WO2020121937A1

WO2020121937A1 - Non-pneumatic tire

Info

Publication number: WO2020121937A1
Application number: PCT/JP2019/047604
Authority: WO
Inventors: 成志西田
Original assignee: 株式会社ブリヂストン
Priority date: 2018-12-14
Filing date: 2019-12-05
Publication date: 2020-06-18
Also published as: JP2020093722A

Abstract

This non-pneumatic tire comprises: an inner cylinder (12) centered around the axis of an axle; an outer cylinder (13) that surrounds the inner cylinder (12) from the outside in the tire radial direction; an elastically deformable connecting member (15) that connects the outer peripheral surface of the inner cylinder (12) and the inner peripheral surface of the outer cylinder (13); and a tread member (16) that is mounted to the outer cylinder (13). The tread member (16) has a tread body (16a) that covers the outer cylinder (13) from the outside in the tire radial direction and a tread ear (16b) that is connected to the tread body (16a) in the tire width direction (H) and located further outward than the outer cylinder (13) in the tire width direction (H). The tread ear (16b) has a cover portion (16d) disposed so as to overlap with the outer cylinder (13) when viewed from the tire width direction (H). The dimensions (W) of the tread ear (16b) in the tire width direction (H) is smaller than the dimensions (L1) of the tread ear (16b) in the tire radial direction.

Description

Non-pneumatic tire

The present invention relates to a non-pneumatic tire.
The present application claims priority based on Japanese Patent Application No. 2018-234071 filed in Japan on December 14, 2018, the contents of which are incorporated herein by reference.

Conventionally, non-pneumatic tires such as the airless tire described in Patent Document 1 are known.
The non-pneumatic tire has an inner cylinder centered on the axis of the axle, an outer cylinder enclosing the inner cylinder from the outside in the tire radial direction, an outer peripheral surface of the inner cylinder and an inner peripheral surface of the outer cylinder. A connecting member that is connected and elastically deformable, and a tread member that is attached to the outer cylindrical body are provided.

Japanese Patent No. 6291489

As shown in FIG. 8 and FIG. 9, when the tread member 116 has an end portion 116a protruding outward in the tire width direction H with respect to the outer cylinder body 113, the non-pneumatic tire 100 is attached to the curb CS of the road surface R or the like. When they come into contact with or ride on top of each other, the end portion 116a may be cracked and damaged. Such breakage of the end portion 116a is called "cutting of the ears" or the like.

In view of the above circumstances, an object of the present invention is to provide a non-pneumatic tire capable of suppressing damage to the tread member while protecting the outer cylinder with the tread member.

A non-pneumatic tire according to a first aspect of the present invention includes an inner cylinder centered on an axis of an axle, an outer cylinder surrounding the inner cylinder from the outside in the tire radial direction, and an outer circumference of the inner cylinder. A connecting member that connects the surface and the inner peripheral surface of the outer cylinder body and is elastically deformable; and a tread member that is mounted on the outer cylinder body, wherein the tread member is a tire radial direction of the outer cylinder body. Of the tread main body, which is connected to the tread main body in the tire width direction from the outside, and has a tread ear portion located outside of the outer tubular body in the tire width direction, and the tread ear portion is a tire. When viewed from the width direction, the tire has a cover portion that is arranged so as to overlap with the outer cylindrical body, and the dimension of the tread ear portion in the tire width direction is smaller than the dimension of the tread ear portion in the tire radial direction.

According to the non-pneumatic tire of the present invention, damage to the tread member can be suppressed while protecting the outer cylinder with the tread member.

It is a side view which shows the non-pneumatic tire of 1st Embodiment of this invention. It is the side view which looked at some inner cylinders of a non-pneumatic tire, a connecting member, and an outer cylinder from the tire width direction. It is sectional drawing which follows a tire width direction which shows some non-pneumatic tires of 1st Embodiment. It is a figure which expands and shows a part of FIG. It is sectional drawing which follows a tire width direction which shows some non-pneumatic tires of the modification of 1st Embodiment. It is a figure which expands and shows a part of FIG. It is sectional drawing which follows a tire width direction which shows some non-pneumatic tires of 2nd Embodiment of this invention. FIG. 3 is a perspective view showing a situation in which a non-pneumatic tire rolling on a road surface comes into contact with or rides on a curbstone or the like. It is a sectional view which shows a part of non-pneumatic tire of a reference example along with the tire width direction.

