JP2011058520A

JP2011058520A - Rolling bearing device

Info

Publication number: JP2011058520A
Application number: JP2009206615A
Authority: JP
Inventors: Eiji Nishiwaki; 英司西脇
Original assignee: NTN Corp; NTN Toyo Bearing Co Ltd
Current assignee: NTN Corp
Priority date: 2009-09-08
Filing date: 2009-09-08
Publication date: 2011-03-24

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing device, in which base oil of grease enclosed in a grease reservoir forming component is continuously and stably supplied to a raceway surface, without influence of changes with time even when the grease reservoir forming component is molded with resin material. SOLUTION: The rolling bearing device includes an inner ring 1, an outer ring 2, and rolling elements 3. For example, a fixed side bearing ring is the outer ring 2. A spacer 6 is disposed to be adjacent to the outer ring 2. The annular grease reservoir forming component 7 having a grease reservoir 10 formed therein is disposed to an inner periphery of the spacer 6. A projection part 14 of which tip abuts on an stepped surface 2b of the outer ring 2 is disposed to a tip surface of a clearance forming piece 7b of the grease reservoir forming component 7, and a clearance 12 between a portion where there is no projection part 14 and the stepped surface 2b is used as an oil passage guiding the base oil of grease in the grease reservoir 10 to the raceway surface 2a of the outer ring 2. The clearance forming piece 7b and an elastic body 17 are sandwiched between an end surface of the spacer 6 and the stepped surface 2b. COPYRIGHT: (C)2011,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潤滑機構付きの転がり軸受装置に関する。 The present invention relates to a rolling bearing device with a lubrication mechanism for grease lubrication of 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.

このような試みの一つに、例えば特許文献１が挙げられる。特許文献１に記載の転がり軸受は、図１１に示すように、固定側軌道輪２（例えば外輪）の段差面２ｂと隙間１２を介して対向し、内部のグリース溜まり１０と前記隙間１２とが連通した環状のグリース溜まり形成部品７を設け、グリース中の基油を、運転時の温度差により前記隙間１２から固定側軌道輪２の軌道面２ａに供給するようにしたものである。
詳しくは、軸受の停止時には、グリース中の増稠剤および隙間１２の毛細管現象によりグリースの基油が隙間１２に移動し、軸受を運転すると、隙間１２に貯油されていた基油は、運転で生じる固定側軌道輪２の温度変化と、転動体３の公転・自転で生じる空気流とにより隙間１２から吐出される。吐出された基油は、固定側軌道輪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。 One such attempt is, for example, Patent Document 1. As shown in FIG. 11, the rolling bearing described in Patent Document 1 is opposed to the stepped surface 2 b of the stationary race 2 (for example, the outer ring) via a gap 12, and the internal grease reservoir 10 and the gap 12 are separated from each other. An annular grease reservoir forming component 7 is provided, and the base oil in the grease is supplied from the gap 12 to the raceway surface 2a of the fixed-side raceway ring 2 due to a temperature difference during operation.
Specifically, when the bearing is stopped, the base oil of the grease moves to the gap 12 due to the thickener in the grease and the capillary phenomenon of the gap 12, and when the bearing is operated, the base oil stored in the gap 12 is It is discharged from the gap 12 by the temperature change of the fixed-side raceway ring 2 generated and the air flow generated by the revolution and rotation of the rolling element 3. The discharged base oil moves while adhering to the raceway surface 2a of the fixed side raceway ring 2 and is continuously supplied to the rolling element contact portion.

特開２００７−１８２９１７号公報JP 2007-182917 A

この種の潤滑機構付きの転がり軸受では、グリース中の基油を効果的に吐出させて、軸受の潤滑油として安定して供給することが軸受寿命の延長につながる。継続的に安定した量の基油を吐出させるには、隙間１２の隙間量δを適正範囲内に管理することが重要である。例えば、隙間量δは０．０５〜０．１ｍｍが良いとされている。しかし、部品の寸法誤差や組立誤差により、隙間量δを適正に管理するのが難しい。また、グリース溜まり形成部品を樹脂材料で成形する場合、上記部品の寸法誤差や組立誤差の他に、長時間使用することによる経時変化も考慮しなければならない。製品完成当初は隙間量δが適正であっても、経時変化によって隙間量δが適正値から外れ、安定した油の供給ができなくなる可能性があるからである。 In this type of rolling bearing with a lubrication mechanism, the base oil in the grease is effectively discharged and stably supplied as the lubricating oil for the bearing leads to an extension of the bearing life. In order to discharge a stable amount of base oil continuously, it is important to manage the gap amount δ of the gap 12 within an appropriate range. For example, the gap amount δ is preferably 0.05 to 0.1 mm. However, it is difficult to properly manage the gap amount δ due to dimensional errors and assembly errors of parts. In addition, when molding a grease reservoir forming part with a resin material, in addition to the dimensional error and assembly error of the part, it is necessary to take into account changes over time due to long-term use. This is because even if the gap amount δ is appropriate at the beginning of the product, the gap amount δ may deviate from an appropriate value due to changes over time, and stable oil supply may not be possible.

この発明の目的は、軸受内に封入したグリースと軸受に設けたグリース溜まり形成部品内に封入したグリースとを使用して固定側軌道輪の軌道面の潤滑を行え、さらに部品の寸法誤差や組立誤差、ならびにグリース溜まり形成部品の経時変化に影響されずに、グリース溜まり形成部品内に封入したグリースの基油を継続的に安定して軌道面に供給することにより、高速化と長寿命化、メンテナンスフリーを達成できる転がり軸受装置を提供することである。 The object of the present invention is to lubricate the raceway surface of the fixed-side bearing ring by using the grease enclosed in the bearing and the grease encapsulated in the grease reservoir forming part provided in the bearing. High speed and long life are achieved by continuously supplying the base oil of grease sealed in the grease reservoir forming parts to the raceway surface without being affected by errors and aging of the grease reservoir forming parts. A rolling bearing device capable of achieving maintenance-free is provided.

この発明の転がり軸受装置は、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装置において、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、軌道面に続く段差面を転動体から離れる方向に設け、前記固定側軌道輪に対し、前記段差面が向く方向に隣接して間座を設け、この間座の軸受空間側の周面に嵌合して、内部にグリース溜まりが形成された環状のグリース溜まり形成部品を設け、このグリース溜まり形成部品は、前記間座に嵌合する本体部と、この本体部から前記段差面側へ前記固定側軌道輪の軸受空間側の周面に沿って延びて先端面が前記段差面に対向する中空の隙間形成片とを有し、この隙間形成片を構成する内外の環状壁部につき、前記固定側軌道輪の軸受空間側の周面に沿う軌道輪側環状壁部よりもその反対側の非軌道輪側環状壁部の方を前記段差面側に突出させ、この非軌道輪側環状壁部の先端面に、先端が前記段差面に当接する凸部を設け、この先端面の前記凸部が存在しない箇所と前記段差面との間の隙間が、前記グリース溜まりと連通してグリースの基油を前記固定側軌道輪の軌道面へ導く油路となり、かつ前記軌道輪側環状壁部の基端に、前記本体部に対して径方向の段差を有する段面が形成され、この段面と前記間座の端面とが弾性体を介して対向し、前記固定側軌道輪の段差面と前記間座の端面とで前記軌道輪側環状壁部および前記弾性体を弾性体が圧縮された状態で挟み込んだことを特徴とする。例えば、前記固定側軌道輪を外輪とすることができる。 A rolling bearing device according to the present invention is a rolling bearing device having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings. In addition, a stepped surface following the raceway surface is provided in a direction away from the rolling element, and a spacer is provided adjacent to the fixed side raceway in a direction in which the stepped surface faces, and a circumferential surface on the bearing space side of the spacer is provided. An annular grease reservoir forming component having a grease reservoir formed therein is provided, and the grease reservoir forming component includes a main body portion that fits into the spacer, and the main body portion to the stepped surface side. A hollow gap forming piece extending along the bearing space side peripheral surface of the fixed side raceway ring and having a tip surface facing the step surface, and the inner and outer annular wall portions constituting the gap forming piece, On the bearing space side of the fixed ring The non-bearing ring-side annular wall portion on the opposite side of the bearing ring-side annular wall portion along the surface protrudes toward the step surface side, and the tip of the non-bearing ring-side annular wall portion has the tip at the step. Protrusions that contact the surface are provided, and a gap between the portion of the tip surface where the protrusions do not exist and the stepped surface communicates with the grease reservoir, and the base oil of grease is passed through the raceway of the fixed-side raceway. A step surface having a radial step with respect to the main body portion is formed at the base end of the ring-shaped annular wall portion that leads to the surface, and the step surface and the end surface of the spacer are elastic. The bearing ring-side annular wall and the elastic body are sandwiched between the stepped surface of the fixed-side bearing ring and the end face of the spacer while the elastic body is compressed. . For example, the fixed-side raceway can be an outer race.

