JP2009138765A - Bearing unit and its incorporation method - Google Patents

Bearing unit and its incorporation method Download PDF

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Publication number
JP2009138765A
JP2009138765A JP2007312517A JP2007312517A JP2009138765A JP 2009138765 A JP2009138765 A JP 2009138765A JP 2007312517 A JP2007312517 A JP 2007312517A JP 2007312517 A JP2007312517 A JP 2007312517A JP 2009138765 A JP2009138765 A JP 2009138765A
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Japan
Prior art keywords
inner ring
tooth member
tooth
bearing
attachment
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JP2007312517A
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Japanese (ja)
Inventor
Takayasu Ozaki
孝泰 尾嵜
Satoshi Kuruhara
聡 来原
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2007312517A priority Critical patent/JP2009138765A/en
Publication of JP2009138765A publication Critical patent/JP2009138765A/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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07—Fixing them on the shaft or housing with interposition of an element
    • F16C35/073—Fixing them on the shaft or housing with interposition of an element between shaft and inner race ring
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • F16D1/09—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces
    • F16D1/093—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping
    • F16D1/095—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping with clamping effected by ring contraction only
    • F16D1/096—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping with clamping effected by ring contraction only the ring or rings being located between the shaft and the hub
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/10—Force connections, e.g. clamping
    • F16C2226/16—Force connections, e.g. clamping by wedge action, e.g. by tapered or conical parts

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing unit without causing deviation in the axial direction and a creep with a simple structure without using a set screw. <P>SOLUTION: An inner ring 4 is extended in the axial direction, and a male screw part 4b is arranged on an outer peripheral surface of this inner ring extension part 4a. An annular tooth member 3 having a tooth 3c on an inner peripheral surface of one end part is arranged in a position surrounded by an annular fastening member 2 joined by a screw to this male screw part 4b, the inner ring 4 and a rotary shaft A. A slit part 3d and an outer peripheral tapered surface 3a extending in the axial direction from its end surface, are arranged in one end part of this tooth member 3. The fastening member 2 is provided with an inner peripheral tapered surface 2b engaging with the outer peripheral tapered surface 3a on one end side of the tooth member 3. The fastening member 2 is screwed in the inner ring extension part 4a, and the tooth member 3 is thereby engaged with the fastening member 2 and the inner ring 4. One end part of the tooth member 3 is diametrically contracted, and its tooth 3c is made to bite in the rotary shaft A, and the inner ring 4 can be surely fixed to the rotary shaft A. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、スラスト荷重が加わる状態で使用されるベアリングユニットとその組込方法に関する。   The present invention relates to a bearing unit used in a state where a thrust load is applied and a method for assembling the same.

ベアリングユニットは、内輪と外輪の間に複数の転動体を転動自在に配して潤滑用のグリースを封入した転がり軸受を軸受箱に組み込んだもので、機械装置への組み込みを容易にするために、内輪をすきまばめの状態で回転軸に組み付けるタイプのものが多い。そして、このようなタイプのベアリングユニットでは、通常、内輪を軸方向に延長し、この内輪延長部の外周側から軸外周面まで止めねじをねじ込むことにより、内輪を回転軸に固定するようになっている（非特許文献１参照。）。
「ベアリングユニット」、ＮＴＮカタログ、ＮＴＮ株式会社、CAT.No.2400-IX/J、54ページ The bearing unit incorporates a rolling bearing in which a plurality of rolling elements are freely rollable between an inner ring and an outer ring and encloses lubricating grease in a bearing box. In addition, there are many types in which the inner ring is assembled to the rotating shaft with a loose fit. In such a type of bearing unit, the inner ring is normally fixed to the rotating shaft by extending the inner ring in the axial direction and screwing a set screw from the outer peripheral side of the inner ring extension to the outer peripheral surface of the shaft. (See Non-Patent Document 1).
“Bearing unit”, NTN catalog, NTN Corporation, CAT. No. 2400-IX / J, page 54

しかし、上記のように内輪の固定に止めねじを用いたベアリングユニットでは、振動等により止めねじが緩み、内輪の軸に対するクリープ（はめあい面での相対的な周方向ずれ）が生じて内輪や軸が損傷したり、内輪が軸方向にずれて軸受が回転不良を生じたりすることがある。特に、スラスト荷重が加わる状態で使用される場合は、内輪の軸方向ずれが生じやすく、軸受の回転不良が発生することが多い。   However, in the bearing unit using a set screw for fixing the inner ring as described above, the set screw is loosened due to vibration or the like, and creep (relative circumferential displacement on the fitting surface) occurs with respect to the inner ring shaft. May be damaged, or the inner ring may be displaced in the axial direction, causing the bearing to rotate poorly. In particular, when used in a state in which a thrust load is applied, the inner ring is likely to be displaced in the axial direction, and a bearing rotation often occurs.

これに対して、内輪の軸への固定にボール入り止めねじを使用したり、止めねじの先端形状を変更してねじ先端部を軸に食い込ませたりする対策がとられているが、締め付けすぎると内輪が変形し、軸受のスムーズな回転が妨げられるだけでなく、内輪が割れてしまうこともある。   On the other hand, measures have been taken to use a ball-containing set screw to fix the inner ring to the shaft, or to change the tip shape of the set screw to bite the screw tip into the shaft. As a result, the inner ring is deformed and the smooth rotation of the bearing is prevented, and the inner ring may be broken.

