JP5459012B2 - Sealing device, rolling bearing provided with sealing device, and hub unit bearing - Google Patents

Sealing device, rolling bearing provided with sealing device, and hub unit bearing Download PDF

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JP5459012B2
JP5459012B2 JP2010075080A JP2010075080A JP5459012B2 JP 5459012 B2 JP5459012 B2 JP 5459012B2 JP 2010075080 A JP2010075080 A JP 2010075080A JP 2010075080 A JP2010075080 A JP 2010075080A JP 5459012 B2 JP5459012 B2 JP 5459012B2
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sealing device
sliding contact
encoder
elastic seal
seal portion
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JP2011208683A (en
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貴之 宮川
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NSK Ltd
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NSK Ltd
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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
    • F16C33/7883—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 mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
    • 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
    • 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
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • 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

Description

本発明は、密封装置、密封装置を備える転がり軸受、及び密封装置を備えるハブユニット軸受に関する。   The present invention relates to a sealing device, a rolling bearing including the sealing device, and a hub unit bearing including the sealing device.

従来の密封装置として、一方の部材に嵌合固定される芯金、及びシールリップを有し芯金に固着される弾性体からなるシール部材と、シール部材に対向して他方の部材に嵌合固定されるスリンガと、を備えるものが知られている（例えば、特許文献１参照）。この特許文献１に記載の密封装置のスリンガは、内径側円筒部と外径側円筒部とが壁部で連続する断面略Ｕ字形状に形成されており、スリンガの内径側円筒部及び内側面にシール部材のシールリップが摺接する。また、スリンガの外径側円筒部に対応して半径方向外方に配置される弾性体には、ダストシール部が設けられており、外径側円筒部の外周面とダストシール部との間にラビリンスシール構造が形成される。   As a conventional sealing device, a metal core fitted and fixed to one member, a seal member made of an elastic body having a seal lip and fixed to the metal core, and fitted to the other member facing the seal member What is provided with the slinger fixed is known (for example, refer to patent documents 1). The slinger of the sealing device described in Patent Document 1 is formed in a substantially U-shaped cross section in which an inner diameter side cylindrical portion and an outer diameter side cylindrical portion are continuous at a wall portion, and the inner diameter side cylindrical portion and the inner side surface of the slinger The seal lip of the seal member is slidably contacted. In addition, a dust seal portion is provided on the elastic body disposed radially outward corresponding to the outer diameter side cylindrical portion of the slinger, and a labyrinth is provided between the outer peripheral surface of the outer diameter side cylindrical portion and the dust seal portion. A seal structure is formed.

実開平７−１０６３０号公報Japanese Utility Model Publication No. 7-10630

しかしながら、上記特許文献１に記載の密封装置では、ダストシール部に近接配置されるスリンガが金属製であるため、ラビリンスシール効果を高めるべく両者間の隙間を狭めてダストシール部とスリンガとが接触すると、硬度が低いゴム製のダストシール部が極度に摩耗して、ラビリンス隙間を維持できなくなる可能性があった。   However, in the sealing device described in Patent Document 1, since the slinger disposed close to the dust seal portion is made of metal, when the dust seal portion and the slinger come into contact with each other by narrowing the gap between the two to enhance the labyrinth seal effect, There was a possibility that the rubber dust seal part having low hardness would be extremely worn and the labyrinth gap could not be maintained.

本発明は、前述した課題に鑑みてなされたものであり、その目的は、ラビリンスシールを構成する部材同士が接触しても、適切なラビリンス隙間を維持することができ、また、回転トルクを低減することができる密封装置、密封装置を備える転がり軸受及びハブユニット軸受を提供することにある。   The present invention has been made in view of the above-described problems. The object of the present invention is to maintain an appropriate labyrinth gap even when members constituting the labyrinth seal come into contact with each other, and to reduce rotational torque. Another object of the present invention is to provide a sealing device, a rolling bearing and a hub unit bearing provided with the sealing device.

本発明の上記目的は、下記の構成により達成される。
（１）同心上に配置されて相対回転可能に組み付けられる回転部材、及び静止部材間をシールする密封装置であって、回転部材及び静止部材の一方に固定され、第１円筒部及び第１円環部からなる断面略Ｌ字形状の芯金と、芯金に固着され、少なくとも１つのシールリップを有する弾性シール部と、回転部材及び静止部材の他方に固定され、第２円筒部及び第２円環部からなる断面略Ｌ字形状のスリンガと、スリンガに固着されるエンコーダと、を備え、弾性シール部及びエンコーダの径方向に対向する部分に、互いに摺接する摺接部がそれぞれ形成され、エンコーダの摺接部の硬度が、弾性シール部の摺接部の硬度より高く設定されることを特徴とする密封装置。
（２）エンコーダは樹脂を含む材料で形成され、弾性シール部はゴムで形成されることを特徴とする（１）に記載の密封装置。
（３）密封装置は、車両の車軸を回転自在に支持するハブユニット軸受の外輪部材と内輪部材間に配設される密封装置であることを特徴とする（１）又は（２）に記載の密封装置。
（４）（１）又は（２）に記載の密封装置を備えることを特徴とする転がり軸受。
（５）（３）に記載の密封装置を備えることを特徴とするハブユニット軸受。 The above object of the present invention can be achieved by the following constitution.
(1) A rotating member that is arranged concentrically and is assembled so as to be relatively rotatable, and a sealing device that seals between the stationary member, and is fixed to one of the rotating member and the stationary member, and includes a first cylindrical portion and a first circle. A metal core having a substantially L-shaped cross section composed of an annular part, an elastic seal part fixed to the metal core and having at least one seal lip, and fixed to the other of the rotating member and the stationary member, the second cylindrical part and the second cylindrical part A slinger having a substantially L-shaped cross section formed of an annular portion and an encoder fixed to the slinger, and a sliding contact portion that is slidably contacted with each other is formed in a portion facing the radial direction of the elastic seal portion and the encoder, A sealing device characterized in that the hardness of the sliding contact portion of the encoder is set higher than the hardness of the sliding contact portion of the elastic seal portion.
(2) The sealing device according to (1), wherein the encoder is made of a material containing resin, and the elastic seal portion is made of rubber.
(3) The sealing device according to (1) or (2), wherein the sealing device is a sealing device disposed between an outer ring member and an inner ring member of a hub unit bearing that rotatably supports an axle of a vehicle. Sealing device.
(4) A rolling bearing comprising the sealing device according to (1) or (2).
(5) A hub unit bearing comprising the sealing device according to (3).

