JP7288385B2 - bead ring - Google Patents

Description

The present invention relates to bead rings.

The bead ring of Patent Document 1 includes a first ring piece and a second ring piece fitted to the first ring piece. When the second ring piece is fitted with the first ring piece, a hole for discharging air is formed by the first opposing wall of the first ring piece and the groove provided in the second opposing wall of the second ring piece. is configured.

JP 2018-153999 A

However, with the bead ring of Patent Literature 1, when rubber accumulates in the hole, it is necessary to separate the first ring piece and the second ring piece for cleaning.

An object of the present invention is to provide a bead ring that can reduce the frequency of cleaning.

One aspect of the present invention comprises: an annular main body; and a plate-shaped shim detachably attached to the main body; An exhaust groove extending in the circumferential direction of the main body, wherein the shim protrudes from a plate-shaped main plate disposed in the exhaust groove of the main body and a groove wall defining the exhaust groove from the main plate. and a protrusion.

According to this configuration, the rubber deposited in the gap between the shim and the groove wall in the exhaust groove is scraped out of the exhaust groove by the projecting portion of the shim when the shim is removed from the main body. As a result, by removing the shim from the main body, the rubber in the exhaust groove is discharged to the outside of the exhaust groove, thereby facilitating cleaning of the exhaust groove. Moreover, since the rubber in the exhaust groove is discharged to the outside of the exhaust groove by removing the shim from the main body, it is possible to reduce the frequency of cleaning the exhaust groove again after removing the shim from the main body.

The main body may include a working hole that opens toward the cavity and communicates with the exhaust groove, and at least a portion of the shim may be exposed in the working hole.

Generally, when the bead ring is mounted on the vulcanizer, the side of the bead ring opposite the cavity is covered by a side plate. According to the present disclosure, since a part of the shim is exposed in the working hole that opens to the cavity side, even when the bead ring is attached to the vulcanizer, the shim can be pushed through the working hole from the cavity side. The shim is removed from the main body by pushing toward the molding surface. Accordingly, by removing the shim from the main body, the rubber accumulated in the gap between the shim and the groove wall can be easily discharged out of the exhaust groove without removing the bead ring from the vulcanizer.

The shim may include a plurality of the protrusions, the plurality of protrusions may be arranged side by side in the circumferential direction, and two of the protrusions adjacent in the circumferential direction are at least partially aligned in the circumferential direction. may be arranged so as to overlap each other.

According to this configuration, two projections adjacent in the circumferential direction are arranged so that at least a part of them overlap in the circumferential direction, so that rubber deposited in the exhaust groove is suppressed from remaining in the exhaust groove. can.

The projecting portion may be a plate piece partially cut and raised from the main plate.

A hole may be provided in the main plate, and the protrusion may be formed around the hole.

The protruding portion may be formed in a knurled shape.

ADVANTAGE OF THE INVENTION According to this invention, the bead ring which can reduce the frequency of cleaning can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing of the tire vulcanization mold which concerns on 1st Embodiment of this invention. The side view which looked at the bead ring which concerns on 1st Embodiment from the cavity side. FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2; FIG. 4 is a schematic diagram showing the surface shape of the shim according to the first embodiment; FIG. 5 is a cross-sectional view taken along line VV of FIG. 4; The figure for demonstrating how to remove a shim. The typical figure which shows the surface shape of the shim which concerns on 2nd Embodiment. Sectional drawing along the VIII-VIII line of FIG. The typical figure which shows the surface shape of the shim which concerns on 3rd Embodiment. FIG. 10 is a cross-sectional view taken along line XX of FIG. 9;

A bead ring according to an embodiment will be described below with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a cross-sectional view showing a schematic configuration of a tire vulcanization mold 1 according to the present embodiment, showing only one side in the tire radial direction (the right side in FIG. 1). In FIG. 1, the pneumatic tire T to be vulcanized in the tire vulcanizing mold 1 is also shown by a virtual line (chain double-dashed line). The pneumatic tire T is manufactured by setting a green tire in a tire vulcanizing mold 1 so that the tire axis is oriented in the vertical direction, and vulcanizing the tire.

As shown in FIG. 1, a tire vulcanization mold 1 includes an annular sector mold 2, a pair of upper and lower side plates 3, 3 positioned on the inner diameter side of the sector mold 2, and a pair of upper and lower bead rings positioned further on the inner diameter side. 4, 4, and a cavity 5 in which the pneumatic tire T is vulcanized is defined inside them. The tire vulcanization mold 1 is configured as a so-called segmented mold. A side plate 3 covers the surface of the bead ring 4 opposite to the cavity 5 .

