JP2006008063A - Run flat core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a run flat core in which melting damage and softening by friction heat are hardly generated. <P>SOLUTION: (1) The run flat core 1 has a core block connection body 10 having a plurality of core blocks 11 connected to each other in a wheel circumferential direction and fastened to a wheel 2 by a belt 40 wherein the respective core blocks of the plurality of core blocks are made of plastic, and having a shape having a box 14 in which at least one surface of an upper surface and a lower surface is released and a lattice plate 15 provided in the box for reinforcement; and a ceiling plate 50 formed in a separate piece from the core blocks and mounted to the upper surface of the respective core blocks. (2) The ceiling plate 50 is made of metal. (3) The lattice plate 15 of the core block 11 and walls 16 of front and rear ends of the box 14 radially extend relative to a center 6 of the wheel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a so-called “run flat system” that can travel a certain distance even when air loss (when tire pressure decreases) or puncture, and is a run flat core that is mounted in the tire and on the outer periphery of the wheel rim. About.

As shown in FIG. 35 (conventional example), Japanese Patent Application Laid-Open No. 2003-341111 filed by the present applicant has a plurality of core blocks 101 connected to each other in the wheel circumferential direction and pressed against the wheel. Each core block of the plurality of core blocks is made of plastic, and has a box 104 whose upper surface 102 is closed and a lower surface 103 is opened, and a lattice plate 106 provided for reinforcement in the box 105. A core block assembly having a different shape is disclosed. The lattice plate 106 and the walls 107 at the front and rear ends of the box are parallel to each other in consideration of product removal from the mold.
JP 2003-341111 A

However, the above structure has the following problems to be solved.
(B) Melting and softening due to frictional heat.
At the time of puncture, the ground contact portion of the tire 110 is flat along the road surface, and the outer periphery of the core block 101 is cylindrical, so that the contact portion 111 between the core block 101 and the tire 110 is narrow. Then, since sliding with a difference in diameter occurs between the tire 110 and the core block 101, frictional heat is generated in the narrow contact portion 111 to create a local temperature rise point). When the temperature of the heat spot reaches the heat resistance temperature (120 ° C. to 160 ° C.) of the plastic core block 101, the core block 101 is melted and softened, which becomes the durability limit.
(B) The gap between the core blocks is large or has a hooked structure.
The gap 108 between the core blocks 101 is opened, and the vehicle vibration at the time of puncturing is deteriorated.
Further, in order to close the gap 108 between the core blocks 101, it is effective to attach flanges 109 to the front and rear ends of the core block 101 as shown in FIG. 36 (comparative example, but not the conventional example). However, the ridge 109 has a “cantilever” structure and is structurally weak.
(C) A structure that receives vertical load on an oblique wall.
At the front and rear ends of the core block 101, the load direction is oblique to the direction of the wall 107, and the load cannot be received in the wall extension direction, which is disadvantageous in strength. This is a hard structure at heavy loads.

The above problems are solved by the following means of the present invention.
(1) A plurality of core blocks connected to each other in the circumferential direction of the wheel and fastened to the wheel by a belt, each core block of the plurality of core blocks being made of plastic, and having an upper surface and a lower surface A core block coupling body having a shape with a box opened on at least one of the surfaces and a lattice plate provided for reinforcement in the box;
A top plate attached to the upper surface of each core block as a separate piece from the core block;
Run-flat core with.
(2) The run-flat core according to (1), wherein the top plate is made of metal.
(3) The run flat core according to (1), wherein the top plate is a heat resistant resin.
(4) The run-flat core according to (1), wherein a lattice plate of the core block and front and rear end walls of the box extend radially with respect to the center of the wheel.
(5) The run-flat core according to (1), wherein the core block has a central groove that extends in a wheel circumferential direction and opens upward, and the top plate covers the central groove of the core block. .
(6) The top plate has a rotation stopper formed by bending one end of the top plate downward, and the rotation stopper is inserted into a gap between two adjacent core blocks to be connected to the core block of the top plate. The run-flat core according to (1), which is a rotation stopper.
(7) The core block has a protrusion, the top plate has a hook that is slidable with respect to the protrusion and holds the protrusion, and the top plate is slid to The run-flat core according to (1), which is assembled to the core block.
(8) The protrusions are formed at the left and right ends of the core block, the hooks are formed at the left and right ends of the top plate, and the top plate is slid in the front-rear direction and assembled to the core block. The run-flat core according to (7).
(9) The protrusion is formed on the core block so as to protrude to the inside of the central groove, the hook is formed at the center of the top plate, and the top plate is slid in the front-rear direction. The run-flat core according to (7), which is assembled to the core block.
(10) The protrusions are formed at the front and rear ends of the core block, the hooks are formed at the front and rear ends of the top plate, and the top plate is slid in the left-right direction and assembled to the core block. The run-flat core according to (7), wherein the run-flat core is retained by a retaining stopper provided on the top plate.
(11) The run-flat core according to (1), wherein a core lashing belt having a coupling / clamping mechanism provided at an end thereof is wound around the core block from the outer peripheral side and pressed against the wheel rim. .
(12) The run-flat core according to (1), wherein a tightening force of the core block to the wheel rim is (R1-R2) W / (nR2) or more. Here, R1 is the core outer diameter, R2 is the rim outer diameter, W is the wheel axle weight, and n is the number of core blocks.
(13) The run-flat core according to (1), which is also attached to a vehicle having an axle load of 7 KN or more.

