JP2016050667A - Rolling bearing unit with encoder - Google Patents

Rolling bearing unit with encoder Download PDF

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Publication number
JP2016050667A
JP2016050667A JP2014178172A JP2014178172A JP2016050667A JP 2016050667 A JP2016050667 A JP 2016050667A JP 2014178172 A JP2014178172 A JP 2014178172A JP 2014178172 A JP2014178172 A JP 2014178172A JP 2016050667 A JP2016050667 A JP 2016050667A
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Prior art keywords
ring
axial
peripheral
fitting
encoder
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JP6398484B2 (en
JP2016050667A5 (en
Inventor
明伸 高山
Akinobu TAKAYAMA
明伸 高山
幸久 高山
Yukihisa Takayama
幸久 高山
石川 寛朗
Hiroo Ishikawa
寛朗 石川
迫田 裕成
Hiroshige Sakota
裕成 迫田
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日本精工株式会社
Nsk Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72Sealings
    • F16C33/723Shaft end sealing means, e.g. cup-shaped caps or covers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72Sealings
    • F16C33/76Sealings of ball or roller bearings
    • F16C33/768Sealings of ball or roller bearings between relatively stationary parts, i.e. static seals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00Articles relating to transporting
    • F16C2326/01Parts of vehicles in general
    • F16C2326/02Wheel hubs or castors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72Sealings
    • F16C33/76Sealings of ball or roller bearings
    • F16C33/78Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007Encoders, e.g. parts with a plurality of alternating magnetic poles

Abstract

PROBLEM TO BE SOLVED: To realize a structure of a rolling bearing unit with an encoder, capable of ensuring sufficient sealability between a seal material disposed on an outer peripheral face of a cap and an inner peripheral face of an outer ring.SOLUTION: A fitting cylindrical portion 21a constituting a cap 20a is composed of a main body cylindrical portion 24a internally fitted and fixed to a first fitting face 23 formed on an inner peripheral face of an axial inner end part of an outer ring 2 by interference fitting, and a non-contact cylindrical portion 25a disposed at an axial inner side with respect to the main body cylindrical portion 24a, and not kept in contact with the inner peripheral face of the outer ring 2. Further a seal material 26a is fixed to an outer peripheral face of the non-contact cylindrical portion 25a, and the seal material 26a is composed of a lip main body 27a having a substantially trapezoidal cross-sectional shape, and kept in contact with a seal face 50 having an inner diameter dimension larger than the first fitting face 23a of the inner peripheral face of the outer ring 2 at its tip edge, and an auxiliary lip 49 formed on a radial outer part in an extended state, and kept in contact with a chamfer portion 52 formed on an axial inner side of the seal face 50 at its axial side face in a used state.SELECTED DRAWING: Figure 3

Description

本発明は、例えば自動車の車輪を懸架装置に対し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に利用する、エンコーダ付転がり軸受ユニットの改良に関する。   The present invention relates to an improvement in a rolling bearing unit with an encoder that supports, for example, a wheel of an automobile so as to be rotatable with respect to a suspension device and is used for detecting the rotational speed of the wheel.
自動車の懸架装置に車輪を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回転速度検出装置を備えた転がり軸受ユニットとして、従来から各種構造のものが知られている。何れの構造の場合も、車輪と共に回転するハブの一部に支持固定したエンコーダの被検出面に、回転しない部分に支持固定したセンサの検出部を対向させている。そして、エンコーダの回転に伴って変化する、センサの出力信号の周波数又は周期に基づいて、エンコーダと共に回転する車輪の回転速度を求める様に構成している。   2. Description of the Related Art Conventionally, various types of rolling bearing units have been known as rolling bearing units that support a wheel on an automobile suspension so as to be rotatable and also include a rotation speed detection device for detecting the rotation speed of the wheel. In any structure, the detection part of the sensor supported and fixed to the non-rotating part is opposed to the detection surface of the encoder supported and fixed to a part of the hub that rotates together with the wheel. And it is comprised so that the rotational speed of the wheel which rotates with an encoder may be calculated | required based on the frequency or the period of the output signal of a sensor which changes with rotation of an encoder.
この様な回転速度検出装置付転がり軸受ユニットを構成するエンコーダが、泥水や塵埃等の付着により損傷する事を防止する為、又は、エンコーダに磁性粉等の異物が付着して、このエンコーダを利用した回転速度検出の信頼性が損なわれる事を防止する為、キャップ(カバー)等を用いてエンコーダを外部から隔てる構造が、従来から考えられている。図6、7は、特許文献1に記載された従来構造の1例を示している。   Use this encoder to prevent the encoders that make up such a rolling bearing unit with a rotational speed detector from being damaged by adhesion of muddy water or dust, or when foreign particles such as magnetic powder adhere to the encoder. In order to prevent the reliability of the detected rotation speed from being impaired, a structure in which the encoder is separated from the outside using a cap (cover) or the like has been conventionally considered. 6 and 7 show an example of a conventional structure described in Patent Document 1. FIG.
従来構造のエンコーダ付転がり軸受ユニット1は、外輪2の内径側にハブ3を、複数個の転動体4、4を介して回転自在に支持して成る。このうちの外輪2は、外周面に懸架装置であるナックル5に支持固定する為の静止側フランジ6を、内周面に複列の外輪軌道7a、7bを、それぞれ設けている。又、前記ハブ3は、外周面に複列の内輪軌道8a、8bと、車輪やディスクブレーキを構成するロータを支持固定する為の回転側フランジ9を設けている。又、前記各転動体4、4は、前記両外輪軌道7a、7bと前記両内輪軌道8a、8bとの間に、各列に複数個ずつ、転動自在に設けられている。   A rolling bearing unit 1 with an encoder having a conventional structure is configured such that a hub 3 is rotatably supported via a plurality of rolling elements 4 and 4 on the inner diameter side of an outer ring 2. Of these, the outer ring 2 is provided with a stationary flange 6 on the outer peripheral surface for supporting and fixing to a knuckle 5 as a suspension device, and double row outer ring raceways 7a and 7b on the inner peripheral surface. Further, the hub 3 is provided with double row inner ring raceways 8a and 8b and a rotation side flange 9 for supporting and fixing a rotor constituting a wheel and a disc brake on the outer peripheral surface. Further, a plurality of rolling elements 4, 4 are provided between the outer ring raceways 7a, 7b and the inner ring raceways 8a, 8b so as to be freely rollable in each row.
前記ハブ3は、ハブ本体10と内輪11とを結合固定して成る。このうちのハブ本体10は、外周面のうち、軸方向外端寄り部分(軸方向に関して外とは、ナックル5に組み付けた状態で車体の幅方向外側となる側を言い、各図の左側。反対に、車体の幅方向中央側となる、各図の右側を、軸方向に関して内と言う。本明細書及び特許請求の範囲全体で同じ。)に前記回転側フランジ9を、同じく軸方向中間部に前記両内輪軌道8a、8bのうちの軸方向外側の内輪軌道8aを、同じく軸方向内端寄り部分に小径段部12を、それぞれ設けている。又、前記内輪11は、外周面に、前記両内輪軌道8a、8bのうちの軸方向内側の内輪軌道8bを設けている。この様な内輪11は、前記ハブ本体10の小径段部12に外嵌固定した状態で、この内輪11の軸方向内端面を、このハブ本体10の軸方向内端部に形成したかしめ部13により抑え付けて、このハブ本体10に対し結合固定している。   The hub 3 is formed by coupling and fixing a hub body 10 and an inner ring 11. Of these, the hub body 10 is a portion closer to the outer end in the axial direction on the outer peripheral surface (outside with respect to the axial direction means the outer side in the width direction of the vehicle body when assembled to the knuckle 5 and is the left side of each figure. On the contrary, the right side of each figure, which is the center side in the width direction of the vehicle body, is referred to as the inside in the axial direction (the same applies to the entire specification and claims). The inner ring raceway 8a on the outer side in the axial direction of the inner ring raceways 8a and 8b is provided in the portion, and the small-diameter step portion 12 is provided on the portion closer to the inner end in the axial direction. In addition, the inner ring 11 is provided with an inner ring raceway 8b on the outer peripheral surface on the inner side in the axial direction of the inner ring raceways 8a and 8b. Such an inner ring 11 is in a state of being fitted and fixed to the small-diameter step portion 12 of the hub main body 10, and a caulking portion 13 in which the axial inner end surface of the inner ring 11 is formed at the axial inner end portion of the hub main body 10. The hub body 10 is coupled and fixed to the hub body 10.
前記内輪11の軸方向内半部に設けられた肩部14には、エンコーダ15を外嵌固定している。これにより、このエンコーダ15を、前記ハブ3に対し、このハブ3と同心に支持固定している。このエンコーダ15は、断面L字形で全体を円環状とした支持環16と、この支持環16に固定された永久磁石製のエンコーダ本体17とから成る。このエンコーダ本体17は、軸方向に着磁すると共に、着磁方向を円周方向に関して交互に且つ等間隔に変化させる事で、被検出面である軸方向内側面に、S極とN極とを交互に且つ等間隔に配置している。   An encoder 15 is externally fitted and fixed to a shoulder 14 provided in the inner half of the inner ring 11 in the axial direction. Thus, the encoder 15 is supported and fixed to the hub 3 concentrically with the hub 3. The encoder 15 includes a support ring 16 which is L-shaped in cross section and has an annular shape as a whole, and an encoder body 17 made of a permanent magnet fixed to the support ring 16. The encoder body 17 is magnetized in the axial direction, and by alternately changing the magnetization direction in the circumferential direction at equal intervals, the S pole and the N pole Are arranged alternately and at equal intervals.
