JP2014105833A

JP2014105833A - Rolling bearing device

Info

Publication number: JP2014105833A
Application number: JP2012261117A
Authority: JP
Inventors: Yuki Shishihara; 祐樹獅子原; Kiyoshi Tanimoto; 清谷本
Original assignee: JTEKT Corp
Current assignee: JTEKT Corp
Priority date: 2012-11-29
Filing date: 2012-11-29
Publication date: 2014-06-09

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing device capable of supplying a lubricant by an amount corresponding to a rotating speed of a rotary shaft.SOLUTION: A rolling bearing device includes a rolling bearing 11 and a lubricant supply mechanism 50. The lubricant supply mechanism 50 includes an annular fixed body 51 fixed to a housing 2 side, having a lubricant storing portion 52 for storing a lubricant 55 inside, and having an opening portion 53 at the external, an elastically expandable and contractible elastic porous member 58 mounted while closing the opening portion 53 of the annular fixed body 51, and absorbing and holding the lubricant 55 in the lubricant storing portion 52, and a rotary body 61 disposed at an inner peripheral face of the annular fixed body 51 with a slight gap, and rotatable integrally with a rotating shaft 1. A dynamic pressure generating portion 62 for generating dynamic pressure in rotation of the rotary body 61, is formed on an outer peripheral face of the rotary body 61. The elastic porous member 58 is elastically compressed by the dynamic pressure generated in the dynamic pressure generating portion 62 to make the lubricant 55 flow out toward the rolling bearing 11.

Description

この発明は、転がり軸受とその転がり軸受に潤滑剤（グリース、潤滑油等）を供給する潤滑剤供給機構とを備えた転がり軸受装置に関する。 The present invention relates to a rolling bearing device including a rolling bearing and a lubricant supply mechanism that supplies a lubricant (grease, lubricating oil, etc.) to the rolling bearing.

転がり軸受と、その転がり軸受に対し潤滑剤を供給する潤滑剤供給機構とを備えた転がり軸受装置においては、例えば特許文献１に開示されている。
これにおいては、グリース保持部材（外輪間座）に保持されているグリースが、多孔質部材を通して玉軸受の内部に落下することで供給される。 A rolling bearing device including a rolling bearing and a lubricant supply mechanism that supplies a lubricant to the rolling bearing is disclosed in Patent Document 1, for example.
In this case, the grease held in the grease holding member (outer ring spacer) is supplied by dropping into the ball bearing through the porous member.

特開２０１０−１０１３８７号公報JP 2010-101387 A

ところで、特許文献１に開示された転がり軸受装置においては、グリース保持部材のグリースの基油が多孔質部材に浸透してから落下し、玉軸受に供給される構造上、転がり軸受（回転軸）の回転速度に対応する量の基油（潤滑剤）を供給することが困難である。 By the way, in the rolling bearing device disclosed in Patent Document 1, the grease base oil of the grease holding member penetrates into the porous member and then drops and is supplied to the ball bearing, so that the rolling bearing (rotating shaft) is provided. It is difficult to supply an amount of base oil (lubricant) corresponding to the rotational speed of

この発明の目的は、前記問題点に鑑み、回転軸の回転速度に対応する量の潤滑剤を供給可能な転がり軸受装置を提供することである。 In view of the above problems, an object of the present invention is to provide a rolling bearing device capable of supplying an amount of lubricant corresponding to the rotational speed of a rotating shaft.

前記課題を解決するために、この発明の請求項１に係る転がり軸受装置は、回転軸側に配設される内輪と、ハウジング側に配設される外輪と、前記内輪と前記外輪との間の環状空間に転動可能に配設される複数の転動体とを有する転がり軸受と、この転がり軸受に対し潤滑剤を供給する潤滑剤供給機構とを備えた転がり軸受装置であって、
前記潤滑剤供給機構は、前記ハウジング側に固定され、かつ内部に潤滑剤が貯留される潤滑剤貯留部を有し、外部に開口部を有する環状固定体と、
前記環状固定体の開口部を塞ぐようにして取り付けられ、かつ前記潤滑剤貯留部内の潤滑剤を吸収して保持する弾性伸縮可能な弾性多孔質部材と、
前記環状固定体の内周面に僅かな隙間を隔てて配設され、かつ前記回転軸と一体に回転可能に設けられた回転体と、を備え、
前記回転体の外周面には、同回転体の回転時に動圧を発生させる動圧発生部が形成され、
前記動圧発生部に発生する動圧によって前記弾性多孔質部材を弾性圧縮させて潤滑剤を前記転がり軸受に向けて流出させる構成にしてあることを特徴とする。 In order to solve the above problems, a rolling bearing device according to a first aspect of the present invention includes an inner ring disposed on the rotating shaft side, an outer ring disposed on the housing side, and between the inner ring and the outer ring. A rolling bearing device comprising a rolling bearing having a plurality of rolling elements that are rotatably arranged in the annular space, and a lubricant supply mechanism that supplies a lubricant to the rolling bearing,
The lubricant supply mechanism is fixed to the housing side, has a lubricant storage part in which lubricant is stored, and an annular fixed body having an opening on the outside,
An elastic porous member that is attached so as to close the opening of the annular fixed body and elastically stretchable to absorb and retain the lubricant in the lubricant reservoir;
A rotating body that is disposed on the inner peripheral surface of the annular fixed body with a slight gap therebetween, and that is rotatably provided integrally with the rotating shaft,
On the outer peripheral surface of the rotating body, a dynamic pressure generating portion that generates dynamic pressure when the rotating body rotates is formed,
The elastic porous member is elastically compressed by the dynamic pressure generated in the dynamic pressure generating portion so that the lubricant flows out toward the rolling bearing.

