JP2018119580A

JP2018119580A - Creep preventive rolling bearing

Info

Publication number: JP2018119580A
Application number: JP2017010362A
Authority: JP
Inventors: 貴則石川; Takanori Ishikawa
Original assignee: NTN Corp; NTN Toyo Bearing Co Ltd
Current assignee: NTN Corp
Priority date: 2017-01-24
Filing date: 2017-01-24
Publication date: 2018-08-02

Abstract

PROBLEM TO BE SOLVED: To provide a creep preventive rolling bearing capable of surely preventing creeping of a rolling bearing, reducing the number of components of the rolling bearing and man-hours for assembly to make its structure simple, further enhancing lubricity, and suitably smoothening rotation of the rolling bearing.SOLUTION: A deep groove ball bearing includes: an outer ring 1 fitted into a fitting surface of a housing at an interval and receiving stationary load; an inner ring 2 holding a rotational shaft; and a rolling body comprising a plurality of balls rollably held between an outer peripheral surface of the inner ring 2 and an inner peripheral surface of the outer ring 1 in a state of being held by a holder 3. On the outer peripheral surface 1a of the outer ring 1, a plurality of grooves 5 extending in an axis direction is arranged at an equal interval, a protrusion part 6 projecting to a radial outside of the outer ring 1 is provided at an edge of the groove 5 on the outer peripheral surface 1a side, and the protrusion part is pressure-welded to the housing.SELECTED DRAWING: Figure 2

Description

この発明は、クリープ防止転がり軸受に関するものである。 The present invention relates to an anti-creep rolling bearing.

一般に、自動車用トランスミッションのシャフト等を支持する深溝玉軸受のような非分離型の転がり軸受は、着脱作業や調整作業が可能であるように、外輪がハウジングの嵌め合い面に隙間嵌めによって固定されている。 In general, in non-separable type rolling bearings such as deep groove ball bearings that support shafts of automobile transmissions, the outer ring is fixed to the mating surface of the housing by a clearance fit so that it can be attached and detached and adjusted. ing.

近年、自動車用トランスミッションのシャフトの回転が、電気自動車やハイブリッド自動車におけるモータで高速化する傾向があり、回転軸を支持する内輪が高速回転することによって外輪とハウジングとの間には、クリープと呼ばれるすべり現象が生じやすくなっている。 In recent years, there is a tendency for the rotation of the shaft of an automobile transmission to be accelerated by a motor in an electric vehicle or a hybrid vehicle, and the inner ring that supports the rotating shaft rotates at a high speed, which is called creep between the outer ring and the housing. A slip phenomenon is likely to occur.

上記のクリープ現象は、隙間嵌めされている転がり軸受の外輪とハウジングとの間に外輪外径とハウジング内径との寸法差があるので、外輪外周面がハウジング内周面に内接しながら転がり運動することになり、その際には回転軸の周りに不釣り合いなラジアル荷重が生じるので、外輪外周面やハウジング、その他の周辺部品には滑りによって摩耗が起こりやすくなる現象をいう。 In the above creep phenomenon, there is a dimensional difference between the outer diameter of the outer ring and the inner diameter of the housing between the outer ring of the rolling bearing fitted with a gap and the housing, so that the outer ring outer surface makes rolling motion while inscribed in the housing inner surface. In this case, an unbalanced radial load is generated around the rotating shaft, which means a phenomenon in which the outer peripheral surface of the outer ring, the housing, and other peripheral parts are easily worn by sliding.

図８に示すように、クリープを防止する手段として、ハウジングＨに外輪１がすきま嵌めで保持され、回転軸Ａが挿通した状態で内輪２が回転する転がり軸受の外輪１の外周面に２筋の周溝２０を形成し、各周溝２０には、それぞれ弾性ゴム製のＯリング２１を嵌め、このＯリング２１の弾性変形により生じた応力によって摩擦力を高めてクリープを防止する転がり軸受が知られている（例えば、特許文献１参照）。 As shown in FIG. 8, as a means for preventing creep, the outer ring 1 is held in the housing H with a clearance fit, and the inner ring 2 rotates with the rotary shaft A inserted in the outer ring 1 of the rolling bearing. A rolling bearing is provided in which an O-ring 21 made of an elastic rubber is fitted in each of the circumferential grooves 20, and the frictional force is increased by the stress generated by the elastic deformation of the O-ring 21 to prevent creep. It is known (see, for example, Patent Document 1).

