Vent piece and tire vulcanization mold equipped with same

Abstract

To provide a vent piece capable of suppressing breakage of a cleaning tool during cleaning of an exhaust hole and a tire vulcanization mold assembled with the same.SOLUTION: A vent piece is attached to an exhaust hole opening at a mold surface of a tire vulcanization mold and is assembled with a cylindrical bearing member attached to the exhaust hole and an oscillation member having an exhaust path and oscillably supported on the bearing member. The tire vulcanization mold is assembled with the mold surface in contact with an external surface of a tire set in a mold cavity and the vent piece attached to the exhaust hole opening at the mold surface.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a vent piece and a tire vulcanization mold equipped with the same. [Background technology]

[0002] A tire vulcanization mold is provided with a large number of exhaust holes on the molding surface that molds the outer surface of the tire. During vulcanization, air between the tire's outer surface and the molding surface is discharged through the exhaust holes, and rubber that flows into the exhaust holes forms rubber protrusions called spews on the tire's outer surface. Patent Document 1 discloses a cylindrical vent piece that is attached to the exhaust holes for purposes such as adjusting the size of the spews. The vent piece is provided with an exhaust passage that connects the cavity of the tire vulcanization mold with the exhaust holes.

[0003] However, spew that has broken off from the tire may remain inside the exhaust hole, and the exhaust hole is periodically cleaned using a rod-shaped cleaning tool. When cleaning an exhaust hole equipped with a vent piece as described above, the cleaning tool is passed through the exhaust passage of the vent piece to clean the exhaust hole. However, because the exhaust passage is narrow relative to the exhaust hole and adjacent exhaust holes may extend in different directions, the cleaning tool may break inside the exhaust passage when cleaning the exhaust hole. As a result, the cleaner must work carefully, and the cleaning work takes time. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-1336 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present disclosure is to provide a vent piece that can prevent a cleaning tool from breaking when cleaning an exhaust hole, and a tire vulcanization mold equipped with the same. [Means for solving the problem]

[0006] The vent piece of the present disclosure is a vent piece that is attached to an exhaust hole that opens on the molding surface of a tire vulcanizing mold, and includes a cylindrical support member that is attached to the exhaust hole, and a swinging member that has an exhaust path and is swingably supported by the support member.

[0007] The tire vulcanizing mold of the present disclosure comprises the molding surface that contacts the outer surface of the tire set in the cavity, and the vent piece that is attached to the exhaust hole that opens on the molding surface. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view schematically illustrating an example of a tire vulcanization mold according to the present disclosure. [Figure 2] Cross-sectional view showing the vent piece according to the first embodiment. [Figure 3] FIG. 4 is a cross-sectional view showing a swinging state of a swinging member of the ventlid according to the embodiment; [Figure 4] Cross-sectional view showing a vent piece according to a second embodiment. [Figure 5] FIG. 4 is a cross-sectional view showing a swinging state of a swinging member of the ventlid according to the embodiment; [Figure 6] FIG. 10 is a cross-sectional view showing a vent piece according to another embodiment. [Figure 7] Cross-sectional view showing a vent piece according to a third embodiment [Figure 8] FIG. 4 is a cross-sectional view showing a swinging state of a swinging member of the ventlid according to the embodiment; [Figure 9] Cross-sectional view showing a vent piece according to a fourth embodiment. [Figure 10] FIG. 4 is a cross-sectional view showing a swinging state of a swinging member of the ventlid according to the embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0009] [Tire curing mold] An example of the configuration of a tire vulcanizing mold 10 will be described below with reference to Fig. 1. Note that in Fig. 1 (as well as Figs. 2 to 10), the dimensional ratios in the drawing do not necessarily match the actual dimensional ratios, and the dimensional ratios between the drawings do not necessarily match either.

[0010] FIG. 1 shows a cross section of a tire curing mold 10 (hereinafter, may be simply referred to as "mold 10") along the tire meridian cross section. The mold 10 in FIG. 1 is in a closed state. A tire T is set with its axial direction facing up and down. In FIG. 1, the left side is the radially outer side of the tire, and the right side is the radially inner side of the tire.

