JP2004142487A - Run-flat core of easy-to-insert nature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an integrally formed run-flat core of easy-to-insert nature in which an insertion characteristic into a tire is improved. <P>SOLUTION: The run-flat core 1 equipped with easy-to-insert nature is formed from six or more blocks coupled together using soft coupling pieces 3 into a ring shape or a band shape formed by cutting the ring in one place and spreading, and the core 1 in the form of a band or an arc of circle formed by cutting the ring in 1-5 places and spreading is put in practical application in such a way that it is inserted into the tire 2 and the cut places are coupled together, which assures an easy-to-insert characteristic. The use of soft coupling pieces improves the inserting easiness of the consolidated type core into the tire. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure of a run-flat core having good insertability into a tire.
[0002]
[Prior art]
recent years,
I. Reduced vehicle weight and energy by eliminating the use of spare tires and tools.
B. Expansion of vehicle interior space by eliminating the use of spare tires and tools.
C. Ensuring security of crew during banking. (Traffic safety, crime prevention)
D. For those who cannot change tires (disabled, women, elderly).
For such purposes, various run flat tires (tires that can run as they are even when punctured) have been developed and are beginning to spread.
Run-flat tires have a "core type" that inserts a core into the tire to support the vehicle weight during puncturing, and a "side wall reinforced type" that reinforces the tire's side walls to prevent the tire from being greatly deformed even during puncturing. There is.
SUMMARY OF THE INVENTION The present invention is directed to a new core configuration that improves the weaknesses of previously used core runflat tires.
Conventionally, in the core type,
A. Integral core ... one core per wheel B. Split-type cores: There are two types of cores per wheel.
B. Divided cores have long been used in vehicles that require a run-flat function, such as military vehicles and ambulances. However, the conventional one is designed to emphasize functions. Usually, each core is fixed to a rim. Further, there are problems such as a complicated mounting structure, high mass, high cost, difficulty in assembling, and the like, and they are hardly used in ordinary vehicles.
A. In recent years, an integrated core has been proposed in a new form by a specific tire maker, and has been mounted on a general car. However, because these integrated cores are difficult to insert into tires, they use specially shaped tires and wheels or require special assembling machines and tools. Also, the core of the required height can be inserted into the tire only in the case of a flat tire, and the flatness (aspect ratio) of the tire is 50% or less. (For example, JP-A-8-118903)
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. HEI 8-118903
[Problems to be solved by the invention]
The problems of the integrated core can be summarized as follows.
{Circle around (1)} The core cannot be inserted into the tire as it is (FIG. 19).
The outer diameter of the core 1 needs to be larger than the inner diameter of the tire 2 to receive the vehicle weight during puncturing. Therefore, it cannot be inserted into the tire as it is.
(2) Even if the core has a flexible structure, the core can be inserted only into a super-flat tire having an aspect ratio of 35% or less.
As shown in FIG. 20, when the core 1 is made to have a flexible structure and is deformed into an elliptical shape as required to be inserted into the tire 2, it cannot be inserted with a standard tire. Is not more than 35% or less.
(3) If the inside diameter of one side of the tire 2 is made larger than the inside diameter of the other side (FIG. 21) and the core 1 is inserted from the larger inside diameter, the tire 2 can be inserted more easily than in the case of (2). Although it is possible, it can be inserted only in the case of a flat tire having an aspect ratio of 50% or less.
Summarizing the problems of (1), (2), and (3) above, the integrated core can be inserted into the tire by making it flexible or expanding the inside diameter of one side wall of the tire. Still, it can only be inserted into a tire for flat tires and not for standard tires.
{Circle around (4)} Further, the conventional core type system has the following problems.
I. Flat tires have low anti-vibration and noise-proof functions and have problems in ride comfort and road noise.
B. Flat tires have a large wheel diameter, high mass, and high cost.
C. Wheels and tires are specially designed and are not compatible with conventional wheels and tires.
[0005]
An object of the present invention is to improve the insertability of an integrated core into a tire, to enable mounting on an ordinary tire that is not particularly flat, and to achieve the above-mentioned (4) that a conventional core system has. Integral type that can reduce the problems and has good insertability into the tire (including the case where the blocks of the split type core are connected in advance to form a band or an arc into the tire are also included in the integrated type core. ) To provide run-flat cores.
[0006]
[Means for Solving the Problems]
(1) A run flat with good insertability, in which the core is composed of six or more resin blocks and connected to a ring-shaped or a belt-shaped shape that has been developed by cutting the ring at one place using a flexible connector. Nakako.
(2) The connector for connecting the blocks is a pin-type connector having a pin and a pin hole, and a margin is provided for the difference between the pin diameter and the pin hole diameter of the pin-type connector so that the movement of the core connecting portion can be flexibly performed. A run-flat core having good insertability according to (1).
