CN217455538U - Pneumatic tire - Google Patents

Abstract

The utility model provides a pneumatic tire capable of generating new visual effect. The pneumatic tire is provided with a decorative region (11) on a side surface (10), and the decorative region (11) is provided with a 1 st reference surface (21) and a plurality of protrusions (30) protruding from the 1 st reference surface (21), wherein the protrusions (30) have: a ridge (31) extending along the 1 st direction; and inclined surfaces (32) which are inclined and spread from the ridge line (31) to the 1 st reference surface (21) with respect to the 1 st reference surface (21) on both sides in the 2 nd direction with the ridge line (31) as the center, wherein the length of the ridge line (31) is shorter than the length of the protrusions (30) in the 2 nd direction, a plurality of protrusion rows (23) are formed, the protrusion rows are formed by contacting and connecting the plurality of protrusions (30) in the 2 nd direction, and the positions of the protrusions (30) in the adjacent protrusion rows (23) are shifted in the 2 nd direction.

Description

Pneumatic tire

This application is based on Japanese laid-open application 2021-170756 (application date: 10/19/2021), and the priority of this Japanese laid-open application 2021-170756 is claimed. The present application includes the entire contents of Japanese laid-open application 2021-170756.

Technical Field

The utility model relates to a pneumatic tire.

Background

For example, as described in patent document 1, a pneumatic tire having a pattern provided on a sidewall surface is known. In many conventional patterns, a plurality of ridges extending linearly are arranged at equal intervals. Such a pattern can improve the design of the sidewall surface.

Patent document 1: japanese patent laid-open publication No. 2003-175707

SUMMERY OF THE UTILITY MODEL

However, although beautiful patterns have been frequently proposed, patterns having epoch-making significance that produce unprecedented visual effects have not been proposed so much.

Therefore, an object of the present invention is to provide: a pneumatic tire capable of producing a new visual effect.

A pneumatic tire of an embodiment is a pneumatic tire provided with a decorative region on a sidewall surface, the decorative region being provided with a 1 st reference surface and a plurality of projections projecting from the 1 st reference surface, the pneumatic tire being characterized in that the projections have: a ridge extending along the 1 st direction; and inclined surfaces which are inclined and spread from the ridge line to the 1 st reference surface with respect to the 1 st reference surface on both sides in the 2 nd direction with the ridge line as a center, wherein the ridge line has a length shorter than a length of the protrusion in the 2 nd direction, and a plurality of protrusion rows are formed, the protrusion rows are formed by contacting and connecting the plurality of protrusions in the 2 nd direction, and positions of the protrusions in the adjacent protrusion rows are shifted in the 2 nd direction.

According to the pneumatic tire of the embodiment, a new visual effect is produced by reflection of light at a plurality of the inclined surfaces.

Drawings

Fig. 1 is an axial half-sectional view of a pneumatic tire.

Fig. 2 is a view of the decorative region of the tire side surface as viewed from the tire axial direction.

Fig. 3 is a perspective view of a portion of the pattern.

Fig. 4 is a tire circumferential direction sectional view of the pattern.

Fig. 5 is a view of the pattern as viewed from a direction perpendicular to the 1 st reference plane.

Fig. 6 is a perspective view of a projection according to a modification. An illustration showing that the heights of both ends of the ridge are different.

Fig. 7 is a cross-sectional view in the tire circumferential direction of a modified pattern. An illustration showing that the ridge of the protrusion is lower than the 2 nd reference surface.

Fig. 8 is a cross-sectional view in the tire circumferential direction of a modified pattern. An illustration showing the 1 st reference plane higher than the 2 nd reference plane.

Description of the reference numerals

A C … centerline; 1 … pneumatic tire; 2 … carcass ply; 2a … fold-back portion; 2b … curled end; 3 … rubber chafer; 4 … belt layer; 5 … belt reinforcement; 6 … tread band; 7 … sidewall rubber; 8 … rim line; 9 … bead portion; 10 … sidewall faces; 11 … decorative area; 12 … inner diameter side wire; 13 … outside diameter side wire; 14 … pattern; 15 … mark; 16 … letters; 17 … profile; 21 … reference plane 1; 22 … reference plane 2; 23 … rows of protrusions; a 30 … projection; 31 … ridge; a 32 … ramp; 33 … side; 34 … directional end 2; 35 … intersection; 36 … intersection; 130 … projection; 131 … ridge; end 131a …; end 131b …; 132 ….

