JP2002337518A - Tire core assembly, and tire rim assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire core assembly and a tire rim assembly which are less easily broken even when subjected to a large impact such as reduction of the internal pressure of a tire by puncture and ride over a high step on a road surface at a high speed, and allows a vehicle to safely travel at a high speed. SOLUTION: A radial inner end part 11A fitted to a well part 14A of a rim 14, a radial outer end part 11B in contact with an inner surface of a crown part 18 when the tire is squeezed by reduction of the internal pressure thereof, and a wall body 11C erected in the radial direction to connect the radial inner end part 11A to the radial outer end part 11B are integrally formed in a ring shape, long fiber reinforced resin layers 60A and 60B are formed on the radial inner end part 11A and/or the radial outer end part 11B, and remaining parts 62A and 62B of the radial inner end part 11A and the radial outer end part 11B and the wall body 11C are formed of non-long fiber reinforced resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD [0001] The present invention relates to
The present invention relates to a tire core assembly and a tire rim assembly that enable safe driving for a certain distance even when the internal pressure of a tire is reduced.

[0002]

2. Description of the Related Art There have been many examples in the past where a core assembly has been mounted on a rim. In the use condition of the tire on which the core assembly is mounted, in a high load range or a high speed range that is practically possible, run flat (low internal pressure running)
At this time, the contact surface of the core assembly with the rim well portion may be worn due to friction, causing vibration, and the running may not be possible. There is also a disadvantage that the run flat running distance is significantly shortened on an unpaved road.

As a solution to the above disadvantage, a core assembly formed of a heat-resistant synthetic resin material has been proposed. The wear resistance can be improved by using a heat-resistant synthetic resin material, but the strength of the synthetic resin material is generally inferior to that of metal. In a case such as when the core assembly is subjected to a large impact, the core assembly itself may be broken and the vehicle may not be able to run. Therefore, it was necessary to run at low speed during run flat.

It is conceivable to use a fiber reinforced resin (FRP) as a material for the core assembly. In the fiber reinforced resin, the longer the length of the fiber to be contained, the higher the strength generally. Therefore, in order to improve the strength of the core assembly itself, a fiber reinforced resin containing a long fiber (long fiber The core assembly may be formed using reinforced resin). However, the long fiber reinforced resin has low workability, so that it is difficult to obtain a molded article having a relatively complicated shape like a core assembly, and also leads to an increase in cost.

[0005]

Accordingly, the present invention provides
When the internal pressure of the tire decreases due to puncture,
If you get over a large bump or bump on the road at high speed,
It is an object of the present invention to provide a tire core assembly and a tire rim assembly that can be safely driven at high speed and that are not easily broken even when subjected to a large impact and that can be obtained easily and at low cost.

[0006]

The above object is achieved by the present invention described below. That is, the first aspect of the present invention includes at least a radially inner end portion that fits into the well portion of the rim, a radially outer end portion that contacts the inner surface of the crown portion when the tire is crushed due to a decrease in internal pressure, and A ring-shaped tire core assembly formed integrally with an upright wall connecting a radially inner end portion and a radially outer end portion, the radially inner end portion and / or the radius being formed. A long fiber reinforced resin layer is formed at the outer end in the direction, and the other parts of the radial inner end and the radial outer end, and the wall body are made of a non-long fiber reinforced resin. It is a core assembly for a tire.

The tire core assembly of the first invention (hereinafter referred to as the tire core assembly)
It may be simply referred to as “core assembly”. ) Is usually rotating integrally with the rim. When the internal pressure of the tire decreases due to puncture or the like, the tire is crushed on the ground contact side, and the inner surface of the crown comes into contact with the radially outer end of the core assembly. At this time, the core assembly supports the tire from the inside, suppresses the collapse, and enables the tire to run (run flat running) in a state where the internal pressure is low.

[0008] Here, when a large impact is applied, such as when the vehicle gets over a large step or a projection on a road surface at a high speed, a large impact (hereinafter, referred to as "hereinafter") is applied to the radially outer end portion of the core assembly through the tread of the tire. , "Primary impact"). This primary impact acts through the wall of the core assembly between the radially inner end of the core assembly and the well of the rim, this time the radially inner end of the core assembly. Large impact (hereinafter,
This is referred to as “secondary impact”. ) Is added.