(3) The run-flat core according to (1), wherein the connector for connecting the blocks has a hook-type connector having a hook and a hook receiving portion.
(4) A run-flat core having good insertability, in which a band-shaped or arc-shaped resin core developed by cutting an annular shape at one or more locations and no more than five locations is used after connecting the cut locations after insertion into a tire.
(5) The run-flat core according to (4), wherein the connector for connecting the belt-shaped or arc-shaped core is an inverting connector having two hinge bolts, and one of the hinge bolts is detachable.
(6) A buckle-type connector for connecting a band-shaped or arc-shaped core to a U-bar fixed to a partner core with a rotary hook, rotating the hook, and connecting and tightening the cores. The run-flat core having good insertability according to (4).
[0007]
In the run-flat core of the above (1), the insertability into the tire is improved by using the flexible connector.
Since the run-flat core of the above (2) is a pin-type connector, the flexibility of the connector is ensured by increasing the fitting gap between the pin and the pin hole.
In the run flat core of the above (3), since the hook type connector is used, the flexibility of the connector is ensured.
In the run-flat core of the above (4), the core is inserted into the tire in a belt-shaped or arc-shaped state in which the annular shape is cut at one or more and five or less locations, and the insertability into the tire is improved. Good.
In the run-flat core of the above (5), since the connector is an inverted connector having two hinge bolts, after the core is mounted on the tire, the connection of the cut portion of the core and the core can be easily performed. Can be performed both.
In the run flat core of the above (6), since the connector is a buckle type connector, after the core is mounted on the tire, both the connection of the cut portion of the core and the tightening of the core are easily performed. be able to.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
A run-flat core of the present invention with good insertability ("run-flat core" is also simply referred to as "core") will be described with reference to the drawings.
As described above, if the core is an integral type, it is very difficult to insert the core into the tire with the conventional core structure. As shown in FIG. 21, the inner diameter of one side of the tire 2 is smaller than the inner diameter of the other side. The only option was to insert the core 1 from the larger inner diameter.
However, tires and wheels have a special shape and are not compatible with ordinary tires and wheels.
Therefore, "a core that has a more flexible structure and is three-dimensionally deformed and inserted into a tire (a core corresponding to claims 1 to 3 and the first and second embodiments)" and "one of the cores" The core (corresponding to claims 4 to 6, and the cores according to the third and fourth embodiments) that cuts the part to make it easy to insert the core is invented.
[0009]
Example 1 Chain type core In order to make the core more flexible, a chain type connection is adopted. As shown in FIG. 1, the core 1 is divided into a plurality of (about 6 to 15) resin block cores, made into a ring, and used in a ring (annular core). The above-described split core is different from the split core in that the blocks are inserted in advance into the tire 2 with the idea of a "snake" of a toy as shown in FIG. In this case, if the connector 3 is made to have a flexible structure, for example, by increasing the gap between the pin and the pin hole, the whole is deformed much more freely than the conventional integrated core, and the method of deforming the connector 3 becomes much more flexible. The possibility of being able to be inserted into the tire 2 by devising increases. According to experiments, this method allows a core having a required height to be inserted into a tire having an aspect ratio of 50% or less. In the case of the chain type, the structure of the connector 3 is made simple and lightweight by preventing the connector 3 from having tension when the core 1 is fastened to the wheel rim. Tension retention should be performed by another system such as a belt.
[0010]
The structure of the connector 3 is, from the viewpoint of ease of production, ease of connection through a small gap between the tire and the core after tire insertion, and flexibility of the connection portion, the following pin method, hook System.
[0011]
(A) Pin method (Fig. 4)
The pin method is advantageous in terms of cost because it is easy to make with a simple structure and a ready-made pin can be used. In addition, the flexibility of the connecting portion can be adjusted by providing a margin in the pin hole (enlarging the gap between the pin and the pin hole).
As a desirable structure of the pin, as shown in FIG.
(A) Stop pin 4: After insertion, the spring expands and stops.
(B) Stop pin 5: After insertion, the end is plastically deformed (caulked) and stopped.
(C) Split pin 6: After insertion, bend the tip and stop.
Use any of
[0012]
(B) Hook method (Figs. 5 and 6)
This is a method of connecting using hooks 7 and 8 which are integrally molded or incorporated into the main body without using pins.
Although the ease with which the body can be made is slightly worse, the effort involved in connecting to a chain shape becomes easier.
The hook includes a resin hook 7 and a metal hook 8.
Resin hook 7 (FIG. 5): When the core body is made of resin, if a hook is formed in a part of the resin, no additional parts are required, which is advantageous in cost.
Metal hook 8 (FIG. 6): A ready-made hook 8 is screwed into the core 1 for use.
