Tire

Abstract

The invention provides a tire which comprises a tire bead, the tire bead is provided with a first tire bead outer side face, a tire bead outer bottom face and a second tire bead outer side face which are connected with one another, the projection of the tire bead outer bottom face on a preset projection plane is a first projection line, and the projection of the first tire bead outer side face on the preset projection plane is a second projection line; the first projection line comprises a first line segment, a second line segment and a third line segment which are arranged in sequence, an intersection point between an extension line of the second projection line and an extension line of the second line segment is a first reference point, and an intersection point between the first line segment and the second line segment is a first connection point; in the horizontal axial direction of the tire, the distance between one end, far away from the second line segment, of the third line segment and the first reference point is W, the distance between the first reference point and the first connecting point is W2, and W2 is equal to 25%-30% W. The tire solves the problem that a tire in the prior art cannot give consideration to sufficient contact pressure between the tire and a rim and cannot be installed in place at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of tires, and in particular to a tire. Background Art

[0002] Insufficient bonding between the tire and the rim will result in incomplete contact between the rim and the tire, which will cause the tire to slip relative to the rim; excessive bonding between the tire and the rim will result in the tire and the rim being too tight, causing the tire to be improperly installed and abnormally stressed, and a gap between the side of the tire bead and the rim, which can easily cause damage to the tire.

[0003] Generally, the tire bead has a toe boss, and the heel of the tire has an arc with a small radius, so that the space near the heel of the tire is smaller than the space near the toe of the tire. When the contact pressure between the tire and the rim is sufficient and the bottom of the tire bead is fully in contact and squeezed with the rim, the rubber at the tire bead can only move toward the direction of the tire toe, resulting in a gap between the side of the tire bead and the rim, which makes it easy for the tire to be improperly installed. Summary of the invention

[0004] The main purpose of the present invention is to provide a tire to solve the problem that the tire in the prior art cannot simultaneously take into account sufficient contact pressure between the tire and the rim and the tire being installed in place.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a tire, comprising: a bead, the bead having a first bead outer side surface, a bead outer bottom surface and a second bead outer side surface which are connected to each other, the first bead outer side surface and the bead outer bottom surface are both used to contact the rim, the projection of the bead outer bottom surface on the preset projection surface is a first projection line, and the projection of the first bead outer side surface on the preset projection surface is a second projection line; from the tire heel to the tire toe direction, the first projection line includes a first line segment, a second line segment and a third line segment which are arranged in sequence, the intersection point between the extension line of the second projection line and the extension line of the second line segment is a first reference point, and the intersection point between the first line segment and the second line segment is a first connection point; along the horizontal axial direction of the tire, the distance between the end of the third line segment away from the second line segment and the first reference point is W, the distance between the first reference point and the first connection point is W2, and W2=25%~30%W; wherein, the extension direction of the preset projection surface is parallel to the extension direction of the horizontal axis of the tire, and the preset projection surface is perpendicular to the circumferential surface of the tire.

[0006] Further, the first line segment includes a first sub-line segment, a second sub-line segment and a third sub-line segment which are arranged in sequence, the first sub-line segment is arranged away from the second line segment relative to the third sub-line segment, the first sub-line segment and the third sub-line segment are both arc segments, the second sub-line segment is a straight line segment, and the intersection between the extension line of the second line segment and the extension line of the second sub-line segment is the second reference point; along the horizontal axial direction of the tire, the distance between the first reference point and the second reference point is W6, W6=20%~25%W.

[0007] Further, the first sub-line segment, the second sub-line segment and the third sub-line segment are all arc segments, and the inner diameter of the first sub-line segment, the inner diameter of the second sub-line segment and the inner diameter of the third sub-line segment are the same.

[0008] Furthermore, the first sub-line segment, the second sub-line segment and the third sub-line segment are all straight line segments, and an extension direction of the first sub-line segment, an extension direction of the second sub-line segment and an extension direction of the third sub-line segment are parallel.