According to the run-flat core of the above (1), the core block connecting body having a plurality of core blocks fastened to the wheel by a belt, and a separate piece from the core block are attached to the upper surface of each core block. The top plate can be made of a material different from the core block material, and the top plate material is less susceptible to heat damage than the core block material. This prevents or suppresses the melt damage and softening of the run-flat core due to frictional heat with the tire during puncture. Thereby, the problem (A) is solved.
According to the run-flat core of (2) above, since the top plate is made of metal, it has higher heat resistance, thermal conductivity and heat dissipation than the plastic of the core block, and friction with the tire during puncture Does not melt or soften even when heated. Thereby, the problem (A) is solved.
According to the run-flat core of (3) above, since the top plate is a heat-resistant resin, it has higher heat resistance than the plastic of the core block, and even when subjected to frictional heat with the tire at the time of puncture. Loss and softening. Thereby, the problem (A) is solved.
According to the run-flat core of the above (4), the lattice plate of the core block (the lattice plate extending in the direction perpendicular to the circumferential direction of the wheel) and the front and rear walls of the box of the core block are Since it extends radially with respect to the center, the space between the top plates mounted on two adjacent core blocks cannot be opened. Thereby, the problem (b) is solved.
Further, in this structure, regardless of the rotational position of the wheel, the extending direction of the front and rear end walls of the core block box and the lattice plate is the load direction. Thereby, the problem (c) is solved.
In the structure where the wall of the front and rear ends of the core block box and the lattice plate extend radially, if you try to remove the mold to the outer peripheral side (however, the mold may be pulled to the side), the core block itself The top plate cannot be integrally formed, and the contact surface with the tire becomes small, and the contact portion easily generates heat. However, in the present invention, since the top plate is a separate piece from the core block, the outer surface of the core block can be covered with the top plate regardless of the die removal of the core block. Can be taken widely. Thereby, the heat generation at the contact portion with the tire at the time of puncture can be suppressed. Thereby, the problem (A) is effectively solved.

According to the run-flat core of the above (5), the core block has the central groove, and therefore, the core block can be fastened to the wheel rim by putting a belt on the core block. As a result, slippage between the core block and the wheel rim can be prevented, and vehicle braking and driving torque can be transmitted between the wheel and the tire.
In addition, the core block has a central groove that extends in the circumferential direction of the wheel and opens upward, but since the top plate covers the central groove, the contact area between the tire and the core can be increased, and a heat spot is formed. It is hard to be done.
According to the run-flat core of (6) above, the top plate has a rotation stopper formed by bending one end of the top plate downward, and the rotation stopper is inserted into a gap between two adjacent core blocks. Since it is a rotation stop against the core block of the top plate, the top plate will not rotate with respect to the core block even if rotational torque is applied to the top plate due to sliding with the tire during puncturing. It can stop and transmit the braking and driving torque of the car between the wheel and the tire.

According to the run-flat core of (7) above, the core block has a protrusion, and the top plate has a hook that is slidable with respect to the protrusion and holds the protrusion. Since the top plate is slid and assembled to the core block, the top plate can be assembled and fixed to the core block by “fitting”.
The run-flat cores of (8), (9), and (10) show various aspects of the run-flat core of (7).
According to the run-flat core of the above (11), the core block is wound around the core block with a core / clamping mechanism provided with a coupling / clamping mechanism, so that the belt is separated at the coupling / clamping mechanism part. In a disconnected state, the belt is passed through the central groove of the core block, and after the threading is finished, both ends of the belt are connected by a connecting / clamping mechanism and tightened. Thus, the belt can be passed through the core block connector after the top plate is mounted on the core block.
According to the run-flat core of (12) above, the tightening force of the core block on the wheel rim is set to (R1-R2) W / (nR2) or more, so that the tire bead is fixed to the rim flange portion at the time of puncture. Even in a state where it is not applied, a driving force, a braking force, and a lateral force can be transmitted between the tire, the core, and the wheel by transmitting a force due to friction between the tire back surface and the core.
According to the run-flat core of the above (13), the center groove is covered with the top plate so that a large load is supported by the top plate having a large area, so that the axle load is also mounted on a vehicle having an axle load of 7 KN or more. The run-flat core of the present invention can also be applied to large vehicles such as trucks and buses.