<First Embodiment>
Hereinafter, the non-pneumatic tire 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6.
As shown in FIGS. 1 to 4, the non-pneumatic tire 1 according to the present embodiment has a mounting body 11 mounted on an axle (not shown), an inner cylinder body 12 centered on an axis O of the axle body, and an inner cylinder body 12. Is attached to the outer cylinder body 13, an outer cylinder body 13 that surrounds the tire from the outside in the tire radial direction, a connecting member 15 that connects the outer peripheral surface of the inner cylinder body 12 and the inner peripheral surface of the outer cylinder body 13 and is elastically deformable. And a tread member 16.

The non-pneumatic tire 1 of the present embodiment may be adopted in a two-wheeled vehicle such as a bicycle, and may be driven with a camber angle of about 30 degrees. For example, a handle type electric motor defined in JIS T 9208 It may be used in small vehicles such as wheelchairs that run at low speed. Further, the non-pneumatic tire 1 may be adopted in vehicles such as passenger cars.

The mounting body 11, the inner cylindrical body 12, the outer cylindrical body 13, and the tread member 16 are coaxially arranged with the axis O as a common axis.
In the present embodiment, the direction along the axis O (the direction in which the axis O extends) is called the tire width direction H.
In the tire width direction H, the direction from both ends in the tire width direction H of the non-pneumatic tire 1 toward the center C is called the inside of the tire width direction H, and from the center C of the non-pneumatic tire 1 in the tire width direction H. The direction toward both ends is called the outside in the tire width direction H. The center C may be rephrased as a center plane C that passes through the center of the non-pneumatic tire 1 in the tire width direction H and is perpendicular to the axis O.
Of the both ends (the first end and the second end) of the non-pneumatic tire 1 in the tire width direction H, the direction from the first end to the second end is one side of the tire width direction H. The direction from the second end to the first end is referred to as the other side in the tire width direction H. In the example of the present embodiment, in FIG. 3, one side in the tire width direction H is the right side and the other side in the tire width direction H is the left side.

The direction orthogonal to the axis O is called the tire radial direction. Of the tire radial direction, the direction approaching the axis O is called the inside of the tire radial direction, and the direction away from the axis O is called the outside of the tire radial direction.
The direction of rotation around the axis O is called the tire circumferential direction. Of the tire circumferential direction, a predetermined rotation direction along the axis O is referred to as one side of the tire circumferential direction, and the opposite rotation direction is referred to as the other side of the tire circumferential direction. In the example of the present embodiment, in FIGS. 1 and 2, one side in the tire circumferential direction is clockwise about the axis O, and the other side in the tire circumferential direction is counterclockwise about the axis O. Is.

The mounting body 11 is made of metal. The mounting body 11 may be referred to as a wheel. The mounting body 11 can be mounted on an axle.
The mounting body 11 connects the mounting tubular portion 17 to which the tip portion of the axle is mounted, the outer ring portion 18 that surrounds the mounting tubular portion 17 from the outside in the tire radial direction, and the mounting tubular portion 17 and the outer ring portion 18. And a plurality of ribs 19. The mounting cylinder portion 17, the outer ring portion 18, and the rib 19 are made of, for example, an aluminum alloy, and are integrally formed by a single member.

The mounting cylinder portion 17 has a cylindrical shape centered on the axis O.
The outer ring portion 18 has a cylindrical shape centered on the axis O. The outer ring portion 18 has a plurality of key groove portions (not shown) on the outer peripheral surface. The plurality of key groove portions are recessed from the outer peripheral surface of the outer ring portion 18 toward the inner side in the tire radial direction, and extend along the tire width direction H. The plurality of key groove portions are arranged on the outer peripheral surface of the outer ring portion 18 at equal intervals in the tire circumferential direction.
The plurality of ribs 19 are arranged at equal intervals in the circumferential direction.

The inner cylinder 12 is made of resin. The inner cylindrical body 12 has a cylindrical shape centered on the axis O. The inner cylindrical body 12 is fitted on the outer side of the mounting body 11. That is, in the present embodiment, the inner cylindrical body 12 is provided separately from the mounting body 11. However, the present invention is not limited to this, and the inner cylindrical body 12 may be formed integrally with the mounting body 11.

The inner cylindrical body 12 has a plurality of rib portions 12a on its inner peripheral surface. The plurality of rib portions 12a protrude from the inner peripheral surface of the inner cylindrical body 12 toward the inner side in the tire radial direction and extend along the tire width direction H.
The plurality of ribs 12a are arranged on the inner peripheral surface of the inner cylindrical body 12 at equal intervals in the tire circumferential direction. Each rib portion 12 a fits into each key groove portion of the outer ring portion 18.

