JP6795373B2 - Bearing unit and motor - Google Patents

Bearing unit and motor Download PDF

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Publication number
JP6795373B2
JP6795373B2 JP2016204224A JP2016204224A JP6795373B2 JP 6795373 B2 JP6795373 B2 JP 6795373B2 JP 2016204224 A JP2016204224 A JP 2016204224A JP 2016204224 A JP2016204224 A JP 2016204224A JP 6795373 B2 JP6795373 B2 JP 6795373B2
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oil
bearing
outer peripheral
storage portion
impregnated bearing
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JP2018066410A (en
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学 上田
学 上田
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Mabuchi Motor Co Ltd
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Mabuchi Motor Co Ltd
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Priority to JP2016204224A priority Critical patent/JP6795373B2/en
Priority to CN201710966323.XA priority patent/CN107956804B/en
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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
    • F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/103—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • 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)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Power Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
  • Motor Or Generator Frames (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Description

本発明は、シャフトを回転自在に支持する含油軸受を備えた軸受ユニット、および、この軸受ユニットが適用されたモータに関する。 The present invention relates to a bearing unit provided with an oil-impregnated bearing that rotatably supports a shaft, and a motor to which the bearing unit is applied.

事務機器や車載電装機器などに使用されるモータには、シャフトを回転自在に支持する軸受として、含油軸受が採用されることがある。含油軸受（以下「軸受」ともいう）は、相対的に摺動する二面間（すなわち、軸受内周面とシャフト外周面との間）に粘性油膜を介在させ、この油膜の圧力によってシャフトを支持する。この油（以下「軸受油」ともいう）は、焼結体である軸受の細孔内に含浸された潤滑油が、シャフトの回転による吸引力と軸受の温度上昇とによって表面に漏出したものである。なお、漏出した油を保持して含油軸受に戻す構成を持たせた軸受装置が提案されている（例えば特許文献１参照）。 Oil-impregnated bearings may be used as bearings that rotatably support the shaft in motors used in office equipment and in-vehicle electrical equipment. An oil-impregnated bearing (hereinafter, also referred to as a "bearing") has a viscous oil film interposed between two relatively sliding surfaces (that is, between the inner peripheral surface of the bearing and the outer peripheral surface of the shaft), and the shaft is pressed by the pressure of this oil film. To support. This oil (hereinafter also referred to as "bearing oil") is the lubricating oil impregnated in the pores of the bearing, which is a sintered body, leaked to the surface due to the suction force due to the rotation of the shaft and the temperature rise of the bearing. is there. It should be noted that a bearing device having a configuration in which the leaked oil is retained and returned to the oil-impregnated bearing has been proposed (see, for example, Patent Document 1).

特許第２９０３６６４号公報Japanese Patent No. 2903664

ところで、軸受から漏出した油は、軸受の表面に接していれば自然と細孔内に吸収され、再び粘性油膜の形成に寄与する。しかし、軸受から漏出した油は、モータの振動やシャフトの回転力などによって周囲に飛散することがある。軸受から飛散した油は、そのままでは細孔内に吸収されないため、軸受油の減少を招く。軸受油が減少すると、軸受またはシャフトの摩耗や回転負荷の増大を引き起こし、モータの品質低下や寿命低下に繋がるおそれがある。 By the way, the oil leaked from the bearing is naturally absorbed in the pores if it is in contact with the surface of the bearing, and contributes to the formation of the viscous oil film again. However, the oil leaked from the bearing may be scattered around due to the vibration of the motor or the rotational force of the shaft. The oil scattered from the bearing is not absorbed into the pores as it is, which causes a decrease in the bearing oil. When the amount of bearing oil is reduced, the bearing or shaft is worn and the rotational load is increased, which may lead to deterioration of motor quality and life.

本件は、このような課題に鑑み案出されたもので、含油軸受を備えた軸受ユニットにおいて、油を回収して含油軸受に戻すことで軸受油の減少を抑制することを目的の一つとする。また、軸受油の減少を抑制できるようにしたモータを提供することも目的の一つとする。なお、これらの目的に限らず、後述する発明を実施するための形態に示す各構成により導かれる作用効果であって、従来の技術によっては得られない作用効果を奏することも本件の他の目的である。 This case was devised in view of such problems, and one of the purposes is to suppress the decrease in bearing oil by recovering the oil and returning it to the oil-impregnated bearing in the bearing unit equipped with the oil-impregnated bearing. .. Another object of the present invention is to provide a motor capable of suppressing a decrease in bearing oil. It should be noted that the other purpose of the present invention is not limited to these purposes, but is an action and effect derived by each configuration shown in the embodiment for carrying out the invention described later, and exerts an action and effect that cannot be obtained by the conventional technique. Is.

（１）ここで開示する軸受ユニットは、シャフトを回転自在に支持する含油軸受と、前記含油軸受が固定される有底筒状のケースと、を具備した軸受ユニットであって、前記ケースの底部に凹設されるとともに中央に貫通孔を有し、前記含油軸受を収容する収容部と、前記収容部の内周面に突条に形成されるとともに周方向に互いに離隔して配置され、前記含油軸受を支持する複数のリブと、前記収容部の開口側の径方向外側において前記底部に凹設された環状の溝であって、前記収容部の前記内周面よりも径方向外側に立設された外周壁と、径方向かつ周方向に広がる保持面とを有し、前記含油軸受から飛散した油を回収するための第一貯油部と、隣接する前記リブ間に位置し、前記含油軸受の外周面と前記収容部の前記内周面との間に設けられた空隙と、前記第一貯油部と前記空隙とを連通する放射状の溝である還流路と、前記収容部の前記内周面と連続した内面を持ち、前記保持面よりも前記収容部の前記開口側へ突設された複数の突起部と、を備え、前記複数の突起部は、前記第一貯油部の径方向内側において周方向に互いに離隔して配置されるとともに、前記収容部の前記内周面に形成された前記リブの延長線上に位置する前記内面には前記リブが連続して形成され、前記還流路は、隣接する前記突起部の間に位置することを特徴としている。 (1) The bearing unit disclosed here is a bearing unit including an oil-impregnated bearing that rotatably supports a shaft and a bottomed tubular case to which the oil-impregnated bearing is fixed, and the bottom of the case. recessed into has Rutotomoni center through hole, a housing portion for housing the oil-impregnated bearing, are spaced apart from each other in the circumferential direction is formed in a protrusion on the inner peripheral surface of the receiving portion, wherein a plurality of ribs for supporting the oil-impregnated bearing, a annular groove which is recessed in Oite the bottom radially outside the opening side of the receiving portion, the radially outer side than the inner peripheral surface of the housing part It has an outer peripheral wall erected in the bearing and a holding surface extending in the radial and circumferential directions, and is located between the first oil storage portion for recovering the oil scattered from the oil-impregnated bearing and the adjacent ribs. A gap provided between the outer peripheral surface of the oil-impregnated bearing and the inner peripheral surface of the accommodating portion , a return path which is a radial groove communicating the first oil storage portion and the void, and the accommodating portion. A plurality of protrusions having an inner surface continuous with the inner peripheral surface and projecting from the holding surface toward the opening side of the storage portion, and the plurality of protrusions are provided with the first oil storage portion. The ribs are continuously formed on the inner surface located on the extension line of the ribs formed on the inner peripheral surface of the accommodating portion while being arranged apart from each other in the circumferential direction on the inner side in the radial direction. The return path is characterized in that it is located between the adjacent protrusions .

