JP2020101257A - Bearing device - Google Patents

Bearing device Download PDF

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JP2020101257A
JP2020101257A JP2018241039A JP2018241039A JP2020101257A JP 2020101257 A JP2020101257 A JP 2020101257A JP 2018241039 A JP2018241039 A JP 2018241039A JP 2018241039 A JP2018241039 A JP 2018241039A JP 2020101257 A JP2020101257 A JP 2020101257A
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bearing
case
outer ring
peripheral surface
holes
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JP7146353B2 (en
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淳司 大塚
Junji Otsuka
淳司 大塚
和彦 西宮
Kazuhiko Nishinomiya
和彦 西宮
浩介 琴尾
Kosuke Kotoo
浩介 琴尾
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Toshiba Mitsubishi Electric Industrial Systems Corp
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Toshiba Mitsubishi Electric Industrial Systems Corp
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Priority to CN201910630218.8A priority patent/CN111365369B/en
Publication of JP2020101257A publication Critical patent/JP2020101257A/en
Priority to JP2022131555A priority patent/JP7536412B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/04—Ball or roller bearings, e.g. with resilient rolling bodies
    • F16C27/045—Ball or roller bearings, e.g. with resilient rolling bodies with a fluid film, e.g. squeeze film damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C37/00—Cooling of bearings
    • F16C37/007—Cooling of bearings of rolling bearings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Support Of The Bearing (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

To obtain a bearing device capable of effectively suppressing the reduction of vibrations by a rotary shaft.SOLUTION: A cylindrical bearing case 5 supports a bearing 4 from an outer peripheral side of the bearing 4. The bearing case 5 includes a pair of O-ring grooves 53 annularly provided in a circumferential direction on an outer peripheral surface, a pair of O-rings 51 provided in the pair of O-ring grooves 53, and four case through-holes 50 that are selectively provided on half circle side in the circumferential direction of a side surface of the bearing case 5, and respectively penetrating the side surface, as main structure parts. An outer ring 7 has four outer ring through-holes 70 that are selectively provided and penetrate a side surface of the outer ring 7 respectively, on one half circle side in the circumferential direction of the side surface. The four case through-hole 50 and the four outer ring through-hole 70 are provided at a position relationship corresponding to each other.SELECTED DRAWING: Figure 1

Description

この発明は、高速に回転する回転軸を受ける軸受装置に関する。 The present invention relates to a bearing device that receives a rotating shaft that rotates at high speed.

近年、高速回転用の回転軸に対応可能な軸受装置が要求されている。このため、軸受装置は、回転軸の高速回転に対応するための軸受装置として、潤滑方式を採用する以外に、危険速度等が起因して発生する共振現象を減衰させる減衰機能が必要不可欠となっている。 In recent years, there has been a demand for a bearing device capable of supporting a rotating shaft for high speed rotation. For this reason, the bearing device, as a bearing device for coping with high-speed rotation of the rotary shaft, requires a damping function for attenuating a resonance phenomenon caused by a dangerous speed, etc. in addition to adopting a lubrication method. ing.

このため、軸受外周部に油膜ダンパ（スクイズフィルムダンパ）機構を設け、共振現象による軸受振動を低減させる技術が軸受装置に要求されている。油膜ダンパ機構を設けた軸受装置として例えば特許文献１で開示された軸受支持装置がある。 Therefore, a bearing device is required to have a technique of providing an oil film damper (squeeze film damper) mechanism on the outer peripheral portion of the bearing to reduce the bearing vibration due to a resonance phenomenon. As a bearing device provided with an oil film damper mechanism, for example, there is a bearing support device disclosed in Patent Document 1.

特開２０１３−２０４７４０号公報JP, 2013-204740, A

しかしながら、従来の軸受装置では、回転軸による振動の低減化抑制技術が不十分であるという問題点があった。 However, the conventional bearing device has a problem that the technique for suppressing the reduction of vibration due to the rotating shaft is insufficient.

この発明は上記問題点を解決するためになされたもので、回転軸による振動の低減化を効果的に抑制することができる軸受装置を得ることを目的とする。 The present invention has been made to solve the above problems, and an object of the present invention is to obtain a bearing device that can effectively suppress reduction of vibration due to a rotating shaft.

