JP5739293B2 - Rolling bearing device - Google Patents

Rolling bearing device Download PDF

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JP5739293B2
JP5739293B2 JP2011207723A JP2011207723A JP5739293B2 JP 5739293 B2 JP5739293 B2 JP 5739293B2 JP 2011207723 A JP2011207723 A JP 2011207723A JP 2011207723 A JP2011207723 A JP 2011207723A JP 5739293 B2 JP5739293 B2 JP 5739293B2
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inner ring
circumferential groove
oil
spacer
rolling bearing
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JP2013068279A (en
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裕士 恩田
裕士 恩田
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NTN Corp
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NTN Corp
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Priority to PCT/JP2012/072853 priority patent/WO2013042552A1/en
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Description

この発明は、例えば、工作機械主軸を回転自在に支持する転がり軸受装置に関し、軸受冷却媒体を兼ねる潤滑油を軸受内に供給すると共に、軸受外に排出する給排油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 that rotatably supports a machine tool main shaft, for example, and relates to a rolling bearing provided with a supply / discharge oil mechanism that supplies lubricating oil also serving as a bearing cooling medium into the bearing and discharges it outside the bearing. Relates to the device.

軸受の冷却と、軸受に対する潤滑油の給排油を行う機構を有する潤滑装置が提案されている(特許文献1)。この潤滑装置では、図11に示すように、内輪端面に接する内輪間座50を設け、外輪端面に接する潤滑油導入部材51を設けている。内輪52のうち前記内輪端面から内輪軌道面に繋がる斜面に円周溝53を設けると共に、前記潤滑油導入部材51にノズル54を設け、このノズル54から前記円周溝53内に軸受冷却媒体を兼ねる潤滑油を吐出するようになっている。   There has been proposed a lubricating device having a mechanism for cooling a bearing and supplying and discharging lubricating oil to and from the bearing (Patent Document 1). In this lubricating device, as shown in FIG. 11, an inner ring spacer 50 in contact with the inner ring end face is provided, and a lubricating oil introducing member 51 in contact with the outer ring end face is provided. A circumferential groove 53 is provided on the slope of the inner ring 52 connected from the inner ring end surface to the inner ring raceway surface, a nozzle 54 is provided in the lubricating oil introduction member 51, and a bearing cooling medium is provided from the nozzle 54 into the circumferential groove 53. It is designed to discharge lubricating oil.

特開2008−240946号公報JP 2008-240946 A

図11の構造では、軸受内へ多量の潤滑油が浸入し軸受内で潤滑油が滞留すると、攪拌抵抗が増加し、軸受の温度が上昇して、高速回転が不可能となる場合がある。そのため、軸受内へ浸入した潤滑油の排油を円滑に行う必要がある。   In the structure of FIG. 11, when a large amount of lubricating oil enters the bearing and the lubricating oil stays in the bearing, the stirring resistance increases, the temperature of the bearing rises, and high-speed rotation may be impossible. Therefore, it is necessary to smoothly drain the lubricating oil that has entered the bearing.

ここで本件出願人は、図12に示す転がり軸受装置を提案している。同図に示すように、内輪1には、軸方向に延びる内輪延長部6を設け、外輪2に隣接し且つ内周面が内輪延長部6に対向する間座7を設けている。この場合、軸受運転時、以下の(1)〜(5)のように潤滑油が軸受内部に浸入する。同図における矢符は潤滑油の流れを示す。
(1) 潤滑油を給油路9から供給する。
(2) 潤滑油が内輪円周溝8に当たる。
(3) 潤滑油は、回転中の内輪1から遠心力を受けて、間座7の内周面7aに当たる。
(4) 潤滑油は、内輪延長部6の外周面と、間座7の内周面との径方向すきまから軸受内に浸入する。このとき転がり軸受装置を例えば立軸の支持に用いる場合には、内周面7aに当たった潤滑油が、排油口に向かうまでの経路途中で重力等の作用により、排油口であまり排出されずに軸受内に多量に浸入する場合がある。
(5) このように潤滑油が多量に浸入すると、軸受内に潤滑油が滞留する。この滞留した潤滑油が軸受の発熱の原因となり、高速運転が不可能となる。
Here, the present applicant has proposed a rolling bearing device shown in FIG. As shown in the figure, the inner ring 1 is provided with an inner ring extension portion 6 that extends in the axial direction, and a spacer 7 that is adjacent to the outer ring 2 and whose inner peripheral surface faces the inner ring extension portion 6. In this case, during the operation of the bearing, the lubricating oil enters the bearing as shown in (1) to (5) below. The arrows in the figure indicate the flow of the lubricating oil.
(1) Supply lubricating oil from the oil supply passage 9.
(2) The lubricating oil hits the inner ring circumferential groove 8.
(3) The lubricating oil receives centrifugal force from the rotating inner ring 1 and hits the inner peripheral surface 7 a of the spacer 7.
(4) Lubricating oil enters the bearing from the radial clearance between the outer peripheral surface of the inner ring extension 6 and the inner peripheral surface of the spacer 7. At this time, when the rolling bearing device is used for supporting the vertical shaft, for example, the lubricating oil hitting the inner peripheral surface 7a is discharged too much at the oil discharge port due to the action of gravity or the like in the course of going to the oil discharge port. In some cases, a large amount may enter the bearing.
(5) When a large amount of lubricating oil enters in this way, the lubricating oil stays in the bearing. This accumulated lubricating oil causes heat generation of the bearing, and high speed operation becomes impossible.

この発明の目的は、軸受内へ浸入した潤滑油を軸受外に円滑に排油し、潤滑油の攪拌抵抗による軸受の温度上昇を抑制することができる転がり軸受装置を提供することである。   An object of the present invention is to provide a rolling bearing device capable of smoothly draining lubricating oil that has entered the bearing to the outside of the bearing and suppressing an increase in the temperature of the bearing due to the stirring resistance of the lubricating oil.

この発明の転がり軸受装置は、内外輪の軌道面間に、保持器に保持された複数の転動体を介在させた転がり軸受と、軸受冷却媒体を兼ねる潤滑油を軸受内に供給すると共に、軸受外に排出する給排油機構とを備えた転がり軸受装置において、前記内輪に軸方向に延びる内輪延長部を設けると共に、外輪に隣接し且つ内周面が前記内輪延長部に対向する間座を設け、前記給排油機構は、内輪延長部の外周面に設けられた内輪円周溝と、前記間座に設けられ、潤滑油を前記内輪円周溝へ向けて吐出する給油口を有する給油路と、前記内輪延長部の外周面のうち内輪円周溝よりも軸受側に形成される外周面と、間座の内周面との間に設けられ、軸受内に潤滑油を導く径方向すきまと、前記間座に設けられ、前記給油口とは異なる円周方向位置で内輪円周溝に連通し、潤滑油を排出する排油口とを有し、前記間座の内周面に、前記内輪円周溝に対向して前記給油口から供給されて内輪円周溝で跳ね返った潤滑油を集める凹み部を設けたことを特徴とする。   The rolling bearing device according to the present invention supplies a rolling bearing in which a plurality of rolling elements held by a cage are interposed between the raceway surfaces of the inner and outer rings, and lubricating oil also serving as a bearing cooling medium into the bearing. In a rolling bearing device having an oil supply / discharge oil mechanism for discharging to the outside, an inner ring extension extending in the axial direction is provided on the inner ring, and a spacer adjacent to the outer ring and having an inner peripheral surface facing the inner ring extension is provided. The oil supply / discharge oil mechanism is provided with an inner ring circumferential groove provided on an outer peripheral surface of an inner ring extension, and an oil supply opening provided in the spacer and discharging lubricating oil toward the inner ring circumferential groove. A radial direction is provided between the outer peripheral surface of the outer ring of the inner ring extension and the inner ring circumferential groove formed on the bearing side and the inner peripheral surface of the spacer, and guides the lubricating oil into the bearing. A clearance and an inner ring provided in the spacer at a circumferential position different from the oil filler opening An oil discharge port that communicates with the circumferential groove and discharges lubricating oil, and is supplied from the oil supply port to the inner circumferential surface of the spacer so as to face the inner ring circumferential groove and bounces off at the inner ring circumferential groove. It is characterized in that a recess for collecting the lubricating oil is provided.

