KR101606051B1 - Tire of Energy Saving Type - Google Patents

Abstract

The present invention relates to a tire comprising a tire body formed in a ring shape and two ring-shaped retaining rings spaced apart from each other with respect to the width direction on the outer circumferential surface of the tire body, wherein the outer circumferential surface is in contact with the ground The height of the outer circumferential surface being higher than the outer circumferential surface of the fixed portion and being deformed at a portion contacting the ground at the time of deceleration or deceleration, And an expandable and contractible portion which is increased to an increased amount.

Description

Tire of Energy Saving Type}

The present invention relates to an energy-saving tire capable of raising the feeling of stability at the time of traveling while saving energy.

The MTB bicycle has a relatively wide width of the tire, which has a sense of stability at the time of braking and braking, but it has a disadvantage that the friction area with the ground is wider and the force for rotating the tire is consumed. In particular, the MTB bicycle requires a lot of effort to increase the running speed for driving. On the other hand, cyclic bicycles have a disadvantage in that the width of the tires is relatively narrow so that the friction area with the tires is small, the power is low and the running speed is fast, but the braking is slow and the stability is low. In particular, the cycling bicycle has a low sense of stability when the running speed is reduced for deceleration or braking.

The problem of the width of the tire is similar to that of a bicycle as well as a motorcycle and an automobile.

The present invention provides an energy-saving tire in which the contact area with the ground is increased to reduce the contact area with the ground at the time of accelerating or traveling, thereby reducing energy consumption.

The energy-saving tire of the present invention comprises a tire main body formed in a ring shape and two ring-shaped retaining rings spaced apart from each other with respect to the width direction on the outer circumferential surface of the tire main body, And the fixing ring is disposed between the stationary ring and the stationary ring, and the height of the outer circumferential surface is formed to be higher than the outer circumferential surface of the stationary portion and is deformed at a portion contacting the ground at the time of deceleration or deceleration, And a stretchable portion which is increased before the deformation.

The stretchable and contractible portion is formed in a quadrangular pyramid shape having an upper surface and a lower surface. The lower surface of the stretchable and contractible portion is in contact with the outer circumferential surface of the tire main body and a plurality of the telescopic protrusions and rings Shape and has a width at least equal to the width of the upper surface of the stretchable member and an inner circumferential surface formed to contact the upper surface of the stretchable member. The stretchable and contractible protrusions may have a first surface and a second surface which are parallel to the side surface of the tire body and are opposed to each other and a second surface which is perpendicular to the first surface and which is opposite to the traveling direction of the tire when the stretchable protrusion is close to the ground surface Wherein the third surface is formed to be perpendicular to the tangential surface of the outer circumferential surface of the tire main body at a position where the third surface is in contact with the tire main body, The four surfaces may be inclined to the third surface with respect to a surface perpendicular to the tangential surface of the outer circumferential surface of the tire main body. The expansion and contraction protrusion may further include a deformation groove formed on the lower surface in the direction from the fourth surface to the third surface and rounded at the end.

In addition, the extension / contraction protrusion may be integrally formed with the tire main body.

In addition, the stretchable and contractible portion may be formed in a plate-like shape, and may further include a shielding plate shielding a space formed between the telescopic protrusion and the telescopic ring.

The stretchable and contractible portion is formed in a shape of a telescopic ring and a quadrangular pyramid extending in the circumferential direction from the center in the width direction of the outer circumferential surface of the tire main body in the circumferential direction and formed in a ring shape having a height higher than that of the stationary ring, A first surface or a second surface, which are arranged along the circumferential direction on the outer circumferential surface of the tire main body and are arranged on both sides of the expansion / contraction ring and face each other in the same direction as the outer surface of the tire main body, And the extension and contraction protrusions are formed so as to be in contact with the opposite side surfaces of the protrusion. At this time, the expansion and contraction ridge is formed to have a height equal to or smaller than the height of the expansion ring, and is formed to have a height higher than the height of the fixed ring, and may be arranged to be symmetrical on both sides with respect to the expansion ring or alternately arranged. In addition, the expansion and contraction protrusion and the expansion and contraction ring may be integrally formed with the tire main body.

