JP4630681B2 - Electric blower - Google Patents

Electric blower Download PDF

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Publication number
JP4630681B2
JP4630681B2 JP2005029102A JP2005029102A JP4630681B2 JP 4630681 B2 JP4630681 B2 JP 4630681B2 JP 2005029102 A JP2005029102 A JP 2005029102A JP 2005029102 A JP2005029102 A JP 2005029102A JP 4630681 B2 JP4630681 B2 JP 4630681B2
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Japan
Prior art keywords
mounting portion
bearing mounting
synthetic resin
frame member
outer ring
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JP2005029102A
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JP2006217751A (en
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順基 三好
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Toshiba Corp
Toshiba Lifestyle Products and Services Corp
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Toshiba Corp
Toshiba Consumer Electronics Holdings Corp
Toshiba Home Appliances Corp
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    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings
    • F16C25/08—Ball or roller bearings self-adjusting
    • F16C25/083—Ball or roller bearings self-adjusting with resilient means acting axially on a race ring to preload the bearing
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/50—Positive connections
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Dc Machiner (AREA)

Description

本発明は、例えば電気掃除機用の電動送風機に関する。 The invention, for example, relates to an electric blower for electric vacuum cleaners.

従来、電動機フレームを、合成樹脂で成形された樹脂フレームと、これに連結されたハウジングとで形成し、これら樹脂フレーム及びハウジングの夫々に形成された軸受取付け部内に玉軸受を嵌合して、これら玉軸受を介してロータの回転軸を枢支した電動機が知られている（例えば、特許文献１参照。）。
特開平8−126271号公報（段落0010、図１） Conventionally, an electric motor frame is formed of a resin frame formed of a synthetic resin and a housing connected thereto, and a ball bearing is fitted in a bearing mounting portion formed in each of the resin frame and the housing, An electric motor that pivotally supports a rotating shaft of a rotor via these ball bearings is known (see, for example, Patent Document 1).
JP-A-8-126271 (paragraph 0010, FIG. 1)

一般的に、一対の玉軸受で回転子（ロータ）を回転自在に支持する電動機の製造過程にあっては、軸受取付け部内に嵌合された玉軸受に起因する回転負荷を最小となるように、この玉軸受を適正な収まり状態とすることが行われている。具体的には、組立て後に慣らし運転をして、それにより玉軸受が軸受取付け部に適正になじんだ状態を得て、この後、玉軸受の外輪を軸受取付け部の内面に接着剤で固定して、前記状態を維持している。   In general, in the manufacturing process of an electric motor that rotatably supports a rotor (rotor) with a pair of ball bearings, the rotational load caused by the ball bearings fitted in the bearing mounting portion is minimized. The ball bearing is made to be in an appropriate fit state. Specifically, after the assembly, a running-in operation is performed to obtain a state in which the ball bearing is properly fitted to the bearing mounting portion, and thereafter, the outer ring of the ball bearing is fixed to the inner surface of the bearing mounting portion with an adhesive. The above state is maintained.

特許文献１には、樹脂フレームの軸受取付け部及びこの内部に装着された玉軸受を、慣らし運転に対して好適なものとする構成については記載がない。   Patent Document 1 does not describe a configuration that makes the bearing mounting portion of the resin frame and the ball bearing mounted inside the resin frame suitable for running-in operation.

ところで、合成樹脂の成形品は、成形後の熱収縮の影響による寸法のばらつきが大きく、金属のプレス成形品に比較して寸法精度を出しづらいことは知られている。そのため、樹脂フレームに形成された軸受取付け部の内径の寸法ばらつきに起因して、軸受取付け部が、その内部に嵌合された玉軸受の金属製外輪を確実に固定できないことがある。このような状態下での電動機の慣らし運転では、外輪が軸受取付け部の内周面に沿って周方向に滑りながら回転を継続する現象（クリープと称されている。）が発生する場合がある。   By the way, it is known that a molded product of a synthetic resin has a large dimensional variation due to the effect of heat shrinkage after molding, and it is difficult to obtain a dimensional accuracy compared to a metal press-molded product. Therefore, due to the dimensional variation in the inner diameter of the bearing mounting portion formed on the resin frame, the bearing mounting portion may not be able to reliably fix the metal outer ring of the ball bearing fitted therein. In the running-in operation of the electric motor in such a state, a phenomenon (referred to as creep) in which the outer ring continues to rotate while sliding in the circumferential direction along the inner peripheral surface of the bearing mounting portion may occur. .

クリープが発生すると、合成樹脂製軸受取付け部の内周面がこれより硬い外輪で擦られて摩耗する。このため、回転子が異常に振動することがある。   When creep occurs, the inner peripheral surface of the synthetic resin bearing mounting portion is worn by being rubbed by a harder outer ring. For this reason, the rotor may vibrate abnormally.

したがって、従来は、通常運転でのクリープを防止するために慣らし運転後に外輪を軸受取付け部に接着止めする手間が必要である。又、一般的に、回転子軸の回転を安定なものとするために玉軸受には軸受取付け部に収容された予圧バネで予圧が与えられているが、既述の接着止めに伴って接着材により予圧バネを固められて機能低下をもたらすことがある。それだけではなく、玉軸受の内輪が固定された金属製回転子軸と、玉軸受の外輪が接着剤で固定された合成樹脂製軸受取付け部との熱膨張率の違いにより、慣らし運転後の通常運転中に、内輪と外輪との相対位置が変化して予圧が大きく低下ないしは消失することがある。このような事態に至った場合には、回転子の振動が増加して安定した回転ができなくなる。 Therefore, conventionally, in order to prevent creep during normal operation, it is necessary to work to bond the outer ring to the bearing mounting portion after the break-in operation. In general, in order to stabilize the rotation of the rotor shaft, the ball bearing is preloaded by a preload spring accommodated in the bearing mounting portion. It can result in reduced function and potted a preload spring by wood. Not only that, but after the running-in operation, due to the difference in the coefficient of thermal expansion between the metal rotor shaft with the inner ring of the ball bearing fixed and the synthetic resin bearing mounting part with the outer ring of the ball bearing fixed with adhesive. During operation, the relative position between the inner ring and the outer ring may change and the preload may be greatly reduced or lost. When such a situation is reached, the vibration of the rotor increases and stable rotation cannot be achieved.

