JP2010208558A - Non-pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-pneumatic tire ensuring excellent ride quality, steerability and durability by suppressing increase in weight, hardness and rolling resistance, and preventing occurrence of flat tire while equalizing the distribution of the ground contact pressure, and easily assembled. <P>SOLUTION: In the non-pneumatic tire 1, a plurality of connection members 13 for connecting a fitting body 11 to a ring-shaped body 12 are provided along the tire circumferential direction. Each connection member 13 comprises a first connection plate 21 and a second connection plate 22. The other ends 21b, 22b of the first connection plate 21 and the second connection plate 22 are arranged in a plurality of storage grooves 34 formed in an outer circumferential surface of the fitting body 11 with the spacing in the tire circumferential direction, and connected to the fitting body 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a non-pneumatic tire that does not need to be filled with pressurized air when used.

In a conventional pneumatic tire that is used while being filled with pressurized air, the occurrence of puncture is an unavoidable problem in structure.
Therefore, as a non-pneumatic tire capable of preventing the occurrence of puncture, a so-called solid tire having a solid structure filled with a rubber material has been proposed, for example, as shown in Patent Document 1 below.

JP-A-6-293203

  However, the conventional non-pneumatic tires are heavier than pneumatic tires, and also have increased hardness and rolling resistance, which greatly deteriorates ride comfort and maneuverability, making it difficult to apply to general vehicles. Its scope of application was limited.

  The present invention has been made in consideration of such circumstances, and suppresses an increase in weight, hardness, and rolling resistance to ensure good riding comfort, maneuverability, and durability, and a contact pressure distribution. An object of the present invention is to provide a non-pneumatic tire that can prevent the occurrence of puncture while achieving equalization and that can be easily assembled.

  In order to solve the above problems and achieve such an object, a non-pneumatic tire of the present invention includes an attachment body attached to an axle, and a ring-like body surrounding the attachment body from the outside in the tire radial direction. A non-pneumatic tire provided with a plurality of connecting members that are provided along the tire circumferential direction and connect the attachment body and the ring-shaped body, and the connecting member removes the tire from its axial direction. In the seen tire side view, the first connecting plate curved to be convex toward one side in the tire circumferential direction, and the second connecting plate curved to be convex toward the other side, One end of each of these connecting plates is connected to the inner peripheral surface of the ring-shaped body, the other end is connected to the mounting body, and a storage groove is formed on the outer peripheral surface of the mounting body. Spacing in the tire circumferential direction Formed in plurality, each other ends of the two joining plates is characterized by being connected to the mounting body by being arranged in the receiving groove.

In this invention, the non-pneumatic tire has a solid structure in which the attachment body and the ring-shaped body are connected by a plurality of connecting members provided along the tire circumferential direction, and the inside is filled with a rubber material. Therefore, it is possible to prevent the occurrence of puncture while suppressing the increase in weight, hardness and rolling resistance and ensuring good riding comfort and maneuverability.
In addition, the connecting member is a first connecting plate that is curved so as to be convex toward one side in the tire circumferential direction, and a second connecting plate that is curved so as to be convex toward the other side in the tire side view. Therefore, when an external force acts on the non-pneumatic tire and the attachment body and the ring-shaped body are relatively displaced in the tire radial direction, the tire circumferential direction, or the tire width direction, this displacement Accordingly, the first connecting plate and the second connecting plate can be easily elastically deformed, the non-pneumatic tire can be provided with flexibility, and transmission of vibrations to the vehicle can be suppressed. Riding comfort can be reliably ensured.
Further, since the other end portions of the both connection plates are connected to the attachment body by being disposed in the storage groove, the other end portions of the connection plates are connected to the attachment body by, for example, bonding or adhesion. Compared with the case where it connects with an outer peripheral surface, while being able to attach each other end part of both connection plates to a mounting body with high precision, it becomes possible to attach and detach easily.
In addition, since the other end portions of the two connection plates are arranged in the storage groove and connected to the attachment body in this way, the other end portions of the two connection plates are attached to the attachment body by, for example, bonding or adhesion. Compared with the case where it connects with the outer peripheral surface of this, it becomes possible to suppress the attachment margin of each other end part of the both connection plates which occupies the outer peripheral surface of an attachment body narrowly. Therefore, while maintaining the number of connecting members and the outer diameter of the attachment body, it is possible to easily realize that the attachment allowance is widened to improve the connection strength between the other end portions of both connection plates and the attachment body. it can.
In addition, when each connecting member is axisymmetric with respect to a virtual line extending along the tire radial direction in the tire side view, the spring along one side in the tire circumferential direction of the non-pneumatic tire It is possible to suppress the difference between the constant and the spring constant along the other side. Therefore, with this non-pneumatic tire in contact with the ground, it is possible to suppress the difference between the spring constant along the traveling direction and the spring constant along the braking direction at the ground contact portion of the tire, thereby ensuring good maneuverability. Can be secured.

Furthermore, since the other end portions of the both connecting plates are connected to the mounting body by being disposed in the storage groove, the storage groove is cut from the outer peripheral surface of the mounting body toward the inside thereof. In the case of non-penetrating forward in the direction, when an external force such as the weight of the vehicle body acts on the non-pneumatic tire, the attachment body and the ring-shaped body move relatively closer to each other in the tire radial direction. It becomes possible to make each other end part of a connecting plate contact | abut to the front end surface of the said cutting direction among the wall surfaces which define a storage groove. Therefore, compared with the case where the other end portions of both connection plates are connected to the outer peripheral surface of the attachment body by, for example, bonding or adhesion, the durability of the connection portion between each other end portion of both connection plates and the attachment body and its Strength can be improved.
In addition, when the storage groove is cut from the outer peripheral surface of the attachment body toward the inside along the direction from the other end to the one end side at each of the other end portions of the both connecting plates, Each other end of the connecting plate can be easily entered into the storage groove, and the cost increase of the non-pneumatic tire can be suppressed. Further, when the other end portions of both connecting plates are formed flat or in a single arc shape, both connecting plates can be easily formed, and the cost of the non-pneumatic tire is increased. Can be reliably suppressed.

