JP5084637B2 - Non-pneumatic tire mold and non-pneumatic tire manufacturing method - Google Patents

Description

  The present invention relates to a molding die used for manufacturing a non-pneumatic tire including a support structure that supports a load from a vehicle as a tire structure member, and a method for manufacturing the non-pneumatic tire.

  The pneumatic tire has a load supporting function, a shock absorbing ability from the ground contact surface, and a transmission ability (acceleration, stop, change of direction) such as power. For this reason, many vehicles, particularly bicycles, motorcycles, automobiles, It is used in trucks.

  In particular, these capabilities greatly contributed to the development of automobiles and other motor vehicles. Furthermore, the impact absorbing ability of pneumatic tires is useful for medical equipment and electronic equipment transport carts and other applications.

  Conventional non-pneumatic tires include, for example, solid tires, spring tires, cushion tires, and the like, but do not have the superior performance of pneumatic tires. For example, solid tires and cushion tires support the load by compressing the contact portion, but this type of tire is heavy and stiff, and does not have the ability to absorb shock like a pneumatic tire. Further, in the non-pneumatic tire, it is possible to improve the cushioning property by increasing the elasticity, but there is a problem that the load supporting ability or the durability as the pneumatic tire has is deteriorated.

  Therefore, in Patent Document 1 below, for the purpose of developing a non-pneumatic tire having the same operating characteristics as a pneumatic tire, a reinforced annular band that supports a load applied to the tire, and the reinforced annular band, Non-pneumatic tires have been proposed that have a plurality of web spokes that transmit load forces by tension with a wheel or hub. And also about a web spoke, the point which reinforces rubber | gum etc. is disclosed in order to raise a tensile elasticity modulus.

  However, since the non-pneumatic tire described in Patent Document 1 has a gap between web spokes adjacent to each other in the circumferential direction, the rigidity of the annular band is reduced in the region between the web spokes. Bands cause buckling between web spokes, causing vibration and noise, abnormal wear on the tread, and damage.

  In order to prevent such buckling between web spokes, the following Patent Document 2 discloses intermittently fins that are radially connected between an annular outer peripheral member and an inner peripheral member at intervals in the circumferential direction. In addition, a non-pneumatic tire is described in which a spoke structure arranged in a row is divided into a plurality of bands in the tire width direction, and fin positions are shifted from each other in the circumferential direction between adjacent bands. According to this configuration, the fins displaced in the circumferential direction from each other act to improve the rigidity of the outer peripheral member between the fins in the adjacent band. Can be prevented.

Special Table 2005-500932 Publication JP 2008-55928 A

  By the way, in the non-pneumatic tire described in Patent Document 2, the spoke structure is formed by accumulating and bonding a plurality of unit structures in units of structures divided into a plurality of bands in the tire width direction. Yes.

  However, since such a spoke structure is constructed by accumulating and bonding unit structures divided into a plurality of bands, there is a problem in durability, and the manufacturing process becomes complicated, and there is a concern that the productivity is lowered. Is done.

  Accordingly, an object of the present invention is to provide a non-pneumatic tire mold and a non-pneumatic tire manufacturing method capable of improving durability of a non-pneumatic tire, simplifying a manufacturing process, and improving productivity. .

The above object can be achieved by the present invention as follows.
That is, the non-pneumatic tire molding die of the present invention includes an inner annular portion, an outer annular portion provided concentrically on the outer side of the inner annular portion, and a plurality of connecting the inner annular portion and the outer annular portion. A mold for use in the manufacture of a non-pneumatic tire comprising a support structure comprising a connecting portion of an inner mold part for molding the inner annular part and an outer part for molding the outer annular part The mold includes a mold part, and a plurality of first mold parts and a plurality of second mold parts for molding the connecting part, and the first mold part and the second mold part are opposed to each other in the tire width direction. In the closed state, the second mold part is in contact with another pair of first mold parts adjacent to each other in the tire circumferential direction at least one surface is in contact with the paired first mold part. At least one surface is in contact, and the space corresponding to the connecting portion extends in the tire circumferential direction. Each independently of the fine tire width direction, characterized in that it is configured offset from one another in the circumferential direction of the tire for each band which are divided in the tire width direction.

