JPH09149583A - Brush equipment - Google Patents
Brush equipmentInfo
- Publication number
- JPH09149583A JPH09149583A JP7306098A JP30609895A JPH09149583A JP H09149583 A JPH09149583 A JP H09149583A JP 7306098 A JP7306098 A JP 7306098A JP 30609895 A JP30609895 A JP 30609895A JP H09149583 A JPH09149583 A JP H09149583A
- Authority
- JP
- Japan
- Prior art keywords
- brush
- coil spring
- terminal body
- electromagnetic interference
- convex portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 8
- 210000000078 claw Anatomy 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
Landscapes
- Motor Or Generator Current Collectors (AREA)
- Motor Or Generator Frames (AREA)
Abstract
(57)【要約】
【課題】 装着用爪等を使用せずとも、ブラシホルダに
装着し、キャップにより固定する際にキャップと一緒に
端子体が回転することがないと共に電磁妨害波のバラツ
キを少なくすることのできるブラシ装置を提供すること
である。
【解決手段】 端子体３のブラシ１側にコイルスプリン
グ４内径より大きな凸部５を設け、コイルスプリング４
を凸部５により径方向に広げて装設した。更に、ブラシ
１の端子体３側にコイルスプリング４内径より小さな凸
部６を設け、コイルスプリング４のブラシ１側端部を緩
やかに拘束した。
(57) 【Abstract】 PROBLEM TO BE SOLVED: To prevent the terminal body from rotating together with the cap when it is mounted on the brush holder and fixed by the cap without using a mounting claw or the like, and to prevent the variation of electromagnetic interference waves. It is to provide a brush device that can be reduced in number. SOLUTION: A protrusion 5 larger than the inner diameter of the coil spring 4 is provided on the brush 1 side of the terminal body 3,
Was extended by the convex portion 5 in the radial direction and installed. Further, a convex portion 6 smaller than the inner diameter of the coil spring 4 is provided on the terminal body 3 side of the brush 1, and the end portion of the coil spring 4 on the brush 1 side is gently restrained.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電動工具等の整流子
電動機に用いられ、ブラシに可撓性を有するリード線を
介して電気的に接続される端子体と、端子体とブラシと
の間に装設されるコイルスプリングとを有するブラシ装
置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a commutator electric motor such as an electric power tool, and has a terminal body electrically connected to a brush via a flexible lead wire, and between the terminal body and the brush. The present invention relates to a brush device having a coil spring mounted on the.
【０００２】[0002]
【従来の技術】整流子電動機は、周知のように電磁妨害
波を発生するものであり、他の電気機器に電磁妨害を及
ぼしていた。電磁妨害波の発生は、整流コイルの電流変
化の高周波数成分が電磁妨害波になる狭義の整流作用に
起因するものと、ブラシと整流子の摺動時における接触
不良によって整流コイルの電流が変化した時の高周波数
成分が電磁妨害波になる摺動接触不良に起因するものに
分離される。しかし、両者の分離測定は困難であり、普
通は両者を合わせて広義の整流作用に起因する電磁妨害
波としている。ただ、後者の摺動接触不良に起因する電
磁妨害波は、電磁妨害波測定を同一製品の多数台につい
て実施したときにその分散が大きいとして計測される。
後者の摺動接触不良に起因する電磁妨害波発生原因の一
つに、ブラシを押圧付勢するコイルスプリングの力がブ
ラシと端子体の双方に全体的に垂直に作用しないために
発生するという原因がある。これは、コイルスプリング
の力が整流子の回転方向や整流子軸方向に作用している
と、整流子の偏心や整流子表面の凹凸、電機子のアンバ
ランス、電機子や電動機全体の振動、ブラシと整流子の
摺動時の摩擦等によってコイルスプリングの力が乱れて
しまい、ブラシと整流子の摺動時における接触が不安定
になるためである。2. Description of the Related Art A commutator motor, as is well known, generates an electromagnetic interference wave and exerts electromagnetic interference on other electric devices. The generation of electromagnetic interference waves is caused by the narrowly defined rectification action where high-frequency components of the current change of the rectification coil become electromagnetic interference waves, and the current of the rectification coil changes due to poor contact when the brush and commutator slide. The high frequency component at the time of being separated becomes an electromagnetic interference wave and is separated into those caused by poor sliding contact. However, it is difficult to separate and measure the two, and usually both are combined to form an electromagnetic interference wave caused by a rectifying action in a broad sense. However, the electromagnetic interference wave caused by the latter sliding contact failure is measured as having a large dispersion when the electromagnetic interference wave measurement is performed on many units of the same product.
