JP4286063B2 - Bearing device with built-in rotation speed sensor - Google Patents

Bearing device with built-in rotation speed sensor Download PDF

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Publication number
JP4286063B2
JP4286063B2 JP2003154381A JP2003154381A JP4286063B2 JP 4286063 B2 JP4286063 B2 JP 4286063B2 JP 2003154381 A JP2003154381 A JP 2003154381A JP 2003154381 A JP2003154381 A JP 2003154381A JP 4286063 B2 JP4286063 B2 JP 4286063B2
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Prior art keywords
cover
outer ring
encoder
sensor
shaft member
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JP2004354299A (en
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公治 上谷
孝幸 乗松
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NTN Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings 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
    • F16C19/18—Bearings 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
    • F16C19/181—Bearings 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
    • F16C19/183—Bearings 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
    • F16C19/184—Bearings 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
    • F16C19/186—Bearings 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、自動車の車輪を回転自在に支持する軸受装置のうち、特に車輪の回転速度を検出するセンサを内蔵した回転速度センサ内蔵軸受装置に関する。
【０００２】
【従来の技術】
最近の自動車には、ＡＢＳ（アンチロックブレーキシステム）やＴＣＳ（トラクションコントロールシステム）を装備したものが増えてきている。これらの制御システムを備えた自動車では、通常、車輪用の軸受装置として、制御に必要な車輪の回転速度を検出するためのセンサを内蔵したものが使用されている。
【０００３】
この種の回転速度センサ内蔵軸受装置の一例を図３に示す。この軸受装置は、図３（ａ）に示すように、外輪５１と、外輪５１の内周側に挿入された状態で回転する軸部材５２と、外輪５１と軸部材５２との間に転動自在に配された玉５３と、軸部材５２の一端部に固定されたエンコーダ５４と、外輪５１の一端部に装着されて外輪５１の一端の開口を塞ぐカバー５５と、カバー５５と一体にモールドされたカバー補強材５６と、カバー５５にエンコーダ５４の一部と対向するように取り付けられたセンサ５７とで基本的に構成されている。そして、外輪５１および軸部材５２をそれぞれ図示省略した懸架装置および車輪に固定することにより、車輪を懸架装置に対して回転自在に支持するとともに、センサ５７でエンコーダ５４の回転により発生する磁界変動を検出し、これを回転速度に比例する電気信号に変換して図示省略したＡＢＳやＴＣＳの制御部に出力するようになっている。
【０００４】
また、図３（ｂ）に示すように、前記カバー５５へのセンサ５７の取付けは、カバー５５の厚み方向に貫通するセンサ取付穴５８にセンサ５７の挿入部５７ａを挿入することによって行っており、センサ５７の挿入部５７ａの外周面に設けた環状溝５９にＯリング６０を組み込むことにより、センサ取付穴５８から装置内部への異物の侵入の防止を図っている。
【０００５】
この例のように、自動車の脚まわりで使用される回転速度センサ内蔵軸受装置では、泥水等の異物が装置内部に侵入しないように、カバーを貫通するセンサ取付穴にＯリング等のゴム製のシール部材を組み込んでいる場合が多い（例えば、特許文献１参照。）。
【０００６】
【特許文献１】
特開平１０−３１９０２７号公報
【０００７】
【発明が解決しようとする課題】
しかしながら、上述したような従来の軸受装置では、Ｏリング等のゴム製のシール部材が、組込時の捩じれや締め代の不足により十分なシール性を得られず、装置内部へ泥水等の異物が侵入してしまうことがある。また、長期間使用しているうちに、劣化（硬化、ひび割れ）によって異物が侵入するようになることもある。装置内部へ異物が侵入すると、転動体と外輪または軸部材との間に異物が巻き込まれて軸受としての寿命が短くなるだけでなく、センサやエンコーダに異物が付着することにより、回転速度の検出精度が低下してＡＢＳやＴＣＳが正常に作動しなくなるおそれもある。
