WO2015041187A1 - Codeur magnétique et son procédé de production - Google Patents

Codeur magnétique et son procédé de production Download PDF

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Publication number
WO2015041187A1
WO2015041187A1 PCT/JP2014/074320 JP2014074320W WO2015041187A1 WO 2015041187 A1 WO2015041187 A1 WO 2015041187A1 JP 2014074320 W JP2014074320 W JP 2014074320W WO 2015041187 A1 WO2015041187 A1 WO 2015041187A1
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WO
WIPO (PCT)
Prior art keywords
adhesive
magnetic encoder
manufacturing
magnetic
plastic magnet
Prior art date
Application number
PCT/JP2014/074320
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English (en)
Japanese (ja)
Inventor
村上　豪
矢部　俊一
内山　貴彦
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日本精工株式会社
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Publication date
Application filed by 日本精工株式会社 filed Critical 日本精工株式会社
Priority to CN201480051554.2A priority Critical patent/CN105556249A/zh
Publication of WO2015041187A1 publication Critical patent/WO2015041187A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/24428—Error prevention
    • G01D5/24433—Error prevention by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14311—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles

Definitions

  • the present invention relates to a method for manufacturing a magnetic encoder used for detecting the rotational speed of a rotating body, and to a magnetic encoder manufactured by the method.
  • magnetic encoders used for wheel bearings include rubber magnet encoders that use magnetic rubber mixed with rubber and plastic magnet encoders that consist of plastic magnets mixed with plastic.
  • plastic magnet is easy to injection mold (magnetic field molding) in a state where a magnetic field is applied, which makes it possible to achieve higher output than when using a rubber magnet with the same amount of magnetic powder.
  • plastic magnet encoders have environmental reliability (heat oxidation resistance, water resistance, oil resistance, chemical resistance, etc.) and wear resistance. However, it is known to be superior to rubber magnet encoders.
  • the plastic magnet encoder is more suitable than the rubber magnet encoder for the requirements based on the assumption that it is used in a harsh environment assuming a higher output (high magnetic force) and BRICS.
  • the market for plastic magnet encoders is expected to expand more and more based on the above requirements.
  • Patent Documents 1 and 2 it is possible to obtain a plastic magnet encoder with highly reliable adhesion that can be applied even in harsh environments.
  • inject high-temperature, high-pressure plastic magnet material into the mold controlled to the desired temperature, and hold it as it is for a certain period of time after the injection is completed
  • this is a manufacturing method in which an adhesive reaction between a certain amount of the plastic magnet and the adhesive proceeds in the mold. Therefore, in order to advance the adhesion reaction in the mold, the process includes a process of holding the insert molded body in the mold for a certain period of time, so that there is a limit in shortening the tact time.
  • the present invention maintains a good adhesion state between the fixing member and the plastic magnet to ensure high reliability, shortens the tact time, increases the production efficiency, and reduces the production cost. It aims to plan.
  • the present invention solves the above-described problems, and provides the following first and second manufacturing methods and a magnetic encoder.
  • a method of manufacturing a magnetic encoder for detecting the rotational speed of a rotating body wherein a plastic magnet material containing a resin and magnetic powder is insert-molded using a fixing member coated with an adhesive in advance as a core.
  • the adhesive is an adhesive whose coating state can be controlled by heat treatment, and is applied in a cured state or a solidified state that does not flow away from the fixing member by a melt of the plastic magnet material during insert molding.
  • a first manufacturing method characterized in that, after completion of insert molding, the molded product is taken out of the mold together with the slinger.
  • the adhesive is an adhesive capable of controlling the state of the coating film by heat treatment, and after completion of injection molding, the heat treatment is completed to complete the adhesion, and the adhesive bonding between the magnet portion and the fixing member is performed. 2nd manufacturing method characterized by complete
  • the first and second manufacturing methods according to the present invention use an insert molding method using an adhesive capable of controlling the state of the coating film by heat treatment. Since the tact time can be greatly shortened while ensuring the reliability, drastic cost reduction can be realized. Therefore, the magnetic encoder obtained by this method is also highly reliable and inexpensive.
