Tire vulcanizing device

Abstract

The present invention provides a tire vulcanizing device, which is provided with: a sector that holds a sector for forming a tread surface; and a container ring provided on the outer side of the sector in the tire radial direction and provided with a groove extending in the vertical direction on the outer side of the sector in the tire radial direction, the container ring being provided with: an engagement pin that engages with the groove during mold opening; the engagement pin is fixed to the insertion hole by means of a bolt, and at least a lower portion of an outer peripheral surface of the engagement pin is provided with a first pin-side step which expands in diameter at a position separated from an outer end of the engagement pin in a tire radial direction in an axial direction of the engagement pin, and a second pin-side step which expands in diameter at a position separated from an outer end of the engagement pin in a tire radial direction in the axial direction of the engagement pin is provided at a lower portion of the outer peripheral surface of the engagement pin. The embedding hole is provided with a hole side step corresponding to the first pin side step.

Description

Technical Field

[0001] The present disclosure relates to a tire vulcanizing device. Background Art

[0002] Regarding a tire vulcanizing device for vulcanizing an unvulcanized tire, it includes: a sector body, with a sector member installed on the inner peripheral side; and a container ring, which is disposed on the outer peripheral side of the sector body (for example, Patent Document 1). Conical surfaces with the same inclination are formed on the outer peripheral surface of the sector body and the inner peripheral surface of the container ring that slides together with it. These conical surfaces are each inclined downward and radially outward of the tire. Thus, as the container ring moves up and down, the sector member is movable in the tire radial direction.

[0003] A groove extending in the vertical direction is provided on the outer peripheral side of the sector body, and a cylindrical engagement pin is provided on the container ring. The engagement pin engages with the groove when the mold is opened. By engaging the engagement pin with the groove, the sector member and the sector body are lifted when the container ring rises. At this time, a load of the sector body including the sector member is applied to the engagement pin.

[0004] If the tire vulcanizing mold is repeatedly opened and closed, as shown in Figure 8 (a) thereof, the engagement pin 932 is gradually deformed by the load F9 of the sector body including the sector member, and as shown in Figure 8 (b) thereof, a gap G9 is generated between the engagement pin 932 and the insertion hole 933. Moreover, if the tire vulcanizing mold is further repeatedly opened and closed, the engagement pin 932 is gradually inclined in the insertion hole 933 by the load F9, as shown in Figure 8 (c) thereof, and stress is concentrated on a part of the bolt B9 that fixes the engagement pin 932 ( Figure 8 the circled part X9 in (c) thereof). If stress is concentrated on a part of the bolt B9, there is a possibility that the bolt B9 breaks and the engagement pin 932 falls off from the insertion hole 933.

[0005] Prior Art Documents Patent Documents Patent Document 1: Japanese Unexamined Patent Application Publication No. 2018-27633 [[ID=u30]] Summary of the Invention

[0006] Problems to be Solved by the Invention An object of the present disclosure is to provide a tire vulcanizing device that can suppress breakage of a bolt fixing an engagement pin.

[0007] Technical Solution for Solving the Problems The tire vulcanizing device of the present disclosure includes: a sector body that holds a segment for forming a tread surface; and a container ring provided on the radially outer side of the sector body in the tire radial direction. A groove extending in the vertical direction is provided on the radially outer side of the sector body in the tire radial direction. The container ring includes: a engaging pin that engages with the groove when the mold is opened; and an insertion hole into which the engaging pin is inserted. The engaging pin is fixed to the insertion hole by a bolt. At least the lower part of the outer peripheral surface of the engaging pin is provided with a first pin-side step that expands in diameter at a position away from the radially outer end of the engaging pin in the axial direction of the engaging pin. A hole-side step corresponding to the first pin-side step is provided in the insertion hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 FIG. is a schematic cross-sectional view along the tire meridian plane showing a tire vulcanizing device according to an embodiment.

[0009] Figure 2 FIG. is a cross-sectional view showing the state after expanding the segment, corresponding to Figure 1

[0010] Figure 3 FIG. is a cross-sectional view showing the state after raising the segment, corresponding to Figure 1

[0011] Figure 4 FIG. is an enlarged cross-sectional view of the Figure 1 engaging pin.

[0012] Figure 5 FIG. is a view showing the state of applying a load of the sector body including the segment to the engaging pin.