The sector mold 2, the side plates 3, 3, and the inner wall surfaces defining the cavity 5 of the bead rings 4, 4 are formed by vulcanizing the tread portion T1, the sidewall portion T2, and the bead portion T3 of the pneumatic tire T, respectively. It is configured as a molding surface that

FIG. 2 is a side view of the bead ring 4 according to the present embodiment viewed from the cavity 5 side, and shows only one side in the tire radial direction (the right side in FIG. 1). 3 is a schematic cross-sectional view along line III-III in FIG.

2 and 3, the bead ring 4 of this embodiment comprises an annular body 10 and six plate-shaped shims 40 (four shown in FIG. 2) detachably attached to the body 10. Prepare.

The main body 10 of the bead ring 4 according to this embodiment is a so-called split-type bead ring. The body 10 of the bead ring 4 comprises an annular first ring piece 20 and an annular second ring piece 30 fitted to the first ring piece 20 . The second ring piece 30 is fixed to the first ring piece 20 by fixing means (not shown) such as screws. The first ring piece 20 and the second ring piece 30 are arranged coaxially.

The first ring piece 20 consists of a single piece. Referring to FIG. 3, the first ring piece 20 has a side shaping surface 21 that shapes the side of the bead T3 (shown in FIG. 1). The first ring piece 20 also has a first facing surface 22 that faces the second ring piece 30 .

The first facing surface 22 includes a first grooved surface 23 and a first mating surface 24 . The first mating surface 24 is arranged radially inward of the first ring piece 20 with respect to the first grooved surface 23 .

The first groove forming surface 23 is provided continuously with the side forming surface 21 . The first groove forming surface 23 is inclined to one axial side (lower side in FIG. 3) from the radial outer side (right side in FIG. 3) of the first ring piece 20 toward the inner side (left side in FIG. 3). are doing. Also, the first groove forming surface 23 is provided on the entire circumference of the first ring piece 20 . As a result, the first groove forming surface 23 is formed in the shape of a truncated cone side surface.

The first mating surface 24 is provided continuously with the first groove forming surface 23 in the radial direction of the first ring piece 20 . The first mating surface 24 extends parallel to the radial direction of the first ring piece 20 .

The second ring piece 30 consists of a single piece. The second ring piece 30 has a bottom molding surface 31 that molds the bottom of the bead portion T3 (shown in FIG. 1). The second ring piece 30 has a second facing surface 32 facing the first ring piece 20 .

The second facing surface 32 includes a second groove forming surface 33 , a second mating surface 34 and a passage forming surface 35 . The second mating surface 34 and the passage forming surface 35 are arranged radially inward of the second ring piece 30 with respect to the second groove forming surface 33 .

The second groove forming surface 33 is provided continuously with the bottom molding surface 31 . The second groove forming surface 33 is inclined to one axial side (lower side in FIG. 3) from the radial outer side (right side in FIG. 3) of the second ring piece 30 toward the inner side (left side in FIG. 3). are doing. Also, the second groove forming surface 33 is provided on the entire circumference of the second ring piece 30 . Thereby, the second groove forming surface 33 is formed in the shape of a side surface of a truncated cone.

The second grooved surface 33 of the second ring piece 30 faces the first grooved surface 23 of the first ring piece 20 . Also, the second grooved surface 33 of the second ring piece 30 is separated from the first grooved surface 23 of the first ring piece 20 . Also, the second groove forming surface 33 of the second ring piece 30 extends parallel to the first groove forming surface 23 of the first ring piece 20 .

The second mating surface 34 is provided continuously with the second groove forming surface 33 in the radial direction of the second ring piece 30 . The second mating surface 34 extends parallel to the radial direction of the second ring piece 30 .

The second mating surface 34 of the second ring piece 30 faces the first mating surface 24 of the first ring piece 20 . Also, the second mating surface 34 of the second ring piece 30 is in contact with the first mating surface 24 of the first ring piece 20 .

The passage forming surface 35 is provided continuously with the second mating surface 34 in the circumferential direction of the second ring piece 30 . Although not shown, the passage forming surfaces 35 and the second mating surfaces 34 are provided alternately in the circumferential direction of the second ring piece 30 . The passage forming surface 35 extends parallel to the radial direction of the second ring piece 30 in the cross section shown in FIG.

