JP4897853B2 - Tire molding drum - Google Patents

Description

  The present invention relates to a tire molding drum that forms a tire constituent member by winding a sheet-like body for forming a tire on an outer surface.

  In the raw tire manufacturing process, for example, when forming a tire constituent member such as an inner liner rubber or a carcass ply, the tire constituent member forming sheet is wound in the circumferential direction on the outer surface of the tire forming drum. Forming in a cylindrical shape is performed.

  In this tire molding drum, it is necessary to reduce the diameter in order to remove the wound cylindrical tire constituent member, and conventionally, as shown in FIG. A plurality of segments b divided in the circumferential direction are configured, and each segment b is configured to be movable inward and outward in the radial direction by expansion / contraction means (see, for example, Patent Document 1).

  This segment b is composed of two types of first and second segments b1 and b2 that are alternately arranged in the circumferential direction. The first segment has a large circumferential width and radii at both ends in the circumferential direction. An inwardly inclined end face e1 is provided which inclines in the direction in which the circumferential width is reduced inwardly. The second segment has an end face e2 having an outward slope that has a small circumferential width and is inclined in the direction of increasing the circumferential width inward in the radial direction at both ends in the circumferential direction.

  In the reduced diameter state Yr, the second segment b2 can be reduced in diameter by moving backward inward in the radial direction of the first segment b1. Further, in the diameter-expanded state Ye, the first and second segments b1, b2 are arranged side by side in the circumferential direction, and both end faces e1, e2 in the circumferential direction are in contact with each other, so that the first and second segments b1, b2 Each outer surface forms a substantially continuous cylindrical surface s. Thereby, a sheet-like body can be wound in a cylindrical shape with high accuracy on the outer surface.

  In the expansion / contraction means f, as shown in FIG. 8, the drum support shaft g is provided with a slide cylinder h movable in the axial direction, and the slide cylinder h and the first and second segments b1 and b2 are connected to each other. The first and second link bodies i1 and i2 having different lengths are connected to each other.

JP 2000-296563 A

  However, in this structure, since the first and second segments b1 and b2 move simultaneously, the side end faces e1 and e2 of the first and second segments b1 and b2 rub against each other and wear occurs. As a result, there is a problem that the roundness of the drum is lowered, for example, the circumferential width of the first segment b1 is reduced, and the quality of the formed tire is impaired.

  Further, since the first and second segments b1 and b2 move simultaneously, it is necessary to form a notch j having a complicated shape at the circumferential side edge so that the segments b1 and b2 do not interfere with each other. The formation (processing) requires labor and labor, leading to a decrease in drum formation efficiency. In addition, since the notch j inevitably reduces the thickness of the circumferential side edge of the first segment b1 and the width of the side end surface e1, the result is that the wear at the side edge is further accelerated. Invite.

  Therefore, the present invention can suppress wear between the side end surfaces of the first and second segments, can suppress a decrease in drum roundness, and hence a deterioration in the quality of the formed tire, and can be applied to the circumferential side edge of the segment. An object of the present invention is to provide a tire molding drum that can reliably prevent interference between segments without forming a complicated notch and can improve the efficiency of drum formation.