又、前記外輪2の軸方向外端部の内周面と前記ハブ3の軸方向中間部の外周面との間にシールリング18を装着して、これら両周面同士の間に存在する内部空間19の軸方向外側開口を塞いでいる。これに対し、この内部空間19の軸方向内側開口を、キャップ(内側キャップ)20により塞いでいる。   Further, a seal ring 18 is mounted between the inner peripheral surface of the outer end portion in the axial direction of the outer ring 2 and the outer peripheral surface of the intermediate portion in the axial direction of the hub 3, and the inner portion existing between the two peripheral surfaces. The axially outer side opening of the space 19 is blocked. On the other hand, the axially inner side opening of the inner space 19 is closed by a cap (inner cap) 20.
前記キャップ20は、オーステナイト系ステンレス鋼板に、プレス加工を施して成るもので、全体を有底円筒状に構成しており、軸方向に伸長する嵌合筒部21と、この嵌合筒部21の軸方向内端縁から径方向内方に向けて伸長する底板部22とを備える。このうちの嵌合筒部21は、軸方向外側部分に設けられ、前記外輪2の軸方向内端寄り部分の内周面に形成された第一嵌合面23に締り嵌めにより内嵌固定された本体筒部24と、軸方向内側部分に設けられ、軸方向内方に向かう程径方向内方に向かう方向に傾斜した、部分円すい筒状の非接触筒部25とを備えている。この非接触筒部25は、前記キャップ20の装着状態で、前記外輪2の内周面とは接触しない。又、このキャップ20の装着状態で、前記底板部22の軸方向外側面(内部空間19側の面)を、前記エンコーダ本体17の被検出面に対し、微小隙間を介して近接対向させている。   The cap 20 is formed by subjecting an austenitic stainless steel plate to press working. The cap 20 has a bottomed cylindrical shape as a whole, and includes a fitting tube portion 21 extending in the axial direction, and the fitting tube portion 21. And a bottom plate portion 22 extending radially inward from the axial inner end edge. Of these, the fitting cylinder portion 21 is provided on the outer portion in the axial direction, and is fitted and fixed to the first fitting surface 23 formed on the inner peripheral surface of the outer ring 2 near the inner end in the axial direction by an interference fit. And a non-contact cylindrical portion 25 having a partially conical cylindrical shape, which is provided in an axially inner portion and is inclined in a radially inward direction as it goes inward in the axial direction. The non-contact cylindrical portion 25 does not contact the inner peripheral surface of the outer ring 2 when the cap 20 is attached. When the cap 20 is mounted, the outer surface in the axial direction (the surface on the inner space 19 side) of the bottom plate portion 22 is closely opposed to the detected surface of the encoder body 17 through a minute gap. .
前記非接触筒部25の外周面には、ゴム製のシール材26が加硫接着により固定されている。このシール材26には、自由状態で、前記嵌合筒部21(本体筒部24)の外径寸法よりも大きな外径寸法を有する、リップ本体27が設けられている。そして、前記キャップ20を装着した状態で、このリップ本体27の先端縁(外周縁)を、前記第一嵌合面23に対し締め代を有する状態で接触させている。   A rubber sealing material 26 is fixed to the outer peripheral surface of the non-contact cylindrical portion 25 by vulcanization adhesion. The sealing material 26 is provided with a lip main body 27 having an outer diameter larger than the outer diameter of the fitting cylinder 21 (main cylinder 24) in a free state. Then, with the cap 20 mounted, the tip edge (outer peripheral edge) of the lip body 27 is brought into contact with the first fitting surface 23 with a tightening margin.
上述の様な構成を有するキャップ20の軸方向内側には、センサ保持部材(外側キャップ)28が設けられている。このセンサ保持部材28は、回転速度を検出する為のセンサ29を保持する為に利用するもので、前記外輪2の内周面のうち、前記キャップ20が内嵌固定された部分よりも軸方向内側に内嵌固定されている。前記センサ保持部材28は、金属板にプレス加工を施して成るもので、全体を有底円筒状に構成しており、軸方向に伸長した円筒部30と、この円筒部30の軸方向内端縁から径方向内方に向けて伸長した底部31とを備えている。この様な構成を有する前記センサ保持部材28は、前記外輪2に装着した状態で、前記円筒部30の軸方向外半部を、この外輪2の軸方向内端部内周面に形成された第二嵌合面32に締り嵌めにより内嵌固定すると共に、前記円筒部30の軸方向中間部に形成された外向フランジ部33の軸方向外側面を、前記外輪2の軸方向内端面に突き当てている。又、前記底部31のうち、軸方向に関して前記エンコーダ本体17の被検出面と対向する部分に、貫通孔34を形成しており、この貫通孔34内に前記センサ29の検出部を挿入している。又、前記底部31のうち、この貫通孔34よりも径方向内方部分に、取付孔35を形成している。そして、前記底部31の軸方向外側面のうちで、この取付孔35の周囲部分に、ナット36をかしめ固定している。   A sensor holding member (outer cap) 28 is provided on the axially inner side of the cap 20 having the above-described configuration. The sensor holding member 28 is used to hold a sensor 29 for detecting the rotation speed, and is axially more than the portion of the inner peripheral surface of the outer ring 2 where the cap 20 is fitted and fixed. Internally fitted and fixed. The sensor holding member 28 is formed by pressing a metal plate, and has a bottomed cylindrical shape as a whole, and includes a cylindrical portion 30 that extends in the axial direction and an inner end in the axial direction of the cylindrical portion 30. And a bottom 31 extending radially inward from the edge. The sensor holding member 28 having such a configuration is configured such that the axially outer half portion of the cylindrical portion 30 is formed on the inner peripheral surface of the axially inner end portion of the outer ring 2 in a state of being mounted on the outer ring 2. While the inner fitting is fixed to the two fitting surfaces 32 by an interference fit, the axially outer side surface of the outward flange portion 33 formed at the axially intermediate portion of the cylindrical portion 30 is abutted against the axially inner end surface of the outer ring 2. ing. A through hole 34 is formed in a portion of the bottom portion 31 facing the detected surface of the encoder body 17 in the axial direction, and the detection portion of the sensor 29 is inserted into the through hole 34. Yes. Further, a mounting hole 35 is formed in the bottom portion 31 in the radially inner portion of the through hole 34. A nut 36 is caulked and fixed around the mounting hole 35 in the outer side surface of the bottom portion 31 in the axial direction.
前記センサ29は、その検出部を前記貫通孔34に挿通した状態で、取付ボルト55を前記ナット36に螺合し締め付ける事により、前記センサ保持部材28に保持されている。又、この状態で、前記センサ29の検出部を、前記底板部22の軸方向内側面(外面)に近接対向させている。これにより、この検出部を、この底板部22を介して、前記エンコーダ本体17の被検出面に対向させている。この結果、このエンコーダ本体17が、前記ハブ3と共に回転すると、前記センサ29の検出部の近傍を前記被検出面に存在するS極とN極とが交互に通過し、このセンサ29の出力が変化する為、前記ハブ3に固定した車輪の回転速度を求める事が可能になる。又、従来構造の場合、前記エンコーダ本体17を、前記キャップ20により外部から隔てている為、前記エンコーダ本体17の被検出面に、異物が付着する事を防止できる。この為、この被検出面が清浄な状態に保たれ、前記エンコーダ本体17を利用した回転速度検出の信頼性確保が図られる。   The sensor 29 is held by the sensor holding member 28 by screwing a mounting bolt 55 into the nut 36 and tightening the sensor 29 in a state where the detection portion is inserted through the through hole 34. Further, in this state, the detection portion of the sensor 29 is made to face and oppose the axial inner side surface (outer surface) of the bottom plate portion 22. Thus, the detection unit is opposed to the detection surface of the encoder body 17 through the bottom plate part 22. As a result, when the encoder body 17 rotates together with the hub 3, the S pole and the N pole existing on the detected surface pass alternately in the vicinity of the detection portion of the sensor 29, and the output of the sensor 29 is Therefore, the rotational speed of the wheel fixed to the hub 3 can be obtained. In the case of the conventional structure, since the encoder body 17 is separated from the outside by the cap 20, it is possible to prevent foreign matter from adhering to the detection surface of the encoder body 17. For this reason, the surface to be detected is kept clean, and the reliability of rotation speed detection using the encoder body 17 is ensured.
但し、上述した様な従来構造の場合には、前記シール材26による密封性能を十分に確保する面からは改良の余地がある。
即ち、前記シール材26を、前記キャップ20を構成する嵌合筒部21(非接触筒部25)の外周面に加硫接着により固定する作業は、一般的に、この嵌合筒部21の内径側に内型を挿入すると共に、外型をこの嵌合筒部21に軸方向内側から挿入して外嵌した状態で行われる。この為、加硫接着後、外型を軸方向内側に取り外す(無理抜きする)必要上、前記嵌合筒部21の外周面からの前記リップ本体27の突出量を大きくする事は難しくなる。従って、このリップ本体27に、前記外輪2の内周面に対する大きな締め代を持たせる事が難しくなり、前記シール材26による密封性能が低くなり易くなる。
However, in the case of the conventional structure as described above, there is room for improvement in terms of sufficiently securing the sealing performance by the sealing material 26.
That is, the operation of fixing the sealing material 26 to the outer peripheral surface of the fitting cylinder portion 21 (non-contact cylinder portion 25) constituting the cap 20 is generally performed by vulcanization bonding. The inner mold is inserted on the inner diameter side, and the outer mold is inserted into the fitting tube portion 21 from the inner side in the axial direction and fitted. For this reason, it is difficult to increase the protruding amount of the lip main body 27 from the outer peripheral surface of the fitting cylinder portion 21 because it is necessary to remove (forcibly remove) the outer mold in the axial direction after vulcanization adhesion. Therefore, it is difficult to give the lip body 27 a large fastening allowance for the inner peripheral surface of the outer ring 2, and the sealing performance by the sealing material 26 tends to be lowered.