The outer cylinder body 13 is made of resin. The outer cylindrical body 13 has a cylindrical shape centered on the axis O. The outer cylindrical body 13 is arranged at a distance from the inner cylindrical body 12 in the tire radial direction. The dimension of the outer tubular body 13 in the tire width direction H is larger than the dimension of the inner tubular body 12 in the tire width direction H. The outer tubular body 13 projects to both outer sides in the tire width direction H with respect to the inner tubular body 12.

The outer cylindrical body 13 has an outer peripheral surface 13a and a side surface 13b.
The outer peripheral surface 13a is a surface of the outer cylindrical body 13 that faces the outer side in the tire radial direction. In the present embodiment, the outer diameter of the outer peripheral surface 13a is constant along the tire width direction H.
The side surface 13b is a surface of the outer tubular body 13 that faces the outside in the tire width direction H. The side surface 13b is an annular shape that extends over the entire circumference in the tire circumferential direction. In the present embodiment, the side surface 13b has a planar shape perpendicular to the axis O.

The connecting portion (intersection ridgeline) connecting the outer peripheral surface 13a and the side surface 13b is a ring extending over the entire circumference in the tire circumferential direction. In the present embodiment, as shown in FIG. 4, the angle between the outer peripheral surface 13a and the side surface 13b is 90° in a cross-sectional view along the tire width direction H. This angle has the same value as the opening angle θ1 of the tread member 16 described later.

The connecting member 15 is made of resin. As shown in FIGS. 1 to 3, the connecting member 15 connects the outer peripheral surface of the inner cylindrical body 12 and the inner peripheral surface of the outer cylindrical body 13 in a relatively elastically displaceable manner. The connecting member 15 has a plate shape. A plurality of connecting members 15 are provided. The plurality of connecting members 15 are arranged at equal intervals in the tire circumferential direction.
The connecting member 15 has a first connecting plate 21 and a second connecting plate 22.

The first connecting plate 21 is a plate material that is elastically deformable. The first connecting plate 21 is located between the inner cylindrical body 12 and the outer cylindrical body 13 on one side of the center C in the tire width direction H. The dimension of the first connecting plate 21 in the tire width direction H is smaller than half the dimension of the outer tubular body 13 in the tire width direction H. The dimension of the first connecting plate 21 in the tire width direction H is smaller than half the dimension of the inner cylinder 12 in the tire width direction H.

A plurality of first connecting plates 21 are provided. The plurality of first connecting plates 21 are arranged at equal intervals in the tire circumferential direction. The outer end portion of the first connecting plate 21 in the tire radial direction is connected to the inner peripheral surface of the outer tubular body 13. The inner end portion of the first connecting plate 21 in the tire radial direction is connected to the outer peripheral surface of the inner cylindrical body 12. The first connecting plate 21 extends toward one side in the tire circumferential direction from the outer end portion of the first connecting plate 21 toward the inner side in the tire radial direction.
The first connecting plate 21 is integrally formed with the inner cylindrical body 12 and the outer cylindrical body 13 by injection molding.

The second connecting plate 22 is a plate material that is elastically deformable. The second connecting plate 22 is located between the inner cylinder 12 and the outer cylinder 13 on the other side of the center C in the tire width direction H. That is, the first connecting plate 21 and the second connecting plate 22 are arranged apart from each other in the tire width direction H. The dimension of the second connecting plate 22 in the tire width direction H is smaller than half the dimension of the outer tubular body 13 in the tire width direction H. The dimension of the second connecting plate 22 in the tire width direction H is smaller than half the dimension of the inner cylinder 12 in the tire width direction H.

A plurality of second connecting plates 22 are provided. The plurality of second connecting plates 22 are arranged at equal intervals in the tire circumferential direction. The outer end portion of the second connecting plate 22 in the tire radial direction is connected to the inner peripheral surface of the outer tubular body 13. The inner end portion of the second connecting plate 22 in the tire radial direction is connected to the outer peripheral surface of the inner cylindrical body 12. The second connecting plate 22 extends toward the other side in the tire circumferential direction from the outer end portion of the second connecting plate 22 toward the inner side in the tire radial direction.
The second connecting plate 22 is integrally formed with the inner cylindrical body 12 and the outer cylindrical body 13 by injection molding.

The dimension in which the first connecting plate 21 extends (the total length of the first connecting plate 21) and the dimension in which the second connecting plate 22 extends (the total length of the second connecting plate 22) are the same. The dimension (width) of the first connecting plate 21 in the tire width direction H and the dimension of the second connecting plate 22 in the tire width direction H are the same.
The thickness of the first connecting plate 21 and the thickness of the second connecting plate 22 are the same.