In order to solve the above problems, the invention of claim 1 of the present application is a reduced diameter state in which the outer surface is reduced in diameter by being divided in the circumferential direction and moved inward and outward in the radial direction by the expanding and reducing means, and the outer surface is expanded in diameter. A group of segments composed of a plurality of segments that can move between the expanded diameter state, and one or more sheet-like bodies for forming a tire are wound in the circumferential direction on the outer surface in the expanded diameter state. A tire forming drum capable of forming a tire constituent member and capable of removing the tire constituent member in the reduced diameter state,
The segment group is
A first segment having a large circumferential width having a receiving surface inclined in a direction to reduce the circumferential width inward in the radial direction at both circumferential ends;
The first segments are alternately arranged in the circumferential direction, and are located radially inward of the first segment in the reduced diameter state, and are circumferentially directed radially inward at both circumferential ends. A second segment having a small circumferential width having an abutting surface in contact with the receiving surface in the diameter-enlarged state and inclined in the direction of increasing the direction width;
Moreover, the expansion / contraction means is
A drum support shaft member having a guide portion extending radially inward and outward;
A cone-shaped slide body which is guided by the drum support shaft member so as to be movable inward and outward in the axial direction and has a guide surface portion which is inclined radially outwardly toward the axially outward direction at an axially inner end portion; ,
By having an engaging portion that is movably guided inward and outward in the radial direction by the guide portion and that engages with the guide surface portion at the radially inner end portion, the slide body moves inward in the axial direction in the axial direction. A plurality of radially moving pieces that can move to
The radial moving piece includes a first moving piece having the first segment attached to a radially outer end portion and a second moving piece having the second segment attached thereto.
The guide surface portion includes a first inclined surface portion that can be engaged with an engaging portion of the first moving piece, an inclination portion different from the first inclined surface portion, and an engaging portion of the second moving piece. Ri Do and a second inclined surface portion capable of being engaged,
The second inclined surface portion is formed of a single inclined surface having a constant gradient that is gently inclined at an angle of θ1 with respect to the axial direction from the inner end in the axial direction of the guide surface portion.
The first inclined surface portion includes a steeply inclined surface portion on the inner side in the axial direction that is steeply inclined at an angle θ2 larger than the angle θ1 with respect to the axial direction from the inner end in the axial direction of the guide surface portion, and the axial direction And a flat surface portion on the outer side in the axial direction in which the angle with respect to 0 is 0 °,
At the time of diameter expansion, the first segment arrives at the diameter expansion position before the second segment, and in this diameter expansion position, the first moving piece engages with the flat surface portion, and The second moving piece engages with the single slope,
When the diameter is reduced, the first segment is started to move inward in the radial direction from the enlarged diameter position later than the second segment.

  The diameter expansion position means a radial position in the diameter expansion state.

  As described above, the present invention includes a cone-shaped slide body having a guide surface portion that is inclined radially outward toward the axial direction outward as an expansion / contraction means, and an engagement portion that engages with the guide surface portion. Thus, the expansion / contraction means is configured using a plurality of radially moving pieces that can move outward in the radial direction by the inward movement of the slide body in the axial direction. The radial moving piece includes a first moving piece that supports the first segment and a second moving piece that supports the second segment, and the guide surface portion is used as the first moving piece. The first inclined surface portion that can be engaged and the first inclined surface portion are configured by a second inclined surface portion that is different in inclination and can be engaged with the second moving piece.

  Thus, the first and second segments can be moved in the radial direction at different timings and speeds by one radial movement of the slide body. When the diameter of the first segment is reduced, the first segment is moved from the enlarged position to the inside in the radial direction later than the second segment. Yes.

  Therefore, rubbing between the side end surfaces of the first and second segments is eliminated, and generation of wear can be suppressed. As a result, it is possible to suppress a decrease in drum roundness and prevent a deterioration in the quality of the formed tire. Further, since the first and second segments can be moved while being separated in the radial direction, there is no interference between the segments. Therefore, a complicated cut is not required and the shape of the side end can be simplified, so that the drum formation efficiency and the design efficiency can be improved.

It is sectional drawing of the axial direction which shows one Example of the tire shaping | molding drum of this invention. It is sectional drawing at right angles to the axial direction which shows the segment group. It is sectional drawing orthogonal to the axial direction which shows the expansion-contraction means enlarged. It is the schematic side view which looked at the slide body from the axial direction inner side. It is the schematic explaining the effect | action of this application. It is sectional drawing of the axial direction which shows the other comparative example of a guide surface part. It is sectional drawing of the tire forming drum explaining a prior art. It is sectional drawing explaining the expansion / contraction means.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a cross-sectional view in the axial direction showing the main part of the tire molding drum of the present invention. For the sake of convenience, in FIG. 1, the tire forming drum 1 in the enlarged diameter state Ye is shown above the axis i of the drum support shaft 9, and the tire forming drum 1 in the reduced diameter state Yr is shown below. ing.

  As shown in FIGS. 1 and 2, the tire molding drum 1 of the present embodiment includes a segment group 2G composed of a plurality of segments 2 divided in the circumferential direction, and expansion / contraction means 3 that moves each segment 2 inward and outward in the radial direction. The segment 2 is moved by the expanding / contracting means 3 between a reduced diameter state Yr where the outer surface S is reduced in diameter and an enlarged diameter state Ye where the outer surface S is expanded. And in the said diameter-expanded state Ye, the tire structural member can be formed in a cylindrical shape by winding 1 or more sheet-like bodies (not shown) for tire formation on the said outer surface S in the circumferential direction, and the said shrinkage | contraction In the radial state Yr, the formed tire constituent member can be detached from the tire molding drum 1.

