JP5745820B2 - Run-flat core assembly - Google Patents

Description

  The present invention relates to a run-flat core assembly that is mounted on a vehicle wheel and enables the vehicle to travel even when a tire is punctured.

  The run-flat core assembly is mounted in an annular shape on the outer periphery of the rim of the vehicle wheel. Although the tread portion of the tire and the core assembly are separated during normal vehicle travel, the core assembly supports the tread portion of the tire when the tire is punctured to enable vehicle travel.

  As described in Patent Documents 1 and 2, a normal core assembly is configured by connecting a plurality of metal cores having an arc shape. These cores have sufficient rigidity to hit the tread portion of the tire to support the vehicle weight and to withstand vibrations and impacts from the road surface.

  By the way, when the tire is traveling in a punctured state as described above, an excessive impact load may be applied to the tire. For example, when running while riding on a road fence where tires are evenly spaced and traveling at a vehicle speed that causes the vehicle spring to resonate, an excessive and local impact load is applied from the road fence to the tire. Is done. In particular, the impact load increases as the vehicle weight increases, and becomes even greater when a load weight is added as in a truck.

In addition, if the tire tread is sandwiched between a metal-made rigid core assembly and a roadside, it will not be able to run due to cracks, etc. It can also be damaged to some extent.
Note that the damage to the tread portion of the tire due to the impact load described above is that even if the tire is not punctured, the air in the tire is greatly reduced, leaving a slight gap between the tire tread portion and the core. It may also occur when driving in the state of being left behind.

  In order to solve such problems, the core assembly described in Patent Document 3 is configured such that each core is provided with a rubber buffer layer on the outer periphery of a metal piece body. This buffer layer is intended to absorb the impact load applied to the tread portion of the tire.

JP-A-63-231305 JP 2006-347369 A JP 2002-59720 A

  However, in the core assembly of Patent Document 3, the impact energy is sufficiently absorbed by the local elastic deformation of the rubber buffer layer when receiving an excessive and local impact load from the road fence as described above. Can not.

  The present invention has been made in order to solve the above-described problem, and is for a run flat that is mounted on a wheel rim in an annular shape by connecting a plurality of arc-shaped cores arranged in the circumferential direction and connected to each other. In the core assembly, each of the cores has a highly rigid core body facing the tread portion of the tire, and is disposed on the inner peripheral side of the core body and has a lower rigidity than the core body. The deformation planned portion is provided, and when the excessive impact load is applied, the deformation planned portion is plastically deformed.

  According to the above configuration, when an excessive and local impact load is applied to the tire while the vehicle is running in a tire punctured state or a state where the tire air pressure is greatly reduced, the impact load is deformed via the core body. This is transmitted to the planned portion, and the planned deformation portion is plastically deformed to absorb the impact energy. As a result, damage such as cracks in the tire tread portion can be reliably avoided, and vehicle travel can be continued.

Preferably, the dimension in the wheel radial direction of the planned deformation portion is smaller than the core body.
According to this, it is not necessary to greatly reduce the circumscribed circle diameter of the core assembly, and the vehicle travel can be stably continued.

Preferably, the deformed portion is hollow and has a pair of side walls facing in the wheel axial direction.
According to this, impact energy can be absorbed by plastic deformation of the pair of side walls of the deformation planned portion.

Preferably, the deformable portion and the core body are separate, the deformable portion is detachable with respect to the core body, and is relatively immovable in the wheel circumferential direction and the wheel axis direction.
According to this, when a deformation | transformation scheduled part deforms plastically, only a deformation | transformation scheduled part can be replaced | exchanged.

Preferably, the connecting portion is provided so as to protrude from both ends of the core body in the circumferential direction of the wheel, and the connecting means for connecting the connecting portions of the adjacent cores is formed between the connecting portions when receiving an excessive impact load. Relative displacement is allowed, and thus relative displacement between cores is allowed.
According to this, the plastic deformation of the said deformation | transformation scheduled part can be reliably performed by the relative displacement of cores.

Preferably, the connecting means includes a through hole formed in the connecting portion along the wheel axial direction, at least one washer, a bolt that passes through the washer and passes through the through hole of the connecting portion, A nut screwed onto the bolt,
The through hole of at least one connecting portion is larger than the diameter of the bolt, and the washer is engaged with the inner periphery of the through hole of the one connecting portion to inhibit relative displacement between the washer and the one connecting portion. A locking portion is provided, and when the locking portion is deformed or destroyed by an impact load, relative displacement between the connecting portions of adjacent cores is allowed.

