HK1179575B - Core for pneumatic tire, tire with core, and vehicle equipped with tires with core - Google Patents

Description

Core for pneumatic tire, tire with core, and vehicle equipped with tire with core

Technical Field

The present invention relates to a core (core) for a pneumatic tire, which is divided into a plurality of segments at a constant interval in a circumferential direction, such as a vehicle used in a new transportation system, the tire with the core, and a vehicle provided with the tire.

Background

In recent new traffic systems such as monorail and subway, vehicles using a core type auxiliary wheel tire for supporting a tire from the inside when the inner pressure of a tubeless pneumatic tire is lowered are known. As an example of such a core of a pneumatic tire, a joint of the core divided equally in the circumferential direction by 3 is set to a normal direction (an axle of the tire is set to a radial direction of a central axis), and each of the mating surfaces is fastened by a plurality of bolts and nuts (for example, see patent document 1).

Fig. 15 shows an example of the core disclosed in patent document 1. In the core 10 shown in fig. 15, flange portions 10e having bolt holes are provided on the divided surfaces of the divided blocks (split pieces) 10P which are equally divided in three in the circumferential direction, and the flange portions 10e of the adjacent divided blocks 10P are joined to each other by bolts and nuts 10f to form an annular core 10.

However, in the core 10 of fig. 15, in a normal state where the tire 1 is not deflated, the core 10 is not subjected to a load in a state where the core 10 is placed inside the tire, and a gap is formed between the tire tread portion and the core 10. The tire 1 is deflated and the internal pressure is reduced due to the leakage of the voids. In this case, the core 10 is in contact with the inner surface of the tire tread portion and receives the load applied to the tire 1. As a result, the core 10 rotates together with the wheel, and the amount of drop (amount of sinking) due to the blow-by gas is restricted, so that the vehicle can travel while suppressing the inclination thereof.

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent publication Hei 10-211807

Disclosure of Invention

Problems to be solved by the invention

However, the vehicle wheel having the conventional core has the following problems.

In patent document 1, when trisected cores are integrally joined, the cores are assembled in the tire with the bead portion of the tire open, and bolts and nuts are put in to perform fastening work of the trisected cores. However, since the tire itself is made of a hard rubber material, it is difficult to widen the bead portion greatly, and there is a problem that workability inside the tire is poor. Therefore, it is desired to improve workability in assembling and disassembling the core.

In addition, the core needs to be disassembled when the tire is replaced. In this case, since the core split surfaces are located in the normal direction, when the joint portion of the core passes through the ground surface side during run-flat traveling, a biasing force acts on both split surfaces, and a shearing force acts on the coupling bolt in which the bolt shaft is arranged in a direction straight to the split surfaces. In this case, since the rubber sheet of the elastic body is interposed between the wheels, the coupling bolt is less likely to be deformed slightly and fall off at the joint portion. Therefore, by hard removing the coupling bolt, the bolt hole of the core is widened to form a hole, and a treatment such as an additional sleeve is required.

The present invention has been made in view of the above problems, and an object thereof is to provide a core for a pneumatic tire, a core tire, and a vehicle including the core tire, in which workability of assembling and disassembling divided cores is improved and work efficiency is improved by suppressing deformation of a joint bolt in a shearing direction in a joint portion between the divided cores.

Means for solving the problems

To achieve the above object, a first aspect of the present invention is a core for a pneumatic tire, which is divided into a plurality of segments at regular intervals in a circumferential direction, and each of the segments adjacent to each other in the circumferential direction is coupled to each other at an inner circumferential side in a radial direction thereof by a coupling shaft member disposed in an axial direction thereof in a width direction of the segment.

In the above-described embodiment 1, when a load acts on the core in the tire during run-flat running, the core split surface is in the normal direction. Therefore, when the joint portion between the divided pieces of the core adjacent in the circumferential direction passes through the ground surface side, a biasing force (shearing force) acts between the divided pieces. In this case, since the connecting shaft member for connecting the divided pieces is disposed on the radially inner periphery side so that the axial direction of the connecting shaft member is oriented in the width direction of the divided pieces, the axial direction of the connecting shaft member is parallel to the shearing direction. Therefore, compared to the conventional structure in which the axial direction of the connecting bolt is perpendicular to the shearing direction, deformation of the connecting shaft member due to a load in the shearing direction can be suppressed. Therefore, the disassembling operation of the core caused by the deformation of the connecting shaft member is not hindered, and the operation efficiency can be improved.

