JP2012057722A - Self-aligning roller bearing - Google Patents

Self-aligning roller bearing Download PDF

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Publication number
JP2012057722A
JP2012057722A JP2010201730A JP2010201730A JP2012057722A JP 2012057722 A JP2012057722 A JP 2012057722A JP 2010201730 A JP2010201730 A JP 2010201730A JP 2010201730 A JP2010201730 A JP 2010201730A JP 2012057722 A JP2012057722 A JP 2012057722A
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Japan
Prior art keywords
outer ring
chamfer
self
diameter surface
roller bearing
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JP2010201730A
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Japanese (ja)
Inventor
Shogo Tabata
翔悟 田畑
Yosuke Oya
洋右 大矢
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2010201730A priority Critical patent/JP2012057722A/en
Publication of JP2012057722A publication Critical patent/JP2012057722A/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
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • 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
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/06—Ball or roller bearings
    • F16C23/08—Ball or roller bearings self-adjusting
    • F16C23/082—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface
    • F16C23/086—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface forming a track for rolling elements

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

Abstract

PROBLEM TO BE SOLVED: To enlarge as much as possible the axial dimension of a chamfer on at least one end side of an outer ring while ensuring the fit between the outer ring of a self-aligning roller bearing and a housing in a load area.SOLUTION: The connection line E between the outer diameter surface 12 of the outer ring 1 and the chamfer 15 is placed on an extension of the line of action at the maximum contact angle θ2 in a row on the chamfer 15 side. The outer diameter surface 12 of the outer ring 1 is formed up to an extension where a line of action of a resultant force of forces transferred to barrel-shaped rollers 3a by the outer ring 1 is tilted closest to the chamfer 15 side, and the axial dimension of the chamfer 15 is enlarged as much as possible. The line of action of the resultant force passes through the area where the fit between the outer ring 1 and housing 5 is secured without a gap even when the barrel-shaped rollers 3a have any value of the contact angle due to the self-aligning property in the row on the side where the chamfer 15 is made.

Description

この発明は、自動調心ころ軸受に関する。   The present invention relates to a self-aligning roller bearing.

自動調心ころ軸受は、工場出荷の段階で組み立てられており、また、調心性を有することから、使用現場での取り扱いが容易であり、多くの産業分野で使用されている。自動調心ころ軸受の組み込みにおいては、球面軌道を有する外輪の外径面がハウジングに嵌合され、２列１対の軌道を有する内輪が軸に嵌合される。   Spherical roller bearings are assembled at the factory shipment stage, and have self-aligning properties, so that they are easy to handle on the site of use and are used in many industrial fields. In the incorporation of the self-aligning roller bearing, the outer diameter surface of the outer ring having a spherical raceway is fitted to the housing, and the inner ring having two rows and one pair of raceways is fitted to the shaft.

自動調心ころ軸受は、他の転がり軸受と同様に、その外輪の外径面と各端面とをつなぐ面取りが施されている。この面取りは、旋削でＲ状に形成される。その後に、図２に示すように、外輪の外径面が円筒状に研削されている（例えば、特許文献１）。   As with other rolling bearings, the self-aligning roller bearing is chamfered to connect the outer diameter surface of the outer ring to each end surface. This chamfer is formed in an R shape by turning. Thereafter, as shown in FIG. 2, the outer diameter surface of the outer ring is ground into a cylindrical shape (for example, Patent Document 1).

特開２００２−３４９５８５号公報JP 2002-349585 A

しかしながら、上述のように面取りを形成すると、外輪の外径面とＲ状の面取りとの繋ぎ目がエッジになる。このような繋ぎ目は、外輪をハウジングに嵌合する作業中に、引っ掛かる原因となる。この引っ掛かりを防止するには、面取りを小さな曲率で施せば、繋ぎ目が滑らかになる。   However, when the chamfer is formed as described above, the joint between the outer diameter surface of the outer ring and the R-shaped chamfer becomes an edge. Such a joint becomes a cause of being caught during the operation of fitting the outer ring to the housing. In order to prevent this catch, if the chamfering is performed with a small curvature, the joint becomes smooth.