前記構成によると、回転軸の回転時には、回転軸と一体に回転する回転体の動圧発生部に動圧（空気の流れによる動圧）が発生する。この動圧によって弾性多孔質部材の内径側を押圧する。すると、弾性多孔質部材が弾性圧縮され、弾性多孔質部材に浸透されている潤滑剤が転がり軸受に向けて流出され、これによって転がり軸受に潤滑剤が供給される。
前記したようにして、回転軸と一体に回転する回転体の動圧発生部に発生する動圧によって、弾性多孔質部材を弾性圧縮させて潤滑剤を転がり軸受に供給する構造上、回転軸の回転速度に応じて潤滑剤を転がり軸受に供給することができる。 According to the above configuration, when the rotating shaft rotates, dynamic pressure (dynamic pressure due to the air flow) is generated in the dynamic pressure generating portion of the rotating body that rotates integrally with the rotating shaft. This dynamic pressure presses the inner diameter side of the elastic porous member. Then, the elastic porous member is elastically compressed, and the lubricant that has permeated the elastic porous member flows out toward the rolling bearing, whereby the lubricant is supplied to the rolling bearing.
As described above, the elastic porous member is elastically compressed by the dynamic pressure generated in the dynamic pressure generating portion of the rotating body that rotates integrally with the rotating shaft, and the lubricant is supplied to the rolling bearing. A lubricant can be supplied to the rolling bearing in accordance with the rotational speed.

請求項２に係る転がり軸受装置は、請求項１に記載の転がり軸受装置であって、
動圧発生部は、径方向における弾性多孔質部材との間で、回転方向に沿って、第１の空間と前記第１の空間よりも小さい第２の空間との組み合わせが形成される構成を有していることを特徴とする。 The rolling bearing device according to claim 2 is the rolling bearing device according to claim 1,
The dynamic pressure generating portion has a configuration in which a combination of the first space and the second space smaller than the first space is formed along the rotational direction between the elastic porous member in the radial direction. It is characterized by having.

前記構成によると、径方向における弾性多孔質部材との間で、回転方向に沿って、第１の空間と前記第１の空間よりも小さい第２の空間との組み合わせが形成されることで、動圧発生部が容易に構成される。 According to the above configuration, a combination of the first space and the second space smaller than the first space is formed along the rotation direction between the elastic porous member in the radial direction. The dynamic pressure generator is easily configured.

請求項３に係る転がり軸受装置は、請求項１又は２に記載の転がり軸受装置であって、
弾性多孔質部材の内周面は、表面粗さが滑らかで気密性を有する被覆層で覆われていることを特徴とする。 The rolling bearing device according to claim 3 is the rolling bearing device according to claim 1 or 2,
The inner peripheral surface of the elastic porous member is covered with a coating layer having a smooth surface roughness and airtightness.

前記構成によると、弾性多孔質部材の内周面に設けられた表面粗さが滑らかで気密性を有する被覆層によって回転体の動圧発生部に発生する動圧を安定よく良好に受けることができる。
このため、回転体の動圧発生部に発生する動圧によって弾性多孔質部材が圧縮不良なく効率よく弾性圧縮され、これによって転がり軸受に潤滑剤が良好に供給される。 According to the above configuration, the dynamic pressure generated in the dynamic pressure generating portion of the rotating body can be stably and satisfactorily received by the coating layer having a smooth and airtight surface roughness provided on the inner peripheral surface of the elastic porous member. it can.
For this reason, the elastic porous member is efficiently elastically compressed without compression failure by the dynamic pressure generated in the dynamic pressure generating portion of the rotating body, whereby the lubricant is satisfactorily supplied to the rolling bearing.