The tread member 16 is made of rubber or resin. The tread member 16 is formed of, for example, natural rubber, vulcanized rubber obtained by vulcanizing a rubber composition, or a thermoplastic material. From the viewpoint of wear resistance, it is preferable to form the tread member 16 with vulcanized rubber. Examples of thermoplastic materials include thermoplastic elastomers and thermoplastic resins.

Examples of the thermoplastic elastomer include amide thermoplastic elastomer (TPA), ester thermoplastic elastomer (TPC), olefin thermoplastic elastomer (TPO), styrene thermoplastic elastomer (TPS), and urethane defined in JIS K6418. Examples include thermoplastic elastomers (TPU), crosslinked thermoplastic rubbers (TPV), and other thermoplastic elastomers (TPZ).
Examples of the thermoplastic resin include urethane resin, olefin resin, vinyl chloride resin, and polyamide resin.

As shown in FIGS. 3 and 4, the tread member 16 has a substantially cylindrical shape centered on the axis O. The tread member 16 covers the outer cylindrical body 13 from the outer side in the tire radial direction. The inner peripheral surface of the tread member 16 contacts the outer peripheral surface 13 a of the outer cylindrical body 13. The tread member 16 and the outer cylinder body 13 are fixed to each other with an adhesive or the like. The outer diameter of the tread member 16 is constant along the tire width direction H. At least one groove portion (not shown) may be provided on the outer peripheral surface of the tread member 16.

The dimension of the tread member 16 in the tire width direction H is larger than the dimension of the outer tubular body 13 in the tire width direction H. The tread member 16 projects outward in the tire width direction H with respect to the outer cylinder body 13.
In the illustrated example, the tread member 16 projects to both outer sides in the tire width direction H with respect to the outer tubular body 13. The tread member 16 also covers the outer cylindrical body 13 from the outer side in the tire width direction H. In the present embodiment, the tread member 16 covers the outer tubular body 13 from both outer sides in the tire width direction H.
The tread member 16 has a tread body 16a and a tread ear 16b.

The tread body 16a has a cylindrical shape centered on the axis O. The tread body 16a covers the outer tubular body 13 from the outside in the tire radial direction. The inner peripheral surface 16c of the tread body portion 16a contacts the outer peripheral surface 13a of the outer cylindrical body 13.
The tread body portion 16a is a portion of the tread member 16 that overlaps with the outer tubular body 13 when viewed in the tire radial direction. The tread body 16a overlaps with the outer peripheral surface 13a of the outer tubular body 13 when viewed in the tire radial direction. Reference numeral BS shown in the drawing is an imaginary boundary surface that passes through the outer end of the outer tubular body 13 in the tire width direction H and is perpendicular to the axis O. The tread body portion 16a is a portion of the tread member 16 located inside the boundary surface BS in the tire width direction H. That is, the tread body portion 16a is a portion of the tread member 16 located between the pair of boundary surfaces BS in the tire width direction H. The dimension of the tread body portion 16a in the tire width direction H is equal to the dimension of the outer tubular body 13 in the tire width direction H.

In the present embodiment, the inner diameter of the inner peripheral surface 16c of the tread body 16a is constant along the tire width direction H. The outer diameter of the outer peripheral surface of the tread body 16a is constant along the tire width direction H. That is, in the present embodiment, the dimension (thickness) of the tread body portion 16a in the tire radial direction is constant along the tire width direction H.

The tread ear portion 16b has a circular ring plate shape centered on the axis O. The tread ear portion 16b is connected to the tread body portion 16a in the tire width direction H, and is located outside the outer tubular body 13 in the tire width direction H. In the present embodiment, two tread ears 16b are provided so as to be connected to both ends of the tread body 16a in the tire width direction H.
The tread ear portion 16b is a portion of the tread member 16 that does not overlap the outer tubular body 13 when viewed in the tire radial direction. The tread ear portion 16b does not overlap with the outer peripheral surface 13a of the outer tubular body 13 when viewed in the tire radial direction. The tread ear portion 16b is a portion of the tread member 16 located outside the boundary surface BS in the tire width direction H.

