CN112930254A

CN112930254A - Tire vulcanizing device

Info

Publication number: CN112930254A
Application number: CN201980068142.2A
Authority: CN
Inventors: 石原泰之
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 2018-10-16
Filing date: 2019-09-10
Publication date: 2021-06-08
Anticipated expiration: 2039-09-10
Also published as: WO2020079994A1; JP7064423B2; CN112930254B; JP2020062787A

Abstract

Simply reducing the forces acting on the tire when opening the multiple mold halves of the tire curing apparatus. A tire vulcanizing device (1) includes an outer ring (30) that moves a plurality of mold halves (50) in a tire radial direction (R). The mold half (50) has a 1 st contact portion (56) and a 2 nd contact portion (57) that contact the outer ring (30). The outer ring (30) has: a 1 st sliding section (33) which is in slidable contact with the 1 st contact section (56) and moves the mold half (50) to the inside (R1) in the tire radial direction (R) in a 1 st posture (S1) when the tire (10) is molded; and a 2 nd sliding section (34) which is brought into slidable contact with the 2 nd contact section (57) and moves the mold half (50) to the outside (R2) in the tire radial direction (R) in a 2 nd posture inclined with respect to the 1 st posture (S1).

Description

Tire vulcanizing device

Technical Field

The present invention relates to a tire vulcanizing device including a plurality of mold segments and an outer ring.

Background

The plurality of mold segments of the tire vulcanizing device are arranged along the tire circumferential direction and are opened and closed by moving in the tire radial direction. When the tire is vulcanized, the tire vulcanizing device closes the plurality of mold pieces, and the tire is vulcanized inside the plurality of mold pieces. After the tire is vulcanized, the tire vulcanizing device opens the plurality of mold halves to separate each mold half from the tire.

In a conventional tire vulcanizer, when a plurality of mold halves are opened, the entire mold halves are simultaneously separated from the tire toward the outer side in the tire radial direction. Therefore, the force required for the movement of the plurality of mold halves is large, and the force acting on the tire is also large. In contrast, a vulcanization mold in which a plurality of mold halves are obliquely separated from a tire is known (see patent document 1).

However, in the vulcanization mold described in patent document 1, a complicated moving mechanism is required to move the mold half, and the movement operation of the mold half is also complicated. Further, the structure of the vulcanization mold is greatly different from the structure of a general mold. Therefore, when the vulcanization mold is used, the entire tire vulcanizing device must be replaced, and the replacement cost increases.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2014/087089

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the conventional problems, and an object thereof is to easily reduce a force acting on a tire when a plurality of mold halves of a tire vulcanizing device are opened.

Means for solving the problems

The present invention is a tire vulcanizing device including a plurality of mold pieces arranged along a tire circumferential direction and an outer ring for moving the plurality of mold pieces in a tire radial direction. The mold half has a 1 st contact portion that contacts the outer ring when moving inward in the tire radial direction and a 2 nd contact portion that contacts the outer ring when moving outward in the tire radial direction. The outer ring has: a 1 st sliding portion for slidably contacting the 1 st contact portion of the mold half and moving the mold half to the inside in the tire radial direction in a 1 st posture at the time of molding the tire; and a 2 nd sliding portion which slidably contacts the 2 nd contact portion of the mold half and moves the mold half to the outer side in the tire radial direction in a 2 nd posture inclined with respect to the 1 st posture.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to easily reduce the force acting on the tire when the plurality of mold halves of the tire vulcanizing device are opened.

Drawings

Fig. 1 is a sectional view showing a tire vulcanizing device according to embodiment 1.

Fig. 2 is a sectional view showing the tire vulcanizing device according to embodiment 1.

Fig. 3 is a sectional view showing the tire vulcanizing device according to embodiment 1.

Fig. 4 is a sectional view showing an outer ring and a mold half of embodiment 1.

Fig. 5 is a cross-sectional view showing the operation of the mold half of embodiment 1.

Fig. 6 is a cross-sectional view showing the operation of the mold half of embodiment 1.

Fig. 7 is a cross-sectional view showing the operation of the mold half of embodiment 2.

Fig. 8 is a cross-sectional view showing the operation of the mold half of embodiment 2.

Detailed Description

An embodiment of a tire vulcanizing device of the present invention is explained with reference to the drawings.

The tire vulcanizing apparatus of the present embodiment is used for molding and vulcanizing an unvulcanized tire (green tire) to manufacture a vulcanized tire (finished tire). Hereinafter, a plurality of embodiments of the tire vulcanizing device will be described in order.