Detailed Description

Fig. 1 shows a cross-sectional structure of a pneumatic tire 1 of the embodiment. Fig. 1 shows only half of the tire axial direction, and the actual pneumatic tire 1 is substantially symmetrical to the center line C. Note that arrow a in fig. 1 indicates the tire axial direction, and arrow B in fig. 1 and 2 indicates the tire radial direction.

In the pneumatic tire 1, bead portions 9 are provided on both sides in the tire axial direction. The bead portion 9 includes: the bead core is composed of steel wires wound in a circular shape, and a rubber bead filler is arranged on the radial outer side of the bead core.

The 1 or 2 carcass plies 2 are arranged on the bead portions 9 on both sides in the axial direction of the tire. The carcass cord 2 is a sheet-like member in which a plurality of cord cords arranged in a direction orthogonal to the tire circumferential direction are covered with rubber. The carcass cord 2 forms a skeleton shape of the pneumatic tire 1 between the bead portions 9 on both sides in the tire axial direction, and the carcass cord 2 is folded back and turned around the bead portions 9 from the inner side toward the outer side in the tire axial direction to wrap the bead portions 9. Further, a rubber chafer 3 is provided at a position outside the turn-up portion 2a of the carcass ply 2 in the tire axial direction.

Further, 1 or more belt layers 4 are provided on the outer side of the carcass ply 2 in the tire radial direction, and a belt reinforcing layer 5 is provided on the outer side of the belt layers 4 in the tire radial direction. The belt 4 is a member in which a plurality of steel cords are covered with rubber. The belt reinforcing layer 5 is a member in which a plurality of cords made of organic fiber are coated with rubber. A tread rubber 6 is provided on the outer side of the belt reinforcing layer 5 in the tire radial direction. The tread rubber 6 is provided with a plurality of grooves to form a tread pattern.

Further, sidewall rubbers 7 are provided on both sides of the carcass ply 2 in the tire axial direction. The tread rubber 6 and the side rubber 7 are overlapped on the support portion (buttons), but either one of the tread rubber 6 and the side rubber 7 may be overlapped on the tire surface side. The portion of the sidewall rubber 7 on the inner side in the tire radial direction extends to a position close to the bead portion 9, and wraps a portion of the rubber chafer 3.

A rim line 8, which is a small protrusion having a height of about 1mm, is formed on the boundary on the tire surface between the side rubber 7 and the rubber chafer 3. The rim line 8 is wound around 1 circumference in the tire circumferential direction. In addition, instead of the rim line 8, at the same position as the rim line 8, there may be provided: a rim protector having a substantially triangular cross section. In the tire radial direction, a range from the rim line 8 or the rim protector to the tread end is defined as a tire side surface 10. Here, the tread end means: the tire axial direction end of the ground contact surface of the tread rubber 6 when the pneumatic tire 1 is in contact with a road surface.

Further, on the inner side of the carcass ply 2, there are adhered: a sheet-like inner liner made of rubber having low air permeability. In addition to these components, a belt under-liner, chafer (chafer), and the like are provided as necessary for the tire function.

As shown in fig. 1 and 2, a decorative region 11 is provided on at least one of the sidewall surfaces 10 on both sides in the tire axial direction. The decorative region 11 is a circular ring shape centered on the tire rotation axis. The decorative region 11 is a region having a constant width and sandwiched between an inner diameter side line 12 of a small-diameter circular shape and an outer diameter side line 13 of a large-diameter circular shape. The inner diameter side line 12 and the outer diameter side line 13 may be lines formed on the tire surface by utilizing a concave, convex or step difference, or may be virtual lines which do not exist in reality.

The decorative region 11 may be located in the tire radial direction: the portion located further outward in the tire radial direction than the position of the maximum width of the pneumatic tire 1 may be a portion including the position of the maximum width of the pneumatic tire 1. Here, the position of the maximum width of the pneumatic tire 1 means: the position where the length in the tire axial direction from the surface of the sidewall surface 10 on one side in the tire axial direction to the surface of the sidewall surface 10 on the other side in the tire axial direction is longest.

