JP2009210094A - Rolling bearing with grease sump - Google Patents

Rolling bearing with grease sump Download PDF

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JP2009210094A
JP2009210094A JP2008056142A JP2008056142A JP2009210094A JP 2009210094 A JP2009210094 A JP 2009210094A JP 2008056142 A JP2008056142 A JP 2008056142A JP 2008056142 A JP2008056142 A JP 2008056142A JP 2009210094 A JP2009210094 A JP 2009210094A
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grease
grease reservoir
rolling bearing
base oil
raceway
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JP2008056142A
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Japanese (ja)
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Futoshi Kosugi
太 小杉
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2008056142A priority Critical patent/JP2009210094A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing with a grease sump, capable of attaining a high speed, the long service life and maintenance-free, capable of shortening a dimension in the axial direction of the whole, and capable of supplying a proper quantity of base oil to a raceway surface of a fixed side bearing ring, by using only grease in the grease sump. <P>SOLUTION: This rolling bearing with the grease sump is composed of a rolling bearing 6 and a grease sump forming part 7. The rolling bearing 6 has an inner ring 1, an outer ring 2 and a rolling element 3. For example, the fixed side bearing ring is formed as the outer ring 2. The outer ring 2 is formed so that an end surface 2b on the opposed side to the grease sump forming part 7 is set to a width dimension being a position in the axial direction continuing with the raceway surface 2a. The grease sump forming part 7 is formed as a grease sump 10 on the inside, and has a base oil discharge clearance 11 continuing with the grease sump 10, opening in the vicinity of the raceway surface 2a of the outer ring 2 and discharging base oil of grease in the grease sump 10, in the end part on the opposed side to the outer ring 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、工作機械主軸等のグリース潤滑とされるグリース溜まり付き転がり軸受に関する。   The present invention relates to a rolling bearing with a grease reservoir used as grease lubrication for a machine tool main shaft or the like.

工作機械主軸軸受の潤滑方法として、メンテナンスフリーで使用可能なグリース潤滑、搬送エアに潤滑オイルを混合してオイルをノズルより軸受内に噴射するエアオイル潤滑、軸受内に潤滑油を直接に噴射するジェット潤滑等の方法がある。最近の工作機械は、加工能率を上げるために、ますます高速化の傾向にあり、主軸軸受の潤滑も比較的安価で簡単に高速化が可能なエアオイル潤滑が多く用いられてきている。しかし、このエアオイル潤滑法は、付帯設備としてエアオイル供給装置が必要であることと、多量のエアを必要とすることから、コスト、騒音、省エネ、省資源の観点から問題がある。また、オイルの飛散によって環境を悪化させる問題もある。これらの問題を回避するために、最近ではグリース潤滑による高速化が注目され始め、要望も多くなってきている。   As a lubrication method for machine tool spindle bearings, grease lubrication that can be used maintenance-free, air-oil lubrication in which lubricating oil is mixed with carrier air and oil is injected into the bearing from the nozzle, jet that injects lubricating oil directly into the bearing There are methods such as lubrication. In recent machine tools, in order to increase machining efficiency, there is a tendency for higher speed, and lubrication of main shaft bearings is also relatively inexpensive and air-oil lubrication that can be speeded up easily is often used. However, this air oil lubrication method has a problem from the viewpoint of cost, noise, energy saving, and resource saving because it requires an air oil supply device as ancillary equipment and requires a large amount of air. There is also a problem of deteriorating the environment due to the scattering of oil. In order to avoid these problems, recently, speeding up by grease lubrication has begun to attract attention, and requests are increasing.

グリース潤滑は、軸受組立時に封入されたグリースのみで潤滑するため、使用条件によっては、軸受発熱によるグリースの劣化や、軌道面での油膜切れのため、早期焼き付きに至ってしまうことが考えられる。特に、dn値が100万(軸受内径mm×回転数rpm)を超えるような高速回転領域では、何万時間ものグリース寿命を保証するのは困難である。   Since grease lubrication is performed only with the grease enclosed at the time of bearing assembly, depending on the use conditions, it is considered that grease is deteriorated due to bearing heat generation and oil film is cut off on the raceway surface, resulting in early seizure. In particular, it is difficult to guarantee a grease life of tens of thousands of hours in a high-speed rotation region where the dn value exceeds 1,000,000 (bearing inner diameter mm × rotational speed rpm).

その対策としてのグリース寿命を延長させる手段が、特許文献1に紹介されている。特許文献1に記載の転がり軸受は、図6に示すように、内輪21および外輪22のうち、回転しない固定側軌道輪(例えば外輪)22は段差面22bを有し、この段差面22bに先端が隙間23を介して対面するグリース溜まり形成部品24を備えている。グリース溜まり形成部品24は、固定側軌道輪22およびその位置決め間座25との間に、グリース溜まり26および流路27が形成されている。軸受運転時には、グリース溜まり26内のグリースから分離した基油が、流路27を通り隙間23から軸受空間に吐出されて、隙間23に隣接する固定側軌道輪22の軌道面22aに供給される。隙間23のギャップ量δを適正に設定することで、固定側軌道輪22の軌道面22aに供給される基油量を管理している。
特開2006−182917号公報
Means for extending the grease life as a countermeasure is introduced in Patent Document 1. In the rolling bearing described in Patent Document 1, as shown in FIG. 6, of the inner ring 21 and the outer ring 22, the non-rotating fixed raceway ring (for example, the outer ring) 22 has a step surface 22 b, and a tip is formed on the step surface 22 b. Is provided with a grease reservoir forming component 24 facing through a gap 23. In the grease reservoir forming component 24, a grease reservoir 26 and a flow path 27 are formed between the fixed side race 22 and its positioning spacer 25. During the bearing operation, the base oil separated from the grease in the grease reservoir 26 passes through the flow path 27, is discharged from the gap 23 to the bearing space, and is supplied to the raceway surface 22 a of the fixed-side bearing ring 22 adjacent to the gap 23. . By appropriately setting the gap amount δ of the gap 23, the amount of base oil supplied to the raceway surface 22a of the fixed-side raceway ring 22 is managed.
JP 2006-182917 A

上記転がり軸受は、内輪21および外輪22の軸方向寸法がそれぞれ同じである転がり軸受本体に、グリース溜まり形成部品24を隣接させ軸方向に並べて配置した構成であるため、必然的に全体の軸方向寸法が長くなるという問題があった。工作機械主軸にはコンパクトさが求められており、グリース潤滑機能を備えた転がり軸受の場合にも、軸方向寸法を抑えることが求められる。   The rolling bearing has a configuration in which the grease pool forming components 24 are arranged adjacent to each other in the axial direction of the rolling bearing body in which the inner ring 21 and the outer ring 22 have the same axial dimension. There was a problem that the dimension became long. Machine tool spindles are required to be compact, and in the case of a rolling bearing having a grease lubrication function, it is required to suppress the axial dimension.