[0013] Figure 6 FIG. is an enlarged cross-sectional view of the engaging pin of a tire vulcanizing device according to another embodiment.

[0014] Figure 7 FIG. is an enlarged cross-sectional view of the engaging pin of a tire vulcanizing device according to another embodiment.

[0015] Figure 8 FIG. is a view showing the state of applying a load of the sector body including the segment to the engaging pin of an existing example. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] With reference to Figure 1 FIG., an example of the structure of a tire vulcanizing device 100 (hereinafter sometimes simply referred to as "vulcanizing device 100") that vulcanizes an unvulcanized tire will be described. In addition, in each figure ( Figures 2 to 8 the same applies), the dimensional ratio of the drawings does not necessarily match the actual dimensional ratio, and furthermore, the dimensional ratios between the respective drawings do not necessarily match.​​

[0017] In each figure, the first direction D1 is the tire axial direction D1 parallel to the tire rotation axis of the pneumatic tire T (hereinafter, also simply referred to as "tire T"), and the second direction D2 is the diameter direction of the tire T, i.e., the tire radial direction D2. The direction around the tire rotation axis is referred to as the tire circumferential direction.

[0018] In the tire radial direction D2, the inner side is the side closer to the tire rotation axis, and the outer side is the side farther from the tire rotation axis. The tire meridian section is a section including the tire rotation axis and orthogonal to the tire equatorial plane, and the tire equatorial plane is a plane orthogonal to the tire rotation axis and located at the center of the tire axial direction D1 of the tire T.

[0019] Figure 1 is a diagram schematically showing a section of the vulcanizing device 100 along the tire meridian section. The vulcanizing device 100 includes a tire vulcanization mold 1 (hereinafter, sometimes simply referred to as "vulcanization mold 1"). In Figure 1 it, the vulcanization mold 1 is in the closed mold state, and the tire T (uncured tire) is placed with the tire axial direction D1 facing up and down.

[0020] The vulcanization mold 1 includes: a tread mold 11 that forms the tread of the tire T; an upper sidewall mold 12 and a lower sidewall mold 13 that form the sidewall of the tire T; and bead wires 14 and 15 for fitting the bead portion of the tire T.

[0021] The tread mold 11 is composed of a plurality of fan-shaped pieces 11a divided in the tire circumferential direction, and in the closed mold state, these fan-shaped pieces are gathered and connected into a ring shape. The vulcanization mold 1 according to the present embodiment is a split mold including such a split type tread mold 11.

[0022] The vulcanization mold 1 includes a tire forming surface 16 that contacts the outer surface of the placed tire T. The tire forming surface 16 includes the inner surface of the tread mold 11 and the inner surfaces of the sidewall molds 12 and 13. Although not shown in the figure, irregularities for forming the tread pattern of the tire T are provided on the inner surface of the tread mold 11.

[0023] The vulcanization mold 1 includes vent holes (not shown) that discharge air between the outer surface of the uncured tire and the tire forming surface 16 during vulcanization molding. The vent holes are also referred to as exhaust holes and are formed by opening on the tire forming surface 16.

[0024] The vulcanizing device 100 includes an unillustrated exhaust line communicating with the vent holes. During vulcanization molding, the excess air between the outer surface of the uncured tire and the tire forming surface 16 is discharged to the outside through the vent holes via the exhaust line.

[0025] The vulcanizing device 100 includes: a segment 2 that holds a segment member 11a (tire tread mold 11); and a container ring 3 that is provided on the outer side in the tire radial direction D2 of the segment 2. A plurality of segments 2 are provided corresponding to the respective segment members 11a. The portion on the outer side in the tire radial direction D2 of the segment 2 and the portion on the inner side in the tire radial direction D2 of the container ring 3 face downward and incline outward in the tire radial direction D2. By raising and lowering the container ring 3, these portions slide, and the segment member 11a is movable in the tire radial direction D2. Details of the segment 2 and the container ring 3 will be described later.

[0026] The vulcanizing device 100 includes: an upper platen (not shown) that supports the upper sidewall mold 12; a lower platen 4 that supports the lower sidewall mold 13; and an arm (not shown) that supports the container ring 3. The upper platen is configured to be able to be raised and lowered, and the segment 2 is supported on the lower surface of the upper platen so as to be slidable along the tire radial direction D2. The arm is mounted on a guide member (not shown) so as to be able to be raised and lowered, and the guide member is erected on the upper surface of the upper platen. By the relative raising and lowering of the arm with respect to the guide member, the container ring 3 is raised and lowered relative to the segment 2.

