JP2540977Y2 - Rolling bearing - Google Patents
Rolling bearingInfo
- Publication number
- JP2540977Y2 JP2540977Y2 JP10656191U JP10656191U JP2540977Y2 JP 2540977 Y2 JP2540977 Y2 JP 2540977Y2 JP 10656191 U JP10656191 U JP 10656191U JP 10656191 U JP10656191 U JP 10656191U JP 2540977 Y2 JP2540977 Y2 JP 2540977Y2
- Authority
- JP
- Japan
- Prior art keywords
- lubricant
- peripheral part
- bearing
- grease
- outer peripheral
- 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 - Fee Related
Links
Description
【0001】[0001]
【産業上の利用分野】この考案は、グリース潤滑の軸
受、特に工作機械の主軸用軸受等のように、低温度上昇
で高速回転の部位に適する転がり軸受に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease lubricated bearing, and more particularly to a rolling bearing suitable for a high-temperature rotating part having a low temperature rise, such as a main shaft bearing of a machine tool.
【0002】[0002]
【従来の技術】グリース潤滑では、一般に軸受内部、す
なわち転動体,内外輪,保持器等の各部品間の隙間にグ
リースを封入して使用する。2. Description of the Related Art In grease lubrication, grease is generally used by sealing grease in the interior of a bearing, that is, in the gaps between components such as rolling elements, inner and outer rings, and cages.
【0003】この場合、各部品間に保持されるグリース
の量が少量であると、軸受の潤滑寿命が短くなる。封入
するグリース量をある程度多くすることは可能である
が、多量のグリースを前記の部品間に封入した場合、運
転初期はグリースの攪拌抵抗による発熱が大きくなるう
え、余分なグリースの排出やなじみを良くするための慣
らし運転に要する時間が長くなるという問題点がある。
また、回転中の遠心力によって、グリース保持量は少な
くなり、グリース寿命を向上させることは困難である。
特に、工作機械に使用するような場合、軸受における発
熱は加工精度に影響するため、極力低下させる必要があ
り、耐久性の向上も望まれる。In this case, if the amount of grease held between the components is small, the lubrication life of the bearing is shortened. Although it is possible to increase the amount of grease to be filled to some extent, if a large amount of grease is filled between the above-mentioned parts, heat generation due to the stirring resistance of the grease will increase in the initial stage of operation, and excess grease will be discharged and familiarized. There is a problem that the time required for the break-in operation to improve the condition becomes long.
In addition, the amount of grease retained is reduced due to the centrifugal force during rotation, and it is difficult to improve the grease life.
In particular, when the bearing is used for a machine tool, heat generated in the bearing affects the processing accuracy. Therefore, it is necessary to reduce the generated heat as much as possible.
【0004】このような問題点を解消したものとして、
本出願人は、グリース等の潤滑剤を内輪間座内に設けた
溜まり部に封入して軸受の潤滑寿命を長くするものを提
案した(実願平3−49662号、実願平3−7760
9号)。これらの提案のものでは、嵌合面の面粗さの凹
凸によって生じる微小隙間や、嵌合面に形成した微小な
スリットを潤滑剤流出路としており、溜まり部から転走
面付近への潤滑剤の流出は、潤滑剤流出路の微小隙間ま
たは微小スリットによる毛細管現象や、回転による遠心
力を利用して行われる。そのため、流出量の絞り効果が
大きく、高速回転時においても潤滑剤を極微量ずつ供給
することができた。流出量の調整は、面粗さや、微小ス
リットの大きさ,個数等で調整される。As a solution to such a problem,
The present applicant has proposed a method in which a lubricant such as grease is sealed in a reservoir provided in the inner ring spacer to extend the lubrication life of the bearing (Japanese Utility Model Application No. 3-49662, Japanese Utility Model Application No. Hei 3-7760).
