JP6540433B2 - Sealing device and hub unit bearing with sealing device - Google Patents

Sealing device and hub unit bearing with sealing device Download PDF

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JP6540433B2
JP6540433B2 JP2015193078A JP2015193078A JP6540433B2 JP 6540433 B2 JP6540433 B2 JP 6540433B2 JP 2015193078 A JP2015193078 A JP 2015193078A JP 2015193078 A JP2015193078 A JP 2015193078A JP 6540433 B2 JP6540433 B2 JP 6540433B2
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diameter side
seal
inner diameter
outer diameter
lip
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JP2017067166A (en
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梨紗 青木
梨紗 青木
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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
    • 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
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of 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
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Description

本発明は、自動車の車輪を懸架装置に対して回転自在に支持する軸受ユニットのうち、転動体を設置した内部空間の端部開口を塞ぐ密封装置、及びこの密封装置を装着した密封装置付ハブユニット軸受に関する。   The present invention relates to a sealing device for closing an end opening of an internal space in which rolling elements are installed among bearing units rotatably supporting a wheel of an automobile with respect to a suspension device, and a hub provided with the sealing device It relates to a unit bearing.

自動車の車輪を懸架装置に対して回転自在に支持する密封装置付ハブユニット軸受として、例えば、図５に示す様な構造が知られている。密封装置付ハブユニット軸受１は、静止側軌道輪である外輪２と回転側軌道輪であるハブ３とを互いに同心に配置している。そして、外輪２の内周面に設けた複列の外輪軌道４と、ハブ３の外周面に設けた複列の内輪軌道５との間に、転動体である玉６を、各列に複数個ずつ転動自在に配置している。ハブ３の外周面には、車輪（不図示）を支持固定する為の回転フランジ７を設けている。本構成により、懸架装置に支持固定される外輪２の内径側に、車輪を固定したハブ３を回転自在に支持している。   For example, a structure as shown in FIG. 5 is known as a hub unit bearing with a sealing device that rotatably supports a wheel of a vehicle with respect to a suspension system. The hub unit bearing 1 with a sealing device has the outer ring 2 as a stationary bearing ring and the hub 3 as a rotating bearing ring arranged concentrically to each other. Then, between the double row outer ring raceway 4 provided on the inner peripheral surface of the outer ring 2 and the double row inner ring raceway 5 provided on the outer peripheral surface of the hub 3 They are arranged so that they can roll freely. The outer peripheral surface of the hub 3 is provided with a rotating flange 7 for supporting and fixing a wheel (not shown). According to this configuration, the hub 3 with the wheels fixed is rotatably supported on the inner diameter side of the outer ring 2 supported and fixed to the suspension device.

外輪２の内周面とハブ３の外周面との間で、玉６を設置してグリースが封入された内部空間８の両端開口は、それぞれが密封装置であるシールリング９と組み合わせシールリング１０とにより、全周に亙り塞いでいる。シールリング９は、金属板製の芯金１１とシール部材１２とを備えている。シール部材１２は、ゴムの如きエラストマー製で、複数本（図示の例では３本）のシールリップ１３を有している。そして、芯金１１を外輪２の軸方向一端部の内周面に締り嵌めで内嵌した状態で、各シールリップ１３の先端縁をハブ３の外周面に、それぞれ全周に亙り摺接させている。   Between the inner peripheral surface of the outer ring 2 and the outer peripheral surface of the hub 3, the ball 6 is installed and the openings at both ends of the internal space 8 in which the grease is sealed are combined with the seal ring 9 which is a sealing device. And it is blocking all around. The seal ring 9 is provided with a metal plate core 11 and a seal member 12. The seal member 12 is made of an elastomer such as rubber and has a plurality of (three in the illustrated example) seal lips 13. Then, in a state in which the core metal 11 is internally fitted on the inner peripheral surface of one end of the outer ring 2 in the axial direction by close fitting, the tip end edge of each seal lip 13 is in sliding contact with the outer peripheral surface of the hub 3 all around. ing.

