JP2009228700A - Roller bearing for image formation device - Google Patents

Roller bearing for image formation device Download PDF

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JP2009228700A
JP2009228700A JP2008071766A JP2008071766A JP2009228700A JP 2009228700 A JP2009228700 A JP 2009228700A JP 2008071766 A JP2008071766 A JP 2008071766A JP 2008071766 A JP2008071766 A JP 2008071766A JP 2009228700 A JP2009228700 A JP 2009228700A
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rolling bearing
inner diameter
inner ring
roller
diameter portion
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Yosuke Naotsuka
洋介 猶塚
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)
  • Support Of The Bearing (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing for a highly reliable image formation device, reversibly preventing problems of unusual sound and wearing out, while an assemblability and maintainability of a roller rotation body are excellent. <P>SOLUTION: The roller bearing 10 is provided with an outer ring 11 and an inner ring 12 which are relatively rotatably via a rolling element 15. Between these rings, the inner ring 12 is comprised of: an outer bore side 13 having rolling surface 12a1 of the rolling element 15 ; and an inner bore side 14 which is impregnated with a lube fluid into the inner air hole, and is fitted in and held by the outer periphery of the axial part 6 relatively rotatably against axial part 6 of the roller rotation body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、転がり軸受に関し、特に、複写機、プリンタ、ファクシミリ、あるいはこれらの複合機等の画像形成装置に装備されるローラ状回転体を支持するための転がり軸受に関する。   The present invention relates to a rolling bearing, and more particularly to a rolling bearing for supporting a roller-like rotating body provided in an image forming apparatus such as a copying machine, a printer, a facsimile machine, or a composite machine thereof.

上記の各種画像形成装置には、例えば、現像剤（例えば、トナー）を攪拌するトナー攪拌ローラ、トナーを感光ドラムの外周面に付着させることで感光ドラムの外周面に形成された静電潜像を現像する現像ローラ、現像した画像を出力紙に転写するための転写ローラ、転写された画像を出力紙に定着させる定着ローラ等、多数のローラ状回転体が組み込まれ、これらローラ状回転体は、静止側の部材に装着された軸受によって回転自在に支持される。この種の軸受としては、転動体を介して相対回転可能に設けられた内輪および外輪を具備する転がり軸受を用いる場合がある（例えば、特許文献１を参照）。
特開平８−１９０２７０号公報 The various image forming apparatuses described above include, for example, a toner stirring roller that stirs a developer (for example, toner), and an electrostatic latent image formed on the outer peripheral surface of the photosensitive drum by attaching the toner to the outer peripheral surface of the photosensitive drum. A large number of roller-like rotating bodies are incorporated, such as a developing roller for developing the image, a transfer roller for transferring the developed image to the output paper, and a fixing roller for fixing the transferred image to the output paper. , And is rotatably supported by a bearing mounted on the stationary member. As this type of bearing, there is a case where a rolling bearing having an inner ring and an outer ring provided so as to be relatively rotatable via rolling elements is used (see, for example, Patent Document 1).
JP-A-8-190270

上記の転がり軸受は、例えば、外輪を静止部材（例えば、現像剤が充填された現像槽）に固定すると共に、内輪をローラ状回転体の外周に嵌合し、両輪間に介在させた転動体を介して外輪と内輪とを相対回転可能とすることで、ローラ状回転体を静止部材に対して回転自在に支持する。このとき、軸部と内輪の間の締結強度が不十分であると両者間ですべりが生じて異音が発生したり、ローラ状回転体の軸部あるいは内輪が摩耗したりする等の問題が生じることから、軸部と内輪とは強固に結合一体化されるのが一般的である。しかしながら、軸部と内輪とを強固に結合一体化すると、内輪に対するローラ状回転体の組付け性や、ローラ状回転体の交換性（メンテナンス性）が悪いという問題が生じる。かかる問題は、例えば、転がり軸受に代えて樹脂製や焼結金属製のすべり軸受を用いることで解消し得るが、これらのすべり軸受が許容し得る負荷荷重は転がり軸受に比べて小さく、従って耐摩耗性（耐久寿命）の点で難がある。   The above rolling bearing is, for example, a rolling element in which an outer ring is fixed to a stationary member (for example, a developer tank filled with a developer), and an inner ring is fitted to the outer periphery of a roller-like rotating body and is interposed between the two wheels. By allowing the outer ring and the inner ring to rotate relative to each other, the roller-like rotating body is rotatably supported with respect to the stationary member. At this time, if the fastening strength between the shaft portion and the inner ring is insufficient, there will be problems such as slippage between the two and abnormal noise, wear of the shaft portion or inner ring of the roller-shaped rotating body, etc. As a result, the shaft portion and the inner ring are generally firmly coupled and integrated. However, if the shaft portion and the inner ring are firmly coupled and integrated, there arises a problem that the assemblability of the roller-shaped rotating body with respect to the inner ring and the exchangeability (maintenance) of the roller-shaped rotating body are poor. Such a problem can be solved by, for example, using a plastic or sintered metal sliding bearing instead of the rolling bearing, but the load load that can be tolerated by these sliding bearings is smaller than that of the rolling bearing, and is therefore resistant. There is difficulty in terms of wear (durable life).

本発明は上記の問題点に鑑みてなされたものであり、その課題とするところは、ローラ状回転体の組付け性やメンテナンス性が良好でありながら、異音や摩耗の問題を可及的に防止することができる画像形成装置用の転がり軸受を提供することにある。   The present invention has been made in view of the above problems, and the problem is that the problem of abnormal noise and wear is as much as possible while the assembly and maintenance properties of the roller-like rotating body are good. Another object of the present invention is to provide a rolling bearing for an image forming apparatus that can be prevented.