As described above, when a large step or a protrusion on a road surface is overcome at a high speed, the primary impact and the secondary impact are applied to the radially outer end and the radially inner end of the core assembly. However, according to the first aspect of the present invention, a very strong long fiber reinforced resin layer is formed at the radially outer end where the primary impact is applied and / or the radially inner end where the secondary impact is applied. As a result, even when a large impact is received, the vehicle is not easily broken, and safe and high-speed traveling is possible.

Further, a layer made of a long-fiber reinforced resin having low workability is formed only at the radial inner end and / or the radial outer end where the improvement in strength is truly desired and the shape is not complicated, Since other portions having complicated shapes are made of non-long fiber reinforced resin having good workability, a desired high strength core assembly can be provided easily and at low cost.

According to the study of the present inventors, the secondary impact is generally larger than the primary impact, and a crack is generated at the radially inner end subjected to the secondary impact and grows at the radially outer end. Often do. Therefore, among the first inventions, it is preferable that the long fiber reinforced resin layer is formed at the radial inner end, and the long fiber reinforced resin layer is formed at both the radial inner end and the radial outer end. What is formed is most preferred.

A second aspect of the present invention is the tire core assembly of the first aspect of the present invention, wherein the non-long fiber reinforced resin is a short fiber reinforced resin. Among the non-long fiber reinforced resins, the short fiber reinforced resin has high strength while having good workability. Therefore, the second invention of the present invention in which a portion having a complicated shape other than the long fiber reinforced resin layer is made of the short fiber reinforced resin According to the tire core assembly of the first aspect, the core assembly of the first aspect of the present invention having extremely high strength can be provided easily and at low cost.

According to a third aspect of the present invention, there is provided the tire core assembly according to the first or second aspect of the present invention, wherein a radially outer end portion further comprises an elastic material which is more flexible than the non-long fiber reinforced resin. Wherein a first buffer layer is provided. Third
In the present invention, since the inner pressure of the tire is reduced due to puncture or the like, the tire is crushed on the ground contact side, and the inner surface of the crown portion of the core assembly is It comes into contact with the first buffer layer provided at the radially outer end. At this time, the core assembly supports the tire from the inside, suppresses the collapse, and enables the tire to run (run flat running) in a state where the internal pressure is low.

Here, the first buffer layer alleviates the primary impact when a large impact is applied, such as when the vehicle gets over a large step or projection at a high speed on the road surface. If the primary shock is reduced by the first buffer layer, the secondary shock applied to the radially inner end of the core assembly via the wall of the core assembly is also naturally reduced. Therefore, according to the third core assembly for a tire of the present invention, the long fiber reinforcement formed at the radially outer end to which the primary impact is applied and / or the radially inner end to which the secondary impact is applied. Together with the effect of the resin layer, the strength against impact is further increased, and it is easy and low cost to provide a safe and high-speed running tire core assembly that does not break even under a large impact during run flat. Can be obtained at

A fourth aspect of the present invention is the tire core assembly according to the third aspect of the present invention, wherein the first buffer layer has a rubber hardness (J).
IS A) is 60 to 80 degrees.
According to the fourth invention, the rubber hardness of the first buffer layer is 60
By setting the angle within the range of -80 degrees, it is possible to reliably reduce the impact such as over a projection. If the rubber hardness of the first buffer layer is less than 60 degrees, the first buffer layer is too soft and the durability of the first buffer layer is reduced. On the other hand, when the rubber hardness of the first buffer layer exceeds 80 degrees, it is too hard to reduce the impact.

According to a fifth aspect of the present invention, any one of the first to fourth aspects is provided.
The tire core assembly of the present invention, further comprising a second buffer layer made of an elastic material that is more flexible than the non-long fiber reinforced resin, at the radially inner end, It is characterized in that a protective layer is provided on the layer.

According to the fifth aspect of the present invention, since the second buffer layer made of an elastic body is provided between the core assembly and the rim, the impact between the core assembly and the rim can be reduced. Can be eased. In addition, during run-flat running, the protective layer rotates in contact with the well portion of the rim, so that the second buffer layer does not wear.

It is preferable that the protective layer has a higher elastic modulus than the second buffer layer. Thereby, the second buffer layer is protected at the time of contact with the rim, and can further have an effect of dispersing an impact from the rim and transmitting the impact to the second buffer layer. When the core assembly and the rim are slid during run flat, the wear resistance due to rotational contact can be improved.

According to a sixth aspect of the present invention, there is provided the tire core assembly according to the fifth aspect of the present invention, wherein the rubber hardness (J
IS A) is 60 to 80 degrees.