この発明の実施例１に係る転がり軸受装置の軸方向断面図である。It is an axial sectional view of the rolling bearing device according to Embodiment 1 of the present invention. 同じく転がり軸受装置を拡大して示す軸方向断面図である。It is an axial direction sectional view which expands and shows a rolling bearing device similarly. 同じく図２のＩＩＩ−ＩＩＩ線に沿う横断面図である。FIG. 3 is a transverse sectional view taken along the line III-III in FIG. 2. 同じく回転体単体を示す正面図である。It is a front view which similarly shows a rotary body single-piece | unit. この発明の実施例２に係る転がり軸受装置の軸方向断面図である。It is axial direction sectional drawing of the rolling bearing apparatus which concerns on Example 2 of this invention. 動圧発生部の形状を面取り形状に形成した実施態様を示す説明図である。It is explanatory drawing which shows the embodiment which formed the shape of the dynamic pressure generation | occurrence | production part into the chamfering shape. 動圧発生部の形状を凹湾曲形状に形成した実施態様を示す説明図である。It is explanatory drawing which shows the embodiment which formed the shape of the dynamic pressure generation part in the concave curve shape. 図８の（Ａ）は回転体の凹溝状部の軸方向両側を閉塞する閉塞鍔が回転体に一体に形成された実施態様を示す説明図であり、図８の（Ｂ）は、回転体の凹溝状部の軸方向両側を閉塞する閉塞鍔が回転体と別体に形成された実施態様を示す説明図である。FIG. 8A is an explanatory view showing an embodiment in which a closing rod that closes both sides in the axial direction of the concave groove portion of the rotating body is formed integrally with the rotating body, and FIG. It is explanatory drawing which shows the embodiment by which the obstruction | occlusion hook which obstruct | occludes the axial direction both sides of the concave-groove part of a body was formed separately from the rotary body.

この発明を実施するための形態について実施例にしたがって説明する。 A mode for carrying out the present invention will be described in accordance with an embodiment.

この発明の実施例１を図１〜図３にしたがって説明する。
図１に示すように、転がり軸受装置は、転がり軸受１１（図１ではアンギュラ玉軸受）と、この転がり軸受１１に潤滑剤（グリース、潤滑剤等）を供給する潤滑剤供給機構５０とを備える。
転がり軸受１１は、回転軸１（例えば、工作機のスピンドル）の外周面に嵌込まれて配設される内輪２０と、この内輪２０の外周に環状空間を隔て、かつハウジング２に嵌込まれて配設される外輪３０と、内輪２０の外周面の内輪軌道面２２と、外輪３０の内周面の外輪軌道面３２との間の環状空間に保持器４５によって保持された状態で転動可能に配設された複数の転動体４１（図１では玉）とを備える。
また、外輪３０の一端面の内周部には、後述する弾性多孔質部材５８から流出される潤滑剤を転がり軸受１１内に向けて案内する切り欠き状の案内部３３が形成されている。案内部３３は潤滑剤がグリースである場合にはグリースを保持することができる。 A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the rolling bearing device includes a rolling bearing 11 (angular ball bearing in FIG. 1) and a lubricant supply mechanism 50 that supplies a lubricant (grease, lubricant, etc.) to the rolling bearing 11. .
The rolling bearing 11 is fitted in the housing 2 with an inner ring 20 fitted and disposed on the outer circumferential surface of the rotary shaft 1 (for example, a spindle of a machine tool), an annular space on the outer circumference of the inner ring 20. In an annular space between the outer ring 30, the inner ring raceway surface 22 on the outer peripheral surface of the inner ring 20, and the outer ring raceway surface 32 on the inner peripheral surface of the outer ring 30. A plurality of rolling elements 41 (balls in FIG. 1) arranged in a possible manner.
Further, a notch-shaped guide portion 33 that guides a lubricant flowing out from an elastic porous member 58 described later toward the inside of the rolling bearing 11 is formed on the inner peripheral portion of one end surface of the outer ring 30. The guide 33 can hold grease when the lubricant is grease.

図２に示すように、潤滑剤供給機構５０は、環状固定体５１と、弾性多孔質部材５８と、回転体６１とを備える。
図１と図２に示すように、環状固定体５１は、外輪３０に隣接してハウジング２内に嵌込まれて配設（固定）され、これによって環状固定体５１は外輪間座を構成している。また、環状固定体５１の内径寸法は、外輪３０の内径寸法と略同等に設定されている。 As shown in FIG. 2, the lubricant supply mechanism 50 includes an annular fixed body 51, an elastic porous member 58, and a rotating body 61.
As shown in FIGS. 1 and 2, the annular fixed body 51 is disposed and fixed (fixed) in the housing 2 adjacent to the outer ring 30, whereby the annular fixed body 51 forms an outer ring spacer. ing. Further, the inner diameter dimension of the annular fixed body 51 is set substantially equal to the inner diameter dimension of the outer ring 30.

図２と図３に示すように、環状固定体５１の内部には、潤滑剤５５が充填される潤滑剤貯留部５２が環状に形成されている。そして、環状固定体５１の端面（外輪３０の端面に対向する側の端面）には、潤滑剤貯留部５２を開口させる環状の開口部５３が形成されている。 As shown in FIGS. 2 and 3, a lubricant reservoir 52 filled with a lubricant 55 is formed in an annular shape inside the annular fixed body 51. An annular opening 53 that opens the lubricant reservoir 52 is formed on the end face of the annular fixed body 51 (the end face on the side facing the end face of the outer ring 30).