本発明によれば、回転部材及び静止部材の一方に固定され、第１円筒部及び第１円環部からなる断面略Ｌ字形状の芯金と、芯金に固着され、少なくとも１つのシールリップを有する弾性シール部と、回転部材及び静止部材の他方に固定され、第２円筒部及び第２円環部からなる断面略Ｌ字形状のスリンガと、スリンガに固着されるエンコーダと、を備え、弾性シール部及びエンコーダの径方向に対向する部分に、互いに摺接する摺接部がそれぞれ形成され、エンコーダの摺接部の硬度が、弾性シール部の摺接部の硬度より高く設定されるため、エンコーダの摺接部と弾性シール部の摺接部が接触しても、硬度の低い弾性シール部の摺接部が適度に摩耗して、最小且つ適切なラビリンス隙間を形成することができる。また、エンコーダの摺接部と弾性シール部の摺接部との摺接が、有機材同士の摺接であるので、摺接部の過度な摩耗を防止して、回転トルクを低減することができる。   According to the present invention, a core bar having a substantially L-shaped cross section, which is fixed to one of a rotating member and a stationary member, and includes a first cylindrical portion and a first annular portion, and at least one seal lip fixed to the core bar. An elastic seal portion having a slinger having a substantially L-shaped cross section, which is fixed to the other of the rotating member and the stationary member and includes a second cylindrical portion and a second annular portion, and an encoder fixed to the slinger. Since the elastic contact portion and the portion facing the radial direction of the encoder are each formed with a sliding contact portion that is in sliding contact with each other, the hardness of the sliding contact portion of the encoder is set higher than the hardness of the sliding contact portion of the elastic seal portion, Even if the slidable contact portion of the encoder and the slidable contact portion of the elastic seal portion come into contact with each other, the slidable contact portion of the low-hardness elastic seal portion can be appropriately worn to form a minimum and appropriate labyrinth gap. In addition, since the sliding contact between the sliding contact portion of the encoder and the sliding contact portion of the elastic seal portion is a sliding contact between organic materials, excessive wear of the sliding contact portion can be prevented and rotational torque can be reduced. it can.

本発明に係る密封装置の第１実施形態が適用されたハブユニット軸受の断面図である。It is sectional drawing of the hub unit bearing to which 1st Embodiment of the sealing device which concerns on this invention was applied. 図１に示す密封装置の周辺の拡大断面図である。It is an expanded sectional view of the periphery of the sealing device shown in FIG. 本発明に係る密封装置の第２実施形態の拡大断面図である。It is an expanded sectional view of 2nd Embodiment of the sealing device which concerns on this invention. （ａ）は弾性シール部の摺接部の形状を示す断面図、（ｂ）はエンコーダの摺接部の形状を示す側面図である。(A) is sectional drawing which shows the shape of the sliding contact part of an elastic seal part, (b) is a side view which shows the shape of the sliding contact part of an encoder. 第２実施形態の密封装置の変形例を示す図であり、（ａ）は弾性シール部の摺接部の形状を示す断面図、（ｂ）はエンコーダの摺接部の形状を示す側面図である。It is a figure which shows the modification of the sealing device of 2nd Embodiment, (a) is sectional drawing which shows the shape of the sliding contact part of an elastic seal part, (b) is a side view which shows the shape of the sliding contact part of an encoder. is there. 本発明に係る密封装置の第３実施形態の拡大断面図である。It is an expanded sectional view of 3rd Embodiment of the sealing device which concerns on this invention. 本発明に係る密封装置の第３実施形態の変形例の拡大断面図である。It is an expanded sectional view of the modification of 3rd Embodiment of the sealing device which concerns on this invention. 本発明に係る密封装置の第４実施形態の拡大断面図である。It is an expanded sectional view of 4th Embodiment of the sealing device which concerns on this invention. 本発明に係る密封装置の第５実施形態の拡大断面図である。It is an expanded sectional view of 5th Embodiment of the sealing device which concerns on this invention. 本発明に係る密封装置の第６実施形態の拡大断面図である。It is an expanded sectional view of 6th Embodiment of the sealing device which concerns on this invention.

以下、本発明に係る密封装置の各実施形態について、図面に基づいて詳細に説明する。なお、各実施形態は、本発明の密封装置をハブユニット軸受に適用する場合を例に説明するが、これに限定されず、本発明の密封装置は転がり軸受に適用されてもよい。   Hereinafter, each embodiment of the sealing device according to the present invention will be described in detail with reference to the drawings. In addition, although each embodiment demonstrates the case where the sealing device of this invention is applied to a hub unit bearing as an example, it is not limited to this, The sealing device of this invention may be applied to a rolling bearing.

（第１実施形態）
まず、図１及び図２を参照して、本発明に係る密封装置の第１実施形態について説明する。 (First embodiment)
First, with reference to FIG.1 and FIG.2, 1st Embodiment of the sealing device which concerns on this invention is described.

本実施形態のハブユニット軸受１０は、駆動輪用のハブユニット軸受であり、図１に示すように、外輪部材１１と、内輪部材であるハブ輪１２と、別体として形成されハブ輪１２に一体的に固定された内輪１３と、複数の転動体である玉１４と、密封装置１５，１６と、回転検出センサユニット１７と、側面カバー１８と、を備える。   The hub unit bearing 10 of this embodiment is a hub unit bearing for driving wheels. As shown in FIG. 1, an outer ring member 11, a hub ring 12 that is an inner ring member, and a hub ring 12 that are formed as separate bodies. An inner ring 13 that is integrally fixed, balls 14 that are a plurality of rolling elements, sealing devices 15 and 16, a rotation detection sensor unit 17, and a side cover 18 are provided.

外輪部材１１は、不図示の車体に固定されるナックル２６の保持孔２６ａに内嵌し、外輪部材１１の外周面に設けられる懸架用フランジ１１ｆがナックル２６にボルト２６ｂで締結されることにより、ナックル２６に結合固定される。   The outer ring member 11 is fitted into a holding hole 26a of a knuckle 26 fixed to a vehicle body (not shown), and a suspension flange 11f provided on the outer peripheral surface of the outer ring member 11 is fastened to the knuckle 26 with a bolt 26b. It is fixedly coupled to the knuckle 26.

ハブ輪１２は、略円柱形状の部材であり、そのアウトボード側端部（図中左側）に外周面から半径方向外方に展開されたフランジ部１２ｂが形成されている。フランジ部１２ｂには、不図示のホイール及びブレーキロータ等を締結するためのハブボルト１９が周方向に略等間隔で複数植設される。また、ハブ輪１２の内周面には、不図示の等速ジョイントのスプライン軸とスプライン結合するスプライン溝１２ｅが形成されている。   The hub wheel 12 is a substantially columnar member, and a flange portion 12b is formed on the outboard side end portion (left side in the drawing) that extends radially outward from the outer peripheral surface. A plurality of hub bolts 19 for fastening a wheel, a brake rotor, and the like (not shown) are implanted in the flange portion 12b at substantially equal intervals in the circumferential direction. A spline groove 12e is formed on the inner peripheral surface of the hub wheel 12 to be splined with a spline shaft of a constant velocity joint (not shown).