  • FIG. 1 is a cross-sectional view showing a state of being incorporated in a wheel support rolling bearing unit 2a for supporting a non-driven wheel, which is supported by an independent suspension, as an example of a magnetic encoder.
  • an outer ring 5a that is a fixed ring
  • a hub 7a and an inner ring 16a that are rotating wheels (rotating bodies) that rotate integrally with a mounting flange 12 for fixing a wheel (not shown)
  • Balls 17a and 17a which are a plurality of rolling elements, are arranged between the outer ring 5a and the hub 7a and the inner ring 16 so as to be freely rollable in the circumferential direction
  • a magnetic encoder 26 is included.
  • the inner ring 16a that is externally fitted to the small-diameter step portion 15 formed at the inner end portion of the hub 7a is restrained by a caulking portion 23 that is formed by caulking the inner end portion of the hub 7a radially outward. By attaching, it is fixedly coupled to the hub 7a. Further, the wheel is formed by a stud 8 planted at a predetermined interval in the circumferential direction on a mounting flange 12 formed at a portion protruding from the outer end portion of the outer ring 5a which is a fixed wheel at the outer end portion of the hub 7a. It can be connected and fixed freely.
  • the outer ring 5a can be coupled and fixed to a knuckle or the like (not shown) constituting a suspension device by a coupling flange 11 formed on the outer peripheral surface thereof.
  • a plurality of balls 17a and 17a guided by the cage 18 are arranged so as to be rotatable in the circumferential direction.
  • seal rings 21a and 21b are provided between the inner peripheral surfaces of both ends of the outer ring 5a, the intermediate outer peripheral surface of the hub 7a, and the inner end peripheral surface of the inner ring 16a, respectively. These seal rings 21a and 21b block the space provided with the balls 17a and 17a from the outer space between the inner peripheral surface of the outer ring 5a and the outer peripheral surfaces of the hub 7a and the inner ring 16a.
  • Each of the seal rings 21a and 21b is formed by bending a mild steel plate and reinforcing the elastic members 22a and 22b with cored bars 24a and 24b having an L-shaped cross section and an annular shape as a whole.
  • Each of such seal rings 21a and 21b has a metal core 24a and 24b fitted into both ends of the outer ring 5a by an interference fit, and the tip ends of the seal lips formed by the respective elastic members 22a and 22b are connected to the hub.
  • the slinger 25 is externally fitted and fixed to the outer peripheral surface of the intermediate portion 7a or the outer peripheral surface of the inner end portion of the inner ring 16a.
  • the magnetic encoder 26 includes a slinger 25 that is a fixed member and a magnetic pole forming ring 27 that is a magnet portion integrally joined to the side surface of the slinger 25.
  • the magnetic pole forming ring 27 is a multipolar magnet, and N and S poles are alternately formed in the circumferential direction.
  • a magnetic sensor 28 is disposed facing the magnetic pole forming ring 27 (see FIG. 1).
  • the magnetic pole forming ring 27 of the magnetic encoder 26 is composed of a multipolar plastic magnet made of magnetic powder and a resin composition serving as a binder thereof. Then, as will be described later, the magnetic encoder 26 uses a slinger 25 pre-applied with an adhesive as a core, insert-molds a plastic magnet material, and then performs heat treatment to bond the adhesive and the plastic magnet. After the reaction is progressed and the adhesion between the two is completed, the resultant bonded joined body is produced by multipolar magnetization in the circumferential direction.
  • a plastic magnet consists of a resin composition which has magnetic powder and a binder as a main component.
  • a binder As the main component of the binder, polyamide-based resin, specifically, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 612, or the like can be used.
  • polyamide-based resin specifically, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 612, or the like.
  • polyamide-based resins so-called High Nylon polyamide 11, polyamide 12, polyamide 612, and further, polyamide 410, polyamide 6T which is a semi-aromatic polyamide obtained by partially copolymerizing terephthalic acid with an adipic acid unit.
