JP3377247B2

JP3377247B2 - Fan device

Info

Publication number: JP3377247B2
Application number: JP09538393A
Authority: JP
Inventors: 秀二高橋
Original assignee: Nidec Corp
Current assignee: Nidec America Corp
Priority date: 1993-03-29
Filing date: 1993-03-29
Publication date: 2003-02-17
Anticipated expiration: 2018-02-17
Also published as: JPH06284637A

Description

【発明の詳細な説明】【０００１】【産業上の利用分野】本発明はファン装置に関する。【０００２】【従来の技術】ステータを固着したハウジングと、該ハ
ウジングにシャフトを介して枢支された羽根付きロータ
と、を備えたファン装置では、従来、上記ハウジングに
立設された円筒部の内周面に、ベアリング軸受を介し
て、シャフトを回転自在に枢着していた。【０００３】【発明が解決しようとする課題】しかし、ベアリング軸
受は高価であるためにコスト高となり、しかも、組立・
分解が面倒で、部品交換等が容易ではなかった。【０００４】そこで、本発明は従来のこのような問題点
を解決して、組立が容易で安価製作が可能なファン装置
を提供することを目的とする。【０００５】【課題を解決するための手段】上記目的を達成するた
めに、ステータを固着したハウジングと、該ハウジング
にシャフトを介して枢支された羽根付きロータと、を備
えたファン装置に於て、上記ハウジングの円筒部の内周
面に、すべり軸受を介してシャフトを回転自在に枢支
し、該シャフトの基端面に摺接してスラスト力を受ける
スラスト受け部材を、上記円筒部の基端側内周面に嵌め
込み、該スラスト受け部材の外周に、上記円筒部の基端
側内周面に形成された係合孔に弾発的に係脱可能な係合
爪片を突設し、該スラスト受け部材により上記すべり軸
受を上記円筒部の先端の軸内方向端面に押圧させた状態
で、該スラスト受け部材の係合爪片を円筒部の係合孔に
係合させることにより、スラスト受け部材及びすべり軸
受を円筒部に固定し、かつ、該スラスト受け部材の基端
面に、該スラスト受け部材に回転トルクを与えて係合爪
片を係合孔から離脱させるための脱着用工具差し込み部
を形成したものである。【０００６】【作用】スラスト受け部材を、ハウジングの円筒部の基
端側内周面に挿入して押し込めば、係合爪片が係合孔に
係止して、すべり軸受を、円筒部の軸内方向端面にスラ
スト受け部材で押圧して固定することができ、かつ、ス
ラスト受け部材がシャフトの基端面に摺接してスラスト
力を受けることができる。【０００７】この状態から、工具差し込み部にドライバ
ー等を差し込んで周方向に回転させれば、係合爪片が、
円筒部の基端側内周面に乗り上げて係合孔から離脱する
ので、スラスト受け部材を該基端側内周面から抜き出し
て、簡単に、部品交換等のための分解が行える。【０００８】【実施例】以下実施例を示す図面に基づいて本発明を詳
説する。【０００９】図１は本発明に係るファン装置の断面図を
例示しており、１はプラスチック等からなるハウジング
であって、このハウジング１は、浅皿状の支持部２と、
支持部２に立設された円筒部３を有している。【００１０】４はステータであり、このステータ４は、
ステータコア５に一対のインシュレータ６，７を介して
ステータコイル８を巻設してなる。【００１１】このステータ４は、円筒部３に外嵌され、
インシュレータ６の先端筒部９に突設された弾性凸部10
を、円筒部３の先端外周面に形成された凹部11に係止す
ることにより、弾発的に固定される。【００１２】そして、一方のインシュレータ７の垂下片
12を介して、端子13の一端が回路基板14に接続され、端
子13の他端はステータコイル８に接続される。また、回
路基板14は、ハウジング１に固定される。【００１３】15は碗形のロータで、このロータ15の外周
面には複数の羽根16…が突設される。さらに、ロータ15
の内周面には、円環状のヨーク17を介してロータマグネ
ット18が固着され、ステータコア５の外周面とロータマ
グネット18の内周面は微小間隙をもって対面する。【００１４】また、ロータ15の中心孔部19にはシャフト
20の先端部が固着される。このシャフト20は、すべり軸
受21を介して、円筒部３の内周面に回転自在に枢支さ
れ、その基端部には抜止用リング27が取付けられる。【００１５】そして、回路基板14を介してステータコイ
ル８に流れる制御電流によって、ロータ15が回転し、羽
根16…にて送風が行なわれる。【００１６】しかして、すべり軸受21は、円筒状スリー
ブ体22と、スリーブ体22の外周面に被覆された薄肉円筒
状のカバー部材23と、からなり、スリーブ体22には、耐
摩耗性を有する鉄−銅系の焼結合金が用いられる。【００１７】スリーブ体22は、外径方向に開口する凹周
部24を有し、また、カバー部材23には、凹周部24に対応
する小貫孔25が、周方向に２箇所配設される。【００１８】この凹周部24とカバー部材23の内周面にて
形成される油溜り用円環状空室部26には、一方の小貫孔