この構成の転がり軸受装置は、グリース溜まり形成部品のグリース溜まりにグリースを充填して使用される。転がり軸受装置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温度変化が発生し、グリースから分離した基油が隙間を通っ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 device having this configuration is used by filling the grease reservoir of the grease reservoir forming component with grease. A temperature change occurs due to a heat cycle in the grease reservoir accompanying the operation and stop of the rolling bearing device, and the base oil separated from the grease is supplied to the raceway surface of the fixed-side raceway through the gap. As a result, only the grease enclosed in the bearing can be used to achieve high speed, long life, and maintenance-free.

間座の端面と固定側軌道輪の段差面とで隙間形成片の軌道輪側環状壁部および弾性体を挟み込む状態に、グリース溜まり形成部品を組み込む。その際、弾性体が圧縮された状態にする。非軌道輪側環状壁部の方が軌道輪側環状壁部よりも段差面側に突出しているため、非軌道輪側環状壁部の先端面に設けた凸部が段差面に当接する。非軌道輪側環状壁部の先端面における凸部が存在しない箇所と固定側軌道輪の段差面との間に、グリースの基油を前記固定側軌道輪の軌道面へ導く油路となる隙間が形成される。凸部の軸方向長さを目標とする隙間量に設定しておくことで、目標隙間量の隙間が得られる。隙間の隙間量は、凸部の軸方向長さによって決められ、部品の寸法誤差や組立誤差に影響されない。これにより、グリース溜まりに封入したグリースの基油を継続的に安定して固定側軌道輪の軌道面に供給することができる。また、圧縮された状態の弾性体の弾性反発力により、グリース溜まり形成部品が段差面の側に押付けられるため、例えば樹脂材料からなるグリース溜まり形成部品が経時変化しても、凸部の先端が段差面に当接する状態に維持され、常に隙間の隙間量を適正に管理できる。 The grease reservoir forming component is assembled so that the raceway-side annular wall portion of the gap forming piece and the elastic body are sandwiched between the end face of the spacer and the stepped surface of the fixed-side raceway. At that time, the elastic body is compressed. Since the non-ring-ring-side annular wall portion protrudes more toward the step surface than the bearing-ring-side annular wall portion, the convex portion provided on the tip surface of the non-ring-ring-side annular wall portion contacts the step surface. A gap serving as an oil passage for guiding the base oil of grease to the raceway surface of the fixed-side raceway between the portion where the convex portion on the tip surface of the non-race ring-side annular wall portion does not exist and the step surface of the fixed-side raceway Is formed. By setting the axial length of the convex portion to the target gap amount, a target gap amount can be obtained. The gap amount of the gap is determined by the axial length of the convex portion and is not affected by the dimensional error or assembly error of the parts. As a result, the grease base oil sealed in the grease reservoir can be continuously and stably supplied to the raceway surface of the stationary raceway. Further, since the grease pool forming component is pressed against the stepped surface by the elastic repulsive force of the compressed elastic body, for example, even if the grease pool forming component made of a resin material changes with time, the tip of the convex portion It is maintained in contact with the step surface, and the gap amount of the gap can always be properly managed.

グリース溜まり形成部品は独立した一体型の部品であるため、組立前にグリースを密封状態に封入しておくことができる。そのため、組立時におけるグリースまたはその基油の漏れ、およびゴミ等の異物の混入を防げる。また、組立性も良い。 Since the grease reservoir forming part is an independent and integral part, the grease can be sealed in a sealed state before assembly. Therefore, it is possible to prevent leakage of grease or its base oil at the time of assembly and entry of foreign matters such as dust. Also, the assemblability is good.

前記弾性体は、Ｏリングであってもよく、あるいはばねであっても良い。
いずれの場合も、弾性体の弾性反発力により、グリース溜まり形成部品を段差面の側に押付けて、非軌道輪側環状壁部の凸部が固定側軌道輪の段差面に当接する状態を維持できる。 The elastic body may be an O-ring or a spring.
In either case, the elastic repulsive force of the elastic body presses the grease pool forming component against the step surface, maintaining the state where the convex part of the annular wall on the non-ring ring side abuts on the step surface of the stationary ring. it can.

この発明において、前記軌道輪側環状壁部の段面に前記弾性体が嵌る弾性体用凹部を設け、この弾性体用凹部の底面と前記間座の端面との間に前記弾性体を介在させるのが良い。この場合、弾性体用凹部の底面は、軌道輪側環状壁部の段面の一部である。また、前記間座の端面に前記弾性体が嵌る弾性体用凹部を設け、この弾性体用凹部の底面と前記軌道輪側環状壁部の段面との間に前記弾性体を介在させても良い。この場合、弾性体用凹部の底面は、間座の端面の一部である。弾性体がＯリングである場合、弾性体用凹部は環状溝の形態になる。
軌道輪側環状壁部の段面または間座の端面に弾性体用凹部が設けられていれば、この弾性体用凹部に予め弾性体を嵌めておくことにより、組立作業時における弾性体の脱落および他の部品への挟み込みを防止することができ、グリース溜まり形成部品および間座の組込み作業性が向上する。 In this invention, the concave part for elastic bodies which the said elastic body fits in the step surface of the said track ring side annular wall part is provided, and the said elastic body is interposed between the bottom face of this concave part for elastic bodies, and the end surface of the said spacer. Is good. In this case, the bottom surface of the elastic body concave portion is a part of the step surface of the race-ring-side annular wall portion. Also, an elastic body recess for fitting the elastic body may be provided on the end surface of the spacer, and the elastic body may be interposed between the bottom surface of the elastic body recess and the step surface of the raceway ring-side annular wall. good. In this case, the bottom surface of the elastic body recess is a part of the end face of the spacer. When the elastic body is an O-ring, the elastic body recess is in the form of an annular groove.
If a recess for elastic body is provided on the step surface of the ring-shaped ring-side annular wall or the end face of the spacer, the elastic body is dropped in the assembly operation by fitting the elastic body in advance to the recess for elastic body. In addition, it is possible to prevent pinching in other parts, and the workability of assembling the grease reservoir forming part and the spacer is improved.

