Balance weight and manufacturing method thereof

Abstract

To solve the problem that a conventional balance weight has a structure hardly adaptable to the national countermeasures against global warming and its manufacturing cost can be hardly reduced.SOLUTION: In a balance weight 10, a weight part 11 is formed by containing at least metallic powder or a metallic material 11A of a metallic piece, and is sealed inside a casing part 12. By this structure, the metallic material 11A is efficiently used, and the weight part 11 is hardly exposed to an external atmosphere, thereby being formed as at least a plating-less structure or a paint-less structure. As a result, the balance weight 10 becomes a structure corresponding to the national greenhouse gas suppression policy, and the manufacturing cost thereof can be reduced.SELECTED DRAWING: Figure 2A

Description

[Technical Field]

[0001] The present invention relates to a balance weight and a method for manufacturing the same. [Background technology]

[0002] BACKGROUND ART As a conventional balance weight and a manufacturing method thereof, for example, the structure described in Patent Document 1 is known.

[0003] The balance weights are available in standard weights, ranging from 5g to 100g in 5g increments. Each balance weight includes multiple weight bodies of the same shape and weight, and a single piece of double-sided tape attached to one surface of each weight body. The balance weight is then attached to the inner circumferential surface of the wheel requiring balancing using the side of the double-sided tape opposite to the side attached to the weight body.

[0004] Here, one example of a method for manufacturing the weight body of a balance weight is as follows. First, a metal material other than lead is prepared, and the metal material is formed into a single bar-shaped base member by rolling or extrusion. Next, the base member is cut using a cutting tool such as a slitter to form weight bodies of the desired weight. Next, multiple weight bodies are attached to one side of a single double-sided tape so that the tapered surfaces of each weight body face each other.

[0005] When adjusting the balance of a tire wheel, the worker cuts off the required number of weight bodies from the multiple weight bodies attached to a single double-sided tape. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-186748 Summary of the Invention [Problem to be solved by the invention]

[0007] As described above, in conventional balance weight manufacturing methods, a metal material is processed into a single bar-shaped base member and then cut into individual weight bodies. As a result, for example, at the end of the base member, a remnant that cannot be used as a weight body is generated. This remnant is not used as a product, but is discarded or sold at a low price to a metal processing company, which makes it difficult to reduce manufacturing costs.

[0008] Furthermore, the manufacturing process of the base member uses a large amount of electricity purchased from a power company, which makes it difficult to comply with the national greenhouse gas reduction policy.Furthermore, although the metal materials are purchased from steel manufacturers, the manufacturing process of the metal materials emits a large amount of greenhouse gases, including carbon dioxide, which goes against the national global warming countermeasures.

[0009] Furthermore, about one-fifth of the purchased metal materials are discarded or disposed of as described above without being manufactured into balance weights. Furthermore, when iron or copper is used as the metal material, plating or painting is required to prevent rust during use as a balance weight. As a result, plating or painting processes consume a lot of electricity, which, as mentioned above, makes it difficult to comply with the national greenhouse gas reduction policy.

[0010] Furthermore, in the field of vehicles such as motorcycles and automobiles, the development of electric vehicles is being promoted in light of the above-mentioned national environmental measures. However, because these electric vehicles also use tires for travel, tire wheel balance adjustment is necessary from the perspective of improving the safety of electric vehicles during travel. Furthermore, a large number of balance weights are used in the tire wheel balance adjustment.

[0011] Therefore, in order to solve the current balance weight issues mentioned above and advance the country's environmental measures, it is urgent to review the structure of balance weights themselves and the manufacturing method of balance weights. Furthermore, companies that manufacture and sell balance weights, as suppliers to the vehicle industry, will also need to take part in the decarbonization management initiatives being promoted by the government.

[0012] The present invention has been made in consideration of the above circumstances, and aims to provide an environmentally friendly balance weight and a manufacturing method thereof, in which a weight portion formed from metal powder or metal pieces, etc., is sealed within a housing portion, thereby eliminating waste of metal material. [Means for solving the problem]

[0013] The balance weight of the present invention comprises a weight portion formed by mixing at least metal powder or metal pieces with a resin material, a housing portion that houses the weight portion therein, and a sealing member that is attached to the housing portion and closes the opening of the housing portion, wherein the weight portion has at least a plating-less or paint-less structure, and the sealing member has an adhesive layer that attaches the housing portion with the weight portion housed therein to a balance adjustment structure.

