JP4989130B2 - Rotating member support structure of fixing device - Google Patents
Rotating member support structure of fixing device Download PDFInfo
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- JP4989130B2 JP4989130B2 JP2006181712A JP2006181712A JP4989130B2 JP 4989130 B2 JP4989130 B2 JP 4989130B2 JP 2006181712 A JP2006181712 A JP 2006181712A JP 2006181712 A JP2006181712 A JP 2006181712A JP 4989130 B2 JP4989130 B2 JP 4989130B2
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- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 2
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 claims description 2
- 230000007774 longterm Effects 0.000 abstract 1
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Landscapes
- Fixing For Electrophotography (AREA)
- Sliding-Contact Bearings (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Mounting Of Bearings Or Others (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
本発明は、事務機器用定着装置の定着ローラ、加圧ローラ等の回転部材の軸部を、すきま嵌めで嵌合した転がり軸受により回転自在に支持する回転部材支持構造に関し、特に嵌め合い部における異音発生を防止する構造に関する。 The present invention relates to a rotating member support structure in which a shaft portion of a rotating member such as a fixing roller and a pressure roller of a fixing device for office equipment is rotatably supported by a rolling bearing fitted with a clearance fit, particularly in a fitting portion. The present invention relates to a structure for preventing the generation of abnormal noise.
複写機やプリンタ等の事務機器に組み込まれる定着ローラや加圧ローラ等の回転部材は、小型化や構造簡略化等による組み立て性の問題から、その軸部（シャフト）が転がり軸受の内外輪の一方の軌道輪にすきま嵌め（ルーズ嵌め合い）で嵌合されるものが多い。このため、使用条件によっては、すきま嵌めで嵌合される軸部と軌道輪との間にクリープが生じる恐れがある。従来、このクリープによる嵌合部の摩耗を防止するために、軌道輪の嵌合部に酸化膜を形成した転がり軸受がある（例えば、特許文献１参照）。また、定着ローラ支持構造面からの改善方法として、定着ローラ表面の軸受取り付け部分にフッ素樹脂被膜を形成したもの（特許文献２参照）等がある。特許文献１に記載されたものでは、熱サイクルを受ける定着ローラを支持する転がり軸受に適用する場合に、酸化膜が結露による発錆を防止する効果もあるとしている。
また、この回転部材の軸部と軸受とのすきま嵌めが原因で、印刷時に嵌め合い部において鳴き音（コツコツ音）等の異音が発生するという問題がある。従来は、嵌め合い部へのグリース塗布や、シャフトへの圧入により異音発生防止を図っている。
Rotating members such as fixing rollers and pressure rollers incorporated in office machines such as copiers and printers have their shaft parts (shafts) of the inner and outer rings of rolling bearings due to problems of assembly due to downsizing and simplification of the structure. Many of them are fitted to one of the race rings by a clearance fit (loose fit). For this reason, depending on use conditions, there is a possibility that creep may occur between the shaft portion fitted by clearance fitting and the race. Conventionally, in order to prevent wear of the fitting portion due to creep, there is a rolling bearing in which an oxide film is formed on the fitting portion of the race (see, for example, Patent Document 1). Further, as an improvement method from the surface of the fixing roller support structure, there is a method in which a fluororesin coating is formed on a bearing mounting portion on the surface of the fixing roller (see Patent Document 2). In what is described in Patent Document 1, when applied to a rolling bearing that supports a fixing roller that receives a thermal cycle, the oxide film also has an effect of preventing rusting due to condensation.
In addition, due to the clearance fit between the shaft portion of the rotating member and the bearing, there is a problem that abnormal noise such as a squealing sound is generated at the fitting portion during printing. Conventionally, the generation of abnormal noise is prevented by applying grease to the fitting portion or press-fitting the shaft.
一方、印刷用紙にトナーを熱と圧力で定着させる複写機やプリンタの定着ローラには、鋼やアルミニウム等の金属材料で中空に形成されて、内側から電磁誘導加熱によって加熱されるＩＨ(Induction Heating)方式のものがある。このような定着ローラでは、電磁誘導で発生する内部電流（電磁波ノイズ）によってローラが帯電し印刷物の品質が劣化するので、ローラを接地して帯電した電気を逃がすため、従来は例えば、軸部を支持する軸受として導電性を有するものを採用し該軸受を介してローラを接地している。 On the other hand, the fixing roller of a copying machine or printer that fixes toner on printing paper with heat and pressure is formed in a hollow with a metal material such as steel or aluminum, and heated by electromagnetic induction heating from the inside. ) Method. In such a fixing roller, since the roller is charged by the internal current (electromagnetic noise) generated by electromagnetic induction and the quality of the printed matter is deteriorated, the charged portion is released by grounding the roller. A bearing having conductivity is adopted as the supporting bearing, and the roller is grounded through the bearing.