この構成によると、軸受運転時、間座の給油路から潤滑油を供給すると、内輪延長部の外周面の内輪円周溝に沿って潤滑油が流れる。これにより軸受を冷却する。軸受を冷却した油は、間座の排油口から排出される。このとき給油路から供給されて内輪円周溝で跳ね返った潤滑油は、間座の内周面の凹み部に集められ、軸受内への潤滑油の浸入を抑制する。凹み部に集められた潤滑油は、排油口に向かい円滑に排出される。また軸受潤滑のための潤滑油が、径方向すきまを介して軸受内に適量供給され、その後、軸受外に排出される。
前記のように間座の内周面に設けた凹み部に、内輪円周溝で跳ね返った潤滑油を集め、円滑に排出できるため、多量の潤滑油が軸受内に浸入することを防ぐことができる。したがって、潤滑油の攪拌抵抗による軸受の温度上昇を抑制して、軸受の高速回転を可能とすることができる。
According to this configuration, when the lubricating oil is supplied from the oil supply passage of the spacer during the bearing operation, the lubricating oil flows along the inner ring circumferential groove on the outer peripheral surface of the inner ring extension. This cools the bearing. The oil that has cooled the bearing is discharged from the oil outlet of the spacer. At this time, the lubricating oil supplied from the oil supply passage and bounced off by the inner ring circumferential groove is collected in the recess of the inner peripheral surface of the spacer, thereby suppressing the intrusion of the lubricating oil into the bearing. The lubricating oil collected in the recess is smoothly discharged toward the oil discharge port. Also, an appropriate amount of lubricating oil for lubricating the bearing is supplied into the bearing through the radial clearance, and then discharged out of the bearing.
As described above, the lubricating oil bounced off by the inner ring circumferential groove can be collected in the recess provided on the inner peripheral surface of the spacer and smoothly discharged, so that a large amount of lubricating oil can be prevented from entering the bearing. it can. Therefore, it is possible to suppress the temperature rise of the bearing due to the stirring resistance of the lubricating oil and to enable high-speed rotation of the bearing.

前記凹み部は、間座の内周面に設けた円周溝から成るものであっても良い。この場合、円周溝に沿って潤滑油が流れ、この潤滑油を排油口から円滑に排出することができる。
前記凹み部のうち、前記径方向すきまに繋がる開口周縁部の軸方向位置と、内輪円周溝のうち径方向すきまに繋がる開口周縁部の軸方向位置とを一致させ、且つ、凹み部と内輪円周溝との幅寸法を同一としても良い。内輪円周溝に存する潤滑油は、回転中の内輪から遠心力を受けて間座の方向へ進む。このとき凹み部の開口周縁部と、内輪円周溝の開口周縁部との軸方向位置を一致させることにより、潤滑油は、径方向すきま上部を通過する。このため、軸受内に潤滑油が浸入し難くなり、径方向すきま上部を通過した潤滑油は、排油口へ向かう。さらに凹み部と内輪円周溝との幅寸法を同一とすることで、内輪円周溝に存する潤滑油を、内輪からの遠心力により凹み部に確実に集め、凹み部から潤滑油が不所望に溢れることを防止することができる。したがって、排油口以外の箇所から潤滑油が不所望に排出されることを防止することができる。
The said recessed part may consist of a circumferential groove provided in the inner peripheral surface of the spacer. In this case, the lubricating oil flows along the circumferential groove, and this lubricating oil can be smoothly discharged from the oil discharge port.
Among the recesses, the axial position of the opening peripheral part connected to the radial clearance and the axial position of the opening peripheral part connected to the radial clearance of the inner ring circumferential groove are matched, and the recess and the inner ring The width dimension of the circumferential groove may be the same. Lubricating oil in the inner ring circumferential groove receives centrifugal force from the rotating inner ring and proceeds in the direction of the spacer. At this time, the lubricating oil passes through the upper portion of the radial clearance by matching the axial positions of the opening peripheral edge of the recess and the opening peripheral edge of the inner ring circumferential groove. For this reason, it becomes difficult for the lubricating oil to enter the bearing, and the lubricating oil that has passed through the upper portion of the radial clearance goes to the oil outlet. Furthermore, by making the width of the recess and the inner ring circumferential groove the same, the lubricating oil present in the inner ring circumferential groove is reliably collected in the recess by centrifugal force from the inner ring, and the lubricant is not desired from the recess. Can be prevented from overflowing. Therefore, it is possible to prevent the lubricating oil from being undesirably discharged from locations other than the oil discharge port.

前記凹み部は、その底面に向かうに従って幅狭となるものとしても良い。軸受運転時、潤滑油は、内輪円周溝に当たり、内輪回転に伴う遠心力を受けて跳ね返される。この跳ね返された潤滑油は、凹み部の幅狭となる溝、換言すれば楔形状の溝に沿って排油口に向かう。その後、潤滑油は排油口から排出される。潤滑油が、凹み部の幅狭となる溝に沿って排油口に向かうため、内輪円周溝に当たって跳ね返された潤滑油を、効率良く凹み部に集めることができる。   The said recessed part is good also as what becomes narrow as it goes to the bottom face. During the bearing operation, the lubricating oil hits the inner ring circumferential groove and is rebounded by the centrifugal force accompanying the inner ring rotation. The rebounded lubricating oil travels toward the oil discharge port along a groove having a narrow recessed portion, in other words, a wedge-shaped groove. Thereafter, the lubricating oil is discharged from the oil discharge port. Since the lubricating oil is directed to the oil discharge port along the groove that becomes narrower in the recessed portion, the lubricating oil bounced back against the inner ring circumferential groove can be efficiently collected in the recessed portion.