図２と図３に示すように、弾性多孔質部材５８は、耐熱性、耐油性を有する弾性圧縮可能な連続気泡の多孔質材料によって環状に形成され、環状固定体５１の開口部５３を塞ぐようにして環状固定体５１の端面に接着剤によって取り付けられている。
そして、弾性多孔質部材５８は、自由状態では、潤滑剤貯留部５２内の潤滑剤５５（グリースである場合には基油）が浸透し、弾性圧縮されることで潤滑剤を転がり軸受１１に向けて流出させる。
また、この実施例１において、弾性多孔質部材５８の内周面には、表面粗さが滑らかで気密性を有する被覆層５９が貼り付けられ、これによって、弾性多孔質部材５８の内周面が覆われることで、後述する回転体６１の動圧発生部６２に発生する動圧を安定よく良好に受ける。
なお、潤滑剤貯留部５２を開口させる開口部５３は円周方向に連続して環状に形成される他、周方向に断続的に複数個形成されてもよい。これに対応して、弾性多孔質部材５８及び被覆層５９は一つの環状層によって構成されたり、あるいは円周方向に複数個に分割されてもよい。この場合は、弾性多孔質部材５８及び被覆層５９が円周方向に複数個に分割された場合は、それぞれの弾性多孔質部材５８が個別に弾性圧縮可能となり、応答性が向上する（潤滑剤がより一層供給しやすくなる）。 As shown in FIGS. 2 and 3, the elastic porous member 58 is formed in an annular shape by an elastic compressible open-cell porous material having heat resistance and oil resistance, and closes the opening 53 of the annular fixed body 51. Thus, it attaches to the end surface of the annular fixed body 51 with an adhesive.
In the free state, the elastic porous member 58 penetrates the lubricant 55 (base oil in the case of grease) in the lubricant reservoir 52 and elastically compresses the lubricant to roll the bearing 11. Let it flow out.
In the first embodiment, a coating layer 59 having a smooth surface roughness and airtightness is attached to the inner peripheral surface of the elastic porous member 58, and thereby the inner peripheral surface of the elastic porous member 58. As a result, the dynamic pressure generated in the dynamic pressure generating portion 62 of the rotating body 61 described later is stably and satisfactorily received.
In addition, the opening part 53 which opens the lubricant storage part 52 may be formed intermittently in the circumferential direction in addition to being formed annularly continuously in the circumferential direction. Correspondingly, the elastic porous member 58 and the covering layer 59 may be constituted by one annular layer, or may be divided into a plurality in the circumferential direction. In this case, when the elastic porous member 58 and the covering layer 59 are divided into a plurality of parts in the circumferential direction, each elastic porous member 58 can be individually elastically compressed, and the responsiveness is improved (the lubricant). Is easier to supply).

図１と図２に示すように、回転体６１は、環状固定体５１及び弾性多孔質部材５８の内周面に対向する位置において、内輪２０に隣接して回転軸１の外周面に嵌込まれて配設（固定）され、これによって回転体６１は内輪間座を構成している。
また、回転体６１の外径寸法は、環状固定体５１及び弾性多孔質部材５８の内径寸法よりも小さく設定され、回転体６１の外周面と環状固定体５１及び弾性多孔質部材５８の内周面との間には、環状の隙間が形成されている。
図３と図４に示すように、回転体６１の外周面には、同回転体６１の回転時に環状固定体５１及び弾性多孔質部材５８の内周面と協働して空気の動圧を発生させる単数又は複数の動圧発生部６２が形成されている。そして、動圧発生部６２に発生する動圧によって弾性多孔質部材５８を内径側を押圧することで、弾性多孔質部材５８を弾性圧縮させる。これによって、弾性多孔質部材５８内に浸透された潤滑剤５５を転がり軸受１１に向けて流出させるように構成されている。 As shown in FIGS. 1 and 2, the rotating body 61 is fitted into the outer peripheral surface of the rotating shaft 1 adjacent to the inner ring 20 at a position facing the inner peripheral surfaces of the annular fixed body 51 and the elastic porous member 58. It is rarely disposed (fixed), whereby the rotating body 61 forms an inner ring spacer.
The outer diameter of the rotating body 61 is set smaller than the inner diameter of the annular fixed body 51 and the elastic porous member 58, and the outer peripheral surface of the rotating body 61 and the inner periphery of the annular fixed body 51 and the elastic porous member 58 are set. An annular gap is formed between the surfaces.
As shown in FIGS. 3 and 4, air dynamic pressure is applied to the outer peripheral surface of the rotating body 61 in cooperation with the inner peripheral surfaces of the annular fixed body 51 and the elastic porous member 58 when the rotating body 61 rotates. One or a plurality of dynamic pressure generators 62 to be generated are formed. Then, the elastic porous member 58 is elastically compressed by pressing the elastic porous member 58 on the inner diameter side with the dynamic pressure generated in the dynamic pressure generating portion 62. Thus, the lubricant 55 that has penetrated into the elastic porous member 58 is configured to flow out toward the rolling bearing 11.