The passage forming surface 35 of the second ring piece 30 faces the first mating surface 24 of the first ring piece 20 . Also, the passage forming surface 35 of the second ring piece 30 is separated from the first mating surface 24 of the first ring piece 20 .

A main body 10 of the bead ring 4 has a bead molding surface 11 for vulcanization molding of the bead portion T3 (shown in FIG. 1) of the pneumatic tire T. As shown in FIG. Further, the main body 10 of the bead ring 4 is provided with an exhaust groove 12 that opens to the bead forming surface 11 and accommodates the shim 40 , and an exhaust passage 13 that communicates with the exhaust groove 12 .

The bead molding surface 11 is formed by the side surface molding surface 21 of the first ring piece 20 and the bottom surface molding surface 31 of the second ring piece 30 by fitting the first ring piece 20 and the second ring piece 30 together. be done.

The exhaust groove 12 has a first groove forming surface 23 of the first ring piece 20 and a second groove forming surface 33 of the second ring piece 30 when the first ring piece 20 and the second ring piece 30 are fitted together. is defined by In other words, the exhaust groove 12 is a gap formed between the first grooved surface 23 of the first ring piece 20 and the second grooved surface 33 of the second ring piece 30 . The first grooved surface 23 of the first ring piece 20 and the second grooved surface 33 of the second ring piece 30 according to the present embodiment are examples of groove walls according to the present invention.

The exhaust groove 12 extends from the radially outer side (the right side in FIG. 3) toward the inner side (the left side in FIG. 3) to one axial side (the lower side in FIG. 3). The exhaust groove 12 is provided over the entire circumference of the main body 10 of the bead ring 4 . As a result, the exhaust groove 12 is formed in a truncated cone shape.

The exhaust groove 12 communicates with the cavity 5 . The exhaust groove 12 opens in the bead forming surface 11 so as to separate the side surface forming surface 21 of the first ring piece 20 and the bottom surface forming surface 31 of the second ring piece 30 .

The exhaust passage 13 of the present embodiment has a first mating surface 24 of the first ring piece 20 and a passage forming surface of the second ring piece 30 when the first ring piece 20 and the second ring piece 30 are fitted together. 35. In other words, the exhaust passage 13 of this embodiment is a gap formed between the first mating surface 24 of the first ring piece 20 and the passage forming surface 35 of the second ring piece 30 .

The exhaust passage 13 opens on the radially inner side surface of the main body 10 of the bead ring 4 . On the other hand, the exhaust passage 13 communicates with the exhaust groove 12 . As a result, air in the cavity 5 is discharged to the outside of the bead ring 4 through the exhaust groove 12 and the exhaust passage 13 during vulcanization molding.

The main body 10 of the bead ring 4 also has a working hole 14 communicating with the exhaust groove 12 . The working hole 14 opens in the end face of the first ring piece 20 on the cavity 5 side (upper side in FIG. 3). The working hole 14 axially penetrates the first ring piece 20 and reaches the second ring piece 30 .

As shown in FIG. 2, the working hole 14 is provided so as to straddle two shims 40 adjacent in the circumferential direction.

Referring to FIG. 3 , the opening of the working hole 14 on the cavity 5 side is closed by a lid member 15 . Referring to FIGS. 2 and 3 together, one lid member 15 is provided with two fixing means 16 . The fixing means 16 extends in the axial direction of the main body 10 of the bead ring 4 and is screwed into a threaded hole provided in the second ring piece 30 .

As shown in FIG. 2 , the lid member 15 is provided so as to straddle two shims 40 adjacent to each other in the circumferential direction of the bead ring 4 . Thus, the two fixing means 16 of the lid member 15 are arranged at positions corresponding to both ends of each shim 40 in the circumferential direction.

The shim 40 of this embodiment is a replaceable shim. As described above, the bead ring 4 of this embodiment includes six shims 40 (only four are shown in FIG. 2).

Referring to FIG. 2, the shims 40 are arranged side by side in the circumferential direction of the main body 10 of the bead ring 4 . As a result, the shim 40 is provided over the entire circumference of the body 10 of the bead ring 4 .

Referring to FIG. 3 , the shim 40 of this embodiment is provided within the exhaust groove 12 of the body 10 of the bead ring 4 . The shim 40 is provided to adjust the size of the area through which the air passes in the exhaust groove 12 . Also, the shim 40 abuts on the fixing means 16 at the end opposite to the cavity 5 (the end on the lower left side in FIG. 3). Thereby, the shim 40 is positioned within the exhaust groove 12 . Also, the shim 40 is exposed in the working hole 14 at the end opposite to the cavity 5 (lower left end in FIG. 3).

