure such as puncture. It relates to solids.
[0002]
[Prior art]
So-called parent-child double partition tires (hereinafter referred to as parent-child tires) have been generally disclosed in the art for a long time. This is a combined structure in which an independent child tire that defines a cavity smaller than this is provided in the cavity of the parent tire. This parent and child tire seems to be useful at first glance for preventing the parent tire from coming off due to the action of the child tire at the time of an abnormal decrease in air pressure such as puncture. However, there is a possibility that the piercing needle penetrating the parent tire may penetrate the child tire, and manufacturing the child tire requires the same amount of labor and man-hours as the parent tire. In addition, since there are parent and child tires, problems such as weight increase and the trouble of wearing / removing to / from the rim are correct, and even after more than 40 years from the proposal, they have not yet been widely used.
[0003]
Japanese Patent Publication No. 59-25682 (first conventional example) is also disclosed. This is to provide a set of cores in the tire. That is, in this configuration, as shown in FIG. 5, the radial support element 121 is provided on the outer diameter side of the device 123 that fixes the support body 102 (core) to the rim 110. Further, a flexible crown 224 including an extension 221 extending in the lateral direction from the radial element 121 and a protrusion 225 that is integrated on the radially outer side are provided.
[0004]
Japanese Unexamined Patent Publication No. 64-74106 (second conventional example) is also disclosed. As shown in FIG. 6, this is also a system in which a core is arranged in the tire, as in the first conventional example. That is, one base body 204 as a core is disposed in the tire.
[0005]
[Problems to be solved by the invention]
However, in the first conventional example, the operation of the protrusion 225 with respect to the one side portion 111 can be easily understood, but the displacement of the other side portion (not shown) is uncertain and the puncture resistance function is uneasy. . Moreover, not only is the structure of the entire core complicated, but there is also a concern that the weight will be heavy.
[0006]
Further, in the second conventional example, the fixing between the base body 204 and the rim 203 cannot always be determined only from the expression in the specification that the fitting portion 222 of the base body 204 is fitted to the rim well 217. In addition, since the base body 204 has a structure that supports the center portion of the crown of the tire when the internal pressure of the tire decreases, the base body 204 (core) becomes large, and there is a concern about the stability of the arrangement against the centrifugal force during tire rotation. Not only that, but also the tire weight is worried. In addition, due to the deformation of the tire crown portion that accompanies the running use of the tire, intermittent pressing contact and sliding always occur between the inner circumferential surface of the crown portion and the base body 204. For this reason, there is a possibility that this part is overheated and damaged, and this causes a decrease in durability.
[0007]
The present invention is a run-flat tire that is lighter than the above conventional example, is easy and reliable to be attached to a tire or rim, has a function to prevent rim detachment of the tire bead portion, and does not cause a problem in tire durability. An assembly of a rim and a rim is provided.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, an assembly of a tire and a rim having a pair of side portions extending radially outward from the pair of bead portions and a crown portion bridging between the side portions. And, on the inner diameter side of the tire lumen, a pair of run flat members made of an elastic material are provided on the rim so as to correspond to both bead portions, and a rigid stopper is provided between the two run flat members , The rim is formed with a convex portion at a position where the run flat member is provided, and the run flat member is formed with a concave portion that fits the convex portion .
[0009]
Accordingly, since the run flat members are arranged on both the left and right sides, the central portion of the tire lumen is in a hollow state. For this reason, the run-flat member only occupies a small volume in the tire, and the entire tire is lightweight. Further, since the run-flat members are arranged in a pair of left and right, the behaviors of the left and right side portions are almost the same, and the running stability is excellent. In addition, when the internal pressure of the tire is reduced and the tire is deformed, the stopper prevents the run flat member from moving toward the center of the rim. For this reason, the tire bead portion does not move in the rim removal direction, and the tire is supported by the run-flat member and can travel.
[0010]
In the second aspect of the present invention, in the first aspect, the height of the run flat member is substantially half the height of the tire.
For this reason, unlike the above-described conventional configuration, it is possible to reliably avoid the constant contact and sliding between the top portion of the run-flat member and the inner peripheral surface of the tire, and the tire has excellent durability.
[0011]
According to a third aspect of the present invention, in the first or second aspect, the side surface of the run flat member has a plurality of groove-shaped portions extending in the tire circumferential direction.
