JP2022085280A - Tire assembly - Google Patents

Abstract

To surely fix a non-pneumatic tire to a rim.SOLUTION: A tire assembly includes: a rim 12; and a non-pneumatic tire 3 which has an inner cylinder 21 surrounding an outer peripheral surface of the rim from the outside in a radial direction, an outer cylinder 22 surrounding the inner cylinder from the outside in the radial direction, and a plurality of elastically deformable connection members 23 which connect an outer peripheral surface of the inner cylinder and an inner peripheral surface of the outer cylinder. In the inner cylinder, a division section 15 is formed to divide the inner cylinder in a circumferential direction. The tire assembly further includes: a fixture 5 which has each fixed recess formed on both sides sandwiching the division section in the circumferential direction and a pair of engagement projections 18 fitted to each of the pair of fixed recesses on the outer peripheral surface of the inner cylinder and is mounted on the outer peripheral surface of the inner cylinder; and a fixed shaft 6 which passes through the inner cylinder in the radial direction, is engaged with the fixture and the rim, and applies force directed to the inside in the radial direction to the fixture.SELECTED DRAWING: Figure 2

Description

The present invention relates to a tire assembly.

Conventionally, a tire assembly in which a non-pneumatic tire having an inner cylinder, an outer cylinder, and a connecting member is mounted on the outer peripheral surface of the rim has been known.
As a tire assembly of this type, for example, as shown in Patent Document 1 below, an inner cylinder is divided at a plurality of points along the circumferential direction, and a connection extending continuously over the entire length in the circumferential direction to the outer peripheral surface of the inner cylinder. It is known that the means are wound together.

Japanese Patent No. 4093318

However, the conventional tire assembly has a problem that it is difficult to securely fix the non-pneumatic tire to the rim because, for example, the connecting means is deformed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tire assembly capable of reliably fixing a non-pneumatic tire to a rim.

In order to solve the above problems, the present invention proposes the following means.
The tire assembly according to the present invention includes a rim, an inner cylinder that surrounds the outer peripheral surface of the rim from the radial outside, an outer cylinder that surrounds the inner cylinder from the radial outside, and an outer peripheral surface and the outer side of the inner cylinder. A non-pneumatic tire having a plurality of elastically deformable connecting members for connecting to the inner peripheral surface of the cylinder is provided, and the inner cylinder is formed with a dividing portion for dividing the inner cylinder in the circumferential direction. On the outer peripheral surface of the cylinder, fixing recesses are separately formed on both sides of the divided portion in the circumferential direction, and a pair of engaging protrusions fitted separately to the pair of fixing recesses are provided on the inner cylinder. A fixture attached to the outer peripheral surface and a fixing shaft that pierces the inner cylinder in the radial direction and engages with the fixing tool and the rim to apply a force inward in the radial direction to the fixing tool. , Is equipped.

According to the present invention, since the inner cylinder is formed with a divided portion, when a non-pneumatic tire is attached to the rim, the divided portion can be expanded to deform the inner cylinder, and the inside of the inner cylinder can be deformed. The rim can be easily provided on the tire.
With the pair of engaging protrusions provided on the fixator fitted separately in the fixing recesses of the inner cylinder, the fixing shaft applies a force inward in the radial direction to the fixative, so that it engages. It is possible to prevent the protrusion from coming off the fixing recess and expanding the dividing portion, so that the non-pneumatic tire can be securely fixed to the rim.
Since the fixed shaft penetrates the inner cylinder in the radial direction and engages with the fixture and the rim, it is possible to prevent the relative circumferential misalignment of the non-pneumatic tire and the rim.

The first surface of the inner surface of the fixing recess, which is located on the dividing portion side along the circumferential direction and faces the circumferential direction, and the surface of the engaging protrusion, located on the dividing portion side along the circumferential direction. The second surface facing the circumferential direction abuts on each other, and at least one of the first surface and the second surface extends toward the dividing portion side along the circumferential direction as it goes outward in the radial direction. You may.