Further, since the connecting shaft member is disposed on the radially inner peripheral side, the connecting shaft member provided on the split surface of the split blocks can be attached to and detached from the vicinity of the opening of the bead portion of the tire, and therefore, the workability of assembling and disassembling the split core can be improved. Therefore, the working time can be shortened, and the cost required for tire replacement can be reduced.

Preferably, the split surfaces formed by the split blocks each have a cross surface having a predetermined angle with respect to the radial direction on the outer circumferential side in the radial direction with respect to the connecting shaft member.

Since the intersecting surface is located radially outward of the connecting shaft member and serves as a load receiving surface for receiving a load in the shearing direction acting between the divided pieces, the load in the shearing direction does not directly act on the connecting shaft member. Therefore, the deformation of the connecting shaft member can be suppressed more reliably. In this way, since the occurrence of deformation of the connecting shaft member is suppressed, the disassembling operation of the core associated with the deformation of the connecting shaft member can be efficiently performed.

Preferably, the connecting shaft member is a pin member inserted coaxially through the adjacent divided blocks.

In this case, the pin member is simply inserted through the adjacent divided blocks only on the inner peripheral side in the radial direction and assembled. Therefore, since fastening work such as bolts and nuts is not required, work efficiency in assembling and disassembling the divided cores can be improved. Further, since a bolt and a nut are not used, torque management using a torque wrench is not required. Therefore, not only the disadvantage that the nut is forgotten to be fastened can be eliminated, but also the disadvantage that the bolt and the nut are loosened to be unable to support the load by the core and the vehicle is inclined can be prevented.

Preferably, the split surfaces of the split blocks are formed with recessed grooves extending in the width direction on the outer peripheral side in the radial direction of the connecting shaft member, and the load receiving pins are inserted into communication portions formed by both of the recessed grooves facing each other on the engaging surfaces in a state where the adjacent split blocks are engaged with each other by the split surfaces.

When a tire is deflated and a load is supported by the core to travel, even if a load in the shearing direction acts on the split surfaces of the split blocks, the load can be applied to the load receiving pin positioned on the outer circumferential side in the radial direction. Therefore, the load in the shearing direction does not directly act on the connecting shaft member provided radially inward of the load receiving pin, and the deformation of the connecting shaft member can be suppressed more reliably. In this way, since the deformation of the connecting shaft member is suppressed, the disassembling operation of the core associated with the deformation of the connecting shaft member can be efficiently performed.

In addition, convex insertion portions having insertion holes through which the connecting shaft members are inserted may be provided on the divided surfaces formed by the divided blocks, and the adjacent divided blocks may be alternately engaged with each other so that the convex insertion portions are coaxially arranged with the insertion holes.

In this case, when the tire is deflated and the vehicle travels while supporting the load by the core, the convex insertion portions of one of the divided blocks and the convex insertion portions of the other divided block are alternately supported, so that the load in the normal direction acting on the connecting shaft member can be dispersed.

Preferably, the 1 st blocking member for restricting the axial movement of the connecting shaft member is provided at both end portions of the connecting shaft member.

Thus, since the movement of the connecting shaft member in the axial direction is restricted, the connecting shaft member does not come off or loosen at the joint portion between the divided pieces of the core, and the joint state between the divided pieces is secured.

Preferably, the 2 nd preventing member for restricting the axial movement of the load receiving pin is provided at both ends of the load receiving pin.

In this case, since the movement of the load receiving pin in the axial direction is restricted, there is an advantage that the load receiving pin is not detached or loosened at the joint portion between the divided pieces of the core.

Preferably, on the split surfaces formed by the split blocks, an engaging convex portion protruding from one of the split blocks and an engaging concave portion fitted with the engaging convex portion in the other split block are provided on the outer circumferential side in the radial direction of the connecting shaft member.

In the divided blocks, a load receiving surface that holds a predetermined angle in the radial direction is formed by the engagement of the engaging convex portion and the engaging concave portion, and the load receiving surface bears a load in the shearing direction that acts between the divided blocks. Therefore, the load in the shearing direction does not directly act on the connecting shaft member, and the deformation of the connecting shaft member can be more reliably suppressed. In this way, since the deformation of the connecting shaft member is suppressed, the disassembling operation of the core associated with the deformation of the connecting shaft member can be efficiently performed.

The present invention according to claim 2 relates to a pneumatic tire provided with the above core therein.