25を介して、油Ｒが注入され保持される。このとき、他
方の小貫孔25は排気孔となる。【００１９】なお、空室部26に注入した油Ｒがファン組
立時等に於て容易に漏れないような径寸法に、小貫孔25
は形成される。【００２０】このようにすれば、予め油Ｒをすべり軸受
21に注入して、その後、すべり軸受21を円筒部３の内周
面に装着することができるので、ファンを組立た後に油
を注入する場合に比べ、組立作業が容易となる利点があ
る。【００２１】しかも、空室部26に十分な量の油Ｒが保持
されるので長期間の使用でもすべり軸受21が油切れとな
らず、シャフト20、すべり軸受21等の耐久性が向上する
利点もある。【００２２】しかして、円筒部３は、断面Ｌ字型の先端
内鍔部32と、すべり軸受21が挿嵌される中間軸心孔30
と、中間軸心孔30よりも大径であってスラスト受け部材
29が嵌め込まれる基端軸心孔31と、を有している。【００２３】この先端内鍔部32の内周面33には、シャフ
ト20が挿通され、微小間隙をもって対面する内周面33と
シャフト20の外周面とで、すべり軸受21から外部への油
漏れを防止するラビリンスシール溝34が、形成される。【００２４】次に、スラスト受け部材29は、ポリブチレ
ンテレフタレート、アクリロニトリル・ブタジエンスチ
レン共重合体、ポリプロピレン等の樹脂材にて一体形成
される嵌合体35と、ポリフェニレンサルファイト樹脂複
合材からなる低摩擦・耐摩耗の支持体36と、を有してい
る。【００２５】嵌合体35は、基端軸心孔31に嵌合可能な円
筒状の周壁部37と、支持体36が嵌合状に保持される碗型
の中央保持部38と、周壁部37と中央保持部38をつなぐテ
ーパ状の連結部39と、からなり、中央保持部38の基端面
には、スラスト受け部材29に回転トルクを与えるための
脱着用工具差し込み部43が凹設される。【００２６】この工具差し込み部43は、ドライバー等の
工具の先端形状に対応させて、図２(A)(B)(C) に示すよ
うに、プラス、六角、マイナス等各種形状に形成され
る。【００２７】そして、図１と図３に示すように、基端軸
心孔31の内周面に形成された矩形状の係合孔40に、弾発
的に係脱可能な係合爪片41が、周壁部37の外周に突設さ
れる。【００２８】なお、図例では、係合孔40は、円筒部３の
基端部に貫通状に形成され、係合孔40と、これに対応す
る係合爪片41とは、夫々、周方向に複数形成される。【００２９】さらに、係合爪片41の側縁部46，46に沿っ
て、軸方向のスリット44，44が形成されており、この係
合爪片41を含む垂下片部45が、径方向に弾性変形可能と
なっている。【００３０】また、係合爪片41は、その側縁部46，46か
ら中央部47にかけて（周壁部37の外周面よりも）漸次外
方へ突出し、かつ、先端部（図の上方）から基端部（図
の下方）にかけて漸次外方へ突出するように形成され
る。【００３１】このスラスト受け部材29を、基端軸心孔31
に挿入して押し込めば、図４の仮想線で図示するよう
に、係合爪片41が、基端軸心孔31に乗り上げて一旦内径
方向に逃げた後、実線で図示するように、係合爪片41
が、係合孔40と一致したところで外径方向に復元して係
止する。【００３２】これにより、図１に示すように、スラスト
受け部材29の周壁部37の先端段付面48で、すべり軸受21
を、先端内鍔部32の軸内方向端面42に押圧して固定する
ことができる。【００３３】さらに、支持体36の先端面は、シャフト20
の基端面28に摺接可能となり、そのスラスト力を、スラ
スト受け部材29を介してハウジング１にて受けることが
できる。【００３４】この状態から、工具差し込み部43にドライ
バー等を差し込んで、図５に示すように、スラスト受け
部材29を周方向に回転させれば、仮想線で図示するよう
に、係合孔40の一側端縁49に、係合爪片41の外面が乗り
上げ、この外面に案内されて、スラスト受け部材29の回
転と共に、係合爪片41が、内径方向に逃げて行き係合孔
40から離脱するので、スラスト受け部材29を、基端軸心
孔31から簡単に抜き出すことができる。【００３５】このようにして、円筒部３に対してスラス
ト受け部材29を簡単に脱着できるので、ファン装置の部
品交換やリワークが容易となる。また、すべり軸受21
に、油Ｒを簡単に補充することができる。【００３６】また、図１に示すように、スラスト受け部
材29は、Ｏリング等のシール部材50を介して円筒部３に
固定される。【００３７】即ち、シール部材50は、基端軸心孔31の先
端内周面と、基端軸心孔31と中間軸心孔30とをつなぐ段
付状端面51と、スラスト受け部材29の周壁部37の先端面
と、すべり軸受21のカバー部材23の外周面との間に密封
状に介装される。【００３８】これにより、円筒部３に対するすべり軸受
21のガタツキが防止される。また、圧入から解放され
て、ファン装置の組立が容易となり、円筒部３の変形が
未然に防止できる。【００３９】しかも、スラスト受け部材29の係合爪片41
を一層確実に係合孔40に係止できて、そのガタツキを防
止でき、かつ、すべり軸受21に含油される油Ｒの外部へ
の漏れを防止して、シャフト20、すべり軸受21等の耐久
性を向上させることができる。【００４０】次に、図６は、すべり軸受21を、薄肉円筒
状内スリーブ52と、内スリーブ52に外嵌状に固定される