[0009] Furthermore, a wire ring is arranged inside the tire bead, and the tire bead also has an inner side surface of the tire bead. Along the vertical axial direction of the tire, the inner side surface of the tire bead is arranged close to the wire ring relative to the outer side surface of the tire bead. The projection of the inner side surface of the tire bead on the preset projection plane is the third projection line, and the projection of the center of the wire ring on the preset projection plane is the third reference point. The shortest distance between the third reference point and the third projection line is R1. When the first sub-segment of the first line segment is an arc segment, the radius of the first sub-segment is R; wherein, R=R1.

[0010] Furthermore, the value range of the angle θ1 between the third line segment and the second line segment is: 172°≤θ1≤178°.

[0011] Furthermore, along the horizontal axial direction of the tire, the length of the third line segment is W1, where W1=30%-40%W.

[0012] Furthermore, the intersection of the extension line of the second projection line and the extension line of the first sub-segment is the fourth reference point, and along the vertical axis direction of the tire, the distance between the fourth reference point and the first reference point is W3, W3 = W2 + (5-15) mm.

[0013] Furthermore, the extension direction of the third line segment is parallel to the extension direction of the horizontal axis of the tire, the projection of the center of the tire on the preset projection plane is the sixth reference point, the bottom surface of the rim is in contact with the outer bottom surface of the tire bead, and along the vertical axial direction of the tire, the distance between the sixth reference point and the third line segment is D1, and the distance between the sixth reference point and the bottom surface of the rim is Dri, D1<Dri.

[0014] Furthermore, the Shore hardness of the tire rubber is 74.

[0015] According to the technical solution of the present invention, a tire includes a bead, wherein the bead has a first bead outer side surface, a bead outer bottom surface, and a second bead outer side surface connected to each other, the projection of the bead outer bottom surface on a preset projection surface is a first projection line, and the projection of the first bead outer side surface on the preset projection surface is a second projection line; in a direction from a heel to a toe of the tire, the first projection line includes a first line segment, a second line segment, and a third line segment arranged in sequence, the intersection point between an extension line of the second projection line and an extension line of the second line segment is a first reference point, and the intersection point between the first line segment and the second line segment is a first connection point; along the horizontal axial direction of the tire, the third line segment away from the first line segment is a first connection point. The distance between one end of the second line segment and the first reference point is W, and the distance between the first reference point and the first connection point is W2; by setting W2=25%~30%W, the bead heel arc is increased, so that there is space for accommodating rubber at the bead heel position, so that when the contact pressure between the tire and the rim is sufficient and the bottom of the bead is fully in contact and squeezed with the rim, the rubber at the bead can move toward the bead toe and the bead heel at the same time, avoiding a gap between the side of the bead and the rim, thereby ensuring that the tire is installed in place, thereby solving the problem in the prior art that the tire cannot simultaneously take into account sufficient contact pressure between the tire and the rim and that the tire is installed in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of an embodiment of a tire according to the present invention (the first sub-line segment and the third sub-line segment are both arc segments, and the second sub-line segment is a straight line segment) is shown;

[0018] Figure 2 A schematic structural diagram of an embodiment of a tire according to the present invention (the first sub-line segment, the second sub-line segment and the third sub-line segment are all arc segments) is shown;

[0019] Figure 3 A schematic structural diagram of an embodiment of a tire according to the present invention (the first sub-line segment, the second sub-line segment and the third sub-line segment are all straight line segments);

[0020] Figure 4 A schematic structural diagram of an embodiment of a tire according to the present invention is shown.