動圧発生部６２の具体的な構造について説明する。動圧発生部６２は、径方向における環状固定体５１及び弾性多孔質部材５８の内周面との間で、回転方向に沿って、第１の空間１００と、この第１の空間１００よりも小さい第２の空間１０１との組み合わせが単数又は複数設けられるように、回転体６１の外周面に凹部が形成されることで構成される。
この実施例１において、図３に示すように、動圧発生部６２は、回転体６１の外周に対し、回転方向前側が深く、後側に向かってしだいに浅く設定された凹溝状に形成されている。この凹溝状の部分（以下において、凹溝状部１０５と称する。この発明の凹部に相当する。）と環状固定体５１及び弾性多孔質部材５８の内周面との間の空間が第１の空間１００に相当し、回転方向に隣り合う２つの凹溝状部１０５の間に配置されてこれらを繋ぐ頂部１０６と環状固定体５１及び弾性多孔質部材５８の内周面との間の空間が第２の空間１０１に相当する。つまり、回転体６１の回転時には、動圧発生部６２の回転方向後部近傍に空気の動圧が発生する。
具体的には、回転体６１が回転することによって、第１の空間１００における空気が、第１の空間１００よりも小さい第２の空間１０１に向けて相対的に流れ込む。つまり、空気がくさびのように第２の空間１０１に流れ込むことによって、行き場を失った空気による動圧が発生し、第２の空間１０１を構成する頂部１０６と環状固定体５１及び弾性多孔質部材５８の内周面とに対して動圧が作用する。空気が第２の空間１０１に流れ込みやすくなるように、凹溝状部１０５は少なくとも回転方向における後側に向かって浅く傾斜して形成されることが好ましい。 A specific structure of the dynamic pressure generator 62 will be described. The dynamic pressure generating unit 62 is located between the first space 100 and the first space 100 along the rotation direction between the annular fixed body 51 and the inner peripheral surface of the elastic porous member 58 in the radial direction. The concave portion is formed on the outer peripheral surface of the rotating body 61 so that one or a plurality of combinations with the small second space 101 are provided.
In the first embodiment, as shown in FIG. 3, the dynamic pressure generating portion 62 is formed in a concave groove shape that is set deeper on the front side in the rotational direction than the outer periphery of the rotating body 61 and gradually shallower toward the rear side. Has been. A space between the concave groove-like portion (hereinafter referred to as the concave groove-like portion 105 and corresponding to the concave portion of the present invention) and the inner peripheral surface of the annular fixed body 51 and the elastic porous member 58 is the first. The space between the top 106 and the annular fixed body 51 and the inner peripheral surface of the elastic porous member 58, which are arranged between two concave groove portions 105 adjacent to each other in the rotation direction and connect them. Corresponds to the second space 101. That is, when the rotating body 61 rotates, dynamic pressure of air is generated in the vicinity of the rear portion in the rotational direction of the dynamic pressure generator 62.
Specifically, as the rotating body 61 rotates, the air in the first space 100 relatively flows into the second space 101 that is smaller than the first space 100. That is, when the air flows into the second space 101 like a wedge, a dynamic pressure is generated by the air that has lost its destination, and the top portion 106, the annular fixed body 51, and the elastic porous member constituting the second space 101 are generated. A dynamic pressure acts on the inner peripheral surface of 58. It is preferable that the concave groove-shaped portion 105 is formed so as to be shallowly inclined toward at least the rear side in the rotation direction so that air can easily flow into the second space 101.

この実施例１に係る転がり軸受装置は上述したように構成される。
したがって、回転軸１の回転時には、回転軸１と一体に回転する回転体６１の動圧発生部６２に動圧（空気の流れによる動圧）が発生する。この動圧によって弾性多孔質部材５８の内径側を押圧する。すると、弾性多孔質部材５８が弾性圧縮され、弾性多孔質部材５８に浸透されている潤滑剤５５が押し出され、この潤滑剤５５が外輪３０の案内部３３に案内されて転がり軸受１１内に流れる。これによって転がり軸受１１に潤滑剤５５が供給される。
前記したようにして、回転軸１と一体に回転する回転体６１の動圧発生部６２に発生する動圧によって、弾性多孔質部材５８を弾性圧縮させて潤滑剤を転がり軸受１１に供給する構造上、回転軸１が高速回転になるほど、これに同期（連動）して動圧発生部６２に発生する動圧が高くなり、転がり軸受１１に対する潤滑剤５５の供給を多くすることができる。 The rolling bearing device according to the first embodiment is configured as described above.
Therefore, when the rotating shaft 1 rotates, dynamic pressure (dynamic pressure due to the flow of air) is generated in the dynamic pressure generating portion 62 of the rotating body 61 that rotates integrally with the rotating shaft 1. This dynamic pressure presses the inner diameter side of the elastic porous member 58. Then, the elastic porous member 58 is elastically compressed, and the lubricant 55 penetrated into the elastic porous member 58 is pushed out. The lubricant 55 is guided by the guide portion 33 of the outer ring 30 and flows into the rolling bearing 11. . As a result, the lubricant 55 is supplied to the rolling bearing 11.
As described above, the elastic porous member 58 is elastically compressed by the dynamic pressure generated in the dynamic pressure generating portion 62 of the rotating body 61 that rotates integrally with the rotating shaft 1, and the lubricant is supplied to the rolling bearing 11. In addition, the higher the rotation speed of the rotary shaft 1, the higher the dynamic pressure generated in the dynamic pressure generating portion 62 in synchronization (interlocking) with this, and the supply of the lubricant 55 to the rolling bearing 11 can be increased.