この発明に係る請求項１記載の軸受装置は、回転軸を回転自在に支持する円筒状の軸受と、前記軸受の外周面側から前記軸受を支持する円筒状の軸受ケースと、前記軸受ケースの外周面に対向する対向面を有し、前記軸受ケースの外周面と対向面とを接触させて軸受ケース５を支持する軸受用のハウジングと、前記軸受ケースの外周面上に油を供給する給油回路とを備え、前記軸受ケースは、外周面上において円周方向に沿って円環状に設けられる一対の溝と、前記一対の溝内に設けられる一対のＯリングと、側面の円周方向における一方半円側に選択的に設けられ、各々が側面を貫通する複数のケース貫通穴とを含み、前記一対のＯリング間における前記軸受ケースの外周面上の領域が油膜形成領域となり、前記複数のケース貫通穴は前記油膜形成領域に設けられ、前記軸受は、前記軸受ケースの内周面に接する外周面を有する円筒状の外輪と、前記外輪との間に内部空間を有するよう設けられる円筒状の内輪とを有し、前記内部空間に転動球が配置され、前記外輪は、側面の円周方向における前記一方半円側において、各々が前記複数のケース貫通穴に対応して選択的に設けられ、側面を貫通する複数の外輪貫通穴を有する。 A bearing device according to a first aspect of the present invention includes a cylindrical bearing that rotatably supports a rotating shaft, a cylindrical bearing case that supports the bearing from an outer peripheral surface side of the bearing, and a bearing case of the bearing case. A housing for a bearing that has an opposing surface that faces the outer peripheral surface and that supports the bearing case 5 by bringing the outer peripheral surface and the opposing surface of the bearing case into contact with each other, and supplying oil to the outer peripheral surface of the bearing case. And a pair of O-rings provided in the pair of grooves, and a pair of O-rings provided in the pair of grooves in a circumferential direction on the outer peripheral surface. On the other hand, a plurality of case through holes that are selectively provided on the semicircle side, each of which penetrates a side surface, are provided, and an area on the outer peripheral surface of the bearing case between the pair of O-rings serves as an oil film forming area. The case through hole is provided in the oil film forming region, and the bearing is a cylinder provided with an inner space between the outer ring and a cylindrical outer ring having an outer peripheral surface in contact with the inner peripheral surface of the bearing case. A ring-shaped inner ring, rolling balls are arranged in the internal space, and the outer ring is selectively arranged on the one semicircle side in the circumferential direction of the side surface, each corresponding to the plurality of case through holes. And has a plurality of outer ring through holes penetrating the side surface.

請求項１記載の本願発明である軸受装置は、油圧回路からの給油により、一対のＯリング間における軸受ケースの外周面上の油膜形成領域に油膜が形成される。すなわち、ハウジングの対向面と軸受ケースの外周面との間に油膜が形成される。 In the bearing device according to the present invention described in claim 1, the oil film is formed in the oil film formation region on the outer peripheral surface of the bearing case between the pair of O-rings by the oil supply from the hydraulic circuit. That is, an oil film is formed between the facing surface of the housing and the outer peripheral surface of the bearing case.

この際、外周面おける軸方向の両端部近傍に一対の溝及び一対のＯリングを設けることにより、軸受ケースの外周面上の大部分の領域を油膜形成領域とすることができるため、比較的広い領域で油膜ダンパ機構を発揮させることができる分、回転軸による振動の低減化を効果的に図ることができる。 At this time, by providing a pair of grooves and a pair of O-rings in the vicinity of both axial ends of the outer peripheral surface, most of the area on the outer peripheral surface of the bearing case can be used as an oil film forming area. Since the oil film damper mechanism can be exhibited in a wide range, it is possible to effectively reduce the vibration due to the rotating shaft.

加えて、軸受ケースの側面を貫通する複数のケース貫通穴及び軸受の側面を貫通する複数の外輪貫通穴を介して、油膜形成領域における油膜を形成する油の一部を軸受内にも供給することができる。このため、請求項１記載の本願発明は、装置を大型化することなく軸受を冷却することができる。 In addition, a part of the oil forming the oil film in the oil film forming region is also supplied into the bearing through the plurality of case through holes penetrating the side surface of the bearing case and the plurality of outer ring through holes penetrating the side surface of the bearing. be able to. Therefore, in the invention of the first aspect, the bearing can be cooled without increasing the size of the device.