[0011] The mold 10 includes a cavity 15 in which the tire T is set, and a molding surface 1 that comes into contact with the outer surface of the tire T set in the cavity 15. The molding surface 1 is provided with an exhaust hole 16 that connects the inside of the mold 10 (i.e., the cavity 15) to the outside. During vulcanization molding, air is discharged between the outer surface of the tire T and the molding surface 1 through the exhaust hole 16. A vent piece 2 is attached to the exhaust hole 16.

[0012] An example of the material for the forming surface 1 is an aluminum material. This aluminum material is a concept that includes not only pure aluminum-based materials but also aluminum alloys, such as Al-Cu-based, Al-Mg-based, Al-Mg-Si-based, Al-Zn-Mg-based, Al-Mn-based, and Al-Si-based materials.

[0013] The mold 10 includes a tread mold 11 for molding the tread of the tire T, side molds 12 and 13 for molding the sidewalls of the tire T, and bead rings 14 and 14 into which the bead portions of the tire are fitted. The molding surface 1 includes the inner surface of the tread mold 11 and the inner surfaces of the side molds 12 and 13. Although not shown, the inner surface of the tread mold 11 has projections and depressions for forming the tread pattern of the tire. Although FIG. 1 depicts only one exhaust hole 16 opening on the inner surface of the tread mold 11, in reality, a large number of exhaust holes opening on the inner surfaces of the tread mold 11 and the side molds 12 and 13 are provided.

[0014] The vent piece 2 is attached to an exhaust hole 16 that opens on the molding surface 1. In FIG. 1, the vent piece 2 is attached to an exhaust hole 16 that opens on the inner surface of the tread mold 11, but instead of or in addition to this, it is also possible to attach the vent piece 2 to an exhaust hole that opens on the inner surface of the side mold 12 and / or side mold 13. Also, in this embodiment, the mold 10 has a structure including the tread mold 11 and a pair of side molds 12, 13, but this is not limited to this, and for example, the mold structure may be such that the tread mold is divided into two parts, upper and lower, at the center.

[0015] [First embodiment of vent piece] A first embodiment of the ventpiece 2 of the present disclosure will be described with reference to Figures 2 and 3. Figure 2 is a cross-sectional view showing a state in which a ventpiece 2a, which is one form of the ventpiece 2, is attached to an exhaust hole 16. In Figure 2, the downward direction is the molding surface side (cavity side), and the upward direction is the anti-molding surface side (anti-cavity side) (the same applies to Figures 3 to 10).

[0016] 2, the ventlid 2a includes a cylindrical support member 21 that is attached to the exhaust hole 16, and a swinging member 22 that has an exhaust passage 223 and is swingably supported by the support member 21. This allows the swinging member 22 to swing in accordance with the movement of a cleaning tool when a cleaning tool is inserted into the exhaust passage 223 to clean the exhaust hole 16. As a result, it is possible to prevent the cleaning tool from breaking inside the exhaust passage 223. As a result, it is possible to improve the cleaning efficiency of the exhaust hole 16.

[0017] The support member 21 and the swinging member 22 are made of a metal material. The support member 21 and the swinging member 22 are made of a material different from that of the molding surface 1 on which the exhaust holes 16 are formed. In this embodiment, the support member 21 and the swinging member 22 are made of a steel material such as stainless steel, aluminum, or S45C.

[0018] The support member 21 is attached to the exhaust hole 16 by an interference fit. In the area where the support member 21 is attached, the inner surface of the exhaust hole 16 is formed by a cylindrical surface extending with a constant diameter from the molding surface 1 toward the opposite molding surface. The longitudinal direction LD of the support member 21 coincides with the extension direction of the exhaust hole 16. In this embodiment, the inner diameter of the support member 21 is constant along the longitudinal direction LD, but is not limited to this. For example, the inner diameter of the support member 21 may increase toward the opposite molding surface. The outer diameter of the support member 21 is constant along the longitudinal direction LD, but is not limited to this.