また、内輪を組み付ける軸に段付軸を使用し、その段差部に内輪の端面を当接させて段差部でスラスト荷重を支持するようにすれば（非特許文献１参照。）、内輪の軸方向ずれを抑えることができるが、軸が長くなることによりベアリングユニットを組み込む装置が大型化しやすい。   Further, if a stepped shaft is used as the shaft for assembling the inner ring and the end surface of the inner ring is brought into contact with the stepped portion to support the thrust load (see Non-Patent Document 1), the shaft of the inner ring. Although the direction shift can be suppressed, the apparatus incorporating the bearing unit is likely to be enlarged due to the longer shaft.

一方、段付軸を使用しない場合には、他の部品をベアリングユニットに当接させてその軸方向ずれを抑えることが多いが、この方法では、その部品を溶接等により固定する作業が追加となる分、ベアリングユニット組込作業の工数が増え、コストアップになる。   On the other hand, when the stepped shaft is not used, other parts are often brought into contact with the bearing unit to suppress the axial displacement, but this method requires an additional work of fixing the part by welding or the like. As a result, the number of man-hours for assembling the bearing unit increases and the cost increases.

ここまでは、従来のベアリングユニットのうち、内輪が回転軸とともに回転するタイプのものの問題点について述べたが、軸受箱内周にすきまばめの状態で組み込まれた外輪が軸受箱とともに回転するタイプのものにも同様の問題がある。   Up to this point, the problems of the conventional bearing unit in which the inner ring rotates together with the rotating shaft have been described. However, the outer ring incorporated with a clearance fit on the inner periphery of the bearing housing rotates with the bearing housing. There is a similar problem.

本発明の課題は、止めねじを用いない簡単な構造で軸方向ずれやクリープが生じにくいベアリングユニットとその組込方法を提供することである。   An object of the present invention is to provide a bearing unit that has a simple structure that does not use a set screw and that is less likely to cause axial displacement and creep, and a method for assembling the same.

上記の課題を解決するため、本発明は、内輪と外輪の間に複数の転動体を転動自在に配した転がり軸受が軸受箱に組み込まれており、前記内輪がすきまばめの状態で回転軸に組み付けられるベアリングユニットにおいては、内輪の内周側に内周面に歯を有する環状の歯部材を配し、この歯部材を締め付けてその歯を軸に食い込ませることにより、内輪を軸に確実に固定できるようにしたのである。   In order to solve the above-described problems, the present invention includes a rolling bearing in which a plurality of rolling elements are rotatably arranged between an inner ring and an outer ring, and the inner ring rotates with a clearance fit. In the bearing unit assembled on the shaft, an annular tooth member having teeth on the inner peripheral surface is arranged on the inner peripheral side of the inner ring, and this tooth member is tightened to cause the teeth to bite into the shaft, so that the inner ring is used as the shaft. It can be fixed securely.

具体的には、前記内輪を軸方向に延長して、この内輪延長部の外周面に雄ねじ部を設け、この雄ねじ部にねじ結合する環状の締付部材と前記内輪と前記回転軸とに囲まれる位置に、一端部の内周面に歯を有する環状の歯部材を配し、この歯部材の一端部にその端面から軸方向に延びるスリットと外周テーパ面を設けるとともに、前記締付部材または内輪に、前記歯部材の外周テーパ面と係合する内周テーパ面を設け、前記締付部材を内輪延長部にねじ込んでいくことにより、前記歯部材を締付部材および内輪と係合させて、前記歯部材の一端部を縮径させ、前記歯を回転軸に食い込ませるようにした。   Specifically, the inner ring is extended in the axial direction, a male screw portion is provided on the outer peripheral surface of the inner ring extension portion, and is surrounded by an annular tightening member that is screw-coupled to the male screw portion, the inner ring, and the rotating shaft. An annular tooth member having teeth on the inner peripheral surface of one end thereof is provided at a position where a slit extending in the axial direction from the end surface and an outer peripheral taper surface are provided at one end portion of the tooth member; The inner ring is provided with an inner peripheral tapered surface that engages with the outer peripheral tapered surface of the tooth member, and the tightening member is screwed into the inner ring extension portion so that the tooth member is engaged with the tightening member and the inner ring. The one end portion of the tooth member is reduced in diameter so that the tooth bites into the rotating shaft.

また、前記内輪の内周に、内周面に雌ねじ部を有する環状のアタッチメントをしまりばめの状態で嵌め込み、このアタッチメントの雌ねじ部にねじ結合する環状の締付部材と前記アタッチメントと前記回転軸とに囲まれる位置に、一端部の内周面に歯を有する環状の歯部材を配し、この歯部材の一端部にその端面から軸方向に延びるスリットと外周テーパ面を設けるとともに、前記締付部材またはアタッチメントに、前記歯部材の外周テーパ面と係合する内周テーパ面を設け、前記締付部材をアタッチメントにねじ込んでいくことにより、前記歯部材を締付部材およびアタッチメントと係合させて、前記歯部材の一端部を縮径させ、前記歯を回転軸に食い込ませるようにしてもよい。   Further, an annular attachment having an internal thread portion on the inner peripheral surface thereof is fitted into the inner ring of the inner ring in a tight fit state, and an annular tightening member that is screw-coupled to the internal thread portion of the attachment, the attachment, and the rotating shaft An annular tooth member having teeth on the inner peripheral surface of one end portion is disposed at a position surrounded by the end portion, and a slit extending in the axial direction from the end surface and an outer peripheral tapered surface are provided at one end portion of the tooth member, The attachment member or attachment is provided with an inner peripheral tapered surface that engages with the outer peripheral tapered surface of the tooth member, and the fastening member is screwed into the attachment so that the tooth member is engaged with the fastening member and the attachment. Then, one end of the tooth member may be reduced in diameter so that the tooth is bite into the rotating shaft.