また、図３に示すように、面取りを単純なＲ状にするのではなく、外輪の端面３１にＲ状部３２をつなぎ、そのＲ状部３２と外径面３３とを円錐部３４でつなぐように施せば、繋ぎ目が滑らかになる。これには、円錐部３４の円錐角を小さくする程よいが、面取りの軸方向寸法が大きくなる。   Further, as shown in FIG. 3, the chamfering is not made into a simple R shape, but an R-shaped portion 32 is connected to the end surface 31 of the outer ring, and the R-shaped portion 32 and the outer diameter surface 33 are connected by a conical portion 34. If applied in this way, the joints become smooth. For this purpose, it is better to reduce the cone angle of the cone portion 34, but the axial dimension of the chamfer becomes larger.

上述のように、面取りの軸方向寸法が大きくなることを許容すれば、外輪の嵌合時にハウジングに引っ掛かり難くすることができる。
ところが、調心性を有し、玉軸受より大きな荷重を支持する用途に利用される自動調心ころ軸受においては、大きな荷重を受けるたる形ころが外輪の球面軌道との間に許容調心角の範囲内で滑りを生じながら転動する。このため、自動調心ころ軸受の外輪に軸方向寸法が大きな面取りを施すと、負荷域において外輪とハウジングとの嵌合がしっかりせず、負荷支持の支障になる恐れがある。 As described above, if the axial dimension of the chamfer is allowed to increase, it is possible to make it difficult to be caught in the housing when the outer ring is fitted.
However, in a self-aligning roller bearing that is self-aligning and is used for applications that support a larger load than a ball bearing, an allowable aligning angle between a spherical roller that receives a large load and the spherical raceway of the outer ring is present. Roll while slipping within the range. For this reason, if the outer ring of the self-aligning roller bearing is chamfered with a large axial dimension, the outer ring and the housing are not securely fitted in the load region, which may hinder load support.

そこで、この発明の課題は、自動調心ころ軸受の外輪とハウジングとの嵌合を負荷域において確実にしながら、外輪の少なくとも一端側の面取りの軸方向寸法を可及的に大きくすることにある。   Accordingly, an object of the present invention is to increase the axial dimension of the chamfer on at least one end side of the outer ring as much as possible while ensuring the fitting between the outer ring and the housing of the self-aligning roller bearing in the load region. .

上記の課題を達成するため、この発明は、球面軌道を有する外輪と、２列１対の軌道を有する内輪とを備え、前記外輪の外径面と端面とをつなぐ面取りが施されている自動調心ころ軸受において、前記外輪の外径面と前記面取りとの繋ぎ目が、当該面取り側の列の最大接触角における作用線の延長上にあることを特徴とするものである。
ここで、「接触角」は、軸受中心軸に垂直な平面と、外輪によってたる形ころへ伝えられる力の合力の作用線とがなす角度のことである。
「最大接触角」は、たる形ころが許容調心角の限界位置にあるときの接触角のことである。 In order to achieve the above object, the present invention is an automatic motor comprising an outer ring having a spherical raceway and an inner ring having a pair of raceways in two rows, and is chamfered to connect an outer diameter surface and an end face of the outer ring. In the spherical roller bearing, the joint between the outer diameter surface of the outer ring and the chamfer is on an extension of the action line at the maximum contact angle of the row on the chamfer side.
Here, the “contact angle” is an angle formed by a plane perpendicular to the center axis of the bearing and a line of action of the resultant force transmitted to the barrel roller by the outer ring.
The “maximum contact angle” is a contact angle when the tapered roller is at the limit position of the allowable alignment angle.