また、前記隙間ギャップ量δの寸法精度を確保するには、軸受の各部品の寸法を予め測定しておき、これら各部品を正確に組立てることが必要である。しかし、上記転がり軸受は、固定側軌道輪22の段差面22bとグリース溜まり形成部品24の先端面との間に基油吐出用の隙間23が形成されるため、組立時に隙間23を目視で確認することができない。そのため、隙間ギャップ量δの寸法精度を確保することが難しい。   Further, in order to ensure the dimensional accuracy of the gap gap amount δ, it is necessary to measure the dimensions of each component of the bearing in advance and to assemble these components accurately. However, since the rolling bearing has a base oil discharge gap 23 formed between the stepped surface 22b of the stationary race 22 and the tip surface of the grease reservoir forming component 24, the gap 23 is visually checked during assembly. Can not do it. Therefore, it is difficult to ensure the dimensional accuracy of the gap gap amount δ.

この発明の目的は、グリース溜まり内のグリースだけを使用して高速化と長寿命化、メンテナンスフリーを達成でき、また全体の軸方向寸法が短いグリース溜まり付き転がり軸受を提供することである。
この発明の他の目的は、基油吐出用の隙間の寸法精度が高く、固定側軌道輪の軌道面に適正な量の基油を供給することができ、組立が容易なグリース溜まり付き転がり軸受とすることである。
SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing with a grease reservoir that can achieve high speed, long life, and maintenance-free by using only the grease in the grease reservoir, and has a short overall axial dimension.
Another object of the present invention is a rolling bearing with a grease reservoir, which has high dimensional accuracy of the gap for discharging the base oil, can supply an appropriate amount of base oil to the raceway surface of the fixed side raceway, and is easy to assemble. It is to do.

この発明にかかるグリース溜まり付き転がり軸受は、内輪、外輪、およびこれら内外輪の軌道面間に介在する複数の転動体を有する転がり軸受と、この転がり軸受に対して、軌道輪である内輪および外輪のうち、回転しない固定側軌道輪に隣接させ軸方向に並べて配置される環状のグリース溜まり形成部品とでなり、前記固定側軌道輪の前記グリース溜まり形成部品に対向する側の端面は、この固定側軌道輪の軌道面に続いて形成され、前記固定側軌道輪は、前記グリース溜まり形成部品に対向する側の端面が、この固定側軌道輪の軌道面に続く軸方向位置となる幅寸法とされ、前記固定側軌道輪に対向する側の端部に、前記グリース溜まりに続き、前記固定側軌道輪の軌道面の近傍に開口してグリース溜まり内のグリースの基油を吐出する基油吐出隙間を有することを特徴とする。   A rolling bearing with a grease reservoir according to the present invention includes a rolling bearing having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings, and an inner ring and an outer ring that are race rings with respect to the rolling bearing. Among them, an annular grease pool forming component that is arranged adjacent to the non-rotating fixed side raceway and arranged in the axial direction, and the end surface of the fixed side raceway facing the grease pool formation component is fixed. The fixed side raceway is formed following the raceway surface of the side raceway, and the fixed side raceway has a width dimension such that an end surface facing the grease reservoir forming component is an axial position following the raceway surface of the fixed side raceway ring. Then, at the end facing the fixed-side raceway, the grease reservoir is opened in the vicinity of the raceway surface of the fixed-side raceway, and the grease base oil in the grease reservoir is discharged. And having an oil discharge gap.

この構成のグリース溜まり付き転がり軸受は、グリース溜まりにグリースを充填して使用される。転がり軸受の運転と停止に伴うグリース溜まりでのヒートサイクルによる圧力変動で、グリースから分離した基油が基油吐出隙間から軸受空間に吐出されて、固定側軌道輪の軌道面に供給される。これにより、軸受内に封入したグリースだけを使用して高速化と長寿命化、メンテナンスフリーを達成できる。   The rolling bearing with a grease reservoir having this configuration is used by filling the grease reservoir with grease. The base oil separated from the grease is discharged from the base oil discharge gap into the bearing space by the pressure fluctuation caused by the heat cycle in the grease pool accompanying the operation and stop of the rolling bearing, and is supplied to the raceway surface of the stationary side race ring. As a result, only the grease enclosed in the bearing can be used to achieve high speed, long life, and maintenance-free.

固定側軌道輪は、グリース溜まり形成部品に対向する側の端面が、この固定側軌道輪の軌道面に続く軸方向位置となる幅寸法とされているため、固定側軌道輪の幅寸法を短くできる。その幅寸法の短い固定側軌道輪にグリース溜まり形成部品が隣接させ軸方向に並べて配置されているため、グリース溜まり付き転がり軸受全体の軸方向寸法が短くなる。   The fixed-side bearing ring has a width dimension at which the end surface facing the grease reservoir forming component is an axial position following the raceway surface of the fixed-side bearing ring. it can. Since the grease reservoir forming parts are arranged adjacent to the fixed-side bearing ring having a short width dimension and arranged side by side in the axial direction, the axial dimension of the entire rolling bearing with grease reservoir is shortened.

この発明において、前記基油吐出隙間は、前記グリース溜まり形成部品のみで形成されているのが望ましい。
基油吐出隙間がグリース溜まり形成部品のみで形成されていれば、グリース溜まり形成部品の製作時に最終的な基油吐出隙間のギャップ量を確認できる。そのため、基油吐出隙間の寸法精度が高まり、固定側軌道輪の軌道面に適正な量の基油を供給できると共に、転がり軸受とグリース溜まり形成部品との組立時の基油吐出隙間の寸法管理が不要となり、組立が容易になる。
In the present invention, it is desirable that the base oil discharge gap is formed only by the grease reservoir forming component.
If the base oil discharge gap is formed of only the grease reservoir forming part, the final gap amount of the base oil discharge gap can be confirmed when the grease reservoir forming part is manufactured. As a result, the dimensional accuracy of the base oil discharge gap is increased, and an appropriate amount of base oil can be supplied to the raceway surface of the stationary side raceway, and the size control of the base oil discharge gap during assembly of the rolling bearing and the grease reservoir forming component is possible. Becomes unnecessary, and assembly becomes easy.