更に、例えば特許文献2に記載される様に、前記嵌合筒部21を構成する本体筒部24の外周面に傷等の損傷が生じる事を防止すべく、前記外輪2の内周面のうちで、この本体筒部24が内嵌固定される前記第一嵌合面23よりも軸方向内側部分の内径寸法を、この第一嵌合面23の内径寸法よりも大きくする事が考えられている。この様な構成を採用すれば、前記キャップ20の装着作業(圧入作業)時に、前記本体筒部24の外周面が、前記外輪2の内周面の一部(例えば研削面同士の繋ぎ目部分)と接触する事を防止できる為、前記本体筒部24の外周面に傷等の損傷が生じる事は防止できる。しかしながら、前記リップ本体27の締め代の更なる低下に繋がり、このリップ本体27の先端縁と前記外輪2の内周面との間に微小隙間が形成される可能性がある。この様な微小隙間が形成された場合には、毛細管現象によって当該部分に水分が吸収され易い状態になり、前記シール材26の密封性能を確保する事は難しくなる。   Further, as described in, for example, Patent Document 2, in order to prevent damage such as scratches from occurring on the outer peripheral surface of the main body cylindrical portion 24 constituting the fitting cylindrical portion 21, the inner peripheral surface of the outer ring 2 is prevented. Of these, it is conceivable that the inner diameter dimension of the inner portion in the axial direction of the first fitting surface 23 to which the main body cylinder portion 24 is fitted and fixed is made larger than the inner diameter dimension of the first fitting surface 23. ing. If such a configuration is adopted, the outer peripheral surface of the main body cylinder portion 24 is a part of the inner peripheral surface of the outer ring 2 (for example, a joint portion between the grinding surfaces) when the cap 20 is attached (press-fit operation). ), It is possible to prevent damage such as scratches on the outer peripheral surface of the main body cylinder portion 24. However, the tightening allowance of the lip body 27 is further reduced, and there is a possibility that a minute gap is formed between the tip edge of the lip body 27 and the inner peripheral surface of the outer ring 2. When such a minute gap is formed, moisture is easily absorbed by the portion due to the capillary phenomenon, and it becomes difficult to ensure the sealing performance of the sealing material 26.
特開2013−194861号公報JP 2013-194461 A 国際公開第2011/086982号International Publication No. 2011/086982
本発明は、上述の様な事情に鑑み、エンコーダを外部から隔てる為に用いるキャップの外周面に設けるシール材と外輪の内周面との間の密封性能を十分に確保できる、エンコーダ付転がり軸受ユニットの構造を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 provides a rolling bearing with an encoder that can sufficiently ensure a sealing performance between a sealing material provided on an outer peripheral surface of a cap used for separating the encoder from the outside and an inner peripheral surface of an outer ring. It was invented to realize the structure of the unit.
本発明のエンコーダ付転がり軸受ユニットは、例えばナックル等の使用時にも回転しない部分に対して車輪(従動輪)を回転自在に支持する為に使用するもので、外輪と、ハブと、複数個の転動体と、エンコーダと、キャップと、センサ保持部材とを備える。
このうちの外輪は、内周面に複列の外輪軌道を有しており、使用時に例えばナックル等の懸架装置に支持された状態で回転しない。
又、前記ハブは、例えばハブ本体の軸方向内端部にこのハブ本体とは別体の内輪を組み合わせて構成されるもので、外周面に複列の内輪軌道を有しており、前記外輪の内径側にこの外輪と同心に支持されている。又、例えば、外周面のうちでこの外輪の軸方向外端部よりも軸方向外方に突出した部分に、車輪を支持する為の回転側フランジを設けている。
又、前記各転動体は、例えば玉、円筒ころ(ニードルを含む)、円すいころ又は球面ころ等であり、前記両外輪軌道と前記両内輪軌道との間に、各列に複数個ずつ、転動自在に設けられている。
又、前記キャップは、非磁性板製で、有底円筒状に構成されており、軸方向に伸長する嵌合筒部と、この嵌合筒部の軸方向内端縁から径方向内方に向けて伸長する底板部とを有し、前記外輪の軸方向内端寄り部分に内嵌固定されている。
更に、前記センサ保持部材は、前記外輪のうちで、前記キャップが内嵌固定された部分よりも軸方向内側に内嵌固定され、前記エンコーダの被検出面に対し前記底板部を介して検出部を軸方向に対向させる状態でセンサを保持する。
The rolling bearing unit with an encoder of the present invention is used for rotatably supporting a wheel (driven wheel) with respect to a portion that does not rotate even when a knuckle or the like is used, for example, an outer ring, a hub, and a plurality of A rolling element, an encoder, a cap, and a sensor holding member are provided.
Among these, the outer ring has a double row outer ring raceway on the inner peripheral surface, and does not rotate while being supported by a suspension device such as a knuckle during use.
The hub is configured by combining, for example, an inner end of the hub body in the axial direction with an inner ring separate from the hub body, and has a double row of inner ring raceways on the outer peripheral surface. The inner ring is supported concentrically with the outer ring. Further, for example, a rotation-side flange for supporting the wheel is provided in a portion of the outer peripheral surface that protrudes outward in the axial direction from the outer end portion in the axial direction of the outer ring.
Each of the rolling elements is, for example, a ball, a cylindrical roller (including a needle), a tapered roller or a spherical roller, and a plurality of rolling elements are provided in each row between the outer ring raceway and the inner ring raceway. It is provided freely.
The cap is made of a non-magnetic plate and has a bottomed cylindrical shape. The fitting cylinder portion extends in the axial direction, and radially inward from the axial inner end edge of the fitting cylinder portion. And a bottom plate portion extending toward the inner ring, and is fitted and fixed to a portion near the inner end in the axial direction of the outer ring.
Further, the sensor holding member is fitted and fixed on the inner side in the axial direction than the portion of the outer ring where the cap is fitted and fixed, and the detection portion is connected to the detection surface of the encoder via the bottom plate portion. The sensor is held in a state where the is opposed in the axial direction.
特に本発明のエンコーダ付転がり軸受ユニットの場合には、前記嵌合筒部を、前記外輪の軸方向内端寄り部分の内周面に形成された第一嵌合面に対し締り嵌めにより内嵌固定される本体筒部と、この本体筒部よりも軸方向内側に設けられ、前記外輪の内周面と接触しない非接触筒部とを有するものとしている。
又、この非接触筒部の外周面に、弾性材製のシール材を固定している。
又、このシール材を、例えば断面略台形状や断面略三角形状等のリップ本体(ノーズガスケット)と、このリップ本体よりも軸方向内側に設けられ、径方向外方に向けて延出した補助リップ(ラジアルリップ)とを有するものとしている。
そして、このうちのリップ本体の先端縁(外周縁)を、前記外輪の内周面のうちで前記第一嵌合面の軸方向内側に隣接する部分に形成された、この第一嵌合面よりも内径寸法の大きいシール面に対し、全周に亙り接触させている。
又、前記補助リップの一部を、前記外輪の内周面のうちで前記シール面と前記センサ保持部材を内嵌固定した第二嵌合面との間部分(例えば面取り部、段差部、傾斜面、平坦面等)に対し全周に亙り接触させている。
尚、前記非接触筒部の形状は特に限定されず、この非接触筒部を、例えば部分円すい筒部と円筒部とから構成する事もできるし、部分円すい筒部のみ、又は、その他の形状を有する筒部等から構成する事ができる。
又、本発明を実施する場合、追加的に、前記補助リップを、自由状態で、キャップの中心軸に直交する仮想平面と平行に延出させる(軸方向には傾斜させずに径方向外方にのみ延出させる)事ができる。そして、前記キャップの装着状態で、前記補助リップを軸方向に弾性的に傾斜させて、この補助リップの一部(側面)を、前記シール面と前記第二嵌合面との間部分に接触させる事ができる。
又、追加的に、自由状態での補助リップの先端縁の径方向位置を、自由状態でのリップ本体の先端縁の径方向位置よりも径方向外方に位置させる事ができる。
更に、追加的に、前記第二嵌合面の内径寸法を、前記シール面の内径寸法よりも大きくする事ができる。
In particular, in the case of the rolling bearing unit with an encoder according to the present invention, the fitting cylinder portion is fitted into the first fitting surface formed on the inner circumferential surface of the outer ring near the axial inner end by an interference fit. The main body cylinder part to be fixed and the non-contact cylinder part which is provided on the inner side in the axial direction than the main body cylinder part and does not contact the inner peripheral surface of the outer ring are provided.
An elastic sealing material is fixed to the outer peripheral surface of the non-contact cylindrical portion.
In addition, the sealing material is provided with a lip body (nose gasket) having a substantially trapezoidal cross section or a substantially triangular cross section, for example, and an auxiliary that is provided on the inner side in the axial direction than the lip body and extends outward in the radial direction. It has a lip (radial lip).
Of these, the first fitting surface formed on the tip edge (outer circumferential edge) of the lip main body at a portion of the inner circumferential surface of the outer ring adjacent to the inner side in the axial direction of the first fitting surface. A seal surface having a larger inner diameter than the entire circumference is brought into contact with the entire circumference.
In addition, a part of the auxiliary lip is a portion (for example, a chamfered portion, a stepped portion, an inclined portion) between the seal surface and the second fitting surface on which the sensor holding member is fitted and fixed in the inner peripheral surface of the outer ring. Surface, flat surface, etc.) over the entire circumference.
The shape of the non-contact cylindrical portion is not particularly limited, and the non-contact cylindrical portion can be constituted by, for example, a partial conical cylindrical portion and a cylindrical portion, only a partial conical cylindrical portion, or other shapes. It can comprise from the cylinder part etc. which have.
Further, when the present invention is carried out, the auxiliary lip is extended in a free state in parallel with a virtual plane orthogonal to the central axis of the cap (outward in the radial direction without being inclined in the axial direction). Can only be extended). Then, with the cap attached, the auxiliary lip is elastically inclined in the axial direction, and a part (side surface) of the auxiliary lip is brought into contact with a portion between the seal surface and the second fitting surface. You can make it.
In addition, the radial position of the distal end edge of the auxiliary lip in the free state can be positioned radially outward from the radial position of the distal end edge of the lip body in the free state.
