JP4448230B2 - Belt forming device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt forming apparatus that can increase the number of divisions of a belt segment and can form a raw belt of a tire with higher accuracy.
[0002]
[Prior art]
When manufacturing the radial tire, as schematically shown in FIG. 5, a belt forming apparatus A is used which holds a plurality of belt segments a ... divided in the circumferential direction so as to be movable in the radial direction by expansion / contraction means. A green belt b as a tire forming member is formed into a cylindrical shape.
[0003]
And the thing of the structure as shown in FIG. 6 is widely employ | adopted as the conventional expansion-contraction means A1 of such a belt shaping | molding apparatus A. As shown in FIG. That is, a plurality of slide fittings c for attaching each belt segment a on the outer surface in the radial direction, a side plate e for guiding one end of each slide fitting c inward and outward in the radial direction via the linear guide d, and each slide fitting The expansion / contraction means includes a plurality of wedge-shaped actuating fittings g that engage with a radial inner edge of c through a linear guide d and advance and retreat the slide fitting c in the radial direction by moving forward and backward in the rotational axis direction. A1 is configured. In addition, the said operation metal fitting g ... is integrally attached to the sliding cylinder i extrapolated by the said rotating shaft h.
[0004]
Since this uses linear guides d and d, the movement of the slide fitting c is smooth and highly accurate, and the outer peripheral surface s of the belt segment a does not shift even when rotating at high speed. It has the excellent advantage that it can be maintained in the shape.
[0005]
On the other hand, in recent years, from the viewpoint of further improving tire uniformity, it is desired to increase the total number (divided number) of the belt segments a and to make the outer peripheral surface s during diameter expansion closer to a perfect circle. .
[0006]
[Problems to be solved by the invention]
However, in the linear guide d, in order to ensure the required strength, as shown in FIG. 5, the rail part d1 and the bearing part d2 that receives the rail part d1 need to have a certain width. In order to avoid a collision between the parts d2 and d2, the number of the linear guides d ... arranged in the circumferential direction is greatly restricted. As a result, it is difficult for the expansion / contraction means A1 to increase the total number of belt segments a to about 24 or more, and the above-mentioned demand cannot be satisfied sufficiently.
[0007]
Therefore, the present invention can increase the total number of belt segments to 24 or more, for example, about 36 while securing the advantages of the conventional expansion / contraction means, and the outer peripheral surface (when expanded) has a perfect circle. An object of the present invention is to provide a belt molding apparatus that can improve the tire uniformity and improve the tire uniformity.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 of the present application is that the outer circumferential surface is expanded and contracted by being divided in the circumferential direction and moved in the radial direction by the expansion and contraction means, and the raw belt of the tire is expanded by the expansion. A belt forming apparatus having a number of 2N long belt segments from which the raw belt can be removed by reducing the diameter,
The expansion / contraction means includes
A rotation axis;
Each of the N first and second slide fittings, wherein the belt segments are attached to the outer surface in the radial direction and are alternately arranged in the circumferential direction, and each of the first and second slide fittings has an inclined portion that is inclined outward from the radial direction inside.
First and second side plates extending radially outward from the rotary shaft at both ends of the belt segment;
The first side plate guides one end of the first slide fitting inward and outward in the radial direction via the first guide means, and the second side plate secondly extends one end of the second slide piece inward and outward in the radial direction. In addition to guiding through the guide means,
The first and second slide fittings are moved forward and backward in the direction of the rotation axis by engaging the inclined portions of the first and second slide fittings via first and second inclination guide means, respectively. The first and second actuating brackets having diagonal portions that advance and retreat in the radial direction,
Moreover, the first and second guide means are operated by shifting the respective inclined portions of the first and second slide fittings and the oblique portions of the first and second operation fittings in the direction of the rotation axis. It is characterized in that the associated collision and the collision associated with the operation of the first and second inclined guide means are prevented.
[0009]
According to a second aspect of the present invention, the first and second actuating brackets are advanced and retracted by the movement of the rod extending in the direction of the rotation axis.
[0010]
The invention according to claim 3 is characterized in that the first and second guide means and the first and second inclined guide means both use linear guides.
[0011]
According to a fourth aspect of the present invention, the inclined portion is inclined at an angle of 25 ° to 45 ° with respect to the rotational axis.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a cross-sectional view including a rotation axis J of the belt forming apparatus of the present invention, and FIG. 2 is a cross-sectional view taken along the line II of FIG.
