JPH0732570B2 - Brush holding device - Google Patents
Brush holding deviceInfo
- Publication number
- JPH0732570B2 JPH0732570B2 JP62249830A JP24983087A JPH0732570B2 JP H0732570 B2 JPH0732570 B2 JP H0732570B2 JP 62249830 A JP62249830 A JP 62249830A JP 24983087 A JP24983087 A JP 24983087A JP H0732570 B2 JPH0732570 B2 JP H0732570B2
- Authority
- JP
- Japan
- Prior art keywords
- brush
- brush holder
- holding device
- bracket
- heat
- 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.)
- Expired - Lifetime
Links
Landscapes
- Motor Or Generator Frames (AREA)
- Motor Or Generator Current Collectors (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はブラシ保持装置に係り、特に内燃機関始動用電
動機等に好適なブラシ保持装置に関する。Description: TECHNICAL FIELD The present invention relates to a brush holding device, and more particularly to a brush holding device suitable for an electric motor for starting an internal combustion engine and the like.
従来のブラシ保持装置は、実開昭60−733720号等に記載
のようにブラシホルダー取付板にねじ穴を設けこのねじ
穴を利用してブラケットにブラシホルダー部を取付けて
いた。In the conventional brush holding device, as described in Japanese Utility Model Laid-Open No. 60-733720, a brush holder mounting plate is provided with a screw hole, and the brush holder is attached to the bracket using the screw hole.
しかし、前記取付板をセラミックスにするとねじ穴を設
けることができず、ブラケット側にねじ締めすることに
なり生産性が劣りブラシホルダー部を容易に成形するこ
とについては配慮されていなかった。However, if the mounting plate is made of ceramics, a screw hole cannot be provided, and the bracket is screwed to reduce the productivity, and no consideration has been given to easily molding the brush holder portion.
上記技術は、（＋）ブラシホルダーをブラシホルダープ
レートから絶縁する必要が有ることから例えばフェノー
ル樹脂積層板に一旦ブラシホルダーを固定した後、更に
ブラシホルダープレートに固定していたため、電動機の
運転時ブラシの発熱が熱伝導率の低い絶縁板を伝わって
放熱されるため冷却効果が悪く温度上昇の原因となり、
小形化に於てブラシの電流密度向上には問題があった。
又、ブラシ押圧用ばねを必要とするため、ブラシホルダ
ーにはそのばねを支持固定するための部材を必要とし、
機械強度の高い金属板が一般的に用いられていた。In the above technique, since it is necessary to insulate the (+) brush holder from the brush holder plate, for example, the brush holder is once fixed to the phenol resin laminated plate, and then fixed to the brush holder plate. The heat generated by the heat is dissipated through the insulating plate with low thermal conductivity, and the cooling effect is poor, causing a rise in temperature.
There was a problem in improving the current density of the brush in miniaturization.
Also, since a brush pressing spring is required, a member for supporting and fixing the spring is required for the brush holder,
A metal plate having high mechanical strength was generally used.
本発明の目的は電動機の小形化に於てブラシへの通電時
の発熱を効率良く放熱できるブラシホルダー部を備えた
ブラシ保持装置を提供するにある。An object of the present invention is to provide a brush holding device provided with a brush holder part capable of efficiently dissipating heat generated when a brush is energized in miniaturizing an electric motor.
上記目的を達成するため、ブラシホルダー取付基板にフ
エノール樹脂積層板に比較し熱伝導率が２〜３桁優れた
電気絶縁性のセラミックス基板を用いてブラシホルダー
部と放熱フィンを一体に成形し、この成形体のブラシホ
ルダー部にうず巻ばねの支持柱を必要としない凹部を設
け、該凹部に定荷重ばねを配置し、そして該ブラシホル
ダー取付基板にブラケットとの取付部を設け、それを機
械的強度の高い導伝基板からなる固定基板に接合し、こ
の状態で両者をブラケットに固定するように構成した。In order to achieve the above object, the brush holder mounting board is integrally molded with a brush holder part and a radiation fin by using an electrically insulating ceramic board having a thermal conductivity superior to that of a phenol resin laminated plate by 2 to 3 digits, The brush holder portion of this molded body is provided with a concave portion which does not require a support column for the spiral spring, the constant force spring is arranged in the concave portion, and the brush holder mounting board is provided with a bracket mounting portion. It is configured to be joined to a fixed substrate made of a conductive substrate having high dynamic strength, and to fix the both to a bracket in this state.
ブラシ保持装置はブラシの保持と、ブラシ発熱による変
形，燒損防止が必要である。The brush holding device is required to hold the brush and prevent deformation and scorching due to heat generation of the brush.
そこでセラミックス成形品のブラシホルダー取付基板ば
耐熱性，熱伝導率が樹脂成形品に比較し高いため、放熱
性が良く発熱部の放熱が冷却フィンを介して効果的に行
われ、ブラシの電流密度を向上させる。Therefore, the heat resistance and thermal conductivity of the ceramic holder brush holder mounting board are higher than that of the resin molded article, so the heat dissipation is good and the heat dissipation of the heat generating part is performed effectively through the cooling fins. Improve.