（２）前記軸受ユニットは、前記含油軸受よりも前記ケースの開口側に配置されたコードホイールと、前記コードホイールと前記含油軸受との間に配置されたワッシャと、をさらに具備し、前記コードホイール及び前記ワッシャの少なくとも一方は、前記第一貯油部の前記外周壁よりも径方向内側において径方向かつ周方向に延設され、前記飛散した油を受け止める受け部として機能することが好ましい。
（３）前記第一貯油部の前記外周壁よりも径方向内側において、前記受け部から軸方向かつ周方向に延設され、前記飛散した油を受け止める飛散防止壁を備えていることが好ましい。
（４）前記飛散防止壁は、前記第一貯油部の前記外周壁とは逆方向から設けられて前記保持面との間に隙間を形成するとともに、径方向視した場合に前記外周壁の一部と重なることが好ましい。 (2) The bearing unit further includes a cord wheel arranged on the opening side of the case with respect to the oil-impregnated bearing, and a washer arranged between the cord wheel and the oil-impregnated bearing, and the cord is further provided. at least one of the wheels and the washer, the being said extending radially inward from the outer peripheral wall in the radial direction and the circumferential direction of the first oil storage portion, Rukoto to function as receiving unit that receives the scattered oil is preferred.
(3) It is preferable that the first oil storage portion is provided with a scattering prevention wall extending in the axial direction and the circumferential direction from the receiving portion on the inner side in the radial direction with respect to the outer peripheral wall to receive the scattered oil.
(4) The shatterproof wall is provided from the direction opposite to the outer peripheral wall of the first oil storage portion to form a gap between the first oil storage portion and the holding surface, and is one of the outer peripheral walls when viewed in the radial direction. It is preferable that it overlaps with the part.

（５）前記収容部の底面における外周部に凹設されるとともに前記空隙と連通し、前記含油軸受から漏出した油を回収するための第二貯油部を備えていることが好ましい。
（６）前記ケースは、少なくとも前記第一貯油部および前記還流路に撥油処理が施された撥油面を有することが好ましい。 ( 5 ) It is preferable to have a second oil storage portion which is recessed in the outer peripheral portion on the bottom surface of the accommodating portion and communicates with the void to recover the oil leaked from the oil-impregnated bearing.
( 6 ) The case preferably has an oil-repellent surface on which at least the first oil storage portion and the reflux path are subjected to an oil-repellent treatment.

（７）ここで開示するモータは、ハウジングに内蔵されたステータおよびロータを具備したモータであって、前記ロータと一体回転するシャフトを回転自在に支持する軸受と、前記ハウジングに結合されるとともに前記軸受が固定される有底筒状のエンドベルとに対して、上記の（１）〜（６）のいずれか一つの軸受ユニットが適用されたことを特徴としている。 ( 7 ) The motor disclosed here is a motor including a stator and a rotor built in a housing, and is coupled to the housing with a bearing that rotatably supports a shaft that rotates integrally with the rotor. It is characterized in that any one of the above-mentioned bearing units (1) to ( 6 ) is applied to the bottomed tubular end bell to which the bearing is fixed.

開示の軸受ユニットによれば、含油軸受から飛散した油を第一貯油部および還流路を介して空隙へと導くことで回収し、含油軸受に吸収させる（戻す）ことができる。これにより、軸受油の減少を抑制することができる。
また、開示のモータによれば、飛散した油を回収して含油軸受に戻すことができるため、軸受油の減少を抑制することができ、モータの品質や寿命を向上させることができる。 According to the disclosed bearing unit, the oil scattered from the oil-impregnated bearing can be recovered by guiding the oil scattered from the oil-impregnated bearing to the void through the first oil storage unit and the reflux path, and can be absorbed (returned) by the oil-impregnated bearing. As a result, the decrease in bearing oil can be suppressed.
Further, according to the disclosed motor, since the scattered oil can be recovered and returned to the oil-impregnated bearing, the decrease of the bearing oil can be suppressed, and the quality and life of the motor can be improved.

実施形態に係るモータの分解斜視図である。It is an exploded perspective view of the motor which concerns on embodiment. 実施形態に係る軸受ユニットを分解して示す軸方向断面図である。It is an axial sectional view which shows by disassembling the bearing unit which concerns on embodiment. （ａ）は実施形態に係る軸受ユニットの軸方向断面図であり、（ｂ）は図３（ａ）のＡ部を拡大して示す斜視図である。(A) is an axial sectional view of the bearing unit according to the embodiment, and (b) is an enlarged perspective view showing a part A of FIG. 3 (a). 油の動きを説明するための図であり、（ａ）は断面図〔図３（ａ）のＢ部拡大図〕であり、（ｂ）は図４（ａ）からコードホイールおよびワッシャを除いてＣ方向から見た平面図である。It is a figure for demonstrating the movement of oil, (a) is a cross-sectional view [enlarged view of part B of FIG. 3 (a)], and (b) is FIG. 4 (a) excluding the cord wheel and washer. It is a top view seen from the C direction.

図面を参照して、実施形態としての軸受ユニットおよびモータについて説明する。以下に示す実施形態はあくまでも例示に過ぎず、以下の実施形態で明示しない種々の変形や技術の適用を排除する意図はない。本実施形態の各構成は、それらの趣旨を逸脱しない範囲で種々変形して実施することができる。また、必要に応じて取捨選択することができ、あるいは適宜組み合わせることができる。 A bearing unit and a motor as embodiments will be described with reference to the drawings. The embodiments shown below are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified in the following embodiments. Each configuration of the present embodiment can be variously modified and implemented without departing from the gist thereof. In addition, it can be selected as needed, or can be combined as appropriate.

［１．構成］
［１−１．モータ］
図１は本実施形態に係るモータ９の分解斜視図であり、図２は本実施形態に係る軸受ユニットを分解して示す軸方向断面図である。本実施形態のモータ９は、例えば事務機器や家庭用電気機器などに使用される小型モータである。なお、モータ９の種類や用途は特に限定されない。 [1. Constitution]
[1-1. motor]
FIG. 1 is an exploded perspective view of the motor 9 according to the present embodiment, and FIG. 2 is an axial sectional view showing an exploded view of the bearing unit according to the present embodiment. The motor 9 of the present embodiment is a small motor used for, for example, office equipment and household electric equipment. The type and use of the motor 9 are not particularly limited.

図１に示すように、モータ９は、いずれもハウジング６に内蔵されるステータ，ロータ（いずれも図示略），制御基板８およびコードホイール３と、ロータと一体回転するシャフト５とを備える。ハウジング６は有底円筒状に形成され、その底部にはシャフト５の一端側を回転自在に支持する転がり軸受７が取り付けられる。ハウジング６の開口には、含油軸受２を固定したエンドベル１（ケース）が結合される。 As shown in FIG. 1, the motor 9 includes a stator, a rotor (all not shown), a control board 8, a cord wheel 3, and a shaft 5 that rotates integrally with the rotor. The housing 6 is formed in a bottomed cylindrical shape, and a rolling bearing 7 that rotatably supports one end side of the shaft 5 is attached to the bottom portion thereof. An end bell 1 (case) to which the oil-impregnated bearing 2 is fixed is coupled to the opening of the housing 6.