  According to the present invention, even when an excessive and local impact load is applied to the tire during traveling of the vehicle in a tire punctured state or a state in which the tire air pressure is greatly reduced, the destruction of the tire can be reliably avoided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view of a vehicle wheel equipped with a run-flat core assembly according to a first embodiment of the present invention. It is a front view of the core which is a component of the run-flat core assembly. It is an expanded sectional view of the core which follows the III-III line in FIG. FIG. 4 is an enlarged cross-sectional view of core connecting means taken along line IV-IV in FIG. It is sectional drawing which shows the modification of the washer used with the connection means. It is a front view of the core concerning 2nd Embodiment of this invention. It is an expanded sectional view of the core concerning 3rd Embodiment of this invention. It is sectional drawing which expands and shows the principal part of FIG. It is a front view of the core concerning 4th Embodiment of this invention. FIG. 10 is an enlarged cross-sectional view of the core along the line XX in FIG. 9.

Hereinafter, a run-flat core assembly according to a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a vehicle wheel of a small truck called a lateral loading type. The vehicle wheel includes a wheel body 1 and a tire 2 that is loaded by being moved laterally in the axial direction with respect to the wheel body 1.

  In the rim 1a of the wheel body 1, the central portion in the wheel axial direction is provided as a mounting portion of a ring-shaped run-flat core assembly 4 (hereinafter simply referred to as a core assembly). A core assembly 4 is mounted via an annular buffer pad 3 made of rubber or resin.

The core assembly 4 is configured by connecting a plurality of cores having equal circumferences, for example, three arc-shaped cores 10 to each other.
As shown in FIGS. 2 and 3, the core 10 has an arc-shaped core body 11, and an arc-shaped deformation planned portion 12 disposed on the inner peripheral side of the core body 11. It has.

  The core body 11 and the planned deformation portion 12 are formed separately, for example, by casting an aluminum alloy (metal), and both are hollow and have a rectangular cross section.

  As best shown in FIG. 3, the core body 11 and the planned deformation portion 12 have the same wheel axial dimension (ie, width) W. The wheel radial direction dimension (that is, height) H2 of the planned deformation portion 12 is smaller than the dimension H1 of the core body 11.

  The core body 11 is thick and has high rigidity. On the other hand, the planned deformation portion 12 is thinner than the core body 11 and has a lower rigidity than the core body 11. For this reason, the core body 11 maintains its shape with respect to an excessive impact load described later, whereas the planned deformation portion 12 is plastically deformed.

  The said deformation | transformation scheduled part 12 is attached so that relative position shift may not arise with respect to the core main body 11 by the welding in the circumferential direction and the width direction (wheel axial direction). In this embodiment, as shown in FIG. 2, it is attached by welding at a plurality of locations at intervals in the circumferential direction (the welding location is indicated by reference numeral 19 in FIG. 2). The planned deformation portion 12 can be replaced.

  As best shown in FIG. 2, the core body 11 has first and second connecting portions 13 and 14 at both ends in the wheel circumferential direction. The positions of the connecting portions 13 and 14 in the wheel axial direction are different, the first connecting portion 13 is located on the front side of the paper surface in FIG. 2, and the second connecting portion 14 is located on the side away from the paper surface. Through holes 13a and 14a are formed in the connecting portions 13 and 14 along the wheel axial direction.

The angle between the centers of the through holes 13a and 14a of the core body 11 is 120 °.
The circumference of the planned deformation portion 12 is shorter than that of the core body 11 and is substantially equal to the circumference of the core body 11 excluding the connecting portions 13 and 14.

  Next, the connecting means 20 for connecting the connecting portions 13 and 14 of the adjacent cores 10 will be described with reference to FIGS. The connecting means 20 includes through holes 13a and 14a of the connecting portions 13 and 14, bolts 21 inserted through the through holes 13a and 14a, nuts 22 screwed into the bolts 21, and a pair of washers 23. Have.

  The inner diameters of the through holes 13a and 14a of the connecting portions 13 and 14 are larger than the outer diameter of the bolt 21, and the bolt 21 is inserted through the through holes 13a and 14a through an annular gap.

  The washer 23 is interposed between the head portion of the bolt 21 and one connecting portion (for example, the first connecting portion 13) and between the nut 22 and the other connecting portion (for example, the second connecting portion 14). ing.

  The washer 23 is formed of a resin having a small friction coefficient, or a metal surface is coated with a low friction material, and a disk-shaped base portion 23a having a through hole 23x formed at the center thereof, and the base portion. It has an annular flange 23b (locking portion) provided on one surface of 23a. The flange portion 23b is coaxial with the through hole 23x and protrudes in a direction orthogonal to the base portion 23a.

The through hole 23 x of the washer 23 has substantially the same diameter as the bolt 21.
The outer diameter of the flange 23b of the washer 23 is equal to the through holes 13a and 14a of the mounting parts 13 and 14, and the inner diameter thereof is larger than the diameters of the through hole 23x and the bolt 21.