特開２０１５−２１５０６１号公報JP2015-215061A

しかし、上記した従来の転がり軸受は、複数の部品を組み付ける際、外輪の外周面に形成した周溝にＯリング等の環状弾性体を嵌める工程が必要であり、それだけ部品点数と組み立て工程数が多くなり煩雑になるという問題点がある。 However, the conventional rolling bearing described above requires a process of fitting an annular elastic body such as an O-ring in a circumferential groove formed on the outer peripheral surface of the outer ring when assembling a plurality of parts, and the number of parts and the number of assembly processes are accordingly increased. There is a problem that it becomes more complicated.

また、外輪をハウジングにすきま嵌めする組み付け作業を行う際に、環状弾性体の「つぶし代」を圧縮変形させなければ、容易に作業が行えない。また、そのような環状弾性体は溝から脱落したり、損傷することにも注意が必要である。 Further, when performing the assembly work of fitting the outer ring into the housing, the work cannot be easily performed unless the “crushing allowance” of the annular elastic body is compressed and deformed. In addition, it is necessary to pay attention to such an annular elastic body being dropped from the groove or damaged.

更に、外輪の外周面の周溝に環状弾性体を嵌めてハウジングにすきま嵌めすると、外輪の外周面とハウジングとの間は隙間なく密閉されるので、ハウジング内の潤滑油は転がり軸受を軸方向へ通過して移動する経路が外輪と内輪の軸受内の隙間のみになる。 Furthermore, when an annular elastic body is fitted in the circumferential groove on the outer circumferential surface of the outer ring and the housing is loosely fitted, the outer circumferential surface of the outer ring and the housing are sealed without a gap, so that the lubricating oil in the housing causes the rolling bearing to move axially. The path that passes through and moves only to the clearance between the bearings of the outer ring and the inner ring.

そのため、潤滑油が転がり軸受を通過して速やかに循環し難くなって潤滑不良を起こしやすくなる。また、異物が混入した潤滑油が軸受内隙間を通過するときに、転動体と転走面の間に異物が侵入して咬み込まれると、転動体と転走面が損傷して転がり軸受の使用耐久時間が短くなる場合があるという問題点もある。 Therefore, it becomes difficult for the lubricating oil to pass through the rolling bearing and circulate quickly and to cause poor lubrication. In addition, if the foreign material is mixed in and the lubricating oil passes through the clearance in the bearing, if the foreign material enters between the rolling element and the rolling surface and is bitten, the rolling element and the rolling surface are damaged and the rolling bearing There is also a problem that the use durability time may be shortened.

そこで、この発明の課題は、上記した問題点を解決し、転がり軸受のクリープを防止すると共に、転がり軸受の部品点数と組み立て工程数の減少およびその簡略化を図り、更に潤滑性を高めて、転がり軸受の回転を円滑にするクリープ防止転がり軸受とすることである。 Accordingly, the object of the present invention is to solve the above-mentioned problems, prevent creep of the rolling bearing, reduce the number of parts and the number of assembly steps of the rolling bearing, simplify the process, and further improve the lubricity. An anti-creep rolling bearing that smoothens the rotation of the rolling bearing.

上記の課題を解決するために、この発明では固定対象物にすきま嵌めで固定される外輪と、回転軸を保持する内輪と、この内輪の外周面と前記外輪の内周面との間に保持される複数の転動自在な転動体と、を備え、前記外輪の外周面に、軸方向に延びる溝又は周方向に対して傾斜する方向に延びる溝を周方向に間隔を空けて複数形成し、前記溝の前記外周面側の縁に径方向外側に突出する隆条部を設けたクリープ防止転がり軸受としたのである。 In order to solve the above problems, in the present invention, an outer ring that is fixed to a fixed object by a clearance fit, an inner ring that holds a rotation shaft, and an outer ring that is held between the outer ring and the inner ring of the outer ring. A plurality of rolling elements capable of rolling, and a plurality of grooves extending in the axial direction or extending in a direction inclined with respect to the circumferential direction are formed on the outer peripheral surface of the outer ring at intervals in the circumferential direction. The anti-creep rolling bearing is provided with a ridge protruding outward in the radial direction at the edge on the outer peripheral surface side of the groove.

