JP2012011971A - Non-pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability as well as to suppress increase in rolling resistance, in a non-pneumatic tire.SOLUTION: The non-pneumatic tire includes: a mounting body to be mounted on an axle; a ring-shaped body 12 surrounding the mounting body from the outside in a tire radial direction; a plurality of connecting members provided along a tire circumferential direction and connecting the mounting body and the ring-shaped body 12; and a tread member 14 disposed over the whole circumference in an outer circumferential face side of the ring-shaped body 12. The ring-shaped body 12 is divided into a great number of ring division bodies 12a along the tire circumferential direction, and a clearance in the tire circumferential direction is provided between ring division bodies 12a adjacent to each other in the tire circumferential direction. In each of the ring division bodies 12a, in an outer circumferential edge portion 17a on a surface 17 side constituting the outer circumferential surface side of the ring-shaped body 12, a circumferential end 17b located at an end in the tire circumferential direction has a chamfered portion 18 formed.

Description

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

  Conventionally, as this type of non-pneumatic tire, for example, as shown in Patent Document 1 below, a mounting body attached to an axle, a ring-shaped body surrounding the mounting body from the outside in the tire radial direction, and a tire circumference There is known a structure provided with a plurality of connecting members that are provided along the direction and connect the attachment body and the ring-shaped body, and a tread member that is disposed on the outer peripheral surface side of the ring-shaped body over the entire circumference. Yes. In this tire, the ring-shaped body is divided into a large number of ring divided bodies along the tire circumferential direction, and a gap in the tire circumferential direction is provided between ring divided bodies adjacent in the tire circumferential direction. .

JP 2010-36885 A

  However, in the conventional non-pneumatic tire, when an external force such as the weight of the vehicle body is input and the tread member is deformed toward the inner side in the tire radial direction, the tread member is formed between the ring divided bodies. The tread member has a circumferential end located at the end in the tire circumferential direction, out of the outer peripheral edge on the surface side constituting the outer peripheral surface side of the ring-shaped body in the ring divided body. There is a risk that the inner peripheral surface side of the tread member may be shaved. As a result, energy loss occurs, and there is a problem that rolling resistance increases.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the non-pneumatic tire which can suppress the increase in rolling resistance while improving durability.

In order to solve the above problems, the present invention proposes the following means.
The non-pneumatic tire according to the present invention includes a mounting body attached to an axle, a ring-shaped body surrounding the mounting body from the outside in the tire radial direction, and a plurality of the mounting body and the ring provided along a tire circumferential direction. And a tread member disposed on the outer peripheral surface side of the ring-shaped body over the entire circumference thereof. The ring-shaped body includes a plurality of ring-shaped bodies along the tire circumferential direction. A non-pneumatic tire that is divided into ring divided bodies and in which a gap in the tire circumferential direction is provided between adjacent ring divided bodies in the tire circumferential direction, and an outer periphery of the ring-shaped body in the ring divided body A chamfered portion is formed at a peripheral end portion located at an end portion in the tire circumferential direction among the outer peripheral edge portions on the front surface side constituting the surface side.

  According to this invention, since the chamfered portion is formed at the peripheral end portion of the ring divided body, for example, when an external force such as the weight of the vehicle body is input and the tread member is deformed toward the inner side in the tire radial direction. The peripheral edge of the ring segment is in contact with the tread member with a surface instead of a corner. As a result, the tread member can be prevented from being deformed toward the inner side in the tire radial direction, and the inner peripheral surface side of the tread member can be prevented from being scraped by the ring divided body, thereby improving the durability of the non-pneumatic tire. Can be improved. Moreover, it can suppress that energy loss arises and can suppress the increase in rolling resistance.

  The size of the chamfered portion along the tire radial direction may be equal to or smaller than the size of the chamfered portion along the tire circumferential direction.

  In this case, since the size of the chamfered portion along the tire radial direction is equal to or smaller than the size of the chamfered portion along the tire circumferential direction, the non-pneumatic tire rolls and steps on or kicks the road surface. When the tread member is taken out, the tread member can be easily brought into contact with the chamfered portion of the ring divided body, and deformation of the tread member in the tire radial direction can be reliably suppressed by the chamfered portion.

  When the size of the chamfered portion along the tire radial direction is not more than the size of the chamfered portion along the tire circumferential direction and the chamfered portion is formed in a flat shape, Since the chamfering angle of the chamfered portion with respect to the surface of the divided body is 45 degrees or less, the above-described effects can be reliably achieved. That is, when the chamfering angle is larger than 45 degrees, the angle formed between the surface of the ring divided body and the chamfered portion is small, and these intersecting portions are likely to have sharp angles, and the inner peripheral surface side of the tread member is cut by the intersecting portions. There is a risk of being.

