JPH0813180B2 - Vehicle alternator - Google Patents
Vehicle alternatorInfo
- Publication number
- JPH0813180B2 JPH0813180B2 JP1141814A JP14181489A JPH0813180B2 JP H0813180 B2 JPH0813180 B2 JP H0813180B2 JP 1141814 A JP1141814 A JP 1141814A JP 14181489 A JP14181489 A JP 14181489A JP H0813180 B2 JPH0813180 B2 JP H0813180B2
- Authority
- JP
- Japan
- Prior art keywords
- suction hole
- iron core
- brackets
- radial length
- blade
- 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 Cooling System (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は自動車など車両の機関に用いられる交流発
電機に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an AC generator used in an engine of a vehicle such as an automobile.
第３図は従来の車両用交流発電機の断面図を示し、図
において、１はフロント側ブラケット、２はリヤ側ブラ
ケット、３は固定子で、固定子鉄心3aとこれに巻回され
た固定子コイル3bとからなる。1a,2aは上記両ブラケッ
ト1,2の端面にそれぞれ設けられた吸入孔、1b,2bは同じ
く両ブラケット1,2の外周部分に設けた吐出孔、20は上
記固定子鉄心3aの外周両端部に両ブラケット1,2の開口
縁を嵌合し上記鉄心3aを挟持固定するボルトである。６
はシャフトで、上記両ブラケット1,2に支持されたベア
リング4,5を介して回転自在に支承されている。7,8は上
記シャフト６に固定され上記固定子３の内側に位置する
磁極鉄心、7a,8aは磁極鉄心の磁極爪、９は上記磁極鉄
心7,8の内周に挟持された励磁コイル、30,40は磁極鉄心
7,8のそれぞれの端面に固定され、上記シャフト６の回
転に伴って回転する一対のファン、11はシャフト６に取
付けたスリップリング、12はシャフト６、磁極鉄心7,
8、励磁コイル９、ファン30,40、スリップリング11から
構成される回転子である。FIG. 3 is a cross-sectional view of a conventional vehicle alternator, in which 1 is a front bracket, 2 is a rear bracket, 3 is a stator, and a stator core 3a and a stator wound around the stator core 3a are shown. It consists of a child coil 3b. 1a and 2a are suction holes provided on the end surfaces of the brackets 1 and 2 respectively, 1b and 2b are discharge holes also provided on the outer peripheral portions of the brackets 1 and 2, and 20 are both outer peripheral end portions of the stator core 3a. Is a bolt that fits the opening edges of both brackets 1 and 2 to and holds and fixes the iron core 3a. 6
Is a shaft, which is rotatably supported by bearings 4 and 5 supported by the brackets 1 and 2. 7, 8 are magnetic pole cores fixed to the shaft 6 and located inside the stator 3, 7a, 8a are magnetic pole claws of the magnetic pole cores, 9 is an exciting coil sandwiched between the inner circumferences of the magnetic pole cores 7, 8. 30,40 are magnetic pole cores
A pair of fans fixed to the respective end faces of 7, 8 and rotating with the rotation of the shaft 6, 11 a slip ring attached to the shaft 6, 12 a shaft 6, a magnetic pole core 7,
The rotor includes 8, an exciting coil 9, fans 30, 40, and a slip ring 11.
13は上記スリップリング11に摺接するブラシ13aを内
部に収容した給電用の集電装置、14はブラシ13aからス
リップリング11を介して励磁コイル９に励磁電流が供給
され、該励磁コイル９および上記磁極鉄心7,8が図示し
ない機関によってプーリ15を介して回転されることで、
固定子コイル3bに誘起された交流電流を整流して直流電
流に変換する整流器、14aはこの整流器14で発生する熱
を放熱するヒートシンク、16は発電機電圧を検出し励磁
電流を制御し、端子電圧を調整する電圧調整器であっ
て、16aはこの調整器16のヒートシンクである。なお、
図中L0は上記ファン30の羽根30a〜30eの径方向長さ、L1
は羽根30a〜30eと吸入孔1aが重なる部分の径方向長さで
ある。また、第４図に上記フロント側ブラケット１の吸
入孔1aとファン30との位置関係を示す交流発電機の側面
図を示す。Reference numeral 13 denotes a current collector for power supply which accommodates a brush 13a slidably contacting the slip ring 11 therein, and 14 an exciting current is supplied from the brush 13a to the exciting coil 9 through the slip ring 11 so that the exciting coil 9 and the above When the magnetic pole cores 7 and 8 are rotated via the pulley 15 by an unillustrated engine,
A rectifier that rectifies the alternating current induced in the stator coil 3b and converts it into a direct current, 14a is a heat sink that radiates the heat generated in this rectifier 14, 16 is a generator voltage and controls the exciting current, and the terminal A voltage regulator that regulates the voltage, and 16a is a heat sink of the regulator 16. In addition,
In the figure, L 0 is the radial length of the blades 30a to 30e of the fan 30, L 1
Is the radial length of the portion where the blades 30a to 30e and the suction hole 1a overlap. FIG. 4 is a side view of the AC generator showing the positional relationship between the suction holes 1a of the front bracket 1 and the fan 30.