軸受内への油の供給は、選択的に形成された複数のケース貫通穴及び複数の外輪貫通穴のみを介して行われるため、軸受内への油供給量を制限して油膜形成領域における油膜の形成を安定して行うことができる。 Since oil is supplied into the bearing only through the plurality of case through holes and the plurality of outer ring through holes that are selectively formed, the oil supply amount in the bearing is limited and the oil film in the oil film formation region is limited. Can be stably formed.

この発明の実施の形態である軸受装置の全体構成を示す説明図である。It is explanatory drawing which shows the whole structure of the bearing device which is embodiment of this invention. 図１で示した軸受ケースの外観構造を模式的に示す斜視図である。It is a perspective view which shows typically the external structure of the bearing case shown in FIG. 図１で示した外輪の外観構造を模式的に示す斜視図である。It is a perspective view which shows typically the external appearance structure of the outer ring shown in FIG. 軸受ケース及び外輪における側面の円周方向における位置関係を模式的に示す説明図である。It is explanatory drawing which shows typically the positional relationship in the circumferential direction of the side surface in a bearing case and an outer ring. 図１で示した内輪の外観構造を模式的に示す斜視図である。It is a perspective view which shows typically the external appearance structure of the inner ring shown in FIG. 本実施の形態の軸受装置における油供給系統を模式的に示すブロック図である。It is a block diagram which shows typically the oil supply system in the bearing device of this Embodiment. 油膜の形成状態を模式的に示す説明図である。It is explanatory drawing which shows the formation state of an oil film typically.

＜実施の形態＞
図１はこの発明の実施の形態である軸受装置の全体構成を示す説明図である。同図に示すように、軸受装置１００は、回転軸９を回転自在に支持する円筒状の軸受４と、軸受４の外周面側から軸受４を支持する円筒状の軸受ケース５と、軸受ケース５の外周面に対向する対向面（内周面）を有し、軸受ケース５の外周面と対向面とを一対のＯリング５１を介して接触させて軸受ケース５を支持する軸受用のハウジング１とを主要構成部として含んでいる。 <Embodiment>
FIG. 1 is an explanatory diagram showing the overall configuration of a bearing device according to an embodiment of the present invention. As shown in the figure, the bearing device 100 includes a cylindrical bearing 4 that rotatably supports the rotating shaft 9, a cylindrical bearing case 5 that supports the bearing 4 from the outer peripheral surface side of the bearing 4, and a bearing case. A housing for a bearing that has an opposing surface (inner peripheral surface) that faces the outer peripheral surface of 5, and supports the bearing case 5 by bringing the outer peripheral surface and the opposing surface of the bearing case 5 into contact with each other through a pair of O-rings 51. 1 and 1 as main components.

図２は図１で示した軸受ケース５の外観構造を模式的に示す斜視図である。図１及び図２に示すように、軸受ケース５は内部に軸受４を収容するため空洞部を有する円筒状を呈している。 FIG. 2 is a perspective view schematically showing the external structure of the bearing case 5 shown in FIG. As shown in FIGS. 1 and 2, the bearing case 5 has a cylindrical shape having a hollow portion for accommodating the bearing 4 therein.

軸受ケース５は、外周面上において円周方向に沿って円環状に設けられる一対のＯリング用溝５３（一対の溝）と、一対のＯリング用溝５３内に設けられる一対のＯリング５１と、軸受ケース５の側面の円周方向における一方半円側（上部半円側）に選択的に設けられ、各々が側面を貫通する４つのケース貫通穴５０（図２では２つのケース貫通穴５０のみ図示）とを主要構成部として含んでいる。なお、図２では説明の都合上、一対のＯリング５１の図示を省略している。 The bearing case 5 has a pair of O-ring grooves 53 (a pair of grooves) provided in an annular shape on the outer peripheral surface along the circumferential direction, and a pair of O-rings 51 provided in the pair of O-ring grooves 53. And four case through-holes 50 (two case through-holes in FIG. 2) that are selectively provided on one semicircle side (upper semicircle side) in the circumferential direction of the side surface of the bearing case 5 and each penetrate the side surface. (Only 50 is shown) is included as a main component. Note that, in FIG. 2, the pair of O-rings 51 are not shown for convenience of description.