The shim 40 of this embodiment includes a first plate member 50 and a second plate member 60 . The first plate-like member 50 and the second plate-like member 60 are put together at surfaces facing each other. Moreover, the shim 40 of the present embodiment is provided on the first plate member 50 and provided on the first surface 41 facing the first groove forming surface 23 of the first ring piece 20 and the second plate member 60. , and a second surface 42 facing the second grooved surface 33 of the second ring piece 30 .

A shim 40 is provided along the exhaust groove 12 . Specifically, the shim 40 extends from the radially outer side (the right side in FIG. 3) of the main body 10 of the bead ring 4 toward the inner side (the left side in FIG. 3) in the axial direction of the main body 10 of the bead ring 4. It is provided so as to extend downward (lower side in FIG. 3). Moreover, as described above, the shim 40 is provided over the entire circumference of the main body 10 of the bead ring 4 . As a result, the first surfaces 41 of the six shims 40 are formed in a truncated cone shape. Similarly, the second surfaces 42 of the six shims 40 are formed in the shape of a truncated cone side surface.

[Detailed structure of shim]
FIG. 4 is a schematic diagram for explaining the surface shape of the first surface 41 of the shim 40 according to this embodiment. The first surface 41 of the shim 40 has a truncated cone shape as described above, but is shown as a plane for the sake of explanation. 4 shows the surface shape of the first surface 41 provided on the first plate member 50, the second surface 42 provided on the second plate member 60 has the same configuration. and detailed description thereof will be omitted. 5 is a cross-sectional view taken along line VV of FIG. 4. FIG.

Referring to FIGS. 4 and 5, the first plate-like member 50 includes a plate-like first main plate 51 and a first protrusion 52 that protrudes from the first main plate 51 toward the first groove forming surface 23. . The 1st main plate 51 of this embodiment is an example of the main plate concerning the present invention. Also, the first projecting portion 52 of the present embodiment is an example of a projecting portion according to the present invention.

As shown in FIG. 4 , a plurality of first protrusions 52 of the present embodiment are arranged side by side in the circumferential direction of the shim 40 . More specifically, the two first protrusions 52 adjacent in the circumferential direction of the shim 40 are arranged at different positions in a direction perpendicular to the circumferential direction (the depth direction of the exhaust groove 12). Also, the two first protrusions 52 adjacent in the circumferential direction of the shim 40 are arranged so as to overlap in the circumferential direction of the shim 40 . In other words, an imaginary straight line VL (an example is shown in FIG. 4) extending in a direction perpendicular to the circumferential direction of the shim 40 from the end of the shim 40 in the circumferential direction of the arbitrary first projection 52 is the other first projection. Pass 52.

Further, referring to FIG. 5 , the first projecting portion 52 of the present embodiment is a plate piece cut and raised from the first main plate 51 . The first projecting portion 52 of the present embodiment extends from one side in the depth direction of the exhaust groove 12 (lower side in FIG. 5) toward the other side in the depth direction of the exhaust groove 12 (upper side in FIG. 5). It extends so as to approach the 1-groove forming surface 23 . In other words, the first projecting portion 52 of the present embodiment is arranged so as to approach the first groove forming surface 23 from the side opposite to the cavity 5 (lower side in FIG. 5) toward the cavity 5 side (upper side in FIG. 5). extended. As a result, the first projecting portion 52 of the present embodiment extends from the side of the exhaust groove 12 opposite to the cavity 5 (lower side in FIG. 5) toward the cavity 5 side (upper side in FIG. 5) from the first main plate 51. The amount of protrusion is large.

In addition, the first main plate 51 of the present embodiment is arranged away from the first grooved surface 23 by the contact of the first projecting portion 52 with the first grooved surface 23 . In this embodiment, the first projecting portion 52 is formed such that the dimension D of the gap between the first grooved surface 23 and the first main plate 51 is 0.02 mm. During vulcanization molding, the air in the cavity 5 passes through the gap between the first grooved surface 23 and the first main plate 51, and flows radially inside the body 10 (shown in FIG. 3) of the bead ring 4. discharged to

Referring to FIG. 5 , the second plate-like member 60 includes a plate-like second main plate 61 and a second protrusion 62 that protrudes from the second main plate 61 toward the second groove forming surface 33 . The 2nd main plate 61 of this embodiment is an example of the main plate concerning the present invention. Also, the second projecting portion 62 of the present embodiment is an example of the projecting portion according to the present invention. As described above, the surface shape of the second surface 42 provided on the second plate member 60 of this embodiment is the same as the surface shape of the first surface 41 provided on the first plate member 50 . Specifically, the arrangement of the second protrusions 62 on the second surface 42 is the same as the arrangement of the first protrusions 52 on the first surface 41 .

