JP2016011705A - Bearing unit with encoder - Google Patents

Bearing unit with encoder Download PDF

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JP2016011705A
JP2016011705A JP2014133026A JP2014133026A JP2016011705A JP 2016011705 A JP2016011705 A JP 2016011705A JP 2014133026 A JP2014133026 A JP 2014133026A JP 2014133026 A JP2014133026 A JP 2014133026A JP 2016011705 A JP2016011705 A JP 2016011705A
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encoder
bearing unit
ring
protective cover
pair
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JP6287633B2 (en
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慶樹 原口
Yoshiki Haraguchi
慶樹 原口
雄三 川原田
Yuzo Kawarada
雄三 川原田
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NSK Ltd
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Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a bearing unit with an encoder, which prevents the encoder from being broken during transportation and which prevents erroneous assembly to a knuckle.SOLUTION: A bearing unit with an encoder includes a linked ring 20 which is pressed into inner peripheral surfaces of mutually opposed ends of a pair of inner rings 3a and 3b to prevent separation of the pair of inner rings 3a and 3b. A protective cover 21, which comprises a disk-shaped flat plate part 23, a cylindrical part 22 extended in an axial direction from each side surface of the flat plate part 23, and a knob part 24, is locked to the linked ring 20 in the state of covering a surface of the encoder 9.

Description

本発明は、自動車の車輪を懸架装置に対して回転自在に支持すると共に、この車輪の回転速度を検出する為の、エンコーダ付軸受ユニットに関するものである。   The present invention relates to a bearing unit with an encoder for rotatably supporting a vehicle wheel with respect to a suspension device and detecting the rotational speed of the wheel.

従来より、自動車の車輪の回転速度を検出する為のエンコーダを軸受ユニットに組み込んだ、エンコーダ付軸受ユニットにより、車輪を懸架装置に対して回転自在に支持すると共に、車輪の回転速度を検出する事が、広く行われている。例えば、大型自動車の車輪を懸架装置に対して回転自在に支持する為には、軸受ユニットの一種であり、大きな負荷容量を有する、複列円すいころ軸受ユニットを使用している。   Conventionally, an encoder for detecting the rotational speed of an automobile wheel is incorporated in the bearing unit. The bearing unit with the encoder supports the wheel rotatably with respect to the suspension device and detects the rotational speed of the wheel. However, it is widely done. For example, in order to rotatably support the wheel of a large automobile with respect to a suspension device, a double row tapered roller bearing unit having a large load capacity is used as a kind of bearing unit.

この様な目的で使用される軸受ユニットの従来構造の１例として、図６に示す様な構造が知られている。この従来構造のエンコーダ付軸受ユニット１は、懸架装置を構成し、車輪を固定する車軸（不図示）を、回転自在に支持している。   A structure as shown in FIG. 6 is known as an example of a conventional structure of a bearing unit used for such a purpose. This conventional bearing unit 1 with an encoder constitutes a suspension device and rotatably supports an axle (not shown) for fixing a wheel.

エンコーダ付軸受ユニット１は、互いに同心に配置された外輪２及び１対の内輪３ａ，３ｂと、転動体である複数個の円すいころ４とを備えている。外輪２は、全体を円筒状に形成され、内周面に複列の外輪軌道５を有する。各外輪軌道５は、それぞれが円すい面状で、外輪２の軸方向端部に向かう程内径が大きくなる方向に傾斜している。   The encoder-equipped bearing unit 1 includes an outer ring 2 and a pair of inner rings 3a and 3b arranged concentrically with each other, and a plurality of tapered rollers 4 which are rolling elements. The outer ring 2 is formed in a cylindrical shape as a whole, and has a double row outer ring raceway 5 on the inner peripheral surface. Each outer ring raceway 5 has a conical surface shape, and is inclined in a direction in which the inner diameter increases toward the axial end of the outer ring 2.

各内輪３ａ，３ｂは、全体を円筒状に形成され、それぞれの外周面に円すい面状の内輪軌道６を形成している。１対の内輪３ａ，３ｂは、その小鍔側端面同士を突き合わせた状態で組み立てられており、この内輪組立体の外周面には、それぞれが軸方向端部に向かう程外径が大きくなる方向に傾斜した、複列の内輪軌道６が存在する。各円すいころ４は、各外輪軌道５と各内輪軌道６との間に、それぞれ複数個ずつ、保持器７により転動自在に保持されている。   Each inner ring 3a, 3b is formed in a cylindrical shape as a whole, and a conical inner ring raceway 6 is formed on each outer peripheral surface. The pair of inner rings 3a and 3b are assembled in a state in which the end surfaces on the small collar side face each other, and the outer diameter of the inner ring assembly is such that the outer diameter increases toward the end in the axial direction. There are double-row inner ring raceways 6 that are inclined to each other. A plurality of each tapered roller 4 is rotatably held by a cage 7 between each outer ring raceway 5 and each inner ring raceway 6.

外輪２の両端部内周面と、各内輪３ａ，３ｂの大鍔側端部外周面との間には、シールリング８とエンコーダ９とをそれぞれ設けている。シールリング８は、断面Ｌ字状で全体を円環状に形成した芯金に、シールリップを有する弾性材を加硫接着したものであり、芯金を外輪２の端部内周面に内嵌固定し、シールリップを内輪３ａの大鍔側端部外周面の全周に摺接させている。
エンコーダ９は、断面Ｌ字状で全体を円環状に形成されたスリンガ１０と、円輪状のエンコーダ本体１１とにより構成されている。スリンガ１０は、その円筒部分を内輪３ｂの大鍔側端部外周面に外嵌固定すると共に、その円輪部分の外周部分を外輪２の端部内周面に近接対向させてラビリンスシールを形成している。シールリング８とスリンガ１０とにより、円すいころ４を設置した内部空間の両端部開口を塞ぎ、この内部空間内に封入したグリースが外部に漏洩する事を防止すると共に、外部に存在する異物が内部空間内に侵入する事を防止している。 A seal ring 8 and an encoder 9 are provided between the inner peripheral surface of both ends of the outer ring 2 and the outer peripheral surface of the large flange side end of each of the inner rings 3a and 3b. The seal ring 8 is formed by vulcanizing and bonding an elastic material having a seal lip to a cored bar having an L-shaped cross section and formed entirely in an annular shape, and the cored bar is fitted and fixed to the inner peripheral surface of the end portion of the outer ring 2. The seal lip is slidably brought into contact with the entire circumference of the outer peripheral surface of the large collar side end of the inner ring 3a.
The encoder 9 includes a slinger 10 having an L-shaped cross section and formed in an annular shape as a whole, and an annular encoder body 11. The slinger 10 externally fixes and fixes the cylindrical portion to the outer peripheral surface of the large collar side end of the inner ring 3b, and forms a labyrinth seal by causing the outer peripheral portion of the circular ring portion to face the inner peripheral surface of the end portion of the outer ring 2 in close proximity. ing. The seal ring 8 and the slinger 10 block the openings at both ends of the internal space where the tapered rollers 4 are installed, and prevent the grease enclosed in the internal space from leaking to the outside, Preventing entry into the space.