そして、上記構成のベアリングユニットの組込方法においては、前記内輪を組み付ける回転軸として、少なくとも前記歯部材の歯が食い込む部位に硬化処理が施されていない軸を用いることにより、歯部材の歯が軸に食い込みやすくなり、内輪をより確実に軸に固定することができる。   In the method of assembling the bearing unit having the above-described configuration, the tooth of the tooth member is formed by using, as a rotating shaft for assembling the inner ring, a shaft that is not subjected to hardening treatment at least at a site where the tooth of the tooth member bites. It becomes easy to bite into the shaft, and the inner ring can be more securely fixed to the shaft.

一方、内輪と外輪の間に複数の転動体を転動自在に配した転がり軸受が軸受箱に組み込まれており、前記軸受箱内周にすきまばめの状態で組み込まれた外輪が軸受箱とともに回転するベアリングユニットにおいては、外輪の外周側に外周面に歯を有する環状の歯部材を配し、この歯部材を拡径してその歯を軸受箱に食い込ませることにより、外輪を軸受箱に確実に固定できるようにしたのである。   On the other hand, a rolling bearing in which a plurality of rolling elements are arranged to freely roll between an inner ring and an outer ring is incorporated in a bearing box, and the outer ring incorporated in a state of clearance fit on the inner periphery of the bearing box together with the bearing box In the rotating bearing unit, an annular tooth member having teeth on the outer peripheral surface is arranged on the outer peripheral side of the outer ring, and the outer ring is inserted into the bearing box by expanding the diameter of the tooth member and causing the teeth to bite into the bearing box. It can be fixed securely.

具体的には、前記外輪を軸方向に延長して、この外輪延長部の内周面に雌ねじ部を設け、この雌ねじ部にねじ結合する環状の締付部材と前記外輪と前記軸受箱とに囲まれる位置に、一端部の外周面に歯を有する環状の歯部材を配し、この歯部材の一端部にその端面から軸方向に延びるスリットと内周テーパ面を設けるとともに、前記締付部材または外輪に、前記歯部材の内周テーパ面と係合する外周テーパ面を設け、前記締付部材を外輪延長部にねじ込んでいくことにより、前記歯部材を締付部材および外輪と係合させて、前記歯部材の一端部を拡径させ、前記歯を軸受箱に食い込ませるようにした。   Specifically, the outer ring is extended in the axial direction, an internal thread portion is provided on the inner peripheral surface of the outer ring extension portion, and an annular tightening member that is screwed to the female thread portion, the outer ring, and the bearing box are provided. An annular tooth member having teeth on the outer peripheral surface of one end portion is arranged at a position surrounded, and a slit extending in the axial direction from the end surface and an inner peripheral tapered surface are provided at one end portion of the tooth member, and the fastening member Alternatively, the outer ring is provided with an outer peripheral taper surface that engages with the inner peripheral taper surface of the tooth member, and the tightening member is screwed into the outer ring extension portion so that the tooth member is engaged with the tightening member and the outer ring. Thus, the diameter of one end of the tooth member is increased so that the tooth is bitten into the bearing box.

また、前記外輪の外周に、外周面に雄ねじ部を有する環状のアタッチメントをしまりばめの状態で嵌め込み、このアタッチメントの雄ねじ部にねじ結合する環状の締付部材と前記アタッチメントと前記軸受箱とに囲まれる位置に、一端部の外周面に歯を有する環状の歯部材を配し、この歯部材の一端部にその端面から軸方向に延びるスリットと内周テーパ面を設けるとともに、前記締付部材またはアタッチメントに、前記歯部材の内周テーパ面と係合する外周テーパ面を設け、前記締付部材をアタッチメントにねじ込んでいくことにより、前記歯部材を締付部材およびアタッチメントと係合させて、前記歯部材の一端部を拡径させ、前記歯を軸受箱に食い込ませるようにすることもできる。   Further, an annular attachment having a male threaded portion on the outer peripheral surface is fitted into the outer periphery of the outer ring with a tight fit, and an annular tightening member that is screw-coupled to the male threaded portion of the attachment, the attachment, and the bearing housing An annular tooth member having teeth on the outer peripheral surface of one end portion is arranged at a position surrounded, and a slit extending in the axial direction from the end surface and an inner peripheral tapered surface are provided at one end portion of the tooth member, and the fastening member Alternatively, the attachment is provided with an outer peripheral tapered surface that engages with the inner peripheral tapered surface of the tooth member, and by screwing the fastening member into the attachment, the tooth member is engaged with the fastening member and the attachment, One end portion of the tooth member may be expanded to allow the teeth to bite into the bearing box.

そして、前記軸受箱を、少なくとも前記歯部材の歯が食い込む部位に硬化処理が施されていないものとすることにより、歯部材の歯が軸受箱に食い込みやすくなり、外輪をより確実に軸受箱に固定することができる。   Then, by making the bearing box not hardened at least at the site where the teeth of the tooth member bite, the teeth of the tooth member can easily bite into the bearing box, and the outer ring is more securely attached to the bearing box. Can be fixed.