[0019] Although not shown in Figure 2, it is preferable that the end face 211 of the support member 21 on the side opposite the molding surface be chamfered on the outer peripheral surface side. This makes it easier to attach the support member 21 (ventlid 2a) to the exhaust hole 16. It is preferable that the end face 212 of the support member 21 on the molding surface side be substantially flush with the molding surface 1. This can prevent unnecessary steps from being formed on the outer surface of the tire.

[0020] The length L1 (from end face 211 to end face 212) of the support member 21 in the longitudinal direction LD is preferably 5 mm or more. This increases the contact area between the support member 21 and the exhaust hole 16, improving the effect of the tight fit. As a result, the support member 21 (ventlid 2a) is prevented from coming off the exhaust hole 16. In this embodiment, the length L1 is, for example, 10 mm.

[0021] The oscillating member 22 is formed in a tubular shape extending along the longitudinal direction LD. In this embodiment, the oscillating member 22 is formed in a cylindrical shape. It is preferable that the outer diameter of the oscillating member 22 becomes smaller toward the side opposite the molding surface. In other words, it is preferable that the oscillating member 22 has a tapered shape toward the side opposite the molding surface. This makes it possible to increase the oscillation angle θ1 (see FIG. 3) of the oscillating member 22. Note that the outer diameter of the oscillating member 22 may be constant along the longitudinal direction LD, for example, or the oscillating member 22 may be formed in a rectangular tubular shape.

[0022] It is preferable that the oscillating member 22 protrudes beyond the support member 21 on the side opposite to the molding surface 1 (the side opposite to the molding surface). That is, it is preferable that the end face 221 of the oscillating member 22 on the side opposite to the molding surface is provided on the side opposite to the molding surface beyond the end face 211 of the support member 21. The protruding length L3 of the oscillating member 22 is preferably 20% or more of the length L1 of the support member 21, and more preferably 40% or more.

[0023] It is preferable that, in a non-swinging state, end face 222 of swinging member 22 on the molding surface side is substantially flush with end face 212 of support member 21 and molding surface 1. This prevents unnecessary steps from being formed on the outer surface of the tire. The non-swinging state is a state in which center line CL2 of swinging member 22 and center line CL1 of vent hole 16 (support member 21) are substantially aligned.

[0024] The length L2 of the swinging member 22 in the longitudinal direction LD (from end face 221 to end face 222) is preferably longer than the length L1 of the support member 21. The length L2 of the swinging member 22 is preferably greater than 10 mm. This makes it possible to prevent rubber from passing through the exhaust path 223 and flowing into the exhaust hole 16 during vulcanization molding. In this embodiment, the length L2 is, for example, 15 mm.

[0025] The exhaust path 223 is a through-hole that passes through the oscillating member 22 in the longitudinal direction LD. The exhaust path 223 communicates with the cavity 15 (see FIG. 1) and the exhaust hole 16. The inner surface of the exhaust path 223 is formed by a cylindrical surface that extends with a constant diameter from the molding surface 1 toward the opposite side to the molding surface.

[0026] The diameter of the exhaust passage 223 (the inner diameter of the swinging member 22) is preferably 0.65 mm or more. This prevents the cleaning tool from becoming easily broken due to a smaller diameter. It also prevents the spew formed in the exhaust passage 223 from becoming thinner, facilitating the removal of the spew after vulcanization molding. The diameter of the exhaust passage 223 is preferably 2.0 mm or less.

[0027] The support member 21 includes a support portion 213 that supports the swingable member 22 so that the swingable member 22 can swing. The support portion 213 is provided on the inner peripheral surface of the support member 21. The support portion 213 is preferably provided on the molding surface side. This allows the swing angle θ1 (see FIG. 3) of the swingable member 22 to be increased.