次に従来の交流発電機の動作について説明する。ファ
ン30,40が回転することによって冷却風がフロント側ブ
ラケット１の吸入孔1aから矢印ａのように流入し、ベア
リング４、磁極鉄心７、励磁コイル９、固定子鉄心3aお
よび固定子コイル3bを冷却し、吐出孔1bから外部へ排出
される。同じように冷却風はリヤ側ブラケット２の吸入
孔2aから矢印ｂのように流入し、ベアリング５、電圧調
整器16、整流器14、磁極鉄心８、励磁コイル９、固定子
鉄心3a、固定子コイル3bを冷却し吐出孔2bから外部へ排
出される。Next, the operation of the conventional AC generator will be described. As the fans 30 and 40 rotate, cooling air flows in from the intake hole 1a of the front bracket 1 as shown by the arrow a, and the bearing 4, the magnetic pole core 7, the exciting coil 9, the stator core 3a and the stator coil 3b are connected. It is cooled and discharged from the discharge hole 1b to the outside. Similarly, the cooling air flows in from the intake hole 2a of the rear bracket 2 as shown by the arrow b, and the bearing 5, the voltage regulator 16, the rectifier 14, the magnetic pole core 8, the exciting coil 9, the stator core 3a, and the stator coil. 3b is cooled and discharged from the discharge hole 2b to the outside.
従来の車両用交流発電機は以上のように構成されてい
るので、第３図に示したようにファン30の羽根30a〜30e
と吸入孔1aが重なる部分の径方向長さL1が該羽根の径方
向長さL0のほぼ80％以上を占めており、ファン30が回転
することで上記径方向長さL1の部分が吸入孔1aを周方向
に断続的に横切ることになり、結果的に回転周波数の羽
根の枚数倍の周波数と回転周波数の吸入孔1aの個数倍の
周波数、すなわち、第４図でいえば第10次および第12次
の周波数の風騒音の音圧が顕著となり、耳障りでかつ、
オーバオールの音圧レベル値も引上がる主原因となって
いた。Since the conventional vehicle alternator is configured as described above, as shown in FIG. 3, the blades 30a to 30e of the fan 30 are shown.
The radial length L 1 of the portion where the suction hole 1a overlaps with the suction hole 1a occupies approximately 80% or more of the radial length L 0 of the blade, and the fan 30 rotates to cause the radial length L 1 Will intermittently traverse the suction hole 1a in the circumferential direction, and as a result, a frequency which is a multiple of the number of blades of the rotation frequency and a frequency which is a multiple of the number of the suction holes 1a of the rotation frequency, that is, in FIG. The sound pressure of the wind noise of the 10th and 12th frequencies becomes remarkable, and it is jarring and
It was also the main reason for the increase in overall sound pressure level.
この発明は上記のような課題を解消するためになされ
たもので、風騒音の音圧レベルのオーバーオール値を低
減でき、しかもそれに占めるファンの羽根の枚数倍の周
波数と吸入孔の個数倍の周波数の音圧レベル値を低減
し、耳障り感を解消できる車両用交流発電機を得ること
を目的とする。The present invention has been made to solve the above problems, and can reduce the overall value of the sound pressure level of wind noise, and further, the frequency of the number of fan blades and the number of suction holes that are occupied by the overall value. It is an object of the present invention to obtain a vehicular AC generator that can reduce the sound pressure level value of and reduce the discomfort.