[0012]
Therefore, by providing a plurality of groove-like portions, the run-flat member itself is lightweight, and the run-flat member is easily deformed by the action of the groove-like portions, effectively absorbing the deformation energy of the tire when the tire is decompressed. And good running stability can be obtained. According to a fourth aspect of the present invention, in the third aspect, the groove portions are formed on both side surfaces of the run flat member, and the groove portions on the both side surfaces are alternately arranged. It is a thing.
[0013]
Therefore, when a load in the vertical direction is applied to the run-flat member via the tire crown when the tire internal pressure is reduced, the deformation of the tire is absorbed by the deformation of the groove-like portion, and the tire is unstable. Can be suppressed.
[0014]
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the outer diameter surface of the run flat member is formed into a bulging curved surface.
Therefore, compared with the case where the outer diameter surface of the run-flat member is planar, stress tends to concentrate on the outer diameter surface. For this reason, the run-flat member is easily deformed and can sufficiently absorb the deformation energy of the tire.
[0015]
According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the outer diameter surface is formed such that a portion of about one third from the side portion side of the tire has a maximum diameter with respect to the entire width of the run flat member. It is a feature.
[0016]
Therefore, the maximum diameter portion of the outer diameter surface is positioned closer to the side portion, and both side portions are likely to fall outward when the internal pressure of the tire is reduced. For this reason, the unstable behavior of the tire when the internal pressure is reduced can be suppressed.
[0017]
The invention according to claim 7 is characterized in that, in any one of claims 3 to 5, the cross-sectional shape of the groove-like portion is a tapered shape extending outward.
Therefore, the run-flat member is easily deformed in the direction in which the groove-shaped portion is closed, and the unstable behavior is effectively suppressed.
[0018]
According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the rim is a two-part rim.
Therefore, the rim assembly of the run flat tire and the rim becomes easier.
[0019]
In the ninth aspect of the present invention, in any one of the first to eighth aspects, the rigid stopper is provided with an inner peripheral surface having a shape and size that matches the shape and size of the outer peripheral surface of the two-part rim. And it is characterized by being fixed and integrated with the two-part rim.
[0020]
Accordingly, the stopper is securely seated on the rim, and as a result, the rim can be reliably prevented from coming off the tire.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, an embodiment of a run-flat tire and rim assembly embodying the present invention will be described with reference to FIGS.
[0022]
In this embodiment, an assembly 31 of a rim 40 and a pneumatic tire 41 having a pair of side portions 33 extending radially outward from the pair of bead portions 32 and a crown portion 34 that bridges the side portions 33. It is. The rim 40 is a two-split rim composed of two split pieces 40b and 40c for assembling the tire. As shown in FIG. 1, a seal material 44 is provided on the split surface to prevent vibration, soundproof and air leakage. Filled. Further, around the bolt 45 for fixing the divided pieces 40b and 40c to each other, seal rings 42 and 43 for preventing air leakage are integrally formed on the divided pieces 40b and 40c. And the rim | limb 40 is one body except the tire assembly | attachment part (outer peripheral part), its intensity | strength is high and it is excellent in safety | security.
[0023]
The run flat members 36 made of an elastic material are disposed on both sides of the rim 40 on the inner side of the bead in the tire lumen so as to correspond to the both bead portions 32, and the height thereof is (in the radial direction of the tire). Dimensions) Almost half of the tire 41. The run flat member 36 is seated on the outer periphery of the rim 40. The rim 40 has a convex portion 40a, and both the run flat members 36 are formed with a concave portion 37d that matches the convex portion 40a, and the seating of both the run flat members 36 is stabilized by the fitting of both the 40a and 37d. Retained.
[0024]
The side surface 36 a where the run flat member 36 faces the side portion 33 of the tire is in contact with the tire bead portion 32 at a rim side portion that is approximately ½ of the height. In addition, tapered groove-shaped portions 37a that extend outward toward the center of the run-flat member 36 are provided at a plurality of locations with a gap in the radial direction from the side surface 36a. On the side surface 36b opposite to the side surface 36a of the run flat member 36, tapered groove portions 37b extending outward toward the central portion of the run flat member 36 are provided at a plurality of positions with gaps in the radial direction. It has been. As shown in FIG. 3, these tapered groove portions 37a and 37b extend in the tire circumferential direction.