[0014] In addition, the balance weight of the present invention is characterized in that the metal powder or metal piece is formed integrally with the resin material, and the weight portion is adhered to the inner surface of the housing portion using an adhesive.

[0015] In the balance weight of the present invention, the housing is a carrier tape.

[0016] In addition, the method for manufacturing a balance weight of the present invention is characterized by comprising the steps of: preparing a carrier tape on which a plurality of housing parts are formed; pouring at least metal powder or metal pieces and a fluid adhesive into the storage space of each housing part of the carrier tape to form a weight part within the storage space; and attaching a sealing member to the carrier tape to seal the weight part within the housing part.

[0017] In addition, the method for manufacturing a balance weight of the present invention is characterized by comprising the steps of: preparing a carrier tape on which a plurality of housing parts are formed; mixing at least metal powder or metal pieces with a resin material to prepare a weight part that fits the storage shape of the housing part; pouring a fluid adhesive into the housing part, and then pouring the weight part into the housing part; and attaching a sealing member to the carrier tape to seal the weight part within the housing part.

[0018] In addition, in the method for manufacturing a balance weight of the present invention, the carrier tape is set by a roll-to-roll method. [Effects of the Invention]

[0019] In the balance weight of the present invention, the weight portion is formed containing at least metal powder or metal pieces and is sealed inside the housing. This structure allows for efficient use of metal materials, and the weight portion is less exposed to the external atmosphere, resulting in at least a non-plated or non-painted structure. As a result, the balance weight conforms to national greenhouse gas reduction policies and reduces manufacturing costs.

[0020] In addition, in the balance weight of the present invention, the metal material contained in the weight portion is formed integrally with the resin material and is bonded and fixed to the inner surface of the housing. This structure prevents the weight portion from breaking through the sealing member and being thrown out of the housing when the balance weight is in use.

[0021] In the balance weight of the present invention, the housing is formed using a carrier tape. With this structure, the outer periphery of the weight is mainly covered by the housing. As a result, even though the balance weight is used in a state exposed to the external environment, the characteristics of the housing make it easy to maintain product quality.

[0022] Furthermore, the balance weight manufacturing method of the present invention uses a carrier tape and forms weight portions on each housing portion of the carrier tape using an in-line method. This manufacturing method eliminates the need for plating or painting the weight portions, resulting in an environmentally friendly structure for the balance weight and reducing manufacturing costs.

[0023] Furthermore, the balance weight manufacturing method of the present invention uses a carrier tape and forms weight portions on each housing portion of the carrier tape using an outline method. This manufacturing method eliminates the need for plating or painting the weight portions, resulting in an environmentally friendly structure for the balance weight and reducing manufacturing costs.

[0024] Furthermore, in the balance weight manufacturing method of the present invention, a carrier tape is used, and the carrier tape is set by the roll-to-roll method, which makes it possible to manufacture balance weights in a fully automated manner. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a perspective view illustrating a balance weight according to an embodiment of the present invention. [Figure 2A] FIG. 1 is a cross-sectional view illustrating a balance weight according to an embodiment of the present invention. [Figure 2B] FIG. 1 is a cross-sectional view illustrating a balance weight according to an embodiment of the present invention. [Figure 3] FIG. 10 is a process flow diagram illustrating a method for manufacturing a balance weight according to another embodiment of the present invention. [Figure 4]FIG. 10 is a process flow diagram illustrating a method for manufacturing a balance weight according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] A balance weight 10 according to one embodiment of the present invention will be described in detail below with reference to the drawings. In describing this embodiment, the same components will generally be designated by the same reference numerals, and repeated explanations will be omitted. Furthermore, the vertical direction of the paper indicates the height direction of the balance weight 10, the left-right direction of the paper indicates the width direction of the balance weight 10, and the front-rear direction of the paper indicates the depth direction of the balance weight 10.

[0027] Fig. 1 is a perspective view illustrating a balance weight 10 of this embodiment. Fig. 2A is a cross-sectional view illustrating the balance weight 10 of this embodiment, taken along line AA in Fig. 1. Fig. 2B is a cross-sectional view illustrating the balance weight 10 of this embodiment, taken along line BB in Fig. 1.

[0028] First, it is known that when the tire wheels mounted on tires of vehicles such as motorcycles and automobiles are out of balance, the higher the rotation speed, the more vibrations due to dynamic imbalance occur. Therefore, for example, when changing from summer tires to winter tires on a vehicle, it is desirable to measure the wheel balance and attach balance weights 10 to the lighter parts of the tire wheel to adjust the wheel balance. The balance adjustment structure of the present invention corresponds to the tire wheel of this embodiment.