この発明において、前記隙間形成片の軌道輪側環状壁部が前記固定側軌道輪の軸受空間側の周面に嵌合する場合、前記軌道輪側環状壁部における固定側軌道輪側の周面の中間部に環状の溝を設け、この溝に弾性体からなる油漏れ防止体を嵌め込んで設けるのが良い。または、前記隙間形成片の軌道輪側環状壁部が前記固定側軌道輪の軸受空間側の周面に嵌合し、前記固定側軌道輪の軸受空間側の周面の中間部に環状の溝を設け、この溝に弾性体からなる油漏れ防止体を嵌め込んで設けても良い。
軌道輪側環状壁部が固定側軌道輪の軸受空間側の周面に嵌合する場合、組立性を良くするために、軌道輪側環状壁部と固定側軌道輪とをルーズフィットで嵌合させることがある。その場合、両者の接触部から基油が軸受外に漏れる可能性がある。上記のように油漏れ防止体を設けることで、軌道輪側環状壁部と固定側軌道輪の接触部から基油が漏れるのを防げる。 In this invention, when the bearing ring side annular wall portion of the gap forming piece is fitted to the bearing space side peripheral surface of the fixed side race ring, the fixed side race ring side peripheral surface of the race ring side annular wall portion It is preferable to provide an annular groove in the middle portion of this, and to insert an oil leakage prevention body made of an elastic body into this groove. Or, the ring-shaped ring-side annular wall portion of the gap forming piece is fitted into the bearing space-side peripheral surface of the fixed-side track ring, and an annular groove is formed in the intermediate portion of the bearing-space-side peripheral surface of the fixed-side track ring And an oil leakage prevention body made of an elastic body may be fitted into the groove.
When the race ring side annular wall is fitted to the bearing space side peripheral surface of the fixed side race ring, the race ring side annular wall and the fixed side race ring are loosely fitted to improve assembly. There are things to do. In that case, the base oil may leak out of the bearing from the contact portion between the two. By providing the oil leakage prevention body as described above, it is possible to prevent the base oil from leaking from the contact portion between the race ring side annular wall portion and the fixed side race ring.

この発明において、前記グリース溜まり形成部品本体部の前記間座に対する嵌合面に、前記間座の軸受空間側の周面に前記グリース溜まり形成部品本体部が嵌合した状態で、グリース溜まり形成部品本体部に対して間座が抜けるのを防ぐ抜け止めを設けても良い。
抜け止めが設けられていれば、グリース溜まり形成部品と間座とを一体化して取り扱うことができ、組立時の取扱性が良い。 In this invention, in the state where the grease reservoir forming component main body is fitted to the peripheral surface of the spacer on the bearing space side with the fitting surface of the grease reservoir forming component main body with respect to the spacer, the grease reservoir forming component A stopper that prevents the spacer from coming off from the main body may be provided.
If the stopper is provided, the grease reservoir forming component and the spacer can be handled in an integrated manner, and the handleability during assembly is good.

この発明の転がり軸受装置は、上記作用効果が得られるため、工作機械主軸の支持に好適に用いることができる。 The rolling bearing device according to the present invention can be suitably used for supporting the machine tool spindle because the above-described effects can be obtained.

この発明の転がり軸受装置は、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装置において、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、軌道面に続く段差面を転動体から離れる方向に設け、前記固定側軌道輪に対し、前記段差面が向く方向に隣接して間座を設け、この間座の軸受空間側の周面に嵌合して、内部にグリース溜まりが形成された環状のグリース溜まり形成部品を設け、このグリース溜まり形成部品は、前記間座に嵌合する本体部と、この本体部から前記段差面側へ前記固定側軌道輪の軸受空間側の周面に沿って延びて先端面が前記段差面に対向する中空の隙間形成片とを有し、この隙間形成片を構成する内外の環状壁部につき、前記固定側軌道輪の軸受空間側の周面に沿う軌道輪側環状壁部よりもその反対側の非軌道輪側環状壁部の方を前記段差面側に突出させ、この非軌道輪側環状壁部の先端面に、先端が前記段差面に当接する凸部を設け、この先端面の前記凸部が存在しない箇所と前記段差面との間の隙間が、前記グリース溜まりと連通してグリースの基油を前記固定側軌道輪の軌道面へ導く油路となり、かつ前記軌道輪側環状壁部の基端に、前記本体部に対して径方向の段差を有する段面が形成され、この段面と前記間座の端面とが弾性体を介して対向し、前記固定側軌道輪の段差面と前記間座の端面とで前記軌道輪側環状壁部および前記弾性体を弾性体が圧縮された状態で挟み込んだため、軸受内に封入したグリースと軸受に設けたグリース溜まり形成部品内に封入したグリースとを使用して固定側軌道輪の軌道面の潤滑を行え、さらに部品の寸法誤差や組立誤差、ならびにグリース溜まり形成部品の経時変化に影響されずに、グリース溜まり形成部品内に封入したグリースの基油を継続的に安定して軌道面に供給することにより、高速化と長寿命化、メンテナンスフリーを達成できる。 A rolling bearing device according to the present invention is a rolling bearing device having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings. In addition, a stepped surface following the raceway surface is provided in a direction away from the rolling element, and a spacer is provided adjacent to the fixed side raceway in a direction in which the stepped surface faces, and a circumferential surface on the bearing space side of the spacer is provided. An annular grease reservoir forming component having a grease reservoir formed therein is provided, and the grease reservoir forming component includes a main body portion that fits into the spacer, and the main body portion to the stepped surface side. A hollow gap forming piece extending along the bearing space side peripheral surface of the fixed side raceway ring and having a tip surface facing the step surface, and the inner and outer annular wall portions constituting the gap forming piece, On the bearing space side of the fixed ring The non-bearing ring-side annular wall portion on the opposite side of the bearing ring-side annular wall portion along the surface protrudes toward the step surface side, and the tip of the non-bearing ring-side annular wall portion has the tip at the step. Protrusions that contact the surface are provided, and a gap between the portion of the tip surface where the protrusions do not exist and the stepped surface communicates with the grease reservoir, and the base oil of grease is passed through the raceway of the fixed-side raceway. A step surface having a radial step with respect to the main body portion is formed at the base end of the ring-shaped annular wall portion that leads to the surface, and the step surface and the end surface of the spacer are elastic. The bearing ring-side annular wall portion and the elastic body are sandwiched in a state where the elastic body is compressed between the stepped surface of the fixed-side bearing ring and the end surface of the spacer, so that the elastic body is compressed. Using the sealed grease and the grease sealed in the grease reservoir forming part provided on the bearing Lubricating the raceway surface of the fixed-side raceway, and continuously using the grease base oil enclosed in the grease reservoir forming parts without being affected by the dimensional and assembly errors of the parts and the aging of the grease reservoir forming parts By supplying to the raceway surface stably, high speed, long life and maintenance-free can be achieved.

（Ａ）はこの発明の実施形態に転がり軸受装置の断面図、（Ｂ）はその部分拡大図である。(A) is sectional drawing of a rolling bearing apparatus in embodiment of this invention, (B) is the elements on larger scale. 同転がり軸受装置のグリース溜まり形成部品の側面図である。It is a side view of the grease pool formation component of the rolling bearing device. （Ａ）はこの発明の異なる実施形態にかかる転がり軸受装置の断面図、（Ｂ）はその部分拡大図である。(A) is sectional drawing of the rolling bearing apparatus concerning different embodiment of this invention, (B) is the elements on larger scale. （Ａ）はこの発明のさらに異なる実施形態にかかる転がり軸受装置の断面図、（Ｂ）はその部分拡大図である。(A) is sectional drawing of the rolling bearing apparatus concerning further different embodiment of this invention, (B) is the elements on larger scale. （Ａ）はこの発明のさらに異なる実施形態にかかる転がり軸受装置の断面図、（Ｂ）はその部分拡大図である。(A) is sectional drawing of the rolling bearing apparatus concerning further different embodiment of this invention, (B) is the elements on larger scale. （Ａ）はこの発明のさらに異なる実施形態にかかる転がり軸受装置の断面図、（Ｂ）はその部分拡大図である。(A) is sectional drawing of the rolling bearing apparatus concerning further different embodiment of this invention, (B) is the elements on larger scale. この発明のさらに異なる実施形態にかかる転がり軸受装置の断面図である。It is sectional drawing of the rolling bearing apparatus concerning further different embodiment of this invention. この発明のさらに異なる実施形態にかかる転がり軸受装置の断面図である。It is sectional drawing of the rolling bearing apparatus concerning further different embodiment of this invention. この発明のさらに異なる実施形態にかかる転がり軸受装置の断面図である。It is sectional drawing of the rolling bearing apparatus concerning further different embodiment of this invention. 図１および図２に示す転がり軸受装置を備えた主軸装置の断面図である。FIG. 3 is a cross-sectional view of a main shaft device including the rolling bearing device shown in FIGS. 1 and 2. 従来の転がり軸受装置の断面図である。It is sectional drawing of the conventional rolling bearing apparatus.