Various embodiments of the run-flat core of the present invention will be described with reference to FIGS.
1 to 9 show a structure common to a first embodiment of the present invention and almost all the embodiments of the present invention.
10 and 11 show a second embodiment of the present invention, FIGS. 12 and 13 show a third embodiment of the present invention, FIGS. 14 and 15 show a fourth embodiment of the present invention, and FIG. 16 shows the present invention. 17 to 21 show Example 6 of the present invention, FIGS. 22 and 23 show Example 7 of the present invention, and FIGS. 24 and 25 show Example 8 of the present invention. 26 to 30 show a ninth embodiment of the present invention, FIGS. 31 to 33 show a tenth embodiment of the present invention, and FIG. 34 shows an eleventh embodiment of the present invention.
Structural parts common to all the embodiments of the present invention are denoted by the same reference numerals throughout the embodiments of the present invention.

[Configuration, operation and effect common to all embodiments of the present invention]
First, structural parts common to all the embodiments of the present invention will be described with reference to FIGS.
The run-flat core 1 of the present invention is mounted on the outer periphery of the rim 3 of the tire lateral loading wheel 2. At the time of mounting, the detachable flange 4 at one end in the width direction of the wheel 2 is removed from the rim 3, the core 1 and the tire are mounted on the rim 3 from the side, and then the detachable flange 4 at one end is mounted on the rim 3.・ Fix it.

The run-flat core 1 of the present invention includes a core block connector 10 and a top plate 50.
The core block connector 10 includes a plurality of core blocks 11 that are connected to each other in the wheel circumferential direction and fastened to the wheel 2 by a belt 40. Each core block 11 of the plurality of core blocks 11 is made of plastic (made of synthetic resin), which is a material that can be injection-molded and easily recycled. Each core block 11 extends in an arc shape in the circumferential direction of the wheel 2 and extends substantially linearly in the wheel width direction. A core block connector 10 in which a plurality of core blocks 11 are connected in series has a length extending around the outer circumference of the wheel rim 3, and each block 11 divides the core block connector 10 into a plurality of parts in the wheel circumferential direction. Has a length. Each core block 11 has a shape having a box 14 in which at least one of the upper surface 12 and the lower surface 13 is opened, and a lattice plate 15 provided in the box 14 for reinforcement. Yes. Since the wall is plate-shaped and the material is plastic, each core block 11 is lightweight and has high strength.

The top plate 50 is a separate piece from the core block 11 and is attached to the upper surface 12 of each core block 11.
Since the top plate 50 is a separate piece from the core block 11, it can be made of a material different from the material of the core block 11. Since the top plate 50 is required to have heat resistance, the top plate 50 is made of a material having higher heat resistance than the material of the core block 11.
For example, the top plate 50 is made of metal. From the viewpoint of weight reduction, the top plate 50 is preferably made of aluminum, magnesium, or an alloy thereof. However, the metal of the top plate 50 is not limited to aluminum and magnesium, and may be steel. In the case of aluminum and its alloys, since it has good thermal conductivity and thermal radiation, it is difficult to form a heat spot even if it contacts / slides with the tire 5 during puncturing, and the run-flat core 1 and the tire 5 Desirable for heat durability.
Moreover, the top plate 50 may be manufactured from a heat resistant resin. In the case of a heat resistant resin, there is an advantage that the top plate 50 can be manufactured by molding and the productivity is higher than that of metal.

The lattice plate 15 of the core block 11 (the lattice plate 15 does not include the vertical leg 15A below the central groove 17) and the wall 16 at the front and rear ends of the box 14 are radial with respect to the center 6 of the wheel. It extends. Since the mold for forming the vertical leg 15A below the central groove 17 is pulled downward, the vertical legs 15A below the central groove 17 are parallel to each other.
When the core block 11 is manufactured, if the core block 11 does not have an upper wall, the mold is pulled out above the core block 11 (outward in the wheel radial direction). When the core block 11 has an upper wall, the mold is pulled out below the core block 11.

The core block 11 has a central groove 17 that extends in the wheel circumferential direction and opens upward. The top plate 50 covers the central groove 17 of the core block 11.
The top plate 50 has a rotation stopper 51 formed by bending one end of the top plate 50 downward. The rotation stopper 51 is inserted into a gap between two adjacent core blocks 11 and serves as a rotation stopper for the core block 11 of the top plate 50.
The core block 11 is formed with a projection 18 projecting in the width direction of the core block 11, and the top plate 50 is formed with a hook 52 slidable with respect to the projection 18 and holding the projection 18. Yes. The top plate 50 is slid and assembled to the core block 11. At the time of assembly, the protrusion 18 and the hook 52 slide.