(embodiment 1)

Fig. 1 to 3 are cross-sectional views showing a tire vulcanizing device 1 according to embodiment 1, and show an opening and closing operation of the tire vulcanizing device 1. Fig. 1 to 3 show a cross-sectional view including the width direction of the tire 10 (tire width direction W) and the radial direction of the tire 10 (tire radial direction R), and show the tire 10 and the tire vulcanizing device 1 located on one side with respect to the axis of the tire 10.

As shown in the figure, the tire vulcanizing device 1 includes a mold 2 arranged along a circumferential direction (tire circumferential direction) of a tire 10, a movable member 20 movable in a tire width direction W, a fixed member 21 fixed in the tire vulcanizing device 1, and an outer ring 30 provided on the movable member 20. The tire vulcanizing apparatus 1 (see fig. 1) shapes an unvulcanized tire 10 by using an annular mold 2, and heats and vulcanizes the tire 10 in the mold 2. The tire 10 is pressurized by a bladder (not shown) disposed in the tire 10 and pressed against the mold 2.

Here, when directions related to the tire vulcanizing device 1 and the mold 2 are indicated, a direction related to the tire 10 formed by the mold 2 is used. The directions of the tire 10 are the tire circumferential direction, the tire radial direction R, and the tire width direction W. The tire vulcanizing apparatus 1 and the model 2 are explained based on each direction of the tire 10. The tire circumferential direction coincides with the circumferential direction of the model 2 (model circumferential direction), and the tire radial direction R coincides with the radial direction of the model 2 (model radial direction). The tire width direction W coincides with the axial direction of the tire 10 and the width direction of the model 2 (model width direction).

The movable member 20 is an upper plate disposed above the mold 2, and the fixed member 21 is a lower plate disposed below the mold 2. The outer ring 30 is fixed to the movable member 20 and moves integrally with the movable member 20. The movable member 20 and the outer ring 30 are moved in the tire width direction W above the fixed member 21 by a moving device (not shown). The mold 2 is disposed between the movable member 20 and the fixed member 21, and is coupled to the movable member 20, the fixed member 21, and the outer ring 30.

The mold 2 is an outer mold for receiving the tire 10 and is used for molding the outer surface of the tire 10. Further, the mold 2 includes a pair of annular side molds 40 and 41 (an upper mold 40 and a lower mold 41) and a plurality of mold pieces 50 movable in the tire radial direction R. The upper mold 40 is attached to the movable member 20 and moves integrally with the movable member 20. The lower mold 41 is attached to the fixing member 21. The

side molds

40 and 41 have forming portions (side forming portions) 42 and 43 formed on the tire 10 side, and the side portion 11 of the tire 10 is formed by the forming

portions

42 and 43.

The plurality of mold pieces 50 are a combined model (divided model) and are divided in the tire circumferential direction. The plurality of mold halves 50 are arranged in a ring shape along the tire circumferential direction for shaping the tire 10. The plurality of mold segments 50 are tread molds for molding the tread portion 12 of the tire 10, and are opened and closed by moving in the tire radial direction R on the outer circumferential side of the tire 10 (see fig. 1 and 2). The end surface of the die 50 on the side of the fixing member 21 is formed as a horizontal plane, and is in contact with the plane of the fixing member 21 on the side of the die 50. The plurality of mold halves 50 move along the fixing member 21 in a state of being in contact with the fixing member 21 when moving in the tire radial direction R.

The mold half 50 has a molding member 51 for molding the tire 10, a holding member 52 for holding the molding member 51, a molding portion 53 located on the inner side R1 (inner circumferential side) in the tire radial direction R, and a back surface portion 54 located on the outer side R2 (outer circumferential side) in the tire radial direction R. The forming member 51 is attached to the inner side R1 of the holding member 52 in the tire radial direction R, and moves integrally with the holding member 52. The molding portion 53 is an inner peripheral portion of the mold half 50 and is formed at a portion inside R1 in the tire radial direction R of the molding member 51. The mold half 50 molds the tread portion 12 of the tire 10 with the molding portion 53 of the molding member 51. The back surface portion 54 is a portion of the outer peripheral portion of the mold half 50 located on the opposite side of the molding portion 53 and formed on the outer side R2 (back surface side) of the holding member 52 in the tire radial direction R. The back surface portion 54 side portion of the mold half 50 is coupled to the outer ring 30. In the mold half 50 and the outer ring 30, the inner side R1 in the tire radial direction R is the tire 10 side, and the outer side R2 in the tire radial direction R is the opposite side of the tire 10.

