JP5352804B2 - Fixing method and structure of magnetic core - Google Patents
Fixing method and structure of magnetic core Download PDFInfo
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- JP5352804B2 JP5352804B2 JP2009120764A JP2009120764A JP5352804B2 JP 5352804 B2 JP5352804 B2 JP 5352804B2 JP 2009120764 A JP2009120764 A JP 2009120764A JP 2009120764 A JP2009120764 A JP 2009120764A JP 5352804 B2 JP5352804 B2 JP 5352804B2
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Abstract
Description
本発明は、磁性コアの固定方法及び構造に関し、特に、プローブのオスねじ部をコアのメスねじ孔に螺入させ、レーザー溶接で簡単に結合固定するための新規な改良に関する。 The present invention relates to a method and a structure for fixing a magnetic core, and more particularly to a novel improvement for easily connecting and fixing a male screw portion of a probe into a female screw hole of a core by laser welding.
従来、用いられていたこの種の磁性コアの固定方法及び構造としては、例えば、後述の特許文献1及び2に開示されているLVDT(直線型可変差動変圧器)においては、図5に示されるように構成されていた。
すなわち、図5において符号1で示されるものは、LVDTの図示しない筒状ステータ内に移動自在に設けられた長手棒状のプローブであり、このプローブ1の一端1aには、この一端1aと一体に形成されて突出するオスねじ部2が形成されている。
As a fixing method and structure of this type of magnetic core that has been conventionally used, for example, in an LVDT (linear variable differential transformer) disclosed in Patent Documents 1 and 2 described later, it is shown in FIG. Was configured to be.
That is, what is indicated by reference numeral 1 in FIG. 5 is a long rod-like probe that is movably provided in a cylindrical stator (not shown) of the LVDT, and one end 1a of the probe 1 is integrally formed with the one end 1a. A male screw portion 2 that is formed and protrudes is formed.
前記オスねじ部2には、コア3の一端3aに形成されたメスねじ孔4が螺合している。
前記コア3のメスねじ孔4内に前記プローブ1のオスねじ部2が螺合した状態で、ねじのゆるみ防止のため、銀ろう10及び接着剤11が用いられ、この螺合した部分に形成された接着面が銀ろう付けで固定されている。
A female screw hole 4 formed at one end 3 a of the
In the state where the male screw portion 2 of the probe 1 is screwed into the female screw hole 4 of the
従来の磁性コアの固定方法及び構造は、以上のように構成されているため、次のような課題が存在していた。
すなわち、プローブとコアのねじ螺合部に形成された接着部に銀ろうを形成させる銀ろう付けには、実際には多くの作業工程を必要とし、かつ、その作業も難しいために熟練を要し、時間もかかっていた。
また、プローブとコアのねじ螺合部の固定に用いられる接着剤では、強度的に弱い面があり、十分な信頼性を得ることは困難であった。
Since the conventional magnetic core fixing method and structure are configured as described above, the following problems exist.
In other words, silver brazing that forms a silver solder at the joint formed on the screw threaded part of the probe and the core actually requires a lot of work processes and is difficult, and requires skill. And it took time.
In addition, the adhesive used for fixing the screwed portion of the probe and the core has a weak surface, and it has been difficult to obtain sufficient reliability.
本発明による磁性コアの固定方法は、長手棒状をなすLVDTのプローブと、前記プローブの一端に形成されたオスねじ部をコアの一端のメスねじ孔に螺入させ、前記プローブと前記コアとを接続し、前記コアの外周に形成され前記コアの軸心に向けて円錐状をなすと共に前記オスねじ部の位置に対応する円錐凹部にレーザーを照射し、前記コアとプローブのオスねじ部とをレーザー溶接する方法において、前記レーザー照射前の前記オスねじ部とメスねじ孔とは、ねじ結合のみで接着剤は設けられておらず、前記円錐凹部の円錐中心は前記コアの軸心に向けて円錐状に形成され、YAGレーザーからなる前記レーザーは前記円錐凹部の円錐中心に照射され、前記コア及び前記オスねじ部の一部が熱によって溶融し、かつ、一体化する方法であり、また、本発明による磁性コアの固定構造は、長手棒状をなすLVDTのプローブと、前記プローブの一端に形成されたオスねじ部をコアの一端のメスねじ孔に螺入させ、前記プローブと前記コアとを接続し、前記コアの外周に形成され前記コアの軸心に向けて円錐状をなすと共に前記オスねじ部の位置に対応する円錐凹部にレーザーを照射し、前記コアとプローブのオスねじ部とをレーザー溶接した構成において、前記レーザー照射前の前記オスねじ部とメスねじ孔とは、ねじ結合のみで接着剤は設けられておらず、前記円錐凹部の円錐中心は前記コアの軸心に向けて円錐状に形成され、YAGレーザーからなる前記レーザーは前記円錐凹部の円錐中心に照射され、前記コア及び前記オスねじ部の一部が熱によって溶融し、かつ、一体化する構成である。 Method of fixing the magnetic core according to the present invention, a probe of to LVDT such a longitudinal rod-Toe screwed a male threaded portion formed at one end of the probe into the female screw hole of one end of the core, the probe and the core the door connect, by irradiating a laser to the conical recess corresponding with to such a conically position of the male thread portion toward the axis of the core is formed on the outer periphery of the core, male of the core and probe in how laser welding a threaded portion, said front said laser irradiation and the male screw portion and the female screw hole, the screw coupling only the adhesive is not provided, the cone center of said conical recess of said core A conical shape formed toward the axis, and the YAG laser is irradiated to the conical center of the conical recess, and the core and a part of the male screw part are melted by heat and integrated. In law Ri, The fixed structure of the magnetic core according to the present invention, a probe of to LVDT such a longitudinal rod-Toe screwed a male threaded portion formed at one end of the probe into the female screw hole of one end of the core, the the probe and the core connect, by irradiating a laser in a circular cone recess corresponding to the position of the male threaded portion with to such a conical shape toward the axis of the core is formed on the outer periphery of the core, the in configurations that laser welding a core and a male threaded portion of the probe, the prior said laser irradiation and the male screw portion and the female screw hole, the screw coupling only the adhesive is not provided, cone of said conical recess The center is formed in a conical shape toward the axis of the core, the laser composed of a YAG laser is applied to the conical center of the conical recess, the core and a part of the male screw part are melted by heat, and , One A configuration that.