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において、この転がり軸受装置は、内輪１、外輪２、および内外輪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Ａと、外輪位置決め間座６と、グリース溜まり形成部品７とを備える。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Ａはアンギュラ玉軸受であり、外輪位置決め間座６および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、軸受正面側からのグリースの漏れが防止される。図１（Ａ）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は主軸装置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. In FIG. 1, this rolling bearing device includes a rolling bearing A having a plurality of rolling elements 3 interposed between raceways 1 a and 2 a of an inner ring 1, an outer ring 2, and inner and outer rings 1 and 2, and an outer ring positioning spacer 6. And a grease reservoir forming component 7. 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 A is an angular ball bearing, the outer ring positioning spacer 6 and the grease reservoir forming component 7 are provided on the front side of the bearing, and the seal 5 is provided on the end on the back side of the bearing. The grease reservoir forming component 7 also serves as a seal on the front side of the bearing, so that leakage of grease from the front side of the bearing is prevented. In FIG. 1A, a portion indicated by crossed hatching indicates a portion filled with grease. The inner ring 1 is fitted to a main shaft (not shown) so as 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 main shaft device.

固定側軌道輪となる外輪２には、その軌道面２ａに続く段差面２ｂが、転動体３から離れる外輪正面側、つまり軌道面２ａにおける接触角が生じる方向と反対側の縁部に続いて設けられている。この段差面２ｂは、軌道面２ａから外径側に延びて外輪正面側に対面する面である。段差面２ｂから外輪正面側に続く内周面部分２ｃは、円筒状の面とされている。
内輪１の正面側の肩部１ｂは、後記グリース溜まり形成部品７の本体部７ａとの干渉を避けるために、内外輪１，２の正面側端面よりも後退した形状としてある。 On the outer ring 2 serving as a fixed-side raceway, a step surface 2b following the raceway surface 2a follows the outer ring front side away from the rolling elements 3, that is, the edge on the opposite side to the direction in which the contact angle occurs on the raceway surface 2a. Is provided. The step surface 2b is a surface that extends from the raceway surface 2a to the outer diameter side and faces the outer ring front side. An inner peripheral surface portion 2c continuing from the step surface 2b to the outer ring front side is a cylindrical surface.
The shoulder 1b on the front side of the inner ring 1 is shaped to recede from the front side end surfaces of the inner and outer rings 1 and 2 in order to avoid interference with the body part 7a of the grease pool forming component 7 described later.

外輪位置決め間座６は、外輪２の正面側の端面２ｄに接して設けられる。外輪２および外輪位置決め間座６の合わせ面となるそれぞれの端面２ｄ，６ａは、外径縁では両者共に同径で、内径縁では外輪２よりも外輪位置決め間座６の方が小径である。なお、内輪１の正面側には、端面に接して内輪位置決め間座８が設けられている。 The outer ring positioning spacer 6 is provided in contact with the front end face 2 d of the outer ring 2. The end surfaces 2d and 6a that are the mating surfaces of the outer ring 2 and the outer ring positioning spacer 6 are both the same diameter at the outer diameter edge, and the outer ring positioning spacer 6 is smaller in diameter than the outer ring 2 at the inner diameter edge. An inner ring positioning spacer 8 is provided on the front side of the inner ring 1 in contact with the end face.

グリース溜まり形成部品７は環状の部品であり、内部にグリース溜まり１０が形成された本体部７ａと、この本体部７ａから前記段差面２ｂ側へ延び、内部に前記グリース溜まり１０に連通する流路１１が形成された中空の隙間形成片７ｂとでなる。流路１１は、その先端部が径方向幅の最も小さい最小幅部１１ａになっている。本体部７ａは外輪位置決め間座６の内周に嵌合し、隙間形成片７ｂは外輪２の前記内周面部分２ｃに嵌合している。グリース溜まり形成部品７は、例えば樹脂材料からなる一体物である。グリース溜まり形成部品７を樹脂材料で成形すると、加工が容易で、安価に提供することもできる。グリース溜まり形成部品７は、内径側の部材と外径側の部材を接合した構成としてもよい。 The grease reservoir forming component 7 is an annular component, and a main body portion 7a having a grease reservoir 10 formed therein, and a flow path extending from the main body portion 7a toward the stepped surface 2b and communicating with the grease reservoir 10 therein. 11 is formed with a hollow gap forming piece 7b. The front end of the channel 11 is the smallest width portion 11a having the smallest radial width. The main body portion 7 a is fitted to the inner circumference of the outer ring positioning spacer 6, and the gap forming piece 7 b is fitted to the inner circumferential surface portion 2 c of the outer ring 2. The grease reservoir forming component 7 is an integral body made of, for example, a resin material. If the grease reservoir forming component 7 is formed of a resin material, it can be easily processed and provided at a low cost. The grease reservoir forming component 7 may have a configuration in which a member on the inner diameter side and a member on the outer diameter side are joined.

グリース溜まり形成部品７の外周面９は、外輪２の内周面部分２ｃに嵌合する軌道輪嵌合面９ａと、外輪位置決め間座６の内周面に嵌合する間座嵌合面９ｂと、これら軌道輪嵌合面９ａと間座嵌合面９ｂとの境界に形成された段面９ｃとでなる。軌道輪嵌合面９ａは隙間形成片７ｂの外周面に相当し、間座嵌合面９ｂは本体部７ａの外周面に相当する。段面９ｃは、隙間形成片７ｂを構成する内外の環状壁部７ｂａ，７ｂｂのうちの軌道輪側環状壁部７ｂｂの基端に形成され、前記本体部７ａに対して外径方向の段差を有する面である。 The outer peripheral surface 9 of the grease reservoir forming component 7 includes a race ring fitting surface 9a that fits to the inner peripheral surface portion 2c of the outer ring 2 and a spacer fitting surface 9b that fits to the inner peripheral surface of the outer ring positioning spacer 6. And a step surface 9c formed at the boundary between the bearing ring fitting surface 9a and the spacer fitting surface 9b. The bearing ring fitting surface 9a corresponds to the outer peripheral surface of the gap forming piece 7b, and the spacer fitting surface 9b corresponds to the outer peripheral surface of the main body portion 7a. The step surface 9c is formed at the base end of the race ring-side annular wall portion 7bb of the inner and outer annular wall portions 7ba, 7bb constituting the gap forming piece 7b, and has a step in the outer diameter direction with respect to the main body portion 7a. It is a surface that has.

組立状態では、グリース溜まり形成部品７の軌道輪嵌合面９ａの正面側端は外輪２の内周面部分２ｃの正面側端よりも背面側に位置しており、グリース溜まり形成部品７の段面９ｃが、外輪位置決め間座６の端面６ａと、環状空間１５を挟んで対向する。この環状空間１５には弾性体１６が嵌め込まれている。この例では、弾性体１６はＯリングである。Ｏリングからなる弾性体１６は、グリース溜まり形成部品７の段面９ｃと外輪位置決め間座６の端面６ａとに挟まれて押し潰された状態になっている。つまり、圧縮された状態になっている。外輪位置決め間座６の端面６ａが弾性体１６を介してグリース溜まり形成部品７の段面９ｃに間接的に当接することにより、グリース溜まり形成部品７の軸方向位置が位置決めされる。言い換えると、外輪位置決め間座６の端面６ａと外輪２の段差面２ｂとで、隙間形成片７ｂおよび弾性体１６を挟み込んだ状態になる。この組立状態では、外輪２の段差面２ｂと隙間形成片７ｂの先端面１３との間に、油吐出用の隙間１２が形成される。この隙間１２に面して、前記流路１１の最小幅部１１ａが開口している。 In the assembled state, the front side end of the bearing ring fitting surface 9 a of the grease pool forming component 7 is located on the back side of the front side end of the inner peripheral surface portion 2 c of the outer ring 2. The surface 9c faces the end surface 6a of the outer ring positioning spacer 6 with the annular space 15 interposed therebetween. An elastic body 16 is fitted in the annular space 15. In this example, the elastic body 16 is an O-ring. The elastic body 16 made of an O-ring is sandwiched between the step surface 9 c of the grease reservoir forming component 7 and the end surface 6 a of the outer ring positioning spacer 6 and is crushed. That is, it is in a compressed state. The end surface 6a of the outer ring positioning spacer 6 indirectly contacts the step surface 9c of the grease reservoir forming component 7 via the elastic body 16, whereby the axial position of the grease reservoir forming component 7 is positioned. In other words, the gap forming piece 7b and the elastic body 16 are sandwiched between the end surface 6a of the outer ring positioning spacer 6 and the step surface 2b of the outer ring 2. In this assembled state, an oil discharge gap 12 is formed between the step surface 2b of the outer ring 2 and the tip surface 13 of the gap forming piece 7b. Facing the gap 12, the minimum width portion 11a of the flow path 11 is opened.