The energy saving tires according to the present invention are designed to reduce the contact area with the ground to increase the stability of the running stability of the tire and to reduce the contact area with the ground during acceleration or running so as to save energy .

1 is a front view of an energy-saving tire according to an embodiment of the present invention.
2 is a side view of an energy-saving tire according to an embodiment of the present invention.
3 is a sectional view taken along the line AA in Fig.
4 is a sectional view taken along the line BB of Fig.
5 is an enlarged view of "C" in FIG.
6 is a front view of an energy-saving tire according to another embodiment of the present invention.
7 is a side view of an energy-saving tire according to another embodiment of the present invention.
FIG. 8 is a cross-sectional view corresponding to FIG. 3 of a deceleration or deceleration of an energy-saving tire according to an embodiment of the present invention. FIG.
Fig. 9 is a front view of the tire of Fig. 8; Fig.
10 is a side view corresponding to FIG. 2 of an energy-saving tire according to another embodiment of the present invention.
11 is a cross-sectional view corresponding to FIG. 3 of an energy-saving tire according to another embodiment of the present invention.
12 is a sectional view taken along line DD of Fig.
13 is a sectional view taken along the line EE in Fig.

Hereinafter, an energy-saving tire according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, an energy-saving tire according to an embodiment of the present invention will be described.

1 is a front view of an energy-saving tire according to an embodiment of the present invention. 2 is a side view of an energy-saving tire according to an embodiment of the present invention. 3 is a sectional view taken along the line AA in Fig. 4 is a sectional view taken along the line BB of Fig. 5 is an enlarged view of "C" in Fig. 6 is a front view of an energy-saving tire according to another embodiment of the present invention. 7 is a side view of an energy-saving tire according to another embodiment of the present invention.

1 to 7, the energy-saving tire 100 according to an embodiment of the present invention includes a tire body 110, a fixing portion 120, and a stretchable and contractible portion 130.

When the energy-saving tire 100 is stopped, decelerated or stopped, the contact area between the ground surface (a) and the tire is increased while the fixing portion 120 and the stretchable and contractible portion 130 are in contact with the ground surface (a) And the area of contact between the ground surface (a) and the tire is reduced while the stretchable and contractible portion 130 is in contact with the ground surface (a) at the time of acceleration or running, thereby saving energy.

The energy-saving tire 100 may include bicycle tires, motorcycle tires, and automobile tires. Here, energy means the force of a person or the force of an engine necessary to rotate the tire.

The tire body 110 includes a wheel coupling hole 110a and an inner hollow portion 110a. The tire main body 110 has a ring shape and may be formed in a general tire shape. The tire main body 110 determines the overall shape of the tire and supports the fixed portion 120 and the stretchable and contractible portion 130. The tire body 110 is generally formed of a rubber material used for manufacturing a tire.

The wheel coupling hole 110a is formed through the central portion of the tire body 110 from one side to the other side, and a tire wheel (not shown) is inserted and coupled. Therefore, the wheel engaging hole 110a is formed to have an inner diameter corresponding to the outer diameter of the tire wheel to be engaged.

The inner hollow portion 110b is a space formed in the outward direction between the wheel engagement holes 110a. The inner hollow portion 110b provides a space for filling air or gas such as nitrogen necessary for maintaining the elasticity of the tire.

The fixing portion 120 is formed in a ring shape having a predetermined width and height and is formed on both sides with respect to the width direction on the outer peripheral surface of the tire main body 110. That is, the fixing portion 120 is formed of two fixing rings 120a and 120b that are spaced from each other on both sides of the outer circumferential surface of the tire body 110. [ The fixing portion 120 is formed to have a proper width according to the width of the tire main body 110 or the width of the expandable portion 130. The fixing portion 120 is preferably formed such that the entire width of the two fixing rings 120a and 120b is smaller than the width of the expandable portion 130. [ Since the outer peripheral surface of the fixed portion 120 is spaced apart from the ground surface a at the time of acceleration or traveling while the outer peripheral surface of the fixed portion 120 is in contact with the ground surface a together with the stretchable and contractible portion 130, It is necessary to make it relatively large.