[0028] The oscillating member 22 includes a supported portion 224 that is supported by the supporting portion 213. The supported portion 224 is provided on the outer peripheral surface of the oscillating member 22. One of the supporting portion 213 and the supported portion 224 is formed in a curved convex shape, and the other is formed in a curved concave shape. In this embodiment, the supporting portion 213 is formed in a curved concave shape, and the supported portion 224 is formed in a curved convex shape, but this is not limiting. The supporting portion 213 may be formed in a curved convex shape, and the supported portion 224 may be formed in a curved concave shape.

[0029] In this embodiment, the support portion 213 is a groove with an arc-shaped cross section formed on the entire inner circumferential surface of the support member 21, and the supported portion 224 is a substantially spherical protrusion protruding from the entire outer circumferential surface of the swinging member 22. This increases the degree of freedom of swinging of the swinging member 22. Note that the above is not limitative, and for example, the support portion 213 may be a pair of curved, concave grooves facing each other across the center line CL1, and the supported portion 224 may be a pair of protrusions that fit into those grooves. In such a case, those grooves (protrusions) are preferably provided along the tire circumferential direction. This is because the angular difference between the extension directions of adjacent exhaust holes 16 in the tire circumferential direction is larger than the angular difference between the extension directions of adjacent exhaust holes 16 in the tire axial direction, and if the angular difference between adjacent exhaust holes 16 is large, it becomes difficult to insert a cleaning tool into the exhaust path 223.

[0030] The supporting portion 213 is preferably slightly larger than the supported portion 224. That is, a gap is provided between the supporting portion 213 and the supported portion 224, and this gap is preferably small. The gap is preferably 0.01 mm to 0.05 mm. This allows the swinging member 22 to swing easily. Furthermore, it is possible to prevent rubber from flowing into this gap during vulcanization molding.

[0031] The swinging member 22 is swingably assembled to the integrally formed support member 21. In this embodiment, the swinging member 22 is inserted from the end face 212 side of the cylindrical support member 21, and the supported portion 224 is fitted into the support portion 213. Note that the support member 21 may be made up of, for example, a plurality of divided pieces.

[0032] The oscillation center CP of the oscillating member 22 is preferably located within a range of 30% or less, and more preferably 20% or less, of the length L1 of the support member 21 from the forming surface 1. This allows the oscillation angle θ1 (see FIG. 3) of the oscillating member 22 to be increased. In this embodiment, the oscillation center CP substantially coincides with the center of curvature of the supporting portion 213 or the center of curvature of the supported portion 224, but is not limited to this.

[0033] Fig. 3 is a cross-sectional view showing the swinging state of the swinging member 22 of the ventlid 2a. As shown in Fig. 3, the swinging member 22 (the longitudinal center line CL2 thereof) swings at a swing angle θ1 with respect to the center line CL1 of the exhaust hole 16. The swing angle θ1 is preferably 1 degree or more, and more preferably 2 degrees or more.

[0034] The cleaning tool used to clean the exhaust hole 16 has a rod-shaped member with a diameter smaller than the exhaust path 223. A cleaner can remove residue accumulated in the exhaust path 223 and the exhaust hole 16 by inserting the cleaning tool into the exhaust path 223. At that time, the swinging member 22 swings in response to the movement of the cleaning tool. This prevents force from being concentrated on one part of the cleaning tool, and prevents the cleaning tool from breaking when cleaning the exhaust hole 16. The cleaning tool is, for example, an electric drill.

[0035] [Second embodiment of vent piece] Next, a second embodiment of the ventlid 2 of the present disclosure will be described with reference to Figures 4 and 5. A ventlid 2b as the second embodiment can be configured similarly to the ventlid 2a as the first embodiment except for the configuration described below, so commonalities will be omitted and differences will be mainly described. Configurations already described in the first embodiment will be assigned the same reference numerals and duplicate explanations will be omitted.