本発明の目的は、クリープを防止しつつ慣らし運転ができるとともに、玉軸受の温度上昇を抑制しつつ安定した通常運転を確保できる電動電動機を提供することにある。 An object of the present invention is to provide an electric motor that can perform a break-in operation while preventing creep, and can ensure a stable normal operation while suppressing a temperature increase of a ball bearing .

前記課題を解決するために、本発明の電動送風機は、軸受取付け部を有する第１、第２のフレーム部材を連結して形成され、少なくとも一方のフレーム部材を合成樹脂製とした電動機フレームに、一対の玉軸受が取付けられた回転子軸を有する回転子が、前記玉軸受を前記軸受取付け部内に個別に嵌合して回転自在に支持されるとともに、前記合成樹脂製フレーム部材の軸受取付け部の周りに排気部が設けられた電動機部と、前記電動機フレーム外に突出された前記回転子軸の端部に連結されたファンを有するファン部とで形成され、前記ファンから吐出された空気が前記電動機フレームを通り抜ける構成の電動送風機であって、前記合成樹脂製フレーム部材の軸受取付け部内に嵌合された玉軸受の外輪に圧入して固定されたリング部、このリング部から外側に折り曲げられて前記合成樹脂製フレーム部材の軸受取付け部の開口縁に連続した前記合成樹脂製フレーム部材の端壁を覆って配置されたフランジ部、及びこのフランジ部に設けられて前記外輪の外周より外側に位置するストッパを有した金属製のストッパ部材と、前記合成樹脂製フレーム部材に設けられ、このフレーム部材の軸受取付け部に対する前記外輪の回転を規制するとともに前記外輪のスラスト方向への動きを許すように前記ストッパが係合する係合部と、前記合成樹脂製フレーム部材の軸受取付け部に収容されてこの軸受取付け部内に嵌合された前記玉軸受の外輪を付勢してこの玉軸受に予圧を与える予圧バネと、を具備したことを特徴としている。 In order to solve the above problems, an electric blower of the present invention is formed by connecting first and second frame members having bearing mounting portions, and at least one of the frame members is made of a synthetic resin. A rotor having a rotor shaft to which a pair of ball bearings are mounted is rotatably supported by fitting the ball bearings individually into the bearing mounting portion, and the bearing mounting portion of the synthetic resin frame member The motor part provided with an exhaust part around the fan part and the fan part having a fan connected to the end of the rotor shaft protruding outside the motor frame, and the air discharged from the fan is An electric blower configured to pass through the electric motor frame, wherein the ring portion is press-fitted and fixed to an outer ring of a ball bearing fitted in a bearing mounting portion of the synthetic resin frame member, A flange portion that is bent outward from the flange portion and is arranged to cover an end wall of the synthetic resin frame member that is continuous with an opening edge of the bearing mounting portion of the synthetic resin frame member, and is provided on the flange portion. A metal stopper member having a stopper located outside the outer periphery of the outer ring and a synthetic resin frame member are provided on the synthetic resin frame member to restrict the rotation of the outer ring with respect to the bearing mounting portion of the frame member and to thrust the outer ring An engaging portion with which the stopper is engaged so as to allow movement in the direction, and an outer ring of the ball bearing received in the bearing mounting portion of the synthetic resin frame member and fitted in the bearing mounting portion. And a preload spring for applying a preload to the ball bearing.

本発明によれば、合成樹脂製の軸受取付け部内に嵌合された玉軸受の外輪が前記軸受取付け部に対して回転するクリープを防止しつつ慣らし運転ができるとともに、温度変化に拘わらず予圧バネによる所定の予圧を維持して安定した通常運転を確保でき、しかも、合成樹脂製の軸受取付け部内に嵌合された玉軸受の温度上昇を抑制できる電動送風機を提供できる。 According to the present invention, the outer ring of the ball bearing fitted in the bearing mounting portion made of a synthetic resin can perform a running-in while preventing creeping that rotates with respect to the bearing mounting portion, and the preload spring regardless of the temperature change. Thus, it is possible to provide an electric blower that can ensure a stable normal operation while maintaining a predetermined preload , and that can suppress an increase in temperature of a ball bearing fitted in a bearing mounting portion made of synthetic resin .

図１〜図３を参照して本発明の一実施形態を説明する。   An embodiment of the present invention will be described with reference to FIGS.

図１中符号１１は例えば電気掃除機の掃除機本体に搭載される電動送風機を示しており、これは電動機部１１ａとファン部１１ｂとで形成されている。   Reference numeral 11 in FIG. 1 indicates an electric blower mounted on, for example, a vacuum cleaner body of an electric vacuum cleaner, which is formed by an electric motor part 11a and a fan part 11b.

電動機をなす電動機部１１ａは、整流子電動機、例えば整流子付きマグネットモータからなる。この電動機部１１ａは、電動機フレーム１２と、固定子２５と、回転子３１と、一対のブラシ装置４５とを具備している。   The electric motor unit 11a constituting the electric motor is composed of a commutator motor, for example, a magnet motor with a commutator. The electric motor unit 11 a includes an electric motor frame 12, a stator 25, a rotor 31, and a pair of brush devices 45.