In this case, at least one of the first surface of the fixing recess and the second surface of the engaging protrusion extends outward in the radial direction toward the dividing portion along the circumferential direction, so that the fixed shaft Applyes a force inward in the radial direction to the fixture and presses the first surface and the second surface against each other to generate a force in the inner cylinder in a direction that narrows the width of the divided portion in the circumferential direction. Is possible, and the inner cylinder can be firmly fixed to the rim.

A mounting recess extending in the circumferential direction may be provided on the outer peripheral surface of the rim, and a fitting protrusion fitted to the mounting recess may be formed on the inner peripheral surface of the inner cylinder.

In this case, a mounting recess extending in the circumferential direction is provided on the outer peripheral surface of the rim, and a fitting protrusion fitted to the mounting recess is formed on the inner peripheral surface of the inner cylinder, so that the non-pneumatic tire and the rim are formed. It becomes possible to regulate the relative movement in the width direction of the tire, and the non-pneumatic tire can be stably fixed to the rim.
As described above, since the inner cylinder has a dividing portion, when mounting a non-pneumatic tire on the rim, the dividing portion is expanded and the inner cylinder is deformed to form a fitting protrusion in the mounting recess. Can be easily fitted.

The inner cylinder has a pair of dividing sections that face each other in the circumferential direction and define the divided sections, and the inner cylinder penetrates the divided portions in the radial direction and surrounds the pair of the divided sections separately. A first through hole is formed to be recessed in the direction, and the fixed shaft may be inserted into the first through hole.

In this case, since the inner cylinder is formed with a first through hole that penetrates the divided portion in the radial direction, it can be easily assembled by inserting a fixed shaft that penetrates the inner cylinder in the radial direction into the first through hole. can.

A plurality of sets of the pair of engaging protrusions are provided at intervals in the width direction, and a plurality of sets of the pair of fixing recesses are provided at intervals in the width direction and separated from the first through hole in the width direction. You may.

In this case, since a pair of engaging protrusions and a pair of fixing recesses are each provided at intervals in the width direction, the inner cylinder is surely suppressed from being deformed so as to expand the divided portion. be able to.
Since the fixing recess is separated from the first through hole in the width direction, it is possible to prevent the fixing recess and the first through hole from being close to each other, and it is possible to secure the strength of the inner cylinder.

A second through hole penetrating in the radial direction is formed in the rim, a female screw portion is formed in the fixture, the fixing shaft is a head bolt having a head portion and a shaft portion, and the head portion is the rim. The shaft portion may be placed on the inner peripheral surface of the fixture and the shaft portion may be screwed onto the female screw portion of the fixture.

In this case, since the shaft portion of the fixed shaft is inserted into the second through hole from the inner peripheral surface side of the rim and screwed to the female screw portion of the fixative, a space is provided between the inner cylinder and the outer cylinder. Inside the wider rim in the radial direction, the head can be sandwiched between spanners and the like, and the fixed shaft can be rotated around the axis, so that excellent operability can be provided.
A general-purpose wheel on which an inflatable tire is mounted may be adopted as the wheel, and the through hole into which the valve for injecting air has been inserted may be diverted as the second through hole.

According to the present invention, the non-pneumatic tire can be securely fixed to the rim.

It is a side view of the tire assembly which concerns on one Embodiment. FIG. 3 is a perspective view including a cross section taken along the line II-II of FIG. It is a perspective view including a partial cross section of FIG. FIG. 1 is a cross-sectional view taken along the line IV-IV of FIG.

Hereinafter, the tire assembly 1 according to the present embodiment will be described with reference to FIGS. 1 to 4.
As shown in FIGS. 1 and 2, the tire assembly 1 includes a wheel 2 with a rim 12, a non-pneumatic tire 3, a tread member 4, a fixture 5, and a fixing shaft 6. The tire assembly 1 is used by being mounted on, for example, a bicycle, a wheelchair, a two-wheeled vehicle, an automobile, or the like.