上記課題を解決するため、本発明では、画像形成装置に組み込まれるローラ状回転体を支持するための転がり軸受であって、静止部材に固定される外輪と、外輪の内周に組み込まれた複数の転動体と、ローラ状回転体の軸部の外周に嵌合され、転動体を介して外輪に対して相対回転する内輪とを備えるものにおいて、内輪が、転動体の転送面を有する外径部と、内部気孔に潤滑流体を含浸させた多孔質体からなる内径部とを有し、かつ、軸部に対して相対回転可能に軸部の外周に嵌合されることを特徴とする画像形成装置用転がり軸受を提供する。   In order to solve the above-described problems, the present invention provides a rolling bearing for supporting a roller-like rotating body incorporated in an image forming apparatus, an outer ring fixed to a stationary member, and a plurality of inner parts incorporated on the inner periphery of the outer ring. And an inner ring that is fitted to the outer periphery of the shaft portion of the roller-shaped rotating body and rotates relative to the outer ring via the rolling element, the inner ring has an outer diameter having a transfer surface of the rolling element And an inner diameter portion made of a porous body in which internal pores are impregnated with a lubricating fluid, and is fitted to the outer periphery of the shaft portion so as to be rotatable relative to the shaft portion. A rolling bearing for a forming apparatus is provided.

上記構成によれば、内径部の内部気孔に含浸させた潤滑流体の滲み出しにより、内輪と、ローラ状回転体の軸部との間に常時潤沢な潤滑流体を介在させることができる。そのため、内輪が、ローラ状回転体の軸部に対して相対回転可能に嵌合され、内輪とローラ状回転体の軸部との間ですべりが生じ得る本発明の構成においても、内輪（の内径部）と軸部との間で良好な摺動潤滑状態が得られ、異音の発生や軸又は内輪の摩耗を可及的に防止することができる。一方、例えば内輪と軸部との間に両者が一体回転し得る程度の動摩擦力が生じる場合には、この種の転がり軸受の本来的な機能、すなわち内輪と外輪とが相対回転することにより、ローラ状回転体（の軸部）を静止側の部材に対して回転自在に支持することができる。   According to the above configuration, the lubricant fluid that has been impregnated in the internal pores of the inner diameter portion can be always filled with abundant lubricating fluid between the inner ring and the shaft portion of the roller-like rotating body. Therefore, even in the configuration of the present invention in which the inner ring is fitted so as to be rotatable relative to the shaft portion of the roller-shaped rotating body, and slippage may occur between the inner ring and the shaft portion of the roller-shaped rotating body, A good sliding lubrication state is obtained between the inner diameter portion and the shaft portion, and generation of abnormal noise and wear of the shaft or inner ring can be prevented as much as possible. On the other hand, for example, when a dynamic friction force is generated between the inner ring and the shaft portion so that both can rotate integrally, the original function of this type of rolling bearing, that is, the inner ring and the outer ring rotate relative to each other, The roller-like rotating body (the shaft portion thereof) can be rotatably supported with respect to the stationary side member.

また、本発明に係る転がり軸受は、内輪が、ローラ状回転体の軸部に対して相対回転可能に軸部の外周に嵌合される。これはすなわち、内輪を、組付け性や交換性が悪化しない程度の嵌め合いでもってローラ状回転体の軸部の外周に嵌合可能であることを意味し、従って、内輪に対するローラ状回転体の組付け性や交換性を、従来の転がり軸受に比べて高めることができる。なお、外径部と内径部の固定手段は任意であるが、コスト増を極力抑制する観点から出来るだけ簡易な手段が望ましく、例えば圧入固定が好適である。また、多孔質体からなる内径部は、焼結金属の多孔質体、多孔質樹脂、あるいはセラミックスで形成することができる。   In the rolling bearing according to the present invention, the inner ring is fitted on the outer periphery of the shaft portion so as to be relatively rotatable with respect to the shaft portion of the roller-like rotating body. This means that the inner ring can be fitted to the outer periphery of the shaft portion of the roller-like rotator with a fit that does not deteriorate the assemblability and exchangeability. The assemblability and exchangeability can be improved as compared with conventional rolling bearings. The fixing means for the outer diameter part and the inner diameter part is arbitrary, but simpler means are desirable from the viewpoint of suppressing an increase in cost as much as possible, and for example, press-fitting and fixing are preferable. The inner diameter portion made of a porous body can be formed of a sintered metal porous body, a porous resin, or ceramics.

上記構成において、内径部に含浸させる潤滑流体をグリースとすれば、潤滑流体の飛散による周辺環境の汚染や油膜切れを可及的に防止することができる。グリースは、潤滑油等に比べ粘度が高く、保持性に優れる（流動性が低い）からである。   In the above configuration, if the lubricating fluid impregnated in the inner diameter portion is grease, contamination of the surrounding environment and oil film breakage due to scattering of the lubricating fluid can be prevented as much as possible. This is because grease has a higher viscosity than lubricating oil and has excellent retention (low fluidity).

油膜の形成を容易化して、所期の油膜剛性を確保する観点から、内径部のうち、少なくともローラ状回転体の軸部との接触領域には封孔処理を施しておくのが望ましい。封孔処理の手段に特段の限定はなく、例えば目潰し処理や樹脂被膜（樹脂層）を形成することが考えられる。   From the viewpoint of facilitating the formation of the oil film and ensuring the desired oil film rigidity, it is desirable that at least a contact region of the inner diameter portion with the shaft portion of the roller-shaped rotating body is subjected to a sealing treatment. There is no particular limitation on the means for the sealing treatment, and for example, a crushing treatment or a resin coating (resin layer) can be considered.

内径部の内周両端には、内径部の軸方向中央部から離反する方向に内径寸法が漸次拡大する逃げ部を設けることができる。このようにすれば、内輪と軸部の間の揺動変位（調心移動）を許容することが可能となり、回転性能の安定化を図ることができる。また、軸部との接触面積が減少するため、内径部および軸部の摩耗を効果的に抑制あるいは防止することが可能となる。   At both inner peripheral ends of the inner diameter portion, relief portions in which the inner diameter dimension gradually increases in a direction away from the axial central portion of the inner diameter portion can be provided. In this way, it is possible to allow the rocking displacement (alignment movement) between the inner ring and the shaft portion, and the rotation performance can be stabilized. In addition, since the contact area with the shaft portion is reduced, wear of the inner diameter portion and the shaft portion can be effectively suppressed or prevented.