No. 9). In these proposals, a small gap generated by unevenness of the surface roughness of the mating surface and a minute slit formed in the mating surface are used as the lubricant outflow passage, and the lubricant flows from the pool to the vicinity of the rolling surface. Is carried out by utilizing a capillary phenomenon due to a minute gap or a minute slit in the lubricant outflow path, or a centrifugal force due to rotation. For this reason, the effect of restricting the outflow amount was large, and a very small amount of lubricant could be supplied even during high-speed rotation. The outflow amount is adjusted by the surface roughness, the size and the number of the minute slits, and the like.
【0005】[0005]
【考案が解決しようとする課題】しかし反面、絞り効果
が大きすぎるために、高温時に潤滑剤の供給が不足する
ことが懸念される。近年のように、グリース潤滑での使
用回転数が益々高くなる状況においては、軸受温度の上
昇や、僅かな潤滑不足を生じても焼付きに至る可能性が
ある。軸受の焼付きの兆候としては、軸受の異常な温度
上昇があり、そのため軸受温度の上昇に感応して潤滑油
量を増やす手段が望まれる。However, on the other hand, there is a concern that the supply of the lubricant may be insufficient at a high temperature because the drawing effect is too large. As in recent years, in a situation where the number of rotations used in grease lubrication becomes higher and higher, there is a possibility that seizure may occur even if the bearing temperature rises or slight lubrication is insufficient. A sign of bearing seizure is an abnormal rise in temperature of the bearing. Therefore, means for increasing the amount of lubricating oil in response to the rise in bearing temperature is desired.
【0006】この考案の目的は、溜まり部に封入した潤
滑剤を運転に伴って微量ずつ供給できて、潤滑寿命の向
上が図れ、かつ確実な焼付き防止が図れる転がり軸受を
提供することである。An object of the present invention is to provide a rolling bearing that can supply a small amount of lubricant filled in a pool portion with operation, thereby improving lubrication life and reliably preventing seizure. .
【0007】[0007]
【課題を解決するための手段】この考案の転がり軸受
は、潤滑剤溜め空間を内部に設けた内輪間座を、互いに
内外に嵌合する内周部品および外周部品で形成し、前記
外周部品を内周部品に比べて線膨張係数の大きな材質と
したものである。内周部品と外周部品との嵌合面は、潤
滑剤溜め空間から転動体の転走路付近に開通する潤滑剤
流出路の一部となる。According to the rolling bearing of the present invention, an inner race spacer provided with a lubricant storage space inside is formed by an inner peripheral part and an outer peripheral part which are fitted into and out of each other. It is made of a material having a larger coefficient of linear expansion than inner peripheral parts. The fitting surface between the inner peripheral part and the outer peripheral part is a part of a lubricant outflow passage that opens from the lubricant reservoir space to the vicinity of the rolling path of the rolling element.
【0008】[0008]
【作用】この構成によると、潤滑剤溜め空間内の潤滑剤
またはその成分は、内輪間座の内周部品と外周部品との
嵌合面を通って、毛細管現象や内輪間座の回転に伴う遠
心力で転動体付近に補給される。したがって、少量ずつ
長期間にわたって補給が行われる。According to this structure, the lubricant or its component in the lubricant reservoir space passes through the fitting surface between the inner peripheral part and the outer peripheral part of the inner race spacer, and is accompanied by the capillary phenomenon and rotation of the inner race spacer. It is supplied near the rolling elements by centrifugal force. Therefore, replenishment is performed little by little over a long period of time.
【0009】潤滑不足が生じたときは、軸受温度が上昇
するが、内輪間座の外周部品の線膨張係数が内周部品よ
りも大きいために、温度上昇に伴って嵌合面の隙間が大
きくなる。そのため潤滑剤の供給量が増え、潤滑不足が
解消される。When the lubrication is insufficient, the bearing temperature rises. However, since the linear expansion coefficient of the outer part of the inner race spacer is larger than that of the inner part, the clearance of the fitting surface becomes larger as the temperature rises. Become. Therefore, the supply amount of the lubricant increases, and the lack of lubrication is eliminated.
