KR102591437B1 - 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, the outer peripheral surface of the spoke and one side of the tread are first 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 subject to time constraints that require rapid joining, and a manufacturing method thereof.

The non-pneumatic tire with improved tread and spoke bonding 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, an inner peripheral surface joined to the outer peripheral surface of the spoke portion, and an outer peripheral surface in contact with the ground. It is characterized by having a tread portion formed of a thermoplastic material, and a thermosetting joint portion located between the spoke portion and the tread portion and thermosetting at 125 to 135 degrees to join the spoke portion and the tread portion.

The tread portion is formed of a thermoplastic elastomer material, and the thermosetting joint portion is formed by heat curing a thermosetting hot melt film extending in length to a width corresponding to the outer circumferential surface of the spoke portion, or by heat curing a polyurethane-based solvent-based adhesive that can be applied to the outer peripheral surface of the spoke portion. It is preferable that it is formed by curing.

The thermosetting joint portion is formed by thermally curing the thermosetting hot melt film, and the thermosetting hot melt film includes a film body portion extending in length to a width corresponding to the outer peripheral surface of the spoke portion, and protruding from one side and the other side of the film body portion, respectively. The film body portion extends in the width direction or the longitudinal direction and is provided with a plurality of first and second joint position guide protrusions into which wires are embedded along the longitudinal direction, and the spoke portion and the tread portion are connected to the first or second joint portion. It is preferable that first and second joining position guide grooves are respectively formed to correspond to the joining position guide protrusions, and that the first and second joining position guide protrusions are formed at positions crossing each other.

In addition, 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 the spoke portion; A tread portion forming step of forming a ring-shaped tread portion with a constant width; A spoke portion and a tread using a thermosetting material in which a thermosetting joint made of a thermosetting material is applied or placed between the ring-shaped tread portion and the spoke portion located within the diameter of the tread portion and heat-pressed to join the tread portion and the spoke portion. It is characterized in that it includes a secondary bonding step.

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 a 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 A tread portion diameter reduction step of fixing the tread portion on the spoke portion by retreating the expansion support pieces away from the spoke portion in the width direction of the tread portion so as to separate the tread portion from the spoke portion; It is preferable to include a bonding step of applying heat of 125 to 135 degrees so that the thermosetting joint located between the spoke portion and the tread portion is heat-melted and heat pressing the spoke portion and the tread portion to be bonded.

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.

Figure 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 block diagram of the spoke part and tread part joining step of the non-pneumatic tire manufacturing method of Figure 1,
Figure 3 is a partially separated perspective view of a non-pneumatic tire manufactured through 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 2;
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 an exploded perspective view of a non-pneumatic tire according to a second embodiment of the present invention;
Figure 8 is a partial cross-sectional view of a non-pneumatic tire according to a third embodiment of the present invention;
Figure 9 is a perspective view of the thermosetting film of the non-pneumatic tire of Figure 8.

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 6 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 joining 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 joint that is located between the tread portion 20 in contact with the ground and the spoke portion 10 and the tread portion 20 and is 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 spoke portion 10 is formed in a ring shape and has a wheel coupling portion 11 on which the 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 thermosetting joint 30 may be formed using a polyurethane (PU)-based solvent-based adhesive or a thermosetting hot-melt film.

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%.

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 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.

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 vulcanization 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).

The spoke portion 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 forming 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 first mold 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 around 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 first mold may be formed with 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 cylinder that allows the first upper mold and the first lower mold to advance and retreat with respect to the first or second center core portions 105 and 115, so as to facilitate separation from each other and extraction of the spoke portion. Structure may also be applied.

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 10 having a small constant width is injection molded.

The structure of the third molding frame published in Republic of Korea Patent No. 10-2298090 filed by the applicant of the present invention 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 disk-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 disk-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 second 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.

The tread portion 20 formed in the tread portion forming step (S3) is accommodated in a tread portion molding mold at a temperature of 180 to 190 degrees for 1 hour and then taken out.

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 6 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 pressing part 170, and an adhesion reinforcement part 180. do.

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

The spoke holder 130 is capable of mounting the spokes 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 be rotated.