The dimension L1 of the tread ear portion 16b in the tire radial direction is constant along the tire width direction H. In the present embodiment, the tire radial dimension L1 of the tread ear portion 16b is larger than the tire radial dimension (maximum thickness) of the tread main body portion 16a. The tread ear portion 16b has a portion (a cover portion 16d described later) that protrudes inward in the tire radial direction with respect to the tread body portion 16a. The inner diameter of the inner peripheral surface of the tread ear portion 16b is smaller than the inner diameter of the inner peripheral surface 16c of the tread body portion 16a. The inner diameter of the inner peripheral surface of the tread ear portion 16b is constant along the tire width direction H. In the present embodiment, the inner diameter of the tread ear portion 16b and the inner diameter of the end portion of the outer tubular body 13 in the tire width direction H are the same. In the present embodiment, the tread ear portion 16b covers the outer tubular body 13 from the outside in the tire width direction H. The two tread ears 16b cover the outer tubular body 13 from both outer sides in the tire width direction H.
The outer diameter of the outer peripheral surface of the tread ear portion 16b is constant along the tire width direction H. In this embodiment, the outer diameter of the tread ear portion 16b and the outer diameter of the tread body portion 16a are the same.
In the present embodiment, the outer surface of the tread ear portion 16b that faces the outside in the tire width direction H is a flat surface that is perpendicular to the axis O.

As shown in FIG. 4, the dimension W of the tread ear 16b in the tire width direction H is smaller than the dimension L1 of the tread ear 16b in the tire radial direction. The dimension W of the tread ear portion 16b in the tire width direction H is 1 mm or more. The dimension W of the tread ear portion 16b in the tire width direction H is 10 mm or less.

The tread ear portion 16b has a cover portion 16d.
The cover portion 16d is located inside the inner peripheral surface 16c of the tread body portion 16a in the tire radial direction. When viewed in the tire width direction H, the cover portion 16d is arranged so as to overlap the outer tubular body 13. In the present embodiment, the cover portion 16d overlaps the entire area of the side surface 13b of the outer tubular body 13 when viewed in the tire width direction H. The cover portion 16d contacts the outer tubular body 13 from the outside in the tire width direction H. In the present embodiment, the dimension W of the tread ear portion 16b in the tire width direction H is larger than the dimension L2 of the cover portion 16d in the tire radial direction. Alternatively, the dimension W and the dimension L2 are the same as each other.

The cover portion 16d has an inner surface 16e.
The inner surface 16e faces the inner side in the tire width direction H and contacts the side surface 13b of the outer cylindrical body 13. In the present embodiment, the inner surface 16e has a planar shape perpendicular to the axis O. The inner surface 16e contacts the side surface 13b over the entire length of the side surface 13b in the tire radial direction.

The connecting portion (intersection valley line) that connects the inner peripheral surface 16c of the tread body portion 16a and the inner surface 16e of the cover portion 16d is an annular shape that extends over the entire circumference in the tire circumferential direction. In the present embodiment, as shown in FIG. 4, the opening angle θ1 between the inner peripheral surface 16c and the inner surface 16e is 90° in the cross-sectional view along the tire width direction H.

According to the non-pneumatic tire 1 of the present embodiment described above, the side surface 13b of the outer tubular body 13 that faces the tire width direction H is protected by the tread ear portion 16b and its cover portion 16d. For this reason, for example, when the non-pneumatic tire 1 comes into contact with a curb or rides on it, the outer cylinder 13 is less likely to directly collide with the curb, etc., and damage to the outer cylinder 13 is suppressed. That is, the outer cylinder 13 is protected by the tread member 16.

Further, the tread ear portion 16b has a smaller dimension W in the tire width direction H than the dimension L1 in the tire radial direction. Therefore, for example, when the non-pneumatic tire 1 comes into contact with a curb or rides on it, the tread ear portion 16b is prevented from being largely deformed in the tire radial direction or the like. As a result, damage to the tread ears 16b (cutting of ears, etc.) can be suppressed, and damage to the tread member 16 can be suppressed.

Further, in the present embodiment, the dimension W of the tread ear portion 16b in the tire width direction H is 1 mm or more.
When the dimension W of the tread ear portion 16b in the tire width direction H is 1 mm or more, it is possible to stably prevent the curbstone or the like from coming into contact with the outer cylindrical body 13. Further, when a curb or the like comes into contact with the tread ear portion 16b, the magnitude of the impact transmitted to the outer cylindrical body 13 via the tread ear portion 16b can be stably suppressed to be small. Therefore, damage to the outer cylindrical body 13 is stably suppressed.

Further, in the present embodiment, the dimension W of the tread ear portion 16b in the tire width direction H is 10 mm or less.
If the dimension W of the tread ears 16b in the tire width direction H is 10 mm or less, the tread ears 16b may be deformed in the tire radial direction or the like when the non-pneumatic tire 1 comes into contact with a curb or rides on it. Can be suppressed more stably. Therefore, the cutting of the tread ear portion 16b is stably suppressed.