  Further, the chamfered portion may be formed in a convex curved shape.

In this case, since the chamfered portion is formed in a convex curved surface shape, the inner peripheral surface side of the tread member can be reliably suppressed from being scraped.
When the connecting portion connected to the surface of the ring divided body in the chamfered portion is formed to have a curvature with the surface of the ring divided body as a tangent in the tire side view when the tire is viewed from the outside in the tire width direction. Further, it becomes possible to smoothly connect the chamfered portion and the surface of the ring divided body, and it is possible to more reliably suppress the inner peripheral surface side of the tread member from being scraped.

  Further, the ring divided body is formed in a plate shape whose front and back surfaces extend in the ring circumferential direction, and the size along the tire circumferential direction of the chamfered portion is a plate width along the tire circumferential direction of the ring divided body. It may be 1/20 times or more and 1/4 times or less.

In this case, since the size of the chamfered portion along the tire circumferential direction is 1/20 times or more and 1/4 times or less the plate width of the ring divided body, the above-described effects can be reliably achieved.
That is, when the size of the chamfered portion along the tire circumferential direction is smaller than 1/20 times the plate width of the ring divided body, the chamfered portion is too small, and the above-described effects may not be achieved. On the other hand, when the size along the tire circumferential direction of the chamfered portion is larger than 1/4 times the plate width of the ring divided body, the size along the tire circumferential direction of the surface of the ring divided body becomes small. The interval along the tire circumferential direction between the surfaces of the ring divided bodies adjacent in the tire circumferential direction becomes too large. As a result, variations in the contact pressure within the contact surface are likely to occur, and uneven wear may occur in the tread member.

  The chamfered portion may be formed in a flat shape, and the chamfered angle of the chamfered portion with respect to the surface of the ring divided body may be 5 degrees or more.

  In this case, since the chamfer angle is 5 degrees or more, the inner peripheral surface side of the tread member can be reliably suppressed from being scraped. That is, when the chamfer angle is smaller than 5 degrees, the size of the chamfered portion along the tire radial direction is small, so that the inner peripheral surface side of the tread member faces the tire circumferential direction in the chamfered portion and the ring divided body. It is easy to come into contact with the intersecting portion of the tread member, and the inner peripheral surface side of the tread member may be scraped by the intersecting portion.

  Further, the ring divided body is formed in a plate shape whose front and back surfaces extend in the ring circumferential direction, and the size along the tire circumferential direction of the chamfered portion is a plate width along the tire circumferential direction of the ring divided body. It may be 1/20 times or more and 1/5 times or less.

In this case, since the size of the chamfered portion along the tire circumferential direction is 1/20 times or more and 1/5 times or less the plate width of the ring divided body, the above-described effects can be reliably achieved.
That is, when the size of the chamfered portion along the tire circumferential direction is smaller than 1/20 times the plate width of the ring divided body, the chamfered portion is too small, and the above-described effects may not be achieved. On the other hand, when the size along the tire circumferential direction of the chamfered portion is larger than 1/5 times the plate width of the ring divided body, the size along the tire circumferential direction of the surface of the ring divided body becomes small. The interval along the tire circumferential direction between the surfaces of the ring divided bodies adjacent in the tire circumferential direction becomes too large. As a result, variations in the contact pressure within the contact surface are likely to occur, and uneven wear may occur in the tread member.

  The non-pneumatic tire according to the present invention can improve durability and suppress an increase in rolling resistance.

In 1st 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. It is a partial expanded sectional view of the non-pneumatic tire in 2nd Embodiment concerning this invention.

(First embodiment)
Hereinafter, a first 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 for connecting the outer peripheral surface side and the inner peripheral surface 12b side of the ring-shaped body 12 and a tread member 14 disposed on the outer peripheral surface 12c side of the ring-shaped body 12 over the entire periphery thereof are provided. Yes.
Each of the attachment body 11, the ring-shaped body 12, and the tread member 14 is formed to have the same size in the tire width direction H, and the central portion in the tire width direction H is coaxial with the axis O. They are arranged to match.