[0021] The above drawings include the following reference numerals:

[0022] 1. Rim; 11. First bead outer side surface; 12. Bead outer bottom surface; 13. Second bead outer side surface; 14. First projection line; 15. Second projection line; 16. First reference point; 17. First connection point; 18. First line segment; 19. Second line segment; 110. Third line segment; 21. First sub-line segment; 22. Second sub-line segment; 23. Third sub-line segment; 24. Second reference point; 51. Wire ring; 53. Third projection line; 54. Third reference point; 81. Fourth reference point; 82. Rim bottom surface; 811. Eighth reference point. DETAILED DESCRIPTION

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0025] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0026] Please refer to Figures 1 to 4The present invention provides a tire, comprising: a bead, the bead having a first bead outer side surface 11, a bead outer bottom surface 12 and a second bead outer side surface 13 connected to each other, the first bead outer side surface 11 and the bead outer bottom surface 12 are both used to contact with a rim 1, the projection of the bead outer bottom surface 12 on a preset projection surface is a first projection line 14, and the projection of the first bead outer side surface 11 on the preset projection surface is a second projection line 15; from the tire bead heel to the bead toe direction, the first projection line 14 includes a first line segment 18, a second line segment 19 and a third line segment 110 arranged in sequence, and the second The intersection of the extension line of the projection line 15 and the extension line of the second line segment 19 is the first reference point 16, and the intersection of the first line segment 18 and the second line segment 19 is the first connection point 17; along the horizontal axial direction of the tire, the distance between the end of the third line segment 110 away from the second line segment 19 and the first reference point 16 is W, and the distance between the first reference point 16 and the first connection point 17 is W2, W2=25%~30%W; wherein, the extension direction of the preset projection plane is parallel to the extension direction of the horizontal axis of the tire, and the preset projection plane is perpendicular to the circumferential surface of the tire.

[0027] The tire of the present invention comprises a bead, wherein the bead has a first bead outer side surface 11, a bead outer bottom surface 12 and a second bead outer side surface 13 connected to each other, the projection of the bead outer bottom surface 12 on a preset projection surface is a first projection line 14, and the projection of the first bead outer side surface 11 on the preset projection surface is a second projection line 15; in the direction from the tire heel to the tire toe, the first projection line 14 comprises a first line segment 18, a second line segment 19 and a third line segment 110 arranged in sequence, the intersection point between the extension line of the second projection line 15 and the extension line of the second line segment 19 is a first reference point 16, and the intersection point between the first line segment 18 and the second line segment 19 is a first connection point 17; along the horizontal axial direction of the tire, The distance between the end of the third line segment 110 away from the second line segment 19 and the first reference point 16 is W, and the distance between the first reference point 16 and the first connection point 17 is W2; by setting W2=25%~30%W, the bead heel arc is increased, so that there is space for accommodating rubber at the bead heel position, so that when the contact pressure between the tire and the rim is sufficient and the bottom of the bead is fully in contact and squeezed with the rim, the rubber at the bead can move toward the bead toe and the bead heel at the same time, avoiding the existence of a gap between the side of the bead and the rim, thereby ensuring that the tire is installed in place, thereby solving the problem in the prior art that the tire cannot simultaneously take into account sufficient contact pressure between the tire and the rim and the tire being installed in place.

[0028] In this embodiment, the first line segment 18 includes a first sub-line segment 21, a second sub-line segment 22 and a third sub-line segment 23 which are arranged in sequence. The first sub-line segment 21 is arranged away from the second line segment 19 relative to the third sub-line segment 23. The first sub-line segment 21 and the third sub-line segment 23 are both arc segments, the second sub-line segment 22 is a straight line segment, and the intersection between the extension line of the second line segment 19 and the extension line of the second sub-line segment 22 is the second reference point 24. Along the horizontal axial direction of the tire, the distance between the first reference point 16 and the second reference point 24 is W6, and W6=20%~25%W.

[0029] Specifically, such a setting can avoid the situation where the arc of the bead is too small due to W6 being too small, thus preventing the tire from being improperly installed. It can also avoid the situation where W6 is too large, causing the rubber at the bottom of the bead to move to the gap between the bead and the rim. Although this can ensure that the tire is installed in place, it will cause the contact pressure between the tire and the rim to become smaller, which can easily cause the tire to slip relative to the rim.