One of the causes of the electromagnetic interference wave caused by the sliding contact failure of the latter is that the force of the coil spring that presses and urges the brush does not act vertically on the brush and the terminal body as a whole. There is. This is because when the force of the coil spring acts on the rotation direction of the commutator and the axial direction of the commutator, the eccentricity of the commutator, the unevenness of the commutator surface, the imbalance of the armature, the vibration of the armature and the entire motor, This is because the force of the coil spring is disturbed by friction when the brush and the commutator slide, and the contact between the brush and the commutator becomes unstable.
【０００３】電動工具は分解せずにブラシ装置の交換を
可能にするためにハウジングにブラシホルダが取付けら
れ、ブラシ装置をハウジング外部からブラシホルダに挿
入し、キャップをねじ込んで固定する構造のものが多
い。かかる構造のブラシ装置は、ブラシと、ブラシに可
撓性を有するリード線を介して電気的に接続される端子
体と、端子体とブラシとの間に装設されるコイルスプリ
ングとから構成されていた。ブラシ装置は、キャップを
ねじ込むときにキャップと端子体の摩擦で端子体もキャ
ップと一緒に回転してしまいリード線が捩じれ、リード
線長さが短くなったり、捩じり切れる等の障害が発生し
てしまう場合がある。上記した障害を避けるため、従来
では端子体に装着用爪を付加する、あるいはコイルスプ
リングの端子体側の端部を端子体に引っ掛ける等して端
子体がキャップと一緒に回転しないようにしていた。The electric tool has a structure in which a brush holder is attached to the housing in order to allow replacement of the brush device without disassembling, the brush device is inserted into the brush holder from outside the housing, and the cap is screwed and fixed. Many. The brush device having such a structure includes a brush, a terminal body electrically connected to the brush via a flexible lead wire, and a coil spring installed between the terminal body and the brush. Was there. In the brush device, when the cap is screwed in, the terminal body rotates together with the cap due to the friction between the cap and the terminal body, and the lead wire is twisted, and the lead wire length is shortened or broken. It may happen. In order to avoid the above-mentioned obstacle, conventionally, the terminal body is prevented from rotating together with the cap by adding a mounting claw to the terminal body or by hooking the terminal body side end of the coil spring on the terminal body.
【０００４】[0004]
【発明が解決しようとする課題】しかし上記した従来の
端子体に装着用爪を付加して端子体がキャップと一緒に
回転しないようにした構造では、装着用爪はブラシホル
ダに適正に装着しないと変形してしまうために、ブラシ
装置を装着するのに熟練を要し、自動装着が困難である
といった欠点があった。また、コイルスプリングの端子
体側の端部を端子体に引っ掛けた構造では、コイルスプ
リングの径方向のバネ圧力により端子体がキャップと一
緒に回転しないようになるが、コイルスプリングの端部
を端子体に引っ掛けられるように特別加工しなければな
らないと共にコイルスプリングの端部では全体に力が作
用するのではなく引っ掛け部分のみに力が作用してしま
うため、コイルスプリングの力を端子体全体に垂直に作
用させるのが困難となり、上記摺動接触不良に起因する
電磁妨害波のバラツキを大きくしてしまうといった欠点
があった。However, in the structure in which the mounting claw is added to the above-mentioned conventional terminal body so that the terminal body does not rotate together with the cap, the mounting claw is not properly mounted on the brush holder. Therefore, there is a drawback in that it requires skill to mount the brush device, and automatic mounting is difficult. Also, in the structure in which the end of the coil spring on the terminal body side is hooked on the terminal body, the terminal body will not rotate together with the cap due to the spring pressure in the radial direction of the coil spring, but the end of the coil spring will not rotate. The coil spring must be specially processed so that it does not act on the entire end of the coil spring, but only on the hooked part. It is difficult to make them act, and there is a drawback that the variation of the electromagnetic interference wave caused by the sliding contact failure is increased.