[0027] The vulcanizing device 100 includes: a tire vulcanizing bladder 5 (hereinafter sometimes simply referred to as "bladder 5"), which is a rubber bag; a center mechanism 6 that is provided at the center of the vulcanizing mold 1; and a supply line and a discharge line (not shown) that communicate with the inside of the bladder 5.

[0028] The bladder 5 is disposed inside an unvulcanized tire (tire T) placed in the vulcanizing mold 1. The bladder 5 expands and deforms by supplying a high-temperature and high-pressure vulcanizing medium from the supply line, and contracts and deforms by discharging the vulcanizing medium filled in its inside to the discharge line. The bladder 5 is supported by the center mechanism 6. Specifically, the upper end portion of the bladder 5 is supported by the upper clamping member 61 of the center mechanism 6, and the lower end portion of the bladder 5 is supported by the lower clamping member 62 of the center mechanism 6.

[0029] The vulcanization molding of the tire T is performed in Figure 1 the closed mold state shown. A heat source Hs such as an electric heater and a steam jacket is provided inside the container ring 3, and by heating the container ring 3, the vulcanizing mold 1 is heated by the segment 2. By the heated vulcanizing mold 1 and the high-temperature and high-pressure vulcanizing medium, the tire T is heated and vulcanization molding is performed. After the vulcanization molding is completed, the segment member 11a is expanded in diameter (refer to Figure 2 ), and the segment member 11a is raised to be transferred to the open mold state (refer to Figure 3 ). Figure 2 is a cross-sectional view corresponding to Figure 1 showing the state after the segment member 11a is expanded in diameter, Figure 3 is a cross-sectional view corresponding to showing the state after the segment member 11a is raised,Figure 1 Cross-sectional view. In Figure 3 , the state after only the sector piece 11a is lifted is depicted. However, in actuality, when the mold is opened, the upper side wall mold 12 and the bead wire 14 also rise together with the sector piece 11a.

[0030] The center mechanism 6 includes a center column 63 that extends in the vertical direction (tire axial direction D1) at the center of the vulcanizing mold 1. The center column 63 is arranged to be spaced apart from the vulcanizing mold 1 toward the inner side in the tire radial direction D2. An upper clamping member 61 and a lower clamping member 62 are mounted on the center column 63. At least a part of each of the upper clamping member 61 and the lower clamping member 62 is configured to be detachable from and attachable to the center column 63 together with the airbag 5.

[0031] The sector body 2 includes: a sector body side conical surface 21 that faces downward and is inclined outward in the tire radial direction D2; and a sliding member 22 that slides with the container ring 3. The sector body side conical surface 21 is provided on the outer peripheral side (outer side in the tire radial direction D2) of the sector body 2, and the sliding member 22 is provided on the sector body side conical surface 21. The sliding member 22 extends in the vertical direction.

[0032] A groove 23 that extends in the vertical direction is provided on the outer side in the tire radial direction D2 of the sector body 2. In the present embodiment, the groove 23 is provided on the sliding member 22. In the extending direction of the groove 23, the upper end of the groove 23 is closed, and the lower end of the groove 23 is open.

[0033] The container ring 3 includes: a container ring side conical surface 31 (hereinafter, sometimes simply referred to as "conical surface 31") that faces downward and is inclined outward in the tire radial direction D2; a locking pin 32 that engages with the groove 23 (upper end) when the mold is opened (when the container ring 3 rises); and an insertion hole 33 into which the locking pin 32 is inserted. The locking pin 32 is fixed to the insertion hole 33 by a bolt B1.

[0034] The conical surface 31 is inclined in the same direction as the sector body side conical surface 21. In the present embodiment, the conical surface 31 slides with the sliding member 22 provided on the sector body side conical surface 21, so that the sector piece 11a can move freely in the tire radial direction D2.