The outer ring 30 is an outer member (ring-shaped member) formed in a ring shape, is disposed on the outer side R2 in the tire radial direction R of the plurality of mold pieces 50, and surrounds the plurality of mold pieces 50. The plurality of mold segments 50 are disposed inside the outer ring 30 and movably coupled to the outer ring 30. With the movement of the movable member 20, the outer ring 30 moves in the tire width direction W (here, the vertical direction), and applies a force for movement to the plurality of mold segments 50. The plurality of mold halves 50 move in the tire radial direction R along the fixed member 21 by the force received from the outer ring 30. Further, after moving to the outermost side in the tire radial direction R (see fig. 2), the plurality of mold pieces 50 move in the tire width direction W together with the outer ring 30 and are separated from the fixing member 21 (see fig. 3).

When the tire 10 is vulcanized, the movable member 20 is separated from the fixed member 21, and the mold 2 is opened (see fig. 3). Thereby, the upper mold 40, the outer ring 30, and the plurality of mold pieces 50 are separated from the fixing member 21 and the lower mold 41, and the plurality of mold pieces 50 are moved and opened to the outer side R2 in the tire radial direction R. In this state, the unvulcanized tire 10 is placed on the lower mold 41, and the lower mold 41 is brought into contact with the sidewall 11 of the tire 10. Next, the movable member 20 is moved to one side (here, the lower side) in the tire width direction W, and the upper mold 40, the outer ring 30, and the plurality of mold pieces 50 are brought close to the fixed member 21 and the lower mold 41 (see fig. 2). Further, the plurality of mold pieces 50 are pushed toward the inner side R1 in the tire radial direction R by the outer ring 30 moving to one side in the tire width direction W and moved along the fixing member 21 (see fig. 1). Thereby, the plurality of mold halves 50 are moved and closed to the inner side R1 in the tire radial direction R.

The plurality of mold halves 50 are combined in a ring shape, surround the tire 10, and contact the tread portion 12 of the tire 10 at the forming portion 53 of the forming member 51. Further, the upper model 40 is in contact with the sidewall portion 11 of the tire 10. Thereby, the upper mold 40, the lower mold 41, and the plurality of mold halves 50 are combined to close the mold 2. The tire 10 is housed in the model 2. In this state, the tire 10 is heated to the vulcanization temperature by a heating mechanism (not shown) of the tire vulcanizing device 1. The tire 10 is shaped and cured using the

side molds

40, 41 and the plurality of mold halves 50 of the mold 2.

After the tire 10 is vulcanized, the movable member 20 is moved to the other side (here, the upper side) in the tire width direction W (see fig. 2) to separate the upper mold 40 and the outer ring 30 from the fixed member 21 and the lower mold 41. Further, the plurality of mold segments 50 are pulled toward the outer side R2 in the tire radial direction R by the outer ring 30 moving to the other side in the tire width direction W, and moved along the fixing member 21. Thereby, the plurality of mold halves 50 are moved outward R2 in the tire radial direction R and opened. The plurality of mold halves 50 are spaced apart in the tire circumferential direction and arranged at intervals. Next, the outer ring 30 is moved together with the plurality of mold segments 50 toward the other side in the tire width direction W, and the mold 2 is opened (see fig. 3). In this state, the vulcanized tire 10 is taken out from the mold 2.

The plurality of mold segments 50 are movable in the tire radial direction R in conjunction with the movement of the outer ring 30 in the tire width direction W, and are capable of being disposed at a molding position P1 (see fig. 1) at which the tire 10 is molded and a spaced position P2 (see fig. 2) spaced from the tire 10. The forming position P1 is an inner position (position in contact with the tire 10) in the tire radial direction R of the plurality of mold halves 50, and the separating position P2 is an outer position in the tire radial direction R of the plurality of mold halves 50 separated from the forming position P1 to the outer side R2 in the tire radial direction R. The outer ring 30 and the mold halves 50 are provided with a moving mechanism by which the plurality of mold halves 50 are moved in synchronization with each other.

Outer ring 30 moves mold half 50 moving inward R1 in tire radial direction R and mold half 50 moving outward R2 in tire radial direction R in different postures from each other, and moves mold half 50 in each posture. Mold half 50 moves inward in the tire radial direction R1 in the same posture (posture 1S 1) (the posture shown in fig. 1) as the posture when tire 10 is molded, and comes into contact with tire 10 in posture 1S 1. At this time, the die piece 50 is maintained in the 1 st posture S1 by the fixing member 21, and slides along the fixing member 21. Further, the mold half 50 moves outward in the tire radial direction R2 in an inclined posture (2 nd posture) in the tire radial direction R with respect to the 1 st posture S1, and separates from the tire 10 in the 2 nd posture. The movement of the mold half 50 will be described in detail below.

Fig. 4 is a cross-sectional view showing outer ring 30 and mold segments 50 of embodiment 1, showing a part of outer ring 30 in tire circumferential direction C. Further, a of fig. 4 represents outer ring 30 and plurality of mold halves 50 cut at line X1-X1 of fig. 1, and B of fig. 4 represents outer ring 30 and plurality of mold halves 50 separated. In fig. 4 and the figures subsequent to fig. 4, the forming member 51 of the die 50 is omitted and the outer ring 30 is hatched.