The spoke holder 130 is concentrically coupled to the main rotation shaft 132 rotatably installed through the first vertical tower 112 to support the inner peripheral surface of the spoke 10 by a plurality of split support pieces 130a. It is possible. Of course, the split 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 forward/backward motor 145 and screw 147 correspond to the eastern forward/backward drive section.

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

The extended support piece 155 is positioned within the internal accommodation space of the second support body 151, which will be described later.

It is installed to be able to advance and retreat along the guide rod (156) extending in a direction, and is integrally coupled with the nut portion (159) screwed to the advance and retreat axis (158) extending in a direction parallel to the guide rod (156). there is. 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 to engage each other at the bottom of the .

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, which presses (20) into close contact with the spoke (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 a disk with an empty center and has an internal receiving space, and is formed 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 unit 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 20 joined to the spoke 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 rotation axis direction.

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 20 is initially mounted on the expansion support piece 155 disposed in a position where the tread 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). The size of the expanded state of the spoke 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 spoke together while the pressure piece 172 is maintained spaced apart from the outer peripheral surface of the tread 20. As shown in FIG. 5, the forward and backward drive unit is controlled to move the holder 130 so that it is placed in the center, and the tread supported on the extended support piece 155 is attached to the spoke 10 mounted on the spoke holder 130. This is a step of controlling the positioning of (20) and the pressure piece 172 to face each other radially.

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 come into close contact with the spokes 10. a fixing 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 heat melted to bond the spoke portion and the tread portion. This is the pressurizing step.

For the joining step (S14), the spoke portion 20 to which the tread portion 10 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 circumferential surface to preheat the internal space or heat the spoke portion 20 to which the tread portion 10 is attached. In addition, the vulcanization chamber further surrounds the spoke portion 20 to which the tread portion 10 is attached in the internal space and includes a pressurizing chamber (not shown) that pressurizes the spoke portion 20 to which the tread portion 10 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 vulcanizing step (S16) is a step of applying air pressure to the interconnected tread portion 10 and spoke portion 20 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 (10) 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.

Meanwhile, Figure 7 shows a non-pneumatic tire 2 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 (2) with improved tread and spoke joining process efficiency according to the second embodiment of the present invention has a tread portion ( 120) and; A spoke portion (110) that is inserted into the outer circumferential surface at regular intervals in the circumferential direction and has a second joint position guide groove (117) formed at a position crossing the first joint position guide groove (127); It is formed by melting a thermosetting hot melt film extending in length to a width corresponding to the outer circumference of the spoke portion 110, and includes a film body portion 131 extending in length to a width corresponding to the outer circumference of the spoke portion 110, and a film body portion. First and second joining position guide protrusions (133, 135) protrude on one side and the other side of (131), but protrude in a length shorter than the width of the film body portion (131), and have wires (137) embedded therein along the longitudinal direction. It is provided with a formed thermoset joint (130).

The first joint position guide protrusion 133 and the second joint position guide protrusion 135 are embedded in positions that cross each other. The plurality of wires 137 may be divided into a first wire embedded in the first joint position guide protrusion 133 and a second wire embedded in the second joint position guide protrusion 135.

The thermosetting agent joint 130 may be formed by applying a plurality of thermosetting hot-melt films stacked vertically. Multiple wires 137 may be positioned and embedded between thermosetting hot melt films.

As an example, the thermoset joint 130 may be manufactured in the following manner. The thermosetting joint 130 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 that overlap vertically, and is located at the center. The positioned thermosetting hot melt film covers the bottom thermosetting hot melt film and a number of wires. In addition, the second wires are arranged alternately with the first wires seated on one side of the thermosetting hot melt film located at the center, and the top thermosetting hot melt film covers the thermosetting hot melt film located at the center and the second 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 second wire to form a first joining position guide protrusion 133, and the bottom thermosetting hot melt film wraps around the first wire to form a second joining position guide protrusion 135. can be formed.

However, the method of forming the first and second joint position guide protrusions 133 and 135 by embedding a wire in the thermoset joint 130 is not limited to the presented method.