スリンガ１０の円輪部分の軸受外部側面には、エンコーダ本体１１が添着されている。エンコーダ本体１１は、フェライト粉末を混入したゴム磁石又はプラスチック磁石等の永久磁石により全体を円輪状に形成したもので、内輪３ｂと共に回転する。又、エンコーダ本体１１の被検出面である軸受外部側面には、Ｓ極とＮ極とが交互に且つ等間隔で配置されている。この様なエンコーダ本体１１の被検出面に、図示しないセンサの検出部を近接対向させる事により、車輪（車軸を支持する内輪３ｂ）の回転速度を検出可能としている。   An encoder body 11 is attached to the bearing outer side surface of the ring portion of the slinger 10. The encoder body 11 is formed as a whole by a permanent magnet such as a rubber magnet or a plastic magnet mixed with ferrite powder, and rotates together with the inner ring 3b. In addition, S poles and N poles are alternately arranged at equal intervals on the outer surface of the bearing, which is a detected surface of the encoder body 11. The detection speed of the wheel (the inner ring 3b that supports the axle) can be detected by making a detection unit of a sensor (not shown) close to and face the detection surface of the encoder body 11 as described above.

エンコーダ付軸受ユニット１を懸架装置に組み付ける前の状態に於いて、１対の内輪３ａ，３ｂの互いに対向する小鍔側端部の内周面に連結環２０を圧入する事で、１対の内輪３ａ，３ｂを互いに結合している。連結環２０は、樹脂製で全体を円環状に形成されており、１対の内輪３ａ，３ｂの突き合わせた部分に、径方向の締め代を有して内嵌固定されている。この為、エンコーダ付軸受ユニット１を懸架装置に組み付ける以前に、各内輪３ａ，３ｂ同士が不用意に分離する事を防止して、エンコーダ付軸受ユニット１を一体的に取り扱う事を容易にしている。   Before the bearing unit 1 with the encoder is assembled to the suspension device, the pair of inner rings 3a and 3b are press-fitted into the inner peripheral surface of the opposite edge of the small collar side to thereby form a pair Inner rings 3a and 3b are coupled to each other. The connecting ring 20 is made of resin and formed in an annular shape as a whole. The connecting ring 20 is fitted and fixed to a portion where the pair of inner rings 3a and 3b are in contact with each other with a radial interference. For this reason, before assembling the bearing unit 1 with the encoder to the suspension device, the inner rings 3a and 3b are prevented from being inadvertently separated from each other, making it easy to handle the bearing unit 1 with the encoder integrally. .

上述の様に構成するエンコーダ付軸受ユニット１を、自動車の懸架装置に組み付ける場合には、図７に示す様に、懸架装置を構成するナックル１６の内径部分に外輪２を内嵌した後、ナックル１６の内周面に形成した係合溝１８に係止リング１７を係合する。この様に、外輪２の両端部を、ナックル１６の内周面に形成した鍔と係止リング１７とにより軸方向に挟持する事により、ナックル１６に対して外輪２を軸方向に位置決め固定している。この状態で、エンコーダ９が装着された内輪３ｂの大鍔側端面に支持台１９を当接させて、内輪３ａの内径部に軸方向から車軸１５を圧入して、車軸１５の端部外周面に内輪３ａ，３ｂを外嵌固定する。この時、各内輪３ａ，３ｂの内周面に圧入されていた連結環２０は、車軸１５により支持台１９側に押し出されて回収される。この様に、連結環２０を取り外す工程が不要であり、回収された連結環２０は再利用可能である。   When the encoder-equipped bearing unit 1 configured as described above is assembled to a suspension device of an automobile, as shown in FIG. 7, after the outer ring 2 is fitted inside the inner diameter portion of the knuckle 16 constituting the suspension device, the knuckle The locking ring 17 is engaged with an engaging groove 18 formed on the inner peripheral surface of 16. In this manner, the outer ring 2 is positioned and fixed in the axial direction with respect to the knuckle 16 by clamping both ends of the outer ring 2 in the axial direction between the hooks formed on the inner peripheral surface of the knuckle 16 and the locking ring 17. ing. In this state, the support base 19 is brought into contact with the large flange side end surface of the inner ring 3b on which the encoder 9 is mounted, and the axle 15 is press-fitted into the inner diameter portion of the inner ring 3a from the axial direction. The inner rings 3a and 3b are fitted and fixed to the outer ring. At this time, the connecting ring 20 that has been press-fitted into the inner peripheral surfaces of the inner rings 3a and 3b is pushed out by the axle 15 toward the support base 19 and collected. Thus, the process of removing the connection ring 20 is not necessary, and the recovered connection ring 20 can be reused.