また、近年において、定着装置の定着部は、印刷スピードが高速化、高画質化する中で、より早くトナーを紙に定着させる機能と高品位での印刷が要求されている。高速化に伴い温度を上げて紙への定着スピードを上げるため、必然的に周囲温度（軸受も）が上昇する。また、装置の使用期間も延びたことから、これに使用される軸受には高温長寿命が要求されている。このような定着部および軸受の温度上昇に伴い、上述した嵌め合い部での異音がより発生しやすくなっている。 In recent years, the fixing unit of the fixing device is required to have a function of fixing toner to paper and high-quality printing faster as printing speed increases and image quality increases. As the speed increases, the temperature is raised to increase the fixing speed to the paper, which inevitably increases the ambient temperature (including the bearing). In addition, since the service life of the device has been extended, the bearing used for this purpose is required to have a high temperature and a long life. With such a rise in the temperature of the fixing portion and the bearing, abnormal noise at the fitting portion described above is more likely to occur.
しかしながら、異音を防止するために回転部材の軸部を軸受に圧入する場合では、締まり嵌めのため異音防止には効果があるが、組み立て作業性が著しく低下するという問題がある。
これに対し、嵌め合い部にグリースを塗布する場合では、組み立て作業性はそれほど低下しないが、定着部は高温となるためにグリースの経時劣化（油分減少、枯渇）により時間経過とともに異音やクリープが発生するという問題がある。また、塗布したグリースが周囲へ飛散して周辺部位を汚染するおそれがある。
また、導電性が必要な場合では、軸受に導電性グリースを封入するとともに、軸受内径面−シャフト間にも導電性グリースを塗布していたが、この場合も上記同様に導電性グリースの経時劣化により異音やクリープが発生し、さらにアース性能も劣化するため、印刷物の品質が低下するという問題がある。
However, in the case where the shaft portion of the rotating member is press-fitted into the bearing in order to prevent abnormal noise, it is effective in preventing abnormal noise due to the interference fit, but there is a problem that the assembly workability is remarkably lowered.
On the other hand, when grease is applied to the mating part, the assembly workability does not decrease so much, but the fixing part becomes hot, so abnormal noise and creep over time due to deterioration of grease over time (decrease in oil content and depletion) There is a problem that occurs. In addition, the applied grease may be scattered to the surrounding area and contaminate the surrounding area.
When electrical conductivity is required, conductive grease is sealed in the bearing, and conductive grease is also applied between the bearing inner surface and the shaft. Causes abnormal noise and creep, and further deteriorates the grounding performance, resulting in a problem that the quality of printed matter is lowered.
また、特許文献１に記載された軌道輪の嵌合部に酸化膜を形成した転がり軸受は、嵌合部での摩耗は防止できるが、動摩擦係数が大きく異音が発生しやすいという問題がある。また、定着ローラのような帯電する回転部材の支持に用いると、酸化膜は導電性がないので、軸受を介して回転部材を接地できず、別途の接地手段が必要となるという問題がある。
特許文献２の定着ローラ支持構造では、摩耗防止および摩耗を原因とする異音発生を防止できる。しかし、近年における定着装置の小型化や構造簡略化等による組み立て性の問題から、すきま嵌めされた軸受により定着ローラを支持する場合では、後述する図３に示す機構等により摩耗を直接原因とする以外の異音発生が起こるおそれがある。
With the fixing roller support structure of Patent Document 2, it is possible to prevent wear and prevent abnormal noise from being caused by wear. However, due to the problem of assembling due to downsizing and simplification of the structure of the fixing device in recent years, when the fixing roller is supported by a clearance-fitted bearing, wear is directly caused by the mechanism shown in FIG. There is a risk that abnormal noise will occur.
本発明はこのような問題に対処するためになされたものであり、定着装置における回転部材の軸部を、該軸部にすきま嵌めで嵌合した転がり軸受により回転自在に支持する構造において、クリープや異音を長期間にわたり防止できるとともに、必要に応じて別途の接地手段を不要とする定着装置の回転部材支持構造を提供することを目的とする。 The present invention has been made to cope with such a problem. In a structure in which a shaft portion of a rotating member in a fixing device is rotatably supported by a rolling bearing fitted to the shaft portion by a clearance fit, a creep is provided. Another object of the present invention is to provide a rotating member support structure for a fixing device that can prevent noise and abnormal noise over a long period of time and does not require a separate grounding means as required.