この発明において、前記固定側軌道輪の前記グリース溜まり形成部品に対向する側の端面と軌道面との接触箇所の軸方向位置は、軌道輪である内輪および外輪のうち、回転する回転側軌道輪の前記グリース溜まり形成部品側の端面と軌道面の中心との間とするのが良い。
前記固定側軌道輪の前記接触箇所の軸方向位置を、回転側軌道輪の前記グリース溜まり形成部品側の端面と軌道面の中心との間にすると、前記固定側軌道輪の軌道面を狭くすることなく、前記固定側軌道輪の幅寸法を短くできる。それにより、グリース溜まり付き転がり軸受全体の軸方向寸法を短くできる。
In this invention, the axial position of the contact portion between the end surface of the fixed side raceway facing the grease reservoir forming part and the raceway surface is the rotating side raceway that rotates among the inner race and outer race that are raceways. It is preferable to be between the end surface on the grease reservoir forming component side and the center of the raceway surface.
When the axial position of the contact portion of the fixed side raceway is between the end surface of the rotation side raceway on the grease reservoir forming component side and the center of the raceway surface, the raceway surface of the fixed side raceway is narrowed. Without this, the width dimension of the fixed-side race can be shortened. Thereby, the axial dimension of the entire rolling bearing with a grease reservoir can be shortened.

この発明において、前記基油吐出隙間は、円周方向の全周または一部に設けられ、そのギャップ量は円周方向のどの部分でも均一とすることができる。
基油吐出隙間は円周方向の全周または一部に設ければよいが、一部に設ける場合は、基油吐出量が円周方向でなるべく均等になるように、複数の基油吐出隙間を円周方向になるべく均等に分散して配置するのが好ましい。また、基油吐出隙間のギャップ量を円周方向のどの部分でも均一にすることによっても、基油吐出量の円周方向の均等化を図ることができる。
In the present invention, the base oil discharge gap is provided on the entire circumference or a part of the circumference, and the gap amount can be uniform in any part of the circumference.
The base oil discharge gap may be provided on the entire circumference or a part of the circumference, but if it is provided on a part of the circumference, a plurality of base oil discharge gaps are provided so that the base oil discharge amount is as uniform as possible in the circumferential direction. Are preferably distributed as evenly as possible in the circumferential direction. Further, the base oil discharge amount can be equalized in the circumferential direction by making the gap amount of the base oil discharge gap uniform in any part in the circumferential direction.

この発明において、前記グリース溜まり形成部品は、内径側部品分割体と外径側部品分割体とを接合してなり、両部品分割体間に前記基油吐出隙間が形成されたものであり、前記内径側部品分割体および外径側部品分割体のうち、前記固定側軌道輪に接しない部品分割体を樹脂製とすることができる。
グリース溜まり形成部品が内径側部品分割体と外径側部品分割体とでなる場合、固定転側軌道輪に接する部品分割体は、固定側軌道輪の間座としての機能を有するため、剛性の大きい金属製であることが望ましいが、固定側軌道輪に接しない部品分割体は、間座としての機能を有しないので、樹脂製とすることができる。
In this invention, the grease pool forming component is formed by joining an inner diameter side component divided body and an outer diameter side component divided body, and the base oil discharge gap is formed between the two component divided bodies. Of the inner diameter side part division body and the outer diameter side part division body, the part division body that does not contact the fixed-side bearing ring can be made of resin.
When the grease pool forming part is composed of an inner diameter side part split body and an outer diameter side part split body, the part split body in contact with the fixed rotation side raceway ring has a function as a spacer of the fixed side raceway ring. Although it is desirable that it is made of a large metal, the component divided body that does not contact the stationary side race ring does not have a function as a spacer, and therefore can be made of resin.

前記転がり軸受が玉軸受であっても良い。
この発明は、転がり軸受が玉軸受である場合に良好に適用できるが、転がり軸受が玉軸受でない場合にも適用できる。
The rolling bearing may be a ball bearing.
The present invention can be applied well when the rolling bearing is a ball bearing, but can also be applied when the rolling bearing is not a ball bearing.

前記固定側軌道輪が外輪であっても良い。
この発明は、固定側軌道輪が外輪である場合に良好に適用できるが、固定側軌道輪が内輪である場合にも適用できる。
The stationary raceway ring may be an outer ring.
The present invention can be satisfactorily applied when the fixed-side track ring is an outer ring, but can also be applied when the fixed-side track ring is an inner ring.

この発明のグリース溜まり付き転がり軸受は、内輪、外輪、およびこれら内外輪の軌道面間に介在する複数の転動体を有する転がり軸受と、この転がり軸受に対して、軌道輪である内輪および外輪のうち、回転しない固定側軌道輪に隣接させ軸方向に並べて配置される環状のグリース溜まり形成部品とでなり、前記固定側軌道輪の前記グリース溜まり形成部品に対向する側の端面は、この固定側軌道輪の軌道面に続いて形成され、前記固定側軌道輪は、前記グリース溜まり形成部品に対向する側の端面が、この固定側軌道輪の軌道面に続く軸方向位置となる幅寸法とされ、前記固定側軌道輪に対向する側の端部に、前記グリース溜まりに続き、前記固定側軌道輪の軌道面の近傍に開口してグリース溜まり内のグリースの基油を吐出する基油吐出隙間を有するため、グリース溜まり内のグリースだけを使用して高速化と長寿命化、メンテナンスフリーを達成でき、また全体の軸方向寸法を短くできる。   A rolling bearing with a grease reservoir according to the present invention includes a rolling bearing having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceway surfaces of the inner and outer rings, and an inner ring and an outer ring that are race rings with respect to the rolling bearing. Of these, an annular grease pool forming component is arranged adjacent to the non-rotating fixed side raceway and arranged in the axial direction. The end surface of the fixed side raceway facing the grease pool formation component is the fixed side. Formed on the raceway surface of the bearing ring, and the fixed-side raceway has a width dimension such that an end surface facing the grease reservoir forming part is an axial position following the raceway surface of the fixed-side raceway. A base oil outlet that opens to the end of the fixed-side raceway, in the vicinity of the raceway surface of the fixed-side raceway, and discharges the base oil of the grease in the grease reservoir at the end facing the fixed-side raceway. Since a gap, speed and long life by using only the grease in the grease reservoir, can achieve maintenance-free and the axial dimension of the entire can be shortened.