上述した様な構成のエンコーダ付軸受ユニット１の場合、軸受製造業者から自動車製造業者に軸受ユニットを輸送する際の荷姿は、軸を上下方向に向けた状態で、通い箱中に軸受ユニットを積み重ねる事が多い。元来、複列円すいころ軸受は、外輪２と各内輪３ａ，３ｂとが分離する構造である為、輸送中に分離すると、外輪２と各内輪３ａ，３ｂとの間にゴミが侵入したり、円すいころ４と各軌道面とがぶつかり合ってフォールスブリネリングが発生する可能性がある。又、複列円すいころ軸受の様な構成の軸受ユニットは、車重の嵩む大型の自動車に使用されることが多く、軸受サイズも比較的大型であると共に、同じ断面積の玉軸受と比較して重い（見掛けの比重が高い）。そこで、軸受ユニットの輸送時、樹脂製の連結環２０により各内輪３ａ，３ｂを非分離に固定する事が行われている。   In the case of the bearing unit 1 with an encoder having the above-described configuration, the packaging when the bearing unit is transported from the bearing manufacturer to the automobile manufacturer is such that the shaft is oriented vertically and the bearing unit is placed in the return box. Often stacked. Originally, the double-row tapered roller bearing has a structure in which the outer ring 2 and the inner rings 3a and 3b are separated from each other. Therefore, if they are separated during transportation, dust may enter between the outer ring 2 and the inner rings 3a and 3b. The tapered roller 4 and each raceway surface collide with each other, and there is a possibility that false bulleting will occur. In addition, a bearing unit having a configuration such as a double row tapered roller bearing is often used in a large automobile with a heavy vehicle weight, and the bearing size is relatively large, and compared with a ball bearing having the same cross-sectional area. Heavy (apparent specific gravity is high). Thus, when the bearing unit is transported, the inner rings 3a and 3b are fixed in a non-separable manner by the resin-made connecting ring 20.

一方、磁性体をゴム又は樹脂のバインダ中に拡散して成形されるエンコーダ９を装着したエンコーダ付軸受ユニット１の場合には、輸送中の振動により上下に積み重ねられた軸受ユニットの軸芯がずれ、一方の軸受ユニットの端部が、他方の軸受ユニットのエンコーダ本体１１に接触し、エンコーダ本体１１の被検出面を傷付けてしまう事があった。エンコーダ本体１１が損傷を受けると、センサの出力信号を劣化させ、回転速度検出の信頼性を低下させる虞がある。   On the other hand, in the case of an encoder bearing unit 1 equipped with an encoder 9 formed by diffusing a magnetic material into a rubber or resin binder, the shaft center of the bearing unit stacked up and down due to vibration during transportation is displaced. The end portion of one bearing unit may come into contact with the encoder body 11 of the other bearing unit, and the detected surface of the encoder body 11 may be damaged. If the encoder main body 11 is damaged, there is a possibility that the output signal of the sensor is deteriorated and the reliability of rotation speed detection is lowered.

特許文献１には、磁気エンコーダの表面を保護カバーで保護した状態で軸受ユニットに装着した後、保護カバーを取り去る、磁気エンコーダ付軸受ユニットが記載されている。しかし、この方法は簡便であるが、保護カバーを取り去らなくとも軸受ユニットの組み込みが可能であるので、保護カバーを外し忘れる可能性がある。磁気エンコーダの表面を保護カバーが覆った状態では、保護カバーがセンサに接触して、センサが傷付き破損してしまう虞がある。   Patent Document 1 describes a bearing unit with a magnetic encoder in which the surface of a magnetic encoder is attached to a bearing unit in a state where the surface is protected by a protective cover, and then the protective cover is removed. However, although this method is simple, since the bearing unit can be incorporated without removing the protective cover, there is a possibility of forgetting to remove the protective cover. When the surface of the magnetic encoder is covered with the protective cover, the protective cover may come into contact with the sensor, and the sensor may be damaged or damaged.

特開２００４−２１２３５１号公報JP 2004-212351 A 特開２００１−０９９１７５号公報JP 2001-099175 A

本発明は、上述の様な事情に鑑みて、輸送時に於けるエンコーダの破損を防止すると共に、ナックルへの組み付け誤りを防止したエンコーダ付軸受ユニットを、安価に実現すべく発明したものである。   In view of the circumstances as described above, the present invention has been invented to realize an inexpensive bearing unit with an encoder that prevents damage to the encoder during transportation and prevents an error in assembly to the knuckle.

本発明のエンコーダ付軸受ユニットは、内周面に複列の外輪軌道を有する外輪と、それぞれの外周面に内輪軌道を有する１対の内輪と、前記両外輪軌道と前記両内輪軌道との間に、両列毎に複数個ずつ転動自在に設けられた転動体と、前記内輪の端部に支持されたエンコーダと、を備えている。   The bearing unit with an encoder according to the present invention includes an outer ring having a double row outer ring raceway on an inner peripheral surface, a pair of inner rings having inner ring raceways on each outer peripheral surface, the outer ring raceway and the inner ring raceways. In addition, a plurality of rolling elements are provided so as to be capable of rolling plurally for each row, and an encoder supported at the end of the inner ring.

特に、本発明のエンコーダ付軸受ユニットは、前記１対の内輪の互いに対向する端部の内周面に圧入されて、前記１対の内輪の分離を防止する連結環を備え、前記連結環に係止されて、前記エンコーダを覆う保護カバーを備えている。
更に、前記保護カバーは、前記エンコーダを覆う円板状の平板部と、前記平板部の側面の中央部に設けられ、前記連結環と係合する円筒部と、前記平板部の前記円筒部とは反対側の側面の中央部に設けられ、径方向断面が長方形である取っ手部と、を備えており、前記円筒部は少なくとも１対の切欠きを有しており、前記取っ手部の長辺部は、前記保護カバーの中心軸に対して前記切欠きと同位相の位置に設けられている。 In particular, the bearing unit with an encoder of the present invention includes a connecting ring that is press-fitted into inner peripheral surfaces of opposite ends of the pair of inner rings to prevent the pair of inner rings from being separated. A protective cover that is locked and covers the encoder is provided.
Further, the protective cover is a disc-shaped flat plate portion that covers the encoder, a cylindrical portion that is provided at a central portion of a side surface of the flat plate portion, and that engages with the connecting ring, and the cylindrical portion of the flat plate portion, Is provided at the center of the opposite side surface and has a handle having a rectangular radial cross section, and the cylindrical portion has at least one pair of notches, and the long side of the handle The portion is provided at a position in phase with the notch with respect to the central axis of the protective cover.