本発明は、上述したように、ベアリングユニットの内輪内周側に配した環状の歯部材の歯を軸に食い込ませて、内輪を軸に確実に固定できるようにするか、あるいは外輪外周側に配した環状の歯部材の歯を軸受箱に食い込ませて、外輪を軸受箱に確実に固定できるようにしたので、ベアリングユニットをスラスト荷重が加わる状態で使用しても、その軸方向ずれやクリープを確実に防止することができる。しかも、止めねじを使用しない構造としたので、軸受の変形が少なく長期間安定して使用できる。また、段付軸やその他の軸方向ずれ防止用部品も必要としないので、ベアリングユニットを組み込む装置のコンパクト化が図れるとともに、その組込作業も簡単で手間やコストをかけずに行うことができる。   As described above, according to the present invention, the teeth of the annular tooth member disposed on the inner peripheral side of the inner ring of the bearing unit are bitten into the shaft so that the inner ring can be securely fixed to the shaft, or on the outer peripheral side of the outer ring. Since the teeth of the arranged annular tooth member are bitten into the bearing housing so that the outer ring can be securely fixed to the bearing housing, even if the bearing unit is used in a state where a thrust load is applied, its axial displacement and creep Can be reliably prevented. In addition, since the structure does not use a set screw, the bearing can be used stably with little deformation. In addition, since a stepped shaft and other components for preventing axial displacement are not required, the device incorporating the bearing unit can be made compact, and the assembling work can be performed easily and without cost and cost. .

また、前記歯部材と軸受との間に軸受にしまりばめ状態で嵌め込まれるアタッチメントを介在させることにより、軸受の変形をより少なくして、ベアリングユニットのメンテナンスの手間やコストを減らすことができる。   In addition, by interposing an attachment that is fitted into the bearing in an interference fit between the tooth member and the bearing, the deformation of the bearing can be further reduced, and the labor and cost of maintenance of the bearing unit can be reduced.

さらに、前記軸または軸受箱の歯部材の歯が食い込む部位に、焼入れ等の硬化処理を行わないようにして、歯部材の歯を食い込みやすくすることにより、ベアリングユニットの軸方向ずれやクリープをより効果的に防止することができる。   Furthermore, by avoiding hardening treatment such as quenching in the part where the tooth of the tooth member of the shaft or the bearing box bites, the tooth of the tooth member is made to easily bite, thereby further reducing the axial displacement and creep of the bearing unit. It can be effectively prevented.

以下、図面に基づき、本発明の実施形態を説明する。図１および図２は第１の実施形態を示す。このベアリングユニットは、転がり軸受としての深溝玉軸受１を図示省略した軸受箱の内周に組み込んだもので、玉軸受１と別体の締付部材２および歯部材３を備えている。深溝玉軸受１は、一端側が軸方向に延長された内輪４と、内輪４の外側に配される外輪５と、内外輪４、５間に転動自在に配される複数の転動体としての玉６と、各玉６をほぼ等間隔に保持する保持器７と、内外輪４、５間の空間の両側を塞ぐシール８とで構成され、内輪４がすきまばめの状態で回転軸Ａの外周面に組み付けられるようになっている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment. This bearing unit incorporates a deep groove ball bearing 1 as a rolling bearing on the inner periphery of a bearing box (not shown), and includes a ball bearing 1 and a fastening member 2 and a tooth member 3 that are separate from the ball bearing 1. The deep groove ball bearing 1 includes an inner ring 4 having one end extending in the axial direction, an outer ring 5 disposed outside the inner ring 4, and a plurality of rolling elements disposed between the inner and outer rings 4 and 5 so as to be freely rollable. A ball 6, a cage 7 that holds the balls 6 at substantially equal intervals, and a seal 8 that closes both sides of the space between the inner and outer rings 4 and 5, and the rotation axis A with the inner ring 4 in a loose fit state. It is designed to be assembled to the outer peripheral surface.

前記内輪４の延長部４ａの外周面には雄ねじ部４ｂが設けられており、この内輪延長部４ａの雄ねじ部４ｂに環状の締付部材２がその内周側に形成された雌ねじ部２ａでねじ結合する。そして、締付部材２と内輪４と回転軸Ａとに囲まれる位置に、環状の歯部材３が配されるようになっている。   A male screw portion 4b is provided on the outer peripheral surface of the extension portion 4a of the inner ring 4, and a female screw portion 2a in which an annular fastening member 2 is formed on the inner peripheral side of the male screw portion 4b of the inner ring extension portion 4a. Screw together. An annular tooth member 3 is arranged at a position surrounded by the fastening member 2, the inner ring 4 and the rotation axis A.

前記歯部材３は、図２（ａ）、（ｂ）に示すように、その両端部外周にテーパ面３ａ、３ｂを有するとともに、一端部の内周面に周方向に沿って複数の歯３ｃを有し、一端部の端面から軸方向に切れ込むスリット３ｄが周方向に等間隔で複数設けられている。   As shown in FIGS. 2 (a) and 2 (b), the tooth member 3 has tapered surfaces 3a and 3b on the outer periphery of both ends, and a plurality of teeth 3c along the circumferential direction on the inner peripheral surface of one end. And a plurality of slits 3d cut in the axial direction from the end face of the one end are provided at equal intervals in the circumferential direction.

また、締付部材２の内周の雌ねじ部２ａがない部分に、歯部材３の一端側の外周テーパ面３ａと係合する内周テーパ面２ｂが設けられ、内輪４の延長部４ａには歯部材３の他端側の外周テーパ面３ｂと係合する内周テーパ面４ｃが設けられている。   Further, an inner peripheral tapered surface 2b that engages with the outer peripheral tapered surface 3a on one end side of the tooth member 3 is provided in a portion where the internal thread portion 2a on the inner periphery of the tightening member 2 is not provided. An inner peripheral tapered surface 4c that engages with the outer peripheral tapered surface 3b on the other end side of the tooth member 3 is provided.