また、前記基油吐出隙間が前記グリース溜まり形成部品のみで形成されている場合は、基油吐出隙間の寸法精度が高く、固定側軌道輪の軌道面に適正な量の基油を供給することができ、組立が容易である。   In addition, when the base oil discharge gap is formed only by the grease reservoir forming parts, the dimensional accuracy of the base oil discharge gap is high, and an appropriate amount of base oil is supplied to the raceway surface of the stationary side race ring. Can be assembled easily.

この発明の実施形態を図1および図2と共に説明する。図1はグリース溜まり付き転がり軸受の組立状態を示し、図2は分解状態を示す。このグリース溜まり付き転がり軸受は、内輪1、外輪2、およびこれら内外輪1,2の軌道面1a,2a間に介在する複数の転動体3を有する転がり軸受6と、この転がり軸受6の外輪2に隣接させ軸方向に並べて配置されるグリース溜まり形成部品7とでなる。複数の転動体3は、保持器4に保持され、内外輪1,2間の軸受空間の一端は、シール5によって密封されている。転がり軸受6はアンギュラ玉軸受であり、グリース溜まり形成部品7は軸受正面側に設けられ、シール5は軸受背面側の端部に設けられる。軸受正面側ではグリース溜まり形成部品7がシールを兼ねており、軸受正面側からの潤滑油漏れが防止される。図において、交差したハッチングで示す部分は、グリースの充填された部分を示す。内輪1は、図示しない主軸に嵌合して回転可能とされ、外輪2はスピンドルユニットにおける図示しないハウジングの内周に嵌合状態で固定支持される。   An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an assembled state of a rolling bearing with a grease reservoir, and FIG. 2 shows an exploded state. This rolling bearing with a grease reservoir includes a rolling bearing 6 having an inner ring 1, an outer ring 2, and a plurality of rolling elements 3 interposed between the raceway surfaces 1 a and 2 a of the inner and outer rings 1 and 2, and the outer ring 2 of the rolling bearing 6. And a grease reservoir forming component 7 that is arranged adjacent to each other in the axial direction. The plurality of rolling elements 3 are held by a cage 4, and one end of the bearing space between the inner and outer rings 1 and 2 is sealed with a seal 5. The rolling bearing 6 is an angular ball bearing, the grease reservoir forming component 7 is provided on the front side of the bearing, and the seal 5 is provided on the end on the back side of the bearing. On the front side of the bearing, the grease reservoir forming part 7 also serves as a seal, and lubricating oil leakage from the front side of the bearing is prevented. In the figure, the portion indicated by crossed hatching indicates a portion filled with grease. The inner ring 1 is fitted to a main shaft (not shown) to be rotatable, and the outer ring 2 is fixedly supported in a fitted state on the inner periphery of a housing (not shown) in the spindle unit.

回転側軌道輪である内輪1は、軌道面1aから軸方向両側に離れた位置に軸受正面側および背面側の端面1b,1cが形成されている。対して、固定側軌道輪である外輪2は、軌道面2aから軸方向に離れた位置に軸受背面側の端面2cが形成され、かつ軌道面2aに続いて軸受正面側の端面2bが形成されている。軸受正面側の端面2bは、グリース溜まり形成部品7に対向する側の端面である。軸受正面側の端面2bと軌道面2aとの接触箇所の軸方向位置は、内輪1の軸方向正面側の端面1bと軌道面1aの中心との間とされている。軸方向正面側の端面1bは、グリース溜まり形成部品7側の端面である。外輪2の幅寸法(軸方向寸法)は、内輪1の幅寸法(軸方向寸法)と比べて、端面2bと軌道面2a間に円筒部分を有しない分だけ短い。この例では、外輪2の軸受正面側の端面2bは、径方向に沿う面とされているが、径方向に対して斜めになっていてもよい。 The inner ring 1 that is a rotation-side raceway has end faces 1b and 1c on the front and back sides of the bearing at positions away from the raceway surface 1a on both sides in the axial direction. On the other hand, the outer ring 2 which is a fixed-side raceway has an end surface 2c on the bearing back side formed at a position away from the raceway surface 2a in the axial direction, and an end surface 2b on the bearing front side is formed following the raceway surface 2a. ing. The end surface 2 b on the bearing front side is an end surface facing the grease reservoir forming component 7. The axial position of the contact portion between the end surface 2b on the bearing front side and the raceway surface 2a is between the end surface 1b on the axially front side of the inner ring 1 and the center of the raceway surface 1a. The end surface 1b on the front side in the axial direction is an end surface on the grease reservoir forming component 7 side. The width dimension (axial dimension) of the outer ring 2 is shorter than the width dimension (axial dimension) of the inner ring 1 to the extent that there is no cylindrical portion between the end surface 2b and the raceway surface 2a. In this example, the end surface 2b on the bearing front side of the outer ring 2 is a surface along the radial direction, but may be inclined with respect to the radial direction.

グリース溜まり形成部品7は環状の部品であり、内部がグリース溜まり10として形成され、外輪2に対向する側の端部に、前記グリース溜まり10に続き、外輪2の軌道面2aの近傍に開口してグリース溜まり10内のグリースの基油を吐出する基油吐出隙間11を有する。グリース溜まり形成部品7は、内輪1の軸受正面側の端面1bよりも軸受背面側に位置する軸受内部分7aと、軸受正面側に位置する軸受外部分7bとでなり、軸受内部分7aの先端面7aaが外輪2の軸受正面側の端面2bに当接している。外径は軸受内部分7aおよび軸受外部分7b共に同じであるが、内径は軸受内部分7aよりも軸受外部分7bの方が小さい。   The grease reservoir forming component 7 is an annular component, and the inside is formed as a grease reservoir 10. The grease reservoir forming component 7 is open to the end of the outer ring 2 on the side facing the outer ring 2, following the grease reservoir 10 and in the vicinity of the raceway surface 2 a of the outer ring 2. And a base oil discharge gap 11 for discharging the base oil of the grease in the grease reservoir 10. The grease reservoir forming component 7 is composed of a bearing inner portion 7a located on the bearing back side with respect to the end surface 1b on the bearing front side of the inner ring 1 and a bearing outer portion 7b located on the bearing front side, and the tip of the bearing inner portion 7a. The surface 7aa is in contact with the end surface 2b of the outer ring 2 on the bearing front side. The outer diameter is the same for both the bearing inner part 7a and the bearing outer part 7b, but the inner diameter is smaller in the bearing outer part 7b than in the bearing inner part 7a.