多孔質体からなる内径部は、アルミ青銅を主成分とする原料粉を用いて成形された焼結金属の多孔質体とするのが望ましい。焼結金属は多孔質樹脂に比べて高い耐摩耗性を具備すると共にセラミックスよりも安価であり、特にアルミ青銅は、焼結金属製の軸受の成形に一般的に用いられるその他の金属粉末、例えば銅や鉄に比べ摺動特性に優れるからである。これにより、軸部との間で繰り返し摺動接触が生じた場合でも、内径部の摩耗がより効果的に抑制あるいは防止される。   The inner diameter portion made of a porous body is preferably a sintered metal porous body formed using a raw material powder mainly composed of aluminum bronze. Sintered metal has higher wear resistance than porous resin and is less expensive than ceramics. In particular, aluminum bronze is another metal powder commonly used for forming bearings made of sintered metal, for example, This is because the sliding properties are superior to copper and iron. Thereby, even when sliding contact with the shaft portion repeatedly occurs, wear of the inner diameter portion is more effectively suppressed or prevented.

また、上記課題を解決するため、本発明ではさらに、画像形成装置に組み込まれるローラ状回転体を支持するための転がり軸受であって、静止部材に保持される外輪と、外輪の内周に組み込まれた複数の転動体と、ローラ状回転体の軸部の外周に嵌合され、転動体を介して外輪に対して相対回転する内輪とを備えるものにおいて、内輪が、軸部と周方向で相互に係合する係合部を有する画像形成装置用転がり軸受を提供する。   In order to solve the above-described problem, the present invention further includes a rolling bearing for supporting a roller-like rotating body incorporated in the image forming apparatus, and an outer ring held by a stationary member and an inner ring of the outer ring. A plurality of rolling elements, and an inner ring that is fitted to the outer periphery of the shaft portion of the roller-like rotating body and rotates relative to the outer ring via the rolling element. Provided is a rolling bearing for an image forming apparatus having engaging portions that engage with each other.

このように、内輪が、軸部と周方向で相互に係合する係合部を有するものであれば、内輪と軸部の間の結合強度を緩和して良好な組付け性やメンテナンス性を確保しつつも、内輪と軸部とが周方向ですべることによって生じる弊害、すなわち異音や摩耗の問題が生じるのを可及的に防止することができる。なお、係合部の形態は任意であり、内輪の内径面を部分的にストレートな面に形成することによって得ることができる他、他所よりも内径側に突出した凸状部を形成することによって得ることができる。但しこの場合、軸部は、その断面形状が係合部の形状に概ね対応したものとするのが肝要である。   In this way, if the inner ring has an engaging part that engages with the shaft part in the circumferential direction, the coupling strength between the inner ring and the shaft part is relaxed, and good assemblability and maintainability are achieved. While ensuring, it is possible to prevent as much as possible the adverse effects caused by sliding of the inner ring and the shaft portion in the circumferential direction, that is, the problem of abnormal noise and wear. In addition, the form of the engaging portion is arbitrary, and it can be obtained by forming the inner diameter surface of the inner ring partially in a straight surface, or by forming a convex portion protruding toward the inner diameter side from other places. Obtainable. However, in this case, it is important that the shaft portion has a cross-sectional shape generally corresponding to the shape of the engaging portion.

以上に示すように、本発明に係る転がり軸受は、転がり軸受としての本来的な機能に加え、すべり軸受としての機能をも具備するものである。そのため、本発明によれば、ローラ状回転体の組付け性やメンテナンス性が良好でありながら、異音や摩耗の問題を可及的に防止することができる転がり軸受を提供することができる。   As described above, the rolling bearing according to the present invention has a function as a sliding bearing in addition to the original function as a rolling bearing. Therefore, according to the present invention, it is possible to provide a rolling bearing capable of preventing noise and wear problems as much as possible while maintaining the ease of assembly and maintenance of the roller-shaped rotating body.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の第１実施形態に係る転がり軸受を組み込んだ画像形成装置、より詳細には画像形成装置を構成する現像装置の要部を概念的に示す断面図である。同図に示す現像装置１は、トナー（現像剤）７が充填された現像槽５内に平行配置されたトナー攪拌ローラ２，３、現像ローラ４、および感光ドラム９を主要な構成として備える。各ローラ２，３，４は、それぞれ軸部６を有し、該軸部６を、現像槽５の内壁５ａと外壁５ｂとの間に配設された転がり軸受１０で支持することによって静止側の部材（ここでは現像槽５）に対して回転自在に支持される。各軸部６の端部は、外壁５ｂの外部に所定量突出しており、突出した端部にはプーリ等からなる回転駆動部７が一体的に設けられている。この回転駆動部７は、図示しない動力伝達ベルトと係合し、回転動力を各軸部６（ローラ２，３，４）に付与する役割を担う。各軸部６にはゴム製のシール部材８が取り付けられており、このシール部材８の一端に設けたシールリップを現像槽５の内壁５ａに摺接させることで、現像槽５外へトナー７が漏れ出すのを、また転がり軸受１０と軸部６との間にトナー７が侵入するのを防止するようにしている。   FIG. 1 is a cross-sectional view conceptually showing an essential part of an image forming apparatus incorporating a rolling bearing according to the first embodiment of the present invention, more specifically, a developing device constituting the image forming apparatus. The developing device 1 shown in the figure includes, as main components, toner stirring rollers 2 and 3, a developing roller 4, and a photosensitive drum 9 arranged in parallel in a developing tank 5 filled with toner (developer) 7. Each of the rollers 2, 3, 4 has a shaft portion 6, and the shaft portion 6 is supported by a rolling bearing 10 disposed between the inner wall 5 a and the outer wall 5 b of the developing tank 5. These members (here, the developing tank 5) are rotatably supported. An end portion of each shaft portion 6 protrudes by a predetermined amount to the outside of the outer wall 5b, and a rotation driving portion 7 made of a pulley or the like is integrally provided at the protruding end portion. The rotational drive unit 7 engages with a power transmission belt (not shown) and plays a role of applying rotational power to the shaft units 6 (rollers 2, 3 and 4). A rubber seal member 8 is attached to each shaft portion 6, and a toner lip 7 is provided outside the developing tank 5 by sliding a seal lip provided at one end of the seal member 8 against the inner wall 5 a of the developing tank 5. The toner 7 is prevented from leaking out, and the toner 7 is prevented from entering between the rolling bearing 10 and the shaft portion 6.

