JP2007223600A - Hub unit bearing - Google Patents

Hub unit bearing Download PDF

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JP2007223600A
JP2007223600A JP2007134379A JP2007134379A JP2007223600A JP 2007223600 A JP2007223600 A JP 2007223600A JP 2007134379 A JP2007134379 A JP 2007134379A JP 2007134379 A JP2007134379 A JP 2007134379A JP 2007223600 A JP2007223600 A JP 2007223600A
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hub
coating film
hub unit
unit bearing
outer diameter
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Hiroshi Okuno
浩志 奥野
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NSK Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hub unit bearing having a good coating film on a peripheral surface of a pilot outer diameter part of the hub unit bearing. <P>SOLUTION: The hub 13 is dried after performing degreasing washing in order to remove a fats and oil component and an electrode is attached to the dried hub 13. The pilot outer diameter part 42 is only immersed in an electro-deposition tank developed with a dissociable aqueous solution type coating, a voltage is applied between an electrode provided in the electro-deposition tank and it, and the ionized coating ions are electro-deposited on the peripheral surface of the pilot outer diameter part 42. After completion of electro-deposition of the coating, baking is performed at high temperatures, cooling is performed and the electro-deposition coating is cured to form the coating film. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ハブユニット軸受に係り、詳しくはハブユニット軸受のハブパイロット外径部周面の塗装膜に関する。   The present invention relates to a hub unit bearing, and more particularly to a coating film on a peripheral surface of a hub pilot outer diameter portion of the hub unit bearing.

近年、自動車用アクスル装置等では、部品点数の削減や製品コストの低減等を図るべく、特開２０００−１４２００９号公報（以下、先行技術と記す）等に記載されたように、軸受の構成要素をアクスル装置の構成要素と一体化したいわゆる第３世代のハブユニット軸受が開発されている。先行技術のハブユニット軸受では、複列アンギュラ玉軸受の外輪に懸架装置の取付フランジを形成すると共に、一方の内輪（第１内輪）をハブと一体化し、更に他方の内輪（第２内輪）をハブに形成された内輪保持筒に外嵌・圧入させている。ハブの軸芯には雌スプラインが形成される一方、この雌スプラインにドライブシャフトの雄スプラインが嵌入し、ドライブシャフトからハブ（すなわち、車輪）に駆動力が伝達される。
上述のハブユニット軸受のハブには、ハブにホイールを取り付ける際の中心合わせの目安となるパイロット外径部がホイールを取り付ける側に凸状に設けられている。従来、このパイロット外径部周面には防錆等を目的として黒色塗料が刷毛塗り塗装や吹き付け塗装され焼き付けられて塗装膜を形成していた。 2. Description of the Related Art In recent years, in automobile axle devices and the like, as described in Japanese Patent Application Laid-Open No. 2000-142009 (hereinafter referred to as prior art), etc., in order to reduce the number of parts and product cost, So-called third-generation hub unit bearings have been developed that integrate these with the components of the axle device. In the prior art hub unit bearing, the mounting flange of the suspension device is formed on the outer ring of the double-row angular ball bearing, one inner ring (first inner ring) is integrated with the hub, and the other inner ring (second inner ring) is further integrated. The inner ring holding cylinder formed on the hub is externally fitted and press-fitted. A female spline is formed on the shaft core of the hub, and a male spline of a drive shaft is fitted into the female spline, and a driving force is transmitted from the drive shaft to the hub (that is, a wheel).
The hub of the hub unit bearing described above is provided with a pilot outer diameter portion that is a guide for centering when the wheel is attached to the hub in a convex shape on the side where the wheel is attached. Conventionally, a black paint has been brush-painted, spray-painted and baked on the peripheral surface of the pilot outer diameter portion for the purpose of rust prevention or the like to form a paint film.

しかし、従来の刷毛塗り塗装や吹き付け塗装では、塗装膜が完全に硬化するまでに４〜５日必要であり、塗装膜が完全に硬化するまでの間の取り扱い段階で剥がれ等の問題を生じていた。さらに、塗装膜の硬度が十分でなかったため、傷つき易く、剥がれやすい、また塗装膜を均一に塗布することが難しいと言う問題を生じていた。   However, in conventional brush painting and spray painting, it takes 4 to 5 days for the coating film to be completely cured, causing problems such as peeling at the handling stage until the coating film is completely cured. It was. Furthermore, since the hardness of the coating film was insufficient, there were problems that it was easily damaged and peeled off, and that it was difficult to apply the coating film uniformly.