According to the sixth aspect of the present invention, by setting the rubber hardness of the second buffer layer within the range of 60 to 80 degrees,
An impact such as over a protrusion can be reliably reduced.
If the rubber hardness of the second buffer layer is less than 60 degrees, the second buffer layer is too soft and the durability of the second buffer layer is reduced. On the other hand, if the rubber hardness of the second buffer layer exceeds 80 degrees, it is too hard to reduce the impact.

A seventh aspect of the present invention is the tire core assembly according to the fifth or sixth aspect, wherein the protective layer is made of a metal material. According to the seventh invention,
Since the protective layer is made of a metal material, the protection of the second buffer layer can be further improved as compared with a synthetic resin material or rubber.

According to an eighth aspect of the present invention, there is provided a tire rim assembly including a rim, a tire mounted on the rim, and a tire core assembly fitted outside a well portion of the rim. The tire core assembly is any one of the first to seventh tire core assemblies.

In the eighth tire rim assembly of the present invention, the tire core assembly is usually rotated integrally with the rim. When the internal pressure of the tire decreases due to puncture or the like, the tire is crushed on the ground contact side, and the inner surface of the crown comes into contact with the radially outer end of the core assembly. At this time, the core assembly supports the tire from the inside, suppresses the collapse, and enables the tire to run (run flat running) in a state where the internal pressure is low.

Here, when a large impact is applied, such as when the vehicle gets over a large step or a projection on the road surface at a high speed, a primary impact is applied to the radially outer end of the core assembly via the tread of the tire. Join. This primary impact acts through the wall of the core assembly between the radially inner end of the core assembly and the well of the rim, this time the radially inner end of the core assembly. Part 2
Next impact is applied.

As described above, when a large step or a protrusion on the road surface is overcome at a high speed, the primary impact and the secondary impact are applied to the radially outer end and the radially inner end of the core assembly. However, according to the eighth aspect of the present invention, a very high-strength long fiber reinforced resin layer is formed at the radially outer end to which the primary impact is applied and / or the radially inner end to which the secondary impact is applied. As a result, even when a large impact is received, the vehicle is not easily broken, and safe and high-speed traveling is possible.

Further, a layer made of a long-fiber reinforced resin having low workability is formed only at the radial inner end and / or the radial outer end where the improvement in strength is truly desired and the shape is not complicated, Since other portions having complicated shapes are made of non-long fiber reinforced resin having good workability, a desired high strength core assembly can be provided easily and at low cost.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below in detail with reference to FIGS. As shown in FIG. 2, the tire core assembly 10 has at least two cores.
It is composed of at least three (in the present embodiment, three) arc-shaped bodies 11, and is assembled in an annular shape by overlapping and connecting the ends of the arc-shaped bodies 11 to each other.

As shown in FIG. 1, the arc-shaped body 11 has a substantially I-shaped (or substantially H-shaped) cross-section in the radial direction, and a wall 11C having a constant width in the radial direction. A radially inner end portion 11A integrally formed on a radially inner portion of the wall body and having a constant width in the axial direction, and a radius integrally formed on a radially outer portion of the wall body 11C and having a fixed width in the axial direction. Direction outer end 11B, radial direction inner end 11A, wall 1
1C and reinforcing rib 1 continuous with radially outer end 11B
1D. The reinforcing ribs 11D are provided at intervals of 10 °.

As shown in FIG. 3 and FIG.
A first fitting portion 20 is provided at one end in the circumferential direction (the arrow CW direction side), and the other in the circumferential direction (the arrow CCW direction).
(Second side) fitted to the first fitting portion 20 at the end of the
Are provided. The first fitting part 20 is provided with an arc part 24.

A circular counterbore 26 having a depth of approximately half the thickness of the wall 11C is coaxially formed on one side (the direction of the arrow R) of the arc 11 with respect to the arc 24. The first through hole 28 is formed at the center of the arc. On the other hand, the second fitting portion 22 is provided with an arc portion 30.

A circular counterbore 32 having a depth substantially half the thickness of the wall 11C is formed coaxially on the other side (the direction of the arrow L) of the arc 11 in the arc portion 30. A second through hole 34 having the same diameter as the first through hole 28 of the first fitting portion 20 is formed at the center of the arc.

