KR102677597B1 - Non-pneumatic tire with improved tread and spoke part bonding process efficiency and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a non-pneumatic tire with improved tread and spoke joining process efficiency and a manufacturing method thereof. More specifically, the present invention relates to a non-pneumatic tire with improved tread and spoke joining process efficiency, and more specifically, to a tread and spoke unit joining process efficiency improved by applying a thermosetting material for joining the tread and spoke. It relates to non-pneumatic tires and their manufacturing methods.

Description

Non-pneumatic tire with improved tread and spoke part bonding process efficiency and manufacturing method thereof}

The present invention relates to a non-pneumatic tire with improved tread and spoke joining process efficiency and a manufacturing method thereof. More specifically, the present invention relates to a non-pneumatic tire with improved tread and spoke joining process efficiency, and more specifically, to a tread and spoke unit joining process efficiency improved by applying a thermosetting material for joining the tread and spoke. It relates to non-pneumatic tires and their manufacturing methods.

Tires generally used in vehicles are pneumatic tires that allow elastic deformation by filling the inside with air. However, these pneumatic tires not only have a complicated structure, but also have the inconvenience of having to frequently check the air pressure, which is absolutely important for performance and safety. Additionally, there is a safety issue in that tires may be damaged during driving due to ground flexion or driving impacts depending on driving conditions.

In contrast, non-pneumatic tires are a design method that does not use compressed air at all and are proposed to be applied to vehicles, providing the advantage of being free from the risk of accidents that may occur during driving due to loss or lack of air pressure.

Such non-pneumatic tires have been proposed in various ways, such as Domestic Public Patent No. 10-1993-0017732 and Domestic Registered Utility Model No. 20-0129135.

In general, non-pneumatic tires consist of a spoke portion that supports the load and forms a cushion layer, and a tread portion that is in contact with the road surface and is made of a material different from the spoke portion.

To manufacture a non-pneumatic tire, spokes are first formed and then a rubber tread is formed. In order to join the tread portion and the spoke portion to each other, first, the outer peripheral surface of the spoke and one side of the tread are each buffed, adhesive is applied to the outer peripheral surface of the spoke portion, cushion gum is attached, and the tread portion is attached to the spoke portion. After the enveloping operation of injecting appropriate high-pressure air into the envelope containing the spoke portion, it undergoes a vulcanization process.

However, when bonding the spoke portion and the tread portion, if an air layer is formed between the surfaces to be bonded to each other, the bonding does not occur properly.

Accordingly, care must be taken when applying adhesive to prevent an air layer from forming on the mutually bonded surface of the spoke and tread parts. In order to remove the air layer, great effort must be made in the rolling process and enveloping process to remove air. do.

As such, the process of manufacturing non-pneumatic tires is complex, and the buffing operation varies greatly, making it difficult to uniformly bond the tread and spokes, making mass production difficult.

In addition, liquid adhesives have a short bonding time when exposed to the outside, so the time to join the tread and spokes, which are made of different materials, must be quickly completed, making it difficult to distribute time across the entire process.

Republic of Korea Patent Publication No. 10-2231276: Adhesive composition and method for manufacturing non-pneumatic tires using the same

The present invention was created to solve the above problems. By using a thermosetting material between the tread portion and the spoke portion and bonding the tread portion and the spoke portion by heat compression, a buffing process is not required, and the tread portion and the spoke portion are bonded. The aim is to provide a non-pneumatic tire with improved tread and spoke joining process efficiency that is not limited by time constraints that require rapid joining, and a manufacturing method thereof.

A non-pneumatic tire with improved tread and spoke joining process efficiency of the present invention for achieving the above object includes a spoke portion formed of a thermoplastic material that is coupled to the wheel; a tread portion formed of a thermoplastic material whose inner peripheral surface is joined to the outer peripheral surface of the spoke portion and whose outer peripheral surface is in contact with the ground; A thermosetting adhesive portion is located between the spoke portion and the tread portion and is formed by heat curing a thermosetting hot melt film to be heat cured at 125 degrees to 135 degrees to bond the spoke portion and the tread portion,

The thermosetting adhesive portion includes a film body portion extending in length to a width corresponding to the outer peripheral surface of the spoke portion, a wire protruding from one side of the film body portion extending parallel to the longitudinal direction of the film body portion, and a wire embedded therein along the longitudinal direction. A plurality of first joining position guide protrusions, which protrude on the other side of the film body part to extend in parallel in the longitudinal direction of the film main body part, and which protrude at a position intersecting with the first joining position guide protrusion parts with the film main body part in between. A plurality of second joint position guide protrusions are formed on one side of the film body, extend in the width direction of the film body, and are spaced apart from each other in the longitudinal direction of the film body at regular intervals, and are mutually spaced in the width direction of the film body. A plurality of third joining position guide protrusions arranged alternately, extending in the width direction of the film body on the other side of the film body, spaced apart from each other in the longitudinal direction of the film body at regular intervals, and extending in the width direction of the film body, It is provided with a plurality of fourth joint position guide protrusions that are arranged alternately with the third joint position guide protrusion with the film body part in between, and the spoke portion is disposed to correspond to the second and fourth joint position guide protrusions. Second and fourth joint position guide grooves are formed recessed, respectively, and the tread portion is formed with first and third joint position guide grooves recessed corresponding to the first and third joint position guide protrusions, respectively. do.

The first to fourth joint position guide grooves communicate with a guide portion whose width becomes narrower in the direction in which it is retracted, and an end portion in the direction in which the guide portion is retracted, and are located on both sides around the end of the guide portion so as to have a width greater than that of the end portion. It is provided with a separation prevention part inserted into the first, second, third or fourth joint position guide protrusion, and the other end in contact with the film main body such that one side in the direction in which it protrudes when melted is filled with the separation prevention part. It is preferable that the width corresponds to or is larger than the largest width of the guide part and protrudes from the film body longer than the depth drawn from the guide part to the separation prevention part.