また、回転体６１の外周面に対する動圧発生部６２の形状や個数を適宜に変更することによって、所望とする量の潤滑剤５５を転がり軸受１１に供給することが可能となる。
また、回転体６１の外周面に複数の動圧発生部６２を等間隔で配設することで、弾性多孔質部材５８の内周面をバランスよく押圧することができる。 Further, it is possible to supply a desired amount of lubricant 55 to the rolling bearing 11 by appropriately changing the shape and number of the dynamic pressure generating portions 62 with respect to the outer peripheral surface of the rotating body 61.
In addition, by arranging the plurality of dynamic pressure generating portions 62 on the outer peripheral surface of the rotating body 61 at equal intervals, the inner peripheral surface of the elastic porous member 58 can be pressed in a balanced manner.

また、この実施例１において、弾性多孔質部材５８の内周面は、表面粗さが滑らかで気密性を有する被覆層５９で覆われることで、回転体６１の動圧発生部６２に発生する動圧を安定よく良好に受けることができる。
このため、回転体６１の動圧発生部６２に発生する動圧によって弾性多孔質部材５８が圧縮不良なく効率よく弾性圧縮され、これによって転がり軸受１１に潤滑剤５５を良好に供給することができる。 Further, in the first embodiment, the inner peripheral surface of the elastic porous member 58 is covered with the covering layer 59 having a smooth surface roughness and airtightness, and thus is generated in the dynamic pressure generating portion 62 of the rotating body 61. The dynamic pressure can be received stably and satisfactorily.
For this reason, the elastic porous member 58 is efficiently elastically compressed without compression failure by the dynamic pressure generated in the dynamic pressure generating portion 62 of the rotating body 61, whereby the lubricant 55 can be supplied to the rolling bearing 11 satisfactorily. .

次に、この発明の実施例２を図５にしたがって説明する。
この実施例２においては、図５に示すように、内部にグリース等の潤滑剤５５が充填される潤滑剤貯留部１５２を有する環状固定体１５１の内周面に、潤滑剤貯留部１５２を開口させる開口孔１５３が形成されている。また、環状固定体１５１の内周面には、弾性多孔質部材１５８が接着剤等よって貼り付けられている。
また、弾性多孔質部材５８の内周面には、実施例１と同様にして表面粗さが滑らかで気密性を有する被覆層１５９が貼り付けられることが望ましい。
この実施例２のその他の構成は、実施例１と同様に構成されるため、同一構成部分に対し同一符号を付記してその説明は省略する。 Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, as shown in FIG. 5, the lubricant reservoir 152 is opened on the inner peripheral surface of the annular fixed body 151 having the lubricant reservoir 152 filled with a lubricant 55 such as grease. An opening hole 153 is formed. An elastic porous member 158 is attached to the inner peripheral surface of the annular fixed body 151 with an adhesive or the like.
Further, it is desirable that a coating layer 159 having a smooth surface roughness and airtightness is attached to the inner peripheral surface of the elastic porous member 58 in the same manner as in the first embodiment.
Since the other configuration of the second embodiment is configured in the same manner as the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

この実施例２に係る転がり軸受装置は上述したように構成される。
したがって、この実施例２においても、実施例１と同様にして、回転軸１と一体に回転する回転体６１の動圧発生部６２に発生する動圧によって、弾性多孔質部材１５８を弾性圧縮させて潤滑剤５５を転がり軸受１１に供給する構造上、回転軸１の回転速度に対応する量の潤滑剤を転がり軸受１１に供給することができる。 The rolling bearing device according to the second embodiment is configured as described above.
Therefore, also in the second embodiment, similarly to the first embodiment, the elastic porous member 158 is elastically compressed by the dynamic pressure generated in the dynamic pressure generating portion 62 of the rotating body 61 that rotates integrally with the rotary shaft 1. Thus, the amount of lubricant corresponding to the rotational speed of the rotary shaft 1 can be supplied to the rolling bearing 11 because of the structure in which the lubricant 55 is supplied to the rolling bearing 11.