As shown in the drawing, the tire vulcanizing device 1 includes a plurality of mold pieces 50 arranged along the tire circumferential direction C and an outer ring 30 that moves the mold pieces 50 in the tire radial direction R.

The mold half 50 has an arcuate back surface portion 54 formed along the tire circumferential direction C and a groove portion 55 formed in a concave shape in the back surface portion 54. Back surface portion 54 is an inclined portion (see fig. 1) inclined with respect to tire width direction W, and is located on outer side R2 of mold half 50 in tire radial direction R. The groove portion 55 extends in a direction inclined with respect to the tire width direction W similarly to the back surface portion 54, and opens to the back surface portion 54 of the mold half 50. One groove portion 55 is formed in the center portion in the tire circumferential direction C of the mold half 50. In a cross section orthogonal to the longitudinal direction of the groove portion 55, the groove portion 55 has a T-shape, and a portion on the bottom side is formed to extend toward both sides in the tire circumferential direction C with respect to a portion on the opening side (back surface portion 54 side). Therefore, the width of the bottom portion of the groove 55 is wider than the width of the opening portion of the groove 55.

Outer ring 30 has an inner peripheral portion 31 positioned on an outer side R2 in the tire radial direction R of back surface portion 54 of mold half 50, and a rail portion 32 projecting from inner peripheral portion 31 toward an inner side R1 in the tire radial direction R. Inner circumferential portion 31 is an inclined portion (see fig. 1) inclined with respect to tire width direction W, similarly to back surface portion 54, and is formed in a conical surface shape. Further, inner peripheral portion 31 is positioned on inner side R1 (mold half 50 side) of outer ring 30 in tire radial direction R, and faces back surface portion 54 of mold half 50. The inner peripheral portion 31 of the outer ring 30 and the back surface portion 54 of the mold half 50 are inclined in the same direction with respect to the tire width direction W and face each other in the tire radial direction R.

The rail portion 32 is a protruding portion provided on the inner peripheral portion 31 of the outer ring 30, and extends in a direction inclined with respect to the tire width direction W, similarly to the groove portion 55 of the mold half 50. The plurality of rail portions 32 are provided at the coupling positions of the inner peripheral portion 31 of the outer ring 30 to the plurality of mold halves 50. In a cross section orthogonal to the longitudinal direction of the rail portion 32, the rail portion 32 has a T-shape, and a portion on the tip end side protrudes toward both sides in the tire circumferential direction C with respect to a portion on the base end side (inner circumferential portion 31 side). Therefore, the width of the portion on the tip end side of the rail portion 32 is wider than the width of the portion on the base end side of the rail portion 32.

The rail portion 32 projects from the inner peripheral portion 31 of the outer ring 30 toward the mold half 50 and is coupled to the inside of the groove portion 55 of the mold half 50. Here, the rail portion 32 is a rail-shaped member provided on the inner peripheral portion 31 of the outer ring 30, is disposed in the groove portion 55 of the die piece 50, and is connected to the groove portion 55. The groove portion 55 of the die piece 50 is slidably coupled to the rail portion 32 of the outer ring 30.

Fig. 5 and 6 are sectional views showing the operation of the mold half 50 according to embodiment 1, and show the outer ring 30 and the mold half 50 cut along line X2-X2 in fig. 4 a. Fig. 5 and 6 correspond to fig. 1 and 2, and show the outer ring 30 and the mold half 50 cut in the tire width direction W, and fig. 5 a, 5B, 6 a, and 6B show the operation when the mold half 50 is moved outward R2 in the tire radial direction R in this order. Fig. 5 a shows mold half 50 disposed at a molding position P1 where tire 10 is molded, and fig. 6B shows mold half 50 disposed at a spaced position P2 away from tire 10.

As shown, the mold half 50 has the 1 st contact portion 56 that contacts the outer ring 30 when moving to the inner side R1 in the tire radial direction R and the 2 nd contact portion 57 that contacts the outer ring 30 when moving to the outer side R2 in the tire radial direction R. The 1 st contact portion 56 is provided on the back surface portion 54 of the mold half 50, and the 2 nd contact portion 57 is provided in the groove portion 55 of the mold half 50 (see a in fig. 5). The 2 nd contact portion 57 is an inner surface portion of the groove portion 55, and is formed to face an inner side R1 in the tire radial direction R in the groove portion 55. The 1 st contact portion 56 and the 2 nd contact portion 57 are provided at mutually different positions of the die 50, and slidably contact the outer ring 30, respectively.