[0013]
In FIG. 2, the belt forming apparatus 1 includes 2N belt segments 2 divided in the circumferential direction, and expansion / contraction means 3 that expands / contracts the outer peripheral surface S by moving the belt segment 2 in the radial direction. Have. The raw belt B is formed into a cylindrical shape on the outer peripheral surface S in the expanded diameter state, and the raw belt B is removed in the reduced diameter state.
[0014]
Here, in the expanded diameter state, a gap G is generated between the belt segments 2 adjacent to each other in the circumferential direction, and therefore, the contour shape of the outer peripheral surface S is strictly formed in a substantially polygonal shape. When the number 2N of 2 is increased, the gap G decreases and approaches a perfect circle, and the uniformity is improved. Therefore, the number 2N is set to be larger than 24, for example, 36.
[0015]
The belt segment 2 is a long piece extending in the direction of the rotational axis, and the outer surface 2S thereof is linear in a cross section including the rotational axis J. Further, the outer surface 2S is formed in an arc shape having a curvature substantially equal to the radius of the outer peripheral surface S in the expanded diameter state in a cross section perpendicular to the rotation axis J. The “substantially equal” means that the radius of the outer peripheral surface S in the expanded diameter state is adjusted according to the tire size, but this adjustment width is allowed.
[0016]
Next, as shown in FIG. 1, the expansion / contraction means 3 includes a rotation shaft 4 and the belt segments 2 mounted on the outer surface in the radial direction and alternately arranged in the circumferential direction. The first and second slide fittings 5L and 5R extend radially outward from the rotating shaft 4 at both ends of the belt segment 2 and the first and second slide fittings 5L and 5R extend inward and outward in the radial direction. The first and second side plates 7L and 7R guided through the guide means 6L and 6R, and the first and second slide fittings 5L and 5R through the first and second inclined guide means 9L and 9R. The first and second operating metal fittings 10L and 10R are engaged to engage and retract the first and second slide metal fittings 5L and 5R in the radial direction. The first and second actuating brackets 10L and 10R are integrally attached to a sliding cylinder 11 that is externally attached to the rotating shaft 4.
[0017]
In other words, the expansion / contraction means 3 is composed of first and second expansion / contraction means portions 12L and 12R sharing the rotating shaft 4 and the sliding cylinder 11, as shown in FIGS. Each of the expansion / contraction means 12L and 12R supports one segment group 13L and the other segment group 13R that are alternately arranged in the circumferential direction among the 2N belt segments 2. For convenience, the N belt segments constituting one segment group 13L may be referred to as a first belt segment 2L, and the N belt segments constituting the other segment group 13R may be referred to as a second belt segment 2R.
[0018]
The first expansion / contraction means 12L includes the first slide fitting 5L, the first side plate 7L, the first guide means 6L, the first inclined guide means 9L, and the first operating fitting. 10L.
[0019]
The first slide fitting 5L has a plate shape for attaching the first belt segment 2L on the outer surface in the radial direction, and has a pitch angle α of 360 / N degrees (20 degrees in this example) around the rotation axis J. Are arranged radially.
[0020]
The first side plate 7L has a substantially disk shape extending radially outward from the rotary shaft 4 on one end side (the left end side in FIGS. 1 and 3) of the belt segment 2, and can rotate integrally with the rotary shaft 4. Fixed to. Reference numeral 14 denotes a key for preventing rotation, and reference numeral 15 denotes a fixing ring which is secured to the rotating shaft 4 and which fixes the first side plate 7L with bolts. The first side plate 7L guides one end (the left end in FIGS. 1 and 3) of the first slide fitting 5L inward and outward in the radial direction via the first guiding means 6L.
[0021]
In this example, the first guide means 6L is a linear guide, and a rail portion 16 that extends linearly, and a block shape that can move relative to the rail portion 16 by engaging with the rail portion 16. The bearing portion 17 is formed. In this example, the rail portion 16 is disposed at a right angle to the rotation axis J and at the one end of the first slide fitting 5L, and the bearing portion 17 is disposed on the inward surface of the first side plate 7L. The case where it is arranged is illustrated.
[0022]
The first slide fitting 5L has an inclined portion 21 inclined radially inward from the inside in the radial direction, and the sliding tube 11 is provided with the first inclined guide means 9L on the inclined portion 21. 10L of 1st operation metal fittings which have the diagonal part 22 engaged via are fixed integrally. The first operating metal fitting 10L has a triangular blade shape, and is arranged in a straight line with the first slide metal fitting 5L as schematically shown in FIG.