図１および図２に示すように、エンドベル１は、ハウジング６の外周面と同一面をなす周壁１ａを持った有底円筒状に形成される。エンドベル１は、その底部１ｂに、シャフト５の端部が挿入される貫通孔１ｃと、含油軸受２を収容する収容部１０とを有する。貫通孔１ｃは、底部１ｂの中央に貫設された円形状の孔部である。収容部１０は、底部１ｂの中央に凹設された部分であり、底部１ｂが一段低くなった部分であって底面と内周面１０ａとで形成される。なお、貫通孔１ｃは収容部１０の底面の中央に位置する。 As shown in FIGS. 1 and 2, the end bell 1 is formed in a bottomed cylindrical shape having a peripheral wall 1a that is flush with the outer peripheral surface of the housing 6. The end bell 1 has a through hole 1c into which the end portion of the shaft 5 is inserted and a housing portion 10 for accommodating the oil-impregnated bearing 2 in the bottom portion 1b thereof. The through hole 1c is a circular hole formed in the center of the bottom portion 1b. The accommodating portion 10 is a portion recessed in the center of the bottom portion 1b, which is a portion where the bottom portion 1b is lowered by one step, and is formed by a bottom surface and an inner peripheral surface 10a. The through hole 1c is located in the center of the bottom surface of the accommodating portion 10.

含油軸受２は、潤滑油を含浸させた円筒状の焼結体であり、シャフト５の他端を回転自在に支持する。シャフト５が回転すると、いわゆるポンプ作用が起こって細孔内の油が外部へと吸い出される。これにより、含油軸受２とシャフト５との間に油膜が形成される。シャフト５の回転中は、細孔内の油が外部への吸い出されるとともに含油軸受２の周辺の油が細孔内へと吸収される。一方、シャフト５の回転が停止すると、含油軸受２の表面に接している油は毛細管現象によって細孔に吸収される。 The oil-impregnated bearing 2 is a cylindrical sintered body impregnated with lubricating oil, and rotatably supports the other end of the shaft 5. When the shaft 5 rotates, a so-called pumping action occurs and the oil in the pores is sucked out. As a result, an oil film is formed between the oil-impregnated bearing 2 and the shaft 5. During the rotation of the shaft 5, the oil in the pores is sucked out and the oil around the oil-impregnated bearing 2 is absorbed into the pores. On the other hand, when the rotation of the shaft 5 is stopped, the oil in contact with the surface of the oil-impregnated bearing 2 is absorbed by the pores by the capillary phenomenon.

コードホイール３は、光学式エンコーダの構成部品であり、含油軸受２よりもエンドベル１の開口側に配置される。本実施形態のコードホイール３はカップ型に形成され、平面状かつ円環状の頂部３ｃ（受け部）と、頂部３ｃの外縁および内縁のそれぞれから同一方向に立設された外筒部３ａおよび内筒部３ｂとを有する。外筒部３ａは、周方向に並設され軸方向に延びた複数のスリット３ｄを有する。コードホイール３の頂部３ｃと含油軸受２との間には、円盤状のワッシャ４（受け部）が配置される。 The cord wheel 3 is a component of an optical encoder and is arranged on the opening side of the end bell 1 with respect to the oil-impregnated bearing 2. The cord wheel 3 of the present embodiment is formed in a cup shape, and has a flat and annular top portion 3c (receiving portion) and an outer cylinder portion 3a and an inner cylinder portion 3a erected in the same direction from the outer edge and the inner edge of the top 3c, respectively. It has a tubular portion 3b. The outer cylinder portion 3a has a plurality of slits 3d arranged side by side in the circumferential direction and extending in the axial direction. A disk-shaped washer 4 (receiving portion) is arranged between the top portion 3c of the cord wheel 3 and the oil-impregnated bearing 2.

上述したエンドベル１，含油軸受２，コードホイール３およびワッシャ４は、本実施形態の軸受ユニットを構成する主要部品である。以下、軸受ユニットについて詳述する。なお、以下の説明では便宜上、エンドベル１の底部１ｂ側を下方とし、その逆（エンドベル１の開口側）を上方として説明するが、モータ９の搭載方向によっては上下が逆転することや、横置きや斜め置きにされもある。例えば、エンドベル１の底部１ｂが上方，開口側が下方になることもなる。 The above-mentioned end bell 1, oil-impregnated bearing 2, cord wheel 3, and washer 4 are the main components constituting the bearing unit of the present embodiment. The bearing unit will be described in detail below. In the following description, for convenience, the bottom 1b side of the end bell 1 is set downward, and the reverse (opening side of the end bell 1) is set upward. However, depending on the mounting direction of the motor 9, the top and bottom may be reversed or the motor 9 may be placed horizontally. It is also placed diagonally. For example, the bottom portion 1b of the end bell 1 may be upward and the opening side may be downward.

［１−２．軸受ユニット］
本実施形態の軸受ユニットは、含油軸受２から飛散した油を受け止める（キャッチする）とともに、その油が含油軸受２へ戻れる構造（すなわち油を回収する構造）を有する。図３（ａ）は軸受ユニットの軸方向断面図であり、図３（ｂ）は図３（ａ）のＡ部を拡大して示す斜視図である。また、図４（ａ）は油の動きを説明するための断面図〔図３（ａ）のＢ部拡大図〕であり、図４（ｂ）は図４（ａ）からコードホイール３およびワッシャ４を除いてＣ方向から見た平面図である。なお、図４（ａ）および（ｂ）中のドット模様は油を例示したものである。 [1-2. Bearing unit]
The bearing unit of the present embodiment has a structure of receiving (catching) the oil scattered from the oil-impregnated bearing 2 and returning the oil to the oil-impregnated bearing 2 (that is, a structure of recovering the oil). FIG. 3A is an axial sectional view of the bearing unit, and FIG. 3B is an enlarged perspective view showing a portion A of FIG. 3A. Further, FIG. 4A is a cross-sectional view for explaining the movement of oil [enlarged view of part B of FIG. 3A], and FIG. 4B is a cord wheel 3 and a washer from FIG. 4A. It is a top view seen from the C direction except for 4. The dot patterns in FIGS. 4 (a) and 4 (b) exemplify oil.

