JP5658883B2 - Non pneumatic tire - Google Patents

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. In order to solve such a problem, in recent years, for example, as shown in Patent Document 1 below, an attachment body attached to an axle, a ring-like body surrounding the attachment body from the outside in the tire radial direction, and these A plurality of connecting members disposed along the tire circumferential direction between the attachment body and the ring-shaped body, and the connection member includes a first connection plate for connecting the mounting body and the ring-shaped body; A non-pneumatic tire including a second connecting plate has been proposed.

JP 2009-61861 A

  However, the conventional non-pneumatic tire has room for improvement in terms of weight reduction while suppressing the strength of the connecting member and the reduction of the vertical spring.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a non-pneumatic tire that can be reduced in weight while suppressing the strength of the connecting member and the decrease in the longitudinal spring.

In order to solve the above problems and achieve such an object, the 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 so as to be convex toward one side in the tire circumferential direction, and the second connecting plate curved so as to be convex toward the other side, In each of these connection plates, a hollow hole that penetrates in the tire circumferential direction is formed in an intermediate portion located between one end connected to the ring-shaped body and the other end connected to the attachment body. Formed, the Vent holes in the intermediate portion of each connecting plate, are arranged on the one and the other ends to the connecting portion continuous to each other, the lightening holes, toward the bidirectional tire circumferential direction and the tire width direction Opened and the inner periphery thereof is formed to have an arc shape in a plan view of the connecting plate, and each of the hollowed holes formed in each connecting plate is located between the hollowed holes in the intermediate portion. A direction orthogonal to the tire width direction in the plan view so that the outer edge in the tire width direction of the portion located in the shape of the connecting plate exhibits an arc shape protruding outward in the tire width direction in the plan view It is characterized by being connected to.

In this invention, since the lightening holes are respectively formed in the connecting portions in the intermediate portions of the respective connecting plates, it is possible to reduce the weight of the non-pneumatic tire while suppressing the strength of the connecting members and the reduction of the vertical springs. it can.
That is, the connecting portion is rotated or displaced mainly when a load is applied to the non-pneumatic tire, and is a portion that is difficult to bend and deformed and has a relatively small change in the radius of curvature among the two connecting plates. The load received is small. Therefore, even if a lightening hole is formed in this connection portion, the strength of the connecting member and the decrease in the vertical spring can be suppressed.

Further, the inner peripheral edge of the lightening hole is formed in an arc shape, and the outer edge in the tire width direction of the portion located between the lightening holes in the intermediate portion is convex outward in the tire width direction. Since it is formed in a circular arc shape, it becomes possible to prevent the occurrence of stress concentration places by forming a hollow hole in each connecting plate, and it is possible to reliably suppress a decrease in strength of the connecting member it can.

Further, in the tire side view, the linear distance between the center portion of the lightening hole and the outer end portion of the connection portion in which the lightening hole is formed is the linear length of the intermediate portion. It may be 14% or more and 30% or less.
In this case, the above-described action and effect are surely achieved.
If the linear distance is less than 14% of the linear length, the weight cannot be reduced sufficiently, and if it exceeds 30%, it is difficult to ensure the strength of the connecting member and the vertical spring. Become.

Furthermore, in each of the connecting plates, the size in the tire width direction of the portion where the center portion of the lightening hole is located is 50% or more and 80% or less of the size of the portion having the largest size in the tire width direction. It may be.
In this case, the above-described action and effect are surely achieved.
In each of the connecting plates, when the size in the tire width direction of the portion where the central portion of the lightening hole is located is less than 50% of the size of the portion having the largest size in the tire width direction, It becomes difficult to ensure the strength and the longitudinal spring, and if it exceeds 80%, the weight cannot be reduced sufficiently.

  According to this invention, it is possible to reduce the weight while suppressing the strength of the connecting member and the decrease in the vertical spring.

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. FIG. 3 is a tire side view of a part of the non-pneumatic tire shown in FIGS. 1 and 2 when viewed from the axial direction. FIG. 4 is a schematic view of a part of the non-pneumatic tire shown in FIG. 3 as viewed from the outside in the tire radial direction. FIG. 4 is an enlarged sectional view of a part X of the non-pneumatic tire shown in FIG. 3. It is (a) top view and (b) tire side view which show the 1st connection board and 2nd connection board of the non-pneumatic tire of Drawings 1-5.

Hereinafter, an embodiment of a non-pneumatic tire according to the present invention will be described with reference to FIGS. 1 to 6.
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 disposed along the tire circumferential direction. Between the ring-shaped body 12 and the tread member 14, the connecting member 13 that couples the ring-shaped body 12, the tread member 14 that is disposed on the outer peripheral surface 12 c side of the ring-shaped body 12 over the entire circumference. And a reinforcing layer 15 provided.
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.