電動機フレーム１２は、第１のフレーム部材１３と、第２のフレーム部材２１とを連結して形成されている。   The electric motor frame 12 is formed by connecting a first frame member 13 and a second frame member 21.

第１のフレーム部材１３は例えばプラスチックス等の合成樹脂からなる一体成形品である。この第１のフレーム部材１３は、例えば円筒状をなす筒状部１４と、連結部１５と、軸受取付け部１６と、排気部１７とを有している。   The first frame member 13 is an integrally molded product made of a synthetic resin such as plastics. The first frame member 13 includes, for example, a cylindrical portion 14 having a cylindrical shape, a connecting portion 15, a bearing mounting portion 16, and an exhaust portion 17.

筒状部１４の一端は開口されている。連結部１５は、筒状部１４の一端開口縁から一体に折れ曲がって筒状部１４の外側に張り出す環状平面部１５ａと、この環状平面部１５ａの外周縁をなして一体に折り曲げられた短い嵌合筒部１５ｂとからなる。嵌合筒部１５ｂは筒状部１４と平行である。   One end of the cylindrical portion 14 is opened. The connecting portion 15 is bent integrally from one end opening edge of the tubular portion 14 and extends to the outside of the tubular portion 14, and a short is integrally bent by forming the outer peripheral edge of the annular flat portion 15 a. It consists of the fitting cylinder part 15b. The fitting cylinder part 15 b is parallel to the cylindrical part 14.

筒状部１４の他端には、その端壁１４ａの中央部に位置して筒状部１４から遠ざかるように突出した軸受取付け部１６が形成されているとともに、この軸受取付け部１６の周りに例えば180度離れて一対の排気部１７が設けられている。なお、図１中符号１４ｂは排気部１７の一部の個別に臨んで筒状部１４に形成されたブラシ取付け部を示している。図２に示すように軸受取付け部１６は、第１のフレーム部材１３の外側に向けて突出する円筒状の周壁１６ａと、この周壁１６ａの突出端から一体に折れ曲がった端壁１６ｂとから形成されている。端壁１６ｂの中央部には通孔１８が形成されている。   At the other end of the cylindrical portion 14, a bearing mounting portion 16 that is located at the center portion of the end wall 14 a and protrudes away from the cylindrical portion 14 is formed, and around the bearing mounting portion 16. For example, a pair of exhaust parts 17 are provided 180 degrees apart. In FIG. 1, reference numeral 14b denotes a brush mounting portion formed on the cylindrical portion 14 so as to face a part of the exhaust portion 17 individually. As shown in FIG. 2, the bearing mounting portion 16 is formed of a cylindrical peripheral wall 16a that protrudes toward the outside of the first frame member 13, and an end wall 16b that is bent integrally from the protruding end of the peripheral wall 16a. ing. A through hole 18 is formed at the center of the end wall 16b.

この軸受取付け部１６の筒状部１４側の内周面には逃げ部１９が設けられている。逃げ部１９は、後述する端壁１４ａ側の軸受取付け部内周面を拡径して形成されている。従って、軸受取付け部１６の内周面は、逃げ部１９からなる大径内周面部と、これより小径な小径内周面とで形成されている。 An escape portion 19 is provided on the inner peripheral surface of the bearing mounting portion 16 on the cylindrical portion 14 side. Relief portion 19 is formed by enlarged bearing mounting portion peripheral surface of the end wall 14a side, which will be described later. Therefore, the inner peripheral surface of the bearing mounting portion 16 is formed by a large-diameter inner peripheral surface portion composed of the relief portion 19 and a small-diameter inner peripheral surface having a smaller diameter.

図２及び図３に示すように第１のフレーム部材１３には係合部２０が一体に形成されている。係合部２０は例えば筒状部１４内に向けて突出する凸部で形成されている。この係合部２０は、軸受取付け部１６の内周面を基準として外側に、例えば側面の一部が逃げ部１９に面一に連続するように設けられている。   As shown in FIGS. 2 and 3, the first frame member 13 is integrally formed with an engaging portion 20. The engaging portion 20 is formed by a convex portion that protrudes into the cylindrical portion 14, for example. The engaging portion 20 is provided on the outer side with respect to the inner peripheral surface of the bearing mounting portion 16, for example, so that a part of the side surface is flush with the escape portion 19.

第２のフレーム部材２１は筒状部１４の一端開口を径方向に横切る形状をなす金属のプレス成形品からなる。図１に示すように第２のフレーム部材２１は、その両端部２１ａ（一方のみ図示する。）を環状平面部１５ａに夫々ねじ２２（１本のみ図示する。）で固定することによって、第１のフレーム部材１３に夫々連結されている。第２のフレーム部材２１の両側縁と筒状部１４の一端開口の縁との間には弦月形状の空気入り口が形成されている。この第２のフレーム部材２１の中央部には、筒状部１４から遠ざかる方向に突出した軸受取付け部２３が一体に形成されている。この軸受取付け部２３の端壁中央部には通孔が開けられている。   The second frame member 21 is made of a metal press-molded product having a shape that crosses one end opening of the cylindrical portion 14 in the radial direction. As shown in FIG. 1, both ends 21a (only one is shown) of the second frame member 21 are fixed to the annular flat surface portion 15a with screws 22 (only one is shown). The frame members 13 are respectively connected. Between the both side edges of the second frame member 21 and the edge of the one end opening of the tubular portion 14, a chorus-shaped air inlet is formed. A bearing mounting portion 23 is integrally formed at the center of the second frame member 21 so as to protrude in a direction away from the tubular portion 14. A through hole is formed in the center of the end wall of the bearing mounting portion 23.