[0035] Figure 4 Is an enlarged Figure 1 of the locking pin 32 after Figure 4As shown, the engagement pin 32 is inserted into the insertion hole 33, and a part thereof (the engagement portion 322 described later) protrudes from the tapered surface 31. In the present embodiment, the engagement pin 32 is inserted into the insertion hole 33 up to the bottom surface 33a of the insertion hole 33 along the central axis CL1 direction of the engagement pin 32. The central axis CL1 of the engagement pin 32 in the inserted state substantially coincides with the central axis of the insertion hole 33. The engagement pin 32 is preferably formed in a substantially cylindrical shape. Thus, compared with the case where the engagement pin 32 is formed in a rectangular parallelepiped shape or the like, the engagement between the engagement pin 32 and the groove 23 can be performed more smoothly. This is because, when the engagement pin 32 has a shape with an edge such as a rectangular parallelepiped shape, the edge may interfere with the groove 23. It should be noted that the engagement pin 32 is not limited to the above, and may be formed in a rectangular parallelepiped shape, an elliptical cylindrical shape, a semi-cylindrical shape, or the like.

[0036] The insertion hole 33 is provided on the lower side of the container ring 3 and opens on the tapered surface 31. The insertion hole 33 is a hole extending along the tire radial direction D2 from the tapered surface 31. In the present embodiment, the insertion hole 33 is a hole extending in a direction orthogonal to the tapered surface 31. The insertion hole 33 is formed in a shape capable of inserting the engagement pin 32. The insertion hole 33 is preferably formed in a substantially cylindrical shape.

[0037] On at least the lower part of the outer peripheral surface of the engagement pin 32, a first pin-side step 321 (hereinafter, sometimes simply referred to as "pin-side step 321") that expands in diameter at a position away from the axis (central axis CL1) of the engagement pin 32 from the outer end 32a of the engagement pin 32 in the tire radial direction D2 is provided. A hole-side step 331 corresponding to the pin-side step 321 is provided in the insertion hole 33. That is, on at least the lower part of the side wall surface of the insertion hole 33, a hole-side step 331 that expands in diameter at a position away from the bottom surface 33a of the insertion hole 33 in the axial direction of the insertion hole 33 is provided. According to the relevant structure, when the upper part of the engagement pin 32 is engaged with the groove 23 and a load of the fan-shaped body 2 including the sector member is applied in the downward direction (hereinafter, sometimes simply referred to as "load of the fan-shaped body 2"), the pin-side step 321 provided at the lower part of the engagement pin 32 contacts the hole-side step 331 provided in the insertion hole 33, and the inclination of the engagement pin 32 in the insertion hole 33 can be suppressed. Thus, stress concentration on a part of the bolt B1 can be suppressed, and breakage of the bolt B1 can be suppressed. In addition, compared with the existing example, since the bolt B1 is less likely to break, it is easy for maintenance personnel to find the inclination of the engagement pin 32 in the insertion hole 33 before the bolt B1 breaks.

[0038] Specifically, if the vulcanization mold is repeatedly opened and closed, then as shown in (a) of Figure 5 the engagement pin 32 is gradually deformed by the load F1 of the fan-shaped body 2, as shown in Figure 5As shown in (b), a gap G1 is generated between the engagement pin 32 and the insertion hole 33. At this time, due to the load F1 of the fan-shaped body 2, a force (torque) for rotation around the lower part of the engagement pin 32 (near the opening of the insertion hole 33) as a fulcrum is generated. However, by the contact between the pin-side step 321 and the hole-side step 331, the contact between the upper part of the engagement pin 32 ( Figure 5 the circled part Y in (b)) and the insertion hole 33 can be alleviated. Thereby, the deformation of the upper part of the engagement pin 32 caused by the load F1 of the fan-shaped body 2 can be suppressed. In addition, as Figure 5 shown in (c), after the gap G1 is generated between the engagement pin 32 and the insertion hole 33, by the contact between the pin-side step 321 and the hole-side step 331, the situation where the engagement pin 32 tilts in the insertion hole 33 can also be suppressed. Thereby, the stress concentration on a part of the bolt B1 that fixes the engagement pin 32 ( Figure 5 the circled part X1 in (c)) can be suppressed, and the breakage of the bolt B1 can be suppressed.

[0039] The pin-side step 321 (the surface) faces the outside in the tire radial direction D2. The hole-side step 331 (the surface) faces the inside in the tire radial direction D2 (the fan-shaped body 2 side). The outer end 32a of the engagement pin 32 preferably contacts the bottom surface 33a of the insertion hole 33.

