CN114962484B - Inner plunger of electromagnetic valve assembly for clutch of automobile differential and manufacturing method thereof - Google Patents
Inner plunger of electromagnetic valve assembly for clutch of automobile differential and manufacturing method thereof Download PDFInfo
- Publication number
- CN114962484B CN114962484B CN202110199931.9A CN202110199931A CN114962484B CN 114962484 B CN114962484 B CN 114962484B CN 202110199931 A CN202110199931 A CN 202110199931A CN 114962484 B CN114962484 B CN 114962484B
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- Prior art keywords
- wheel
- synthetic resin
- plunger
- outer wheel
- valve assembly
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 39
- 239000000057 synthetic resin Substances 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 238000000465 moulding Methods 0.000 claims description 14
- 238000001746 injection moulding Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 abstract 1
- 239000012212 insulator Substances 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 241000239290 Araneae Species 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D27/14—Details
-
- 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
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/20—Arrangements for suppressing or influencing the differential action, e.g. locking devices
- F16H48/30—Arrangements for suppressing or influencing the differential action, e.g. locking devices using externally-actuatable means
- F16H48/34—Arrangements for suppressing or influencing the differential action, e.g. locking devices using externally-actuatable means using electromagnetic or electric actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D2027/008—Details relating to the magnetic circuit, or to the shape of the clutch parts to achieve a certain magnetic path
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetically Actuated Valves (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
汽车差速器的离合器用电磁阀总成的内柱塞及其制造方法。本发明提供一种汽车差速器的离合器用电磁阀总成的内柱塞，贡献于电磁阀总成的轻量化和节省成本，内柱塞的形状多样化并减少与内壳的摩擦力并提高功能，本发明的汽车差速器的离合器用电磁阀总成的内柱塞由结合构成电磁阀总成的绕线管的内柱塞的外轮和与内壳结合的内轮构成，所述内轮由成型性优秀的绝缘体合成树脂成型，在由构成内柱塞的合成树脂构成的内轮的外缘嵌件磁性金属作为外轮，在形成于外轮的限位槽填充内轮的合成树脂，构成得使形成于内轮的垫片支撑外轮。
An inner plunger of a clutch solenoid valve assembly for an automobile differential and a manufacturing method thereof. The present invention provides an inner plunger of a clutch solenoid valve assembly for an automobile differential, which contributes to the lightweight and cost saving of the solenoid valve assembly. The inner plunger has a diversified shape and reduces the friction with the inner shell and improves the function. The inner plunger of the clutch solenoid valve assembly for an automobile differential of the present invention is composed of an outer wheel of the inner plunger combined with a winding tube constituting the solenoid valve assembly and an inner wheel combined with the inner shell. The inner wheel is molded from an insulating synthetic resin with excellent moldability. A magnetic metal is inserted as an outer wheel on the outer edge of the inner wheel composed of the synthetic resin constituting the inner plunger, and the synthetic resin of the inner wheel is filled in the limiting groove formed on the outer wheel, so that the gasket formed on the inner wheel supports the outer wheel.
Description
Technical Field
The present invention relates to an inner plunger of a coil assembly of a solenoid valve for a clutch of an automobile differential and a method of manufacturing the same, and more particularly, to an inner plunger which improves quality and productivity of an inner plunger constituting a solenoid valve assembly for a clutch and realizes weight reduction, and a method of manufacturing the same.
Background
As is well known, a differential gear of an automobile distributes the driving force of an engine according to the resistance of wheels on both sides, a differential case (DIFFERENTIAL CASE) is rotatably provided in a rack, and the differential case is internally provided with a spider (spyder) having a pinion (pinion) and a side gear engaged with both sides of the pinion, and the side gears and a hub (hub) of the wheels are connected by a drive shaft (DRIVE SHAFT) to transmit the engine power.
In the differential of the automobile performing the above-described function, a solenoid valve assembly solenoid assembly performing the function of a running clutch (clutch) functions as a connecting or disconnecting differential locking device by operating an outer plunger (out plunger) and an Inner plunger (Inner plunger) or piston (piston) by using magnetic force generated by a coil assembly inside.
