JP2012041001A - Tire guard, wheel, and tire-wheel assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire guard that prevents damage to a tire side part.SOLUTION: The tire guard 24 is mounted on a wheel 22. A guard part 32 of annular form is arranged spaced apart at an interval on the outside in the tire width direction of a side part 14 on the outside in the vehicle width direction of a pneumatic tire 10 when the pneumatic tire is mounted on a vehicle. When the vehicle is made to travel, for example, it is configured to allow the curbstone or the like to contact with the guard part 32 in order to prevent the curbstone or the like from directly contacting with the side part 14, thereby preventing a side cut of the pneumatic tire 10. When the vehicle climbs over the curbstone or the like, it is configured to allow the curbstone or the like to contact with the outer-peripheral part of the guard part 32 in order to prevent large impact from acting on the pneumatic tire 10, thereby preventing a pinch cut.

Description

  The present invention relates to a tire guard, a wheel, and a tire / wheel assembly capable of preventing damage to a side portion of a pneumatic tire.

  In recent years, studies have been made to reduce tire members and gauges in order to save resources, reduce rolling resistance, improve costs, and the like (for example, see Patent Document 1).

JP 2009-1228 A

Among them, especially when trying to reduce the gauge of the side part, simplify the carcass ply structure, reduce the weight of the tire side part, etc., the side cut and pinch cuts will always be problems. Become.
Although it is conceivable that the tire is made of a material having strength that does not cause side cuts and rigidity that is not pinched when overhanging the protrusion, it has a great influence on other performance such as riding comfort.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wheel and a tire / wheel assembly capable of preventing side portion damage such as side cut and pinch cut.

  The tire guard according to claim 1 is provided with a guard portion that is disposed on the outer side in the tire width direction of the pneumatic tire so as to be separated from the pneumatic tire as a whole, and the guard portion is a wheel for assembling the pneumatic tire. A mounting portion for mounting is provided.

Next, the operation of the tire guard according to claim 1 will be described.
The tire guard according to claim 1 includes an attachment portion for attachment to the wheel, and by attaching the attachment portion to the wheel, the guard portion is disposed on the outer side in the vehicle width direction when the pneumatic tire is mounted on the vehicle, for example. Can be arranged.

  For example, by arranging the guard part on the outer side in the vehicle width direction when the pneumatic tire is mounted on the vehicle, for example, the curb or the projection on the road surface comes into contact with the guard part and the curb or the projection on the road surface is in the air. Direct contact with the side portion of the entering tire can be prevented, thereby preventing side cut of the pneumatic tire.

  In addition, the impact when strongly climbing over curbs or large protrusions on the road surface may cause pinch cuts (plastic deformation of the side parts) in the side parts of the pneumatic tire. A pinch cut can be prevented by contacting a part of the load and bearing a part of the load to reduce the impact on the pneumatic tire.

When the pneumatic tire and the guard portion are brought into contact with each other, the portion of the pneumatic tire that is in contact with the guard portion is worn out. Therefore, it is necessary to arrange the guard portion so as to be separated from the pneumatic tire as a whole.
The tire guard may be disposed on the inner side in the vehicle width direction (that is, the vehicle side of the pneumatic tire) when the pneumatic tire is mounted on the vehicle.

  According to a second aspect of the present invention, in the tire guard according to the first aspect, when the attachment portion is attached to the wheel to which the pneumatic tire is attached, the guard portion has an internal pressure described in a tire standard. The air pressure corresponding to the maximum load of the single wheel in the applied size is applied, and when the maximum load of the single wheel in the applied size described in the tire standard is applied, the pneumatic tire does not contact.

Next, the operation of the tire guard according to claim 2 will be described.
When a load is applied to the pneumatic tire, the tire side portion immediately below the load bulges outward in the tire width direction, and the bulged portion of the tire side portion contacts the guard portion.
The tire guard according to claim 2 is applied to the pneumatic tire mounted on the wheel, the internal pressure being the air pressure corresponding to the maximum load of the single wheel in the application size described in the tire standard. When the maximum load of a single wheel in size is applied, it is attached to the wheel so that the pneumatic tire and the guard part do not contact, so that the guard part does not contact the tire side part of the pneumatic tire during normal driving The generation of abnormal noise and the wear of the tire side portion can be prevented.
The standard is determined by an industrial standard that is effective in the region where the tire is produced or used. For example, in Japan, it is “Year Book” of JATMA (Japan Automobile Tire Association), “Year Book of The Tire and Rim Association Inc.” in the United States, and “Standards Manual of The European Tire and Rim Technical Organization” in Europe.