A core tying belt 40 having a connecting / clamping mechanism 41 at the end is wound around the core block 11 from the outer peripheral side. The belt 40 is passed through a hole formed by the central groove 17 and the top plate 50 of the core block 11 in a single state in which the coupling / clamping mechanism 41 is separated. By applying tension to the belt 40, the core block 11 is fastened to the wheel rim 3 inwardly in the wheel radial direction.
The tightening force of the core block 11 to the wheel rim 3 is (R1-R2) W / (nR2) or more. Here, R1 is the core outer diameter, R2 is the rim outer diameter, W is the wheel axle weight, and n is the number of core blocks.
A vehicle on which the run-flat core 1 of the present invention is attached to a wheel may be a large vehicle such as a bus or a truck having a wheel axle weight of 7 KN or more. This is because the central groove 17 is covered with the top plate 50, and the load is distributed and supported by the top plate 50 having a large area. However, the vehicle to which the run-flat core 1 of the present invention is attached may be a passenger vehicle having a wheel axle weight of less than 7KN.

The operation and effect of the run-flat core configured as described above will be described.
The run-flat core is attached to the upper surface of each core block 11 as a separate piece from the core block coupling body 10 having a plurality of core blocks 11 fastened to the wheel 2 by the belt 40 and the core block 11. Since the top plate 50 is provided, the top plate 50 can be made of a material different from the core block material. Preventing or suppressing melting and softening of the run-flat core 1 due to frictional heat with the tire at the time of puncture by making the material of the top plate 50 less susceptible to heat damage than the material of the core block 11 Can do. Thereby, the problem (A) is solved.

When the top plate 50 is made of metal, the top plate 50 has higher heat resistance, thermal conductivity, and heat dissipation than the plastic of the core block 11, and can receive frictional heat with the tire 5 during puncture. The top plate 50 and therefore the core 1 are not melted or softened. Thereby, the problem (A) is solved.
When the top plate 50 is made of heat-resistant resin, the top plate 50 has higher heat resistance than the plastic of the core block, and the top plate 50 is melted and softened even when subjected to frictional heat with the tire at the time of puncture. Hard to do. Thereby, the problem (A) is solved.

Of the lattice plate 15 of the core block 11, the lattice plate 15 extending in the direction (core width direction) orthogonal to the wheel circumferential direction (core arc extending direction) and the front and rear ends of the box 14 of the core block 11 When the wall 16 extends radially with respect to the center 6 of the wheel 2, the interval between the top plates 50 attached to the two adjacent core blocks 11 cannot be opened. Thereby, the problem (b) is solved.
Further, in the structure in which the front and rear end walls 16 of the core block 11 and the lattice plate 15 extend radially, the front and rear end walls 16 of the box 14 of the core block 11, regardless of the rotational position of the wheel 2, The extension direction of the lattice plate 15 is the load direction. Thereby, the wall 16 and the grid plate 15 at the front and rear ends do not support the load obliquely, and the problem (c) is solved.
In addition, in the structure in which the front and rear end walls 16 and the lattice plate 15 of the core block 11 box extend radially, the top plate can be integrally formed on the core block itself when the mold is pulled out to the outer peripheral side. Therefore, the contact surface with the tire becomes small, and the contact portion easily generates heat. However, in the present invention, since the top plate 50 is a separate piece from the core block 11, the outer peripheral side of the core block 11 can be covered with the top plate 50 regardless of the die removal of the core block. The top plate surface can be taken widely. Thereby, the heat generation at the contact portion with the tire 5 at the time of puncture can be suppressed. Thereby, the problem (A) is effectively solved.

Since the core block 11 has the central groove 17, the core block can be fastened to the wheel rim 3 with a sufficient force by hanging the belt 17 thereon. As a result, slippage between the core block 11 and the wheel rim 3 can be prevented, and vehicle braking and driving torque can be transmitted between the wheel 2 and the tire 5 via the run-flat core 1.
The core block 11 has a central groove 17 that extends in the circumferential direction of the wheel and opens upward, and the area of the upper surface of the core block 11 is reduced. The area of the top plate 50 of the core can be secured widely, and the contact area between the tire 5 and the core 1 can be widened. As a result, it is difficult for heat spots to be formed on the top board 50.

  The top plate 50 has a rotation stopper 51 formed by bending one end of the top plate 50 downward, and the rotation stopper 51 is inserted into a gap between two adjacent core blocks 11 to be inserted into the core block 50 of the top plate 50. 11 is prevented from rotating with respect to the core block 11 even if rotational torque is applied to the top plate 50 due to sliding with the tires 5 during puncture travel. it can. As a result, vehicle braking and driving torque can be transmitted between the wheel 2 and the tire 5.

  The core block 11 is formed with a protrusion 18, and the top plate 50 is formed with a hook 52 that is slidable with respect to the protrusion 18 and holds the protrusion 18. The top plate 50 can be assembled to the core block 11 and fixed by “fitting”.