このように、軸受ケース５は、側面を貫通する複数のケース貫通穴として４つのケース貫通穴５０を有している。また、図２に示すように、一対のＯリング用溝５３は、軸受ケース５の側面における軸方向（底面と上面とを結ぶ方向）の両端部近傍に設けられる。そして、一対のＯリング５１間における軸受ケース５の外周面上の領域が油膜形成領域Ｒ５となり、４つのケース貫通穴５０は油膜形成領域Ｒ５に選択的に設けられる。 As described above, the bearing case 5 has the four case through holes 50 as a plurality of case through holes penetrating the side surface. Further, as shown in FIG. 2, the pair of O-ring grooves 53 are provided in the side surfaces of the bearing case 5 in the vicinity of both ends in the axial direction (direction connecting the bottom surface and the top surface). An area on the outer peripheral surface of the bearing case 5 between the pair of O-rings 51 serves as an oil film forming area R5, and the four case through holes 50 are selectively provided in the oil film forming area R5.

さらに、図２に示すように、軸受ケース５の側面において、上部半円部と下部半円部との境界に一対の回り止め窪み５５が設けられる。 Further, as shown in FIG. 2, on the side surface of the bearing case 5, a pair of detent recesses 55 are provided at the boundary between the upper semicircular portion and the lower semicircular portion.

一対の回り止め窪み５５に対しハウジング１側から回転方向に拘束することにより、ハウジング１内で軸受ケース５が回転する現象を防止することができる。 By restraining the pair of detent recesses 55 in the rotation direction from the housing 1 side, the phenomenon that the bearing case 5 rotates in the housing 1 can be prevented.

軸受４は、内輪６、外輪７及び転動球８を主要構成要素として含んでいる。外輪７は軸受ケース５内周面に接する外周面を有する円筒状を呈し、内輪６は外輪７との間に内部空間を有するよう設けられる円筒状を呈している。そして、内輪６と外輪７との間の内部空間に転動球８が配置される。 The bearing 4 includes an inner ring 6, an outer ring 7 and rolling balls 8 as main constituent elements. The outer ring 7 has a cylindrical shape having an outer peripheral surface in contact with the inner peripheral surface of the bearing case 5, and the inner ring 6 has a cylindrical shape provided with an inner space between the outer ring 7 and the outer ring 7. Then, the rolling balls 8 are arranged in the internal space between the inner ring 6 and the outer ring 7.

図１に示すように、外輪７は外輪側部７ａ、外輪側部７ｂ及び外輪中心部７ｃにより構成され、外輪側部７ａ，７ｂ間に外輪中心部７ｃが挟まれる位置関係を有している。 As shown in FIG. 1, the outer ring 7 includes an outer ring side portion 7a, an outer ring side portion 7b, and an outer ring center portion 7c, and the outer ring center portion 7c is sandwiched between the outer ring side portions 7a and 7b. ..

外輪７の上部の外輪中心部７ｃにおいて、外輪中心部７ｃを貫通する外輪貫通穴７０が設けられる。さらに、外輪７の下部の外輪中心部７ｃにおいて、外輪中心部７ｃを貫通する貫通穴７１が設けられる。貫通穴７１は、下方領域に、上部領域より幅広構造の回転方向に拘束するための窪みが形成され、この窪みがネジ収容領域７１ｘとなる。 In the outer ring center portion 7c above the outer ring 7, an outer ring through hole 70 penetrating the outer ring center portion 7c is provided. Further, in the outer ring central portion 7c below the outer ring 7, a through hole 71 penetrating the outer ring central portion 7c is provided. In the through hole 71, a recess is formed in the lower region for restraining in the rotational direction of the wider structure than the upper region, and this recess becomes the screw accommodating region 71x.

図３は外輪７の外観構造を模式的に示す斜視図である。図１及び図３に示すように、外輪７は、側面の円周方向における一方半円側（図３の上部半円側）において、各々が複数のケース貫通穴５０に対応して選択的に設けられ、側面を貫通する複数の外輪貫通穴である４つの外輪貫通穴７０（図３では２つの外輪貫通穴７０のみ図示）を有する。 FIG. 3 is a perspective view schematically showing the outer structure of the outer ring 7. As shown in FIG. 1 and FIG. 3, the outer ring 7 selectively corresponds to the plurality of case through holes 50 on one semicircle side (upper semicircle side in FIG. 3) in the circumferential direction of the side surface. It has four outer ring through holes 70 (a plurality of outer ring through holes 70 are shown in FIG. 3) that are provided and that penetrate the side surface.

