JP2005042817A - Sealing device with encoder - Google Patents

Sealing device with encoder Download PDF

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JP2005042817A
JP2005042817A JP2003277525A JP2003277525A JP2005042817A JP 2005042817 A JP2005042817 A JP 2005042817A JP 2003277525 A JP2003277525 A JP 2003277525A JP 2003277525 A JP2003277525 A JP 2003277525A JP 2005042817 A JP2005042817 A JP 2005042817A
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encoder
annular member
seal
magnetic
sealing device
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JP4300412B2 (en
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Naoto Kobayashi
直人 小林
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Nok 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
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • 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
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device 4 with a magnetic encoder 21 integrated therewith capable of preventing degradation and disturbance of the magnetic force caused by the effect of muddy water or the like entering between the magnetic encoder 21 and a magnetic sensor 6, consistently supplying the magnetic force, and preventing degradation of the lifetime of the sealing device by preventing damages attributable to deposition of muddy water or the like on the encoder 21 or the like. <P>SOLUTION: The sealing device 4 comprises a substantially U-shaped protective annular member 11 which is fitted to one of an inner member 1 and an outer member 2, an encoder member 12 with a cylindrical part 12a fitted to the protective annular member 11, a magnetic ring 13 which is retained between the inner side in the axial direction of the protective annular member 11 and the encoder member 12, a seal annular member 14, and a seal member 15 which is vulcanizing-adhered to the seal annular member 14 and has a seal lip in slidable contact with the protective annular member 11 and the encoder member 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、互いに相対回転する内方部材および外方部材との間に形成される環状空間を密封するシール装置の構造に関する。更に詳しくは、自動車のアンチロックブレーキシステムにおける前後の車輪の回転数を検出する回転検出装置を持ったシール装置に関するものである。本発明のシール装置は家電製品、産業機械、自転車等の分野でも用いられる。   The present invention relates to a structure of a sealing device that seals an annular space formed between an inner member and an outer member that rotate relative to each other. More particularly, the present invention relates to a sealing device having a rotation detecting device for detecting the number of rotations of front and rear wheels in an antilock brake system of an automobile. The sealing device of the present invention is also used in the fields of household appliances, industrial machines, bicycles and the like.

従来、図３に示すよう転動体１０３を介して互いに相対回転する内方部材１０１および外方部材１０２間の環状空間を密封するシール装置１０５において、シール装置１０５に磁気エンコーダ１０６を一体化されたものが開発されている。シール装置１０５は、各々断面Ｌ字状とされた第一、第二のシール環状部材１０７，１０８を内方部材１０１および外方部材１０２にそれぞれ嵌合させ、第二のシール環状部材１０８にシールリップ１０９を設けて、シールリップ１０９を第一のシール環状部材１０７に摺接させたものである。磁気エンコーダ１０６は、磁性体粉が混入されたゴムまたは樹脂等のゴム状弾性体製エンコーダ部材１１１で形成されており、第一のシール環状部材１０７の軸方向外側（図上右方向）に加硫接着している。エンコーダ部材１１１は、円周方向に交互に磁極が形成されており、近接配置された磁気センサ１１０で検出される。 Conventionally, in a sealing device 105 for sealing an annular space between an inner member 101 and an outer member 102 that rotate relative to each other via a rolling element 103 as shown in FIG. 3, a magnetic encoder 106 is integrated with the sealing device 105. Things are being developed. The sealing device 105 has first and second seal annular members 107 and 108 each having an L-shaped cross section fitted to the inner member 101 and the outer member 102, respectively, and seals the second seal annular member 108. A lip 109 is provided, and the seal lip 109 is in sliding contact with the first seal annular member 107. The magnetic encoder 106 is formed by a rubber-like elastic encoder member 111 made of rubber or resin mixed with magnetic powder, and is added to the axially outer side (right direction in the drawing) of the first seal annular member 107. Sulfur bonded . The encoder member 111 has magnetic poles alternately formed in the circumferential direction, and is detected by the magnetic sensor 110 arranged in proximity.