前記基油吐出隙間11は、グリース溜まり形成部品7のみで形成され、軸受内部分7aの内周側先端近傍に開口している。この実施形態では、基油吐出隙間11は径方向に沿う隙間とされている。基油吐出隙間11は、例えば円周方向の全周に設けられるが、円周方向の一部分にだけ設けたものとしてもよい。円周方向の一部分にだけ設ける場合、複数の基油吐出隙間11を円周方向に均等に分散させて配置しておくのが好ましい。基油吐出隙間11のギャップ量δは、円周方向のどの部分でも均一であり、例えば50μm程度とされている。このギャップ量δの寸法は、基油吐出隙間11に毛細管現象を作用させることができる寸法である。   The base oil discharge gap 11 is formed only by the grease reservoir forming part 7 and is open near the tip on the inner peripheral side of the bearing inner portion 7a. In this embodiment, the base oil discharge gap 11 is a gap along the radial direction. The base oil discharge gap 11 is provided, for example, on the entire circumference in the circumferential direction, but may be provided only on a portion in the circumferential direction. When providing only in a part in the circumferential direction, it is preferable to dispose the plurality of base oil discharge gaps 11 so as to be evenly distributed in the circumferential direction. The gap amount δ of the base oil discharge gap 11 is uniform in any part in the circumferential direction, and is, for example, about 50 μm. The dimension of the gap amount δ is a dimension that allows a capillary phenomenon to act on the base oil discharge gap 11.

グリース溜まり形成部品7は、内径側部品分割体13と外径側部品分割体14とを接合したものであり、内径側部品分割体13の軸受背面側の先端と外径側部品分割体14の軸受背面側端から内径側に延びる鍔部14aの内径端との間に前記基油吐出隙間11が形成されている。また、内径側部品分割体13は、軸受正面側端から外径側に延びる鍔部13aを有し、この鍔部13aを外径側部品分割体14の軸受正面側端付近に形成された段部14bに係合させて、両部品分割体13,14が互いに接合されている。外径側部品分割体14は、外輪2の位置決め間座としての役割を有するため、剛性の大きい鉄等の金属製とされている。対して、内径側部品分割体13は、位置決め間座としての役割を有しないので、金属以外の材料、例えば樹脂製とすることができる。   The grease pool forming component 7 is formed by joining the inner diameter side component division 13 and the outer diameter side component division 14, and the tip of the inner diameter side component division 13 on the bearing back side and the outer diameter side component division 14. The base oil discharge gap 11 is formed between the bearing back side end and the inner diameter end of the flange portion 14a extending to the inner diameter side. Further, the inner diameter side component divided body 13 has a flange portion 13 a extending from the bearing front side end to the outer diameter side, and the flange portion 13 a is formed in the vicinity of the bearing front side end of the outer diameter side component divided body 14. The parts divided bodies 13 and 14 are joined to each other by engaging with the portion 14b. Since the outer diameter side component divided body 14 has a role as a positioning spacer for the outer ring 2, it is made of metal such as iron having high rigidity. On the other hand, since the inner diameter side component divided body 13 does not have a role as a positioning spacer, it can be made of a material other than metal, for example, resin.

このグリース溜まり付き転がり軸受の作用を説明する。軸受内には、初期潤滑用としてグリースを封入しておく。軸受を運転すると、運転時の温度上昇により、グリース溜まり10内のグリースが膨張率の異なる基油と増稠剤とに分離する。同時に、密閉状態のグリース溜まり部品10の内部圧力が上昇する。この内部圧力の上昇により、分離した基油が基油吐出隙間11から吐出され、外輪2の軌道面2aに供給される。温度が上昇して定常状態になると、内部圧力の上昇要因が消滅するので、基油の吐出と並行して内部圧力が徐々に減じ、単位時間当たりの基油吐出量も減少していく。その後、運転が中止されると、グリース溜まり10の温度も下降し、グリース溜まり10の内部圧力がほぼ大気圧となる。このとき、圧力による基油の吐出は無く、基油吐出隙間11には基油が満たされる。したがって、運転停止状態では、グリース溜まり10は密閉された状態にある。
その後、運転が再開されると、グリース溜まり10の内部圧力が再度上昇する。このような温度上昇と下降のヒートサイクルによって、グリース溜まり10内での圧力変動が繰り返され、グリースから分離した基油が確実に基油吐出隙間11を通って、外輪2の軌道面2aに繰り返し供給される。
The operation of the rolling bearing with the grease reservoir will be described. Grease is sealed in the bearing for initial lubrication. When the bearing is operated, the grease in the grease reservoir 10 is separated into the base oil and the thickener having different expansion rates due to the temperature rise during operation. At the same time, the internal pressure of the grease reservoir component 10 in the sealed state increases. Due to the increase in internal pressure, the separated base oil is discharged from the base oil discharge gap 11 and supplied to the raceway surface 2 a of the outer ring 2. When the temperature rises and reaches a steady state, the internal pressure increase factor disappears, so that the internal pressure gradually decreases in parallel with the base oil discharge, and the base oil discharge amount per unit time also decreases. Thereafter, when the operation is stopped, the temperature of the grease reservoir 10 also decreases, and the internal pressure of the grease reservoir 10 becomes almost atmospheric pressure. At this time, there is no discharge of base oil due to pressure, and the base oil discharge gap 11 is filled with base oil. Therefore, the grease reservoir 10 is in a sealed state in the operation stop state.
Thereafter, when the operation is resumed, the internal pressure of the grease reservoir 10 rises again. By such a heat cycle of temperature rise and fall, pressure fluctuations in the grease reservoir 10 are repeated, and the base oil separated from the grease reliably passes through the base oil discharge gap 11 and is repeatedly applied to the raceway surface 2a of the outer ring 2. Supplied.