Outer ring 30 has a 1 st sliding portion 33 in which a 1 st contact portion 56 of die piece 50 slidably contacts and a 2 nd sliding portion 34 in which a 2 nd contact portion 57 of die piece 50 slidably contacts. The 1 st sliding portion 33 and the 2 nd sliding portion 34 are provided at different positions from each other in the outer ring 30. The 1 st sliding portion 33 is provided on the inner peripheral portion 31 of the outer ring 30, and faces the 1 st contact portion 56 of the mold half 50 in the tire radial direction R. The 2 nd sliding portion 34 is provided in the track portion 32 of the outer ring 30 and is disposed in the groove portion 55 of the die piece 50. Further, the 2 nd sliding portion 34 is formed to face the 2 nd contact portion 57 of the mold half 50 in the tire radial direction R toward the outer side R2 in the tire radial direction R.

The 1 st sliding portion 33, the 2 nd sliding portion 34, the 1 st contact portion 56, and the 2 nd contact portion 57 are each an inclined portion inclined with respect to the tire width direction W. In a cross section of the outer ring 30 including the tire radial direction R and the tire width direction W, the 1 st sliding portion 33 and the 2 nd sliding portion 34 of the outer ring 30 are formed to be inclined in mutually different directions with respect to the tire width direction W, inclined at mutually different inclination angles M1, M2 with respect to the tire width direction W, and extending in mutually different inclined directions. Further, the 1 st sliding portion 33 and the 2 nd sliding portion 34 linearly extend in a direction inclined with respect to the tire width direction W from one side to the other side in the tire width direction W. The 2 nd sliding portion 34 is inclined more largely with respect to the tire width direction W than the 1 st sliding portion 33.

In a cross section of the mold half 50 including the tire radial direction R and the tire width direction W, the 1 st contact portion 56 and the 2 nd contact portion 57 of the mold half 50 are formed to be inclined in the same direction as each other with respect to the tire width direction W, inclined at the same inclination angles K1, K2 as each other with respect to the tire width direction W, and extending in the same inclination direction as each other. Further, the 1 st contact portion 56 and the 2 nd contact portion 57 extend linearly from one side to the other side in the tire width direction W along a direction inclined with respect to the tire width direction W.

The 1 st sliding portion 33, the 1 st contact portion 56, and the 2 nd contact portion 57 are inclined in the same direction as each other and in a direction different from the 2 nd sliding portion 34 with respect to the tire width direction W. That is, the inclination directions of the 1 st sliding portion 33, the 1 st contact portion 56, and the 2 nd contact portion 57 with respect to the tire width direction W are the same, and the inclination direction of the 2 nd sliding portion 34 with respect to the tire width direction W is different from the inclination directions of the 1 st sliding portion 33, the 1 st contact portion 56, and the 2 nd contact portion 57 with respect to the tire width direction W. Therefore, the posture and inclination of the mold half 50 with respect to the tire width direction W change when the 1 st contact portion 56 contacts the 1 st sliding portion 33 and when the 2 nd contact portion 57 contacts the 2 nd sliding portion 34.

The inclination angle M1 of the 1 st slide portion 33 and the inclination angle M2 of the 2 nd slide portion 34 are angles of the

respective slide portions

33, 34 with respect to the tire width direction W in a cross section of the outer ring 30 including the tire radial direction R and the tire width direction W (see a of fig. 5). The inclination angle K1 of the 1 st contact portion 56 and the inclination angle K2 of the 2 nd contact portion 57 are the angles of the

respective contact portions

56, 57 with respect to the tire width direction W in the cross section of the mold half 50 including the tire radial direction R and the tire width direction W.

When the mold half 50 is in the 1 st posture S1 when the tire 10 is molded, the inclination angle M1 of the 1 st slide portion 33, the inclination angle K1 of the 1 st contact portion 56, and the inclination angle K2 of the 2 nd contact portion 57 are the same angle (M1-K1-K2). The inclination angle M2 of the 2 nd slide part 34 is different from the other inclination angles M1, K1, and K2, and is larger than the other inclination angles M1, K1, and K2 (M2 > M1, K1, and K2). Therefore, a value obtained by subtracting the inclination angle M1 of the 1 st slide part 33 from the inclination angle M2 of the 2 nd slide part 34 is larger than 0 (M2-M1 > 0). The 1 st slide portion 33 and the 2 nd slide portion 34 are formed at mutually different inclination angles M1, M2 with respect to the tire width direction W, and are inclined in mutually different inclination directions.