Here, the attachment body may be formed with a female screw portion that opens into the housing groove, and the other end portions of the two connecting plates may be fixed by fixing bolts screwed to the female screw portion.
In this case, since the other end portions of both connecting plates are fixed by fixing bolts screwed to the female screw portions, it is possible to reliably prevent the other end portions of both connecting plates from coming out of the storage grooves. be able to.

Further, each end portion of the first connecting plate and the second connecting plate in one connecting member is different from each other in the tire width direction at the same position in the tire circumferential direction on the inner peripheral surface side of the ring-shaped body. Each of the connecting members is connected to each other, and a plurality of the first connecting plates are arranged at one tire width direction position along the tire circumferential direction, and the second connecting plate is arranged at another tire width direction position in the tire circumferential direction. A plurality may be provided along the tire circumferential direction so as to be arranged along the tire circumference.
In this case, each one end part of both connecting plates in one connecting member is connected to each other at different positions in the tire width direction at the same position in the tire circumferential direction on the inner peripheral surface side of the ring-shaped body, A plurality of first connecting plates are arranged along the tire circumferential direction at one tire width direction position, and a plurality of second connecting plates are arranged along the tire circumferential direction at other tire width direction positions. In addition, since a plurality of tires are provided along the tire circumferential direction, it is possible to suppress interference between connecting members adjacent in the tire circumferential direction, and it is possible to prevent the number of arrangement members from being limited.
In this configuration, when a tread member is disposed on the outer peripheral surface side of the ring-shaped body as will be described later, it becomes possible to easily disperse the contact pressure acting on the tread member in the tire width direction. Further, uneven wear can be prevented from occurring in the tread member.

Furthermore, the storage groove is formed separately at both ends in the tire width direction on the outer peripheral surface of the attachment body, and opens toward the outside in the tire width direction, and the other end portions of the two connection plates are In the state of facing or abutting from the outer side in the tire width direction to the inner wall surface facing the outer side in the tire width direction among the wall surfaces defining the storage groove, respectively connected to both ends of the mounting body in the tire width direction. Also good.
In this case, an external force acts on the non-pneumatic tire so that the attachment body and the ring-shaped body are relatively largely displaced in the tire width direction, and one other end portion of the two connection plates is disengaged from the storage groove. Even if the position is shifted toward the outer side in the tire width direction and the other end of the other is in contact with the inner wall surface of the storage groove, the other end of the other is prevented from being removed from the storage groove. Can do.

The ring-shaped body is divided into a large number of ring divided bodies along the tire circumferential direction. The ring-shaped body extends along the tire circumferential direction and the large number of ring divided bodies. An elastic member that connects the body in the tire circumferential direction may be provided.
In this case, since the ring-shaped body is divided into a large number of ring divided bodies along the tire circumferential direction, the flexibility of the ring-shaped body is enhanced, and the first is determined according to the external force acting on the non-pneumatic tire. Not only the connecting plate and the second connecting plate but also the ring-shaped body can be easily deformed. Therefore, it is possible to suppress variations in the contact pressure within the contact surface, and it is possible to more reliably ensure good riding comfort, and to provide a tread member on the outer peripheral surface side of the ring-shaped body as described later. When the is disposed, uneven wear can be prevented from occurring in the tread member.
Further, as described above, since the ring-shaped body is divided into a large number of ring divided bodies along the tire circumferential direction, it is possible to easily form this non-pneumatic tire. When a part of the ring-shaped member is damaged, it is sufficient to replace only the damaged portion without replacing the entire ring-shaped body, and it is possible to improve maintainability.
In addition, the ring-shaped body is provided with an elastic member extending along the tire circumferential direction and connecting a large number of ring divided bodies in the tire circumferential direction, so that the deformation amount of the ring-shaped body is regulated. Since the ring-shaped body is divided into a large number of ring divided bodies, the flexibility of the ring-shaped body can be suppressed from becoming excessively high.
Therefore, it is possible to reliably suppress variations in contact pressure and vibrations in the contact surface, and to increase the rolling resistance of non-pneumatic tires by dividing the ring-shaped body into a plurality of ring divided bodies. Or an increase in the load applied to both connecting plates can be suppressed.
Among these, since it becomes possible to suppress an increase in the load on both connecting plates, in order to divide the ring-shaped body into a large number of ring divided bodies, the bending rigidity of both connecting plates is increased and the It is not necessary to improve the durability, and it is possible to suppress an increase in the weight of these connecting plates. Therefore, it is possible to prevent the weight of the non-pneumatic tire from increasing as the ring-shaped body is divided into a large number of ring divided bodies.
In addition, since a large number of ring segments are connected in the tire circumferential direction by elastic members rather than rigid bodies, it is possible to prevent the contact area from being greatly reduced and the load received from the road surface is elastic. By being dispersed over a wide range of the non-pneumatic tire through the member, it is possible to prevent a portion where a large load is locally applied, and durability can be improved.

Furthermore, a tread member is disposed on the outer peripheral surface side of the ring-shaped body, and a clearance in the tire circumferential direction is provided between ring divided bodies adjacent in the tire circumferential direction, and the elasticity A gap in the tire radial direction may be provided between a portion of the member positioned between the ring divided bodies adjacent in the tire circumferential direction and the inner peripheral surface side of the tread member.
In this case, since the tread member is arranged on the outer peripheral surface side of the ring-shaped body over the entire circumference, it is possible to reliably improve riding comfort, grip performance, and durability of the non-pneumatic tire.
Moreover, since the clearance of the tire circumferential direction is provided between the ring division bodies adjacent in a tire circumferential direction, it becomes possible to improve the softness | flexibility of a non-pneumatic tire reliably. Moreover, since the clearance of a tire radial direction is provided between the part located between the ring division bodies adjacent in a tire circumferential direction in an elastic member, and the inner peripheral surface side of a tread member, it receives from a road surface. A load can be reliably transmitted to both the connecting plates, and the above-described effects can be reliably achieved, and a tread member can be easily mounted on the outer peripheral surface side of the ring-shaped body.

The elastic member may be divided into a plurality of elastic divided bodies along the tire circumferential direction.
In this case, since the elastic member is divided into a large number of elastic divided bodies along the tire circumferential direction, the elastic member having the above-described effects can be easily formed and can be easily mounted. it can.