The invention according to claim 3 relates to a vehicle including a plurality of running wheels each including the above-described cored tire.

In the present invention according to the 2 nd and 3 rd aspects, since the core for a pneumatic tire according to the 1 st aspect of the present invention is provided, it is possible to provide a cored tire or a vehicle capable of suppressing deformation of the connecting shaft member due to a load in the shearing direction.

Effects of the invention

According to the core for a pneumatic tire, the tire with a core, and the vehicle including the tire with a core of the present invention, by suppressing deformation of the connecting shaft member with respect to a load in the shearing direction at the joint portion between the divided cores, workability of assembly and disassembly of the divided cores can be improved, and work efficiency can be improved.

Drawings

Fig. 1 is a partial sectional view showing an outline of a wheel according to embodiment 1 of the present invention.

Fig. 2 is a side view showing a core according to embodiment 1 of the present invention.

Fig. 3 is a sectional view taken along line a-a of fig. 2.

Fig. 4 is a cross-sectional view taken along line B-B of fig. 2.

Fig. 5 is a side view for explaining a state before joining adjacent divided blocks in embodiment 1 of the present invention, that is, a 1 st divided surface and a 2 nd divided surface.

Fig. 6 is a side view for explaining the operation of the core shown in fig. 1.

Fig. 7 is a side view showing a core according to embodiment 2 of the present invention.

Fig. 8 is a cross-sectional view taken along line C-C of fig. 7.

Fig. 9 is a side view for explaining a state before joining adjacent divided blocks in embodiment 2 of the present invention, that is, a 1 st divided surface and a 2 nd divided surface.

Fig. 10 is a side view for explaining the operation of the core shown in fig. 7.

Fig. 11 is a side view showing a core according to embodiment 3 of the present invention.

Fig. 12 is a cross-sectional view taken along line D-D of fig. 11.

Fig. 13 is a side view for explaining a state before joining adjacent divided blocks in embodiment 3 of the present invention, that is, a 1 st divided surface and a 2 nd divided surface.

Fig. 14 is a side view for explaining the operation of the core shown in fig. 11.

Fig. 15 is a side view showing a conventional core.

Description of the reference symbols

1 tire (pneumatic tire)

2 wheel

3 axle hub

10A, 10B core

10a 1 st division plane

10b 2 nd division plane

10c 1 st load bearing surface (intersecting surface)

10d 2 nd load receiving surface (intersecting surface)

10P partition block

11 Joint pin (connecting shaft component)

16A, 16B joint plate

17 the 1 st convex insertion part

17a insertion hole

18 nd 2 nd convex insertion part

18a insertion hole

19C shaped retainer ring (No. 1 pulling-out preventing component)

20 semicircular groove (groove)

21 load bearing pin

22 pressing end plate (No. 2 pulling prevention component)

23 engaging projection

24 engaging recess

Detailed Description

Next, a core for a pneumatic tire, a cored tire, and a vehicle according to embodiments of the present invention will be described based on the drawings.

(embodiment 1)

As shown in fig. 1, a core 10A according to embodiment 1 of the present invention is incorporated into a pneumatic tire (hereinafter simply referred to as a tire 1), and supports the tire 1 from the inside when the internal pressure of the tire 1 decreases.

Here, reference numeral 2 of fig. 1 denotes a wheel, reference numeral 3 denotes an axle hub, reference numeral 4 denotes a rim retainer, reference numeral 5 denotes a pin ring, reference numeral 6 denotes a valve, and reference numeral 7 denotes a rubber sheet (gumseet) provided between a core 10A and a rim flange 2A of the wheel 2.

In fig. 1 to 3, the left side of the drawing is the inside in the vehicle width direction, and the right side of the drawing is the outside in the vehicle width direction.

In the core 10A, a direction perpendicular to the axle P of the axle hub 3 is referred to as a radial direction or a radial direction, a direction around the periphery of the axle P is referred to as a circumferential direction, and a direction parallel to the axle P is referred to as a width direction X.

The core 10A includes a crown portion 12 that supports the tire 1 from inside, a base portion 13 that forms the radially innermost side of the core 10, a support portion 14 that connects the base portion 13 and the crown portion 12, and reinforcing ribs 15 that reinforce the support portion 14 provided at intervals in the circumferential direction. The core 10A has a substantially H-shaped cross section.