さらに、外輪７は、側面の円周方向における一方半円側に対向する他方半円側（下部半円側）に設けられる１つの貫通穴７１を有している。 Further, the outer ring 7 has one through hole 71 provided on the other semicircle side (lower semicircle side) facing the one semicircle side in the circumferential direction of the side surface.

図４は軸受ケース５及び外輪７における側面の円周方向における位置関係を模式的に示す説明図である。図４で示すＡ−Ａ断面が図１で示す構造となる。 FIG. 4 is an explanatory view schematically showing the positional relationship between the side faces of the bearing case 5 and the outer ring 7 in the circumferential direction. The AA cross section shown in FIG. 4 becomes the structure shown in FIG.

図４に示すように、軸受ケース５の４つのケース貫通穴５０と、外輪７の４つの外輪貫通穴７０とが、対応するケース貫通穴５０及び外輪貫通穴７０間で連続的に繋がるように、互いに対応する位置関係で設けられる。すなわち、図４に示すように、軸受ケース５の側面の円周方向を規定する円及び外輪７の側面の円周方向を規定する円の共通の中心を中心点Ｃ１とすると、中心点Ｃ１から４つのケース貫通穴５０にかけて延びる４つの直線上に４つの外輪貫通穴７０のうちの一の外輪貫通穴７０が必ず位置するように設けられる。すなわち、４つのケース貫通穴５０と４つの外輪貫通穴７０とは１対１に対応し、対応するケース貫通穴５０と外輪貫通穴７０とは中心点Ｃ１を起点として同一直線上に存在する。 As shown in FIG. 4, the four case through holes 50 of the bearing case 5 and the four outer ring through holes 70 of the outer ring 7 are continuously connected between the corresponding case through holes 50 and the outer ring through holes 70. , Are provided in a positional relationship corresponding to each other. That is, as shown in FIG. 4, when the common center of the circle defining the circumferential direction of the side surface of the bearing case 5 and the circle defining the circumferential direction of the side surface of the outer ring 7 is the center point C1, the center point C1 One of the four outer ring through holes 70 is provided so that it is always located on the four straight lines extending to the four case through holes 50. That is, the four case through holes 50 and the four outer ring through holes 70 correspond to each other one to one, and the corresponding case through holes 50 and the outer ring through holes 70 are present on the same straight line with the center point C1 as the starting point.

なお、外輪貫通穴７０の先端領域は他の領域より油の流通経路が狭くなり、かつ、２つに分岐する絞り構造７０ｓを有し、これら絞り構造７０ｓによって油の流れを制限することにより、軸受４の内輪６及び転動球８に安定した油の供給を行うことができる。 The tip region of the outer ring through hole 70 has a narrower oil flow path than the other regions, and has a throttle structure 70s that branches into two. By restricting the oil flow by these throttle structures 70s, It is possible to stably supply oil to the inner ring 6 and the rolling balls 8 of the bearing 4.

また、図２及び図４に示すように、軸受ケース５の側面において、上部半円部と下部半円部との境界に一対の回り止め窪み５５が設けられる。したがって、一対の回り止め窪み５５を結ぶ線上に中心点Ｃ１が存在する。 Further, as shown in FIGS. 2 and 4, on the side surface of the bearing case 5, a pair of detent cavities 55 are provided at the boundary between the upper semicircular portion and the lower semicircular portion. Therefore, the center point C1 exists on the line connecting the pair of detent cavities 55.

図４に示すように、軸受ケース５及び外輪７は、それぞれの側面の円周方向における上記他方半円側に設けられる軸受ケース５の貫通穴５７及び貫通穴７１を有している。 As shown in FIG. 4, the bearing case 5 and the outer ring 7 have a through hole 57 and a through hole 71 of the bearing case 5 provided on the other semicircle side in the circumferential direction of the respective side surfaces.