【０００５】更に、ブラシの断面は、整流子表面がブラ
シと接触する回転方向の幅の制約及びブラシの電流密度
の制約から整流子軸方向に長い長方形となっているた
め、コイルスプリングのブラシ側端部及び端子体側端部
がブラシ及び端子体に拘束されていない構造のブラシ装
置では、ブラシホルダに装着したときにコイルスプリン
グのブラシ側端部あるいは端子体側端部が整流子軸方向
にずれてしまい、コイルスプリングの力がブラシ及び端
子体に垂直に作用させるのが困難となるといった欠点が
あった。このため、コイルスプリングのブラシ側端部及
び端子体側端部をブラシ及び端子体に拘束させた構成と
すると、ブラシに横方向の力が働いたときにコイルスプ
リングにも同じ横方向の力が働き、コイルスプリングの
力を乱してブラシと整流子の摺動時における接触を不安
定にし、摺動接触不良に起因する電磁妨害波のバラツキ
を大きくしてしまうといった欠点があった。本発明の目
的は、上記欠点を解消し、容易に装着が行えると共に摺
動接触不良に起因する電磁妨害波のバラツキが少ないブ
ラシ装置を提供することである。Further, the cross section of the brush has a rectangular shape which is long in the axial direction of the commutator due to the restriction of the width of the commutator surface in the rotating direction in contact with the brush and the restriction of the current density of the brush. In a brush device having a structure in which the end portion and the end portion on the terminal body side are not restrained by the brush and the terminal body, the brush side end portion or the terminal body side end portion of the coil spring is displaced in the commutator axial direction when mounted on the brush holder. However, there is a drawback that it is difficult for the force of the coil spring to act vertically on the brush and the terminal body. Therefore, if the brush spring-side end and the terminal body-side end of the coil spring are constrained by the brush and the terminal body, when the lateral force acts on the brush, the same lateral force also acts on the coil spring. However, there is a drawback that the force of the coil spring is disturbed to make the contact between the brush and the commutator instable during sliding, and the variation of the electromagnetic interference wave caused by the poor sliding contact is increased. An object of the present invention is to solve the above-mentioned drawbacks and to provide a brush device that can be easily mounted and has less variation in electromagnetic interference waves due to poor sliding contact.
【０００６】[0006]
【課題を解決するための手段】上記目的は、端子体のブ
ラシ側にコイルスプリング内径より大きな凸部を設け、
凸部により径方向に広げてコイルスプリングを装設させ
ることにより達成される。また、ブラシの端子体側にコ
イルスプリング内径より小さな凸部を設け、コイルスプ
リングのブラシ側端部を緩やかに拘束するようにするこ
とにより達成される。The above object is to provide a convex portion larger than the inner diameter of the coil spring on the brush side of the terminal body,
This is achieved by spreading the coil spring in the radial direction by the convex portion and mounting the coil spring. Further, it is achieved by providing a convex portion smaller than the inner diameter of the coil spring on the terminal side of the brush and gently restraining the end portion of the coil spring on the brush side.