As shown in fig. 2 to 4, the core 10A is divided into a plurality of (three equal parts in this case) parts at regular intervals in the circumferential direction. The divided core 10A is set as a divided block 10P. The circumferentially adjacent divided blocks 10P, 10P are coupled to each other at the radially inner periphery thereof by a coupling pin 11 (coupling shaft member) whose axial direction is directed in the width direction X of the divided block 10P. That is, the segment block 10P has the 1 st segment surface 10a at one circumferential end and the 2 nd segment surface 10b at the other circumferential end.

Then, the ring-shaped core 10A is formed by joining the 1 st divided surface 10A of one divided block 10P and the 2 nd divided surface 10b of the other divided block 10P which are adjacently arranged in the circumferential direction.

As shown in fig. 5, the 1 st divided surface 10a is provided with a joining flange 16A, and a plurality of (two in this case) 1 st projecting insertion portions 17 having insertion holes 17a for inserting the joining pins 11 to the inner side in the radial direction are provided in the width direction. Further, on the radially outer side of the divided block 10P, a 1 st load receiving surface 10c (intersecting surface) facing the circumferential outer side of the divided block 10P is formed.

The 2 nd divided surface 10B is provided with a joining flange 16B, and a plurality of (three in this case) 2 nd projecting insertion portions 18 having insertion holes 18a for inserting the joining pins 11 to the inner side in the radial direction are provided in the width direction. Further, on the radially outer side of the divided block 10P, a 2 nd load receiving surface 10d (intersecting surface) facing the circumferentially inner side of the divided block 10P is formed. The 1 st load receiving surface 10c and the 2 nd load receiving surface 10d are inclined surfaces that are inclined at a predetermined angle with respect to the radial direction, and the surfaces 10c and 10d are in surface contact with each other.

The 2 nd projecting insertion portions 18 are engaged with the 1 st projecting insertion portions 17 alternately in the width direction. That is, in a state where the 1 st projecting insertion portion 17 and the 2 nd projecting insertion portion 18 are engaged with each other, the insertion holes 17a and 18a are coaxial with each other, and the coupling pin 11 is inserted therethrough.

As shown in fig. 4, C-shaped retainers 19 (1 st preventing member) for restricting the movement of the coupling pin 11 in the axial direction are provided at both ends of the coupling pin 11 inserted into the insertion holes 17a and 18 a.

Next, the operation of the core 10A configured as described above will be described based on the drawings.

As shown in fig. 6, when a load acts on the core 10A in the tire 1 during run-flat running, the 1 st split surface 10A and the 2 nd split surface 10b of the core 10A are positioned in the normal direction Y. Therefore, when the joint portion T between the divided pieces 10P, 10P of the core 10A adjacent in the circumferential direction passes through the ground surface side, a biasing force (shearing force) acts between the divided pieces 10P, 10P. At this time, on the radially inner side, the axial direction of the coupling pin 11 that couples the divided blocks 10P, 10P is arranged toward the width direction of the divided block 10P, and therefore, the axial direction of the coupling pin 11 is parallel to the shearing direction.

Therefore, compared to the conventional structure in which the axial direction of the connecting bolt or the like is orthogonal to the shearing direction, the load in the shearing direction does not directly act on the connecting pin 11, and therefore, the deformation of the connecting pin 11 can be suppressed. Therefore, the work efficiency can be improved without hindering the disassembling work of the core 10A caused by the deformation of the coupling pin 11.

Further, since the coupling pins 11 are arranged on the radially inner peripheral side, the mounting and dismounting operations of the coupling pins 11 provided on the 1 st divided surface 10A and the 2 nd divided surface 10b of the divided blocks 10P and 10P are performed in the vicinity of the opening of the bead portion of the widened tire 1, and therefore, the assembling and disassembling workability of the divided core 10A can be improved. Therefore, the working time can be shortened, and the cost for replacing the tire can be reduced.

The 1 st load receiving surface 10c is a load receiving surface on the outer circumferential side in the radial direction of the coupling pin 11, and receives a load in the shearing direction acting between the divided blocks 10P and 10P. Therefore, the above-described load in the shearing direction does not directly act on the coupling pin 11, and the deformation of the coupling pin 11 can be suppressed more reliably. Thus, since the deformation of the coupling pin 11 is suppressed, the disassembling operation of the core 10A associated with the deformation of the coupling pin 11 can be efficiently performed.