In fig. 1, the decorative region 11 is provided so as to include a portion where the interface between the tread rubber 6 and the side wall rubber 7 appears on the tire surface. In this way, the decorative region 11 may be provided so as to include a portion where a step is likely to occur on the surface of the sidewall surface 10. The portion where the step is likely to occur on the surface of the sidewall surface 10 typically means: a portion of an end of the tire constituent member. As such a representative portion, for example, a portion in the tire axial direction of the turn-up end 2b of the carcass ply 2 (an end portion of the turn-up portion 2a of the carcass ply 2) is included in addition to a portion where the interface between the tread rubber 6 and the side rubber 7 appears on the tire surface as described above.

As shown in fig. 2, a mark 15 is provided at a position 2 opposite to the annular decorative region 11. The mark 15 is formed by arranging a plurality of letters 16 in the tire circumferential direction. With these multiple letters 16, it is shown: a manufacturer name, a trade name, a brand name, etc. Each letter 16 is trimmed by either a concave or convex line.

Further, a pattern 14 is provided at a portion sandwiched by the 2 marks 15. The pattern 14 is formed of a predetermined pattern. As shown in fig. 4, when the tire surface around the pattern 14 is taken as the 2 nd reference surface 22, the pattern 14 is provided on the 1 st reference surface 21 recessed with respect to the 2 nd reference surface 22. The contour 17 of the pattern 14 is formed by the step difference between the 1 st reference plane 21 and the 2 nd reference plane 22.

Inside the profile 17 forming the pattern 14 are provided: a plurality of protrusions 30 protruding from the 1 st reference surface 21. As shown in fig. 3 to 5, the protrusion 30 is formed by a ridge line 31, 2 inclined surfaces 32, and 2 side surfaces 33, wherein the ridge line 31 extends along the 1 st direction, the 2 inclined surfaces 32 are extended from the ridge line 31 to both sides of the 2 nd direction, and the 2 side surfaces 33 are lowered from both ends of the ridge line 31 in the extending direction perpendicular to the 1 st reference surface 21. In the present embodiment, the 1 st direction is orthogonal to the 2 nd direction. In fig. 3 and 5, the 1 st direction is indicated by an arrow C and the 2 nd direction is indicated by an arrow D, respectively. In fig. 5, each of the projections 30 is drawn by being trimmed with a solid line, and the ridge line 31 is drawn with a broken line.

The ridge line 31 is a straight line extending along the 1 st direction C. The height of the ridge 31 from the 1 st reference surface 21 is constant. Thus, both ends of the ridge line 31 have the same height from the 1 st reference surface 21. The ridge 31 is a portion of the projection 30 that protrudes the highest from the 1 st reference surface 21, and is located higher than the 2 nd reference surface 22 as shown in fig. 4.

The slope 32 is inclined and extends from the ridge 31 to the 1 st reference surface 21 with respect to the 1 st reference surface 21. The inclination angles θ (see fig. 4) of the 2 inclined surfaces 32 on both sides of the ridge line 31 with respect to the direction perpendicular to the 1 st reference surface 21 are the same. Therefore, the protrusion 30 appears as an isosceles triangle when viewed from the 1 st direction C. The opening angle (i.e., 2 × θ) of the 2 slopes 32 is preferably 30 ° or more and 150 ° or less, and more preferably 90 ° or more and 150 ° or less.

The inclined surface 32 is a rectangle having a ridge 31 as one side. The line opposing the ridge line 31 in the inclined surface 32 is an intersection line of the inclined surface 32 and the 1 st reference surface 21. The intersection line of the slope 32 and the 1 st reference surface 21 is the 2 nd direction end 34 of the projection 30.

The side surface 33 is an isosceles triangle surface having an end of the ridge line 31 as a vertex. The intersection line 35 (see fig. 3) of the side face 33 and the inclined face 32 is 2 equilateral sides of the isosceles triangle, and the intersection line 36 of the side face 33 and the 1 st reference face 21 is the base of the isosceles triangle.