[0023]
Further, the sliding cylinder 11 is supported by the key 14 so as to be able to move forward and backward in the direction of the rotation axis J by being extrapolated to the rotation shaft 4 and to rotate integrally with the rotation shaft 4 by the key 14. In this example, a rod 19A of an advancing / retracting tool 19 such as an air cylinder extending in the direction of the rotation axis J is connected to the other end (the right end in FIGS. 1 and 3) of the sliding cylinder 11, and the rod 19A Thus, the first operating fitting 10L can be moved forward and backward together with the sliding cylinder 11.
[0024]
Here, the first inclined guide means 9L is formed by a linear guide comprising a rail portion 16 and a bearing portion 17 in the same manner as the guide means 6L. In the figure, a case where the bearing portion 17 is arranged on the radially inner edge of the first slide fitting 5L and the rail portion 16 is arranged on the radially outer edge of the first actuation fitting 10L is illustrated. Yes. Therefore, in this example, the inclined portion 21 is formed by the receiving surface 17 </ b> A of the bearing portion 17, and the inclined portion 22 is formed by the rail portion 16.
[0025]
Thus, since the first slide fitting 5L is guided in the radial direction by the first guide means 6L, and the inclined portion 21 and the inclined portion 22 are engaged with each other, the first slide fitting 5L is interposed in a wedge shape. The first slide fitting 5L can be moved back and forth in the radial direction by the forward and backward movement of the one operating fitting 10L in the direction of the rotation axis J. In order to smoothly perform the forward / backward movement in the radial direction, it is preferable that the angle β of the inclined portion 21 with respect to the rotational axis J is set to 25 ° to 45 °. More preferably, it is 35 to 40 degrees.
[0026]
Next, the second expansion / contraction means portion 12R has substantially the same configuration as the first expansion / contraction means portion 12L, and includes a second slide fitting 5R, a second side plate 7R, and a second guide means. 6R, 2nd inclination guide means 9R, and 2nd operation metal fitting 10R are provided.
[0027]
The second slide metal fitting 5R has a plate shape for attaching the second belt segment 2R on the outer surface in the radial direction, has the pitch angle α, and has a substantially half pitch (approximately α / 2) They are arranged radially with a phase shift in the circumferential direction.
[0028]
The second side plate 7R is fixed to the rotary shaft 4 so as to be integrally rotatable on the other end side of the belt segment 2 (right end side in FIGS. 1 and 3). Reference numeral 23 in the figure denotes a fixing ring for fixing the second side plate 7R with a bolt, and the side plate 7R and the fixing ring 23 have holes for inserting the rod 19A.
[0029]
The first side plate 7R guides one end (the right end in FIGS. 1 and 3) of the second slide fitting 5R inward and outward in the radial direction via the second guide means 6R. A similar linear guide is used as the second guide means 6R. The rail portion 16 is provided at the one end of the second slide fitting 5R, and the bearing portion 17 is provided on the inward surface of the second side plate 7R. ing.
[0030]
The second slide fitting 5R has an inclined portion 25 that is inclined radially inward from the inside in the radial direction, and the sliding tube 11 is provided with second inclined guide means 9R on the inclined portion 25. The second operating metal fitting 10R having the oblique portion 26 engaged therewith is fixed integrally. The second operating metal fitting 10R has a triangular blade shape substantially the same as the first operating metal fitting 10L, and is arranged in line with the second slide metal fitting 5R.
[0031]
In addition, a similar linear guide is used as the second inclined guide means 9R. In this example, the bearing portion 17 is at the radially inner edge of the second slide fitting 5R, and the rail portion 16 is the second guide. It is arranged on the radially outer edge of the operating bracket 10R. Therefore, the inclined portion 25 is formed by the receiving surface 17 </ b> A of the bearing portion 17, and the inclined portion 26 is formed by the rail portion 16.
[0032]
The inclined portion 25 and the inclined portion 21 have the same inclination direction and the same inclination angle, and the first and second operation fittings 10L and 10R are moved forward and backward by the sliding cylinder 11 to move the first, The second slide fittings 5L and 5R move forward and backward in the radial direction at the same distance.
[0033]
Moreover, in the expansion / contraction means 3 according to the present invention, as shown in FIG. 1, the inclined portion 21 of the first slide fitting 5L and the inclined portion 25 of the second slide fitting 5R are positioned in the rotational axis J direction. At the same time, the oblique portion 22 of the first operating fitting 10L and the oblique portion 26 of the second operating fitting 10R are displaced in the direction of the rotational axis.