図１に示すように固定子２５は筒状部１４の内側に収納して取付けられている。固定子２５は環状であり、その内周面には２個のマグネット２５ａ（一方のみ図示する。）が装着されている。これらのマグネット２５ａは、厚み方向に着磁されていて、固定子２５の内空部に臨んだ磁極面に現れた磁極は互いに異なっている。固定子２５の外周面と筒状部１４の内周面との間には、前記空気入り口及び筒状部１４の一端開口と排気部１７とを連通するフレーム内通路が設けられている。   As shown in FIG. 1, the stator 25 is housed and attached inside the cylindrical portion 14. The stator 25 is annular, and two magnets 25a (only one is shown) are mounted on the inner peripheral surface thereof. These magnets 25a are magnetized in the thickness direction, and the magnetic poles appearing on the magnetic pole surfaces facing the inner space of the stator 25 are different from each other. Between the outer peripheral surface of the stator 25 and the inner peripheral surface of the cylindrical portion 14, an in-frame passage that communicates the air inlet and the one end opening of the cylindrical portion 14 and the exhaust portion 17 is provided.

回転子３１は、回転子軸３２にアーマチュアコイル３３が巻き付けられたアーマチュアコア３４と、整流子３５と、一対の玉軸受３６，３７を取付けて形成されている。アーマチュアコイル３３の端末は整流子３５に接続されている。玉軸受３６，３７は、その金属製内輪を回転子軸３２に嵌合固定してアーマチュアコア３４及び整流子３５を間に置いて回転子軸３２に取付けられている。   The rotor 31 is formed by attaching an armature core 34 in which an armature coil 33 is wound around a rotor shaft 32, a commutator 35, and a pair of ball bearings 36 and 37. The terminal of the armature coil 33 is connected to the commutator 35. The ball bearings 36 and 37 are attached to the rotor shaft 32 with the metal inner ring fitted and fixed to the rotor shaft 32 with the armature core 34 and the commutator 35 interposed therebetween.

回転子３１は、整流子３５に近い方の玉軸受３６を第１のフレーム部材１３の軸受取付け部１６内に嵌合するとともに、整流子３５から遠い方の玉軸受３７を第２のフレーム部材２１の軸受取付け部２３内に嵌合させることにより、固定子２５の内側に配置されて電動機フレーム１２に回転自在に取付けられている。この取付け状態で、アーマチュアコア３４はマグネット２５ａとの間に僅かなギャップを設けて対向し、又、回転子軸３２は軸受取付け部２３の通孔を通って電動機フレーム１２の外部に突出されている。   In the rotor 31, the ball bearing 36 closer to the commutator 35 is fitted into the bearing mounting portion 16 of the first frame member 13, and the ball bearing 37 farther from the commutator 35 is fitted to the second frame member. By being fitted in the bearing mounting portion 23 of the motor 21, it is disposed inside the stator 25 and is rotatably mounted on the motor frame 12. In this attached state, the armature core 34 is opposed to the magnet 25a with a slight gap, and the rotor shaft 32 is projected to the outside of the motor frame 12 through the through hole of the bearing mounting portion 23. Yes.

図２及び図３に示すように合成樹脂製の軸受取付け部１６内に嵌合された玉軸受３６の金属製の外輪３６ａにはストッパ３８が設けられている。   As shown in FIGS. 2 and 3, a stopper 38 is provided on the metal outer ring 36a of the ball bearing 36 fitted in the bearing mounting portion 16 made of synthetic resin.

詳しくは、外輪３６ａにはリング状のストッパ部材３９が取付けられている。ストッパ部材３９は、金属のプレス成形品であって、外輪３６ａへの固定部として機能するリング部３９ａと、このリング部３９ａの一端から外側へ直角状に折り曲げられたフランジ部３９ｂとからなる。そして、フランジ部３９ｂにその一部を切欠くことによってストッパ３８が形成されている。ストッパ部材３９は、そのリング部３９ａを外輪３６ａの一端部外周面に圧入することによって、外輪３６ａに固定されている。したがって、ストッパ３８は外輪３６ａの外周より外側に位置している。   Specifically, a ring-shaped stopper member 39 is attached to the outer ring 36a. The stopper member 39 is a metal press-molded product, and includes a ring portion 39a that functions as a fixing portion to the outer ring 36a, and a flange portion 39b that is bent at a right angle from one end of the ring portion 39a. A stopper 38 is formed by cutting a part of the flange portion 39b. The stopper member 39 is fixed to the outer ring 36a by press-fitting the ring part 39a into the outer peripheral surface of one end of the outer ring 36a. Therefore, the stopper 38 is located outside the outer periphery of the outer ring 36a.