In addition, the inner diameter of the second fitting surface can be made larger than the inner diameter of the seal surface.
上述の様な構成を有する本発明のエンコーダ付転がり軸受ユニットを実施する場合には、例えば請求項2に記載した発明の様に、前記補助リップの先端部を段付き形状とし、この補助リップの先端部の軸方向内側部分に、軸方向外側部分に比べて径方向外方に延出した薄肉延長部を設ける構成を、追加的に採用する事ができる。
又、この様な薄肉延長部を前記センサ保持部材の一部と接触させる構成を、追加的に採用する事もできる。
When implementing the rolling bearing unit with an encoder of the present invention having the above-described configuration, for example, as in the invention described in claim 2, the tip of the auxiliary lip has a stepped shape, and the auxiliary lip A configuration in which a thin extension portion extending radially outward as compared to the axially outer portion is provided on the axially inner portion of the tip portion can be additionally employed.
Moreover, the structure which makes such a thin extension part contact with a part of said sensor holding member can also be employ | adopted additionally.
以上の様な構成を有する本発明のエンコーダ付転がり軸受ユニットによれば、キャップの外周面に設けるシール材と外輪の内周面との間の密封性能を十分に確保できる。
即ち、本発明の場合には、前記シール材に、前記外輪の内周面に形成されたシール面と接触する断面略台形状のリップ本体だけでなく、径方向外方に向けて延出し、前記外輪の内周面のうちで前記シール面とセンサ保持部材を内嵌固定した第二嵌合面との間部分に接触する、補助リップを設けている。この為、この補助リップによって、前記リップ本体による密封性能を補う事が可能になる。従って、本発明によれば、前記シール材と前記外輪の内周面との間の密封性能を十分に確保できる。
According to the rolling bearing unit with an encoder of the present invention having the above-described configuration, it is possible to sufficiently ensure the sealing performance between the sealing material provided on the outer peripheral surface of the cap and the inner peripheral surface of the outer ring.
That is, in the case of the present invention, the sealing material extends not only in a substantially trapezoidal cross-sectional lip body in contact with the sealing surface formed on the inner peripheral surface of the outer ring, but also in a radially outward direction, An auxiliary lip is provided in contact with a portion of the inner peripheral surface of the outer ring between the seal surface and a second fitting surface on which the sensor holding member is fitted and fixed. For this reason, this auxiliary lip can supplement the sealing performance of the lip body. Therefore, according to the present invention, it is possible to sufficiently secure the sealing performance between the sealing material and the inner peripheral surface of the outer ring.
又、請求項2に記載した発明によれば、前記キャップの装着状態で、前記補助リップを構成する薄肉延長部により、この補助リップの一部と相手面(シール面と第二嵌合面との間部分)との接触部分を覆い、保護する事が可能になる。   According to the second aspect of the present invention, a part of the auxiliary lip and a mating surface (a seal surface and a second fitting surface) are formed by the thin extension portion that constitutes the auxiliary lip when the cap is attached. It is possible to cover and protect the contact part with the intermediate part).
本発明の実施の形態の第1例を示す、エンコーダ付転がり軸受ユニットの断面図。Sectional drawing of the rolling bearing unit with an encoder which shows the 1st example of embodiment of this invention. 同じく図1の右上部拡大図。Similarly the upper right part enlarged view of FIG. 同じく図1の右下部(鉛直方向下端部)拡大図。Similarly, the lower right part (vertical lower end part) enlarged view of FIG. 本発明の実施の形態の第2例を示す、図3に相当する図。The figure equivalent to FIG. 3 which shows the 2nd example of embodiment of this invention. 同じく第3例を示す、図3に相当する図。The figure corresponding to FIG. 3 which shows a 3rd example similarly. 従来構造のエンコーダ付転がり軸受ユニットを示す断面図。Sectional drawing which shows the rolling bearing unit with an encoder of the conventional structure. 同じく図6のA部拡大図。The A section enlarged view of FIG. 6 similarly.
[実施の形態の第1例]
本発明の実施の形態の第1例に就いて、図1〜3を参照しつつ説明する。尚、本発明の特徴は、キャップ20aの外周面に設けたシール材26aと外輪2の内周面との間の密封性を確保する為の構造にある。又、本例を含め、その他の実施の形態の各例の場合にも、図面中には、シール材の形状として、自由状態での形状を実線で示しており、弾性変形した状態での形状を破線で示している。
[First example of embodiment]
A first example of the embodiment of the present invention will be described with reference to FIGS. The feature of the present invention lies in the structure for ensuring the sealing performance between the sealing material 26a provided on the outer peripheral surface of the cap 20a and the inner peripheral surface of the outer ring 2. Also in each example of the other embodiments including this example, the shape in the free state is shown by a solid line as the shape of the sealing material in the drawing, and the shape in the elastically deformed state. Is indicated by a broken line.
本例のエンコーダ付転がり軸受ユニット1aは、所謂第3世代と呼ばれるもので、外輪2の内径側にハブ3を、複数個の転動体(玉)4、4を介して回転自在に支持して成る。このうちの外輪2は、外周面に懸架装置であるナックル5(図6参照)に支持固定する為の静止側フランジ6(図6参照)を、内周面に複列の外輪軌道7a、7bを、それぞれ設けている。又、本例の場合、前記外輪2の軸方向内端側部分(ナックルパイロット部)の内周面に、軸方向外側から順に、内径寸法が順次大きくなる、3つの円筒面(単一円筒面)である、第一嵌合面23a、シール面50、及び、第二嵌合面32aを形成している。又、前記外輪2の内周面のうち、これらシール面50と第二嵌合面32aとの間部分に、逃げ凹溝51を形成しており、この逃げ凹溝51と前記シール面50との連続部に面取り部52を形成している。前記ハブ3は、外周面に複列の内輪軌道8a、8bと、車輪やディスクブレーキを構成するロータを支持固定する為の回転側フランジ9を設けている。又、前記各転動体4、4は、前記両外輪軌道7a、7bと前記両内輪軌道8a、8bとの間に、各列に複数個ずつ、それぞれ保持器37、37により転動自在に保持された状態で設けられている。
尚、図示の例では、前記各転動体4、4として玉を使用しているが、重量が嵩む自動車の転がり軸受ユニットの場合には、各転動体として円すいころを使用する場合もある。
The rolling bearing unit with an encoder 1a of this example is a so-called third generation, and supports the hub 3 on the inner diameter side of the outer ring 2 so as to be rotatable via a plurality of rolling elements (balls) 4 and 4. Become. Of these, the outer ring 2 has a stationary flange 6 (see FIG. 6) for supporting and fixing to a knuckle 5 (see FIG. 6) as a suspension device on the outer peripheral surface, and double-row outer ring raceways 7a and 7b on the inner peripheral surface. Are provided. Further, in the case of this example, three cylindrical surfaces (single cylindrical surface) whose inner diameter dimension sequentially increases from the outer side in the axial direction on the inner peripheral surface of the inner end side portion (knuckle pilot portion) of the outer ring 2. The first fitting surface 23a, the seal surface 50, and the second fitting surface 32a are formed. Further, a clearance groove 51 is formed in the inner peripheral surface of the outer ring 2 between the sealing surface 50 and the second fitting surface 32a. The clearance groove 51 and the sealing surface 50 A chamfered portion 52 is formed in the continuous portion. The hub 3 is provided with double row inner ring raceways 8a and 8b and a rotation side flange 9 for supporting and fixing a rotor constituting a wheel and a disc brake on the outer peripheral surface. Further, a plurality of rolling elements 4, 4 are held between the outer ring raceways 7a, 7b and the inner ring raceways 8a, 8b by a plurality of cages 37, 37, respectively, so that they can roll freely. It is provided in the state that was done.
In the example shown in the drawing, balls are used as the rolling elements 4, 4. However, in the case of a rolling bearing unit for an automobile having a heavy weight, tapered rollers may be used as the rolling elements.
前記ハブ3は、ハブ本体10と内輪11とを結合固定して成る。このうちのハブ本体10は、外周面のうち、軸方向外端寄り部分に前記回転側フランジ9を、同じく軸方向中間部に前記両内輪軌道8a、8bのうちの軸方向外側の内輪軌道8aを、同じく軸方向内端寄り部分に小径段部12を、それぞれ設けている。又、前記内輪11は、円環状で、外周面に、前記両内輪軌道8a、8bのうちの軸方向内側の内輪軌道8bを設けている。この様な内輪11は、前記ハブ本体10の小径段部12に外嵌固定した状態で、この内輪11の軸方向内端面を、このハブ本体10の軸方向内端部に形成したかしめ部13により抑え付けて、このハブ本体10に対し結合固定している。尚、前記各転動体4、4及び前記内輪11は、SUJ2等の高炭素クロム軸受鋼から造られており、ズブ焼き入れ等が施されている。これに対し、前記ハブ本体10は、中炭素鋼(C:0.40〜0・80重量%)から造られており、外周面のうち前記かしめ部13を除く部分に、高周波焼き入れ処理が施されている。又、本例を実施する場合に、ハブの軸方向内端部に、かしめ部に代えて、雌ねじ部を形成する事で、この雌ねじ部に螺合したナットを用いて内輪の抜け止めを図る事もできる。   The hub 3 is formed by coupling and fixing a hub body 10 and an inner ring 11. Of these, the hub body 10 has the outer flange on the outer side near the axial end and the flange 9 on the rotation side, and the inner ring raceway 8a on the axially outer side of the inner ring raceways 8a and 8b. Similarly, a small-diameter step portion 12 is provided at a portion near the inner end in the axial direction. The inner ring 11 has an annular shape, and an inner ring raceway 8b on the inner side in the axial direction of the inner ring raceways 8a and 8b is provided on the outer peripheral surface. Such an inner ring 11 is in a state of being fitted and fixed to the small-diameter step portion 12 of the hub main body 10, and a caulking portion 13 in which the axial inner end surface of the inner ring 11 is formed at the axial inner end portion of the hub main body 10. The hub body 10 is coupled and fixed to the hub body 10. Each of the rolling elements 4, 4 and the inner ring 11 is made of high carbon chrome bearing steel such as SUJ2, and is tempered. On the other hand, the hub body 10 is made of medium carbon steel (C: 0.40-0.80% by weight), and the induction hardening process is performed on the outer peripheral surface excluding the caulking part 13. It has been subjected. In addition, when the present embodiment is implemented, an internal thread portion is formed instead of the caulking portion at the inner end portion in the axial direction of the hub, and the inner ring is prevented from coming off by using a nut screwed into the internal thread portion. You can also do things.