The 1 st sliding portion 33 of the outer ring 30 and the 1 st contact portion 56 of the die piece 50 are formed to be slidable in a state of surface contact with each other, and the 2 nd sliding portion 34 of the outer ring 30 and the 2 nd contact portion 57 of the die piece 50 are formed to be slidable in a state of surface contact with each other. In the outer ring 30, the plurality of mold pieces 50 are moved to the inner side R1 in the tire radial direction R by the plurality of 1 st sliding portions 33, and the plurality of mold pieces 50 are moved to the outer side R2 in the tire radial direction R by the plurality of 2 nd sliding portions 34.

When attempting to move and close the plurality of mold halves 50 to the inner side R1 in the tire radial direction R, the outer ring 30 is moved to one side (here, the lower side) in the tire width direction W. Accordingly, the 1 st contact portion 56 of the die piece 50 contacts the 1 st sliding portion 33 of the outer ring 30 and slides on the 1 st sliding portion 33 (see a of fig. 5). At this time, the 2 nd contact portion 57 of the mold half 50 and the 2 nd sliding portion 34 of the outer ring 30 are disposed to face each other without contacting each other, and the 2 nd sliding portion 34 is separated from the 2 nd contact portion 57 to the inner side R1 in the tire radial direction R. A gap is formed between the 2 nd sliding portion 34 and the 2 nd contact portion 57.

The outer ring 30 applies a force (force in the closing direction) of the inner side R1 in the tire radial direction R to the 1 st contact part 56 of the mold half 50 sliding on the 1 st sliding part 33, and presses the mold half 50 toward the inner side R1 in the tire radial direction R by the 1 st sliding part 33. Thereby, the plurality of mold halves 50 are moved and closed to the inner side R1 in the tire radial direction R. At this time, the 1 st slide portion 33 of the outer ring 30 moves the mold half 50 to the inner side R1 in the tire radial direction R in the 1 st posture S1 (molding posture) when the tire 10 is molded, and the mold half 50 is disposed at the molding position P1. The 1 st posture S1 of the mold half 50 is a state of standing upright (standing posture) in the tire width direction W, and the mold half 50 is arranged along the tire width direction W.

When the plurality of mold halves 50 are opened by moving outward R2 in the tire radial direction R, outer ring 30 is moved to the other side (here, the upper side) in the tire width direction W. Accordingly, the 2 nd contact portion 57 of the die piece 50 contacts the 2 nd sliding portion 34 of the outer ring 30 and slides on the 2 nd sliding portion 34 (see fig. 5B, 6 a, and 6B). At this time, the 1 st contact portion 56 of the mold half 50 and the 1 st sliding portion 33 of the outer ring 30 are disposed to face each other without contacting each other, and the 1 st sliding portion 33 is separated from the 1 st contact portion 56 to the outer side R2 in the tire radial direction R. A gap is formed between the 1 st sliding portion 33 and the 1 st contact portion 56.

The outer ring 30 applies a force (opening force) of the outer side R2 in the tire radial direction R to the 2 nd contact portion 57 of the mold half 50 sliding on the 2 nd slide portion 34, and pulls the mold half 50 toward the outer side R2 in the tire radial direction R by the 2 nd slide portion 34. Thereby, the plurality of mold halves 50 are moved and opened to the outer side R2 in the tire radial direction R. At this time, mold half 50 starts to move from a state of being in close contact with tire 10 to outer side R2 in tire radial direction R. Therefore, the mold half 50 receives a force of the inner side R1 in the tire radial direction R from the tire 10, is pulled toward the outer side R2 in the tire radial direction R, and is gradually separated from the tire 10.

The 2 nd slide portion 34 of the outer ring 30 moves the mold half 50 to the outer side R2 in the tire radial direction R in the 2 nd posture S2 (inclined posture) inclined with respect to the 1 st posture S1, and disposes the mold half 50 at the spaced position P2 (see B of fig. 6). The 2 nd posture S2 of the mold half 50 is a state (inclined posture) inclined from the 1 st posture S1 toward the tire radial direction R, and the mold half 50 is arranged so as to be inclined with respect to the tire width direction W. Further, the mold half 50 in the 2 nd posture S2 is inclined from the 1 st posture S2 such that an end portion (here, a lower end portion) on one side in the tire width direction W is displaced to the outer side R2 in the tire radial direction R from an end portion (here, an upper end portion) on the other side in the tire width direction W. The 2 nd contact part 57 slides on the 2 nd slide part 34, and the die piece 50 is moved in a state of being inclined in accordance with the difference in the inclination directions of the 1 st slide part 33 and the 2 nd slide part 34 (the difference in the inclination angles M1, M2).