本発明の回転部材支持構造は、定着装置における回転部材の軸部を、該軸部にすきま嵌めで嵌合した軸受により回転自在に支持する回転部材支持構造であって、上記回転部材の軸部は、少なくとも上記軸受との接触部位に低摩擦摺動性を有する被膜が形成されてなり、上記被膜は厚みが 2〜10μmであり、該被膜と上記軸受との動摩擦係数が 0.2 以下であることを特徴とする。 The rotating member support structure of the present invention is a rotating member support structure in which the shaft portion of the rotating member in the fixing device is rotatably supported by a bearing fitted to the shaft portion by a clearance fit. Is formed with a coating having a low friction sliding property at least at the contact portion with the bearing, the coating has a thickness of 2 to 10 μm, and the dynamic friction coefficient between the coating and the bearing is 0.2 or less. It is characterized by.
上記被膜が、ポリテトラフルオロエチレン（以下、ＰＴＦＥと記す）被膜、二硫化モリブデン（以下、ＭｏＳ2と記す）被膜、または二硫化タングステン（以下、ＷＳ2と記す）被膜であることを特徴とする。 The film is a polytetrafluoroethylene (hereinafter referred to as PTFE) film, a molybdenum disulfide (hereinafter referred to as MoS 2 ) film, or a tungsten disulfide (hereinafter referred to as WS 2 ) film. .
上記被膜が導電性を有する被膜であることを特徴とする。該被膜が、ニッケル−ポリテトラフルオロエチレン（以下、Ｎｉ−ＰＴＦＥと記す）複合被膜、またはグラファイト被膜であることを特徴とする。 The film is a conductive film. The film is a nickel-polytetrafluoroethylene (hereinafter referred to as Ni-PTFE) composite film or a graphite film.
上記軸受に 220Ｎのラジアル荷重を付加しつつ、上記回転部材を130rpmで 500 時間回転させたときの、上記被膜と上記軸受との動摩擦係数が 0.2 以下であることを特徴とする。 The dynamic friction coefficient between the coating and the bearing is 0.2 or less when the rotating member is rotated at 130 rpm for 500 hours while applying a radial load of 220 N to the bearing.
上記回転部材が、印刷用紙にトナーを定着させるための、ヒータが内蔵された定着ローラであることを特徴とする。 The rotating member is a fixing roller with a built-in heater for fixing the toner on the printing paper.
本発明の回転部材支持構造は、すきま嵌めで嵌合した軸受により回転自在に支持される回転部材の軸部に、低摩擦摺動性を有する被膜として、厚みが 2〜10μmであり、該被膜と軸受との動摩擦係数が 0.2 以下である被膜を形成したので、嵌め合い面における動摩擦係数が長期間（例えば、500時間）にわたり低位安定し、クリープや異音を防止できる。また、被膜形成により嵌め合い面におけるグリース塗布が避けられるので、周囲へのグリース飛散による汚染が防止できる。
また、定着装置の小型化や、従来行なっていたグリース塗布、シャフトへの圧入等の異音およびクリープ防止対策の廃止に貢献できる。
The rotating member support structure of the present invention has a thickness of 2 to 10 μm as a coating having low friction sliding property on the shaft portion of the rotating member that is rotatably supported by a bearing fitted with a clearance fit. Since the film with a dynamic friction coefficient of 0.2 or less between the bearing and the bearing is formed, the dynamic friction coefficient on the mating surface is stabilized at a low level for a long period of time (for example, 500 hours), and creep and noise can be prevented. Further, since the application of grease on the mating surfaces can be avoided by forming a film, contamination due to grease scattering to the surroundings can be prevented.
In addition, it can contribute to the miniaturization of the fixing device and the abolition of anti-noise and creep prevention measures such as grease application and press-fitting to the shaft, which have been conventionally performed.