上記したように構成されるこの発明のクリープ防止転がり軸受は、外輪の外周面に形成された軸方向に延びる溝又は周方向に対して傾斜する方向に延びる複数の溝が、ハウジングに対する外輪の外周面の滑り方向である周方向に対して摩擦力を高める向きに配置され、このような複数の各溝の前記外周面側の縁に沿って、前記外輪の径方向に突出しているので、隆条部がすきま嵌めされるハウジングの嵌め合い面の粗さに応じた摩擦力で係止され、クリープが防止される。また、隆条部の高さによってハウジングと外輪の外周面の隙間があり、および（環状弾性体が存在せずに）比較的広い空間の溝内に潤滑油が流通するので、多量の潤滑油を嵌め合い面に導き入れることができる。 The creep-preventing rolling bearing of the present invention configured as described above has an outer circumferential surface of the outer ring with respect to the housing, wherein a groove extending in the axial direction or a plurality of grooves extending in a direction inclined with respect to the circumferential direction is formed on the outer circumferential surface of the outer ring. It is arranged in a direction to increase the frictional force with respect to the circumferential direction, which is the sliding direction of the surface, and protrudes in the radial direction of the outer ring along the edge on the outer peripheral surface side of each of such grooves. Creeping is prevented by engaging the frictional force according to the roughness of the mating surface of the housing in which the strip is loosely fitted. In addition, there is a gap between the outer peripheral surface of the housing and the outer ring depending on the height of the ridge, and the lubricating oil circulates in a groove in a relatively wide space (without an annular elastic body), so a large amount of lubricating oil Can be introduced into the mating surface.

また、隆条部は各溝の前記外周面側の縁に設けられているので、各溝には従来必要であったＯリングのような環状弾性体の必要がなくなり、部品点数も組み立て工程数も増加させない。 In addition, since the ridges are provided on the edge of each groove on the outer peripheral surface side, there is no need for an annular elastic body such as an O-ring that is conventionally required for each groove, and the number of parts is the number of assembly steps. Will not increase.

また、前記複数の溝が、転がり軸受の軸方向の一端から他端に通じるように形成されていることにより、ハウジングと外輪の外周面の間に転がり軸受の軸方向に通じる通油路が形成される。これによって転動体と転走面の間に異物が潤滑油に混ざって咬み込まないようになり、しかも潤滑油の転がり軸受を介した流通性を高めて充分な潤滑性が外部から供給されるようになり、転がり軸受の回転を円滑にできる。 Further, the plurality of grooves are formed so as to communicate from one end to the other end in the axial direction of the rolling bearing, thereby forming an oil passage that communicates in the axial direction of the rolling bearing between the housing and the outer peripheral surface of the outer ring. Is done. This prevents foreign matter from being mixed in the lubricating oil and biting between the rolling elements and the rolling surface, and also increases the flowability of the lubricating oil through the rolling bearing so that sufficient lubricity is supplied from the outside. Thus, the rolling bearing can be smoothly rotated.

このような作用を充分に奏する前記複数の溝の形態として、軸方向に延びる溝であるものが、転がり軸受の軸方向の一端から他端に通じる経路が最も短いものとなって通油性に優れていることからも好ましい。 As a form of the plurality of grooves that sufficiently exhibit such an action, the groove extending in the axial direction has the shortest path leading from one end to the other end in the axial direction of the rolling bearing and has excellent oil permeability. This is also preferable.

また、前記複数の溝は、直線状の溝であれば、潤滑油が溝内をスムーズに通過しやすくて通油性は安定するので、外輪外周面とハウジングのクリープによる摩耗をより確実に防止できる。 In addition, if the plurality of grooves are straight grooves, the lubricating oil can easily pass through the grooves and the oil permeability is stable, so that it is possible to more reliably prevent wear due to creep of the outer ring outer peripheral surface and the housing. .

また、前記複数の溝が、屈曲線状の溝であるものは、流路形状が屈曲して複雑になり、潤滑油が溝内に長時間安定して保持されるので、ハウジング内に存在する潤滑油が少なくてもクリープによる外輪外周面とハウジングの摩耗を安定して防止できる。 In addition, when the plurality of grooves are bent line-shaped grooves, the flow path shape is bent and complicated, and the lubricating oil is stably held in the groove for a long time, so that it exists in the housing. Even if the amount of lubricating oil is small, it is possible to stably prevent the outer ring outer peripheral surface and the housing from being worn by creep.