  • polyamide 6T / 6I Polyamide 6T / 6I / 6-6
  • Polyamide 6T / M-5T Polyamide 9T, etc.
  • their water absorption is relatively small, so that the snow melting resistance is Since it becomes favorable, it is especially preferable.
  • ferrite such as strontium ferrite or barium ferrite
  • rare earth magnetic powder such as neodymium-iron-boron, samarium-cobalt, samarium-iron
  • electro nickel plating electroless nickel plating
  • a surface treatment layer such as an epoxy resin coating, a silicon resin coating, or a fluororesin coating may be provided on the encoder surface.
  • ferrite such as strontium ferrite is most suitable in consideration of weather resistance. Further, in order to improve the magnetic properties of the ferrite, lanthanum and cobalt are mixed, or a part of the ferrite is neodymium- It may be replaced with rare earth magnetic powder such as iron-boron, samarium-cobalt, samarium-iron.
  • the content of magnetic powder in the plastic magnet is preferably 40 to 80% by volume. If the content of magnetic powder is less than 40% by volume, the magnetic properties are inferior and it becomes difficult to carry out multipolar magnetization in the circumferential direction at a fine pitch. On the other hand, if the content exceeds 80% by volume, the amount of resin binder As a result, the strength of the entire magnet is lowered, and at the same time, molding becomes difficult and practicality is lowered.
  • the polyamide resin which is the main component of the binder
  • the polyamide-based resin that is the main component of the binder is not generally regarded as a brittle material that is inferior in toughness.
  • the flexibility (toughness) inherent to the base resin is not always sufficient.
  • the blending of the soft component as an impact strength improver in (1) is extremely important.
  • thermoplastic elastomer containing a soft segment having a glass transition temperature of at least ⁇ 40 ° C. or less in its molecular structure
  • Available thermoplastic elastomers include polystyrene-based, polyolefin-based, vinyl chloride-based, polyester-based, polyurethane-based, polyamide-based, polyolefin-based and silicone-based, but more suitable in consideration of encoder performance requirements and usage environment.
  • engineering plastic thermoplastic elastomers such as polyester and polyamide, and the soft segment of these thermoplastic elastomers only needs to have a glass transition temperature of ⁇ 40 ° C. or lower.
  • the soft segment is not particularly limited as long as it has a glass transition temperature of ⁇ 40 ° C. or lower and other properties.
  • polyester, polyether, polybutadiene, polyisoprene, polycarbonate, polycaprolactam, and the like are considered, and there are many choices.
  • thermoplastic elastomer having polyester or polyether in the soft segment it would be optimal to select a thermoplastic elastomer having polyester or polyether in the soft segment.
  • the latter containing the polyether segment can be considered more suitable.
  • Specific examples of the polyether segment include polytetramethylene oxide, polypropylene oxide, polyethylene oxide, and copolymers thereof.
  • a dynamic cross-linking thermoplastic elastomer may be used as the soft component.
  • the dynamically cross-linked thermoplastic elastomer is a polymer alloy composed of a thermoplastic resin and rubber, and has the feature of improving oil resistance and heat resistance, which are disadvantages of conventional thermoplastic elastomers. Since the dynamic cross-linking thermoplastic elastomer can be designed by arbitrarily combining a thermoplastic resin and rubber, various combinations are being studied. In other words, polyolefin-based, styrene-based, polyamide-based, etc. are on the market.
  • Hyperalloy Actimer manufactured by Riken Technos Co., Ltd. which compatibilizes styrene-based dynamically cross-linked elastomer, polyester elastomer, polyurethane elastomer, and polyamide elastomer.
  • a dynamically crosslinked thermoplastic elastomer made of polyamide resin and silicon rubber marketed by Multibase, Inc. can be used particularly suitably.