又、前記内輪11の軸方向内半部に設けられた肩部14には、エンコーダ15を外嵌固定している。これにより、このエンコーダ15を、前記ハブ3に対し、このハブ3と同心に支持固定している。このエンコーダ15は、断面L字形で全体を円環状とした支持環16と、この支持環16に固定されたエンコーダ本体17とから成る。このうちの支持環16は、フェライト系のステンレス鋼板や防錆処理を施した冷間圧延鋼板等の磁性金属板製で、プレス加工を施して成るものであり、前記肩部14に圧入される支持筒部38と、この支持筒部38の軸方向内端縁から径方向外方に直角に折れ曲がった円輪部39とを備える。前記エンコーダ本体17は、この円輪部39の軸方向内側面に固定されている。このエンコーダ本体17は、ゴム磁石等の永久磁石製で、円輪状に構成されており、軸方向に着磁すると共に、着磁方向を円周方向に関して交互に且つ等間隔に変化させる事により、被検出面である軸方向内側面に、S極とN極とを交互に且つ等間隔に配置している。   An encoder 15 is fitted and fixed to a shoulder portion 14 provided in the inner half of the inner ring 11 in the axial direction. Thus, the encoder 15 is supported and fixed to the hub 3 concentrically with the hub 3. The encoder 15 includes a support ring 16 that is L-shaped in cross section and has an annular shape as a whole, and an encoder body 17 that is fixed to the support ring 16. Of these, the support ring 16 is made of a magnetic metal plate such as a ferritic stainless steel plate or a cold-rolled steel plate subjected to rust prevention treatment, and is formed by pressing, and is press-fitted into the shoulder portion 14. The support cylinder part 38 and the annular ring part 39 bent at right angles outward in the radial direction from the axial inner end edge of the support cylinder part 38 are provided. The encoder body 17 is fixed to the inner side surface of the annular portion 39 in the axial direction. The encoder body 17 is made of a permanent magnet such as a rubber magnet and is formed in an annular shape. The encoder body 17 is magnetized in the axial direction, and the magnetizing direction is changed alternately and at equal intervals in the circumferential direction. S poles and N poles are alternately arranged at equal intervals on the inner side surface in the axial direction, which is the surface to be detected.
又、前記外輪2の軸方向外端部の内周面と前記ハブ3の軸方向中間部の外周面との間にシールリング18を装着して、これら両周面同士の間に存在する内部空間19の軸方向外側開口を塞いでいる。これに対し、この内部空間19の軸方向内側開口を、キャップ(内側キャップ)20aにより塞いでいる。これにより、前記内部空間19内に封入したグリースの漏洩防止と、外部からこの内部空間19に泥水や塵等の異物が侵入する事を防止している。   Further, a seal ring 18 is mounted between the inner peripheral surface of the outer end portion in the axial direction of the outer ring 2 and the outer peripheral surface of the intermediate portion in the axial direction of the hub 3, and the inner portion existing between the two peripheral surfaces. The axially outer side opening of the space 19 is blocked. On the other hand, the axially inner opening of the inner space 19 is closed by a cap (inner cap) 20a. This prevents leakage of grease sealed in the internal space 19 and prevents foreign matter such as muddy water and dust from entering the internal space 19 from the outside.
前記内部空間19の軸方向外側開口を塞ぐ前記シールリング18は、前記外輪2の軸方向外端部内周面に内嵌固定された断面L字形の芯金40と、この芯金40に支持されたゴム等の弾性材製の弾性材41とから構成されている。この弾性材41には、複数(図示の例では3本)のリップが設けられており、これら各リップの先端縁を前記ハブ3の外周面に全周に亙り接触させている。   The seal ring 18 that closes the axially outer opening of the internal space 19 is supported by the cored bar 40 having an L-shaped cross section that is fitted and fixed to the inner peripheral surface of the axially outer end of the outer ring 2. And an elastic material 41 made of an elastic material such as rubber. The elastic material 41 is provided with a plurality of (three in the illustrated example) lips, and the tip edges of these lips are brought into contact with the outer peripheral surface of the hub 3 over the entire circumference.
前記内部空間19の軸方向内側開口を塞ぐ前記キャップ20aは、回転速度検出用のセンサ29の検出性能に悪影響を与えない様に、SUS304等のオーステナイト系ステンレス鋼板、アルミニウム系合金板、合成樹脂板等の、非磁性板から造られており、板厚が一定である。前記キャップ20aは、全体を有底円筒状(断面略コ字形)に構成しており、軸方向に伸長する嵌合筒部21aと、この嵌合筒部21aの軸方向内端縁から径方向内方に向けて伸長する底板部22aとを備える。このうちの嵌合筒部21aは、軸方向外側半部に設けられた本体筒部24aと、軸方向内側半部に設けられ、前記キャップ20aの装着状態で前記外輪2の内周面とは接触しない、非接触筒部25aとから構成されている。このうちの本体筒部24aは、軸方向に亙り外径寸法が変化しない単一円筒状に構成されており、前記外輪2の軸方向内端寄り部分の内周面に形成された円筒面状の第一嵌合面23aに、締り嵌めにより内嵌固定されている。一方、前記非接触筒部25aは、前記本体筒部24aの軸方向内端縁に連続する状態で設けられ、軸方向内方に向かう程径方向内方に向かう方向に傾斜した部分円すい筒部42と、この部分円すい筒部42に連続する状態で設けられ、軸方向に亙り外径寸法が変化しない小径円筒部43とから構成されている。尚、前記非接触筒部25aの軸方向寸法は、前記キャップ20aを構成する板材の厚さ寸法の2倍以上、好ましくは3倍以上とする。これにより、前記嵌合筒部21aを前記第一嵌合面23aに締り嵌めで内嵌固定した際に、この嵌合筒部21aに加わる径方向内方に向いた力を、前記非接触筒部25aの変形に消費する事で、前記底板部22a(特に後述する外径側平板部44)に軸方向の変形が生じる事を有効に防止している。   The cap 20a that closes the axially inner opening of the internal space 19 has an austenitic stainless steel plate such as SUS304, an aluminum alloy plate, a synthetic resin plate so as not to adversely affect the detection performance of the sensor 29 for detecting the rotational speed. Etc., and is made of a non-magnetic plate, and the plate thickness is constant. The cap 20a has a bottomed cylindrical shape (substantially U-shaped cross section) as a whole, a fitting cylinder part 21a extending in the axial direction, and a radial direction from an axial inner end edge of the fitting cylinder part 21a. And a bottom plate portion 22a extending inward. Among these, the fitting cylinder part 21a is provided in the main body cylinder part 24a provided in the axially outer half part and in the axially inner half part, and the inner peripheral surface of the outer ring 2 in the mounted state of the cap 20a. It is comprised from the non-contact cylinder part 25a which does not contact. Of these, the main body cylinder portion 24a is formed in a single cylindrical shape whose outer diameter dimension does not change in the axial direction, and is a cylindrical surface shape formed on the inner peripheral surface of the outer ring 2 near the inner end in the axial direction. The first fitting surface 23a is internally fitted and fixed by interference fitting. On the other hand, the non-contact cylindrical portion 25a is provided in a state of being continuous with the axially inner end edge of the main body cylindrical portion 24a, and is a partial conical cylindrical portion that is inclined in a direction toward the radially inward as it goes inward in the axial direction. 42 and a small-diameter cylindrical portion 43 which is provided in a state of being continuous with the partial conical cylinder portion 42 and whose outer diameter dimension does not change in the axial direction. The axial dimension of the non-contact cylindrical portion 25a is at least twice, preferably at least three times the thickness dimension of the plate material constituting the cap 20a. Thereby, when the fitting tube portion 21a is fitted and fixed to the first fitting surface 23a by an interference fit, the radially inward force applied to the fitting tube portion 21a is applied to the non-contact tube. By consuming the deformation of the portion 25a, it is possible to effectively prevent the axial deformation of the bottom plate portion 22a (especially an outer diameter side flat plate portion 44 described later).
又、前記底板部22aは、全体を円板状に構成されており、外径側から順に、外径側平板部44と、筒状部45と、中間平板部46と、傾斜板部47と、中央平板部48とを備えている。前記外径側平板部44は、前記非接触筒部25a(小径円筒部43)の軸方向内端縁から径方向内方に折れ曲がる状態で設けられており、円輪状で、前記エンコーダ15の被検出面に対し近接対向する部分に設けられている。又、前記筒状部45は、円筒状で、前記かしめ部13を覆う様に、前記外径側平板部44の径方向内端縁から軸方向内方に折れ曲がる状態で設けられている。又、前記中間平板部46は、円輪状で、前記筒状部45の軸方向内端縁から径方向内方に折れ曲がる状態で設けられている。又、前記傾斜板部47は、軸方向外方に向かう程径方向内方に向かう方向に傾斜しており、前記中間平板部46の内周縁と前記中央平板部48の外周縁との間部分に設けられている。又、この中央平板部48は、円形板状で、前記傾斜板部47の軸方向外端縁から径方向内方に折れ曲がる状態で設けられている。   The bottom plate portion 22a is formed in a disc shape as a whole, and in order from the outer diameter side, an outer diameter side flat plate portion 44, a cylindrical portion 45, an intermediate flat plate portion 46, and an inclined plate portion 47, The central flat plate portion 48 is provided. The outer diameter side flat plate portion 44 is provided in a state of being bent radially inward from the axial inner end edge of the non-contact cylindrical portion 25a (small diameter cylindrical portion 43). It is provided in a portion that is in close proximity to the detection surface. The cylindrical portion 45 is cylindrical and is provided in a state of being bent inward in the axial direction from the radially inner end edge of the outer diameter side flat plate portion 44 so as to cover the caulking portion 13. The intermediate flat plate portion 46 has an annular shape and is provided in a state of being bent radially inward from the axial inner end edge of the cylindrical portion 45. The inclined plate portion 47 is inclined in the radially inward direction as it goes outward in the axial direction, and is a portion between the inner peripheral edge of the intermediate flat plate portion 46 and the outer peripheral edge of the central flat plate portion 48. Is provided. Further, the central flat plate portion 48 has a circular plate shape and is provided in a state of being bent radially inward from the axial outer end edge of the inclined plate portion 47.