玉軸受３６は、その外輪３６ａの外周面を、軸受取付け部１６の筒状部１４の小径孔部内周面に嵌め合わせて軸受取付け部１６内に取付けられている。外輪３６ａは筒状部１４の小径孔部内周面に接着止めされることなく単に嵌り合っているだけである。この取付け状態では、図２に示すようにリング部３９ａが筒状部１４の内周面には接しないように逃げ部１９内に配置されるとともに、フランジ部３９ｂが逃げ部１９の開口縁に連続する軸受取付け部２３の端壁１４ａの内面を覆って配置される。こうした配置に伴い切欠きからなるストッパ３８には、端壁１４ａの内面に突設された係合部２０が挿入されている（図３参照）。この挿入を容易にするためにストッパ３８の幅を係合部２０の直径より大きくしてある。係合部２０とストッパ３８とは、互いに係合された状態で外輪３６ａがスラスト方向に動くことを許すようになっている。 The ball bearing 36 is mounted in the bearing mounting portion 16 by fitting the outer peripheral surface of the outer ring 36 a to the inner peripheral surface of the small diameter hole portion of the cylindrical portion 14 of the bearing mounting portion 16. The outer ring 36a is simply fitted to the inner peripheral surface of the small diameter hole portion of the cylindrical portion 14 without being bonded. In this attached state, as shown in FIG. 2, the ring portion 39 a is disposed in the escape portion 19 so as not to contact the inner peripheral surface of the cylindrical portion 14, and the flange portion 39 b is at the opening edge of the escape portion 19. It arrange | positions so that the inner surface of the end wall 14a of the continuous bearing attaching part 23 may be covered. In accordance with such an arrangement, the engaging portion 20 protruding from the inner surface of the end wall 14a is inserted into the stopper 38 formed of a notch (see FIG. 3). In order to facilitate this insertion, the width of the stopper 38 is made larger than the diameter of the engaging portion 20. The engaging portion 20 and the stopper 38, the outer ring 36a is adapted to allow the movement in the thrust direction in a state of being engaged with one another.

図２中符号４０は中央部が凹んだ浅皿状をなす金属円板からなる軸受キャップを示し、符号４１はリング状でかつその周方向に沿って波形状に形成された予圧バネ４１を示している。玉軸受３６に予圧を与える軸受キャップ４０及び予圧バネ４１は、軸受キャップ４０の周部４０ａを端壁１６ｂ側の外輪３６ａの端面に接触させるとともに、軸受キャップ４０と端壁１６ｂとの間に予圧バネ４１を挟んで、軸受取付け部１６内に収容されている。この収容状態では、予圧バネ４１のバネ力が内輪３６ｂ及び回転子軸３２には作用しないように、軸受キャップ４０の凹んだ中央部４０ｂと内輪３６ｂの端面及び回転子軸３２の端面とは、非接触状態に接近している。   In FIG. 2, reference numeral 40 denotes a bearing cap made of a shallow disk-shaped metal disk having a recessed central portion, and reference numeral 41 denotes a ring-shaped preload spring 41 formed in a wave shape along the circumferential direction. ing. The bearing cap 40 and the preload spring 41 that apply preload to the ball bearing 36 bring the peripheral portion 40a of the bearing cap 40 into contact with the end surface of the outer ring 36a on the end wall 16b side, and preload between the bearing cap 40 and the end wall 16b. The bearing 41 is accommodated in the bearing mounting portion 16 with the spring 41 interposed therebetween. In this accommodated state, the recessed central portion 40b of the bearing cap 40, the end surface of the inner ring 36b, and the end surface of the rotor shaft 32 are such that the spring force of the preload spring 41 does not act on the inner ring 36b and the rotor shaft 32. Approaching a non-contact state.

したがって、予圧バネ４１のバネ力は、回転子軸３２の軸方向に沿って外輪３６ａに図２中矢印Ａ方向の予圧荷重を与えるとともに、それに伴い相対的に玉軸受３６の内輪３６ｂに図２中矢印Ｂ方向の予圧荷重を与えている。これにより、玉軸受３６の内部隙間（鋼球やころ等の転動子３６ｃと外輪３６ａ及び内輪３６ｂとの間の隙間）を消失させて、回転子３１の回転精度が向上されている。   Therefore, the spring force of the preload spring 41 applies a preload load in the direction of arrow A in FIG. 2 to the outer ring 36a along the axial direction of the rotor shaft 32, and is relatively applied to the inner ring 36b of the ball bearing 36 accordingly. A preload load in the direction of the middle arrow B is applied. Thereby, the internal clearance of the ball bearing 36 (the clearance between the rolling elements 36c such as steel balls and rollers and the outer ring 36a and the inner ring 36b) is eliminated, and the rotational accuracy of the rotor 31 is improved.

図１に示すようにブラシ装置４５は、第１のフレーム部材１３のブラシ取付け部１４ｂに個別に取付けられている。この取付けは、ブラシ取付け部１４ｂにセットされたブラシ装置４５をその長手方向と直交する方向に横切る押え板４７を、ブラシ取付け部１４ｂにねじ４８で止めることにより、この押え板４７でブラシ取付け部１４ｂにブラシ装置４５を固定して実施されている。このブラシ装置４５が有するブラシ４５ａは、コイルバネ４５ｂのバネ力で整流子３５に押付けられている。   As shown in FIG. 1, the brush device 45 is individually attached to the brush attachment portion 14 b of the first frame member 13. In this attachment, the holding plate 47 that crosses the brush device 45 set in the brush attaching portion 14b in a direction orthogonal to the longitudinal direction thereof is fastened to the brush attaching portion 14b with a screw 48. The brush device 45 is fixed to 14b. The brush 45a included in the brush device 45 is pressed against the commutator 35 by the spring force of the coil spring 45b.

図１に示すようにファン部１１ｂは、金属製のファン５１と、金属製のファンカバー５２とを備えている。ファン５１は、電動機フレーム１２の外部に突出された回転子軸３２の端部に連結されている。ファン５１は電動機部１１ａへの通電により毎分数万回転の高速度で回転されて、その外周部から空気を吐出す。ファンカバー５２は、その円形をなした外周壁部５２ａを前記嵌合筒部１５ｂの外周に嵌合して取付けられている。このファンカバー５２の中央部にはファン５１の吸込み口と対向する開口が設けられている。   As shown in FIG. 1, the fan unit 11 b includes a metal fan 51 and a metal fan cover 52. The fan 51 is connected to the end of the rotor shaft 32 that protrudes outside the electric motor frame 12. The fan 51 is rotated at a high speed of several tens of thousands of revolutions per minute by energization of the electric motor unit 11a, and discharges air from the outer peripheral portion thereof. The fan cover 52 is attached by fitting a circular outer peripheral wall portion 52a to the outer periphery of the fitting cylinder portion 15b. An opening facing the suction port of the fan 51 is provided at the center of the fan cover 52.