図２，図３（ａ）および（ｂ）に示すように、軸受ユニットは、上述した収容部１０と、含油軸受２を支持する複数のリブ１６と、含油軸受２から飛散した油を回収するための第一貯油部１１と、第一貯油部１１の油を含油軸受２へと導くための複数の還流路１３と、還流路１３を伝ってきた油を含油軸受２の細孔に吸収させるための複数の空隙１４とを有する。さらに、本実施形態の軸受ユニットは、飛散した油を受け止める頂部３ｃおよび飛散防止壁３ｅと、漏出した油を回収するための第二貯油部１２と、還流路１３を区画形成する複数の突起部１５と油止めのワッシャ４とを有する。 As shown in FIGS. 2, 3 (a) and 3 (b), the bearing unit collects the above-mentioned accommodating portion 10, the plurality of ribs 16 supporting the oil-impregnated bearing 2, and the oil scattered from the oil-impregnated bearing 2. First oil storage section 11 for this purpose, a plurality of return paths 13 for guiding the oil of the first oil storage section 11 to the oil-impregnated bearing 2, and the oil transmitted through the return path 13 is absorbed by the pores of the oil-impregnated bearing 2. It has a plurality of voids 14 for the purpose. Further, the bearing unit of the present embodiment has a top portion 3c and a scattering prevention wall 3e for receiving the scattered oil, a second oil storage portion 12 for collecting the leaked oil, and a plurality of protrusions for partitioning the return path 13. It has 15 and an oil stopper washer 4.

図１〜図３（ｂ）に示すように、複数のリブ１６は、収容部１０の内周面１０ａにおいて周方向に互いに離隔して配置される。各リブ１６は、軸方向に延びる突条に形成され、含油軸受２の外周面２ａを軸方向全体に亘って支持可能な長さを持つ。含油軸受２は、その外周面２ａがリブ１６に圧着するように収容部１０内に圧入される。本実施形態の収容部１０には、８個のリブ１６が周方向に等間隔に配置され、周方向に均等な力で含油軸受２を支持する。なお、リブ１６の個数や配置がこれ以外であってもよい。 As shown in FIGS. 1 to 3 (b), the plurality of ribs 16 are arranged apart from each other in the circumferential direction on the inner peripheral surface 10a of the accommodating portion 10. Each rib 16 is formed in a ridge extending in the axial direction, and has a length capable of supporting the outer peripheral surface 2a of the oil-impregnated bearing 2 over the entire axial direction. The oil-impregnated bearing 2 is press-fitted into the accommodating portion 10 so that its outer peripheral surface 2a is crimped to the rib 16. Eight ribs 16 are arranged at equal intervals in the circumferential direction in the accommodating portion 10 of the present embodiment to support the oil-impregnated bearing 2 with equal force in the circumferential direction. The number and arrangement of the ribs 16 may be other than this.

図１〜図４（ｂ）に示すように、第一貯油部１１は、含油軸受２から飛散した油を受け止めて保持する部分であり、収容部１０の開口側（すなわち上方）における径方向外側（以下「外側」という）に設けられる。第一貯油部１１は、エンドベル１の底部１ｂに凹設された環状の溝であって、収容部１０の内周面１０ａよりも外側に位置する外周壁１１ａと、含油軸受２の上端面２ｂよりも下方に位置する保持面１１ｂとを有する。保持面１１ｂは径方向かつ周方向に広がる平面であり、受け止めた油を一時的に保持する。外周壁１１ａは保持面１１ｂの外側に設けられた（立設された）壁部であり、油がそれ以上外側へと飛散しないように規制する。 As shown in FIGS. 1 to 4 (b), the first oil storage portion 11 is a portion that receives and holds the oil scattered from the oil-impregnated bearing 2, and is radially outside on the opening side (that is, above) of the accommodating portion 10. It is provided on (hereinafter referred to as "outside"). The first oil storage portion 11 is an annular groove recessed in the bottom portion 1b of the end bell 1, and has an outer peripheral wall 11a located outside the inner peripheral surface 10a of the accommodating portion 10 and an upper end surface 2b of the oil-impregnated bearing 2. It has a holding surface 11b located below. The holding surface 11b is a flat surface extending in the radial direction and the circumferential direction, and temporarily holds the received oil. The outer peripheral wall 11a is a wall portion (erected) provided on the outside of the holding surface 11b, and regulates oil from being further scattered to the outside.

図４（ｂ）に示すように、還流路１３は、第一貯油部１１と空隙１４とを連通する放射状の溝であり、第一貯油部１１の径方向内側（以下「内側」という）に設けられる。本実施形態の還流路１３は、隣接する突起部１５の間に位置するとともに、図３（ｂ）および図４（ｂ）に示すように、保持面１１ｂと同一面をなす下面を有する。還流路１３を流通方向に直交する平面で切断したときの断面形状は、上方が開放したコ字状とされる。第一貯油部１１の保持面１１ｂに溜まった油は、図４（ａ）および（ｂ）中に破線で示すように還流路１３を伝って空隙１４へと導かれる。 As shown in FIG. 4B, the return passage 13 is a radial groove that communicates the first oil storage portion 11 and the void 14, and is radially inside (hereinafter referred to as “inside”) of the first oil storage portion 11. Provided. The return path 13 of the present embodiment is located between the adjacent protrusions 15 and has a lower surface that is flush with the holding surface 11b as shown in FIGS. 3 (b) and 4 (b). The cross-sectional shape when the return path 13 is cut in a plane orthogonal to the distribution direction is a U-shape with an open upper part. The oil accumulated on the holding surface 11b of the first oil storage unit 11 is guided to the void 14 through the reflux path 13 as shown by the broken line in FIGS. 4A and 4B.

図３（ｂ）〜図４（ｂ）に示すように、複数の突起部１５は、第一貯油部１１の保持面１１ｂよりも上方へ突設されたブロック形状であり、第一貯油部１１の内側において周方向に互いに離隔して配置される。各突起部１５は、収容部１０の内周面１０ａと連続した内面を有する。複数の突起部１５のうち、収容部１０の内周面１０ａに形成されたリブ１６の延長線上に位置する突起部１５の内面には、そのリブ１６が連続して形成される。 As shown in FIGS. 3 (b) to 4 (b), the plurality of protrusions 15 have a block shape protruding above the holding surface 11b of the first oil storage unit 11, and the first oil storage unit 11 They are arranged at a distance from each other in the circumferential direction inside the. Each protrusion 15 has an inner surface continuous with the inner peripheral surface 10a of the accommodating portion 10. Of the plurality of protrusions 15, the ribs 16 are continuously formed on the inner surface of the protrusions 15 located on the extension line of the ribs 16 formed on the inner peripheral surface 10a of the housing portion 10.

上記の通り、還流路１３は周方向に隣接する突起部１５の間に位置することから、突起部１５は還流路１３を区画（形成）する機能を有するとも言える。さらに、リブ１６が形成された突起部１５は、含油軸受２を支持する機能を併せ持つ。突起部１５にリブ１６を延長して設けることで、含油軸受２がリブ１６によって強固に支持されるとともに収容部１０の深さが小さく（軸方向長さが短く）抑えられる。本実施形態のエンドベル１には、１６個の突起部１５が周方向に等間隔に配置され、この突起部１５の一つ置きにリブ１６が設けられる。なお、突起部１５の個数や配置はこれに限られない。 As described above, since the return path 13 is located between the protrusions 15 adjacent to each other in the circumferential direction, it can be said that the protrusion 15 has a function of partitioning (forming) the return path 13. Further, the protrusion 15 on which the rib 16 is formed also has a function of supporting the oil-impregnated bearing 2. By extending the rib 16 to the protrusion 15, the oil-impregnated bearing 2 is firmly supported by the rib 16 and the depth of the accommodating portion 10 is suppressed to be small (the axial length is short). In the end bell 1 of the present embodiment, 16 protrusions 15 are arranged at equal intervals in the circumferential direction, and ribs 16 are provided at every other protrusions 15. The number and arrangement of the protrusions 15 are not limited to this.

