JP2019077120A - Tire member molding apparatus - Google Patents

Abstract

To provide a tire member molding apparatus which can be miniaturized.SOLUTION: It is an apparatus for molding an annular tire member. A molding drum 2 includes a plurality of segments 5 aligned in a circumferential direction of the drum, and a rotatable center ring 6 in which each of the segments 5 is movably supported in a radial direction of the drum. Drum expanding and contracting means 3 has a tapered cone portion 7 for moving each of the segments 5 in the radial direction of the drum, a center shaft 8 having one end connected to the tapered cone portion 7 and extending over an axial center of the molding drum 2, and axial moving means 9 for moving the center shaft 8 in the axial direction. The center ring 6 is provided on the center shaft 8 and between the tapered cone portion 7 and the axial moving means 9.SELECTED DRAWING: Figure 2

Description

  The present invention relates to, for example, a tire member forming apparatus for winding an unvulcanized rubber member to form an annular tire member.

  For example, Patent Literatures 1 and 2 below describe a belt forming apparatus provided with a drum portion having an expandable diameter belt forming surface for forming a green belt of a tire. Generally, this type of device is placed on the tire manufacturing line and traverses and turns to exchange material with other devices. Therefore, there is a demand for downsizing in order to save space in the tire manufacturing line, and in particular, downsizing of the dimension in the drum axial direction has been required.

JP 2001-315218 A JP 2002-361758 A

  The present invention has been made in view of the above-described actual conditions, and has as its main object to provide a tire member molding apparatus which can be miniaturized.

  The present invention is an apparatus for molding an annular tire member, comprising a molding drum and drum expansion and contraction means, wherein the molding drum constitutes a substantially annular outer peripheral surface for winding a band-shaped rubber member. And a plurality of segments arranged in the circumferential direction of the drum, and a rotatable center ring in which each of the segments is supported movably in the radial direction of the drum, and the drum expansion and contraction means moves in the axial direction of the drum By moving each of the segments in the radial direction of the drum, a center shaft having one end connected to the tapered cone and extending on the axial center of the forming drum, and the other end of the center shaft Pivoting means connected and axially moving the center shaft, the center ring being the center Are provided between the axial driving means shaft on and the tapered cone section.

  In the tire member molding apparatus of the present invention, it is preferable that the tapered cone portion is tapered toward the axial movement means.

  In the tire member molding apparatus of the present invention, it is desirable that the tapered cone portion be disposed in a space surrounded by the segments.

  In the tire member molding apparatus of the present invention, it is preferable that the tapered cone portion and the center shaft are relatively rotatably connected, and the molding drum is rotated independently of the center shaft.

  In the tire member molding apparatus of the present invention, the axial movement means includes a first electric motor, and the center ring is provided with a rotational force transmission element on the side of the first electric motor, and the rotational force transmission element is Preferably, a second motor for rotating the center ring is linked.

  In the tire member molding apparatus of the present invention, it is desirable that the center ring be rotatably supported on the center shaft.

  In the tire member molding apparatus of the present invention, it is desirable that the first electric motor and the second electric motor be arranged vertically.

  In the tire member molding apparatus of the present invention, it is desirable that the first electric motor and the second electric motor be disposed in one gear box.

  In the tire member molding device of the present invention, it is desirable that the rotational force transmission element is disposed outside the space surrounded by the segments.

  In the tire member molding apparatus of the present invention, the axial movement means preferably includes a ball screw mechanism operated by a first electric motor.

  In the tire member molding apparatus according to the present invention, a center ring for rotating the molding drum, a tapered cone for expanding the diameter of the molding drum, and the tapered cone are provided at the linking portion between the molding drum and the drum expansion and contraction means. By arranging in the space between the axial movement means for moving in the axial direction, it is possible to miniaturize the device size, especially in the drum axial direction.

It is a side view of a tire member molding device of one embodiment of the present invention. It is sectional drawing of the tire member shaping | molding apparatus of FIG. It is an expanded sectional view of the forming drum of FIG. It is a side view of a tire member molding device of a comparative example.

Hereinafter, an embodiment of the present invention will be described based on the drawings.
FIG. 1 shows a side view of a tire member molding apparatus (hereinafter sometimes simply referred to as “apparatus”) 1 of the present embodiment. As shown in FIG. 1, the device 1 of the present invention is used to mold an annular tire member. The device 1 of the present embodiment is suitably used, for example, to form a cylindrical tread member. The tread member is formed by, for example, cylindrically winding a sheet-like tread reinforcing member on the outer peripheral surface of the forming drum 2 of the device 1 and spirally winding a band-like rubber strip on the outer surface thereof.

  FIG. 2 is a cross-sectional view showing the inside of the device 1. As shown in FIG. 2, the device 1 comprises a forming drum 2 and drum expansion and contraction means 3.

  The forming drum 2 has an annular outer peripheral surface. The forming drum 2 includes a central shaft 4, a plurality of segments 5 and a center ring 6.

  The central shaft portion 4 extends in the drum axial direction including, for example, the axial center of the forming drum 2. The central shaft portion 4 of the present embodiment is formed, for example, in a hollow shape.