しかし、上記構成だと、磁気エンコーダ１０６および磁気センサ１１０が最も軸方向外側の大気に露出した位置に配置されているので、飛散する泥水、あるいは異物に直接曝される過酷な状況にあり、この泥水が浸入すれば錆の発生を招いて、回転数の検出能力を低下させる。また、異物が浸入して磁気エンコーダと磁気センサとの間に付着すれば、最悪の場合、磁気エンコーダまたは磁気センサが異物の回転噛み込みによって損傷を起こし回転検出数を誤らせるという虞があり、その対策として、特開平１１−３０３８７９号、および特開２００２‐３３３０３３号では、磁気エンコーダの軸方向外側に配置された保護板で磁気エンコーダを包み込んで、磁気エンコーダと一体化した保護板を内方部材に組付けることが提案されている。しかし、この構成においても、泥水や異物の浸入に対する排除が十分ではなく、また、磁気エンコーダと一体化された保護板が組付けられる際に磁気エンコーダが異常な圧縮や変形を受け、検出精度が劣るという不具合点があった。更に、保護板と磁気エンコーダとを嵌合した後に更に内方部材に嵌合するために嵌合力が弱くなり、しかも、保護板と第一シール環状部材の端部が転動体側に露出しているので、軸受部内のグリースが両リング間から侵入する虞があった。 However, with the above configuration, the magnetic encoder 106 and the magnetic sensor 110 are arranged at a position exposed to the outermost atmosphere in the axial direction, so that it is in a harsh situation that is directly exposed to scattered muddy water or foreign matter. If muddy water infiltrates, rust is generated and the rotational speed detection ability is reduced. In addition, if foreign matter enters and adheres between the magnetic encoder and the magnetic sensor, in the worst case, the magnetic encoder or the magnetic sensor may be damaged due to the rotational biting of the foreign matter, and the number of rotation detection may be erroneous. As a countermeasure, in JP-A-11-303879 and JP-A-2002-333033, a protective plate that is integrated with a magnetic encoder is wrapped with a protective plate arranged on the outer side in the axial direction of the magnetic encoder. It has been proposed to assemble. However, even in this configuration, it is not sufficient to eliminate the intrusion of muddy water and foreign matter, and when the protective plate integrated with the magnetic encoder is assembled, the magnetic encoder is subjected to abnormal compression and deformation, and the detection accuracy is high. There was a problem of being inferior. Furthermore, after the protective plate and the magnetic encoder are fitted, the fitting force is weakened because the protective plate and the magnetic encoder are fitted, and the end portions of the protective plate and the first seal annular member are exposed to the rolling element side. Therefore, there is a possibility that the grease in the bearing portion may enter from between both rings.

特開平１１−３０３８７９号公報Japanese Patent Laid-Open No. 11-303879 特開２００２−３３３０３３公報JP 2002-333033 A

本発明は以上の点に鑑みて、磁気エンコーダを一体化したシール装置において、磁気エンコーダと磁気センサとの間に侵入する泥水、異物、外部磁界等の影響を受けることによる磁力の低下や乱れを防止し、安定した磁力の供給を図ることを目的とする。併せて、泥水や異物が磁気エンコーダや磁気センサに付着することに起因する損傷を防止してシール装置の寿命の低下を防止することも目的とする。 In view of the above points, the present invention eliminates magnetic force reduction and disturbance caused by the influence of muddy water, foreign matter, external magnetic field, etc. entering between a magnetic encoder and a magnetic sensor in a sealing device integrated with a magnetic encoder. The purpose is to prevent and supply a stable magnetic force. In addition, another object of the present invention is to prevent damage caused by adhesion of muddy water and foreign matter to the magnetic encoder and the magnetic sensor, thereby preventing a reduction in the life of the sealing device.