ファン５１と前記第１のフレーム部材１３との間には、合成樹脂製の整流体５３が設けられている。整流体５３はファン５１から吐出された風を整流して静圧化しながら前記空気入り口及び筒状部１４の一端開口に導く。この整流体５３の中央部は第２のフレーム部材２１にねじ５４で止められているとともに、整流体５３の周部は環状平面部１５ａとファンカバー５２の内面とで挟持されている。   A rectifier 53 made of synthetic resin is provided between the fan 51 and the first frame member 13. The rectifier 53 guides the air discharged from the fan 51 to the air inlet and the one end opening of the tubular portion 14 while reducing the static pressure. The central portion of the rectifying body 53 is fixed to the second frame member 21 with screws 54, and the peripheral portion of the rectifying body 53 is sandwiched between the annular flat surface portion 15 a and the inner surface of the fan cover 52.

前記構成の電動送風機１１の製造時に、この電動送風機１１は組立てられた状態で慣らし運転される。それにより、玉軸受３６の外輪３６ａがスラスト方向に対して微妙に傾器を修正して、この外輪３６ａを玉軸受３６が内部に嵌合された軸受取付け部１６の周壁１６ａになじませることができるとともに、ブラシ４５ａと整流子３５との当たり方もなじませることができる。   At the time of manufacturing the electric blower 11 having the above-described configuration, the electric blower 11 is operated in an assembled state. Accordingly, the outer ring 36a of the ball bearing 36 can be slightly corrected with respect to the thrust direction, and the outer ring 36a can be adapted to the peripheral wall 16a of the bearing mounting portion 16 in which the ball bearing 36 is fitted. At the same time, the way the brush 45a and the commutator 35 come into contact with each other can be adjusted.

この慣らし運転の際に、玉軸受３６の外輪３６ａにはこれを回転させようとする力が回転子軸３２から波及する。なお、図３中矢印Ｃは回転子軸３２の回転方向を示している。それにも拘らず、外輪３６ａが回り始めようとすると、この外輪３６ａのストッパ３８が、直ちに、第１のフレーム部材１３の係合部２０に係合する。つまり、ストッパ３８が係合部２０に引っ掛かる。これにより、合成樹脂製であるために寸法精度が出づらい軸受け取付け部１６の周壁１６ａに玉軸受３６の外輪３６ａが滑りながら回転するクリープを防止できる。このクリープの防止において係合部２０はストッパ３８ａを有した外輪３６ａのスラストに方向に対する微妙な傾動を妨げることはない。   During this break-in operation, a force to rotate the outer ring 36 a of the ball bearing 36 is transmitted from the rotor shaft 32. Note that an arrow C in FIG. 3 indicates the rotation direction of the rotor shaft 32. Nevertheless, when the outer ring 36a starts to rotate, the stopper 38 of the outer ring 36a immediately engages with the engaging portion 20 of the first frame member 13. That is, the stopper 38 is hooked on the engaging portion 20. Thereby, since it is made of a synthetic resin, it is possible to prevent creep that the outer ring 36a of the ball bearing 36 rotates while sliding on the peripheral wall 16a of the bearing mounting portion 16 that is difficult to obtain dimensional accuracy. In preventing the creep, the engaging portion 20 does not prevent a slight tilting relative to the direction of the thrust of the outer ring 36a having the stopper 38a.

したがって、前記慣らし運転に伴うクリープの防止により、軸受取付け部１６の内周面がこれより硬い玉軸受３６の外輪３６ａで擦られて摩耗することがなくなるため、クリープを原因として、回転子３１が異常振動することを防止できる。これにより、回転を適正に制御することが不能な状態となって、故障するという最悪の事態を至ることがない。   Therefore, by preventing creep due to the running-in operation, the inner peripheral surface of the bearing mounting portion 16 is not rubbed and worn by the outer ring 36a of the ball bearing 36 that is harder than this, so that the rotor 31 is caused by creep. Abnormal vibration can be prevented. As a result, the rotation cannot be properly controlled, and the worst situation of failure occurs.

なお、回転子軸３２を支持した他の玉軸受３７が嵌合された軸受取付け部２３は、金属のプレス成形品からなる第２のフレーム部材２１に一体に形成されたものであるので、その寸法精度が高い。このため、軸受取付け部２３の内面と玉軸受３７の外輪との嵌め合い部には、この外輪に波及する回転力に十分に抗する高い摩擦力を得ることができるので、クリープを生じることがない。   The bearing mounting portion 23 into which the other ball bearing 37 supporting the rotor shaft 32 is fitted is formed integrally with the second frame member 21 made of a metal press-molded product. High dimensional accuracy. For this reason, since the high frictional force which resists the rotational force which spreads to this outer ring | wheel can be obtained in the fitting part of the inner surface of the bearing attachment part 23, and the outer ring | wheel of the ball bearing 37, creep may arise. Absent.