The rim 12, the non-pneumatic tire 3, and the tread member 4 are each formed in an annular shape, and each central axis is located on a common axis. This common axis is called the central axis O, and the direction along the central axis O is called the width direction. Further, when viewed from the width direction, the direction that orbits around the central axis O is referred to as the circumferential direction, and the direction that intersects the central axis O is referred to as the radial direction.
The central portions of the wheel 2, the non-pneumatic tire 3, and the tread member 4 in the width direction coincide with each other.

The wheel 2 includes a hub 11 attached to an axle, a rim 12 that surrounds the hub 11 from the outside in the radial direction, and a plurality of spokes 13 that connect an outer peripheral surface of the hub 11 and an inner peripheral surface of the rim 12. There is.

The hub 11 is formed in a cylindrical shape and is arranged coaxially with the central axis O. The spokes 13 connect the outer peripheral surface of the hub 11 to the inner peripheral surface of the rim 12. The plurality of spokes 13 are provided over the entire circumferential direction between the outer peripheral surface of the hub 11 and the inner peripheral surface of the rim 12.
The rim 12 extends continuously over the entire length in the circumferential direction and is formed in a tubular shape that opens outward in the radial direction as shown in FIG. As a result, the outer peripheral surface of the rim 12 is provided with a mounting recess 16 that continuously extends over the entire length in the circumferential direction. A second through hole 33 penetrating in the radial direction is formed in the rim 12. One second through hole 33 is provided in the rim 12.
The wheel 2 is the same as a general-purpose wheel on which an inflatable tire is mounted, and the second through hole 33 is a through hole into which a valve for injecting air is inserted. It is not necessary to provide the mounting recess 16 and the second through hole 33 in the rim 12.

The non-pneumatic tire 3 has an inner cylinder 21 that surrounds the outer peripheral surface of the rim 12 from the outside in the radial direction, an outer cylinder 22 that surrounds the inner cylinder 21 from the outside in the radial direction, and an outer peripheral surface of the inner cylinder 21 and the inner cylinder 22. It has a plurality of elastically deformable connecting members 23 that connect to the peripheral surface. The Young's modulus of the material forming the non-pneumatic tire 3 is, for example, 30 MPa or more and 1500 MPa or less.

The inner cylinder 21 and the outer cylinder 22 are arranged coaxially with the central axis O. The inner cylinder 21, the outer cylinder 22, and the connecting member 23 are arranged so that their central portions in the width direction coincide with each other.

A fitting protrusion 27 fitted to the mounting recess 16 of the rim 12 is formed on the inner peripheral surface of the inner cylinder 21. The fitting protrusion 27 continuously extends over the entire length in the circumferential direction except for the divided portion 15 described later in the inner cylinder 21. The fitting protrusion 27 is provided at the center of the inner peripheral surface of the inner cylinder 21 in the width direction. The width of the inner cylinder 21 is wider than the width of the rim 12. Of the inner peripheral surface of the inner cylinder 21, a portion located outside the fitting protrusion 27 in the width direction is in contact with the outer peripheral surface of the rim 12. The size of the fitting protrusion 27 decreases in the width direction toward the inside in the radial direction. As shown in FIG. 2, the fitting projection 27 has a symmetrical shape with respect to a straight line extending in the radial direction through the central portion in the width direction of the inner cylinder 21 in a vertical cross-sectional view along both the width direction and the radial direction. Present.

The plurality of connecting members 23 are provided between the outer peripheral surface of the inner cylinder 21 and the inner peripheral surface of the outer cylinder 22 at intervals in the circumferential direction. The plurality of connecting members 23 are provided at equal intervals in the circumferential direction. As shown in FIG. 1, the plurality of connecting members 23 extend in the same direction with respect to the radial direction when viewed from the width direction. The connecting member 23 is formed in a plate shape, and is provided in such a posture that the front and back surfaces face the circumferential direction or the radial direction and the side surfaces face the width direction.