  Next, the segment group 2G is composed of first and second segments 2A and 2B which are alternately arranged in the circumferential direction as shown in FIG. The first segment 2A is inwardly inclined such that the circumferential width thereof is larger than that of the second segment 2B, and the circumferential width is decreased toward the radially inward at both circumferential ends. An inclined receiving surface 5 is provided. Further, the second segment 2B is smaller in the circumferential width than the first segment 2A, and has an outward inclination that is inclined in the direction of increasing the circumferential width radially inward at both circumferential ends. The contact surface 6 is provided.

  In the tire forming drum 1, the first and second segments 2 </ b> A and 2 </ b> B are arranged side by side in the circumferential direction in the diameter-enlarged state Ye, and the receiving surface 5 and the contact surface 6 that are both end surfaces in the circumferential direction are mutually connected. While abutting, the outer surfaces S of the first and second segments 2A, 2B cooperate to form a substantially continuous cylindrical surface S0. In the reduced diameter state Yr, the second segment 2B moves backward inward in the radial direction with respect to the first segment 2A, whereby the tire molding drum 1 can be reduced in diameter.

  Next, the expansion / contraction means 3 includes a drum support shaft member 11 having a guide portion 10 extending inward and outward in the radial direction, a slide body 12 guided by the drum support shaft member 11 so as to be movable inward and outward in the axial direction, A plurality of radially moving pieces 15 that are guided by the guide portion 10 so as to be movable inward and outward in the radial direction and have engaging portions 14 that engage with the guide surface portion 13 portion of the slide body 12 are provided.

  In this example, as shown in FIGS. 1 and 3, the drum support shaft member 11 includes a cylindrical sleeve main body portion 11a that is concentrically inserted around the drum support shaft 9, and an inner axis direction of the sleeve main body portion 11a. And a substantially disk-shaped side plate 11b rising radially outward from the end. In this example, the sleeve main body 11a is supported by the drum support shaft 9 so as to be able to rotate integrally with the drum support shaft 9 and to be relatively movable in the axial direction. The side plate 11b is provided with, for example, a block-shaped guide portion 10 that is attached to the outer surface in the axial direction. The guide portion 10 includes a rib-shaped guide rail 10a that can guide one side end edge of each of the radial moving pieces 15 inward and outward in the radial direction. In addition, as the guide part 10, a guide groove extending inward and outward in the radial direction is provided, and a guide rail guided by the guide groove is provided on one side edge of the radial direction moving piece 15. Things can be adopted.

  As shown in FIGS. 3 and 4, the slide body 12 is a tapered cone-shaped block body, which can rotate integrally with the sleeve body 11a and can slide in and out of the axial direction. It is supported by the sleeve body 11a. The slide body 12 is in airtight contact with the outer peripheral surface of the sleeve main body portion 11a via the seal material 16, and the shaft 12 is disposed on the inside of the slide body 12 and on the rear side in the axial direction from the seal material 16. A concentric inner hole 12a is formed which opens at the rear end in the core direction and can form an air chamber H with the outer peripheral surface of the sleeve body 11a. The rear end in the axial direction of the air chamber H is sealed with a disk-shaped cap 11c that rises from the outer peripheral surface of the sleeve main body 11a. For example, the slide body 12 can be slid in the axial direction by sucking / exhausting high-pressure air into / from the air chamber H from an intake / exhaust port (not shown) provided in the cap 11c.

  The slide body 12 includes a guide surface portion 20 that is inclined radially outwardly toward the axially outer side at the axially inner end portion thereof. The guide surface portion 20 includes first and second inclined surface portions 20A and 20B that are different in inclination and are alternately arranged in the circumferential direction. In the present example, the second inclined surface portion 20B is the guide surface portion. It is formed as a single inclined surface 21 with a constant gradient that gently inclines at an angle of θ1 with respect to the axial direction from the inner end 20e1 in the axial direction.