上記被膜は、ＰＴＦＥ被膜、ＭｏＳ2被膜、またはＷＳ2被膜であるので、酸化膜と比較して嵌め合い面における動摩擦係数が小さく異音が発生しにくい。
また上記被膜は、Ｎｉ−ＰＴＦＥ複合被膜やグラファイト被膜等の導電性を有する被膜であるので、例えば軸受内に導電性を有するグリースを封入することで支持構造自体がアース機構を担うことができ、別途の接地手段を不要とできる。
Since the coating is a PTFE coating, a MoS 2 coating, or a WS 2 coating, the dynamic friction coefficient on the mating surface is small compared to the oxide film, and noise is less likely to occur.
In addition, since the coating is a conductive coating such as a Ni-PTFE composite coating or a graphite coating, the support structure itself can serve as a ground mechanism by encapsulating conductive grease in the bearing, for example. Separate grounding means can be dispensed with.
定着装置の構成は感光→搬送→現像→定着→排出となっており、定着部は２本の中空ゴムローラ (芯金にアルミや鋼材を使用)に温度(２００℃程度)とそれを支持する軸受とヒータで構成される。通常、ローラは中空となっているため、その中にヒータを通してローラ内部から直接加熱を行なっている。現像部から出てきた紙にトナーを定着させるために、上記温度のほかに圧力（９８Ｎ程度）をかけてトナーを紙に定着させる。
定着装置運転時において、回転部材の軸部と軸受との間、すなわち嵌め合い部において鳴き音等の異音が発生する機構を図３を参照して説明する。図３は、転がり軸受の内輪内径面に、定着ローラのシャフト（軸部）がすきま嵌めで嵌合されている場合の断面図である。図３（ａ）は嵌め合い部に温度のみがかかる場合を、図３（ｂ）および図３（ｃ）は嵌め合い部に温度と荷重（圧力）がかかる場合をそれぞれ示す。
図３（ａ）に示すように、温度上昇によりシャフトが熱膨張し、軸受内輪もシャフトと一緒に移動する(接触面の動摩擦係数が大きいため)。
図３（ｂ）に示すように、ラジアル荷重負荷によりシャフトがベンディング（湾曲）する。図中においてＦｒは軸受にかかるラジアル方向の力を、Ｆａは軸受にかかるアキシャル方向の力をそれぞれ示す。ここで、Ｆｒ＜Ｆａの場合は軸受内輪の姿勢は保たれる。
図３（ｃ）に示すように、シャフトと定着ローラ外径の芯ずれ（偏心）により、Ｆｒが変化する。Ｆｒ＞Ｆａの場合、軸受の内輪姿勢が崩れる。軸受姿勢が元に戻る時に、シャフトを叩き鳴き音が発生する。
以上の機構において、シャフトと軸受との嵌め合い面における動摩擦係数が十分に小さい場合ではＦｒ＜Ｆａとなり、軸受の姿勢を保つことができる。
本発明では回転部材の軸部表面に所定の特性を有する被膜を形成して、定着装置に要求される使用耐久期間にわたり、嵌め合い面での動摩擦係数を低く維持することで、鳴き音を該耐久期間にわたり防止できることを見出した。本発明はこのような知見に基づくものである。
The structure of the fixing device is photosensitive → conveyance → development → fixing → discharge. The fixing unit consists of two hollow rubber rollers (aluminum or steel is used for the core metal), temperature (about 200 ° C) and a bearing that supports it. And a heater. Usually, since the roller is hollow, it is directly heated from inside the roller through a heater. In order to fix the toner on the paper that has come out of the developing unit, in addition to the above temperature, pressure (about 98 N) is applied to fix the toner on the paper.
A mechanism for generating abnormal noise such as squealing between the shaft portion of the rotating member and the bearing, that is, the fitting portion, during operation of the fixing device will be described with reference to FIG. FIG. 3 is a cross-sectional view when the shaft (shaft portion) of the fixing roller is fitted to the inner ring inner surface of the rolling bearing with a clearance fit. 3A shows a case where only the temperature is applied to the fitting portion, and FIGS. 3B and 3C show a case where temperature and load (pressure) are applied to the fitting portion.
As shown in FIG. 3A, the shaft thermally expands due to the temperature rise, and the bearing inner ring moves together with the shaft (because the dynamic friction coefficient of the contact surface is large).
As shown in FIG. 3B, the shaft bends (curves) due to the radial load. In the figure, Fr represents the radial force applied to the bearing, and Fa represents the axial force applied to the bearing. Here, when Fr <Fa, the posture of the bearing inner ring is maintained.
As shown in FIG. 3C, Fr changes due to misalignment (eccentricity) between the shaft and the outer diameter of the fixing roller. When Fr> Fa, the inner ring posture of the bearing is broken. When the bearing posture returns to the original position, a squeak noise is generated.