  The base portion 23a of the pair of washers 23 is in contact with the outer surfaces of the connecting portions 13 and 14, and the washer 23b is inserted into the through holes 13a and 14a of the connecting portions 13 and 14, so that the washer 23 penetrates. By tightening the bolts 21 and nuts 22 that pass through the holes 23x and the through holes 13a and 14a of the connecting portions 13 and 14, the connecting portions 13 and 14 are connected, and the adjacent cores 10 are connected.

  In the vehicle wheel having the above-described configuration, when the tire 2 is traveling with sufficient air pressure, the tread portion 2a of the tire 2 does not hit the outer periphery of the core assembly 4 having a cylindrical surface. Stable driving.

  When the tire 2 is punctured, the vehicle travel can be continued with the tread portion 2a of the tire 2 supported by the core assembly 4. During this travel, a load resulting from the vehicle weight and the loaded weight is applied to the core assembly 4, but the core body 11 as well as the planned deformation portion 12 can sufficiently withstand this load, and its shape is Can be maintained. In addition, even if there is an impact from the road surface, if it is less than a predetermined level, the deformation planned portion 12 can maintain its shape, and as in the case of using a normal run-flat core, stable vehicle travel can be achieved. Can continue.

  Further, when the vehicle travels with the tread portion 2a of the tire 2 supported by the core assembly 4, a load is also applied to the connecting means 20, but the flange portion 23b of the washer 23 can withstand this load. For this reason, the connecting portions 13 and 14 of the adjacent cores 10 are not relatively displaced, and the through holes 13a and 14 of the connecting portions 13 and 14 can maintain a normal connection state in which they are coaxial. As a result, the outer periphery of the core assembly 4 is maintained in a perfect circle that is coaxial with the wheel shaft, and the tread portion 2a of the tire 2 is stably supported by the core assembly 4.

  As described above, when the vehicle travels at a vehicle speed that causes the springs of the vehicle to resonate while riding on a road fence in which the tires 2 are equally spaced, an excessive and local impact load is applied to the tire 2 from the road fence. May be granted. In such a case, the thin deformation target portion 12 to which the impact load is transmitted from the highly rigid core body 11 is plastically deformed. Specifically, the main plastic deformation occurs on the pair of side walls. Since the impact energy is absorbed by the plastic deformation of the planned deformation portion 12, the impact on the tread portion 2a of the tire 2 is alleviated and the destruction thereof is prevented.

  At the same time as or before and after the planned deformation portion 12 is plastically deformed by the impact load, the flange portion 23b of the washer 23 is deformed or destroyed in the at least one connecting means 20. As a result, the relative displacement of the connecting portions 13 and 14 occurs, and as a result, the relative displacement between the adjacent core bodies 11 occurs. Thereby, the plastic deformation of the said deformation | transformation scheduled part 12 is performed without trouble.

Even if the plastic deformation of the deformation planned portion 12 occurs, the core body 11 is highly rigid and can maintain its shape. Therefore, the tread portion 2b of the tire 2 can be supported by the outer peripheral surface forming a substantially circular arc, and traveling can be continued without damaging the tread portion 2b.
The impact energy absorption effect by plastic deformation of the planned deformation portion 12 is not only for tire punctures, but also for excessive and local impact loads when the vehicle is running in a state where the tire air pressure is greatly reduced. It is demonstrated in the same way.

  FIG. 5 shows a modification of the washer 23 used in the connecting means 20. The base end portion (base portion 23a side) of the flange portion 23b of the washer 23 is cut out at the outer periphery to form a thin-walled portion 23y, which is easily broken when the deformable portion 12 is plastically deformed. Yes.

  In 1st Embodiment mentioned above, you may make it easy to carry out plastic deformation by forming a some hole in the pair of side wall of the deformation | transformation scheduled part 12 of the core 10 at intervals in the circumferential direction. In this case, the thickness of the deformation planned portion 12 may be approximately the same as that of the core body 11, or may be thinner than the core body 11 as in the first embodiment.

  Next, another embodiment of the present invention will be described with reference to FIGS. In these embodiments, components corresponding to the preceding embodiments are assigned the same reference numerals and detailed description thereof is omitted.

  FIG. 6 shows the core 10 according to the second embodiment. The original cross-sectional shape of the pair of side walls of the planned deformation portion 12 of the core 10 is formed by bending, and is easily plastically deformed. In the illustrated example, the pair of side walls are bent inward, but the pair of side walls may be bent outward, or one side wall may be bent inward and the other side wall may be bent outward.