Further, the core 10A is simply assembled by inserting the pin member through each of the adjacent divided blocks 10P only on the inner peripheral side in the radial direction. Therefore, fastening work such as bolts and nuts is not required, and therefore, the work efficiency in assembling and disassembling the segment block 10P can be improved. In addition, since the bolt and the nut are not used, torque management using a torque wrench is not required, and the disadvantage that the nut is forgotten to be fastened can be eliminated. Further, the nut and the bolt are loosened at the time of tire leakage, and the vehicle can be prevented from being inclined due to the failure of the core to support the load.

Further, when the tire 1 is deflated and the vehicle travels with the load supported by the core 10A, the 1 st projecting insertion portion 17 of one divided block 10P and the 2 nd projecting insertion portion 18 of the other divided block 10P are alternately supported, so that the load in the normal direction Y acting on the coupling pin 11 can be dispersed.

Further, since the movement of the coupling pin 11 in the axial direction is restricted by the C-shaped retainer 19, the coupling pin 11 does not come off or loosen from the divided pieces 10P of the core 10A, and the engagement state between the divided pieces 10P is secured.

In the vehicle including the core for a pneumatic tire, the core tire, and the core tire of embodiment 1 described above, workability of assembling and disassembling the divided cores is improved, and work efficiency is improved. Further, deformation of the joint portion of the joint pin 11 with respect to the divided cores (divided blocks 10P) due to shearing force can be suppressed.

Next, although other embodiments of the core for a pneumatic tire, the cored tire, and the vehicle according to the present invention will be described with reference to the drawings, the same or similar members and portions as those of embodiment 1 will be given the same reference numerals and description thereof will be omitted, and the configuration different from embodiment 1 will be described.

(embodiment 2)

As shown in fig. 7 to 9, in the core 10B according to embodiment 2, a semicircular groove 20 (concave groove) extending in the width direction X is formed in the radial direction at the 1 st divided surface 10a and the 2 nd divided surface 10B of the divided block 10P. In a state where the circumferentially adjacent divided blocks 10P, 10P are engaged with each other by the 1 st divided surface 10a, the 2 nd divided surface 10b, the load receiving pin 21 is inserted into the communicating portion formed by both the semicircular grooves 20, 20.

Then, the movement of the load receiving pin 21 inserted into the communication portion in the axial direction is restricted by the pressing end plate 22 (2 nd preventing member) whose both end portions are fixed to one of the divided blocks 10P of the joint portion T by bolts.

As shown in fig. 10, in embodiment 2 of the present invention, even when a load in the shearing direction acts on the 1 st divided surface 10a and the 2 nd divided surface 10B of each of the divided blocks 10P and 10P when the tire 1 is deflated and the vehicle travels with the load supported by the core 10B, the load can be applied to the load receiving pin 21 positioned on the outer peripheral side in the radial direction. Therefore, the load in the shearing direction does not directly act on the coupling pin 11 provided radially inward of the load receiving pin 21, and deformation of the coupling pin 11 can be suppressed more reliably. Thus, deformation of the coupling pin 11 is suppressed, and therefore, the disassembling operation of the core 10B associated with the deformation of the coupling pin 11 can be efficiently performed.

(embodiment 3)

Next, fig. 11 to 13 show a core 10C according to embodiment 3. In the joint portion T of the divided block 10P, the core 10C is provided with a step-shaped engaging convex portion 23 protruding from the 1 st divided surface 10a of one divided block 10P and an engaging concave portion 24 engaging with the engaging convex portion 23 in the 2 nd divided surface 10b of the other divided block 10P on the outer circumferential side in the radial direction with respect to the coupling pin 11.

In embodiment 3 of the present invention, the engagement between the engaging convex portion 23 and the engaging concave portion 24 forms the load receiving surfaces 10c and 10d that are held at a predetermined angle with respect to the radial direction. The load receiving surfaces 10c and 10d bear a load in the shearing direction acting between the divided blocks 10P. Therefore, the above-described load in the shearing direction does not directly act on the coupling pin 11, and the deformation of the coupling pin 11 can be suppressed more reliably (see fig. 14). Thus, since the deformation of the coupling pin 11 is suppressed, the core disassembling operation associated with the deformation of the coupling pin 11 can be efficiently performed.

The embodiments of the core for a pneumatic tire, the tire with a core, and the vehicle including the tire with a core of the present invention have been described above, but the present invention is not limited to the above embodiments and can be appropriately modified within the scope not departing from the gist thereof.

For example, in the present embodiment, the C-shaped retainer 19 is used as the extraction prevention member of the coupling pin 11, but the extraction is not limited to this, and the extraction may be prevented by an appropriate member such as an E-shaped retainer, a pine pin, or a split pin.