円筒状スリーブ体22と、スリーブ体22の外周面に被覆さ
れた薄肉円筒状カバー部材23と、から構成した場合を示
し、この場合、内スリーブ52には、スリーブ体22と配合
を相違させた鉄−銅系の焼結合金であって耐摩耗性を高
めたものが用いられる。【００４１】また、図７は、すべり軸受21を、円筒状ス
リーブ体53と、スリーブ体53に内嵌状に固定される一対
の短円筒状内スリーブ54，54と、から構成した場合を示
している。【００４２】このスリーブ体53には、耐摩耗性を有する
鉄−銅系の焼結合金が用いられ、内スリーブ54には、ス
リーブ体53と配合を相違させた鉄−銅系の焼結合金であ
って耐摩耗性を高めたものが用いられる。【００４３】さらに、スラスト受け部材29の周壁部37の
先端外周縁には、段付部55が形成され、この段付部55
と、スリーブ体53の基端面取部56と、基端軸心孔31と中
間軸心孔30とをつなぐテーパ内面57と、基端軸心孔31の
先端内周面との間に、シール部材50が密封状に介装され
る。【００４４】この場合、すべり軸受21は、シール部材50
を介して、スラスト受け部材29にて円筒部３に固定さ
れ、すべり軸受21及びスラスト受け部材29等のガタツキ
や、すべり軸受21からの油漏れが防止される。【００４５】また、図７と図８に示すように、円筒部３
の先端内鍔部32の内周面33と、ロータ15の短円筒部58の
基端外周面59とは、微小間隙をもって対面して、ラビリ
ンスシール溝34を形成しており、すべり軸受21から外部
への油漏れが防止される。また、先端内鍔部32に形成さ
れた軸方向凹周溝60は油戻しとして機能する。【００４６】なお、本発明は上述の実施例に限定され
ず、本発明の要旨を逸脱しない範囲で設計変更自由であ
る。【００４７】例えば、図９と図10に示すように、係合爪
片41が径方向に弾性変形可能なように、周壁部37の一部
を切欠いて逃げ部61を設け、係合爪片41が円筒部３の係
合孔40に係脱可能なように構成するも自由である。【００４８】また、図11に示すように、係合爪片41が径
方向に弾性変形可能なように、係合爪片41の基端部を残
して、その周囲にスリット62を入れたものとして構成す
るも自由である。【００４９】【発明の効果】本発明は上述の如く構成されているの
で、次に記載するような著大な効果を奏する。【００５０】本発明のファン装置では、安価なすべり軸
受21を用いることができるので、コスト低減を図り得え
る。【００５１】しかも、スラスト受け部材29を、ハウジン
グ１の円筒部３の基端側内周面に挿入して押し込むだけ
で、係合爪片41が係合孔40に係止し、該スラスト受け部
材29にて、すべり軸受21を、円筒部３先端の軸内方向端
面42に押圧して固定することができ、組付けが簡単に行
える。【００５２】また、工具差し込み部43にドライバー等を
差し込んで周方向に回転させれば、係合孔40から係合爪
片41が離脱し、スラスト受け部材29を、上記円筒部３か
ら抜き出すことができ、ファン装置の部品交換やリワー
クが容易に行える。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan device. 2. Description of the Related Art In a fan device having a housing to which a stator is fixed and a rotor with blades pivotally supported by a shaft via a shaft, conventionally, a fan unit having a cylindrical portion provided upright on the housing is conventionally used. The shaft was rotatably pivoted on the inner peripheral surface via a bearing. [0003] However, the cost of the bearing is high because the bearing is expensive.
Disassembly was troublesome, and replacement of parts was not easy. Accordingly, an object of the present invention is to solve the above-mentioned conventional problems and to provide a fan device which is easy to assemble and can be manufactured at low cost. [0005] In order to achieve the above object, there is provided a fan device including a housing to which a stator is fixed, and a bladed rotor pivotally supported on the housing via a shaft. A thrust receiving member that rotatably supports a shaft on the inner