次に、本発明の要旨である転がり軸受１０を図２に基づいて詳述する。同図に示す転がり軸受１０は、外輪１１および内輪１２と、外輪１１と内輪１２との間に介装された複数の転動体（例えば、ボール）１５と、転動体１５を円周方向等間隔で保持する図示しない保持器とで主要部が構成される。外輪１１は現像槽５に取り付けられて静止側を構成し、内輪１２はローラの軸部６の外周に嵌合されて可動側（回転側）を構成する。外輪１１の内周面１１ａおよび内輪１２の外周面１２ａには対をなすかたちで複数の転送面１１ａ１，１２ａ１が形成され、各転動体１５は転送面１１ａ１，１２ａ１間で転動自在に保持されるようになっている。   Next, the rolling bearing 10 which is the gist of the present invention will be described in detail with reference to FIG. The rolling bearing 10 shown in the figure includes an outer ring 11 and an inner ring 12, a plurality of rolling elements (for example, balls) 15 interposed between the outer ring 11 and the inner ring 12, and the rolling elements 15 at equal intervals in the circumferential direction. The main part is comprised with the holder | retainer which is hold | maintained by (not shown). The outer ring 11 is attached to the developing tank 5 to constitute the stationary side, and the inner ring 12 is fitted to the outer periphery of the shaft portion 6 of the roller to constitute the movable side (rotating side). A plurality of transfer surfaces 11a1 and 12a1 are formed in pairs on the inner peripheral surface 11a of the outer ring 11 and the outer peripheral surface 12a of the inner ring 12, and each rolling element 15 is held between the transfer surfaces 11a1 and 12a1 so as to be rotatable. It has come to be.

内輪１２は、外周面１２ａに転動体１５の転送面１２ａ１が形成された外径部１３と、外径部１３の内周に配設された内径部１４とからなり、本実施形態では、外径部１３の内周に内径部１４を圧入固定することにより、両者が結合一体化されている。外径部１３は、例えばステンレス鋼等、高剛性の金属材料で形成される一方、内径部１４は焼結金属の多孔質体からなり、その内部気孔には潤滑流体が含浸されている（含油焼結金属）。   The inner ring 12 includes an outer diameter portion 13 having a transfer surface 12a1 of the rolling element 15 formed on the outer peripheral surface 12a, and an inner diameter portion 14 disposed on the inner periphery of the outer diameter portion 13. The inner diameter portion 14 is press-fitted and fixed to the inner periphery of the diameter portion 13, so that both are combined and integrated. The outer diameter portion 13 is formed of a highly rigid metal material such as stainless steel, for example, while the inner diameter portion 14 is made of a sintered metal porous body, and the internal pores are impregnated with a lubricating fluid (oil-impregnated). Sintered metal).

内輪１２（内径部１４）の内周面１２ｂは軸線と平行な円筒面とされ、内周面１２ｂのうち、少なくとも軸部６の外周面と接触する領域（本実施形態では内周面全体が接触可能である）には封孔処理が施されている。封孔処理の手法に特段の限定はなく、目潰し処理や樹脂被膜の形成といった公知の各種手法が採用可能であるが、本実施形態では内径部１２の成形工程に含まれるサイジング工程において、内径部１２の各所を所定形状および所定寸法に成形するのと同時に目潰し処理がなされることにより封孔処理が施される。   An inner peripheral surface 12b of the inner ring 12 (inner diameter portion 14) is a cylindrical surface parallel to the axis, and a region of the inner peripheral surface 12b that is in contact with at least the outer peripheral surface of the shaft portion 6 (in this embodiment, the entire inner peripheral surface is (Can be contacted) is sealed. There is no particular limitation on the method of sealing treatment, and various known methods such as crushing treatment and resin film formation can be adopted. In this embodiment, in the sizing process included in the molding process of the inner diameter portion 12, the inner diameter portion A sealing process is performed by performing a crushing process at the same time that the 12 parts are formed into a predetermined shape and a predetermined size.

内輪１２は、軸部６に対して相対回転可能に軸部６に嵌合保持される。これを実現すべく、内輪１２（内径部１４）の内径寸法は、軸部６の外径寸法と同一か、もしくは若干量大径に形成される。   The inner ring 12 is fitted and held on the shaft portion 6 so as to be rotatable relative to the shaft portion 6. In order to realize this, the inner diameter of the inner ring 12 (inner diameter part 14) is formed to be the same as or slightly larger than the outer diameter of the shaft part 6.

ここで、上記構成からなる内輪１２の製造方法を、内径部１４の製造工程を中心に以下簡単に説明する。   Here, the manufacturing method of the inner ring 12 having the above-described configuration will be briefly described below, focusing on the manufacturing process of the inner diameter portion 14.

