JP3879451B2 - Electric motor - Google Patents
Electric motor Download PDFInfo
- Publication number
- JP3879451B2 JP3879451B2 JP2001221113A JP2001221113A JP3879451B2 JP 3879451 B2 JP3879451 B2 JP 3879451B2 JP 2001221113 A JP2001221113 A JP 2001221113A JP 2001221113 A JP2001221113 A JP 2001221113A JP 3879451 B2 JP3879451 B2 JP 3879451B2
- Authority
- JP
- Japan
- Prior art keywords
- bearing holder
- bearing
- ball bearing
- bracket
- fixed
- 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
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Classifications
-
- 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
- F16C35/042—Housings for rolling element bearings for rotary movement
- F16C35/045—Housings for rolling element bearings for rotary movement with a radial flange to mount the housing
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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
- 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
- F16C35/07—Fixing them on the shaft or housing with interposition of an element
- F16C35/077—Fixing them on the shaft or housing with interposition of an element between housing and outer race ring
-
- 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
- F16C2226/60—Positive connections with threaded parts, e.g. bolt and nut 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
- Motor Or Generator Frames (AREA)
- Reciprocating Pumps (AREA)
- Support Of The Bearing (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、機器の駆動源となる電動機、特に回転軸にラジアル方向の負荷がかかる玉軸受のクリープ防止に関するものである。
【0002】
【従来の技術】
従来、玉軸受を用いた電動機には、玉軸受の寿命を確保するため軸方向に適正な与圧をかけている。このため、外輪と軸受ハウジング(または内輪と回転軸)との間にわずかな隙間を設けてルーズにしていた。
【0003】
そして、電動機の駆動時に出力軸にラジアル方向の負荷がかかると、外輪外径と軸受ハウジング内径(または内輪内径と回転軸外径)の寸法差からすべり現象が発生して摩耗が生じるためクリープ対策がとられていた。
【0004】
一般的には、玉軸受の内輪と回転軸とを圧入嵌合、一方の玉軸受の外輪とハウジングとにわずかな隙間を設けて外輪をルーズにし、その外輪にバネで軸方向に与圧をかけていた。
【0005】
【発明が解決しようとする課題】
しかしながら、従来のように内輪を回転軸に圧入または接着、片方の外輪をルーズにしたバネによる与圧構造では、玉軸受外輪を確実に固定するのが困難であり、完全にクリープを防止することができなかった。
【0006】
そして、ダイアフラムポンプのように電動機にラジアル方向のアンバランス荷重が加わる用途に使用すると特にクリープが発生しやすかった。
【0007】
また、両出力軸タイプの電動機において、両方の玉軸受外輪を軸受ハウジングに固定する構造にすると、玉軸受に与圧をかけることが困難であった。
【0008】
そこで、内輪と回転軸との間に隙間を設ければ与圧をかけることは可能になるが、今度は玉軸受内輪と回転軸の間でクリープが発生することになり、玉軸受に与圧をかけるとクリープを避けることができなかった。
【0009】
本発明は、上記従来の課題を解決するものであり、与圧をかけながら玉軸受のクリープを防止できる電動機を提供することを目的とする。
【0010】
【課題を解決するための手段】
上記の課題を解決するために本発明の電動機は、回転軸を玉軸受で両持ち支承する電動機において、与圧をかけながら玉軸受の外輪と軸受ホルダをネジ固定するもので、玉軸受の外輪を挿入係止する軸受ホルダと、この軸受ホルダを取り付けるブラケットと、前記軸受ホルダの外周ツバ部の肉厚より厚いスペーサと、前記軸受ホルダとスペーサとの段差間に押圧配設するバネワッシャとを備え、玉軸受の内輪を回転軸に圧入、外輪はビスを介して軸受ホルダに固定、この軸受ホルダをブラケットに対して前記スペーサとバネワッシャとで軸方向に移動可能となるようにネジ固定したもので、玉軸受のクリープを防止できる。
【0011】
【発明の実施の形態】