[0034]
Therefore, due to this positional deviation, the collision associated with the operation of the first and second inclined guide means 9L, 9R, for example, the collision between the bearing parts 17, 17 adjacent to each other in the circumferential direction and the rotation axis direction or the bearing part. It is possible to avoid a collision between the sliding member 17 and the slide fittings 5L and 5R.
[0035]
In the expansion / contraction means 3, since the first and second guide means 6L, 6R are separately arranged on one end side and the other end side of the belt segment 2, the first and second guide means 6L, The collision caused by the operation of 6R, for example, the collision between the bearing portions 17 and 17 or the collision between the bearing portion 17 and the slide fittings 5L and 5R can be similarly avoided.
[0036]
As a result, the restriction on the number 2N of the belt segments 2 is relaxed, and can be greatly increased to more than 24, for example, about 36.
[0037]
In this example, in order to reduce the size of the belt forming apparatus 1, the first side plate 7L is formed with a recessed portion 29 for accommodating the first operating metal fitting 10R at the time of diameter expansion in the radially inner portion thereof. is doing.
[0038]
In the first and second guide means 6L, 6R and the first and second inclined guide means, the rail portion 16 and the bearing portion 17 can be attached in reverse. The inclined portions 21 and 25 can be formed by the radially inner end surfaces of the slide fittings 5L and 5R, and the inclined portions 22 and 26 can be formed by the radially outer end surfaces of the operation fittings 10L and 10R themselves. In such a case, a linear guide in which each end surface is a bearing surface is configured.
[0039]
As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.
[0040]
【The invention's effect】
Since the present invention is configured as described above, the movement of the slide fitting is smooth and highly accurate, and the outer peripheral surface is maintained in a perfect circle without the belt segment being displaced even when rotating at high speed. The total number of belt segments can be greatly increased, for example, to about 36, while ensuring the excellent advantage of being able to. Therefore, the roundness of the outer peripheral surface (when the diameter is expanded) can be further improved, and can greatly contribute to the improvement of tire uniformity.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view including a rotation axis of one embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II of FIG.
FIG. 3 is a sectional view showing the expansion / contraction means disassembled into first and second expansion / contraction means portions.
4 is a diagram showing the arrangement of belt segments in FIG. 3; FIG.
FIG. 5 is a cross-sectional view perpendicular to the rotational axis showing a conventional belt forming apparatus;
FIG. 6 is a cross-sectional view including a rotation axis showing a conventional belt forming apparatus,
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Belt forming apparatus 2 Belt segment 3 Expansion / contraction means 4 Rotating shafts 5L, 5R First and second slide fittings 6L, 6R First and second guide means 7L, 7R First and second side plates 9L, 9R 1, 2nd inclination guide means 10L, 10R 1st, 2nd operation metal fitting 19A Rod 21, 25 Inclination part 22, 26 Diagonal part B Raw belt S Outer peripheral surface

Claims (4)

The outer circumferential surface is divided in the circumferential direction and moved in the radial direction by expansion / contraction means, and the outer peripheral surface expands and contracts, and the raw belt of the tire can be formed by the expansion and the raw belt can be removed by the contraction. A belt forming device having a piece of belt segment,
The expansion / contraction means includes
A rotation axis;
Each of the N first and second slide fittings, wherein the belt segments are attached to the outer surface in the radial direction and are alternately arranged in the circumferential direction, and each of the first and second slide fittings has an inclined portion that is inclined outward from the radial direction inside.
First and second side plates extending radially outward from the rotary shaft at both ends of the belt segment;
The first side plate guides one end of the first slide fitting inward and outward in the radial direction via the first guide means, and the second side plate secondly extends one end of the second slide piece inward and outward in the radial direction. In addition to guiding through the guide means,
The first and second slide fittings are moved forward and backward in the direction of the rotation axis by engaging the inclined portions of the first and second slide fittings via first and second inclination guide means, respectively. The first and second actuating brackets having diagonal portions that advance and retreat in the radial direction,
Moreover, the first and second guide means are operated by shifting the respective inclined portions of the first and second slide fittings and the oblique portions of the first and second operation fittings in the direction of the rotation axis. A belt forming apparatus characterized in that the accompanying abutting and the abutting associated with the operation of the first and second inclined guide means are prevented. 2. The belt forming apparatus according to claim 1, wherein the first and second actuating brackets are advanced and retracted by movement of a rod extending in the direction of the rotation axis. The belt forming apparatus according to claim 1 or 2, wherein both the first and second guide means and the first and second inclined guide means use linear guides. The belt forming apparatus according to claim 1, wherein the inclined portion is inclined at an angle of 25 ° to 45 ° with respect to the rotation axis.

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