前記凹み部は、間座の内周面に設けた円周溝と、この円周溝の下部に繋がり前記円周溝よりも幅寸法が大となる円周溝とを有するものであっても良い。この場合、内輪円周溝に当たって跳ね返された潤滑油を、前記幅寸法が大となる円周溝に集め、円滑に排油することができる。
前記間座の排油口を、この間座の円周溝に繋がる接線方向に設けたものとしても良い。この場合、間座の給油口から供給された潤滑油は、内輪円周溝に当たって跳ね返され、間座の円周溝に沿って流れ、排油口で滞留することなく円滑に排出される。
Even if the said recessed part has the circumferential groove provided in the inner peripheral surface of the spacer and the circumferential groove which is connected to the lower part of this circumferential groove and whose width dimension is larger than the said circumferential groove. good. In this case, the lubricating oil bounced off against the inner ring circumferential groove can be collected in the circumferential groove having the large width dimension and smoothly drained.
It is good also as what provided the drainage port of the said spacer in the tangent direction connected to the circumferential groove of this spacer. In this case, the lubricating oil supplied from the spacer oil supply port bounces off the inner ring circumferential groove, flows along the circumferential groove of the spacer, and is smoothly discharged without staying at the oil discharge port.

前記凹み部を、間座の給油口から排油口に至る円弧状に設けても良い。この場合、間座の凹み部を流れる潤滑油は、排油口でせき止められる。このせき止められた潤滑油は、速やかに排油口から排出される。
前記内輪円周溝は、撥油性を有するものとしても良い。この場合、内輪円周溝に存する潤滑油を、間座の凹み部に向かい易くし、円滑な排油を行うことができる。
You may provide the said recessed part in the circular arc shape from the oil filler opening of a spacer to an oil drain outlet. In this case, the lubricating oil flowing through the recess of the spacer is blocked by the oil discharge port. The blocked lubricating oil is quickly discharged from the oil discharge port.
The inner ring circumferential groove may have oil repellency. In this case, the lubricating oil existing in the inner ring circumferential groove can be easily directed to the recessed portion of the spacer, and smooth draining can be performed.

前記内輪の外周面のうち内輪軌道面と前記径方向すきまを形成する部分との間に、前記軌道面側に向かうに従って大径となるように傾斜する断面形状に形成された斜面を設けたものであっても良い。この場合、径方向すきまから軸受内に導入された潤滑油を、内輪回転による遠心力により、内輪の前記斜面を経由して内輪軌道面に適量に且つ確実に導くことができる。
前記転がり軸受はアンギュラ玉軸受からなるものであっても良い。
この発明のいずれかの転がり軸受装置は、工作機械主軸の支持に用いられるものであっても良い。
A slope formed in a cross-sectional shape that is inclined so as to become larger in diameter toward the raceway surface side between the inner raceway surface and the portion forming the radial clearance in the outer peripheral surface of the inner ring. It may be. In this case, the lubricating oil introduced into the bearing from the radial clearance can be reliably and appropriately guided to the inner ring raceway surface via the slope of the inner ring by the centrifugal force generated by the inner ring rotation.
The rolling bearing may be an angular ball bearing.
Any of the rolling bearing devices of the present invention may be used for supporting a machine tool spindle.

この発明の転がり軸受は、内外輪の軌道面間に、保持器に保持された複数の転動体を介在させた転がり軸受と、軸受冷却媒体を兼ねる潤滑油を軸受内に供給すると共に、軸受外に排出する給排油機構とを備えた転がり軸受装置において、前記内輪に軸方向に延びる内輪延長部を設けると共に、外輪に隣接し且つ内周面が前記内輪延長部に対向する間座を設けている。前記給排油機構は、内輪延長部の外周面に設けられた内輪円周溝と、前記間座に設けられ、潤滑油を前記内輪円周溝へ向けて吐出する給油口を有する給油路と、前記内輪延長部の外周面のうち内輪円周溝よりも軸受側に形成される外周面と、間座の内周面との間に設けられ、軸受内に潤滑油を導く径方向すきまと、前記間座に設けられ、前記給油口とは異なる円周方向位置で内輪円周溝に連通し、潤滑油を排出する排油口とを有し、前記間座の内周面に、前記内輪円周溝に対向して前記給油口から供給されて内輪円周溝で跳ね返った潤滑油を集める凹み部を設けたものである。このため、軸受内へ浸入した潤滑油を軸受外に円滑に排油し、潤滑油の攪拌抵抗による軸受の温度上昇を抑制することができる。   The rolling bearing according to the present invention supplies a rolling bearing in which a plurality of rolling elements held by a cage are interposed between the raceway surfaces of the inner and outer rings, and a lubricating oil that also serves as a bearing cooling medium into the bearing. In the rolling bearing device having an oil supply / discharge oil mechanism for discharging to the inner ring, an inner ring extension extending in the axial direction is provided on the inner ring, and a spacer adjacent to the outer ring and having an inner peripheral surface facing the inner ring extension is provided. ing. The oil supply / discharge oil mechanism includes an inner ring circumferential groove provided on an outer peripheral surface of an inner ring extension, and an oil supply path provided in the spacer and having an oil supply port that discharges lubricant toward the inner ring circumferential groove. A radial clearance provided between the outer peripheral surface of the inner ring extension portion on the bearing side of the inner ring circumferential groove and the inner peripheral surface of the spacer, and guiding the lubricating oil into the bearing; And provided in the spacer, communicated with the inner ring circumferential groove at a circumferential position different from the oil supply port, and has an oil discharge port for discharging lubricating oil, and on the inner peripheral surface of the spacer, Opposite to the inner ring circumferential groove, a recess is provided for collecting the lubricating oil supplied from the oil supply port and bounced back by the inner ring circumferential groove. For this reason, the lubricating oil that has entered the bearing can be smoothly drained out of the bearing, and the temperature rise of the bearing due to the stirring resistance of the lubricating oil can be suppressed.

この発明の第1の実施形態に係る転がり軸受装置の断面図である。It is sectional drawing of the rolling bearing apparatus which concerns on 1st Embodiment of this invention. 同転がり軸受装置の間座の形状例を示す要部の断面図である。It is sectional drawing of the principal part which shows the example of the shape of the spacer of the same rolling bearing apparatus. 図2のA部の拡大図である。It is an enlarged view of the A section of FIG. (A)は、同転がり軸受装置における潤滑油の流れを示す平面図、(B)は図4(A)の要部の正面図である。(A) is a top view which shows the flow of the lubricating oil in the rolling bearing apparatus, (B) is a front view of the principal part of FIG. 4 (A). この発明の他の実施形態に係る転がり軸受装置の要部の断面図である。It is sectional drawing of the principal part of the rolling bearing apparatus which concerns on other embodiment of this invention. この発明のさらに他の実施形態に係る転がり軸受装置の要部の断面図である。It is sectional drawing of the principal part of the rolling bearing apparatus which concerns on further another embodiment of this invention. この発明のさらに他の実施形態に係る転がり軸受装置における潤滑油の流れを示す平面図である。It is a top view which shows the flow of the lubricating oil in the rolling bearing apparatus which concerns on further another embodiment of this invention. この発明のさらに他の実施形態に係る転がり軸受装置における潤滑油の流れを示す平面図である。It is a top view which shows the flow of the lubricating oil in the rolling bearing apparatus which concerns on further another embodiment of this invention. この発明のさらに他の実施形態に係る転がり軸受装置の断面図である。It is sectional drawing of the rolling bearing apparatus which concerns on other embodiment of this invention. この発明のいずれかの実施形態に係る転がり軸受装置を、工作機械主軸を支持する転がり軸受に適用した例を示す概略断面図である。It is a schematic sectional drawing which shows the example which applied the rolling bearing apparatus which concerns on either embodiment of this invention to the rolling bearing which supports a machine tool main shaft. 従来例の転がり軸受の潤滑装置の要部の断面図である。It is sectional drawing of the principal part of the lubricating device of the rolling bearing of a prior art example. 潤滑油が軸受内部へ浸入する参考提案例を示す要部の断面図である。It is sectional drawing of the principal part which shows the reference proposal example in which lubricating oil permeates into the inside of a bearing.