[0040] The pin-side step 321 is preferably provided on the entire circumference of the outer peripheral surface of the engagement pin 32. The hole-side step 331 is preferably provided on the entire circumference of the side wall surface of the insertion hole 33. According to the relevant structure, the contact amount between the pin-side step 321 and the hole-side step 331 increases, and the situation where the engagement pin 32 tilts in the insertion hole 33 due to the load of the fan-shaped body 2 can be further suppressed. In addition, by providing the steps 321 and 331 on the entire circumference, the processing of the steps 321 and 331 becomes easy.

[0041] As Figure 4 shown, the length L1 from the outer end 32a of the engagement pin 32 to the pin-side step 321 is preferably 50% or less of the length L2 in the central axis CL1 direction of the engagement pin 32. That is, the pin-side step 321 is preferably provided at a position closer to the outside in the tire radial direction D2 than the center of the engagement pin 32 in the central axis CL1 direction. Thereby, the reduction in the strength of the engagement pin 32 caused by the provision of the pin-side step 321 can be suppressed. The length L1 is more preferably 40% or less of the length L2, further preferably 30% or less of the length L2, and particularly more preferably 20% or less of the length L2.

[0042] The length L3 from the bottom surface 33a of the insertion hole 33 to the hole-side step 331 is preferably 50% or less of the depth Dp of the insertion hole 33. The length L3 is more preferably 40% or less of the depth Dp, and further preferably 30% or less of the depth Dp.

[0043] The radial width W1 of the engaging pin 32 at the pin-side step 321 is preferably 1 mm or more. Thereby, the contact amount between the pin-side step 321 and the hole-side step 331 can be ensured. The width W1 is more preferably 2 mm or more. The same applies to the width of the hole-side step 331.

[0044] The angle formed by the pin-side step 321 and the diameter-expanded surface 32b of the engaging pin 32 θ 1 is preferably 70 degrees or more, more preferably 80 degrees or more, and further preferably 85 degrees or more. The angle θ 1 is preferably 110 degrees or less, more preferably 100 degrees or less, and further preferably 95 degrees or less. In the present embodiment, the angle θ 1 is 90 degrees, but is not limited thereto. The same applies to the angle formed by the hole-side step 331 and the side wall surface of the insertion hole 33.

[0045] The engaging pin 32 has an engaging portion 322 that engages with the groove 23 (upper end). The engaging portion 322 is a portion of the engaging pin 32 that protrudes from the insertion hole 33 (conical surface 31). In the present embodiment, a second pin-side step 323 is provided on the entire circumference of the outer peripheral surface of the engaging pin 32, and the second pin-side step 323 is reduced in diameter between the first pin-side step 321 and the inner end 32c of the engaging pin 32 in the tire radial direction D2. By providing the second pin-side step 323, the outer diameter Dm3 of the engaging portion 322 can be matched with the outer diameter of the existing engaging pin, and the existing fan-shaped body 2 can be directly used. The second pin-side step 323 is provided at a position away from the inner end 32c side of the engaging pin 32 in the axial direction (central axis CL1) of the engaging pin 32 from the first pin-side step 321. It should be noted that, without being limited to the above description, the second pin-side step 323 may not be provided on the engaging pin 32.

[0046] The second pin-side step 323 is provided at a position closer to the fan-shaped body 2 than the first pin-side step 321, and the engaging portion 322 is provided at a position closer to the fan-shaped body 2 than the second pin-side step 323. Preferably, the second pin-side step 323 is provided substantially coplanar with the conical surface 31, or is provided at a position closer to the side opposite to the fan-shaped body 2 (outer side in the tire radial direction D2) than the conical surface 31. Thereby, contact between the second pin-side step 323 and the fan-shaped body 2 (sliding member 22) can be prevented when engaging with the groove 23.

[0047] The length L4 of the engaging pin 32 from the inner end 32c in the tire radial direction D2 to the second pin-side step 323 (the length L4 of the engaging portion 322) is greater than the length L1 of the engaging pin 32 from the outer end 32a to the first pin-side step 321. The length L4 of the engaging portion 322 is, for example, 1.5 times or more and 2.5 times or less the length L1. In the present embodiment, the length L4 of the engaging portion 322 is 2 times the length L1, but is not limited thereto.

[0048] The outer diameter Dm1 of the outer end 32a of the engagement pin 32 is smaller than the outer diameter Dm2 of the enlarged diameter surface 32b of the engagement pin 32. The outer diameter Dm1 of the outer end 32a is substantially the same as the outer diameter Dm3 of the inner end 32c (engagement portion 322) of the engagement pin 32. The length L2 of the engagement pin 32 is larger than the minimum diameter (outer diameter Dm1, outer diameter Dm3) of the engagement pin 32. The length L2 of the engagement pin 32 is smaller than the maximum diameter (outer diameter Dm2) of the engagement pin 32.