図５は内輪６の外観構造を模式的に示す斜視図である。図１及び図５に示すように、内輪６は外輪７との間に内部空間が形成されるように、外輪７の側面より小さい径の側面を有して円筒状に形成される。 FIG. 5 is a perspective view schematically showing the external structure of the inner ring 6. As shown in FIGS. 1 and 5, the inner ring 6 is formed in a cylindrical shape having a side surface smaller in diameter than the side surface of the outer ring 7 so that an inner space is formed between the inner ring 6 and the outer ring 7.

そして、図１に示すように、固定用ネジである底部ネジ７３は、軸受ケース５及び外輪７の側面の上記他方半円側において、外輪７と軸受ケース５との間に設けられ、外輪中心部７ｃの回転方向の動きを拘束している。 Then, as shown in FIG. 1, the bottom screw 73, which is a fixing screw, is provided between the outer ring 7 and the bearing case 5 on the other semicircle side of the side surfaces of the bearing case 5 and the outer ring 7, and the center of the outer ring is provided. The movement of the portion 7c in the rotation direction is restricted.

図６は本実施の形態の軸受装置における油供給系統を模式的に示すブロック図である。同図に示す給油回路１０から軸受ケース５の外周面上に油が供給される。軸受ケース５の外周面上に供給された油は、軸受ケース５の４つのケース貫通穴５０及び外輪７の４つの外輪貫通穴７０のみを介して、軸受４の内部に供給される。 FIG. 6 is a block diagram schematically showing an oil supply system in the bearing device of the present embodiment. Oil is supplied to the outer peripheral surface of the bearing case 5 from the oil supply circuit 10 shown in the figure. The oil supplied to the outer peripheral surface of the bearing case 5 is supplied to the inside of the bearing 4 only through the four case through holes 50 of the bearing case 5 and the four outer ring through holes 70 of the outer ring 7.

なお、図１において、油の流れを矢印で示している。図１に示すように、給油回路１０から軸受ケース５及び外輪７の外輪中心部７ｃを介して軸受４の外輪７及び転動球８に供給された油は、外輪７の外周方向の他方半円側において軸受４から外部に排出される。 In addition, in FIG. 1, the flow of oil is shown by the arrow. As shown in FIG. 1, the oil supplied from the oil supply circuit 10 to the outer ring 7 and the rolling balls 8 of the bearing 4 through the bearing case 5 and the outer ring center portion 7c of the outer ring 7 is the other half of the outer ring 7 in the outer peripheral direction. It is discharged from the bearing 4 to the outside on the circle side.

図７は油膜の形成状態を模式的に示す説明図である。同図に示すように、一対のＯリング５１間における軸受ケース５の外周面上の領域が油膜形成領域Ｒ５となる。したがって、給油回路１０から軸受ケース５の外周面上に油が供給されると、軸受ケース５の外周面とハウジング１の対向面（内周面）との間の油膜形成領域Ｒ５に油膜２５が形成される。 FIG. 7 is an explanatory view schematically showing the formation state of the oil film. As shown in the figure, the region on the outer peripheral surface of the bearing case 5 between the pair of O-rings 51 is the oil film formation region R5. Therefore, when oil is supplied from the oil supply circuit 10 onto the outer peripheral surface of the bearing case 5, the oil film 25 is formed in the oil film forming region R5 between the outer peripheral surface of the bearing case 5 and the facing surface (inner peripheral surface) of the housing 1. It is formed.

本実施の形態の軸受装置は、油圧回路１０からの給油により、図１及び図７に示すように、油膜形成領域Ｒ５に油膜２５が形成される。なぜなら、一対のＯリング５１によって軸受ケース５の外周面上の油膜形成領域Ｒ５は、油膜形成領域Ｒ５に選択的に設けられる４つのケース貫通穴５０を除いて、他の領域から遮断される閉鎖空間となるからである。 In the bearing device of the present embodiment, the oil film 25 is formed in the oil film formation region R5 by the oil supply from the hydraulic circuit 10, as shown in FIGS. 1 and 7. This is because the pair of O-rings 51 closes the oil film formation region R5 on the outer peripheral surface of the bearing case 5 from other regions except the four case through holes 50 selectively provided in the oil film formation region R5. Because it becomes a space.

なお、図７では模式的に示しているため、油膜２５が所定の厚みを有する態様で図示しているが、実際には油膜２５の厚みは微小である。 In addition, since the oil film 25 is illustrated schematically in FIG. 7 so as to have a predetermined thickness, the thickness of the oil film 25 is actually very small.