内輪１２を構成する焼結金属製の内径部１４は、主に、圧粉工程と、焼結工程と、サイジング工程と、潤滑流体の含浸工程とを順に経て製造される。詳細に述べると、まず圧粉工程では、原料粉を成形型内に充填し、これを圧縮成形することで完成品に略等しい形状の圧粉成形体を得る。本実施形態では、摺動特性に特に優れるアルミ青銅粉を主成分とし、これに必要に応じてＳｎ等のバインダ、さらには黒鉛や二硫化モリブデン等の固体潤滑剤を添加した原料粉を用いて圧粉成形体を成形する。もちろん、内径部１４の成形に使用可能な金属粉は上記のアルミ青銅粉に限定されるわけではなく、鉄系あるいは銅系の金属粉末等、この種の軸受の製造に使用可能なその他の金属粉末を使用することも可能である。   The sintered metal inner diameter portion 14 constituting the inner ring 12 is mainly manufactured through a compacting process, a sintering process, a sizing process, and a lubricating fluid impregnation process in this order. More specifically, first, in the compacting step, the raw material powder is filled into a molding die, and this is compression molded to obtain a compacted body having a shape substantially equal to the finished product. In this embodiment, aluminum bronze powder that is particularly excellent in sliding properties is used as a main component, and if necessary, a raw material powder to which a binder such as Sn and a solid lubricant such as graphite and molybdenum disulfide are added as necessary. A green compact is formed. Of course, the metal powder that can be used for forming the inner diameter portion 14 is not limited to the above-mentioned aluminum bronze powder, and other metals that can be used for manufacturing this type of bearing, such as iron-based or copper-based metal powder. It is also possible to use powder.

圧粉工程で得られた圧粉成形体は焼結工程に移送され、この焼結工程で、使用した金属粉末（ここではアルミ青銅）の焼結温度まで加熱することにより、密着する金属粉末同士を焼結結合させて焼結体を得る。このようにして得られた焼結体はサイジング工程に移送され、この工程で焼結体に対して適当な圧迫力を付与することにより、焼結体の各部が所定形状および所定寸法に成形され、またこれと同時に焼結体内周面の表面開孔が適当に封孔処理（目潰し処理）される。   The green compacts obtained in the compacting process are transferred to the sintering process, and in this sintering process, the metal powders that are in close contact with each other are heated to the sintering temperature of the metal powder used (here, aluminum bronze). Are sintered and bonded to obtain a sintered body. The sintered body thus obtained is transferred to a sizing process, and by applying an appropriate pressing force to the sintered body in this process, each part of the sintered body is formed into a predetermined shape and a predetermined size. At the same time, the surface opening on the peripheral surface of the sintered body is appropriately sealed (crushing).

所定形状に形成された焼結体は潤滑流体の含浸工程に移送され、内部気孔に潤滑流体を含浸させることにより、完成品としての内径部１４が得られる。潤滑流体としては、潤滑油あるいはグリースを使用することができ、本実施形態ではグリースを用いている。なお、使用可能なグリースに特段の限定はなく、例えば、リチウム石鹸−ジエステル系、リチウム石鹸−ポリαオレフィン系、リチウム石鹸−ジアルキルジフェニルエーテル系、リチウム石鹸−鉱油系、アルミニウム石鹸−鉱油系、ナトリウム石鹸−鉱油系、リチウム石鹸−ジエステル鉱油系、非石鹸−ジエステル系、非石鹸−鉱油系、非石鹸−ポリオールエステル系、リチウム石鹸−ポリオールエステル系等のグリースが使用可能である。   The sintered body formed in a predetermined shape is transferred to a lubricating fluid impregnation process, and the internal pores 14 as a finished product are obtained by impregnating the internal pores with the lubricating fluid. As the lubricating fluid, lubricating oil or grease can be used, and grease is used in this embodiment. The usable grease is not particularly limited. For example, lithium soap-diester, lithium soap-polyalphaolefin, lithium soap-dialkyldiphenyl ether, lithium soap-mineral oil, aluminum soap-mineral oil, sodium soap -Grease of mineral oil type, lithium soap-diester mineral oil type, non-soap-diester type, non-soap-mineral oil type, non-soap-polyol ester type, lithium soap-polyol ester type, etc. can be used.

以上の各工程を経て図２に示す内径部１４が完成する。そして、この内径部１４を機械加工や鍛造加工で別途形成した外径部１３の内周に圧入することにより、完成品としての内輪１２が得られる。   Through the above steps, the inner diameter portion 14 shown in FIG. 2 is completed. Then, the inner ring 12 as a finished product is obtained by press-fitting the inner diameter portion 14 into the inner circumference of the outer diameter portion 13 separately formed by machining or forging.

本発明に係る転がり軸受１０は以上の構成からなり、また以上のようにして製造される。そして各ローラの軸部６は、以下示す態様で転がり軸受１０によって回転自在に支持される。   The rolling bearing 10 according to the present invention has the above configuration and is manufactured as described above. And the axial part 6 of each roller is rotatably supported by the rolling bearing 10 by the aspect shown below.

まず、図示しない動力伝達ベルトが回転することによって、回転駆動部７を介して各軸部６（ローラ２，３，４）に回転動力が付与されると、各ローラの軸部６は、転がり軸受１０によって回転自在に支持される。   First, when a power transmission belt (not shown) rotates and rotational power is applied to each shaft portion 6 (rollers 2, 3, 4) via the rotation driving portion 7, the shaft portion 6 of each roller rolls. The bearing 10 is rotatably supported.

このとき、転がり軸受１０の内輪１２は、内径側領域を構成する内径部１４が内部気孔に潤滑流体（グリース）を含浸させた焼結金属の多孔質体とされていることから、その内周に嵌合される軸部６との間に、常時潤沢な潤滑流体を介在させることができる。そのため、内輪１２が、軸部６に対して相対回転可能に軸部６に嵌合保持され、内輪１２と軸部６との間ですべりが生じることによって軸部６が回転自在に支持される場合であっても、内輪１２と軸部６との間で良好な摺動潤滑状態が得られ、異音の発生や軸部６および内輪１２（内径部１４）の摩耗を可及的に防止することができる。また、内径部１４が焼結金属製であることから、特に高い耐摩耗性を具備する   At this time, the inner ring 12 of the rolling bearing 10 is made of a sintered metal porous body in which the inner diameter portion 14 constituting the inner diameter side region is impregnated with lubricating fluid (grease) in the inner pores. A sufficient amount of lubricating fluid can be interposed between the shaft portion 6 and the shaft portion 6 fitted to each other. Therefore, the inner ring 12 is fitted and held on the shaft part 6 so as to be rotatable relative to the shaft part 6, and the shaft part 6 is rotatably supported by slippage between the inner ring 12 and the shaft part 6. Even in such a case, a good sliding lubrication state can be obtained between the inner ring 12 and the shaft part 6, and generation of abnormal noise and wear of the shaft part 6 and the inner ring 12 (inner diameter part 14) can be prevented as much as possible. can do. Further, since the inner diameter portion 14 is made of sintered metal, it has particularly high wear resistance.