  According to a third aspect of the present invention, in the tire guard according to the first or second aspect, when the attachment portion is attached to the wheel on which the pneumatic tire is attached, the guard portion applies an internal pressure to the tire guard. Air pressure corresponding to the maximum load of a single wheel in the applicable size described in the standard, and when the maximum load of a single wheel in the applicable size described in the tire standard is applied, the outer periphery does not touch the road surface. The diameter is set.

Next, the operation of the tire guard according to claim 3 will be described.
Since the guard portion may cause abnormal noise when coming into contact with the road surface, the guard portion preferably has an outer diameter smaller than the outer diameter of the pneumatic tire so as not to contact the road surface during normal traveling.
The tire guard uses the internal pressure of the pneumatic tire mounted on the wheel as the air pressure corresponding to the maximum load of the single wheel described in the tire standard, and applies the maximum load of the single wheel in the applicable size described in the tire standard. Since the outer periphery of the guard part is set to an outer diameter that does not contact the road surface during normal driving, the outer periphery of the guard part can be kept out of contact with the road surface during normal driving, noise generation, and wear of the guard part Can be prevented.

  According to a fourth aspect of the present invention, in the tire guard according to any one of the first to third aspects, an elastic body that is softer than the guard portion is attached to an outer peripheral portion of the guard portion.

Next, the operation of the tire guard according to claim 4 will be described.
When the curbstone is overcome, the elastic body that is softer than the guard part contacts the curbstone, so that the impact acting on the guard part from the curbstone is absorbed and damage to the guard part can be prevented.

In addition, when the internal pressure of the pneumatic tire decreases due to puncture, etc., the pneumatic tire will be crushed by the load, but even if the pneumatic tire is crushed, the elastic body attached to the outer periphery of the guard part should be in contact with the road surface Is possible.
Since the elastic body softer than the guard portion is in contact with the road surface, the impact acting on the guard portion from the road surface is absorbed, and damage to the guard portion can be prevented.

  According to a fifth aspect of the present invention, in the tire guard according to any one of the first to fourth aspects, a plurality of holes are formed in the guard portion along a circumferential direction.

Next, the operation of the tire guard according to claim 5 will be described.
Since a plurality of holes are formed in the guard portion along the circumferential direction, the air between the guard portion and the side portion of the pneumatic tire is caused to flow outside the guard portion in the tire width direction through the plurality of holes in the guard portion. The air outside the tire width direction of the guard portion can be discharged between the side portions of the pneumatic tire and the heat of the side portions can be easily radiated.

  The wheel according to claim 6 is provided with the tire guard according to any one of claims 1 to 5.

Next, the operation of the wheel according to the sixth aspect will be described.
Since the wheel according to claim 6 has the tire guard according to any one of claims 1 to 6 attached thereto, when a pneumatic tire is attached to the wheel, the tire width direction of the pneumatic tire A guard part is arrange | positioned on the outer side, and damage to side parts, such as a side cut of a pneumatic tire, and a pinch cut, can be prevented similarly to Claims 1-6.

  According to a seventh aspect of the present invention, there is provided a tire / wheel assembly in which a pneumatic tire is assembled to a wheel to which the tire guard according to any one of the first to fifth aspects is attached.

Next, the operation of the tire / wheel assembly according to the seventh aspect will be described.
In the tire / wheel assembly according to claim 7, the tire guard according to any one of claims 1 to 6 is attached to the wheel, and the guard portion is provided on the outer side in the tire width direction of the pneumatic tire. Since they are arranged, similarly to the first to sixth aspects, it is possible to prevent damage to the side portions such as the side cut and the pinch cut of the pneumatic tire.

  The tire guard according to claim 1 has an excellent effect that damage to the tire side portion can be prevented regardless of the type of the pneumatic tire. For this reason, the merit which a pneumatic tire has can be utilized, and the freedom degree of design of a pneumatic tire can also be increased.