  According to the present invention, the increase in weight, hardness and rolling resistance is suppressed to ensure good riding comfort, maneuverability and durability, and the occurrence of puncture is prevented while equalizing the contact pressure distribution. It is possible and can be assembled easily.

In one Embodiment which concerns on this invention, it is the schematic perspective view which decomposed | disassembled some non-pneumatic tires. It is a schematic perspective view which shows a part of non-pneumatic tire of FIG. It is the front view which looked at some non-pneumatic tires shown in Drawing 1 and Drawing 2 from the tire width direction. FIG. 4 is a side view of a part of the non-pneumatic tire shown in FIG. 3. FIG. 4 is an enlarged sectional view of a part X of the non-pneumatic tire shown in FIG. 3.

Hereinafter, an embodiment of a non-pneumatic tire according to the present invention will be described with reference to FIGS. 1 to 5.
The non-pneumatic tire 1 includes a mounting body 11 attached to an axle (not shown), a ring-shaped body 12 surrounding the mounting body 11 from the outside in the tire radial direction, and a plurality of mounting bodies 11 provided along the tire circumferential direction. A connecting member 13 that connects the outer peripheral surface side and the inner peripheral surface 12b side of the ring-shaped body 12, a tread member 14 disposed on the outer peripheral surface 12c side of the ring-shaped body 12 over the entire circumference, and the ring-shaped body 12 And a reinforcing layer 15 disposed between the tread member 14 and the tread member 14.
The attachment body 11, the ring-shaped body 12, the tread member 14, and the reinforcing layer 15 are each formed with the same size in the tire width direction H and are coaxial with the axis O in the tire width direction H. The central portions are arranged to coincide with each other.

  The attachment body 11 is formed in a cylindrical shape, and a plurality of ribs 11 a extending along the tire radial direction and having both ends connected to the inner peripheral surface of the attachment body 11 are provided inside the attachment body 11. These ribs 11a are arranged point-symmetrically with respect to the axis O. A mounting hole 11b into which the front end of the axle is fitted is formed at the center in the tire radial direction where the plurality of ribs 11a intersect inside the mounting body 11. The attachment body 11 and the rib 11a are integrally formed of a metal material such as an aluminum alloy.

The tread member 14 is formed in a cylindrical shape, and integrally covers the outer peripheral surface 12c side of the ring-shaped body 12 over the entire region. The tread member 14 is made of, for example, vulcanized rubber obtained by vulcanizing natural rubber and / or a rubber composition, or a thermoplastic material. Examples of the thermoplastic material include a thermoplastic elastomer or a thermoplastic resin. Examples of the thermoplastic elastomer include an amide-based thermoplastic elastomer (TPA), an ester-based thermoplastic elastomer (TPC), an olefin-based thermoplastic elastomer (TPO), a styrene-based thermoplastic elastomer (TPS), and urethane as defined in JIS K6418. Examples thereof include a thermoplastic elastomer (TPU), a crosslinked thermoplastic rubber (TPV), and other thermoplastic elastomers (TPZ). Examples of the thermoplastic resin include urethane resin, olefin resin, vinyl chloride resin, and polyamide resin. In addition, it is preferable to form the tread member 14 with vulcanized rubber from the viewpoint of wear resistance.
The reinforcing layer 15 includes a rubber sheet formed in a cylindrical shape, and a steel cord embedded in a plurality of rows in the rubber sheet. The reinforcing layer 15 is in close contact with the inner peripheral surface of the tread member 14 and the outer peripheral surface 12c of the ring-shaped body 12 by elastic restoring forces of both connecting plates 21 and 22 described later. The reinforcing layer 15 may be formed integrally with the tread member 14.

  The connecting member 13 includes a first connecting plate 21 curved so as to be convex toward one side in the tire circumferential direction and a second connecting plate curved so as to be convex toward the other side in the tire side view. 22. Each of the first connection plate 21 and the second connection plate 22 is formed of, for example, a metal material or a resin material that has almost no hysteresis loss. One end portions 21 a and 22 a of both the connecting plates 21 and 22 are connected to the inner peripheral surface 12 b side of the ring-shaped body 12, and the other end portions 21 b and 22 b are connected to the attachment body 11.

  In each of the connecting plates 21 and 22, the intermediate portion positioned between the one end portion 21a and 22a and the other end portion 21b and 22b is curved so as to be convex in the tire circumferential direction as described above. In this intermediate portion, the one end side portion located on the one end portion 21a, 22a side has a larger radius of curvature in the tire side view than the other end side portion located on the other end portion 21b, 22b side, and is longer. Is getting longer. The one end portions 21a and 22a of the connecting plates 21 and 22 are connected to one end of the intermediate portion via a bent portion, and are directed toward the opposite side of the tire circumferential direction in which the intermediate portion is curved and convex. It is extended. The other end portions 21b, 22b of both the connecting plates 21, 22 are smoothly connected to the other end of the intermediate portion and extend in a direction substantially orthogonal to the one end portions 21a, 22a. In addition, the one end parts 21a and 22a and the other end parts 21b and 22b in both the connecting plates 21 and 22 are each formed in a flat or single arc shape.

  The one end portions 21 a and 22 a of the first connecting plate 21 and the second connecting plate 22 in one connecting member 13 are connected to the same position in the tire circumferential direction on the inner peripheral surface 12 b side of the ring-shaped body 12. These one end portions 21a and 22a are connected to the inner peripheral surface 12b side of the ring-shaped body 12 with different positions in the tire width direction H from each other. In the illustrated example, the one end portions 21 a and 22 a of the first connecting plate 21 and the second connecting plate 22 in one connecting member 13 are at both end portions in the tire width direction H on the inner peripheral surface 12 b side of the ring-shaped body 12. They are linked separately.