また、前記複数の溝が、交差状に配置された格子状の溝であれば、流路形状が交差してより複雑になり、潤滑油が外輪外周面とハウジングの間により安定的に保持されて、クリープによる外輪外周面とハウジングの摩耗を確実に防止できる。 Further, if the plurality of grooves are grid-like grooves arranged in an intersecting manner, the shape of the flow path intersects and becomes more complicated, and the lubricating oil is stably held between the outer peripheral surface of the outer ring and the housing. Thus, it is possible to reliably prevent the outer ring outer peripheral surface and the housing from being worn by creep.

この発明は、クリープ防止転がり軸受の外輪の外周面に、軸方向又は周方向に対して傾斜する方向に延びる複数の溝を形成し、前記溝の縁に沿って外周面側に隆条部を設けたので、隆条部がハウジング内側のすきま嵌め用の粗面に対して係止され、ハウジングにすきま嵌めで固定される外輪の外周面におけるクリープが防止され、しかも転がり軸受内部に異物をできるだけ侵入させずに、潤滑油の流通性を高めて充分な潤滑性を確保し、転がり軸受の回転を円滑にすることができる。 According to the present invention, a plurality of grooves extending in an axial direction or a direction inclined with respect to the circumferential direction are formed on the outer peripheral surface of the outer ring of the creep preventing rolling bearing, and a ridge portion is formed on the outer peripheral surface side along the edge of the groove. As a result, the ridges are locked against the rough surface for clearance fitting inside the housing to prevent creeping on the outer peripheral surface of the outer ring that is fixed to the housing by clearance fitting. Without intrusion, the flowability of the lubricating oil can be increased to ensure sufficient lubricity, and the rolling bearing can be smoothly rotated.

そのため、クリープの確実な防止性と共に部品点数と組み立て工程数の減少およびその簡略化が図られ、しかも軸方向に通過する潤滑油の流通性が高められて充分な潤滑性があり、転がり軸受の回転を長期間円滑に保つことができるクリープ防止転がり軸受になる。 Therefore, the number of parts and the number of assembly processes are reduced and simplified as well as reliable prevention of creep, and the flowability of the lubricating oil passing in the axial direction is enhanced, so that sufficient lubricity is provided. It becomes a creep prevention rolling bearing which can keep rotation smoothly for a long time.

第１実施形態のクリープ防止転がり軸受の斜視図The perspective view of the creep prevention rolling bearing of 1st Embodiment 図１の外輪の外周面を拡大して示す斜視図The perspective view which expands and shows the outer peripheral surface of the outer ring | wheel of FIG. 図１の外輪の外周面を拡大して示す断面図Sectional drawing which expands and shows the outer peripheral surface of the outer ring | wheel of FIG. 第１実施形態のクリープ防止転がり軸受の使用状態を示す断面図Sectional drawing which shows the use condition of the creep prevention rolling bearing of 1st Embodiment 第２実施形態のクリープ防止転がり軸受の外周面を拡大して示す斜視図The perspective view which expands and shows the outer peripheral surface of the creep prevention rolling bearing of 2nd Embodiment. 第３実施形態のクリープ防止転がり軸受の外周面を拡大して示す斜視図The perspective view which expands and shows the outer peripheral surface of the creep prevention rolling bearing of 3rd Embodiment. 第４実施形態のクリープ防止転がり軸受の外周面を拡大して示す斜視図The perspective view which expands and shows the outer peripheral surface of the creep prevention rolling bearing of 4th Embodiment. 従来例を示し、クリープ防止転がり軸受の使用状態を示す断面図Sectional view showing the usage state of the anti-creep rolling bearing showing a conventional example

この発明の実施形態を以下に添付図面に基づいて説明する。
図１〜４に示すように、第１実施形態のクリープ防止転がり軸受（以下、単に転がり軸受と呼ぶことがある）は、外輪１と、内輪２と、複数のボールからなる転動体４とを備えた深溝玉軸受である。なお、以下の説明では、転がり軸受の中心軸に沿った方向を「軸方向」、中心軸に直交する方向を「径方向」、中心軸を中心とする円弧に沿う方向を「周方向」と呼ぶ。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1 to 4, the creep preventing rolling bearing of the first embodiment (hereinafter sometimes simply referred to as a rolling bearing) includes an outer ring 1, an inner ring 2, and a rolling element 4 composed of a plurality of balls. A deep groove ball bearing provided. In the following description, the direction along the central axis of the rolling bearing is referred to as “axial direction”, the direction orthogonal to the central axis is referred to as “radial direction”, and the direction along the arc centered on the central axis is referred to as “circumferential direction”. Call.