[0030] In this embodiment, the first sub-segment 21 , the second sub-segment 22 and the third sub-segment 23 are all arc segments, and the inner diameters of the first sub-segment 21 , the second sub-segment 22 and the third sub-segment 23 are the same.

[0031] Specifically, such a setting can avoid the situation where the arc of the bead is too small due to W2 being too small, thus preventing the tire from being improperly installed. It can also avoid the situation where W2 is too large, causing the rubber at the bottom of the bead to move to the gap between the bead and the rim. Although this can ensure that the tire is installed in place, it will cause the contact pressure between the tire and the rim to become smaller, which can easily cause the tire to slip relative to the rim.

[0032] In this embodiment, the first sub-segment 21 , the second sub-segment 22 and the third sub-segment 23 are all straight line segments, and the extension directions of the first sub-segment 21 , the second sub-segment 22 and the third sub-segment 23 are parallel.

[0033] Specifically, such a setting can avoid the situation where the arc of the bead is too small due to W2 being too small, thus preventing the tire from being improperly installed. It can also avoid the situation where W2 is too large, causing the rubber at the bottom of the bead to move to the gap between the bead and the rim. Although this can ensure that the tire is installed in place, it will cause the contact pressure between the tire and the rim to become smaller, which can easily cause the tire to slip relative to the rim.

[0034] In this embodiment, a wire ring 51 is arranged inside the tire bead, and the tire bead also has an inner side surface of the tire bead. Along the vertical axial direction of the tire, the inner side surface of the tire bead is arranged close to the wire ring 51 relative to the outer side surface of the tire bead. The projection of the inner side surface of the tire bead on the preset projection plane is the third projection line 53, and the projection of the center of the wire ring 51 on the preset projection plane is the third reference point 54. The shortest distance between the third reference point 54 and the third projection line 53 is R1. When the first sub-segment 21 of the first line segment 18 is an arc segment, the radius of the first sub-segment 21 is R; wherein, R=R1.

[0035] Specifically, such an arrangement can avoid a smaller bead heel arc due to a smaller radius of the first sub-segment 21, thereby ensuring that there is space at the bead heel position for accommodating rubber, so that when the bottom of the bead is in full contact and extrusion with the rim, the rubber at the bead can move toward the bead toe and the bead heel at the same time.

[0036] In this embodiment, the value range of the angle θ1 between the third line segment 110 and the second line segment 19 is: 172°≤θ1≤178°.

[0037] Specifically, such an arrangement can avoid the presence of more space for accommodating rubber at the bead toe position, and avoid the rubber at the bead only moving toward the bead toe direction when the bead bottom is in full contact and compression with the rim, resulting in improper installation of the tire.

[0038] In this embodiment, along the horizontal axial direction of the tire, the length of the third line segment 110 is W1, where W1=30%-40%W.

[0039] Specifically, such an arrangement can avoid the presence of more space for accommodating rubber at the bead toe position, and avoid the rubber at the bead only moving toward the bead toe direction when the bead bottom is in full contact and compression with the rim, resulting in improper installation of the tire.

[0040] In this embodiment, the intersection of the extension line of the second projection line 15 and the extension line of the first sub-line segment 21 is the fourth reference point 81. Along the vertical axis direction of the tire, the distance between the fourth reference point 81 and the first reference point 16 is W3, W3 = W2 + (5 ~ 15) mm. The intersection of the extension line of the second projection line 15 and the extension line of the second sub-line segment 22 is the eighth reference point 811. Along the vertical axis direction of the tire, the distance between the eighth reference point 811 and the first reference point 16 is W7, W7 = W6 + (5 ~ 15) mm.

[0041] Specifically, such an arrangement can prevent a gap from still existing between the side of the tire bead and the rim after the rubber material at the tire bead moves toward the tire toe and the tire heel at the same time, thereby preventing the tire from being improperly installed.