  The mold for a non-pneumatic tire of the present invention includes an inner mold part, an outer mold part, a plurality of first mold parts, and a plurality of second mold parts, and the first mold part and the second mold part. And a pair facing each other in the tire width direction. In the mold closed state, it is possible to configure a space portion that is independent in the tire circumferential direction and the tire width direction, and is shifted from each other in the tire circumferential direction for each band divided in the tire width direction. The space portion was filled with an elastic material raw material and cured, and the molded product was removed from the mold (demolded), thereby being provided concentrically around the inner annular portion and the outer annular portion. The outer annular portion, the inner annular portion and the outer annular portion are connected, each of which is independent in the tire circumferential direction and the tire width direction, and is shifted from each other in the tire circumferential direction for each band divided in the tire width direction. A non-pneumatic tire provided with a support structure composed of a connecting portion can be manufactured. Therefore, according to the non-pneumatic tire molding die of the present invention, the support structure is integrally molded without a seam compared to the conventional method in which unit structures divided into a plurality of zones are stacked and bonded together to obtain the support structure. Therefore, the durability of the non-pneumatic tire can be improved. In addition, a plurality of processes such as a unit structure molding process, a bonding surface processing process, an adhesive application process, and a unit structure accumulation process are not required, and the manufacturing process can be simplified and the productivity can be improved. .

  In the mold for a non-pneumatic tire of the present invention, it is preferable that the first mold part and the second mold part are separated in the tire radial direction on the same circumference. According to this configuration, the first mold part and the second mold part are provided concentrically between the inner annular part and the outer annular part using the gap generated by separating in the tire radial direction. The formed intermediate annular portion can be easily formed. Since the intermediate annular portion connects and reinforces the connecting portions adjacent to each other in the tire circumferential direction, the durability of the non-pneumatic tire can be further improved.

  In the mold for a non-pneumatic tire according to the present invention, at least one of the first mold part and the second mold part includes a step part having a different height in the tire width direction, and is opposed to the step part. It is preferable to be in contact with the other mold part. According to this configuration, at least one step portion of the paired first mold portion and second mold portion is in contact with the other mold portion, so that this portion has a space portion even when the mold is closed. Is not formed. That is, according to this configuration, it is possible to easily form a space portion that is independent in the tire circumferential direction and the tire width direction and that is shifted from each other in the tire circumferential direction for each band divided in the tire width direction.

  In the mold for a non-pneumatic tire of the present invention, a first side mold part for molding one side part of the support structure and a second side part for molding the other side part of the support structure. It is preferable that the first mold part is coupled to the first side mold part, and the second mold part is coupled to the second side mold part. According to this configuration, the first mold part and the second mold part that form a pair can be positioned with high accuracy and can be brought into contact with each other appropriately, so that productivity can be improved. it can.

  On the other hand, the manufacturing method of a non-pneumatic tire of the present invention includes an inner annular portion, an outer annular portion provided concentrically on the outer side of the inner annular portion, and a plurality of connecting the inner annular portion and the outer annular portion. A non-pneumatic tire manufacturing method comprising a support structure composed of a connecting portion of an outer mold, and an outer mold for molding the outer annular portion outside the inner mold portion for molding the inner annular portion The parts are arranged concentrically, and between the inner mold part and the outer mold part, a first mold part and a second mold part that are opposed to each other in the tire width direction are arranged, A mold closing step for forming a space portion corresponding to the inner annular portion, the outer annular portion and the connecting portion; and a filling step for filling the space portion corresponding to the inner annular portion, the outer annular portion and the connecting portion with a raw material liquid of an elastic material; In the mold closing step, the second mold part is paired By contacting at least one surface with one mold part and at least one surface with another pair of first mold parts adjacent to each other in the tire circumferential direction, a space corresponding to the connecting part is formed in the tire circumferential direction and Each of them is independent in the tire width direction, and each band divided in the tire width direction is formed so as to be shifted from each other in the tire circumferential direction.