隙間形成片７ｂを構成する内外の環状壁部７ｂａ，７ｂｂを比較して、非軌道輪側環状壁部７ｂａの方が軌道輪側環状壁部７ｂｂよりも、先端を段差面２ｂ側へ突出させてある。言い換えると、隙間形成片７ｂの先端面１３のうち、非軌道輪側環状壁部７ｂａの先端面１３ａの方が軌道輪側環状壁部７ｂｂの先端面１３ｂよりも、段差面２ｂに接近している。そして、非軌道輪側環状壁部７ｂａの先端面１３ａの周方向複数箇所（図２）に、組立状態において先端が段差面２ｂに当接した凸部１４が設けられている。つまり、先端面１３ａの凸部１４が存在しない箇所と段差面２ｂとの間が、実質上の前記油吐出用隙間１２になっている。凸部１４の突出量は、隙間１２の隙間量δが例えば０．０５〜０．１ｍｍになるように設定されている。 Comparing the inner and outer annular wall portions 7ba, 7bb constituting the gap forming piece 7b, the tip end of the non-race ring side annular wall portion 7ba is protruded toward the step surface 2b side than the race ring side annular wall portion 7bb. It is. In other words, of the front end surface 13 of the gap forming piece 7b, the front end surface 13a of the non-race ring side annular wall portion 7ba is closer to the step surface 2b than the front end surface 13b of the race ring side annular wall portion 7bb. Yes. And the convex part 14 which the front-end | tip contact | abutted the level | step difference surface 2b in the assembly state is provided in the circumferential direction several places (FIG. 2) of the front end surface 13a of the non-race ring side annular wall part 7ba. In other words, the oil discharge gap 12 is substantially between the portion where the convex portion 14 of the tip surface 13a does not exist and the step surface 2b. The protrusion amount of the convex portion 14 is set so that the gap amount δ of the gap 12 is, for example, 0.05 to 0.1 mm.

この転がり軸受装置の組立に際し、グリース溜まり形成部品７の軌道輪嵌合面９ａを外輪２の内周面部分２ｃに嵌合させ、かつグリース溜まり形成部品７の間座嵌合面９ｂに外輪位置決め間座６を嵌合させる。その際、グリース溜まり形成部品７の段面９ｃと外輪位置決め間座６の端面６ａとの間に弾性体１６を介在させて、間座６の端面６ａと外輪２の段差面２ｂとで隙間形成片７ｂおよび弾性体１６を挟み込む。この組立状態では、隙間形成片７ｂの凸部１４が外輪２の段差面２ｂに当接し、隙間形成片７ｂの対向面１３と外輪２の段差面２ｂとの間に所定の隙間量δの隙間１２が形成される。圧縮された状態の弾性体１６の弾性反発力により、グリース溜まり形成部品７が段差面２ｂの側に押付けられるため、樹脂材料からなるグリース溜まり形成部品７が経時変化しても、凸部１４が段差面２ｂに当接する状態に維持され、常に隙間１２の隙間量δを適正に管理できる。 When the rolling bearing device is assembled, the raceway fitting surface 9a of the grease pool forming component 7 is fitted to the inner peripheral surface portion 2c of the outer ring 2, and the outer ring positioning is positioned on the spacer fitting surface 9b of the grease pool forming component 7. The spacer 6 is fitted. At that time, an elastic body 16 is interposed between the step surface 9c of the grease reservoir forming component 7 and the end surface 6a of the outer ring positioning spacer 6 so that a gap is formed between the end surface 6a of the spacer 6 and the step surface 2b of the outer ring 2. The piece 7b and the elastic body 16 are sandwiched. In this assembled state, the convex portion 14 of the gap forming piece 7b contacts the step surface 2b of the outer ring 2, and a gap of a predetermined gap amount δ is formed between the facing surface 13 of the gap forming piece 7b and the step surface 2b of the outer ring 2. 12 is formed. The grease pool forming component 7 is pressed against the stepped surface 2b by the elastic repulsive force of the elastic body 16 in a compressed state. Therefore, even if the grease pool forming component 7 made of a resin material changes with time, the convex portion 14 is formed. It is maintained in contact with the stepped surface 2b, and the gap amount δ of the gap 12 can always be properly managed.

グリース溜まり形成部品７は独立した一体型の部品であるため、組立前にグリースを密封状態に封入しておくことができる。そのため、組立時におけるグリースまたはその基油の漏れ、およびゴミ等の異物の混入を防げる。また、組立性も良い。 Since the grease reservoir forming part 7 is an independent and integral part, the grease can be sealed in a sealed state before assembly. Therefore, it is possible to prevent leakage of grease or its base oil at the time of assembly and entry of foreign matters such as dust. Also, the assemblability is good.

この転がり軸受装置の作用を説明する。軸受内には、初期潤滑用としてグリースを封入しておく。軸受を回転すると、運転時の起動、停止により軸受に温度変化が発生し、グリース溜まり１０内のグリースから基油が分離する。同時に、密閉状態にあるグリース溜まり１０の内部の温度が上昇する。この温度上昇により、分離した基油が流路１１を通って隙間１２から軸受空間に吐出される。吐出された基油は、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、基油の吐出と並行して内部温度が徐々に下がり、単位時間当たりの基油吐出量も減少していく。その後、運転が停止されると、グリース溜まり１０の温度も下降する。このとき、温度上昇による基油の吐出は無く、隙間１２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の温度変化が再度発生する。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内での温度変動が繰り返され、グリースから分離した基油が確実に隙間１２から吐出され、外輪２の軌道面２ａに繰り返し供給される。 The operation of this rolling bearing device will be described. Grease is sealed in the bearing for initial lubrication. When the bearing is rotated, a temperature change occurs in the bearing due to starting and stopping during operation, and the base oil is separated from the grease in the grease reservoir 10. At the same time, the temperature inside the grease reservoir 10 in a sealed state increases. Due to this temperature rise, the separated base oil is discharged from the gap 12 to the bearing space through the flow path 11. The discharged base oil is supplied to the raceway surface 2 a of the outer ring 2. When the temperature rises to a steady state, the internal temperature 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. At this time, there is no discharge of the base oil due to the temperature rise, and the gap 12 is filled with the base oil. Therefore, the grease reservoir 10 is in a sealed state in the operation stop state.
Thereafter, when the operation is resumed, the temperature change of the grease reservoir 10 occurs again. By such a heat cycle of temperature rise and fall, temperature fluctuations in the grease reservoir 10 are repeated, and the base oil separated from the grease is reliably discharged from the gap 12 and repeatedly supplied to the raceway surface 2a of the outer ring 2. .

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前記隙間１２の毛細管現象により、グリースの基油が流路１１から隙間１２に移動し、この毛細管現象と油の表面張力とが相まって隙間１２に基油が油状で保持される。軸受を運転すると、隙間１２に貯油されていた基油は、運転で生じる外輪２の温度上昇と、転動体３の公転・自転で生じる空気流とにより隙間１２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 grease base oil moves from the flow path 11 to the gap 12 due to the thickener in the grease and the capillary phenomenon of the gap 12, and the capillary phenomenon and the surface tension of the oil combine to form the gap 12. The base oil is kept oily. When the bearing is operated, the base oil stored in the clearance 12 flows out of the clearance 12 due to the temperature rise of the outer ring 2 generated by the operation and the air flow generated by the revolution and rotation of the rolling element 3, and the race of the outer ring 2. It moves while adhering to the surface 2a and is continuously supplied to the rolling element contact portion.