[0042] In this embodiment, the extension direction of the third line segment 110 is parallel to the extension direction of the horizontal axis of the tire, the projection of the center of the tire on the preset projection plane is the sixth reference point, the bottom surface of the rim 82 is in contact with the outer bottom surface of the tire bead, and along the vertical axial direction of the tire, the distance between the sixth reference point and the third line segment 110 is D1, and the distance between the sixth reference point and the bottom surface of the rim 82 is Dri, D1<Dri.

[0043] Specifically, by setting D1<Dri, the tire of the present invention can play a role of sealing and inflation by reducing the inner diameter of the tire at the bead position when the bead is eliminated, thereby avoiding air leakage when the tire is inflated after the bead is installed on the rim 1.

[0044] In this embodiment, the Shore hardness of the tire rubber is 74.

[0045] Specifically, if the rubber is too soft, the degree of reinforcement to the rim is weak, which easily causes the tire to slip relative to the rim 1. If the rubber is too hard, the adhesion of the tire is too small, and the contact between the tire and the rim is too loose, which easily causes the tire to slip relative to the rim 1. By setting the Shore hardness of the rubber of the tire to 74, the tire can be prevented from slipping relative to the rim 1, ensuring that the tire of the present invention takes into account the problem of sufficient contact pressure between the tire and the rim and the tire being installed in place.

[0046] Specifically, the compression rate is usually calculated as: H1 / (H2-d), H1 is the compression of the tire, H2 is the total thickness of the bead bottom, and d is the wire diameter; the compression rate is usually set to 30%∽35%, because a higher compression rate may face the risk of not being installed in place. Although the tire of the present application increases the compression of the bead bottom and the compression rate of the tire, by increasing the bead heel arc and limiting the Shore hardness of the tire's rubber, the tire of the present application overcomes the problem of not being able to be installed in place when the bead compression rate is large, so that the tire of the present application takes into account both the sufficient contact pressure between the tire and the rim and the problem of the tire being installed in place.

[0047] Specifically, when the Shore hardness of the tire's rubber is 74, W1=30%~40%W, W6=20%~25%W, and W7=W6+(5~15)mm, the contact pressure between the tire and the rim is the largest, indicating that at this time the tire can best take into account both the sufficient contact pressure between the tire and the rim and the problem of the tire being installed in place.

[0048] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0049] The tire of the present invention comprises a bead, wherein the bead has a first bead outer side surface 11, a bead outer bottom surface 12 and a second bead outer side surface 13 connected to each other, the projection of the bead outer bottom surface 12 on a preset projection surface is a first projection line 14, and the projection of the first bead outer side surface 11 on the preset projection surface is a second projection line 15; in the direction from the tire heel to the tire toe, the first projection line 14 comprises a first line segment 18, a second line segment 19 and a third line segment 110 arranged in sequence, the intersection point between the extension line of the second projection line 15 and the extension line of the second line segment 19 is a first reference point 16, and the intersection point between the first line segment 18 and the second line segment 19 is a first connection point 17; along the horizontal axial direction of the tire, The distance between the end of the third line segment 110 away from the second line segment 19 and the first reference point 16 is W, and the distance between the first reference point 16 and the first connection point 17 is W2; by setting W2=25%~30%W, the bead heel arc is increased, so that there is space for accommodating rubber at the bead heel position, so that when the contact pressure between the tire and the rim is sufficient and the bottom of the bead is fully in contact and squeezed with the rim, the rubber at the bead can move toward the bead toe and the bead heel at the same time, avoiding the existence of a gap between the side of the bead and the rim, thereby ensuring that the tire is installed in place, thereby solving the problem in the prior art that the tire cannot simultaneously take into account sufficient contact pressure between the tire and the rim and the tire being installed in place.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tire, characterized in that: include: A bead, the bead comprising a first bead outer side surface (11), a bead outer bottom surface (12) and a second bead outer side surface (13) which are connected to each other, the first bead outer side surface (11) and the bead outer bottom surface (12) are both used to contact the rim (1), the projection of the bead outer bottom surface (12) on a preset projection surface is a first projection line (14), and the projection of the first bead outer side surface (11) on the preset projection surface is a second projection line (15); In a direction from the heel to the toe of the tire, the first projection line (14) comprises a first line segment (18), a second line segment (19) and a third line segment (110) which are arranged in sequence, an intersection point between an extension line of the second projection line (15) and an extension line of the second line segment (19) is a first reference point (16), and an intersection point between the first line segment (18) and the second line segment (19) is a first connection point (17); Along the horizontal axial direction of the tire, the distance between the end of the third line segment (110) away from the second line segment (19) and the first reference point (16) is W, and the distance between the first reference point (16) and the first connection point (17) is W2, W2=25%~30%W; wherein the extension direction of the preset projection plane is parallel to the extension direction of the horizontal axis of the tire, and the preset projection plane is perpendicular to the circumferential surface of the tire.