  According to the tire guard of the second aspect, it is possible to prevent generation of abnormal noise and wear of the tire side portion.

  According to the tire guard of the third aspect, it is possible to prevent generation of abnormal noise and wear of the guard portion.

  According to the tire guard of the fourth aspect, it is possible to prevent the guard part from being damaged when traveling by the guard part.

  According to the tire guard of the fifth aspect, the heat of the side portion of the pneumatic tire can be easily radiated.

  According to the wheel of the sixth aspect, the side cut and the pinch cut of the pneumatic tire can be prevented similarly to the first to sixth aspects.

  According to the tire / wheel assembly of the seventh aspect, similarly to the first to sixth aspects, the side cut and the pinch cut of the pneumatic tire can be prevented.

It is the perspective view which made a section of a tire and wheel assembly provided with the tire guard concerning a 1st embodiment into the section. It is sectional drawing along the rotating shaft of the tire and wheel assembly which shows the positional relationship of a tire and a tire guard. It is sectional drawing along the rotating shaft of the tire-wheel assembly which shows the state at the time of puncture. (A), (B) is sectional drawing along the rotating shaft of the tire wheel assembly which shows the positional relationship of the tire and a tire guard at the time of zero load and a load. It is the perspective view which made some cross sections the tire-wheel assembly provided with the tire guard which concerns on 2nd Embodiment. It is sectional drawing along the rotating shaft of the tire and wheel assembly provided with the tire guard which concerns on 2nd Embodiment. It is sectional drawing along the rotating shaft of the tire and wheel assembly provided with the tire guard which concerns on 3rd Embodiment.

[First Embodiment]
A tire / wheel assembly including a tire guard according to a first embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the tire / wheel assembly 20 of this embodiment includes a wheel 22, a tire 10, and a tire guard 24.

  First, the tire 10 of this embodiment will be described. The tire 10 of this embodiment includes a pair of bead portions 12, a side portion 14 that extends outward from the bead portion 12 in the tire radial direction, a tire radial direction outer end of one side portion 14, and a tire radial direction of the other side portion 14. A tire case 17 made of a thermoplastic material comprising a crown portion 16 that connects the outer end is provided.

  The tire case 17 includes, for example, an annular tire half body having the same shape in which one bead portion 12, one side portion 14, and a half-width crown portion 16 are integrally formed by molding or the like. Although it can be formed by welding or the like at the tire equator surface portion, it may originally be a single member or may be formed by joining three or more members.

  As the thermoplastic material used for the tire case 17, a thermoplastic resin, a thermoplastic elastomer (TPE), or the like can be used. However, in consideration of elasticity required at the time of running and moldability at the time of manufacture, the thermoplastic elastomer is used. It is preferable to use it. Examples of the thermoplastic elastomer include an amide thermoplastic elastomer (TPA), an ester thermoplastic elastomer (TPC), an olefin thermoplastic elastomer (TPO), a styrene thermoplastic elastomer (TPS) defined in JIS K6418, Examples thereof include urethane-based thermoplastic elastomer (TPU), crosslinked thermoplastic rubber (TPV), and other thermoplastic elastomers (TPZ). In particular, TPV partially kneaded with rubber-based resin is preferable. Examples of the thermoplastic resin include urethane resin, olefin resin, vinyl chloride resin, polyamide resin, and the like.

  As these thermoplastic materials, for example, the deflection temperature under load specified at ISO 75-2 or ASTM D648 (at the time of 0.45 MPa load) is 78 ° C. or more, the tensile yield strength specified by JIS K7113 is 10 MPa or more, Similarly, the tensile yield elongation specified in JIS K7113 is 10% or more, the tensile breaking elongation specified in JIS K7113 (JIS K7113) is 50% or more, and the Vicat softening temperature (Method A) specified in JIS K7206 is 130 °. What is C or more can be used.

An annular bead core 18 similar to a conventional general pneumatic tire is embedded in the bead portion 12.
As shown in FIG. 6, a crown portion reinforcing layer 28 (not shown in FIG. 1) made of a steel reinforcing cord 26 wound spirally is embedded in the crown portion 16 of the tire 10. .