外輪１は、ハウジングＨの嵌め合い面Ｈ_１にすきま嵌めされ、静止した荷重を受ける。内輪２は、回転軸Ａを保持する。転動体４は、この内輪２の外周面と外輪１の内周面との間に保持器３に保持された状態で転動自在に保持される。外輪１の外周面１ａには、軸方向に延びる複数の溝５を軸方向の一端から他端に通じるように等間隔に配置された隆条部６が設けられている。隆条部６は、溝５の外周面１ａ側の縁に外輪１の径方向外側に突出し、ハウジングＨに圧接されている。 The outer ring 1 is loosely fitted to the plane H ₁ mating housing H, receiving a load stationary. The inner ring 2 holds the rotation axis A. The rolling element 4 is movably held in a state where it is held by the cage 3 between the outer peripheral surface of the inner ring 2 and the inner peripheral surface of the outer ring 1. On the outer peripheral surface 1a of the outer ring 1, ridges 6 are provided that are arranged at equal intervals so that a plurality of grooves 5 extending in the axial direction can be passed from one end to the other end in the axial direction. The ridge 6 protrudes outward in the radial direction of the outer ring 1 at the edge on the outer peripheral surface 1 a side of the groove 5, and is pressed against the housing H.

ここで、ハウジングＨは、外輪１が隙間嵌めで固定される固定対象物である。ハウジングＨは、例えば、自動車用トランスミッションの他、オルタネータ又はカーエアコン用コンプレッサのハウジングが挙げられ、他の周知な各種装置のハウジングであってもよい。また、内輪２に保持される回転軸Ａは、それらの装置においてモータなどで直接的または間接的に駆動される回転軸であり、それらの装置は、通常、潤滑油やグリースの存在下で用いられる。トランスミッションでは、オイルタンク内のトランスミッションオイル（以下、潤滑油Ｒと呼ぶ）がオイルポンプ（図示せず）によって、強制循環している。潤滑油Ｒは、軸受内部に浸入する。例えば、シール部材を備えている軸受であれば、シール部材の隙間から浸入する。 Here, the housing H is a fixed object to which the outer ring 1 is fixed with a gap fit. Examples of the housing H include a housing for an alternator or a compressor for a car air conditioner in addition to a transmission for an automobile, and may be a housing for various other known devices. The rotating shaft A held by the inner ring 2 is a rotating shaft that is directly or indirectly driven by a motor or the like in these devices, and these devices are usually used in the presence of lubricating oil or grease. It is done. In the transmission, transmission oil (hereinafter referred to as lubricating oil R) in the oil tank is forcibly circulated by an oil pump (not shown). The lubricating oil R enters the bearing. For example, if it is a bearing provided with the seal member, it will enter from the gap of the seal member.

外輪１の外周面１ａの複数の溝５は、軸方向に延び、全周に等間隔で配置されるよう形成されており、この溝５の長手方向の両端部は、外輪１の外周面１ａにおいて転がり軸受の軸方向の一端から他端に通じている。このような溝５を形成するための加工方法としては、レーザー加工や切削加工を採用できる。 The plurality of grooves 5 on the outer circumferential surface 1a of the outer ring 1 are formed so as to extend in the axial direction and be arranged at equal intervals on the entire circumference. Both ends in the longitudinal direction of the groove 5 are outer circumferential surfaces 1a of the outer ring 1. In FIG. 1, the axial direction of the rolling bearing leads from one end to the other end. As a processing method for forming such a groove 5, laser processing or cutting can be employed.