上記の課題を解決するために請求項1記載の電動機は、回転軸を玉軸受で両持ち支承する電動機において、玉軸受の外輪を挿入係止する軸受ホルダと、この軸受ホルダを取り付けるブラケットと、前記軸受ホルダの外周ツバ部の肉厚より厚いスペーサと、前記軸受ホルダとスペーサとの段差間に押圧配設するバネワッシャとを備え、玉軸受の内輪を回転軸に圧入、外輪はビスを介して軸受ホルダに固定、この軸受ホルダをブラケットに対して前記スペーサとバネワッシャとを介してビスで固定して、与圧をかけながら玉軸受の外輪と軸受ホルダをネジ固定したもので、クリープを防止できる。
【0012】
また、請求項2記載の電動機は、内輪の圧入位置決めに回転軸の段部を利用したもので、玉軸受を軸方向に精度よく位置決めできる。
【0013】
また、請求項3記載の電動機は、軸受ホルダを両側に設け、片方の軸受ホルダはスペーサとバネワッシャを用いずにブラケットにビスで固定したもので、軸受構造を共用でき、両方の玉軸受外輪をビスで固定できる。
【0014】
【実施例】
以下、本発明の実施例について図面を参照して説明する。
【0015】
(実施例1)
図1は玉軸受外輪の固定構造を示すものである。
【0016】
図1(a)(b)において、11は軸受ホルダ、12は玉軸受、13は押え板、14は止めネジ、15はツバ部で、軸受ホルダ11の外周に3ヶ所設けている。
【0017】
そして、軸受ホルダ11の内周にルーズな状態で玉軸受12の外輪が挿入され、その外輪端面は押え板13と接触するように軸受ホルダ11端面より少し突出するように反対側の外輪端面を受けており、押え板13を軸受ホルダ11に止めネジ14で固定して軸受ホルダ完成品となる。
【0018】
次に、上述した軸受ホルダ完成品を用いた電動機の与圧構造を中心に説明する。
【0019】
図2において、21はブラケット、22は巻線を備えたステータ、23は回転軸でロータを備えている。24はスペーサ、25は波形のバネワッシャ、26はネジである。また、図3は与圧構造の要部を説明する拡大図であり、31はクリアランス、32は隙間、33は段差である。
【0020】
まず、ステータ22外周に両側からブラケット21を取り付けておく。そして図1で説明した軸受ホルダ完成品の玉軸受12内輪を回転軸23の段部まで圧入、軸受ホルダ完成品のツバ部15を一方のブラケット21にネジ26で3ヶ所固定する。さらに、もう一方の軸受ホルダ完成品の玉軸受12内輪を回転軸23の反対側の段部まで圧入する。
【0021】
そして、取り付けた軸受ホルダ完成品を介して与圧をかけるために、軸受ホルダのツバ部15の肉厚よりも厚いスペーサ24とバネワッシャ25を用いる。
【0022】
ところで、軸受ホルダ11とブラケット21との挿入部にはラジアル方向にわずかなクリアランス31を設けておく。また、内輪圧入後に軸受ホルダとブラケット21には軸線方向に確実に隙間32が得られるようにそれぞれ寸法設定している。
【0023】
そして、ツバ部15とスペーサ24間の段差33にバネワッシャ25を配設、ネジ26でツバ部15をブラケット21に固定する。
【0024】
このバネワッシャ25は押圧しないフリーの状態で段差33よりも高く設定、ネジ26はスペーサ24の高さで制限された分だけしか締め付けられないので玉軸受に過度の与圧をかけることはない。また、この押圧状態で適正与圧になるようにバネ圧を設定している。
【0025】
これにより、両玉軸受の内輪は回転軸に圧入固定、両玉軸受の外輪はネジ固定されるのでクリープが発生することはない。また、バネワッシャで適正な与圧をかけることができるので玉軸受の寿命を確保できる。
【0026】
なお、軸受ホルダ完成品はバネワッシャ側の片方だけでもよく、その場合、反対側は軸受ホルダを一体化したブラケットにして、その玉軸受外輪を固着すればよい。
【0027】
(実施例2)
実施例2は実施例1の電動機をダイアフラムポンプ駆動に応用した実施例である。
【0028】
図4(a)(b)において、41はクランク支持体、42はクランク軸、43は軸受、44はゴム製のダイアフラム、45は吸気口、46は排気口で、その先には逆流を防止する弁(図示せず)がある。
【0029】
電動機の回転軸に固定されたクランク支持体41は、クランク軸42に固定された軸受43の中心に対して偏芯した状態で取り付けており、電動機の回転軸が回転するとクランク軸42は往復運動する。これによりクランク軸42に取り付けたダイアフラム44が往復運動して気体を吸気口45から吸入して排気口46から排出する。
【0030】
このように、電動機は両玉軸受の内外輪を固定した状態で適正与圧をかけているので、回転軸に常時ラジアル方向のアンバランス荷重が加わるダイアフラムポンプに使用してもクリープを防止できる。
【0031】
【発明の効果】
上記の実施例から明らかなように、請求項1記載の発明によれば、与圧をかけながら玉軸受の内輪および外輪を固定しているのでクリープを防止できる。
【0032】
また、請求項2記載の発明によれば、上記請求項に加えて、玉軸受の位置決め精度確保が容易にできるため、適正与圧を確保しやすくなる。
【0033】
また、請求項3記載の発明によれば、軸受構造を共用でき、両玉軸受の外輪をビスで確実に固定できるのでクリープを防止できる。
【0034】
このように、両玉軸受の内輪および外輪を固定した状態で与圧をかけることができるので、クリープを防止した長寿命の電動機が得られる。
【図面の簡単な説明】
【図1】 (a)本発明の玉軸受外輪の固定構造を説明する断面図
(b)本発明の玉軸受外輪の固定構造を説明する平面図
【図2】 本発明の実施例1における電動機の断面図
【図3】 本発明の実施例1における要部の拡大図
【図4】 (a)本発明の実施例2におけるダイアフラムポンプの説明図
(b)本発明の実施例2におけるダイアフラムポンプと電動機の断面図
【符号の説明】
11 軸受ホルダ
12 玉軸受
13 押え板
14 止めネジ
15 ツバ部
21 ブラケット
22 ステータ
23 回転軸
24 スペーサ
25 バネワッシャ
26 ネジ
32 隙間
33 段差
44 ダイアフラム[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the prevention of creep of an electric motor serving as a drive source for equipment, particularly a ball bearing in which a radial load is applied to a rotating shaft.