[0029] Known examples of the balance weight 10 include a flat metal weight with double-sided tape attached to the backside, and a clip-type weight that fits onto the shaft of a tire wheel. The weights of the balance weight 10 are regulated by standards, ranging from 5 g to 100 g in 5-g increments.

[0030] In recent years, due to the trend toward more sophisticated tire and wheel designs, the balance weight 10 tends to be attached to the inner peripheral surface of the rear side of the tire and wheel rather than to the design surface of the tire and wheel. Furthermore, since the balance weight 10 is mounted on the exterior of the vehicle, it is constantly exposed to the external environment. Therefore, when iron or copper is used for the balance weight 10, a structure is required to ensure product quality, such as rust prevention.

[0031] As shown in FIG. 1, the balance weight 10 mainly comprises a weight portion 11 (see FIG. 2A), a housing portion 12 that houses the weight portion 11 therein, and a sealing member 13 that closes an opening 12A (see FIG. 2A) of the housing portion 12.

[0032] Weight portion 11 is a member for ensuring the weight specified for balance weight 10, and is formed by mixing metal material 11A (see FIG. 2A) and resin material 11B (see FIG. 2A). Metal material 11A may be, for example, a metal powder or metal pieces such as iron, copper, or tungsten. Resin material 11B may be, for example, a polyamide resin, a polyurethane resin, or a synthetic resin obtained by curing an adhesive.

[0033] The standard weight of weight portion 11 is adjusted mainly by the weight of metal material 11A, which is metal powder or metal pieces. Metal powder or metal pieces are contained in resin material 11B and integrated within storage space 12B (see FIG. 2A) of housing portion 12. Weight portion 11 is then molded to fit the shape of storage space 12B of housing portion 12. Note that weight portion 11 may use either metal powder or metal pieces, or both, as metal material 11A.

[0034] Although details will be described later, when weight portion 11 is manufactured by the in-line method, for example, "3000 Gold" manufactured by Cemedine Co., Ltd. is used as resin material 11B. Metal material 11A and resin material 11B are poured into housing space 12B from opening 12A of housing portion 12, and then mixed and pressed by a molding jig (not shown), thereby forming weight portion 11 directly inside housing portion 12.

[0035] On the other hand, when the weight portion 11 is manufactured by the outline method, for example, a polyamide resin or a polyurethane resin is used as the resin material 11B. Then, the weight portion 11 is individually formed by resin molding using a metal mold. Thereafter, the weight portion 11 is fixed inside the housing portion 12 using the above-mentioned adhesive.

[0036] The housing 12 is made of a carrier tape used for transporting semiconductor chips and the like. The carrier tape is made of, for example, PET or PP material, and is heat-resistant up to 100°C and is designed to withstand a salt spray test. The storage spaces 12B of the housing 12 are formed continuously at regular intervals in the extending direction of the carrier tape. The size of the storage spaces 12B of the housing 12 can be arbitrarily changed in design depending on the standard weight of the balance weight 10.

[0037] The sealing member 13 is attached to the top surface 12C of the housing 12 so as to close the opening 12A of the housing 12. For example, a double-sided tape manufactured by 3M Japan Ltd. or a double-sided tape manufactured by Saint-Gobain K.K. is used as the sealing member 13, and release paper is attached to both sides of the adhesive layer in the middle portion. The double-sided tape is wound into a roll, similar to the carrier tape.

[0038] With this structure, the balance weights 10 are formed continuously at regular intervals via the carrier tape. When balancing the tire wheel, the worker cuts off the required number of balance weights 10 from the carrier tape and uses them. The worker then peels off the release paper from the sealing member 13 and uses the adhesive layer of the sealing member 13 to attach the balance weight 10 to the inner circumferential surface of the tire wheel.

[0039] As shown in FIGS. 2A and 2B, the weight portion 11 is disposed within the storage space 12B of the housing portion 12. As described above, the metal material 11A constituting the weight portion 11 is, for example, a metal powder such as iron powder. On the other hand, the resin material 11B constituting the weight portion 11 is, for example, a liquid adhesive such as the above-mentioned "3000 Gold." Note that, for convenience of explanation, the metal powder of the metal material 11A is shown as a black circle in FIGS. 2A and 2B, but the size and amount of the metal powder may differ from the actual structure. In addition, the adhesive is not limited to a liquid adhesive, and may be, for example, a fluid adhesive that can be mixed with the metal material 11A.