本発明は、上記状況に鑑みなされたもので、ハブユニット軸受のパイロット外径部周面に優れた塗装膜を有するハブユニット軸受を提供することを目的とする。   The present invention has been made in view of the above situation, and an object of the present invention is to provide a hub unit bearing having an excellent coating film on a peripheral surface of a pilot outer diameter portion of the hub unit bearing.

上述の課題を解決するために、本発明では、駆動力や操舵力をホイールに伝達するハブユニット軸受において、
前記ハブユニット軸受のハブの前記ホイール側に凸状に形成されたパイロット外径部周面に、電着塗装法により塗装膜を形成したことを特徴とするハブユニット軸受を提供する。 In order to solve the above-described problem, in the present invention, in a hub unit bearing that transmits driving force and steering force to a wheel,
There is provided a hub unit bearing characterized in that a coating film is formed by electrodeposition coating on a peripheral surface of a pilot outer diameter portion formed in a convex shape on the wheel side of the hub of the hub unit bearing.

また、前記電着塗装法は、カチオン電着塗装法であることが好ましい。   The electrodeposition coating method is preferably a cationic electrodeposition coating method.

このように、本発明では、ハブユニット軸受のハブのパイロット外径部周面に電着塗装法を用いて塗装膜を形成している。電着塗装膜では、塗装膜の電着が完了して、焼き付け、冷却後は塗料が完全に硬化しているため、灯油・溶剤等が付着しても全く剥がれることがない。また、塗装膜が均一で薄く形成でき、焼き付け、冷却時間も短時間で済む。さらに吹き付け塗装膜に比べ硬度が高く、傷つき難く剥がれにくい塗装膜が得られる。   Thus, in the present invention, the coating film is formed on the peripheral surface of the pilot outer diameter portion of the hub of the hub unit bearing using the electrodeposition coating method. In the case of an electrodeposition coating film, the electrodeposition of the coating film is completed, and after baking and cooling, the coating is completely cured, so even if kerosene / solvent adheres, it does not peel off at all. In addition, the coating film can be formed uniformly and thinly, and baking and cooling time are short. Furthermore, a coating film having a higher hardness than that of the spray coating film, which is hard to be damaged and difficult to peel off can be obtained.

以下、本発明の一実施形態を図面を用いて説明する。
図１は、本発明の一実施形態に係るハブユニット軸受１を示す縦断面図である。
本実施形態は、本発明をＦＦ（フロントエンジン・フロントドライブ）型乗用車における駆動車軸用の第３世代ハブユニット軸受に適用したものである。図１中、符号３で示した部材は複列アンギュラ玉軸受５の外輪であり、その内周側にはそれぞれ軸方向外向きに開いた円弧状断面の第１，第２軌道面７，９が形成されている。外輪３の外周側にはフランジ１１が形成されており、このフランジ１１を介して懸架装置のナックルアーム（不図示）にハブユニット軸受１が結合される。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a hub unit bearing 1 according to an embodiment of the present invention.
In this embodiment, the present invention is applied to a third generation hub unit bearing for a drive axle in an FF (front engine / front drive) type passenger car. In FIG. 1, a member denoted by reference numeral 3 is an outer ring of the double row angular ball bearing 5, and first and second raceway surfaces 7 and 9 having arcuate cross sections opened outward in the axial direction on the inner peripheral side thereof. Is formed. A flange 11 is formed on the outer peripheral side of the outer ring 3, and the hub unit bearing 1 is coupled to a knuckle arm (not shown) of the suspension device via the flange 11.