In the case of describing the structure of the inner plunger constituting the electromagnetic valve assembly for clutch of differential gear performing the above-described function, the inner ring of the inner plunger closely coupled to the inner case is made of stainless steel so as not to be affected by magnetic force and to move, and the outer ring is made of magnetic metal for forming electromagnetic force of coil.
As described above, in order to form a magnetic force on the outer ring without generating a magnetic force on the inner ring, two kinds of metals having different materials are integrally formed, and the two kinds of metals are welded to each other by this method or precision machining is required by precision machining processes of respective steps, which results in a corresponding disadvantage of high manufacturing cost.
In particular, the inner and outer wheels of the inner plunger are integrally formed of metal, and are very heavy in weight.
Accordingly, there is a disadvantage that the function of the electromagnetic valve assembly is lowered in spite of the fact that the weight of the automobile is reduced, and in the case of stainless steel, there are a great number of problems in the structure of the inner plunger, such as the shape of the inner plunger, which is limited to be manufactured, due to the poor formability.
Prior art literature
Patent literature
Korean laid-open patent No. 10-1983-0003671 (22 th month of 1983. Public. Publication)
Korean registered patent No. 10-1660641 (2016, 09, 21. Registration)
Disclosure of Invention
Technical problem to be solved by the invention
In order to solve the above problems, an object of the present invention is to provide an inner plunger of a solenoid valve assembly for a clutch of an automotive differential, which contributes to weight reduction and cost saving of the solenoid valve assembly, diversification of the shape of the inner plunger, and reduction of friction with an inner housing to enhance the function of the solenoid valve assembly.
Technical scheme for solving problems
In order to achieve the above object, an inner plunger of a solenoid valve assembly for a clutch of an automotive differential according to the present invention is composed of an outer wheel coupled to a bobbin and an inner wheel coupled to an inner housing.
The inner ring of the inner plunger constructed as described above is molded from an insulator synthetic resin having excellent moldability, and a magnetic metal is inserted as an outer ring at an outer edge of the inner ring made of the synthetic resin constituting the inner plunger.
In order to firmly connect the outer wheel made of the metal with the inner wheel made of the insulator synthetic resin, more than three limit grooves are formed in a mode that the inlet is narrow and the inside is wider, the limit grooves are filled with the synthetic resin for forming the inner wheel, and a gasket integrally formed with the inner wheel is integrally formed at the lower end of the outer wheel.
An undercut groove is formed between upper and lower supporting parts on the inside of the inner wheel formed of the synthetic resin to reduce friction with the inner shell.
The manufacturing method of the inner plunger of the electromagnetic valve assembly for the clutch is injection molding by a mold composed of a mold body and a magnetic core, wherein the mold body has a space for inserting an outer wheel of the inner plunger and a support for supporting a lower end of the outer wheel at a lower portion of the space, and is composed of a space for forming a gasket integrally formed with the inner wheel and a space for molding the inner wheel, and the magnetic core has an undercut groove molding portion for forming an undercut groove between upper and lower support portions of the inner wheel to reduce friction with the inner shell.
The present invention is characterized in that an outer ring made of magnetic metal is provided in a space for forming an insert in an outer ring of an inner plunger of a mold body having the above-described structure, a lower end of the outer ring is closely attached to a support, a core having an undercut groove forming portion is coupled to an intermediate portion of the mold body, and then the inner ring is formed of a non-magnetic synthetic resin by injection molding.
ADVANTAGEOUS EFFECTS OF INVENTION
As described above, according to the present invention, the inner ring of the inner plunger constituting the solenoid valve assembly is made of synthetic resin, and the outer ring is made of magnetic metal, thereby improving productivity of the solenoid valve assembly and promoting cost saving.
In particular, the quality of the solenoid valve assembly can be improved by firmly connecting the outer wheel and the inner wheel through the limit groove formed on the outer wheel and the gasket formed on the inner wheel.
The inner ring is molded by injection molding, so that the shape of the inner plunger is diversified, the weight is reduced, and the friction force with the inner housing is reduced, thereby performing a smooth sliding operation.