The inner cylinder 21, the outer cylinder 22, and the connecting member 23 are integrally formed of a thermoplastic resin. The thermoplastic resin may be, for example, a mixture containing only one kind of resin or two or more kinds of resins, or a mixture containing one or more kinds of resins and one or more kinds of elastomers, and further, for example, an antioxidant. , Plasticizers, fillers, or additives such as pigments.
The inner cylinder 21, the outer cylinder 22, and the connecting member 23 may be formed separately. The inner cylinder 21, the outer cylinder 22, and the connecting member 23 may be made of a material other than the thermoplastic resin.

The tread member 4 is formed so as to be elastically deformable, and is externally fitted to the outer cylinder 22. The Young's modulus of the material forming the tread member 4 is smaller than the Young's modulus of the material forming the non-pneumatic tire 3. As shown in FIG. 2, the outer peripheral surface of the tread member 4 exhibits a curved shape that protrudes outward in the radial direction in a vertical cross-sectional view along both the width direction and the radial direction.

The tread member 4 is made of, for example, natural rubber and / or vulcanized rubber obtained by vulcanizing a rubber composition, a thermoplastic material, or the like. From the viewpoint of wear resistance, it is preferable to form the tread member 4 with vulcanized rubber. Examples of the thermoplastic material include a thermoplastic elastomer and a thermoplastic resin.
Examples of the thermoplastic elastomer include an amide-based thermoplastic elastomer (TPA), an ester-based thermoplastic elastomer (TPC), an olefin-based thermoplastic elastomer (TPO), a styrene-based thermoplastic elastomer (TPS), and urethane specified in JIS K6418. Examples thereof include a thermoplastic elastomer (TPU), a thermoplastic rubber crosslinker (TPV), and other thermoplastic elastomers (TPZ).
Examples of the thermoplastic resin include urethane resin, olefin resin, vinyl chloride resin, polyamide resin and the like.

Here, in the present embodiment, the inner cylinder 21 is formed with a dividing portion 15 that divides the inner cylinder 21 in the circumferential direction. The divided portion 15 has a width in the circumferential direction in a state where the inner cylinder 21 is fixed to the outer peripheral surface of the rim 12. The inner cylinder 21 has a pair of divided cross sections 15a that face each other in the circumferential direction and define the divided portions 15. One dividing portion 15 is provided. A plurality of divided portions 15 may be provided at intervals in the circumferential direction.

The inner cylinder 21 is formed with a first through hole 14 that penetrates the divided portion 15 in the radial direction and recesses the pair of divided cross sections 15a in the circumferential direction. That is, the inner diameter of the first through hole 14 is larger than the width of the divided portion 15. As shown in FIG. 4, the first through hole 14 is formed in the central portion of the inner cylinder 21 in the width direction. When viewed from the radial direction, the centers of the first through hole 14 and the dividing portion 15 coincide with each other.

On the outer peripheral surface of the inner cylinder 21, fixing recesses 17 are separately formed on both sides of the divided portion 15 in the circumferential direction.
The pair of fixing recesses 17 are provided at positions in the same width direction at intervals in the circumferential direction. A plurality of sets of the pair of fixing recesses 17 are provided at intervals in the width direction, and are separated from the first through hole 14 in the width direction. The pair of fixing recesses 17 are also separated from the first through hole 14 in the circumferential direction. A pair of fixing recesses 17 are formed on the outer peripheral surface of the inner cylinder 21 on both sides of the first through hole 14 in the width direction.

A part of the fixing recess 17 may be located at a position in the same width direction with respect to the first through hole 14, or may be located at a position in the same circumferential direction. The fixing recess 17 may be formed over the entire length of the outer peripheral surface of the inner cylinder 21 excluding both ends in the width direction. The fixing recess 17 may penetrate the inner cylinder 21 in the radial direction.