【０００８】
そこで、この発明の課題は、シール性に優れた回転速度センサ内蔵軸受装置を提供することである。
【０００９】
【課題を解決するための手段】
上記の課題を解決するため、この発明は、固定部材に固定される金属製の外輪と、外輪の内周側に挿入された状態で回転する軸部材と、前記外輪と軸部材との間に転動自在に配された複数の転動体と、前記軸部材の一端部に固定されたエンコーダと、前記外輪の一端部に装着されて外輪の一端の開口を塞ぐ合成樹脂製のカバーと、このカバーと一体にモールドされたカバー補強材と、前記カバーのセンサ取付穴に前記エンコーダの一部と対向するように取り付けられ、エンコーダの回転による磁界変動を検出して回転速度に比例する信号を出力するセンサとを備えた回転速度センサ内蔵軸受装置において、前記カバーは、有蓋円筒状に形成されその筒部が前記外輪の一端部の内周に圧入されるものとし、前記カバー補強材を非磁性金属材料で有蓋円筒状に形成し、このカバー補強材を前記カバーの筒部内周面から蓋部内側面にかけてモールドして、カバー補強材の蓋部で前記センサ取付穴の前記エンコーダと対向する側の開口を塞いだ構成を採用したのである。
【００１０】
すなわち、カバーのセンサ取付穴のエンコーダと対向する側の開口を、非磁性材料で有蓋円筒状に形成したカバー補強材の蓋部で塞ぐことにより、回転速度の検出精度に影響を及ぼすことなく、センサ取付穴がカバーを貫通しないようにして、装置内部への異物の侵入経路を減らし、装置全体のシール性を向上させたのである。
【００１１】
【発明の実施の形態】
以下、図面に基づき、この発明の実施形態を説明する。この回転速度センサ内蔵軸受装置は、自動車の車輪用で、図１に示すように、外輪１と、外輪１の内周側に挿入された状態で回転する軸部材２と、外輪１と軸部材２との間に転動自在に配された複数の転動体としての玉３と、軸部材２の一端部に固定されたエンコーダ４と、外輪１の一端部に装着されて外輪１の一端の開口を塞ぐカバー５と、このカバー５と一体にモールドされたカバー補強材としての芯金６と、カバー５にエンコーダ４の一部と対向するように取り付けられたセンサ７とで基本的に構成され、センサ７でエンコーダ４の回転により発生する磁界変動を検出し、これを回転速度に比例する電気信号に変換して図示省略したＡＢＳやＴＣＳの制御部に出力するものである。
【００１２】
前記外輪１は、一端側の外周面に設けた取付部１ａを懸架装置（図示省略）にボルト止めされて固定されるようになっている。一方、前記軸部材２は、他端側の外周面にフランジ８ａを有するハブ８と、ハブ８の一端側の外周に取り付けられた内輪９とからなり、ハブ８のフランジ８ａをハブボルト１０により図示省略した車輪に固定される。これらの外輪１および軸部材２は、金属製で、外輪１とハブ８との間および外輪１と内輪９との間に、保持器１１に保持された複数の玉３が１列ずつ配されている。また、外輪１の他端側内周面とハブ８の外周面との間の隙間は、シール装置１２により塞がれている。
【００１３】
前記エンコーダ４は、内輪９の一端部外周に嵌め込まれる筒状の取付部４ａと、取付部４ａの一端の鍔部に取り付けられたエンコーダ本体４ｂとからなる。エンコーダ本体４ｂは、ゴム磁石、焼結磁石、樹脂製磁石等の永久磁石を環状に形成して、円周方向に交互にＳ極とＮ極とが現れるように着磁したもので、円周方向の回転によって磁界変動を生じるようになっている。なお、エンコーダ本体としては、ギア型のパルサリングを使用することもできる。
【００１４】
前記カバー５は、合成樹脂で有蓋円筒状に形成されており、その筒部５ａが外輪１の一端部の内周に圧入されて外輪１に装着され、蓋部５ｂで外輪１の一端の開口を塞いでいる。筒部５ａには外輪１の一端面と当接するフランジ１３が形成されており、これによりカバー５全体が外輪１に対して軸方向に精度よく位置決めされ、カバー５に取り付けたセンサ７の位置管理が容易に行える。
【００１５】
また、図２にも示すように、カバー５の蓋部５ｂには筒状のセンサ取付部１４が設けられ、その内周側に形成されたセンサ取付穴１５にセンサ７の挿入部７ａが挿入されるようになっている。一方、カバー５には、その筒部５ａ内周面から蓋部５ｂ内側面にかけて、有蓋円筒状に形成された芯金６が一体にモールドされており、この芯金６の蓋部６ａによってセンサ取付穴１５のエンコーダ４と対向する側の開口が塞がれている。
【００１６】
前記芯金６は、厚さが約０．３ｍｍの非磁性鋼（この例では、SUS 430 ）の板材で形成されており、蓋部６ａを有している分、従来の円筒状のものよりもカバー５の強度を高めることができる。また、非磁性であるため、回転速度の検出精度には影響を及ぼさない。なお、芯金の材質は、非磁性鋼に限らず、磁性がなく、補強材としての強度を有するものであればよい。また、蓋部の厚みも、センサの挿入部とエンコーダ本体との間隔を変えない範囲で変更が可能である。
【００１７】
前記センサ７は、外装部分が合成樹脂製で、挿入部７ａをカバー５のセンサ取付穴１５に挿入することによりカバー５に取り付けられている。その挿入部７ａは、芯金６の蓋部６ａを挟んでエンコーダ本体４ｂの一部と所定の間隔をおいて対向しており、エンコーダ本体４ｂとの対向面の近傍に、エンコーダ４の回転によって発生する磁界変動を検出する検出部（図示省略）を内蔵している。この検出部は、センサ７内で出力ケーブル１６の一端部に接続されており、検出した磁界変動を回転速度に比例する電気信号に変換した後、この電気信号をケーブル１６を介して出力するようになっている。
【００１８】