  As shown in FIGS. 1 to 3, the attachment body 11 is formed in a cylindrical shape, and on the inside thereof, a rib extending along the tire radial direction and having both ends connected to the inner peripheral surface of the attachment body 11. A plurality of 11a are provided. 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.

As shown in FIGS. 2 and 3, the connecting member 13 is a first curved surface that is curved so as to protrude toward one side in the tire circumferential direction when the tire 1 is viewed from the side of the tire viewed from the direction of the axis O. A connecting plate 21 and a second connecting plate 22 curved so as to be convex toward the other side are provided.
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.

  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 one end portions 21 a and 22 a of the first connecting plate 21 and the second connecting plate 22 are connected to the inner peripheral surface 12 b of the ring-shaped body 12, and the other end portions 21 b and 22 b are connected to the mounting body 11. Yes. Further, in each of the connecting plates 21 and 22, the intermediate portions 21c and 22c located between the one end portions 21a and 22a and the other end portions 21b and 22b are projected in the tire circumferential direction as described above. Is curved. Of these intermediate portions 21c and 22c, one end portion located on the one end portion 21a and 22a side has a larger radius of curvature in the tire side view than the other end portion located on the other end portion 21b and 22b side. And the length is long.

  The one end portions 21a and 22a of the connecting plates 21 and 22 are connected to the intermediate portions 21c and 22c through bent portions, and are opposite to the direction in which the intermediate portions 21c and 22c are curved and convex in the tire circumferential direction. It extends towards the side. The other end portions 21b, 22b of both the connecting plates 21, 22 are smoothly connected to the intermediate portions 21c, 22c and extend in a direction substantially orthogonal to the one end portions 21a, 22a. In addition, the one end portions 21a and 22a and the other end portions 21b and 22b of 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 of the ring-shaped body 12. These one end portions 21a and 22a are connected to the inner peripheral surface 12b of the ring-shaped body 12 separately from each other at different positions in the tire width direction H. In the illustrated example, each of 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 is provided at both end portions in the tire width direction H on the inner peripheral surface 12 b of the ring-shaped body 12. It is connected separately.

  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.

In the present embodiment, as shown in FIGS. 2, 4, and 6, through holes 21 d penetrating in the tire circumferential direction in the intermediate portions 21 c and 22 c of the first connecting plate 21 and the second connecting plate 22, respectively. 21e, 22d, and 22e are formed. The lightening holes 21d, 21e, 22d, and 22e are respectively arranged in connection portions that are respectively connected to the one end portions 21a and 22a and the other end portions 21b and 22b in the intermediate portions 21c and 22c of the connecting plates 21 and 22, respectively. Yes.
In the present embodiment, the lightening holes 21d, 21e, 22d, and 22e open in both directions in the tire circumferential direction and the tire width direction H, and the inner peripheral edges thereof are the first connecting plate 21 and the second connecting plate 22. It is formed so as to exhibit an arc shape in each plan view.

  In the illustrated example, the lightening holes 21d, 21e, 22d, and 22e are formed at outer end portions in the tire width direction H of the first connecting plate 21 and the second connecting plate 22, respectively. In addition, of the respective hollow holes 21d, 21e, 22d, and 22e formed in each of the connecting plates 21 and 22, the thin hole 21d and 22d positioned on the one end 21a and 22a side is the other end 21b and 22b. The curvature radius is small and the length in the direction orthogonal to the tire width direction H is short in the plan view as compared with the lightening holes 21e and 22e located on the side. In addition, the depth toward the inner side of the tire width direction H of the plurality of lightening holes 21d, 21e, 22d, and 22e is equal to each other.

In the present embodiment, each of the hollow holes 21d, 21e, 22d, 22e formed in each of the connecting plates 21, 22 is formed between the hollow holes 21d, 21e, 22d, 22e in the intermediate portions 21c, 22c. The outer edge of the portion located in the tire width direction H is perpendicular to the tire width direction H in the plan view so that the outer edge of the tire width direction H has an arc shape that protrudes outward in the tire width direction H in the plan view. It is lined up in the direction.
In the illustrated example, in each of the connecting plates 21 and 22, the size in the tire width direction H of the portion located between the lightening holes 21d, 21e, 22d, and 22e among the intermediate portions 21c and 22c is as follows. Each of the one end portions 21a and 22a and the other end portions 21b and 22b is equivalent to the size in the tire width direction H. In each of the connecting plates 21 and 22, of the intermediate portions 21 c and 22 c, the portions positioned between the lightening holes 21 d, 21 e, 22 d, and 22 e are the one end side portion and the other end side portion. It matches the boundary part of.