図３（ｂ）〜図４（ｂ）に示すように、空隙１４は、含油軸受２の外周面２ａと収容部１０の内周面１０ａとの間に設けられた微小な空間であり、周方向に隣接するリブ１６の間に形成される。空隙１４に存在する油は、毛細管現象によって含油軸受２の細孔に吸収される。本実施形態のエンドベル１は、少なくとも第一貯油部１１および還流路１３に撥油処理が施された撥油面を有する。撥油処理とは、油をはじく撥油処理剤を塗布する処理である。撥油面に付着した油は、広がらずに球状となる。なお、エンドベル１の表面全体に撥油処理が施されていてもよい。 As shown in FIGS. 3 (b) to 4 (b), the gap 14 is a minute space provided between the outer peripheral surface 2a of the oil-impregnated bearing 2 and the inner peripheral surface 10a of the accommodating portion 10, and is a circumference. It is formed between ribs 16 adjacent in the direction. The oil existing in the void 14 is absorbed by the pores of the oil-impregnated bearing 2 by the capillary phenomenon. The end bell 1 of the present embodiment has an oil-repellent surface in which at least the first oil storage portion 11 and the return passage 13 are subjected to an oil-repellent treatment. The oil repellent treatment is a treatment of applying an oil repellent treatment agent that repels oil. The oil adhering to the oil-repellent surface does not spread and becomes spherical. The entire surface of the end bell 1 may be oil-repellent.

図４（ａ）に示すように、頂部３ｃは、第一貯油部１１の外周壁１１ａよりも内側において径方向かつ周方向に延設され、図中破線で示すように、含油軸受２から飛散した油を受け止めて第一貯油部１１や還流路１３などへ戻す機能を持つ。本実施形態の頂部３ｃは、第一貯油部１１の外周壁１１ａの上端よりも上方に位置し、径方向寸法が含油軸受２よりも大きい。また、図３（ａ）〜図４（ａ）に示すように、本実施形態のワッシャ４は、含油軸受２から離隔して頂部３ｃに接した状態で配置され、含油軸受２から漏出した油が上方へ飛散することを防止する機能を持つ。すなわち本実施形態では、頂部３ｃおよびワッシャ４が、おもに軸方向へ飛散する油を受け止める受け部として機能する。 As shown in FIG. 4A, the top portion 3c extends radially and circumferentially inside the outer peripheral wall 11a of the first oil storage portion 11, and scatters from the oil-impregnated bearing 2 as shown by the broken line in the figure. It has a function of receiving the oil and returning it to the first oil storage unit 11 or the return passage 13. The top portion 3c of the present embodiment is located above the upper end of the outer peripheral wall 11a of the first oil storage portion 11, and has a larger radial dimension than the oil-impregnated bearing 2. Further, as shown in FIGS. 3A to 4A, the washer 4 of the present embodiment is arranged in a state of being separated from the oil-impregnated bearing 2 and in contact with the top portion 3c, and the oil leaked from the oil-impregnated bearing 2 is provided. Has a function to prevent the bearing from scattering upward. That is, in the present embodiment, the top portion 3c and the washer 4 mainly function as a receiving portion for receiving the oil scattered in the axial direction.

図３（ａ）〜図４（ａ）に示すように、飛散防止壁３ｅは、第一貯油部１１の外周壁１１ａよりも内側において、頂部３ｃから軸方向かつ周方向に延設された壁部である。図２に示すように、本実施形態の飛散防止壁３ｅは円環状に形成され、コードホイール３の頂部３ｃから外筒部３ａおよび内筒部３ｂとは逆方向に突設される。コードホイール３は、外筒部３ａおよび内筒部３ｂが頂部３ｃの上方に位置する姿勢で取り付けられるため、飛散防止壁３ｅは下方に向けて延びる。すなわち図４（ａ）に示すように、飛散防止壁３ｅは、第一貯油部１１の外周壁１１ａとは逆方向から立設され、保持面１１ｂとの間に隙間を形成する。 As shown in FIGS. 3 (a) to 4 (a), the shatterproof wall 3e is a wall extending axially and circumferentially from the top 3c inside the outer peripheral wall 11a of the first oil storage portion 11. It is a department. As shown in FIG. 2, the shatterproof wall 3e of the present embodiment is formed in an annular shape, and is projected from the top portion 3c of the cord wheel 3 in the direction opposite to the outer cylinder portion 3a and the inner cylinder portion 3b. Since the cord wheel 3 is attached in a posture in which the outer cylinder portion 3a and the inner cylinder portion 3b are located above the top portion 3c, the shatterproof wall 3e extends downward. That is, as shown in FIG. 4A, the shatterproof wall 3e is erected from the direction opposite to the outer peripheral wall 11a of the first oil storage portion 11 and forms a gap with the holding surface 11b.

飛散防止壁３ｅは、第一貯油部１１の外周壁１１ａと突起部１５の外面との間に位置し、図４（ａ）中に破線で示すように、頂部３ｃと共に飛散した油を受け止めて第一貯油部１１へと導く。本実施形態の飛散防止壁３ｅは、内側の面が頂部３ｃから離れるほど外側に向かって傾斜しており、突出方向（図中下方）に向かって徐々に薄肉化されている。さらに飛散防止壁３ｅは、径方向視した場合に、第一貯油部１１の外周壁１１ａの一部と重なるように設けられる。本実施形態では、図３（ａ）に示すように、外周壁１１ａの上端が第一貯油部１１の外側における底部１ｂの内面よりも上方に位置するように設けられており、この外周壁１１ａの上端よりも下方に飛散防止壁３ｅの下端が配置される。 The scattering prevention wall 3e is located between the outer peripheral wall 11a of the first oil storage portion 11 and the outer surface of the protrusion 15, and receives the scattered oil together with the top portion 3c as shown by the broken line in FIG. 4A. Lead to the first oil storage section 11. The shatterproof wall 3e of the present embodiment is inclined outward as the inner surface is separated from the top portion 3c, and is gradually thinned in the protruding direction (lower part in the figure). Further, the shatterproof wall 3e is provided so as to overlap a part of the outer peripheral wall 11a of the first oil storage portion 11 when viewed in the radial direction. In the present embodiment, as shown in FIG. 3A, the upper end of the outer peripheral wall 11a is provided so as to be located above the inner surface of the bottom portion 1b on the outside of the first oil storage portion 11, and the outer peripheral wall 11a is provided. The lower end of the shatterproof wall 3e is arranged below the upper end of the.