本発明のエンコーダ付軸受ユニットは、輸送時に於けるエンコーダの破損を防止すると共に、ナックルへの組み付け誤りを防止しながら、安価に実現する事ができる。
即ち、保護カバーがエンコーダの表面を覆った状態で輸送されるので、隣接する軸受ユニットによりエンコーダ本体が損傷を受ける事は無い。軸受ユニットをナックルに組み付ける際、連結環及び保護カバーを外さずに組み付ける事が出来ないので、保護カバーの外し忘れと、その結果発生するセンサ破損の虞が無い。又、エンコーダが装着された内輪に保護カバーが係止されているので、エンコーダ装着側が明確になり、ナックル組み込み時の誤組み付けが防止される
連結環は、エンコーダの有無に関わらず同じ内径を有する軸受ユニット間で共通して使用可能であり、大量生産できて生産コストの低減になると共に、管理コストも低減できる。そして、保護カバーは連結環に係止されるので、保護カバーのみを製造すればよく、コストアップを抑制している。 The bearing unit with an encoder of the present invention can be realized at a low cost while preventing the encoder from being damaged during transportation and preventing an assembly error to the knuckle.
That is, since the protective cover covers the surface of the encoder, the encoder body is not damaged by the adjacent bearing unit. When the bearing unit is assembled to the knuckle, it cannot be assembled without removing the connecting ring and the protective cover, so there is no risk of forgetting to remove the protective cover and the resulting sensor damage. Also, since the protective cover is locked to the inner ring where the encoder is mounted, the encoder mounting side becomes clear, and incorrect assembly is prevented when the knuckle is assembled. The connecting ring has the same inner diameter regardless of the presence or absence of the encoder It can be used in common between the bearing units and can be mass-produced to reduce production costs and management costs. And since a protective cover is latched by a connection ring, it is only necessary to manufacture a protective cover, and the cost increase is suppressed.

第１実施形態を示す、エンコーダ付軸受ユニットの断面図。Sectional drawing of the bearing unit with an encoder which shows 1st Embodiment. 第１実施形態を示す、保護カバーの正面図。The front view of the protective cover which shows 1st Embodiment. エンコーダ付軸受ユニットをナックルに圧入する説明図。Explanatory drawing which press-fits the bearing unit with an encoder to a knuckle. エンコーダ付軸受ユニットをナックルに圧入する変形例の説明図。Explanatory drawing of the modification which press-fits a bearing unit with an encoder to a knuckle. 第２実施形態を示す、エンコーダ付軸受ユニットの断面図。Sectional drawing of the bearing unit with an encoder which shows 2nd Embodiment. 従来構造の１例を示す、エンコーダ付軸受ユニットの断面図。Sectional drawing of the bearing unit with an encoder which shows an example of the conventional structure. エンコーダ付軸受ユニットに車軸を圧入する説明図。Explanatory drawing which press-fits an axle shaft to a bearing unit with an encoder.

［第１実施形態］
図１，２は、本発明の第１実施形態を示している。尚、本発明の特徴は、エンコーダ付軸受ユニットを、１対の内輪同士が不用意に分離するのを防止しつつ、エンコーダの破損を防止する構造を工夫した点にある。その他の部分の構成及び作用は、図６に示した従来構造の場合と同様である為、同等部分には同一符号を付して、重複する説明を省略若しくは簡略にし、以下、本発明の特徴部分を中心に説明する。 [First Embodiment]
1 and 2 show a first embodiment of the present invention. The feature of the present invention resides in that the bearing unit with encoder is devised to prevent the encoder from being damaged while preventing the pair of inner rings from being inadvertently separated from each other. Since the configuration and operation of the other parts are the same as those in the case of the conventional structure shown in FIG. 6, the same parts are denoted by the same reference numerals, and redundant description is omitted or simplified. The explanation will focus on the part.

本実施形態のエンコーダ付軸受ユニットは、内周面に複列の外輪軌道５を有する外輪２と、それぞれの外周面に内輪軌道６を有する１対の内輪３ａ，３ｂと、両外輪軌道５と両内輪軌道６との間に、両列毎に複数個ずつ転動自在に設けられた転動体である円すいころ４と、を備えた複列円すいころ軸受タイプの軸受ユニットである。そして、内輪３ａの大鍔側端部外周面と外輪２の端部内周面との間にシールリング８を設け、内輪３ｂの大鍔側端部外周面にエンコーダ９を装着している。   The bearing unit with an encoder according to the present embodiment includes an outer ring 2 having a double row outer ring raceway 5 on an inner peripheral surface, a pair of inner rings 3a and 3b having inner ring raceways 6 on each outer peripheral surface, and both outer ring raceways 5 This is a double-row tapered roller bearing type bearing unit that includes a tapered roller 4 that is a rolling element provided between the inner ring raceways 6 so as to be capable of rolling plurally in both rows. A seal ring 8 is provided between the outer peripheral surface of the end portion of the inner ring 3a and the inner peripheral surface of the end portion of the outer ring 2, and an encoder 9 is mounted on the outer peripheral surface of the end portion of the inner ring 3b.

エンコーダ付軸受ユニットを構成する１対の内輪３ａ，３ｂは、連結環２０により互いに結合される事により、輸送時にも非分離状態に維持されている。連結環２０は、ポリエチレン等の樹脂材を円環状に形成したもので、１対の内輪３ａ，３ｂの互いに対向する小鍔側端部の内周面に圧入されている。
尚、内輪３ｂの大鍔側外周面に装着されたエンコーダ９は、外輪２とは非接触であり、また、外輪２の端部内周面に固定されたシールリング８は、内輪３ａの大鍔側外周面に摺接するものの、シールリップの緊迫力による摩擦力は大きくはない。この為、エンコーダ９とシールリップ８とでは、外輪２と１対の内輪３ａ，３ｂとを非分離状態に保つことは困難であり、連結環２０を必要としている。 The pair of inner rings 3a and 3b constituting the encoder-equipped bearing unit are connected to each other by the connecting ring 20, so that they are maintained in a non-separated state during transportation. The connecting ring 20 is formed of a resin material such as polyethylene in an annular shape, and is press-fitted into the inner peripheral surface of the pair of inner rings 3a and 3b that face each other on the small edge side.
The encoder 9 mounted on the outer peripheral surface of the inner ring 3b is not in contact with the outer ring 2, and the seal ring 8 fixed to the inner peripheral surface of the end of the outer ring 2 is connected to the inner ring 3a. Although it is in sliding contact with the outer peripheral surface, the frictional force due to the tightening force of the seal lip is not large. For this reason, it is difficult for the encoder 9 and the seal lip 8 to keep the outer ring 2 and the pair of inner rings 3a and 3b in a non-separated state, and the connecting ring 20 is required.