この発明に係わる車両用交流発電機は、シャフトに固
着され励磁コイルにより励磁される磁極鉄心と、この磁
極鉄心を囲い固定子コイルを装着した固定子鉄心と、固
定子鉄心を保持し、かつベアリングを介して上記シャフ
トを支承するフロント側ブラケットおよびリヤ側ブラケ
ットと、この両ブラケットの軸方向端面にそれぞれ設け
られた冷却風の吸入孔と、上記両ブラケットの外周面に
それぞれ設けられた排気の吐出孔と、上記磁極鉄心の両
端面に取付けられ上記吸入孔から両ブラケット内に冷却
風を導入させる一対のファンとを備えた車両用交流発電
機において、上記ファンの羽根の吸入孔側端部と吸入孔
が重なる部分の径方向長さが上記吸入孔側端部の径方向
長さの50％以下になるようにするとともに、羽根の吸入
孔側端部の内径側角部に、径方向長さの30％以上の半径
長さの丸み半径を形成したものである。The vehicle alternator according to the present invention includes a magnetic pole iron core fixed to a shaft and excited by an exciting coil, a stator iron core surrounding the magnetic pole iron core and having a stator coil attached thereto, and a stator iron core and a bearing. Front bracket and rear bracket that support the shaft via the above-mentioned shafts, cooling air intake holes provided on the axial end faces of both brackets, and exhaust gas discharge provided on the outer peripheral surfaces of both brackets. A vehicular AC generator comprising a hole and a pair of fans attached to both end faces of the magnetic pole core for introducing cooling air into the brackets from the suction hole, the suction hole side end of the fan blade. The radial length of the portion where the suction holes overlap is 50% or less of the radial length of the suction hole side end, and the inner diameter side angle of the suction hole side end of the blade To, and forming a rounding radius of more than 30% of the radius length of the radial length.
この発明においては、上記のように構成したので、風
騒音の構成周波数のうち、回転周波数の羽根の枚数倍の
周波数と回転周波数の吸入孔の個数倍の周波数、すなわ
ち第10次および第12次の周波数の音圧レベルを低減でき
る作用が得られる。According to the present invention, since the configuration is as described above, among the constituent frequencies of wind noise, the frequency is the number of times the number of blades of the rotational frequency and the frequency of the number of the suction holes of the rotational frequency, that is, the tenth order and the twelfth order. The effect of reducing the sound pressure level at the frequency is obtained.
以下、この発明の一実施例を図について説明する。第
１図はこの発明による車両用交流発電機の断面図、第２
図はフロント側ブラケットの吸入孔とファンとの関係を
示す側面図である。図において、31は従来例のファン30
に代わるファンであって、31a〜31eはファン31を構成す
る羽根を示す。L0は上記ファン31の羽根31a〜31eの吸入
孔1a側端部の径方向長さ、L1は吸入孔1aと羽根31a〜31e
が対向して重なっている羽根端部の径方向長さ、ｒは羽
根の吸入孔側端部の内径側角部の丸み半径である。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an automotive alternator according to the present invention, and FIG.
The figure is a side view showing the relationship between the suction holes of the front bracket and the fan. In the figure, 31 is a conventional fan 30.
31a to 31e are blades that constitute the fan 31. L 0 is the radial length of the end of the blades 31a to 31e of the fan 31 on the suction hole 1a side, and L 1 is the suction hole 1a and the blades 31a to 31e.
Is a radial length of the blade end portions overlapping with each other, and r is a rounding radius of an inner diameter side corner portion of the suction hole side end portion of the blade.
ここで、上記L1はL0に対して50％以下になるように上
記吸入孔1aの外径φＤを小さくしたり、または羽根31a
〜31eの根元内径よりも該羽根の吸入孔側端部の内径を
大きくしてあり、さらに羽根の吸入孔側端部の内径側角
部に、径方向長さL0の30％以上の半径長さの丸み半径ｒ
を設けてある。また吸入孔1aの面積を補完するため、第
２図に示すようにブラケット１に第２の吸入孔1cを設け
てある。なお、第１図および第２図においてその他の各
符号は第３図および第４図に示した従来例のものと同一
であるので同一符号を付して説明は省略する。Here, the outer diameter φD of the suction hole 1a is reduced so that L 1 is 50% or less of L 0 , or the blade 31a
The inner diameter of the suction hole side end of the blade is larger than the root inner diameter of ~ 31e, and the radius of 30% or more of the radial length L 0 is set at the inner diameter side corner of the blade suction hole side end. Roundness of length r
Is provided. Further, in order to complement the area of the suction hole 1a, the bracket 1 is provided with a second suction hole 1c as shown in FIG. Note that, in FIGS. 1 and 2, the other reference numerals are the same as those of the conventional example shown in FIGS.