上記目的を達成するため、本発明の請求項１にかかるシール装置は、
互いに相対回転する内方部材および外方部材との間に形成される環状空間を密封するシール装置であって、
上記シール装置は、上記内方部材および外方部材の内の一方の部材に略コの字状の一端が嵌合されている保護用環状部材と、上記保護用環状部材の略コの字状の他端に円筒部が嵌合されている第一エンコーダ部材と、上記保護用環状部材の軸方向内側であって上記第一エンコーダ部材との間に保持された第二エンコーダ部材と、上記保護用環状部材と対向して上記内方部材および外方部材の内の他方の部材に取り付けられているフランジ部を有するシール環状部材と、上記シール環状部材に加硫接着されていて上記保護用環状部材に摺接するシールリップと上記第一エンコーダ部材に摺接するシールリップとが形成されているシール部材とを有しており、
前記保護用環状部材の軸方向外側に磁気センサを近接配置せしめたことを特徴とするものである。 In order to achieve the above object, a sealing device according to claim 1 of the present invention comprises:
A sealing device for sealing an annular space formed between an inner member and an outer member that rotate relative to each other,
The sealing device includes a protective annular member in which one of the inner member and the outer member is fitted to one end of a substantially U-shape, and a substantially U-shape of the protective annular member. A first encoder member having a cylindrical portion fitted to the other end thereof, a second encoder member held between the first encoder member on the axially inner side of the protective annular member, and the protection A seal annular member having a flange portion attached to the other member of the inner member and the outer member facing the annular member, and the protective annular member vulcanized and bonded to the seal annular member A seal lip formed in sliding contact with the member and a seal lip formed in sliding contact with the first encoder member;
A magnetic sensor is arranged close to the outside of the protective annular member in the axial direction.

本発明は、以下の効果を奏する。   The present invention has the following effects.

すなわち、上記構成を備えた本発明のシール装置は、保護用環状部材が略コの字状に磁気エンコーダを覆っているので泥水や異物等の影響を受けることが無く、また、保護用環状部材と第一エンコーダ部材の各々の外周側端部を合わせることにより軸方向の相対位置を確定でき、第二エンコーダ部材に異常な圧縮や変形を与えることなく組みつけが可能となる。その結果、安定した磁力の供給が可能となり、回転速度等の検出精度を高めることができる。 That is, in the sealing device of the present invention having the above-described configuration, the protective annular member covers the magnetic encoder in a substantially U shape, so that it is not affected by muddy water or foreign matter, and the protective annular member When possible to determine the relative position in the axial direction by combining the outer peripheral end of each of the first encoder member, assembling it becomes possible without causing an abnormal compression or deformation to the second encoder member. As a result, a stable magnetic force can be supplied, and the detection accuracy such as the rotation speed can be improved.

また、第一エンコーダ部材が保護用環状部材と外周側一端で嵌合しており、端部が転動体側に露出しておらず、しかも内方部材には保護用環状部材だけを嵌合させているので内方部材と保護用環状部材との間の嵌合力を高めることができ、軸受部内のグリースの侵入を効果的に防止することができる。 Further, the first encoder member is fitted to the protective annular member at one end on the outer peripheral side, the end is not exposed to the rolling element side, and only the protective annular member is fitted to the inner member. Therefore, the fitting force between the inner member and the protective annular member can be increased, and the grease can be effectively prevented from entering the bearing portion.

また、第一エンコーダ部材と保護用環状部材の内周部にシールリップを摺動させることができるとともに、保護用環状部材とシール部材との間にラビリンスの設定が可能となるので、泥水や異物等の排除を飛躍的に向上することが出来る。更に、第一エンコーダ部材が保護用環状部材とだけ嵌合しているので、両部材間の嵌合力を高めることができ、これによっても泥水や異物等に対するシール性を向上することができる。したがって、泥水や異物の付着に起因する損傷を防止してシール装置の寿命の低下を防止することが出来る。 In addition, the seal lip can be slid on the inner periphery of the first encoder member and the protective annular member, and the labyrinth can be set between the protective annular member and the seal member, so that muddy water and foreign matter can be set. Etc. can be drastically improved. Furthermore, since the first encoder member is fitted only with the protective annular member, the fitting force between the two members can be increased, and the sealing performance against muddy water and foreign matters can also be improved. Therefore, it is possible to prevent damage due to adhesion of muddy water and foreign matter and prevent a reduction in the life of the sealing device.

更に、保護用環状部材とシール部材との間にラビリンス構造を設定することによって、第二エンコーダ部材を最大径に形成することが可能となるので、磁力の検出範囲を大きくでき、これによっても検出精度を高めることができる。 Furthermore, by setting a labyrinth structure between the protective annular member and the seal member, the second encoder member can be formed to the maximum diameter, so that the detection range of the magnetic force can be enlarged, and this is also detected. Accuracy can be increased.

つぎに本発明の実施例を図面にしたがって説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明に係るシール装置を設置した車輪支持装置の要部断面図であり、図２は、シール装置の部分断面図である。   FIG. 1 is a cross-sectional view of a main part of a wheel support device provided with a seal device according to the present invention, and FIG. 2 is a partial cross-sectional view of the seal device.