The shape of each connecting member 13 in the side view of the tire is line-symmetric with respect to an imaginary line L that extends through the tire circumferential direction center portion of the connecting member 13 along the tire radial direction, as shown in FIG. It has become. The imaginary line L passes through the one end portions 21a and 22a of the connecting plates 21 and 22 and the axis O.
That is, the lengths of both the connecting plates 21 and 22 are equal to each other, and the other end portions 21b and 22b of the both connecting plates 21 and 22 are arranged on the outer peripheral surface of the mounting body 11 in the tire side view. Each position is spaced apart from each end 21a, 22a in the tire radial direction by the same angle (for example, 20 ° to 135 °) on one side and the other side in the tire circumferential direction around the axis O. It is connected separately. When this angle is set to 20 ° or more and 90 ° or less, for example, both the connecting plates adjacent to each other in the tire circumferential direction can be reduced while reducing the weight of the non-pneumatic tire 1 while securing a large number of connecting members 13. It is possible to prevent interference between the two 21 and 22. Further, the other end portions 21 b and 22 b of both the connecting plates 21 and 22 are respectively connected to both end portions in the tire width direction H on the outer peripheral surface of the attachment body 11.

  The plurality of connecting members 13 are separately arranged between the attachment body 11 and the ring-shaped body 12 at positions that are point-symmetric with respect to the axis O. Further, the connecting member 13 includes a plurality of first connecting plates 21 arranged along the tire circumferential direction at a position in one tire width direction H, and the second connecting plate 22 is a position in the one tire width direction H. A plurality (60 in the illustrated example) are provided along the tire circumferential direction so that a plurality of different tire width directions H are arranged along the tire circumferential direction. Furthermore, all the connecting members 13 have the same shape and size.

  Further, the first connecting plates 21 adjacent in the tire circumferential direction are substantially parallel to each other and opposed in the tire circumferential direction, and the second connecting plates 22 adjacent in the tire circumferential direction are also substantially parallel to each other. Opposing in the circumferential direction. Further, a plurality of first connection plates 21 are disposed at one end in the tire width direction H of the non-pneumatic tire 1, and the second connection plate 22 is the other end of the non-pneumatic tire 1 in the tire width direction H. A plurality are arranged in the section.

  The sizes of the first connecting plate 21 and the second connecting plate 22 in the tire width direction H (the direction of the axis O), that is, the widths thereof are equal to each other. The thicknesses of the first connecting plate 21 and the second connecting plate 22 are also equal to each other. Furthermore, in each of these connection plates 21 and 22, the widths of the one end portions 21a and 22a and the other end portions 21b and 22b are larger than the intermediate portions located between them.

  The ring-shaped body 12 is divided into a large number of ring divided bodies 12a along the tire circumferential direction. The ring divided body 12a is formed of a metal material, and its size in the tire radial direction, that is, its thickness is larger than the thickness of both the connecting plates 21 and 22. Moreover, the both ends of the tire width direction H in the back surface of the ring division body 12a which comprises the internal peripheral surface 12b of the ring-shaped body 12 are depressed. Further, a gap in the tire circumferential direction is provided between the ring divided bodies 12a adjacent in the tire circumferential direction. Furthermore, each one end part 21a, 22a of both the connection plates 21 and 22 in one connection member 13 is connected separately to both ends in the tire width direction H on the back surface of one ring divided body 12a.

Here, in the present embodiment, the one end portions 21a and 22a of the connecting plates 21 and 22 are ring-shaped by bolts 31 inserted from the outside in the tire radial direction into the insertion holes 33 formed in the ring-shaped body 12. The body 12 is connected to the inner peripheral surface 12b side.
In the example shown in the drawing, a female screw member 32 having a female screw is disposed on each of the one end portions 21a and 22a of the connecting plates 21 and 22, and a first through hole is formed. Then, the bolt 31 inserted into the insertion hole 33 as described above is screwed into the female screw of the female screw member 32 through the first through hole, whereby each of the one end portions 21a of both the connecting plates 21 and 22; 22 a is sandwiched between the female screw member 32 and the ring-shaped body 12 in the tire radial direction and connected to the inner peripheral surface 12 b side of the ring-shaped body 12.

The outer portion of the insertion hole 33 located outside in the tire radial direction is a counterbore hole 33a, and the head of the bolt 31 is accommodated in the counterbore hole 33a. That is, the counterbore hole 33 a is a recess that houses the head of the bolt 31. In the illustrated example, the counterbore hole 33a is gradually reduced in diameter toward the inner side in the tire radial direction, and the head of the bolt 31 is a countersunk bolt formed in an inverted truncated cone shape.
The female screw member 32 is a plate body on which a plurality of female screws are formed, and a plurality of bolts 31 are provided. In the illustrated example, the female screw member 32 is formed in a rectangular shape in plan view that is long in the tire width direction H, and two female screws are formed at intervals in the tire width direction H. Note that two first through holes are formed at one end portions 21a and 22a of the connecting plates 21 and 22 at intervals in the tire width direction H, respectively.

In the ring-shaped body 12, there is provided an elastic member 16 that extends over the entire circumference along the tire circumferential direction and connects a large number of ring divided bodies 12a in the tire circumferential direction. The elastic member 16 is made of, for example, a metal material, natural rubber or / and vulcanized rubber obtained by vulcanizing a rubber composition, or a thermoplastic material. Examples of the metal material include aluminum and stainless steel. Examples of the thermoplastic material include the aforementioned thermoplastic elastomers or thermoplastic resins.
In the example shown in the drawing, the elastic members 16 are disposed separately at both ends in the tire width direction H in the ring-shaped body 12. Further, a gap in the tire radial direction is provided between a portion of the elastic member 16 located between the ring divided bodies 12 a adjacent in the tire circumferential direction and the inner peripheral surface of the reinforcing layer 15.

  The elastic member 16 is divided into a large number of elastic divided bodies 16a along the tire circumferential direction, and each elastic divided body 16a is a plate body having a rectangular shape in plan view long in the tire circumferential direction, as shown in FIG. Thus, one elastic division body 16a has connected two ring division bodies 12a in the tire peripheral direction. Further, by connecting the two elastic divided bodies 16a to one ring divided body 12a, the elastic member 16 extends over the entire circumference in the tire circumferential direction, and a large number of ring divided bodies 12a are connected to the entire tire circumferential direction. It is connected over the circumference. In addition, two second through holes are formed at both ends in the tire circumferential direction of the elastic divided body 16a at intervals in the tire width direction H. The bolt 31 inserted into the insertion hole 33 as described above is screwed into the female screw of the female screw member 32 through the first through hole and the second through hole.