  The operation and effect of the non-pneumatic tire manufacturing method having such a configuration is as described above. According to the non-pneumatic tire manufacturing method of the present invention, the unit structures divided into a plurality of zones are integrated and bonded and supported. Compared to a conventional method for obtaining a structure, the support structure can be integrally formed without a seam, so that the durability of the non-pneumatic tire can be improved. In addition, a plurality of processes such as a unit structure molding process, a bonding surface processing process, an adhesive application process, and a unit structure accumulation process are not required, and the manufacturing process can be simplified and the productivity can be improved. .

  In the method of manufacturing a non-pneumatic tire of the present invention, after injecting the raw material liquid of the elastic material in a state where the inner mold part, the outer mold part, and the first mold part are arranged on the same surface, It is preferable to perform the mold closing step and the filling step simultaneously by bringing the second mold portion into contact with the first mold portion. According to this configuration, since the mold closing process and the filling process can be performed simultaneously, productivity can be improved. In addition, in the method of filling the raw material liquid of the elastic material after the mold closing process is finished, if the viscosity of the raw material liquid is high, there is a possibility that the raw material liquid cannot be filled to every corner of the space portion, and the filling time is long. Although there is a problem such as this, according to this configuration, the space portion can be easily filled with the raw material liquid of the elastic material.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the configuration of the non-pneumatic tire manufactured by the mold and the manufacturing method of the present invention will be described. FIG. 1 shows an example of a non-pneumatic tire, where (a) is a front view and (b) is a side view. Here, O indicates an axis.

  The non-pneumatic tire T includes a support structure SS that supports a load from the vehicle. The non-pneumatic tire T may include a member corresponding to a tread, a reinforcing layer, a member for fitting with an axle or a rim, and the like on the outer side (outer peripheral side) and the inner side (inner peripheral side) of the support structure SS. .

  As shown in the front view of FIG. 1, the non-pneumatic tire T according to the present embodiment includes an inner annular portion 1, an intermediate annular portion 2 provided concentrically on the outer side thereof, and an outer side thereof. A concentric outer ring portion 3, an inner ring portion 1 and an intermediate ring portion 2, a plurality of connecting portions 4 which are independent in the tire circumferential direction, an outer ring portion 3 and an intermediate ring portion 2, respectively. And a plurality of connecting portions 5 that are independent of each other in the tire circumferential direction.

  It is preferable to provide the connection parts 4 and 5 with a fixed space | interval in a tire peripheral direction from a viewpoint of improving a uniformity. Moreover, the shape of each connection part 4 and 5 is a plate-shaped body, and is extended so that it may continue in a tire radial direction in a front view cross section.

  In addition, the intermediate | middle annular part 2 is not necessarily required, and when there is no intermediate | middle annular part 2, the connection part 4 and the connection part 5 connect the inner side annular part 1 and the outer side annular part 3 directly as one connection part. To do. It is also possible to provide a plurality of intermediate annular portions 2.

  The connecting portions 4 and 5 are independent from each other in the tire width direction, and are shifted from each other in the tire circumferential direction for each band divided in the tire width direction. That is, the coupling portion between the connecting portion 5 and the outer annular portion 3 is shifted from each other in the tire circumferential direction for each band divided in the tire width direction, as indicated by a broken line in the side view of FIG. Here, an example is shown in which the band is divided into three in the tire width direction. In FIG. 1A, for convenience of explanation, only the connecting portions 4 and 5 in the foremost band are shown.

  In the present embodiment, as shown in FIG. 1, an example is shown in which a reinforcing layer 6 that reinforces bending deformation of the outer annular portion 3 is provided outside the outer annular portion 3 of the support structure SS. Moreover, in this embodiment, as shown in FIG. 1, the example in which the tread layer 7 is provided in the further outer side of the reinforcement layer 6 is shown. As the reinforcing layer 6 and the tread layer 7, it is possible to provide the same layers as those of a conventional pneumatic tire belt layer. Moreover, it is possible to provide the same pattern as a conventional pneumatic tire as a tread pattern.

  According to the present invention, as will be described later, since the support structure SS is integrally formed of an elastic material, the inner annular portion 1, the intermediate annular portion 2, the outer annular portion 3, and the connecting portions 4 and 5 are made of the same material. Become.