輸送時に、積み重ねられた軸受ユニットによりエンコーダ９が損傷する事を防止する為に、エンコーダ９の表面を覆う保護カバー２１を、連結管２０の内径側に係止している。保護カバー２１は、ポリエチレン等の樹脂製であり、エンコーダ９を覆う円板状の平板部２３と、平板部２３の側面の中央部に設けられ、連結環２０と係合する円筒部２２と、平板部２３の円筒部２２とは反対側の側面の中央部に設けられ、径方向断面が長方形である取っ手部２４とを備えている。   In order to prevent the encoder 9 from being damaged by the stacked bearing units during transportation, a protective cover 21 covering the surface of the encoder 9 is locked to the inner diameter side of the connecting pipe 20. The protective cover 21 is made of a resin such as polyethylene, and includes a disk-shaped flat plate portion 23 that covers the encoder 9, a cylindrical portion 22 that is provided at the center of the side surface of the flat plate portion 23, and engages with the connecting ring 20; The flat plate portion 23 includes a handle portion 24 that is provided at the center of the side surface opposite to the cylindrical portion 22 and has a rectangular radial cross section.

円筒部２２は、平板部２３（保護カバー２１）と同心の状態で、平板部２３の側面の中央部から軸方向に延出して略円筒状に形成されており、突起２５と、１対の切欠き２６とを備えている。突起２５は、円筒部２２の先端部に径方向外方に突出して設けられており、挿入時の案内の為の面取を円筒部２２の先端側に、抜け止めの為の鉤部を反先端側に、それぞれ形成している。そして、円筒部２２の外周面を連結管２０の内径に嵌合させて径方向の位置決めを図ると共に、突起２５（の駒部）を連結環２０の端面と係合させて保護カバー２１の脱落を防止している。１対の切欠き２６は、保護カバー２１の中心軸を挟んだ位置（位相が１８０度ずれた位置）に、円筒部２２の先端から軸方向に沿って設けられており、円筒部２２の剛性を下げて連結環２０との着脱を容易にしている。   The cylindrical portion 22 is concentric with the flat plate portion 23 (protective cover 21) and extends in the axial direction from the central portion of the side surface of the flat plate portion 23, and is formed in a substantially cylindrical shape. And a notch 26. The protrusion 25 protrudes radially outward from the distal end portion of the cylindrical portion 22, and a chamfer for guiding at the time of insertion is provided on the distal end side of the cylindrical portion 22, and a hook portion for retaining the projection is opposed. Each is formed on the tip side. Then, the outer peripheral surface of the cylindrical portion 22 is fitted to the inner diameter of the connecting tube 20 for positioning in the radial direction, and the protrusion 25 (the frame portion) is engaged with the end surface of the connecting ring 20 to drop off the protective cover 21. Is preventing. The pair of notches 26 are provided along the axial direction from the tip of the cylindrical portion 22 at a position (phase shifted by 180 degrees) with the central axis of the protective cover 21 interposed therebetween. Is lowered to facilitate attachment / detachment with the connecting ring 20.

平板部２３は、エンコーダ９とほぼ同じ外径寸法を有する円板であり、保護カバー２１を位置決めする厚肉部２７と、エンコーダ９を保護する薄肉部２８と、成形精度を維持する為の肉盗み部２９とを備えている。厚肉部２７は、平板部２３の径方向中間部分に設けられており、エンコーダ９が装着された内輪３ｂの大鍔側端面に突き合わせて、保護カバー２１を軸方向に位置決めしている。薄肉部２８は、厚肉部２７から径方向外方に延出して形成されており、段部を介して軸方向に後退して、エンコーダ９とは隙間を空けて対向する事で、エンコーダ９の表面を保護している。肉盗み部２９は、円筒部２２と平板部２３との連結部分で、円筒部２２とは反対側の側面に円輪状に設けられており、保護カバー２１の肉厚をなるべく一定に保つ事でひけを防止し、保護カバー２１の成形精度を維持している。   The flat plate portion 23 is a disc having substantially the same outer diameter as the encoder 9, a thick portion 27 for positioning the protective cover 21, a thin portion 28 for protecting the encoder 9, and a meat for maintaining molding accuracy. And a stealing unit 29. The thick portion 27 is provided at a radial intermediate portion of the flat plate portion 23, and abuts against the end surface of the inner ring 3b to which the encoder 9 is attached to position the protective cover 21 in the axial direction. The thin-walled portion 28 is formed to extend radially outward from the thick-walled portion 27, retreats in the axial direction via the stepped portion, and faces the encoder 9 with a gap therebetween, whereby the encoder 9 Protect the surface. The meat stealing portion 29 is a connecting portion between the cylindrical portion 22 and the flat plate portion 23 and is provided in an annular shape on the side surface opposite to the cylindrical portion 22. By keeping the thickness of the protective cover 21 as constant as possible. Sinking is prevented and the forming accuracy of the protective cover 21 is maintained.