[0049] The engagement pin 32 is fixed to the insertion hole 33 by a bolt B1. The nominal diameter of the bolt B1 is preferably 50% or more of the minimum diameter (outer diameter Dm1) of the engagement pin 32. According to the relevant structure, the fixing force of the engagement pin 32 relative to the insertion hole 33 can be improved, and the loosening of the bolt B1 can be suppressed. Thereby, the stress concentration on a part of the bolt B1 can be suppressed, and the bolt B1 can be prevented from breaking due to the load of the sector body 2. In the present embodiment, the nominal diameter of the bolt B1 is M16, but it is not limited thereto.

[0050] The threaded portion of the bolt B1 is arranged to face the sector body 2 side. The protruding amount of the threaded portion of the bolt B1 from the conical surface 31 toward the sector body 2 side is preferably 1 mm or less. According to the relevant structure, the bolt B1 can be prevented from breaking due to the shearing force when the engagement pin 32 engages with the groove 23. In the present embodiment, the threaded portion of the bolt B1 does not protrude from the conical surface 31 toward the sector body 2 side. That is, the inner end of the bolt B1 on the tire radial D2 side is arranged at a position more on the side opposite to the sector body 2 (the outer side of the tire radial D2) than the conical surface 31.

[0051] The safety factor of the bolt B1 with respect to the load of the sector body 2 is preferably 3 times or more. For example, when the protruding amount of the threaded portion of the bolt B1 from the conical surface 31 toward the sector body 2 side is 1 mm, the weight of the sector body 2 including the sector member is 80 kg to 110 kg, and the safety factor is 25, the required nominal diameter for preventing the bolt B1 (material: SCM435) from bending is 4.8 mm to 5.3 mm. The required nominal diameter is calculated, for example, based on the bending torque, bending stress, safety factor, and section modulus. In the present embodiment, the nominal diameter of the bolt B1 is 3 times to 3.3 times the required nominal diameter calculated above.

[0052] The engaging pin 32 has an internal thread 324 that is screwed onto the bolt B1. The central axis CL2 of the bolt B1 (the central axis of the internal thread 324) is preferably offset from the central axis CL1 of the engaging pin 32. Thereby, when the engaging pin 32 is fixed to the insertion hole 33 using the bolt B1, rotation of the engaging pin 32 within the insertion hole 33 can be suppressed. Preferably, the central axis CL2 of the bolt B1 (the central axis of the internal thread 324) is provided at a position above the central axis CL1 of the engaging pin 32. Thereby, the strength of the lower side of the engaging pin 32 can be increased, and deformation of the pin-side step 321 due to contact with the hole-side step 331 can be suppressed. In the present embodiment, the central axis CL2 of the bolt B1 and the central axis CL1 of the engaging pin 32 are substantially parallel.

[0053] The protruding amount Ap of the internal thread 324 from the tapered surface 31 toward the fan-shaped body 2 is preferably 1 mm or less. According to the relevant structure, a decrease in the strength of the engaging pin 32 caused by the provision of the internal thread 324 can be suppressed, and deformation and breakage of the engaging pin 32 during engagement with the groove 23 can be suppressed.

[0054] The screwing length of the internal thread 324 and the bolt B1 is preferably 50% or more of the length L2 of the engaging pin 32. Thereby, the fixing force of the engaging pin 32 with respect to the insertion hole 33 can be increased, and loosening of the bolt B1 can be suppressed. As a result, stress concentration on a part of the bolt B1 can be suppressed, and breakage of the bolt B1 due to the load of the fan-shaped body 2 can be suppressed.

[0055] The insertion length L5 of the engaging pin 32 into the insertion hole 33 is preferably 50% or more of the length L2 of the engaging pin 32. According to the relevant structure, the fixing force of the engaging pin 32 with respect to the insertion hole 33 can be increased, and the situation where the engaging pin 32 tilts within the insertion hole 33 can be suppressed. Thereby, breakage of the bolt B1 due to the load of the fan-shaped body 2 can be suppressed. The insertion length L5 of the engaging pin 32 is more preferably 60% or more of the length L2 of the engaging pin 32.