特に本実施形態では、内径部１４の内部気孔に含浸させる潤滑流体をグリースとしていることから、潤滑流体の飛散による周辺環境の汚染や油膜切れを可及的に防止することができることに加え、内径部１４の内周面に封孔処理（目潰し処理）が施されていることから、油膜剛性を一層高めることができる。従って、軸部６を上記態様で安定的に支持することが可能となる。   In particular, in this embodiment, since the lubricating fluid impregnated in the internal pores of the inner diameter portion 14 is grease, in addition to being able to prevent contamination of the surrounding environment and oil film breakage due to scattering of the lubricating fluid as much as possible, Since the sealing process (crushing process) is performed on the inner peripheral surface of the portion 14, the oil film rigidity can be further increased. Therefore, the shaft portion 6 can be stably supported in the above manner.

一方、内輪１２と軸部６との間に両者が一体回転し得る程度の動摩擦力が生じる場合には、転がり軸受１０の本来的な機能、すなわち内輪１２と外輪１１とが相対回転することにより、各ローラの軸部６は現像槽５に対して回転自在に支持される。以上のように、本発明に係る転がり軸受１０は、転がり軸受としての本来的な機能に加え、すべり軸受としての機能をも具備するものであるから、異音や摩耗の問題が可及的に防止されて極めて長寿命であると共に、広範な用途に使用可能である。   On the other hand, when a dynamic friction force is generated between the inner ring 12 and the shaft portion 6 so that both can rotate integrally, the original function of the rolling bearing 10, that is, the inner ring 12 and the outer ring 11 are relatively rotated. The shaft portion 6 of each roller is rotatably supported with respect to the developing tank 5. As described above, since the rolling bearing 10 according to the present invention has a function as a sliding bearing in addition to the original function as a rolling bearing, problems of abnormal noise and wear are as much as possible. It is prevented and has a very long life and can be used in a wide range of applications.

また、本発明に係る転がり軸受１０は、前述のとおり、内輪１２が、軸部６に対して相対回転可能に軸部６の外周に嵌合保持されていることから、各ローラの軸部６の挿入性、さらに言えば各種ローラ２の組付け性および交換性（メンテナンス性）を、従来の転がり軸受に比べて高めることができる。   Further, as described above, the rolling bearing 10 according to the present invention has the inner ring 12 fitted and held on the outer periphery of the shaft portion 6 so as to be relatively rotatable with respect to the shaft portion 6. In addition, the assembling property and exchangeability (maintenance property) of the various rollers 2 can be improved as compared with the conventional rolling bearing.

なお、内輪１２を構成する内径部１４の厚みが外径部１３の厚みに比して過大となり、転動体１５の転送面１２ａ１を有する外径部１３に必要とされる機械的特性（強度等）が不十分となると、外径部１３（内輪１２）に転がり荷重が負荷された場合等に変形が生じ、転がり軸受として機能しなくなる事態を招くおそれがある。かかる事態を防止するには、例えば、内輪１２の内径寸法に応じて内径部１４の厚みを調整するようにすれば良い。具体的に述べると、例えば内輪１２の内径がφ３以下の場合、内径部１４の厚みを０．５ｍｍ程度とすれば良い。この他、内輪１２の内径がφ３よりも大きくφ８以下の場合には内径部１４の厚みを１．０ｍｍ程度に、内輪１２の内径がφ８よりも大きくφ１５以下の場合には内径部１４の厚みを１．５ｍｍ程度に、また内輪１２の内径がφ１５よりも大きい場合には内径部１４の厚みを２．０ｍｍ以上とすれば良い。なお、これらの値はあくまでも目安であり、選択する材料等によって適宜変更可能である。   The inner diameter portion 14 constituting the inner ring 12 is excessively thicker than the outer diameter portion 13, and mechanical characteristics (strength etc.) required for the outer diameter portion 13 having the transfer surface 12 a 1 of the rolling element 15. ) Is insufficient, deformation may occur when a rolling load is applied to the outer diameter portion 13 (inner ring 12), which may cause a situation where the bearing does not function as a rolling bearing. In order to prevent such a situation, for example, the thickness of the inner diameter portion 14 may be adjusted according to the inner diameter dimension of the inner ring 12. Specifically, for example, when the inner diameter of the inner ring 12 is φ3 or less, the thickness of the inner diameter portion 14 may be about 0.5 mm. In addition, when the inner diameter of the inner ring 12 is larger than φ3 and smaller than or equal to φ8, the thickness of the inner diameter portion 14 is about 1.0 mm. When the inner diameter of the inner ring 12 is larger than φ8 and smaller than or equal to φ15, the thickness of the inner diameter portion 14 is increased. When the inner ring 12 has an inner diameter larger than φ15, the inner diameter portion 14 may be made to have a thickness of 2.0 mm or more. Note that these values are only a guide and can be appropriately changed depending on the material to be selected.