[0013]
Second Embodiment A chain-shaped (open type) core block-shaped core 1 is not connected to form an annular shape, but is formed into a linear long chain with an open one. Furthermore, the insertability into the tire 2 is significantly improved (FIG. 7).
According to an experiment, the core 1 having a required height can be inserted into the tire 2 having any flatness by using this method.
After insertion into the tire 2 (FIG. 8), both ends of the chain need to be joined in a narrow place in the tire 2, so that the joining method requires some contrivance. The (A) pin method and the (B) hook method of the first embodiment can easily be connected in a narrow place, and can be used for connecting the end of the core 1 of the second embodiment.
[0014]
Example 3 The insertability into the tire 2 can be improved by devising an integrally formed core instead of connecting block-shaped cores like an open core chain type. Here, the case of the core 1 as shown in FIG. 9 in which the integrated resin core 1 is formed in a straight line or an arc shape and both ends are used in combination will be described.
In this method, the integrated core 1 can be inserted into the tire 2 by a method of spirally winding the core 1 up to a tire 2 having an aspect ratio of 50% (FIG. 17).
Unlike the first and second embodiments, the connector 3 needs to be capable of performing not only “connection” but also “tightening”.
Therefore, the structure of the connector 3 as shown in the following (C) and (D) is required.
[0015]
(C) Link / reverse link method (FIGS. 10 to 13)
The connecting / reversing link type connector 3 has a structure shown in FIG. 10 and can be tightened or loosened by reversing the intermediate connecting / reversing link 9. When the connecting / reversing link 9 is tightened, the pulling force indicated by the arrow in FIG. 10 becomes a torque in the direction of tightening the link, so that the link 9 is not loosened. When loosening is desired, a reverse moment is applied to the intermediate link 9 to loosen it.
The connecting / reversing link has a structure shown in FIGS. 11 and 12, and one of the two hinge bolts 10 is detachable. When the core 1 is inserted into the tire 2, the core 1 is removed (state in FIG. 11), and after the core 1 is inserted into the tire 2, the core 1 is connected (state in FIG. 12). In the illustrated example, the nut is fixed. However, the nut may be fixed by another method.
The tightening of the connector 3 is performed according to the procedure of FIG. 13 (the procedure of (A), (B), (C), and (D) of FIG. 13). Assuming that the length between the hinges of the intermediate connecting / reversing link 9 is d, the mounting length that can be adjusted by this method is about 2d.
The core tightening tension is determined by the position of attachment to the core 1 of the connecting / reversing link 9.
[0016]
(D) Buckle type (Figs. 14 and 15)
The buckle type connector 3 has a structure shown in FIG. 14 and hooks a U bar 11 fixed to the other party with a rotary hook 12 to connect the core 1. Thereafter, the hook 12 is rotated to draw the other party, and the tightening force is adjusted. Finally, the rotation of the hook 12 is restrained by the locking bar 13.
FIG. 15 shows the procedure. This method is easier to connect than the (C) connection / reversal link method, but has a small adjustable stroke.
[0017]
Example 4 Two-segmented core (resin core divided into fewer than five parts, typically taking two parts as an example, but up to five parts may be used)
A method of improving the insertability by making the core 1 not a one-piece but a two-piece, that is, a two-piece, will be described. If this method is used, the core 1 can be inserted into the tire 2 of any size as shown in steps 1 to 9 in FIG.
In the case of the open core according to the third embodiment, a counterweight is necessary because the connector 3 has an imbalanced weight, but the counterweight is not required in the case of a two-piece core. In the case of three to five divisions, the length of each block is the same.
However, there is a problem that the number of parts increases due to the division, and the cost, mass, assembling man-hours, and the like increase.
FIG. 16 shows the concept. The connector 3 needs "connection" and "tightening", and uses the same connector as in the third embodiment.
[0018]
【The invention's effect】
According to the run flat core of the first aspect, the use of the flexible connector can improve the insertability of the integrated core into the tire.
According to the run flat core of the second aspect, since the connector is a pin type, the flexibility of the connector can be ensured by increasing the fitting gap between the pin and the pin hole.
According to the run-flat core of the third aspect, since the connector is a hook type, flexibility of the connector can be secured.
According to the run-flat core of the fourth aspect, the core is inserted into the tire in a belt-shaped or arc-shaped state in which the ring is cut at one or more and five or less places and expanded, and the core is connected after insertion. The insertability of the core into the tire can be improved.
According to the run flat core of the fifth aspect, since the connector is an inverted connector having two hinge bolts, the "connection" of the cut portion of the core and the core after the core is mounted on the tire. Can be performed, and "connection" and "tightening" can be easily performed.