The fixing portion 120 is formed of an elastic rubber material and is made of the same material as the tire main body 110. Further, the fixing portion 120 is preferably formed integrally with the tire main body 110. That is, the fixing portion 120 may be formed integrally with the tire main body 110.

The fixing portion 120 may be formed with a tread pattern (not shown) which is generally formed on the tire on an outer circumferential surface contacting the ground surface (a). The tread pattern improves the braking force by increasing the frictional force between the fixed portion 120 and the ground surface (a).

The stretchable and contractible portion 130 is formed to include the stretchable protrusion 140 and the stretchable ring 150. 6 and 7, the stretchable and contractible portion 130 may further include a shielding plate 160. [

The stretchable and contractible portion 130 is formed between the fixing rings 120a and 120b of the fixing portion 120 formed on both sides of the outer circumferential surface of the tire body 110. [ At this time, the stretchable and contractible portion 130 is formed such that the side surfaces thereof are spaced apart from the side surfaces of the stationary rings 120a and 120b. The stretchable and contractible portion 130 is formed along the outer circumferential surface of the tire body 110 and is formed to have a ring shape as a whole. When the tire main body 110 is wide, a plurality of the stretchable and contractible parts 130 may be spaced apart from each other in the width direction of the tire main body 110.

Since the stretchable and contractible portion 130 contacts the ground surface a alone at the time of acceleration or running of the tire, the width is preferably at least larger than the width of the fixing portion 120. Accordingly, the stretchable and contractible portion 130 has a relatively large contact area with the ground surface (a), and stably supports the tire.

The height of the stretchable and contractible portion 130 is preferably higher than the height of the fixing portion 120. Accordingly, the stretchable and contractible portion 130 is deformed at the time of deceleration or retardation of the tire and is at the same height as the fixed portion 120 and comes into contact with the ground surface (a). When the tire is accelerated or traveled, 120b so as to come into contact with the paper surface a alone.

The expansion and contraction protrusion 140 is formed in a quadrangular pyramid shape and is formed between the fixing rings 120a and 120b of the fixing portion 120 on the outer peripheral surface of the tire body 110. [ The expansion and contraction protrusion 140 is located such that the upper portion of the quadrangular pyramid is directed to the outer side of the outer peripheral surface of the tire main body 110. A plurality of the expansion and contraction protrusions 140 are spaced apart from each other along the outer peripheral surface of the tire body 110 at predetermined intervals.

The expansion and contraction protrusion 140 has a first surface 141 and a second surface 142 parallel to the side surface of the tire main body 110 and perpendicular to the first surface 141 and the expansion and contraction protrusion 140 A third surface 143 that faces the direction opposite to the traveling direction of the tire when approaching the paper surface a, and a fourth surface 144 that is the opposite surface of the third surface. The first surface 141 and the second surface 142 may be formed such that the spacing distance increases in a downward direction. That is, the first surface 141 and the second surface 142 may be inclined in the lateral direction of the tire body 110. The extension and contraction protrusion 140 is formed with an upper surface 145 and a lower surface 146. The first surface 141 and the second surface 142 have a trapezoidal shape. The third surface 143 and the fourth surface 144 have a rectangular shape. The third surface 143 is formed to be perpendicular to the tangential surface of the outer circumferential surface of the tire main body 110 at a position where the third surface 143 contacts the tire main body 110. The fourth surface 144 is formed at an acute angle with the tangential surface of the outer circumferential surface of the tire main body 110 at a position where the fourth surface 144 contacts the tire main body 110. That is, the fourth surface 144 is inclined to the third surface 143 with respect to a surface perpendicular to the tangential surface of the outer circumferential surface of the tire main body 110. Accordingly, the expansion and contraction protrusion 140 is easily deformed toward the third surface 143 at the time of deceleration or deceleration of the tire, and is not deformed toward the fourth surface 144. Also, the expansion and contraction protrusion 140 is easily restored to the shape before the deformation as the rotational speed of the tire increases at the time of acceleration or running.