Drawings
FIG. 1 is a perspective view showing the structure of an inner plunger of the present invention;
FIG. 2 is a cross-sectional view showing the structure of the inner plunger of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a partial cross-sectional view showing a solenoid valve assembly provided with an inner plunger of the present invention;
FIG. 5 is a partial cross-sectional view showing a mold for manufacturing an inner plunger of the present invention;
FIG. 6 is a partial sectional view showing a state of molding an inner plunger of the present invention;
fig. 7 is a partial cross-sectional view showing the release of the inner plunger of the present invention from the mold.
Description of the reference numerals
1 Inner plunger
2 Inner wheel
2-1 Undercut groove
2-2 Support
2-3 Supporting part
3 Outer wheel
3-1 Spacing groove
10 Bobbin
30 Mould body
30-1 Outer wheel insertion space
30-2 Inner wheel Forming space
30-3 Spacer forming space
30-4 Support
40-1 Undercut groove forming portion
40 Magnetic core
50:Mould
Detailed Description
The inner plug and the method for manufacturing the same according to the present invention will be described in more detail below, and the description will be made based on the embodiments for realizing the present invention, but the technical idea to be pursued by the present invention is not limited to the form described herein, and should be understood to include various modifications (modifications), equivalents (equivalents), and/or substitutes (ALTERNATIVES) of the embodiments of the present invention.
Further, in the embodiments of the present invention, even if the operational effects of the structure of the present invention are not explicitly described, the effects predicted by the corresponding structure should be certainly confirmed.
The structure of the inner plunger of the electromagnetic valve assembly for clutch of automobile differential according to the present invention will be specifically described with reference to the accompanying drawings.
Referring to fig. 1 to 4, an inner plunger 1 of a solenoid valve assembly for a clutch according to the present invention includes an outer ring 3 of the inner plunger, constituting a solenoid valve assembly, a bobbin 10 for coupling electromagnetic force, and an inner ring 2 integrally formed with the outer ring 3 to be coupled with an inner case 20, wherein the inner plunger thus constituted plays a role of reciprocating in the inner case 20 by electromagnetic force formed with the bobbin 10.
The inner ring 2 of the inner plunger 1 functioning as described above is made of an insulator synthetic resin excellent in moldability, and the outer ring 3 made of a magnetic metal is fitted to the outer edge of the inner ring 2 made of a synthetic resin as described above.
Three or more limit grooves 3-1 are formed at equal angular distribution in the outer ring 3 composed of the metal for firmly coupling with the inner ring 2 composed of the insulator synthetic resin, and the synthetic resin forming the inner ring 2 is filled in the limit grooves 3-1 during the insert molding.
The limit grooves 3-1 are formed in such a manner that the inlet is narrow and the inner sides thereof are gradually expanded, and when the synthetic resin forming the inner wheel 2 is just filled into the limit grooves 3-1, the synthetic resin forming the inner wheel 2 is firmly coupled to each other, and even if the synthetic resin forming the inner wheel 2 is shrunk and deformed, the occurrence of gaps or movements between the synthetic resin and the inner wheel can be completely prevented, and particularly, the form of the limit grooves 3-1 prevents the inner wheel 2 from being shrunk toward the center side according to the characteristic that the inlet is narrow and the inner sides thereof are gradually expanded, thereby minimizing the occurrence of the gaps.
Further, when the inner wheel 2 is molded, the engaging base 2-4 engaging the upper end of the outer wheel 3 is formed, and the spacer 2-2 is formed so as to integrally protrude from the lower end of the inner wheel 2 at a position corresponding to the lower end of the outer wheel 3, thereby supporting the upper and lower ends of the outer wheel 3 and completely preventing the outer wheel from slipping in the upper and lower directions.
An undercut groove 2-1 is formed between the upper and lower support parts 2-3 so that friction with the inner case is reduced inside the inner case 2 made of the synthetic resin.
Unexplained symbol 10-1 of the drawing refers to a coil.
The method for manufacturing the inner plunger of the electromagnetic valve assembly for the clutch is carried out through a die and insert molding.
A mold for insert molding an inner plunger will be described with reference to fig. 5 and 6.