なお、この発明は前記実施例１及び２に限定するものではなく、この発明の要旨を逸脱しない範囲内において、種々の形態で実施することができる。
例えば、前記実施例１及び２においては、回転軸１と一体に回転する回転体６１が一方向へ回転される場合に対し、動圧発生部６２に動圧が発生するように構成したが、回転体が正逆いずれの方向へ回転した場合においても動圧発生部に動圧を発生させることも可能である。例えば、図６に示すように、回転体２６１の外周面を面取り加工して動圧発生部２６２を形成してもよい。この場合、面取り部は、その横断面の中心を通る径方向中心線に対して線対称の形状となる。そして、回転体２６１の外周縁（図６の二点鎖線で示す仮想外周縁）から視て、面取り部は回転方向前後両側が浅く、中央部に向かってしだいに深くなる。
また、図７に示すように、回転体３６１の外周面を面取り部に代えて凹湾曲状に加工して動圧発生部３６２を形成してもよい。この場合においても、凹湾曲状部は、その横断面の中心を通る径方向中心線に対して線対称の形状となる。そして、回転体３６１の外周縁（図７の二点鎖線で示す仮想外周縁）から視て、凹湾曲状部は回転方向前後両側が浅く、中央部に向かってしだいに深くなる。
図６と図７に示すように、回転体２６１の外周面の形状を変化させることによって、第１の空間の容積を適宜調節することができる。このようにして、発生する動圧の大きさを調節することができる。そして、動圧の大きさを調節することによって、潤滑剤の供給量を調節することができる。
また、前記実施例１及び２では、潤滑剤補給機構の潤滑剤貯留部５２、１５２は、転がり軸受１１に隣接する間座のうち、ハウジング２側に配設された外輪間座としての環状固定体５１、１５１に設けられる場合を例示したが、このような形態に限らない。例えば、潤滑剤貯留部５２、１５２は、ハウジング側に配設された外輪の一部に設けられてもよい。
また、前記実施例１及び２では、回転体６１は、転がり軸受１１に隣接する間座のうち、回転軸１側に配設される内輪間座として機能する位置に配設されたが、このような形態に限らない。例えば、回転体は回転軸側に配設される内輪と一体に設けられてもよい。
また、前記実施例１及び２では、凹溝状部１０５の軸方向における両側が開放された状態であるが、このような形態に限らない。
例えば、図８の（ａ）に示すように、回転体６１の凹溝状部１０５の軸方向両側に位置する回転体６１の部分に、凹溝状部１０５の軸方向両側を塞ぐ閉塞鍔６１ａが一体に形成される形態であってもよい。この場合、軸方向に空気が逃げることが抑えられるため、動圧をより一層確実に発生させることができる。
また、図８の（ｂ）に示すように、閉塞鍔６１ｂを回転体６１とは別体に形成して回転軸１の外周面に組み付けてもよい。この場合には回転体６１と閉塞鍔６１ｂとの製作が容易となる。但し、本実施形態では動圧を受ける面が小さくなることを抑制するため、閉塞鍔６１ａ、６１ｂはできるだけ薄く形成することが好ましい（図８の（ａ）及び（ｂ）に示す閉塞鍔６１ａ、６１ｂの軸方向に肉厚は、説明の都合上、実際よりも厚く図示している）。 In addition, this invention is not limited to the said Example 1 and 2, In the range which does not deviate from the summary of this invention, it can implement with a various form.
For example, in the first and second embodiments, the dynamic pressure is generated in the dynamic pressure generating unit 62 when the rotating body 61 that rotates integrally with the rotary shaft 1 is rotated in one direction. It is also possible to generate a dynamic pressure in the dynamic pressure generating section even when the rotating body rotates in either the forward or reverse direction. For example, as shown in FIG. 6, the dynamic pressure generating portion 262 may be formed by chamfering the outer peripheral surface of the rotating body 261. In this case, the chamfered portion has a line-symmetric shape with respect to the radial center line passing through the center of the cross section. Then, as viewed from the outer peripheral edge of the rotating body 261 (virtual outer peripheral edge indicated by a two-dot chain line in FIG. 6), the chamfered portion is shallow on both sides in the rotational direction and gradually becomes deeper toward the central portion.
Further, as shown in FIG. 7, the dynamic pressure generating portion 362 may be formed by processing the outer peripheral surface of the rotating body 361 into a concave curved shape instead of the chamfered portion. Also in this case, the concave curved portion has a line-symmetric shape with respect to the radial center line passing through the center of the cross section. Then, when viewed from the outer peripheral edge of the rotating body 361 (virtual outer peripheral edge indicated by a two-dot chain line in FIG. 7), the concave curved portion is shallow on both sides in the rotational direction and gradually becomes deeper toward the central portion.
As shown in FIGS. 6 and 7, the volume of the first space can be appropriately adjusted by changing the shape of the outer peripheral surface of the rotating body 261. In this way, the magnitude of the generated dynamic pressure can be adjusted. And the supply amount of a lubricant can be adjusted by adjusting the magnitude of the dynamic pressure.
In the first and second embodiments, the lubricant reservoirs 52 and 152 of the lubricant replenishment mechanism are annularly fixed as outer ring spacers disposed on the housing 2 side among the spacers adjacent to the rolling bearing 11. Although the case where it was provided in the bodies 51 and 151 was illustrated, it is not restricted to such a form. For example, the lubricant reservoirs 52 and 152 may be provided in a part of the outer ring disposed on the housing side.
In the first and second embodiments, the rotating body 61 is disposed at a position functioning as an inner ring spacer disposed on the rotating shaft 1 side in the spacer adjacent to the rolling bearing 11. It is not restricted to such a form. For example, the rotating body may be provided integrally with an inner ring disposed on the rotating shaft side.
Moreover, in the said Example 1 and 2, although the both sides in the axial direction of the ditch | groove part 105 are open | released, it is not restricted to such a form.
For example, as shown in FIG. 8A, a blocking rod 61 a that closes both axial sides of the concave groove portion 105 in the portion of the rotary body 61 located on both axial sides of the concave groove portion 105 of the rotary body 61. May be formed integrally. In this case, since air is prevented from escaping in the axial direction, the dynamic pressure can be generated more reliably.
Further, as shown in FIG. 8B, the closing rod 61 b may be formed separately from the rotating body 61 and assembled to the outer peripheral surface of the rotating shaft 1. In this case, the rotating body 61 and the closing rod 61b can be easily manufactured. However, in this embodiment, it is preferable to form the closing rods 61a and 61b as thin as possible in order to prevent the surface receiving the dynamic pressure from becoming small (the closing rods 61a and 61b shown in FIGS. 8A and 8B). The thickness in the axial direction of 61b is shown to be thicker than actual for convenience of explanation).