In the present embodiment, a plurality of storage grooves 34 are formed on the outer peripheral surface of the attachment body 11 at intervals in the tire circumferential direction, and the other end portions 21b and 22b of both the connecting plates 21 and 22 are stored. By being arranged in the groove 34, it is connected to the attachment body 11.
The storage grooves 34 are formed separately at both ends in the tire width direction H on the outer peripheral surface of the attachment body 11 and open toward the outside in the tire width direction H. The other end portions 21b and 22b of the connecting plates 21 and 22 face or contact the inner wall surface facing the outer side in the tire width direction H from the outer side in the tire width direction H among the wall surfaces defining the storage groove 34. In the state of contact, both ends of the mounting body 11 in the tire width direction H are connected separately.

  Further, the storage groove 34 is non-penetrating forward in the cutting direction of cutting from the outer peripheral surface of the attachment body 11 toward the inside thereof. The cutting direction is substantially the same as the direction from the other end toward the one end 21a, 22a side in each of the other end 21b, 22b of each of the connecting plates 21, 22 among the directions inclined with respect to the tire radial direction. Match. Further, in the outer circumferential surface of the attachment body 11, the storage groove 34 located at one end in the tire width direction H and the storage groove 34 located at the other end in the tire width direction H are arranged in the tire circumferential direction. The formation positions along are different from each other.

  Furthermore, in this embodiment, the female thread part 11c opened in the accommodation groove | channel 34 is formed in the attachment body 11, and each other end part 21b, 22b of both the connection plates 21 and 22 was screwed by this female thread part 11c. The fixing bolt 35 is pressed against the wall surface defining the storage groove 34 and fixed. The female thread portion 11c extends in the cutting direction and in a direction perpendicular to the surfaces of the other end portions 21b and 22b of the connecting plates 21 and 22, and is spaced from the one storage groove 34 in the tire width direction H. Two are opened.

  As described above, according to the non-pneumatic tire 1 according to the present embodiment, the attachment body 11 and the ring-shaped body 12 are connected by the connection members 13 provided in a plurality along the tire circumferential direction. Since it is not a solid structure filled with rubber material, it is possible to prevent the occurrence of puncture while suppressing the increase in weight, hardness and rolling resistance and ensuring good riding comfort and maneuverability .

  In addition, the connecting member 13 is a first connecting plate 21 that is curved so as to be convex toward one side in the tire circumferential direction and a second that is curved so as to be convex toward the other side in the tire side view. Since the connecting plate 22 is provided, external force acts on the non-pneumatic tire 1 so that the attachment body 11 and the ring-shaped body 12 are relatively in the tire radial direction, the tire circumferential direction, or the tire width direction H. When displaced, the first connecting plate 21 and the second connecting plate 22 can be easily elastically deformed in accordance with the displacement, and the non-pneumatic tire 1 can be provided with flexibility. The transmission of vibration to the vehicle can be suppressed, and good ride comfort can be ensured.

  Furthermore, since each connecting member 13 is axisymmetric with respect to the virtual line L in the side view of the tire, the spring constant along one side in the tire circumferential direction and the other side of the non-pneumatic tire 1 are along. It is possible to suppress a difference between the spring constant and the spring constant. Therefore, in a state where the non-pneumatic tire 1 is grounded, the difference between the spring constant along the traveling direction and the spring constant along the braking direction in the grounded portion of the tire 1 can be suppressed, and good maneuverability is achieved. Can be ensured.

  Furthermore, since the ring-shaped body 12 is divided into a large number of ring divided bodies 12 a along the tire circumferential direction, the flexibility of the ring-shaped body 12 is enhanced and the external force acting on the non-pneumatic tire 1 is increased. Accordingly, not only the first connecting plate 21 and the second connecting plate 22 but also the ring-shaped body 12 can be easily deformed. Therefore, it is possible to suppress the variation in the contact pressure within the contact surface, and it is possible to more reliably ensure good riding comfort and to prevent uneven wear on the tread member 14. .

  Furthermore, since the ring-shaped body 12 is divided into a large number of ring divided bodies 12a along the tire circumferential direction as described above, the non-pneumatic tire 1 can be easily formed. When a part of the ring-shaped body 12 is damaged, it is sufficient to replace only the damaged portion without replacing the entire ring-shaped body 12, and it is possible to improve maintainability.

In addition, since the elastic member 16 that extends along the tire circumferential direction and connects a large number of ring divided bodies 12a in the tire circumferential direction is provided in the ring-shaped body 12, the deformation of the ring-shaped body 12 It becomes possible to regulate the amount, and by dividing the ring-shaped body 12 into a large number of ring divided bodies 12a, it is possible to suppress the flexibility of the ring-shaped body 12 from becoming excessively high.
Therefore, the variation in the contact pressure within the contact surface can be reliably suppressed, and the ring-shaped body 12 is divided into a large number of ring divided bodies 12a, thereby increasing the rolling resistance of the non-pneumatic tire 1. Or it can suppress that the load concerning both the connection plates 21 and 22 becomes high.

  Among these, since it becomes possible to suppress that the load concerning both the connection plates 21 and 22 becomes high, in order to divide the ring-shaped body 12 into many ring division bodies 12a, both connection plates 21, It is not necessary to increase the bending rigidity of 22 and improve its durability, and it is possible to suppress an increase in the weight of these connecting plates 21 and 22. Therefore, it is possible to prevent the weight of the non-pneumatic tire 1 from increasing as the ring-shaped body 12 is divided into a large number of ring divided bodies 12a.

  Furthermore, since a large number of ring divided bodies 12a are connected in the tire circumferential direction by elastic members 16 instead of rigid bodies, it is possible to prevent the ground contact area from being greatly reduced, and the load received from the road surface Is distributed over a wide range of the non-pneumatic tire 1 through the elastic member 16, so that it is possible to prevent a portion where a large load is locally applied, and durability can be improved.