本発明による磁性コアの固定方法及び構造は、以上のように構成されているため、次のような効果を得ることができる。
すなわち、長手棒状をなすプローブと、前記プローブの一端に形成されたオスねじ部をコアの一端のメスねじ孔に螺入させ、前記プローブと前記コアとを接続し、前記コアの外周に形成され前記コアの軸心に向けて円錐状をなす円錐凹部の円錐中心にレーザーを照射し、前記コアとプローブのオスねじ部とをレーザー溶接することにより、円錐凹部を介してレーザー照射が容易となり、コアの所定位置でのプローブに対する固定が容易となり、簡単にプローブとコアの相互固定を行うことができる。
また、前記レーザー照射前の前記オスねじ部とメスねじ孔とは、ねじ結合のみで接着剤は設けられていないことにより、接着剤の全く不要な固定構造を得ることができる。
Since the magnetic core fixing method and structure according to the present invention are configured as described above, the following effects can be obtained.
That is, a probe that forms a longitudinal bar-Toe screwed a male threaded portion formed at one end of the probe into the female screw hole of one end of the core, connect the said and the probe core, formed on the outer periphery of the core by irradiating a laser to the cone center of the conical recess forming a conical shape toward the axis of the core, by laser welding the male threaded portion of the core and probe, easy laser irradiation through the conical recess Thus, the core can be easily fixed to the probe at a predetermined position, and the probe and the core can be easily fixed to each other.
Further, since the male screw portion and the female screw hole before the laser irradiation are merely screw-bonded and no adhesive is provided, a fixing structure that requires no adhesive can be obtained.
本発明は、プローブのオスねじ部をコアのメスねじ孔に螺入させ、レーザー溶接で簡単に結合固定するようにした磁性コアの固定方法及び構造を提供することを目的とする。 It is an object of the present invention to provide a magnetic core fixing method and structure in which a male screw portion of a probe is screwed into a female screw hole of a core and is simply coupled and fixed by laser welding.
以下、図面と共に本発明による磁性コアの固定方法及び構造の好適な実施の形態について説明する。
尚、従来例と同一又は同等部分については、同一符号を用いて説明する。
図1において、符号1で示されるものは、LVDTの図示しない筒状ステータ内に移動自在に設けられた長手棒状のプローブであり、このプローブ1の一端1aには、この一端1aと一体に形成されて突出するオスねじ部2が形成されている。
Hereinafter, preferred embodiments of a magnetic core fixing method and structure according to the present invention will be described with reference to the drawings.
Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.
In FIG. 1, what is indicated by reference numeral 1 is a longitudinal bar-like probe that is movably provided in a cylindrical stator (not shown) of the LVDT, and is formed at one end 1a of the probe 1 integrally with the one end 1a. Thus, a protruding male screw portion 2 is formed.