peripheral surface of the cylindrical portion of the housing via a slide bearing and receives a thrust force by slidingly contacting the base end surface of the shaft is attached to the base of the cylindrical portion. An engaging claw piece which is fitted into an end inner peripheral surface, and which can resiliently engage and disengage with an engaging hole formed in a proximal inner peripheral surface of the cylindrical portion is provided on an outer periphery of the thrust receiving member. By engaging the engaging claw of the thrust receiving member with the engaging hole of the cylindrical portion in a state where the slide bearing is pressed against the axial inward end surface of the tip of the cylindrical portion by the thrust receiving member, Thrust bearing member and plain bearing are circled The thrust receiving member is provided with a detachable tool insertion portion for applying a rotational torque to the thrust receiving member to detach the engaging claw piece from the engaging hole on the base end surface of the thrust receiving member. . When the thrust receiving member is inserted into the inner peripheral surface on the base end side of the cylindrical portion of the housing and pushed in, the engaging claw is locked in the engaging hole, and the slide bearing is connected to the cylindrical portion. The thrust receiving member can be pressed and fixed to the end face in the axial direction with the thrust receiving member, and the thrust receiving member can slide against the base end face of the shaft to receive the thrust force. From this state, if a screwdriver or the like is inserted into the tool insertion portion and rotated in the circumferential direction, the engaging claw pieces
Since the member gets on the inner peripheral surface on the base end side of the cylindrical portion and separates from the engagement hole, the thrust receiving member is pulled out from the inner peripheral surface on the base end side, and disassembly for component replacement or the like can be easily performed. The present invention will be described below in detail with reference to the drawings showing embodiments. FIG. 1 illustrates a cross-sectional view of a fan device according to the present invention. Reference numeral 1 denotes a housing made of plastic or the like.