一方、前記回転軸Ａとしては、歯部材３の歯３ｃと当接する部位を含む環状の部位を除いて、硬度アップのための焼入れを行ったものを使用している。   On the other hand, as the rotating shaft A, one that has been hardened to increase hardness is used except for an annular portion including a portion that contacts the tooth 3c of the tooth member 3.

そして、締付部材２を内輪延長部４ａにねじ込んでいくと、歯部材３が締付部材２および内輪４とテーパ面どうしで係合し、歯部材３の一端部が縮径して、その歯３ｃが回転軸Ａの焼入れを受けていない部位に食い込むことにより、内輪４が回転軸Ａに固定されるようになっている。   When the tightening member 2 is screwed into the inner ring extension 4a, the tooth member 3 is engaged with the tightening member 2 and the inner ring 4 through the tapered surfaces, and one end of the tooth member 3 is reduced in diameter. The inner ring 4 is fixed to the rotating shaft A by the teeth 3c biting into the part where the rotating shaft A is not quenched.

このベアリングユニットは、上記の構成であり、締付部材２を内輪延長部４ａにねじ込んでいくだけで、簡単かつ確実に内輪４を軸Ａに固定して、軸方向ずれおよびクリープを防止することができる。   This bearing unit has the above-described configuration, and by simply screwing the fastening member 2 into the inner ring extension 4a, the inner ring 4 can be easily and securely fixed to the shaft A to prevent axial displacement and creep. Can do.

なお、歯部材の歯およびスリットは、上述した実施形態と逆に、内輪と係合する側の端部に設けるようにしてもよい。また、実施形態では、歯部材の歯のない側の端部にも外周テーパ面を設け、この外周テーパ面と係合する内周テーパ面を内輪に設けたが、これらのテーパ面は歯部材と内輪とが係合するようになっていれば必ずしも設けなくてもよい。   In addition, you may make it provide the tooth | gear and slit of a tooth | gear member in the edge part of the side engaged with an inner ring | wheel contrary to embodiment mentioned above. Further, in the embodiment, the outer peripheral tapered surface is also provided at the end portion of the tooth member on the side without the teeth, and the inner peripheral tapered surface that engages with the outer peripheral tapered surface is provided in the inner ring. As long as the inner ring and the inner ring are engaged with each other, it is not always necessary.

図３は第２の実施形態を示す。この実施形態では、第１実施形態の内輪４に代えて延長部のない内輪９を用い、この内輪９の内周に環状のアタッチメント１０をしまりばめの状態で嵌め込んでいる。アタッチメント１０は、内周側に雌ねじ部１０ａと歯部材３の他端側の外周テーパ面３ｂと係合する内周テーパ面１０ｂを有している。これに対応して、第１実施形態の締付部材２の代わりに、アタッチメント１０の雌ねじ部１０ａとねじ結合する雄ねじ部１１ａと、歯部材３一端側の外周テーパ面３ａと係合する内周テーパ面１１ｂを有する締付部材１１が用いられる。   FIG. 3 shows a second embodiment. In this embodiment, instead of the inner ring 4 of the first embodiment, an inner ring 9 having no extension is used, and an annular attachment 10 is fitted in an inner periphery of the inner ring 9 in a tight fit state. The attachment 10 has an inner peripheral tapered surface 10b that engages with the female thread portion 10a and the outer peripheral tapered surface 3b on the other end side of the tooth member 3 on the inner peripheral side. Correspondingly, instead of the tightening member 2 of the first embodiment, an internal thread portion 11a that is screw-coupled with the internal thread portion 10a of the attachment 10 and an inner peripheral surface that engages with the outer peripheral tapered surface 3a on one end side of the tooth member 3 A fastening member 11 having a tapered surface 11b is used.

そして、締付部材１１をアタッチメント１０にねじ込んでいくと、歯部材３が締付部材１１およびアタッチメント１０とテーパ面どうしで係合し、歯部材３の一端部が縮径して、その歯３ｃが回転軸Ａに食い込むことにより、アタッチメント１０と内輪９とが一体に回転軸Ａに固定される。   When the tightening member 11 is screwed into the attachment 10, the tooth member 3 engages with the tightening member 11 and the attachment 10 between the taper surfaces, and one end portion of the tooth member 3 is reduced in diameter, and the tooth 3c. Bites into the rotation axis A, whereby the attachment 10 and the inner ring 9 are integrally fixed to the rotation axis A.

この実施形態のベアリングユニットは、内輪９と回転軸Ａとの間にアタッチメント１０を介在させているので、第１実施形態に比べて内輪９の変形が少なく、メンテナンスの手間やコストを減らすことができる。   In the bearing unit of this embodiment, since the attachment 10 is interposed between the inner ring 9 and the rotating shaft A, the deformation of the inner ring 9 is less than that of the first embodiment, and maintenance labor and cost can be reduced. it can.

なお、本発明は、各実施形態のような玉軸受に限らず、ころ軸受や、保持器を有さない総玉軸受あるいは総ころ軸受にももちろん適用できる。   In addition, this invention is naturally applicable not only to a ball bearing like each embodiment but to a roller bearing, a full ball bearing which does not have a cage, or a full roller bearing.