この発明の第1の実施形態を図1ないし図4と共に説明する。図1に示すように、この実施形態に係る転がり軸受装置は、転がり軸受Brと、給排油機構Kuとを備えている。
図2に示すように、転がり軸受Brは、内外輪1,2である一対の軌道輪と、内外輪1,2の軌道面1a,2a間に介在する複数の転動体3と、これら転動体3を保持するリング状の保持器4とを有する。この転がり軸受はアンギュラ玉軸受からなり、転動体3として、鋼球やセラミックス球等からなる玉が適用される。
A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the rolling bearing device according to this embodiment includes a rolling bearing Br and a supply / discharge oil mechanism Ku.
As shown in FIG. 2, the rolling bearing Br includes a pair of bearing rings that are inner and outer rings 1 and 2, 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 these rolling elements. And a ring-shaped cage 4 that holds 3. The rolling bearing is an angular ball bearing, and a ball made of a steel ball, a ceramic ball or the like is applied as the rolling element 3.

内輪1は、内輪本体部5と、この内輪本体部5から一体に延びる内輪延長部6とを有する。この例では、内輪延長部6は、内輪本体部5の軌道面1aに対し接触角を成す作用線Lの偏り側から幅方向に延びる。内輪本体部5は、軸受としての必要な強度を満たし、且つ、外輪2の幅寸法と同一の幅寸法であって、所定の幅寸法に設けられる。前記所定の幅寸法とは、JIS、軸受カタログ等に規定される内輪の幅寸法である。内輪本体部5における外周面の中央部に軌道面1aが形成されている。前記外周面のうち軌道面1aに繋がる軸方向一方側(軌道面1aと径方向すきまδ1との間)に、軌道面側に向かうに従って大径となるように傾斜する断面形状に形成された斜面1bが形成され、前記外周面のうち軌道面1aに繋がる軸方向他方側に、平坦な外径面1cが形成されている。この内輪本体部5の内輪背面側(軸受正面側)に、内輪延長部6が軸方向一方に延びるように一体に設けられる。
外輪2の軌道面2aの軸方向両側に、外輪内径面2bと、カウンタボア2cとがそれぞれ形成されている。前記外輪内径面2bに保持器4が案内されるように構成されている。
The inner ring 1 has an inner ring main body 5 and an inner ring extension 6 extending integrally from the inner ring main body 5. In this example, the inner ring extension 6 extends in the width direction from the biased side of the action line L that forms a contact angle with the raceway surface 1 a of the inner ring main body 5. The inner ring main body 5 satisfies the necessary strength as a bearing, and has the same width as the outer ring 2 and is provided with a predetermined width. The predetermined width dimension is a width dimension of the inner ring defined in JIS, a bearing catalog or the like. A raceway surface 1 a is formed at the center of the outer peripheral surface of the inner ring main body 5. A slope formed in a cross-sectional shape that inclines so as to increase in diameter toward the raceway surface side on one side in the axial direction (between the raceway surface 1a and the radial clearance δ1) connected to the raceway surface 1a in the outer peripheral surface. 1b is formed, and a flat outer diameter surface 1c is formed on the other side in the axial direction connected to the track surface 1a of the outer peripheral surface. An inner ring extension 6 is integrally provided on the inner ring back side (bearing front side) of the inner ring main body 5 so as to extend in one axial direction.
An outer ring inner diameter surface 2b and a counter bore 2c are formed on both axial sides of the raceway surface 2a of the outer ring 2, respectively. The cage 4 is configured to be guided to the outer ring inner surface 2b.

図1に示すように、給排油機構Kuは、軸受冷却媒体を兼ねる潤滑油を軸受内に供給すると共に、軸受外に排出する機構である。外輪2に隣接して間座7を設け、この間座7の内周面を、内輪延長部6の外周面に対向させている。給排油機構Kuは、内輪円周溝8と、給油路9と、径方向すきまδ1と、排油口10、凹み部11と、斜面1bとを有する。これらのうち内輪円周溝8は、内輪延長部6の外周面に設けられている。   As shown in FIG. 1, the supply / discharge oil mechanism Ku is a mechanism that supplies lubricating oil that also serves as a bearing cooling medium into the bearing and discharges it outside the bearing. A spacer 7 is provided adjacent to the outer ring 2, and the inner peripheral surface of the spacer 7 is opposed to the outer peripheral surface of the inner ring extension 6. The oil supply / discharge oil mechanism Ku includes an inner ring circumferential groove 8, an oil supply passage 9, a radial clearance δ1, an oil discharge port 10, a recessed portion 11, and a slope 1b. Among these, the inner ring circumferential groove 8 is provided on the outer circumferential surface of the inner ring extension 6.

図1左側に示すように、間座7のうち円周方向の一部に、潤滑油を内輪円周溝8へ向けて吐出する給油口18を有する給油路9が形成されている。この給油路9は、間座7の外周面から、凹み部11に径方向に貫通する段付きの貫通孔状に形成されている。すなわち給油路9は、円周溝から成る凹み部8の円周方向の一部に連通する連通孔9aと、この連通孔9aに繋がり前記外周面に開口する座繰り部9bとで成る。座繰り部9bは、連通孔9aに対し同心で同連通孔9aよりも大径に形成されている。図3に示すように、給油路9から供給された潤滑油は、給油口18から吐出されて内輪円周溝8に当たり、回転側の軌道輪である内輪1から遠心力を受けて間座7の凹み部11へ進む。この潤滑油は、図4(A)に示すように、円周溝から成る凹み部11内を、内輪1の回転方向L1と同一方向に進み、排油口10および後述の切欠部13から排出される。   As shown on the left side of FIG. 1, an oil supply passage 9 having an oil supply port 18 that discharges lubricating oil toward the inner ring circumferential groove 8 is formed in a part of the spacer 7 in the circumferential direction. The oil supply passage 9 is formed in a stepped through hole shape that penetrates the recess 11 in the radial direction from the outer peripheral surface of the spacer 7. In other words, the oil supply passage 9 is composed of a communication hole 9a that communicates with a part of the recess 8 formed of a circumferential groove in the circumferential direction, and a counterbore 9b that is connected to the communication hole 9a and opens to the outer peripheral surface. The counterbore 9b is concentric with the communication hole 9a and has a larger diameter than the communication hole 9a. As shown in FIG. 3, the lubricating oil supplied from the oil supply passage 9 is discharged from the oil supply port 18, hits the inner ring circumferential groove 8, receives a centrifugal force from the inner ring 1 that is the rotating raceway ring, and receives the spacer 7 Proceed to the dent 11. As shown in FIG. 4 (A), this lubricating oil proceeds in the same direction as the rotational direction L1 of the inner ring 1 through the recess 11 formed of a circumferential groove, and is discharged from the oil discharge port 10 and a notch 13 described later. Is done.