【0010】[0010]
【実施例】この考案の一実施例を図1および図2に基づ
いて説明する。この実施例は、内輪回転型の複列アンギ
ュラ玉軸受に適用した例である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. This embodiment is an example applied to an inner ring rotating double row angular contact ball bearing.
【0011】この複列軸受は、各列の軸受1,1の内輪
2を個別に設け、外輪3を共用したものであり、両内輪
2,2間に内輪間座4が設けられる。転動体5は球状の
ものであり、保持器6のポケットに保持される。内輪2
は回転軸(図示せず)に固定され、外輪3は静止部材で
あるハウジングに固定される。In this double row bearing, the inner rings 2 of the bearings 1 and 1 in each row are individually provided and the outer ring 3 is shared, and an inner ring spacer 4 is provided between the inner rings 2 and 2. The rolling element 5 is spherical, and is held in a pocket of the retainer 6. Inner ring 2
Is fixed to a rotating shaft (not shown), and the outer race 3 is fixed to a housing which is a stationary member.
【0012】内輪間座4は、内外に嵌合させた内周部品
4aと外周部品4bとの2部品からなり、内周部品4a
の外径面に設けた円周溝と外周部品4bとの間で、潤滑
剤溜め空間7が形成される。内周部品4aの内径面に
は、潤滑剤溜め空間7に貫通した負圧防止用の貫通孔8
が設けてある。この孔8は必ずしも設けなくても良い。The inner ring spacer 4 is composed of two parts, an inner part 4a and an outer part 4b fitted inside and outside.
A lubricant reservoir space 7 is formed between the circumferential groove provided on the outer diameter surface of the first member and the outer peripheral part 4b. A through-hole 8 for preventing negative pressure, which penetrates the lubricant reservoir space 7,
Is provided. The holes 8 need not always be provided.
【0013】内周部品4aと外周部品4bとは締まり嵌
め状態とするが、その嵌合面9に、加工仕上げの面粗さ
(例えば0.2〜10μm)による凹凸のために微小隙
間が形成される。外周部品4bは、内周部品4aに比べ
て線膨張係数が大きな材質のものとする。The inner peripheral part 4a and the outer peripheral part 4b are tightly fitted to each other, but a small gap is formed on the fitting surface 9 due to unevenness due to the surface roughness of the finished work (for example, 0.2 to 10 μm). Is done. The outer peripheral part 4b is made of a material having a larger linear expansion coefficient than the inner peripheral part 4a.
【0014】図2に示すように、内輪間座4の外周部品
4bの側端面と内輪2との間には、わずかな幅dのスリ
ット10が全周又は部分的に設けられる。このスリット
10と、前記嵌合面9とで、潤滑剤溜め空間7から転動
体5の転走経路12に開通する潤滑剤流出路11が構成
される。As shown in FIG. 2, a slit 10 having a small width d is provided entirely or partially between the inner race 2 and the side end surface of the outer peripheral part 4b of the inner race spacer 4. The slit 10 and the fitting surface 9 form a lubricant outflow path 11 that opens from the lubricant storage space 7 to the rolling path 12 of the rolling element 5.
【0015】 軸受組立時において、転走経路12には
潤滑剤の封入を行うが、一般に封入されるよりも少量と
し、潤滑剤溜め空間7に可能なだけ潤滑剤を封入する。
潤滑剤溜め空間7に封入する潤滑剤としては、一般の半
固体または固体状のグリースの他に、液体状グリース
や、プラスチックグリース、含油樹脂、潤滑油を含ませ
た織布やフェルト等を使用することができる。プラスチ
ックグリースは、超高分子量ポリエチレンまたは低分子
量ポリエチレン等の樹脂とグリースとの混合物を加熱溶
融させて冷却により固形化した組成物であり、油が徐々
に滲み出すものが開発されている。 At the time of assembling the bearing, the rolling path 12 is filled with a lubricant. However, the amount of the lubricant is generally smaller than that of the rolling path, and the lubricant is filled in the lubricant reservoir space 7 as much as possible.