また、上述した各実施形態は内輪を回転軸に組み付ける場合について説明したが、内輪を固定軸に組み付け、軸受箱内周にすきまばめの状態で組み込んだ外輪を軸受箱とともに回転させる場合は、各実施形態で説明した内輪の固定機構を応用して、外輪の外周側に外周面に歯を有する環状の歯部材を配し、この歯部材を拡径してその歯を軸受箱に食い込ませることにより、外輪を軸受箱に固定するようにすればよい。   Moreover, although each embodiment mentioned above demonstrated the case where an inner ring | wheel was assembled | attached to a rotating shaft, when assembling | attaching an inner ring | wheel to a fixed shaft and rotating the outer ring | wheel assembled in the state of clearance fitting to the bearing case inner periphery with a bearing case, By applying the inner ring fixing mechanism described in each embodiment, an annular tooth member having teeth on the outer peripheral surface is arranged on the outer peripheral side of the outer ring, the diameter of the tooth member is expanded, and the teeth are bitten into the bearing box. Thus, the outer ring may be fixed to the bearing housing.

すなわち、図示は省略するが、図１に示した内輪固定機構を応用すれば、外輪を軸方向に延長して、この外輪延長部の内周面に雌ねじ部を設け、この雌ねじ部にねじ結合する環状の締付部材と外輪と軸受箱とに囲まれる位置に、一端部の外周面に歯を有する環状の歯部材を配し、この歯部材の一端部にその端面から軸方向に延びるスリットと内周テーパ面を設けるとともに、締付部材に歯部材の内周テーパ面と係合する外周テーパ面を設け、締付部材を外輪延長部にねじ込んでいくことにより、歯部材を締付部材および外輪と係合させて、歯部材の一端部を拡径させ、前記歯を軸受箱に食い込ませればよい。   That is, although illustration is omitted, if the inner ring fixing mechanism shown in FIG. 1 is applied, the outer ring is extended in the axial direction, and an internal thread portion is provided on the inner peripheral surface of the outer ring extension portion. An annular tooth member having teeth on the outer peripheral surface of one end is disposed at a position surrounded by the annular tightening member, the outer ring, and the bearing housing, and a slit extending in the axial direction from the end surface to the one end of the tooth member And the inner peripheral tapered surface, and the tightening member is provided with an outer peripheral tapered surface that engages with the inner peripheral tapered surface of the tooth member, and by screwing the tightening member into the outer ring extension, the tooth member is tightened. Further, the tooth member may be engaged with the outer ring to enlarge the diameter of one end of the tooth member, and the tooth may be bitten into the bearing box.

また、図３に示したアタッチメントを用いる機構を応用して、外輪の外周に、外周面に雄ねじ部を有する環状のアタッチメントをしまりばめの状態で嵌め込み、このアタッチメントの雄ねじ部にねじ結合する環状の締付部材とアタッチメントと軸受箱とに囲まれる位置に、一端部の外周面に歯を有する環状の歯部材を配し、この歯部材の一端部にその端面から軸方向に延びるスリットと内周テーパ面を設けるとともに、締付部材に歯部材の内周テーパ面と係合する外周テーパ面を設け、締付部材をアタッチメントにねじ込んでいくことにより、歯部材を締付部材およびアタッチメントと係合させて、歯部材の一端部を拡径させ、歯を軸受箱に食い込ませるようにすることもできる。   Further, by applying the mechanism using the attachment shown in FIG. 3, an annular attachment having a male screw portion on the outer peripheral surface is fitted into the outer periphery of the outer ring in a tight fit state, and the ring is connected to the male screw portion of the attachment by screw connection. An annular tooth member having teeth on the outer peripheral surface of one end portion is arranged at a position surrounded by the fastening member, attachment, and bearing housing, and a slit extending in the axial direction from the end surface is disposed at one end portion of the tooth member. In addition to providing a circumferential taper surface, the tightening member is provided with an outer peripheral taper surface that engages with the inner peripheral taper surface of the tooth member, and by screwing the tightening member into the attachment, the tooth member is engaged with the tightening member and the attachment. It is possible to increase the diameter of one end portion of the tooth member so that the teeth are bitten into the bearing housing.

そして、このように外輪を軸受箱に固定する場合は、歯部材の歯が軸受箱に食い込みやすくなるように、少なくとも歯部材の歯が食い込む部位に焼入れ等の硬化処理が施されていない軸受箱を用いるとよい。   And when fixing an outer ring to a bearing box in this way, a bearing box in which hardening processing such as quenching is not applied to at least a portion where the teeth of the tooth member bite into the bearing box makes it easy for the tooth of the tooth member to bite into the bearing box. Should be used.

第１実施形態のベアリングユニットの要部の正面断面図Front sectional drawing of the principal part of the bearing unit of 1st Embodiment ａ、ｂは、それぞれ図１の歯部材の外観斜視図および正面断面図a and b are an external perspective view and a front sectional view of the tooth member of FIG. 第２実施形態のベアリングユニットの要部の正面断面図Front sectional drawing of the principal part of the bearing unit of 2nd Embodiment