この軸受装置は、上記の構成であり、カバー５のセンサ取付穴１５のエンコーダ４と対向する側の開口を、非磁性鋼板で有蓋円筒状に形成した芯金６の蓋部６ａで塞いでいるので、従来の装置に比べて、センサ取付穴がカバーを貫通していない分、装置内部への異物の侵入経路が少なく、装置全体のシール性が優れている。
【００１９】
なお、この発明は、実施形態で説明した自動車の車輪用に限らず、異物の侵入の可能性が高い場所で使用される回転速度センサ内蔵軸受装置に有効に適用することができる。
【００２０】
【発明の効果】
以上のように、この発明は、回転速度センサ内蔵軸受装置のカバー補強材を非磁性材料で有蓋円筒状に形成し、その蓋部でカバーのセンサ取付穴のエンコーダと対向する側の開口を塞いで、センサ取付穴がカバーを貫通しないようにしたので、装置内部への異物の侵入経路を減らし、装置全体のシール性を向上させることができる。
【００２１】
従って、軸受装置の寿命を延長することができるとともに、長期間にわたって回転速度の検出精度の低下を防止でき、検出した回転速度を用いて制御を行うシステムの安定化を図ることができる。
【００２２】
また、Ｏリング等のシール部材を削減できるので、装置の構造および組立作業が簡単になり、コストの低減も図れる。
【図面の簡単な説明】
【図１】実施形態の回転速度センサ内蔵軸受装置の正面断面図
【図２】図１の軸受装置の要部拡大断面図
【図３】ａは従来の回転速度センサ内蔵軸受装置の正面断面図、ｂはａの要部拡大断面図
【符号の説明】
１ 外輪
１ａ 取付部
２ 軸部材
３ 玉
４ エンコーダ
４ａ 取付部
４ｂ 本体
５ カバー
５ａ 筒部
５ｂ 蓋部
６ 芯金
６ａ 蓋部
７ センサ
７ａ 挿入部
８ ハブ
８ａ フランジ
９ 内輪
１０ ハブボルト
１１ 保持器
１２ シール装置
１３ フランジ
１４ センサ取付部
１５ 取付穴
１６ ケーブル[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device with a built-in rotation speed sensor that includes a sensor for detecting the rotation speed of a wheel, among bearing devices that rotatably support a wheel of an automobile.
[0002]
[Prior art]
In recent automobiles, those equipped with ABS (anti-lock brake system) and TCS (traction control system) are increasing. In automobiles equipped with these control systems, a bearing device for a wheel is usually used which has a sensor for detecting the rotational speed of a wheel necessary for control.
[0003]
An example of this type of bearing device with a built-in rotational speed sensor is shown in FIG. As shown in FIG. 3A, this bearing device rolls between an outer ring 51, a shaft member 52 that rotates while being inserted on the inner peripheral side of the outer ring 51, and the outer ring 51 and the shaft member 52. A ball 53 arranged freely, an encoder 54 fixed to one end of the shaft member 52, a cover 55 attached to one end of the outer ring 51 and closing an opening of one end of the outer ring 51, and a mold integrally with the cover 55 The cover reinforcing member 56 and the sensor 57 attached to the cover 55 so as to face a part of the encoder 54 are basically configured. Then, by fixing the outer ring 51 and the shaft member 52 to the suspension device and the wheel (not shown) respectively, the wheel is supported rotatably with respect to the suspension device, and the magnetic field fluctuation generated by the rotation of the encoder 54 is detected by the sensor 57. This is detected, converted into an electrical signal proportional to the rotational speed, and output to an ABS or TCS control unit (not shown).