  • the blending amount of the soft component is 5 to 50% by mass, preferably 10 to 35% by mass with respect to the total amount of the resin composition. If it is less than 5% by mass, the absolute amount is too small to give the desired low-temperature flexibility. On the other hand, if it exceeds 50% by mass, the heat resistance is particularly insufficient, and it is not suitable for use as a magnet material for a magnetic encoder.
  • a heat stabilizer heat-resistant processing stabilizer, antioxidant
  • a light stabilizer an antistatic material
  • a plasticizer an inorganic or organic flame retardant, a reinforcing material, and the like
  • an inorganic or organic flame retardant a reinforcing material, and the like
  • a heat stabilizer in consideration of the use environment, the addition of a heat stabilizer is preferable, and examples of suitable additions include 2,2,4-trimethyl-1,2-dihydroquinoline polymers as amine-based antioxidants.
  • amine-based antioxidants Such as amine / ketone, diallylamine represented by p, p'-dicumyldiphenylamine, and p-phenylenediamine represented by N, N'-diphenyl-p-phenylenediamine.
  • As antioxidants monophenols typified by 2,6-di-t-butyl-4-methylphenol and typified by 2,2'-methylenebis (4-methyl-6-t-butylphenol) There is a polyphenol type.
  • a hydroquinone type such as 2,5-di-t-butylhydroquinone can also be used.
  • a peroxide-decomposing antioxidant may be used in combination with the amine-based, phenol-based and hydroquinone-based antioxidants in the resin composition.
  • a sulfur secondary antioxidant such as 2-mercaptobenzimidazole or a phosphorus secondary antioxidant such as tris (nonylated phenyl) phosphite can be used.
  • the blending amount of the heat stabilizer is preferably about 0.1 to 3% by mass with respect to the binder resin, but depending on the type, the amount is more than that which does not bloom or adversely affects the physical properties of the resin. May be used.
  • a magnetic powder-containing resin composition containing the above components is pelletized to obtain a plastic magnet material used for insert molding.
  • a biaxial extruder, a kneader, a Banbury mixer, or the like a binder resin, a soft component, and various additives are kneaded to obtain a resin composition, and the resin composition is extruded and pelletized.
  • the kneading is suitably performed at a temperature of 160 ° C. to 280 ° C. for 1 minute to 20 minutes.
  • the resin composition pellets and the magnetic powder are kneaded and then extruded to pelletize the magnetic powder-containing resin composition.
  • the kneading at this time is also suitably performed at a temperature of 160 ° C. to 280 ° C. for 1 minute to 20 minutes.
  • Patent Documents 1 and 2 can provide a highly reliable plastic magnet encoder that is excellent in performance and durability and can be applied even under severe vehicle undercarriage environments.
  • the fixing member (slinger 25) previously coated with an adhesive is set in the mold, injection molding of the plastic magnet material is performed, and after completion of the injection, the mold is held for a certain period of time, and in the mold to some extent Since the adhesion reaction between the plastic magnet and the adhesive proceeds, there is a limit to shortening the tact time.
  • the present invention has been completed by clarifying the relationship between the processing conditions of the adhesive and the change in the state of the coating film that enable control of the state).
  • adheresion is completed means that the magnetic encoder has achieved the adhesion strength and adhesion durability of the magnetic pole forming ring 27 so as to ensure sufficient reliability in an actual use environment.
  • an adhesive capable of controlling the coating state by heat treatment is used. More specifically, the state of the coating after coating is set to a level that does not flow depending on the heat treatment conditions (temperature, time), even in the desired state, that is, molten plastic magnet material injected at high temperature and high pressure during insert molding.
  • An adhesive (second manufacturing method) that has a state (first manufacturing method) or that completes bonding during the heat treatment after molding and becomes a cured or solidified state is used.
  • thermosetting adhesive there is no other limitation as long as the above selection conditions are satisfied, but a thermosetting adhesive and a hot melt adhesive can be preferably used.
  • a thermosetting adhesive an epoxy resin adhesive, a silicone adhesive, and a polyurethane resin adhesive can be used.