The second projecting portion 62 of the present embodiment is a plate piece cut and raised from the second main plate 61 . The second projecting portion 62 of the present embodiment extends from one side in the depth direction of the exhaust groove 12 (lower side in FIG. 5) toward the other side in the depth direction of the exhaust groove 12 (upper side in FIG. 5). It extends so as to approach the two-groove forming surface 33 . In other words, the second projecting portion 62 of the present embodiment is arranged so as to approach the second groove forming surface 33 from the side opposite to the cavity 5 (lower side in FIG. 5) toward the cavity 5 side (upper side in FIG. 5). extended. As a result, the second projecting portion 62 of the present embodiment extends from the second main plate 61 toward the cavity 5 side (upper side in FIG. 5) from the opposite side of the exhaust groove 12 to the cavity 5 (lower side in FIG. 5). The amount of protrusion is large.

Further, the second main plate 61 of the present embodiment is arranged apart from the second grooved surface 33 by the contact of the second projecting portion 62 with the second grooved surface 33 . In this embodiment, the second projecting portion 62 is formed such that the dimension D of the gap between the second grooved surface 33 and the second main plate 61 is 0.02 mm. During vulcanization molding, the air in the cavity 5 passes through the gap between the second grooved surface 33 and the second main plate 61 and is discharged radially inward of the main body of the bead ring 4 .

The amount of protrusion of the first projecting portion 52 from the first main plate 51 and the amount of projecting of the second projecting portion 62 from the second main plate 61 correspond to one side (the lower side in FIG. 5) of the exhaust groove 12 in the depth direction. 5 toward the other side (upper side in FIG. 5), the shim 40 is less likely to come off from the exhaust groove 12 when the shim 40 is attached to the main body 10 of the bead ring 4 . On the other hand, the amount of protrusion of the first protrusion 52 from the first main plate 51 and the amount of protrusion of the second protrusion 62 from the second main plate 61 are different from each other in the depth direction of the exhaust groove 12 ( Since the number of shims 40 decreases from the top side to the one side (bottom side in FIG. 5), attachment (insertion) of the shim 40 to the main body 10 of the bead ring 4 is facilitated.

[How to remove the shim]
6A and 6B are diagrams for explaining a method of removing the shim 40 from the main body 10 of the bead ring 4. FIG. Referring to FIG. 6, first, the lid member 15 (shown in FIG. 3) is removed from the main body 10 of the bead ring 4. As shown in FIG. Next, the rod member 70 is inserted into the working hole 14 and the shim 40 is pushed toward the opening side of the exhaust groove 12 provided in the bead forming surface 11 . As a result, the shim 40 protrudes from the opening of the exhaust groove 12 provided on the bead molding surface 11, so that the shim 40 can be removed. At this time, the rubber R accumulated in the exhaust groove 12 is scraped out of the exhaust groove 12 by the first projecting portion 52 and the second projecting portion 62 (shown in FIG. 5) of the shim 40 .

According to the bead ring 4 of this embodiment, the following effects are obtained.

According to the bead ring 4 of this embodiment, the rubber deposited in the gap between the shim 40 in the exhaust groove 12 and the first groove forming surface 23 is removed from the shim 40 when the shim 40 is removed from the main body 10 . 1 projecting portion 52 scrapes it out of the exhaust groove 12 . Similarly, the rubber R deposited in the gap between the shim 40 and the second groove forming surface 33 in the exhaust groove 12 is removed by the second projecting portion 62 of the shim 40 when the shim 40 is removed from the main body 10 . 12 is scraped out. In other words, the cleaning of the inside of the exhaust groove 12 is completed at the same time as the replacement of the shim 40 for adjusting the size of the area through which the air passes in the exhaust groove 12 . Since the rubber R in the exhaust groove 12 is discharged outside the exhaust groove 12 by removing the shim 40 from the main body 10, the frequency of cleaning the exhaust groove 12 again after removing the shim 40 from the main body 10 can be reduced.