そして、以上のように係合部２０とストッパ３８とでクリープを防止したことにより、慣らし運転後の通常運転でのクリープ防止のために、慣らし運転後に、玉軸受３６の外輪３６ａを軸受取付け部１６の内周面に接着剤を用いて固定する手間を要しないので、製造が容易になる。   As described above, since the creep is prevented by the engaging portion 20 and the stopper 38, the outer ring 36a of the ball bearing 36 is connected to the bearing mounting portion after the break-in operation in order to prevent creep in the normal operation after the break-in operation. Since it does not require the trouble of fixing to the inner peripheral surface of 16 using an adhesive, manufacture becomes easy.

それだけではなく、接着を要しないので予圧バネ４１が接着剤で固められてバネ機能が損なわれることがない。これに加えて、軸受取付け部１６の周壁１６ａ内周面に対して接着剤で固定されていない外輪３６ａは、スラスト方向に動き得るので、以下の利点がある。   In addition, since the bonding is not required, the preload spring 41 is not hardened by the adhesive and the spring function is not impaired. In addition, the outer ring 36a that is not fixed to the inner peripheral surface of the peripheral wall 16a of the bearing mounting portion 16 with an adhesive can move in the thrust direction, and thus has the following advantages.

つまり、慣らし運転後の通常運転時には、電動送風機１１自体の発熱や周囲温度の変化等の影響を受けて、金属製の回転子軸３２と合成樹脂製の軸受取付け部１６とは、夫々の材質に応じた熱膨張率で熱膨張する。この場合、既述のように予圧バネ４１が機能しているとともに、クリープを防止するための手段が外輪３６ａのスラスト方向の動きを規制してないので、回転子軸３２に固定された内輪３６ｂと外輪３６ａとの相対位置が変化することが防止される。これにより、玉軸受３６に対する予圧バネ４１による予圧の変化がなくなり、予圧を一定に保持できる。したがって、予圧の消失により回転子３１の振動がもたらされることがなく、回転子３１を安定して回転させることができる。   In other words, during the normal operation after the break-in operation, the metal rotor shaft 32 and the synthetic resin bearing mounting portion 16 are made of different materials due to the influence of heat generation of the electric blower 11 itself and changes in ambient temperature. It expands at a coefficient of thermal expansion corresponding to In this case, as described above, the preload spring 41 is functioning, and the means for preventing creep does not restrict the movement of the outer ring 36a in the thrust direction, so that the inner ring 36b fixed to the rotor shaft 32 can be used. And the relative position of the outer ring 36a are prevented from changing. Thereby, the change of the preload by the preload spring 41 with respect to the ball bearing 36 is lost, and the preload can be kept constant. Therefore, the vibration of the rotor 31 is not caused by the disappearance of the preload, and the rotor 31 can be rotated stably.

又、外輪３６ａに設けられた金属製のストッパ部材３９のフランジ部３９ｂには、慣らし運転後の通常運転時に電動機フレーム１２を通り抜ける風の一部が吹き当てられる。このため、外輪３６ａの熱がストッパ部材３９を介して排気中に放出され、結果的に玉軸受３６の温度上昇を抑制できる。   Further, a part of the wind passing through the motor frame 12 is blown to the flange portion 39b of the metal stopper member 39 provided on the outer ring 36a during the normal operation after the break-in operation. For this reason, the heat of the outer ring 36a is released into the exhaust through the stopper member 39, and as a result, the temperature rise of the ball bearing 36 can be suppressed.

本発明は前記一実施形態には制約されない。   The present invention is not limited to the one embodiment.

又、係合部２０とストッパ３８との関係は前記一実施形態とは逆にすることができ、具体的には、合成樹脂製の第１のフレーム部材１３に設けた係合部２０を溝（凹み）又は孔で形成するとともに、これに挿入して係合される（引っ掛かる）ストッパ３８を突部で形成することができる。 Further, the relationship between the engaging portion 20 and the stopper 38 can be reversed from that in the above-described embodiment. Specifically, the engaging portion 20 provided on the first frame member 13 made of synthetic resin is provided with a groove. A stopper 38 can be formed with a protrusion, which is formed by a (dent) or hole, and is inserted into and engaged (hooked) .

しかし、前記一実施例のようにリング状のストッパ部材３９を用いることは、玉軸受３６の外輪３６ａにストッパ３８を後付けする場合に、ストッパ３８を有したストッパ部材３９を外輪３６ａに連結し易い点で好ましい。   However, the use of the ring-shaped stopper member 39 as in the above-described embodiment makes it easy to connect the stopper member 39 having the stopper 38 to the outer ring 36a when the stopper 38 is retrofitted to the outer ring 36a of the ball bearing 36. This is preferable.

更に、電動機ケースをなす第１のフレーム部材１３と第２のフレーム部材２１とはいずれも合成樹脂製であってもよい。 Further, both the first frame member 13 and the second frame member 21 forming the electric motor case may be made of synthetic resin .

又、予圧バネ４１のバネ力は通常２kg／cmであるが、このバネ力を通常の倍以上例えば５２kg／cmに設定して、予圧バネ４１の周部４１ａと玉軸受３６の外輪３６ａとの摩擦力を高めることは本発明において妨げるものではなく。そして、このように摩擦力を高めることは、その摩擦力でも玉軸受３６のクリープを防止できるので好ましい。   Further, the spring force of the preload spring 41 is normally 2 kg / cm, but this spring force is set to be more than double the normal force, for example, 52 kg / cm, so that the peripheral portion 41 a of the preload spring 41 and the outer ring 36 a of the ball bearing 36 are Increasing the frictional force does not hinder the present invention. And it is preferable to increase the frictional force in this way because the frictional force can prevent the ball bearing 36 from creeping.