そして、図２、３に示すように、溝５の外周面１ａ側の縁に径方向外側に突出する隆条部６がハウジングＨの嵌め合い面Ｈ_１に圧接する高さに盛り上げて設けられており、このような加工をする前の外周面１ａに対しては凸形状となっている。
隆条部６の外形状は、図示したようになだらかな円曲面状の盛り上がりでもよいが、他にも断面が方形状の角柱状の隆条部（図示せず）であってもよい。 As shown in FIGS. 2 and 3, a ridge 6 protruding radially outward is provided at the edge on the outer peripheral surface 1 a side of the groove 5 so as to be raised to a height at which it is pressed against the fitting surface H ₁ of the housing H. The outer peripheral surface 1a before such processing is convex.
The outer shape of the ridge 6 may be a smooth circular curved surface as shown in the figure, but may also be a prismatic ridge (not shown) having a square cross section.

隆条部６は、前述のようにレーザー加工によって溝５を形成する際、溶融した金属が溝壁から両縁部に盛り上がる状態になることを積極的に利用し、さらに必要に応じて溝５の両縁部が軟化している状態で山型などを押し付けて成型してもよい。また溝５を切削加工によって形成する際には、溝５の縁に生じたバリを積極的に残しておき、必要に応じて研磨加工して形状を整えてもよい。 The ridge 6 actively utilizes the fact that when the groove 5 is formed by laser processing as described above, the melted metal rises from the groove wall to both edges, and further, if necessary, the groove 5 It is also possible to mold by pressing a chevron or the like in a state where both edges are softened. Further, when the groove 5 is formed by cutting, a burr generated at the edge of the groove 5 may be left positively and the shape may be adjusted by polishing as necessary.

図３、４に示すように、転がり軸受の使用状態において、隆条部６がハウジングＨの嵌め合い面Ｈ_１に圧接すると、嵌め合い面Ｈ_１に蓋をされたようになって、溝５は管状の通路になる。また外輪１の外周面１ａと嵌め合い面Ｈ_１との間にも軸方向に延びる帯状の隙間が多数形成される。これらの隙間や溝は、いずれも潤滑油Ｒの通路となって、転がり軸受の外部に軸方向に連通する通油路を形成する。例えば、図４の矢印が示す方向に沿って、潤滑油Ｒが流れる。 As shown in FIGS. 3 and 4, in the use state of the rolling bearing, the ridge portion 6 is pressed against the surface H ₁ mating housing H, the surface H ₁ fitting so is capped, trenches 5 Becomes a tubular passage. The band gap is a large number extending in the axial direction between the surface H ₁ fit with the outer peripheral surface 1a of the outer ring 1. These gaps and grooves both serve as passages for the lubricating oil R, and form an oil passage that communicates with the outside of the rolling bearing in the axial direction. For example, the lubricating oil R flows along the direction indicated by the arrow in FIG.

このようにして隆条部６が圧接する状態にすきま嵌めされると、隆条部６は、ハウジングＨの嵌め合い面Ｈ_１の面粗さに応じた摩擦力で係止されてクリープが防止される。隆条部６は、鋼などの金属製外輪１と一体に形成されて硬質の固体であるので、殆ど変形せずにハウジングＨの嵌め合い面Ｈ_１に圧接する。
そのため、従来技術のように、溝５に嵌め入れたゴム製Ｏリングの弾性変形による応力によって摩擦力を高めたり、溝５にダイラタンシー特性を有する素材であって、せん断速度に応じて粘度が増大するプラスチゾルなどからなるクリープ防止材を用いる必要がない。 When ridge portion 6 is loosely fitted in a state of pressure contact this way, ridge portion 6, prevents locked by creep frictional force corresponding to the surface roughness of the surface H ₁ fit the housing H Is done. Ridge portion 6, so formed in the metal outer ring 1 and the integral, such as steel and is a hard solid, is pressed against the mating surface H ₁ of the housing H with little deformation.
Therefore, as in the prior art, the frictional force is increased by the stress caused by the elastic deformation of the rubber O-ring fitted in the groove 5, or the groove 5 has a dilatancy characteristic, and the viscosity increases according to the shear rate. It is not necessary to use an anti-creep material made of plastisol.