In the above mechanism, when the dynamic friction coefficient on the fitting surface between the shaft and the bearing is sufficiently small, Fr <Fa, and the bearing posture can be maintained.
In the present invention, a coating film having predetermined characteristics is formed on the surface of the shaft portion of the rotating member, and the squeal noise is reduced by maintaining a low coefficient of dynamic friction on the mating surface over the service life required for the fixing device. It was found that it can be prevented over the durability period. The present invention is based on such knowledge.
本発明の一実施例に係る回転部材支持構造を図１および図２に基づいて説明する。図１は深溝玉軸受を利用した定着装置の回転部材支持構造の縦断面図を、図２は図１における支持構造部分の拡大図をそれぞれ示す。
定着ローラ９はアルミニウムで中空に形成され、中空部に配設された電磁誘導方式の加熱ヒータ１０によって200℃程度まで加熱されるようになっており、電磁誘導で生じる内部電流によって帯電する。定着ローラ９の両端の軸部９ａは深溝玉軸受１の内輪２の内径面にすきま嵌めで嵌合され、深溝玉軸受１の外輪３が定着装置のフレーム１１に固定されている。本発明では、軸部９ａに被膜８が形成されているので、嵌め合い面においてグリースを塗布する必要がない。
A rotating member support structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of a rotating member support structure of a fixing device using a deep groove ball bearing, and FIG. 2 is an enlarged view of a support structure portion in FIG.
The fixing roller 9 is made of aluminum and is heated to about 200 ° C. by an electromagnetic induction heater 10 disposed in the hollow portion, and is charged by an internal current generated by electromagnetic induction. The shaft portions 9a at both ends of the fixing roller 9 are fitted to the inner surface of the inner ring 2 of the deep groove ball bearing 1 by a clearance fit, and the outer ring 3 of the deep groove ball bearing 1 is fixed to the frame 11 of the fixing device. In the present invention, since the coating 8 is formed on the shaft portion 9a, it is not necessary to apply grease on the fitting surface.
図２に示すように、定着ローラ９の両端軸部９ａの表面に低摩擦摺動性を有する被膜８が形成されている。該被膜８を介して深溝玉軸受１の内輪内径面と定着ローラ９の軸部とがすきま嵌めで嵌合されている。
この被膜８は、少なくとも深溝玉軸受１等の軸受との接触部位に形成されていればよく、軸部全体、または、回転部材全体に形成してもよい。
As shown in FIG. 2, a coating 8 having a low friction sliding property is formed on the surfaces of both end shaft portions 9 a of the fixing roller 9. The inner ring inner surface of the deep groove ball bearing 1 and the shaft portion of the fixing roller 9 are fitted with a clearance fit through the coating 8.
The coating 8 only needs to be formed at least in contact with the bearing such as the deep groove ball bearing 1 or the like, and may be formed on the entire shaft portion or the entire rotating member.
定着ローラの加熱ヒータとして上記の電磁誘導方式を用いる等、該定着ローラの支持構造に導電性を必要とする場合では、被膜８として導電性を有するものを採用することで、各軸部９ａが被膜８および深溝玉軸受１を介してフレーム１１に接地され、定着ローラ９に帯電する電気が逃されるように構成できる。 In the case where the support structure of the fixing roller needs to be conductive, such as using the above-described electromagnetic induction system as a heater for the fixing roller, by adopting a conductive film as the coating 8, each shaft portion 9a It can be configured so that the electricity charged to the fixing roller 9 is released by being grounded to the frame 11 via the coating 8 and the deep groove ball bearing 1.
上述した実施形態では、回転部材の軸部が内輪２の内径面に嵌合される場合としたが、本発明の回転部材支持構造は、軸部が外輪３の外径面に嵌合されるものにも適用できる。また、軸受は深溝玉軸受等の転がり軸受に限定されず、すべり軸受であってもよい。
また、本発明の回転部材支持構造は、静電気等によって帯電する定着ローラ以外の回転部材の支持にも使用することができる。
In the embodiment described above, the shaft portion of the rotating member is fitted to the inner diameter surface of the inner ring 2. However, in the rotating member support structure of the present invention, the shaft portion is fitted to the outer diameter surface of the outer ring 3. It can also be applied to things. The bearing is not limited to a rolling bearing such as a deep groove ball bearing, and may be a sliding bearing.
The rotating member support structure of the present invention can also be used to support rotating members other than the fixing roller that is charged by static electricity or the like.