ハブ輪１２のインボード側端部（図中右側）には、小径段部１２ｄが形成されており、内輪１３を小径段部１２ｄに外嵌した後、小径段部１２ｄの端部をカシメ加工することにより、内輪１３がハブ輪１２に結合固定される。また、カシメ加工によって内輪１３を押圧することで、適正な与圧が付与されている。   A small-diameter step portion 12d is formed on the inboard side end portion (right side in the figure) of the hub wheel 12, and after the inner ring 13 is fitted on the small-diameter step portion 12d, the end portion of the small-diameter step portion 12d is crimped. By doing so, the inner ring 13 is coupled and fixed to the hub ring 12. Further, an appropriate pressure is applied by pressing the inner ring 13 by caulking.

外輪部材１１の内周面には、互いに平行な２列の外輪軌道面１１ａ，１１ａが離間して形成され、また、ハブ輪１２及び内輪１３の外周面には、それぞれ内輪軌道面１２ａ，１３ａが、外輪部材１１の各外輪軌道面１１ａに対応して形成されている。内輪軌道面１２ａ，１３ａ及び外輪軌道面１１ａ，１１ａで構成される軌道には、保持器２０によって転動自在に保持された複数の玉１４が円周方向に等間隔に配設されている。   Two rows of outer ring raceway surfaces 11a and 11a that are parallel to each other are formed on the inner circumferential surface of the outer ring member 11 apart from each other, and the inner ring raceway surfaces 12a and 13a are formed on the outer circumferential surfaces of the hub ring 12 and the inner ring 13, respectively. Is formed corresponding to each outer ring raceway surface 11 a of the outer ring member 11. A plurality of balls 14, which are rotatably held by a cage 20, are arranged at equal intervals in the circumferential direction on the track constituted by the inner ring raceway surfaces 12 a and 13 a and the outer ring raceway surfaces 11 a and 11 a.

複数の玉１４は、互いに所定の角度をなして外輪軌道面１１ａ，１１ａ及び内輪軌道面１２ａ，１３ａに接触して、背面組み合わせ型（ＤＢ）軸受が構成される。これによって、ハブ輪１２は、外輪部材１１に対して軸芯ＣＬを中心として回転可能となる。   The plurality of balls 14 are in contact with the outer ring raceway surfaces 11a and 11a and the inner ring raceway surfaces 12a and 13a at a predetermined angle to form a back-side combination (DB) bearing. As a result, the hub wheel 12 can rotate about the axis CL with respect to the outer ring member 11.

また、外輪部材１１のアウトボード側端部とハブ輪１２との間には、密封装置１５が設けられ、外輪部材１１のインボード側端部と内輪１３との間には、密封装置１６が設けられる。これにより、ハブユニット軸受１０の軸受空間２５の軸方向両端部がシールされて、封入したグリースが外部に漏洩することを防止すると共に、外部に存在する雨水、泥、塵等の各種異物が軸受空間２５内へ浸入することが防止される。   Further, a sealing device 15 is provided between the end portion on the outboard side of the outer ring member 11 and the hub wheel 12, and a sealing device 16 is provided between the end portion on the inboard side of the outer ring member 11 and the inner ring 13. Provided. As a result, both end portions in the axial direction of the bearing space 25 of the hub unit bearing 10 are sealed to prevent the enclosed grease from leaking to the outside, and various foreign matters such as rainwater, mud, dust, etc. existing outside the bearing. Intrusion into the space 25 is prevented.

密封装置１６は、図２に示すように、外輪部材１１のインボード側端部の内周面１１ｃに圧入固定される芯金２３と、芯金２３に固着され、３個のシールリップ２４ａを有する弾性シール部２４と、内輪１３のインボード側端部の外周面１３ｂに圧入固定されるスリンガ３０と、を備える。   As shown in FIG. 2, the sealing device 16 includes a core metal 23 that is press-fitted and fixed to the inner peripheral surface 11 c of the end portion on the inboard side of the outer ring member 11, and is fixed to the core metal 23 and includes three seal lips 24 a. And a slinger 30 that is press-fitted and fixed to the outer peripheral surface 13 b of the inboard side end of the inner ring 13.

回転検出センサユニット１７は、スリンガ３０の側面に固着されるエンコーダ３１と、エンコーダ３１の被検出面３１ａに検出部３２ａが対向配置されるセンサ３２とから構成されている。そして、ハブ輪１２及び内輪１３と共にエンコーダ３１が回転すると、センサ３２の出力が、回転速度に比例した周波数で変化して、不図示の車輪の回転速度が検出される。   The rotation detection sensor unit 17 includes an encoder 31 fixed to the side surface of the slinger 30 and a sensor 32 in which a detection unit 32a is disposed opposite to the detection surface 31a of the encoder 31. When the encoder 31 rotates together with the hub wheel 12 and the inner ring 13, the output of the sensor 32 changes at a frequency proportional to the rotation speed, and the rotation speed of a wheel (not shown) is detected.

側面カバー１８は、ステンレス鋼板、亜鉛メッキ鋼板等の耐食性を有する金属板にプレス加工が施されて形成されており、外輪部材１１のインボード側端部に外嵌固定される。また、側面カバー１８の上端部には、センサ３２の検出部３２ａを挿通させるセンサ孔１８ａが形成されている。   The side cover 18 is formed by pressing a corrosion-resistant metal plate such as a stainless steel plate or a galvanized steel plate, and is fitted and fixed to the end portion on the inboard side of the outer ring member 11. A sensor hole 18 a through which the detection unit 32 a of the sensor 32 is inserted is formed at the upper end of the side cover 18.

芯金２３は、第１円筒部４０及び第１円環部４１からなる断面略Ｌ字形状の円環状部材であり、第１円筒部４０が外輪部材１１のインボード側端部の内周面１１ｃに圧入されることにより、外輪部材１１に固定される。   The core metal 23 is an annular member having a substantially L-shaped cross section including a first cylindrical portion 40 and a first annular portion 41, and the first cylindrical portion 40 is an inner peripheral surface of an end portion on the inboard side of the outer ring member 11. It is fixed to the outer ring member 11 by being press-fitted into 11c.