また、隆条部６の高さによってハウジングＨと外輪１の外周面１ａとの間にも充分に隙間が形成されるので、クリープ防止材を挿入せずに比較的広い空間の溝５内に潤滑油が流通し、さらに潤滑油Ｒを嵌め合い面に導き入れて流通させることができるので、比較的多量の潤滑油Ｒで外輪１の外側における通油性を高めることができる。
なお、図４中の符号７は、必要に応じて外輪１と内輪２との間に装着される環状シール部材である。 In addition, a sufficient gap is also formed between the housing H and the outer peripheral surface 1a of the outer ring 1 depending on the height of the ridge 6, so that the creeping material is not inserted into the groove 5 in a relatively wide space. Since the lubricating oil circulates and further the lubricating oil R can be introduced into the mating surface and circulated, the oil permeability on the outside of the outer ring 1 can be improved with a relatively large amount of the lubricating oil R.
In addition, the code | symbol 7 in FIG. 4 is the cyclic | annular seal member with which it mounts | wears between the outer ring | wheel 1 and the inner ring | wheel 2 as needed.

このようにして、第１実施形態は、隆条部６および溝５を所定の位置に形成することによって、ハウジングＨにすきま嵌めで固定される外輪１の外周面１ａにおけるクリープを防止し、転がり軸受内部に異物をできるだけ侵入させないようにして潤滑油Ｒの軸受外側の流通性を高めて、転がり軸受の耐久性を高め、回転状態を長期的に円滑に安定させることができる。 In this way, the first embodiment prevents creep on the outer peripheral surface 1a of the outer ring 1 fixed to the housing H by clearance fitting by forming the ridges 6 and the grooves 5 at predetermined positions, and rolling. By preventing foreign matter from entering the bearing as much as possible, the flowability of the lubricating oil R outside the bearing can be improved, the durability of the rolling bearing can be improved, and the rotation state can be stabilized smoothly over a long period of time.

また、オイルポンプ等で潤滑油を強制的に潤滑させる場合、潤滑油の流動性が悪いと、トランスミッション内のオイルタンクに油が戻り難く、軸受内部に安定して潤滑油を供給できない場合がある。この場合、転がり軸受における潤滑不良の発生に注意する必要がある。本実施形態では、軸方向の一端から他端に通じる溝５が外輪１の外周面に複数形成されており、当該溝５も潤滑油の通路となるので、軸受内部のみを潤滑油が流れる場合と比べて、転がり軸受の通油性が向上し、循環する潤滑油の流動性を向上できるため、上記潤滑不良の発生を抑え易くなる。 In addition, when lubricating oil is forcibly lubricated with an oil pump or the like, if the fluidity of the lubricating oil is poor, it may be difficult for the oil to return to the oil tank in the transmission, and the lubricating oil may not be stably supplied into the bearing. . In this case, it is necessary to pay attention to the occurrence of poor lubrication in the rolling bearing. In the present embodiment, a plurality of grooves 5 communicating from one end to the other end in the axial direction are formed on the outer peripheral surface of the outer ring 1, and the grooves 5 also serve as lubricating oil passages, so that the lubricating oil flows only inside the bearing. As compared with the above, the oil permeability of the rolling bearing is improved, and the fluidity of the circulating lubricating oil can be improved.

次に、図５に示す第２実施形態のクリープ防止転がり軸受は、溝８が、外輪１の周方向に対して４５°に傾斜する方向に延びる溝８であること以外は、第１実施形態と同様に構成したものである。 Next, the creep preventing rolling bearing of the second embodiment shown in FIG. 5 is the first embodiment except that the groove 8 is a groove 8 extending in a direction inclined at 45 ° with respect to the circumferential direction of the outer ring 1. It is comprised similarly to.

また、図６に示す第３実施形態のクリープ防止転がり軸受は、溝９が、外輪１の外周面１ａの幅方向の中央部で線対称になるよう「くの字型」に屈曲した形態であることの他は、第１実施形態と同様に構成したものである。 Further, the anti-creep rolling bearing of the third embodiment shown in FIG. 6 has a shape in which the groove 9 is bent in a “shape” so that it is line-symmetrical at the center in the width direction of the outer peripheral surface 1a of the outer ring 1. Except for this, the configuration is the same as in the first embodiment.