１回転軸
２ハウジング
１１転がり軸受
２０内輪
３０外輪
４１転動体
４５保持器
５０潤滑剤供給機構
５１環状固定体
５２潤滑剤貯留部
５３開口部
５５潤滑剤
５８弾性多孔質部材
６１回転体
６２動圧発生部
DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Housing 11 Rolling bearing 20 Inner ring 30 Outer ring 41 Rolling body 45 Cage 50 Lubricant supply mechanism 51 Annular fixed body 52 Lubricant storage part 53 Opening part 55 Lubricant 58 Elastic porous member 61 Rotating body 62 Dynamic pressure generation Part

Claims

回転軸側に配設される内輪と、ハウジング側に配設される外輪と、前記内輪と前記外輪との間の環状空間に転動可能に配設される複数の転動体とを有する転がり軸受と、この転がり軸受に対し潤滑剤を供給する潤滑剤供給機構とを備えた転がり軸受装置であって、
前記潤滑剤供給機構は、前記ハウジング側に固定され、かつ内部に潤滑剤が貯留される潤滑剤貯留部を有し、外部に開口部を有する環状固定体と、
前記環状固定体の開口部を塞ぐようにして取り付けられ、かつ前記潤滑剤貯留部内の潤滑剤を吸収して保持する弾性伸縮可能な弾性多孔質部材と、
前記環状固定体の内周面に僅かな隙間を隔てて配設され、かつ前記回転軸と一体に回転可能に設けられた回転体と、を備え、
前記回転体の外周面には、同回転体の回転時に動圧を発生させる単数又は複数の動圧発生部が形成され、
前記動圧発生部に発生する動圧によって前記弾性多孔質部材を弾性圧縮させて潤滑剤を前記転がり軸受に向けて流出させる構成にしてあることを特徴とする転がり軸受装置。 A rolling bearing having an inner ring arranged on the rotating shaft side, an outer ring arranged on the housing side, and a plurality of rolling elements arranged to roll in an annular space between the inner ring and the outer ring. And a rolling bearing device comprising a lubricant supply mechanism for supplying a lubricant to the rolling bearing,
The lubricant supply mechanism is fixed to the housing side, has a lubricant storage part in which lubricant is stored, and an annular fixed body having an opening on the outside,
An elastic porous member that is attached so as to close the opening of the annular fixed body and elastically stretchable to absorb and retain the lubricant in the lubricant reservoir;
A rotating body that is disposed on the inner peripheral surface of the annular fixed body with a slight gap therebetween, and that is rotatably provided integrally with the rotating shaft,
On the outer peripheral surface of the rotating body, one or a plurality of dynamic pressure generating portions that generate dynamic pressure when the rotating body rotates are formed,
A rolling bearing device comprising a structure in which the elastic porous member is elastically compressed by a dynamic pressure generated in the dynamic pressure generating portion and a lubricant flows out toward the rolling bearing.

請求項１に記載の転がり軸受装置であって、
動圧発生部は、径方向における弾性多孔質部材との間で、回転方向に沿って、第１の空間と前記第１の空間よりも小さい第２の空間との組み合わせが形成される構成を有していることを特徴とする転がり軸受装置。 The rolling bearing device according to claim 1,
The dynamic pressure generating portion has a configuration in which a combination of the first space and the second space smaller than the first space is formed along the rotational direction between the elastic porous member in the radial direction. A rolling bearing device comprising:

請求項１又は２に記載の転がり軸受装置であって、
弾性多孔質部材の内周面は、表面粗さが滑らかで気密性を有する被覆層で覆われていることを特徴とする転がり軸受装置。 A rolling bearing device according to claim 1 or 2,
A rolling bearing device characterized in that the inner peripheral surface of the elastic porous member is covered with a coating layer having a smooth surface roughness and airtightness.