  As shown in FIG. 1, a tread rubber layer 30 made of rubber having higher wear resistance than the thermoplastic material constituting the tire case 17 is disposed on the outer peripheral side of the crown portion reinforcing layer 28. The rubber used for the tread rubber layer 30 is preferably the same type of rubber as used in conventional general pneumatic tires made of rubber, but is more resistant to abrasion than the thermoplastic material constituting the tire case 17. It is good also as a tread layer which consists of another kind of thermoplastic material excellent in property.

  The tire 10 of the present embodiment does not include a carcass provided by a conventional general pneumatic tire whose elastic body portion is formed of rubber, has a simple structure, and is reduced in weight.

(Tire guard 24)
Next, the tire guard 24 of this embodiment will be described.
As shown in FIG. 1, the tire guard 24 is attached to a guard portion 32 disposed on the outer side in the tire width direction of the side portion 14 located on the outer side in the vehicle width direction when mounted on the vehicle and a central portion on the outer surface of the disk portion 34 of the wheel 22. Mounting portion 36, and a connecting portion 38 that connects the mounting portion 36 and the guard portion 32.

  A hole 44 through which a hub bolt 42 provided on a vehicle hub 40 (not shown) is inserted is formed in the center portion of the disk portion 34 of the wheel 22, and a hole 45 through which the hub bolt 42 is inserted is also formed in the mounting portion 36. ing.

  The tire guard 24 of the present embodiment is formed of a metal such as an aluminum alloy. However, the tire guard 24 may be formed of other metals, or may be formed of a material other than metal, for example, a synthetic resin such as fiber reinforced plastic. it can.

  As shown in FIG. 2, the guard portion 32 is thick so as to cover the bead portion 12 and the side portion 14 that are exposed to the outer side in the tire radial direction than the rim flange 48 provided on the rim portion 46 of the wheel 22. It is formed in a flat plate shape and an annular shape.

As shown in FIG. 1, the boundary L ₂ and the connecting portion 38 and the boundary L _1, and the mounting portion 36 of the connecting portion 38 and the guard portion 32 is a portion that is shown in phantom, respectively two points in FIG. 1 .
In the guard portion 32 of the present embodiment, a plurality of slit-like through holes 50 extending in the radial direction are formed in the circumferential direction.

The guard portion 32 is configured such that the internal pressure of the tire / wheel assembly 20 is an air pressure corresponding to the maximum load of the single wheel described in the standard, and the maximum load of the single wheel in the applicable size described in the standard is applied. In addition, the outer peripheral portion of the guard portion 32 is set to an outer diameter that does not contact the road surface. That is, as shown in FIG. 2, the outer diameter (maximum value) of the guard part 32 is set so that the guard part 32 does not contact the road surface 56 during normal traveling (in FIG. 2, the solid line indicates (No load state, two-dot chain line indicates load state)
In addition, it is preferable that the guard part 32 covers at least the maximum width part of the tire 10 so that the side surface of the tire 10 does not contact the curbstone or the like.

The guard portion 32 preferably covers at least the tire maximum width portion of the pneumatic tire 10.
An elastic body 52 such as rubber or thermoplastic elastomer that is softer than the guard portion is attached to the outer periphery of the guard portion 32 of the present embodiment.

  The tire guard 24 is fixed to the wheel 22 by bringing the attachment portion 36 into close contact with the central portion of the outer surface of the disk portion 34 and screwing and tightening the wheel nut 54 to the hub bolt 42 protruding from the hole 45.

  When the tire guard 24 is fixed to the wheel 22 in this way, the guard portion 32 corresponds to the maximum load of the single wheel described in the standard of the pneumatic tire 10 with respect to the tire / wheel assembly 20. When the maximum load of a single wheel in the applicable size described in the standard is applied, as shown in FIG. 2, the side portion 14 of the pneumatic tire 10 (the tire width direction on the lower side of the tire rotation axis) The positional relationship (offset amount) between the mounting portion 36 and the guard portion 32 is determined so as not to come into contact with the portion swelled to the rear.

(Function)
The operation of the tire guard 24 of the present embodiment will be described.
As shown in FIG. 1, the tire guard 24 of the present embodiment has a hole 45 through which the hub bolt 42 is inserted in the mounting portion 36, so that the mounting portion 36 is brought into close contact with the central portion of the outer surface of the disk portion 34. The tire guard 24 can be easily fixed to the wheel 22 by screwing and tightening the wheel nut 54 to the hub bolt 42 protruding from the hole 44 of 22.