符号の説明Explanation of symbols

１ 玉軸受
２ 締付部材
２ａ 雌ねじ部
２ｂ 内周テーパ面
３ 歯部材
３ａ、３ｂ 外周テーパ面
３ｃ 歯
３ｄ スリット
４ 内輪
４ａ 延長部
４ｂ 雄ねじ部
４ｃ 内周テーパ面
５ 外輪
９ 内輪
１０ アタッチメント
１０ａ 雌ねじ部
１０ｂ 内周テーパ面
１１ 締付部材
１１ａ 雄ねじ部
１１ｂ 内周テーパ面
Ａ 軸 DESCRIPTION OF SYMBOLS 1 Ball bearing 2 Tightening member 2a Female thread part 2b Inner circumference taper surface 3 Tooth member 3a, 3b Outer taper surface 3c Tooth 3d Slit 4 Inner ring 4a Extension part 4b Male thread part 4c Inner circumference taper surface 5 Outer ring 9 Inner ring 10 Attachment 10a Female thread part 10b Inner circumference taper surface 11 Tightening member 11a Male thread portion 11b Inner circumference taper surface A axis

Claims (6)

内輪と外輪の間に複数の転動体を転動自在に配した転がり軸受が軸受箱に組み込まれており、前記内輪がすきまばめの状態で回転軸に組み付けられるベアリングユニットにおいて、前記内輪を軸方向に延長して、この内輪延長部の外周面に雄ねじ部を設け、この雄ねじ部にねじ結合する環状の締付部材と前記内輪と前記回転軸とに囲まれる位置に、一端部の内周面に歯を有する環状の歯部材を配し、この歯部材の一端部にその端面から軸方向に延びるスリットと外周テーパ面を設けるとともに、前記締付部材または内輪に、前記歯部材の外周テーパ面と係合する内周テーパ面を設け、前記締付部材を内輪延長部にねじ込んでいくことにより、前記歯部材を締付部材および内輪と係合させて、前記歯部材の一端部を縮径させ、前記歯を回転軸に食い込ませるようにしたことを特徴とするベアリングユニット。   A rolling bearing in which a plurality of rolling elements are rotatably arranged between an inner ring and an outer ring is incorporated in a bearing housing, and in the bearing unit in which the inner ring is assembled to a rotating shaft in a state of clearance fit, the inner ring is The inner ring extension portion is provided with a male screw portion on the outer peripheral surface of the inner ring extension portion, and the inner circumference of the one end portion is positioned at a position surrounded by the annular tightening member screwed to the male screw portion, the inner ring and the rotating shaft. An annular tooth member having teeth on the surface is arranged, and a slit and an outer peripheral taper surface extending in the axial direction from the end surface are provided at one end of the tooth member, and the outer peripheral taper of the tooth member is provided on the tightening member or the inner ring. An inner peripheral tapered surface that engages with the surface is provided, and the tightening member is screwed into the inner ring extension portion, whereby the tooth member is engaged with the tightening member and the inner ring, and one end portion of the tooth member is contracted. Diameter, and the teeth on the axis of rotation Bearing unit being characterized in that so as to incorporated are. 内輪と外輪の間に複数の転動体を転動自在に配した転がり軸受が軸受箱に組み込まれており、前記内輪がすきまばめの状態で回転軸に組み付けられるベアリングユニットにおいて、前記内輪の内周に、内周面に雌ねじ部を有する環状のアタッチメントをしまりばめの状態で嵌め込み、このアタッチメントの雌ねじ部にねじ結合する環状の締付部材と前記アタッチメントと前記回転軸とに囲まれる位置に、一端部の内周面に歯を有する環状の歯部材を配し、この歯部材の一端部にその端面から軸方向に延びるスリットと外周テーパ面を設けるとともに、前記締付部材またはアタッチメントに、前記歯部材の外周テーパ面と係合する内周テーパ面を設け、前記締付部材をアタッチメントにねじ込んでいくことにより、前記歯部材を締付部材およびアタッチメントと係合させて、前記歯部材の一端部を縮径させ、前記歯を回転軸に食い込ませるようにしたことを特徴とするベアリングユニット。   In a bearing unit in which a rolling bearing in which a plurality of rolling elements are rotatably arranged between an inner ring and an outer ring is incorporated in a bearing housing, and the inner ring is assembled to a rotating shaft in a state of clearance fit, an inner ring of the inner ring is provided. An annular attachment having a female threaded portion on the inner peripheral surface is fitted in the periphery with a tight fit. An annular tooth member having teeth on the inner peripheral surface of one end portion is provided, and a slit and an outer peripheral taper surface extending in the axial direction from the end surface are provided on one end portion of the tooth member, and the fastening member or attachment is provided with: An inner peripheral tapered surface that engages with an outer peripheral tapered surface of the tooth member is provided, and the tightening member is screwed into an attachment, whereby the tooth member is It is engaged Attachment and engagement, the bearing unit, characterized in that the one end of the tooth member reduced in diameter and was set to bite into the teeth on the rotating shaft. 請求項１または２に記載のベアリングユニットの組込方法において、前記内輪を組み付ける回転軸として、少なくとも前記歯部材の歯が食い込む部位に硬化処理が施されていない軸を用いるようにしたことを特徴とするベアリングユニットの組込方法。   3. The method of assembling a bearing unit according to claim 1 or 2, wherein a shaft that is not subjected to hardening treatment is used as a rotating shaft for assembling the inner ring at least at a site where teeth of the tooth member bite. Assembling method of bearing unit. 内輪と外輪の間に複数の転動体を転動自在に配した転がり軸受が軸受箱に組み込まれており、前記軸受箱内周にすきまばめの状態で組み込まれた外輪が軸受箱とともに回転するベアリングユニットにおいて、前記外輪を軸方向に延長して、この外輪延長部の内周面に雌ねじ部を設け、この雌ねじ部にねじ結合する環状の締付部材と前記外輪と前記軸受箱とに囲まれる位置に、一端部の外周面に歯を有する環状の歯部材を配し、この歯部材の一端部にその端面から軸方向に延びるスリットと内周テーパ面を設けるとともに、前記締付部材または外輪に、前記歯部材の内周テーパ面と係合する外周テーパ面を設け、前記締付部材を外輪延長部にねじ込んでいくことにより、前記歯部材を締付部材および外輪と係合させて、前記歯部材の一端部を拡径させ、前記歯を軸受箱に食い込ませるようにしたことを特徴とするベアリングユニット。   