As the lubricant to be filled in the lubricant reservoir space 7, in addition to general semi-solid or solid grease, liquid grease, plastic grease, oil-impregnated resin, woven cloth or felt containing lubricating oil, or the like is used. can do. Plastic
Cook grease is made of ultra-high molecular weight polyethylene or low molecular weight
Heat the mixture of grease with resin such as polyethylene.
It is a composition that is melted and solidified by cooling.
Something that seeps into is being developed.
【0016】この構成によると、潤滑剤溜め空間7に封
入された潤滑剤またはその成分は、内輪間座4の内外部
品4a,4bの嵌合面9から、毛細管現象で軸方向両側
へ滲み出す。この内輪間座4の側端面に滲み出た潤滑剤
またはその成分は、内輪間座4の回転に伴う遠心力によ
り外径方向に流れ、転走経路12の軌道面に供給され
る。潤滑剤が半固体状のグリースである場合は、主にグ
リース基油が増稠剤から分離して流出する。According to this configuration, the lubricant or its component sealed in the lubricant reservoir space 7 oozes out from the fitting surfaces 9 of the inner and outer parts 4a and 4b of the inner race spacer 4 in both axial directions by capillary action. . The lubricant or its component that has oozed out to the side end surface of the inner race spacer 4 flows in the outer diameter direction due to the centrifugal force accompanying the rotation of the inner race spacer 4, and is supplied to the raceway surface of the rolling path 12. When the lubricant is a semi-solid grease, the grease base oil mainly separates from the thickener and flows out.
【0017】この軸受は、このように潤滑剤溜め空間7
に封入した潤滑剤またはその成分が少量ずつ補給される
ので、潤滑寿命が向上する。また、そのため転走経路1
2や、転動体、保持器など部品間に封入する潤滑剤量を
少なくして少量潤滑にでき、したがって攪拌抵抗による
発熱が低下すると共に、なじみを良くするための慣らし
運転所要時間が短縮される。This bearing is provided with the lubricant reservoir space 7 as described above.
The lubrication life is improved because the lubricant or its components enclosed therein are replenished little by little. Also, rolling path 1
2, a small amount of lubricant can be lubricated between parts such as rolling elements and cages, so that a small amount of lubrication can be achieved. Therefore, heat generation due to agitation resistance is reduced, and the time required for running-in to improve familiarity is reduced. .
【0018】転走経路12における潤滑油量が不足した
ときは、不足量が僅かであっても軸受温度が上昇する
が、内輪間座4の外周部品4bの線膨張係数が内周部品
4aよりも大きいために、温度上昇に伴って嵌合面9の
締め代が減少する。そのため潤滑剤の供給量が増え、潤
滑不足が解消される。したがって、潤滑不足による焼付
きが防止される。これらの効果のために、この軸受は工
作機械の主軸用軸受等のように、低温度上昇で高速回転
の部位に適する。When the amount of lubricating oil in the rolling path 12 is insufficient, the bearing temperature rises even if the amount is insufficient, but the linear expansion coefficient of the outer part 4b of the inner race spacer 4 is larger than that of the inner part 4a. Therefore, the interference of the fitting surface 9 decreases as the temperature rises. Therefore, the supply amount of the lubricant increases, and the lack of lubrication is eliminated. Therefore, seizure due to insufficient lubrication is prevented. Due to these effects, this bearing is suitable for a portion that rotates at high temperature and rotates at high speed, such as a bearing for a main shaft of a machine tool.
【0019】図3および図4は他の実施例を示す。この
例は、嵌合面9に微小溝9aを形成したものである。こ
の微小溝9aは、内周部品4aと外周部品4bの何れに
設けても良いが、この実施例では図4に斜線で示すよう
に内周部品4aに設けてある。微小溝9aは、内周部品
4aの厚肉部分の全長にわたって軸方向に設けられ、か
つ周方向複数箇所に設けられる。微小溝9aの深さは、
回転が止まっている場合に潤滑剤が自らの表面張力によ
り流れ出すことなく保持される程度の深さであり、0.