取っ手部２４は、平板部２３（保護カバー２１）と同心の状態で、平板部２３の側面の中央部から軸方向に延出して形成されており、径方向断面（中心軸と直交する平面における断面）を中空の長方形としている。また、取っ手部２４の長辺部は、保護カバー２１の中心軸に対して、円筒部２２に設けた１対の切欠き２６と同位相の位置に形成されている。この取っ手部２４は保護カバー２１を着脱する際に掴む部分であり、取っ手部２４の長辺を挟んで摘む事で、連結環２０に内嵌している円筒部２２の縮径方向への変形を容易として、保護カバー２１を連結環２０から取り外し易くしている。
尚、保護カバー２１を装着したエンコーダ付軸受ユニットを軸方向に積み重ねた時、取っ手部２４は、隣接する軸受ユニットに装着された保護カバー２１の円筒部２２の内径内に収納される形状になっている。これによって、軸受ユニットの積み重ねを可能とすると共に、積み重ねた軸受ユニットの中心軸が互いに大きくずれ、輸送中に荷崩れする事を防止している。 The handle portion 24 is concentric with the flat plate portion 23 (protective cover 21) and is formed to extend in the axial direction from the central portion of the side surface of the flat plate portion 23, and is formed in a radial cross section (on a plane orthogonal to the central axis). The cross section is a hollow rectangle. The long side portion of the handle portion 24 is formed at the same phase as the pair of notches 26 provided in the cylindrical portion 22 with respect to the central axis of the protective cover 21. The handle portion 24 is a portion that is gripped when the protective cover 21 is attached and detached, and the cylindrical portion 22 that is internally fitted in the connecting ring 20 is deformed in the reduced diameter direction by pinching it with the long side of the handle portion 24 interposed therebetween. The protective cover 21 is easily removed from the connecting ring 20.
When the bearing units with an encoder with the protective cover 21 attached are stacked in the axial direction, the handle 24 is shaped to be accommodated within the inner diameter of the cylindrical portion 22 of the protective cover 21 attached to the adjacent bearing unit. ing. As a result, the bearing units can be stacked, and the center axes of the stacked bearing units are largely displaced from each other, preventing the load from collapsing during transportation.

次に、エンコーダ付軸受ユニットを、懸架装置を構成するナックル１６に組み付ける工程を説明する。図３に示す様に、連結環２０と保護カバー２１とを装着した状態のエンコーダ付軸受ユニットは、エンコーダ９が車両の幅方向中央側（図３の右側）となる状態で、外輪２の端面を圧入治具４０で軸方向に押圧する事により、ナックル１６へ圧入される。円板部２３の外径寸法はエンコーダ９の外径寸法とほぼ同じ（外輪２の端部内径寸法よりも小さい）ので、圧入治具４０は、保護カバー２１と干渉する事無く外輪２の端面に突き合わせ可能である。圧入完了後、車軸１５を圧入する際の支承面を得る為（図７参照）、保護カバー２１は連結環２０を内輪３ａ，３ｂの内径に残した状態で取り外される。この段階では、１対の内輪３ａ，３ｂを同軸に保つ為、連結環２０を残して保護カバーのみを外している。その後、前述した図７と同様の工程により、内輪３ｂの端面を支承し、連結環２０を押し出しつつ、車軸１５を圧入する。   Next, a process of assembling the encoder-equipped bearing unit to the knuckle 16 constituting the suspension device will be described. As shown in FIG. 3, the bearing unit with an encoder in a state in which the connecting ring 20 and the protective cover 21 are attached has the end face of the outer ring 2 in a state where the encoder 9 is at the center in the width direction of the vehicle (right side in FIG. 3). Is pressed into the knuckle 16 by pressing it in the axial direction with the press-fitting jig 40. Since the outer diameter dimension of the disc portion 23 is substantially the same as the outer diameter dimension of the encoder 9 (smaller than the inner diameter dimension of the end portion of the outer ring 2), the press-fitting jig 40 does not interfere with the protective cover 21 and the end surface of the outer ring 2. Can be matched. After the press-fitting is completed, in order to obtain a bearing surface for press-fitting the axle 15 (see FIG. 7), the protective cover 21 is removed with the connecting ring 20 left on the inner diameters of the inner rings 3a and 3b. At this stage, in order to keep the pair of inner rings 3a and 3b coaxial, only the protective cover is removed leaving the connecting ring 20. After that, the axle 15 is press-fitted while supporting the end face of the inner ring 3b and pushing out the connecting ring 20 by the same process as in FIG.

ナックル１６と外輪２は、車両走行時の横荷重による軸方向変位に伴う異音（バッキン音）を防止する為、大きな締め代で嵌合される為、圧入時に金属粉やバリが発生する可能性がある。本実施形態の保護カバー２１は、圧入時においても軸受ユニットに装着されているので、圧入時に発生する金属粉等の塵埃に対しても、エンコーダ９への付着を防止する効果がある。
又、保護カバー２１は連結環２０とは別体に設けられているので、残された連結環２０により１対の内輪３ａ，３ｂを、非分離且つ同軸の状態に保つ事ができる。尚、円すいころ軸受の内輪の小鍔側は肉薄で逃げも存在する為、小鍔側端面に大きな面取を設ける事ができない。従って、１対の内輪３ａ，３ｂに芯ずれが発生すると、車軸１５の圧入に大きな障害となる。
更に、本実施形態の場合、取っ手部２４の形状や、切欠き２６との位相を工夫して、連結環２０を残したままで、保護カバー２１の取り外しを容易にしている。 The knuckle 16 and the outer ring 2 are fitted with a large tightening allowance to prevent abnormal noise (backing noise) due to axial displacement due to lateral load during vehicle travel, so that metal powder and burrs can be generated during press-fitting There is sex. Since the protective cover 21 of the present embodiment is mounted on the bearing unit even during press-fitting, there is an effect of preventing adhesion of the encoder 9 to dust such as metal powder generated during press-fitting.
Further, since the protective cover 21 is provided separately from the connecting ring 20, the pair of inner rings 3 a and 3 b can be kept non-separated and coaxial with the remaining connecting ring 20. In addition, since the small flange side of the inner ring of the tapered roller bearing is thin and has a clearance, it is impossible to provide a large chamfer on the end surface of the small roller side. Therefore, if a misalignment occurs in the pair of inner rings 3a and 3b, it becomes a great obstacle to press-fitting the axle 15.
Furthermore, in the case of this embodiment, the shape of the handle part 24 and the phase with the notch 26 are devised to facilitate the removal of the protective cover 21 while leaving the connecting ring 20.