このように、この転がり軸受装置では、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温度変動で、グリースから分離した基油が隙間１２を経て外輪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、隙間１２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 device, the base oil separated from the grease is supplied to the raceway surface 2a of the outer ring 2 through the gap 12 due to the temperature fluctuation due to the heat cycle in the grease reservoir 10 due to the repeated operation stop and operation restart. Therefore, 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 gap 12, the 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.

この実施形態では、固定側軌道輪が外輪２であり、この外輪２に前記段差面２ｂが設けられるが、グリース封入状態で軸受を回転させたときに、封入グリースが遠心力で外輪内径部に飛散するため、前記隙間１２と軌道面２ａとの間の基油の繋がりが確実となる。そのため、転動体接触部で潤滑油として消費される分の基油が、グリース溜まり１０から隙間１２を経て軌道面２ａに補給される作用が高められ、より安定した潤滑油の補給が行われる。 In this embodiment, the fixed-side raceway is the outer ring 2, and the stepped surface 2b is provided on the outer ring 2, but when the bearing is rotated in a grease-filled state, the sealed grease is applied to the inner diameter of the outer ring by centrifugal force. Because of the scattering, the base oil is reliably connected between the gap 12 and the raceway surface 2a. As a result, the base oil that is consumed as the lubricating oil in the rolling element contact portion is replenished to the raceway surface 2a from the grease reservoir 10 via the gap 12, and the lubricating oil is more stably replenished.

また、この実施形態では、転がり軸受がアンギュラ玉軸受であり、前記段差面２ｂが、軌道面２ａにおける接触角が生じる方向とは反対側の縁部に続いて形成されているので、段差面２ｂをより転動体３の直下に配置し易くなる。これにより、転動体３の中心付近に段差面２ｂを近づけることができ、隙間１２から軌道面２ａへの潤滑油の補給がより効率良く行える。 In this embodiment, the rolling bearing is an angular ball bearing, and the stepped surface 2b is formed following the edge on the side opposite to the direction in which the contact angle occurs on the raceway surface 2a. Can be more easily disposed immediately below the rolling elements 3. Thereby, the level | step difference surface 2b can be closely approached to the center vicinity of the rolling element 3, and the replenishment of the lubricating oil from the clearance gap 12 to the track surface 2a can be performed more efficiently.

図３はこの発明の異なる実施形態を示す。この実施形態が前記実施形態と異なる点は、外輪位置決め間座６の背面側の端面６ａが、外輪２との合わせ面となる外径側端面６ａａと、グリース溜まり形成部品７の段面９ｃと対向する内径側端面６ａｂとでなり、外径側端面６ａａよりも内径側端面６ａｂの方が背面側に後退した形状とされている。グリース溜まり形成部品７の軌道輪嵌合面９ａは、外輪２の内周面部分２ｃよりも背面側に延びており、その背面側に続く段面９ｃが外輪位置決め間座６の前記内径側端面６ａｂと対向している。段面９ｃには環状溝からなる弾性体用凹部１７が設けられ、この弾性体用凹部１７にＯリング等の弾性体１６が嵌め込まれている。弾性体用凹部１７の底面は段面９ｃの一部であり、この弾性体用凹部１７の底面と外輪位置決め間座６の端面６ａとの間に弾性体１６が介在する。他は前記実施形態と同じであり、同じ構成の箇所は同一符号を付してある。 FIG. 3 shows a different embodiment of the invention. This embodiment is different from the above-described embodiment in that an end surface 6a on the back side of the outer ring positioning spacer 6 is an outer diameter side end surface 6aa to be a mating surface with the outer ring 2, and a step surface 9c of the grease reservoir forming component 7. The inner diameter side end face 6ab is opposed to the outer diameter side end face 6aa, and the inner diameter side end face 6ab is recessed toward the back side. The bearing ring fitting surface 9 a of the grease pool forming component 7 extends to the back side from the inner peripheral surface portion 2 c of the outer ring 2, and the step surface 9 c following the back side is the inner diameter side end surface of the outer ring positioning spacer 6. It faces 6ab. The step surface 9 c is provided with an elastic body recess 17 formed of an annular groove, and an elastic body 16 such as an O-ring is fitted in the elastic body recess 17. The bottom surface of the elastic body recess portion 17 is a part of the step surface 9 c, and the elastic body 16 is interposed between the bottom surface of the elastic body recess portion 17 and the end surface 6 a of the outer ring positioning spacer 6. Others are the same as those of the above-described embodiment, and the same reference numerals are given to portions having the same configuration.

この構成によれば、組立時に、弾性体用凹部１７に予め弾性体１６を嵌めておくことにより、弾性体１６の脱落および他の部品への挟み込みを防止することができ、グリース溜まり形成部品７および外輪位置決め間座６の組込み作業性が向上する。段面９ｃに弾性体用凹部１７を設けることで、グリース溜まり形成部品７における弾性体凹部１７の周辺部の肉厚が部分的に薄くなる場合は、外輪位置決め間座６の内径側端面６ａｂにも弾性体凹部１７に対応する弾性体凹部（図示せず）を設けることで、グリース溜まり形成部品７の弾性体凹部１７の溝深さを浅くして、必要な肉厚を確保するのが良い。 According to this configuration, by fitting the elastic body 16 in advance into the elastic body recess 17 during assembly, the elastic body 16 can be prevented from falling off and being caught in other parts, and the grease pool forming part 7 can be prevented. And the workability of assembling the outer ring positioning spacer 6 is improved. If the thickness of the peripheral portion of the elastic recess 17 in the grease reservoir forming component 7 is partially reduced by providing the recess 17 for the elastic body on the stepped surface 9c, the inner end face 6ab of the outer ring positioning spacer 6 is In addition, by providing an elastic concave portion (not shown) corresponding to the elastic concave portion 17, the groove depth of the elastic concave portion 17 of the grease reservoir forming component 7 should be reduced to ensure the necessary thickness. .

グリース溜まり形成部品７の段面９ｃに弾性体用凹部１７を設ける代わりに、図４に示すように、外輪位置決め間座６の内径側端面６ａｂに弾性体用凹部１７を設けてもよい。弾性体用凹部１７の底面は内径側端面６ａｂの一部であり、この弾性体用凹部１７の底面とグリース溜まり形成部品７の段面９ｃとの間に弾性体１６が介在する。この場合も、同様の作用効果が得られる。 Instead of providing the elastic concave portion 17 on the step surface 9c of the grease reservoir forming component 7, as shown in FIG. 4, the elastic concave portion 17 may be provided on the inner diameter side end surface 6ab of the outer ring positioning spacer 6. The bottom surface of the elastic body recess portion 17 is a part of the inner diameter side end surface 6ab, and the elastic body 16 is interposed between the bottom surface of the elastic body recess portion 17 and the step surface 9c of the grease reservoir forming component 7. In this case, the same effect can be obtained.

また、図５および図６に示すように、弾性体１６がばねであっても良い。ばねからなる弾性体１６は、円周方向の複数箇所に等間隔で配置される。図５の実施形態では、グリース溜まり形成部品７の段面９ｃに設けた弾性体用凹部１７に弾性体１６が嵌め込まれ、図６の実施形態では、外輪位置決め間座６の内径側端面６ａｂに設けた弾性体用凹部１７に弾性体１６が嵌め込まれている。弾性体１６がばねである場合、弾性体１６が円周方向に位置ずれしないように、弾性体用凹部１７は円周方向に部分的に設けられた軸方向孔とするのが良い。 5 and 6, the elastic body 16 may be a spring. The elastic bodies 16 made of springs are arranged at equal intervals at a plurality of locations in the circumferential direction. In the embodiment of FIG. 5, the elastic body 16 is fitted into the elastic body recess 17 provided on the step surface 9 c of the grease reservoir forming component 7. In the embodiment of FIG. 6, the inner ring side end face 6 ab of the outer ring positioning spacer 6 is formed. The elastic body 16 is fitted into the provided recess 17 for elastic body. When the elastic body 16 is a spring, the elastic body recess 17 may be an axial hole partially provided in the circumferential direction so that the elastic body 16 is not displaced in the circumferential direction.