図１に示すように、このシール装置４，５は、転動体３を介して互いに相対回転する内方部材１および外方部材２により形成される環状空間を密封するように両端に取り付けられている。一端のシール装置は４は、回転数を計測する磁気エンコーダ付きのものである。内方部材１および外方部材２は、転動体３の軌道面１ａ，２ａを有しており、各軌道面１ａ，２ａは溝状に形成されている。内方部材１および外方部材２は、軸受内輪および軸受外輪の単独であっても、これら軸受内輪や軸受外輪と別の部品とが組み合わさった、組立部材であっても良い。また、内方部材１は、軸であっても良い。   As shown in FIG. 1, the sealing devices 4 and 5 are attached to both ends so as to seal the annular space formed by the inner member 1 and the outer member 2 that rotate relative to each other via the rolling elements 3. Yes. The sealing device 4 at one end is equipped with a magnetic encoder for measuring the number of rotations. The inner member 1 and the outer member 2 have raceway surfaces 1a and 2a of the rolling element 3, and each raceway surface 1a and 2a is formed in a groove shape. The inner member 1 and the outer member 2 may be a bearing inner ring and a bearing outer ring alone, or may be an assembly member in which these bearing inner ring and bearing outer ring are combined with another component. Further, the inner member 1 may be a shaft.

図２は、磁気エンコーダ２１付きのシール装置４を拡大したものである。このシール装置４は、内方部材１に一端が嵌合されている保護用環状部材１１と、保護用環状部材１１の他の一端に嵌合されている第一エンコーダ部材１２と、保護用環状部材１１の軸方向内側であって第一エンコーダ部材１２の軸方向外側に取り付けられている第二エンコーダ部材１３と、外方部材２に嵌合されているシール環状部材１４と、シール環状部材１４に一体成形されているシール部材１５を備えている。 FIG. 2 is an enlarged view of the sealing device 4 with the magnetic encoder 21 . The sealing device 4 includes a protective annular member 11 having one end fitted to the inner member 1, a first encoder member 12 fitted to the other end of the protective annular member 11, and a protective annular A second encoder member 13 attached to the axially inner side of the member 11 and an axially outer side of the first encoder member 12, a seal annular member 14 fitted to the outer member 2, and a seal annular member 14 Is provided with a seal member 15 formed integrally therewith.

保護用環状部材１１は、磁気エンコーダ２１を取り囲むように略コの字状に成形されており、略コの字状の内周側一端１１ａが内方部材１に嵌合されており、略コの字状の外周側他端１１ｃの内周面１１ｆには第一エンコーダ部材１２の円筒部１２ａが嵌合されている。保護用環状部材１１は、内包する磁気エンコーダ２１が発生する磁場を有効最大に磁気センサ６へ届かせるために、非磁性材の材料で成形されている。 The protective annular member 11 is formed in a substantially U shape so as to surround the magnetic encoder 21, and the substantially U-shaped inner peripheral side end 11 a is fitted to the inner member 1. The cylindrical portion 12a of the first encoder member 12 is fitted to the inner peripheral surface 11f of the U-shaped outer peripheral side other end 11c. The protective annular member 11 is formed of a non-magnetic material so that the magnetic field generated by the included magnetic encoder 21 can reach the magnetic sensor 6 to an effective maximum.