  In the third embodiment shown in FIGS. 7 and 8, the planned deformation portion 12 is not welded to the core body 11, and the detachability with respect to the core body 10 is improved compared to the first embodiment. Can be easily exchanged when it is plastically deformed.

  As shown in FIG. 7, the planned deformation portion 12 has a flat plate-shaped flange portion 12 c protruding from the pair of side walls in the wheel radial direction and the outward direction, and these flange portions 12 c are both side surfaces of the core body 11. By hitting, the position shift in the width direction (wheel axis direction) is prevented.

As shown in FIG. 8, a plurality of holes 12x are formed in the flange portion 12c at intervals in the circumferential direction, and the holes 12x are formed at intervals in the circumferential direction on both side surfaces of the core body 11. By being fitted to the conical convex portion 11x, the displacement in the circumferential direction of the deformable portion 12 is also prevented.
Further, due to the engagement between the hole 12x and the convex portion 11x, the deformable portion 12 can be attached to the wheel 1 integrally with the core body 11.

9 to 10 show a core 10 according to a fourth embodiment of the present invention. In the core 10, the core body 11 and the planned deformation portion 12 are made of different members and are not connected. Only the inner periphery of the core body 11 is in contact with the outer periphery of the portion to be deformed.
The said deformation | transformation plan part 12 has the convex part 12d which protruded in the wheel radial direction and the outward direction from a pair of side wall, and when this convex part 12d hits the both sides | surfaces of the core main body 11, a width direction (wheel axis | shaft) is carried out. Misalignment in the direction) is prevented.
Moreover, the deformation | transformation scheduled part 12 has the convex part 12e which protruded in the wheel radial direction and the outward direction also in the circumferential direction both ends, and this convex part 12e is the connection part 13 in the circumferential direction both end surface of the core main body 11. , 14 hits a portion where no contact is formed, thereby preventing a circumferential displacement.

The present invention is not limited to the above-described embodiments, and various aspects can be adopted. The means for changing the rigidity of the core body 11 and the planned deformation portion 12 may be a difference in thickness in the first embodiment, a difference in shape in the second and third embodiments, or a difference in material. A combination of these may also be used.
The washer 23 of the connecting means 20 may not have the flange 23b. In this case, when the mounting portions 13 and 14 are maintained in the reference connection state by the tightening force of the bolt 21 and the nut 22 and an impact load is applied, the gap between the bolt 21 and the through holes 13a and 14a of the mounting portions 13 and 14 is maintained. The relative displacement of the mounting portions 13 and 14 is allowed by this amount.
The core body and the portion to be deformed may be integrally cast. In this case, taking the first embodiment as an example, the bottom wall (inner peripheral wall) of the core body and the ceiling wall (outer peripheral wall) of the planned deformation portion are combined into one wall.
The number of cores may be not only 3 as in the above embodiment, but also 2 or 4-6.

  The present invention can be applied to a run flat wheel that enables a vehicle to travel during tire puncture.

DESCRIPTION OF SYMBOLS 1 Wheel 2 Tire 2a Tread part 4 Run-flat core assembly 10 Core 11 Core main body 12 Deformation scheduled part 13,14 Connection part 13a, 14a Through-hole 20 Connection means 21 Bolt 22 Nut 23 Washer 23b Eave part (engagement) Stop)

Claims (1)

In a run-flat core assembly that is attached to the rim of the wheel in an annular shape by connecting a plurality of cores having an arc shape in the circumferential direction and connecting them together,
Each of the cores includes a highly rigid core body that faces the tread portion of the tire, and a deformable portion that is disposed on the inner peripheral side of the core body and has a lower rigidity than the core body. In addition, when an excessive impact load is applied, the deformation planned portion is plastically deformed ,
The connecting portions are provided so as to protrude in the circumferential direction from both ends in the wheel circumferential direction of the core body, and are connected by connecting means in a state where the connecting portions of adjacent cores face each other in the wheel axial direction. ,
A. A through hole formed in each of the pair of connecting portions and extending in the wheel axial direction;
A. A bolt that penetrates the through hole of the pair of connecting portions;
C. A nut that is screwed onto the bolt and that cooperates with the bolt to tighten the pair of connecting portions;
D. A washer interposed between at least one of the pair of connecting portions and the head of the bolt and between the other connecting portion and the nut;
With
The through hole of at least one connecting portion is larger than the diameter of the bolt, and the washer is engaged with the inner periphery of the through hole of the one connecting portion to inhibit relative displacement between the washer and the one connecting portion. When the locking portion is deformed or destroyed by an impact load, the relative displacement between the connecting portions of the adjacent cores is allowed, and as a result, the relative displacement between the adjacent cores is allowed. A core assembly for run-flat that is characterized.

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