The fixture 5 is made of, for example, a metal material. As shown in FIGS. 2 and 3, the fixture 5 is attached to the outer peripheral surface of the inner cylinder 21 and straddles the divided portion 15 in the circumferential direction. The fixture 5 is formed in a plate shape with the front and back surfaces facing in the radial direction. A female screw portion 5a penetrating in the radial direction is formed on the fixture 5. The female thread portion 5a is formed in the central portion of the fixture 5 when viewed from the radial direction. The fixture 5 is radially outwardly separated from the outer peripheral surface of the inner cylinder 21.

The fixative 5 is provided with a pair of engaging protrusions 18 separately fitted to the pair of fixing recesses 17. The pair of engaging protrusions 18 are provided at positions in the same width direction at intervals in the circumferential direction. A plurality of sets of the pair of engaging protrusions 18 are provided at intervals in the width direction, and are separated from the female thread portion 5a in the width direction. The pair of engaging protrusions 18 are also separated from the female thread portion 5a in the circumferential direction. A pair of engaging protrusions 18 are provided on both sides of the fixture 5 so as to sandwich the female screw portion 5a in the width direction on the inner surface facing inward in the radial direction. The size of the engaging protrusion 18 in the width direction is the same over the entire length in the radial direction.

A part of the engaging protrusion 18 may be located at a position in the same width direction with respect to the female screw portion 5a, or may be located at a position in the same circumferential direction. The engagement protrusion 18 may be provided over the entire width direction of the fixture 5.

As shown in FIGS. 3 and 4, of the inner surface of the fixing recess 17, the first surface 17a located on the dividing portion 15 side along the circumferential direction and facing the circumferential direction, and the surface of the engaging projection 18 The second surface 18a, which is located on the side of the divided portion 15 along the circumferential direction and faces the circumferential direction, is in contact with each other. The fixture 5 is attached to the outer peripheral surface of the inner cylinder 21 via the engaging protrusion 18. The inner surface of the fixture 5 facing inward in the radial direction is separated from the outer peripheral surface of the inner cylinder 21 to the outside in the radial direction.

At least one of the first surface 17a and the second surface 18a extends outward in the radial direction toward the divided portion 15 side along the circumferential direction. As shown in FIG. 3, in a vertical cross-sectional view along both the circumferential direction and the radial direction, at least one of the first surface 17a and the second surface 18a is the divided portion 15 as it goes outward in the radial direction. It extends in the direction of approaching the circumferential direction.

In the illustrated example, both the first surface 17a and the second surface 18a extend outward in the radial direction toward the divided portion 15 side along the circumferential direction.
Both end faces in the width direction of the inner surface of the fixing recess 17 and both end faces of the width direction of the surface of the engaging protrusion 18 are in contact with each other. In addition, both end faces in the width direction of the inner surface of the fixing recess 17 and both end faces in the width direction of the surface of the engaging protrusion 18 may be separated from each other in the width direction.
The lower end surface of the engaging protrusion 18 is located above the bottom surface of the fixing recess 17.

The fixing shaft 6 penetrates the inner cylinder 21 in the radial direction and engages with the fixing tool 5 and the rim 12. The fixed shaft 6 is inserted into the first through hole 14 of the inner cylinder 21. The outer diameter of the fixed shaft 6 is larger than the width of the divided portion 15 and smaller than the inner diameter of the first through hole 14.

The fixed shaft 6 is a bolt with a head having a head portion 6a and a shaft portion 6b. The shaft portion 6b is inserted into the second through hole 33 (FIG. 2) from the inner peripheral surface side of the rim 12, and is screwed to the female screw portion 5a of the fixture 5. The head 6a is placed on the inner peripheral surface of the rim 12. As a result, the fixing shaft 6 engages with the fixing tool 5 and the rim 12, and applies a force inward in the radial direction to the fixing tool 5, and as shown in FIG. 3, the second surface of the engaging protrusion 18 is formed. When the 18a presses against the first surface 17a of the fixing recess 17 of the inner cylinder 21, a force is generated on the inner cylinder 21 in a direction to narrow the width of the divided portion 15 in the circumferential direction, and the inner peripheral surface of the inner cylinder 21 is formed. , Tighten the outer peripheral surface of the rim 12.