The length of the ridge 31 is shorter than the length of the projection 30 in the 2 nd direction D. However, the length of the projection 30 in the 2 nd direction D is preferably 30 times or less, more preferably 20 times or less the length of the ridge 31. Here, the length of the projection 30 in the 2 nd direction D is also the length of an intersection line 36 where the side surface 33 and the 1 st reference surface 21 intersect. The length of the ridge line 31 is, for example, 0.8mm or more and 1.2mm or less. The height of the protrusion 30 (i.e., the length in the direction perpendicular to the 1 st reference surface 21 from the 1 st reference surface 21 to the ridge 31) is, for example, 0.1mm or more and 1.5mm or less.

A plurality of (for example, 50 or more) such projections 30 are arranged without a gap inside the outline 17 of the pattern 14. These protrusions 30 are configured to: the 1 st direction C is the tire radial direction, and the 2 nd direction D is the tire circumferential direction.

The plurality of projections 30 are connected in the 2 nd direction D, i.e., the tire circumferential direction, to form a projection row 23. In the projection row 23, the adjacent projections 30 contact each other. Specifically, the 2 nd direction ends 34 of the 2 nd protrusions 30 adjacent to each other in the 2 nd direction D are aligned with each other. The boundary (i.e., the 2 nd direction end 34) of 2 projections 30 adjacent in the 2 nd direction D is on the 1 st reference surface 21.

In the pattern 14, a plurality of protrusion rows 23 are arranged in parallel. There is no gap between the adjacent protrusion rows 23, and the protrusions 30 of one adjacent protrusion row 23 are in contact with the protrusions 30 of the other adjacent protrusion row 23.

In the adjacent protrusion rows 23, the positions of the ridge lines 31 are shifted in the 2 nd direction D. The offset distance is half the pitch (i.e., half the 1 pitch) of the projection rows 23. Here, 1 pitch of the projection row 23 corresponds to the length of 1 projection 30 in the 2 nd direction D. The distances of the shifts in the 2 nd direction D are the same between all the adjacent protrusion rows 23. Since the projection rows 23 are offset in this way, the ridge lines 31 of the projections 30 and the 2 nd direction ends 34 of the projections 30 are alternately arranged on a straight line in the 1 st direction C as shown in fig. 5. On the pattern 14 are formed: a plurality of rows of such ridges 31 and 2 nd direction ends 34 alternately arranged.

Such a protrusion 30 may be formed by a mold at the time of vulcanization molding of the pneumatic tire 1. The molding surface of the mold used for vulcanization molding is formed with: and irregularities corresponding to the shape of the protrusions 30. Such unevenness can be formed by cutting or laser processing.

As described above, in the pneumatic tire 1 of the present embodiment, the protrusion 30 provided in the decorative region 11 has: an edge line 31 extending along the 1 st direction C, and inclined surfaces 32 inclined and spreading from the edge line 31 to the 1 st reference surface 21 on both sides of the edge line 31 in the 2 nd direction. Here, the length of the ridge 31 is shorter than the length of the protrusion 30 in the 2 nd direction D. Further, a plurality of projection rows 23 are formed, the projection rows 23 are formed by the plurality of projections 30 being in contact and continuous in the 2 nd direction D, and the positions of the ridge lines 31 of the projections 30 in the adjacent projection rows 23 are shifted in the 2 nd direction D.

According to this configuration, the plurality of slopes 32 having a small area are provided without gaps, and light can be reflected by each slope 32. In this way, since light is reflected at the plurality of inclined surfaces 32, the pattern 14 of the decorative region 11 looks bright and looks stereoscopic. Accordingly, the pattern 14 of the decoration region 11 is excellent in visibility and has an aesthetic feeling. When one views the projection 30 from one of the 2 inclined surfaces 32 sandwiching the ridge 31, the one inclined surface 32 looks bright, and the other inclined surface 32 looks dark. Further, since the pattern 14 has a plurality of protrusions 30, a fine pattern of light and shade can be seen in the pattern 14, and the pattern 14 is aesthetically pleasing. In this way, a new visual effect is created by the reflection of light at the plurality of inclined surfaces 32.

Further, when the pneumatic tire 1 is inflated, there are cases where: a rib-like recessed portion extending in the tire radial direction. However, by providing a plurality of protrusions 30 in the pattern 14 of the decoration region 11, such recesses become less noticeable.