Further, as shown in FIG. 6B, in the tire side view, the center portion of the lightening holes 21d, 21e, 22d, and 22e and the lightening holes 21d, 21e, 22d, and 22e are formed. Linear distances L1 and L2 between the outer ends of the connecting portions are 14% or more and 30% or less of the linear length L0 of the intermediate portions 21c and 22c.
In the illustrated example, in each of the first connecting plate 21 and the second connecting plate 22, the portions where the center portions of the lightening holes 21d, 21e, 22d, and 22e are located are the narrowest.

Further, in the present embodiment, in each of the connecting plates 21 and 22, the widths W1 and W2 of the portions where the center portions of the lightening holes 21d, 21e, 22d and 22e are located are 50% of the width W0 of the widest portion. More than 80%.
In the illustrated example, in each of the connecting plates 21 and 22, the widest portion is the portion of the intermediate portions 21c and 22c that is positioned between the lightening holes 21d, 21e, 22d, and 22e, and the one end portion. 21a, 22a and other end portions 21b, 22b.

Further, as shown in FIG. 3, the shape of each connecting member 13 in the side view of the tire is line-symmetric with respect to a center line L that extends through the tire circumferential direction center portion of the connecting member 13 along the tire radial direction. It has become. The center 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 the angle is 20 ° or more and 90 ° or less, for example, while securing a large number of connecting members 13, the weight of the non-pneumatic tire 1 is reduced, or both connecting plates adjacent in the tire circumferential direction are used. 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 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.
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 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 bolt 31 is a countersunk head having a head portion 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.

Further, 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 substantially coincides with the direction in which the other end portions 21b and 22b of the connecting plates 21 and 22 extend in the tire side view among the directions inclined with respect to the tire radial direction. 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.

  Further, in the present embodiment, as shown in FIG. 3, the mounting body 11 is formed with an internal thread portion 11 c that opens into the storage groove 34, and the other end portions 21 b and 22 b of both the connecting plates 21 and 22 The fixing bolt 35 screwed to the female screw portion 11c 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 hollow holes 21d, 21e, 22d, and 22e are formed in the intermediate portions 21c and 22c of the first connecting plate 21 and the second connecting plate 22, respectively. Since it forms in the said connection part separately, the weight reduction of the non-pneumatic tire 1 can be achieved, suppressing the fall of the intensity | strength of the connection member 13, or a vertical spring.
That is, the connecting portion is mainly rotated or displaced when a load is applied to the non-pneumatic tire 1, and the bending radius is difficult to be deformed in each of the connecting plates 21 and 22. It is a relatively small part and receives a small load. Therefore, even if the hollow holes 21d, 21e, 22d, and 22e are formed in this connection portion, the strength of the connecting member 13 and the decrease in the vertical spring can be suppressed.

  Further, the tire widths of the portions where the inner peripheral edges of the lightening holes 21d, 21e, 22d, 22e are formed in an arc shape and are located between the lightening holes 21d, 21e, 22d, 22e in the intermediate portions 21c, 22c. Since the outer edge in the direction H is formed in an arc shape that protrudes outward in the tire width direction H, the hollow holes 21d, 21e, 22d, and 22e are formed in the connecting plates 21 and 22, respectively. It is possible to prevent the occurrence of a stress concentration location, and it is possible to reliably suppress a decrease in strength of the connecting member 13.

  Further, in the tire side view, between the central portion of the lightening holes 21d, 21e, 22d, and 22e and the outer end portion of the connection portion in which the lightening holes 21d, 21e, 22d, and 22e are formed. The linear distances L1 and L2 of the intermediate portions 21c and 22c are set to be 14% or more and 30% or less of the linear length L0 of the intermediate portions 21c and 22c. Since the widths W1 and W2 of the portion where the central portion is located are not less than 50% and not more than 80% of the width W0 of the widest portion, the above-described operational effects are surely achieved.

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, 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 cut from the outer peripheral surface of the attachment body 11 toward the inside along the direction in which the other end portions 21b, 22b of the connecting plates 21, 22 extend in the tire side view. The other end portions 21b and 22b of 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. 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 and 22, and the above-described effects can be reliably achieved, and the tread member 14 and the reinforcing layer 15 are provided on the outer peripheral surface 12 c side of the ring-shaped body 12. 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, it is possible to easily connect and release the one end portions 21a, 22a of both the connecting plates 21, 22 and the inner peripheral surface 12b of the ring-shaped body 12. 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 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 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.