  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. In the illustrated example, the tread member 14 has a laminated structure in which a cylindrical tread body 14a and a reinforcing layer 14b disposed between the ring-shaped body 12 and the tread body 14a are arranged coaxially. ing.
The tread body 14a is made of, for example, a vulcanized rubber obtained by vulcanizing at least one of natural rubber and 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. From the viewpoint of wear resistance, it is preferable to form the tread body 14a from vulcanized rubber.
The reinforcing layer 14b 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 14b is in close contact with the inner peripheral surface of the tread body 14a and the outer peripheral surface 12c of the ring-shaped body 12 by elastic restoring forces of both connecting plates 21 and 22, which will be described later. The reinforcing layer 14b may be formed integrally with the tread body 14a.

  The connecting member 13 includes a first connecting plate 21 that is curved so as to protrude toward one side in the tire circumferential direction when viewed from the outside in the tire width direction H, and the other side toward the other side. And a second connecting plate 22 curved so as to be convex. 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 separated from each end 21a, 22a in the tire radial direction by a same angle (for example, 20 degrees or more and 135 degrees or less) on one side and the other side in the tire circumferential direction around the axis O. It is connected separately. If this angle is set to 20 degrees or more and 90 degrees 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 has a plate shape whose front and back surfaces extend in the tire circumferential direction. In the illustrated example, the front and back surfaces of the ring divided body 12a extend along both the tire circumferential direction and the tire width direction H. Yes. Further, the ring divided body 12a is formed of a metal material, and its size in the tire radial direction, that is, the thickness thereof 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.

The one end portions 21a and 22a of the connecting plates 21 and 22 are respectively connected to the inner peripheral surface 12b side of the ring-shaped body 12 by bolts 31 inserted into the insertion holes 33 formed in the ring-shaped body 12 from the outer side in the tire radial direction. It is connected to.
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 vulcanized rubber obtained by vulcanizing at least one of natural rubber and a rubber composition, a metal material, a thermoplastic material, or the like. 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 12a adjacent in the tire circumferential direction and the inner circumferential surface of the tread member 14.

  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, the chamfered portion of the peripheral edge portion 17b located at the end portion in the tire circumferential direction among the outer peripheral edge portions 17a on the surface 17 side constituting the outer peripheral surface 12c side of the ring-shaped body 12 in the ring divided body 12a. 18 is formed. In the illustrated example, the chamfered portion 18 is formed in both the portion located on the one side in the tire circumferential direction and the portion located on the other side in the tire circumferential direction in the circumferential end portion 17b. Further, the chamfered portion 18 extends in the tire width direction H at the peripheral end portion 17b, and is formed over the entire length in the tire width direction H of the peripheral end portion 17b.

The size L1 of the chamfered portion 18 along the tire radial direction is equal to or smaller than the size L2 of the chamfered portion 18 along the tire circumferential direction. In the illustrated example, the chamfered portion 18 is formed in a flat shape, and is a straight line connected to the surface 17 of the ring divided body 12a in the tire side view, and the chamfered portion with respect to the surface 17 of the ring divided body 12a. The chamfer angle θ of 18 is 45 degrees or less. Further, in the illustrated example, the chamfer angle θ is 5 degrees or more. Further, the chamfered portion 18 connects the surface 17 of the ring divided body 12a and the peripheral end surface of the ring divided body 12a facing the tire circumferential direction.
The size L2 along the tire circumferential direction of the chamfered portion 18 is not less than 1/20 times and not more than 1/5 times the plate width L3 along the tire circumferential direction of the ring divided body 12a.

Here, 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 21 b and 22 b of both the connecting plates 21 and 22 are formed in the storage groove 34. It is connected with the attachment body 11 by arrange | positioning.
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, since the chamfered portion 18 is formed at the peripheral end portion 17b of the ring divided body 12a, an external force such as the weight of the vehicle body is input. When the tread member 14 is deformed toward the inner side in the tire radial direction, the peripheral end portion 17b of the ring divided body 12a comes into contact with the tread member 14 at a surface instead of a corner. Thereby, while being able to suppress that the tread member 14 deform | transforms toward the inner side of a tire radial direction, it suppresses that the inner peripheral surface side of the tread member 14 is scraped off by the ring division body 12a, and this non-pneumatic tire 1 durability can be improved. Moreover, it can suppress that energy loss arises and can suppress the increase in rolling resistance.

  In addition, since the size L1 along the tire radial direction of the chamfered portion 18 is equal to or less than the size L2 along the tire circumferential direction of the chamfered portion 18, the non-pneumatic tire 1 rolls to the road surface. When treading or kicking out the tread member 14, the tread member 14 can be easily brought into contact with the chamfered portion 18 of the ring divided body 12a, and the chamfered portion 18 ensures deformation of the tread member 14 in the tire radial direction. Can be suppressed. When the non-pneumatic tire 1 steps on or kicks off the road surface, an angle formed by the road surface side portion of the tread member 14 with respect to the road surface is, for example, about 2 to 15 degrees.