【０００７】[0007]
【発明の実施の形態】図１に本発明ブラシ装置の一実施
例を示す。図に示すようにブラシ１と端子体３は、可撓
性を有するリード線２で電気的に接続されており、コイ
ルスプリング４がブラシ１と端子体３との間に装設さ
れ、ブラシ１を図の下方向に押圧付勢している。コイル
スプリング４の端子体３側端部は、端子体３に設けられ
たコイルスプリング４内径より大きい凸部５により径方
向に広げられて装設され、端子体３に比較的強固に拘束
されている。また、コイルスプリング４のブラシ１側端
部は、ブラシ１に設けられた凸部６に装設されるが、凸
部６の径がコイルスプリング４の内径より小さいためブ
ラシ１に緩やかに拘束されている。更に、リード線２の
長さはコイルスプリング４の自由長より短くなってお
り、このためブラシ装置を図示しないブラシホルダに装
着する前でもコイルスプリング４はブラシ１を図の下方
向に押圧付勢している。コイルスプリング４は端子体３
側端部の拘束力と、ブラシ１側端部に生じるブラシ１と
の摩擦力によって、ブラシ１と端子体３との間にほぼ固
定された状態となっているので、ブラシ装置を図示しな
いハウジング外部からブラシホルダに挿入しキャップを
ねじ込んで固定する際にキャップと端子体３の摩擦力に
よって生じる端子体３に働く回転力は、コイルスプリン
グ４の径方向のバネ圧力により小さくなり、端子体３と
コイルスプリング４の回転は高々一回転程度に抑えられ
る。FIG. 1 shows an embodiment of the brush device of the present invention. As shown in the drawing, the brush 1 and the terminal body 3 are electrically connected by a flexible lead wire 2, and a coil spring 4 is installed between the brush 1 and the terminal body 3, Is pressed downward in the figure. The end portion of the coil spring 4 on the terminal body 3 side is provided so as to be expanded in the radial direction by the convex portion 5 provided on the terminal body 3 and larger than the inner diameter of the coil spring 4, and is relatively firmly restrained by the terminal body 3. There is. The end of the coil spring 4 on the brush 1 side is mounted on the protrusion 6 provided on the brush 1. However, since the diameter of the protrusion 6 is smaller than the inner diameter of the coil spring 4, the end is gently restrained by the brush 1. ing. Further, the length of the lead wire 2 is shorter than the free length of the coil spring 4, so that the coil spring 4 urges the brush 1 downward in the drawing even before the brush device is attached to the brush holder (not shown). doing. Coil spring 4 is terminal body 3
Since the brush 1 and the terminal body 3 are almost fixed by the restraining force of the side end portion and the frictional force between the brush 1 and the brush 1 end portion, the brush device is not shown in the housing. The rotational force acting on the terminal body 3 due to the frictional force between the cap and the terminal body 3 when the cap is screwed in from the outside and fixed by screwing, the rotational force acting on the terminal body 3 becomes small due to the spring pressure of the coil spring 4 in the radial direction. The rotation of the coil spring 4 is suppressed to about one rotation at most.