図３は、本発明の第２実施形態に係る転がり軸受１０を概念的に示す断面図である。同図に示す転がり軸受１０は、内輪１２（内径部１４）の内周両端に、内径部１４の軸方向中央部から離反する方向に内径寸法が漸次拡大するテーパ面状あるいは凸円弧面状（図示例はテーパ面状）の逃げ部１２ｃ，１２ｃを設けた点において、図２に示す転がり軸受１０と構成を異にする。かかる構成とすれば、内輪１２と軸部６の間の揺動変位（調心移動）を許容することができ、各ローラ２，３，４の軸部６を一層安定的に支持することが可能となる。また、軸部６との接触面積が減少するため、内径部１２あるいは軸部６の摩耗を効果的に抑制あるいは防止することができる。なお、これ以外の構成については、図２に示す第１実施形態と実質的に同一であるので、共通の参照番号を付して重複説明を省略する。   FIG. 3 is a sectional view conceptually showing the rolling bearing 10 according to the second embodiment of the present invention. The rolling bearing 10 shown in the figure has a tapered surface shape or a convex arc surface shape in which the inner diameter dimension gradually increases in the direction away from the axial central portion of the inner diameter portion 14 at both inner peripheral ends of the inner ring 12 (inner diameter portion 14). The configuration of the rolling bearing 10 shown in FIG. 2 is different from that of the rolling bearing 10 shown in FIG. With such a configuration, swinging displacement (alignment movement) between the inner ring 12 and the shaft portion 6 can be allowed, and the shaft portions 6 of the rollers 2, 3, and 4 can be supported more stably. It becomes possible. Further, since the contact area with the shaft portion 6 is reduced, wear of the inner diameter portion 12 or the shaft portion 6 can be effectively suppressed or prevented. Since the configuration other than this is substantially the same as that of the first embodiment shown in FIG. 2, common reference numerals are given and redundant description is omitted.

以上では、内輪１２の内径部１４を焼結金属の多孔質体で形成した転がり軸受１０について説明を行ったが、内輪１２の内径部１４は、その他の多孔質体、例えば多孔質樹脂で形成することも可能である。多孔質樹脂は焼結金属に比べ耐摩耗性の面では若干劣るものの、製造コスト面では有利である。そのため、内径部１４を焼結金属で形成しなければならない程の耐摩耗性が要求されない用途であれば、内径部１４を多孔質樹脂で形成して、転がり軸受１０の低コスト化を図ることも可能である。また、内輪１２の内径部１４は、セラミックスで形成することも可能である。   The rolling bearing 10 in which the inner diameter portion 14 of the inner ring 12 is formed of a sintered metal porous body has been described above. However, the inner diameter portion 14 of the inner ring 12 is formed of another porous body, for example, a porous resin. It is also possible to do. The porous resin is slightly inferior in wear resistance as compared with the sintered metal, but is advantageous in terms of production cost. Therefore, if the wear resistance is not required so that the inner diameter portion 14 must be formed of sintered metal, the inner diameter portion 14 is formed of a porous resin to reduce the cost of the rolling bearing 10. Is also possible. Further, the inner diameter portion 14 of the inner ring 12 can be formed of ceramics.

図４は、本発明の第３実施形態に係る転がり軸受１０を概念的に示す断面図（軸直交断面図）である。同図に示す転がり軸受１０では、内輪１２が、図２および図３に示す内輪１２のような外径部および内径部の区別がなく金属材料で形成された一体品とされ、ローラの軸部６と周方向で相互に係合する係合部１６を有する点において以上に示す転がり軸受１０と構成を異にする。図示例では、内輪１２の内周面１２ｂの周方向一部領域に形成したストレートな平坦面でもって係合部１６が構成される。また、内輪１２は、嵌め合い隙間がゼロ、あるいは正の値でもって軸部６の外周に嵌合される。もちろんこの場合、軸部６のうち、少なくとも内輪１２の内周に嵌合される軸方向領域における外周面形状は、係合部１６の形態に適合したものとされる。以上のような構成とすれば、内輪１２に対する軸部６の挿入性（組付け性やメンテナンス性）を良好なものとしつつ、内輪１２と軸部６とが周方向ですべることによって生じる弊害、すなわち異音や摩耗の問題が生じるのを可及的に防止することができる。   FIG. 4 is a sectional view (axial orthogonal sectional view) conceptually showing the rolling bearing 10 according to the third embodiment of the present invention. In the rolling bearing 10 shown in the figure, the inner ring 12 is an integral part made of a metal material without distinction between the outer diameter part and the inner diameter part like the inner ring 12 shown in FIGS. 2 and 3, and the shaft part of the roller. 6 is different from the above-described rolling bearing 10 in that it has engaging portions 16 that engage with each other in the circumferential direction. In the illustrated example, the engaging portion 16 is configured by a straight flat surface formed in a partial region in the circumferential direction of the inner peripheral surface 12 b of the inner ring 12. Further, the inner ring 12 is fitted to the outer periphery of the shaft portion 6 with a fitting gap of zero or a positive value. Of course, in this case, at least the outer peripheral surface shape in the axial region fitted to the inner periphery of the inner ring 12 in the shaft portion 6 is adapted to the form of the engaging portion 16. With the above configuration, the adverse effect caused by sliding the inner ring 12 and the shaft portion 6 in the circumferential direction while improving the insertability (assembling performance and maintainability) of the shaft portion 6 with respect to the inner ring 12, That is, it is possible to prevent the occurrence of abnormal noise and wear problems as much as possible.

なお、図４では、内輪１２内周面の周方向一部領域に設けたストレートな平坦面でもって係合部１６を構成したが、内輪１２と軸部６の間の周方向相対移動を規制できるのであれば係合部１６の形態は任意である。例えば、係合部１６は、内輪１２の内周面の周方向一部領域に、他所よりも内径側に突出した凸状部を形成することによって構成することも可能である。   In FIG. 4, the engaging portion 16 is configured by a straight flat surface provided in a partial region in the circumferential direction of the inner circumferential surface of the inner ring 12, but the circumferential relative movement between the inner ring 12 and the shaft portion 6 is restricted. If possible, the form of the engaging portion 16 is arbitrary. For example, the engaging portion 16 can also be configured by forming a convex portion that protrudes toward the inner diameter side from other places in a partial region of the inner peripheral surface of the inner ring 12 in the circumferential direction.