The method of manufacturing a non-pneumatic tire with improved tread and spoke joining process efficiency according to the second embodiment of the present invention includes the second joining position guide of the thermosetting agent joint 130 in the thermosetting joining material application or mounting step (S10). The protrusion 135 is accommodated in the first joint position guide groove to prevent the thermoset joint 130 from flowing in the circumferential and width directions of the spoke portion 10, and the first joint position guide protrusion 133 is Manufacturing efficiency can be improved because the adjustment position of the tread portion 120 can be set in advance to be accommodated in the second joint position guide groove of the tread portion 120.

In addition, in the non-pneumatic tire (2) with improved tread and spoke joining process efficiency according to the second embodiment of the present invention, the first joining position guide protrusion 133 of the thermosetting agent joining part 130 is connected to the tread part 110. Since the first joint position guide groove 127 is accommodated, and the second joint position guide protrusion 135 is accommodated in the second joint position guide groove 117, the coupling force between the tread portion and the spoke portion can be improved.

Meanwhile, Figures 8 and 9 show a non-pneumatic tire 3 with improved tread and spoke joining process efficiency according to a third 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 third embodiment of the present invention is

A tread portion 220 having first joint position guide grooves 227 formed on the inner peripheral surface at regular intervals in the width direction; A spoke portion (210) that is inserted into the outer peripheral surface at regular intervals in the width direction and has a second joint position guide groove (217) formed at a position crossing the first joint position guide groove (227); It is formed by melting a thermosetting hot melt film extending in length to a width corresponding to the outer circumference of the spoke portion 210, and includes a film body portion 231 extending in length to a width corresponding to the outer circumference of the spoke portion 210, and a film body portion. First and second joint position guide protrusions (233,235) protrude on one side and the other side of (231), but protrude to a length shorter than the length of the film body portion (231), and have a wire (237) embedded therein along the longitudinal direction. It is provided with a formed thermoset joint (230).

A plurality of first bonding position guide protrusions 233 are arranged in the width direction of the film body portion 231. The second bonding position guide protrusions 235 are arranged alternately with the first bonding position guide protrusions 233 in the width direction of the film body portion 231.

The plurality of wires 237 may be divided into a first wire embedded in the first joint position guide protrusion 233 and a second wire embedded in the second joint position guide protrusion 235.

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 joint
S1: Spoke part forming step;
S3: Tread forming step;
S5: Spoke and tread joining step using thermosetting material

Claims (6)

A spoke portion formed of a thermoplastic material 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 joint is located between the spoke portion and the tread portion and is heat-cured at 125 to 135 degrees to join the spoke portion and the tread portion,
The tread portion is formed of a thermoplastic elastomer material,
The thermosetting joint is
A thermosetting hot melt film extending in length corresponding to the outer peripheral surface of the spoke portion is formed by heat curing,
The thermosetting hot melt film is
A film body portion extending in length to a width corresponding to the outer peripheral surface of the spoke portion,
A plurality of first and second joint position guide protrusions are provided on one side and the other side of the film body, respectively, extending in the width or length direction of the film body, and having wires embedded therein along the length direction;
The spoke portion and the tread portion are each formed with first and second joint position guide grooves formed to correspond to the first or second joint position guide protrusions,
A non-pneumatic tire with improved joining process efficiency between the tread portion and the spoke portion, characterized in that the first and second joint position guide protrusions are formed at positions crossing each other. 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 polyurethane-based solvent-based adhesive forming 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 the tread portion. And a step of joining the spoke portion and the tread portion using a thermosetting material for joining the spoke portion,
The step of joining the spoke part and the tread part is
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 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 thermosetting joint is
It is formed by melting a thermosetting hot melt film extending in length to a width corresponding to the outer peripheral surface of the spoke portion, and a film body portion extending in length to a width corresponding to the outer peripheral surface of the spoke portion, and protruding on one side and the other side of the film body portion, respectively. extending in the width direction or length direction of the film main body and having a plurality of first and second joint position guide protrusions into which wires are embedded along the longitudinal direction,
The spoke portion and the tread portion are each formed with first and second joint position guide grooves formed to correspond to the first or second joint position guide protrusions,
A method of manufacturing a non-pneumatic tire with improved joining process efficiency between a tread portion and a spoke portion, characterized in that the first and second joint position guide protrusions are formed at positions crossing each other. delete delete

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