【０００８】上記したようにコイルスプリング４の端子
体３側端部が凸部５によって拘束されていると共にコイ
ルスプリング４のブラシ１側端部が凸部６に緩やかに拘
束されているので、ブラシ装置を図示しないブラシホル
ダに装着する際にコイルスプリング４の端子体３側端部
は横方向及び整流子軸方向に位置ずれを起こすことはな
く、コイルスプリング４のブラシ１側端部はわずかな範
囲内でしか位置ずれを起こさなくなり、コイルスプリン
グ４の力をブラシ１及び端子体３に垂直に作用させるこ
とが容易に行えるようになる。また、ブラシ装置をブラ
シホルダに装着後、ブラシ１に横方向の力が働いたとし
ても、コイルスプリング４のブラシ１側端部はブラシ１
に緩やかに拘束されているので、ブラシ１はコイルスプ
リング４から離れるように動き、コイルスプリング４に
直接横方向の力が働かず、コイルスプリング４の力の作
用を乱すことはない。以上の種々の効果の総合作用によ
り、ブラシ１と整流子の摺動時における接触が安定し、
摺動接触不良に起因する電磁妨害波が抑制できるので電
磁妨害波測定値のバラツキが少なくなる。また、従来の
ように装着に熟練を要する装着用爪等を必要としない構
成としたので、ブラシ装置の装着が容易になり、自動装
着も可能となる。As described above, since the end portion of the coil spring 4 on the terminal body 3 side is restrained by the convex portion 5 and the end portion of the coil spring 4 on the brush 1 side is gently restrained by the convex portion 6, the brush. When the device is mounted on a brush holder (not shown), the end of the coil spring 4 on the side of the terminal body 3 is not displaced in the lateral direction and the axial direction of the commutator, and the end of the coil spring 4 on the side of the brush 1 is slightly displaced. The positional deviation occurs only within the range, and the force of the coil spring 4 can be easily applied vertically to the brush 1 and the terminal body 3. In addition, even if a lateral force is applied to the brush 1 after the brush device is attached to the brush holder, the end portion of the coil spring 4 on the brush 1 side is the brush 1 side.
Since the brush 1 moves away from the coil spring 4, the lateral force is not directly exerted on the coil spring 4 and the effect of the force of the coil spring 4 is not disturbed. The combined action of the above various effects stabilizes the contact between the brush 1 and the commutator during sliding,
Since the electromagnetic interference wave caused by the sliding contact failure can be suppressed, the variation in the electromagnetic interference wave measurement value is reduced. Further, since the conventional construction does not require a mounting nail or the like that requires skill for mounting, it is easy to mount the brush device, and automatic mounting is also possible.
【０００９】図２に本発明ブラシ装置及び従来のブラシ
装置を用いた電動工具の電磁妨害波端子電圧の測定結果
を示す。図に示すａ及びｂは装着用爪を有するブラシ装
置を用いた電動工具の電磁妨害波端子電圧の測定結果で
あり、ｃ及びｄは図１に示した本発明ブラシ装置を用い
た電動工具の電磁妨害波端子電圧の測定結果である。ａ
及びｃは平均値、ｂ及びｄは非心ｔ分布による上側検定
の８０％の確率で８０％の製品がそれ以下になるレベル
を示す。なお非心ｔ分布による上側検定の８０％の確率
で８０％の製品がそれ以下になるレベルは、ＣＩＳＰＲ
１６の公報によって、計算したもので実験個数は各々３
台の結果である。FIG. 2 shows the measurement results of the electromagnetic interference terminal voltage of the electric tool using the brush device of the present invention and the conventional brush device. 1A and 1B show the measurement results of the electromagnetic interference terminal voltage of the electric power tool using the brush device having the mounting claw, and c and d of the electric power tool using the brush device of the present invention shown in FIG. It is the measurement result of the electromagnetic interference wave terminal voltage. a
And c are the mean values, and b and d are the levels at which 80% of the products are below 80% probability of the upper test by non-central t distribution. In addition, the level at which 80% of products have a probability of 80% or less in the upper test based on the non-central t distribution is CISPR.
Calculated according to 16 publications, and the number of experiments is 3 each
It is the result of the stand.
【００１０】測定結果は、図に示すように平均値ａ、ｃ
はほぼ同じだが、非心ｔ分布による上側検定の８０％の
確率で８０％の製品がそれ以下になるレベルｂ、ｄはｄ
の方が低い値となっており、従来のブラシ装置を用いた
電動工具に比べ、本発明ブラシ装置を用いた電動工具は
電磁妨害波のバラツキが少なくなっているのが分かる。As shown in the figure, the measurement results are average values a and c.
Are almost the same, but 80% of the probability of 80% of the products of the upper test by non-central t distribution is 80% or less
Is lower than that of the conventional electric power tool using the brush device, and the electric power tool using the brush device of the present invention has less variation in electromagnetic interference waves.