[0056] The insertion length of the engaging pin 32 (the depth Dp of the insertion hole 33) is preferably 20% or more, and more preferably 30% or more, of the thickness T1 in the direction of the central axis CL2 of the container ring 3. [1] As described above, the tire vulcanizing apparatus 100 according to the present embodiment includes: a sector body 2 that holds a sector piece 11a for forming a tread surface; and a container ring 3 that is provided on the outer side in the tire radial direction D2 of the sector body 2. A groove 23 extending in the vertical direction is provided on the outer side in the tire radial direction D2 of the sector body 2. The container ring 3 includes: an engaging pin 32 that engages with the groove 23 during mold opening; and an insertion hole 33 into which the engaging pin 32 is inserted. The engaging pin 32 is fixed to the insertion hole 33 by a bolt B1. On at least the lower part of the outer peripheral surface of the engaging pin 32, a pin-side step 321 that expands in diameter at a position away from the outer side end 32a in the tire radial direction D2 of the engaging pin 32 toward the axis (central axis CL1) of the engaging pin 32 is provided. A hole-side step 331 corresponding to the pin-side step 321 is provided in the insertion hole 33.

[0058] According to the related structure, when the upper part of the engaging pin 32 engages with the groove 23 and a load of the sector body 2 including the sector piece 11a is applied in the downward direction, the pin-side step 321 provided at the lower part of the engaging pin 32 contacts the hole-side step 331 provided in the insertion hole 33, and the situation where the engaging pin 32 tilts in the insertion hole 33 can be suppressed. Thereby, stress concentration on a part of the bolt B1 fixing the engaging pin 32 can be suppressed, and breakage of the bolt B1 can be suppressed. [2] In the tire vulcanizing apparatus 100 according to the above-described embodiment [1], a preferred structure is that the pin-side step 321 is provided on the entire circumference of the engaging pin 32.

[0060] According to the related structure, the contact amount between the pin-side step 321 and the hole-side step 331 increases, and the situation where the engaging pin 32 tilts in the insertion hole 33 due to the load of the sector body 2 can be further suppressed. Thereby, stress concentration on a part of the bolt B1 fixing the engaging pin 32 can be suppressed, and breakage of the bolt B1 can be suppressed. [3] In the tire vulcanizing apparatus 100 according to the above-described embodiment [1] or [2], a preferred structure is that the nominal diameter of the bolt B1 is 50% or more of the minimum diameter (Dm1) of the engaging pin 32.

[0062] According to the related structure, the fixing force of the engaging pin 32 with respect to the insertion hole 33 can be increased, and loosening of the bolt B1 can be suppressed. Thereby, stress concentration on a part of the bolt B1 can be suppressed, and breakage of the bolt B1 due to the load of the sector body 2 can be suppressed. [4] In the tire vulcanizing apparatus 100 according to any one of the above-described embodiments [1] to [3], a preferable structure is that a conical surface 31 inclined outward in the tire radial direction D2 is provided on the sector body 2 side of the container ring 3 and faces downward, and the engaging pin 32 has an internal thread 324 that engages with the bolt B1, and the protruding amount Ap of the internal thread 324 from the conical surface 31 toward the sector body 2 side is 1 mm or less.

[0064] According to the relevant structure, it is possible to suppress a decrease in the strength of the engaging pin 32 caused by the provision of the internal thread 324, and it is possible to suppress deformation and breakage of the engaging pin 32 when engaging with the groove 23. [5] In the tire vulcanizing apparatus 100 according to any one of the above-described embodiments [1] to [4], a preferable structure is that the insertion length L5 of the engaging pin 32 into the insertion hole 33 is 50% or more of the length L2 of the engaging pin 32.

[0066] According to the relevant structure, it is possible to improve the fixing force of the engaging pin 32 with respect to the insertion hole 33, and it is possible to further suppress the inclination of the engaging pin 32 within the insertion hole 33. Thereby, it is possible to suppress stress concentration on a part of the bolt B1 that fixes the engaging pin 32, and it is possible to suppress breakage of the bolt B1.

[0067] It should be noted that the tire vulcanizing apparatus 100 is not limited to the structure of the above-described embodiment and is not limited to the above-described effects. In addition, the tire vulcanizing apparatus 100 can of course be variously modified without departing from the gist of the present invention. For example, of course, it is also possible to arbitrarily select one or more structures, methods, etc. according to the following various modification examples and use them for the structures, methods, etc. according to the above-described embodiment.