The method of manufacturing a non-pneumatic tire with improved tread and spoke joining process efficiency of the present invention includes a spoke molding step of molding spokes formed of a thermoplastic material; A tread portion forming step of forming a ring-shaped tread portion made of a thermoplastic material and having a constant width; A polyurea-based solvent-based adhesive is applied to form a thermosetting joint made of a thermosetting material between the ring-shaped tread portion and the spoke portion located within the diameter of the tread portion, or a thermosetting hot melt film is placed and then heat-pressed to form a thermosetting adhesive on the tread. A step of bonding a spoke portion and a tread portion using a thermosetting material for joining the spoke portion and the spoke portion, wherein the thermosetting adhesive portion includes a film body portion extending in length to a width corresponding to the outer peripheral surface of the spoke portion, and one surface side of the film body portion. It is preferable to include a plurality of joining position guide protrusions that protrude in parallel in the longitudinal or width direction of the film body and have wires embedded therein along the longitudinal direction.

The step of joining the spoke portion and the tread portion includes a spoke portion fixing step of mounting the spoke portion to the spoke holder of the tread portion expansion device; After entering the plurality of expansion support pieces arranged in the circumferential direction of the tread portion expansion device into the inner diameter of the tread portion, the plurality of expansion support pieces are mutually aligned in the circumferential direction so that the tread portion is expanded to have an outer diameter larger than the spoke portion. A tread portion diameter expansion fixing step of moving the plurality of expansion support pieces in a radial direction so that the separation distance is expanded; A thermosetting joint application or placement step of applying or placing the thermosetting joint on the outer peripheral surface of the spoke portion mounted on the spoke holder; A tread portion moving step of moving the tread portion so that the tread portion with an expanded inner diameter is positioned around the spoke portion; After moving a plurality of pressure pieces of the tread portion expansion device arranged in each area between the expansion support pieces radially so that one side of the tread portion in contact with the pressure pieces comes into close contact with the spoke portion, the expansion support pieces are The expansion support pieces are retreated away from the spoke portion in the width direction of the tread portion so as to be separated between the tread portion and the spoke portion, and the pressure pieces are moved radially to be spaced apart from the tread portion and then moved away from the spoke portion. A tread portion diameter reduction step of retracting and fixing the tread portion on the spoke portion; A bonding step of applying heat of 125 to 135 degrees to heat-cure the polyurethane-based solvent-based adhesive or the thermosetting hot melt film positioned between the spoke portion and the tread portion and heat-pressing the spoke portion and the tread portion to be bonded to each other. It is desirable.

The non-pneumatic tire with improved tread and spoke bonding process efficiency of the present invention has a tread portion formed of thermoplastic elastomer and the tread portion and spoke portion are bonded to each other using a thermosetting adhesive material, so the mutual bonding strength of the tread portion and the spoke portion can be improved. there is.

In addition, in the method of manufacturing a non-pneumatic tire with improved tread and spoke joining process efficiency of the present invention, the tread part is formed of thermoplastic elastomer and the tread part and spoke part are bonded using a thermosetting adhesive material, so buffing is performed on the spoke part and the tread part. Even without a process, the bonding strength of the tread and spoke parts can be improved, and the overall curing time of the spoke parts can be shortened.

In addition, the method of manufacturing a non-pneumatic tire with improved tread and spoke bonding process efficiency of the present invention uses a thermosetting hot melt film, which improves adhesion efficiency because there is less risk of foam generation than liquid polymer, thereby reducing the total curing time of the spoke portion. can be further simplified.

1 is a block diagram of a method of manufacturing a non-pneumatic tire with improved tread and spoke joining process efficiency according to the first embodiment of the present invention;
Figure 2 is a partially separated perspective view of a non-pneumatic tire manufactured through the non-pneumatic tire manufacturing method of Figure 1;
Figure 3 is a block diagram of the spoke part and tread part joining step of the non-pneumatic tire manufacturing method of Figure 1,
Figure 4 is a perspective view of the tread part expansion device applied to the step of joining the spoke part and the tread part of Figure 3;
Figure 5 is a diagram showing a state in which the diameter of the tread part is expanded in the tread part expansion device of Figure 4;
Figure 6 is a diagram showing a state in which the tread part is pressed by a pressure piece in the tread part expansion device of Figure 4;
Figure 7 is a partial cross-sectional view for explaining the radial movement structure of the expansion support piece in the tread expansion device of Figure 4;
Figure 8 is a partial cross-sectional view along AA' of a non-pneumatic tire according to the first embodiment of the present invention,
9 is a partial cross-sectional view along B-B' of a non-pneumatic tire according to the first embodiment of the present invention;
Figure 10 is a partial cross-sectional view taken along line C-C' of a non-pneumatic tire according to the first embodiment of the present invention;
Figure 11 is a partially separated cross-sectional view showing the state before the tread portion, spoke portion, and thermosetting adhesive portion of the non-pneumatic tire according to the second embodiment of the present invention are coupled to each other;
Figure 12 is a partial cross-sectional view of a non-pneumatic tire according to a second embodiment of the present invention.

Hereinafter, a non-pneumatic tire with improved tread and spoke joining process efficiency and a manufacturing method thereof according to a preferred embodiment of the present invention will be described in more detail with reference to the attached drawings.

1 to 10 show drawings of a non-pneumatic tire with improved tread and spoke joining process efficiency and a method of manufacturing the same according to the first embodiment of the present invention.

The non-pneumatic tire (1) with improved tread and spoke bonding process efficiency according to the first embodiment of the present invention includes a spoke portion (10) coupled to the wheel, an inner peripheral surface joined to the outer peripheral surface of the spoke portion (10), and an outer peripheral surface. A thermosetting adhesive portion located between the tread portion 20 in contact with the ground and the spoke portion 10 and the tread portion 20 and hardened at 125 to 135 degrees to join the spoke portion 10 and the tread portion 20. (30) is provided.

The tread portion 20 is injection molded by filling a first mold with a first molding resin, and is formed in a ring shape with a tread 21 formed on the outer peripheral surface. The first molding resin may be a thermoplastic resin, but it is preferable to use a thermoplastic elastomer (TPE).