The mold 50 is composed of a mold body 30 and a core 40, the mold body 30 has an outer wheel insertion space 30-1 for inserting an outer wheel 3 of an inner plunger, a support 30-4 for supporting a lower end of the outer wheel 3 is formed at a lower portion of the outer wheel insertion space 30-1, and is composed of a spacer forming space 30-3 for forming a spacer 2-2 integrally formed with the inner wheel 2 and an inner wheel forming space 30-2 for forming the inner wheel 2 from synthetic resin. The core 40 constitutes an undercut groove forming part 40-1 to form an undercut groove 2-1 between the upper and lower support parts 2-3 of the inner wheel to reduce friction with the inner wheel 2.
After the outer ring 3 made of magnetic metal is inserted into the mold 50 configured as described above, the outer ring 3 is insert molded in the process of molding the inner ring 2 from synthetic resin.
In the specific explanation, the outer ring 3 made of magnetic metal is placed in the outer ring insertion space 30-1 formed in the mold body 30 for the outer ring of the insert inner plunger, the lower end of the outer ring is closely attached to the support 30-4, and the core 40 having the undercut groove forming portion 40-1 is coupled to the middle of the mold body 30, and then injection molding by an injection molding machine is performed.
The inner ring 2 is formed of a non-magnetic synthetic resin by injection molding, the inner plunger 1 of the outer ring 3 made of a magnetic metal is molded into the outer edge of the inner ring 2 made of a synthetic resin, and the inner plunger 1 is manufactured by demolding.
In this process, the synthetic resin forming the inner wheel 2 is filled in the limit groove 3-1 formed in the outer wheel 3, the inner wheel 2 and the outer wheel 3 are firmly coupled, and at the same time, the synthetic resin is also filled in the gasket molding space 30-3 formed in the lower portion of the mold body 30, the gasket 2-2 is integrally molded in the lower end of the inner wheel 2, and insert molding is completed in a form of supporting the outer wheel 3.
The operation of the inner plunger of the electromagnetic valve assembly for clutch of the differential gear of the present invention configured as described above will be specifically described below.
First, the basic function of the electromagnetic valve assembly for the clutch of the differential of the automobile will be specifically described.
In a state of being combined with the inner case 20 installed at the automobile differential and constituting the differential, when the differential is required to be operated, electricity is supplied to the bobbin 10 to form an electromagnetic force.
And the magnetic force generated by the magnetic field generated at the bobbin 10 acts as the inner plunger 1 moving along the inner case 20.
The above-described operation is a general operation of the electromagnetic valve assembly for a clutch of an automobile differential, and a specific description thereof is omitted, and only the operation of the structure of the inner plunger will be described.
First, when the inner plunger 1 moves along the inner housing 20 by electromagnetic force generated by the magnetic field generated by the bobbin 10, the inner ring 2 constituting the inner plunger 1 is made of synthetic resin, thereby reducing the influence of electromagnetic force and improving responsiveness, and thus helping to play a role of moving the inner plunger 1 along the inner housing 20.
In particular, the inner wheel 2 is formed of a non-magnetic synthetic resin, and the undercut groove 2-1 is more simply formed on the inner surface of the entire inner wheel 2, thereby reducing friction with the inner housing 20 while reciprocating along the inner housing 20, whereby the inner plunger is released from friction resistance to function as an aid in reciprocating along the inner housing 20.
The inner ring 2 of the inner plunger is formed of a non-magnetic synthetic resin, and the inner plunger has a variety of shapes due to excellent moldability, thereby improving the function and productivity of the inner plunger shape.
The outer edge of the inner ring 2 of the inner plunger is embedded with magnetic metal as the outer ring 3, and particularly, the outer ring and the inner ring are prevented from being separated in the diameter direction by filling the synthetic resin forming the inner ring 2 into more than three limit grooves 3-1 formed in the outer ring 3, and the clamping table 2-4 and the gasket 2-2 which firmly support the upper and lower ends of the outer ring 3 are formed to prevent the outer ring and the inner ring from being separated in the axial direction, thereby being capable of maintaining long-time durability.