[0036] Fig. 4 is a cross-sectional view showing a ventlid 2b according to the second embodiment, and Fig. 5 is a cross-sectional view showing the swinging state of swinging member 22 of ventlid 2b. As shown in Figs. 4 and 5, swinging member 22 is supported by support member 21 via elastic annular member 23. Elastic annular member 23 is, for example, an O-ring made of an elastic material with excellent heat resistance (for example, fluororubber or silicone rubber).

[0037] The supported portion 224 has a groove 225 into which the elastic annular member 23 is fitted. The groove 225 is preferably provided at the apex of the supported portion 224, which is formed in a curved convex shape. The gap between the supporting portion 213 and the supported portion 224 is preferably minimized on the molding surface side. This makes it possible to reduce the amount of rubber that flows into the gap during vulcanization molding.

[0038] The ventlid 2b according to the second embodiment is not limited to the above. For example, as shown in Fig. 6, the supported portion 224 of the ventlid 2b may be formed in a curved concave shape. In such a configuration, the supported portion 224 becomes a groove 225 into which the elastic annular member 23 is fitted.

[0039] [Third embodiment of vent piece] Next, a third embodiment of the ventlid 2 of the present disclosure will be described with reference to Figures 7 and 8. A ventlid 2c as the third embodiment can be configured similarly to the ventlid 2a as the first embodiment, except for the configuration described below, so commonalities will be omitted and differences will be mainly described. Configurations already described in the first embodiment will be assigned the same reference numerals, and duplicate explanations will be omitted.

[0040] Fig. 7 is a cross-sectional view showing a ventlid 2c according to the third embodiment, and Fig. 8 is a cross-sectional view showing the swinging state of the swinging member 22 of the ventlid 2c. As shown in Figs. 7 and 8, the support member 21 includes a cylindrical main body portion 214 that is attached to the exhaust hole 16, and an elastic member 215 that is provided between the main body portion 214 and the swinging member 22 and supports the swinging member 22. In this embodiment, the inner circumferential surface of the elastic member 215 corresponds to the supporting portion 213 of the first embodiment, and the outer circumferential surface of the swinging member 22 corresponds to the supported portion 224 of the first embodiment.

[0041] The elastic member 215 is formed of an elastic material having excellent heat resistance (for example, a resin such as polyurethane resin or silicone resin, or a rubber such as fluororubber or silicone rubber). The elastic member 215 connects the inner circumferential surface of the main body portion 214 and the outer circumferential surface of the oscillating member 22. In this embodiment, the elastic member 215 is formed in a cylindrical shape. This makes it possible to prevent rubber from flowing between the main body portion 214 and the oscillating member 22 toward the side of the elastic member 215 that is opposite the molding surface during vulcanization molding. The elastic member 215 may be formed in a spiral shape, for example.

[0042] The length L4 of the elastic member 215 in the longitudinal direction LD is preferably 5 mm or more. This makes it possible to prevent the connection between the main body portion 214 and the swinging member 22 from being released. In this embodiment, the length L4 of the elastic member 215 is substantially the same as the length L1 of the support member 21. The length L4 is, for example, 10 mm. The thickness of the elastic member 215 is substantially the same as the thickness of the main body portion 214 and is also substantially the same as the thickness of the swinging member 22. Note that the elastic member 215 is not limited to the above.

[0043] It is preferable that the end face 215a on the molding surface side of the elastic member 215 is substantially flush with the end face 214a on the molding surface side of the main body portion 214 and the end face 222 of the swinging member 22 in a non-swinging state. This can prevent unnecessary steps from being formed on the outer surface of the tire T. Also, it can prevent rubber from flowing between the main body portion 214 and the swinging member 22 during vulcanization molding.

[0044] In this embodiment, the thicknesses of the main body 214, the elastic member 215, and the swinging member 22 are constant along the longitudinal direction LD, and are substantially the same. The outer diameter of the swinging member 22 is constant along the longitudinal direction LD. The swing center CP in FIG. 8 is an example, and changes depending on the contact position between the swinging member 22 and the cleaning tool. Note that the main body 214, the elastic member 215, and the swinging member 22 are not limited to those described above.