また、上記ヒートサイクルによる基油吐出作用とは別に、以下に示す毛細管現象による基油吐出作用も加わる。すなわち、軸受の停止時には、グリース中の増稠剤および基油吐出隙間11の毛細管現象により、グリースの基油が基油吐出隙間11に移動し、この毛細管現象と油の表面張力とが相まって基油吐出隙間11に基油が油状で保持される。軸受を運転すると、基油吐出隙間11に貯油されていた基油は、運転で生じる外輪2の温度上昇による体積膨張と、転動体3の公転・自転で生じる空気流とにより基油吐出隙間11から流出して、外輪2の軌道面2aに付着しながら移動して転動体接触部に連続的に補給される。   In addition to the base oil discharging action by the heat cycle, a base oil discharging action by the capillary action shown below is also added. That is, when the bearing is stopped, the base oil of the grease moves to the base oil discharge gap 11 due to the thickener in the grease and the capillary phenomenon of the base oil discharge gap 11, and the capillary phenomenon and the surface tension of the oil are combined. The base oil is held in oil in the oil discharge gap 11. When the bearing is operated, the base oil stored in the base oil discharge gap 11 is caused by the volume expansion caused by the temperature increase of the outer ring 2 generated by the operation and the air flow generated by the revolution and rotation of the rolling element 3. , Flows while adhering to the raceway surface 2a of the outer ring 2, and is continuously supplied to the rolling element contact portion.

このように、このグリース溜まり付き転がり軸受では、運転停止と運転再開の繰り返しに伴うグリース溜まり10でのヒートサイクルによる圧力変動で、グリースから分離した基油が基油吐出隙間11を通って外輪2の軌道面2aに供給されるので、潤滑油の供給が確実に行われる。加えて、基油吐出隙間11での毛細管現象によっても基油が外輪2の軌道面2aに吐出されるので、潤滑が一層確実なものとなる。これにより、軸受内に封入したグリースだけを使用して高速化と長寿命化、メンテナンスフリー化、および安定した潤滑油供給が可能である。   As described above, in this rolling bearing with a grease reservoir, the base oil separated from the grease passes through the base oil discharge gap 11 due to the pressure fluctuation caused by the heat cycle in the grease reservoir 10 due to the repeated operation stop and restart. Thus, the lubricating oil is reliably supplied. In addition, since the base oil is discharged to the raceway surface 2a of the outer ring 2 also by the capillary phenomenon in the base oil discharge gap 11, lubrication is further ensured. As a result, using only the grease sealed in the bearing, it is possible to increase the speed, extend the service life, eliminate maintenance, and supply a stable lubricant.

基油吐出隙間11はグリース溜まり形成部品7のみで形成されているため、グリース溜まり形成部品7の製作時に最終的な基油吐出隙間11のギャップ量δを確認できる。そのため、基油吐出隙間11の寸法精度が高まり、外輪2の軌道面2aに適正な量の基油を供給できる。また、転がり軸受6とグリース溜まり形成部品7との組立時の基油吐出隙間11の寸法管理が不要であるため、組立が容易である。   Since the base oil discharge gap 11 is formed only by the grease reservoir forming part 7, the final gap amount δ of the base oil discharge gap 11 can be confirmed when the grease reservoir forming part 7 is manufactured. Therefore, the dimensional accuracy of the base oil discharge gap 11 is increased, and an appropriate amount of base oil can be supplied to the raceway surface 2a of the outer ring 2. In addition, since it is not necessary to manage the size of the base oil discharge gap 11 when the rolling bearing 6 and the grease reservoir forming part 7 are assembled, the assembly is easy.

また、外輪2のグリース溜まり形成部品7に対向する側すなわち軸受正面側の端面2bを、この外輪2の軌道面2aに続いて形成したことにより、外輪2の幅寸法が内輪1のそれと比べて短くなっている。その幅寸法の短い外輪2にグリース溜まり形成部品7が隣接させ軸方向に並べて配置されているため、グリース溜まり付き転がり軸受全体の軸方向寸法を短くできる。   Further, the end surface 2b of the outer ring 2 facing the grease reservoir forming component 7, that is, the end surface 2b on the front side of the bearing is formed following the raceway surface 2a of the outer ring 2, so that the width of the outer ring 2 is smaller than that of the inner ring 1. It is getting shorter. Since the grease reservoir forming component 7 is adjacent to the outer ring 2 having a short width and is arranged in the axial direction, the axial dimension of the entire rolling bearing with a grease reservoir can be shortened.

図3は異なる実施形態を示す。このグリース溜まり付き転がり軸受では、グリース溜まり形成部品7の基油吐出隙間11が、出口側にいくに従い軸受背面側に位置するように径方向に対して角度を持った隙間とされている。前記実施形態のように、基油吐出隙間11が径方向に沿う隙間であると、基油吐出隙間11の出口と外輪2の軌道面2aとが若干離れているため、基油吐出隙間11から吐出された基油が軌道面2aに届きにくくなることが懸念される。それに対し、図3のように基油吐出隙間11を径方向に対して角度を持って設けると、基油吐出隙間11の出口と外輪2の軌道面2aとをより一層接近させることができ、基油吐出隙間11から吐出された基油が確実に軌道面2aに届くようにできる。   FIG. 3 shows a different embodiment. In this rolling bearing with a grease pool, the base oil discharge gap 11 of the grease pool forming part 7 is a gap having an angle with respect to the radial direction so as to be located on the bearing rear side as it goes to the outlet side. When the base oil discharge gap 11 is a gap along the radial direction as in the above embodiment, the outlet of the base oil discharge gap 11 and the raceway surface 2a of the outer ring 2 are slightly separated from each other. There is a concern that the discharged base oil is difficult to reach the raceway surface 2a. On the other hand, when the base oil discharge gap 11 is provided at an angle with respect to the radial direction as shown in FIG. 3, the outlet of the base oil discharge gap 11 and the raceway surface 2a of the outer ring 2 can be made closer to each other. It is possible to ensure that the base oil discharged from the base oil discharge gap 11 reaches the raceway surface 2a.