弾性シール部２４は、ゴムなどの弾性部材によって成形され、芯金２３の内周面及び側面に沿って断面略Ｌ字形状に成形され、接着剤などによって芯金２３に固着される。弾性シール部２４の小径部側２４ｂには、３個のシールリップ２４ａが形成されている。また、弾性シール部２４の大径部側２４ｃの内周面には、１個の摺接部２４ｄが径方向内側に向かって突出形成されている。   The elastic seal portion 24 is formed of an elastic member such as rubber, is formed into a substantially L-shaped cross section along the inner peripheral surface and the side surface of the core metal 23, and is fixed to the core metal 23 with an adhesive or the like. Three seal lips 24 a are formed on the small-diameter portion side 24 b of the elastic seal portion 24. Further, one sliding contact portion 24d is formed to protrude radially inward on the inner peripheral surface of the elastic seal portion 24 on the large diameter portion side 24c.

スリンガ３０は、第２円筒部４３及び第２円環部４４からなる断面略Ｌ字形状の円環状部材であり、第２円筒部４３が内輪１３のインボード側端部の外周面１３ｂに圧入されることにより、内輪１３に固定される。   The slinger 30 is an annular member having a substantially L-shaped cross section composed of a second cylindrical portion 43 and a second annular portion 44, and the second cylindrical portion 43 is press-fitted into the outer peripheral surface 13 b of the inboard side end portion of the inner ring 13. As a result, the inner ring 13 is fixed.

エンコーダ３１は、フェライト、希土類元素等の強磁性材を合成樹脂中に混入したプラスチック磁石が、円輪状に形成されたものであり、スリンガ３０の第２円環部４４の側面４４ａ及び外径端部４４ｂを覆って接着剤などにより固着されている。また、エンコーダ３１は、着磁されており、その着磁方向は、円周方向に関して交互に等間隔で変化している。   The encoder 31 is formed of a plastic magnet in which a ferromagnetic material such as ferrite or rare earth element is mixed in a synthetic resin in a ring shape, and includes a side surface 44a and an outer diameter end of the second annular portion 44 of the slinger 30. The portion 44b is covered and fixed by an adhesive or the like. The encoder 31 is magnetized, and the magnetizing direction alternately changes at equal intervals in the circumferential direction.

また、芯金２３及びスリンガ３０は、その第１円環部４１と第２円環部４４とが軸方向に対向するように配置される。これにより、弾性シール部２４の３個のシールリップ２４ａがスリンガ３０に摺接すると共に、弾性シール部２４の１個の摺接部２４ｄがエンコーダ３１の外周面である摺接面３１ｂに摺接して、外輪部材１１と内輪１３との間をシールする。   Further, the cored bar 23 and the slinger 30 are arranged such that the first annular part 41 and the second annular part 44 face each other in the axial direction. Accordingly, the three seal lips 24 a of the elastic seal portion 24 are in sliding contact with the slinger 30, and one sliding contact portion 24 d of the elastic seal portion 24 is in sliding contact with the sliding contact surface 31 b that is the outer peripheral surface of the encoder 31. The space between the outer ring member 11 and the inner ring 13 is sealed.

そして、本実施形態では、プラスチック磁石からなるエンコーダ３１の摺接面３１ｂの硬度は、ゴムからなる弾性シール部２４の摺接部２４ｄの硬度より高く設定されている。また、摺接部２４ｄと摺接面３１ｂとの接触圧は、シールリップ２４ａとスリンガ３０との接触圧よりも小さく（軽接触）設定されている。   In this embodiment, the hardness of the sliding contact surface 31b of the encoder 31 made of a plastic magnet is set higher than the hardness of the sliding contact portion 24d of the elastic seal portion 24 made of rubber. The contact pressure between the sliding contact portion 24d and the sliding contact surface 31b is set to be smaller (light contact) than the contact pressure between the seal lip 24a and the slinger 30.

このように構成された密封装置１６では、初期状態において、弾性シール部２４の摺接部２４ｄとエンコーダ３１の摺接面３１ｂとが軽い接触状態となっているので、使用初期において、エンコーダ３１の回転に伴って硬度が低い弾性シール部２４の摺接部２４ｄが適度に摩耗し、最小且つ最適なラビリンス隙間が形成される。また、摺接部２４ｄと摺接面３１ｂとの摺接が、ゴムと樹脂との有機材同士の摺接であるため、金属部材との接触とは異なり、摺接部２４ｄの過度な摩耗が防止されて、回転トルクが低減される。   In the sealing device 16 configured as described above, in the initial state, the sliding contact portion 24d of the elastic seal portion 24 and the sliding contact surface 31b of the encoder 31 are in a light contact state. Along with the rotation, the sliding contact portion 24d of the elastic seal portion 24 having a low hardness is moderately worn, and a minimum and optimum labyrinth gap is formed. Further, since the sliding contact between the sliding contact portion 24d and the sliding contact surface 31b is a sliding contact between organic materials of rubber and resin, unlike the contact with the metal member, excessive wear of the sliding contact portion 24d is caused. This prevents the rotational torque from being reduced.

また、弾性シール部２４とエンコーダ３１が有機材同士で摺接し、且つ硬度差が適度に設定されているため、多少の部品の寸法誤差や軸受１０への荷重による変位等によって、プラスチック磁石（エンコーダ３１）とゴム（弾性シール部２４）との摺接に違いが生じたとしても、ゴム側で吸収されるので、各種性能に影響を与えることは少ない。さらに、プラスチック磁石とゴムの間に多少の芯ズレ等があっても、軸受１０の使用が進むに従って、最小且つ適切なラビリンス隙間が形成されて良好な接触状態となる。   In addition, since the elastic seal portion 24 and the encoder 31 are in sliding contact with each other between organic materials, and the hardness difference is set appropriately, a plastic magnet (encoder) is generated due to a dimensional error of some parts, displacement due to a load on the bearing 10, and the like. 31) Even if there is a difference in the sliding contact between the rubber (elastic seal portion 24), it is absorbed on the rubber side, so that it does not affect various performances. Furthermore, even if there is a slight misalignment between the plastic magnet and the rubber, a minimum and appropriate labyrinth gap is formed as the bearing 10 is used and a good contact state is obtained.

好ましくは、エンコーダ３１（プラスチック磁石）の硬度を８０〜１２０（ＡＳＴＭ Ｄ−７８５）、弾性シール部２４（ゴム）の硬度を６０〜９０（ＨＤＡ：デュロメータＡスケール）の範囲内とし、エンコーダ３１の硬度が、弾性シール部２４の硬度より高くなるように硬度差を設けるのがよい。このような硬度であれば、弾性シール部２４に過度な摩耗が起こる可能性が低くなる。   Preferably, the encoder 31 (plastic magnet) has a hardness of 80 to 120 (ASTM D-785) and the elastic seal portion 24 (rubber) has a hardness of 60 to 90 (HDA: durometer A scale). It is preferable to provide a hardness difference so that the hardness is higher than the hardness of the elastic seal portion 24. If it is such hardness, possibility that excessive wear will occur in elastic seal part 24 will become low.