  Since the core locking belt 40 has the connection / clamping mechanism 41 at the belt end, the belt 40 can be disconnected at the connection / clamping mechanism 41, and the belt 40 is separated from the core block 11 in the disconnected state. After passing through the central groove 17 and finishing the passage, both ends of the belt 40 are connected by the connecting / clamping mechanism 41 and tightened. Thus, the belt 40 can be passed through the core block connector 10 after the top plate 50 is mounted on the core block 11.

Since the tightening force of the core block 11 to the wheel rim 3 is set to (R1-R2) W / (nR2) or more, the back surface of the tire 5 even when the tire bead is not fixed to the rim flange portion 4 at the time of puncture Driving force, braking force, and lateral force can be transmitted between the tire, the core 1 and the wheel 2 by transmitting force due to friction between the core 1 and the core 1.
Since the run-flat core 1 is also attached to a vehicle having an axle load of 7 KN or more, it can be applied to a large vehicle such as a truck or a bus.

Next, a structure peculiar to each embodiment of the present invention and its operation and effect will be described.
[Example 1--FIGS. 1 to 9]
The structure of the first embodiment of the present invention conforms to the structure common to all the embodiments of the present invention described above.
For example, the core block 11 is made of plastic, and the top board 50 is made of aluminum.
A rotation stopper 51 formed at one end of the top plate 50 is sandwiched between adjacent core blocks 11 so that the top plate 50 does not rotate relative to the core block 11. In the left-right direction, as shown in FIG. 4, the relative movement of the top plate 50 with respect to the core block 11 is restricted by holding the projection 18 with the hook 52.
The operations and effects of the first embodiment of the present invention are the same as the above-described operations and effects common to all the embodiments of the present invention.

[Example 2 --- FIGS. 10 and 11]
In the second embodiment of the present invention, the core block 11 has the lower wall 20 but does not have the upper wall. The front and rear end walls 16 and the grid plate 15 extend radially, and the mold is pulled upward during manufacture.
The top plate 50 is made of aluminum and has a rotation stopper 51 at one end.
The protrusions 18 are formed on the left and right ends of the core block 11, and the hooks 52 are formed on the left and right ends of the top plate 50. The top plate 50 is slid in the front-rear direction and assembled to the core block 11. As a result, the relative movement in the left-right direction with respect to the core block 11 of the top plate 50 is restricted.
The lattice plate 15 below the central groove 17 is pulled downward, and the lattice plates 15 below the central groove 17 are parallel to each other or open downward.
The operations and effects of the second embodiment of the present invention are the same as the above-described operations and effects common to all the embodiments of the present invention.

[Example 3 --- FIGS. 12 and 13]
In the third embodiment of the present invention, the core block 11 has the upper wall 19 but does not have the lower wall. The wall center lines of the front and rear end walls 16 and the lattice plate 15 extend in parallel, and the mold is pulled downward during manufacture. The front and rear end walls 16 and the lattice plate 15 are configured such that the upper part is thicker than the lower part due to the draft angle of the mold so that the mold can be removed downward.
The top plate 50 is made of aluminum and has a rotation stopper 51 at one end.
The protrusions 18 are formed on the left and right ends of the core block 11, and the hooks 52 are formed on the left and right ends of the top plate 50. The top plate 50 is slid in the front-rear direction and assembled to the core block 11. As a result, the relative movement in the left-right direction with respect to the core block 11 of the top plate 50 is restricted.
The lattice plate 15 below the central groove 17 is pulled downward, and the lattice plates 15 below the central groove 17 are parallel to each other or open downward.
The operations and effects of the third embodiment of the present invention are the same as the above-described operations and effects common to all the embodiments of the present invention.

[Example 4 --- FIGS. 14 and 15]
In the fourth embodiment of the present invention, the core block 11 has neither an upper wall nor a lower wall. The front and rear end walls 16 and the grid plate 15 extend radially, and at the time of manufacture, the mold is pulled out to the outer peripheral side.
The top plate 50 is made of aluminum and has a rotation stopper 51 at one end.
The protrusions 18 are formed on the left and right ends of the core block 11, and the hooks 52 are formed on the left and right ends of the top plate 50. The top plate 50 is slid in the front-rear direction and assembled to the core block 11. As a result, the relative movement in the left-right direction with respect to the core block 11 of the top plate 50 is restricted.
The lattice plate 15A below the central groove 17 is parallel to the central groove or opens downward so that the mold can be pulled downward.
The operations and effects of the fourth embodiment of the present invention are the same as the above-described operations and effects common to all the embodiments of the present invention.

[Example 5 --- FIG. 16]
In the fifth embodiment of the present invention, the core block 11 has the lower wall 20 but does not have the upper wall. The front and rear end walls 16 and the grid plate 15 extend radially, and the mold is pulled upward during manufacture.
The top plate 50 is made of aluminum.
The protrusion 18 is formed on the core block 11 so as to protrude to the inside of the central groove 17, and the hook 52 is formed at the center in the left-right direction of the top plate 50. The top plate 50 is slid in the front-rear direction and assembled to the core block 11.
The operations and effects of the fifth embodiment of the present invention are the same as the above-described operations and effects common to all the embodiments of the present invention.