Further, washers 36 are provided on both side surfaces of the second fitting portion 22 of the arc-shaped body 11. This washer 36
Through holes 38 are formed at both ends of the arc-shaped body 1.
The washer 36 is locked to the arc-shaped body 11 by inserting the pin 40 inserted into the through hole 38 into one of the through holes 38.

A nut 44 is inserted into a bolt 42 passing through the first through hole 28 of the first fitting portion 20 of the one arc-shaped body 11, the second through hole 34 of the other arc-shaped body 11, and the through hole 38 of the washer 36.
Are screwed together to connect the arc-shaped members 11 to each other. Note that rivets may be used instead of the bolts 42 and the nuts 44.

The radial inner end 11A is fitted on the outer peripheral surface of the well 14A of the rim 14 to which the tire 12 is fixed. On the other hand, the radially outer end portion 11B faces the central portion in the tire width direction of the inner surface 18A of the crown portion 18 of the tire 12.

As shown in FIGS. 1 and 5, in this tire core assembly 10, a long fiber reinforced resin layer 60A is provided at a radial inner end 11A, and a long fiber reinforced resin layer 60B is provided at a radial outer end 11B. The resin layers 60B are respectively formed. Further, other portions 62 of the radial inner end portion 11A.
A and other portions 62 of the radially outer end portion 11B
B and the wall 11C are made of a non-long fiber reinforced resin.

Here, the long fiber reinforced resin layers 60A and 60A
The long fiber reinforced resin constituting OB will be described in detail.

The long fiber reinforced resin refers to a fiber reinforced resin having a fiber length of 1 mm or more, preferably 2 mm or more for higher strength, more preferably 5 mm or more. More preferably 10 mm
More preferably, it is the above. The thickness of the fiber contained in the long fiber reinforced resin is not particularly limited, and is preferably in the range of about 1 to 50 μm, and more preferably in the range of about 5 to 20 μm in consideration of strength and workability. Is more preferred.

The types of fibers contained in the long fiber reinforced resin include, but are not limited to, organic fibers such as glass fiber (GF), carbon fiber (CF) and aramid fiber. Examples of the state of the contained fiber include unidirectional reinforcement, a random mat, a woven fabric, a laminated structure thereof, and the like, and may be any of a chopped fiber and a continuous fiber. The content of the fiber contained in the long fiber reinforced resin is preferably in the range of 30 to 80% by mass, and more preferably in the range of 50 to 75% by mass in consideration of strength and workability. .

Examples of the resin constituting the long fiber reinforced resin include thermoplastic resins such as polypropylene (PP), polybutylene terephthalate (PBT), 6-nylon (PA6) and 6.6-nylon (PA66), and epoxy resins. Examples include, but are not limited to, thermosetting resins such as resins, phenolic resins, unsaturated polyester resins, melamine resins, and urea resins.

The thickness of the long fiber reinforced resin layers 60A and 60B is preferably 0.5 mm or more, and more preferably 1 mm or more, in order to secure sufficient strength against primary impact or secondary impact. More preferably, the inner radial end 11A (excluding the rim-side buffer layer 46 and the shock absorbing plate 48 described later) or the outer radial end 11B
It is desirable that the thickness of the non-long fiber reinforced resin layers 62A and 62B (excluding the tire-side buffer layer 50 described later) be as wide as possible without impairing the strength.

Various physical properties desired for the long fiber reinforced resin layers 60A and 60B will be described. Flexural modulus (AST
MD 790 (dry state))
000 MPa, and an Izod impact value (ASTM D256 (dry state)) of 20 k
J / m ² or more, and the heat distortion temperature (1.
It is preferable that the temperature is 150 ° C. or higher (under a load of 82 MPa).

When the thermoplastic resin is used as the resin, examples of the molding method of the long fiber reinforced resin layers 60A and 60B include stamping molding, thermoforming, and deep drawing molding. If you use
Examples include molding methods such as SMC molding, autocrepe molding, cast molding, and hand lay-up molding, but are not limited thereto.

Next, the other portion 62A of the radial inner end 11A, the other portion 62B of the radial outer end 11B, and the non-long fiber reinforced resin constituting the wall 11C will be described in detail. .

As the non-long fiber reinforced resin, among the fiber reinforced resins, a so-called short fiber reinforced resin having a short fiber length, and various other non-fiber fillers (whisker, calcium, etc.) are used. Reinforced resin and the like. Among the non-long fiber reinforced resins, short fiber reinforced resins are preferable because they have high workability and high strength.