図４は、エンコーダ付軸受ユニットをナックル１６に圧入する工程の変形例を示している。本変形例の場合、圧入治具４０ａの先端部内径側に係合爪４１を設けており、保護カバー２１の平板部２３の外周縁（薄肉部２８とエンコーダ９との隙間の空間）に係合爪４１を係止し、保護カバー２１を引き抜いている。そして、圧入治具４０ａの内部に残った保護カバー２１を、エジェクターピン４２で押して排出する。これにより、保護カバー２１と連結環２０を自動で分離する事が出来る。本変形例の場合は、保護カバー２１の切欠き２６を１対ではなく、複数設けることで、保護カバー２１の連結環２０への係止力を下げておくとよい。   FIG. 4 shows a modification of the step of press-fitting the encoder-equipped bearing unit into the knuckle 16. In the case of this modification, an engagement claw 41 is provided on the inner diameter side of the tip end portion of the press-fitting jig 40a, and the engagement claw 41 is engaged with the outer peripheral edge (the space between the thin portion 28 and the encoder 9) of the flat plate portion 23 of the protective cover 21. The claw 41 is locked and the protective cover 21 is pulled out. Then, the protective cover 21 remaining inside the press-fitting jig 40a is pushed by the ejector pin 42 and discharged. Thereby, the protective cover 21 and the connection ring 20 can be automatically separated. In the case of this modification, it is preferable to reduce the locking force of the protective cover 21 to the connecting ring 20 by providing a plurality of notches 26 in the protective cover 21 instead of a pair.

以上の構成により、本発明のエンコーダ付軸受ユニットは、輸送時に於けるエンコーダの破損を防止すると共に、ナックルへの組み付け誤りを防止しながら、安価に製造する事ができる。
即ち、連結環２０及び保護カバー２１を取り外さなければ車軸１５を軸受ユニットに組み込む事ができない（保護カバー２１が取り付けられた状態では車軸１５の圧入ができない）ので、保護カバー２１を外し忘れる虞が無く、その結果、センサの障害が発生する事も無い。又、保護カバー２１は連結２０と別体である為、連結環２０を残して保護カバー２１だけを外す事により、１対の内輪３ａ，３ｂの同軸を保ったまま、車軸１５の圧入時における圧入荷重の支承面（内輪３ｂの端面）を得られる。
連結環２０は、内径寸法が同じであれば異なる軸受ユニットでも共通して使用可能であり、大量生産によりコスト低減する事が可能であるが、本例の場合、保護カバー２１だけを追加で製造すればよいので、コストアップを抑制できる。
又、シールリング８を構成するシールリップに使用される弾性材は、シールリップの強度を高める為にカーボンブラックが配合されて、黒色をしている。従って、芯金全体が黒色の弾性材で被覆される形態のシールリングの場合、フェライトなどの磁性体の含有により黒色であるエンコーダ９との見分けがつきにくい。本発明のエンコーダ付軸受ユニットは、保護カバー２１によりエンコーダ９が装着された側が明確になるので、ナックル１６に組み込み時の誤組み付けが防止できる。 With the above configuration, the bearing unit with an encoder of the present invention can be manufactured at a low cost while preventing the encoder from being damaged during transportation and preventing an assembly error to the knuckle.
In other words, the axle 15 cannot be incorporated into the bearing unit unless the connecting ring 20 and the protective cover 21 are removed (the axle 15 cannot be press-fitted when the protective cover 21 is attached), so there is a risk that the protective cover 21 may be forgotten to be removed. As a result, a sensor failure does not occur. Further, since the protective cover 21 is separate from the connection 20, by removing only the protective cover 21 while leaving the connection ring 20, the pair of inner rings 3a and 3b is kept coaxial while the axle 15 is press-fitted. A bearing surface (end surface of the inner ring 3b) for the press-fitting load can be obtained.
The connecting ring 20 can be used in common with different bearing units as long as the inner diameter is the same, and the cost can be reduced by mass production. In this example, only the protective cover 21 is additionally manufactured. Therefore, the cost increase can be suppressed.
In addition, the elastic material used for the seal lip constituting the seal ring 8 is black by adding carbon black to increase the strength of the seal lip. Therefore, in the case of a seal ring in which the entire core is covered with a black elastic material, it is difficult to distinguish it from the black encoder 9 due to the inclusion of a magnetic material such as ferrite. In the bearing unit with an encoder according to the present invention, the side on which the encoder 9 is mounted is clarified by the protective cover 21, so that it is possible to prevent erroneous assembly when being assembled into the knuckle 16.

［第２実施形態］
図５は、本発明の第２実施形態を示している。本実施形態のエンコーダ付軸受ユニットの場合、円筒部２２ａの外周面の全周に段部４３が設けられており、この段部４３と突起部２５との間に連結環２０を軸方向に挟み込み、連結環２０の軸方向の位置決めを図っている。尚、段部４３の代わりに、径方向外方突出するに環状突起を設ける事もできる。 [Second Embodiment]
FIG. 5 shows a second embodiment of the present invention. In the case of the bearing unit with an encoder of the present embodiment, a stepped portion 43 is provided on the entire outer periphery of the cylindrical portion 22a, and the connecting ring 20 is sandwiched between the stepped portion 43 and the protruding portion 25 in the axial direction. The positioning of the connecting ring 20 in the axial direction is intended. Instead of the stepped portion 43, an annular protrusion can be provided to project outward in the radial direction.

保護カバー２１ａをエンコーダ付軸受ユニットに取り付ける際には、連結環２０を中央部から若干エンコーダ９の側に寄った位置に嵌合させ、この状態で、保護カバー２１ａを挿入する。挿入時、円筒部２２ａの段部４３が連結環２０の端面に突き当たり、連結環２０を押して軸方向に移動させる。そして、平板部２３が内輪３ｂの大鍔側端面に着座した時、連結環２０は正規の軸方向位置に位置決めされる。これにより、連結環２０を１対の内輪３ａ，３ｂの中央に掛け渡しているので、連結環２０の位置決め不良により、係り代が少なくなった側の内輪が、輸送中や懸架装置への組み込み作業中に脱落する事を防止している。その他の構成及び作用効果は、前述した第１実施形態と同様である。   When attaching the protective cover 21a to the encoder-equipped bearing unit, the connecting ring 20 is fitted to a position slightly closer to the encoder 9 side from the center, and the protective cover 21a is inserted in this state. At the time of insertion, the stepped portion 43 of the cylindrical portion 22a hits the end surface of the connecting ring 20 and pushes the connecting ring 20 to move in the axial direction. When the flat plate portion 23 is seated on the end face of the inner ring 3b, the connecting ring 20 is positioned at the normal axial position. As a result, the connecting ring 20 is stretched over the center of the pair of inner rings 3a and 3b, so that the inner ring on the side where the engagement cost has been reduced due to poor positioning of the connecting ring 20 is incorporated into the suspension system during transportation. Prevents falling off during work. Other configurations and operational effects are the same as those of the first embodiment described above.