間座7のうち、前記給油路9とは異なる円周方向位置には、潤滑油を外部に排出する排油口10が形成されている。排油口10は、図1右側に示すように、間座7の外周面から径方向に貫通して内輪円周溝8に連通するように形成されている。図4(A)に示すように、給油路9に対し、排油口10の位相が所定の位相角度α(この例ではα=270度)となるように設けられている。
図2に示すように、径方向すきまδ1は、内輪延長部6の外周面のうち内輪円周溝8よりも軸受側に形成される外周面と、間座7の内周面との間に設けられる。径方向すきまδ1から軸受内に導入された潤滑油は、斜面1b等を経由して内輪軌道面1aに導かれる。
In the spacer 7, an oil discharge port 10 for discharging the lubricating oil to the outside is formed at a circumferential position different from the oil supply passage 9. As shown on the right side of FIG. 1, the oil discharge port 10 is formed so as to penetrate from the outer peripheral surface of the spacer 7 in the radial direction and communicate with the inner ring circumferential groove 8. As shown in FIG. 4 (A), the oil supply passage 9 is provided such that the phase of the oil discharge port 10 is a predetermined phase angle α (α = 270 degrees in this example).
As shown in FIG. 2, the radial clearance δ <b> 1 is between the outer peripheral surface of the inner ring extension 6 on the bearing side of the inner ring circumferential groove 8 and the inner peripheral surface of the spacer 7. Provided. The lubricating oil introduced into the bearing from the radial clearance δ1 is guided to the inner ring raceway surface 1a via the slope 1b and the like.

凹み部11は、間座7の内周面に設けられた円周溝から成る。凹み部11は、内輪円周溝8に対向して、給油路9から供給されて内輪円周溝8で跳ね返った潤滑油を集めるものである。この凹み部11のうち、前述の径方向すきまδ1に繋がる開口周縁部12の軸方向位置P1と、内輪円周溝8のうち径方向すきまδ1に繋がる開口周縁部14の軸方向位置P2とを一致させている。さらに凹み部11の幅寸法H1と、内輪円周溝8の幅寸法H2とを同一寸法としている。   The recess 11 is formed by a circumferential groove provided on the inner peripheral surface of the spacer 7. The recessed portion 11 is opposed to the inner ring circumferential groove 8 and collects lubricating oil supplied from the oil supply passage 9 and bounced back in the inner ring circumferential groove 8. Of the recess 11, the axial position P1 of the opening peripheral edge 12 connected to the aforementioned radial clearance δ1 and the axial position P2 of the opening peripheral edge 14 connected to the radial clearance δ1 of the inner ring circumferential groove 8 are defined. Match. Further, the width dimension H1 of the recess 11 and the width dimension H2 of the inner ring circumferential groove 8 are the same.

固定側の軌道輪である外輪2には、軸受内で潤滑に供された潤滑油を軸受外に排出する切欠部13が設けられている。図4(B)は、図4(A)の要部の正面図(A−A線端面図)である。図1および図4(B)に示すように、外輪2のうち、間座7が設けられる側とは軸方向逆側の外輪端面に、切欠部13が設けられている。この切欠部13を、図4(A)に示すように、内輪1の回転方向L1に沿う、給油路9と排油口10との間に配設している。この例では、切欠部13は、例えば、給油路9に対し90度の位相角度をもって配設され、且つ、排油口10に対し180度の位相角度をもって配設されている。   The outer ring 2, which is a fixed-side raceway ring, is provided with a notch 13 that discharges lubricating oil used for lubrication in the bearing to the outside of the bearing. 4B is a front view (end view taken along line AA) of the main part of FIG. As shown in FIGS. 1 and 4B, a notch portion 13 is provided on the outer ring end surface of the outer ring 2 on the opposite side in the axial direction from the side where the spacer 7 is provided. As shown in FIG. 4A, the notch 13 is disposed between the oil supply passage 9 and the oil discharge port 10 along the rotation direction L <b> 1 of the inner ring 1. In this example, the notch 13 is disposed with a phase angle of 90 degrees with respect to the oil supply passage 9 and with a phase angle of 180 degrees with respect to the oil discharge port 10, for example.

図2に示すように、内輪延長部6および間座7には、例えば、隣接する軸受内に潤滑油が漏洩することを抑制するラビリンス機構15を設けている。このラビリンス機構15は、給油路9および排油口10(図1)に連通し、広部と狭部とが軸方向に連なるものとしている。前記広部は、内輪延長部6における他方側肩部の外周面に設けられる円周溝16と、この円周溝16に対向する間座7の内周面とを含んで構成される。前記円周溝16は、軸方向に間隔をあけて複数(この例では2つ)配設される。各円周溝16は、内輪延長部6の端面側(図2の上側)に向かうに従って小径となる、換言すると溝が深くなるように傾斜する断面形状に形成されている。前記狭部は、内輪延長部6における前記外周面の突出先端部17と、この突出先端部17に対向する間座7の内周面とを含んで構成される。   As shown in FIG. 2, the inner ring extension 6 and the spacer 7 are provided with, for example, a labyrinth mechanism 15 that suppresses leakage of lubricating oil into adjacent bearings. The labyrinth mechanism 15 communicates with the oil supply passage 9 and the oil discharge port 10 (FIG. 1), and the wide portion and the narrow portion are continuous in the axial direction. The wide portion includes a circumferential groove 16 provided on the outer circumferential surface of the other shoulder portion of the inner ring extension portion 6 and an inner circumferential surface of the spacer 7 facing the circumferential groove 16. A plurality (two in this example) of the circumferential grooves 16 are arranged at intervals in the axial direction. Each circumferential groove 16 has a cross-sectional shape that becomes smaller in diameter toward the end face side (upper side in FIG. 2) of the inner ring extension 6, in other words, is inclined so that the groove becomes deeper. The narrow portion includes a protruding tip 17 of the outer peripheral surface of the inner ring extension 6 and an inner peripheral surface of the spacer 7 facing the protruding tip 17.

各円周溝16が前記のように傾斜する断面形状に形成されているため、給油路9から供給されてラビリンス機構15に浸入した潤滑油は、内輪回転による遠心力により円周溝16の傾斜面に沿って漏れ側とは反対方向に移動する。このようなラビリンス機構15により、隣接する軸受内に潤滑油が漏洩することを抑制し得る。なお、円周溝16は、3つ以上であっても良いし1つであっても良い。内輪延長部6に円周溝16を設ける構成に代えて、間座7における断面凹形状の前記他方側肩部に、円周溝を設けても良い。また内輪延長部6および間座7にそれぞれ円周溝を設けても良い。   Since each circumferential groove 16 is formed in an inclined cross-sectional shape as described above, the lubricating oil supplied from the oil supply passage 9 and entering the labyrinth mechanism 15 is inclined by the centrifugal force due to the inner ring rotation. Move along the surface in the opposite direction to the leak side. Such a labyrinth mechanism 15 can prevent the lubricating oil from leaking into the adjacent bearing. Note that the number of circumferential grooves 16 may be three or more, or one. Instead of the configuration in which the circumferential groove 16 is provided in the inner ring extension 6, a circumferential groove may be provided in the other shoulder portion having a concave cross section in the spacer 7. Moreover, you may provide a circumferential groove in the inner ring extension part 6 and the spacer 7, respectively.