[0045] [Fourth embodiment of vent piece] Next, a fourth embodiment of the ventlid 2 of the present disclosure will be described with reference to Figures 9 and 10. A ventlid 2d as the fourth embodiment can be configured similarly to the ventlid 2a as the first embodiment, except for the configuration described below, so commonalities will be omitted and differences will be mainly described. Configurations already described in the first embodiment will be assigned the same reference numerals, and duplicate explanations will be omitted.

[0046] Fig. 9 is a cross-sectional view showing a ventlid 2d according to the fourth embodiment, and Fig. 10 is a cross-sectional view showing the swinging state of the swinging member 22 of the ventlid 2d. As shown in Figs. 9 and 10, the support member 21 is made of an elastic material with excellent heat resistance (for example, a resin such as polyurethane resin or silicone resin, or a rubber such as fluororubber or silicone rubber). In this embodiment, the inner circumferential surface of the support member 21 corresponds to the supporting portion 213 of the first embodiment, and the outer circumferential surface of the swinging member 22 corresponds to the supported portion 224 of the first embodiment.

[0047] In this embodiment, the thickness of each of the support member 21 and the swinging member 22 is constant along the longitudinal direction LD. The thickness of the support member 21 is smaller than the thickness of the swinging member 22. The outer diameter of the swinging member 22 is constant along the longitudinal direction LD. The swing center CP in FIG. 10 is an example and changes depending on the contact position between the swinging member 22 and the cleaning tool. Note that the support member 21 and the swinging member 22 are not limited to those described above.

[0048] [1] As described above, the vent piece 2 of the present disclosure is a vent piece 2 that is attached to the exhaust hole 16 that opens on the molding surface 1 of the tire vulcanizing mold 10, and includes a cylindrical support member 21 that is attached to the exhaust hole 16, and a swinging member 22 that has an exhaust path 223 and is swingably supported by the support member 21.

[0049] With this configuration, when a cleaning tool is inserted into exhaust passage 223 from the molding surface side, swinging member 22 can be swung to follow the movement of the cleaning tool. This prevents force from concentrating on one part of the cleaning tool, and prevents the cleaning tool from breaking when cleaning exhaust hole 16. As a result, the cleaning efficiency of exhaust hole 16 can be improved.

[0050] [2] It is preferable that the swinging member 22 in the ventlid 2 of the above [1] be configured to protrude beyond the support member 21 on the side opposite to the molding surface 1 (opposite the molding surface side).

[0051] With this configuration, the swing angle θ1 of the swing member 22 can be increased compared to a ventlid in which the position of the end face 221 of the swing member 22 is the same and the swing member 22 does not protrude further toward the opposite side of the molding surface than the support member 21. This increases the effectiveness of preventing the cleaning tool from bending when cleaning the exhaust hole 16. In addition, the end face 221 of the swing member 22 on the opposite side of the molding surface can be moved away from the swing center CP. This makes it easier for the swing member 22 to swing along with the cleaning tool, increasing the effectiveness of preventing the cleaning tool from bending when cleaning the exhaust hole 16.

[0052] [3] In the vent piece 2 of [1] or [2] above, the support member 21 may have a support portion 213 that supports the oscillating member 22 so that the oscillating member 22 can oscillate, and the oscillating member 22 may have a supported portion 224 that is supported by the support portion 213, and one of the support portion 213 and the supported portion 224 may be formed in a curved convex shape, and the other may be formed in a curved concave shape.

[0053] According to this configuration, by fitting one of the supporting portion 213 and the supported portion 224 into the other, the swinging member 22 can be swung relative to the supporting member 21. Furthermore, for example, the gap between the supporting portion 213 and the supported portion 224 can be made small, which can prevent rubber from flowing into the gap during vulcanization molding.