[0040] The compounding ratio of metal material 11A and resin material 11B in weight portion 11 can be arbitrarily modified depending on the standard weight of balance weight 10, the size of storage space 12B of housing portion 12, and other factors. By using the aforementioned "3000 Gold" as resin material 11B or as an adhesive, weight portion 11 is adhered to the inner surface 12D of housing portion 12. Not only resin material 11B but also a portion of metal material 11A is exposed on the outer circumferential surface of weight portion 11, and the outer circumferential surface and the inner surface 12D of storage space 12B are fixed together by the adhesive. This structure firmly secures weight portion 11 to housing portion 12.

[0041] Furthermore, the sealing member 13 is attached to the top surface 12C of the housing 12, and the opening 12A above the storage space 12B is closed by the sealing member 13. The top surface of the weight 11 is not covered by the inner surface 12D of the housing 12, but is covered by the sealing member 13. When the sealing member 13 is attached to the carrier tape, nitrogen gas may be sealed in the gap in the storage space 12B to prevent oxidation of the metal material 11A.

[0042] As described above, the balance weight 10 is used while attached to the tire wheel of a vehicle, but the weight portion 11 is fixed to the housing portion 12 and is prevented from moving within the storage space 12B of the housing portion 12 due to the rotation of the tire, etc. With this structure, the weight portion 11 remains fixed to the housing portion 12, and therefore, the weight portion 11 is prevented from breaking through the sealing member 13 and being thrown out of the storage space 12B onto the road surface, etc., while the vehicle is running.

[0043] Furthermore, metal material 11A constituting weight portion 11 is contained in resin material 11B, and weight portion 11 itself is sealed within storage space 12B of housing portion 12 by sealing member 13. This structure makes metal material 11A less susceptible to exposure to the external atmosphere, preventing rust even without plating or painting of weight portion 11. Furthermore, weight portion 11 is formed with at least a plating-less or paint-less structure, thereby maintaining the product quality of balance weight 10. Note that in the inline method described below, weight portion 11 is formed with a plating-less and paint-less structure, but in the outline method, the molded weight portion 11 may be plated or painted according to customer requests.

[0044] Furthermore, in the balance weight 10 of this embodiment, metal powder or metal pieces are used as the metal material 11A that constitutes the weight portion 11. This structure prevents the generation of unused metal material 11A, as occurs in conventional balance weights, and prevents the metal material 11A from being wasted. As a result, the balance weight 10 has a structure that complies with the above-mentioned national greenhouse gas reduction policy, and also reduces manufacturing costs.

[0045] Next, a method for manufacturing a balance weight 10 according to another embodiment of the present invention will be described in detail with reference to the drawings. In describing this embodiment, the same components as those in the balance weight 10 described with reference to Figures 1 to 2B will be designated by the same reference numerals as in the previous embodiment, and repeated description will be omitted.

[0046] Fig. 3 is a process flow diagram illustrating a method for manufacturing the balance weight 10 of this embodiment, showing a manufacturing method in which the weight portion 11 is manufactured by an in-line method. Fig. 4 is a process flow diagram illustrating a manufacturing method for the balance weight 10 of this embodiment, showing a manufacturing method in which the weight portion 11 is manufactured by an outline method.

[0047] As shown in FIG. 3, when the weight portion 11 is manufactured using an inline method, the manufacturing method of the balance weight 10 mainly includes a carrier tape installation process in step S10, a molding process of the weight portion 11 in step S11, an image inspection process of the weight portion 11 in step S12, an attachment process of the sealing member 13 in step S13, a final inspection process of the balance weight 10 in step S14, and a carrier tape recovery process in step S15.

[0048] The carrier tape installation process in step S10 will now be described. First, the roll-to-roll method is adopted in the manufacturing method of the balance weight 10 of this embodiment. As described above, an unused carrier tape is prepared by being wound into a roll.

[0049] In this process, a carrier tape conveying device is used, similar to known semiconductor chip packaging processes. An unused roll of carrier tape is placed at one end of the conveying device, and the small holes in the carrier tape are fitted onto the conveying pins of the conveying device. The conveying device then operates, unwinding the carrier tape from the roll in the direction of travel.

[0050] The molding process of the weight portion 11 in step S11 will now be described. In this process, a metal material feeding device and a resin material feeding device are used, which are arranged along the conveying line of the conveying device. The metal material feeding device is provided with, for example, iron metal powder as the above-mentioned metal material 11A. A known image recognition mechanism of the metal material feeding device performs image recognition of the storage space 12B of the carrier tape traveling along the conveying line.