By attaching the tire guard 24 to the wheel 22 in this way, the guard portion 32 can be arranged at an interval in the tire width direction outside of the side portion 14 outside the vehicle width direction when the pneumatic tire 10 is mounted on the vehicle. it can.
Accordingly, for example, curbs are prevented from coming into contact with the guard part 32 and directly into the side part 14 when the vehicle is traveling, so that a side cut of the pneumatic tire 10 can be prevented.

In addition, a pinch cut (plastic deformation of the side portion) may occur in the side portion 14 of the pneumatic tire 10 due to an impact when the curbstone or the like is climbed strongly. A part of the load is applied to the tire guard 24 in contact with the outer peripheral portion (elastic body 52) of the tire, and a large impact does not act on the pneumatic tire 10, so that pinch cut can be prevented.
In addition, since the curbstone or the like comes into contact with the elastic body 52 provided on the outer periphery of the guard portion 32, the impact from the curbstone or the like is absorbed by the deformation of the elastic body 52, and damage to the guard portion 32 can be suppressed.

  The tire guard 24 according to the present embodiment is configured such that the internal pressure of the pneumatic tire 10 is an air pressure corresponding to the maximum load of a single wheel described in the standard, and the single size in the application size described in the standard for the pneumatic tire 10 is used. Since the outer diameter of the guard portion 32 is set so that the outer peripheral portion of the guard portion 32 does not come into contact with the road surface when the maximum load of the wheel is applied, the outer periphery of the guard portion 32 during normal driving on a flat road surface Does not come into contact with the road surface, and generation of abnormal noise and wear of the guard portion 32 are prevented.

Moreover, the tire guard 24 of this embodiment sets the internal pressure of the pneumatic tire 10 to air pressure corresponding to the maximum load of a single wheel described in the standard, and the applicable size described in the standard for the pneumatic tire 10. Is attached to the wheel 22 so that the side portion (bulging portion) 14 of the pneumatic tire 10 and the guard portion 32 do not come into contact with each other when the maximum load of a single wheel is applied, during normal driving on a flat road surface The pneumatic tire 10 does not come into contact with the guard portion 32, and it is possible to prevent generation of abnormal noise and wear of the side portion 14.
In the pneumatic tire 10, when the steering wheel is turned (when the slip angle is added), the deformation of the side portion 14 may be larger than when the vehicle is traveling straight ahead. The distance from the side portion 14 is set so as not to touch 14.

  Furthermore, the tire guard 24 of the present embodiment enables the vehicle to travel even when the pneumatic tire 10 is punctured or the internal pressure is reduced. When the internal pressure of the pneumatic tire 10 decreases due to puncture or the like, the pneumatic tire 10 is crushed by a load as shown in FIG. 3, but the outer peripheral portion (elastic body 52) of the guard portion 32 contacts the road surface 56 and rolls. Therefore, the pneumatic tire 10 is prevented from being completely crushed, and the vehicle can travel.

  At this time, since the elastic body 52 softer than the metal guard portion 32 is in contact with the road surface, an impact acting on the guard portion 32 from the road surface is absorbed, and damage to the guard portion 32 can be prevented. Further, when the metal guard portion 32 is in contact with the road surface, the generation of noise is unavoidable. However, in this embodiment, the elastic body 52 that is softer than the metal guard portion 32 is in contact with the road surface. Generation of sound is suppressed.

  At the time of puncture, the side portion 14 may come into contact with the guard portion 32 as shown in FIG.

  Further, since a plurality of through holes 50 are formed in the guard portion 32 of the tire guard 24 of the present embodiment along the circumferential direction, the air between the guard portion 32 and the side portions 14 is passed through the through holes 50. Through the tire width direction outside of the guard portion 32, or the outside air in the tire width direction outside of the guard portion 32 can be introduced between the guard portion 32 and the side portion 14, and the side portion 14 generated by running is generated. It becomes easy to dissipate the heat. Thereby, the heat generation durability of the side portion 14 can be ensured.

  In addition, although the through-hole 50 of this embodiment was the slit shape formed long in radial direction, other shapes, such as a circle | round | yen and a rectangle, may be sufficient. If there is no problem with the heat dissipation of the side portion 14, the through hole 50 may not be formed in the guard portion 32.