さらに、図１及び図２に示すように、一対のＯリング用溝５３を軸受ケース５の側面における軸方向の両端部近傍に設けることにより、軸受ケース５の外周面の大部分の領域を油膜形成領域Ｒ５とすることができるため、比較的広い領域で油膜２５による油膜ダンパ機構を発揮させることができる。 Further, as shown in FIGS. 1 and 2, a pair of O-ring grooves 53 are provided in the side surfaces of the bearing case 5 in the vicinity of both axial end portions thereof, so that most of the outer peripheral surface of the bearing case 5 is covered with an oil film. Since it can be the formation region R5, the oil film damper mechanism by the oil film 25 can be exhibited in a relatively wide area.

その結果、本実施の形態の軸受装置１００は、高速回転用の回転軸９に対応し、回転軸９による振動を油膜による減衰によって効果的に低減することができる。 As a result, the bearing device 100 of the present embodiment corresponds to the rotating shaft 9 for high speed rotation, and the vibration caused by the rotating shaft 9 can be effectively reduced by the damping due to the oil film.

加えて、軸受ケース５の４つのケース貫通穴５０（複数のケース貫通穴）及び軸受４の４つの外輪貫通穴７０（複数の外輪貫通穴）を介して、油膜形成領域Ｒ５における油膜２５を形成する油の一部を軸受４内に供給している。このため、本実施の形態の軸受装置１００は、装置を大型化することなく軸受４を冷却することができる。 In addition, the oil film 25 in the oil film formation region R5 is formed through the four case through holes 50 (a plurality of case through holes) of the bearing case 5 and the four outer ring through holes 70 (a plurality of outer ring through holes) of the bearing 4. A part of the oil to be supplied is supplied into the bearing 4. Therefore, the bearing device 100 of the present embodiment can cool the bearing 4 without increasing the size of the device.

この際、軸受４内への油の供給は、油膜形成領域Ｒ５に選択的に形成された４つのケース貫通穴５０と４つの外輪貫通穴７０とのみを介することにより、軸受４への油供給量に制限されることによって、油膜形成領域Ｒ５における油膜２５の形成を安定して行うことができる。 At this time, the oil is supplied into the bearing 4 only through the four case through holes 50 and the four outer ring through holes 70 selectively formed in the oil film forming region R5, so that the oil is supplied to the bearing 4. By limiting the amount, it is possible to stably form the oil film 25 in the oil film formation region R5.

実施の形態の軸受装置１００において、複数の外輪貫通穴７０それぞれの先端領域は他の領域より油の流通経路が狭くなる絞り構造７０ｓを有している。すなわち、軸受装置１００において、外輪７の外輪中心部７ｃに設けられる外輪貫通穴７０の先端領域は他の領域より油の流通経路が狭くなる絞り構造７０ｓを有している。 In the bearing device 100 of the embodiment, each of the plurality of outer ring through holes 70 has a throttle structure 70s in which a tip end region has a narrower oil passage than other regions. That is, in the bearing device 100, the tip region of the outer ring through hole 70 provided in the outer ring central portion 7c of the outer ring 7 has the throttle structure 70s in which the oil flow passage is narrower than the other regions.

このため、実施の形態の軸受装置１００は、軸受４内の内輪６及び転動球８への油の供給をスムーズにして、油膜形成領域Ｒ５における油膜２５の形成を安定して維持することができる。 Therefore, in the bearing device 100 of the embodiment, the oil can be smoothly supplied to the inner ring 6 and the rolling balls 8 in the bearing 4, and the formation of the oil film 25 in the oil film formation region R5 can be stably maintained. it can.

さらに、底部ネジ７３よって、外輪７と軸受ケース５とを固定することにより、外輪７の外輪中心部７ｃによる回転方向の動きを拘束することができる。 Further, by fixing the outer ring 7 and the bearing case 5 with the bottom screw 73, the movement of the outer ring 7 in the rotational direction by the outer ring central portion 7c can be restricted.

その結果、本実施の形態の軸受装置１００は、比較的少ない部材で回転軸９による振動の低減化及び軸受４の冷却を図ることができる効果を奏する。 As a result, the bearing device 100 of the present embodiment has an effect of reducing vibrations due to the rotating shaft 9 and cooling the bearing 4 with relatively few members.