前記オスねじ部2には、コア3の一端3aに形成されたメスねじ孔4が螺合している。
前記コア3のメスねじ孔4内に前記プローブ1のオスねじ部2が螺合した状態で、ねじのゆるみ防止のため、図4に示されるレーザー溶接部20が形成されている。
前記レーザー溶接部20は、図1から図4で示されるように、前記コア3の外周面3bに円錐凹部21が形成され、この円錐凹部21は前記オスねじ部2の位置に対応し、その円錐中心21aは前記コア3の軸心に向けて円錐状に形成されている。
A female screw hole 4 formed at one end 3 a of the
In the state where the male screw portion 2 of the probe 1 is screwed into the female screw hole 4 of the
As shown in FIGS. 1 to 4, the laser welding portion 20 has a conical recess 21 formed on the outer
前記円錐凹部21に対して、図1に示されるように、YAGレーザーからなるレーザー22を照射させることにより、このレーザー22は円錐凹部21の円錐中心21aに照射され、図4で示されるように、コア3及びオスねじ部2の一部が熱によって溶融し、かつ一体化し、レーザー照射を停止することにより、この溶融した部分が固化し、前記レーザー溶接部20となる。尚、前述のレーザー溶接の場合、オスねじ部2とメスねじ孔4との接続部は、従来のように接着剤を塗布すると、レーザー照射時に接着剤が気化し、ブローホールができやすく、レーザー溶接が困難となるため、ねじ結合のみで接着剤は用いていない。
As shown in FIG. 1, by irradiating the conical recess 21 with a
前記レーザー溶接部20は、図4で示されるように、前記コア3とオスねじ部2の各一部にわたって形成されているため、コア3とオスねじ部2は強固に一体化され、プローブ1の長年にわたるLVDTとしての使用に十分耐えることができるように構成されている。
As shown in FIG. 4, the laser welded portion 20 is formed over each part of the
本発明による磁性コアの固定方法及び構造は、磁性コアと金属からなるプローブとの接続に限ることなく、金属と樹脂、金属同志、樹脂同志のオス部とメス部の接続固定に広く適用することができる。 The fixing method and structure of the magnetic core according to the present invention are not limited to the connection between the magnetic core and the probe made of metal, but widely applied to the connection and fixing of the metal and the resin, the metal, and the male and female parts of the resin. Can do.
1 プローブ
1a 一端
2 オスねじ部
3 コア
3a 一端
3b 外周面
4 メスねじ孔
20 レーザー溶接部
21 円錐凹部
22 レーザー
DESCRIPTION OF SYMBOLS 1 Probe 1a One end 2
Claims (2)
前記コア(3)の外周に形成され前記コア(3)の軸心に向けて円錐状をなすと共に前記オスねじ部(2)の位置に対応する円錐凹部(21)にレーザー(22)を照射し、前記コア(3)とプローブ(1)のオスねじ部(2)とをレーザー溶接する磁性コアの固定方法において、
前記レーザー照射前の前記オスねじ部(2)とメスねじ孔(4)とは、ねじ結合のみで接着剤は設けられておらず、前記円錐凹部(21)の円錐中心(21a)は前記コア(3)の軸心に向けて円錐状に形成され、YAGレーザーからなる前記レーザー(22)は前記円錐凹部(21)の円錐中心(21a)に照射され、前記コア(3)及び前記オスねじ部(2)の一部が熱によって溶融し、かつ、一体化することを特徴とする磁性コアの固定方法。 A longitudinal rod-like, such a to LVDT the probe (1), female screw holes (4 one end (3a) of the end male threaded portion formed on (1a) and (2) the core (3) of the probe (1) ) to let screwed, connect the said core probe (1) (3),
Said core (3) outer periphery formed the core of the (3) the conjunction to such a conical shape toward the shaft center male threaded portion (2) circle cone recesses corresponding to the position of (21) to the laser (22) in the irradiating, the core (3) and the male threaded portion of the probe (1) (2) and fixed how the magnetic core you laser welding,
The male screw portion (2) and the female screw hole (4) before the laser irradiation are only screw-coupled and no adhesive is provided, and the conical center (21a) of the conical recess (21) is the core. The laser (22) formed in a conical shape toward the axis of (3) and made of a YAG laser is applied to the conical center (21a) of the conical recess (21), and the core (3) and the male screw part (2) is part of the melted by heat, and the method of fixing the magnetic core you wherein the integrated child.
前記コア(3)の外周に形成され前記コア(3)の軸心に向けて円錐状をなすと共に前記オスねじ部(2)の位置に対応する円錐凹部(21)にレーザー(22)を照射し、前記コア(3)とプローブ(1)のオスねじ部(2)とをレーザー溶接した磁性コアの固定構造において、
前記レーザー照射前の前記オスねじ部(2)とメスねじ孔(4)とは、ねじ結合のみで接着剤は設けられておらず、前記円錐凹部(21)の円錐中心(21a)は前記コア(3)の軸心に向けて円錐状に形成され、YAGレーザーからなる前記レーザー(22)は前記円錐凹部(21)の円錐中心(21a)に照射され、前記コア(3)及び前記オスねじ部(2)の一部が熱によって溶融し、かつ、一体化することを特徴とする磁性コアの固定構造。 A longitudinal rod-like, such a to LVDT the probe (1), female screw holes (4 one end (3a) of the end male threaded portion formed on (1a) and (2) the core (3) of the probe (1) ) to let screwed, connect the said core probe (1) (3),
Said core (3) outer periphery formed the core of the (3) the conjunction to such a conical shape toward the shaft center male threaded portion (2) circle cone recesses corresponding to the position of (21) to the laser (22) in the irradiating, the core (3) and the male screw portion (2) and the fixed structure of the magnetic core that laser welding the probe (1),
The male screw portion (2) and the female screw hole (4) before the laser irradiation are only screw-coupled and no adhesive is provided, and the conical center (21a) of the conical recess (21) is the core. The laser (22) formed in a conical shape toward the axis of (3) and made of a YAG laser is applied to the conical center (21a) of the conical recess (21), and the core (3) and the male screw part melted partially by the heat of the (2), and a fixed structure of the magnetic core you wherein the integrated child.
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