また、弾性シール部２４の摺接部２４ｄの形状をリップ状として、摺動リップとしての低トルク性や密封性に重点を置く場合には、ゴム硬度は６０〜８０と軟らかめとすることが好ましい。また、摺接部２４ｄの形状を突起状とし、勢いよく跳ね掛かるスプラッシュに対するラビリンス効果に重点を置く場合には、ゴム硬度は７０〜９０位の硬めとすることが好ましい。   In addition, when the shape of the sliding contact portion 24d of the elastic seal portion 24 is a lip shape, and the emphasis is placed on the low torque property and the sealing property as the sliding lip, the rubber hardness may be as soft as 60-80. preferable. Further, when the shape of the sliding contact portion 24d is a protrusion and the emphasis is placed on the labyrinth effect against splash splashing vigorously, it is preferable that the rubber hardness is 70 to 90 degrees.

いずれにしても、エンコーダ３１の摺動面が樹脂であり、自己潤滑性が見込めるため、摩耗の過程での弾性シール部２４とエンコーダ３１の摺接による回転トルクの過度の増大を抑えることができる。さらに、万一、弾性シール部２４の摺接部２４ｄとエンコーダ３１が過度に接触したとしても、それぞれの損傷を軽微なものに留めることができる。   In any case, since the sliding surface of the encoder 31 is resin and self-lubricating property can be expected, an excessive increase in rotational torque due to the sliding contact between the elastic seal portion 24 and the encoder 31 during the wear process can be suppressed. . Furthermore, even if the sliding contact portion 24d of the elastic seal portion 24 and the encoder 31 are excessively in contact with each other, each damage can be kept small.

弾性シール部２４の摺接部２４ｄとエンコーダ３１の摺接部位は、図２に示すように、径方向寸法Ａ且つ軸方向寸法Ｂの範囲とすることが好ましい。即ち、エンコーダ３１の周速が速い部分（本実施形態では最大周速部分）に摺接部位を設定することが好ましい。これにより、弾性シール部２４の摺接部２４ｄが効率よく摩耗するので、早期に適切なラビリンス隙間が形成される。   The sliding contact portion 24d of the elastic seal portion 24 and the sliding contact portion of the encoder 31 are preferably in the range of the radial dimension A and the axial dimension B as shown in FIG. That is, it is preferable to set the slidable contact portion in the portion where the peripheral speed of the encoder 31 is fast (the maximum peripheral speed portion in the present embodiment). Accordingly, the sliding contact portion 24d of the elastic seal portion 24 is efficiently worn, so that an appropriate labyrinth gap is formed at an early stage.

また、樹脂及びゴムは、熱伝導の低い物質であるため、リップ摺接位置では局部的に温度が上昇する。そこで、エンコーダ３１（プラスチック磁石）のバインダとなる樹脂の融点を、弾性シール部２４（ゴム）の耐熱温度以下とすれば、樹脂が溶けることで適切なラビリンス隙間が早期に形成される。さらに、エンコーダ３１のバインダとして結晶性樹脂を採用し、摺接部の温度がガラス転移点以上になる条件を設定すれば、ガラス転移点以上で摺接部位の強度が低下するため、樹脂側（エンコーダ３１）の摩耗が進行して、適切なラビリンスが形成され易くなる。   Moreover, since resin and rubber are substances having low thermal conductivity, the temperature rises locally at the lip sliding position. Therefore, if the melting point of the resin serving as the binder of the encoder 31 (plastic magnet) is set to be equal to or lower than the heat resistant temperature of the elastic seal portion 24 (rubber), an appropriate labyrinth gap is formed at an early stage by melting the resin. Furthermore, if a crystalline resin is used as the binder of the encoder 31 and the condition that the temperature of the sliding contact portion is equal to or higher than the glass transition point is set, the strength of the sliding contact portion is decreased at the glass transition point or higher. As the wear of the encoder 31) progresses, an appropriate labyrinth is easily formed.

以上説明したように、本実施形態の密封装置１６によれば、外輪部材１１に固定され、第１円筒部４０及び第１円環部４１からなる断面略Ｌ字形状の芯金２３と、芯金２３に固着され、３個のシールリップ２４ａを有する弾性シール部２４と、内輪１３に固定され、第２円筒部４３及び第２円環部４４からなる断面略Ｌ字形状のスリンガ３０と、スリンガ３０に固着されるエンコーダ３１と、を備え、弾性シール部２４及びエンコーダ３１の径方向に対向する部分に、互いに摺接する摺接部２４ｄ及び摺接面３１ｂがそれぞれ形成され、エンコーダ３１の摺接面３１ｂの硬度が、弾性シール部２４の摺接部２４ｄの硬度より高く設定されるため、摺接面３１ｂと摺接部２４ｄが接触しても、硬度の低い摺接部２４ｄが適度に摩耗して、最小且つ適切なラビリンス隙間を形成することができる。また、摺接面３１ｂと摺接部２４ｄとの摺接が、有機材同士の摺接であるので、摺接部２４ｄ及び摺接面３１ｂの過度な摩耗を防止して、回転トルクを低減することができる。   As described above, according to the sealing device 16 of the present embodiment, the metal core 23 fixed to the outer ring member 11 and having a substantially L-shaped cross section including the first cylindrical portion 40 and the first annular portion 41, and the core An elastic seal portion 24 fixed to the gold 23 and having three seal lips 24a; a slinger 30 having a substantially L-shaped cross section, which is fixed to the inner ring 13 and includes a second cylindrical portion 43 and a second annular portion 44; An encoder 31 fixed to the slinger 30, and a sliding contact portion 24 d and a sliding contact surface 31 b that are in sliding contact with each other are formed at portions of the elastic seal portion 24 and the encoder 31 that are opposed to each other in the radial direction. Since the hardness of the contact surface 31b is set higher than the hardness of the slidable contact portion 24d of the elastic seal portion 24, even if the slidable contact surface 31b and the slidable contact portion 24d come into contact with each other, the low-hardness slidable contact portion 24d is appropriately Worn, minimal and It is possible to form a suitable labyrinth clearance. Further, since the sliding contact between the sliding contact surface 31b and the sliding contact portion 24d is a sliding contact between organic materials, excessive wear of the sliding contact portion 24d and the sliding contact surface 31b is prevented, and the rotational torque is reduced. be able to.

（第２実施形態）
次に、図３〜図５を参照して、本発明に係る密封装置の第２実施形態について説明する。なお、第１実施形態と同一又は同等部分については、図面に同一符号を付してその説明を省略或いは簡略化する。 (Second Embodiment)
Next, a second embodiment of the sealing device according to the present invention will be described with reference to FIGS. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted or simplified.