図１〜図３（ｂ）に示すように、第二貯油部１２は、収容部１０の底面における外周部に凹設された円環状の溝であり、空隙１４と連通している。第二貯油部１２は、含油軸受２から漏出した油のうち、収容部１０の内周面１０ａや含油軸受２の外周面２ａ等を伝って移動した油を受け止めて一時的に保持することで、シャフト５の他端側からの油漏れを防止する。なお、第二貯油部１２によって一時的に保持された油は、含油軸受２の表面に接することで細孔内へと吸収される。 As shown in FIGS. 1 to 3 (b), the second oil storage portion 12 is an annular groove recessed in the outer peripheral portion on the bottom surface of the accommodating portion 10 and communicates with the void 14. The second oil storage unit 12 receives and temporarily holds the oil leaked from the oil-impregnated bearing 2 that has moved along the inner peripheral surface 10a of the accommodating unit 10 and the outer peripheral surface 2a of the oil-impregnated bearing 2. , Prevents oil leakage from the other end side of the shaft 5. The oil temporarily held by the second oil storage unit 12 is absorbed into the pores by coming into contact with the surface of the oil-impregnated bearing 2.

［２．効果］
（１）上述した軸受ユニットによれば、含油軸受２を収容する収容部１０の開口側の外側に第一貯油部１１が設けられるため、含油軸受２から飛散した油を外周壁１１ａで受け止めて、保持面１１ｂで一時的に保持することができる。さらに、第一貯油部１１に溜まった油が含油軸受２へ戻れるように還流路１３および空隙１４が設けられるため、飛散した油を回収して再び含油軸受２に吸収させることができる。これにより、軸受油の減少を抑制することができる。 [2. effect]
(1) According to the bearing unit described above, since the first oil storage portion 11 is provided outside the opening side of the accommodating portion 10 accommodating the oil-impregnated bearing 2, the oil scattered from the oil-impregnated bearing 2 is received by the outer peripheral wall 11a. , Can be temporarily held by the holding surface 11b. Further, since the return path 13 and the void 14 are provided so that the oil accumulated in the first oil storage unit 11 can return to the oil-impregnated bearing 2, the scattered oil can be recovered and absorbed by the oil-impregnated bearing 2 again. As a result, the decrease in bearing oil can be suppressed.

（２）上述した軸受ユニットによれば、頂部３ｃおよびワッシャ４によっておもに軸方向への油の飛散を抑制することができる。
（３）また、第一貯油部１１の外周壁１１ａよりも内側に飛散防止壁３ｅが設けられることから、頂部３ｃと共に飛散した油を受け止めて第一貯油部１１へと導くことができ、飛散した油を効率よく回収することができる。 (2) According to the bearing unit described above, the top 3c and the washer 4 can mainly suppress the scattering of oil in the axial direction.
(3) Further, since the scattering prevention wall 3e is provided inside the outer peripheral wall 11a of the first oil storage unit 11, the oil scattered together with the top portion 3c can be received and guided to the first oil storage unit 11 and scattered. The oil can be recovered efficiently.

（４）また、飛散防止壁３ｅは第一貯油部１１の外周壁１１ａとは逆方向から設けられ、径方向から見たときに外周壁１１ａの一部と重なっていることから、飛散した油を逃すことなく回収することができ、油の回収率を向上させることができる。なお、飛散防止壁３ｅがコードホイール３に設けられている場合には、構成を簡素化することができる。また、コードホイール３が既存部品である場合には、部品点数を増やすことなく油の回収率を向上させることができる。 (4) Further, since the scattering prevention wall 3e is provided from the direction opposite to the outer peripheral wall 11a of the first oil storage portion 11 and overlaps with a part of the outer peripheral wall 11a when viewed from the radial direction, the scattered oil. Can be recovered without missing, and the oil recovery rate can be improved. When the shatterproof wall 3e is provided on the cord wheel 3, the configuration can be simplified. Further, when the cord wheel 3 is an existing part, the oil recovery rate can be improved without increasing the number of parts.

（５）上述した軸受ユニットでは、第一貯油部１１の内側に複数の突起部１５が突設され、リブ１６の延長線上に位置する突起部１５にはそのリブ１６が連続して形成される。すなわち、リブ１６が延設された突起部１５が第一貯油部１１の保持面１１ｂよりも突設されることから、収容部１０の深さを小さく抑えつつ、含油軸受２を強固に支持することができる。また、隣接する突起部１５間の溝を還流路１３として利用することで、第一貯油部１１の油が空隙１４へと導かれやすくなり、油の循環性を向上させることができる。 (5) In the bearing unit described above, a plurality of protrusions 15 are projected inside the first oil storage portion 11, and the ribs 16 are continuously formed on the protrusions 15 located on the extension line of the ribs 16. .. That is, since the protrusion 15 on which the rib 16 is extended protrudes from the holding surface 11b of the first oil storage portion 11, the oil-impregnated bearing 2 is firmly supported while keeping the depth of the accommodating portion 10 small. be able to. Further, by using the groove between the adjacent protrusions 15 as the reflux path 13, the oil in the first oil storage portion 11 can be easily guided to the gap 14, and the oil circulation can be improved.

（６）上述した軸受ユニットによれば、収容部１０の底面における外周部に第二貯油部１２が凹設されるため、含油軸受２から漏出した油のうち、収容部１０の内周面１０ａや含油軸受２の外周面２ａ等を伝って移動した油も回収することができる。第二貯油部１２は空隙１４と連通していることから、第二貯油部１２で受け止めた油はいずれ空隙１４へと導かれ、含油軸受２に戻ることができる。これにより、軸受油の減少をより抑えることができる。 (6) According to the bearing unit described above, since the second oil storage portion 12 is recessed in the outer peripheral portion on the bottom surface of the accommodating portion 10, among the oil leaked from the oil-impregnated bearing 2, the inner peripheral surface 10a of the accommodating portion 10 Oil that has moved along the outer peripheral surface 2a of the oil-impregnated bearing 2 and the like can also be recovered. Since the second oil storage unit 12 communicates with the void 14, the oil received by the second oil storage unit 12 is eventually guided to the void 14 and can return to the oil-impregnated bearing 2. As a result, the decrease in bearing oil can be further suppressed.

（７）上述した軸受ユニットによれば、少なくとも第一貯油部１１と還流路１３とに撥油面が設けられることから、表面に付着した油を球状にでき、油の広がりを防止することができる。これにより、第一貯油部１１や還流路１３に存在する油が空隙１４に戻りやすくなるため、油の循環性を向上させることができる。
（８）上述したモータ９によれば、シャフト５を回転自在に支持する含油軸受２と、この含油軸受２が固定されるエンドベル１とに対して上述した軸受ユニットが適用されていることから、飛散した油を回収して含油軸受２に戻すことができる。これにより、軸受油の減少を抑制することができ、モータ９の品質や寿命を向上させることができる。 (7) According to the bearing unit described above, since the oil-repellent surface is provided at least in the first oil storage portion 11 and the return passage 13, the oil adhering to the surface can be made spherical and the oil can be prevented from spreading. it can. As a result, the oil existing in the first oil storage unit 11 and the return passage 13 can easily return to the void 14, so that the oil circulation can be improved.
(8) According to the motor 9 described above, the bearing unit described above is applied to the oil-impregnated bearing 2 that rotatably supports the shaft 5 and the end bell 1 to which the oil-impregnated bearing 2 is fixed. The scattered oil can be recovered and returned to the oil-impregnated bearing 2. As a result, the decrease in bearing oil can be suppressed, and the quality and life of the motor 9 can be improved.