なお、本発明は、その発明の範囲内において、実施の形態を適宜、変形、省略することが可能である。 The present invention can appropriately modify or omit the embodiments within the scope of the invention.

１ ハウジング
４ 軸受
５ 軸受ケース
６ 内輪
７ 外輪
９ 回転軸
２５ 油膜
５０ ケース貫通穴
５１ Ｏリング
５３ Ｏリング用溝
７１ 貫通穴
７０ 外輪貫通穴
７３ 底部ネジ
Ｒ５ 油膜形成領域 1 Housing 4 Bearing 5 Bearing Case 6 Inner Ring 7 Outer Ring 9 Rotating Shaft 25 Oil Film 50 Case Through Hole 51 O Ring 53 O Ring Groove 71 Through Hole 70 Outer Ring Through Hole 73 Bottom Screw R5 Oil Film Forming Area

Claims (3)

回転軸を回転自在に支持する円筒状の軸受と、
前記軸受の外周面側から前記軸受を支持する円筒状の軸受ケースと、
前記軸受ケースの外周面に対向する対向面を有し、前記軸受ケースの外周面と対向面とを接触させて軸受ケース５を支持する軸受用のハウジングと、
前記軸受ケースの外周面上に油を供給する給油回路とを備え、
前記軸受ケースは、
外周面上において円周方向に沿って円環状に設けられる一対の溝と、
前記一対の溝内に設けられる一対のＯリングと、
側面の円周方向における一方半円側に選択的に設けられ、各々が側面を貫通する複数のケース貫通穴とを含み、
前記一対のＯリング間における前記軸受ケースの外周面上の領域が油膜形成領域となり、前記複数のケース貫通穴は前記油膜形成領域に設けられ、
前記軸受は、
前記軸受ケースの内周面に接する外周面を有する円筒状の外輪と、
前記外輪との間に内部空間を有するよう設けられる円筒状の内輪とを有し、前記内部空間に転動球が配置され、
前記外輪は、側面の円周方向における前記一方半円側において、各々が前記複数のケース貫通穴に対応して選択的に設けられ、側面を貫通する複数の外輪貫通穴を有する、
軸受装置。 A cylindrical bearing that rotatably supports the rotating shaft,
A cylindrical bearing case that supports the bearing from the outer peripheral surface side of the bearing,
A housing for a bearing, which has a facing surface facing the outer peripheral surface of the bearing case and supports the bearing case 5 by bringing the outer peripheral surface of the bearing case into contact with the facing surface;
An oil supply circuit for supplying oil onto the outer peripheral surface of the bearing case,
The bearing case is
A pair of grooves provided in an annular shape along the circumferential direction on the outer peripheral surface,
A pair of O-rings provided in the pair of grooves,
Selectively provided on one semicircle side in the circumferential direction of the side surface, each including a plurality of case through holes penetrating the side surface,
An area on the outer peripheral surface of the bearing case between the pair of O-rings serves as an oil film forming area, and the plurality of case through holes are provided in the oil film forming area,
The bearing is
A cylindrical outer ring having an outer peripheral surface in contact with the inner peripheral surface of the bearing case,
And a cylindrical inner ring provided so as to have an internal space between the outer ring, the rolling ball is arranged in the internal space,
The outer ring has a plurality of outer ring through holes each penetrating the side surface, on the one semicircle side in the circumferential direction of the side surface, each of which is selectively provided corresponding to the plurality of case through holes.
Bearing device. 請求項１記載の軸受装置であって、
前記複数の外輪貫通穴それぞれの先端領域は他の領域より油の流通経路が狭くなる絞り構造を有する、
軸受装置。 The bearing device according to claim 1, wherein
The tip region of each of the plurality of outer ring through holes has a throttle structure in which the oil passage is narrower than other regions.
Bearing device. 請求項２記載の軸受装置であって、
前記軸受ケース及び前記外輪の側面の円周方向の前記一方半円側に対向する他方半円側において、前記外輪と前記軸受ケースとの間に設けられる固定用ネジをさらに備える、
軸受装置。 The bearing device according to claim 2,
On the other semicircle side that faces the one semicircle side in the circumferential direction of the side surface of the bearing case and the outer ring, a fixing screw provided between the outer ring and the bearing case is further provided.
Bearing device.
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