According to the run-flat core of claim 6, since the connector is a buckle type connector, after the core is mounted on the tire, both the "connection" of the cut portion of the core and the "tightening" of the core are performed. And “connection” and “tightening” can be easily performed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a tire and a chain-type core tire inserted into the tire according to Example 1 of the present invention.
FIG. 2 is a perspective view showing how to insert a core into a tire according to the first embodiment of the present invention.
FIG. 3 is a sectional view of a core and its connector according to the first embodiment of the present invention.
FIG. 4 is a sectional view of a stop pin 4, a stop pin 5, and a split pin 6 of the connector according to the first embodiment of the present invention.
5A and 5B show a hook type connector according to the first embodiment of the present invention, wherein FIG. 5A is a sectional view of a core and a resin hook, and FIG. 5B is a plan view of the resin hook.
FIG. 6 shows a hook type connector according to the first embodiment of the present invention, wherein (a) is a cross-sectional view of a core and a metal hook, and (b) is a plan view of the metal hook.
FIG. 7 is a side view of a chain-type open core in which a plurality of blocks are connected according to a second embodiment of the present invention.
FIG. 8 is a cross-sectional view of a tire and a core when a chain-type open core is inserted into the tire according to the second embodiment of the present invention.
FIG. 9 shows an open-type integrated core according to a third embodiment of the present invention. FIG. 9 (a) is a front view in a state where the core is developed in a belt shape, and FIG.
FIG. 10 is a cross-sectional view of a connecting / reversing link type connector for connecting an open integral core according to a third embodiment of the present invention.
FIG. 11 is an exploded view of a connecting / reversing link type connector according to a third embodiment of the present invention, where (A) is a side view and (B) is a plan view.
12A and 12B are assembly views of a connection / reversal link type connector according to a third embodiment of the present invention, wherein FIG. 12A is a side view and FIG. 12B is a plan view.
FIG. 13 is an operation state diagram showing open, parallel, and fastening states of the connecting / reversing link type connector according to the third embodiment of the present invention.
14A and 14B are buckle-type connectors according to a third embodiment of the present invention, wherein FIG. 14B is a side view, FIG. 14A is a cross-sectional view taken along line AA of FIG. It is B sectional drawing.
FIG. 15 is a cross-sectional view showing each step from the start to the completion of tightening of the buckle connector according to the third embodiment of the present invention.
16A and 16B show a two-piece core according to a fourth embodiment of the present invention, wherein FIG. 16A is a side view of a belt-shaped core, FIG. FIG. 3 is a cross-sectional view of a state in which is inserted into a tire.
FIG. 17 shows how to insert the core into the tire according to the third embodiment of the present invention. FIG. 17 (a) is a cross-sectional view showing a state where the core is wound and inserted into the tire, and FIG. The figures are shown respectively.
FIG. 18 shows how to insert the core of the third embodiment of the present invention into a tire, and in the figure, 1 to 9 show the process numbers.
19A and 19B show a general integrated core and a tire, wherein FIG. 19A is a cross-sectional view showing a state in which the core is inside the tire, and FIG. Are respectively shown.
FIG. 20 is a cross-sectional view of the tire and the core, showing the order of steps in a case where the core is made flexible and the core is deformed into an oval shape and inserted into the tire.
FIG. 21 is a cross-sectional view of a tire and a core in a case where the inner diameter of one side wall of the tire is expanded and a core is inserted into the tire in a general core.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Core 2 Tire 3 Connector 4 Stop pin 5 Stop pin 6 Split pin 7 Resin hook 8 Metal hook 9 Connecting / reversing link 10 Hinge bolt 11 U-bar 12 Rotary hook 13 Loose stop bar

Claims (6)

A run-flat core with good insertability, in which the core is composed of six or more resin blocks, and is connected to an annular shape or a band shape obtained by cutting the ring at one place and using a flexible connector. The connector for connecting the blocks is a pin-type connector having a pin and a pin hole, and a margin is provided between the pin diameter and the pin hole diameter of the pin-type connector to make the movement of the core connecting portion flexible. 2. The run-flat core according to 1 having good insertability. 2. The run-flat core according to claim 1, wherein the connector for connecting the blocks has a hook type connector having a hook and a hook receiving portion. A run-flat core having good insertability, in which a band-shaped or arc-shaped resin core obtained by cutting and expanding a ring at one or more and five or less locations is used by connecting the cut locations after being inserted into a tire. 5. The run-flat core according to claim 4, wherein the connector for connecting the belt-shaped or arc-shaped core is an inverting connector having two hinge bolts, and one of the hinge bolts is detachable. A buckle-type connector for connecting the belt-shaped or arc-shaped core, wherein the U-bar fixed to the partner core is hooked by a rotary hook, and the hook is rotated to connect and tighten the cores. 4. A run-flat core according to 4 which has good insertability.

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