この発明は、外輪の外径面の一端と、少なくとも一端側の面取りとの間の繋ぎ目に適用される。外輪一端側からハウジングへの嵌合が行なわれるため、少なくとも一端側で外輪の外径面と面取りとの繋ぎ目を滑らかにすれば、その側から嵌合することで引っ掛かりを防止することができる。   The present invention is applied to a joint between one end of the outer diameter surface of the outer ring and a chamfer on at least one end side. Since fitting to the housing is performed from one end side of the outer ring, if the joint between the outer diameter surface of the outer ring and the chamfer is smoothed at least at one end side, it is possible to prevent catching by fitting from that side. .

前記外輪の外径面と前記面取りとの繋ぎ目が、当該面取り側の列の最大接触角における作用線の延長上にある構成によれば、外輪によってたる形ころへ伝えられる力の合力の作用線が最も当該面取り側に傾いたときの延長上まで外輪の外径面が形成され、当該面取りの軸方向寸法が可及的に大きくなる。
可及的に大きな面取りを施した側の列において、たる形ころが調心性によりどのような接触角になろうとも、外輪によってたる形ころへ伝えられる力の合力の作用線は、外輪の外径面と交わる、すなわち、外輪とハウジングとの嵌合が隙間なく確保される領域を通る。したがって、自動調心ころ軸受の外輪とハウジングとの嵌合を負荷域において確実にすることができる。 According to the configuration in which the joint between the outer diameter surface of the outer ring and the chamfer is on the extension of the action line at the maximum contact angle of the row on the chamfered side, the action of the resultant force transmitted to the barrel roller by the outer ring The outer diameter surface of the outer ring is formed up to the extension when the line is most inclined to the chamfer side, and the axial dimension of the chamfer becomes as large as possible.
In the row on the side where chamfering is as large as possible, no matter what contact angle the barrel roller has due to alignment, the acting line of the resultant force transmitted by the outer ring to the barrel roller is Crosses the radial surface, that is, passes through a region where the fitting between the outer ring and the housing is ensured without a gap. Therefore, the engagement between the outer ring of the self-aligning roller bearing and the housing can be ensured in the load region.

したがって、この発明は、上記構成の採用により、自動調心ころ軸受の外輪とハウジングとの嵌合を負荷域において確実にしながら、外輪の少なくとも一端側の面取りの軸方向寸法を可及的に大きくすることができる。
Therefore, according to the present invention, by adopting the above configuration, the axial dimension of the chamfer on at least one end side of the outer ring is made as large as possible while ensuring the fitting between the outer ring of the self-aligning roller bearing and the housing in the load region. can do.


ａは実施形態に係る自動調心ころ軸受の全体構成を示す縦断面図、ｂはａの一端側の面取り部分の拡大図a is a longitudinal sectional view showing the entire configuration of the self-aligning roller bearing according to the embodiment, and b is an enlarged view of a chamfered portion on one end side of a. 従来の外輪の外径面の加工を示す模式図Schematic diagram showing the processing of the outer diameter surface of a conventional outer ring 外輪の面取り形状の一例を示す模式図Schematic diagram showing an example of the chamfered shape of the outer ring

以下、この発明の実施形態に係る自動調心ころ軸受を添付図面に基づいて説明する。
図１（ａ）に示すように、この自動調心ころ軸受は、球面軌道１１を有する外輪１と、２列１対の内輪軌道２１、２２を有する内輪２と、球面軌道１１と一方の列の内輪軌道２１との間に介在する複数のたる形ころ３ａと、球面軌道１１と他方の列の内輪軌道２２との間に介在する複数のたる形ころ３ｂと、複数のたる形ころ３ａを周方向に等配する保持器４ａと、複数のたる形ころ３ｂを周方向に等配する保持器４ｂとを備えている。 Hereinafter, a self-aligning roller bearing according to an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1A, this spherical roller bearing includes an outer ring 1 having a spherical raceway 11, an inner ring 2 having two pairs of inner ring raceways 21 and 22, a spherical raceway 11 and one row. A plurality of barrel rollers 3 a interposed between the inner ring raceway 21, a plurality of barrel rollers 3 b interposed between the spherical raceway 11 and the inner ring raceway 22 in the other row, and a plurality of barrel rollers 3 a. A cage 4a that is equally distributed in the circumferential direction and a cage 4b that equally distributes the plurality of barrel rollers 3b in the circumferential direction are provided.