  A plurality of segments 5 are arranged in the circumferential direction of the drum. Thereby, the plurality of segments 5 constitute a substantially annular outer peripheral surface. A band-shaped rubber member is wound around the outer peripheral surface to form a tire member. The “substantially annular outer peripheral surface” includes, for example, an aspect in which a gap is generated between adjacent segments 5 to an extent that the formation of the tire member is not affected.

  The segment 5 of this embodiment preferably includes, for example, an outer portion 11 forming an outer peripheral surface, and a plate-like inner portion 12 extending inward in the drum radial direction from the outer portion 11.

  The center ring 6 is rotatably supported, for example, on the central shaft 4. The center ring 6 movably supports, for example, each of the segments 5 in the radial direction of the drum. The center ring 6 of the present embodiment is connected to, for example, the inner portion 12 of each segment 5.

  The drum expansion and contraction means 3 includes a tapered cone portion 7, a center shaft 8 and an axial movement means 9.

  The tapered cone portion 7 moves each of the segments 5 in the drum radial direction by moving in the drum axial direction.

  The center shaft 8 is connected at one end to the tapered cone portion 7 and extends on the axial center of the forming drum 2. The center shaft 8 and the tapered cone portion 7 of the present embodiment are connected to be relatively rotatable. Thus, the center ring 6 is rotatably supported on the center shaft 8. The center shaft 8 of the present embodiment is, for example, disposed inside the central shaft 4 so as to be movable in the drum axial direction.

  The axial movement means 9 is connected to the other end side of the center shaft 8. The axial movement means 9 of the present embodiment includes, for example, a first electric motor 10 and a ball screw mechanism 14 disposed on the other end side of the center shaft 8. The ball screw mechanism 14 operates by the rotational force of the first electric motor 10 to move the center shaft 8 in the drum axial direction.

  It is desirable that the first electric motor 10 of the present embodiment is housed, for example, in a gearbox 15 connected to the central shaft 4. The ball screw mechanism 14 is preferably disposed, for example, inside the central shaft 4.

  The center ring 6 is provided on the center shaft 8 and between the tapered cone portion 7 and the pivoting means 9. Thus, the device 1 of the present invention is a tapered cone portion for expanding the diameter of the forming drum 2 and the center ring 6 for rotating the forming drum 2 at the linking portion between the forming drum 2 and the drum expanding and contracting means 3. By disposing the space 7 and the axial movement means 9 for moving the tapered cone portion 7 in the axial direction, it is possible to reduce the size of the apparatus, in particular, in the drum axial direction.

  An enlarged cross-sectional view of the forming drum 2 is shown in FIG. As shown in FIG. 3, the center ring 6 of the present embodiment includes, for example, a main body 16, a segment support 17, and a rotational force transmission element 18.

  The main body 16 is, for example, cylindrical and is rotatably supported on the central shaft 4 via a bearing 19.

  The segment support portion 17 has, for example, a disk shape extending outward in the drum radial direction from an end of the central shaft portion 4 on the side of the axial movement means 9. For example, a groove portion in which the inner portion 12 of the segment 5 fits is disposed on the outer surface of the segment support portion 17 on the taper cone portion 7 side. Thus, each of the segments 5 is supported movably in the radial direction of the drum on the outer surface of the segment support portion 17.

  As shown in FIG. 2, the rotational force transfer element 18 is provided, for example, closer to the first electric motor 10 than the main body portion 16. The rotational force transfer element 18 of this embodiment is, for example, disposed outside the space surrounded by the segments 5. The rotational force transfer element 18 is, for example, cylindrical and linked with a second motor 20 for rotating the center ring 6 via a chain 21. The second motor 20 can rotate the center ring 6 and the segment 5 supported by the center ring 6.

  In the present embodiment, the second electric motor 20 for rotating the forming drum 2 can be disposed close to the forming drum 2 by the above-described rotational force transmitting element 18. Thus, the device 1 can be miniaturized.

  In order to further miniaturize the device 1, for example, the second electric motor 20 is desirably disposed side by side with the first electric motor 10. In a more desirable embodiment, the first motor 10 and the second motor 20 are arranged in one gearbox 15.

  As shown in FIG. 3, in order to reduce the device size in the drum axial direction, it is desirable that the rotational force transfer element 18 have, for example, a smaller axial length than the main body portion 16.

  It is desirable that the tapered cone portion 7 be disposed in the space entirely surrounded by the segments 5. As a result, the device 1 can be further miniaturized.

  The tapered cone portion 7 is, for example, tapered toward the axial movement means 9 side. The tapered cone portion 7 of the present embodiment has, for example, a rail portion 22 inclined inward in the radial direction of the drum toward the axial movement means 9 side. The inner portion 12 of the segment 5 is disposed on the rail portion 22. When the tapered cone portion 7 moves toward the axial movement means 9, the inner portion 12 of the segment 5 is pushed by the rail portion 22 and the segment 5 moves outward in the drum radial direction.