上記のようにこの発明では、上記L1をL0の50％以下と
したことによって風騒音の構成周波数のうち、回転周波
数の羽根の枚数倍の周波数と回転周波数の吸入孔の個数
倍の周波数、すなわち第10次および第12次の周波数の音
圧レベルを低減することができる。As described above, according to the present invention, by setting L 1 to 50% or less of L 0 , among the constituent frequencies of wind noise, the frequency that is twice the number of blades at the rotation frequency and the frequency that is twice the number of suction holes at the rotation frequency. That is, it is possible to reduce the sound pressure levels of the 10th and 12th frequencies.
また、羽根の吸入孔側端部の内径側角部に径方向長さ
L0の30％以上の半径長さの丸み半径ｒを設けてあるので
第10次および第12次の周波数の音圧レベルをさらに低減
できる。即ち、ここで吸入孔1aと羽根31a〜31eが重なら
ないようにすれば、吸入孔を羽根が回転して横切ること
もなく、従って、吸入の個数倍の周波数の騒音も著しく
低下するわけであるが、それを行なった場合、羽根長さ
を充分に確保できなくなり、ファン特性の低下による風
量減、さらには機械的強度も確保できなくなるという結
果になる。Also, the radial length at the corner of the blade on the inner diameter side at the suction hole side end
Since the round radius r having a radius length of 30% or more of L 0 is provided, the sound pressure level at the 10th and 12th frequencies can be further reduced. That is, if the suction hole 1a and the blades 31a to 31e are not overlapped with each other here, the blade does not rotate and cross the suction hole, and therefore the noise of the frequency that is several times the suction frequency is significantly reduced. However, when this is done, the blade length cannot be sufficiently secured, resulting in a reduction in the air flow due to the deterioration of the fan characteristics, and it is also impossible to secure the mechanical strength.
そこで、機械的強度も確保し、かつ吸入孔との風切音
を低下させる目的で、羽根の内径側角部に丸みを設けた
ものであり、丸みを設けることにより、吸入孔とのギャ
ップが実質増加することにより、効果が出るものであ
る。そしてまた、第５図のグラフに示されるように、こ
の角部のＲをL0の30％以上の半径長さの丸みとすること
で、必要な風量を確保しつつ、しかも音圧低減効果が飛
躍的に増大するものとなる。Therefore, in order to secure mechanical strength and reduce wind noise with the suction hole, the blade is provided with rounded corners on the inner diameter side. The effect is brought about by the substantial increase. Also, as shown in the graph of FIG. 5, by making R of this corner rounded with a radius length of 30% or more of L 0 , the necessary sound volume can be ensured and the sound pressure can be reduced. Will increase dramatically.
以上説明したようにこの発明によれば、ファンの羽根
の吸入孔側端部と吸入孔が重なる部分の径方向長さが上
記吸入孔側端部の径方向長さの50％以下にするととも
に、羽根の吸入側端部の内径側角部に、径方向の30％以
上の半径長さの丸み半径を形成したので、風騒音の音圧
レベルのオーバーオール値を低減でき、低騒音で耳障り
な音を抑制できる車両用発電機となる。As described above, according to the present invention, the radial length of the portion where the suction hole side end of the fan blade overlaps the suction hole is 50% or less of the radial length of the suction hole side end. Since a rounded radius with a radial length of 30% or more in the radial direction is formed at the inner diameter side corner of the suction side end of the blade, the overall value of the sound pressure level of wind noise can be reduced, and it is low noise and harsh. It becomes a vehicle generator that can suppress sound.
第１図はこの発明の一実施例による車両用交流発電機の
断面図、第２図は同じくブラケット吸入孔とファンとの
位置関係を示す側面図、第３図は従来の車両用交流発電
機の断面図、第４図は従来のブラケット吸入孔とファン
との位置関係の側面図、第５図は角部Ｒの大きさと風
音、風量の関係を示すグラフである。 １…フロント側ブラケット、1a…吸入孔、1b…吐出孔、
２…リヤ側ブラケット、2a…吸入孔、2b…吐出孔、３…
固定子、3a…固定子鉄心、3b…固定子コイル、4,5…ベ
アリング、６…シャフト、7,8…磁極鉄心、９…励磁コ
イル、31…ファン、31a〜31e…羽根。 なお、図中同一符号は同一又は相当部分を示す。FIG. 1 is a sectional view of an automotive alternator according to an embodiment of the present invention, FIG. 2 is a side view showing a positional relationship between a bracket suction hole and a fan, and FIG. 3 is a conventional alternator for vehicle. FIG. 4 is a side view of the positional relationship between the conventional bracket suction hole and the fan, and FIG. 5 is a graph showing the relationship between the size of the corner R and the wind noise and air volume. 1 ... Front bracket, 1a ... Suction hole, 1b ... Discharge hole,
2 ... Rear bracket, 2a ... Suction hole, 2b ... Discharge hole, 3 ...