磁気エンコーダ２１は第一エンコーダ部材１２と第二エンコーダ部材１３により形成されている。第一エンコーダ部材１２は円筒部１２ａとフランジ部１２ｂとから形成されたＬ字状であって、磁性材の材料で成形されている。第二エンコーダ部材１３は、ゴム材にフェライト系磁粉、希土類磁粉、アルコニ磁粉等の磁性体を単独または混合して加えたものを加硫成形後に磁化したものであり、第一エンコーダ部材１２の軸方向外側のフランジ部１２ｂに加硫接着されており、保護用環状部材１１のフランジ部１１ｂの軸方向内側１１ｅに密接している。なお、第二エンコーダ部材１３は第一エンコーダ部材１２に加硫接着されていなくとも、保護用環状部材１１との間に保持されていれば良く、第二エンコーダ部材１３を予め加硫成形しておいても良い。その場合には、第二エンコーダ部材１３の外周部１３ａを保護用環状部材の外周側円筒部１１ｃの内周面１１ｆに嵌合し位置決めすると良い。 The magnetic encoder 21 is formed by the first encoder member 12 and the second encoder member 13. The first encoder member 12 has an L shape formed of a cylindrical portion 12a and a flange portion 12b, and is formed of a magnetic material. Second encoder member 13 is obtained by magnetizing the ferrite magnet powder in a rubber material, rare earth magnetic powder, those added alone or mixed magnetic material such as Arukoni magnetic particles after vulcanization, the first encoder member 12 axis The outer flange portion 12 b is vulcanized and bonded, and is in close contact with the axially inner side 11 e of the flange portion 11 b of the protective annular member 11. Incidentally, the second encoder member 13 need not bonded by vulcanization to the first encoder member 12, need only be held between the protective annular member 11, previously vulcanization molding the second encoder member 13 You can leave it. In that case, the outer peripheral portion 13a of the second encoder member 13 may be fitted and positioned on the inner peripheral surface 11f of the outer peripheral side cylindrical portion 11c of the protective annular member.

第一エンコーダ部材１２は、その外周円筒部１２ａの端部と保護用環状部材１１の外周側円筒部１１ｃの端部との軸方向を合わせることで、第一エンコーダ部材１２と保護用環状部材１１の軸方向相対位置を確定できるため、第二エンコーダ部材１３に異常な圧縮や変形を与えることなく組み立てることができる。 The first encoder member 12 is aligned with the axial direction of the end of the outer peripheral cylindrical portion 12a and the end of the outer peripheral cylindrical portion 11c of the protective annular member 11 so that the first encoder member 12 and the protective annular member 11 are aligned. Therefore, the second encoder member 13 can be assembled without causing any abnormal compression or deformation.

シール環状部材１４は、円筒部１４ａとフランジ部１４ｂとを有するＬ字形状であって、保護用環状部材１１と対向するように取り付けられており、円筒部１４ａの部分が外方部材２に嵌合されている。シール環状部材１４の内周部には、ゴム状弾性体で形成されているシール部材１５が加硫接着されている。   The seal annular member 14 has an L shape having a cylindrical portion 14 a and a flange portion 14 b and is attached so as to face the protective annular member 11, and a portion of the cylindrical portion 14 a is fitted to the outer member 2. Are combined. A seal member 15 formed of a rubber-like elastic body is vulcanized and bonded to the inner peripheral portion of the seal annular member 14.

シール部材１５は、第一エンコーダ部材１２の円筒部１２ａの内周面１２ｃに摺接するシールリップ１５ａと、第一エンコーダ部材１２のフランジ部１２ｂの軸方向内側１２ｄに摺接するシールリップ１５ｂと，保護用環状部材１１の一端１１ａの外周面１１ｄに摺接するシールリップ１５ｃ，１５ｄを一体として有している。 Sealing member 15 has a seal lip 15a in sliding contact with the inner circumferential surface 12c of the cylindrical portion 12a of the first encoder member 12, and a seal lip 15b in sliding contact with the axially inward 12d of the flange portion 12b of the first encoder member 12, the protection use the annular member 11 at one end 11a of the outer circumferential surface 11d in sliding contact with the seal lip 15c, and a 15d integrally.

また、保護用環状部材１１とシール部材１５との間隙３１、３２は、密封力の向上を目的に近接配備されているので、ラビリンスシール構造が形成されている。   Further, since the gaps 31 and 32 between the protective annular member 11 and the seal member 15 are arranged close to each other for the purpose of improving the sealing force, a labyrinth seal structure is formed.

なお、第二エンコーダ部材１３を形成している材質は、ゴム状弾性体以外のプラスチック等の合成樹脂であっても良い。 The material forming the second encoder member 13 may be a synthetic resin such as plastic other than the rubber-like elastic body.

また、保護用環状部材１１および第一エンコーダ部材１２に摺接するリップの形状、向き、および個数等は、シール性を考慮して使用条件により適宜選択するものとする。 Further, the shape, orientation, number, etc. of the lips that are in sliding contact with the protective annular member 11 and the first encoder member 12 are appropriately selected according to the use conditions in consideration of the sealing property.