  Examples of the material of the support structure SS include a thermoplastic elastomer, a crosslinked rubber, other resins, or a fiber reinforcing material obtained by reinforcing these with a reinforcing material such as a fiber.

  Examples of the thermoplastic elastomer include polyester elastomer, polyolefin elastomer, polyamide elastomer, polystyrene elastomer, polyvinyl chloride elastomer, polyurethane elastomer and the like. Rubber materials constituting the crosslinked rubber material include natural rubber, styrene butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IIR), nitrile rubber (NBR), hydrogenated nitrile rubber (hydrogenated NBR). And synthetic rubbers such as chloroprene rubber (CR), ethylene propylene rubber (EPDM), fluorine rubber, silicon rubber, acrylic rubber, and urethane rubber. These rubber materials may be used in combination of two or more as required.

  Examples of other resins include thermoplastic resins and thermosetting resins. Examples of the thermoplastic resin include polyethylene resin, polystyrene resin, and polyvinyl chloride resin, and examples of the thermosetting resin include epoxy resin, phenol resin, polyurethane resin, silicon resin, polyimide resin, and melamine resin.

  Of the above elastic materials, a polyurethane resin is preferably used from the viewpoint of moldability / workability and cost. In addition, as an elastic material, you may use a foaming material, The thing which foamed said thermoplastic elastomer, crosslinked rubber, and other resin can also be used.

  According to the shaping | molding die and manufacturing method which concern on this invention, the above non-pneumatic tires T can be manufactured suitably. Hereinafter, the mold and manufacturing method of the non-pneumatic tire T will be described with reference to the drawings.

<First Embodiment>
FIG. 2 shows a state in which the mold according to the first embodiment is separated into an upper mold and a lower mold. FIG. 2A shows the lower mold, and FIG. 2B shows the upper mold. FIG. 2 shows a plan view and a sectional view side by side. FIG. 3 is a perspective view showing the appearance of a pair of first mold part and second mold part.

  As shown in FIG. 2 (a), the lower mold of the mold includes a lower surface mold part 10 (corresponding to a first side mold part), a plurality of first mold parts 11, an inner mold part 12, The outer mold part 13 is configured. The lower surface mold part 10 molds one of the side parts of the support structure SS in the tire width direction. The lower surface mold part 10 has a disk shape, and a plurality of first mold parts 11 are coupled so as to be arranged at equal intervals in the circumferential direction. Detailed description of the first mold part 11 will be described later. Moreover, the inner side mold part 12 is for shape | molding the inner peripheral side of the inner side annular part 1, and is carrying out the cylindrical shape. The outer mold part 13 is for molding the outer peripheral side of the outer annular part 3 and has a cylindrical shape. The inner mold part 12 and the outer mold part 13 have the same height, and can simultaneously contact the upper mold part 20 in the mold closed state.

  As shown in FIG. 2 (b), the upper mold of the mold is composed of a top mold part 20 (corresponding to a second side mold part) and a plurality of second mold parts 21. The upper surface mold part 20 forms the other of the side parts in the tire width direction of the support structure SS. The upper surface mold part 20 has a disk shape, and a plurality of second molding mold parts 21 are coupled so as to be arranged at equal intervals in the circumferential direction.

  The 1st shaping | molding die part 11 and the 2nd shaping | molding die part 21 have made a pair, The shape has become like the perspective view of FIG. The 1st shaping | molding die part 11 is carrying out the step shape (L shape) provided with the step part 11a which changed height in the tire width direction, and the 2nd shaping | molding die part 21 is also the tire width direction. It has a staircase shape (L shape) with stepped portions 21a having different heights. The step portions 11 a and 21 a are provided substantially parallel to the lower surface mold portion 10 and the upper surface mold portion 20.

  The first mold part 11 and the second mold part 21 constitute a space part for molding the inner annular part 1 together with the inner mold part 12, and mold the outer annular part 3 together with the outer mold part 13. The space part is configured.

  The plurality of first mold parts 11 and the plurality of second mold parts 21 are arranged in the circumferential direction at equal intervals. A space portion for forming the connecting portions 4 and 5 arranged in the tire radial direction is formed by the gaps provided at equal intervals.