【００１１】[0011]
【発明の効果】上記したように本発明によれば、コイル
スプリングの端子体側の端部を拘束し、コイルスプリン
グのブラシ側の端部を緩やかに拘束した構成とすること
により、容易にブラシ装置の装着が行えるようになると
共に摺動接触不良に起因する電磁妨害波のバラツキを抑
制することができるようになる。As described above, according to the present invention, the end portion of the coil spring on the terminal body side is restrained, and the end portion of the coil spring on the brush side is gently restrained, whereby the brush device can be easily carried out. It becomes possible to mount the same, and it is possible to suppress the variation of the electromagnetic interference wave due to the poor sliding contact.
【図１】 本発明ブラシ装置の一実施例を示す断面図。FIG. 1 is a sectional view showing an embodiment of a brush device of the present invention.
【図２】 本発明ブラシ装置及び従来のブラシ装置を用
いた電動工具の電磁妨害波端子電圧の測定結果を示すグ
ラフ。FIG. 2 is a graph showing the measurement results of the electromagnetic interference terminal voltage of the electric power tool using the brush device of the present invention and the conventional brush device.
１はブラシ、２はリード線、３は端子体、４はコイルス
プリング、５は端子体に設けた凸部、６はブラシに設け
た凸部である。Reference numeral 1 is a brush, 2 is a lead wire, 3 is a terminal body, 4 is a coil spring, 5 is a convex portion provided on the terminal body, and 6 is a convex portion provided on the brush.
Claims (2)
ド線を介して電気的に接続される端子体と、端子体とブ
ラシとの間に装設されるコイルスプリングとを有するブ
ラシ装置において、 前記端子体のブラシ側にコイルスプリング内径より大き
な凸部を設け、凸部により径方向に広げてコイルスプリ
ングを装設させたことを特徴とするブラシ装置。1. A brush device having a brush, a terminal body electrically connected to the brush via a flexible lead wire, and a coil spring mounted between the terminal body and the brush. A brush device, wherein a convex portion larger than an inner diameter of a coil spring is provided on the brush side of the terminal body, and the coil spring is mounted by being radially extended by the convex portion.
り小さな凸部を設け、コイルスプリングのブラシ側の端
部を緩やかに拘束するようにしたことを特徴とする請求
項１記載のブラシ装置。2. The brush apparatus according to claim 1, wherein the brush is provided with a convex portion smaller than the inner diameter of the coil spring, and the end portion of the coil spring on the brush side is gently restrained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7306098A JPH09149583A (en) | 1995-11-24 | 1995-11-24 | Brush equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7306098A JPH09149583A (en) | 1995-11-24 | 1995-11-24 | Brush equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09149583A true JPH09149583A (en) | 1997-06-06 |
Family
ID=17953020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7306098A Pending JPH09149583A (en) | 1995-11-24 | 1995-11-24 | Brush equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09149583A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100471281B1 (en) * | 2002-11-22 | 2005-03-10 | 현대자동차주식회사 | Brush holder assembly of alternator |
| JP2014072940A (en) * | 2012-09-28 | 2014-04-21 | Hitachi Car Eng Co Ltd | Rotary electric machine |
| WO2024063013A1 (en) * | 2022-09-22 | 2024-03-28 | 日本精工株式会社 | Brush unit and connection device |
-
1995
- 1995-11-24 JP JP7306098A patent/JPH09149583A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100471281B1 (en) * | 2002-11-22 | 2005-03-10 | 현대자동차주식회사 | Brush holder assembly of alternator |
| JP2014072940A (en) * | 2012-09-28 | 2014-04-21 | Hitachi Car Eng Co Ltd | Rotary electric machine |
| WO2024063013A1 (en) * | 2022-09-22 | 2024-03-28 | 日本精工株式会社 | Brush unit and connection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20030610 |