Moreover, since the shim 40 of the present embodiment is replaceable, the rubber R accumulated in the exhaust groove 12 is discharged out of the exhaust groove 12 each time the shim 40 is replaced, which is particularly effective.

Further, when the bead ring 4 is attached to the vulcanizer, the side plate 3 covers the surface of the bead ring 4 opposite to the cavity 5 . According to the bead ring 4 of this embodiment, a part of the shim 40 is exposed in the working hole 14 opened to the cavity 5 side. The shim 40 is removed from the main body 10 by pushing the shim 40 toward the bead forming surface 11 through the working hole 14 from the cavity 5 side. Accordingly, by removing the shim 40 from the main body 10, the rubber R accumulated in the exhaust groove 12 can be easily discharged out of the exhaust groove 12 without removing the bead ring 4 from the vulcanizer.

According to the above embodiment, the two first projections 52 that are adjacent in the circumferential direction are arranged so that at least a part of them overlap in the circumferential direction. can be suppressed from remaining inside.

Similarly, since two second protrusions 62 adjacent in the circumferential direction are arranged so that at least a portion of the second protrusions 62 overlap in the circumferential direction, the rubber R accumulated in the exhaust groove 12 remains in the exhaust groove 12. can be suppressed.

(Second embodiment)
The bead ring of the second embodiment is similar to that of the first embodiment except for the surface shape of the shim. In the second embodiment, the same reference numerals are assigned to the same configurations as in the first embodiment, and detailed description thereof will be omitted.

FIG. 7 is a schematic diagram for explaining the surface shape of the first surface 141 of the shim 140 according to this embodiment. A first surface 141 of the shim 140 has a truncated conical side surface as in the first embodiment, but is shown flat for the sake of explanation. 7 shows the surface shape of the first surface 141 provided on the first plate-like member 150, the second surface 142 provided on the second plate-like member 160 has a similar configuration. and detailed description thereof will be omitted. 8 is a cross-sectional view taken along line VIII-VIII of FIG.

Referring to FIG. 8 , the shim 140 of this embodiment includes a first plate member 150 and a second plate member 160 . The first plate-like member 150 and the second plate-like member 160 are put together on the surfaces facing each other. In addition, the shim 140 of the present embodiment is provided on the first plate member 150 and provided on the first surface 141 facing the first grooved surface 23 of the first ring piece 20 and the second plate member 160. , and a second surface 142 facing the second grooved surface 33 of the second ring piece 30 .

7 and 8, the first plate-like member 150 includes a plate-like first main plate 151 and a first protrusion 152 that protrudes from the first main plate 151 toward the first groove forming surface 23. . The 1st main plate 151 of this embodiment is an example of the main plate concerning the present invention. Also, the first projecting portion 152 of the present embodiment is an example of a projecting portion according to the present invention.

The first main plate 151 of this embodiment is provided with a plurality of first holes 151a. The first projecting portion 152 of the present embodiment is provided around the first hole portion 151a. Specifically, the first projecting portion 152 of the present embodiment is formed in a flange shape that rises from the periphery of the first hole portion 151 a toward the first groove forming surface 23 .

As shown in FIG. 7, a plurality of first protrusions 152 of the present embodiment are provided side by side in the circumferential direction. More specifically, two first protrusions 152 adjacent in the circumferential direction are arranged at different positions in a direction perpendicular to the circumferential direction (the depth direction of the exhaust groove 12). Also, two first protrusions 152 adjacent in the circumferential direction are arranged so as to overlap in the circumferential direction. In other words, an imaginary straight line VL (an example is shown in FIG. 7) extending from the circumferential end of an arbitrary first protrusion 152 in a direction orthogonal to the circumferential direction passes through other first protrusions 152 .

Further, as shown in FIG. 8 , the first main plate 151 of the present embodiment is arranged away from the first grooved surface 23 by contacting the first protrusion 152 with the first grooved surface 23 . In this embodiment, the first projecting portion 152 is formed such that the dimension D of the gap between the first grooved surface 23 and the first main plate 151 is 0.02 mm. At the time of vulcanization molding, the air in the cavity 5 passes through the gap between the first grooved surface 23 and the first main plate 151 and flows radially inside the main body 10 (shown in FIG. 3) of the bead ring 4. discharged to

Referring to FIG. 8 , the second plate member 160 includes a plate-shaped second main plate 161 and a second protrusion 162 that protrudes from the second main plate 161 toward the second groove forming surface 33 . The second main plate 161 of this embodiment is an example of a main plate according to the present invention. Also, the second projecting portion 162 of the present embodiment is an example of a projecting portion according to the present invention. As described above, the surface shape of the second surface 142 of the second plate member 160 of this embodiment is the same as the surface shape of the first surface 141 of the first plate member 150 . Specifically, the arrangement of the second protrusions 162 on the second surface 142 is the same as the arrangement of the first protrusions 152 on the first surface 141 .