  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, the form of the lightening holes 21d, 21e, 22d, and 22e is not limited to the above embodiment, and may be changed as appropriate.
For example, although the structure which opened not only in the tire circumferential direction but also in the tire width direction H is shown as the lightening holes 21d, 21e, 22d, and 22e, it may be opened only in the tire circumferential direction. Furthermore, as the hollow holes 21d, 21e, 22d, and 22e, the inner peripheral edge has a circular arc shape in the plan view, but instead, for example, a polygonal shape, a waveform, or the like is adopted. Also good. Moreover, in the said embodiment, although the hollow holes 21d, 21e, 22d, and 22e were formed in the outer end part of the tire width direction H in each of the 1st connection plate 21 and the 2nd connection plate 22, You may form in an inner edge part and may form in the both ends of the tire width direction H.

Moreover, it replaces with the elastic member 16 shown in the said embodiment, for example, is formed with steel etc., and is extended along the tire circumferential direction with the bundle wire, the single wire or the stranded wire 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 the said 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.
Further, instead of the above-described embodiment, the one end portions 21a and 22a of both the connecting plates 21 and 22 may be connected to the inner peripheral surface 12b of the ring-shaped body 12 at different positions in the tire circumferential direction.

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 it connected with 12 inner peripheral surfaces 12b, it may replace with this and may connect with the inner peripheral surface 12b of the ring-shaped body 12, for example by joining or adhesion | attachment. 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 with the internal peripheral surface 12b of the shape-like 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 internal peripheral surface 12b 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.

Furthermore, in the above-described embodiment, the storage groove 34 is formed on the outer peripheral surface of the mounting body 11. However, without forming the storage groove 34, the other end portions 21 b and 22 b of both the connecting plates 21 and 22 are joined, for example, You may connect with the outer peripheral surface of the attachment body 11 by adhesion | attachment etc.
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.

  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 spirit 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.
The non-pneumatic tire 1 shown in FIGS. 1 to 6 is adopted as an example, and as a comparative example, in the non-pneumatic tire 1, a plurality of lightening holes 21 d, 21 e, 22 d are used instead of the connecting member 13. The structure which has the connection member which does not have 22e was employ | adopted. The tire sizes of these examples and comparative examples were both 145 / 80R13.

Then, using the comparative example as the evaluation criterion (100), the weight, the strength of the connecting member, and the vertical spring were evaluated by indices for the non-pneumatic tire 1 of the example.
The strength of the connecting member was evaluated based on the maximum value of stress applied to the first connecting plate and the second connecting plate, and for the vertical spring, the non-pneumatic tire was pushed with a predetermined force from the outside in the tire radial direction. The time force and the amount of deformation were measured and evaluated.

  The results are shown in Table 1.

  As a result, in the non-pneumatic tire 1 of the example, it was confirmed that the weight could be reduced while suppressing the strength of the connecting member and the decrease in the vertical spring.

  It is possible to reduce the weight while suppressing the strength of the connecting member and the decrease in the vertical spring.

DESCRIPTION OF SYMBOLS 1 Non-pneumatic tire 11 Attachment body 12 Ring-shaped body 13 Connection member 21 1st connection board 22 2nd connection board 21a, 22a One end part 21b, 22b Other end part 21c, 22c Intermediate part 21d, 21e, 22d, 22e Meat extraction Hole H Tire width direction O Axis

Claims (3)

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
In each of these connection plates, a hollow hole that penetrates in the tire circumferential direction is formed in an intermediate portion located between one end connected to the ring-shaped body and the other end connected to the attachment body. Formed,
In the intermediate portion of each connecting plate, the lightening holes are respectively disposed in connection portions that are continuously connected to the one end portion and the other end portion, respectively .
The lightening hole is formed to open in both directions of the tire circumferential direction and the tire width direction, and the inner peripheral edge thereof is formed in an arc shape in a plan view of the connection plate,
Each hollow hole formed in each connecting plate has an outer edge in a tire width direction of a portion located between these hollow holes in the intermediate portion, in the tire width direction in a plan view of the connecting plate. A non-pneumatic tire characterized by being connected in a direction orthogonal to the tire width direction in the plan view so as to exhibit an arc shape that is convex toward the outside of the tire. The non-pneumatic tire according to claim 1 ,
In the tire side view, the linear distance between the central portion of the lightening hole and the outer end portion of the connection portion where the lightening hole is formed is 14% of the linear length of the intermediate portion. A non-pneumatic tire characterized by being 30% or less. The non-pneumatic tire according to claim 1 or 2 ,
In each of the connecting plates, the size in the tire width direction of the portion where the center portion of the lightening hole is located is 50% to 80% of the size of the portion having the largest size in the tire width direction. A non-pneumatic tire characterized by

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