The above short fiber reinforced resin refers to a fiber reinforced resin having a fiber length of less than 1 mm, and preferably 0.5 mm or less in order to improve workability. . On the other hand, the lower limit of the fiber length is not limited as long as it is equal to or longer than the length at which the reinforcing effect is exhibited (critical fiber length).

The thickness of the fiber contained in the short fiber reinforced resin is not particularly limited, and is preferably in the range of about 1 to 50 μm in consideration of strength and workability.
It is more preferable to set the range to about 20 μm. The types of fibers contained in the short fiber reinforced resin include glass fiber (GF), carbon fiber (CF),
Examples include, but are not limited to, organic fibers such as aramid fibers.

The fiber content of the short fiber reinforced resin is preferably 20 to 60 in consideration of strength and workability.
% By mass, preferably 30 to 50% by mass.
It is more preferable to be within the range. Examples of the resin constituting the short fiber reinforced resin include thermoplastic resins such as polypropylene (PP), polybutylene terephthalate (PBT), 6-nylon (PA6), and 6.6-nylon (PA66). However, the present invention is not limited to this.

Various physical properties desired for the short fiber reinforced resin will be described. The flexural modulus (ASTM D790 (dry state)) is preferably 4000 to 16000 MPa, and the Izod impact value (ASTM D2
56 (in a dry state)) is preferably 9 to 25 kJ / m ² , and is preferably 150 ° C. or higher at a heat deformation temperature (at a load of 1.82 MPa).

Other parts 62 of the radial inner end 11A
A and other portions 62 of the radially outer end portion 11B
B and a member composed of the wall 11C (hereinafter simply referred to as “H
Mold member ". The molding method is not particularly limited, but injection molding can be employed since it is made of a material having good workability. As a method for joining the H-shaped member and the long fiber reinforced resin layers 60A and 60B, there are the following three methods as shown in FIG. In FIG. 6, the other portion 62B of the radial outer end portion 11B and the long fiber reinforced resin layer 60B
Is shown as an example, the other portion 62A of the radial inner end 11A and the long fiber reinforced resin layer 6
Of course, the same applies to the joint portion with 0A.

Bonding with Adhesive The portion 62A and the long fiber reinforced resin layer 60A are separately formed in advance, and as shown in FIG. 6A, are directly adhered and bonded using an appropriate adhesive. There is a method to make it.
The adhesive used is not particularly limited, but is preferably a heat-resistant adhesive having a strong adhesive force.

The joining portion 62A and the long fiber reinforced resin layer 60A are separately formed in advance and joined using a third member such as a rivet 70 as shown in FIG. 6B. There is a method to make it. The third member is not limited to the rivet 70, and includes, for example, a combination of a bolt and a nut.

Joining by Physical Fitting As shown in FIG. 6 (C), there is a method in which the portion 62A and the long fiber reinforced resin layer 60A are physically integrated so as to be fitted and joined together. In order to physically join and join them in this way, for example, the long fiber reinforced resin layer 60A is previously formed into a shape as shown in FIG. A method of, for example, injection molding an H-shaped member including the portion 62A in a state of being inserted in the mold is exemplified.

In the present invention, there is no limitation on the joining method between the H-shaped member and the long fiber reinforced resin layers 60A and 60B.
Any method may be used as long as the two can be joined so as not to be easily separated. In addition, for each of the above three methods, bonding can be performed by only one type, but two or more types may be combined as necessary.

In this embodiment, the radial inner end 11
An impact buffer plate (protective layer) 48 is provided on the inner peripheral surface of A (on the long fiber reinforced resin layer 60A) via a rim-side buffer layer (second buffer layer) 46.

The rim-side buffer layer 46 is a sheet-like elastic body having a constant thickness (T1) and the same width (W1) as the radial inner end 11A. The elastic body may be any material as long as it has a softer elasticity than the non-long fiber reinforced resin, and may be a synthetic resin material other than rubber. The rubber hardness (JIS A) of the rim-side buffer layer 46 is 60 to 80.
Degree is preferred. Thickness T1 of rim-side buffer layer 46
Is preferably 0.5 mm or more, and 1.0 mm
The above is more preferred.

The kind of rubber constituting the rim-side buffer layer 46 is not particularly limited, but natural rubber (NR), polybutadiene rubber (BR), isoprene rubber (IR), styrene butadiene copolymer rubber (SBR), butyl rubber ( IIR),
Halogenated butyl rubber (X-IIR), ethylene propylene diene copolymer rubber (ERGM), urethane rubber and the like are preferable.