図７はさらに異なる実施形態を示す。この転がり軸受装置は、グリース溜まり形成部品７の軌道輪側環状壁部７ｂｂにおける固定側軌道輪６側の周面である軌道輪嵌合面９ａの中間部に環状の溝１８を設け、この溝１８にＯリング等の弾性体からなる油漏れ防止体１９を嵌め込んである。溝１８と弾性体１６を嵌め込む環状空間１５とが接近しすぎるのを避けるために、図１および図２に示す実施形態と比べて、軌道輪嵌合面９ａの背面側端を外輪２の内周面部分２ｃよりも背面側に延ばしてある。他は図１および図２に示す実施形態と同じであり、同じ構成の箇所は同一符号を付してある。 FIG. 7 shows a further different embodiment. This rolling bearing device is provided with an annular groove 18 in an intermediate portion of a bearing ring fitting surface 9a which is a peripheral surface of the bearing ring side annular wall portion 7bb of the grease pool forming component 7 on the fixed side bearing ring 6 side. An oil leakage prevention body 19 made of an elastic body such as an O-ring is fitted into 18. In order to avoid that the groove 18 and the annular space 15 into which the elastic body 16 is fitted are too close to each other, compared with the embodiment shown in FIGS. The inner peripheral surface portion 2c extends to the back side. Others are the same as those of the embodiment shown in FIGS. 1 and 2, and parts having the same configuration are denoted by the same reference numerals.

隙間形成片７ｂの軌道輪側環状壁部７ｂｂを外輪２と嵌合させた構成では、組立性を良くするために、軌道輪側環状壁部７ｂｂと外輪２とをルーズフィットで嵌合させることが行われる。その場合、両者の接触部から基油が軸受外に漏れる可能性がある。上記のように、油漏れ防止体１９を設けることによって、グリース溜まり形成部品７と外輪２の接触部から基油が漏れるのを防ぐことができる。また、図８に示すように、外輪２の内周面部分２ｃに環状の溝２０を設け、この溝２０に上記同様の油漏れ防止体１９を嵌め込んで設けることによっても、基油の漏れを防止できる。 In the configuration in which the race ring-side annular wall portion 7bb of the gap forming piece 7b is fitted to the outer ring 2, the race ring-side annular wall portion 7bb and the outer ring 2 are fitted in a loose fit in order to improve assemblability. Is done. In that case, the base oil may leak out of the bearing from the contact portion between the two. As described above, by providing the oil leakage prevention body 19, it is possible to prevent the base oil from leaking from the contact portion between the grease pool forming component 7 and the outer ring 2. Further, as shown in FIG. 8, an annular groove 20 is provided in the inner peripheral surface portion 2c of the outer ring 2, and the same oil leakage prevention body 19 as described above is fitted into the groove 20 so as to leak the base oil. Can be prevented.

図９はさらに異なる実施形態を示す。この実施形態は、図１および図２の実施形態と異なり、外輪位置決め間座６の内周面の軸方向中央部が、他よりも内径の小さい円筒面からなるガイド部６ｂになっており、このガイド部６ｂの軸受正面側端に軸方向に垂直な段差部６ｃが形成されている。また、グリース溜まり形成部品７の外周面間座嵌合面９ｂの軸受正面側端近くには、外径側に若干盛り上がった抜け止め２１が設けられている。この抜け止め２１は、軸受背面側端は軸方向に垂直な面に形成され、軸受正面側に向かうに従い盛り上がり量が次第に小さくなる形状である。抜け止め２１は、円周方向の全周に設けてもよく、部分的に設けてもよい。 FIG. 9 shows a further different embodiment. In this embodiment, unlike the embodiment of FIGS. 1 and 2, the central portion in the axial direction of the inner peripheral surface of the outer ring positioning spacer 6 is a guide portion 6b made of a cylindrical surface having a smaller inner diameter than the others. A step portion 6c perpendicular to the axial direction is formed at the bearing front side end of the guide portion 6b. Further, a stopper 21 that slightly rises to the outer diameter side is provided near the bearing front side end of the outer peripheral face spacer fitting surface 9b of the grease reservoir forming component 7. The retainer 21 has a shape in which the bearing rear side end is formed on a surface perpendicular to the axial direction, and the bulging amount gradually decreases toward the bearing front side. The stopper 21 may be provided on the entire circumference in the circumferential direction or may be provided partially.

抜け止め２１の最大盛り上がり量は非常に小さいため、グリース溜まり形成部品７に対して外輪位置決め間座６を軸受正面側からスライドさせて嵌合するのは可能で、両者が嵌合した状態では、抜け止め２１の軸受背面側端の面が外輪位置決め間座６の内周面段差部６ｃに係合することにより、グリース溜まり形成部品７に対し外輪位置決め間座６が抜けることが阻止される。そのため、予めグリース溜まり形成部品７と外輪位置決め間座６とを一体化させた状態で組立を行うことができ、組立作業が容易である。 Since the maximum bulge amount of the stopper 21 is very small, the outer ring positioning spacer 6 can be slid from the bearing front side and fitted to the grease reservoir forming component 7. The surface of the bearing back side end of the retainer 21 is engaged with the inner peripheral surface step portion 6 c of the outer ring positioning spacer 6, thereby preventing the outer ring positioning spacer 6 from slipping out of the grease pool forming component 7. Therefore, the assembly can be performed in a state where the grease reservoir forming component 7 and the outer ring positioning spacer 6 are integrated in advance, and the assembling work is easy.

図１０は、図１および図２に示す転がり軸受装置を用いた工作機械用主軸装置の例を示す。この主軸装置は、２個の転がり軸受装置３０Ａ，３０Ｂを背面組合せで用い、これらの転がり軸受装置３０Ａ，３０Ｂにより主軸３１の両端を回転自在に支持する。各転がり軸受装置３０Ａ，３０Ｂの内輪１は、内輪位置決め間座８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、外輪位置決め間座６、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. 10 shows an example of a spindle device for a machine tool using the rolling bearing device shown in FIGS. This main shaft device uses two rolling bearing devices 30A and 30B in combination on the back surface, and supports both ends of the main shaft 31 rotatably by these rolling bearing devices 30A and 30B. The inner ring 1 of each of the rolling bearing devices 30 A and 30 B is positioned by the inner ring positioning spacer 8 and the 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 an outer ring positioning spacer 6, an outer ring spacer 40, and outer ring pressing 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、一方の端部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、他方の端部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。この主軸装置は、例えばマシニングセンター、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 main shaft 31 is provided with a chuck (not shown) for detachably attaching a tool or a work (not shown) to one end 31a, and the other end 31b has a rotation transmission mechanism (a drive source such as a motor). (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 center, a lathe, a milling machine, and a grinding machine.

上記構成の主軸装置によると、転がり軸受３０Ａ，３０Ｂの隙間１２（図１）から吐出される潤滑油の量を適正に調整することで、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。 According to the spindle device having the above-described configuration, by appropriately adjusting the amount of lubricating oil discharged from the gap 12 (FIG. 1) between the rolling bearings 30A and 30B, the rolling bearings 30A and 30B can be increased in speed, extended life, and maintained. The effect of making free is demonstrated effectively.