  Moreover, the 1st shaping | molding die part 11 and the 2nd shaping | molding die part 21 are isolate | separated to the tire radial direction on the same circumference, respectively, and the clearance gaps 11b and 21b are formed. A space for forming the intermediate annular portion 2 can be formed by the gaps 11b and 21b.

  FIG. 4 shows a contact state between the first mold part 11 and the second mold part 21 in a state where the upper mold and the lower mold are closed (mold closed state). FIG. 4 is a view of the first mold part 11 and the second mold part 21 as seen from the outer peripheral side in the tire radial direction, but the outer mold part 13 is omitted for convenience of explanation.

  The step part 11a of the first mold part 11 is in surface contact with the upper end part 21c of the second mold part 21 forming a pair. Further, the step portion 21 a of the second mold part 21 is in surface contact with the upper end part 11 c of the first mold part 11 that forms a pair. On the other hand, a part of the side part 21d of the second mold part 21 is in surface contact with a part of the side part 11d of another pair of first mold parts 11 adjacent in the tire circumferential direction. Since the first mold part 11 and the second mold part 21 are in the contact state as described above, the tires are independent in the tire circumferential direction and the tire width direction, and are divided into tires for each band divided in the tire width direction. Space portions that are shifted from each other in the circumferential direction can be formed.

  A method for manufacturing the non-pneumatic tire T will be described. FIG. 5 shows a manufacturing process of the support structure SS.

  First, as shown in FIG. 5A, the inner mold part 12 and the outer mold part 13 are arranged on the lower mold part 10 to which the first mold part 11 is coupled. The lower surface mold part 10, the inner mold part 12, and the outer mold part 13 are all arranged concentrically. In FIG. 5, the inner mold part 12 and the outer mold part 13 are not shown.

  Next, a predetermined amount of the elastic material solution 30 is injected into a space formed by the lower surface mold part 10, the first mold part 11, the inner mold part 12, and the outer mold part 13. Examples of the raw material liquid for the elastic material include those obtained by softening the above-described elastic material at a high temperature, and liquid raw materials before reaction curing or before crosslinking.

  Next, before the thickening / curing of the injected raw material liquid 30 starts, the second mold part 21 coupled to the upper surface mold part 20 is brought close to the first mold part 11 from above. At this time, as shown in FIG. 5 (b), the upper end portion 21c and the step portion 21a of the second mold portion 21 are close to the step portion 11a and the upper end portion 11c of the first mold portion 11, respectively. I will let you. Further, the first and second mold parts 11 are in contact with the side surface part 11d of the first mold part 11 and the side part 21d of another pair of second mold parts 21 adjacent in the tire circumferential direction. , 21 are moved closer together.

  In this way, by bringing the second mold part 21 close to the first mold part 11 from above, the raw material liquid 30 accumulated on the step part 11a of the first mold part 11 at the beginning of injection is The gap between the pair of first mold parts 11 and the second mold part 21 is raised so as to be pushed by the upper end part 21 c of the second mold part 21, and the upper end part 11 c of the first mold part 11 is It flows in the direction. Further, the raw material liquid 30 on the upper end portion 11 c of the first mold part 11 is pushed by the step part 21 a of the second mold part 21, and the gap between the adjacent second mold parts 21 rises. Then, it flows in the direction of the upper surface mold part 20.

  As shown in FIG. 5C, the first mold part 11 and the second mold part 21 finally have a step 11a of the first mold part 11 paired with the second mold part 21. The upper end part 21c is brought into surface contact with the upper end part 11c until the upper end part 11c of the first mold part 11 comes into surface contact with the stepped part 21a of the second mold part 21 making a pair. Thereby, in the mold closed state, a space portion that is independent in each of the tire circumferential direction and the tire width direction and is displaced from each other in the tire circumferential direction for each of the zones divided in the tire width direction is formed. The material raw material liquid 30 is filled. That is, the mold closing process and the filling process are performed simultaneously.

  Next, the support structure SS can be obtained by solidifying and removing the raw material liquid 30 of the elastic material. Examples of the method for solidifying the raw material liquid 30 include reaction curing, heat curing, and cooling solidification. In order to facilitate demolding, it is effective to make the first mold part 11 and the second mold part 21 detachable from the lower surface mold part 10 and the upper surface mold part 20. After demolding, a post-cure process or the like can also be performed.