  Moreover, each end part 21a, 22a of both the connection plates 21 and 22 in one connection member 13 mutually positions the position of the tire width direction H in the same position in the tire circumferential direction on the inner peripheral surface 12b side of the ring-shaped body 12. Differently connected to each other, a plurality of connecting members 13 are arranged in the tire circumferential direction at the first connecting plate 21 along the tire circumferential direction, and the second connecting plate 22 is positioned at the other tire width direction. Are provided along the tire circumferential direction so as to be arranged along the tire circumferential direction, it becomes possible to suppress interference between the connecting members 13 adjacent in the tire circumferential direction, and the arrangement thereof It is possible to prevent the number from being limited, and it is also possible to further disperse the contact pressure acting on the tread member 14 in the tire width direction H, thereby causing uneven wear on the tread member 14. That can be prevented.

  Furthermore, since the first connecting plate 21 and the second connecting plate 22 are each formed of a metal material or a resin material, it is possible to substantially eliminate the occurrence of hysteresis loss, and to further reduce the rolling resistance. it can.

  Moreover, in this embodiment, since each other end part 21b, 22b of the 1st connection board 21 and the 2nd connection board 22 is connected with the attachment body 11 by arrange | positioning in the accommodation groove | channel 34, for example, joining or Compared with the case where the other end portions 21b, 22b of both the connecting plates 21, 22 are connected to the outer peripheral surface of the attachment body 11 by bonding or the like, the other end portions 21b, 22b of the both connection plates 21, 22 are attached to the attachment body 11. Can be attached with high accuracy and can be easily attached and detached.

  Furthermore, since the other end portions 21b and 22b of the connecting plates 21 and 22 are arranged in the storage groove 34 and connected to the mounting body 11, the connecting plates 21 and 22 are joined by bonding or bonding, for example. Compared to the case where the other end portions 21b and 22b of the connection body 22 are connected to the outer peripheral surface of the attachment body 11, the attachment cost of the other end portions 21b and 22b of the connecting plates 21 and 22 occupying the outer peripheral surface of the attachment body 11 is reduced. It becomes possible to keep it narrow. Therefore, while maintaining the number of connecting members 13 and the outer diameter of the attachment body 11, the attachment allowance is widened to improve the connection strength between the other end portions 21 b and 22 b of both connection plates 21 and 22 and the attachment body 11. It can be easily realized.

  Furthermore, since the storage groove 34 is non-penetrating forward in the cutting direction, an external force such as the weight of the vehicle body acts on the non-pneumatic tire 1 to cause the attachment body 11 and the ring-shaped body 12 to move relative to each other. In other words, the other end portions 21b and 22b of the connecting plates 21 and 22 are brought into contact with the front end surface in the cutting direction among the wall surfaces that define the storage groove 34 when moving closer to the tire radial direction. It becomes possible. Therefore, compared with the case where each other end part 21b, 22b of both connection plates 21, 22 is connected to the outer peripheral surface of the attachment body 11, for example, by bonding or adhesion, the other end part 21b of both connection plates 21, 22; The durability and strength of the connecting portion between 22b and the attachment body 11 can be improved.

  Further, the storage groove 34 is directed from the outer peripheral surface of the mounting body 11 to the inside along the direction from the other end toward the one end 21a, 22a side at each of the other end 21b, 22b of each of the connecting plates 21, 22. Therefore, the other end portions 21b and 22b of both the connecting plates 21 and 22 can be easily entered into the storage groove 34, and the cost increase of the non-pneumatic tire 1 can be suppressed. it can. Furthermore, since the other end portions 21b and 22b of both the connecting plates 21 and 22 are formed in a flat or single arc shape, both the connecting plates 21 and 22 can be easily formed, and non-air The cost increase of the entering tire 1 can be reliably suppressed.

Further, in the present embodiment, the other end portions 21 b and 22 b of both the connecting plates 21 and 22 are formed on the wall surface defining the storage groove 34 by the fixing bolt 35 screwed to the female screw portion 11 c formed on the attachment body 11. Since it is pressed and fixed, it can suppress reliably that each other end part 21b and 22b of both these connection plates 21 and 22 remove | deviates from the accommodation groove | channel 34. FIG.
Furthermore, in the present embodiment, an external force acts on the non-pneumatic tire 1 and the attachment body 11 and the ring-shaped body 12 are relatively displaced relatively in the tire width direction, and the other of the connecting plates 21 and 22 is the other. Even if the end portions 21b and 22b are displaced from the storage groove 34 toward the outside in the tire width direction H, the other end portions 22b and 21b come into contact with the inner wall surface of the storage groove 34. The one other end 21b, 22b can be prevented from being detached from the storage groove 34.

Moreover, in this embodiment, since the clearance of the tire circumferential direction is provided between the ring division bodies 12a adjacent in a tire circumferential direction, it becomes possible to improve the softness | flexibility of the non-pneumatic tire 1 reliably. Further, since a gap in the tire radial direction is provided between a portion of the elastic member 16 located between the ring divided bodies 12a adjacent to each other in the tire circumferential direction and the inner circumferential surface of the reinforcing layer 15, the road surface It is possible to reliably transmit the load received from both the connecting plates 21, 22, and the above-described effects can be reliably achieved. Can be easily mounted.
Furthermore, in this embodiment, since the elastic member 16 is divided into a large number of elastic divided bodies 16a along the tire circumferential direction, the elastic member 16 having the above-described effects can be easily formed, It can be easily installed.
Furthermore, in this embodiment, since the tread member 14 is disposed on the outer peripheral surface side of the ring-shaped body 12 over the entire circumference, the ride comfort, grip performance, and durability of the non-pneumatic tire 1 are improved. It can certainly be improved.

Moreover, in this embodiment, each end part 21a, 22a of both the connection plates 21 and 22 is ring-shaped body 12 with the bolt 31 inserted from the outer side of the tire radial direction in the insertion hole 33 formed in the ring-shaped body 12. Since it is connected to the inner peripheral surface 12b side, the one end portions 21a, 22a of both connecting plates 21, 22 and the inner peripheral surface 12b side of the ring-shaped body 12 can be easily connected and released. Thus, the cost increase of the non-pneumatic tire 1 can be suppressed.
Furthermore, since the head of the bolt 31 is housed in the counterbore hole 33 of the insertion hole 33, it is possible to prevent the head of the bolt 31 from protruding from the outer peripheral surface 12 c of the ring-shaped body 12. Interference between the head of the bolt 31 and the inner peripheral surface of the reinforcing layer 15 can be prevented.