A through hole may be formed in the fixture 5 instead of the female screw portion 5a, and a nut may be screwed to a portion of the shaft portion 6b of the fixing shaft 6 that protrudes radially outward from the fixture 5. ..
A through hole is formed in the fixture 5 in place of the female screw portion 5a, and the head portion 6a of the fixing shaft 6 is placed on the outer surface of the fixture 5 facing outward in the radial direction, and the shaft portion 6b of the fixing shaft 6 is placed. Of these, a nut may be screwed into a portion protruding inward in the radial direction from the inner peripheral surface of the rim 12.
A through hole is formed in the fixture 5 instead of the female thread portion 5a, a female thread portion is formed in the rim 12 instead of the second through hole 33, and the head portion 6a of the fixing shaft 6 is formed in the radial direction in the fixture 5. The shaft portion 6b of the fixed shaft 6 may be screwed to the female screw portion of the rim 12 by placing it on the outer surface facing the outside of the rim.

As described above, according to the tire assembly 1 according to the present embodiment, since the dividing portion 15 is formed in the inner cylinder 21, when the non-pneumatic tire 3 is mounted on the rim 12, the dividing portion 15 is formed. It becomes possible to deform the inner cylinder 21 by expanding the tire, and the rim 12 can be easily provided inside the inner cylinder 21.

With the pair of engaging protrusions 18 provided on the fixture 5 fitted separately in the fixing recesses 17 of the inner cylinder 21, the fixing shaft 6 exerts a force on the fixture 5 inward in the radial direction. Since it is applied, it becomes possible to prevent the engaging protrusion 18 from coming off from the fixing recess 17 and expanding the divided portion 15, and the non-pneumatic tire 3 can be reliably fixed to the rim 12.
Since the fixed shaft 6 penetrates the inner cylinder 21 in the radial direction and engages with the fixture 5 and the rim 12, it is possible to prevent the relative circumferential misalignment of the non-pneumatic tire 3 and the rim 12. can.

Since at least one of the first surface 17a of the fixing recess 17 and the second surface 18a of the engaging projection 18 extends outward in the radial direction toward the dividing portion 15 side along the circumferential direction. The fixing shaft 6 applies a force inward in the radial direction to the fixing tool 5 and presses the first surface 17a and the second surface 18a against each other to give the inner cylinder 21 the width of the divided portion 15 in the circumferential direction. It becomes possible to generate a force in a narrowing direction, and the inner cylinder 21 can be strongly fixed to the rim 12.

A mounting recess 16 extending in the circumferential direction is provided on the outer peripheral surface of the rim 12, and a fitting protrusion 27 fitted to the mounting recess 16 is formed on the inner peripheral surface of the inner cylinder 21. Therefore, a non-pneumatic tire It becomes possible to regulate the relative movement of the tire 3 and the rim 12 in the width direction, and the non-pneumatic tire 3 can be stably fixed to the rim 12.
As described above, since the divided portion 15 is formed on the inner cylinder 21, when the non-pneumatic tire 3 is attached to the rim 12, the divided portion 15 is expanded and the inner cylinder 21 is deformed to attach the tire 3. The fitting protrusion 27 can be easily fitted into the recess 16.

Since the inner cylinder 21 is formed with a first through hole 14 that penetrates the divided portion 15 in the radial direction, the fixed shaft 6 that penetrates the inner cylinder 21 in the radial direction can be easily inserted into the first through hole 14. Can be assembled.
Since the pair of engaging protrusions 18 and the pair of fixing recesses 17 are each provided in a plurality of sets at intervals in the width direction, the inner cylinder 21 is surely suppressed from being deformed so as to expand the divided portion 15. can do.
Since the fixing recess 17 is separated from the first through hole 14 in the width direction, it is possible to prevent the fixing recess 17 and the first through hole 14 from being close to each other, and to secure the strength of the inner cylinder 21. Can be done.