[Example 6 --- FIGS. 17 to 21]
In the sixth embodiment of the present invention, the core block 11 has the lower wall 20 but does not have the upper wall.
Projections 18 are formed on the front and rear ends of the core block 11 (front and rear ends of the core block 11 in the wheel circumferential direction), and hooks 52 are formed on the front and rear ends of the top plate 50. The hook 52 is holding the protrusion 18. Since the top plate 50 is constrained by the projection 18 and the hook 52 at the front and rear ends of the core block 11, in the sixth embodiment, there is no need to provide a rotation stopper in the front-rear direction.
The top plate 50 is slid in the left-right direction (direction orthogonal to the arc direction, wheel width direction) and assembled to the core block 11. After the assembly, the top plate 50 is prevented from coming off in the left-right direction by a retaining stopper 53 fixed to the top plate 50. The retaining stopper 53 is made of, for example, a rivet, a screw, a bolt / nut, or the like. The rivet is not fixed to the two plates, but is fixed to one top plate 50. By sandwiching the upper end portion of the core block 11 in the left-right direction between the bent portion 54 formed at one end in the left-right direction of the top plate 50 and the stopper stopper 53 formed at the other end in the left-right direction of the top plate 50, The plate 50 is secured to and fixed to the core block 11 in the left-right direction.
The operations and effects of the sixth embodiment of the present invention are the same as the above-described operations and effects common to all the embodiments of the present invention.

Example 7 --- FIGS. 22 and 23
In the seventh embodiment of the present invention, the core block 11 has the lower wall 20 but does not have the upper wall.
17 to 19 can also be applied to the seventh embodiment of the present invention. The protrusions 18 are formed at the front and rear ends of the core block 11 (front and rear ends in the wheel circumferential direction of the core block 11), and the hooks 52 are formed at the front and rear ends of the top plate 50. The hook 52 is holding the protrusion 18. Since the top plate 50 is constrained by the projection 18 and the hook 52 at the front and rear ends of the core block 11, in the seventh embodiment, there is no need to provide a rotation stopper in the front-rear direction.
As shown in FIGS. 22 and 23, the top plate 50 is slid in the left-right direction (direction perpendicular to the arc direction, wheel width direction) and assembled to the core block 11. Before assembling the slide, a folding portion 55 is formed by bending the top plate end upward and bending the top plate 50 at one end in the left-right direction of the top plate 50, and the top plate end at the other horizontal end of the top plate 50. A bent portion 54 bent downward is formed. The top plate 50 is inserted into the core block 11 from the folded-back portion 55 side and attached. When pushed by the tire 5 at the time of puncture, the folded portion 55 of the top plate 50 is pushed downward and bent to the position of the upper surface of the top plate 50 or a position below it, and a stopper stopper 53 as shown in FIG. Become. By sandwiching the upper end portion of the core block 11 in the left-right direction between a bent portion 54 formed at one end in the left-right direction of the top plate 50 and a stopper stopper 53 at the other end in the left-right direction of the top plate 50, the top plate 50 is The core block 11 is secured and fixed in the left-right direction.
The operations and effects of the seventh embodiment of the present invention are the same as the above-described operations and effects common to all the embodiments of the present invention.

[Example 8 --- FIGS. 24 and 25]
In the eighth embodiment of the present invention, the core block 11 has a core securing belt 40 (a “belt” includes a wire and the like) provided with a coupling / clamping mechanism 41 at the end from the outer peripheral side. Wound up. The core block 11 is tightened by the belt 40 and pressed against the wheel rim 3.
In order to cope with a large load, the central groove 17 is covered with the top plate 50 to receive the load in a distributed manner, and the top plate 50 is received by the core block 11 with both ends supported. 11, it becomes difficult to wind the belt 40 around the central groove 17. In order to allow the belt 40 to be wound around the central groove 17, the belt 40 can be separated at the connection / clamping mechanism 41. As shown in FIG. 25, the belt 40 separated by the connection / clamping mechanism 41 is passed through the hole formed by the central groove 17 and the top plate 50 in order from the end, as shown in FIG. At the finished stage, both ends of the belt 40 are connected and tightened by the connecting / clamping mechanism 41 site.
The operation and effect of the eighth embodiment of the present invention is that the belt 40 can be mounted after the top plate 50 is attached to the core block 11 to form the core block connector 10.