A modified example of the present embodiment will be described.
5 and 6 show modified examples of the non-pneumatic tire 1. In this modification, the outer diameter of the tread member 16 changes along the tire width direction H. The outer diameter of the tread member 16 increases from both ends of the tread member 16 in the tire width direction H toward the center C.

In FIG. 6, the dimension of the tread ear portion 16b in the tire radial direction increases from the outer end of the tread ear portion 16b in the tire width direction H toward the inside. In this case, the "dimension in the tire radial direction of the tread ear portion" of the constituent element of the present invention refers to the dimension (maximum dimension) L1 of the tread ear portion 16b in the tire radial direction on the boundary surface BS. The dimension W of the tread ear portion 16b in the tire width direction H is smaller than the dimension L1 of the tread ear portion 16b in the tire radial direction.
In this modification, the dimension L1 of the tread ear portion 16b in the tire radial direction is smaller than the dimension (maximum thickness) of the tread body portion 16a in the tire radial direction.

In this modification, the dimension W of the tread ear portion 16b in the tire width direction H is smaller than the dimension L2 of the cover portion 16d in the tire radial direction.

Also in this modification, the same effect as the above can be obtained.
Further, since the dimension W of the tread ear portion 16b in the tire width direction H is smaller than the dimension L2 of the cover portion 16d in the tire radial direction, even if the tread ear portion 16b comes into contact with a curb or the like and is deformed, the tread ear portion 16b is less likely to be damaged (cutting of ears etc.)

<Second Embodiment>
Next, the non-pneumatic tire 2 of the second embodiment of the present invention will be described with reference to FIG. 7. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The non-pneumatic tire 2 of the present embodiment differs from the above-described embodiments in the configurations of the connecting member 15, the outer cylinder body 13 and the tread member 16.

In the present embodiment, the connecting member 15 has a third connecting plate 23 instead of the first connecting plate 21 and the second connecting plate 22.
The third connecting plate 23 is an elastically deformable plate material. The third connecting plate 23 has a portion located on the center C in the tire width direction H between the inner tubular body 12 and the outer tubular body 13. The dimension of the third connecting plate 23 in the tire width direction H is substantially the same as the dimension of the outer tubular body 13 in the tire width direction H.

A plurality of third connecting plates 23 are provided. The plurality of third connecting plates 23 are arranged at equal intervals in the tire circumferential direction. The outer end portion of the third connecting plate 23 in the tire radial direction is connected to the inner peripheral surface of the outer tubular body 13. The inner end portion of the third connecting plate 23 in the tire radial direction is connected to the outer peripheral surface of the inner cylindrical body 12. The third connecting plate 23 extends toward one side in the tire circumferential direction from the outer end portion of the third connecting plate 23 toward the inner side in the tire radial direction.
The third connecting plate 23 is integrally formed with the inner cylindrical body 12 and the outer cylindrical body 13 by injection molding.

The outer cylindrical body 13 has a first inclined surface 13c.
The first inclined surface 13c is arranged on the outer peripheral surface 13a of the outer cylindrical body 13 and extends toward the inner side in the tire radial direction as it extends toward the outer side in the tire width direction H. The first inclined surface 13c is located at the end of the outer peripheral surface 13a in the tire width direction H. In this embodiment, two first inclined surfaces 13c are provided on the outer peripheral surface 13a. The two first inclined surfaces 13c are arranged at both ends of the outer peripheral surface 13a in the tire width direction H.

The connection portion (intersection ridgeline) connecting the first inclined surface 13c and the side surface 13b is an annular shape extending over the entire circumference in the tire circumferential direction. In the present embodiment, as shown in FIG. 7, the angle between the first inclined surface 13c and the side surface 13b is an obtuse angle larger than 90° in a sectional view along the tire width direction H. This angle has the same value as the opening angle θ2 of the tread member 16 described later.

The tread body 16a has a second inclined surface 16f.
The second inclined surface 16f is disposed on the inner peripheral surface 16c of the tread body portion 16a, extends toward the inner side in the tire radial direction toward the outer side in the tire width direction H, and extends toward the first inclined surface 13c of the outer tubular body 13. Contact. The second inclined surface 16f is located at the end of the inner peripheral surface 16c in the tire width direction H.
In this embodiment, two second inclined surfaces 16f are provided on the inner peripheral surface 16c. The two second inclined surfaces 16f are arranged at both ends of the inner peripheral surface 16c in the tire width direction H.