1mm以下が好ましい。例えば、0.03〜0.05mm程
度の溝深さに形成される。溝幅は、例えば0.2mm程度
に形成される。微小溝9aの加工は、エッチングまたは
転造等により行われる。その他の構成は前記実施例と同
様である。FIGS. 3 and 4 show another embodiment. In this example, a small groove 9a is formed on the fitting surface 9. The minute grooves 9a may be provided in either the inner peripheral part 4a or the outer peripheral part 4b, but in this embodiment, they are provided in the inner peripheral part 4a as shown by oblique lines in FIG. The minute grooves 9a are provided in the axial direction over the entire length of the thick portion of the inner peripheral part 4a, and are provided at a plurality of positions in the circumferential direction. The depth of the minute groove 9a is
The depth is such that when the rotation is stopped, the lubricant is held without flowing out due to its own surface tension.
It is preferably 1 mm or less. For example, it is formed with a groove depth of about 0.03 to 0.05 mm. The groove width is formed, for example, to about 0.2 mm. The processing of the minute grooves 9a is performed by etching or rolling. Other configurations are the same as those in the above embodiment.
【0020】このように嵌合面9に微小溝9aを形成し
た場合は、嵌合面の面粗さよる隙間を流路とする場合に
比べて、潤滑剤またはその成分が、毛細管現象により微
小溝9aの全体に容易に満たされた状態になる。そのた
め、回転速度が遅い場合でも潤滑剤の滲み出しが容易と
なって、低速回転で使用する場合の潤滑寿命が向上す
る。また、この実施例の場合も、内輪間座4の外周部品
4bの線膨張係数が内周部品4aよりも大きいことによ
り、潤滑不足が生じた場合の温度上昇による供給量増加
が行われ、確実な焼き付き防止効果が得られる。When the minute groove 9a is formed in the fitting surface 9 as described above, the lubricant or its component is minutely formed due to the capillary phenomenon as compared with the case where the gap formed by the surface roughness of the fitting surface is used as the flow path. The entire groove 9a is easily filled. Therefore, even when the rotation speed is low, the bleeding of the lubricant becomes easy, and the lubrication life when using at low speed rotation is improved. Also in the case of this embodiment, since the linear expansion coefficient of the outer peripheral part 4b of the inner race spacer 4 is larger than that of the inner peripheral part 4a, the supply amount is increased due to the temperature rise when insufficient lubrication occurs. A good image sticking prevention effect is obtained.
【0021】なお、前記各実施例は、いずれも潤滑剤溜
め空間7を環状に形成したが、潤滑剤溜め空間7は周方
向の複数個所に分割して形成しても良い。また、この考
案は、複列のアンギュラ玉軸受に限らず、単列のアンギ
ュラ玉軸受や、その他の転がり軸受一般に適用できる。In each of the above embodiments, the lubricant storage space 7 is formed in an annular shape, but the lubricant storage space 7 may be divided into a plurality of portions in the circumferential direction. In addition, the present invention is applicable not only to double-row angular contact ball bearings but also to single-row angular contact ball bearings and other rolling bearings in general.