また、ブラシばねは支持柱を必要としない定荷重ばねで
ブラシホルダー部の凹部に挿入されていて、ブラシを押
圧するためのばね反力をブラシに与える。The brush spring is a constant force spring that does not require a supporting column and is inserted into the recess of the brush holder to apply a spring reaction force for pressing the brush to the brush.
以下、本発明の一実施例を第１図〜第３図により説明す
る。１は内周面に界磁極２を備えたヨークで、３は整流
子４を有する電機子、５は前記ヨークと嵌合する椀状の
ブラケットで、その内側面には熱伝導率が0.03〜0.3cal
/cm,s,℃程度のセラミックス成形品、例えば材質がAlN,
BeO,SiO等から成るブラシホルダー取付基板６が導電
性，耐伝導率及び機械的強度の高い例えばセラミックス
又は鋼板から成る固定基板７を介してネジ８により締付
固定されている。尚、前記２枚の基板は取付前に予め接
着固定する。又、ブラシホルダー部９は（＋）ブラシ1
0,（−）ブラシ11を挿入する穴12及び定荷重うず巻ばね
13,13aを収納する凹部1,14aを備え、該うず巻ばね13,13
aの芯部は前記凹部14,14aに支持部材なしに可動自在に
挿入されている。従って、うず巻ばねは凹部14,14aの壁
面を摺動しこの圧力でブラシを整流子４に押圧してい
る。15は固定基板７に設けたねじ穴で前記ブラシホルダ
ー取付基板６をブラケット５にねじ８によって締付固定
している。16は放射線上に形成された放熱フィンで、前
記ブラシホルダー部9,9a間に間隔をおいて複数個設けら
れている。尚前記（−）ブラシ11のピグテール17は固定
基板７に電気的に接合されている。An embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 is a yoke having field poles 2 on its inner peripheral surface, 3 is an armature having a commutator 4, and 5 is a bowl-shaped bracket that fits with the yoke. The inner surface thereof has a thermal conductivity of 0.03 to 0.3cal
/ cm, s, ℃ about ceramics molded products, for example, the material is AlN,
A brush holder mounting substrate 6 made of BeO, SiO or the like is fixed by screws 8 with a fixing substrate 7 made of, for example, ceramics or a steel plate having high conductivity, conductivity and mechanical strength. The two substrates are bonded and fixed in advance before mounting. In addition, the brush holder 9 is a (+) brush 1
0, (-) Hole 12 for inserting brush 11 and constant load spiral spring
The spiral springs 13, 13 are provided with concave portions 1, 14a for accommodating the 13, 13a.
The core portion of a is movably inserted into the recesses 14 and 14a without a supporting member. Therefore, the spiral spring slides on the wall surfaces of the recesses 14 and 14a and presses the brush against the commutator 4 by this pressure. Reference numeral 15 is a screw hole provided in the fixed substrate 7 for fixing the brush holder mounting substrate 6 to the bracket 5 with a screw 8. Reference numeral 16 is a radiation fin formed on the radiation, and a plurality of fins are provided at intervals between the brush holder portions 9 and 9a. The pigtail 17 of the (-) brush 11 is electrically joined to the fixed substrate 7.
上記構成において、電動機の（＋）側ブラシ10に通電す
ると整流子から電機子コイル3aを通り再び整流子４に戻
り（−）ブラシ11からピグテール17を通りブラケット５
からアース電流が流れることにより電動機は回転する。In the above structure, when the (+) side brush 10 of the electric motor is energized, it returns from the commutator to the armature coil 3a and returns to the commutator 4 again. From the (-) brush 11 to the pigtail 17 and the bracket 5
The motor rotates by the ground current flowing from the motor.
この通電によってブラシ10,11及び整流子４は発熱する
が、この発熱は熱伝導率の優れたブラシホルダー部９及
びブラシホルダー取付基板6,放熱フィン16,固定基板7,
ブラケット５を伝わって外部に効率良く放熱されるため
温度上昇を低く抑えることができる。従ってその分ブラ
シの電流密度とを増しても従来の温度上昇以下に抑える
ことができる。従ってブラシの小形化が可能となる。This energization causes the brushes 10 and 11 and the commutator 4 to generate heat, but this heat generation causes the brush holder 9 and the brush holder mounting board 6, the radiation fins 16, the fixed board 7 and the excellent heat conductivity to be generated.
Since the heat is efficiently radiated to the outside through the bracket 5, the temperature rise can be suppressed to a low level. Therefore, even if the current density of the brush is increased by that amount, it is possible to suppress the temperature rise to or below the conventional temperature rise. Therefore, the size of the brush can be reduced.
又、ブラシばねの支持は支柱を設けることがなくとも、
たわみ量に関係なくいつも一定の荷重が得られる定荷重
発生のうず巻ばねで、ブラシホルダーの部材は高い機械
的強度をを必要とせずセラミックス化を可能とした。Also, the support of the brush spring does not have to be provided with a column,
This is a spiral spring that generates a constant load regardless of the amount of deflection, and the brush holder member does not require high mechanical strength and can be made into ceramics.