It has a cylindrical portion 3 erected on the support portion 2. Reference numeral 4 denotes a stator.
The stator coil 8 is wound around the stator core 5 via a pair of insulators 6 and 7. The stator 4 is externally fitted to the cylindrical portion 3,
An elastic protrusion 10 protruding from a tip end cylindrical portion 9 of the insulator 6.
Is locked resiliently by engaging a concave portion 11 formed on the outer peripheral surface of the distal end of the cylindrical portion 3. The hanging piece of one insulator 7
One end of a terminal 13 is connected to the circuit board 14 via 12, and the other end of the terminal 13 is connected to the stator coil 8. The circuit board 14 is fixed to the housing 1. Reference numeral 15 denotes a bowl-shaped rotor. A plurality of blades 16 project from an outer peripheral surface of the rotor 15. In addition, rotor 15
The rotor magnet 18 is fixed to the inner peripheral surface of the rotor magnet 18 via an annular yoke 17, and the outer peripheral surface of the stator core 5 and the inner peripheral surface of the rotor magnet 18 face each other with a small gap. A shaft hole 19 is provided in the center hole 19 of the rotor 15.
20 tips are fixed. The shaft 20 is rotatably supported on the inner peripheral surface of the cylindrical portion 3 via a slide bearing 21, and a retaining ring 27 is attached to a base end thereof. Then, the rotor 15 is rotated by the control current flowing through the stator coil 8 via the circuit board 14, and the air is blown by the blades 16. The sliding bearing 21 is composed of the cylindrical sleeve member 22 and the thin cylindrical cover member 23 covering the outer peripheral surface of the sleeve member 22. The sleeve member 22 has wear resistance. An iron-copper based sintered alloy is used. The sleeve body 22 has a concave peripheral portion 24 that opens in the outer radial direction. The cover member 23 has two small through holes 25 corresponding to the concave peripheral portion 24 in the circumferential direction. You. One small through hole is formed in the annular oil vacant space 26 formed by the concave peripheral portion 24 and the inner peripheral surface of the cover member 23.
The oil R is injected and retained via 25. At this time, the other small through-hole 25 becomes an exhaust hole. The small through hole 25 has a diameter such that the oil R injected into the vacant space 26 does not easily leak when the fan is assembled.
Is formed. [0020] In this case, the oil R is previously supplied to the sliding bearing.
Since the sliding bearing 21 can be mounted on the inner peripheral surface of the cylindrical portion 3 after the oil is injected into the cylindrical portion 3, there is an advantage that the assembling operation is easier than in the case where oil is injected after assembling the fan. In addition, since a sufficient amount of oil R is held in the vacant space 26, the sliding bearing 21 does not run out of oil even when used for a long time, and the durability of the shaft 20, the sliding bearing 21 and the like is improved. There is also. The cylindrical portion 3 has an inner flange portion 32 having an L-shaped cross section and an intermediate shaft hole 30 into which the slide bearing 21 is inserted.
And a thrust receiving member having a diameter larger than the intermediate shaft hole 30.