The expansion and contraction protrusion 140 may further include a deformation groove 147 formed at a lower surface at a predetermined depth from the fourth surface 144 toward the third surface 143. That is, the lower surface of the expansion and contraction protrusion 140 is formed such that a region adjacent to the third surface 143 is coupled to the tire main body 110, and a region adjacent to the fourth surface 144 is separated. The deformation groove 147 allows the expansion and contraction protrusion 140 to be easily deformed when it is deformed toward the third surface 143. In addition, the deformed groove 147 is formed in a round shape with the closed end portion 147a, thereby minimizing the occurrence of cracks due to repetitive deformation of the extending / contracting projection 140.

The extension / contraction protrusion 140 is formed of a rubber material used for a general tire, preferably a rubber material such as the tire body 110. The extensible projection 140 is preferably formed integrally with the tire body 110. The extension / contraction protrusion 140 may be separately formed and adhered to the outer circumferential surface of the tire body 110 by means such as an adhesive. At this time, the tire main body 110 has an outer circumferential surface formed with an engaging groove (not shown) having a size corresponding to the bottom surface size of the stretching protrusion 140, and the stretching protrusion 140 is inserted and adhered to the engaging groove, Can be increased.

The extensible ring 150 is formed in a ring shape having a predetermined width and thickness. The inner circumferential surface of the expansion ring (150) is coupled to the upper surface of the expansion / contraction projection (140). The stretchable ring 150 has a width at least the width of the upper surface of the stretchable protrusion 140 so that the upper surface of the stretchable and contractible protrusion 140 is exposed to the outside so as not to come into contact with the ground surface a. Further, since the stretch ring 150 is in direct contact with the paper surface a, a tread pattern (not shown) is formed on the outer circumferential surface. The tread pattern improves the braking force by increasing the frictional force between the expansion ring 150 and the ground surface (a).

The extensible ring 150 may be formed of elastic rubber like the extensible boss 140. The extensible ring 150 may be coupled to the upper surface of the extensible protrusion 140 by a separate adhesive. The expansion and contraction ring 150 may be formed integrally with the expansion and contraction protrusion 140 when the expansion and contraction protrusion 140 is formed separately from the tire body 110. That is, the extensible ring 150 may be formed integrally with the extensible projection 140.

Meanwhile, the expansion and contraction ring 150 may include another reinforcing member (not shown). The reinforcing member is formed in a wire shape, and may be formed of a metal wire or a tire cord. The stiffener may be wound in the circumferential direction within the expansion ring 150 to have a ring shape as a whole. The reinforcing material can reinforce the strength of the expansion ring 150 formed to have a relatively thin thickness.

6 and 7, the energy-saving tire 100a according to another embodiment of the present invention is further formed with the shielding plate 160 in comparison with the energy-saving tire 100 according to the first to sixth embodiments .

6 and 7, the shield plate 160 is formed in a plate shape and shields a void space formed between the extensible protrusion 140 and the extensible ring 150. [ The shield plate 160 may be formed in a ring shape and adhered to the first surfaces 141 and the second surfaces 142 of the elongating and contracting protrusions 140. The shielding plate 160 may be formed of a plurality of plates and may be adhered to the first surfaces 141 and the second surfaces 142 of the adjacent stretching protrusions 140, respectively. Since the shielding plate 160 is deformed together when the expansion and contraction protrusion 140 and the expansion and contraction ring 150 are deformed, the shield plate 160 may be formed of an elastic material such as rubber.

Hereinafter, the operation of the energy-saving tire according to the embodiment of the present invention will be described.