本発明のエンコーダ付軸受ユニットは、自動車の車輪を懸架装置に対して回転自在に支持する軸受ユニットとして使用可能である。   The bearing unit with an encoder of the present invention can be used as a bearing unit that rotatably supports a vehicle wheel with respect to a suspension device.

１ エンコーダ付軸受ユニット
２ 外輪
３ａ，３ｂ 内輪
４ 円すいころ
５ 外輪軌道
６ 内輪軌道
７ 保持器
８ シールリング
９ エンコーダ
１０ スリンガ
１１ エンコーダ本体
１５ 車軸
１６ ナックル
１７ 係止リング
１８ 係合溝
１９ 支持台
２０ 連結環
２１，２１ａ 保護カバー
２２，２２ａ 円筒部
２３ 平板部
２４ 取っ手部
２５ 突起
２６ 切欠き
２７ 厚肉部
２８ 薄肉部
２９ 肉盗み部
４０，４０ａ 圧入治具
４１ 係合爪
４２ エジェクターピン
４３ 段部 DESCRIPTION OF SYMBOLS 1 Bearing unit with encoder 2 Outer ring 3a, 3b Inner ring 4 Tapered roller 5 Outer ring raceway 6 Inner ring raceway 7 Cage 8 Seal ring 9 Encoder 10 Slinger 11 Encoder main body 15 Axle 16 Knuckle 17 Lock ring 18 Engagement groove 19 Support base 20 Connection Rings 21, 21a Protective cover 22, 22a Cylindrical portion 23 Flat plate portion 24 Handle portion 25 Projection 26 Notch 27 Thick portion 28 Thin portion 29 Meat stealing portion 40, 40a Press fitting jig 41 Engaging claw 42 Ejector pin 43 Step portion

Claims (2)

内周面に複列の外輪軌道を有する外輪と、それぞれの外周面に内輪軌道を有する１対の内輪と、前記両外輪軌道と前記両内輪軌道との間に、両列毎に複数個ずつ転動自在に設けられた転動体と、前記内輪の端部に支持されたエンコーダと、を備えたエンコーダ付軸受ユニットであって、
前記１対の内輪の互いに対向する端部の内周面に圧入されて、前記１対の内輪の分離を防止する連結環を備え、前記連結環に係止されて、前記エンコーダを覆う保護カバーを備えた事を特徴とするエンコーダ付軸受ユニット。 A plurality of outer rings having double-row outer ring raceways on the inner peripheral surface, a pair of inner rings having inner ring raceways on each outer peripheral surface, and both outer ring raceways and both inner ring raceways for each row. A bearing unit with an encoder, comprising: a rolling element that is freely rollable; and an encoder that is supported at an end of the inner ring,
A protective cover that includes a connecting ring that is press-fitted into inner peripheral surfaces of opposite ends of the pair of inner rings and prevents the pair of inner rings from being separated, and is locked to the connecting ring to cover the encoder A bearing unit with an encoder characterized by comprising 前記保護カバーは、前記エンコーダを覆う円板状の平板部と、前記平板部の側面の中央部に設けられ、前記連結環と係合する円筒部と、前記平板部の前記円筒部とは反対側の側面の中央部に設けられ、径方向断面が長方形である取っ手部と、を備えており、前記円筒部は少なくとも１対の切欠きを有しており、前記取っ手部の長辺部は、前記保護カバーの中心軸に対して前記切欠きと同位相の位置に設けられている事を特徴とする請求項１に記載したエンコーダ付軸受ユニット。   The protective cover is provided on a disk-shaped flat plate portion that covers the encoder, a cylindrical portion that is provided at a central portion of a side surface of the flat plate portion, and engages with the connecting ring, and is opposite to the cylindrical portion of the flat plate portion. A handle portion having a rectangular radial cross section, and the cylindrical portion has at least one pair of notches, and the long side portion of the handle portion is The bearing unit with an encoder according to claim 1, wherein the bearing unit is provided at a position in phase with the notch with respect to a central axis of the protective cover.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4719415Y1 (en) * 1968-11-01 1972-07-03
JPS63152713A (en) * 1986-12-15 1988-06-25 Koyo Seiko Co Ltd Double row ball bearing and manufacture thereof
JP2004176827A (en) * 2002-11-27 2004-06-24 Ntn Corp Protective cap of bearing device for wheel
JP2006132611A (en) * 2004-11-04 2006-05-25 Ntn Corp Bearing unit assembly with rotation sensor and method of incorporating bearing unit with rotation sensor
JP2007333177A (en) * 2006-06-19 2007-12-27 Nsk Ltd Bearing holder
JP2008284614A (en) * 2007-05-15 2008-11-27 Jtekt Corp Bearing device and jig for preventing erroneous assembly of bearing
JP2013142219A (en) * 2012-01-06 2013-07-22 M Tec:Kk Noise insulation concrete plate
JP2013142419A (en) * 2012-01-10 2013-07-22 Jtekt Corp Protective cover and vehicular rolling bearing device mounted with the same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4719415Y1 (en) * 1968-11-01 1972-07-03
JPS63152713A (en) * 1986-12-15 1988-06-25 Koyo Seiko Co Ltd Double row ball bearing and manufacture thereof
JP2004176827A (en) * 2002-11-27 2004-06-24 Ntn Corp Protective cap of bearing device for wheel
JP2006132611A (en) * 2004-11-04 2006-05-25 Ntn Corp Bearing unit assembly with rotation sensor and method of incorporating bearing unit with rotation sensor
JP2007333177A (en) * 2006-06-19 2007-12-27 Nsk Ltd Bearing holder
JP2008284614A (en) * 2007-05-15 2008-11-27 Jtekt Corp Bearing device and jig for preventing erroneous assembly of bearing
JP2013142219A (en) * 2012-01-06 2013-07-22 M Tec:Kk Noise insulation concrete plate
JP2013142419A (en) * 2012-01-10 2013-07-22 Jtekt Corp Protective cover and vehicular rolling bearing device mounted with the same

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