The dimension of the tread ear portion 16b in the tire radial direction increases from the outer end of the tread ear portion 16b in the tire width direction H toward the inner side. In this case, the "dimension in the tire radial direction of the tread ear portion" of the constituent element of the present invention refers to the dimension (maximum dimension) L1 of the tread ear portion 16b in the tire radial direction on the boundary surface BS. The dimension (maximum dimension) W of the tread ear portion 16b in the tire width direction H is smaller than the dimension L1 of the tread ear portion 16b in the tire radial direction.

The inner diameter of the tread ear portion 16b decreases from the outer end of the tread ear portion 16b in the tire width direction H toward the inner side, and becomes the smallest on the boundary surface BS. That is, the inner circumferential surface of the tread ear portion 16b that faces the inner side in the tire radial direction extends toward the inner side in the tire radial direction as it goes inward in the tire width direction H.
The outer diameter of the tread ear portion 16b increases from the outer end of the tread ear portion 16b in the tire width direction H toward the inside, and becomes maximum on the boundary surface BS. That is, the outer peripheral surface of the tread ear portion 16b, which faces the outer side in the tire radial direction, extends toward the outer side in the tire radial direction as it goes inward in the tire width direction H.

In the present embodiment, the cover portion 16d overlaps the outer end portion of the side surface 13b of the outer tubular body 13 in the tire radial direction when viewed in the tire width direction H. That is, the cover portion 16d is arranged so as to overlap with at least a part of the outer tubular body 13 when viewed in the tire width direction H. The cover portion 16d contacts the side surface 13b from the outside in the tire width direction H.
The inner surface 16e of the cover 16d contacts the outer end of the side surface 13b in the tire radial direction. The inner surface 16e has a planar shape perpendicular to the axis O. An inner peripheral surface of the cover portion 16d that faces the inner side in the tire radial direction extends toward the outer side in the tire radial direction as it goes to the outer side in the tire width direction H. The cover portion 16d has a larger dimension (thickness) in the tire width direction H toward the outer side in the tire radial direction.

The connecting portion (intersection valley line) that connects the second inclined surface 16f of the tread body portion 16a and the inner surface 16e of the cover portion 16d is a ring extending over the entire circumference in the tire circumferential direction. In the present embodiment, as shown in FIG. 7, in a sectional view along the tire width direction H, the opening angle θ2 between the second inclined surface 16f and the inner surface 16e is an obtuse angle larger than 90°.

According to the non-pneumatic tire 2 of the present embodiment described above, the same operational effects as the above-described embodiments can be obtained.

Further, in the present embodiment, the dimension of the cover portion 16d in the tire width direction H increases toward the outer side in the tire radial direction.
In this case, the wall thickness of the cover portion 16d in the tire width direction H can be increased (maximum) at the outer end portion in the tire radial direction of the cover portion 16d, which is particularly prone to ear cutting. Therefore, damage to the tread ear portion 16b is further suppressed.

Further, in the present embodiment, the opening angle θ2 between the second inclined surface 16f and the inner surface 16e of the tread member 16 is an obtuse angle in a cross-sectional view along the tire width direction H.
In this case, the cutting of the tread ear portion 16b is further suppressed.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, as described below, a configuration change or the like is possible without departing from the spirit of the present invention.

In the above-described embodiment, the tread member 16 has two tread ear portions 16b, but the present invention is not limited to this. The tread member 16 may have one tread ear portion 16b. In this case, the tread ear portion 16b is connected to the tire width direction H with any one of the both ends of the tread body portion 16a in the tire width direction H.

According to the present invention, the side surface of the outer tubular body facing the tire width direction is protected by the tread ear portion and the cover portion thereof. For this reason, for example, when the non-pneumatic tire comes into contact with a curbstone or rides on the curbstone, the outer cylinder is less likely to directly collide with the curbstone, etc., and damage to the outer cylinder is suppressed. That is, the outer cylinder is protected by the tread member.

Also, the tread ears are smaller in the tire width direction than in the tire radial direction. Therefore, for example, when the non-pneumatic tire comes into contact with a curb or the like or rides on the curb, the tread ear is prevented from being largely deformed in the tire radial direction or the like. Thereby, damage to the tread ears (cutting of ears, etc.) is suppressed, and damage to the tread member can be suppressed.

In the above non-pneumatic tire, it is preferable that the tread ear portion has a dimension in the tire width direction of 1 mm or more.

When the dimension of the tread ear in the tire width direction is 1 mm or more, it is possible to stably prevent the curbstone or the like from coming into contact with the outer cylinder. Further, when a curb or the like comes into contact with the tread ears, the magnitude of the impact transmitted to the outer tubular body via the tread ears can be stably suppressed to a small level. Therefore, damage to the outer cylinder is stably suppressed.