  Further, since the chamfering angle θ is 5 degrees or more and 45 degrees or less, it is possible to surely prevent the inner peripheral surface side of the tread member 14 from being scraped. That is, when the chamfering angle θ is smaller than 5 degrees, the size L1 along the tire radial direction of the chamfered portion 18 is small, so that the inner peripheral surface side of the tread member 14 is located around the chamfered portion 18 and the ring divided body 12a. It is easy to contact the intersection with the end surface, and the inner circumferential surface side of the tread member 14 may be scraped by the intersection. On the other hand, when the chamfering angle θ is larger than 45 degrees, the angle formed by the chamfered portion 18 and the surface 17 of the ring divided body 12a is small, and the intersection of these surfaces tends to be a sharp angle. There is a possibility that the inner peripheral surface side of the tread member 14 may be cut.

Moreover, since the size L2 along the tire circumferential direction of the chamfered portion 18 is 1/20 times or more and 1/5 times or less of the plate width L3 of the ring divided body 12a, the above-described effects can be reliably achieved. Can do.
That is, when the size L2 along the tire circumferential direction of the chamfered portion 18 is smaller than 1/20 times the plate width L3 of the ring divided body 12a, the chamfered portion 18 is too small, and the above-described effects may not be achieved. There is. On the other hand, when the size L2 along the tire circumferential direction of the chamfered portion 18 is larger than 1/5 times the plate width L3 of the ring divided body 12a, the size along the tire circumferential direction of the surface 17 of the ring divided body 12a. Therefore, the distance along the tire circumferential direction between the surfaces 17 of the ring divided bodies 12a adjacent in the tire circumferential direction becomes too large. As a result, variations in the contact pressure within the contact surface are likely to occur, and the tread member 14 may be unevenly worn.

  In the present embodiment, 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 tread member 14. As a result, the load received from the road surface can be reliably transmitted to both the connecting plates 21 and 22, and the tread member 14 can be easily mounted on the outer peripheral surface 12 c side of the ring-shaped body 12.

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 portion of the bolt 31 is accommodated in the counterbore hole 33a of the insertion hole 33, it is possible to prevent the head portion of the bolt 31 from protruding from the outer peripheral surface 12c of the ring-shaped body 12. Interference between the head of the bolt 31 and the inner peripheral surface of the tread member 14 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.

  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 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.

In the present embodiment, the size L2 of the chamfered portion 18 along the tire circumferential direction is 1/20 times to 1/5 times the plate width L3 of the ring divided body 12a. I can't.
Moreover, although the chamfering angle θ of the chamfered portion 18 with respect to the surface 17 of the ring divided body 12a is 5 degrees or more, it is not limited to this.

(Second Embodiment)
Next, a non-pneumatic tire according to a second embodiment of the present invention will be described.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

As shown in FIG. 6, in the non-pneumatic tire 40 of the present embodiment, the chamfered portion 18 is formed in a convex curved shape. In the illustrated example, the ring divided body 12 a is viewed from the side of the tire. While being connected to the surface 17, it is formed in the convex curve shape which protrudes toward the outer side of a tire radial direction. And the connection part 19 with the surface 17 of the ring division body 12a in the chamfering part 18 is formed in the curvature which makes the surface 17 of the ring division body 12a tangent in the said tire side view.
In the illustrated example, the size L2 along the tire circumferential direction of the chamfered portion 18 is not less than 1/20 times and not more than 1/4 times the plate width L3 of the ring divided body 12a.

As described above, according to the non-pneumatic tire 40 according to the present embodiment, since the chamfered portion 18 is formed in a convex curved shape, the inner peripheral surface side of the tread member 14 is reliably suppressed from being scraped. Can do.
Further, as in the present embodiment, the connecting portion 19 of the chamfered portion 18 with the surface 17 of the ring divided body 12a is formed with a curvature tangent to the surface 17 of the ring divided body 12a in the tire side view. The chamfered portion 18 and the surface 17 of the ring divided body 12a can be smoothly connected, and the inner peripheral surface side of the tread member 14 can be more reliably prevented from being scraped.