The tread portion 20 includes a plurality of first joint position guide grooves 23 extending in the circumferential direction on the inner peripheral surface and spaced apart from each other in the width direction; A plurality of first joints between mutually adjacent first joint position guide grooves 23 or between the first joint position guide groove 23 located on one edge in the width direction among the plurality of first joint position guide grooves 23 and one end in the width direction. A plurality of third joint position guide grooves (25) extending in length in the width direction are formed between the first joint position guide groove (23) located at the other edge in the width direction among the position guide grooves (23) and the other end in the width direction. .

The plurality of third joint position guide grooves 25 are spaced apart from each other at regular intervals in the circumferential direction of the tread portion 20 and are formed at positions that cross each other in the width direction of the tread portion 20.

The spoke portion 10 is formed in a ring shape and has a wheel coupling portion 11 whose inner peripheral surface is coupled to a wheel connected to the wheel axle of the vehicle, and is formed in a ring shape on the outside of the wheel coupling portion 11 and includes a wheel coupling portion ( It is formed integrally with 11) and is disposed in a radial direction around the wheel coupled to the inside, and has a buffering portion 13 formed with a plurality of impact buffering holes 15, 17, and 19 spaced apart in the circumferential direction.

The raw material for molding the spoke portion 10 is a resin material, and a thermoplastic resin with rubber-type elasticity can be used. Considering the elasticity required during driving and moldability during manufacturing, it is preferable to use a thermoplastic elastomer. It is desirable.

For example, raw materials include amide-based thermoplastic elastomer (TPA), ester-based thermoplastic elastomer (TPC), olefin-based thermoplastic elastomer (TPO), styrene-based thermoplastic elastomer (TPS), urethane-based thermoplastic elastomer (TPU), and thermoplastic rubber crosslinked product ( It may be made of a thermoplastic elastomer containing at least one of TPV), or other thermoplastic elastomers (TPZ).

The buffer portion 13 includes a plurality of second joint position guide grooves 14 that extend in the circumferential direction on the outer peripheral surface and are parallel to each other in the width direction and formed at a position crossing the first joint position guide groove 23; Between mutually adjacent second joint position guide grooves 14 or between the second joint position guide groove 14 located on one edge in the width direction of the plurality of second joint position guide grooves 14 and one end in the width direction, or between a plurality of second joint position guide grooves 14 A plurality of fourth joint position guide grooves 16 extending in the width direction are formed between the second joint position guide groove 14 located at the other edge in the width direction of the joint position guide groove 14 and the other end in the width direction. there is.

The plurality of fourth joint position guide grooves 16 are spaced apart from each other at regular intervals in the circumferential direction of the buffer portion 13 and are formed at positions that alternate with each other in the width direction of the buffer portion 13.

In addition, the fourth joint position guide groove 16 and the third joint position guide groove 25, which are spaced apart from each other in the circumferential direction at the same position in the width direction, are formed at mutually alternating positions with the thermosetting adhesive portion 30 interposed therebetween.

The thermosetting adhesive portion 30 may be formed by melting a thermosetting hot-melt film extending in length to a width corresponding to the outer peripheral surface of the spoke portion 10.

The thermosetting hot-melt film is not limited as long as it is thermoplastic before heat pressing and is thermosetting after heat pressing.

As an example, a thermosetting hot-melt film may be manufactured by coating the reactive hot melt resin published in Republic of Korea No. 10-1915407 onto a release paper.

Alternatively, the thermosetting hot-melt film is composed of 50 to 90% by weight of either hydroxyl-terminated urethane prepolymer or terminal amine-terminated urethane prepolymer with a molecular weight of 5,000 to 200,000 (g/mole), and has a molecular weight of 500 to 200,000 (g/mole). A thermosetting hot melt adhesive composition containing 4.49 to 40% by weight of a reactive blocked polyisocyanate prepolymer of 20,000 (g/mole) and 0.01 to 10% by weight of a chain extender composed of a polyfunctional amine, dissolves urea within 10 to 300 seconds. Those converted to thermosetting by forming crosslinks can be applied.

Alternatively, a thermosetting hot-melt film is made by crystallizing polyether ester elastomer resin (TPEE) at a temperature of 80°C for 3 hours in a hot air drying hopper equipped with an agitator, then removing the residual moisture remaining in the raw material. After drying at 80°C for 8 hours in a dehumidifying drying hopper to remove the resin, the resin is melted using an extruder and then formed to a certain thickness using a T-die. A typical hot melt adhesive film made of elastomeric polyester (TPEE) film can be applied. Polyether ester-based elastomer resin (TPEE) has a melting point of 80°C or more and 160°C or less, and a moisture content of about 200 ppm.

The thermosetting adhesive portion 30 includes a film body portion 31 and first to fourth bonding position guide protrusions 33, 35, 37, and 39.

The film body portion 31 extends in length to a width corresponding to the outer peripheral surface of the spoke portion 10.

The first joining position guide protrusion 33 protrudes on one side of the film body 31 to extend parallel to the longitudinal direction of the film body 31, and has a first wire 32 embedded therein along the longitudinal direction. and is accommodated in the first joining position guide groove (23).

The second joining position guide protrusion 35 protrudes on the other side of the film body 31 to extend parallel to the longitudinal direction of the film body 31, and is positioned at the first joining position with the film body 31 interposed therebetween. It protrudes at a position crossing the guide protrusion 33, and a first wire 32 is embedded inside along the longitudinal direction, and is accommodated in the second joint position difference guide groove 14.

The third joint position guide protrusion 37 extends on one side of the film body 31 in the width direction of the film body 31 and is spaced apart from each other in the longitudinal direction of the film body 31 at regular intervals. They are arranged alternately in the width direction of the main body portion 31. The third joining position guide protrusion (37) is accommodated in the third joining position guide groove (25).