  Further, the first inclined surface portion 20A includes a steeply inclined surface portion 22a on the inner side in the axial direction extending steeply at an angle θ2 larger than the angle θ1 with respect to the axial direction from the inner end 20e1, and the steeply inclined surface portion. It is formed as a bent surface 22 formed of a flat surface portion 22b on the outer side in the axial direction extending to the axial direction and extending at an angle of 0 ° with respect to the axial direction. The steeply inclined surface portion 22a and the flat surface portion 22b are smoothly connected via an arc portion.

  Next, the radial moving piece 15 includes a first moving piece 15A having the first segment 2A attached to the radially outer end thereof, and a second moving piece 15B having the second segment 2B attached thereto. Consists of. The first and second moving pieces 15A and 15B have substantially the same configuration. In this example, the first and second moving pieces 15A and 15B have a rectangular plate-shaped main body portion 15a and the guide rail 10a at the inner end in the axial direction. It is possible to move inward and outward in the radial direction.

  The first and second moving pieces 15A and 15B have engaging portions 14 that engage with the guide surface portion 20 at the radially inner ends. In this example, the engaging portion 14 includes a roller 30 pivotally attached to the radially inner end portion of the main body portion 15a, whereby the first inclined surface portion 20A, which is the bent surface 22, is also provided. Smooth engagement is achieved. 2 is a spring body that connects adjacent moving pieces 15A and 15B and urges them radially inward, and can reliably bring the roller 30 into contact with the guide surface portion 20 when the diameter is reduced.

  FIG. 5 shows the relative movement of the roller 30 with respect to the slide body 12. The roller 30A of the first moving piece 15A rolls while being in contact with the first inclined surface portion 20A, and the first segment 2A is moved radially outward as the slide body 12 moves in the axial direction. Move towards. The roller 30B of the second moving piece 15B rolls in contact with the second inclined surface portion 20B, and the second segment 2B is moved radially outward as the slide body 12 moves in the axial direction. Can be moved towards.

  At this time, since the second inclined surface portion 20B forms a single inclined surface 21 having an inclination angle θ1, the roller 30B moves inward and outward in the radial direction at a constant speed between the reduced diameter state Yr and the expanded diameter state Ye. . That is, the second segment 2B moves inward and outward in the radial direction at a constant speed between the reduced diameter state Yr and the expanded diameter state Ye.

  On the other hand, the first inclined surface portion 20A includes a steeply inclined surface portion 22a on the inner side in the axial direction and an outer flat surface portion 22b, and the inclination angle θ2 of the steeply inclined surface portion 22a is the single inclined surface 21. Is set larger than the inclination angle θ1. Accordingly, at the time of diameter expansion, the roller 30A can move outward in the radial direction at a speed higher than that of the roller 30B, and can reach the diameter expansion position Pe earlier than the roller 30B. Specifically, the roller 30A moves outward in the radial direction while gradually increasing the separation distance K outward from the roller 30B in the radial direction due to the difference in inclination angle (θ1−θ2). In the state Y1 where the roller 30A reaches the flat surface portion 22b, the separation distance K becomes the maximum Kmax, and in this arrival state Y1, the first segment 2A can reach the diameter-expanded position Pe. That is, at the time of diameter expansion, the first segment 2A moves outward in the radial direction at a speed faster than that of the second segment 2B, and can reach the diameter expansion position Pe earlier than the second segment 2B. In FIG. 5, the enlarged diameter position Pe and the reduced diameter position Pr are replaced with the enlarged diameter position Pe and the reduced diameter position Pr in the rollers 30A and 30B.

  When the diameter is reduced, the steeply inclined surface portion 22a has a flat surface portion 22b having an angle of 0 °, so that the roller 30A can start moving radially inward from the expanded diameter position Pe later than the roller 30B. That is, the first segment 2A can start moving inward in the radial direction from the enlarged diameter position Pe later than the second segment 2B. As described above, the first and second segments 2A and 2B can be moved at different timings and speeds. Therefore, during the movement, between the side end surfaces 5 and 6 of the first and second segments 2A and 2B. The gap between the side end faces 5 and 6 can be suppressed.