この構成のシール装置によると、保護用環状部材１１が略コの字状に形成されているので、磁気エンコーダ２１が泥水や異物等の影響を受けることが無く、また、保護用環状部材１１と第一エンコーダ部材１２との各々の外周側端部を合わせることにより両部材の軸方向相対位置を確定でき、第二エンコーダ部材１３に異常な圧縮や変形を与えることなく組みつけが可能となる。その結果、安定した磁力の供給が可能となり、回転速度等の検出精度を高めることができる。 According to the sealing device of this configuration, since the protective annular member 11 is formed in a substantially U-shape, the magnetic encoder 21 is not affected by muddy water or foreign matter, and the protective annular member 11 By aligning the outer peripheral side ends of the first encoder member 12 with each other, the axial relative positions of the two members can be determined, and the second encoder member 13 can be assembled without causing abnormal compression or deformation. As a result, a stable magnetic force can be supplied, and the detection accuracy such as the rotation speed can be improved.

また、保護用環状部材１１が略コの字形状であって、保護用環状部材１１とシール部材１５との間にラビリンス構造３１，３２を設定することができ、しかも、シールリップを第一エンコーダ部材１２の内周部１２ｃ，１２ｄと保護用環状部材１１の外周面１１ｄに摺接させることによって、前記ラビリンシール構造３１，３２によっても侵入してきた泥水や異物等の更なる侵入を、最小限に抑えることが可能となり、これによっても泥水や異物等の排除を飛躍的に向上することができる。 The protective annular member 11 is substantially U-shaped, and the labyrinth structures 31, 32 can be set between the protective annular member 11 and the seal member 15, and the seal lip is used as the first encoder. the inner peripheral portion 12c of the member 12, by sliding contact 12d and the outer circumferential surface 11d of the protective annular member 11, a further entry of muddy water and foreign matter invading by the labyrinth seal structure 31, the minimum As a result, the removal of muddy water and foreign matters can be dramatically improved.

更に、第一エンコーダ部材１２が保護用環状部材１１の外周側円筒部１１ｃの内周に嵌合しているので、両部材１１，１２の端部が転動体３側に露出することがなく、しかも、内方部材１には保護用環状部材１１だけを組付けるので、保護用環状部材１１と第一エンコーダ部材１２を嵌合したものを内方部材１に嵌合する場合と比較して、嵌合力を高めることができるので密接度が上がり、軸受部内のグリースが侵入することに対して十分なシール性を得ることができる。同様に、第一エンコーダ部材１２が、保護用環状部材１１の外周側円筒部１１ｃとだけ嵌合しているので嵌合力を高めることができ、両部材１１，１２間においても泥水や異物に対して十分なシール性を得ることができる。 Further, since the first encoder member 12 is fitted to the inner periphery of the outer peripheral side cylindrical portion 11c of the protective annular member 11, the end portions of both the members 11 and 12 are not exposed to the rolling element 3 side, In addition, since only the protective annular member 11 is assembled to the inner member 1, compared with the case where the protective annular member 11 and the first encoder member 12 are fitted to the inner member 1, Since the fitting force can be increased, the closeness is increased, and sufficient sealing performance can be obtained against the penetration of grease in the bearing portion. Similarly, since the first encoder member 12 is fitted only to the outer peripheral side cylindrical portion 11c of the protective annular member 11, the fitting force can be increased, and between the members 11 and 12 against muddy water and foreign matter. And sufficient sealing performance can be obtained.

更に、保護用環状部材１１とシール部材１５との間にラビリンス構造３１，３２を設定することによって、第二エンコーダ部材１３を最大径に形成することが可能となるので、磁力の検出範囲を大きくでき検出精度を高めることができる。 Further, by setting the labyrinth structures 31 and 32 between the protective annular member 11 and the seal member 15, the second encoder member 13 can be formed to the maximum diameter, so that the detection range of the magnetic force is increased. And detection accuracy can be increased.