[0054] [4] In the ventlid 2 of any one of the above [1] to [3], the swinging member 22 may be configured to be supported by the support member 21 via an elastic annular member 23.

[0055] According to this configuration, the oscillating member 22 can be oscillated by the elastic annular member 23. Furthermore, during vulcanization molding, it is possible to prevent rubber from flowing between the support member 21 and the oscillating member 22 toward the side of the elastic annular member 23 opposite the molding surface.

[0056] [5] In the vent piece 2 of [1] or [2] above, it is preferable that the support member 21 comprises a cylindrical main body 214 that is attached to the exhaust hole 16, and an elastic member 215 that is provided between the main body 214 and the oscillating member 22 and supports the oscillating member 22.

[0057] According to this configuration, the elastic deformation of the elastic member 215 can cause the swinging member 22 to swing. Furthermore, by covering the elastic member 215 with the main body 214, it is possible to prevent the elastic member 215 from being damaged by the edge of the molding surface 1 when the ventlid 2 is attached.

[0058] [6] In the ventlid 2 of the above [1] or [2], the support member 21 may be configured to be made of an elastic material.

[0059] According to this configuration, the supporting member 21 is elastically deformed, so that the swinging member 22 can be swung.

[0060] [7] The tire vulcanizing mold 10 of the present disclosure comprises a molding surface 1 that comes into contact with the outer surface of the tire T set in the cavity 15, and a vent piece 2 selected from any one of [1] to [6] above that is attached to an exhaust hole 16 that opens on the molding surface 1.

[0061] With this configuration, when a cleaning tool is inserted into exhaust passage 223 from the molding surface side, swinging member 22 can be swung to follow the movement of the cleaning tool. This prevents force from concentrating on one part of the cleaning tool, and improves the effect of preventing the cleaning tool from breaking when cleaning exhaust hole 16.

[0062] Although the embodiments of the present disclosure have been described above, it should be understood that the specific configurations are not limited to these embodiments. The scope of the present disclosure is not limited to the above-described embodiments, but is indicated by the claims, and further includes all modifications within the meaning and scope equivalent to the claims.

[0063] The ventlid 2 and tire vulcanizing mold 10 of the present disclosure are not limited to the above-described embodiments, and various improvements and modifications are possible without departing from the spirit thereof. Furthermore, the configurations adopted in the first to fourth embodiments described above can be adopted in any combination. [Explanation of symbols]

[0064] 1...molding surface, 2...vent piece, 10...tire vulcanization mold, 11...tread mold, 12, 13...side mold, 14...bead ring, 15...cavity, 16...exhaust hole, 21...support member, 213...support portion, 214...main body portion, 215...elastic member, 22...oscillating member, 223...exhaust path, 224...supported portion, 225...groove, 23...elastic annular member, T...tire

Claims

1. A vent piece attached to an exhaust hole opening on the molding surface of a tire vulcanization mold, a cylindrical support member attached to the exhaust hole; A vent piece comprising: a swinging member having an exhaust path and supported by the support member so as to be swingable.

2. The ventlid according to claim 1, wherein the swinging member protrudes beyond the support member on a side opposite to the molding surface.

3. the support member includes a support portion that supports the swinging member so that the swinging member can swing; the swinging member includes a supported portion supported by the supporting portion, The ventlid according to claim 1, wherein one of the supporting portion and the supported portion is formed in a curved convex shape, and the other is formed in a curved concave shape.

4. 2. The ventlid according to claim 1, wherein the swinging member is supported by the support member via an elastic annular member made of an elastic material.

5. 2. The ventlid according to claim 1, wherein the support member comprises: a cylindrical main body attached to the exhaust hole; and an elastic member provided between the main body and the swinging member and supporting the swinging member.

6. The vent piece according to claim 1 , wherein the support member is made of an elastic material.

7. The molding surface contacts the outer surface of the tire set in the cavity; A tire vulcanizing mold comprising: the vent piece according to any one of claims 1 to 6, which is attached to the exhaust hole opening on the molding surface.

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