And a proximal shaft hole 31 into which 29 is fitted. The shaft 20 is inserted into the inner peripheral surface 33 of the distal end inner flange portion 32, and oil leakage from the sliding bearing 21 to the outside is caused by the inner peripheral surface 33 facing with a small gap and the outer peripheral surface of the shaft 20. A labyrinth seal groove 34 is formed to prevent this. Next, the thrust receiving member 29 is made of a fitting body 35 integrally formed of a resin material such as polybutylene terephthalate, acrylonitrile / butadiene styrene copolymer, or polypropylene, and a low friction material made of a polyphenylene sulphite resin composite material. A wear-resistant support 36; The fitting body 35 has a cylindrical peripheral wall portion 37 that can be fitted in the base shaft hole 31, a bowl-shaped central holding portion 38 in which the support body 36 is held in a fitted state, and a peripheral wall portion 37. And a tapered connecting portion 39 connecting the central holding portion 38 to the base holding surface of the central holding portion 38. A detachable tool insertion portion 43 for applying a rotational torque to the thrust receiving member 29 is recessed in the base end surface. . The tool insertion portion 43 is formed in various shapes such as a plus, hexagon, and minus, as shown in FIGS. 2A, 2B, and 2C, corresponding to the tip shape of a tool such as a screwdriver. . As shown in FIGS. 1 and 3, an engaging claw piece which can be resiliently disengaged from a rectangular engaging hole 40 formed on the inner peripheral surface of the base shaft hole 31. 41 protrudes from the outer periphery of the peripheral wall portion 37. In the illustrated example, the engaging hole 40 is formed in the base end of the cylindrical portion 3 in a penetrating manner, and the engaging hole 40 and the corresponding engaging claw piece 41 are respectively formed in the circumferential direction. A plurality is formed in the direction. Further, axial slits 44, 44 are formed along the side edges 46, 46 of the engagement claw 41, and the hanging piece 45 including the engagement claw 41 is formed in a radial direction. Elastically deformable. The engaging claw 41 gradually projects outward (from the outer peripheral surface of the peripheral wall portion 37) from the side edge portions 46, 46 to the central portion 47, and from the front end portion (upward in the figure). It is formed so as to gradually protrude outward toward the base end (below the figure). The thrust receiving member 29 is inserted into the base shaft hole 31.
4 and pushed in, as shown by the phantom line in FIG. 4, the engaging claw piece 41 rides on the proximal shaft hole 31 and once escapes in the inner diameter direction, and then engages as shown by the solid line. Dovetail piece 41
However, when they are aligned with the engagement holes 40, they are restored in the outer diameter direction and locked. As a result, as shown in FIG. 1, the sliding bearing 21 is formed on the stepped surface 48 of the peripheral wall 37 of the thrust receiving member 29.
Can be pressed and fixed to the axial inward end surface 42 of the distal end inner flange portion 32. Further, the distal end surface of the support 36 is
The thrust force can be received by the housing 1 via the thrust receiving member 29. In this state, a driver or the like is inserted into the tool insertion portion 43 and the thrust receiving member 29 is rotated in the circumferential direction as shown in FIG. The outer surface of the engaging claw piece 41 rides on one side edge 49, and is guided by this outer surface, and with the rotation of the thrust receiving member 29, the engaging claw piece 41 escapes in the inner diameter direction and goes into the engagement hole.