The second main plate 161 of this embodiment is provided with a plurality of second holes 161a. The second projecting portion 162 of the present embodiment is provided around the second hole portion 161a. Specifically, the second protruding portion 162 of the present embodiment is formed in a flange shape that rises from the periphery of the second hole portion 161 a toward the second groove forming surface 33 .

Moreover, the second main plate 161 of the present embodiment is arranged apart from the second grooved surface 33 by the contact of the second projecting portion 162 with the second grooved surface 33 . In this embodiment, the second projecting portion 162 is formed such that the dimension D of the gap between the second grooved surface 33 and the second main plate 161 is 0.02 mm. At the time of vulcanization molding, the air in the cavity 5 passes through the gap between the second grooved surface 33 and the second main plate 161 and flows radially inside the main body 10 (shown in FIG. 3) of the bead ring 4. discharged to

The second embodiment has the same effects as the first embodiment.

In the second embodiment, the first protruding portion 152 and the second protruding portion 162 are formed by burring, but the present invention is not limited to this. It may be burrs generated in the

(Third embodiment)
The bead ring of the third embodiment is similar to that of the first embodiment except for the surface shape of the shim. In the third embodiment, the same reference numerals are assigned to the same configurations as in the first embodiment, and detailed description thereof will be omitted.

FIG. 9 is a schematic diagram for explaining the surface shape of the first surface 241 of the shim 240 according to this embodiment. A first surface 241 of the shim 240 has a truncated conical side surface shape as in the first embodiment, but is shown as a plane for the sake of explanation. 9 shows the surface shape of the first surface 241 provided on the first plate-shaped member 250, the second surface 242 provided on the second plate-shaped member 260 has a similar configuration. and detailed description thereof will be omitted. 10 is a cross-sectional view taken along line XX of FIG. 9. FIG.

Referring to FIG. 10 , the shim 240 of this embodiment includes a first plate member 250 and a second plate member 260 . The first plate-like member 250 and the second plate-like member 260 are put together on the surfaces facing each other. Further, the shim 240 of the present embodiment is provided on the first plate member 250 and provided on the first surface 241 facing the first grooved surface 23 of the first ring piece 20 and the second plate member 260. , and a second surface 242 facing the second grooved surface 33 of the second ring piece 30 .

9 and 10, the first plate-like member 250 includes a plate-like first main plate 251 and a first protrusion 252 that protrudes from the first main plate 251 toward the first groove forming surface 23. . The 1st main plate 251 of this embodiment is an example of the main plate concerning the present invention. Also, the first projecting portion 252 of the present embodiment is an example of a projecting portion according to the present invention.

As shown in FIG. 9, the first projecting portion 252 of the present embodiment is formed in a twilled knurl shape. Specifically, the first surface 241 of the present embodiment is provided with a plurality of first grooves 241 a extending so as to intersect both the circumferential direction and the depth direction of the exhaust groove 12 . In other words, the first surface 241 is provided with first grooves 241a in an oblique grid pattern. The plurality of first grooves 241a define the first projecting portion 252 of the present embodiment.

As shown in FIG. 9, a plurality of first protrusions 252 of the present embodiment are provided side by side in the circumferential direction. More specifically, the two first projections 252 adjacent in the circumferential direction are arranged at different positions in a direction perpendicular to the circumferential direction (the depth direction of the exhaust groove 12). Also, two first protrusions 252 adjacent in the circumferential direction are arranged so as to overlap in the circumferential direction. In other words, an imaginary straight line VL (an example is shown in FIG. 9) extending from the circumferential end of an arbitrary first protrusion 252 in a direction orthogonal to the circumferential direction passes through other first protrusions 252 .

Further, as shown in FIG. 10 , the first main plate 251 of the present embodiment is arranged apart from the first grooved surface 23 by the first protrusion 252 coming into contact with the first grooved surface 23 . During vulcanization molding, the air in the cavity 5 passes through the gap (that is, the first groove 241a) between the first grooved surface 23 and the first main plate 251, and flows through the body of the bead ring 4 in the radial direction. discharged inside.