The shock absorbing plate 48 has a constant thickness (T
In 2), the metal plate has the same width as the rim-side buffer layer 46. The metal constituting the shock absorbing plate 48 is preferably iron, stainless steel, or the like, and the thickness T2 is preferably 0.5 mm or more, and more preferably 1.0 mm or more.

In the present invention, the rim side buffer layer (rubber) 2
Numeral 0 is preferably vulcanized and bonded to the inner peripheral surface of the radially inner end 11A of the core assembly 10 and the shock absorbing plate 48.

The tire core assembly 10 may be rotatably fitted to the rim 14 so that the shock absorbing plate 48 comes into contact with the outer peripheral surface of the well portion 14A of the rim 14 and slides. .

In this embodiment, the radial outer end 11
A tire-side buffer layer (first buffer layer) 50 is provided on the outer peripheral surface of B (on the long fiber reinforced resin layer 60B). The tire-side buffer layer 50 is a sheet-like elastic body having a constant thickness (T3) and the same width (W2) as the radially outer end 11B.
The elastic body may be any material as long as it has a softer elasticity than the non-long fiber reinforced resin, and may be a synthetic resin material other than rubber.

The rubber hardness (JIS) of the tire side buffer layer 50
A) is preferably from 60 to 80 degrees. The thickness T3 of the tire-side buffer layer 50 is preferably 10 mm or more, more preferably 15 mm or more, and further preferably 20 mm or more.

The type of rubber constituting the tire side buffer layer 50 is not particularly limited, but natural rubber (NR), polybutadiene rubber (BR), isoprene rubber (IR), styrene butadiene copolymer rubber (SBR), butyl rubber ( II
R), halogenated butyl rubber (X-IIR), ethylene propylene diene copolymer rubber (ERGM) and the like are preferable.

In the present invention, the tire side buffer layer (rubber)
24 is preferably vulcanized and bonded to the radially outer end 11B of the core assembly 10.

The tire core assembly and the tire rim assembly of the present embodiment are configured as described above.

(Operation) Next, the operation of the present embodiment will be described. During normal running, the tire core assembly 10 of the present embodiment rotates integrally with the rim 14 due to friction between the impact buffer plate 48 at the radially inner end 11A and the well 14A of the rim 14. I have.

When the internal pressure of the tire 12 decreases due to a puncture or the like, the tire 12 is crushed on the ground contact side, as shown by a two-dot chain line in FIG. 1, and the inner surface 18A of the crown portion 18 is located outside the radial direction of the tire core assembly 10. The end portion 11B comes into contact with the tire-side buffer layer 50.

At this time, the tire core assembly 10 supports the tire 12 from the inside, suppresses its collapse, and allows the tire 12 to run in a state where the internal pressure is low. When the shock absorbing plate 48 comes into contact with the outer peripheral surface of the well 14A of the rim 14 and the tire core assembly 10 is rotatably fitted to the rim 14, the tire 12 14A of the rim 14 due to the force given by the
Slip over and spin. In this case, the well portion 1 of the rim 14
Since the metal impact buffer plate 48 of the tire core assembly 10 comes into contact with 4A, the wear of the tire-side buffer layer 50 is prevented.

In the tire core assembly 10 of the present embodiment, the force input from the tread side of the tire 12 by run flat running is absorbed by the tire side buffer layer 50 and the rim 1
Since the force input from the fourth side is absorbed by the rim-side buffer layer 46, the durability is improved as compared with the related art, and the vehicle can run at high speed.

Tire-side buffer layer 50 and rim-side buffer layer 4
6 is vulcanized and bonded, the durability against the force and frictional heat input during run flat running is superior to the bonding with an adhesive.

Further, when a large impact is applied, such as when the vehicle gets over a large step or a projection on a road surface at a high speed, the tire-side buffer layer 50 and the rim-side buffer layer 46 reduce the impact. A large primary impact is applied to the radially outer end 11B of the core assembly 10 via the tread 12. This primary impact is applied to the wall 11 of the core assembly 10.
C acts between the radially inner end 11A of the core assembly 10 and the well 14A of the rim 14, and this time a large secondary impact is applied to the radially inner end 11A of the core assembly 10. Is added.