図4はさらに異なる実施形態を示す。前記各実施形態は、基油吐出隙間11がグリース溜まり形成部品7のみで形成されているのに対し、この実施形態は、基油吐出隙間11がグリース溜まり形成部品7と外輪2間に形成されている。具体的には、この実施形態のグリース溜まり付き転がり軸受は、外径側部品分割体14が筒状のまま軸受背面側端まで延びており、その先端面7aaが、外輪2の軸受正面側の端面2bに当接している。つまり、前記各実施形態における鍔部14aを有していない。また、内径側部品分割体13の軸受背面側端が外輪2の端面2bの近傍まで延びており、この内径側部品分割体13の軸受背面側端と外輪2の端面2bとの間に基油吐出隙間11が形成されている。   FIG. 4 shows a further different embodiment. In each of the above embodiments, the base oil discharge gap 11 is formed only by the grease reservoir forming part 7, whereas in this embodiment, the base oil discharge gap 11 is formed between the grease reservoir forming part 7 and the outer ring 2. ing. Specifically, the rolling bearing with a grease reservoir according to this embodiment extends to the bearing rear side end with the outer diameter side component divided body 14 remaining in a cylindrical shape, and its tip end surface 7aa is on the bearing front side of the outer ring 2. It is in contact with the end face 2b. That is, it does not have the collar part 14a in each said embodiment. Further, the bearing back side end of the inner diameter side component division 13 extends to the vicinity of the end surface 2 b of the outer ring 2, and a base oil is provided between the bearing rear side end of the inner diameter side component division 13 and the end surface 2 b of the outer ring 2. A discharge gap 11 is formed.

この構成である場合も、前記各実施形態と同様に、幅寸法の短い外輪2にグリース溜まり形成部品7が隣接させ軸方向に並べて配置されているため、グリース溜まり付き転がり軸受全体の軸方向寸法を短くできる。しかし、前記各実施形態と異なり、基油吐出隙間11がグリース溜まり形成部品7と外輪2とで形成されているため、組立時に基油吐出隙間11の寸法管理が必要とされる。そのため、前記各実施形態に比べて、基油吐出隙間11の寸法精度、組立性等が若干劣る。   Also in this configuration, as in each of the above embodiments, the grease pool forming component 7 is adjacent to the outer ring 2 having a short width and is arranged in the axial direction, so that the axial dimension of the entire rolling bearing with a grease pool is arranged. Can be shortened. However, unlike the above-described embodiments, the base oil discharge gap 11 is formed by the grease reservoir forming component 7 and the outer ring 2, so that the size management of the base oil discharge gap 11 is required during assembly. Therefore, the dimensional accuracy and assemblability of the base oil discharge gap 11 are slightly inferior to those of the above embodiments.

図5は、図1および図2に示した実施形態のグリース付き転がり軸受を用いた工作機械用スピンドル装置の例を示す。このスピンドル装置では、2個の上記グリース溜まり付き転がり軸受を背面組合せで用いている。2個のグリース溜まり付き転がり軸受30A,30Bは、ハウジング32内で主軸31の両端を回転自在に支持する。各グリース溜まり付き転がり軸受30A,30Bの内輪1は、内輪位置決め間座36および内輪間座37により位置決めされ、内輪固定ナット39により主軸31に締め付け固定されている。外輪2は、グリース溜まり形成部品7の外径側部品分割体14、外輪間座40および外輪押え蓋41,42によりハウジング32内に位置決め固定されている。ハウジング32は、ハウジング内筒32Aとハウジング外筒32Bとを嵌合させたものであり、その嵌合部に冷却のための通油溝43が設けられている。   FIG. 5 shows an example of a spindle device for a machine tool using the greased rolling bearing of the embodiment shown in FIGS. 1 and 2. In this spindle apparatus, the two rolling bearings with the grease reservoir are used in combination with the back surface. Two rolling bearings 30 </ b> A and 30 </ b> B with grease reservoirs rotatably support both ends of the main shaft 31 in the housing 32. The inner ring 1 of each of the rolling bearings 30A and 30B with a grease reservoir is positioned by an inner ring positioning spacer 36 and an inner ring spacer 37, and is fastened and fixed to the main shaft 31 by an inner ring fixing nut 39. The outer ring 2 is positioned and fixed in the housing 32 by the outer diameter side part divided body 14 of the grease reservoir forming part 7, the outer ring spacer 40, and the outer ring holding lids 41 and 42. The housing 32 is formed by fitting a housing inner cylinder 32A and a housing outer cylinder 32B, and an oil passage groove 43 for cooling is provided in the fitting portion.

主軸31は、その前端の端部31aに工具またはワーク(図示せず)を着脱自在に取付けるチャック(図示せず)が設けられ、後ろ側の端部31bは、モータ等の駆動源が回転伝達機構(図示せず)を介して連結される。モータは、ハウジング32に内蔵してもよい。このスピンドル装置は、例えばマニシングモータ、旋盤、フライス盤、研削盤等の各種工作機械に適用できる。   The spindle 31 is provided with a chuck (not shown) for detachably attaching a tool or a work (not shown) to the end 31a of the front end, and a drive source such as a motor transmits rotation to the rear end 31b. They are connected via a mechanism (not shown). The motor may be built in the housing 32. This spindle device can be applied to various machine tools such as a machining motor, a lathe, a milling machine, and a grinding machine.

この構成のスピンドル装置によると、この実施形態のグリース溜まり付き転がり軸受30A,30Bにおける高速化、長寿命化、メンテナンスフリー化の作用が効果的に発揮される。
なお、このスピンドル装置は、図1の実施形態に係るグリース溜まり付き転がり軸受を適用した場合につき説明したが、図3または図4の実施形態に係るグリース溜まり付き転がり軸受、またはそれ以外のこの発明にかかるグリース溜まり付き転がり軸受を用いてもよい。
According to the spindle device of this configuration, the effects of speeding up, extending the life and maintaining maintenance in the rolling bearings 30A and 30B with the grease reservoir of this embodiment are effectively exhibited.
In addition, although this spindle apparatus demonstrated the case where the rolling bearing with a grease pool which concerns on embodiment of FIG. 1 was applied, the rolling bearing with a grease reservoir which concerns on embodiment of FIG. 3 or FIG. 4, or this invention other than that Alternatively, a rolling bearing with a grease reservoir may be used.

また、上記各実施形態のグリース溜まり付き転がり軸受は、転がり軸受6がアンギュラ玉軸受であるが、転がり軸受6は、アンギュラ玉軸受以外の玉軸受であってもよく、場合によってはころ軸受であってもよい。   Further, in the rolling bearings with a grease reservoir of each of the above embodiments, the rolling bearing 6 is an angular ball bearing, but the rolling bearing 6 may be a ball bearing other than the angular ball bearing, and in some cases is a roller bearing. May be.