１…内輪
１ａ…軌道面
２…外輪（固定側軌道輪）
２ａ…軌道面
２ｂ…段差面
３…転動体
６…外輪位置決め間座
６ａ…端面
７…グリース溜まり形成部品
７ａ…本体部
７ｂ…隙間形成片
７ｂａ…非軌道輪側環状壁部
７ｂｂ…軌道輪側環状壁部
９ｃ…段面
１０…グリース溜まり
１２…隙間
１３…先端面
１４…凸部
１６…弾性体
１７…弾性体用凹部
１８，２０…溝
１９…油漏れ防止体
２１…抜け止め
３０Ａ，３０Ｂ…転がり軸受
３１…主軸 DESCRIPTION OF SYMBOLS 1 ... Inner ring 1a ... Raceway surface 2 ... Outer ring (fixed side raceway)
2a ... Race surface 2b ... Step surface 3 ... Rolling element 6 ... Outer ring positioning spacer 6a ... End surface 7 ... Grease sump forming part 7a ... Main body part 7b ... Gap forming piece 7ba ... Non-ring wheel side annular wall 7bb ... Race wheel side Annular wall 9c ... Step surface 10 ... Grease sump 12 ... Gap 13 ... End face 14 ... Protrusion 16 ... Elastic body 17 ... Recesses for elastic body 18,20 ... Groove 19 ... Oil leakage prevention body 21 ... Retaining stoppers 30A, 30B ... Rolling bearing 31 ... Spindle

Claims

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装置において、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、軌道面に続く段差面を転動体から離れる方向に設け、前記固定側軌道輪に対し、前記段差面が向く方向に隣接して間座を設け、この間座の軸受空間側の周面に嵌合して、内部にグリース溜まりが形成された環状のグリース溜まり形成部品を設け、このグリース溜まり形成部品は、前記間座に嵌合する本体部と、この本体部から前記段差面側へ前記固定側軌道輪の軸受空間側の周面に沿って延びて先端面が前記段差面に対向する中空の隙間形成片とを有し、この隙間形成片を構成する内外の環状壁部につき、前記固定側軌道輪の軸受空間側の周面に沿う軌道輪側環状壁部よりもその反対側の非軌道輪側環状壁部の方を前記段差面側に突出させ、この非軌道輪側環状壁部の先端面に、先端が前記段差面に当接する凸部を設け、この先端面の前記凸部が存在しない箇所と前記段差面との間の隙間が、前記グリース溜まりと連通してグリースの基油を前記固定側軌道輪の軌道面へ導く油路となり、かつ前記軌道輪側環状壁部の基端に、前記本体部に対して径方向の段差を有する段面が形成され、この段面と前記間座の端面とが弾性体を介して対向し、前記固定側軌道輪の段差面と前記間座の端面とで前記軌道輪側環状壁部および前記弾性体を弾性体が圧縮された状態で挟み込んだことを特徴とする転がり軸受装置。 In a rolling bearing device having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings, a stepped surface that follows the raceway surface on the non-rotating fixed raceway of the inner ring and outer ring that are raceways. Is provided in a direction away from the rolling elements, and a spacer is provided adjacent to the fixed side raceway in the direction in which the step surface faces, and the spacer is fitted to the peripheral surface of the spacer on the bearing space side, and grease is contained therein. An annular grease reservoir forming component having a reservoir formed therein is provided. The grease reservoir forming component includes a main body portion that fits into the spacer and a bearing space side of the fixed-side bearing ring from the main body portion to the stepped surface side. A hollow gap forming piece that extends along the circumferential surface of the tip end surface and faces the stepped surface, and the inner and outer annular wall portions that constitute the gap forming piece are arranged on the bearing space side of the fixed-side bearing ring. An annular wall on the race ring side along the circumference of Also, the non-race ring side annular wall portion on the opposite side is protruded toward the step surface side, and a convex portion whose tip abuts on the step surface is provided on the front end surface of the non-race ring side annular wall portion. A gap between the tip surface where the convex portion does not exist and the step surface is an oil passage that communicates with the grease reservoir and guides the base oil of the grease to the raceway surface of the fixed-side raceway, and the raceway A step surface having a radial step with respect to the main body portion is formed at the base end of the ring-side annular wall portion, and the step surface and the end surface of the spacer face each other via an elastic body, and the fixed side A rolling bearing device, wherein the bearing ring-side annular wall portion and the elastic body are sandwiched between the stepped surface of the bearing ring and the end face of the spacer in a state where the elastic body is compressed.

請求項１において、前記固定側軌道輪が外輪である転がり軸受装置。 The rolling bearing device according to claim 1, wherein the fixed-side race is an outer ring.

請求項１または請求項２において、前記弾性体がＯリングである転がり軸受装置。 The rolling bearing device according to claim 1 or 2, wherein the elastic body is an O-ring.

請求項１または請求項２において、前記弾性体がばねである転がり軸受装置。 The rolling bearing device according to claim 1 or 2, wherein the elastic body is a spring.

請求項１ないし請求項４のいずれか１項において、前記軌道輪側環状壁部の段面に前記弾性体が嵌る弾性体用凹部を設け、この弾性体用凹部の底面と前記間座の端面との間に前記弾性体を介在させた転がり軸受装置。 5. The elastic body recess for fitting the elastic body is provided on the step surface of the race ring-side annular wall portion according to claim 1, and the bottom surface of the elastic body recess and the end surface of the spacer A rolling bearing device in which the elastic body is interposed therebetween.

請求項１ないし請求項４のいずれか１項において、前記間座の端面に前記弾性体が嵌る弾性体用凹部を設け、この弾性体用凹部の底面と前記軌道輪側環状壁部の段面との間に前記弾性体を介在させた転がり軸受装置。 5. The elastic body recess for fitting the elastic body is provided on an end surface of the spacer according to claim 1, and a bottom surface of the elastic body recess and a step surface of the ring-side annular wall portion. A rolling bearing device in which the elastic body is interposed therebetween.

請求項１ないし請求項６のいずれか１項において、前記隙間形成片の軌道輪側環状壁部が前記固定側軌道輪の軸受空間側の周面に嵌合し、前記軌道輪側環状壁部における固定側軌道輪側の周面の中間部に環状の溝を設け、この溝に弾性体からなる油漏れ防止体を嵌め込んで設けた転がり軸受装置。 7. The bearing ring-side annular wall portion according to claim 1, wherein a raceway-side annular wall portion of the gap forming piece is fitted to a peripheral surface of the fixed-side raceway on a bearing space side. A rolling bearing device in which an annular groove is provided in an intermediate portion of the peripheral surface on the fixed-side bearing ring side, and an oil leakage prevention body made of an elastic body is fitted in the groove.

請求項１ないし請求項６のいずれか１項において、前記隙間形成片の軌道輪側環状壁部が前記固定側軌道輪の軸受空間側の周面に嵌合し、前記固定側軌道輪の軸受空間側の周面の中間部に環状の溝を設け、この溝に弾性体からなる油漏れ防止体を嵌め込んで設けた転がり軸受装置。 7. The bearing ring-side bearing according to claim 1, wherein a raceway-side annular wall portion of the gap-forming piece is fitted to a peripheral surface of the fixed-side raceway on a bearing space side. A rolling bearing device in which an annular groove is provided in an intermediate portion of a space-side peripheral surface, and an oil leakage prevention body made of an elastic body is fitted in the groove.

請求項１ないし請求項８のいずれか１項において、前記グリース溜まり形成部品本体部の前記間座に対する嵌合面に、前記間座の軸受空間側の周面に前記グリース溜まり形成部品本体部が嵌合した状態で、グリース溜まり形成部品本体部に対して間座が抜けるのを防ぐ抜け止めを設けた転がり軸受装置。 9. The grease reservoir forming component main body according to claim 1, wherein the grease reservoir forming component main body is formed on a fitting surface of the grease reservoir forming component main body with respect to the spacer and on a bearing space side peripheral surface of the spacer. A rolling bearing device provided with a stopper that prevents the spacer from coming off from the grease reservoir forming component main body in a fitted state.

請求項１ないし請求項９のいずれか１項において、工作機械主軸の支持に用いられる転がり軸受装置。 10. The rolling bearing device according to claim 1, wherein the rolling bearing device is used for supporting a machine tool spindle.