As described above, when a large step or a protrusion on the road surface is overcome at a high speed, the primary impact and the secondary impact are applied to the radial outer end 11B and the radial inner end 11A of the core assembly 10. According to the present embodiment, the impact is applied, but according to the present embodiment, the radially outer ends 11B and 2
Since the extremely strong long fiber reinforced resin layers 60B and 60A are formed at the radially inner end 11A to which the next impact is applied, even if a large impact is applied, the layer is not easily broken, and the vehicle travels safely and at high speed. Becomes possible.

Further, a layer made of a long-fiber reinforced resin having low workability is formed only on the radial inner end 11A and the radial outer end 11B, for which an improvement in strength is really desired and the shape is not complicated, Other places with complicated shapes (H-shaped members)
Is made of a non-long fiber reinforced resin having good workability, so that a desired high-strength core assembly 10 can be provided easily and at low cost.

Although the present invention has been described with reference to the preferred embodiments and the drawings, the present invention is not limited to the above embodiments. That is, in the above embodiment, the rim-side buffer layer (second buffer layer) 46, the impact buffer plate (protective layer) 48, and the tire-side buffer layer (first buffer layer) 50 are only optional elements. The scope of the present invention also includes configurations that do not have these. The reinforcing rib 11D is, of course, an additional element.

In this embodiment, the long fiber reinforced resin layer 60A and the long fiber reinforced resin layer 60B are formed at both the radial inner end 11A and the radial outer end 11B, respectively. In the present invention, it is only necessary that the long fiber reinforced resin layer is formed on any one of them.

According to the study of the present inventors, the secondary impact is generally larger than the primary impact, and the inner radial end 11A subjected to the secondary impact is cracked and the outer radial end 11B is formed.
Often grows. Therefore, it is particularly preferable that the long fiber reinforced resin layer 60A is formed on the radial inner end 11A, and the long fiber reinforced resin layers 60A, 60 are formed on both the radial inner end 11A and the radial outer end 11B.
Those in which B is formed are most preferred.

[0076]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. Example 1 A tire core assembly and a tire rim assembly having the structures shown in FIGS. 1 to 5 were manufactured. However, the rim side buffer layer 46 and the impact buffer plate 48 were not formed. Specifically, a core assembly was manufactured as follows, and a tire rim assembly was also manufactured.

(1) Each of the long fiber reinforced resin layers 60A and 60B is formed so as to have the shape shown in FIG.
It was produced by stamping molding. At this time, the thickness of the long fiber reinforced resin layer 60A was 4 mm, the width W1 was 40 mm, the thickness of the long fiber reinforced resin layer 60B was 3 mm, and the width W2 was 60 mm. The used long fiber reinforced resin is TEXXES-II (GF / PA6 type R) manufactured by Nitto Boshoku Co., Ltd., and details thereof are as follows.

-Fiber to be contained: glass fiber (GF)-Resin to be contained: 6-nylon (PA6)-State of fiber: random mat-Glass fiber (GF) content: 67% by mass-Glass fiber (GF) Length: 10 mm Thickness of glass fiber (GF): about 10 to 15 μm

(2) Next, the obtained long fiber reinforced resin layers 60A and 60B are inserted into a mold that can be formed into a shape composed of the H-shaped member and the long fiber reinforced resin layers 60A and 60B as a whole. Then, injection molding was performed using a short fiber reinforced resin. At this time, the overall size was as follows.

The thickness (T4) of the radial inner end 11A: 8 mm The thickness (T5) of the radial outer end 11B excluding the tire-side buffer layer 50: 6 mm The radial length of the wall 11C (L1): 44 mm ・ Thickness (T6) of wall 11C: 2 mm

The short fiber reinforced resin used was BASF
Ultramid A3WG10 manufactured by
It is as follows. -Fiber to be contained: glass fiber (GF)-Resin to be contained: 6.6-nylon (PA66)-Content of glass fiber (GF): 50% by mass-Length of glass fiber (GF): 0.1 mm Thickness of glass fiber (GF): about 10 to 15 μm

(3) Further, the hardness (JIS A) is 70
, Natural rubber (NR) having a thickness T3 of 20 mm is vulcanized and bonded onto the long fiber reinforced resin layer 60B, and the tire side buffer layer 5
0 was formed.

(4) Further, reinforcing ribs (height T7:
2 mm), and other assembled parts such as washers 36, pins 40, bolts 42, nuts 44, etc. were prepared to obtain a precursor of a core assembly.