Further, the outer ring 3 is formed of the magnetic metal inserted into the outer periphery of the inner ring 2 of the inner plunger, and the electromagnetic force generated in the bobbin 10 is not lost, so that the inner plunger operates smoothly.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110199931.9A CN114962484B (en) | 2021-02-23 | 2021-02-23 | Inner plunger of electromagnetic valve assembly for clutch of automobile differential and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110199931.9A CN114962484B (en) | 2021-02-23 | 2021-02-23 | Inner plunger of electromagnetic valve assembly for clutch of automobile differential and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114962484A CN114962484A (en) | 2022-08-30 |
| CN114962484B true CN114962484B (en) | 2025-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110199931.9A Active CN114962484B (en) | 2021-02-23 | 2021-02-23 | Inner plunger of electromagnetic valve assembly for clutch of automobile differential and manufacturing method thereof |
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| Country | Link |
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| CN (1) | CN114962484B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019105370A (en) * | 2017-12-12 | 2019-06-27 | ジーケーエヌ・オートモーティブ・リミテッド | Electromagnetic actuator for vehicle differentials |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5914333B2 (en) * | 1977-09-26 | 1984-04-04 | 第一ガイヤ−株式会社 | Open core installed in mold for injection molding |
| JP4365050B2 (en) * | 2001-04-25 | 2009-11-18 | 積水化成品工業株式会社 | Insulated container and manufacturing method thereof |
| JP3803072B2 (en) * | 2002-06-24 | 2006-08-02 | 株式会社アクトワン | Multi-core ferrule and method for manufacturing multi-core ferrule |
| KR100665772B1 (en) * | 2005-06-22 | 2007-01-09 | 주식회사 피이케이 | Armature fixed rubber damper of clutch for compressor |
| JP2007315583A (en) * | 2006-01-31 | 2007-12-06 | Ｇｋｎ ドライブライン トルクテクノロジー株式会社 | Clutch device and differential device using it |
| JP4971752B2 (en) * | 2006-11-06 | 2012-07-11 | Ｇｋｎドライブラインジャパン株式会社 | Electromagnetic solenoid and power transmission device using the same |
| JP4968907B2 (en) * | 2007-02-27 | 2012-07-04 | セイコーインスツル株式会社 | Hydrodynamic bearing device, motor, recording medium driving device, and bearing sleeve manufacturing method |
| US8591375B2 (en) * | 2009-11-04 | 2013-11-26 | GKN Driveline Japan Ltd. | Clutch device |
| JP5547045B2 (en) * | 2010-03-30 | 2014-07-09 | 古河電池株式会社 | Bushing manufacturing method and bushing mold |
| WO2015115298A1 (en) * | 2014-01-29 | 2015-08-06 | アイシン・エィ・ダブリュ株式会社 | Electromagnetic driving device and method for manufacturing electromagnetic driving device |
| WO2016035129A1 (en) * | 2014-09-02 | 2016-03-10 | Ｇｋｎ ドライブライン ジャパン株式会社 | Differential device |
| JP6343091B2 (en) * | 2015-02-23 | 2018-06-13 | Ｇｋｎドライブラインジャパン株式会社 | Differential device |
| KR101682299B1 (en) * | 2015-05-13 | 2016-12-02 | 주식회사 신라공업 | Vehicle actuated clutches and differential devices assy |
| KR102042255B1 (en) * | 2016-11-22 | 2019-11-11 | 현대자동차(주) | Solid type brake disc and manufacturing method of the same |
| JP7040210B2 (en) * | 2018-03-28 | 2022-03-23 | 中西金属工業株式会社 | A method for manufacturing a protective cover having a sensor holder portion, a bearing device provided with the protective cover, and a protective cover having a sensor holder portion. |
| CN111120618A (en) * | 2019-12-18 | 2020-05-08 | 伍晓明 | Electromagnetic stop dog |
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2021
- 2021-02-23 CN CN202110199931.9A patent/CN114962484B/en active Active
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| JP2019105370A (en) * | 2017-12-12 | 2019-06-27 | ジーケーエヌ・オートモーティブ・リミテッド | Electromagnetic actuator for vehicle differentials |
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