［３．その他］
上記の実施形態で説明した軸受ユニットは一例であって、その構成は上述したものに限られない。例えば、第一貯油部がエンドベル１の底部１ｂに凹設されたものではなく、底部１ｂから突設された外周壁と、保持面としての底部１ｂの表面とで構成されていてもよい。第一貯油部は、少なくとも収容部１０の開口側における外側に設けられており、外周壁と保持面とを有することで軸受２から飛散した油を受け止めて保持する機能（すなわち飛散した油を回収するための機能）を発揮しうる構成であればよい。 [3. Others]
The bearing unit described in the above embodiment is an example, and its configuration is not limited to that described above. For example, the first oil storage portion may not be recessed in the bottom portion 1b of the end bell 1, but may be composed of an outer peripheral wall projecting from the bottom portion 1b and a surface of the bottom portion 1b as a holding surface. The first oil storage unit is provided at least on the outside on the opening side of the accommodating unit 10, and has a function of receiving and holding the oil scattered from the bearing 2 by having an outer peripheral wall and a holding surface (that is, collecting the scattered oil). Any configuration may be sufficient as long as it can exhibit the function for performing the function.

また、還流路１３の構成は上述したものに限られない。上述した実施形態では、隣接する突起部１５の間に還流路１３が位置する構成を例示したが、突起部１５を省略し、還流路１３が保持面１１ｂから内側に一様に広がる円環状の面として設けられていてもよい。また、還流路１３の底面が内側に向かって下り傾斜していてもよい。還流路１３は、少なくとも第一貯油部１１と空隙１４とを連通する流路としての機能を発揮しうる構成であればよい。なお、突起部１５は、リブ１６の延長線上にのみ設けられていてもよいし、突起部１５を省略し、収容部１０の軸方向長さ（深さ）を大きくしてもよい。 Further, the configuration of the return path 13 is not limited to that described above. In the above-described embodiment, the configuration in which the return path 13 is located between the adjacent protrusions 15 is illustrated, but the protrusion 15 is omitted, and the return path 13 is an annular shape that uniformly extends inward from the holding surface 11b. It may be provided as a surface. Further, the bottom surface of the return path 13 may be inclined downward toward the inside. The return passage 13 may have a configuration capable of demonstrating at least a function as a flow path for communicating the first oil storage unit 11 and the void 14. The protrusion 15 may be provided only on the extension line of the rib 16, or the protrusion 15 may be omitted and the axial length (depth) of the accommodating portion 10 may be increased.

飛散した油を受け止める受け部および飛散防止壁３ｅの各構成は上述したものに限られない。例えば、受け部としての頂部の下端が第一貯油部１１の外周壁１１ａの上端よりも下方（含油軸受２側）に設けられていてもよい。この場合、頂部で受け止めた油を外周壁１１ａで効果的に受け止めることができるため、油の回収率を高めることができる。また、頂部３ｃおよびワッシャ４のいずれか一方を受け部として機能させてもよいし、受け部としての機能を持った専用品を追加してもよい。 The configurations of the receiving portion for receiving the scattered oil and the scattering prevention wall 3e are not limited to those described above. For example, the lower end of the top portion as the receiving portion may be provided below the upper end of the outer peripheral wall 11a of the first oil storage portion 11 (on the oil-impregnated bearing 2 side). In this case, the oil received at the top can be effectively received by the outer peripheral wall 11a, so that the oil recovery rate can be increased. Further, either one of the top portion 3c and the washer 4 may be made to function as a receiving portion, or a special product having a function as a receiving portion may be added.

また、飛散防止壁３ｅの位置は、第一貯油部１１の外周壁１１ａよりも内側であればよく、還流路１３と軸方向に重なっていてもよい。飛散防止壁３ｅが、第一貯留部１１の保持面１１ｂに接するような突出長さを有していてもよいし、内側面が頂部３ｃに対し直交していてもよい。なお、上述した実施形態ではコードホイール３に飛散防止壁３ｅが設けられているが、コードホイール３以外の別部品に飛散防止壁を設けてもよいし、飛散防止壁の専用品を追加してもよい。あるいは、飛散防止壁を省略してもよい。この場合、第一貯油部１１の外周壁１１ａを高くし、外周壁１１ａの上端とコードホイール３の頂部３ｃとの間の隙間を小さくするか、またはコードホイール３の外径を外周壁１１ａの内径よりも小さくし、かつコードホイール３の頂部３ｃの下端を外周壁１１ａの上端よりも低くすることが好ましい。なお、コードホイール３を用いない場合には、飛散防止壁を省略した場合と同様の構成とすることで、ワッシャ４などで油の飛散防止効果が期待できる。 Further, the position of the shatterproof wall 3e may be inside the outer peripheral wall 11a of the first oil storage portion 11, and may overlap with the return path 13 in the axial direction. The shatterproof wall 3e may have a protruding length so as to be in contact with the holding surface 11b of the first storage portion 11, or the inner side surface may be orthogonal to the top portion 3c. In the above-described embodiment, the cord wheel 3 is provided with the shatterproof wall 3e, but the shatterproof wall may be provided on another part other than the cord wheel 3, or a special product for the shatterproof wall may be added. May be good. Alternatively, the shatterproof wall may be omitted. In this case, the outer peripheral wall 11a of the first oil storage portion 11 is raised to reduce the gap between the upper end of the outer peripheral wall 11a and the top portion 3c of the cord wheel 3, or the outer diameter of the cord wheel 3 is set to the outer diameter of the outer peripheral wall 11a. It is preferable that the diameter is smaller than the inner diameter and the lower end of the top portion 3c of the cord wheel 3 is lower than the upper end of the outer peripheral wall 11a. When the cord wheel 3 is not used, the washer 4 or the like can be expected to have an effect of preventing oil from scattering by adopting the same configuration as when the scattering prevention wall is omitted.

第二貯油部１２の構成は上述したものに限られない。例えば、第二貯油部１２が円環状ではなく、シャフト５の周囲に放射状に広がる複数の溝として設けられていてもよい。なお、第二貯油部１２を省略してもよい。また、上述したエンドベル１には撥油面が設けられているが、撥油処理は必須ではなく省略してもよい。なお、エンドベル１，コードホイール３，ハウジング６等の具体的な形状は上述したものに限られず、これらは有底筒状であればよく、軸直交断面が円形ではなく矩形状や長円状等であってもよい。
また、上述した軸受ユニットは、シャフトを回転自在に支持する含油軸受と、この含油軸受が固定される有底筒状のケースとを備えた製品に適用可能であり、適用対象はモータに限られない。 The configuration of the second oil storage unit 12 is not limited to that described above. For example, the second oil storage portion 12 may be provided as a plurality of grooves that radiate around the shaft 5 instead of an annular shape. The second oil storage unit 12 may be omitted. Further, although the above-mentioned end bell 1 is provided with an oil-repellent surface, the oil-repellent treatment is not essential and may be omitted. The specific shapes of the end bell 1, the cord wheel 3, the housing 6, etc. are not limited to those described above, and these may be bottomed tubular shapes, and the axially orthogonal cross sections are not circular but rectangular or oval. It may be.
Further, the above-mentioned bearing unit can be applied to a product having an oil-impregnated bearing that rotatably supports the shaft and a bottomed tubular case to which the oil-impregnated bearing is fixed, and the application target is limited to a motor. Absent.