作用効果について説明する。
図1における矢符は潤滑油の流れを示す。同図1に示すように、軸受運転時、間座7の給油路9から潤滑油を供給すると、内輪延長部6の外周面の内輪円周溝8に沿って潤滑油が流れる。これにより軸受を冷却する。軸受を冷却した油は、間座7の排油口10から排出される。このとき給油路9から供給されて内輪円周溝8で跳ね返った潤滑油は、間座7の内周面の凹み部11に集められ、軸受内への潤滑油の浸入を抑制する。円周溝から成る凹み部11に集められた潤滑油は、前記円周溝に沿って流れ、排油口10に向かい円滑に排出される。また軸受潤滑のための潤滑油が、径方向すきまδ1を介して軸受内に適量供給され、その後軸受外に排出される。
前記のように間座7の内周面に設けた凹み部11に、内輪円周溝8で跳ね返った潤滑油を集め、円滑に排出できるため、多量の潤滑油が軸受内に浸入することを防ぐことができる。したがって、潤滑油の攪拌抵抗による軸受の温度上昇を抑制して、軸受の高速回転を可能とすることができる。
The effect will be described.
1 indicate the flow of the lubricating oil. As shown in FIG. 1, when the lubricating oil is supplied from the oil supply passage 9 of the spacer 7 during the bearing operation, the lubricating oil flows along the inner ring circumferential groove 8 on the outer peripheral surface of the inner ring extension 6. This cools the bearing. The oil that has cooled the bearing is discharged from the oil discharge port 10 of the spacer 7. At this time, the lubricating oil supplied from the oil supply passage 9 and bounced off by the inner ring circumferential groove 8 is collected in the recess 11 on the inner peripheral surface of the spacer 7 to suppress the intrusion of the lubricating oil into the bearing. Lubricating oil collected in the recess 11 formed of a circumferential groove flows along the circumferential groove and is smoothly discharged toward the oil discharge port 10. In addition, an appropriate amount of lubricating oil for lubricating the bearing is supplied into the bearing through the radial clearance δ1, and then discharged out of the bearing.
Since the lubricating oil bounced off by the inner ring circumferential groove 8 can be collected in the recess 11 provided on the inner peripheral surface of the spacer 7 as described above and discharged smoothly, a large amount of lubricating oil can enter the bearing. Can be prevented. Therefore, it is possible to suppress the temperature rise of the bearing due to the stirring resistance of the lubricating oil and to enable high-speed rotation of the bearing.

また軸受運転時、図3に示すように、内輪円周溝8に存する潤滑油は、回転中の内輪1から遠心力を受けて間座7の方向へ進む。このとき凹み部11の開口周縁部12と、内輪円周溝8の開口周縁部14との軸方向位置P1,P2を一致させることにより、潤滑油は、径方向すきま上部を通過する。このため、軸受内に潤滑油が浸入し難くなり、径方向すきま上部を通過した潤滑油は、排油口10(図1)へ向かう。さらに凹み部11と内輪円周溝8との幅寸法H1,H2を同一とすることで、内輪円周溝8に存する潤滑油を、内輪1からの遠心力により凹み部11に確実に集め、凹み部11から潤滑油が不所望に溢れることを防止することができる。したがって、排油口以外の箇所から潤滑油が不所望に排出されることを防止することができる。
内輪本体部5の外周面のうち軌道面1aと径方向すきまδ1を形成する部分との間に、軌道面1a側に向かうに従って大径となるように傾斜する断面形状に形成された斜面1bが形成されたため、径方向すきまδ1から軸受内に導入された潤滑油を、内輪回転による遠心力により、斜面1bを経由して軌道面1aに適量に且つ確実に導くことができる。
Further, during the bearing operation, as shown in FIG. 3, the lubricating oil present in the inner ring circumferential groove 8 receives a centrifugal force from the rotating inner ring 1 and advances toward the spacer 7. At this time, by matching the axial positions P1 and P2 between the opening peripheral edge 12 of the recess 11 and the opening peripheral edge 14 of the inner ring circumferential groove 8, the lubricating oil passes through the upper part of the radial clearance. For this reason, it becomes difficult for the lubricating oil to enter the bearing, and the lubricating oil that has passed through the upper portion of the radial clearance goes to the oil discharge port 10 (FIG. 1). Furthermore, by making the width dimensions H1, H2 of the recess 11 and the inner ring circumferential groove 8 the same, the lubricating oil present in the inner ring circumferential groove 8 is reliably collected in the recess 11 by the centrifugal force from the inner ring 1, It is possible to prevent the lubricant from overflowing from the recess 11 undesirably. Therefore, it is possible to prevent the lubricating oil from being undesirably discharged from locations other than the oil discharge port.
Between the raceway surface 1a and the portion forming the radial clearance δ1 on the outer peripheral surface of the inner ring main body 5, there is a slope 1b formed in a cross-sectional shape that is inclined so as to increase in diameter toward the raceway surface 1a. Therefore, the lubricating oil introduced into the bearing from the radial clearance δ1 can be guided to the raceway surface 1a in an appropriate amount through the inclined surface 1b by the centrifugal force generated by the inner ring rotation.

他の実施形態について説明する。
以下の説明においては、各形態で先行する形態で説明している事項に対応している部分には同一の参照符を付し、重複する説明を略する。構成の一部のみを説明している場合、構成の他の部分は、特に記載のない限り先行して説明している形態と同様とする。
Another embodiment will be described.
In the following description, the same reference numerals are given to the portions corresponding to the matters described in the preceding forms in each embodiment, and the overlapping description is omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in advance unless otherwise specified.

図5に示すように、間座7の凹み部11は、その底面に向かうに従って幅狭となるものとしても良い。この場合、潤滑油は、軸受運転時、以下の(1)〜(3)のように流れる。
(1) 潤滑油は、内輪円周溝8に当たり、内輪回転に伴う遠心力を受けて跳ね返される。
(2) この跳ね返された潤滑油は、凹み部11の幅狭となる溝、換言すれば楔形状の溝に沿って排油口10に向かう。
(3) その後、潤滑油は排油口10から排出される。
このように潤滑油が、凹み部11の幅狭となる溝に沿って排油口10に向かうため、内輪円周溝8に当たって跳ね返された潤滑油を、効率良く凹み部11に集めることができる。
As shown in FIG. 5, the recessed part 11 of the spacer 7 is good also as what becomes narrow as it goes to the bottom face. In this case, the lubricating oil flows as shown in the following (1) to (3) during the bearing operation.
(1) The lubricating oil hits the inner ring circumferential groove 8 and is bounced back under the centrifugal force accompanying the inner ring rotation.
(2) The rebounded lubricating oil travels toward the oil discharge port 10 along a narrow groove of the recess 11, in other words, a wedge-shaped groove.
(3) Thereafter, the lubricating oil is discharged from the oil discharge port 10.
Thus, since the lubricating oil is directed to the oil discharge port 10 along the narrow groove of the dent 11, the lubricating oil bounced off against the inner ring circumferential groove 8 can be efficiently collected in the dent 11. .