In embodiment 2, the load receiving pins 21 having a circular cross section are inserted by combining the semicircular grooves 20 and 20 of the 1 st and 2 nd divided surfaces 10a and 10b, but the present invention is not limited thereto. For example, the groove may be a square groove or a triangular groove. In this case, the cross-sectional shape of the load receiving pin may be such that the rectangular pin is inserted horizontally into the rectangular groove and the rectangular pin is inserted obliquely at an angle of 45 degrees with respect to the triangular groove.

In embodiment 3, the load receiving surfaces 10c and 10d having a predetermined angle with respect to the radial direction are formed by the engagement of the engaging convex portion 23 and the engaging concave portion 24, but the present invention is not limited thereto. For example, the engaging convex portion 23 may have a semi-cylindrical shape, and in this case, the engaging concave portion 24 may be a groove having a semi-cylindrical surface.

In addition, the components of the above embodiments may be replaced with well-known components as appropriate without departing from the scope of the present invention, and the above embodiments may be combined as appropriate.

The present invention is based on the priority claim of Japanese application No. 2010-284852, which is filed on Japanese application on 21/12/2010, the contents of which are incorporated herein by reference.

Industrial applicability of the invention

According to the core for a pneumatic tire, the tire with a core, and the vehicle including the tire with a core of the present invention, deformation of the connecting shaft member with respect to a load in the shearing direction is suppressed in the joint portion between the divided cores, whereby workability of assembly and disassembly of the divided cores can be improved, and work efficiency can be improved.

Claims (8)

1. A core for a pneumatic tire, which is a core for a pneumatic tire dividable into a plurality in a circumferential direction, comprising:

a plurality of divided blocks which are adjacent to each other in the circumferential direction and are mutually connected to constitute the core; and

a connecting shaft member disposed in a width direction of the divided blocks and connecting the adjacent divided blocks to each other,

a 1 st divided block included in the plurality of divided blocks includes a 1 st divided surface forming a divided surface with a 2 nd divided block adjacent to the 1 st divided block,

the 1 st division surface has a 1 st inclined surface parallel to the width direction of the division block and inclined with respect to the radial direction of the core,

the 2 nd divided block includes a 2 nd divided surface forming the divided surface with the 1 st divided block,

the 2 nd division surface has a 2 nd inclined surface parallel to the width direction of the division block and inclined with respect to the radial direction of the core,

when the 1 st and 2 nd divided blocks are assembled, the 1 st inclined surface and the 2 nd inclined surface are in surface contact with each other, and the 1 st and 2 nd inclined surfaces in surface contact with each other are located on the outer peripheral side in the radial direction of the core than the connecting shaft member,

a convex insertion portion having an insertion hole through which the connecting shaft member is inserted is provided on a divided surface formed by the divided blocks,

the adjacent divided blocks are alternately engaged with each other so that the convex insertion portions are coaxially arranged with the insertion holes,

the convex insertion portion is formed to be continuous with a radial inner peripheral surface of the core.

2. A core for a pneumatic tire as set forth in claim 1,

the connecting shaft member is a pin member inserted coaxially through the adjacent divided blocks.

3. A core for a pneumatic tire as set forth in claim 1,

a groove extending in the width direction is formed on the split surface of the split block on the outer peripheral side in the radial direction with respect to the connecting shaft member,

the load receiving pin is inserted into a communication portion formed by the grooves of the two opposing split surfaces in a state where the adjacent split blocks are engaged with each other by the split surfaces.

4. A core for a pneumatic tire as set forth in claim 1,

first extraction preventing members are provided at both ends of the connecting shaft member, and the first extraction preventing members restrict the movement of the connecting shaft member in the axial direction.

5. A core for a pneumatic tire as set forth in claim 3,

2 nd preventing members are provided at both ends of the load receiving pin, and the 2 nd preventing members restrict the movement of the load receiving pin in the axial direction.

6. A core for a pneumatic tire as set forth in claim 1,

on a divided surface formed by the divided blocks, an engaging convex portion protruding from one divided block and an engaging concave portion fitted with the engaging convex portion in the other divided block are provided on the outer peripheral side in the radial direction of the connecting shaft member.

7. A cored tire comprising the core for a pneumatic tire of any one of claims 1 to 6 in its inside.

8. A vehicle comprising a plurality of running wheels provided with the cored tire of claim 7.