又、本例の場合、前記嵌合筒部21aを構成する非接触筒部25aの外周面に、アクリロニトリルブタジエンゴム(NBR)、水素化アクリロニトリルブタジエンゴム(HNBR)、エチレンプロピレンゴム(EPDM)、ポリアクリルゴム(ACM)、フッ素ゴム(FKM)、シリコンゴム等の、弾性材製のシール材26aを、加硫接着により固定している。このシール材26aには、自由状態で、前記嵌合筒部21a(本体筒部24a)の外径寸法よりもそれぞれ大きな外径寸法を有する、リップ本体(ノーズガスケット)27a及び補助リップ(ラジアルリップ)49が、前記非接触筒部25aの外周面に固定されたシール基部に連続する状態で設けられている。このうちのリップ本体27aは、基端部から先端部に向かうに従って軸方向に関する厚さ寸法が減少する断面略台形状で、前記シール材26aの軸方向外側部分に設けられている。又、前記キャップ20aを前記外輪2に内嵌固定した状態で、前記リップ本体27aの先端縁(外周縁)を、この外輪2の内周面のうち、前記第一嵌合面23aの軸方向内側に隣接する部分に形成された、この第一嵌合面23よりも内径寸法の大きい、円筒面状のシール面50に対し全周に亙り締め代を有する状態で接触させている。前記補助リップ49は、厚さ寸法が基端部から先端部に亙り一定であり、自由状態で、前記キャップ20aの中心軸に直交する仮想平面と平行に延出(軸方向には傾斜せずに径方向外方にのみ延出)している。又、前記シール材26aの自由状態で、前記補助リップ49の先端縁の径方向位置を、前記リップ本体27aの先端縁の径方向位置よりも径方向外方に位置させている。そして、前記キャップ20aを前記外輪2に内嵌固定した状態で、前記補助リップ49の軸方向外側面の径方向外端部分を、この外輪2の内周面に形成された面取り部52に対し全周に亙り接触させている。又、この状態で、前記補助リップ49を、この補助リップ49の基端部と前記シール基部との連続部に設けたくびれ部を起点として、径方向外方に向かう程軸方向内方に向かう方向に弾性的に傾斜させている。前記面取り部52は、前記外輪2の内周面のうち、前記リップ本体27aを接触させる前記シール面50と、後述するセンサ保持部材28aを内嵌固定する円筒面状の第二嵌合面32aとの間部分、より具体的には、前記シール面50とこの第二嵌合面32aの軸方向外側に設けられた前記逃げ凹溝51との間部分に形成されており、その内周面形状を、軸方向内方に向かう程内径寸法が大きくなる方向に傾斜した部分円すい筒面としている。   In the case of this example, on the outer peripheral surface of the non-contact cylindrical portion 25a constituting the fitting cylindrical portion 21a, acrylonitrile butadiene rubber (NBR), hydrogenated acrylonitrile butadiene rubber (HNBR), ethylene propylene rubber (EPDM), poly A sealing material 26a made of an elastic material such as acrylic rubber (ACM), fluorine rubber (FKM), silicon rubber or the like is fixed by vulcanization adhesion. The sealing material 26a includes a lip body (nose gasket) 27a and an auxiliary lip (radial lip) which have a larger outer diameter than the outer diameter of the fitting cylinder 21a (main cylinder 24a) in a free state. 49) is provided in a state of being continuous with the seal base fixed to the outer peripheral surface of the non-contact cylindrical portion 25a. Of these, the lip main body 27a has a substantially trapezoidal cross section in which the thickness dimension in the axial direction decreases from the proximal end portion toward the distal end portion, and is provided in the axially outer portion of the sealing material 26a. In the state where the cap 20 a is fitted and fixed to the outer ring 2, the tip edge (outer circumferential edge) of the lip body 27 a is positioned in the axial direction of the first fitting surface 23 a among the inner circumferential surface of the outer ring 2. The cylindrical seal surface 50 having a larger inner diameter than that of the first fitting surface 23 formed in a portion adjacent to the inside is brought into contact with the entire circumference in a state having a tightening allowance. The auxiliary lip 49 has a constant thickness dimension from the base end portion to the tip end portion, and extends in a free state in parallel with a virtual plane orthogonal to the central axis of the cap 20a (not inclined in the axial direction). It extends only outward in the radial direction. Further, in the free state of the sealing material 26a, the radial position of the tip edge of the auxiliary lip 49 is positioned radially outward from the radial position of the tip edge of the lip body 27a. Then, in a state where the cap 20 a is fitted and fixed to the outer ring 2, the radially outer end portion of the auxiliary lip 49 on the outer side in the axial direction is opposed to the chamfered portion 52 formed on the inner peripheral surface of the outer ring 2. It is in contact with the entire circumference. Further, in this state, the auxiliary lip 49 starts from a constricted portion provided at a continuous portion of the base end portion of the auxiliary lip 49 and the seal base, and goes inward in the axial direction as it goes outward in the radial direction. Inclined elastically in the direction. The chamfered portion 52 is a cylindrical second fitting surface 32a for fitting and fixing the seal surface 50 that contacts the lip main body 27a and the sensor holding member 28a to be described later, of the inner peripheral surface of the outer ring 2. More specifically, a portion between the sealing surface 50 and the clearance groove 51 provided on the outer side in the axial direction of the second fitting surface 32a. The shape is a partially conical cylindrical surface that is inclined in a direction in which the inner diameter dimension increases as it goes inward in the axial direction.
又、本例の場合にも、上述の様な構成を有するキャップ20aの軸方向内側には、センサ保持部材(外側キャップ)28aを設けている。このセンサ保持部材28aは、回転速度を検出する為のセンサ29を保持する為に利用するもので、前記外輪2の内周面のうち、前記キャップ20aが内嵌固定された部分よりも軸方向内側に内嵌固定されている。前記センサ保持部材28aは、例えば防錆処理を施した冷間圧延鋼板にプレス加工を施して成るもので、全体を有底円筒状(断面略コ字形)に構成しており、軸方向に伸長した円筒部30aと、この円筒部30aの軸方向内端縁から径方向内方に向けて伸長した底部31aとを備えている。この様な構成を有する前記センサ保持部材28aは、前記外輪2に装着した状態で、前記円筒部30aの軸方向外半部を、この外輪2の軸方向内端部内周面に形成された円筒面状の第二嵌合面32aに締り嵌めにより内嵌固定すると共に、前記円筒部30aの軸方向中間部に形成された外向フランジ部(屈曲部)33aの軸方向外側面を、前記外輪2の軸方向内端面に突き当てている。又、前記底部31aのうち、軸方向に関して前記エンコーダ本体17の被検出面と対向する部分に、貫通孔34aを形成しており、この貫通孔34a内に前記センサ29の検出部を挿入している。又、前記底部31aのうち、この貫通孔34aよりも径方向内側部分に、取付孔35aを形成している。そして、この底部31aの軸方向外側面のうちで、この取付孔35aの周囲部分に、ナット36aをかしめ固定している。又、前記円筒部30aの軸方向内半部のうち、前記エンコーダ付転がり軸受ユニット1aを車体に組み付けた状態で、鉛直方向下方に位置する部分に、径方向に貫通した水抜き孔53を、1乃至複数個形成している。   Also in the case of this example, a sensor holding member (outer cap) 28a is provided on the inner side in the axial direction of the cap 20a having the above-described configuration. The sensor holding member 28a is used to hold the sensor 29 for detecting the rotation speed, and is axially more than the portion of the inner peripheral surface of the outer ring 2 where the cap 20a is fitted and fixed. Internally fitted and fixed. The sensor holding member 28a is formed by, for example, pressing a cold-rolled steel sheet that has been subjected to rust prevention treatment, and has a bottomed cylindrical shape (substantially U-shaped cross section), and extends in the axial direction. A cylindrical portion 30a, and a bottom portion 31a extending radially inward from the axial inner end edge of the cylindrical portion 30a. The sensor holding member 28a having such a configuration is a cylinder formed on the inner peripheral surface of the axially inner end portion of the outer ring 2 with the axially outer half portion of the cylindrical portion 30a being mounted on the outer ring 2. While the inner fitting is fixed to the planar second fitting surface 32a by interference fitting, the outer side surface of the outer ring 2 is formed on the axially outer surface of the outward flange portion (bent portion) 33a formed at the axially intermediate portion of the cylindrical portion 30a. It is abutted against the inner end face in the axial direction. A through hole 34a is formed in a portion of the bottom portion 31a that faces the detected surface of the encoder body 17 in the axial direction, and the detection portion of the sensor 29 is inserted into the through hole 34a. Yes. A mounting hole 35a is formed in the bottom portion 31a in the radially inner portion of the through hole 34a. And the nut 36a is caulked and fixed to the peripheral part of this attachment hole 35a among the axial direction outer surfaces of this bottom part 31a. Further, in the axially inner half portion of the cylindrical portion 30a, in the state where the rolling bearing unit with encoder 1a is assembled to the vehicle body, a drain hole 53 penetrating in the radial direction is formed in a portion positioned vertically downward. One or more are formed.