本実施形態の密封装置１６Ａでは、図３及び図４に示すように、弾性シール部２４及びエンコーダ３１の径方向に対向する部分に、複数（本実施形態では６個）のリング状の摺接部２４ｄ，３１ｃがそれぞれ形成されている。また、本実施形態の摺接部２４ｄ，３１ｃは、密封装置１６Ａの軸線に対して直交する面と平行に形成されている。   In the sealing device 16A of the present embodiment, as shown in FIGS. 3 and 4, a plurality (six in this embodiment) of ring-shaped sliding contacts are formed on the radially opposing portions of the elastic seal portion 24 and the encoder 31. Portions 24d and 31c are formed, respectively. In addition, the sliding contact portions 24d and 31c of the present embodiment are formed in parallel to a plane orthogonal to the axis of the sealing device 16A.

以上説明したように、本実施形態の密封装置１６Ａによれば、弾性シール部２４の複数の摺接部２４ｄとエンコーダ３１の複数の摺接部３１ｃが、互いに線接触状態で摺接するので、摩擦抵抗を低減することができ、回転トルクを低減することができる。また、摺接部２４ｄ，３１ｃが複数あるため、密封性能を高めることができる。さらに、摺接部２４ｄ，３１ｃの凹凸が小さいため、比較的早期に摺接部２４ｄ又は摺接部３１ｃが摩耗して、摺接部２４ｄ，３１ｃの数に応じた複数の適切なラビリンス隙間が形成されて、密封性能を更に高めることができる。
その他の構成及び作用効果については、上記第１実施形態と同様である。 As described above, according to the sealing device 16A of the present embodiment, the plurality of sliding contact portions 24d of the elastic seal portion 24 and the plurality of sliding contact portions 31c of the encoder 31 are in sliding contact with each other in a line contact state. Resistance can be reduced and rotational torque can be reduced. Further, since there are a plurality of sliding contact portions 24d and 31c, the sealing performance can be improved. Further, since the unevenness of the sliding contact portions 24d and 31c is small, the sliding contact portion 24d or the sliding contact portion 31c is worn relatively early, and a plurality of appropriate labyrinth gaps corresponding to the number of the sliding contact portions 24d and 31c are formed. Thus, the sealing performance can be further enhanced.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

なお、本実施形態の変形例として、図５に示すように、複数のリング状の摺接部２４ｄ，３１ｃを、密封装置１６Ａの軸線に対して互いに逆方向となるように傾斜させてもよい。この場合、複数の摺接部２４ｄ，３１ｃが互いに点接触状態で摺接するので、軸方向から見て壁ができた状態でありつつ、低摩擦、且つラビリンス隙間の自己形成性を向上することができる。この形態での複数の摺接部は、各々が独立した環状であり、螺旋（ネジ）状とはなっていない。   As a modification of the present embodiment, as shown in FIG. 5, the plurality of ring-shaped sliding contact portions 24d and 31c may be inclined so as to be opposite to each other with respect to the axis of the sealing device 16A. . In this case, since the plurality of sliding contact portions 24d and 31c are in sliding contact with each other in a point contact state, it is possible to improve the self-formability of the labyrinth gap with low friction while the wall is formed when viewed from the axial direction. it can. Each of the plurality of sliding contact portions in this form is an independent ring, and is not in a spiral (screw) shape.

（第３実施形態）
次に、図６及び図７を参照して、本発明に係る密封装置の第３実施形態について説明する。なお、第１及び第２実施形態と同一又は同等部分については、図面に同一符号を付してその説明を省略或いは簡略化する。 (Third embodiment)
Next, with reference to FIG.6 and FIG.7, 3rd Embodiment of the sealing device which concerns on this invention is described. Note that the same or equivalent parts as those in the first and second embodiments are denoted by the same reference numerals in the drawings, and the description thereof is omitted or simplified.

本実施形態の密封装置１６Ｂ１では、図６に示すように、弾性シール部２４のエンコーダ３１の外周面である摺接面３１ｂに対向する部分に、複数（本実施形態では９個）のリング状の摺接部２４ｄが形成され、この複数の摺接部２４ｄを摺接面３１ｂに摺接させている。   In the sealing device 16B1 of this embodiment, as shown in FIG. 6, a plurality (9 in this embodiment) of ring-shaped portions are provided on the portion of the elastic seal portion 24 that faces the sliding contact surface 31b that is the outer peripheral surface of the encoder 31. The sliding contact portions 24d are formed, and the plurality of sliding contact portions 24d are in sliding contact with the sliding contact surface 31b.

本実施形態の密封装置１６Ｂ１は、上記第２実施形態の密封装置１６Ａと比較して、エンコーダ３１の外周面に複数のリング状の摺接部が形成されていないので、コスト的に有利である。即ち、エンコーダ３１の外周面に複数のリング状の摺接部を形成するには、径方向にパーティションラインが設定される、所謂、ラジアルドローといわれる成形方法を採用する必要があり、樹脂成形部品の寸法精度的には不利となる。また、多数個取りもできないのでコスト的にも不利となる。   The sealing device 16B1 of this embodiment is advantageous in terms of cost because a plurality of ring-shaped slidable contact portions are not formed on the outer peripheral surface of the encoder 31 as compared with the sealing device 16A of the second embodiment. . That is, in order to form a plurality of ring-shaped sliding contact portions on the outer peripheral surface of the encoder 31, it is necessary to employ a so-called molding method called a radial draw in which partition lines are set in the radial direction. This is disadvantageous in terms of dimensional accuracy. Moreover, since it cannot take many, it becomes disadvantageous also in cost.

しかし、本実施形態のエンコーダ３１では、樹脂成形部品の寸法精度が比較的良好な、所謂、アキシアルドロー方式が採用されるので上記のような問題はない。なお、コストよりも精度等を優先する場合には、エンコーダ３１は、丸棒等からの削出し加工（旋盤加工、研削加工等）や、射出成形後に旋盤加工や研削加工をエンコーダ単体で行った後、スリンガに接着してもよい。スリンガと一体で射出成形する場合のエンコーダ３１の形状は、後述する本実施形態の変形例のエンコーダ３１の形状の方が好ましい。また、弾性シール部２４は、弾性を有するので無理抜きすることができ、アキシアルドロー方式により問題なく成形が可能である。   However, the encoder 31 according to the present embodiment employs a so-called axial draw method in which the dimensional accuracy of the resin molded part is relatively good, so that there is no problem as described above. In addition, when priority is given to accuracy over cost, the encoder 31 performs machining (turning, grinding, etc.) from a round bar or the like, and lathe processing or grinding after injection molding with a single encoder. Later, it may be adhered to a slinger. The shape of the encoder 31 in the case of injection molding integrally with the slinger is preferably the shape of the encoder 31 of a modified example of this embodiment described later. Further, since the elastic seal portion 24 has elasticity, it can be forcibly removed and can be molded without any problem by the axial draw method.