外輪３の第１軌道面７側にはハブ１３と一体化された第１内輪１５が配置されており、この第１内輪１５の外周側には外輪３の第１軌道面７に対応する内向きに開いた円弧状断面の軌道面１７が形成されている。第１内輪１５の軌道面１７と第１軌道面７との間には多数個の鋼球１９と保持器２１とからなる第１ころ列２３が介装されている。図中、符号２５は内側係止端を示し、符号２７は軸シールを示している。   A first inner ring 15 integrated with the hub 13 is disposed on the first raceway surface 7 side of the outer ring 3, and an inner side corresponding to the first raceway surface 7 of the outer ring 3 is disposed on the outer peripheral side of the first inner ring 15. A raceway surface 17 having an arcuate cross section that opens in the direction is formed. Between the raceway surface 17 of the first inner ring 15 and the first raceway surface 7, a first roller row 23 including a plurality of steel balls 19 and a cage 21 is interposed. In the figure, reference numeral 25 denotes an inner locking end, and reference numeral 27 denotes a shaft seal.

外輪３の第２軌道面９側には第２内輪３１が配置されており、この第２内輪３１の外周側には外輪３の第２軌道面９に対応する内向きに開いた円弧状断面の軌道面３３が形成されている。第２内輪３１の軌道面３３と第２軌道面９との間には多数個の鋼球１９と保持器２１とからなる第２ころ列３５が介装されている。   A second inner ring 31 is disposed on the second raceway surface 9 side of the outer ring 3, and an inwardly open arcuate cross section corresponding to the second raceway surface 9 of the outer ring 3 is disposed on the outer peripheral side of the second inner ring 31. The track surface 33 is formed. Between the raceway surface 33 and the second raceway surface 9 of the second inner ring 31, a second roller row 35 including a plurality of steel balls 19 and a cage 21 is interposed.

第２内輪３１は、ハブ１３の内側に延設された第２内輪保持筒３７に外嵌・圧入され、その内側係止端３９が第１内輪１５の内側係止端２５に当接することによって軸方向に位置決めされると共に、第２内輪保持筒３７の端部に施された揺動加締め４１によってハブ１３に固定・一体化される。図中、符号４３で示した部材は第２内輪３１に外嵌・固着されたエンコーダであり、ナックルアーム（不図示）に固定されたセンサと伴に、図示しない電子制御装置に出力するハブ１３（すなわち、車輪）の回転情報の生成に供される。ハブ１３にはハブボルト４７が植設された車輪取付用フランジ４９が形成されており、この車輪取付用フランジ４９に図示しないホイールが装着される。また、ハブ１３の軸心には雌スプライン５１が形成されている。   The second inner ring 31 is fitted and press-fitted into a second inner ring holding cylinder 37 extending inside the hub 13, and the inner locking end 39 abuts on the inner locking end 25 of the first inner ring 15. While being positioned in the axial direction, it is fixed and integrated with the hub 13 by a swing caulking 41 applied to an end of the second inner ring holding cylinder 37. In the figure, a member denoted by reference numeral 43 is an encoder that is externally fitted and fixed to the second inner ring 31, and a hub 13 that outputs to an electronic control device (not shown) together with a sensor fixed to a knuckle arm (not shown). (Ie, wheel) rotation information is generated. A wheel mounting flange 49 in which a hub bolt 47 is implanted is formed on the hub 13, and a wheel (not shown) is mounted on the wheel mounting flange 49. A female spline 51 is formed at the axial center of the hub 13.

ハブ１３のホイール側には、ホイールセンタの目安となるパイロット外径部４２が設けられている。そして、このパイロット外径部４２の周面には、錆等を防ぐために、例えば黒色の防錆塗装が施されている（図１中、太い実線で示す）。この防錆塗装膜は、電着塗装法によりパイロット外径部４２の周面のみに施されている。   On the wheel side of the hub 13, a pilot outer diameter portion 42 serving as a guide for the wheel center is provided. In order to prevent rust and the like, the peripheral surface of the pilot outer diameter portion 42 is provided with, for example, black rust preventive coating (indicated by a thick solid line in FIG. 1). This rust-proof coating film is applied only to the peripheral surface of the pilot outer diameter portion 42 by an electrodeposition coating method.