[0004]
3B, the sensor 57 is attached to the cover 55 by inserting an insertion portion 57a of the sensor 57 into a sensor attachment hole 58 that penetrates the cover 55 in the thickness direction. Further, by incorporating an O-ring 60 into an annular groove 59 provided on the outer peripheral surface of the insertion portion 57a of the sensor 57, intrusion of foreign matters from the sensor mounting hole 58 into the apparatus is attempted.
[0005]
As shown in this example, in a bearing device with a built-in rotational speed sensor used around the legs of an automobile, a sensor mounting hole that penetrates the cover is made of rubber such as an O-ring so that foreign matter such as muddy water does not enter the inside of the device. In many cases, a seal member is incorporated (for example, see Patent Document 1).
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-319027
[Problems to be solved by the invention]
However, in the conventional bearing device as described above, a rubber seal member such as an O-ring cannot obtain a sufficient sealing performance due to twisting during mounting or insufficient tightening allowance, and foreign matter such as muddy water enters the device. May intrude. In addition, foreign matter may enter due to deterioration (hardening, cracking) during long-term use. If foreign matter enters the inside of the device, foreign matter gets caught between the rolling elements and the outer ring or shaft member, which not only shortens the service life of the bearing, but also detects the rotational speed by attaching foreign matter to the sensor or encoder. There is also a risk that the accuracy will be reduced and the ABS and TCS will not operate normally.
[0008]
Therefore, an object of the present invention is to provide a bearing device with a built-in rotational speed sensor that is excellent in sealing performance.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a metal outer ring fixed to a fixing member, a shaft member rotating in a state of being inserted on the inner peripheral side of the outer ring, and between the outer ring and the shaft member. A plurality of rolling elements arranged to be freely rollable, an encoder fixed to one end portion of the shaft member, a cover made of synthetic resin that is attached to one end portion of the outer ring and closes an opening of one end of the outer ring, Cover reinforcement material molded integrally with the cover, and attached to the sensor mounting hole of the cover so as to face a part of the encoder, detects a magnetic field variation due to the rotation of the encoder and outputs a signal proportional to the rotation speed In the bearing device with a built-in rotation speed sensor, the cover is formed in a covered cylindrical shape, and its cylindrical portion is press-fitted into the inner periphery of one end portion of the outer ring. a metal material Formed in the lid cylinder, the cover reinforcing material is molded over the lid portion side from the cylinder inner peripheral surface of the cover, closing the encoder and the side facing the opening of the sensor mounting hole in the lid of the cover stiffeners The configuration was adopted.
[0010]
That is, by covering the opening of the cover sensor mounting hole on the side facing the encoder with a lid portion of a cover reinforcing material formed in a covered cylindrical shape with a nonmagnetic material, without affecting the detection accuracy of the rotational speed, By preventing the sensor mounting hole from penetrating the cover, the entry path of foreign matter into the inside of the device was reduced, and the sealing performance of the entire device was improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. This bearing device with a built-in rotational speed sensor is for an automobile wheel, and as shown in FIG. 1, an outer ring 1, a shaft member 2 that rotates while being inserted on the inner peripheral side of the outer ring 1, an outer ring 1, and a shaft member. A ball 3 as a plurality of rolling elements arranged so as to roll freely between the two, an encoder 4 fixed to one end of the shaft member 2, and one end of the outer ring 1 attached to one end of the outer ring 1. The cover 5 is basically composed of a cover 5 for closing the opening, a cored bar 6 as a cover reinforcing member molded integrally with the cover 5, and a sensor 7 attached to the cover 5 so as to face a part of the encoder 4. Then, the sensor 7 detects the magnetic field fluctuation generated by the rotation of the encoder 4, converts it into an electrical signal proportional to the rotational speed, and outputs it to an ABS or TCS control unit (not shown).