[0025]
The relative positions of both groove-like portions 37a and 37b are staggered. The depths of the groove-shaped portions 37a and 37b slightly exceed the entire width of the run-flat member 36, that is, the center line of the thickness between the side surfaces 36a and 36b. The grooves of the groove-shaped portions 37a and 37b The bottom is nested. The cross-sectional areas of the groove portions 37a and 37b are 37a> 37b, and the ratio is about 3 times.
[0026]
On the outer diameter surface 36c of the run flat member 36, circular recesses 39 are arranged in the circumferential direction at equal intervals. Further, the outer diameter surface 36c is formed in a swollen curved surface shape except for the concave portion 39, and is almost the entire width of the run flat member 36, that is, the distance between the opposite side surfaces 36a and 36b from the tire side portion 33 side. The portion corresponding to one third is formed in the maximum diameter. Note that the curvature of the outer diameter surface 36c continuously changes. The concave portion 39 further ensures that the side portion 33 is deformed outward due to the difference in volume between the groove-like portions 37a and 37b and the deviation of the maximum diameter position of 36c toward the side portion 33 when the tire internal pressure is reduced. Yes. Further, as shown in FIGS. 1 and 3, the run-flat member 36 is provided with a plurality of groove portions 37c at equal intervals along the circumferential direction thereof.
[0027]
A stopper 38 made of a metal rigid body is seated on the outer periphery of the rim 40 between the two run flat members 36. The stopper 38 is formed such that the shape and size on the inner peripheral side of the outer peripheral surface thereof are adapted to the rim 40. The width between the flange portions 38 a formed by bending on both sides of the stopper 38 is a dimension at which the flange portion 38 a substantially contacts the run flat member 36. Although not shown, the stopper 38 is fixed and integrated with the rim 40 by an appropriate method such as spot welding.
[0028]
In this embodiment, when the internal pressure of the tire 41 decreases due to puncture or the like, as shown in FIG. 2, the tire 41 is deformed by a force in a direction perpendicular to the tire 41 (the vertical direction in FIGS. 1 and 2). . In this case, since the stopper 38 is provided on the rim 40 in the inner cavity of the tire 41 via the run flat member 36, the bead portion 32 does not move in the rim removal direction, and the side portion 33 is inward. It will not bend toward you.
[0029]
The run flat member 36 is deformed in a direction in which the groove portions 37a and 37b are closed, and carries the load. For this reason, it is possible to prevent the tire 41 from becoming extremely flat and to travel at a certain speed.
[0030]
Therefore, in this embodiment, the following effects are exhibited.
(1) In the lumen of the tire 41, a pair of run flat members 36 made of an elastic material are provided corresponding to both bead portions 32, respectively. For this reason, the run flat member 36 is disposed so as to correspond to the side portion 33 in both the left and right lumens of the tire 41. Accordingly, the central portion of the inner cavity of the tire 41 is hollow, and the run flat member 36 only occupies a small volume in the tire 41. As a result, the tire 41 can be reduced in weight. Moreover, since the run flat member 36 is a pair of left and right arrangements, the behavior of the left and right side portions 33 is almost the same, and the running stability is excellent.
[0031]
(2) Since the run flat member 36 is not set to a height that always contacts the inner peripheral surface of the crown portion of the tire, heat generation or damage based on contact or sliding between the run flat member 36 and the tire Can be prevented. For this reason, high durability can be ensured.
[0032]
(3) The run flat member 36 is prevented from being displaced from the bead portion by the rigid stopper 38. For this reason, the run-flat member 36 can be held in contact with the tire side portion 33, the unstable behavior of the tire side portion 33 can be suppressed, the rim of the tire 41 can be prevented from being removed, and good running stability can be achieved. Can be obtained.
[0033]
(4) Since the plurality of groove-like portions 37a and 37b extending in the tire circumferential direction are provided on the side surface of the run flat member 36, the weight can be reduced. In addition, the run-flat member 36 is easily deformed by the action of the groove-shaped portions 37a and 37b, the deformation energy of the tire when the tire is decompressed can be effectively absorbed, and good running stability can be obtained.
[0034]
(5) The groove portions 37a and 37b are formed on both side surfaces of the run flat member 36, and the groove portions on both side surfaces 36a and 36b are alternately arranged. For this reason, when a load in the vertical direction is applied to the run-flat member 36 through the tire crown portion when the tire internal pressure is reduced, the groove-shaped portions 37a and 37b are easily deformed in a narrowing direction, and the deformation energy of the tire is effective. It is absorbed by the tire, and the unstable behavior of the tire can be suppressed, and stable running can be obtained.