図6に示すように、間座7の凹み部11は、間座7の内周面に設けた円周溝11aと、この円周溝11aの下部に繋がり前記円周溝11aよりも幅寸法H1aが大となる円周溝11bとを有するものであっても良い。この場合、内輪円周溝8に当たって跳ね返された潤滑油を、幅寸法が大となる円周溝11bに集め、円滑に排油することができる。   As shown in FIG. 6, the recessed part 11 of the spacer 7 is connected to the circumferential groove 11a provided on the inner peripheral surface of the spacer 7 and the lower part of the circumferential groove 11a, and is wider than the circumferential groove 11a. You may have the circumferential groove | channel 11b from which H1a becomes large. In this case, the lubricating oil bounced off by hitting the inner ring circumferential groove 8 can be collected in the circumferential groove 11b having a large width dimension and drained smoothly.

図7は、さらに他の実施形態に係る転がり軸受装置における潤滑油の流れを示す平面図である。同図に示すように、間座7の排油口10に繋がる接線方向L2に設けたものとしても良い。この場合、間座7の給油路9から供給された潤滑油は、内輪円周溝(図示せず)に当たって跳ね返され、間座7の円周溝11に沿って流れ、排油口10で滞留することなく円滑に排出される。
図8に示すように、間座7の凹み部11を、この間座7の給油路9から排油口10に至る円弧状に設けても良い。この場合、間座7の凹み部11を流れる潤滑油は、排油口10でせき止められる。このせき止められた潤滑油は、速やかに排油口10から排出される。
FIG. 7 is a plan view showing a flow of lubricating oil in a rolling bearing device according to still another embodiment. As shown in the figure, it may be provided in the tangential direction L2 connected to the oil drain port 10 of the spacer 7. In this case, the lubricating oil supplied from the oil supply passage 9 of the spacer 7 bounces back against the inner ring circumferential groove (not shown), flows along the circumferential groove 11 of the spacer 7, and stays at the oil discharge port 10. It is discharged smoothly without doing.
As shown in FIG. 8, the recess 11 of the spacer 7 may be provided in an arc shape extending from the oil supply passage 9 of the spacer 7 to the oil discharge port 10. In this case, the lubricating oil flowing through the recess 11 of the spacer 7 is blocked by the oil discharge port 10. The blocked lubricating oil is quickly discharged from the oil discharge port 10.

図9のA部に示すように、内輪円周溝8は、撥油性を有するものとしても良い。内輪円周溝8に、例えば、フッ素樹脂等から成るコーティング層等を設けることにより、撥油性を有する内輪円周溝8とすることができる。この場合、内輪円周溝8に存する潤滑油を、間座7の凹み部11に向かい易くし、円滑な排油を行うことができる。また図9のB部に示すように、径方向すきまδ1を形成する部分である、内輪延長部6の外周面部分および間座7の内周面部分も、撥油性を有するものとしても良い。この場合、軸受内部への潤滑油の浸入を抑制することができる。   As shown in part A of FIG. 9, the inner ring circumferential groove 8 may have oil repellency. By providing the inner ring circumferential groove 8 with, for example, a coating layer made of fluororesin or the like, the inner ring circumferential groove 8 having oil repellency can be obtained. In this case, the lubricating oil existing in the inner ring circumferential groove 8 can be easily directed to the recessed portion 11 of the spacer 7 so that smooth drainage can be performed. Further, as shown in part B of FIG. 9, the outer peripheral surface portion of the inner ring extension 6 and the inner peripheral surface portion of the spacer 7 which are portions that form the radial clearance δ1 may also have oil repellency. In this case, intrusion of the lubricating oil into the bearing can be suppressed.

図10は、前述のいずれかの転がり軸受装置を、立型の工作機械主軸の支持に用いた例を概略示す断面図である。この例では、アンギュラ玉軸受を含む転がり軸受装置28,28を、2個背面組み合わせでハウジング29に設置し、これらの転がり軸受装置28,28により主軸30を回転自在に支持する。各軸受装置28における内輪1は、内輪位置決め間座31,31および主軸30の段部30a,30aにより軸方向に位置決めされ、内輪固定ナット32により主軸30に締め付け固定されている。主軸上側の間座7および主軸下側の外輪2は、外輪押え蓋34,34によりハウジング29内に位置決め固定されている。また主軸上側の外輪端面と、主軸下側の間座幅面との間には、外輪間座35が介在されている。   FIG. 10 is a cross-sectional view schematically showing an example in which any of the above-described rolling bearing devices is used to support a vertical machine tool spindle. In this example, two rolling bearing devices 28 and 28 including angular ball bearings are installed in the housing 29 in a combination of the back surfaces, and the main shaft 30 is rotatably supported by these rolling bearing devices 28 and 28. The inner ring 1 in each bearing device 28 is positioned in the axial direction by inner ring positioning spacers 31, 31 and step portions 30 a, 30 a of the main shaft 30, and is fastened and fixed to the main shaft 30 by an inner ring fixing nut 32. The spacer 7 on the upper side of the main shaft and the outer ring 2 on the lower side of the main shaft are positioned and fixed in the housing 29 by outer ring pressing lids 34 and 34. An outer ring spacer 35 is interposed between the outer ring end surface on the upper side of the main shaft and the spacer width surface on the lower side of the main shaft.

ハウジング29は、ハウジング内筒29aとハウジング外筒29b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29cが設けられている。ハウジング内筒29aには、各軸受装置28にそれぞれ潤滑油を供給する供給油路36,36が形成されている。これら供給油路36,36は図示外の潤滑油供給源に接続されている。さらにハウジング内筒29aには、潤滑に供された潤滑油を排出する排油溝37および排油路38が形成されている。排油溝37は、各軸受装置28における切欠部13および排油口10にそれぞれ連通する。各排油溝37に、主軸軸方向に延びる排油路38が繋がり、この排油路38から潤滑油が排出されるようになっている。   The housing 29 is formed by fitting a housing inner cylinder 29a and a housing outer cylinder 29b, and an oil passage groove 29c for cooling is provided in the fitting portion. Supply oil passages 36 and 36 for supplying lubricating oil to the bearing devices 28 are formed in the housing inner cylinder 29a. These supply oil passages 36 are connected to a lubricating oil supply source (not shown). Further, the housing inner cylinder 29 a is formed with an oil drain groove 37 and an oil drain passage 38 for discharging the lubricating oil used for lubrication. The oil drain groove 37 communicates with the notch 13 and the oil drain port 10 in each bearing device 28. Each oil drain groove 37 is connected to an oil drain passage 38 extending in the main shaft axis direction, and the lubricating oil is discharged from the oil drain passage 38.