(5) The obtained core assembly precursor is assembled as described in the embodiment of the present invention with reference to FIGS. 2 to 4 to obtain a tire core assembly and a tire rim assembly. Manufactured. Details of each member are as follows.・ Tire size of tire 12: 225 / 55R17 ・ Rim size of rim 14: 7JJ-17

(Comparative Example 1) In Example 1, the molding of the shape comprising the H-shaped member and the long fiber reinforced resin layers 60A and 60B was performed by using the Ultramid A3WG1 manufactured by BASF.
The tire core assembly and the tire rim assembly were manufactured in the same manner as in Example 1 except that the injection molding was performed integrally using only 0.

(Impact Resistance Test) The obtained tire rim assemblies of Example 1 and Comparative Example 1 were mounted on an actual vehicle (displacement: 40).
00cc class, axial load: 570k per tire
g) and subjected to an impact resistance test. In the impact resistance test, the inner pressure of the tire is set to zero, the height is 50 mm, the width in the traveling direction of the car is 100 mm, and the width in the direction perpendicular to the traveling direction of the car is over the obstacle of a rectangular parallelepiped larger than the width of the tire. went. The evaluation was performed by measuring the maximum speed at which the core assembly could be overcome without breaking.

As a result, 80 km / h was obtained in Example 1 and 60 km / h in Comparative Example 1, indicating that the strength of the tire core assembly and the tire rim assembly of Example 1 was extremely high.

[0088]

As described above, according to the present invention,
When the internal pressure of the tire decreases due to puncture,
If you get over a large bump or bump on the road at high speed,
A tire core assembly and a tire rim assembly that are not easily broken even when subjected to a large impact and that can safely and at high speed can be obtained easily and at low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a tire to which a core assembly for a tire according to an embodiment of the present invention is mounted, taken along a tire axial direction.

FIG. 2 is a side view showing a tire core assembly according to one embodiment of the present invention.

FIG. 3 is a side view of the arc-shaped body.

FIG. 4 is a sectional view of a connecting portion of the arc-shaped body.

FIG. 5 is a cross-sectional view of the tire core assembly of one embodiment of the present invention, taken along the tire axial direction.

FIG. 6 is a partial cross-sectional view cut along the tire axial direction, showing an example of a method of joining an H-shaped member and a long fiber reinforced resin layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tire core assembly 11 Arc-shaped body 11A Radial inner end 11B Radial outer end 11C Wall 11D Reinforcement rib 12 Tire 14A Well 14 Rim 18 Crown part 46 Rim-side buffer layer (second buffer layer) 48 Impact buffer plate (protective layer) 50 Tire-side buffer layer (first buffer layer) 60A, 60B Long fiber reinforced resin layer

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kunio Machida 1-20-11 Igusa, Suginami-ku, Tokyo (72) Inventor Tomohisa Nishikawa 3-5-515 Ogawa Higashicho, Kodaira-shi, Tokyo

Claims (8)

[Claims] At least a radially inner end fitted into a well of a rim, a radially outer end contacting an inner surface of a crown when the tire is collapsed due to a decrease in internal pressure, and a radially upright radius A radially inner end and / or a radially outer end, wherein a ring-shaped tire core assembly formed integrally with a wall body connecting the radially inner end and the radially outer end. A long fiber reinforced resin layer is formed on the portion, and the other portions of the radially inner end portion and the radially outer end portion, and the wall body are made of a non-long fiber reinforced resin. Child assembly. 2. The tire core assembly according to claim 1, wherein the non-long fiber reinforced resin is a short fiber reinforced resin. 3. The method according to claim 1, wherein a first buffer layer made of an elastic material that is more flexible than the non-long fiber reinforced resin is further provided on the outer end in the radial direction. Core assembly for tires. 4. The rubber hardness (JIS) of the first buffer layer
A) is 60 to 80 degrees.
A core assembly for a tire according to item 1. 5. A second buffer layer made of an elastic material which is more flexible than the non-long fiber reinforced resin is provided at the radially inner end, and a protective layer is provided on the second buffer layer. The tire core assembly according to any one of claims 1 to 4, wherein: 6. The rubber hardness (JIS) of the second buffer layer
A) wherein A) is between 60 and 80 degrees.
A core assembly for a tire according to item 1. 7. The tire core assembly according to claim 5, wherein the protective layer is made of a metal material. 8. A rim, a tire mounted on the rim,
A tire rim assembly comprising: a tire core assembly fitted outside a well portion of the rim; wherein the tire core assembly according to any one of claims 1 to 7. A tire rim assembly, which is a core assembly for a tire.