[0035]
(6) The outer diameter surface 36c of the run flat member 36 is formed in a curved surface. For this reason, compared with the case where the outer diameter surface of the run flat member 36 is planar, there is a synergy between the volume difference between the groove portions 37a and 37b and the deviation of the maximum diameter position of 36c toward the tire side portion 33. As a result, the run flat member 36 brings an effect of deforming the tire side portion 33 to the outside, so that more stable running is possible.
[0036]
(7) Since the cross-sectional shape of the groove-shaped portions 37a and 37b is tapered outward and the cross-sectional area is 37a> 37b, the groove-shaped portion 37a is closed on the entire surface, 37b is closed on the inside, and the outer side is open. The run flat member 36 is easily deformed in the direction, and the unstable behavior is effectively suppressed.
(Another embodiment)
The present invention can also be embodied as follows.
[0037]
A groove-like portion of the run flat member 36 is provided on one side surface 36 a of the member 36.
-Change the number of groove-shaped parts 37a, 37b of the run-flat member 36.
[0038]
-As shown in FIG. 4, the seal rings 42 and 43 in the said embodiment are abbreviate | omitted. Even in this case, air leakage can be prevented by the sealing material 44.
[0039]
【The invention's effect】
As described above in the embodiment, in the present invention, a pair of run flat members whose height is about ½ of the tire height are provided on the inner diameter side of the tire lumen, and a rigid body is provided between the members. A stopper was placed. As a result, the weight of the tire can be reduced, the bead portion can be completely prevented from coming off the rim, and the behavior of the left and right side portions can be made substantially the same, enabling stable running.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment.
FIG. 2 is a cross-sectional view also showing when the internal pressure is lowered.
FIG. 3 is a partial perspective view of the run-flat member.
FIG. 4 is a partially enlarged cross-sectional view showing another embodiment.
FIG. 5 is a cross-sectional view showing a first conventional example.
FIG. 6 is a cross-sectional view showing a second conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 31 ... Assembly, 32 ... Bead part, 33 ... Side part, 35 ... Connection part, 36 ... Run flat member, 36a ... Side surface, 36b ... Side surface, 36c ... Outer diameter surface, 37a ... Groove-shaped part. 37b ... groove-like portion, 38 ... stopper, 40 ... rim, 41 ... tire.

Claims (9)

An assembly of a rim and a tire having a pair of side portions extending radially outward from a pair of bead portions and a crown portion that bridges between the side portions,
On the inner diameter side of the tire lumen, a pair of run flat members made of an elastic material are provided on the rim so as to correspond to both bead parts, and a rigid stopper is provided between the two run flat members ,
The rim has a convex portion at a position where the run flat member is provided, and the run flat member has a concave portion that fits the convex portion. Solid. The run-flat tire / rim assembly according to claim 1, wherein the height of the run-flat member is substantially half of the height of the tire. The run-flat tire and rim assembly according to claim 1 or 2, wherein the run-flat member has a plurality of groove-shaped portions extending in a tire circumferential direction on a side surface thereof. 4. The set of run-flat tires and rims according to claim 3, wherein the groove-shaped portions are formed on both side surfaces of the run-flat member, and the groove-shaped portions on both side surfaces are alternately arranged. Solid. The run-flat tire and rim assembly according to any one of claims 1 to 4, wherein an outer diameter surface of the run-flat member is formed in a bulging curved shape. 6. The outer diameter surface according to any one of claims 1 to 5, wherein the outer diameter surface is formed to have a maximum diameter of about ほ ぼ from the side portion of the opposing tire with respect to the entire width of the run flat member. An assembly of the described run-flat tire and rim. The run-flat tire and rim assembly according to any one of claims 3 to 5, wherein the cross-sectional shape of the groove-like portion is a tapered shape spreading outward. The run-flat tire / rim assembly according to claim 1, wherein the rim is a two-part rim. The rigid stopper is provided with an inner peripheral surface having a shape and size suitable for the shape and size of the outer peripheral surface of the two-part rim, and is fixed and integrated with the two-part rim. Item 9. The run-flat tire / rim assembly according to any one of Items 1 to 8.

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