The fourth joining position guide protrusion 39 extends in the width direction of the film body 31 on the other side of the film body 31 and extends at regular intervals in the longitudinal direction of the film body 31, that is, the tread portion ( 20) and the spoke portion 10 are spaced apart from each other in the circumferential direction, and are arranged alternately in the width direction of the film body portion 31. The fourth joining position guide protrusion 39 is accommodated in the fourth joining position guide groove 16.

And, the fourth joining position guide protrusion 39 is arranged to be staggered with the third joining position guide protrusion 37 with the film body part 31 interposed therebetween.

The third joint position guide protrusion 37 and the fourth joint position guide protrusion 39 have a second wire 38 embedded therein. The second wire 38 corresponds to the distance between the adjacent first joint position guide protrusions 33 or the adjacent second joint position guide protrusions 35 or extends briefly.

The thermosetting joint 30 having the above structure may be formed by stacking a plurality of thermosetting hot-melt films vertically. A plurality of first and second wires 32 and 38 may be positioned and embedded between thermosetting hot melt films.

As an example, the thermoset joint 30 can be manufactured in the following manner. The thermosetting joint 30 has a plurality of first wires arranged in the longitudinal direction of the thermosetting hot melt film at regular intervals on one side of the thermosetting hot melt film at the bottom among the three thermosetting hot melt films overlapping vertically, and a plurality of first wires are arranged in the longitudinal direction of the thermosetting hot melt film. After the second wire is arranged to extend in the width direction of the thermosetting hot melt film, the thermosetting hot melt film located at the center covers the bottom thermosetting hot melt film and a plurality of wires.

And, on one side of the thermosetting hot melt film located in the center, other first wires are arranged alternately with the first wires seated on the thermosetting hot melt film at the bottom, and on the second wires seated on the thermosetting hot melt film at the bottom. After arranging a plurality of second wires on one side of the thermosetting hot melt film located at the center to extend lengthwise in the width direction of the thermosetting hot melt film, the top thermosetting hot melt film is connected to the thermosetting hot melt film located at the center and the first and second wires. Cover the wire.

In this way, three thermosetting hot melt films can be bonded to each other by pressing them in an overlapping state with the first and second wires interposed, and an adhesive can be applied between the overlapped hot melt films.

The top thermosetting hot melt film is compressed and wraps around the first and second wires to form first and third joint position guide protrusions (33, 37), and the bottom thermosetting hot melt film is located at the center of the thermosetting hot melt film. Second and fourth joint position guide protrusions 35 and 39 may be formed while surrounding the first and second wires disposed below.

However, the method of forming the first to fourth joint position guide protrusions 33, 35, 37, and 39 by embedding the first and second wires in the thermosetting joint portion 30 is not limited to the presented method.

Meanwhile, differently from what is shown, the thermosetting adhesive portion 30 may be a polyurethane (PU)-based solvent-based adhesive. The polyurethane (PU)-based solvent-based adhesive can be a known polyurethane (PU)-based solvent-based adhesive such as Sikaflex 360hc, or is not limited as long as the heat curing agent is 5wt%. In this case, the polyurethane (PU)-based solvent-based adhesive is applied to the inner peripheral surface of the tread portion 20 and the outer peripheral surface of the spoke portion 10 and is applied to the first to fourth joint position guide grooves 23, 25, 13a, and 13b. can be filled.

As described above, the method of manufacturing a non-pneumatic tire with improved tread and spoke joining process efficiency according to the first embodiment of the present invention includes a spoke part forming step (S1), a tread forming step (S3), and a thermoset forming step. It includes a step of joining the spoke section and the tread section using materials (S5), and a vulcanizing step (S16).

In the spoke portion molding step (S1), the spoke portion 10 is injection molded by supplying the resin material desired to be molded into the ring-shaped first cavity of the spoke portion molding die (not shown).

Although not shown, the spoke molding mold includes a first upper mold and a first lower mold that are joined together to form a first cavity filled with molten material for molding the spoke portion 10. The first upper mold has a plate-shaped first upper base portion and an edge side of the first upper base portion that protrudes and extends in the direction of the first lower mold along the circumferential direction so that a downwardly open ring-shaped first upper molding groove is formed. and may be provided with a first upper side portion having a certain width.

The first lower mold is combined with the first lower base portion corresponding to the first upper base portion and the first upper mold along the edge of the first lower base portion to form a ring-shaped first lower molding groove open upward. It has a first lower side portion that protrudes in a direction and is aligned with the first upper side portion.

The first upper molding groove and the first lower molding groove are joined to each other to form a first cavity. In addition, the spoke portion molding frame includes first and second center core portions each protruding in a cylindrical shape symmetrically in directions facing each other at the center side of the first upper base portion and the first lower base portion, and first and second center core portions. It extends in contact with the first lower base from the first upper base portion at a position spaced apart from the outer peripheral surface of the core portion and the inner peripheral surface of the first upper side portion and the first lower side portion, and mutually extends in the circumferential direction centering on the first and second center core portions. It is provided with a plurality of first to third buffer cavity-forming protrusions spaced apart from each other. A plurality of first to third shock-absorbing holes 15, 17, and 19 are formed in the spoke portion 10 by the first to third shock-absorbing hole forming protrusions.

Alternatively, the spoke portion molding mold may be formed of only one of the first or second center core portions, and the provided first or second center core portion may be extended to contact the facing first upper base portion or first lower base portion. there is. Additionally, the first mold may be formed so that a plurality of first to third buffer hole forming protrusions protrude from the first upper base portion and the first lower base portion, respectively, and face each other.

Meanwhile, the first upper mold and the first lower mold have a structure in which the ring-shaped first upper side and the first lower side are separated in the circumferential direction, respectively, to facilitate mutual separation and extraction of the spoke portion, so that the first or first lower mold is formed by a cylinder. A structure capable of advancing or retreating may be applied to the 2 center core portion.

That is, the first upper side portion may be provided with a plurality of first arc-shaped plates each formed in an arc shape and arranged in the circumferential direction to form a ring shape. In addition, the first lower side portion may be provided with a plurality of second arc-shaped plates each formed in an arc shape and arranged in the circumferential direction to form a ring shape. The first and second arc-shaped plates are each connected to a cylinder and can be applied forward and backward with respect to the first or second center core portion.