FIG. 8 is a cross-sectional view corresponding to FIG. 3 of a deceleration or deceleration of an energy-saving tire according to an embodiment of the present invention. FIG. Fig. 9 is a front view of the tire of Fig. 8; Fig.

Hereinafter, the case where the energy-saving tire is used as a tire of a bicycle will be mainly described.

8 and 9, the expansion and contraction protrusion 140 and the expansion and contraction ring 150 are deformed so that the outer circumference of the expansion and contraction ring 150 and the outer circumference of the fixing portion 120 are at the same time And remains in contact with the paper surface (a).

When the tire rotates, first, the tire body 110 is rotated, and a force is applied to the lower surface 146 of the expansion / contraction protrusion 140 in a direction opposite to the traveling direction of the tire. At this time, the upper surface of the expansion and contraction protrusion 140 is in a state of being fixed together with the expansion ring 150 by the frictional force with the paper surface a. Therefore, the telescopic protrusion 140 moves in a direction opposite to the traveling direction of the tire, and returns to the state before the deformation due to the force applied to the lower surface. That is, the third surface 143 and the fourth surface 144 of the expansion and contraction protrusion 140 are planar. The third surface of the expansion and contraction protrusion 140 is perpendicular to the tangential line of the outer circumferential surface of the tire body 110 and the fourth surface 144 has an acute angle with the tangential line of the outer circumferential surface of the tire body 110. The third surface of the expansion and contraction protrusion 140 coincides with a vertical line extending in the vertical direction from the center of the tire body 110 and the fourth surface 144 has an acute angle with the vertical line. Therefore, the expansion and contraction protrusion 140 is not excessively deformed in the tire advancing direction opposite to the initial deformation direction. When the tire continues to rotate, the telescopic protrusions 140 are sequentially returned to the state before the deformation, and the telescopic ring 150 is kept in a circular shape and the height of the telescopic part 130 is increased. The tire is supported while the outer circumferential surface of the expansion ring 150 is in contact with the paper surface (a), and the outer circumferential surface of the fixing portion 120 continues to rotate while being separated from the paper surface (a). Accordingly, the contact area of the tire with the ground surface (a) is reduced, and the frictional force is reduced, so that the energy required for rotating the tire is reduced.

When the tire is decelerated or braked during rotation, the elastic projections 140 are deformed in a direction opposite to the tire advancing direction while the force applied to the lower surface of the elastic projections 140 in the direction opposite to the tire advancing direction is reduced. At this time, the deformation groove 147 formed on the fourth surface 144 of the expansion and contraction protrusion 140 allows the expansion and contraction protrusion 140 to be easily deformed toward the third surface 143. The outer circumferential surface of the fixing portion 120 of the tire comes into contact with the ground surface (a) together with the outer circumferential surface of the expandable portion 130. Accordingly, the contact area of the tire with the ground surface (a) increases, so that the frictional force with the ground surface (a) increases and the stability is improved.

Next, an energy-saving tire according to another embodiment of the present invention will be described.

10 is a side view corresponding to FIG. 2 of an energy-saving tire according to another embodiment of the present invention. 11 is a cross-sectional view corresponding to FIG. 3 of an energy-saving tire according to another embodiment of the present invention. 12 is a sectional view taken along the line D-D in Fig. 13 is a sectional view taken along the line E-E in Fig.

10 to 13, the energy-saving tire 200 according to another embodiment of the present invention includes the tire main body 110, the fixing portion 120, and the stretchable and contractible portion 230.

The energy-saving tire 200 according to another embodiment of the present invention is different from the energy-saving tire 100 according to the first to ninth embodiments in the structure of the expansion part 230. Accordingly, the energy-saving tire 200 according to another embodiment of the present invention will be described with reference to a configuration in which the expandable portion 230 is different. The energy-saving tire 200 uses the same reference numerals as those of the energy-saving tire 100 shown in FIGS. 1 to 9, and a detailed description thereof will be omitted.

The stretchable and contractible portion 230 is formed to include a stretchable protrusion 240 and an extensible ring 250.