以下、本願で用いた電着塗装膜の形成について簡単に説明する。ハブ１３を油脂分を除くため脱脂洗浄等を行った後乾燥する。雌スプライン５１の形成部に塗装膜が付着するのを防ぐキャップ（不図示）を付けた後、この乾燥したハブ１３に電極を付け、パイロット外径部４２の周面部のみを解離可能な水溶液性塗料を展開した電着槽（例えばカップ状の容器）に浸し、電着槽中に設けられた電極との間に電圧を印加し、陽イオンにイオン化された塗料イオンをパイロット外径部４２の周面に電着させる。今回用いた電着装置では、装置を簡略化するため、塗装前のリン酸化処理を省き、部分的な塗装でありながら塗装部分の見切りをよくするため、単純な浸漬ではなく、カップ内へ塗料をポンプで循環させカップからのオーバーフローを一定にすることにより塗装範囲を一定に保っている。これにより塗料液面への波打ちや装置の揺れによる影響を低減している。一例として、塗装膜厚が約１５μｍの場合、電着電圧２００Ｖで電着時間が1分であった。塗装膜の電着終了後、高温で焼付け冷却を行い電着塗装膜を硬化し塗装膜を完成させる。塗装膜の焼付け処理は、通常の加熱処理のほかに、遠赤外線を用いても良い。今回、遠赤外線を用いた場合、塗装後の焼付け時間は約３分程度であった。この間ハブ１３の表面温度は１４０度、ベアリングの内部温度は１００度以下とし、ハブ１３の材料の組織に影響が出ないようにしている。このように遠赤外線を用いた場合には、塗装膜の焼付け温度の制御や冷却時間を短縮できる効果がある。   Hereinafter, the formation of the electrodeposition coating film used in the present application will be briefly described. The hub 13 is dried after degreasing and washing to remove oil and fat. After attaching a cap (not shown) to prevent the coating film from adhering to the formation portion of the female spline 51, an electrode is attached to the dried hub 13 so that only the peripheral surface portion of the pilot outer diameter portion 42 can be dissociated. The electrode is immersed in an electrodeposition tank (for example, a cup-shaped container) in which the paint is spread, and a voltage is applied between the electrode and the electrode provided in the electrodeposition tank. Electrodeposit on the circumference. In the electrodeposition apparatus used this time, in order to simplify the apparatus, the phosphorylation treatment before painting is omitted, and in order to improve the parting off of the painted part even though it is a partial painting, the paint is applied into the cup instead of simple immersion. The coating area is kept constant by circulating the air through the pump and keeping the overflow from the cup constant. As a result, the influence of undulations on the coating liquid surface and shaking of the device is reduced. As an example, when the coating film thickness was about 15 μm, the electrodeposition voltage was 200 V and the electrodeposition time was 1 minute. After electrodeposition of the coating film is completed, the electrodeposition coating film is cured by baking and cooling at a high temperature to complete the coating film. The baking treatment of the coating film may use far infrared rays in addition to the normal heat treatment. This time, when far infrared rays were used, the baking time after painting was about 3 minutes. During this time, the surface temperature of the hub 13 is 140 degrees and the internal temperature of the bearing is 100 degrees or less so that the structure of the material of the hub 13 is not affected. When far-infrared rays are used in this way, there are effects of controlling the baking temperature of the coating film and shortening the cooling time.

上述のようにして作成された電着塗装膜は、従来の刷毛塗り塗装や吹き付け塗装により作成された塗装膜に比べ、塗装膜を薄く、均一に形成することができる。また、この塗装膜は、灯油などの溶剤が付着しても剥がれることがない。さらに、電着塗装膜の硬度も５Ｈ〜７Ｈと吹き付け塗装膜の２Ｈに比べて高く、傷、剥がれ等の危険性が少なくなり、防錆効果を飛躍的に良くすることができる。   The electrodeposition coating film prepared as described above can form a coating film that is thinner and more uniform than a coating film prepared by conventional brush coating or spray coating. In addition, the coating film does not peel off even when a solvent such as kerosene adheres. Furthermore, the hardness of the electrodeposition coating film is 5H to 7H, which is higher than that of the spray coating film 2H, and the risk of scratches, peeling, etc. is reduced, and the rust prevention effect can be greatly improved.