Although not shown, the first and second arc-shaped plates may be formed with first groove forming protrusions for forming the second and fourth joining position guide grooves 14 and 16, respectively.

The plurality of first groove forming protrusions are arranged in the circumferential direction and protrude in a shape corresponding to the plurality of second and fourth joint position guide grooves 14 and 16 formed on the outer peripheral surface of the buffer portion 13.

The spoke part 10 formed in the spoke part forming step (S1) is stored in the spoke part molding mold at a temperature of 130 degrees for 30 minutes and then taken out.

In the tread forming step (S3), a thermoplastic elastomer composition (TPE composition) is supplied to the ring-shaped second cavity (not shown) of the tread forming mold (not shown) so that the inner diameter is the same as the outer diameter of the spoke part. Alternatively, a ring-shaped tread portion 20 having a small constant width is injection molded.

The structure of the third molding frame published in Republic of Korea Patent No. 10-2298090 may be applied to the tread portion molding frame.

The tread portion molding frame may include a second upper mold and a second lower mold that are mutually molded.

The second lower mold includes a disc-shaped second lower base portion, a second lower side portion that protrudes upward along the edge of the second lower base portion, and an upward direction from the center side of the second lower base portion to be spaced apart from the second lower side portion. It may be provided with a core portion that protrudes in a cylindrical shape. In the second lower mold, a ring-shaped second lower molding groove is formed between the second lower side portion and the core portion.

The second upper mold includes a disc-shaped second upper base portion and a second upper side portion that protrudes downward from an edge of the second upper base portion and is spaced apart from the core portion. In the second upper mold, a ring-shaped second upper molding groove is formed between the second upper side portion and the upper portion of the core portion that protrudes upward with respect to the second lower side portion. The second upper molding groove and the second lower molding groove are joined to each other to form a second cavity.

Depending on the application shape of the tread 21 of the tread portion 20, the second lower side of the second lower mold and the second tread portion 20 are formed to facilitate extraction of the tread portion 20 molded in the second lower mold and the second upper mold. The upper mold and the second upper side may have a structure capable of advancing and retreating with respect to the core portion.

That is, the second upper side portion may be provided with a plurality of third arc-shaped plates each formed in an arc shape and arranged in the circumferential direction to form a ring shape. In addition, the second lower side portion may be provided with a plurality of fourth arc-shaped plates each formed in an arc shape and arranged in the circumferential direction to form a ring shape. The third and fourth type plates are each connected to the cylinder and can be applied to move forward and backward with respect to the core portion.

Although not shown, second groove forming protrusions for forming the first and third joining position guide grooves 23 and 25 may be formed on the outer peripheral surface of the core portion, respectively.

The second groove forming protrusion may be formed to protrude in a shape corresponding to the plurality of first and third joint position guide grooves 23 and 25 formed on the inner peripheral surface of the tread portion 20 along the circumferential direction.

The tread part 20 formed in the tread part forming step (S3) is stored in the tread part molding mold at a temperature of 180 to 190 degrees for 1 hour and then withdrawn, and the first and third joint position guide grooves 23 and 25 are formed. The formed tread portion 20 can be pulled out from the second lower mold by temporarily expanding its outer diameter.

In the step (S5) of joining the spoke portion and the tread portion using a thermosetting material, a thermosetting joint portion 30 made of a thermosetting material is formed between the ring-shaped tread portion 20 and the spoke portion 10 located within the diameter of the tread portion 20. This is the step of joining the tread portion 20 and the spoke portion 10 by applying or placing and heat pressing.

In the step (S5) of joining the spoke portion and the tread portion using a thermosetting material, the tread portion expansion device 100 shown in FIGS. 4 to 7 is used. Before explaining the step (S5) of joining the spoke portion and the tread portion using a thermosetting material, the tread portion expansion device 100 will be described first.

The tread expansion device 100 includes a base frame 110, a spoke holder 130, a first forward and backward body 141, an expanding support part 150, a pressure part 170, and an adhesion reinforcement part 180. do.

The base frame 110 is formed in a square plate shape.

The spoke holder 130 mounts the spoke portion 10 at a mid-height spaced vertically from the upper surface of the base frame 110 of the first vertical tower 112 extending vertically on one side of the base frame 110. It is installed to extend along a horizontal direction perpendicular to the direction of extension of the first vertical tower 112 so that it can rotate.

The spoke holder 130 is concentrically coupled to the main rotation shaft 132 rotatably installed through the first vertical tower 112, and supports the inner peripheral surface of the spoke portion 10 by a plurality of split support pieces 130a. It can be done. Of course, the divided support pieces 130a of the spoke holder 130 can be constructed to expand or contract radially around the main rotation axis 132.

The spoke holder rotation drive unit is coupled between the driven pulley 138 coupled to the main rotating shaft 132, the driving pulley 136 coupled to the driving shaft of the main motor 135, and the driven pulley 138 and driving pulley 136. It is constructed with a belt 139 that transmits power and is capable of rotating the main rotation shaft 132.

The first forward and backward body 141 is spaced apart from the base frame 110 and has a main rotation axis 132 and

It is installed so that it can be advanced and retreated from the spoke holder 130 along a rail 116 mounted to extend in a parallel direction.

The first advance/retract body 141 has a screw coupling portion (see FIG. 5, 141a) formed at the bottom that is screwed together with the screw 147 so that it can be advanced/retracted by the screw 147, which is rotated forward/reverse by the advance/retract motor 145. It is done. Here, the advance and retreat motor 145 and the screw 147 correspond to the advance and retreat eastern part.

The expanding support portion 150 extends the main rotation axis 132 at a portion opposite to the spoke holder 130 on the first support body 151 in the form of a disk extending vertically from the first advance/retract body 141. A plurality of expansion support pieces 155 capable of supporting the tread portion (see FIG. 5, 20) in an expanded state while advancing and retreating radially on a plane perpendicular to the direction, and an expanding device that controls the advancement and retreat of the expansion support pieces 155. It has a structure with a driving unit 160.