外輪１の外径面１２は、円筒状とされている。外輪１の各端面１３、１４は、軸受中心軸に垂直又は実質的に垂直な幅面になっている。外輪１の外径面１２と各端面１３、１４とをつなぐ面取り１５、１６がＲ状に施されている。   The outer diameter surface 12 of the outer ring 1 is cylindrical. Each end face 13, 14 of the outer ring 1 is a width face that is perpendicular or substantially perpendicular to the bearing central axis. Chamfers 15 and 16 connecting the outer diameter surface 12 of the outer ring 1 and the end surfaces 13 and 14 are formed in an R shape.

各列のたる形ころ３ａ、３ｂは、球面軌道１１及び内輪軌道２１、２２に対する滑りが内輪２のつば２３ａ、２３ｂ、中つば２３ｃで規制される。なお、中つば２３ｃに代えて、案内輪、保持器による規制を採用することもできる。上述の規制により、各列のたる形ころ３ａ、３ｂは、設計上の正規のアライメントにおける接触角θ１を中心として、許容調心角が正負両側に設定されている。
接触角θ１は、軸受中心を通り、軸受中心軸に垂直な平面Ｒｓを基準としている。
許容調心角は、例えば、０．５°〜２°に設定されることが多いが、この範囲に限定されない。 In each of the cylindrical rollers 3a and 3b in the respective rows, the sliding with respect to the spherical raceway 11 and the inner ring raceways 21 and 22 is restricted by the collars 23a and 23b and the middle collar 23c of the inner ring 2. In place of the middle collar 23c, regulation by a guide wheel or a cage can be adopted. Due to the above-described regulations, the allowable alignment angles are set on both the positive and negative sides of the tapered rollers 3a and 3b in each row centering on the contact angle θ1 in normal design alignment.
The contact angle θ1 is based on a plane Rs that passes through the bearing center and is perpendicular to the bearing center axis.
The allowable alignment angle is often set to, for example, 0.5 ° to 2 °, but is not limited to this range.

図１（ａ）（ｂ）に示すように、外輪１の外径面１２と一端側の面取り１５との繋ぎ目Ｅが、当該面取り１５側の列のたる形ころ３ａの最大接触角θ２における作用線の延長上にある。これにより、外輪１によってたる形ころ３ａへ伝えられる力の合力の作用線が最も当該面取り１５側に傾いたときの延長上まで外輪１の外径面１２が形成され、面取り１５の軸方向寸法は、可及的に大きくなっている。
たる形ころ３ａが最大接触角θ２からθ１側に変位したとしても、外輪１によってたる形ころ３ａへ伝えられる力の合力の作用線は、外輪１の外径面１２と交わる。すなわち、外輪１とハウジング５との嵌合が隙間なく確保される領域を通る。したがって、自動調心ころ軸受の外輪１とハウジング５との嵌合を負荷域において確実にすることができる。 As shown in FIGS. 1A and 1B, the joint E between the outer diameter surface 12 of the outer ring 1 and the chamfer 15 on one end side is at the maximum contact angle θ2 of the cylindrical rollers 3a in the row on the chamfer 15 side. It is on the extension of the line of action. Thereby, the outer diameter surface 12 of the outer ring 1 is formed up to the extension when the line of action of the resultant force transmitted by the outer ring 1 to the barrel roller 3a is inclined most toward the chamfer 15 side. Is as large as possible.
Even if the barrel roller 3 a is displaced from the maximum contact angle θ 2 to the θ 1 side, the action line of the resultant force transmitted to the barrel roller 3 a by the outer ring 1 intersects with the outer diameter surface 12 of the outer ring 1. That is, the outer ring 1 and the housing 5 pass through a region where the fitting is ensured without a gap. Therefore, the fitting between the outer ring 1 of the self-aligning roller bearing and the housing 5 can be ensured in the load region.