[0051] Next, a known material feeding mechanism of the metal material feeding device feeds a preset amount of metal powder into the storage space 12B of the carrier tape in accordance with the standard weight of the balance weight 10.

[0052] Next, the resin material supply device is prepared with, for example, the 3000 Gold resin material 11B. Then, a known image recognition mechanism of the resin material supply device image-recognizes the storage space 12B of the carrier tape traveling on the conveying line.

[0053] Next, a known material supply mechanism of the resin material supply device supplies a preset amount of liquid adhesive into the carrier tape storage space 12B in accordance with the standard weight of the balance weight 10.

[0054] The resin material supply device may also include a molding jig. After the adhesive is supplied, the molding jig is inserted into the carrier tape storage space 12B and vibrates while swinging up and down, thereby mixing the metal powder and adhesive supplied to the storage space 12B, stirring and compacting them. As a result, the weight portion 11, which is a mixture of the metal powder and adhesive, is molded in the storage space 12B, and the weight portion 11 is adhered to the inner surface 12D of the carrier tape storage space 12B.

[0055] In this case, the molding jig is made of a material that is difficult to adhere to the adhesive, such as silicone rubber, thereby preventing the adhesive, metal powder, and carrier tape from adhering to the molding jig.

[0056] As described above, the present invention is not limited to the case where the resin material feeding device is disposed downstream of the metal material feeding device on the conveying line. For example, the resin material feeding device, the metal material feeding device, and the resin material feeding device may be disposed in this order from the upstream side of the conveying line.

[0057] In this case, it is possible to sandwich the metal material 11A between the resin materials 11B in the carrier tape storage space 12B, which makes it easier for the metal powder to mix with the adhesive and for the molded weight portion 11 to adhere to the inner surface 12D of the carrier tape storage space 12B.

[0058] The image inspection process for the weight portion 11 in step S12 will now be described. In this process, a known image recognition mechanism is used to determine whether or not a weight portion 11 is formed in each storage space 12B of the carrier tape. If a weight portion 11 is not formed in the storage space 12B, an X or the like is stamped on the back side of the housing portion 12 of that storage space 12B, and the number of housing portions 12 determined to be not formed is counted and stored.

[0059] The process of attaching the sealing member 13 in step S13 will now be described. In this process, for example, double-sided tape manufactured by 3M Japan Co., Ltd. is placed above the conveying lane, and the double-sided tape is attached to the front side of the carrier tape in the direction of travel of the carrier tape. By this operation, the opening 12A above the storage space 12B in each housing portion 12 of the carrier tape is closed with the double-sided tape, thereby sealing the weight portion 11 inside the housing portion 12.

[0060] The final inspection process of the balance weight 10 in step S14 will now be described. In this process, a known image recognition mechanism is used to determine whether each storage space 12B of the carrier tape is completely sealed with the sealing member 13. Furthermore, a known weight measuring device disposed below the conveying line is used to determine whether each housing 12 meets the standard weight of the balance weight 10.

[0061] For any housing 12 that does not meet either the sealing state or the standard weight, an X is stamped on the back side of the housing 12 in the storage space 12B in question, and the number of housings 12 that are determined to be negative is counted and stored. Note that the positions of the housings 12 that are determined to be negative in step S12 are stored, and double stamping or double counting is not performed.

[0062] The carrier tape recovery process of step S15 will now be described. In this process, the carrier tape on which the plurality of balance weights 10 are formed is recovered from the conveying device. As described above, by adopting the roll-to-roll method, the carrier tape that has completed the final inspection process is wound into a roll at the other end of the conveying line and recovered from the conveying line.

[0063] As shown in FIG. 4, when the weight portion 11 is manufactured using the outline method, the manufacturing method of the balance weight 10 mainly includes a molding process of the weight portion 11 in step S20, a carrier tape installation process in step S21, a weight portion 11 insertion process in step S22, an image inspection process of the weight portion 11 in step S23, a sealing member 13 attachment process in step S24, a final inspection process of the balance weight 10 in step S25, and a carrier tape recovery process in step S26.

[0064] In the following explanation, the molding process of the weight portion 11 in step S20 and the inserting process of the weight portion 11 in step S22 will be explained, and the carrier tape installation process in step S21, the image inspection process of the weight portion 11 in step S23, the attaching process of the sealing member 13 in step S24, the final inspection process of the balance weight 10 in step S25, and the carrier tape recovery process in step S26 will be the same as the respective processes of the inline manufacturing method in Figure 3, and their explanations will be omitted here.