前記センサ29は、その検出部を前記貫通孔34aに挿通した状態で、取付ボルト55を前記ナット36aに螺合し締め付ける事により、前記センサ保持部材28aに保持されている。又、この状態で、前記センサ29の検出部を、前記底板部22aを構成する外径側平板部44の軸方向内側面(外面)に近接対向又は当接させている。これにより、この検出部を、この外径側平板部44を介して、前記エンコーダ本体17の被検出面に対向させている。この結果、本例の場合にも、このエンコーダ本体17が、前記ハブ3と共に回転すると、前記センサ29の検出部の近傍を前記被検出面に存在するS極とN極とが交互に通過し、このセンサ29の出力が変化する為、前記ハブ3に固定した車輪の回転速度を求める事が可能になる。   The sensor 29 is held by the sensor holding member 28a by screwing the mounting bolt 55 into the nut 36a and tightening it with the detecting portion inserted through the through hole 34a. Further, in this state, the detection portion of the sensor 29 is brought close to or in contact with the axial inner side surface (outer surface) of the outer diameter side flat plate portion 44 constituting the bottom plate portion 22a. Thereby, this detection part is made to oppose the to-be-detected surface of the said encoder main body 17 through this outer diameter side flat plate part 44. FIG. As a result, also in the case of this example, when the encoder body 17 rotates together with the hub 3, the S pole and the N pole existing on the detected surface pass alternately in the vicinity of the detection portion of the sensor 29. Since the output of the sensor 29 changes, the rotational speed of the wheel fixed to the hub 3 can be obtained.
特に本例の構造の場合には、前記キャップ20aの外周面に設けられた前記シール材26aと前記外輪2の内周面との間の密封性能を十分に確保できる。
即ち、本例の場合には、前記シール材26aに、前記外輪2の内周面に形成されたシール面50と接触する断面略台形状のリップ本体27aだけでなく、径方向外方に向けて延出し、前記外輪2の内周面のうちで前記シール面50と前記第二嵌合面32aとの間部分に形成された面取り部52に対し全周に亙り接触する、前記補助リップ49を設けている。この為、この補助リップ49によって、前記リップ本体27aによる密封性能を補う事が可能になる。より具体的には、図3に示した様に、前記キャップ20aを前記外輪2の軸方向内端寄り部分に内嵌固定した状態で、前記補助リップ49を、径方向外方に向かう程軸方向内方に向かう方向に弾性的に傾斜させている(部分円すい筒状に構成している)。従って、前記センサ保持部材28aの内側に泥水等が侵入した場合にも、この泥水は、前記キャップ20aを構成する底板部22aの軸方向内側面(外面)に沿って下方に流下した後、前記補助リップ49の軸方向内側面に沿って、前記リップ本体27aの先端縁と前記シール面50との接触部よりも径方向外方に導かれる。そして、前記センサ保持部材28aを構成する円筒部30aに形成した水抜き孔53を通じて、泥水を外部に排出する事が可能になる。この様に、本例のエンコーダ付転がり軸受ユニット1aによれば、前記シール材26aと前記外輪2の内周面との間の密封性能を十分に確保できる。
In particular, in the case of the structure of this example, it is possible to sufficiently ensure the sealing performance between the sealing material 26 a provided on the outer peripheral surface of the cap 20 a and the inner peripheral surface of the outer ring 2.
That is, in the case of the present example, not only the lip body 27a having a substantially trapezoidal cross section in contact with the sealing surface 50 formed on the inner peripheral surface of the outer ring 2 but also outward in the radial direction. The auxiliary lip 49 that extends over and contacts the chamfered portion 52 formed in the inner peripheral surface of the outer ring 2 between the seal surface 50 and the second fitting surface 32a. Is provided. For this reason, the auxiliary lip 49 can supplement the sealing performance of the lip body 27a. More specifically, as shown in FIG. 3, in the state where the cap 20a is fitted and fixed to a portion near the inner end in the axial direction of the outer ring 2, the auxiliary lip 49 is pivoted outward in the radial direction. Inclined elastically in the direction toward the inner side (configured in a partially conical cylinder shape). Therefore, even when muddy water or the like enters the inside of the sensor holding member 28a, the muddy water flows down along the inner side surface (outer surface) in the axial direction of the bottom plate portion 22a constituting the cap 20a. Along the axially inner side surface of the auxiliary lip 49, the auxiliary lip 49 is guided radially outward from the contact portion between the tip edge of the lip body 27 a and the seal surface 50. And it becomes possible to discharge muddy water to the outside through the drain hole 53 formed in the cylindrical portion 30a constituting the sensor holding member 28a. Thus, according to the rolling bearing unit with an encoder 1a of this example, a sufficient sealing performance between the sealing material 26a and the inner peripheral surface of the outer ring 2 can be secured.
しかも、本例の場合には、前記第一嵌合面23aの内径寸法よりも、前記シール面50及び前記第二嵌合面32aの内径寸法を大きくしている為、前記キャップ20aの圧入時に、前記本体筒部24aの外周面に、軸方向に長い傷を生じる事も防止できる。従って、この様にして生じる傷を通じて、前記内部空間19に異物が侵入する事も防止できる。   In addition, in the case of this example, since the inner diameter dimension of the seal surface 50 and the second fitting surface 32a is larger than the inner diameter dimension of the first fitting surface 23a, when the cap 20a is press-fitted. Further, it is possible to prevent a long scratch in the axial direction on the outer peripheral surface of the main body cylinder portion 24a. Therefore, it is possible to prevent foreign matter from entering the internal space 19 through the scratches generated in this way.
[実施の形態の第2例]
本発明の実施の形態の第2例に就いて、図4を参照しつつ説明する。本例の場合には、シール材26bを構成する補助リップ49aの先端部の形状を、上述した実施の形態の第1例の場合とは異ならせている。即ち、本例の場合には、前記補助リップ49aの先端部を段付き形状とし、この補助リップ49aの先端部の軸方向内側半部に、軸方向外側半部に比べて径方向外方に延出した薄肉延長部54を設けている。この様な薄肉延長部54は、図4に示した様に、前記補助リップ49aの軸方向外側面を面取り部52に接触させた状態で、この接触部を覆う様にして、この面取り部52に近づく方向に湾曲した(反った)形状になる。従って、前記補助リップ49aのうち、この面取り部52と接触する部分を、泥水等の異物から有効に保護する事が可能になる。
その他の部分の構成及び作用効果に就いては、前記実施の形態の第1例の場合と同様である。
[Second Example of Embodiment]
A second example of the embodiment of the present invention will be described with reference to FIG. In the case of this example, the shape of the tip of the auxiliary lip 49a constituting the sealing material 26b is different from that of the first example of the above-described embodiment. That is, in the case of this example, the tip of the auxiliary lip 49a has a stepped shape, and the tip of the tip of the auxiliary lip 49a has an inner half in the axial direction and radially outward compared to the outer half in the axial direction. An extended thin extension 54 is provided. As shown in FIG. 4, such a thin extension portion 54 covers the chamfered portion 52 so as to cover the contact portion with the axially outer side surface of the auxiliary lip 49 a in contact with the chamfered portion 52. It becomes a curved shape (curved) in a direction approaching. Therefore, the portion of the auxiliary lip 49a that contacts the chamfered portion 52 can be effectively protected from foreign matter such as muddy water.
Other configurations and operational effects are the same as those in the first example of the embodiment.
[実施の形態の第3例]
本発明の実施の形態の第3例に就いて、図5を参照しつつ説明する。本例の場合には、上述した実施の形態の第2例と同様の補助リップ49aを備えたシール材26bを使用しているが、このシール材26bを構成する薄肉延長部54を、センサ保持部材28bの一部に接触させている。即ち、本例の場合には、このセンサ保持部材28bを構成する円筒部30bの軸方向外端部に、軸方向外側に向かう程径方向内方に向けて折れ曲がった折れ曲がり部55を形成し、この折れ曲がり部55の内周面に対し、前記薄肉延長部54の先端縁(外周縁)を全周に亙り接触させている。具体的には、前記センサ保持部材28bを、外輪2の軸方向内端部に内嵌固定する際に、前記折れ曲がり部55により前記薄肉延長部54を軸方向外方に弾性変形させ、この薄肉延長部54を弾性復元させる事で、この薄肉延長部54の先端縁を、前記折れ曲がり部55の内周面に接触させている。
[Third example of embodiment]
A third example of the embodiment of the present invention will be described with reference to FIG. In the case of this example, the seal material 26b provided with the auxiliary lip 49a similar to the second example of the above-described embodiment is used, but the thin extension 54 constituting the seal material 26b is attached to the sensor. It is made to contact a part of member 28b. That is, in the case of this example, a bent portion 55 is formed at the outer end in the axial direction of the cylindrical portion 30b that constitutes the sensor holding member 28b. The distal end edge (outer peripheral edge) of the thin extension 54 is brought into contact with the inner peripheral surface of the bent portion 55 over the entire periphery. Specifically, when the sensor holding member 28b is fitted and fixed to the inner end portion in the axial direction of the outer ring 2, the thin extension portion 54 is elastically deformed outward in the axial direction by the bent portion 55, and this thin wall By elastically restoring the extension portion 54, the tip edge of the thin extension portion 54 is brought into contact with the inner peripheral surface of the bent portion 55.
以上の様な構成を有する本例の場合には、前記外輪2の内周面のうち、前記円筒部30bを内嵌固定する第二嵌合面32aの軸方向外側に隣接する部分に設けられた逃げ凹溝51に、泥水等の異物が溜まる事を有効に防止できる。従って、前記センサ保持部材28bに錆が生じる事を有効に防止できて、このセンサ保持部材28bの嵌合保持力が低下する事を長期間に亙り有効に防止できる。
その他の構成及び作用効果に就いては、前述した実施の形態の第1例及び第2例の場合と同様である。
In the case of this example having the above-described configuration, the outer ring 2 is provided in a portion adjacent to the outer side in the axial direction of the second fitting surface 32a for fitting and fixing the cylindrical portion 30b. It is possible to effectively prevent foreign matter such as muddy water from accumulating in the escape recess 51. Accordingly, it is possible to effectively prevent the sensor holding member 28b from being rusted, and to effectively prevent the fitting holding force of the sensor holding member 28b from being lowered over a long period of time.