  The tapered cone portion 7 includes, for example, a cone base 25 including the above-mentioned rail portion 22 and in contact with each segment 5, a connecting portion 26 connected to the center shaft 8, and a push rod 27 between the cone base 25 and the connecting portion 26. Contains.

  The cone base 25 includes, for example, a support 28 that supports the rail 22. The support portion 28 is movable in the drum axial direction on the main body portion 16 of the center ring 6. Further, the support portion 28 can not move relative to the main body portion 16 in the drum circumferential direction. Thus, the tapered cone portion 7 can rotate around the central shaft portion 4 integrally with the center ring 6.

  The connection portion 26 is, for example, a disk shape, and one end of the center shaft 8 is connected to the central portion thereof. The connecting portion 26 can move integrally with the center shaft 8 in the drum axial direction. The connecting portion 26 is rotatably connected to the center shaft 8 via, for example, a bearing 29.

  The push rod 27 is, for example, a rod-like member extending in the drum axial direction, and a plurality of the push rods 27 are arranged in the drum circumferential direction. The push rod 27 can transmit the axial movement of the connecting portion 26 to the cone base 25. In a desirable embodiment, the push rods 27 can be replaced by ones of different lengths. Thereby, according to the specification of the tire member to shape | mold, the movement amount and movement start position of the taper cone part 7 can be changed.

  The number of push rods 27 is desirably, for example, 2 to 6. Thereby, the push rod 27 absorbs the stress when the center shaft 8 moves, and the excessive stress does not act on the tapered cone portion 7. As a result, even if the device 1 is used for a long period of time, unnecessary deformation of the tapered cone 7 does not occur, and the device 1 can be maintained in a good state only by replacing the push rod 27. Is reduced.

  In order to concentrate damage on the connecting portion 26 and the push rod 27 without causing damage or fatigue due to long-term use of the device 1 on the tapered cone portion 7 and the center ring 6, the push rod 27 It is desirable to be supported by a portion with a small thickness. Thereby, the apparatus 1 can be maintained in a good state only by exchanging the push rod 27 and the connection part 26.

  As mentioned above, although the tire member shaping | molding apparatus of one Embodiment of this invention was demonstrated in detail, this invention can be changed into a various aspect, and can be implemented, without being limited to said specific embodiment.

  As an example, a tire member molding apparatus shown in FIG. 2 was prepared. As a comparative example, the conventional tire member molding apparatus shown in FIG. 4 was prepared. In the device a of FIG. 4, a tapered cone d is disposed between the center ring c and the pivoting means e. Further, in the device a, the axial movement means e is disposed between the motor f for rotating the forming drum b and the forming drum b.

  As a result of measuring the length in the drum axial direction of the device of the example and the device of the comparative example, the length in the drum axial direction of the device of the example is about 80% of the length in the drum axial direction of the device of the comparative example. It can be confirmed that the device of the present invention has achieved miniaturization.

DESCRIPTION OF SYMBOLS 2 forming drum 3 drum expansion-contraction means 5 segments 6 center ring 7 taper cone part 8 center shaft 9 axis moving means

Claims (10)

An apparatus for forming an annular tire member, comprising:
Including forming drum and drum expansion and contraction means,
The forming drum supports a plurality of segments arranged in the circumferential direction of the drum so as to form a substantially annular outer peripheral surface for winding a band-shaped rubber member, and the segments are supported movably in the radial direction of the drum And a rotatable centering ring,
The drum expanding and contracting means includes a tapered cone portion which moves each of the segments in the drum radial direction by moving in the drum axial direction;
A center shaft having one end connected to the tapered cone and extending on the axial center of the forming drum; and axial movement means connected to the other end of the center shaft and moving the center shaft in the axial direction;
The center ring is provided on the center shaft and between the tapered cone portion and the pivoting means.
Tire member forming apparatus.   The tire member molding device according to claim 1, wherein the tapered cone portion is tapered toward the axial movement means.   The tire member molding device according to claim 1, wherein the tapered cone portion is disposed in a space surrounded by the segments. The tapered cone portion and the center shaft are relatively rotatably connected,
The tire member molding apparatus according to any one of claims 1 to 3, wherein the molding drum rotates independently of the center shaft. The axial movement means includes a first motor,
The center ring is provided with a torque transfer element on the side of the first motor,
The tire member molding apparatus according to any one of claims 1 to 4, wherein a second electric motor for rotating the center ring is linked to the rotational force transmission element.   The tire member molding apparatus according to claim 5, wherein the center ring is rotatably supported with respect to the center shaft.   The tire member molding device according to claim 5 or 6, wherein the first electric motor and the second electric motor are arranged side by side vertically.   The tire member molding apparatus according to any one of claims 5 to 7, wherein the first motor and the second motor are disposed in one gearbox.   The tire member molding apparatus according to any one of claims 5 to 8, wherein the rotational force transmission element is disposed outside the space surrounded by the segments.   10. The tire member molding apparatus according to any one of claims 1 to 9, wherein the pivoting means includes a ball screw mechanism operated by a first electric motor.

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