  • the thermosetting adhesive also includes a room temperature curable epoxy resin adhesive, a silicone adhesive, and a polyurethane resin adhesive that are cured at room temperature, and these can also be used suitably.
  • Hot melt adhesives include polyurethane hot melt adhesives, polyamide hot melt adhesives, polyester hot melt adhesives, modified olefin hot melt adhesives, silicone hot melt adhesives, and epoxy hot melt adhesives. Agents, phenol resin-based hot melt adhesives, and the like. These may be used after being appropriately modified, for example, modified to impart thermosetting properties.
  • the hot melt adhesive Since the hot melt adhesive is heated and applied in a molten state and then left at room temperature, the coating surface is solidified to form a coating film, so that it does not flow out of the slinger 25 during insert molding. And by heating again, hardening reaction advances and it hardens
  • thermosetting epoxy resin adhesive it is particularly preferable to apply a solventless type for the thermosetting epoxy resin adhesive, the thermosetting silicone adhesive, and the thermosetting polyurethane resin adhesive.
  • Some adhesives are used in a state where they are dissolved or dispersed in an organic solvent.
  • a solvent-free adhesive eliminates the need for treatment of the organic solvent, which is preferable from the environmental viewpoint.
  • the adhesive is extruded from the discharge port of the nozzle and applied directly to the magnet bonding surface of the slinger 25.
  • the slinger 25 is immersed in the adhesive solution, taken out, and then dried to remove the organic solvent.
  • the surface of the slinger 25 is preferably roughened by a mechanical treatment such as shot blasting or a chemical etching method in order to make the adhesion with the plastic magnet stronger.
  • the slinger 25 having the adhesive film formed thereon is used as a core, and a plastic magnet material is injection-molded on the surface to which the adhesive is applied. However, it is in a state of being hardened or solidified to such an extent that it does not flow out of the application surface of the slinger 25 by the injected molten plastic magnet material.
  • a heat treatment according to the type of adhesive. For example, the thermosetting epoxy resin adhesive is heated at 50 to 60 ° C. for about 40 minutes to 1 hour, and the thermosetting silicone adhesive is heated at 100 to 120 ° C. for about 30 minutes to 1 hour to be in a semi-cured state. .
  • the hot-melt adhesive can be used as it is because the coating film is solidified by leaving it at room temperature after application as described above. Such standing at room temperature eliminates the need for heat treatment equipment and can reduce production costs.
  • This insert molding only forms a plastic magnet material on a slinger, and the slinger 25 is taken out of the mold immediately after the molding. It is conceivable that the curing of the adhesive partly proceeds due to the heat of the melt of the plastic magnet material during the insert molding, but the adhesive is substantially hardly cured, and the molded product of the plastic magnet material (magnetic pole formation) The ring 27) is temporarily held so as not to fall off the slinger 25.
  • the slinger 25 and the magnetic pole forming ring 27 are firmly bonded to each other by heating to a temperature higher than the temperature for accelerating the reaction of the adhesive to advance and complete the bonding.
  • a heating method it is preferable to use a heating furnace because a large amount of precursor can be treated at once.
  • a disk gate type injection molding machine In insert molding, it is preferable to use a disk gate type injection molding machine.
  • the molten magnetic material spreads in a disk shape, and then flows into the mold corresponding to the inner diameter thick portion, so that the flake-like magnetic powder contained therein is oriented parallel to the surface.
  • the portion between the inner diameter portion and the outer diameter portion detected by the rotation sensor in the vicinity of the inner diameter thick portion has higher orientation and is very close to the axial anisotropy oriented in the thickness direction.
  • the anisotropy becomes closer to perfection.
  • the orientation of the weld part is completely anisotropic in the process of gradually increasing the viscosity of the molten magnetic material toward solidification. It is difficult to cause a crack or the like to occur in the welded portion where the magnetic field characteristics are lowered and the mechanical strength is lowered due to long-term use.
  • demagnetization is performed with a magnetic field opposite to the magnetization direction during cooling in the mold.