また、一端側の面取り１５は、その軸方向寸法が可及的に大きく取れる分、曲率半径が可及的に大きくなっている。その結果、外輪１の外径面１２の一端との繋ぎ目Ｅの近傍における曲率が可及的に小さくなっており、繋ぎ目Ｅが滑らかになっている。したがって、外輪１の一端側から嵌合すれば、ハウジング５に引っ掛かり難くい。   Further, the chamfer 15 on one end side has a radius of curvature as large as possible because the dimension in the axial direction is as large as possible. As a result, the curvature in the vicinity of the joint E with one end of the outer diameter surface 12 of the outer ring 1 is as small as possible, and the joint E is smooth. Therefore, if fitted from one end side of the outer ring 1, it is difficult to be caught on the housing 5.

この実施形態では、一端側の面取りのみを可及的に大きな軸方向寸法としたが、他端側の面取りにおいても同様にすれば、いずれの面取り側から嵌合しても引っ掛かり難くなる。
また、この実施形態では、一端側の面取りをＲ状に施したが、図３に示したように、一端側の面取りを、端面にＲ状部をつなぎ、そのＲ状部と外径面とを円錐部でつなぐように施したり、対数クラウニング形状にすることもできる。 In this embodiment, only the chamfer on one end side is made as large as possible in the axial direction. However, if the same is applied to the chamfer on the other end side, it will be difficult to catch even if fitted from either chamfer side.
Further, in this embodiment, the chamfering on one end side is formed in an R shape, but as shown in FIG. 3, the chamfering on one end side is connected to the R shape portion on the end surface, and the R shape portion and the outer diameter surface are connected. Can be applied so as to be connected by a conical portion, or a logarithmic crowning shape can be formed.

１ 外輪
２ 内輪
３ａ、３ｂ たる形ころ
４ａ、４ｂ 保持器
５ ハウジング
１１ 球面軌道
１２ 外径面
１３、１４ 端面
１５、１６ 面取り
２１、２２ 内輪軌道
Ｅ 繋ぎ目
θ１ 接触角
θ２ 最大接触角 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3a, 3b Tapered roller 4a, 4b Cage 5 Housing 11 Spherical track 12 Outer diameter surface 13, 14 End surface 15, 16 Chamfer 21, 22 Inner ring track E Joint θ1 Contact angle θ2 Maximum contact angle

Claims (1)

球面軌道を有する外輪と、２列１対の軌道を有する内輪とを備え、前記外輪の外径面と各端面とをつなぐ面取りが施されている自動調心ころ軸受において、
前記外輪の外径面と前記面取りとの繋ぎ目が、当該面取り側の列の最大接触角における作用線の延長上にあることを特徴とする自動調心ころ軸受。 In a self-aligning roller bearing comprising an outer ring having a spherical raceway and an inner ring having two rows and one pair of raceways, and chamfering is performed to connect the outer diameter surface of the outer ring and each end face.
A self-aligning roller bearing, wherein a joint between the outer diameter surface of the outer ring and the chamfer is on an extension of a line of action at the maximum contact angle of the chamfered row.
JP2010201730A 2010-09-09 2010-09-09 Self-aligning roller bearing Pending JP2012057722A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019022161A1 (en) * 2017-07-28 2019-01-31 Ntn株式会社 Double-row self-aligning roller bearing

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019022161A1 (en) * 2017-07-28 2019-01-31 Ntn株式会社 Double-row self-aligning roller bearing
JP2019027498A (en) * 2017-07-28 2019-02-21 Ntn株式会社 Multi-line self-aligning roller bearing
CN110945256A (en) * 2017-07-28 2020-03-31 Ntn株式会社 Double-row automatic aligning roller bearing
CN110945256B (en) * 2017-07-28 2021-08-10 Ntn株式会社 Double-row automatic aligning roller bearing
US11187266B2 (en) 2017-07-28 2021-11-30 Ntn Corporation Double-row self-aligning roller bearing

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