  The tire 10 used in the tire / wheel assembly 20 of the present embodiment is a pneumatic tire in which the tire case 17 is formed of a thermoplastic material and is lightened without carcass, but the tire guard of the present embodiment. By using 24, damage to the side portion 14 such as side cut and pinch cut of the tire 10 can be prevented without impairing the merit of the tire 10.

  It is preferable that the tire guard 24 has such strength that it will not get over the curb or be plastically deformed by running during tire puncture.

  Although the tire 10 of the present embodiment is a pneumatic tire in which the tire case 17 is formed of a thermoplastic material, the tire 10 may be a conventional general pneumatic tire in which the tire case is formed of rubber. The constituent material of the tire assembled to the tire / wheel assembly 20 is not particularly limited.

  In the FEM simulation results, the tire maximum width growth when a load of 2.6 N is applied to a pneumatic tire having a tire size of 155 / 65R13 having an internal pressure of 210 kPa is 20%, and the tire size 165 having an internal pressure of 300 kPa. The tire maximum width growth when a load of 2.6 N was applied to a / 40R16 pneumatic tire was 3.5%.

  From this, in order to prevent the guard part 32 from contacting the tire 10 during normal running, when the size of the tire 10 is 155 / 65R13 as described above, the distance from the tire equatorial plane CL to the guard part 32 under load is obtained. The distance Lb is preferably set to a value exceeding 120% of the distance La from the tire equatorial plane CL at zero load to the tire maximum width portion. When the size of the tire 10 is 165 / 40R16 as described above, It is preferable to set the distance Lb from the tire equatorial plane CL to the guard portion 32 at the time of loading to a value exceeding 103.5% of the distance La from the tire equatorial plane CL to the maximum tire width portion at zero load. I understand.

  The connecting portion 38 of the present embodiment has a plate shape extending in the radial direction that connects the outer peripheral portion of the attaching portion 36 and the inner peripheral portion of the guard portion 32, but the shape of the connecting portion 38 is the same as that of the attaching portion 36. Other shapes such as an annular shape connecting the outer peripheral portion and the inner peripheral portion of the guard portion 32 may be used.

In the tire guard 24 of the present embodiment, the guard portion 32 has a flat plate shape as shown by a solid line in FIG. 2, but the cross-sectional shape of the guard portion 32 is not limited to this, and as shown by a two-dot chain line in FIG. 2. The guard portion 32 may be curved in a direction in which the outer peripheral side is separated from the tire 10.
The wheel (rim) 22 is a standard rim (or “Approved Rim” or “Recommended Rim”) in an applicable size described in a tire standard.

[Second Embodiment]
Next, a tire guard 24 according to a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.
As shown in FIGS. 5 and 6, the tire guard 24 of the present embodiment is provided with an annular attachment portion 58 for attachment to the outer surface of the rim flange 46 on the inner peripheral side of the guard portion 32.

The attachment portion 58 is disposed on the outer surface of the rim flange 48, and an annular attachment fitting 60 is disposed on the opposite side of the attachment portion 58 from the rim flange side.
A plurality of screw holes 62 are formed in the rim flange 48 along the circumferential direction, and holes 64 are formed in the attachment portion 58 at positions facing the screw holes 62 of the rim flange 48, A hole 66 is formed at a position facing the screw hole 62 of the rim flange 48.

  The bolts 68 are inserted into the holes 66 of the mounting bracket 60 and the holes 64 of the mounting portion 58 from the outside of the mounting bracket 60 and screwed into the screw holes 62 of the rim flange 48 to be tightened. And the mounting bracket 60.

  In addition, the tire guard 24 of this embodiment can also obtain the same effect as the tire guard 24 of the first embodiment. Further, the tire guard 24 of the present embodiment has a simple structure and uses less material than the tire guard 24 of the first embodiment.

  Further, the tire guard 24 of the first embodiment is not attached to the vehicle side of the tire 10, but the tire guard 24 of the present embodiment can be attached to the vehicle side of the tire 10.

[Third Embodiment]
Next, a tire guard 24 according to a third embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same structure as embodiment mentioned above, and the description is abbreviate | omitted.
As shown in FIG. 7, the tire guard 24 of the present embodiment is provided with an attachment portion 70 disposed between the rim flange 48 and the bead portion 12 of the pneumatic tire 10 on the inner peripheral side of the guard portion 32. ing.