[0012]
The outer ring 1 is fixed by bolting a mounting portion 1a provided on the outer peripheral surface on one end side to a suspension device (not shown). On the other hand, the shaft member 2 includes a hub 8 having a flange 8a on the outer peripheral surface on the other end side, and an inner ring 9 attached to the outer periphery on one end side of the hub 8. The flange 8a of the hub 8 is illustrated by a hub bolt 10. Fixed to the omitted wheel. The outer ring 1 and the shaft member 2 are made of metal, and a plurality of balls 3 held by the retainer 11 are arranged one by one between the outer ring 1 and the hub 8 and between the outer ring 1 and the inner ring 9. ing. Further, a gap between the inner peripheral surface on the other end side of the outer ring 1 and the outer peripheral surface of the hub 8 is closed by a sealing device 12.
[0013]
The encoder 4 includes a cylindrical attachment portion 4a that is fitted to the outer periphery of one end portion of the inner ring 9, and an encoder body 4b that is attached to a flange portion at one end of the attachment portion 4a. The encoder body 4b is formed by annularly forming permanent magnets such as rubber magnets, sintered magnets, resin magnets, etc., and magnetized so that S and N poles appear alternately in the circumferential direction. The magnetic field is changed by rotating the direction. A gear-type pulsar ring may be used as the encoder body.
[0014]
The cover 5 is formed of a synthetic resin in a covered cylindrical shape, and its cylindrical portion 5a is press-fitted into the inner periphery of one end portion of the outer ring 1 and attached to the outer ring 1, and the cover portion 5b opens one end of the outer ring 1. Is blocking. A flange 13 that abuts one end surface of the outer ring 1 is formed in the cylindrical portion 5a, whereby the entire cover 5 is accurately positioned in the axial direction with respect to the outer ring 1, and position management of the sensor 7 attached to the cover 5 is performed. Can be done easily.
[0015]
Further, as shown in FIG. 2, a cylindrical sensor mounting portion 14 is provided on the lid portion 5 b of the cover 5, and the insertion portion 7 a of the sensor 7 is inserted into a sensor mounting hole 15 formed on the inner peripheral side thereof. It has come to be. On the other hand, the cover 5 is integrally molded with a cored bar 6 formed in a covered cylindrical shape from the inner peripheral surface of the cylinder part 5a to the inner side surface of the lid part 5b. The opening of the mounting hole 15 on the side facing the encoder 4 is closed.
[0016]
The metal core 6 is made of a nonmagnetic steel plate (in this example, SUS 430) having a thickness of about 0.3 mm, and has a lid portion 6a, so that the metal core 6 is made of a conventional cylindrical material. Also, the strength of the cover 5 can be increased. Moreover, since it is nonmagnetic, it does not affect the detection accuracy of the rotational speed. The material of the metal core is not limited to non-magnetic steel, but may be any material that does not have magnetism and has strength as a reinforcing material. Also, the thickness of the lid can be changed within a range that does not change the distance between the sensor insertion portion and the encoder body.
[0017]
The sensor 7 is made of a synthetic resin and is attached to the cover 5 by inserting the insertion portion 7 a into the sensor attachment hole 15 of the cover 5. The insertion portion 7a is opposed to a part of the encoder body 4b with a predetermined interval across the lid portion 6a of the cored bar 6, and in the vicinity of the surface facing the encoder body 4b, by the rotation of the encoder 4. A detection unit (not shown) for detecting the generated magnetic field fluctuation is incorporated. The detection unit is connected to one end of the output cable 16 in the sensor 7, converts the detected magnetic field fluctuation into an electric signal proportional to the rotation speed, and then outputs the electric signal via the cable 16. It has become.
[0018]
This bearing device has the above-described configuration, and the opening of the sensor mounting hole 15 of the cover 5 on the side facing the encoder 4 is closed with a lid portion 6a of a cored bar 6 formed of a nonmagnetic steel plate in a covered cylindrical shape. Therefore, as compared with the conventional apparatus, the sensor mounting hole does not penetrate the cover, and therefore, there are few foreign substance intrusion paths into the apparatus, and the sealing performance of the entire apparatus is excellent.
[0019]
The present invention is not limited to the automobile wheel described in the embodiment, and can be effectively applied to a bearing device with a built-in rotation speed sensor that is used in a place where there is a high possibility of entry of foreign matter.
[0020]
【The invention's effect】
As described above, according to the present invention, the cover reinforcing member of the rotation speed sensor built-in bearing device is formed of a nonmagnetic material in a covered cylindrical shape, and the cover portion closes the opening of the cover sensor mounting hole on the side facing the encoder. Thus, since the sensor mounting hole is prevented from penetrating the cover, it is possible to reduce the entry path of foreign matter into the apparatus and improve the sealing performance of the entire apparatus.