以上では、本発明に係る転がり軸受１０を、画像形成装置のうち、現像装置１に装備されるローラ状回転体（トナー攪拌ローラ２，３や現像ローラ４）の軸部支持用に用いた場合について説明を行ったが、本発明に係る転がり軸受１０は、画像形成装置に装備されるその他のローラ状回転体、例えば、現像した画像を出力紙に転写するための転写ローラや、転写された画像を出力紙に定着させるための定着ローラ等の軸部支持用に用いることが可能であるのはもちろんである。   In the above, when the rolling bearing 10 according to the present invention is used for supporting a shaft portion of a roller-like rotating body (toner stirring rollers 2 and 3 and developing roller 4) provided in the developing device 1 in the image forming apparatus. Although the rolling bearing 10 according to the present invention has been described, other roller-like rotating bodies equipped in the image forming apparatus, for example, a transfer roller for transferring a developed image to output paper, Of course, it can be used for supporting a shaft portion of a fixing roller or the like for fixing an image on output paper.

本発明に係る転がり軸受を組み込んだ現像装置の要部を概念的に示す断面図である。It is sectional drawing which shows notionally the principal part of the developing device incorporating the rolling bearing which concerns on this invention. 本発明の第１実施形態に係る転がり軸受を概念的に示す軸平行断面図である。1 is an axial parallel sectional view conceptually showing a rolling bearing according to a first embodiment of the present invention. 本発明の第２実施形態に係る転がり軸受を概念的に示す軸平行断面図である。It is an axial parallel sectional view which shows notionally the rolling bearing which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係る転がり軸受を概念的に示す軸直交断面図である。It is an axial orthogonal sectional view which shows notionally the rolling bearing which concerns on 3rd Embodiment of this invention.

符号の説明Explanation of symbols

１ 現像装置
２，３ トナー攪拌ローラ
４ 現像ローラ
５ 現像槽
６ 軸部
７ トナー（現像剤）
８ シール部材
１０ 転がり軸受
１１ 外輪
１２ 内輪
１２ａ１ 転送面
１３ 外径部
１４ 内径部
１５ 転動体
１６ 係合部 DESCRIPTION OF SYMBOLS 1 Developing device 2, 3 Toner stirring roller 4 Developing roller 5 Developing tank 6 Shaft part 7 Toner (developer)
8 Seal member 10 Rolling bearing 11 Outer ring 12 Inner ring 12a1 Transfer surface 13 Outer diameter part 14 Inner diameter part 15 Rolling element 16 Engagement part

Claims (6)

画像形成装置に組み込まれるローラ状回転体を支持するための転がり軸受であって、静止部材に固定される外輪と、該外輪の内周に組み込まれた複数の転動体と、前記ローラ状回転体の軸部の外周に嵌合され、前記転動体を介して前記外輪に対して相対回転する内輪とを備えるものにおいて、
前記内輪が、前記転動体の転送面を有する外径部と、内部気孔に潤滑流体を含浸させた多孔質体からなる内径部とを有し、かつ、前記軸部に対して相対回転可能に前記軸部の外周に嵌合されることを特徴とする画像形成装置用転がり軸受。 A rolling bearing for supporting a roller-like rotating body incorporated in an image forming apparatus, an outer ring fixed to a stationary member, a plurality of rolling elements incorporated on the inner periphery of the outer ring, and the roller-like rotating body And an inner ring that is fitted to the outer periphery of the shaft part and rotates relative to the outer ring via the rolling element,
The inner ring has an outer diameter portion having a transfer surface of the rolling element, and an inner diameter portion made of a porous body in which internal pores are impregnated with a lubricating fluid, and is rotatable relative to the shaft portion. A rolling bearing for an image forming apparatus, wherein the rolling bearing is fitted on an outer periphery of the shaft portion. 前記潤滑流体が、グリースである請求項１に記載の画像形成装置用転がり軸受。   The rolling bearing for an image forming apparatus according to claim 1, wherein the lubricating fluid is grease. 前記内径部のうち、少なくとも前記軸部との接触領域に封孔処理が施された請求項１又は２に記載の画像形成装置用転がり軸受。   The rolling bearing for an image forming apparatus according to claim 1, wherein a sealing process is performed on at least a contact region of the inner diameter portion with the shaft portion. 前記内径部の内周両端に、前記内径部の軸方向中央部から離反する方向に内径寸法が漸次拡大する逃げ部が設けられた請求項１〜３の何れかに記載の画像形成装置用転がり軸受。   The rolling for an image forming apparatus according to any one of claims 1 to 3, wherein relief portions whose inner diameter dimension gradually increases in a direction away from an axial central portion of the inner diameter portion are provided at both inner peripheral ends of the inner diameter portion. bearing. 前記内径部が、アルミ青銅を主成分とする原料粉を用いて成形された焼結金属の多孔質体である請求項１〜４の何れかに記載の画像形成装置用転がり軸受。   The rolling bearing for an image forming apparatus according to any one of claims 1 to 4, wherein the inner diameter portion is a sintered metal porous body formed using a raw material powder mainly composed of aluminum bronze. 画像形成装置に組み込まれるローラ状回転体を支持するための転がり軸受であって、静止部材に保持される外輪と、該外輪の内周に組み込まれた複数の転動体と、前記ローラ状回転体の軸部の外周に嵌合され、前記転動体を介して前記外輪に対して相対回転する内輪とを備えるものにおいて、
前記内輪が、前記軸部と周方向で相互に係合する係合部を有する画像形成装置用転がり軸受。 A rolling bearing for supporting a roller-like rotating body incorporated in an image forming apparatus, an outer ring held by a stationary member, a plurality of rolling elements incorporated on the inner periphery of the outer ring, and the roller-like rotating body And an inner ring that is fitted to the outer periphery of the shaft part and rotates relative to the outer ring via the rolling element,
A rolling bearing for an image forming apparatus, wherein the inner ring includes an engaging portion that engages with the shaft portion in the circumferential direction.
JP2008071766A 2008-03-19 2008-03-19 Roller bearing for image formation device Withdrawn JP2009228700A (en)

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