Since such a concave portion is conspicuous at a position further toward the tire radial direction outer side than the position of the maximum width of the pneumatic tire 1, if the decorative region 11 is disposed further toward the tire radial direction outer side than the position of the maximum width, it is conspicuously exhibited: the concave portion becomes less conspicuous. Further, by providing the decorative region 11 at the end portion of the tire component, it is possible to obtain: the effect of making the step difference on the surface of the sidewall 10 due to the end inconspicuous.

Further, since the inclination angle θ of the 2 inclined surfaces 32 with respect to the 1 st ridge line 31 is the same with respect to the direction perpendicular to the 1 st reference surface 21, even if one observes the pattern 14 from any one side of the 2 inclined surfaces 32 of the protrusion 30, one can see the gradation feeling by light and shade in the same manner.

In addition, by making the 2 nd direction D of the protrusion 30 the tire circumferential direction, a unique visual effect can be produced when the pneumatic tire 1 rotates.

The 1 st reference surface 21 is recessed and lowered with respect to the 2 nd reference surface 22 around the 1 st reference surface, and a projection 30 is provided on the 1 st reference surface 21. However, the ridge 31 of the protrusion 30 is higher than the 2 nd reference surface 22. According to this configuration, light always strikes a portion near the ridge line 31 of the protrusion 30, and strong reflection occurs, and light does not strike a portion near the 1 st reference surface 21 of the protrusion 30 much, and only weak reflection occurs. As a result, the portion near the ridge line 31 of the protrusion 30 appears bright, and the portion near the 1 st reference surface 21 of the protrusion 30 appears dark, resulting in: the contrast of the light and the shade is clear and clear.

In addition, since both ends of the ridge line 31 of the protrusion 30 have the same height from the 1 st reference surface 21, the mold for forming the protrusion 30 can be easily manufactured.

In addition, as long as the opening angle of the 2 slopes 32 of the protrusion 30 is 30 ° or more, the unevenness for forming the protrusion 30 in the mold used at the time of vulcanization molding does not need to be excessively deep. As a result, the air flow in the above-described unevenness of the mold is good at the time of vulcanization molding, and air stagnation is less likely to occur inside the mold, so that the pneumatic tire 1 is less likely to be defective. This effect becomes more remarkable as long as the opening angle of the 2 inclined surfaces 32 of the protrusion 30 is 90 ° or more. In addition, if the opening angle of the 2 inclined surfaces 32 is 150 ° or less, the height of the projection 30 can be secured to some extent, and therefore, the effect due to the presence of the projection 30 becomes more remarkable.

The above embodiments are merely examples, and the scope of the present invention is not limited to the above embodiments. The above embodiments may be variously modified without departing from the scope of the present invention. Although a plurality of modifications will be described below, any one of the plurality of modifications may be applied to the above-described embodiment, and any 2 or more combinations of the plurality of modifications may be applied within a range where no contradiction exists.

< example 1 of variation

The arrangement direction of the projections 30 is not limited to the direction of the above embodiment. For example, the 1 st direction C, which is the extending direction of the ridge line 31, may be the tire circumferential direction, and the 2 nd direction D orthogonal to the 1 st direction C may be the tire radial direction. By arranging the protrusions 30 such that the 1 st direction C is the tire circumferential direction, the appearance of the pattern 14 is different from that of the above embodiment.

In addition, in the pattern 14, there may be formed: the 1 st direction C is a region where the projections 30 in the tire radial direction are gathered, and the 1 st direction C is a region where the projections 30 in the tire circumferential direction are gathered. In the pattern 14, the protrusions 30 whose 1 st direction C is the tire radial direction and the protrusions 30 whose 1 st direction C is the tire circumferential direction may be mixed.

< modification 2 >

As shown in fig. 6, the heights of the 2 ends 131a and 131b of the ridge 131 of the protrusion 130 from the 1 st reference surface 21 may be different. Such protrusions 130 are preferably configured to: the 1 st direction C, which is the extending direction of the ridge 131, is the tire radial direction. In this preferred arrangement, either one of the higher end 131a and the lower end 131b may be the inner side in the tire radial direction, and either one may be the outer side in the tire radial direction.