  The tire guard 24 according to the present embodiment has the inner diameter of the tire guard 24 smaller than the outer diameter of the rim flange 48 of the wheel 22 and cannot be attached from the outside to the inside of the rim flange 48.

  The wheel 22 to which the tire guard 24 of the present embodiment is attached is of a type in which the rim portion can be divided into an inner rim 22A and an outer rim 22B (for example, the inner rim 22A and the outer rim 22B are fixed with bolts 23). The pneumatic tire 10 and the tire guard 24 are attached after dividing the inner rim 22A and the outer rim 24B.

  By holding the mounting portion 70 between the outer rim flange 48 and the bead portion 12 when the vehicle is mounted, the guard portion 32 is positioned outside in the vehicle width direction when the pneumatic tire 10 is mounted on the vehicle, as in the above-described embodiment. It can arrange | position on the tire width direction outer side. The rim flange 48 and the attachment portion 70 may be fixed with bolts.

The tire guard 24 of the present embodiment can also obtain the same functions and effects as the tire guard 24 of the first embodiment and the tire guard 24 of the second embodiment.
The tire guard 24 of the present embodiment has a simple structure like the tire guard 24 of the second embodiment, and uses less material than the tire guard of the first embodiment. Similarly to the tire guard 24 of the second embodiment, the tire guard 24 of the third embodiment can be attached to the vehicle side of the tire 10.

[Other Embodiments]
The shape of the tire guard of the present invention is not limited to the shape shown in the first to third embodiments, and various modifications can be made without departing from the spirit of the present invention.
In the first embodiment, the tire guard 24 is fixed to the central portion of the outer surface of the disk portion 34. In the second embodiment, the tire guard 24 is fixed to the outer surface of the rim flange 48. In the third embodiment, the tire guard 24 is fixed. Is fixed between the rim flange 48 and the bead portion 12, but the fixing position of the tire guard 24 is not limited to that of the above-described embodiment, and may be anywhere on the wheel 22.

In the tire / wheel assembly 20 of the above embodiment, the tire guard 24 is disposed on the outer side in the vehicle width direction when the tire 10 is mounted on the vehicle, but may be disposed on the vehicle side of the tire 10.
When the wheel 22 is of a type that can be divided into an inner rim 22A and an outer rim 22B, the rim flange 48 and the tire guard 24 are integrated (for example, the rim flange 48 and the tire guard 24 in FIG. 7). Can also be integrated).

10 Tire (Pneumatic tire)
20 Tire / Wheel Assembly 22 Wheel 24 Tire Guard 32 Guard Part 36 Attachment Part 38 Connection Part 50 Through Hole (Hole)
52 Elastic body

Claims (7)

Provided with a guard part that is arranged apart from the pneumatic tire on the outer side in the tire width direction of the pneumatic tire,
The said guard part is a tire guard provided with the attaching part for attaching to the wheel which assembles | attaches the said pneumatic tire.   When the mounting portion is attached to the wheel on which the pneumatic tire is mounted, the guard portion has an internal pressure that is an air pressure corresponding to the maximum load of a single wheel in the applicable size described in the tire standard, and the tire standard The tire guard according to claim 1, wherein the tire guard does not come into contact with the pneumatic tire when a maximum load of a single wheel in the described application size is applied.   When the mounting portion is attached to the wheel on which the pneumatic tire is mounted, the guard portion has an internal pressure that is an air pressure corresponding to the maximum load of a single wheel in the applicable size described in the tire standard, and the tire standard The tire guard according to claim 1 or 2, wherein the outer peripheral portion is set to an outer diameter that does not contact the road surface when a maximum load of a single wheel in the described application size is applied.   The tire guard according to any one of claims 1 to 3, wherein an elastic body that is softer than the guard portion is attached to an outer peripheral portion of the guard portion.   The tire guard according to any one of claims 1 to 4, wherein a plurality of holes are formed in the guard portion along a circumferential direction.   A wheel to which the tire guard according to any one of claims 1 to 5 is attached.   A tire / wheel assembly in which a pneumatic tire is assembled to a wheel to which the tire guard according to any one of claims 1 to 5 is attached.