About another structure and an effect, it is the same as that of the case of the 1st example and 2nd example of embodiment mentioned above.
本発明は、ハブ本体と内輪とをナットにより結合固定して成る、エンコーダ付転がり軸受ユニットで実施する事もできる。又、本発明を実施する場合に、キャップ及びセンサ保持部材の形状並びにこのセンサ保持部材に対するセンサの保持構造(支持構造)は、前述した実施の形態の各例の構造に限定されず、発明の要旨を変更しない範囲で、任意に変更及び選択する事ができる。   The present invention can also be implemented by a rolling bearing unit with an encoder, in which a hub body and an inner ring are coupled and fixed by a nut. Further, when the present invention is carried out, the shape of the cap and the sensor holding member and the sensor holding structure (support structure) with respect to the sensor holding member are not limited to the structure of each example of the above-described embodiment. Changes and selections can be made as long as the gist is not changed.
1、1a 車輪支持用転がり軸受ユニット
2 外輪
3 ハブ
4 転動体
5 ナックル
6 静止側フランジ
7a、7b 外輪軌道
8a、8b 内輪軌道
9 回転側フランジ
10 ハブ本体
11 内輪
12 小径段部
13 かしめ部
14 肩部
15 エンコーダ
16 支持環
17 エンコーダ本体
18 シールリング
19 内部空間
20、20a キャップ(内側キャップ)
21、21a 嵌合筒部
22、22a 底板部
23、23a 第一嵌合面
24、24a 本体筒部
25、25a 非接触筒部
26、26a、26b シール材
27、27a リップ本体
28、28a、28b センサ保持部材(外側キャップ)
29 センサ
30、30a、30b 円筒部
31、31a 底部
32、32a 第二嵌合面
33、33a 外向フランジ部
34、34a 貫通孔
35、35a 取付孔
36、36a ナット
37 保持器
38 支持筒部
39 円輪部
40 芯金
41 弾性材
42 部分円すい筒部
43 小径円筒部
44 外径側平板部
45 筒状部
46 中間平板部
47 傾斜板部
48 中央平板部
49、49a 補助リップ
50 シール面
51 逃げ凹溝
52 面取り部
53 水抜き孔
54 薄肉延長部
55 取付ボルト
DESCRIPTION OF SYMBOLS 1, 1a Rolling bearing unit for wheel support 2 Outer ring 3 Hub 4 Rolling body 5 Knuckle 6 Static side flange 7a, 7b Outer ring raceway 8a, 8b Inner ring raceway 9 Rotating side flange 10 Hub body 11 Inner ring 12 Small diameter step part 13 Caulking part 14 Shoulder Part 15 Encoder 16 Support ring 17 Encoder body 18 Seal ring 19 Internal space 20, 20a Cap (inner cap)
21, 21a Fitting cylinder part 22, 22a Bottom plate part 23, 23a First fitting surface 24, 24a Body cylinder part 25, 25a Non-contact cylinder part 26, 26a, 26b Sealing material 27, 27a Lip body 28, 28a, 28b Sensor holding member (outer cap)
29 Sensor 30, 30a, 30b Cylindrical part 31, 31a Bottom part 32, 32a Second fitting surface 33, 33a Outward flange part 34, 34a Through hole 35, 35a Mounting hole 36, 36a Nut 37 Cage 38 Supporting cylinder part 39 yen Ring part 40 Metal core 41 Elastic material 42 Partial conical cylinder part 43 Small diameter cylindrical part 44 Outer diameter side flat plate part 45 Cylindrical part 46 Intermediate flat plate part 47 Inclined plate part 48 Central flat plate part 49, 49a Auxiliary lip 50 Seal surface 51 Relief Groove 52 Chamfer 53 Water drain hole
54 Thin extension 55 Mounting bolt

Claims (2)

  1. 内周面に複列の外輪軌道を有し、使用時にも回転しない外輪と、
    外周面に複列の内輪軌道を有し、この外輪の内径側にこの外輪と同心に支持されたハブと、
    前記両外輪軌道と前記両内輪軌道との間に、両列に複数個ずつ転動自在に設けられた転動体と、
    軸方向内側面の磁気特性を円周方向に関して交互に変化させて成り、前記ハブの軸方向内端部にこのハブと同心に支持された、円環状のエンコーダと、
    軸方向に伸長する嵌合筒部と、この嵌合筒部の軸方向内端縁から径方向内方に向けて伸長する底板部とを有し、前記外輪の軸方向内端寄り部分に内嵌固定される、非磁性板製で有底円筒状のキャップと、
    前記外輪のうちでこのキャップが内嵌固定された部分よりも軸方向内側に内嵌固定され、前記エンコーダの被検出面に対し前記底板部を介して検出部を軸方向に対向させる状態でセンサを保持するセンサ保持部材と、
    を備えたエンコーダ付転がり軸受ユニットであって、
    前記嵌合筒部が、前記外輪の軸方向内端寄り部分の内周面に形成された第一嵌合面に対し締り嵌めにより内嵌固定される本体筒部と、この本体筒部よりも軸方向内側に設けられ、前記外輪の内周面と接触しない非接触筒部とを有しており、
    この非接触筒部の外周面には、弾性材製のシール材が固定されており、
    このシール材は、リップ本体と、このリップ本体よりも軸方向内側に設けられ、径方向外方に向けて延出した補助リップとを有しており、このうちのリップ本体の先端縁を、前記外輪の内周面のうちで前記第一嵌合面の軸方向内側に隣接する部分に形成されたこの第一嵌合面よりも内径寸法の大きいシール面に対し全周に亙り接触させており、前記補助リップの一部を、前記外輪の内周面のうちでこのシール面と前記センサ保持部材を内嵌固定した第二嵌合面との間部分に対し全周に亙り接触させている、
    事を特徴とするエンコーダ付転がり軸受ユニット。
    An outer ring having a double-row outer ring raceway on the inner peripheral surface and not rotating during use;
    A hub having a double-row inner ring raceway on the outer peripheral surface and supported concentrically with the outer ring on the inner diameter side of the outer ring;
    Between the both outer ring raceways and the both inner ring raceways, a plurality of rolling elements provided so as to be freely rollable in both rows,
    An annular encoder that is formed by alternately changing the magnetic properties of the inner surface in the axial direction with respect to the circumferential direction, and is supported concentrically with the hub at the inner end in the axial direction of the hub;
    A fitting cylinder portion extending in the axial direction; and a bottom plate portion extending radially inward from an inner edge in the axial direction of the fitting cylinder portion; A non-magnetic plate-made bottomed cylindrical cap that is fitted and fixed,
    A sensor in which the cap is fitted and fixed inward in the axial direction with respect to the portion where the cap is fitted and fixed in the outer ring, and the detection portion is opposed to the detection surface of the encoder in the axial direction through the bottom plate portion. A sensor holding member for holding
    A rolling bearing unit with an encoder comprising:
    A main body cylinder portion in which the fitting cylinder portion is fitted and fixed by an interference fit to a first fitting surface formed on an inner peripheral surface of the outer ring in the axial direction inner end portion, than the main body cylinder portion. A non-contact cylindrical portion that is provided on the inner side in the axial direction and does not contact the inner peripheral surface of the outer ring,
    A sealing material made of an elastic material is fixed to the outer peripheral surface of the non-contact cylindrical portion,
    This sealing material has a lip body and an auxiliary lip that is provided on the inner side in the axial direction than the lip body and extends outward in the radial direction. Out of the inner peripheral surface of the outer ring, contact is made over the entire circumference with a seal surface having a larger inner diameter than the first fitting surface formed in a portion adjacent to the inner side in the axial direction of the first fitting surface. A portion of the auxiliary lip is brought into contact with the entire circumference of the inner circumferential surface of the outer ring between the seal surface and the second fitting surface on which the sensor holding member is fitted and fixed. Yes,
    Rolling bearing unit with encoder characterized by this.
  2. 前記補助リップの先端部が段付き形状であり、この補助リップの先端部の軸方向内側部分に、軸方向外側部分に比べて径方向外方に延出した薄肉延長部が設けられている、請求項1に記載したエンコーダ付転がり軸受ユニット。   The tip of the auxiliary lip has a stepped shape, and a thin-walled extension that extends radially outward compared to the axially outer portion is provided at the axially inner portion of the tip of the auxiliary lip. The rolling bearing unit with an encoder according to claim 1.
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Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2008164004A (en) * 2006-12-27 2008-07-17 Ntn Corp Bearing device for wheel
JP2012232708A (en) * 2011-05-09 2012-11-29 Nsk Ltd Wheel-supporting rolling bearing unit
JP2013028248A (en) * 2011-07-28 2013-02-07 Ntn Corp Bearing device for wheel
JP2013194861A (en) * 2012-03-21 2013-09-30 Ntn Corp Bearing device for wheel
JP2015172401A (en) * 2014-03-12 2015-10-01 Ntn株式会社 Bearing device for wheel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008164004A (en) * 2006-12-27 2008-07-17 Ntn Corp Bearing device for wheel
JP2012232708A (en) * 2011-05-09 2012-11-29 Nsk Ltd Wheel-supporting rolling bearing unit
JP2013028248A (en) * 2011-07-28 2013-02-07 Ntn Corp Bearing device for wheel
JP2013194861A (en) * 2012-03-21 2013-09-30 Ntn Corp Bearing device for wheel
JP2015172401A (en) * 2014-03-12 2015-10-01 Ntn株式会社 Bearing device for wheel

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