Next, another comparative example of the guide surface portion 20 is shown in FIG. In FIG. 6, the first inclined surface portion 20A is connected to the inclined surface portion 22c on the inner side in the axial direction extending from the inner end 20e1 of the guide surface portion 20 with respect to the axial direction with respect to the axial direction, and to the inclined surface portion 22c. It is formed as a bent surface 22 including a flat surface portion 22b on the outer side in the axial direction extending at an angle of 0 ° with respect to the axial direction. The second inclined surface portion 20B includes a flat surface portion 23b on the inner side in the axial direction extending from the inner end 20e1 at an angle of 0 ° with respect to the axial direction, and an inclined angle connected to the flat surface portion 23b and inclined with respect to the axial direction. It is formed as a bent surface 23 composed of an inclined surface portion 23a on the outer side in the axial direction extending at θ4. In the present example, the inclination angle θ4 is equal to the inclination angle θ3, but may be different.

  In this case, at the time of diameter expansion, the second segment 2B starts moving radially outward from the reduced diameter position Pr later than the first segment 2A, and later than the first segment 2A. It can arrive at the enlarged diameter position Pe. That is, the first and second segments 2A and 2B can be moved at different timings, and the occurrence of wear between the side end faces 5 and 6 during the movement can be suppressed.

  The inclination angles θ1 to θ4 are not particularly limited, but are preferably about 45 ° ± 10 ° for smooth diameter expansion operation, and the difference (θ2−θ1) is preferably in the range of 1 to 10 °.

  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.

2 segment 2A first segment 2B second segment 2G segment group 3 expansion / contraction means 5 receiving surface 6 abutting surface 10 guide portion 11 drum support shaft member 12 slide body 14 engaging portion 15 radially moving piece 15A first movement Piece 15B Second moving piece 20 Guide surface portion 20A First inclined surface portion 20B Second inclined surface portion 21 Single inclined surface 22a Steeply inclined surface portion 22b Flat surface portion Pe Expanded position S Outer surface Yr Reduced diameter state Ye Expanded state

Claims (1)

It consists of a plurality of segments that can move between a reduced diameter state in which the outer surface is reduced in diameter and an expanded state in which the outer surface is enlarged by being divided in the circumferential direction and moved inward and outward in the radial direction by the expanding and reducing means. A tire constituting member can be formed by winding one or more sheet-like bodies for forming a tire on the outer surface in the circumferential direction in the expanded diameter state, and the tire constituting member can be formed in the reduced diameter state. A tire molding drum from which components can be removed,
The segment group is
A first segment having a large circumferential width having a receiving surface inclined in a direction to reduce the circumferential width inward in the radial direction at both circumferential ends;
The first segments are alternately arranged in the circumferential direction, and are located radially inward of the first segment in the reduced diameter state, and are circumferentially directed radially inward at both circumferential ends. A second segment having a small circumferential width having an abutting surface in contact with the receiving surface in the diameter-enlarged state and inclined in the direction of increasing the direction width;
Moreover, the expansion / contraction means is
A drum support shaft member having a guide portion extending radially inward and outward;
A cone-shaped slide body which is guided by the drum support shaft member so as to be movable inward and outward in the axial direction and has a guide surface portion which is inclined radially outwardly toward the axially outward direction at an axially inner end portion; ,
By having an engaging portion that is movably guided inward and outward in the radial direction by the guide portion and that engages with the guide surface portion at the radially inner end portion, the slide body moves inward in the axial direction in the axial direction. A plurality of radially moving pieces that can move to
The radial moving piece includes a first moving piece having the first segment attached to a radially outer end portion and a second moving piece having the second segment attached thereto.
The guide surface portion includes a first inclined surface portion that can be engaged with an engaging portion of the first moving piece, an inclination portion different from the first inclined surface portion, and an engaging portion of the second moving piece. Ri Do and a second inclined surface portion capable of being engaged,
The second inclined surface portion is formed of a single inclined surface having a constant gradient that is gently inclined at an angle of θ1 with respect to the axial direction from the inner end in the axial direction of the guide surface portion.
The first inclined surface portion includes a steeply inclined surface portion on the inner side in the axial direction that is steeply inclined at an angle θ2 larger than the angle θ1 with respect to the axial direction from the inner end in the axial direction of the guide surface portion, and the axial direction And a flat surface portion on the outer side in the axial direction in which the angle with respect to 0 is 0 °,
At the time of diameter expansion, the first segment arrives at the diameter expansion position before the second segment, and in this diameter expansion position, the first moving piece engages with the flat surface portion, and The second moving piece engages with the single slope,
A tire forming drum characterized in that when the diameter is reduced, the first segment starts to move inward in the radial direction from the enlarged diameter position later than the second segment.

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