[Example 9--FIG. 26 to FIG. 30]
The ninth embodiment of the present invention proposes a reverse link type mechanism as an example of the connecting / clamping mechanism 41 of the belt 40.
As shown in FIGS. 26 and 27, reversible links 43 having a structure separated by connecting bolts 42 are attached to both ends of a single linear belt 40. Since both ends of the belt 40 are initially separated, the belt 40 can be assembled to the core of the belt 40 by feeding the belt 40 forwardly into the hole formed by the central groove 17 and the top plate 50 of the core block 11. It becomes.
After passing the belt 40 through a predetermined number of holes in the core block 11, as shown in FIGS. 28 and 29, a connecting bolt 42 is inserted to connect the reversible link 43. The bolt 42 also serves as one hinge of the reversible link 43. After the bolt 42 is inserted, the bolt 42 is fixed by the snap ring 44 so as not to come off.
As shown in FIG. 30, the reverse link 43 rotates and tightens the intermediate link 45. After tightening, the belt tension becomes the tightening torque and does not come off. This method is small and light and has a large adjustment stroke.
The operation / effect of the ninth embodiment of the present invention is that the belt 40 can be separated and fastened by the bolt 42 and can be tightened after fastening.

[Example 10--FIGS. 31 to 33]
The tenth embodiment of the present invention proposes a buckle mechanism as an example of the connecting / clamping mechanism 41 of the belt 40.
FIG. 31 shows a state before connection. In this state, a buckle 46 is attached to one end of the linear belt 40, and a buckle receiving tool 47 is attached to the other end of the linear belt 40. The belt 40 is sequentially passed through the hole of the core 1 in a state where the belt 40 is separated by the buckle 46 portion.
32 and 33 show a state in which both ends of the linear belt 40 are connected at the buckle 46 site. The buckle 46 is reversed through the buckle holder 47 and a lock 48 is applied to prevent the buckle from loosening.
The operation and effect of the ninth embodiment of the present invention is that the buckle type connecting mechanism does not require a bolt to be inserted at the time of connection unlike the reverse link type, so that the connecting operation is easy.

[Example 11 --- FIG. 34]
Since the run-flat system of the present invention uses the horizontally loaded rim 3 and the conventional tire 5, the tire bead is not in close contact with the rim flange 4 at the time of puncture, and “bead detachment” is likely to occur. However, since the core 1 is securely fixed to the rim 3 by the belt 40, a driving force, a braking force, and the like are transmitted between the tire 5 and the wheel 2 by transmission of a force caused by friction between the tire back surface and the core 1. Can convey lateral force.
For this purpose, the frictional force between the rim 3 and the core 1 must be greater than the frictional force between the tire back surface and the core 1. If the number of cores is n,
Rim × core friction force = (W + nU) × μ2 × R2
Rim x tire friction force = W x μ1 x R1
However,
W: Wheel load, U: Core tightening force, R1: Core outer diameter, R2: Rim outer diameter, μ1, μ2: Friction coefficient,
Therefore, (W + nU) × μ2 × R2> W × μ1 × R1 is a necessary condition that the core does not slip. Approximately, if μ1 = μ2, this equation becomes simple,
U> (R1-R2) W / (nR2).
Therefore, the minimum tightening force required for the core 1 is (R1-R2) W / (nR2). The tension of the belt 40 is determined so that the core tightening force (U) is equal to or greater than this force.

It is sectional drawing of the run flat core of this invention (and Example 1 of this invention), and its vicinity. 2 is a cross-sectional view of the run-flat core of FIG. 1 and the vicinity thereof in a direction orthogonal to FIG. It is sectional drawing of the run flat core of this invention (and Example 1 of this invention). It is sectional drawing of the direction orthogonal to FIG. 3 of the run flat core of this invention (and Example 1 of this invention). It is sectional drawing of the top plate of the run-flat core of this invention (and Example 1 of this invention). It is sectional drawing of the direction orthogonal to FIG. 5 of the top plate of the run flat core of this invention (and Example 1 of this invention). It is a top view of the top plate of FIG. It is sectional drawing in the state in the middle of mounting | wearing the top plate with the top plate of the run flat core of this invention (and Example 1 of this invention). It is sectional drawing of the state which stopped rotation of the top plate with respect to the core block of the run flat core of this invention (and Example 1 of this invention). It is sectional drawing of the run flat core of Example 2 of this invention. It is sectional drawing of the direction orthogonal to FIG. 10 of the run flat core of FIG. It is sectional drawing of the run flat core of Example 3 of this invention. FIG. 13 is a cross-sectional view of the run-flat core of FIG. 12 in a direction orthogonal to FIG. It is sectional drawing of the run-flat core of Example 4 of this invention. It is sectional drawing of the direction orthogonal to FIG. 14 of the run flat core of FIG. It is sectional drawing of the run flat core of Example 5 of this invention, and its vicinity. It is a front view of the top plate of the run flat core of Example 6 of this invention. It is a top view of the top plate of FIG. It is sectional drawing of the run-flat core of Example 6 of this invention. FIG. 20 is a cross-sectional view of the run-flat core of FIG. 19 in a direction orthogonal to FIG. It is sectional drawing of the run flat core of Example 6 of this invention, and its vicinity. It is sectional drawing of the run flat core of Example 7 of this invention, and its vicinity before puncture. It is sectional drawing after puncture of the run flat core of Example 7 of this invention, and its vicinity. It is sectional drawing of the run flat core fastened with the belt of Example 8 of this invention, and its vicinity. It is sectional drawing of the state which penetrates a belt in the run-flat core of Example 8 of this invention. It is a side view before the connection of the connection / clamping mechanism part of the belt of the run flat core of Example 9 of this invention. FIG. 27 is a plan view of a belt coupling / clamping mechanism portion of FIG. 26. It is a side view of the run-flat core of the ninth embodiment of the present invention after the connection and before the tightening of the belt coupling / tightening mechanism. FIG. 29 is a plan view of a belt coupling / clamping mechanism portion of FIG. 28. It is a side view of the run-flat core of the ninth embodiment of the present invention after tightening after coupling of the belt coupling / clamping mechanism. It is a side view before the connection of the connection / clamping mechanism part of the belt of the run flat core of Example 10 of this invention. It is a side view after the connection of the connection / clamping mechanism part of the belt of the run flat core of Example 10 of this invention. FIG. 33 is a plan view of a belt coupling / clamping mechanism portion of FIG. 32. It is sectional drawing of the wheel with tire which mounted | wore with the run-flat core of Example 11 of this invention. It is sectional drawing of the 1/4 part of the conventional run flat core and the wheel with a tire which mounted | wore with it. It is sectional drawing of the 1/2 part in the puncture state of the run-flat core of a comparative example, and the wheel with a tire which mounted | wore with it.