  Finally, the reinforcing layer 6 and the tread layer 7 are wound and joined to the outer peripheral surface of the outer annular portion 3 of the obtained support structure SS via an adhesive to form the non-pneumatic tire T. In addition, when the reinforcing layer 6 and the tread layer 7 are made of unvulcanized rubber, after being wound around the outer annular portion 3 of the support structure SS, vulcanization is performed with a hot press machine or the like.

  According to the present invention, the inner annular portion 1, the outer annular portion 3 provided concentrically outside the inner annular portion 1, the inner annular portion 1 and the outer annular portion 3 are connected, and the tire circumferential direction and A support structure SS composed of a plurality of connecting portions 4 and 5 that are independent in the tire width direction and are offset from each other in the tire circumferential direction for each of the bands divided in the tire width direction can be integrally formed. Therefore, the manufacturing process of the non-pneumatic tire T can be simplified and the productivity can be improved. Further, since the support structure SS has no seam, the durability of the non-pneumatic tire T including the support structure SS can be improved.

<Other embodiments>
(1) Second Embodiment In the first embodiment described above, the step portions 11a and 21a are provided in both the first mold portion 11 and the second mold portion 21, but either one of the molds is used. You may provide a step part only in a part. FIG. 6 shows an example in which the step portion 21 a is provided only in the second mold part 21.

  In 1st Embodiment, the connection parts 4 and 5 showed the example which each shifted | deviated mutually in the tire circumferential direction for every zone divided | segmented into 3 in the tire width direction independently in the tire width direction. On the other hand, in 2nd Embodiment, a connection part mutually differs in a tire width direction, and shift | deviates mutually in a tire circumferential direction for every zone | band divided into 2 in the tire width direction.

(2) Third Embodiment In the first embodiment described above, each of the first mold part 11 and the second mold part 21 is provided with stepped parts 11a and 21a, respectively. A stepped portion may be provided. FIG. 7 shows an example in which two steps are provided on each of the first mold part 11 and the second mold part 21.

  According to this configuration, as in the first embodiment, the connecting portions 4 and 5 that are independent in the tire width direction and are offset from each other in the tire circumferential direction for each of the three bands divided in the tire width direction are formed. can do. In addition, according to the present invention, it is easy to make the band into four or more by increasing the number of steps.

(3) Fourth Embodiment In the first embodiment described above, the step portions 11 a and 21 a of the first mold portion 11 and the second mold portion 21 are substantially parallel to the lower surface mold portion 10 and the upper surface mold portion 20. However, the step portions 11a and 21a are not limited to this shape. FIG. 8 shows an example in which the step portions 11 a and 21 a are provided obliquely with respect to the lower surface mold portion 10 and the upper surface mold portion 20.

  By the way, according to the mold parts 11 and 21 according to the first embodiment, the location where the second mold part 21 intersects with the side wall continuing from the step part 21a of the second mold part 21 to the upper end part 21c (FIG. 5). Air easily collects in the portion surrounded by the circle A in (b). That is, air that has lost its escape from the second mold part 21 and the raw material liquid 30 accumulates at this location, and the support structure SS is likely to be missing or voided.

  On the other hand, according to the mold parts 11 and 21 according to the fourth embodiment, since the step part 21a of the second mold part 21 is inclined, it is surrounded by a circle B in FIG. 8B. The air at the location is easy to escape upward, and the air is difficult to collect.

  (4) In the above-described embodiment, the raw material liquid 30 of the elastic material is placed in the space formed by the lower surface mold part 10, the first mold part 11, the inner mold part 12, and the outer mold part 13. A support structure SS is obtained by injecting a predetermined amount and bringing the second mold part 21 coupled to the upper surface mold part 20 close to the first mold part 11 from above to close the mold. Yes. However, the molds are closed in advance using all the mold parts, that is, the lower mold part 10, the first mold part 11, the inner mold part 12, the outer mold part 13, and the upper mold part 20 Then, a space part may be formed by the second molding die part 21 and the raw material liquid 30 of the elastic material may be injected and filled in the space part to obtain the support structure SS. That is, the filling step can be performed after the mold closing step is completed. In this case, the axis O may be horizontal and the upper mold and the lower mold may be supported from the left and right.