本発明における低摩擦摺動性を有する被膜は、該被膜と軸受との動摩擦係数、すなわち嵌め合い面における動摩擦係数が 0.2 以下となるものであれば採用できる。嵌め合い面における動摩擦係数が0.2をこえると、軸受の内輪姿勢が崩れて（図３（ｃ）参照）、異音（鳴き音）が発生しやすくなる。
このような低摩擦摺動性を有する被膜としては、例えばＰＴＦＥ被膜、ＭｏＳ2被膜、ＷＳ2被膜等が挙げられる。
また、支持構造に導電性を必要とする場合では、低摩擦摺動性と合わせて導電性を有する被膜を使用する。該導電性を有する被膜としては、フッ素樹脂に金属粉を配合した複合被膜や、グラファイト被膜等が挙げられる。また、フッ素樹脂に金属粉を配合した複合被膜としては、ＰＴＦＥ樹脂に金属Ｎｉ粉を配合したＮｉ−ＰＴＦＥ複合被膜が挙げられる。
The coating having a low friction sliding property in the present invention can be adopted as long as the dynamic friction coefficient between the coating and the bearing, that is, the dynamic friction coefficient on the mating surface is 0.2 or less. When the dynamic friction coefficient on the mating surface exceeds 0.2, the inner ring posture of the bearing collapses (see FIG. 3C), and abnormal noise (squeal noise) is likely to occur.
Examples of such a film having a low friction sliding property include a PTFE film, a MoS 2 film, and a WS 2 film.
Moreover, when electroconductivity is required for a support structure, the film which has electroconductivity combined with low friction slidability is used. Examples of the conductive film include a composite film in which a metal powder is blended with a fluororesin, a graphite film, and the like. Moreover, as a composite film which mix | blended the metal powder with the fluororesin, the Ni-PTFE composite film which mix | blended the metal Ni powder with PTFE resin is mentioned.
回転部材の軸部への被膜の形成方法としては、電気めっき、無電解めっき、真空蒸着、イオンプレーティング、スパッタリング等の物理蒸着（ＰＶＤ）、化学蒸着（ＣＶＤ）等、または、樹脂分散液を用いたディッピング、塗布、スプレー噴霧等によるコーティング、その他周知の被膜形成方法を採用できる。
本発明の回転部材支持構造においては、グラファイト被膜、ＭｏＳ2被膜、またはＷＳ2被膜等を形成する場合では、被膜厚さを均一にできることからスパッタリングを採用することが好ましい。また、Ｎｉ−ＰＴＦＥ複合被膜を形成する場合では、被膜厚さを均一にでき寸法精度に優れるとともに、膜中においてＰＴＦＥ粒子を均一に分散できること等から無電解めっきを採用することが好ましい。
As a method for forming a coating on the shaft of the rotating member, electroplating, electroless plating, vacuum deposition, ion plating, physical vapor deposition (PVD) such as sputtering, chemical vapor deposition (CVD), or resin dispersion The used dipping, coating, coating by spraying, etc., and other known film forming methods can be employed.
In the rotating member support structure of the present invention, when a graphite film, MoS 2 film, WS 2 film or the like is formed, it is preferable to employ sputtering because the film thickness can be made uniform. In the case of forming the Ni-PTFE composite coating, it is preferable to employ electroless plating because the film thickness can be made uniform and the dimensional accuracy is excellent, and the PTFE particles can be uniformly dispersed in the film.
本発明における低摩擦摺動性を有する被膜の厚みは、2〜10μmとする。好ましくは、2〜5μmである。被膜の厚みを 2 μm以上とすることで、複写機やプリンタ等の事務機器における実用上の使用条件として、軸受に 220Ｎのラジアル荷重を付加しつつ、定着ローラを130rpmで 500 時間回転させた時点においても、嵌め合い面における動摩擦係数を 0.2 以下に維持でき異音を防止できる。
被膜の厚みが 2 μm未満では、嵌め合い部での金属同士の摺動を十分に防止できずに異音が発生するおそれがある。10μmをこえると、軸受との嵌合精度が低下するとともに、被膜形成コストが高くなる。
In the present invention, the thickness of the coating having low frictional slidability is 2 to 10 μm. Preferably, it is 2-5 micrometers. When the coating thickness is 2 μm or more, as a practical use condition in office equipment such as copiers and printers, when the fixing roller is rotated at 130 rpm for 500 hours while applying a radial load of 220 N to the bearing However, the dynamic friction coefficient on the mating surface can be kept below 0.2 and noise can be prevented.