[0065] The molding process of the weight portion 11 in step S20 will now be described. In this process, the weight portions 11 are individually formed by resin molding using a mold. For example, a mixture is formed by mixing predetermined amounts of metal material 11A and resin material 11B according to the standard weight of the balance weight 10, and the mixture is injected into each cavity of the mold. In the case of the outline method, for example, a polyamide resin or a polyurethane resin is used as the resin material 11B.

[0066] The shape of the cavity of the mold is formed to fit the carrier tape storage space 12B, and the weight portion 11 after molding with the mold has a shape that fits the carrier tape storage space 12B. As described above, the metal powder etc. of the metal material 11A is mixed in advance with the resin material 11B, and is molded into an integrated state as the weight portion 11.

[0067] The step of feeding the weight portion 11 in step S22 will now be described. In this step, a material feeding device disposed along the conveying line of the conveying device is used. A known image recognition mechanism of the material feeding device performs image recognition of the storage space 12B of the carrier tape traveling along the conveying line. Next, the known material feeding mechanism of the material feeding device feeds the adhesive into the storage space 12B, and then feeds the preformed weight portion 11.

[0068] At this time, the amount of adhesive injected is the amount that will adhere the weight portion 11 to the inner surface 12D of the storage space 12B of the carrier tape, and by pushing the weight portion 11 into the storage space 12B, the weight portion 11 is adhered to the inner surface 12D of the storage space 12B via the adhesive.

[0069] In the manufacturing method of the balance weight 10 of this embodiment, whether the method is an in-line method or an out-line method, the weight portion 11 is adhesively fixed in the storage space 12B of each housing portion 12 of the carrier tape. Then, the opening 12A of the housing portion 12 is closed with the sealing member 13, so that the weight portion 11 is sealed within the housing portion 12.

[0070] This manufacturing method reduces exposure of the weight portion 11 to the external atmosphere, eliminating the need to plate or paint the weight portion 11. As a result, the power consumption during the plating process is reduced, and the balance weight 10 of this embodiment has a structure that complies with the national greenhouse gas reduction policy mentioned above. Furthermore, the use of lead-containing plating solution is reduced, resulting in an environmentally friendly structure for the balance weight 10 and reduced manufacturing costs.

[0071] In this embodiment, the double-sided tape is used as the sealing member 13, and the sealing member 13 is directly attached to the surface of the carrier tape. However, the present invention is not limited to this. For example, a non-adhesive protective tape may be sandwiched between the sealing member 13 and the carrier tape. In this case, the protective tape is attached to the surface of the carrier tape using the adhesive. Furthermore, the weight portion 11 does not adhere to the adhesive layer of the sealing member 13, thereby improving recyclability. In addition, various modifications are possible within the scope of the present invention. [Explanation of symbols]

[0072] 10 balance weight 11 Weight section 11A Metal material 11B Resin material 12 Housing 12A opening 12B Storage space 12C Top 12D inner surface 13 Sealing member

Claims

1. a weight portion formed by mixing at least metal powder or metal pieces and a resin material; a housing portion that houses the weight portion therein; a sealing member attached to the housing portion and closing an opening of the housing portion, the weight portion has at least a non-plating or non-painting structure, The balance weight is characterized in that an adhesive layer is formed on the sealing member to attach the housing portion with the weight portion housed therein to a balance adjustment structure.

2. the metal powder or the metal pieces are integrally formed with the resin material, 2. The balance weight according to claim 1, wherein the weight portion is adhered to the inner surface of the housing portion using an adhesive.

3. 3. The balance weight according to claim 2, wherein the housing is a carrier tape.

4. preparing a carrier tape on which a plurality of housing portions are formed; a step of pouring at least metal powder or metal pieces and a fluid adhesive into a storage space of each of the housing portions of the carrier tape to form a weight portion in the storage space; and attaching a sealing member to the carrier tape to seal the weight portion within the housing portion.

5. preparing a carrier tape on which a plurality of housing portions are formed; a step of preparing a weight portion that fits the housing shape by mixing at least metal powder or metal pieces with a resin material; a step of injecting a fluid adhesive into the housing portion, and then injecting the weight portion into the housing portion; and attaching a sealing member to the carrier tape to seal the weight portion within the housing portion.

6. 6. The method for manufacturing a balance weight according to claim 4, wherein the carrier tape is set by a roll-to-roll method.

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