The mold half 50 is separated from the tire 10 to the outer side R2 in the tire radial direction R while changing the posture from the 1 st posture S1 to the 2 nd posture S2. Then, the mold half 50 gradually escapes from the tire 10 from one side toward the other side in the tire width direction W, and air gradually flows between the mold half 50 and the tire 10. At the same time, the portions (undercut portions) of the mold halves 50 formed in the undercut shape are sequentially separated from the tire 10, and rubber at the intersection (crossvent) portions is sequentially cut. Therefore, the force acting from mold half 50 on tire 10 when opening the plurality of mold halves 50 can be simply reduced. Further, the rubber of the tire 10 can be suppressed from being permanently deformed or broken. The force required for movement of the plurality of mold halves 50 can also be reduced.

The mold 50 can be easily moved by the outer ring 30 moving in the tire width direction W, and the situation in which the structure of the tire vulcanizing device 1 becomes complicated can be suppressed. Further, the posture of the mold half 50 can be changed by modifying a part of the existing tire vulcanizing apparatus. Therefore, the cost of the tire vulcanizing device 1 can be reduced. The 1 st contact portion 56, the 2 nd contact portion 57, the 1 st sliding portion 33, and the 2 nd sliding portion 34 are the back surface portion 54 of the mold half 50, the groove portion 55 of the mold half 50, the inner peripheral portion 31 of the outer ring 30, and the track portion 32 of the outer ring 30, respectively. Therefore, the structure of the tire vulcanizing device 1 can be simplified, and the movement and posture change of the mold half 50 can be smoothly performed.

The mold half 50 can be easily and reliably arranged in the 1 st posture S1 and the 2 nd posture S2 by the 1 st slide part 33 and the 2 nd slide part 34 being inclined in different directions from each other with respect to the tire width direction W. Since the 1 st sliding portion 33 and the 2 nd sliding portion 34 extend linearly, the 1 st sliding portion 33 and the 2 nd sliding portion 34 can be easily formed in the outer ring 30. Further, the shapes of the

contact portions

56 and 57 sliding on the sliding

portions

33 and 34 can be simplified, and the

contact portions

56 and 57 can be easily formed in the die piece 50.

(embodiment 2)

Next, the tire vulcanizing device 1 of embodiment 2 will be explained. With respect to the tire vulcanizing device 1 of embodiment 2, the description of the same matters as those of the tire vulcanizing device 1 of embodiment 1 is omitted. In the configuration of embodiment 2, the same names as those of embodiment 1 are used for the configurations corresponding to those of embodiment 1.

Fig. 7 and 8 are cross-sectional views showing the operation of mold half 50 according to embodiment 2, and sequentially show the operation when mold half 50 is moved to outer side R2 in the tire radial direction R, as in fig. 5 and 6.

As shown in the drawing, in the tire vulcanizing device 1 of embodiment 2, the 2 nd sliding portion 34 of the outer ring 30 and the 2 nd contacting portion 57 of the mold half 50 are formed in a curved shape (refer to a of fig. 7). In a cross section of the outer ring 30 including the tire radial direction R and the tire width direction W, the 2 nd sliding portion 34 extends curvedly from one side to the other side in the tire width direction W in a direction inclined with respect to the tire width direction W, and extends curvedly in an inclined direction different from the 1 st sliding portion 33. The 1 st sliding portion 33 extends linearly in a direction inclined with respect to the tire width direction W from one side to the other side of the tire width direction W, and extends linearly in an inclined direction different from the 2 nd sliding portion 34.

In a cross section of the mold half 50 including the tire radial direction R and the tire width direction W, the 2 nd contact portion 57 extends curvedly from one side to the other side in the tire width direction W in a direction inclined with respect to the tire width direction W in accordance with the shape of the 2 nd slide portion 34, and extends curvedly in an inclined direction different from the 1 st contact portion 56. The 1 st contact portion 56 linearly extends in a direction inclined with respect to the tire width direction W from one side to the other side of the tire width direction W in accordance with the shape of the 1 st sliding portion 33, and linearly extends in an inclined direction different from the 2 nd contact portion 57.

The 2 nd sliding portion 34 and the 2 nd contact portion 57 are formed in circular arc shapes having the same curvature as each other. The 2 nd sliding portion 34 is formed in a concave shape recessed toward the inner side R1 in the tire radial direction R, and the 2 nd contact portion 57 is formed in a convex shape protruding toward the inner side R1 in the tire radial direction R. When the mold half 50 is moved to the outer side R2 in the tire radial direction R, the inclination of the mold half 50 from the 1 st posture S1 gradually increases as the 2 nd contact part 57 slides on the curved 2 nd slide part 34. Therefore, the mold half 50 can be smoothly separated from the tire 10. Further, the inclination of the mold half 50 in the 2 nd posture S2 can be increased.