When the thickness of the coating is less than 2 μm, sliding of metals at the fitting portion cannot be sufficiently prevented, and abnormal noise may be generated. If it exceeds 10 μm, the fitting accuracy with the bearing is lowered, and the film formation cost is increased.
本発明の回転部材支持構造において、回転部材および軸受の材質は特に限定されず周知の材料からなる部材を使用できる。定着ローラは通常、Ａ５０５６、Ａ６０６３等の軽量アルミニウム合金等により、軸受は軸受鋼、ステンレス鋼等によりそれぞれ形成されている。本発明の回転部材支持構造では、回転部材の軸部に上述の被膜を形成するため、軸受と回転部材との材質が、上記いずれの組み合わせであっても、嵌め合い面における動摩擦係数を小さくできる。
また、転がり軸受等の軸受に封入するグリースとしては、一般に軸受に使用されるグリースであれば、特に種類を限定されない。軸受自体に導電性を必要とする場合には、カーボンブラック、荷電性ミクロゲル粒子、グラファイト等の導電剤を配合した導電性グリースを封入することができる。
In the rotating member support structure of the present invention, the materials of the rotating member and the bearing are not particularly limited, and members made of known materials can be used. The fixing roller is usually made of a lightweight aluminum alloy such as A5056 or A6063, and the bearing is made of bearing steel, stainless steel, or the like. In the rotating member support structure of the present invention, since the above-mentioned film is formed on the shaft portion of the rotating member, the dynamic friction coefficient on the fitting surface can be reduced regardless of the combination of the material of the bearing and the rotating member. .
Further, the type of grease to be sealed in a bearing such as a rolling bearing is not particularly limited as long as it is a grease generally used for a bearing. When the bearing itself needs to be conductive, conductive grease containing a conductive agent such as carbon black, charged microgel particles, and graphite can be enclosed.
実施例および比較例として、アルミニウム製回転部材の軸部に被膜を形成し、該軸部に深溝玉軸受をすきま嵌め（すきま100μm）で嵌合して試験用の回転部材支持構造を作製した。各実施例および比較例における被膜種類、膜厚等を表１に示す。なお、Ｎｉ−ＰＴＦＥ複合被膜の組成は、Ｎｉ 82〜86重量％、リン7〜9重量％、ＰＴＦＥ（粒子径1μm以下）7〜9重量％である。 As an example and a comparative example, a coating was formed on a shaft portion of an aluminum rotating member, and a deep groove ball bearing was fitted to the shaft portion by a clearance fit (a clearance of 100 μm) to prepare a test rotating member support structure. Table 1 shows the coating type, film thickness, and the like in each example and comparative example. The composition of the Ni-PTFE composite coating is 82 to 86% by weight of Ni, 7 to 9% by weight of phosphorus, and 7 to 9% by weight of PTFE (particle diameter 1 μm or less).
試験用の回転部材支持構造において、回転部材を 1000 時間回転する試験を行ない、嵌め合い面における初期（運転開始直後）の動摩擦係数、異音発生の時期、および、軸部と軸受間の通電性能を調査した。試験条件および通電条件は以下の通りである。結果を表１に示す。なお、通電性能の調査では、1000時間の試験時間の間、軸部と軸受間の抵抗が200kΩ以下に保持されたものを通電性能が良、抵抗が一度でも200kΩをこえたものを不良とした。
［試験条件］
・軸受寸法：内径 25 mm、外径 37 mm、幅 7 mm
・軸部温度：200 ℃
・軸受荷重：220 N （ラジアル荷重）
・回転速度：130 rpm
・相手材：アルミニウム
［通電条件］
・荷電電圧：30 V
・制御抵抗：300 kΩ （通電測定部と並列に接続）
・サンプリング間隔：1 μs
In the test rotating member support structure, the rotating member was tested to rotate for 1000 hours, the initial dynamic friction coefficient on the mating surface (immediately after the start of operation), the time of occurrence of abnormal noise, and the current-carrying performance between the shaft and the bearing investigated. Test conditions and energization conditions are as follows. The results are shown in Table 1. In the investigation of energization performance, the energization performance was good when the resistance between the shaft and the bearing was maintained at 200 kΩ or less for a test time of 1000 hours, and the resistance exceeding 200 kΩ was judged as poor even once. .