本発明の一実施形態に係る電動送風機を一部断面して示す断面図。1 is a cross-sectional view illustrating a part of an electric blower according to an embodiment of the present invention. 図１中Ｆ２部を拡大して示す断面図。Sectional drawing which expands and shows the F2 part in FIG. 図２中Ｆ３−Ｆ３線に沿って示す断面図。Sectional drawing shown along the F3-F3 line | wire in FIG.

符号の説明Explanation of symbols

１１…電動送風機、１１ａ…電動機部、１１ｂ…ファン部、１２…電動機フレーム、１３…第１のフレーム部材、１４ａ…端壁、１６…軸受取付け部、１７…排気部、２０…係合部、２１…第２のフレーム部材、２２…ねじ、２３…軸受取付け部、３１…回転子、３２…回転子軸、３６，３７…玉軸受、３６ａ…外輪、３８…ストッパ、３９…ストッパ部材、３９ａ…リング部、３９ｂ…フランジ部、４１…予圧バネ、５１…ファン DESCRIPTION OF SYMBOLS 11 ... Electric blower, 11a ... Electric motor part, 11b ... Fan part, 12 ... Electric motor frame, 13 ... 1st frame member, 14a ... End wall, 16 ... Bearing attachment part , 17 ... Exhaust part, 20 ... Engagement part, 21 ... second frame member, 22 ... screw, 23 ... bearing mounting portion, 31 ... rotor, 32 ... rotor shaft, 36, 37 ... ball bearing, 36a ... outer ring, 38 ... stopper, 39 ... stopper member, 39a ... Ring part, 39b ... Flange part , 41 ... Preload spring , 51 ... Fan

Claims (1)

軸受取付け部を有する第１、第２のフレーム部材を連結して形成され、少なくとも一方のフレーム部材を合成樹脂製とした電動機フレームに、一対の玉軸受が取付けられた回転子軸を有する回転子が、前記玉軸受を前記軸受取付け部内に個別に嵌合して回転自在に支持されるとともに、前記合成樹脂製フレーム部材の軸受取付け部の周りに排気部が設けられた電動機部と、前記電動機フレーム外に突出された前記回転子軸の端部に連結されたファンを有するファン部とで形成され、前記ファンから吐出された空気が前記電動機フレームを通り抜ける構成の電動送風機であって、
前記合成樹脂製フレーム部材の軸受取付け部内に嵌合された玉軸受の外輪に圧入して固定されたリング部、このリング部から外側に折り曲げられて前記合成樹脂製フレーム部材の軸受取付け部の開口縁に連続した前記合成樹脂製フレーム部材の端壁を覆って配置されたフランジ部、及びこのフランジ部に設けられて前記外輪の外周より外側に位置するストッパを有した金属製のストッパ部材と、
前記合成樹脂製フレーム部材に設けられ、このフレーム部材の軸受取付け部に対する前記外輪の回転を規制するとともに前記外輪のスラスト方向への動きを許すように前記ストッパが係合する係合部と、
前記合成樹脂製フレーム部材の軸受取付け部に収容されてこの軸受取付け部内に嵌合された前記玉軸受の外輪を付勢してこの玉軸受に予圧を与える予圧バネと、
を具備したことを特徴とする電動送風機。 A rotor having a rotor shaft in which a pair of ball bearings are mounted on an electric motor frame formed by connecting first and second frame members having bearing mounting portions and at least one of the frame members is made of synthetic resin. but it is rotatably supported fitted individually the ball bearing into the bearing mounting portion Rutotomoni, motor unit exhaust portion is provided around the bearing mounting portion of the synthetic resin frame member and said electric motor An electric blower having a configuration in which air discharged from the fan passes through the electric motor frame, and is formed by a fan unit having a fan connected to an end of the rotor shaft protruding outside the frame ;
A ring portion that is press-fitted into an outer ring of a ball bearing that is fitted into a bearing mounting portion of the synthetic resin frame member, and is bent outward from the ring portion to open the bearing mounting portion of the synthetic resin frame member A metal stopper member having a flange portion arranged to cover an end wall of the synthetic resin frame member continuous to the edge, and a stopper provided on the flange portion and positioned outside the outer periphery of the outer ring;
An engaging portion that is provided on the synthetic resin frame member and that engages the stopper so as to restrict the rotation of the outer ring relative to the bearing mounting portion of the frame member and allow the outer ring to move in the thrust direction;
A preload spring providing a preload to the ball bearing to urge the outer race of the accommodated in the bearing mounting portion of the synthetic resin frame member said ball bearing mated to the bearing mounting portion,
An electric blower comprising:
JP2005029102A 2005-02-04 2005-02-04 Electric blower Expired - Fee Related JP4630681B2 (en)

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Publication number Priority date Publication date Assignee Title
WO2013046526A1 (en) * 2011-09-29 2013-04-04 パナソニック株式会社 Electric motor
CN106321638A (en) * 2016-09-20 2017-01-11 南京埃斯顿自动控制技术有限公司 Rotation stopping structure for bearing outer ring
KR20240080911A (en) * 2022-11-30 2024-06-07 엘지전자 주식회사 Fan motor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0182652U (en) * 1987-11-18 1989-06-01
JPH03212140A (en) * 1990-01-10 1991-09-17 Shibaura Eng Works Co Ltd Bearing mounting structure for molded motor
JPH06200950A (en) * 1993-01-08 1994-07-19 Fuji Electric Co Ltd Bearing device of rotating machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0182652U (en) * 1987-11-18 1989-06-01
JPH03212140A (en) * 1990-01-10 1991-09-17 Shibaura Eng Works Co Ltd Bearing mounting structure for molded motor
JPH06200950A (en) * 1993-01-08 1994-07-19 Fuji Electric Co Ltd Bearing device of rotating machine

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