Since the shaft portion 6b of the fixing shaft 6 is inserted into the second through hole 33 from the inner peripheral surface side of the rim 12 and screwed to the female screw portion 5a of the fixing tool 5, space is created between the inner cylinder 21 and the outer cylinder 21. Inside the rim 12 in the radial direction, which is wider than the space between the cylinder 22 and the cylinder 22, the head 6a can be sandwiched between spanners and the like, and the fixed shaft 6 can be rotated around the axis thereof, thereby providing excellent operability. can.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The tire assembly 1 does not have to have the tread member 4.

In addition, it is appropriately possible to replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the above-mentioned embodiments and modifications may be appropriately combined. ..

1 Tire assembly 2 Wheel 3 Non-pneumatic tire 4 Tread member 5 Fixture 5a Female thread 6 Fixed shaft 6a Head 6b Shaft 12 Rim 14 1st through hole 15 Divided part 15a Cross section 16 Mounting recess 17 Fixed recess 17a No. 1st surface 18 Engagement protrusion 18a 2nd surface 21 Inner cylinder 22 Outer cylinder 23 Connecting member 27 Fitting protrusion 33 2nd through hole

Claims (6)

With the rim
An inner cylinder that surrounds the outer peripheral surface of the rim from the outside in the radial direction, an outer cylinder that surrounds the inner cylinder from the outside in the radial direction, and elastic deformation that connects the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder. With non-pneumatic tires, which have multiple connecting members,
The inner cylinder is formed with a dividing portion that divides the inner cylinder in the circumferential direction.
On the outer peripheral surface of the inner cylinder, fixing recesses are separately formed on both sides of the divided portion in the circumferential direction.
A pair of engaging protrusions fitted separately to each of the pair of fixing recesses are provided, and a fixing tool attached to the outer peripheral surface of the inner cylinder is provided.
A tire assembly comprising a fixing shaft that pierces the inner cylinder in the radial direction and engages with the fixture and the rim to apply a force inward in the radial direction to the fixture. The first surface of the inner surface of the fixing recess, which is located on the dividing portion side along the circumferential direction and faces the circumferential direction, and the surface of the engaging protrusion, located on the dividing portion side along the circumferential direction. The second surface facing in the circumferential direction abuts on each other,
The tire assembly according to claim 1, wherein at least one of the first surface and the second surface extends outward in the radial direction toward the divided portion along the circumferential direction. A mounting recess extending in the circumferential direction is provided on the outer peripheral surface of the rim.
The tire assembly according to claim 1 or 2, wherein a fitting protrusion fitted to the mounting recess is formed on the inner peripheral surface of the inner cylinder. The inner cylinder has a pair of dividing sections that face each other in the circumferential direction and define the divided portion.
The inner cylinder is formed with a first through hole that penetrates the divided portion in the radial direction and recesses the pair of the divided cross sections in the circumferential direction.
The tire assembly according to any one of claims 1 to 3, wherein the fixed shaft is inserted into the first through hole. A plurality of pairs of the engaging protrusions are provided at intervals in the width direction.
The tire assembly according to claim 4, wherein the pair of the fixing recesses are provided in a plurality of sets at intervals in the width direction and are separated from the first through hole in the width direction. A second through hole that penetrates in the radial direction is formed in the rim, and a second through hole is formed.
A female screw portion is formed on the fixture, and a female screw portion is formed.
The fixed shaft is a bolt with a head having a head and a shaft portion.
The tire assembly according to any one of claims 1 to 5, wherein the head is placed on an inner peripheral surface of the rim, and the shaft portion is screwed to the female screw portion of the fixture.

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