[0002]
[Prior art]
Conventionally, an appropriate pressure is applied to an electric motor using a ball bearing in the axial direction in order to ensure the life of the ball bearing. For this reason, a slight gap is provided between the outer ring and the bearing housing (or the inner ring and the rotating shaft) to make it loose.
[0003]
And when a radial load is applied to the output shaft when driving the motor, a slip phenomenon occurs due to the difference in the outer ring outer diameter and the bearing housing inner diameter (or inner ring inner diameter and rotating shaft outer diameter), which causes wear. Was taken.
[0004]
In general, the inner ring of a ball bearing and a rotating shaft are press-fitted and fitted, and a slight gap is provided between the outer ring and housing of one ball bearing to loosen the outer ring, and the outer ring is pressurized in the axial direction with a spring. It was over.
[0005]
[Problems to be solved by the invention]
However, it is difficult to securely fix the outer ring of the ball bearing, and the creep is completely prevented with the conventional pressurizing structure using the spring with the inner ring being press-fitted or bonded to the rotating shaft and one outer ring being loose. I could not.
[0006]
And, when used for an application in which an unbalanced load in the radial direction is applied to the electric motor, such as a diaphragm pump, creep is particularly likely to occur.
[0007]
In addition, in both output shaft type electric motors, it is difficult to apply pressure to the ball bearings if both ball bearing outer rings are structured to be fixed to the bearing housing.
[0008]
Therefore, if a gap is provided between the inner ring and the rotating shaft, it is possible to apply pressure, but this time, creep occurs between the inner ring of the ball bearing and the rotating shaft, and the pressure is applied to the ball bearing. I couldn't avoid creep.
[0009]
The present invention solves the above-described conventional problems, and an object of the present invention is to provide an electric motor that can prevent creep of a ball bearing while applying pressure.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, an electric motor according to the present invention is a motor in which a rotating shaft is supported at both ends by a ball bearing, and an outer ring of a ball bearing and a bearing holder are screw-fixed while applying pressure. A bearing holder that inserts and locks the bearing holder, a bracket that attaches the bearing holder, a spacer that is thicker than the thickness of the outer peripheral flange of the bearing holder, and a spring washer that is pressed between the steps of the bearing holder and the spacer. The inner ring of the ball bearing is press-fitted into the rotating shaft, the outer ring is fixed to the bearing holder via a screw, and this bearing holder is fixed to the bracket with screws so that it can be moved in the axial direction by the spacer and the spring washer. Can prevent the ball bearing from creeping.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In order to solve the above-mentioned problem, the electric motor according to claim 1 is a motor in which a rotating shaft is supported at both ends by a ball bearing, a bearing holder for inserting and locking an outer ring of the ball bearing, a bracket for attaching the bearing holder, A spacer thicker than the thickness of the outer peripheral flange of the bearing holder, and a spring washer that is pressed between the bearing holder and the spacer. The inner ring of the ball bearing is press-fitted into the rotating shaft, and the outer ring is inserted through a screw. Fixed to the bearing holder, this bearing holder is fixed to the bracket with screws via the spacer and the spring washer, and the outer ring of the ball bearing and the bearing holder are fixed with screws while applying pressure, so that creep can be prevented. .
[0012]
According to a second aspect of the present invention, the step of the rotating shaft is used for press-fitting positioning of the inner ring, and the ball bearing can be accurately positioned in the axial direction.
[0013]
Further, the electric motor according to claim 3 is provided with bearing holders on both sides, and one of the bearing holders is fixed to the bracket with screws without using a spacer and a spring washer. Can be fixed with screws.
[0014]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
Example 1
FIG. 1 shows a ball bearing outer ring fixing structure.
[0016]
In FIGS. 1A and 1B, 11 is a bearing holder, 12 is a ball bearing, 13 is a retainer plate, 14 is a set screw, and 15 is a flange portion, and is provided at three locations on the outer periphery of the bearing holder 11.