2. The tire according to claim 1, characterized in that The first line segment (18) comprises a first sub-line segment (21), a second sub-line segment (22) and a third sub-line segment (23) which are arranged in sequence; the first sub-line segment (21) is arranged away from the second line segment (19) relative to the third sub-line segment (23); the first sub-line segment (21) and the third sub-line segment (23) are both arc segments; the second sub-line segment (22) is a straight line segment; the intersection of an extension line of the second line segment (19) and an extension line of the second sub-line segment (22) is a second reference point (24); along the horizontal axial direction of the tire, the distance between the first reference point (16) and the second reference point (24) is W6, W6=20%~25%W.

3. The tire according to claim 1, characterized in that The first sub-line segment (21), the second sub-line segment (22) and the third sub-line segment (23) are all arc segments, and the inner diameter of the first sub-line segment (21), the inner diameter of the second sub-line segment (22) and the inner diameter of the third sub-line segment (23) are the same.

4. The tire according to claim 1, characterized in that The first sub-line segment (21), the second sub-line segment (22) and the third sub-line segment (23) are all straight line segments, and the extension direction of the first sub-line segment (21), the extension direction of the second sub-line segment (22) and the extension direction of the third sub-line segment (23) are parallel.

5. The tire according to claim 1, characterized in that A wire ring (51) is arranged inside the tire bead, and the tire bead also has an inner side surface of the tire bead. Along the vertical axial direction of the tire, the inner side surface of the tire bead is arranged close to the wire ring (51) relative to the outer side surface of the tire bead. The projection of the inner side surface of the tire bead on the preset projection plane is a third projection line (53). The projection of the center of the wire ring (51) on the preset projection plane is a third reference point (54). The shortest distance between the third reference point (54) and the third projection line (53) is R1. When the first sub-segment (21) of the first line segment (18) is an arc segment, the radius of the first sub-segment (21) is R; wherein R=R1.

6. The tire according to claim 1, characterized in that The value range of the angle θ1 between the third line segment (110) and the second line segment (19) is: 172°≤θ1≤178°.

7. The tire according to claim 1, characterized in that Along the horizontal axial direction of the tire, the length of the third line segment (110) is W1, where W1=30%-40%W.

8. The tire according to claim 1, characterized in that The intersection point between the extension line of the second projection line (15) and the extension line of the first sub-line segment (21) is a fourth reference point (81), and along the vertical axis direction of the tire, the distance between the fourth reference point (81) and the first reference point (16) is W3, W3 = W2 + (5 to 15) mm.

9. The tire according to claim 1, characterized in that The extension direction of the third line segment (110) is parallel to the extension direction of the horizontal axis of the tire, the projection of the center of the tire on the preset projection plane is the sixth reference point, the rim bottom surface (82) is in contact with the outer bottom surface of the tire bead, and along the vertical axial direction of the tire, the distance between the sixth reference point and the third line segment (110) is D1, and the distance between the sixth reference point and the rim bottom surface (82) is Dri, and D1<Dri.

10. The tire according to claim 1, characterized in that The Shore hardness of the rubber of the tire is 74.

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