Since the thrust receiving member 29 is separated from the base shaft hole 31, the thrust receiving member 29 can be easily pulled out from the base shaft hole 31. In this manner, the thrust receiving member 29 can be easily attached to and detached from the cylindrical portion 3, so that replacement of parts and rework of the fan device can be facilitated. In addition, sliding bearing 21
In addition, the oil R can be easily replenished. As shown in FIG. 1, the thrust receiving member 29 is fixed to the cylindrical portion 3 via a sealing member 50 such as an O-ring. That is, the seal member 50 includes the inner peripheral surface of the distal end of the proximal shaft hole 31, the stepped end surface 51 connecting the proximal shaft hole 31 and the intermediate shaft hole 30, and the thrust receiving member 29. The outer peripheral surface of the cover member 23 of the sliding bearing 21 is hermetically interposed between the distal end surface of the peripheral wall portion 37 and the outer peripheral surface of the cover member 23 of the plain bearing 21. Thus, the sliding bearing with respect to the cylindrical portion 3
21 rattling is prevented. Further, since the fan device is released from the press-fitting, the assembly of the fan device is facilitated, and the deformation of the cylindrical portion 3 can be prevented. Moreover, the engagement pawls 41 of the thrust receiving member 29
Can be more reliably locked in the engagement hole 40 to prevent the rattling thereof, and prevent the oil R impregnated in the sliding bearing 21 from leaking to the outside, so that the durability of the shaft 20, the sliding bearing 21 and the like can be improved. Performance can be improved. FIG. 6 shows the sliding bearing 21 covered with a thin-walled cylindrical inner sleeve 52, a cylindrical sleeve body 22 fixed to the inner sleeve 52 so as to be fitted externally, and an outer peripheral surface of the sleeve body 22. In this case, the inner sleeve 52 is made of an iron-copper sintered alloy having a different composition from that of the sleeve body 22 to improve wear resistance. Is used. FIG. 7 shows a case in which the sliding bearing 21 is composed of a cylindrical sleeve body 53 and a pair of short cylindrical inner sleeves 54, 54 fixed to the sleeve body 53 so as to be fitted therein. ing. The sleeve 53 is made of an iron-copper sintered alloy having wear resistance. The inner sleeve 54 is made of an iron-copper sintered alloy having a different composition from the sleeve 53. What has improved abrasion resistance is used. Further, a stepped portion 55 is formed on the outer peripheral edge of the distal end of the peripheral wall portion 37 of the thrust receiving member 29, and this stepped portion 55 is formed.
A seal is formed between a base chamfered portion 56 of the sleeve body 53, a tapered inner surface 57 connecting the base shaft hole 31 and the intermediate shaft hole 30, and a tip inner peripheral surface of the base shaft hole 31. The member 50 is interposed in a sealed manner. In this case, the sliding bearing 21 includes a sealing member 50
, And is fixed to the cylindrical portion 3 by the thrust receiving member 29 to prevent rattling of the sliding bearing 21 and the thrust receiving member 29 and oil leakage from the sliding bearing 21. As shown in FIG. 7 and FIG.
The inner peripheral surface 33 of the distal end inner flange portion 32 and the proximal outer peripheral surface 59 of the short cylindrical portion 58 of the rotor 15 face each other with a minute gap to form a labyrinth seal groove 34, and the sliding bearing 21 Oil leakage to the outside is prevented. Also, the axial concave groove 60 formed in the distal end inner flange portion 32 functions as oil return. It should be noted that the present invention is not limited to the above-described embodiment, and the design can be freely changed without departing from the gist of the present invention. For example, as shown in FIGS. 9 and 10, a part of the peripheral wall portion 37 is cut out and a relief portion 61 is provided so that the engaging claw 41 can be elastically deformed in the radial direction. It is also free to configure so that the 41 can be disengaged from the engaging hole 40 of the cylindrical portion 3. Further, as shown in FIG. 11, a slit 62 is formed around the engaging claw 41 except for the base end thereof so that the engaging claw 41 can be elastically deformed in the radial direction. It is also free to be configured as Since the present invention is configured as described above, the following significant effects can be obtained. In the fan device of the present invention, inexpensive sliding bearings 21 can be used, so that the cost can be reduced. Further, by simply inserting and pushing the thrust receiving member 29 into the inner peripheral surface on the base end side of the cylindrical portion 3 of the housing 1, the engaging claw piece 41 is locked in the engaging hole 40, and the thrust receiving member 29 is engaged. With the member 29, the sliding bearing 21 can be pressed against and fixed to the axially inner end surface 42 at the tip of the cylindrical portion 3, and assembly can be performed easily. When a screwdriver or the like is inserted into the tool insertion portion 43 and rotated in the circumferential direction, the engagement claw 41 is disengaged from the engagement hole 40, and the thrust receiving member 29 is pulled out of the cylindrical portion 3. This makes it easy to replace parts and rework the fan device.