Further, when the bolt 31 is screwed into the female screw of the female screw member 32, the one end portions 21 a and 22 a of both the connecting plates 21 and 22 are sandwiched between the female screw member 32 and the ring-shaped body 12 in the tire radial direction and are ring-shaped. Since it is connected to the inner peripheral surface 12 b side of the body 12, the one end portions 21 a and 22 a of both the connecting plates 21 and 22 can be firmly connected to the inner peripheral surface 12 b side of the ring-shaped body 12.
Furthermore, since the female screw member 32 is a plate body on which a plurality of female screws are formed and a plurality of bolts 31 are provided, the one end portions 21a and 22a of both the connecting plates 21 and 22 and the ring-shaped body 12 are provided. It is possible to prevent an increase in the number of female screw members 32 due to the use of a plurality of bolts 31 in order to increase the connection strength with the inner peripheral surface 12b side.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, instead of the elastic member 16 shown in the embodiment, for example, a bundle wire, a single wire or a stranded wire formed of steel or the like and extended along the tire circumferential direction, or extended along the tire circumferential direction. A coil spring may be used.
Moreover, if the arrangement | positioning position of the elastic member 16 shown in the said embodiment is a position which can connect many ring division bodies 12a in the tire circumferential direction in the ring-shaped body 12, for example, a ring-shaped body The inner peripheral surface 12b of the twelve inner peripheral surface 12b may be changed as appropriate, for example, at the center in the tire width direction H.
The elastic member 16 may be continuously extended over the entire circumference along the tire circumferential direction.

Moreover, in the said embodiment, although the structure provided with the 1st connection plate 21 and the 2nd connection plate 22 respectively as the connection member 13 was shown, it replaces with this and the 1st connection plate is provided in one connection member 13. You may employ | adopt the structure with which 21 and the 2nd connection board 22 were respectively provided with the position of the mutual tire width direction H differing.
A plurality of connecting members 13 may be provided along the tire width direction H between the attachment body 11 and the ring-shaped body 12.

Furthermore, the material which forms the 1st connection board 21 and the 2nd connection board 22 is not restricted to said each embodiment, You may change suitably.
Further, the other end portions 21b and 22b of the first connecting plate 21 and the second connecting plate 22 are opposite to each other, for example, on the outer peripheral surface of the mounting body 11 with the axis O in the tire radial direction instead of the embodiment. May be connected to each of the positions separately, or on the outer peripheral surface of the mounting body 11, the positions facing the one end portions 21 a, 22 a of the first connecting plate 21 and the second connecting plate 22 in the tire radial direction. Or the like.

Furthermore, in place of the embodiment, the reinforcing layer 15 is bonded to the outer peripheral surface 12c of the ring-shaped body 12 with an adhesive or the like, and the outer peripheral surface is bonded to the inner peripheral surface of the tread member 14 with an adhesive or the like. May be fixed. Further, the reinforcing layer 15 may not be provided.
Furthermore, in the said embodiment, although each end part 21a, 22a of both the connection plates 21 and 22 in one connection member 13 was connected to one ring division body 12a, a plurality of rings adjacent to each other in the tire circumferential direction. You may connect across the division body 12a.
Moreover, it replaces with the said embodiment, and each end part 21a, 22a of both the connection plates 21 and 22 may be connected to the inner peripheral surface 12b side of the ring-shaped body 12 by making a tire circumferential direction position mutually differ.

Furthermore, in the said embodiment, each end part 21a, 22a of both the connection plates 21 and 22 is ring-shaped with the bolt 31 inserted from the outer side of the tire radial direction in the insertion hole 33 formed in the ring-shaped body 12. Although connected to the inner peripheral surface 12b side of 12, instead of this, for example, it may be connected to the inner peripheral surface 12b side of the ring-shaped body 12 by bonding or adhesion. Further, a female screw is formed in the ring-shaped body 12 instead of the insertion hole 33, and the bolts 31 are screwed into the female screw from the inner side in the tire radial direction, so that the one end portions 21a, 22a of both the connecting plates 21, 22 are ring-shaped. You may connect to the inner peripheral surface 12b side of the shape body 12. FIG.
Moreover, the insertion hole 33 which does not have the counterbore hole 33a may be employ | adopted, and the volt | bolt 31 may be selected suitably not only in a flat head bolt.

Further, the female screw member 32 is not limited to the above embodiment, and may be appropriately selected, for example, a nut. Further, without providing the female screw member 32, a female screw is formed at each one end portion 21a, 22a of both the connecting plates 21, 22, and a bolt 31 is screwed into this female screw, so that each one end portion 21a, You may connect 22a to the inner peripheral surface 12b side of the ring-shaped body 12. FIG.
Moreover, in the said embodiment, although the internal thread part 11c was formed in the attachment body 11, and the fixing bolt 35 was screwed by this internal thread part 11c, the structure which does not have the internal thread part 11c and the fixing bolt 35 may be employ | adopted.

Moreover, in the said embodiment, although the storage groove 34 was not penetrated ahead in the said cutting direction, you may penetrate. Furthermore, although the storage groove 34 is opened toward the outside in the tire width direction H, it may be closed. The storage groove 34 is not limited to both ends in the tire width direction H as long as it is the outer peripheral surface of the attachment body 11. The formation position may be changed as appropriate.
Furthermore, the ring-shaped body 12 and the elastic member 16 need not be divided into a large number along the tire circumferential direction.
Moreover, in the said embodiment, although the clearance of the tire circumferential direction was provided between the ring division bodies 12a adjacent in the tire circumferential direction, the circumferential edge of the ring division bodies 12a adjacent in the tire circumferential direction is mutually adjacent, or You may contact | abut.
Further, the tread member 14 may not be provided on the outer peripheral surface 12c side of the ring-shaped body 12.
Further, the shape of the connecting member 13 in the side view of the tire may be asymmetric with respect to the virtual line L.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the gist of the present invention, and the above-described modified examples may be appropriately combined.