Referring to FIG. 10 , the second plate member 260 includes a plate-shaped second main plate 261 and a second protrusion 262 that protrudes from the second main plate 261 toward the second groove forming surface 33 . The second main plate 261 of this embodiment is an example of a main plate according to the present invention. Also, the second projecting portion 262 of the present embodiment is an example of a projecting portion according to the present invention. As described above, the surface shape of the second surface 242 of the second plate member 260 of this embodiment is the same as the surface shape of the first surface 241 of the first plate member 250 . Specifically, the arrangement of the second protrusions 262 on the second surface 242 is the same as the arrangement of the first protrusions 252 on the first surface 241 .

The second projecting portion 262 of the present embodiment is formed in a twilled knurl shape. Specifically, the second surface 242 of the present embodiment is provided with a plurality of second grooves 242a (see FIG. 9) extending so as to intersect both the circumferential direction and the depth direction of the exhaust groove 12. there is In other words, the second surface 242 is provided with second grooves 242a in an oblique grid pattern. The plurality of second grooves 242a define the second protrusions 262 of the present embodiment.

In addition, the second main plate 261 of the present embodiment is arranged away from the second grooved surface 33 by the contact of the second projecting portion 262 with the second grooved surface 33 . During vulcanization molding, the air in the cavity 5 passes through the gap (that is, the second groove 242a) between the second grooved surface 33 and the second main plate 261, and flows radially inward of the main body of the bead ring 4. discharged to

The third embodiment has the same effects as those of the first embodiment.

As described above, specific embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.

For example, in the first to third embodiments, the main body of the bead ring is a split type, but it is not limited to this, and the main body of the bead ring may consist of a single part.

For example, in the first to third embodiments, the exhaust passage was defined by the first ring piece and the second ring piece, but is not limited to this, and is provided so as to penetrate the first ring piece. Alternatively, it may be provided so as to pass through the second ring piece.

For example, in the first to third embodiments, the shim is a split type, but the shim is not limited to this, and the shim may consist of a single part.

REFERENCE SIGNS LIST 1 tire vulcanization mold 2 sector mold 3 side plate 4 bead ring 5 cavity 10 main body 11 bead molding surface 12 exhaust groove 13 exhaust passage 14 work hole 15 cover member 16 fixing means 20 first ring piece 21 side surface molding surface 22 first first Opposing surface 23 First groove forming surface 24 First mating surface 30 Second ring piece 31 Bottom forming surface 32 Second opposing surface 33 Second groove forming surface 34 Second mating surface 35 Passage forming surface 40 Shim 41 First surface 42 Second 2 surface 50 first plate-like member 51 first main plate 52 first protrusion 60 second plate-like member 61 second main plate 62 second protrusion 140 shim 141 first surface 142 second surface 150 first plate-like member 151 second 1 main plate 151a first hole 152 first protrusion 160 second plate-like member 161 second main plate 161a second hole 162 second protrusion 240 shim 241 first surface 241a first groove 242 second surface 242a second groove 250 First plate member 251 First main plate 252 First protrusion 260 Second plate member 261 Second main plate 262 Second protrusion T Pneumatic tire T1 Tread portion T2 Side wall portion T3 Bead portion

Claims (6)

an annular body;
a plate-shaped shim detachably attached to the main body,
The body is
a molding surface for molding the bead of the tire;
and an exhaust groove opened in the molding surface,
The shim is arranged in the exhaust groove,
The shim is
a plate-shaped main plate;
a projection projecting from the main plate toward a groove wall defining the exhaust groove. The main body has a working hole that opens to the cavity side and communicates with the exhaust groove,
2. The bead ring of claim 1, wherein at least a portion of said shim is exposed in said working hole. The shim has a plurality of protrusions,
the plurality of protrusions are arranged side by side in the circumferential direction of the main body,
The bead ring according to claim 1 or 2, wherein the two circumferentially adjacent protrusions are arranged so as to at least partially overlap in the circumferential direction. The bead ring according to any one of claims 1 to 3, wherein the projecting portion is a plate piece partially cut and raised from the main plate. The main plate is provided with a hole,
4. A bead ring according to any one of claims 1 to 3, wherein the protrusion is formed around the hole. 4. The bead ring according to any one of claims 1 to 3, wherein the projection is knurled.

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