このように転がり軸受装置28,28を工作機械主軸30の支持に用いた場合、間座7の内周面に設けた凹み部11に、内輪円周溝8で跳ね返った潤滑油を集め、円滑に排出できるため、多量の潤滑油が軸受内に浸入することを防ぐことができる。したがって、潤滑油の攪拌抵抗による軸受の温度上昇を抑制して、軸受の高速回転を可能とすることができる。
本実施形態に係る転がり軸受装置を、横型の工作機械主軸の支持に用いることも可能である。
When the rolling bearing devices 28 and 28 are used for supporting the machine tool main shaft 30 as described above, the lubricating oil bounced off by the inner ring circumferential groove 8 is collected in the recess 11 provided on the inner circumferential surface of the spacer 7 to smoothly Therefore, a large amount of lubricating oil can be prevented from entering the bearing. Therefore, it is possible to suppress the temperature rise of the bearing due to the stirring resistance of the lubricating oil and to enable high-speed rotation of the bearing.
It is also possible to use the rolling bearing device according to the present embodiment for supporting a horizontal machine tool spindle.

1…内輪
2…外輪
3…転動体
4…保持器
6…内輪延長部
7…間座
8…内輪円周溝
9…給油路
10…排油口
11…凹み部
12,14…開口周縁部
18…給油口
Br…転がり軸受
Ku…給排油機構
δ1…径方向すきま
DESCRIPTION OF SYMBOLS 1 ... Inner ring 2 ... Outer ring 3 ... Rolling body 4 ... Cage 6 ... Inner ring extension part 7 ... Spacer 8 ... Inner ring circumferential groove 9 ... Oil supply path 10 ... Oil discharge port 11 ... Depression part 12, 14 ... Opening peripheral part 18 ... Refueling port Br ... Rolling bearing Ku ... Supply / discharge oil mechanism δ1 ... Diameter clearance

Claims (11)

内外輪の軌道面間に、保持器に保持された複数の転動体を介在させた転がり軸受と、軸受冷却媒体を兼ねる潤滑油を軸受内に供給すると共に、軸受外に排出する給排油機構とを備えた転がり軸受装置において、
前記内輪に軸方向に延びる内輪延長部を設けると共に、外輪に隣接し且つ内周面が前記内輪延長部に対向する間座を設け、
前記給排油機構は、
内輪延長部の外周面に設けられた内輪円周溝と、
前記間座に設けられ、潤滑油を前記内輪円周溝へ向けて吐出する給油口を有する給油路と、
前記内輪延長部の外周面のうち内輪円周溝よりも軸受側に形成される外周面と、間座の内周面との間に設けられ、軸受内に潤滑油を導く径方向すきまと、
前記間座に設けられ、前記給油口とは異なる円周方向位置で内輪円周溝に連通し、潤滑油を排出する排油口とを有し、
前記間座の内周面に、前記内輪円周溝に対向して前記給油口から供給されて内輪円周溝で跳ね返った潤滑油を集める凹み部を設けたことを特徴とする転がり軸受装置。
A rolling bearing in which a plurality of rolling elements held by a cage are interposed between the raceway surfaces of the inner and outer rings, and a supply / exhaust oil mechanism that supplies lubricating oil also serving as a bearing cooling medium into the bearing and discharges it outside the bearing. In a rolling bearing device with
An inner ring extension extending in the axial direction is provided on the inner ring, and a spacer adjacent to the outer ring and having an inner peripheral surface facing the inner ring extension is provided.
The oil supply / discharge oil mechanism is
An inner ring circumferential groove provided on the outer circumferential surface of the inner ring extension,
An oil supply passage provided in the spacer and having an oil supply port for discharging the lubricating oil toward the inner ring circumferential groove;
A radial clearance that is provided between the outer peripheral surface of the inner ring extension portion on the bearing side of the inner ring circumferential groove and the inner peripheral surface of the spacer, and guides lubricating oil into the bearing;
Provided in the spacer, and communicated with the inner ring circumferential groove at a circumferential position different from the oil supply port, and has an oil discharge port for discharging lubricating oil,
2. A rolling bearing device according to claim 1, wherein a recess is provided on an inner peripheral surface of the spacer so as to collect lubricating oil supplied from the oil supply port and rebounded from the inner ring circumferential groove so as to face the inner ring circumferential groove.
請求項1において、前記凹み部は、間座の内周面に設けた円周溝から成る転がり軸受装置。   The rolling bearing device according to claim 1, wherein the recessed portion includes a circumferential groove provided on an inner peripheral surface of the spacer. 請求項2において、前記凹み部のうち、前記径方向すきまに繋がる開口周縁部の軸方向位置と、内輪円周溝のうち径方向すきまに繋がる開口周縁部の軸方向位置とを一致させ、且つ、凹み部と内輪円周溝との幅寸法を同一とした転がり軸受装置。   In Claim 2, the axial position of the opening peripheral edge part connected to the radial clearance among the recesses is matched with the axial position of the opening peripheral edge connected to the radial clearance of the inner ring circumferential groove, and A rolling bearing device in which the width dimension of the recess and the inner ring circumferential groove is the same. 請求項2または請求項3において、前記凹み部は、その底面に向かうに従って幅狭となる転がり軸受装置。   4. The rolling bearing device according to claim 2 or 3, wherein the recess becomes narrower toward the bottom surface. 請求項2または請求項3において、前記凹み部は、間座の内周面に設けた円周溝と、この円周溝の下部に繋がり前記円周溝よりも幅寸法が大となる円周溝とを有する転がり軸受装置。   4. The recess according to claim 2, wherein the recess has a circumferential groove provided on an inner circumferential surface of the spacer and a circumferential width that is connected to a lower portion of the circumferential groove and has a larger width than the circumferential groove. A rolling bearing device having a groove. 請求項2ないし請求項5のいずれか1項において、前記間座の排油口を、この間座の円周溝に繋がる接線方向に設けた転がり軸受装置。   The rolling bearing device according to any one of claims 2 to 5, wherein an oil drain port of the spacer is provided in a tangential direction connected to a circumferential groove of the spacer. 請求項1において、前記凹み部を、間座の給油口から排油口に至る円弧状に設けた転がり軸受装置。   The rolling bearing device according to claim 1, wherein the recess is provided in an arc shape extending from an oil supply port of the spacer to an oil discharge port. 請求項1ないし請求項7のいずれか1項において、前記内輪円周溝は、撥油性を有する転がり軸受装置。   The rolling bearing device according to any one of claims 1 to 7, wherein the inner ring circumferential groove has oil repellency. 請求項1ないし請求項8のいずれか1項において、前記内輪の外周面のうち内輪軌道面と前記径方向すきまを形成する部分との間に、前記軌道面側に向かうに従って大径となるように傾斜する断面形状に形成された斜面を設けた転がり軸受装置。   In any 1 item | term of Claim 1 thru | or 8, It becomes so that it may become a large diameter as it goes to the said track surface side between the inner ring track surface and the part which forms the said radial clearance among the outer peripheral surfaces of the said inner ring. A rolling bearing device provided with an inclined surface formed in a cross-sectional shape inclined to the surface. 請求項1ないし請求項9のいずれか1項において、前記転がり軸受はアンギュラ玉軸受からなる転がり軸受装置。   The rolling bearing device according to claim 1, wherein the rolling bearing is an angular ball bearing. 請求項1ないし請求項10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ものである転がり軸受装置。   11. The rolling bearing device according to claim 1, wherein the rolling bearing device is used for supporting a machine tool spindle.
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