The extended support piece 155 is positioned within the internal accommodation space of the second support body 152, which will be described later.

It is installed to be able to advance and retreat along the guide rod (156) extending in an oblique direction, and is integrally coupled with a nut portion (159) screwed to the advance and retreat shaft (158) extending in a direction parallel to the guide rod (156). . Accordingly, the nut portion 159 and the extended support piece 155 are restrained by the guide rod 156 and advanced and retreated by the forward and reverse rotation of the forward and backward axis 158. Reference numeral 157 denotes a support guide piece extending in a direction parallel to the main rotation axis 132 from the first support body 151 to provide a support area for the forward and backward axis 158 and the guide rod 156.

On the outer upper surface along the radial direction of the extended support piece 155, an adhesion layer 155a made of an elastic material is provided with protrusions to enhance adhesion.

The expanding drive unit 160 includes one end of the expanding shaft 163 and the forward and backward axis 158, which are rotated from the expanding motor 161 mounted on the first support body 151 through the belt 162, which is a power transmission member. The forward and backward axis 158 can be rotated forward and backward by bevel gears 164 provided at the bottom of the machine to engage each other.

The pressing unit 170 is a tread in the area between the extended support pieces 155 on the second support body 152 mounted on the first advance and retreat body 141 to be movable relative to the first support body 151. The pressing piece 172 that presses the portion 20 into close contact with the spoke portion 10 can be advanced and retreated radially. The pressure piece 172 is mounted in the form of a circular pad on the rod of the pressure cylinder 171 mounted on the second support body 152.

The second support body 152 is formed in the shape of an empty disk with an internal accommodation space, and is connected to the first support body 151 by the rod 176 of the first cylinder 175 whose main body is mounted on the first support body 151. It can be moved relative to the first support body 151.

Accordingly, the extension support piece 155 and the pressure piece 172 are arranged to overlap radially, or the expansion support piece 155 and the pressure piece 172 are arranged to non-overlap radially.

The adhesion reinforcement part 180 is mounted on the upper part of the first vertical tower 112 to enable the adhesion reinforcement roller 182 to be adhered to or separated from the outer peripheral surface of the tread part 20 joined to the spoke part 10. Reference numeral 184 is a raising and lowering cylinder that advances and retreats a rod coupled to the support body 186 that supports the joint strengthening roller 182 so that the joint reinforcing roller 182 can be vertically raised and lowered. The joint reinforcement roller 182 can be moved along the direction of the rotation axis.

Although not shown, a control unit (not shown) controls the movable elements including the advance/retract movement unit, expanding support unit 150, pressurization unit 170, and adhesion reinforcement unit 180 in response to the operation signal from the operation unit (not shown). .

The step of joining the spoke portion and the tread portion (S5) using the tread portion expansion device 100 as described above includes a step of fixing the spoke portion (S6), a step of fixing the tread portion diameter expansion (S7), and applying a thermosetting bonding material or It includes a mounting step (S10), a tread moving step (S11), a tread diameter reduction step (S12), and a joining step (S14).

In the spoke part fixing step (S6), the split support pieces 130a of the spoke holder 130 are moved radially to reduce the separation distance based on the main rotation axis 132, the spoke part 10 is mounted, and then divided again. This is a step of mounting the spoke portion to the spoke holder 130 by moving the support pieces 130a so that the radial separation distance is expanded based on the main rotation axis 132.

In the tread portion diameter expansion fixing step (S7), the plurality of expansion support pieces 155 arranged in the circumferential direction of the tread portion expansion device 100 are entered into the inner diameter of the tread portion 20, and then the tread portion 20 is This is a step of moving the plurality of expansion support pieces 155 in the radial direction so that the mutual distance between the plurality of expansion support pieces in the circumferential direction is expanded so that the plurality of expansion support pieces are expanded to have an outer diameter larger than the spoke portion 10.

To perform the tread portion diameter expansion fixing step (S7), the expanding drive unit 160 is controlled so that the tread portion 20 is supported in an expanded state with an expanded outer diameter. That is, the tread portion 20 is initially mounted on the expansion support piece 155 disposed in a position where the tread portion 20 can be accommodated without external force, and then the expansion support piece 155 is moved in the direction in which the outer diameter is expanded. Rotate the expanding motor (161) in the desired direction. The size of the expanded state of the spoke portion 10 can be applied appropriately.

The thermosetting joint material application or placement step (S10) involves applying a polyurethane-based solvent-based adhesive to form a thermosetting joint 30 on the outer peripheral surface of the spoke portion 10 mounted on the spoke holder 130, or placing a thermosetting hot melt film. It's a step.

In the case of a thermosetting hot melt film, both ends may be partially tack-welded to each other with an adhesive or may be partially tack-welded to the outer peripheral surface of the spoke portion 10 to form a ring shape while surrounding the spoke portion 10.

In the tread portion movement step (S11), the first support body 151 and the second support body 152 are moved together while the pressure piece 172 is maintained spaced apart from the outer peripheral surface of the tread portion 20. As shown in FIG. 5, the forward and backward drive unit is controlled to move the spoke holder 130 so that it is placed in the center, so that the spoke part 10 mounted on the spoke holder 130 is supported by the extended support piece 155. This is a step of controlling the tread 20 and the pressure piece 172 to be radially opposed to each other.

First, in the tread portion diameter reduction step (S12), as shown in FIG. 6, the pressure pieces 172 press the tread portion 20 and control the press portion 170 to be in close contact with the spoke portion 10. A secondary fixation step; Controlling the first support body 151 to move relative to the second support body 152 in a direction away from the spoke holder 130 so that the tread portion 20 is separated from the extended support piece 155. an expansion support piece separation step; It includes a pressure piece separation step of controlling the pressure piece 172 to be separated from the tread portion 20 and then moving the second support body 152 in a direction away from the spoke holder 130.