以上で具体的実施形態の説明を終えるが、本発明の態様は上記実施形態に限られるものではない。例えば、塗料の色を黒色として説明したが、黒色に限られるものではなく、解離可能な水溶液性塗料であれば電着塗装可能である。さらに、カチオン（陽イオン）塗料を用いた、カチオン電着塗装法について説明したが、アニオン（陰イオン）塗料を用いた、アニオン電着塗装法でも同様の効果を奏する。また、第１世代、第２世代等の他の世代のハブユニット軸受のパイロット外径部周面の塗装にも適用できることは言うまでもない。   Although description of specific embodiment is finished above, the aspect of the present invention is not limited to the above embodiment. For example, although the color of the paint has been described as black, it is not limited to black, and any water-soluble paint that can be dissociated can be electrodeposited. Furthermore, although the cationic electrodeposition coating method using a cation (cation) paint has been described, the same effect can be obtained by an anion electrodeposition coating method using an anion (anion) paint. Needless to say, the present invention can also be applied to the outer peripheral surface of the pilot outer diameter portion of the hub unit bearing of other generations such as the first generation and the second generation.

（発明の効果）
以上述べたように、本発明によれば、ハブユニット軸受のパイロット外径部周面の塗装膜に電着塗装膜を用いることにより、膜厚が薄く、均一で、５Ｈ〜７Ｈの高い硬度を有する塗装膜を形成することができ、防錆効果の優れたハブユニット軸受を提供できる。 (The invention's effect)
As described above, according to the present invention, the electrodeposition coating film is used as the coating film on the outer surface of the pilot outer diameter portion of the hub unit bearing, so that the film thickness is thin, uniform, and high hardness of 5H to 7H. Thus, a hub unit bearing having an excellent rust prevention effect can be provided.

本発明の一実施形態に係るハブユニット軸受を示した縦断面図である。It is the longitudinal cross-sectional view which showed the hub unit bearing which concerns on one Embodiment of this invention.

符号の説明Explanation of symbols

１‥‥ハブユニット軸受
３‥‥外輪
５‥‥複列アンギュラ玉軸受
７‥‥第１軌道面
９‥‥第２軌道面
１３‥‥ハブ
１５‥‥第１内輪
１７‥‥軌道面
１９‥‥鋼球
２１‥‥保持器
２３‥‥第１ころ列
３１‥‥第２内輪
３３‥‥軌道面
３５‥‥第２ころ列
３７‥‥第２内輪保持筒
４２‥‥パイロット外径部
５１‥‥雌スプライン DESCRIPTION OF SYMBOLS 1 ... Hub unit bearing 3 Outer ring 5 Double row angular contact ball bearing 7 First raceway surface 9 Second raceway surface 13 Hub 15 First inner ring 17 Raceway surface 19 Steel balls 21 ... Cage 23 ... 1st roller row 31 ... 2nd inner ring 33 ... Raceway surface 35 ... 2nd roller row 37 ... 2nd inner ring holding cylinder 42 ... Pilot outer diameter part 51 ... Female spline

Claims (2)

駆動力や操舵力をホイールに伝達するハブユニット軸受において、
前記ハブユニット軸受のハブの前記ホイール側に凸状に形成されたパイロット外径部周面に、電着塗装法により塗装膜を形成したことを特徴とするハブユニット軸受。 In hub unit bearings that transmit driving force and steering force to wheels,
A hub unit bearing, wherein a coating film is formed by an electrodeposition coating method on a peripheral surface of a pilot outer diameter portion formed convexly on the wheel side of the hub of the hub unit bearing. 前記電着塗装法は、カチオン電着塗装法であることを特徴とする請求項１に記載のハブユニット軸受。   The hub unit bearing according to claim 1, wherein the electrodeposition coating method is a cationic electrodeposition coating method.
JP2007134379A 2007-05-21 2007-05-21 Hub unit bearing Pending JP2007223600A (en)

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JP2001334320A Division JP2003136902A (en) 2001-10-31 2001-10-31 Hub unit bearing

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JP2009254217A Division JP5093214B2 (en) 2009-11-05 2009-11-05 Electrodeposition coating method for hub unit bearings

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009093434A1 (en) * 2008-01-23 2009-07-30 Ntn Corporation Bearing device for wheel

Citations (6)

* Cited by examiner, † Cited by third party
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JPS63195297A (en) * 1987-02-06 1988-08-12 Toyota Motor Corp Electrodeposition method
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DE112009000176T5 (en) 2008-01-23 2011-01-27 Ntn Corp. Bearing device for a wheel

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