The expansion and contraction ring 250 is formed in a ring shape extending in the circumferential direction from the outer circumferential surface of the tire main body in the outward direction. That is, the extensible ring 250 is formed so that the inner circumferential surface thereof is in contact with the outer circumferential surface of the tire body, and the outer circumferential surface thereof is directed to the outside of the tire. The extensible ring 250 is formed with a predetermined width at the center in the width direction on the outer circumferential surface of the tire body. The extension ring 250 is formed between the fixing rings 120a of the fixing portion 120 and has a height greater than the height of the fixing portion 120. [

The extensible ring 250 is formed of a rubber material used for a general tire, preferably a rubber material such as the tire body 110. The extensible ring 250 is preferably formed integrally with the tire body 110.

The extensible ring 250 is formed to extend outward from the outer circumferential surface of the tire main body 110 so that the inner circumferential surface is in contact with the outer circumferential surface of the tire main body 110 as compared with the extensible ring 130 according to the embodiment of the present invention, So that there is a difference.

The extension and retraction protrusions 240 are formed in a quadrangular pyramid shape and are arranged along the circumferential direction on the outer peripheral surface of the tire main body 110. Meanwhile, in the structure having a quadrangular pyramid shape, the expansion and contraction protrusion 240 has the same structure as the expansion and contraction protrusion 140 according to an embodiment of the present invention. That is, the expansion and contraction protrusion 240 is perpendicular to the first surface 241, the second surface 242, and the first surface 241 facing the same direction as the outer surface of the tire main body 110, A third surface 243 which faces the direction opposite to the traveling direction of the tire when the projection 240 is close to the paper surface a and a fourth surface 244 which is the opposite surface of the third surface 243, do. The extension and retraction protrusions 240 are formed with an upper surface 245 and a lower surface 246. The expansion and contraction protrusion 240 may further include a deformation groove 147 formed in the lower surface 246 at a predetermined depth from the fourth surface 244 toward the third surface 243. However, the deforming groove 147 may be omitted for easy molding.

The extension and retraction protrusions 240 may be disposed at predetermined intervals along the outer circumferential surface of the tire body 110, or may be disposed so as to be in contact with each other. The expansion and contraction protrusion 240 is formed between both sides of the expansion ring 250 and the fixed ring 120a and the first face 214 or the second face 242 is formed on both sides of the expansion ring 250 . At this time, the expansion and contraction protrusion 240 is formed to have a smaller width than the width between the expansion ring 120a and the expansion and contraction ring 250. As shown in FIGS. 12 and 13, the extension and retraction protrusions 240 may be formed so that both sides thereof are symmetrically arranged with respect to the expansion ring 250, or may be arranged to be staggered from each other. In addition, the expansion and contraction protrusion 240 is formed at the same height or lower height as the expansion ring 250. In addition, the extension and retraction protrusions 240 are formed at a height higher than the height of the stationary ring 120a. Accordingly, the upper surface 245 of the expansion and contraction protrusion 240 is exposed to contact with the ground surface together with the expansion ring 250 when the tire is rotated or braked, thereby causing friction.

The extension / contraction protrusion 240 is formed of a rubber material used for a general tire, and preferably a rubber material such as a tire body 110. The extension and retraction protrusions 240 are preferably formed integrally with the tire main body 110 and the extensible ring 250. Therefore, the stretchable and contractible protrusions 240 are supported by the stretchable ring 250 at the time of friction with the ground, so that the stretchable protrusions 240 are minimally deformed or damaged during contact with the ground.

The expansion and contraction protrusion 240 is different from the expansion and contraction protrusion 140 according to the embodiment of the present invention in that the elastic protrusion 240 is formed on both sides of the expansion ring 250 and the outer circumference is formed to be in contact with the ground surface . In addition, the extension and retraction protrusions 240 may be arranged so as to be in contact with each other when arranged along the circumferential direction.