Although not shown, the non-pneumatic manufacturing method according to the present invention controls the adhesion reinforcement unit 180 so that the adhesion reinforcement roller 182 is in close contact with the tread unit 20, and rotates the spoke holder 130 to form the spoke unit. A pressurized adhesion step may be further included to strengthen the adhesion between the (10) and the tread portion (20). In the adhesion strengthening process, the adhesion strengthening roller 182 can be advanced and retreated along the extension direction of the main rotation axis 132.

In the bonding step (S14), heat is applied at 125 to 135 degrees so that the polyurethane-based solvent-based adhesive or thermosetting hot melt film located between the spoke portion 10 and the tread portion 20 is melted, so that the spoke portion and the tread portion are bonded. This is the pressurizing step.

For the joining step (S14), the spoke portion 10 to which the tread portion 20 is attached is moved to a curing chamber (not shown) having an internal space.

The vulcanization chamber is provided with a steam pipe extending along the inner peripheral surface to preheat the internal space or heat the spoke portion 10 to which the tread portion 20 is attached. In addition, the vulcanization chamber further surrounds the spoke portion 10 to which the tread portion 20 is attached in the internal space and includes a pressurization chamber (not shown) that pressurizes the spoke portion 10 to which the tread portion 20 is attached at a set pressure. It is prepared.

In the bonding step (S14), the spoke portion 10 and the tread portion 20 are bonded by applying heat of 5 atmospheres and 125 to 135 degrees to the vulcanization chamber for 10 seconds. It is desirable to heat at a heating temperature of 130 degrees.

The vulcanization step (S16) is a step of applying air pressure to the interconnected tread portion 20 and spoke portion 10 at a high temperature for a certain period of time (e.g., 16 hours) or more after the bonding step (S14).

In the method of manufacturing a non-pneumatic tire (1) with improved tread and spoke joining process efficiency according to the first embodiment of the present invention, the tread portion (20) is formed of thermoplastic elastomer and the tread portion and spoke portion are formed using a thermosetting adhesive material. Since it is bonded, the adhesion between the tread and the spoke can be improved without a buffing process, and the vulcanization time of the spoke can be shortened.

The method of manufacturing a non-pneumatic tire with improved tread and spoke joining process efficiency according to the first embodiment of the present invention includes the first and third parts of the thermosetting joint part 130 in the thermosetting joining material application or mounting step (S10). The joint position guide protrusions (33, 37) are accommodated in the first and third joint position guide grooves (23, 25) so that the thermoset joint portion (30) flows in the circumferential direction and the width direction of the spoke portion (10). The adjustment position of the tread portion 20 can be set in advance so that the second and fourth joint position guide protrusions 35 and 39 are accommodated in the second and fourth joint position guide grooves of the tread portion 20. Manufacturing efficiency can be improved.

In addition, the non-pneumatic tire (2) with improved tread and spoke joining process efficiency according to the first embodiment of the present invention has the first and third joining position guide protrusions (33, 37) of the thermosetting agent joining part (30). It is received in the first and second joint position guide grooves 23 and 25 of the tread portion 20, and the second and fourth joint position guide protrusions 35 and 39 are located in the third and fourth joint position guide grooves 23 and 25 of the tread portion 20. Since it is accommodated in the joint position guide groove, the bonding force between the tread portion and the spoke portion can be improved.

Meanwhile, Figures 11 and 12 show a non-pneumatic tire 3 with improved tread and spoke joining process efficiency according to the second embodiment of the present invention. Components having the same function as in the previously shown drawings are denoted by the same reference numerals.

The non-pneumatic tire (3) with improved tread and spoke joining process efficiency according to the second embodiment of the present invention has a lateral retracting shape of the first to fourth joining position guide grooves (123, 114, 125, and 116), and the first to fourth joining position guide grooves (123, 114, 125, 116). Except for the lateral protruding shape of the joint position guide protrusions 133, 135, 137, and 139, it has the same structure as the non-pneumatic tire 1 according to the first embodiment of the present invention.

The first to fourth joint position guide grooves 123, 114, 125, and 116 include guide parts 123a, 114a, 125a, and 116a whose width becomes narrower in the direction in which the guide parts 123a, 114a, 125a, and 116a are retracted. It communicates with the end of and has a larger width than the end and is provided with separation prevention portions 123b, 114b, 125b, and 116b that protrude on both sides around the end of the guide portion, respectively.

The first to fourth joint position guide protrusions (133, 135, 137, and 139) are in contact with the film body portion 31 so that one side in the direction in which they protrude when melted can be filled with both sides in the width direction of the separation prevention portions (123b, 114b, 125b, and 116b). The width of the other end corresponds to or is greater than the largest width of the guide parts (123a, 114a, 125a, 116a), respectively, and extends from the guide parts (123a, 114a, 125a, 116a) to the separation prevention parts (123b, 114b, 125b, 116b). It protrudes from the film body longer than the retracted depth.

As shown in FIG. 11, a plurality of thermosetting hot melt films covering the first and second wires may be further attached to the thermosetting adhesive portion 130 to form the first to fourth bonding position guide protrusions 133, 135, 137, and 139.

The first to fourth joint position guide protrusions (133, 135, 137, 139) prevent the first to fourth joint position guide grooves (123, 114, 125, 116) from being separated as the thermosetting hot melt film is thermally melted in the bonding step (S14), as shown in FIG. 12. It is filled with parts 123b, 114b, 125b, and 116b.

The non-pneumatic tire (3) with improved tread and spoke joining process efficiency according to the second embodiment of the present invention is the separation prevention portion (123b, 114b, 125b, 116b) of the first to fourth joint position guide grooves (123, 114, 125, 116). ), the ends of the first to fourth joint position guide protrusions 133, 135, 137, and 139 are each restrained, and the thermosetting adhesive unit bonds the tread portion and the spoke portion to each other, so that the mutual bonding strength of the tread portion and the spoke portion can be further improved.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and those skilled in the art will understand that various modifications and equivalent embodiments are possible therefrom. Therefore, the true scope of protection of the present invention should be determined only by the appended claims.