In addition, the outer ring 30 has a plurality of 2 nd sliding portions 34 corresponding to the plurality of mold halves 50. The plurality of mold halves 50 may be moved outward R2 in the tire radial direction R at the same timing and in the same posture (the same 2 nd posture S2) of the mold halves 50 by the plurality of 2 nd slide portions 34.

On the other hand, the plurality of mold halves 50 may be moved outward R2 in the tire radial direction R at different timings (at least two timings) or in different postures of the mold halves 50 (at least two postures S2) by the plurality of second sliding portions 34. In this case, when the plurality of mold halves 50 are moved to the outer side R2 in the tire radial direction R, the 2 nd contacting portions 57 of the plurality of mold halves 50 slidably contact the plurality of 2 nd sliding portions 34 of the outer ring 30 at different timings or in different postures of the mold halves 50. For example, the timing of the contact between the 2 nd contact portion 57 and the 2 nd contact portion 34 or the posture of the mold half 50 is changed by changing the gap between the 2 nd contact portion 34 and the 2 nd contact portion 57, the inclination direction of the 2 nd slide portion 34, the inclination angle of the 2 nd slide portion 34, and the curvature of the 2 nd slide portion 34 (2 nd posture S2).

By doing so, the plurality of mold halves 50 can be separated from the tire 10 at various timings or in various postures according to the shapes of the respective shaping portions 53. Therefore, even when the shape of the tread portion 12 of the tire 10 is complicated, the plurality of mold halves 50 can be smoothly separated from the tire 10. It is also possible to preferentially apply force to mold halves 50 intended to be preferentially released from tire 10. The preferential mold half 50 is, for example, a mold half 50 having more undercuts than other mold halves 50 or a mold half 50 of a complex shape.

Description of the reference numerals

1. A tire vulcanizing device; 2. a model; 10. a tire; 11. a sidewall portion; 12. a tread portion; 20. a movable member; 21. a fixing member; 30. an outer ring; 31. an inner peripheral portion; 32. a rail portion; 33. the 1 st sliding part; 34. a 2 nd sliding part; 40. an upper side model; 41. a lower side model; 42. a forming section; 43. a forming section; 50. a mold half; 51. a forming member; 52. a holding member; 53. a forming section; 54. a back portion; 55. a groove part; 56. the 1 st contact part; 57. the 2 nd contact part; C. a tire circumferential direction; r, the radial direction of the tire; w, the tire width direction.

Claims

1. A tire vulcanizing device including a plurality of mold pieces arranged along a tire circumferential direction and an outer ring for moving the plurality of mold pieces in a tire radial direction, wherein,

the mold half has a 1 st contact portion which comes into contact with the outer ring when moving to the inner side in the tire radial direction and a 2 nd contact portion which comes into contact with the outer ring when moving to the outer side in the tire radial direction,

the outer ring has:

a 1 st sliding portion for slidably contacting the 1 st contact portion of the mold half and moving the mold half to the inside in the tire radial direction in a 1 st posture at the time of molding the tire; and

and a 2 nd sliding portion which slidably contacts the 2 nd contact portion of the mold half and moves the mold half to the outer side in the tire radial direction in a 2 nd posture inclined with respect to the 1 st posture.

2. The tire vulcanizing device according to claim 1,

the 1 st contact part of the mold half is provided on the back surface part located on the outer side of the mold half in the tire radial direction,

the 2 nd contact portion of the mold half is provided in a groove portion opened to the back surface portion of the mold half,

the 1 st sliding part of the outer ring is arranged on the inner circumferential part which is positioned on the inner side of the outer ring in the tire radius direction and is opposite to the back surface part of the mould section,

the 2 nd sliding portion of the outer ring is provided at a rail portion projecting from an inner peripheral portion of the outer ring toward the die piece and coupled to the inside of the groove portion of the die piece.

3. The tire vulcanizing device according to claim 1 or 2, wherein,

the 1 st sliding portion and the 2 nd sliding portion of the outer ring are inclined in mutually different directions with respect to the tire width direction.

4. The tire vulcanizing device according to claim 3,

the 1 st and 2 nd sliding portions of the outer ring extend linearly from one side to the other side in the tire width direction along a direction inclined with respect to the tire width direction.

5. The tire vulcanizing device according to claim 3,

the 1 st sliding portion of the outer ring extends linearly from one side to the other side in a direction inclined with respect to the tire width direction,

the 2 nd sliding portion of the outer ring extends curvedly from one side to the other side in the tire width direction in a direction inclined with respect to the tire width direction.

6. The tire vulcanizing device according to any one of claims 1 to 5, wherein,

the outer ring has a plurality of 2 nd sliding portions, and when the plurality of mold segments are moved outward in the tire radial direction, the 2 nd contact portions of the plurality of mold segments slidably contact the plurality of 2 nd sliding portions at different timings or in different postures of the mold segments.