The energy-saving tire 200 according to another embodiment of the present invention is formed such that the outer circumferential surface of the expansion and contraction protrusion 240 is exposed in the outer direction of the tire, and the molding process is relatively easy. Since the elastic protrusions 240 are integrally formed with the elastic ring 250, the energy-saving tire 200 is minimized in that the elastic elastic ring 240 is supported by the elastic ring 250 to be damaged during use, There is an increasing aspect.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is.

100, 100a, 200: Energy-saving tire
110: Tire body
120: fixing part 130, 230: stretching part
140, 240: extensible projection 150, 250: extensible ring
160: shield plate

Claims (9)

delete A tire main body formed in a ring shape,
And two ring-shaped retaining rings spaced apart from each other with respect to the width direction on the outer circumferential surface of the tire main body, wherein the retaining portion is configured such that the outer circumferential surface of the ring-
And the height of the outer circumferential surface is formed to be higher than the outer circumferential surface of the fixing portion
And a stretchable portion in which the height is reduced while being deformed at a portion contacting with the ground at the time of deceleration or deceleration and the height is increased before deformation at the time of acceleration or running,
The stretching /
A pair of elastic protrusions which are formed in a quadrangular pyramid shape having an upper surface and a lower surface and in which the lower surface is in contact with the outer circumferential surface of the tire body and a plurality of which are spaced apart from each other between the stationary rings and the outer circumferential surface of the tire body;
And a stretch ring which is formed in a ring shape and has a width at least at the width of the upper surface of the stretchable projections and whose inner circumferential surface is in contact with the upper surface of the stretchable projections. 3. The method of claim 2,
Which is parallel to the side surface of the tire main body and is opposed to each other, a first surface and a second surface which are perpendicular to the first surface and which are opposite to the traveling direction of the tire when the telescopic projection is close to the ground surface, A third surface and a fourth surface that is an opposite surface of the third surface,
Wherein the third surface is formed to be perpendicular to the tangential surface of the outer circumferential surface of the tire body at a position where the third surface contacts the tire body,
Wherein the fourth surface is inclined to the third surface with respect to a surface perpendicular to the tangential surface of the outer circumferential surface of the tire main body. The method of claim 3,
Wherein the expansion and contraction protrusion further comprises a deformation groove formed in a direction from the fourth surface to the third surface at a lower surface thereof and rounded at an end thereof. 3. The method of claim 2,
Wherein the extension / contraction projection is formed integrally with the tire main body. 3. The method of claim 2,
Wherein the expansion / contraction portion is formed in a plate-like shape, and further comprises a shielding plate shielding a space formed between the expansion / contraction rim and the expansion ring. A tire main body formed in a ring shape,
And two ring-shaped retaining rings spaced apart from each other with respect to the width direction on the outer circumferential surface of the tire main body, wherein the retaining portion is configured such that the outer circumferential surface of the ring-
And the height of the outer circumferential surface is formed to be higher than the outer circumferential surface of the fixing portion
And a stretchable portion in which the height is reduced while being deformed at a portion contacting with the ground at the time of deceleration or deceleration and the height is increased before deformation at the time of acceleration or running,
The stretching /
A stretch ring extending in the circumferential direction from the center in the width direction of the outer circumferential surface of the tire main body in the circumferential direction and formed in a ring shape having a height higher than that of the stationary ring and a predetermined width,
The tire according to any one of claims 1 to 3, wherein the first and second surfaces of the tire main body are arranged in a circumferential direction on the outer circumferential surface of the tire main body and are arranged on both sides of the stretch ring and facing the same direction as the outer surface of the tire main body, And an expansion / contraction protrusion formed on one of the two sides of the expansion / contraction ring so as to contact both sides of the expansion / contraction ring. 8. The method of claim 7,
Wherein the expansion and contraction ridge is formed at a height equal to or smaller than the height of the expansion ring and formed at a height higher than the height of the fixing ring and arranged to be symmetrical on both sides of the expansion ring, Economy tires. 8. The method of claim 7,
Wherein the expansion and contraction projection and the expansion and contraction ring are integrally formed with the tire main body.

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