このように構成される第２及び第３実施形態は、各溝８、９の通路が転がり軸受の軸方向に対して傾斜し、かつそれら溝８、９の長さが、第１実施形態のものに比べて長いので、潤滑油量が比較的少ない場合でも、所要量の潤滑油を嵌め合い面に留めておく時間を長くでき、より安定したクリープ防止性を発揮させることができる。 In the second and third embodiments configured as described above, the paths of the grooves 8 and 9 are inclined with respect to the axial direction of the rolling bearing, and the lengths of the grooves 8 and 9 are the same as those of the first embodiment. Since it is longer than that of the conventional one, even when the amount of lubricating oil is relatively small, it is possible to lengthen the time for keeping the required amount of lubricating oil on the mating surface, and to exhibit more stable creep prevention.

また、図７に示す第４実施形態のクリープ防止転がり軸受は、溝１０が、外輪１の外周面１ａに交差状に配置された格子状の溝１０であることの他は、第１実施形態と同様に構成したものである。 Moreover, the anti-creep rolling bearing of the fourth embodiment shown in FIG. 7 is the first embodiment except that the grooves 10 are grid-like grooves 10 arranged intersecting the outer peripheral surface 1a of the outer ring 1. It is comprised similarly to.

このように構成される第４実施形態は、流路形状が交差してより複雑になり、潤滑油が外輪１の外周面１ａとハウジングＨの間により安定的に保持されるから、クリープによる外周面１ａとハウジングＨの摩耗をより確実に防止できるものである。 In the fourth embodiment configured in this way, the flow path shapes intersect and become more complicated, and the lubricating oil is held more stably between the outer peripheral surface 1a of the outer ring 1 and the housing H. The wear of the surface 1a and the housing H can be prevented more reliably.

なお、上記した実施形態において、転がり軸受は、深溝玉軸受を図示したが、アンギュラ玉軸受その他の周知なものであってもよく、また転動体として図示したボール以外に円筒ころや円錐ころを用い、ころ軸受であってもよいのは勿論である。 In the above-described embodiment, the rolling bearing is illustrated as a deep groove ball bearing, but it may be an angular ball bearing or other well-known bearings, and a cylindrical roller or a tapered roller is used in addition to the illustrated ball as a rolling element. Of course, it may be a roller bearing.

１外輪
２内輪
３保持器
４転動体
５、８、９、１０溝
６隆条部
７環状シール部材
２０周溝
Ｈハウジング（固定対象物）
Ｈ_１嵌め合い面
Ａ回転軸
Ｒ潤滑油 Reference Signs List 1 outer ring 2 inner ring 3 cage 4 rolling elements 5, 8, 9, 10 groove 6 ridge 7 annular seal member 20 circumferential groove H housing (fixed object)
H ₁ mating surface A Rotating shaft R Lubricating oil

Claims

固定対象物にすきま嵌めで固定される外輪と、
回転軸を保持する内輪と、
前記外輪の内周面と前記内輪の外周面との間に保持される複数の転動自在な転動体と、を備え、
前記外輪の外周面に、軸方向に延びる溝又は周方向に対して傾斜する方向に延びる溝が周方向に間隔を空けて複数形成され、
前記溝の前記外周面側の縁に径方向外側に突出する隆条部を設けられているクリープ防止転がり軸受。 An outer ring fixed to a fixed object by a clearance fit;
An inner ring that holds the rotating shaft;
A plurality of rollable rolling elements held between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring,
On the outer peripheral surface of the outer ring, a plurality of grooves extending in the axial direction or extending in a direction inclined with respect to the circumferential direction are formed at intervals in the circumferential direction.
An anti-creep rolling bearing provided with a ridge protruding outward in the radial direction at an edge on the outer peripheral surface side of the groove.

前記溝が、転がり軸受の軸方向の一端から他端に通じる溝である請求項１に記載のクリープ防止転がり軸受。 The creep-preventing rolling bearing according to claim 1, wherein the groove is a groove that communicates from one end to the other end in the axial direction of the rolling bearing.

前記溝が、直線状の溝である請求項１または２に記載のクリープ防止転がり軸受。 The creep-preventing rolling bearing according to claim 1 or 2, wherein the groove is a linear groove.

前記溝が、屈曲線状の溝である請求項１または２に記載のクリープ防止転がり軸受。 The creep-preventing rolling bearing according to claim 1 or 2, wherein the groove is a bent line-shaped groove.

前記溝が、交差状に配置された格子状の溝である請求項１または２に記載のクリープ防止転がり軸受。 The creep-preventing rolling bearing according to claim 1 or 2, wherein the grooves are lattice-like grooves arranged in an intersecting manner.