Explanation of symbols

1 Runflat core (also simply called core)
2 Wheel 3 Wheel rim (also called rim)
4 Rim flange (also called flange)
5 Tire 6 Wheel center 10 Core block connector 11 Core block 12 Upper surface 13 Lower surface 14 Box 15 Grid plate 15A Vertical leg 16 below central groove 17 Front and rear end walls 17 Central groove 18 Projection 19 Upper wall 20 Lower Wall 40 Belt 41 Connection / tightening mechanism 43 Reversing link 44 Snap ring 45 Intermediate link 46 Buckle 47 Buckle support 48 Lock 50 Top plate 51 Rotating stopper 52 Hook 53 Retaining stopper 54 Bending portion 55 Folding portion

Claims (13)

A plurality of core blocks connected to each other in the circumferential direction of the wheel and fastened to a wheel rim by a belt, each core block of the plurality of core blocks being made of plastic, and one of an upper surface and a lower surface A core block coupling body having a shape having a box with at least one surface opened and a lattice plate provided for reinforcement in the box;
A top plate attached to the upper surface of each core block as a separate piece from the core block;
Run-flat core with. The run-flat core according to claim 1, wherein the top plate is made of metal. The run-flat core according to claim 1, wherein the top plate is a heat-resistant resin. The run-flat core according to claim 1, wherein a lattice plate of the core block and front and rear end walls of the box extend radially with respect to a center of the wheel. The run-flat core according to claim 1, wherein the core block has a central groove extending in a circumferential direction of the wheel and opening upward, and the top plate covers the central groove of the core block. The top plate has a rotation stopper formed by bending one end of the top plate downward, and the rotation stopper is inserted into a gap between two adjacent core blocks to prevent rotation with respect to the core block of the top plate. The run-flat core according to claim 1. The core block is formed with a projection, and the top plate is formed with a hook that is slidable with respect to the projection and holds the projection, and the top plate is slid to form the core block. The run-flat core according to claim 1, wherein the run-flat core is assembled to the core. The protrusion is formed on the left and right ends of the core block, the hook is formed on the left and right ends of the top plate, and the top plate is slid in the front-rear direction and assembled to the core block. 7. The run-flat core according to 7. The protrusion is formed on the core block so as to protrude to the inside of the central groove, the hook is formed at a center portion of the top plate, and the top plate is slid in the front-rear direction to be The run-flat core according to claim 7, wherein the run-flat core is assembled to the child block. The protrusions are formed at the front and rear ends of the core block, the hooks are formed at the front and rear ends of the top plate, and the top plate is slid in the left-right direction and assembled to the core block. The run-flat core according to claim 7, wherein the run-flat core is secured by a retaining stopper provided on the plate. The run-flat core according to claim 1, wherein a core lashing belt having a connecting / clamping mechanism provided at an end thereof is wound around the core block from the outer peripheral side and pressed against a wheel rim. The tightening force of the core block to the wheel rim is (R1-R2) W / (when R1 is the core outer diameter, R2 is the rim outer diameter, W is the wheel load, and n is the number of core blocks. The run-flat core according to claim 1, which is nR2) or more. The run-flat core according to claim 1, which is also mounted on a vehicle having an axle load of 7KN or more.

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