本発明の実施例に係るシール装置を設置した車輪支持装置の要部断面図Sectional drawing of the principal part of the wheel support apparatus which installed the sealing device based on the Example of this invention. 図１におけるシール装置の部分断面図Partial sectional view of the sealing device in FIG. 従来例におけるシール装置の部分断面図Partial sectional view of a sealing device in a conventional example

符号の説明Explanation of symbols

１ 内方部材
２ 外方部材
３ 転動体
４，５ シール装置
６ 磁気センサ
１１ 保護用環状部材
１２ 第一エンコーダ部材
１３ 第二エンコーダ部材
１４ シール環状部材
１５ シール部材
２１ 磁気エンコーダ
３１，３２ ラビリンス隙間 DESCRIPTION OF SYMBOLS 1 Inner member 2 Outer member 3 Rolling body 4,5 Sealing device 6 Magnetic sensor 11 Protective annular member 12 First encoder member 13 Second encoder member 14 Seal annular member 15 Seal member 21 Magnetic encoder 31, 32 Labyrinth gap

Claims (1)

互いに相対回転する内方部材および外方部材との間に形成される環状空間を密封するシール装置であって、
上記シール装置は、上記内方部材および外方部材の内の一方の部材に略コの字状の一端が嵌合されている保護用環状部材と、上記保護用環状部材の略コの字状の他端に円筒部が嵌合されているエンコーダ部材と、上記保護用環状部材の軸方向内側であって上記エンコーダ部材との間に保持された磁性環と、上記保護用環状部材と対向して上記内方部材および外方部材の内の他方の部材に取り付けられているフランジ部を有するシール環状部材と、上記シール環状部材に加硫接着されていて上記保護用環状部材に摺接するシールリップと上記エンコーダ部材に摺接するシールリップとが形成されているシール部材とを有しており、
前記保護用環状部材の軸方向外側に磁気センサを近接配置せしめたことを特徴とするシール装置。 A sealing device for sealing an annular space formed between an inner member and an outer member that rotate relative to each other,
The sealing device includes a protective annular member in which one of the inner member and the outer member is fitted to one end of a substantially U-shape, and a substantially U-shape of the protective annular member. An encoder member having a cylindrical portion fitted to the other end thereof, a magnetic ring axially inside the protective annular member and held between the encoder member, and the protective annular member. A seal annular member having a flange portion attached to the other member of the inner member and the outer member, and a seal lip that is vulcanized and bonded to the seal annular member and is in sliding contact with the protective annular member And a seal member formed with a seal lip that is in sliding contact with the encoder member,
A sealing device, wherein a magnetic sensor is arranged close to the outside of the protective annular member in the axial direction.
JP2003277525A 2003-07-22 2003-07-22 Sealing device with encoder Expired - Fee Related JP4300412B2 (en)

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JP2007292092A (en) * 2006-04-21 2007-11-08 Nsk Ltd Seal ring with encoder and rolling bearing unit with encoder
EP2003425A1 (en) * 2006-03-31 2008-12-17 NOK Corporation Pulser ring for rotary encoder
JP2010031961A (en) * 2008-07-29 2010-02-12 Jtekt Corp Rolling bearing device with sensor
JP2012117674A (en) * 2011-12-13 2012-06-21 Nsk Ltd Combined seal ring with encoder
DE102016125093A1 (en) * 2016-12-21 2018-06-21 Schaeffler Technologies AG & Co. KG Sealing system without pressure exchange

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ITUB20160770A1 (en) * 2015-02-17 2017-08-16 Skf Ab Seal assembly for rolling bearings, in particular for vehicle wheel hub units and associated wheel hub units.

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JPH0635661U (en) * 1992-10-16 1994-05-13 光洋精工株式会社 Rolling bearing sealing device
JPH11303879A (en) * 1998-04-23 1999-11-02 Uchiyama Mfg Corp Bearing seal
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2003425A1 (en) * 2006-03-31 2008-12-17 NOK Corporation Pulser ring for rotary encoder
US7960967B2 (en) * 2006-03-31 2011-06-14 Nok Corporation Sealing ring with a pulsar ring for a rotary encoder
EP2003425A4 (en) * 2006-03-31 2013-12-11 Nok Corp Pulser ring for rotary encoder
JP2007292092A (en) * 2006-04-21 2007-11-08 Nsk Ltd Seal ring with encoder and rolling bearing unit with encoder
JP2010031961A (en) * 2008-07-29 2010-02-12 Jtekt Corp Rolling bearing device with sensor
JP2012117674A (en) * 2011-12-13 2012-06-21 Nsk Ltd Combined seal ring with encoder
DE102016125093A1 (en) * 2016-12-21 2018-06-21 Schaeffler Technologies AG & Co. KG Sealing system without pressure exchange

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