[0068] (A) In the present embodiment, the structure is such that the pin-side step 321 is provided on the entire circumference of the engaging pin 32, but it is not limited thereto. For example, as Figure 6 shown, it is also possible to have a structure in which the pin-side step 321 is provided only at the lower part of the engaging pin 32. The same applies to the hole-side step 331 as to the pin-side step 321.

[0069] (B) In the present embodiment, the structure is such that one pin-side step 321 is provided on the outer circumference of the engaging pin 32, but it is not limited thereto. For example, as Figure 7 shown, it is also possible to have a structure in which a plurality of pin-side steps 321 are provided on the outer circumference of the engaging pin 32. In the relevant structure, the plurality of pin-side steps 321 are formed in a stepped shape. The same applies to the hole-side step 331 as to the pin-side step 321.

[0070] (C) In this embodiment, the groove 23 is provided in the sliding member 22, but it is not limited thereto. For example, the groove 23 may be provided in the conical surface 21 of the sector body. In the related structure, the sliding member 22 may also be provided on the conical surface 31.

[0071] Reference Signs 100... Tire vulcanizing apparatus, 1... Tire vulcanizing mold, 11... Tread mold, 11a... Sector member, 12... Upper side wall mold, 13... Lower side wall mold, 14... Bead, 15... Bead, 16... Tire forming surface, 2... Sector body, 21... Sector body conical surface, 22... Sliding member, 23... Groove, 3... Container ring, 31... Container ring conical surface, 32... Engagement pin, 32a... Outer end, 32b... Diameter-expanding surface, 32c... Inner end, 321... First pin side step, 322... Engagement portion, 323... Second pin side step, 324... Internal thread, 33... Insertion hole, 33a... Bottom surface, 331... Hole side step, 4... Lower platen, 5... Tire vulcanizing airbag, 6... Central mechanism, 61... Upper clamping member, 62... Lower clamping member, 63... Central column, B1... Bolt, CL1, CL2... Central axis, Hs... Heat source, T... Pneumatic tire.

Claims

1. A tire vulcanizing device, comprising: A sector body that holds a sector member for forming a tread surface; and A container ring provided on the radially outer side of the sector body in the tire radial direction, A groove extending in the vertical direction is provided on the radially outer side of the sector body in the tire radial direction, The container ring includes: a locking pin that engages with the groove during mold opening; and an insertion hole for inserting the locking pin, The locking pin is fixed to the insertion hole by a bolt, At least the lower part of the outer peripheral surface of the locking pin is provided with a first pin-side step that expands in diameter at a position away from the radially outer end of the locking pin in the axial direction of the locking pin, A hole-side step corresponding to the first pin-side step is provided in the insertion hole.

2. The tire vulcanizing device according to claim 1, wherein The locking pin is formed in a substantially cylindrical shape.

3. The tire vulcanizing device according to claim 1, wherein The first pin-side step is provided on the entire circumference of the locking pin.

4. The tire vulcanizing device according to claim 1, wherein The length from the radially outer end of the locking pin to the first pin-side step is 50% or less of the length of the locking pin.

5. The tire vulcanizing device according to claim 1, wherein The radial width of the locking pin in the first pin-side step is 1 mm or more.

6. The tire vulcanizing device according to claim 1, wherein A second pin-side step that contracts in diameter is provided on the entire circumference of the outer peripheral surface of the locking pin between the first pin-side step and the radially inner end of the locking pin in the tire radial direction.

7. The tire vulcanizing device according to claim 6, wherein A tapered surface that faces downward and is inclined outward in the tire radial direction is provided on the sector body side of the container ring, The second pin-side step is substantially coplanar with the tapered surface.

8. The tire vulcanizing device according to claim 1, wherein The nominal diameter of the bolt is 50% or more of the minimum diameter of the locking pin.

9. The tire vulcanizing device according to claim 1, wherein A tapered surface that faces downward and is inclined outward in the tire radial direction is provided on the sector body side of the container ring, The locking pin has an internal thread that engages with the bolt, The protruding amount of the internal thread from the tapered surface to the sector body side is 1 mm or less.

10. The tire vulcanizing device according to any one of claims 1 to 9, wherein The insertion length of the locking pin into the insertion hole is 50% or more of the length of the locking pin.

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