この発明の実施形態に係るグリース溜まり付き転がり軸受の断面図である。1 is a cross-sectional view of a rolling bearing with a grease reservoir according to an embodiment of the present invention. 同グリース溜まり付き転がり軸受の分解図である。It is an exploded view of the rolling bearing with the grease reservoir. この発明の異なる実施形態に係るグリース溜まり付き転がり軸受の断面図である。It is sectional drawing of the rolling bearing with a grease reservoir which concerns on different embodiment of this invention. この発明のさらに異なる実施形態に係るグリース溜まり付き転がり軸受の断面図である。It is sectional drawing of the rolling bearing with a grease pool which concerns on further different embodiment of this invention. この発明のグリース溜まり付き転がり軸受を備えたスピンドル装置の構成図である。It is a block diagram of the spindle apparatus provided with the rolling bearing with a grease reservoir of this invention. 従来のグリース潤滑機能を備えた転がり軸受の断面図である。It is sectional drawing of the rolling bearing provided with the conventional grease lubrication function.

符号の説明Explanation of symbols

1…内輪(回転側軌道輪)
1a…軌道面
1b…グリース溜まり形成部品に対向する側の端面
2…外輪(固定側軌道輪)
2a…軌道面
2b…グリース溜まり形成部品に対向する側の端面
3…転動体
6…転がり軸受
7…グリース溜まり形成部品
10…グリース溜まり
11…基油吐出隙間
13…内径側部品分割体
14…外径側部品分割体
δ…ギャップ量
1 ... Inner ring (Rotating raceway)
DESCRIPTION OF SYMBOLS 1a ... Raceway surface 1b ... End surface 2 on the side facing grease reservoir forming parts ... Outer ring (fixed side raceway)
2a ... raceway surface 2b ... end face 3 facing the grease reservoir forming part 3 ... rolling element 6 ... rolling bearing 7 ... grease reservoir forming part 10 ... grease reservoir 11 ... base oil discharge gap 13 ... inner diameter side part divided body 14 ... outside Diameter side component division δ ... Gap amount

Claims (7)

内輪、外輪、およびこれら内外輪の軌道面間に介在する複数の転動体を有する転がり軸受と、この転がり軸受に対して、軌道輪である内輪および外輪のうち、回転しない固定側軌道輪に隣接させ軸方向に並べて配置される環状のグリース溜まり形成部品とでなり、
前記固定側軌道輪は、前記グリース溜まり形成部品に対向する側の端面が、この固定側軌道輪の軌道面に続く軸方向位置となる幅寸法とされ、
前記グリース溜まり形成部品は、内部がグリース溜まりとして形成され、前記固定側軌道輪に対向する側の端部に、前記グリース溜まりに続き、前記固定側軌道輪の軌道面の近傍に開口してグリース溜まり内のグリースの基油を吐出する基油吐出隙間を有することを特徴とするグリース溜まり付き転がり軸受。
A rolling bearing having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings, and adjacent to the non-rotating fixed-side bearing ring of the inner ring and outer ring that are the bearing rings with respect to the rolling bearing. An annular grease reservoir forming part arranged side by side in the axial direction,
The fixed-side raceway has a width dimension such that an end surface facing the grease reservoir forming component is an axial position following the raceway surface of the fixed-side raceway,
The grease pool forming component is formed as a grease pool inside, and is opened at the end on the side facing the fixed-side raceway, in the vicinity of the raceway surface of the fixed-side raceway, following the grease pool. A rolling bearing with a grease reservoir, characterized by having a base oil discharge gap for discharging the base oil of grease in the reservoir.
請求項1において、前記基油吐出隙間は、前記グリース溜まり形成部品のみで形成されているグリース溜まり付き転がり軸受。   The rolling bearing with a grease reservoir according to claim 1, wherein the base oil discharge gap is formed only by the grease reservoir forming component. 請求項1または請求項2において、前記固定側軌道輪の前記グリース溜まり形成部品に対向する側の端面と軌道面との接触箇所の軸方向位置は、軌道輪である内輪および外輪のうち、回転する回転側軌道輪の前記グリース溜まり形成部品側の端面と軌道面の中心との間であるグリース溜まり付き転がり軸受。   3. The axial position of the contact portion between the end surface of the fixed-side raceway facing the grease reservoir forming part and the raceway surface is the rotation of the inner ring and the outer ring that are raceways. A rolling bearing with a grease reservoir, which is between the end surface of the rotating raceway ring on the grease reservoir forming component side and the center of the raceway surface. 請求項1ないし請求項3のいずれか1項において、前記基油吐出隙間は、円周方向の全周または一部に設けられ、そのギャップ量は円周方向のどの部分でも均一であるグリース溜まり付き転がり軸受。   4. The grease reservoir according to claim 1, wherein the base oil discharge gap is provided on the entire circumference or a part of the circumference in a circumferential direction, and the gap amount is uniform in any part in the circumference direction. Rolling bearing with. 請求項1ないし請求項4のいずれか1項において、前記グリース溜まり形成部品は、内径側部品分割体と外径側部品分割体とを接合してなり、両部品分割体間に前記基油吐出隙間が形成されたものであり、前記内径側部品分割体および外径側部品分割体のうち、前記固定側軌道輪に接しない部品分割体を樹脂製としたグリース溜まり付き転がり軸受。   5. The grease reservoir forming component according to claim 1, wherein the grease reservoir forming component is formed by joining an inner diameter side component division body and an outer diameter side component division body, and the base oil discharge between both the component division bodies. A rolling bearing with a grease reservoir, in which a gap is formed and a part divided body that is not in contact with the fixed side raceway is made of resin among the inner diameter side part divided body and the outer diameter side part divided body. 請求項1ないし請求項5のいずれか1項において、前記転がり軸受が玉軸受であるグリース溜まり付き転がり軸受装置。   The rolling bearing device with a grease reservoir according to any one of claims 1 to 5, wherein the rolling bearing is a ball bearing. 請求項1ないし請求項6のいずれか1項において、前記固定側軌道輪が外輪であるグリース溜まり付き転がり軸受。   The rolling bearing with a grease reservoir according to any one of claims 1 to 6, wherein the stationary side race is an outer ring.
JP2008056142A 2008-03-06 2008-03-06 Rolling bearing with grease sump Pending JP2009210094A (en)

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