Stator, 3a ... Stator core, 3b ... Stator coil, 4,5 ... Bearing, 6 ... Shaft, 7,8 ... Magnetic pole core, 9 ... Excitation coil, 31 ... Fan, 31a-31e ... Blade. The same reference numerals in the drawings indicate the same or corresponding parts.
Claims (1)
される磁極鉄心と、この磁極鉄心を囲い固定子コイルを
装着した固定子鉄心と、この固定子鉄心を保持し、かつ
ベアリングを介して上記シャフトを支承するフロント側
ブラケットおよびリヤ側ブラケットと、この両ブラケッ
トの軸方向端面にそれぞれ設けられた冷却風の吸入孔
と、上記両ブラケットの外周面にそれぞれ設けられた排
気の吐出孔と、上記磁極鉄心の両端面に取付けられ上記
吸入孔から両ブラケット内に冷却風を導入させる一対の
ファンとを備えた車両用交流発電機において、上記ファ
ンの羽根の吸入孔側端部と吸入孔が重なる部分の径方向
長さが上記吸入孔側端部の径方向長さの50％以下に設定
するとともに、羽根の吸入孔側端部の内径側角部に、径
方向長さの30％以上の半径長さの丸み半径を設けたこと
を特徴とする車両用交流発電機。1. A magnetic pole iron core fixed to a shaft and excited by an exciting coil, a stator iron core surrounding the magnetic pole iron core and having a stator coil attached thereto, and the shaft which holds the stator iron core and through a bearing. The front side bracket and the rear side bracket for supporting the brackets, the cooling air intake holes respectively provided on the axial end surfaces of the both brackets, the exhaust gas discharge holes respectively provided on the outer peripheral surfaces of the both brackets, and the magnetic poles. In a vehicle alternator equipped with a pair of fans mounted on both end faces of an iron core to introduce cooling air into the brackets from the suction holes, a portion where the suction hole side ends of the fan blades overlap the suction holes. The radial length of the blade is set to 50% or less of the radial length of the suction hole side end, and at the inner diameter side corner of the suction hole side end of the blade is 30% or more of the radial length. An alternator for vehicles, characterized by having a rounded radius of radius length.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1141814A JPH0813180B2 (en) | 1989-06-02 | 1989-06-02 | Vehicle alternator |
| US07/531,274 US5028826A (en) | 1989-06-02 | 1990-05-31 | Fan arrangement for a vehicular AC generator |
| EP90305989A EP0401034B1 (en) | 1989-06-02 | 1990-06-01 | Fan arrangement for a vehicular AC generator |
| DE69005530T DE69005530T2 (en) | 1989-06-02 | 1990-06-01 | Fan assembly for AC vehicle generator. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1141814A JPH0813180B2 (en) | 1989-06-02 | 1989-06-02 | Vehicle alternator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH037039A JPH037039A (en) | 1991-01-14 |
| JPH0813180B2 true JPH0813180B2 (en) | 1996-02-07 |
Family
ID=15300751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1141814A Expired - Lifetime JPH0813180B2 (en) | 1989-06-02 | 1989-06-02 | Vehicle alternator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0813180B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022127849A (en) * | 2021-02-22 | 2022-09-01 | 三菱電機株式会社 | Rotary electric machine |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2998441B2 (en) * | 1992-08-19 | 2000-01-11 | 株式会社日立製作所 | Turbo vacuum pump |
| JPH0886298A (en) * | 1994-09-19 | 1996-04-02 | Hitachi Ltd | Dry turbo vacuum pump |
| FR2869477B1 (en) * | 2004-03-26 | 2007-07-27 | Valeo Equip Electr Moteur | ROTATING ELECTRICAL MACHINE, IN PARTICULAR ALTERNATOR FOR A MOTOR VEHICLE, WHOSE AIR INPUTS / OUTPUTS INCLUDE INCLINED FINS WITH RESPECT TO THE BLADES OF THE FANS |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61121741A (en) * | 1984-11-14 | 1986-06-09 | Nippon Denso Co Ltd | Rotor for ac generator for vehicle |
-
1989
- 1989-06-02 JP JP1141814A patent/JPH0813180B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022127849A (en) * | 2021-02-22 | 2022-09-01 | 三菱電機株式会社 | Rotary electric machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH037039A (en) | 1991-01-14 |
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