なお、左右輪用の密封装置１６Ｂ１が別部品として設定されており、それぞれの密封装置１６Ｂ１ごとに回転方向が特定可能な場合は、複数のリング状の摺接部２４ｄを、ネジポンプで排出効果の見込める方向とするのが好ましい。   In addition, when the sealing device 16B1 for the left and right wheels is set as a separate part and the rotation direction can be specified for each sealing device 16B1, a plurality of ring-shaped sliding contact portions 24d can be discharged with a screw pump. It is preferable that the direction is expected.

また、本実施形態の変形例として、エンコーダ３１をスリンガ３０と一体に射出成形する場合には、図７に示すように、密封装置１６Ｂ１の代わりに密封装置１６Ｂ２を使用してもよい。この密封装置１６Ｂ２では、エンコーダ３１の外周縁部がスリンガ３０の第２円環部４４の軸方向内側にまで延伸されているので、溶融した樹脂をスリンガ平面部で型締めして止め、サイドリップの摺接面への樹脂流れを防止できる。本変形例によれば、エンコーダ３１とスリンガ３０の接着面積が増え、固着が安定するので、形成されたラビリンス隙間をより安定にすることができる。
その他の構成及び作用効果については、上記第１及び第２実施形態と同様である。 As a modification of the present embodiment, when the encoder 31 is injection-molded integrally with the slinger 30, a sealing device 16B2 may be used instead of the sealing device 16B1 as shown in FIG. In this sealing device 16B2, since the outer peripheral edge of the encoder 31 extends to the inside in the axial direction of the second annular portion 44 of the slinger 30, the molten resin is clamped and stopped at the slinger flat portion, and the side lip is The resin flow to the sliding contact surface can be prevented. According to this modification, the adhesion area between the encoder 31 and the slinger 30 is increased and the fixation is stable, so that the formed labyrinth gap can be made more stable.
About another structure and an effect, it is the same as that of the said 1st and 2nd embodiment.

（第４実施形態）
次に、図８を参照して、本発明に係る密封装置の第４実施形態について説明する。なお、第１及び第２実施形態と同一又は同等部分については、図面に同一符号を付してその説明を省略或いは簡略化する。 (Fourth embodiment)
Next, with reference to FIG. 8, 4th Embodiment of the sealing device which concerns on this invention is described. Note that the same or equivalent parts as those in the first and second embodiments are denoted by the same reference numerals in the drawings, and the description thereof is omitted or simplified.

本実施形態の密封装置１６Ｃでは、図８に示すように、エンコーダ３１の外周面に、複数（本実施形態では６個）のリング状の摺接部３１ｃが形成され、この複数の摺接部３１ｃを、弾性シール部２４のエンコーダ３１の外周面に対向する部分に形成される平面状の摺接面２４ｅに摺接させている。   In the sealing device 16C of this embodiment, as shown in FIG. 8, a plurality (six in this embodiment) of ring-shaped sliding contact portions 31c are formed on the outer peripheral surface of the encoder 31, and the plurality of sliding contact portions 31c is brought into sliding contact with a planar sliding contact surface 24e formed on a portion of the elastic seal portion 24 facing the outer peripheral surface of the encoder 31.

本実施形態の密封装置１６Ｃによれば、エンコーダ３１の複数の摺接部３１ｃの形状に倣って、弾性シール部２４の摺接面２４ｅが凹凸状に摩耗するので、凹凸状のラビリンス隙間が形成される。これにより、ラビリンス隙間形成後の密封性能は優れたものとなる。また、エンコーダ３１が回転するので、複数の摺接部３１ｃの溝部に泥など詰まることがなく、弾性シール部２４の摺接面２４ｅを必要以上に摩耗させることはない。   According to the sealing device 16C of the present embodiment, the sliding contact surface 24e of the elastic seal portion 24 wears unevenly following the shape of the plurality of sliding contact portions 31c of the encoder 31, so that an uneven labyrinth gap is formed. Is done. Thereby, the sealing performance after forming the labyrinth gap is excellent. Further, since the encoder 31 rotates, the groove portions of the plurality of sliding contact portions 31c are not clogged with mud and the sliding contact surface 24e of the elastic seal portion 24 is not worn more than necessary.

なお、上記第２実施形態の密封装置１６Ａのように、複数の摺接部３１ｃにリード角をつけてポンピング作用を持たせることも可能となる。しかし、上記第３実施形態で説明したように、コスト的には多少不利となる。
その他の構成及び作用効果については、上記第１及び第２実施形態と同様である。 Note that, as in the sealing device 16A of the second embodiment, a plurality of sliding contact portions 31c can be provided with a lead angle to have a pumping action. However, as described in the third embodiment, the cost is somewhat disadvantageous.
About another structure and an effect, it is the same as that of the said 1st and 2nd embodiment.

（第５実施形態）
次に、図９を参照して、本発明に係る密封装置の第５実施形態について説明する。なお、第１及び第３実施形態と同一又は同等部分については、図面に同一符号を付してその説明を省略或いは簡略化する。 (Fifth embodiment)
Next, a fifth embodiment of the sealing device according to the present invention will be described with reference to FIG. Note that portions that are the same as or equivalent to those in the first and third embodiments are denoted by the same reference numerals in the drawings, and description thereof is omitted or simplified.

本実施形態の密封装置１６Ｄでは、図９に示すように、上記第３実施形態における弾性シール部２４の複数の摺接部２４ｄとエンコーダ３１の摺接面３１ｂが、軸方向外側（図中右側）に向かうに従って次第に大径となるように傾斜して形成されている。   In the sealing device 16D of the present embodiment, as shown in FIG. 9, the plurality of sliding contact portions 24d of the elastic seal portion 24 and the sliding contact surface 31b of the encoder 31 in the third embodiment are axially outer (right side in the figure). ) Incline so as to gradually increase in diameter as it goes to.

本実施形態の密封装置１６Ｄによれば、弾性シール部２４の複数の摺接部２４ｄとエンコーダ３１の摺接面３１ｂが傾斜しているので、エンコーダ３１の摺接面３１ｂに付着した異物（水等）を、遠心力により外部に容易に排出することができる。   According to the sealing device 16D of the present embodiment, since the plurality of sliding contact portions 24d of the elastic seal portion 24 and the sliding contact surface 31b of the encoder 31 are inclined, the foreign matter (water) attached to the sliding contact surface 31b of the encoder 31 Etc.) can be easily discharged to the outside by centrifugal force.