Next, the verification test about the effect demonstrated above was implemented.
As an example, the non-pneumatic tire 1 shown in FIGS. 1 to 5 is adopted, and as a comparative example, the non-pneumatic tire 1 of the example has a configuration without the elastic member 16, and further as a conventional example. A pneumatic tire with an internal pressure of 230 kPa was used. The tire sizes of these examples, comparative examples, and conventional examples were all 195 / 55R16.

First, using the conventional example as the evaluation criterion (100), the weight, the rolling resistance, the spring constant in the traveling direction, and the spring constant in the braking direction were evaluated by indices for the non-pneumatic tire 1 of the example.
Regarding rolling resistance, the resistance force acting on the drum shaft was measured when each of the tires described above was rotated at a speed of 80 km / h while being pressed onto the drum of the drum tester with a force of 4.0 kN. did.
For each of the spring constants, when the above-described tire is pressed onto the rigid plate with a force of 4.0 kN, the rigid plate is pushed in a direction along the tire circumferential direction out of the directions orthogonal to the pressing direction. And the amount of movement (the amount of deformation of the tire).

The results are shown in Table 1.
In this table, it is shown that the smaller the numerical value, the better the weight and rolling resistance, and the larger the numerical value, the larger the spring constant.

  As a result, in the non-pneumatic tire 1 of the example, it was confirmed that the rolling resistance could be reduced as compared with the conventional pneumatic tire by restricting the deformation amount of the ring-shaped body 12 while suppressing an increase in weight. In addition, it was confirmed that these spring constants can be made equal to each other in the same manner as the conventional pneumatic tire while suppressing the increase of each spring constant.

Next, using the comparative example as an evaluation criterion (100), the contact area, the contact pressure standard deviation, and the maximum stress value applied to both the connecting plates 21 and 22 were evaluated by indices for the non-pneumatic tire 1 of the example.
The ground contact area and the ground pressure standard deviation were obtained by pressing the non-pneumatic tires of the comparative example and the example on the flat plate with a force of 4.0 kN through pressure-sensitive paper to obtain the ground contact shape. Processed and measured.
The maximum stress value was calculated by numerical analysis.
The results are shown in Table 2.
In this table, the larger the numerical value, the larger the contact area, the smaller the numerical value, the better the ground pressure standard deviation, and the smaller the numerical value, the better the maximum stress value.

  As a result, in the non-pneumatic tire 1 of the example, both the ground pressure distribution and the maximum stress value applied to both the connecting plates 21 and 22 are maintained while maintaining the ground contact area equal to that of the non-pneumatic tire of the comparative example. It was confirmed that can be reduced.

  Suppressing the increase in weight, hardness and rolling resistance, ensuring good ride comfort, maneuverability and durability, and equalizing the contact pressure distribution while preventing puncture, and easily Can be assembled.

DESCRIPTION OF SYMBOLS 1 Non-pneumatic tire 11 Attachment body 11c Female thread part 12 Ring-shaped body 12a Ring division body 12b Inner circumferential surface of ring-shaped body 12c Outer circumferential surface of ring-shaped body 13 Connection member 14 Tread member 16 Elastic member 16a Elastic division body 21 1st Connecting plate 22 Second connecting plate 21a, 22a One end 21b, 22b The other end 34 Storage groove 35 Fixing bolt H Tire width direction L Virtual line O Axis line

Claims (7)

An attachment attached to the axle;
A ring-shaped body surrounding the mounting body from the outside in the tire radial direction;
A non-pneumatic tire provided with a plurality of connecting members that are provided along the tire circumferential direction and connect the attachment body and the ring-shaped body,
The connecting member has a first connecting plate that is curved so as to be convex toward one side in the tire circumferential direction and a convex toward the other side in a tire side view when the tire is viewed from the axial direction. A second connecting plate curved to
Each one end part of these both connecting plates is connected to the inner peripheral surface side of the ring-shaped body, and each other end part is connected to the attachment body,
On the outer peripheral surface of the attachment body, a plurality of storage grooves are formed at intervals in the tire circumferential direction,
A non-pneumatic tire characterized in that each other end of each of the connecting plates is connected to the attachment body by being disposed in the storage groove. The non-pneumatic tire according to claim 1,
The attachment body is formed with a female screw portion that opens into the storage groove, and the other end portions of the two connecting plates are fixed by fixing bolts screwed to the female screw portion. Non-pneumatic tire. The non-pneumatic tire according to claim 1 or 2,
Each one end part of the 1st connection plate and the 2nd connection plate in one connection member makes the position of a tire width direction mutually differ in the same position in the tire peripheral direction in the inner peripheral surface side of the above-mentioned ring-shaped object, and is different from each other. Concatenated,
In the connection member, a plurality of the first connection plates are arranged along the tire circumferential direction at one tire width direction position, and a plurality of the second connection plates are arranged along the tire circumferential direction at other tire width direction positions. A non-pneumatic tire characterized in that a plurality of tires are provided along the tire circumferential direction. The non-pneumatic tire according to claim 3,
The storage groove is formed separately at both ends in the tire width direction on the outer peripheral surface of the attachment body, and opens toward the outside in the tire width direction.
The other end of each of the connecting plates is a tire in the mounting body in a state of facing or abutting from the outer side in the tire width direction to the inner wall surface facing the outer side in the tire width direction among the wall surfaces defining the storage groove. A non-pneumatic tire characterized by being separately connected to both ends in the width direction. The non-pneumatic tire according to any one of claims 1 to 4,
The ring-shaped body is divided into a large number of ring divided bodies along the tire circumferential direction, and the ring-shaped body extends along the tire circumferential direction and includes the large number of ring divided bodies. A non-pneumatic tire characterized in that an elastic member connected in the tire circumferential direction is provided. The non-pneumatic tire according to claim 5,
On the outer peripheral surface side of the ring-shaped body, a tread member is disposed over the entire circumference,
A gap in the tire circumferential direction is provided between the ring divided bodies adjacent in the tire circumferential direction, and a portion of the elastic member positioned between the ring divided bodies adjacent in the tire circumferential direction, and the tread member A non-pneumatic tire characterized in that a gap in the tire radial direction is provided between the inner peripheral surface side and the inner peripheral surface side. The non-pneumatic tire according to claim 5 or 6,
The non-pneumatic tire is characterized in that the elastic member is divided into a plurality of elastic divided bodies along a tire circumferential direction.

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