Moreover, since the size L2 along the tire circumferential direction of the chamfered portion 18 is not less than 1/20 times and not more than 1/4 times the plate width L3 of the ring divided body 12a, the above-described effects can be reliably achieved. Can do.
That is, when the size L2 along the tire circumferential direction of the chamfered portion 18 is smaller than 1/20 times the plate width L3 of the ring divided body 12a, the chamfered portion 18 is too small, and the above-described effects may not be achieved. There is. On the other hand, when the size L2 along the tire circumferential direction of the chamfered portion 18 is larger than 1/4 times the plate width L3 of the ring divided body 12a, the size along the tire circumferential direction of the surface 17 of the ring divided body 12a. Therefore, the distance along the tire circumferential direction between the surfaces 17 of the ring divided bodies 12a adjacent in the tire circumferential direction becomes too large. As a result, variations in the contact pressure within the contact surface are likely to occur, and the tread member 14 may be unevenly worn.

In the present embodiment, the size L2 of the chamfered portion 18 along the tire circumferential direction is 1/20 times to 1/4 times the plate width L3 of the ring divided body 12a. I can't.
Further, the connecting portion 19 of the chamfered portion 18 with the surface 17 of the ring divided body 12a is formed to have a curvature with the surface 17 of the ring divided body 12a as a tangent in the tire side view. Not limited.

  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, in the center portion in the tire width direction H.
Further, the elastic member 16 may be continuously extended over the entire circumference along the tire circumferential direction, and may not be divided into a large number along the tire circumferential direction.

  Furthermore, in place of the embodiment, the reinforcing layer 14b 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 body 14a with an adhesive or the like. May be fixed. Further, the reinforcing layer 14b may not be provided.

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.
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.
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.
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.

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 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.

Moreover, in the said embodiment, although the magnitude | size L1 along the tire radial direction of the chamfering part 18 shall be below the magnitude | size L2 along the tire circumferential direction of this chamfering part 18, it is not restricted to this.
Moreover, in the said embodiment, the chamfering part 18 is both the part located in the said one side of the tire circumferential direction among the said circumferential end parts 17b of the ring division body 12a, and the part located in the said other side of a tire circumferential direction. In addition, although formed over the entire length in each tire width direction H, the present invention is not limited to this. For example, the chamfered portion 18 may not be formed over the entire length in the tire width direction H of the peripheral end portion 17b. Further, the chamfered portion 18 may be formed in at least one of a portion located on the one side in the tire circumferential direction and a portion located on the other side in the tire circumferential direction in the circumferential end portion 17b.

  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.
As an example, the non-pneumatic tire 1 of the first embodiment shown in FIG. 1 to FIG. 5 was adopted, and as a comparative example, a configuration without a chamfered portion was adopted in the non-pneumatic tire 1 of the example. . The tire sizes of these examples and comparative examples were both 145 / 80R13.

And the durability and rolling resistance were evaluated by the index | exponent about the non-pneumatic tire 1 of the Example as an evaluation reference | standard (100).
In these evaluations, each of the tires described above was rotated in a state of being pressed with a force of 2.5 kN onto the drum of the drum tester.

The results are shown in Table 1.
In this table, the larger the numerical value, the better the durability, and the smaller the numerical value, the better the rolling resistance.

  As a result, it was confirmed that the non-pneumatic tire 1 of the example can improve durability and suppress an increase in rolling resistance as compared with the non-pneumatic tire of the comparative example.

DESCRIPTION OF SYMBOLS 1, 40 Non-pneumatic tire 11 Attachment body 12 Ring-shaped body 12a Ring division body 12c Outer peripheral surface of ring-shaped body 13 Connecting member 14 Tread member 17 Surface 17a Outer peripheral edge portion 17b Circumferential end portion 18 Chamfered portion H Tire width direction

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 plurality of connecting members provided along the tire circumferential direction for connecting the attachment body and the ring-shaped body;
A tread member disposed on the outer peripheral surface side of the ring-shaped body over the entire circumference thereof, and
The ring-shaped body is divided into a plurality of ring divided bodies along the tire circumferential direction, and a non-pneumatic tire in which a gap in the tire circumferential direction is provided between ring divided bodies adjacent in the tire circumferential direction Because
In the ring divided body, a chamfered portion is formed at a peripheral end portion located at an end portion in the tire circumferential direction among the outer peripheral edge portions on the surface side constituting the outer peripheral surface side of the ring-shaped body. Non-pneumatic tire. The non-pneumatic tire according to claim 1,
The size of the chamfered portion along the tire radial direction is equal to or smaller than the size of the chamfered portion along the tire circumferential direction. The non-pneumatic tire according to claim 1 or 2,
The non-pneumatic tire characterized in that the chamfered portion is formed in a convex curved shape.

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