The inclination angles of the 2 inclined surfaces 132 on both sides of the ridge line 131 with respect to the direction perpendicular to the 1 st reference surface 21 are the same. In the case of fig. 6, regarding the opening angles of the 2 slopes 132 of the projection 130, the opening angle of the higher end 131a is different from the opening angle of the lower end 131b, and the opening angle with the higher end 131a as a vertex is larger than: a flare angle with the lower end 131b as an apex. Specifically, it is preferable that the opening angle with the higher end 131a as a vertex is 40 ° or more and 160 ° or less, and the opening angle with the lower end 131b as a vertex is 30 ° or more and 150 ° or less.

In contrast to the above, the opening angle with the high end 131a as the apex may be smaller than: a flare angle with the lower end 131b as an apex. The opening angle with the higher end 131a as the apex and the opening angle with the lower end 131b as the apex may be the same.

As described in this modification, by making the heights of the 2 ends 131a, 131b of the ridge line 131 different from the 1 st reference plane 21, the pattern 14 exhibits: the appearance is different from the case where both ends of the ridge line 31 have the same height from the 1 st reference surface 21 as in the above embodiment.

< example 3 >

As shown in fig. 7, when the 1 st reference surface 21 is recessed with respect to the 2 nd reference surface 22 around it, the ridge line 31 at the highest position of the protrusion 30 may be located: a position lower than the 2 nd reference surface 22. In the case of this modification, since the projection 30 is protected by the 2 nd reference surface 22, the projection 30 can be prevented from being damaged.

< example 4 >

As shown in fig. 8, the 1 st reference surface 21 may be convex with respect to the 2 nd reference surface 22 around the 1 st reference surface 21, and a protrusion 30 may be provided on the 1 st reference surface 21. In the case of this modification, the light always strikes the inclined surface 32 of the projection 30, and therefore the projection 30 looks more glaring.

< example 5 >

The pattern provided in the decorative region 11 is not limited to the pattern shown in fig. 2. In addition, a mark (for example, a character, a symbol, or a figure) may be provided instead of the pattern 14, and a plurality of protrusions 30 may be provided inside the outline of the mark or the like.

Further, the projections 30 may be provided not inside the outline 17 (or the outline of the logo or the like) of the pattern 14, and a plurality of projections 30 may be provided outside the outline. In this case, the pattern 14 (or a logo or the like) is provided as an area without the projections 30 among the areas where the plurality of projections 30 are provided.

< example 6 >

The distance of the shift in the 2 nd direction D of the adjacent protrusion rows 23 is not limited to the half pitch of the protrusion rows 23, and may be 2/3 pitch or the like. The distances of the shifts between all adjacent protrusion rows 23 are preferably the same.

< Change example 7 >

The inclination angle θ of the 2 inclined surfaces 32 of the 1 projection 30 with respect to the direction perpendicular to the 1 st reference surface 21 may be different.

Claims (7)

1. A pneumatic tire provided with a decorative region on a sidewall surface, a 1 st reference surface and a plurality of protrusions protruding from the 1 st reference surface on the decorative region,

it is characterized in that the preparation method is characterized in that,

the protrusion has: a ridge extending along the 1 st direction; and inclined surfaces which are inclined and spread from the ridge line to the 1 st reference surface with respect to the 1 st reference surface on both sides in the 2 nd direction with the ridge line as a center,

the length of the ridge is shorter than the length of the projection in the 2 nd direction,

a plurality of projection rows formed by a plurality of the projections being in contact and connected in the 2 nd direction are formed,

in the adjacent protrusion rows, the positions of the protrusions are shifted in the 2 nd direction.

2. A pneumatic tire according to claim 1,

the inclination angles of 2 of the inclined planes with respect to 1 of the ridge lines with respect to the direction perpendicular to the 1 st reference plane are the same.

3. A pneumatic tire according to claim 1 or 2,

the 2 nd direction is a tire circumferential direction.

4. A pneumatic tire according to claim 1 or 2,

the 2 nd direction is a tire radial direction.

5. A pneumatic tire according to claim 1 or 2,

the 1 st reference plane is recessed and becomes lower with respect to the 2 nd reference plane therearound,

the ridge is higher than the 2 nd reference surface.

6. A pneumatic tire according to claim 1 or 2,

the heights of the two ends of the ridge from the 1 st reference surface are the same.

7. A pneumatic tire according to claim 1 or 2,

the heights of the two ends of the ridge line from the 1 st reference surface are different.

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