A rolling bearing in which a plurality of rolling elements are arranged to freely roll between an inner ring and an outer ring is incorporated in the bearing housing, and the outer ring incorporated in a state of clearance fit on the inner periphery of the bearing housing rotates together with the bearing housing. In the bearing unit, the outer ring is extended in the axial direction, and an internal thread portion is provided on an inner peripheral surface of the outer ring extension portion, and is surrounded by an annular tightening member that is screw-coupled to the internal thread portion, the outer ring, and the bearing box. An annular tooth member having teeth on the outer peripheral surface of one end thereof is provided at a position where the slit and an inner peripheral taper surface extending in the axial direction from the end surface are provided at one end portion of the tooth member; The outer ring is provided with an outer peripheral taper surface that engages with the inner peripheral taper surface of the tooth member, and the tightening member is screwed into the outer ring extension to engage the tooth member with the tightening member and the outer ring. , Expand one end of the tooth member Is allowed, the bearing unit being characterized in that so as to bite into the tooth bearing housing. 内輪と外輪の間に複数の転動体を転動自在に配した転がり軸受が軸受箱に組み込まれており、前記軸受箱内周にすきまばめの状態で組み込まれた外輪が軸受箱とともに回転するベアリングユニットにおいて、前記外輪の外周に、外周面に雄ねじ部を有する環状のアタッチメントをしまりばめの状態で嵌め込み、このアタッチメントの雄ねじ部にねじ結合する環状の締付部材と前記アタッチメントと前記軸受箱とに囲まれる位置に、一端部の外周面に歯を有する環状の歯部材を配し、この歯部材の一端部にその端面から軸方向に延びるスリットと内周テーパ面を設けるとともに、前記締付部材またはアタッチメントに、前記歯部材の内周テーパ面と係合する外周テーパ面を設け、前記締付部材をアタッチメントにねじ込んでいくことにより、前記歯部材を締付部材およびアタッチメントと係合させて、前記歯部材の一端部を拡径させ、前記歯を軸受箱に食い込ませるようにしたことを特徴とするベアリングユニット。   A rolling bearing in which a plurality of rolling elements are arranged to freely roll between an inner ring and an outer ring is incorporated in the bearing housing, and the outer ring incorporated in a state of clearance fit on the inner periphery of the bearing housing rotates together with the bearing housing. In the bearing unit, an annular attachment member having a male threaded portion on the outer circumferential surface of the outer ring is fitted with a tight fit, and an annular tightening member that is screwed to the male threaded portion of the attachment, the attachment, and the bearing box An annular tooth member having teeth on the outer peripheral surface of one end portion is disposed at a position surrounded by the outer peripheral surface, and a slit extending in the axial direction from the end surface and an inner peripheral tapered surface are provided at one end portion of the tooth member. The attachment member or attachment is provided with an outer peripheral taper surface that engages with the inner peripheral taper surface of the tooth member, and the fastening member is screwed into the attachment to Tooth member into engagement with the clamping member and the attachment, said to enlarged one end portion of the gear member, a bearing unit, characterized in that so as to bite into the tooth bearing housing. 前記軸受箱を、少なくとも前記歯部材の歯が食い込む部位に硬化処理が施されていないものとしたことを特徴とする請求項４または５に記載のベアリングユニット。   6. The bearing unit according to claim 4, wherein the bearing box is not subjected to a hardening process at least at a portion where the teeth of the tooth member bite.
JP2007312517A 2007-12-03 2007-12-03 Bearing unit and its incorporation method Pending JP2009138765A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014043911A (en) * 2012-08-27 2014-03-13 Nsk Ltd Rolling bearing
CN106321644A (en) * 2015-11-03 2017-01-11 无锡市三立轴承有限公司 Integrated bearing inner ring structure
CN106369044A (en) * 2016-12-09 2017-02-01 瓦房店轴承集团有限责任公司 Special-shape-structure rotor bearing
WO2018017030A1 (en) * 2016-07-20 2018-01-25 Ortadogu Rulman Sanayi Ve Ticaret Anonim Sirketi Fixing of a ball bearing on a shaft with interposition of a conical sleeve
CN110671427A (en) * 2019-10-09 2020-01-10 南京荧河谷科技有限公司 Bearing capable of offsetting shape tolerance of shaft neck

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014043911A (en) * 2012-08-27 2014-03-13 Nsk Ltd Rolling bearing
CN106321644A (en) * 2015-11-03 2017-01-11 无锡市三立轴承有限公司 Integrated bearing inner ring structure
WO2018017030A1 (en) * 2016-07-20 2018-01-25 Ortadogu Rulman Sanayi Ve Ticaret Anonim Sirketi Fixing of a ball bearing on a shaft with interposition of a conical sleeve
CN106369044A (en) * 2016-12-09 2017-02-01 瓦房店轴承集团有限责任公司 Special-shape-structure rotor bearing
CN110671427A (en) * 2019-10-09 2020-01-10 南京荧河谷科技有限公司 Bearing capable of offsetting shape tolerance of shaft neck

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