In the above non-pneumatic tire, it is preferable that the tread ear portion has a dimension in the tire width direction of 10 mm or less.

When the dimension of the tread ears in the tire width direction is 10 mm or less, it is possible to more stably prevent the tread ears from being deformed in the tire radial direction or the like when the non-pneumatic tire comes into contact with a curb or rides on it. It can be suppressed. Therefore, the cutting of the tread ears is stably suppressed.

In the non-pneumatic tire, it is preferable that the tire width direction dimension of the tread ear portion is smaller than the tire radial direction dimension of the cover portion.

In this case, even if the tread ears come into contact with a curb or the like and are deformed, the tread ears are less likely to be damaged (cutting of ears, etc.).

In the above non-pneumatic tire, it is preferable that the cover portion has a larger dimension in the tire width direction toward the outer side in the tire radial direction.

In this case, the thickness of the cover portion in the tire width direction can be increased (maximum) at the outer end portion of the cover portion in the tire radial direction where it is particularly easy to cut the edges. Therefore, damage to the tread ears is further suppressed.

In the non-pneumatic tire, the outer cylindrical body is arranged on an outer peripheral surface of the outer cylindrical body, and a first inclined surface extending toward an inner side in a tire radial direction toward an outer side in the tire width direction, and a tire width direction. A side surface that faces the outside of the tread body, the tread body is disposed on an inner peripheral surface of the tread body, and extends inward in the tire radial direction toward the outside in the tire width direction. The second sloped surface has a second sloped surface that contacts the sloped surface, the cover portion has an inner surface that faces the inside in the tire width direction, and has an inner surface that contacts the side surface. The opening angle between the inner surface and the inner surface is preferably an obtuse angle.

　In this case, the cutting of the tread ears is further suppressed.

In addition, the configurations (constituent elements) described in the above-described embodiments, modified examples, and notes may be combined without departing from the spirit of the present invention, and addition, omission, replacement of the configurations, other It can be changed. The present invention is not limited to the above-described embodiments, but is limited only by the claims.

1, 2... Non-pneumatic tire, 12... Inner cylinder, 13... Outer cylinder, 13a... Outer peripheral surface, 13b... Side surface, 13c... First inclined surface, 15... Connecting member, 16... Tread member, 16a... Tread Body part, 16b...Tread ear part, 16c...Inner peripheral surface, 16d...Cover part, 16e...Inner surface, 16f...Second inclined surface, H...Tire width direction, L1...Tread ear part dimension in tire radial direction, L2 …Dimensions of the cover in the tire radial direction, W…Dimensions of the tread ear in the tire width direction, O…Axis, θ2…Opening angle

Claims

An inner cylinder centered on the axle of the axle,
An outer cylinder body that surrounds the inner cylinder body from the outside in the tire radial direction,
A connecting member that connects the outer peripheral surface of the inner cylindrical body and the inner peripheral surface of the outer cylindrical body and is elastically deformable,
A tread member attached to the outer cylinder body,
The tread member,
A tread body that covers the outer cylinder from the outside in the tire radial direction,
The tread body is connected to the tire width direction, and has a tread ear portion located outside the outer cylinder body in the tire width direction,
The tread ear portion has a cover portion arranged so as to overlap the outer tubular body when viewed from the tire width direction,
The tire width direction dimension of the tread ears is smaller than the tire radial dimension of the tread ears,
Non-pneumatic tire.
The tire width direction dimension of the tread ear is 1 mm or more,
The non-pneumatic tire according to claim 1.
The tire widthwise dimension of the tread ear is 10 mm or less,
The non-pneumatic tire according to claim 1.
The tire width direction dimension of the tread ear portion is smaller than the tire radial direction dimension of the cover portion,
The non-pneumatic tire according to any one of claims 1 to 3.
The cover portion has a dimension in the tire width direction that increases toward the outer side in the tire radial direction,
The non-pneumatic tire according to any one of claims 1 to 4.
The outer cylinder is
A first inclined surface that is arranged on the outer peripheral surface of the outer tubular body and extends toward the inner side in the tire radial direction as it extends toward the outer side in the tire width direction;
A side surface that faces the outer side in the tire width direction,
The tread body portion is disposed on an inner peripheral surface of the tread body portion, has a second inclined surface that extends inward in the tire radial direction toward the outer side in the tire width direction, and contacts the first inclined surface. Then
The cover portion faces an inner side in the tire width direction and has an inner surface that comes into contact with the side surface,
In a cross-sectional view along the tire width direction, the opening angle between the second inclined surface and the inner surface is an obtuse angle,
The non-pneumatic tire according to any one of claims 1 to 5.