１ エンドベル（ケース）
１ｂ 底部
２ 軸受（含油軸受）
２ａ 外周面
３ コードホイール
３ｃ 頂部（受け部）
３ｅ 飛散防止壁
４ ワッシャ（受け部）
５ シャフト
６ ハウジング
９ モータ
１０ 収容部
１０ａ 内周面
１１ 第一貯油部
１１ａ 外周壁
１１ｂ 保持面
１２ 第二貯油部
１３ 還流路
１４ 空隙
１５ 突起部
１６ リブ 1 End bell (case)
1b Bottom 2 Bearing (oil-impregnated bearing)
2a Outer surface 3 Cord wheel 3c Top (receiver)
3e shatterproof wall 4 washer (receiver)
5 Shaft 6 Housing 9 Motor 10 Accommodating part 10a Inner peripheral surface 11 First oil storage part 11a Outer wall 11b Holding surface 12 Second oil storage part 13 Reflux path 14 Void 15 Protrusion part 16 Rib

Claims (7)

シャフトを回転自在に支持する含油軸受と、前記含油軸受が固定される有底筒状のケースと、を具備した軸受ユニットであって、
前記ケースの底部に凹設されるとともに中央に貫通孔を有し、前記含油軸受を収容する収容部と、
前記収容部の内周面に突条に形成されるとともに周方向に互いに離隔して配置され、前記含油軸受を支持する複数のリブと、
前記収容部の開口側の径方向外側において前記底部に凹設された環状の溝であって、前記収容部の前記内周面よりも径方向外側に立設された外周壁と、径方向かつ周方向に広がる保持面とを有し、前記含油軸受から飛散した油を回収するための第一貯油部と、
隣接する前記リブ間に位置し、前記含油軸受の外周面と前記収容部の前記内周面との間に設けられた空隙と、
前記第一貯油部と前記空隙とを連通する放射状の溝である還流路と、
前記収容部の前記内周面と連続した内面を持ち、前記保持面よりも前記収容部の前記開口側へ突設された複数の突起部と、を備え、
前記複数の突起部は、前記第一貯油部の径方向内側において周方向に互いに離隔して配置されるとともに、前記収容部の前記内周面に形成された前記リブの延長線上に位置する前記内面には前記リブが連続して形成され、
前記還流路は、隣接する前記突起部の間に位置する
ことを特徴とする、軸受ユニット。 A bearing unit including an oil-impregnated bearing that rotatably supports a shaft and a bottomed tubular case to which the oil-impregnated bearing is fixed.
Has a through hole in Rutotomoni central recessed in the bottom of the case, and a storage portion for storing the oil-impregnated bearing,
A plurality of ribs formed in a ridge on the inner peripheral surface of the accommodating portion and arranged apart from each other in the circumferential direction to support the oil-impregnated bearing, and
A annular groove which is recessed in Oite the bottom radially outside the opening side of the receiving portion, and an outer peripheral wall provided upright in a radial direction outer side than the inner circumferential surface of the accommodating portion, A first oil storage unit that has a holding surface that extends in the radial and circumferential directions and that collects oil scattered from the oil-impregnated bearing.
A gap located between the adjacent ribs and provided between the outer peripheral surface of the oil-impregnated bearing and the inner peripheral surface of the accommodating portion,
A reflux path, which is a radial groove communicating the first oil storage portion and the void,
A plurality of protrusions having an inner surface continuous with the inner peripheral surface of the accommodating portion and projecting from the holding surface toward the opening side of the accommodating portion are provided .
The plurality of protrusions are arranged radially inside the first oil storage portion so as to be separated from each other in the circumferential direction, and are located on an extension line of the rib formed on the inner peripheral surface of the storage portion. The ribs are continuously formed on the inner surface,
The bearing unit, characterized in that the return path is located between the adjacent protrusions . 前記含油軸受よりも前記ケースの開口側に配置されたコードホイールと、
前記コードホイールと前記含油軸受との間に配置されたワッシャと、をさらに具備し、
前記コードホイール及び前記ワッシャの少なくとも一方は、前記第一貯油部の前記外周壁よりも径方向内側において径方向かつ周方向に延設され、前記飛散した油を受け止める受け部として機能する
ことを特徴とする、請求項１記載の軸受ユニット。 A cord wheel arranged on the opening side of the case with respect to the oil-impregnated bearing,
A washer disposed between the cord wheel and the oil-impregnated bearing is further provided.
At least one of the cord wheel and the washer extends radially and radially inside the outer peripheral wall of the first oil storage portion, and functions as a receiving portion for receiving the scattered oil. > The bearing unit according to claim 1, wherein the bearing unit is characterized in that. 前記第一貯油部の前記外周壁よりも径方向内側において、前記受け部から軸方向かつ周方向に延設され、前記飛散した油を受け止める飛散防止壁を備えた
ことを特徴とする、請求項２記載の軸受ユニット。 The claim is characterized in that, inside the outer peripheral wall of the first oil storage portion in the radial direction, a scattering prevention wall extending axially and circumferentially from the receiving portion and receiving the scattered oil is provided. 2. The bearing unit according to 2. 前記飛散防止壁は、前記第一貯油部の前記外周壁とは逆方向から設けられて前記保持面との間に隙間を形成するとともに、径方向視した場合に前記外周壁の一部と重なる
ことを特徴とする、請求項２記載の軸受ユニット。 The shatterproof wall is provided from the direction opposite to the outer peripheral wall of the first oil storage portion to form a gap between the first oil storage portion and the holding surface, and overlaps a part of the outer peripheral wall when viewed in the radial direction. The bearing unit according to claim 2, wherein the bearing unit is characterized in that . 前記収容部の底面における外周部に凹設されるとともに前記空隙と連通し、前記含油軸受から漏出した油を回収するための第二貯油部を備えた
ことを特徴とする、請求項１〜４のいずれか１項に記載の軸受ユニット。 Claims 1 to 4 include a second oil storage portion that is recessed in the outer peripheral portion on the bottom surface of the accommodating portion and communicates with the void to recover oil leaked from the oil-impregnated bearing. The bearing unit according to any one of the above items. 前記ケースは、少なくとも前記第一貯油部および前記還流路に撥油処理が施された撥油面を有する
ことを特徴とする、請求項１〜５のいずれか１項に記載の軸受ユニット。 The bearing unit according to any one of claims 1 to 5 , wherein the case has at least an oil-repellent surface subjected to an oil-repellent treatment on the first oil storage portion and the reflux path. ハウジングに内蔵されたステータおよびロータを具備したモータにおいて、
前記ロータと一体回転するシャフトを回転自在に支持する軸受と、前記ハウジングに結合されるとともに前記軸受が固定される有底筒状のエンドベルとに対して、請求項１〜６のいずれか１項に記載の軸受ユニットが適用された
ことを特徴とする、モータ。 In a motor with a stator and rotor built into the housing
Any one of claims 1 to 6 with respect to a bearing that rotatably supports a shaft that rotates integrally with the rotor and a bottomed tubular end bell that is coupled to the housing and to which the bearing is fixed. A motor, characterized in that the bearing unit described in is applied.
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