[0017]
Then, the outer ring of the ball bearing 12 is inserted in a loose state on the inner periphery of the bearing holder 11, and the outer ring end surface on the opposite side is protruded slightly from the end surface of the bearing holder 11 so that the outer ring end surface contacts the
[0018]
Next, an explanation will be made focusing on the pressurizing structure of the electric motor using the above-described finished bearing holder.
[0019]
In FIG. 2, 21 is a bracket, 22 is a stator with windings, and 23 is a rotating shaft and a rotor. 24 is a spacer, 25 is a corrugated spring washer, and 26 is a screw. FIG. 3 is an enlarged view for explaining a main part of the pressurizing structure, in which 31 is a clearance, 32 is a gap, and 33 is a step.
[0020]
First, the
[0021]
And in order to apply a pressure through the attached bearing holder finished product, a
[0022]
By the way, a
[0023]
Then, a
[0024]
The
[0025]
As a result, the inner ring of both ball bearings is press-fitted and fixed to the rotating shaft, and the outer ring of both ball bearings is fixed by screws, so that creep does not occur. Further, since a proper pressure can be applied by the spring washer, the life of the ball bearing can be ensured.
[0026]
The finished bearing holder may be only one of the spring washer side. In this case, the opposite side may be a bracket integrated with the bearing holder, and the ball bearing outer ring may be fixed.
[0027]
(Example 2)
The second embodiment is an embodiment in which the electric motor of the first embodiment is applied to driving a diaphragm pump.
[0028]
4 (a) and 4 (b), 41 is a crank support body, 42 is a crankshaft, 43 is a bearing, 44 is a rubber diaphragm, 45 is an intake port, 46 is an exhaust port, and prevents backflow. There is a valve (not shown).
[0029]
The crank
[0030]
As described above, since the electric motor applies an appropriate pressure with the inner and outer rings of the ball bearings being fixed, creep can be prevented even when used in a diaphragm pump in which a radial unbalance load is constantly applied to the rotating shaft.
[0031]
【The invention's effect】
As is apparent from the above-described embodiment, according to the first aspect of the present invention, since the inner ring and the outer ring of the ball bearing are fixed while applying pressure, creep can be prevented.
[0032]
Further, according to the invention of claim 2 , in addition to the above-mentioned claim, it is easy to ensure the positioning accuracy of the ball bearing, so that it is easy to ensure proper pressurization.
[0033]
Further, according to the third aspect of the present invention, can be shared bearings structure, can prevent creep because of both ball bearing outer ring can be securely fixed with screws.
[0034]
In this way, pressure can be applied while the inner and outer rings of the ball bearings are fixed, so that a long-life motor that prevents creep can be obtained.
[Brief description of the drawings]
1A is a cross-sectional view illustrating a ball bearing outer ring fixing structure of the present invention. FIG. 1B is a plan view illustrating a ball bearing outer ring fixing structure of the present invention. FIG. 2 is a motor according to a first embodiment of the present invention. FIG. 3 is an enlarged view of a main part in Embodiment 1 of the present invention. FIG. 4 is a diagram for explaining a diaphragm pump in Embodiment 2 of the present invention. (B) A diaphragm pump in Embodiment 2 of the present invention. Sectional view of motor and motor 【Explanation of symbols】
DESCRIPTION OF SYMBOLS 11
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2001221113A JP3879451B2 (en) | 2001-07-23 | 2001-07-23 | Electric motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001221113A JP3879451B2 (en) | 2001-07-23 | 2001-07-23 | Electric motor |
Publications (2)
Publication Number | Publication Date |
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JP2003032958A JP2003032958A (en) | 2003-01-31 |
JP3879451B2 true JP3879451B2 (en) | 2007-02-14 |
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Application Number | Title | Priority Date | Filing Date |
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JP2001221113A Expired - Lifetime JP3879451B2 (en) | 2001-07-23 | 2001-07-23 | Electric motor |
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JP (1) | JP3879451B2 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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DE102004054457B3 (en) * | 2004-11-11 | 2006-02-09 | Ab Skf | Multi-purpose machine and automotive roller bearing is retained concealed within a surrounding housing by a spring locking ring |
JP4856509B2 (en) * | 2006-09-29 | 2012-01-18 | 本田技研工業株式会社 | Transmission |
ES2660376T3 (en) * | 2015-03-18 | 2018-03-22 | Roller Bearing Company Of America, Inc. | Bearing assembly that has an anti-rotation device |
ES2934069T3 (en) * | 2018-02-07 | 2023-02-16 | Timken Co | Roller seating device for tapered roller bearings |
JP2020162245A (en) * | 2019-03-26 | 2020-10-01 | 日本電産サンキョー株式会社 | motor |
DE102021205791A1 (en) * | 2021-06-08 | 2022-12-08 | Aktiebolaget Skf | floating bearing arrangement |
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