1: Non-pneumatic tire with improved tread and spoke joining process efficiency
10: spoke part 20: tread part
30: thermosetting adhesive part
S1: Spoke part forming step;
S3: Tread forming step;
S5: Spoke and tread joining step using thermosetting material

Claims (5)

delete delete A spoke portion molding step of molding the spoke portion formed of a thermoplastic material;
A tread portion forming step of forming a ring-shaped tread portion made of a thermoplastic material and having a constant width;
A polyurea-based solvent-based adhesive that forms a thermosetting joint made of a thermosetting material is applied between the ring-shaped tread portion and the spoke portion located within the diameter of the tread portion, or a thermosetting hot melt film is placed and then heat-pressed to form a thermosetting joint, thereby forming the tread. It includes a step of joining the spoke portion and the tread portion using a thermosetting material for joining the spoke portion and the spoke portion,
The thermosetting adhesive part
A film body portion extending in length to a width corresponding to the outer peripheral surface of the spoke portion,
A plurality of joining position guide protrusions are provided on one side of the film body to extend in parallel in the longitudinal or width direction of the film body and have wires embedded therein along the longitudinal direction,
The step of joining the spoke part and the tread part is
A spoke part fixing step of mounting the spoke part to the spoke holder of the tread expansion device;
After entering the plurality of expansion support pieces arranged in the circumferential direction of the tread portion expansion device into the inner diameter of the tread portion, the plurality of expansion support pieces are mutually aligned in the circumferential direction so that the tread portion is expanded to have an outer diameter larger than the spoke portion. A tread portion diameter expansion fixing step of moving the plurality of expansion support pieces in a radial direction so that the separation distance is expanded;
A thermosetting joint application or placement step of applying or placing the thermosetting joint on the outer peripheral surface of the spoke portion mounted on the spoke holder;
A tread portion moving step of moving the tread portion so that the tread portion with an expanded inner diameter is positioned around the spoke portion;
After moving a plurality of pressure pieces of the tread portion expansion device arranged in each area between the expansion support pieces radially so that one side of the tread portion in contact with the pressure pieces comes into close contact with the spoke portion, the expansion support pieces are The expansion support pieces are retreated away from the spoke portion in the width direction of the tread portion so as to be separated between the tread portion and the spoke portion, and the pressure pieces are moved radially to be spaced apart from the tread portion and then moved away from the spoke portion. A tread portion diameter reduction step of retracting and fixing the tread portion on the spoke portion;
A bonding step of heat-pressing the polyurethane-based solvent-based adhesive or the thermosetting hot melt film positioned between the spoke portion and the tread portion by applying heat of 125 to 135 degrees so that the spoke portion and the tread portion are bonded to each other.
The spoke holder is
On a first vertical tower extending vertically on one side of the base frame of the tread portion expansion device, the spoke portion can be mounted at a height spaced vertically from the base frame and the first vertical tower can rotate. It is installed to extend along a horizontal direction perpendicular to the direction of extension of,
The tread expansion device is
an advance/retract drive unit that advances/retracts a first advance/retract body installed to advance/retract toward the spoke holder along a rail mounted on the base frame;
A plurality of expansion support pieces capable of supporting the tread portion in an expanded state while radially advancing and retreating from a portion opposite the spoke holder on a first support body extending vertically from the first advancing and retreating body, and the expansion an expanding support unit having an expanding drive unit that controls the advance and retreat of the support piece;
The pressure piece presses the tread portion in close contact with the spoke portion in the area between the extended support pieces on the second support body mounted on the first advance/retract body to be movable relative to the first support body. a pressurizing portion capable of advancing and retreating radially;
It is further provided with an adhesion reinforcement unit mounted on the first vertical tower so as to adhere or separate a joint reinforcement roller from the outer peripheral surface of the tread unit joined to the spoke unit,
The expansion support piece of the expanding support portion is integrally coupled with a nut portion screwed to a forward and backward axis extending in a direction parallel to the guide rod so that it can advance and retreat along a guide rod installed to extend radially on the first support body. It is done,
The expanding driving unit
One end of the expanding shaft rotated through a belt, which is a power transmission member, from an expanding motor mounted on the first support body so that the nut portion and the expansion support piece are restrained by the guide rod and advanced and retreated by the forward and reverse rotation of the forward and backward axis; The forward and backward axis can be rotated forward and backward by bevel gears provided at the lower ends of the forward and backward shafts, respectively,
A method of manufacturing a non-pneumatic tire with improved tread and spoke joining process efficiency, characterized in that an adhesion layer of elastic material is provided on the outer upper surface along the radial direction of the expansion support piece with protrusions to enhance adhesion. delete The method of claim 3, wherein the plurality of joint position guide protrusions
A plurality of first joining position guide protrusions on one side of the film body, extending in parallel in the longitudinal direction of the film body and having wires embedded therein along the longitudinal direction;
A plurality of second joining position guide protrusions protruding from the other side of the film main body to extend in parallel in the longitudinal direction of the film main body and protruding at a position crossing the first joining position guide protrusion with the film main body in between; ,
A plurality of third joint position guide protrusions extending in the width direction of the film body on one side of the film body, spaced apart from each other in the longitudinal direction of the film body at regular intervals, and arranged alternately in the width direction of the film body; ,
On the other side of the film body, it extends in the width direction of the film body, is spaced apart from each other in the longitudinal direction of the film body at regular intervals, is arranged alternately in the width direction of the film body, and the film body is sandwiched between the first and second parts. It is provided with a plurality of fourth joint position guide protrusions arranged alternately with the third joint position guide protrusion,
The spoke portion is formed with second and fourth joint position guide grooves respectively formed to correspond to the second and fourth joint position guide protrusions, and the tread portion is formed to be retracted to correspond to the first and third joint position guide protrusions. A method of manufacturing a non-pneumatic tire with improved jointing process efficiency between the tread portion and the spoke portion, characterized in that first and third joint position guide grooves are formed respectively.

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