Front view and side view showing an example of non-pneumatic tire Front view and sectional view showing the configuration of the mold (lower mold) of the present invention Front view and sectional view showing the configuration of the mold (upper mold) of the present invention External perspective view of first mold part and second mold part Explanatory drawing for demonstrating the contact state of a 1st mold part and a 2nd mold part Explanatory drawing for demonstrating the manufacturing process of a non-pneumatic tire Explanatory drawing for demonstrating the other example (2nd Embodiment) of the shaping | molding die of this invention Explanatory drawing for demonstrating the other example (3rd Embodiment) of the shaping | molding die of this invention Explanatory drawing for demonstrating other examples (4th Embodiment) of the shaping | molding die of this invention

Explanation of symbols

T non-pneumatic tire SS support structure 1 inner annular part 2 intermediate annular part 3 outer annular part 4,5 connecting part 6 reinforcing layer 7 tread layer 10 lower surface mold part 11 first molding part 11a step part 12 inner molding part 13 Outer mold part 20 Upper mold part 21 Second mold part 21a Step part 30 Raw material liquid

Claims (6)

A support structure including an inner annular portion, an outer annular portion provided concentrically outside the inner annular portion, and a plurality of connecting portions that connect the inner annular portion and the outer annular portion is provided. A mold used for manufacturing a non-pneumatic tire,
An inner mold part for molding the inner annular part, an outer mold part for molding the outer annular part, a plurality of first mold parts and a plurality of second mold parts for molding the connecting part And
The first mold part and the second mold part are opposed to each other in the tire width direction,
In the mold closed state, the second mold part is in contact with at least one surface of the paired first mold part and at least one surface is in contact with another pair of first mold parts adjacent in the tire circumferential direction. The space portion corresponding to the connecting portion is independent in the tire circumferential direction and the tire width direction, and is configured to be shifted from each other in the tire circumferential direction for each band divided in the tire width direction. Non-pneumatic tire mold.   2. The non-pneumatic tire mold according to claim 1, wherein the first mold part and the second mold part are separated in the tire radial direction on the same circumference.   At least one of the first mold part and the second mold part includes a step part having a different height in the tire width direction, and the step part is in contact with the other mold part facing each other. Item 3. A mold for forming a non-pneumatic tire according to Item 1 or 2. A first side mold part for molding one side part of the support structure, and a second side mold part for molding the other side part of the support structure;
The non-pneumatic pressure according to any one of claims 1 to 3, wherein the first mold part is coupled to a first side mold part, and the second mold part is coupled to a second side mold part. Tire mold. A support structure including an inner annular portion, an outer annular portion provided concentrically outside the inner annular portion, and a plurality of connecting portions that connect the inner annular portion and the outer annular portion is provided. A non-pneumatic tire manufacturing method comprising:
The outer mold part for molding the outer annular part is arranged concentrically outside the inner mold part for molding the inner annular part, and between the inner mold part and the outer mold part, A mold closing step in which a first mold part and a second mold part that are paired facing each other in the tire width direction are disposed to form a space corresponding to the inner annular part, the outer annular part, and the connecting part;
Filling the space corresponding to the inner annular portion, the outer annular portion and the connecting portion with a raw material liquid of an elastic material, and
In the mold closing step, the second mold part is brought into contact with at least one surface with the paired first mold part and at least one surface with another pair of first mold parts adjacent in the tire circumferential direction. Thus, the space portion corresponding to the connecting portion is formed independently of each other in the tire circumferential direction and the tire width direction, and is formed so as to be shifted from each other in the tire circumferential direction for each band divided in the tire width direction. Non-pneumatic tire manufacturing method. After the inner mold part, the outer mold part, and the first mold part are arranged on the same surface and the raw material liquid of the elastic material is injected, the second mold part is inserted into the first mold part. The method for producing a non-pneumatic tire according to claim 5, wherein the mold closing step and the filling step are performed simultaneously by bringing them into contact with each other.

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