また、不図示ではあるが、上記第２実施形態における弾性シール部２４及びエンコーダ３１の複数の摺接部２４ｄ，３１ｃが、上記と同じく傾斜して形成されていてもよい。この場合、エンコーダ３１の複数の摺接部３１ｃを階段状に形成すれば、アキシアルドロー方式でエンコーダ３１の成形が可能となり、寸法精度が安定し、コスト的に有利となる。なお、上記第１実施形態の弾性シール部２４の１個の摺接部２４ｄとエンコーダ３１の摺接面３１ｂ、及び上記第４実施形態の弾性シール部２４の摺接面２４ｅとエンコーダ３１の複数の摺接部３１ｃを、上記と同じように傾斜させて形成してもよい。
その他の構成及び作用効果については、上記第１及び第３実施形態と同様である。 Although not shown, the elastic seal portion 24 and the plurality of sliding contact portions 24d and 31c of the encoder 31 in the second embodiment may be formed to be inclined as described above. In this case, if the plurality of sliding contact portions 31c of the encoder 31 are formed in a step shape, the encoder 31 can be formed by the axial draw method, the dimensional accuracy is stabilized, and the cost is advantageous. Note that one sliding contact portion 24d of the elastic seal portion 24 of the first embodiment and the sliding contact surface 31b of the encoder 31 and a plurality of sliding contact surfaces 24e of the elastic seal portion 24 of the fourth embodiment and the encoder 31 are provided. The sliding contact portion 31c may be formed to be inclined in the same manner as described above.
About another structure and an effect, it is the same as that of the said 1st and 3rd embodiment.

（第６実施形態）
次に、図１０を参照して、本発明に係る密封装置の第６実施形態について説明する。
なお、第１及び第５実施形態と同一又は同等部分については、図面に同一符号を付してその説明を省略或いは簡略化する。 (Sixth embodiment)
Next, a sixth embodiment of the sealing device according to the present invention will be described with reference to FIG.
Note that the same or equivalent parts as those in the first and fifth embodiments are denoted by the same reference numerals in the drawings, and the description thereof is omitted or simplified.

本実施形態の密封装置１６Ｅでは、図１０に示すように、上記第５実施形態におけるエンコーダ３１の摺接面３１ｂが円弧状に形成されている。なお、摺接面３１ｂを円弧状に形成することは、アキシアルドロー方式の成形方法で容易に成形可能である。
その他の構成及び作用効果については、上記第１及び第５実施形態と同様である。 In the sealing device 16E of the present embodiment, as shown in FIG. 10, the slidable contact surface 31b of the encoder 31 in the fifth embodiment is formed in an arc shape. In addition, forming the slidable contact surface 31b in an arc shape can be easily formed by an axial draw method.
About another structure and an effect, it is the same as that of the said 1st and 5th embodiment.

１０ ハブユニット軸受
１１ 外輪部材（静止部材）
１２ ハブ輪（内輪部材、回転部材）
１３ 内輪（回転部材）
１６ 密封装置
１６Ａ 密封装置
１６Ｂ１ 密封装置
１６Ｂ２ 密封装置
１６Ｃ 密封装置
１６Ｄ 密封装置
１６Ｅ 密封装置
２３ 芯金
２４ 弾性シール部
２４ａ シールリップ
２４ｄ 摺接部
２４ｅ 摺接面（摺接部）
３０ スリンガ
３１ エンコーダ
３１ｂ 摺接面（摺接部）
３１ｃ 摺接部
４０ 第１円筒部
４１ 第１円環部
４３ 第２円筒部
４４ 第２円環部 10 Hub unit bearing 11 Outer ring member (stationary member)
12 Hub wheel (inner ring member, rotating member)
13 Inner ring (rotating member)
16 sealing device 16A sealing device 16B1 sealing device 16B2 sealing device 16C sealing device 16D sealing device 16E sealing device 23 cored bar 24 elastic sealing portion 24a sealing lip 24d sliding contact portion 24e sliding contact surface (sliding contact portion)
30 Slinger 31 Encoder 31b Sliding contact surface (sliding contact portion)
31c Sliding part 40 1st cylindrical part 41 1st ring part 43 2nd cylinder part 44 2nd ring part

Claims (5)

同心上に配置されて相対回転可能に組み付けられる回転部材、及び静止部材間をシールする密封装置であって、
前記回転部材及び前記静止部材の一方に固定され、第１円筒部及び第１円環部からなる断面略Ｌ字形状の芯金と、
前記芯金に固着され、少なくとも１つのシールリップを有する弾性シール部と、
前記回転部材及び前記静止部材の他方に固定され、第２円筒部及び第２円環部からなる断面略Ｌ字形状のスリンガと、
前記スリンガに固着されるエンコーダと、を備え、
前記弾性シール部及び前記エンコーダの径方向に対向する部分に、互いに摺接する摺接部がそれぞれ形成され、
前記エンコーダの前記摺接部の硬度が、前記弾性シール部の前記摺接部の硬度より高く設定されることを特徴とする密封装置。 A rotating member that is arranged concentrically and is assembled so as to be relatively rotatable, and a sealing device that seals between stationary members,
A cored bar having a substantially L-shaped cross section, which is fixed to one of the rotating member and the stationary member and includes a first cylindrical portion and a first annular portion;
An elastic seal portion fixed to the core metal and having at least one seal lip;
A slinger having a substantially L-shaped cross section, which is fixed to the other of the rotating member and the stationary member, and includes a second cylindrical portion and a second annular portion;
An encoder fixed to the slinger,
Sliding contact portions that are in sliding contact with each other are formed on the elastic seal portion and the portion facing the radial direction of the encoder,
The sealing device according to claim 1, wherein a hardness of the sliding contact portion of the encoder is set higher than a hardness of the sliding contact portion of the elastic seal portion. 前記エンコーダは樹脂を含む材料で形成され、前記弾性シール部はゴムで形成されることを特徴とする請求項１に記載の密封装置。   The sealing device according to claim 1, wherein the encoder is made of a material containing resin, and the elastic seal portion is made of rubber. 前記密封装置は、車両の車軸を回転自在に支持するハブユニット軸受の外輪部材と内輪部材間に配設される密封装置であることを特徴とする請求項１又は２に記載の密封装置。   The sealing device according to claim 1, wherein the sealing device is a sealing device disposed between an outer ring member and an inner ring member of a hub unit bearing that rotatably supports an axle of a vehicle. 請求項１又は２に記載の密封装置を備えることを特徴とする転がり軸受。   A rolling bearing comprising the sealing device according to claim 1. 請求項３に記載の密封装置を備えることを特徴とするハブユニット軸受。   A hub unit bearing comprising the sealing device according to claim 3.
JP2010075080A 2010-03-29 2010-03-29 Sealing device, rolling bearing provided with sealing device, and hub unit bearing Expired - Fee Related JP5459012B2 (en)

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