[0021]
Accordingly, it is possible to extend the life of the bearing device, to prevent a decrease in detection accuracy of the rotational speed over a long period of time, and to stabilize the system that performs control using the detected rotational speed.
[0022]
Further, since the number of sealing members such as O-rings can be reduced, the structure and assembly work of the apparatus can be simplified, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a bearing device with a built-in rotational speed sensor according to an embodiment. FIG. 2 is an enlarged sectional view of a main part of the bearing device of FIG. , B is an enlarged sectional view of the main part of a [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer ring 1a Attachment part 2 Shaft member 3 Ball 4 Encoder 4a Attachment part 4b Main body 5 Cover 5a Tube part 5b Cover part 6 Core metal 6a Cover part 7 Sensor 7a Insertion part 8 Hub 8a Flange 9 Inner ring 10 Hub bolt 11 Cage 12 Sealing device 13 Flange 14 Sensor mounting portion 15 Mounting hole 16 Cable

Claims (1)

固定部材に固定される金属製の外輪と、外輪の内周側に挿入された状態で回転する軸部材と、前記外輪と軸部材との間に転動自在に配された複数の転動体と、前記軸部材の一端部に固定されたエンコーダと、前記外輪の一端部に装着されて外輪の一端の開口を塞ぐ合成樹脂製のカバーと、このカバーと一体にモールドされたカバー補強材と、前記カバーのセンサ取付穴に前記エンコーダの一部と対向するように取り付けられ、エンコーダの回転による磁界変動を検出して回転速度に比例する信号を出力するセンサとを備えた回転速度センサ内蔵軸受装置において、前記カバーは、有蓋円筒状に形成されその筒部が前記外輪の一端部の内周に圧入されるものとし、前記カバー補強材を非磁性金属材料で有蓋円筒状に形成し、このカバー補強材を前記カバーの筒部内周面から蓋部内側面にかけてモールドして、カバー補強材の蓋部で前記センサ取付穴の前記エンコーダと対向する側の開口を塞いだことを特徴とする回転速度センサ内蔵軸受装置。A metal outer ring that is fixed to the fixing member, a shaft member that rotates while being inserted on the inner peripheral side of the outer ring, and a plurality of rolling elements that are rotatably disposed between the outer ring and the shaft member; An encoder fixed to one end of the shaft member, a cover made of synthetic resin that is attached to one end of the outer ring and closes the opening of one end of the outer ring, and a cover reinforcing member molded integrally with the cover, A rotation speed sensor built-in bearing device comprising: a sensor mounted in a sensor mounting hole of the cover so as to face a part of the encoder, and detecting a magnetic field variation due to rotation of the encoder and outputting a signal proportional to the rotation speed in the cover is intended to its cylindrical portion is formed in a lidded cylindrical shape is press-fitted into the inner circumference of one end of the outer ring, to form said cover stiffener lidded cylindrical with a non-magnetic metal material, the cover Reinforcement Serial and molded from the tubular portion inner peripheral surface of the cover toward the lid portion inner surface, covering reinforcement of the rotational speed sensor incorporated bearing assembly with the cover portion, characterized in that it closes the opening of the encoder and opposite sides of the sensor mounting hole .
JP2003154381A 2003-05-30 2003-05-30 Bearing device with built-in rotation speed sensor Expired - Fee Related JP4286063B2 (en)

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JP2011084265A (en) * 2009-09-17 2011-04-28 Ntn Corp Bearing device for wheel
JP2011117549A (en) * 2009-12-04 2011-06-16 Ntn Corp Bearing device for wheel, equipped with rotational-speed detection device
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WO2011034134A1 (en) * 2009-09-17 2011-03-24 Ntn株式会社 Bearing device for a wheel, equipped with a rotational-speed measurement device
JP2011084265A (en) * 2009-09-17 2011-04-28 Ntn Corp Bearing device for wheel
JP2011117549A (en) * 2009-12-04 2011-06-16 Ntn Corp Bearing device for wheel, equipped with rotational-speed detection device
WO2012067091A1 (en) 2010-11-16 2012-05-24 Ntn株式会社 Bearing device adapted for use in wheel and provided with rotational speed detection device

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