[Test conditions]
・ Bearing dimensions: Inner diameter 25 mm, Outer diameter 37 mm, Width 7 mm
-Shaft temperature: 200 ° C
・ Bearing load: 220 N (radial load)
・ Rotation speed: 130 rpm
-Partner material: Aluminum [energization condition]
・ Charge voltage: 30 V
・ Control resistance: 300 kΩ (connected in parallel with the current measurement unit)
・ Sampling interval: 1 μs
また、実施例２、６、１０、および１４、参考例２、比較例１〜３について、同じ試験条件での嵌め合い面における動摩擦係数の経時変化を測定した。結果を図４に示す。図４において横軸は経過時間（ｈ）、縦軸は動摩擦係数をそれぞれ示す。 Further, with respect to Examples 2 , 6, 10, and 14, Reference Example 2 , and Comparative Examples 1 to 3, the change with time of the dynamic friction coefficient on the mating surfaces under the same test conditions was measured. The results are shown in FIG. In FIG. 4, the horizontal axis represents elapsed time (h), and the vertical axis represents the dynamic friction coefficient.
表１に示すように、各実施例の被膜を形成した軸受では、事務機器等において実用上十分な耐久時間（500時間）にわたり、異音の発生を防止できた。さらに実施例１〜８では良好な通電性能も有していた。また図４に示すように、被膜の厚みを5μmとした実施例２、６、１０、および１４、参考例２では、動摩擦係数を長時間にわたり低位に維持することができ、異音の発生を防止できた。 As shown in Table 1, in the bearing formed with the coating film of each example, it was possible to prevent the generation of abnormal noise over a practically sufficient durability time (500 hours) in office equipment and the like. Further, Examples 1 to 8 also had good energization performance. Further, as shown in FIG. 4, in Examples 2 , 6, 10, and 14, and Reference Example 2 in which the thickness of the coating is 5 μm, the dynamic friction coefficient can be maintained at a low level for a long time, and abnormal noise is generated. I was able to prevent it.
本発明の回転部材支持構造は、鳴き音等の異音を長期間にわたり防止できるので、複写機やプリンタ等の事務機器用定着装置に好適に利用できる。 Since the rotating member support structure of the present invention can prevent abnormal noise such as squealing sound over a long period of time, it can be suitably used for a fixing device for office machines such as copying machines and printers.
１ 深溝玉軸受（転がり軸受）
２ 内輪
３ 外輪
８ 被膜
９ 定着ローラ
９ａ 軸部
１０ 加熱ヒータ
１１ フレーム
1 Deep groove ball bearing (rolling bearing)
2 Inner ring 3 Outer ring 8 Film 9 Fixing roller 9a Shaft portion 10 Heating heater 11 Frame
Claims (2)
前記回転部材が、印刷用紙にトナーを定着させるための、ヒータが内蔵された定着ローラであり、
前記回転部材の軸部は、少なくとも前記軸受との接触部位に低摩擦摺動性を有する被膜が形成されてなり、
前記被膜が、スパッタリング処理により形成された、二硫化モリブデン被膜、二硫化タングステン被膜、もしくはグラファイト被膜、または、無電解めっき処理により形成されたニッケル−ポリテトラフルオロエチレン複合被膜であり、
前記被膜は厚みが 2〜10μmであり、該被膜と前記軸受との動摩擦係数が 0.2 以下であり、
前記回転部材の軸部と前記軸受との嵌め合い部における、軸受姿勢が崩れて戻り該軸部を叩くことで発生する異音を防止することを特徴とする回転部材支持構造。 A rotating member support structure that rotatably supports a shaft portion of a rotating member in a fixing device by a bearing fitted to the shaft portion by a clearance fit,
The rotating member is a fixing roller with a built-in heater for fixing the toner on the printing paper;
The shaft portion of the rotating member is formed with a coating having a low friction sliding property at least at a contact portion with the bearing,
The film is a molybdenum disulfide film, a tungsten disulfide film, or a graphite film formed by a sputtering process, or a nickel-polytetrafluoroethylene composite film formed by an electroless plating process ,
The coating thickness is 2 to 10 [mu] m, the dynamic friction coefficient between the coating film and the bearing Ri der 0.2,
A rotating member support structure characterized in that an abnormal noise generated by hitting the shaft portion when the shaft orientation of the rotating member is fitted back to the bearing is lost .
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| PCT/JP2007/062963 WO2008001831A1 (en) | 2006-06-30 | 2007-06-28 | Rotating member support structure of fixing device and rolling bearing used for the structure |
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