更にはブラケットとブラシ取付基板を広い放熱面積でも
って固定できるためブラシ部の温度上昇を抑えるのに有
効であり、加えてセラミックスは不燃物であり、耐熱性
が従来と比較できない程向上する利点がある。Furthermore, since the bracket and the brush mounting board can be fixed with a large heat radiation area, it is effective in suppressing the temperature rise of the brush part. In addition, ceramics are non-combustible, and there is an advantage that heat resistance is improved beyond comparison with conventional ones. is there.
本発明の実測例ではブラシの電流密度を270A/cm2から39
0A/cm2に増してもブラシ部の温度上昇は従来と同等以下
に抑えることができ、ブラシの軸長を約30％短縮するこ
とが可能となり小形・軽量化に効果があった。In the actual measurement example of the present invention, the brush current density was changed from 270 A / cm 2 to 39
Even if it is increased to 0 A / cm 2 , the temperature rise of the brush part can be suppressed to the same level as before or less, and the axial length of the brush can be shortened by about 30%, which was effective in reducing the size and weight.
以上発明によれば、放熱性の優れたブラシ保持装置が簡
単な構成にて提供される。According to the above invention, a brush holding device having excellent heat dissipation is provided with a simple configuration.
第１図は本発明の一実施例を示す電動機要部の半横断面
図、第２図は第１図の一部縦断面図、第３図はブラシ保
持装置の斜視図である。 ５……ブラケット、６……ブラシホルダー取付基板、７
……固定基板、9,9a……ブラシホルダー部、10,11……
ブラシ、12……ブラシ挿入穴、13,13a……うず巻ばね、
14,14a……凹部。FIG. 1 is a semi-transverse sectional view of an essential part of an electric motor showing an embodiment of the present invention, FIG. 2 is a partial longitudinal sectional view of FIG. 1, and FIG. 3 is a perspective view of a brush holding device. 5 …… Bracket, 6 …… Brush holder mounting board, 7
...... Fixed substrate, 9,9a ...... Brush holder part, 10,11 ......
Brush, 12 …… Brush insertion hole, 13,13a …… Spiral spring,
14,14a …… Concave.
Claims (1)
の側面にブラシホルダー部を形成したブラシホルダー取
付基板と、 前記ブラシホルダー部に挿入さればね力により半径方向
内側に押圧されるブラシとを備えたブラシ保持装置であ
って、 前記ブラシホルダー取付け基板は、ブラシホルダー部と
放熱フィンを一体に成形した円板状のセラミック成形体
からなり、 前記放熱フィンは、前記ブラシホルダー部間の放射線上
に間隔をおいて複数個配列されてなり、 前記ブラシホルダー部は、渦巻ばねを挿入配置する凹部
を備えてなり、 前記ブラシホルダー取付け基板は、導電性に優れ熱伝性
の高い材料からなる固定基板を介して前記ブラケットの
内側面に固定されていることを特徴としたブラシ保持装
置。1. A brush holder mounting substrate fixed to an inner surface of a bracket and having a brush holder portion formed on one side surface, and a brush which is inserted into the brush holder portion and is pressed radially inward by a spring force. In the brush holding device, the brush holder mounting substrate is formed of a disk-shaped ceramic molded body in which a brush holder portion and a heat radiation fin are integrally molded, and the heat radiation fin is provided on the radiation between the brush holder portions. The brush holder part is provided with a recess into which the spiral spring is inserted and arranged, and the brush holder mounting substrate is made of a material having excellent conductivity and high heat conductivity. A brush holding device fixed to the inner surface of the bracket via a substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62249830A JPH0732570B2 (en) | 1987-10-05 | 1987-10-05 | Brush holding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62249830A JPH0732570B2 (en) | 1987-10-05 | 1987-10-05 | Brush holding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0197151A JPH0197151A (en) | 1989-04-14 |
| JPH0732570B2 true JPH0732570B2 (en) | 1995-04-10 |
Family
ID=17198821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62249830A Expired - Lifetime JPH0732570B2 (en) | 1987-10-05 | 1987-10-05 | Brush holding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0732570B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2764132B1 (en) * | 1997-05-30 | 1999-08-20 | Valeo Systemes Dessuyage | CAGE FOR ELECTRIC MOTOR BRUSH WITH COOLING FINS |
| JP2023037039A (en) * | 2020-02-12 | 2023-03-15 | パナソニックＩｐマネジメント株式会社 | Electric motor, and electric blower |
| CN115764474A (en) * | 2022-12-14 | 2023-03-07 | 沧州宇航电机电气有限公司 | Brush holder with punching and riveting structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59129371U (en) * | 1983-02-16 | 1984-08-30 | 三菱電機株式会社 | Brush holder for rotating electrical machinery |
| JPS62122444U (en) * | 1986-01-24 | 1987-08-04 |
-
1987
- 1987-10-05 JP JP62249830A patent/JPH0732570B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0197151A (en) | 1989-04-14 |
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