【0022】[0022]
【考案の効果】この考案の転がり軸受は、内部に潤滑剤
溜め空間を有する内輪間座を設け、この内輪間座を互い
に嵌合する内周部品と外周部品とで構成してその嵌合面
を潤滑剤流出路としたため、潤滑剤溜め空間に封入した
潤滑剤またはその成分が、毛細管現象や内輪間座の回転
に伴う遠心力により転動体付近に自然補給される。その
ため、少量ずつ長時間に渡って潤滑剤の補給が行われ、
優れた潤滑耐久性が得られる。しかも、前記外周部品を
内周部品に比べて線膨張係数が大きい材質のものとした
ため、潤滑不足等で軸受温度が上昇したときに、潤滑剤
流出路となる嵌合面の隙間が大きくなって供給量が増
え、確実な焼付き防止が行える。The rolling bearing according to the present invention is provided with an inner race spacer having a lubricant reservoir space therein, and the inner race spacer is composed of an inner peripheral part and an outer peripheral part which are fitted to each other, and a fitting surface thereof. Is used as the lubricant outflow passage, so that the lubricant or its component sealed in the lubricant reservoir space is naturally replenished to the vicinity of the rolling element by a capillary phenomenon or centrifugal force caused by rotation of the inner ring spacer. Therefore, the lubricant is replenished little by little over a long period of time,
Excellent lubrication durability is obtained. In addition, since the outer part is made of a material having a larger linear expansion coefficient than the inner part, when the bearing temperature rises due to insufficient lubrication or the like, the gap between the fitting surfaces serving as the lubricant outflow path increases. The supply amount increases and seizure can be reliably prevented.
【図1】この考案の一実施例の部分断面図である。FIG. 1 is a partial cross-sectional view of one embodiment of the present invention.
【図2】その部分拡大図である。FIG. 2 is a partially enlarged view of FIG.
【図3】この考案の他の実施例の部分断面図である。FIG. 3 is a partial cross-sectional view of another embodiment of the present invention.
【図4】その内輪間座の内周部品の斜視図である。FIG. 4 is a perspective view of an inner peripheral part of the inner race spacer.
2…内輪、3…外輪、4…内輪間座、4a…内周部品、
4b…外周部品、5…転動体、6…保持器、7…潤滑剤
溜め空間、9…嵌合面、10…スリット、11…潤滑剤
流出路2 ... inner ring, 3 ... outer ring, 4 ... inner ring spacer, 4a ... inner peripheral parts,
4b: peripheral parts, 5: rolling element, 6: retainer, 7: lubricant storage space, 9: fitting surface, 10: slit, 11: lubricant outflow path
Claims (1)
周部品で形成されて両部品間に潤滑剤溜め空間を有する
内輪間座を設け、前記内周部品と外周部品の嵌合面を介
して前記潤滑剤溜め空間から転動体の転走路付近に開通
する微小な潤滑剤流出路を設け、前記外周部品を内周部
品に比べて線膨張係数の大きな材質とした転がり軸受。An inner ring spacer formed of an inner peripheral part and an outer peripheral part which fits inside and outside each other and has a lubricant reservoir space between both parts is provided, and an inner ring spacer is provided between the inner peripheral part and the outer peripheral part through a fitting surface of the inner peripheral part and the outer peripheral part. A small lubricant outflow passage extending from the lubricant storage space to the vicinity of the rolling path of the rolling element, wherein the outer peripheral component is made of a material having a larger linear expansion coefficient than the inner peripheral component.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10656191U JP2540977Y2 (en) | 1991-11-29 | 1991-11-29 | Rolling bearing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10656191U JP2540977Y2 (en) | 1991-11-29 | 1991-11-29 | Rolling bearing |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0547547U JPH0547547U (en) | 1993-06-25 |
JP2540977Y2 true JP2540977Y2 (en) | 1997-07-09 |
Family
ID=14436724
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10656191U Expired - Fee Related JP2540977Y2 (en) | 1991-11-29 | 1991-11-29 | Rolling bearing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2540977Y2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7153030B2 (en) | 2003-12-25 | 2006-12-26 | Fanuc Ltd | Rolling bearing system |
-
1991
- 1991-11-29 JP JP10656191U patent/JP2540977Y2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7153030B2 (en) | 2003-12-25 | 2006-12-26 | Fanuc Ltd | Rolling bearing system |
Also Published As
Publication number | Publication date |
---|---|
JPH0547547U (en) | 1993-06-25 |
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