【図面の簡単な説明】【図１】本発明の一実施例を示す断面正面図である。【図２】工具差し込み部の形状を示す平面図である。【図３】要部分解斜視図である。【図４】要部拡大断面側面図である。【図５】要部拡大断面平面図である。【図６】すべり軸受の変形例を示す断面図である。【図７】他の実施例を示す断面図である。【図８】要部拡大断面図である。【図９】スラスト受け部材の変形例を示す要部斜視図で
ある。【図10】要部拡大断面図である。【図11】スラスト受け部材の他の変形例を示す要部斜視
図である。【符号の説明】１ハウジング３円筒部４ステータ 15 ロータ 20 シャフト 21 すべり軸受 28 基端面 29 スラスト受け部材 40 係合孔 41 係合爪片 42 軸内方向端面 43 工具差し込み部BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional front view showing an embodiment of the present invention. FIG. 2 is a plan view showing a shape of a tool insertion portion. FIG. 3 is an exploded perspective view of a main part. FIG. 4 is an enlarged sectional side view of a main part. FIG. 5 is an enlarged sectional plan view of a main part. FIG. 6 is a sectional view showing a modified example of the sliding bearing. FIG. 7 is a sectional view showing another embodiment. FIG. 8 is an enlarged sectional view of a main part. FIG. 9 is a perspective view of a main part showing a modification of the thrust receiving member. FIG. 10 is an enlarged sectional view of a main part. FIG. 11 is an essential part perspective view showing another modification of the thrust receiving member. [Description of Signs] 1 Housing 3 Cylindrical part 4 Stator 15 Rotor 20 Shaft 21 Slide bearing 28 Base end face 29 Thrust receiving member 40 Engagement hole 41 Engagement claw piece 42 In-axis end face 43 Tool insertion part

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.⁷，ＤＢ名) H02K 7/00 - 7/20 H02K 5/00 - 5/26 F16C 17/00 - 17/26 F16C 33/00 - 33/28 F16C 35/00 - 43/08 ──────────────────────────────────────────────────続き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K ⁷ /00-7/20 H02K 5/00-5/26 F16C 17/00-17/26 F16C 33 / 00-33/28 F16C 35/00-43/08

Claims

(1) A fan device comprising: a housing to which a stator is fixed; and a rotor with blades pivotally supported on the housing via a shaft. A thrust receiving member 29 that rotatably supports the shaft 20 on the inner peripheral surface of the cylindrical portion 3 of the housing 1 via a slide bearing 21 and slides on a base end surface 28 of the shaft 20 to receive a thrust force. , Fitted into the inner peripheral surface on the base end side of the cylindrical portion 3,
On the outer periphery of the thrust receiving member 29, an engaging claw piece 41 which can be resiliently engaged with and disengaged from an engaging hole 40 formed in the inner peripheral surface on the base end side of the cylindrical portion 3 is projected. With the sliding bearing 21 pressed against the axially inner end face 42 at the tip of the cylindrical portion 3 by the member 29, the engaging claw 41 of the thrust receiving member 29 is engaged with the engaging hole 40 of the cylindrical portion 3. By doing so, the thrust receiving member 29 and the slide bearing 21 are fixed to the cylindrical portion 3, and the engaging claw 41 is engaged with the base end surface of the thrust receiving member 29 by applying a rotational torque to the thrust receiving member 29. A fan device, wherein a detachable tool insertion portion 43 for detaching from the hole 40 is formed.