  • the adhesive is completely cured, and further demagnetized to a magnetic flux density of 2 mT or less, more preferably 1 mT or less, using an oil capacitor type demagnetizer.
  • gate cutting is performed, and heating is performed at a constant temperature for a certain time in a thermostatic bath or the like in order to completely cure the adhesive.
  • heating can be performed at a high temperature for a short time, such as high-frequency heating.
  • the manufacturing method of the present invention after the plastic magnet material is insert-molded into the slinger 25 to which the adhesive is applied, the holding for advancing the bonding becomes unnecessary, and the tact time is greatly shortened. Further, the treatment for completing the adhesion can also be performed in a heating furnace capable of performing a large amount of treatment. Therefore, the production efficiency is improved and the production cost is reduced.
  • the magnetic pole forming ring 27 is multipolar magnetized using a yoke coil to obtain a magnetic encoder.
  • the number of poles is about 70 to 130, preferably 90 to 120. If the number of poles is less than 70, the number of poles is too small and it is difficult to accurately detect the rotational speed. On the other hand, when the number of poles exceeds 130, each pitch becomes too small, and it is difficult to suppress a single pitch error, and practicality is low.
  • ferrite magnetic powder was put into the resin composition pellets, kneaded at 250 ° C. for 10 minutes using a biaxial extruder, and then extruded.
  • the magnetic powder was 60% by volume of the plastic magnet material.
  • the extruded magnetic powder-containing resin composition was pelletized.
  • a stainless steel slinger (see FIG. 2) having an L-shaped cross section was prepared, and the adhesive surface was roughened by shot blasting.
  • the adhesive shown in Table 1 was applied to the adhesive surface of the slinger and cured by heating at the indicated temperature and time.
  • a slinger coated with an adhesive was set on the mold of an injection molding machine, and insert molding was performed using the pellets of the above-described magnetic powder-containing resin composition. Then, after the insert molding was completed, the slinger was taken out of the mold and stored in a heating furnace, and heat treatment was performed at 150 ° C. for 1 hour to complete the bonding. Subsequently, after taking out from the heating furnace and cooling, the magnetic encoder test body was produced by magnetizing in multiple poles using a yoke coil.
  • Thermal shock resistance test A thermal shock test was repeatedly performed on the magnetic encoder specimens of the example and the comparative example. The test conditions were 1000 cycles, with one cycle consisting of holding (120 ° C. for 30 minutes) and holding ( ⁇ 40 ° C. for 30 minutes). And after 1000 cycles, while visually evaluating the external appearance, the damage state after a peeling test (forced peeling test of a plastic magnet part) was evaluated. The results are also shown in Table 1. In the appearance evaluation, “ ⁇ ” is marked in the table as good when there is no change in cracks, chips, cracks and product shape, and “ ⁇ ”was marked.
  • the magnetic encoder used for the wheel bearing can be efficiently manufactured with a shortened tact time, and the production cost of the magnetic encoder can be reduced.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

L'invention concerne un codeur magnétique qui est produit : en appliquant, pendant un moulage par insertion, un agent adhésif dans un état durci ou un état durci de façon à ne pas être balayé d'un élément fixe par une substance fondue d'un matériau d'aimant en matière plastique, ledit agent adhésif pouvant avoir un état de revêtement commandé au moyen d'un chauffage ; en retirant d'un moule, après achèvement du moulage par insertion, un article moulé pour chaque bague d'étanchéité ; et en chauffant ledit agent adhésif, après achèvement du moulage par injection, pour induire une adhérence et établir une liaison adhésive entre une partie d'aimant et l'élément fixe.
PCT/JP2014/074320 2013-09-20 2014-09-12 Codeur magnétique et son procédé de production WO2015041187A1 (fr)

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JP2013195854A JP2015059919A (ja) 2013-09-20 2013-09-20 磁気エンコーダ及びその製造方法
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JP7135617B2 (ja) * 2018-09-07 2022-09-13 中西金属工業株式会社 磁気エンコーダの製造方法
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