図６（特許文献１参照）に示す組み合わせシールリング１０は、外径側シールリング１４と内径側シールリング１５とを組み合わせて成る。外径側シールリング１４は、金属板製の外径側芯金１６とシール部材１９とを備えている。外径側芯金１６は、金属板を曲げ成形する事により断面Ｌ字形で全体を円環状に構成したもので、外径側円筒部１７と、外径側円筒部１７の軸方向端縁から径方向内側に折れ曲がった外径側円輪部１８とから成る。シール部材１９は、シールリップ２０ｃを備えている。この様な外径側シールリング１４は、外径側円筒部１７を外輪２の軸方向他端部の内周面に締り嵌めで内嵌固定している。一方、内径側シールリング１５は、金属板製の内径側芯金２１とシール部材２４とを備えている。内径側芯金２１は、金属板を曲げ成形する事により断面Ｌ字形で全体を円環状に構成したもので、内径側円筒部２２と、内径側円筒部２２の軸方向端縁から径方向外側に折れ曲がった内径側円輪部２３とから成る。シール部材２４は、２本のシールリップ２０ａ，２０ｂを備えている。内径側円輪部２３の軸方向側面には、エンコーダ２５が固定されている。この様な内径側シールリング１５は、内径側円筒部２２をハブ３の軸方向他端部の外周面に締り嵌めで外嵌固定している。   A combined seal ring 10 shown in FIG. 6 (see Patent Document 1) is formed by combining an outer diameter side seal ring 14 and an inner diameter side seal ring 15. The outer diameter side seal ring 14 includes an outer diameter side metal core 16 made of a metal plate and a seal member 19. The outer diameter side metal core 16 is formed by bending the metal plate to form an L-shaped cross section to form the whole in an annular shape, and from the axial direction edge of the outer diameter side cylindrical portion 17 and the outer diameter side cylindrical portion 17 It comprises the radially outer ring portion 18 bent radially inward. The seal member 19 is provided with a seal lip 20c. Such an outer diameter side seal ring 14 has the outer diameter side cylindrical portion 17 fitted and fixed to the inner peripheral surface of the other axial end portion of the outer ring 2 by tight fitting. On the other hand, the inner diameter side seal ring 15 is provided with an inner diameter side core metal 21 made of a metal plate and a seal member 24. The inner diameter side core metal 21 is formed by bending the metal plate to form an L-shaped cross section to form an annular shape as a whole. The inner diameter side cylindrical portion 22 and the radial direction outer side from the axial direction edge of the inner diameter side cylindrical portion 22 And an inner diameter side annular portion 23 which is bent in The seal member 24 is provided with two seal lips 20a and 20b. An encoder 25 is fixed to the axial side surface of the inner diameter side circular ring portion 23. The inner diameter side seal ring 15 has the inner diameter side cylindrical portion 22 fitted and fixed to the outer peripheral surface of the other axial end portion of the hub 3 by tight fitting.

外径側シールリング１４と内径側シールリング１５とを組み合わせた状態で、外径側シールリング１４を構成するシールリップ２０ｃの先端縁を、内径側芯金２１を構成する内径側円筒部２２の外周面に、全周に亙って摺接させている。これに対して、内径側シールリング１５を構成するシールリップ２０ａ，２０ｂの先端縁を、外径側芯金１６を構成する外径側円筒部１７の内周面、及び外径側円輪部１８の軸方向側面に、それぞれ全周に亙って摺接させている。尚、図６には、各シールリップ２０ａ，２０ｂ，２０ｃの自由状態での形状を示している。   In a state where the outer diameter side seal ring 14 and the inner diameter side seal ring 15 are combined, the tip end edge of the seal lip 20 c constituting the outer diameter side seal ring 14 is the inner diameter side cylindrical portion 22 constituting the inner diameter side metal core 21. The outer peripheral surface is in sliding contact with the entire circumference. On the other hand, the tip edges of the seal lips 20a and 20b constituting the inner diameter side seal ring 15 are the inner peripheral surface of the outer diameter side cylindrical portion 17 constituting the outer diameter side core metal 16, and the outer diameter side annular ring portion Each of the 18 axial side surfaces is in sliding contact with the entire circumference. FIG. 6 shows the shapes of the seal lips 20a, 20b and 20c in the free state.

上述した様な組み合わせシールリング１０は、小形で低トルクでありながら、３枚の外向きのシールリップ（シールリップの先端部が外部空間側に向いた状態で形成）により高い密封性と耐久性とを備えている。しかしながら、泥水等がかかる厳しい条件で使用される密封装置付ハブユニット軸受１の耐久性を確保する為には、組み合わせシールリング１０の更なる密封性能の向上が求められている。近年の自動車が使用される地域の広がりに伴い、未舗装道路で使用される車両が増加してきており、特に、回転する車輪が泥水（雨水）等を跳ね上げるスプラッシュへの耐性が、密封装置に対して求められている。   The combination seal ring 10 as described above has high sealing performance and durability due to three outward seal lips (formed with the tip of the seal lip facing the outer space side) while having a small size and low torque. And have. However, in order to ensure the durability of the hub unit bearing 1 with a sealing device used under such severe conditions as muddy water, further improvement of the sealing performance of the combined seal ring 10 is required. With the spread of areas where automobiles are used in recent years, vehicles used on unpaved roads are increasing, and in particular, the resistance to the splash that the rotating wheels bounce up muddy water (rainwater) etc. is the sealing device. It is sought for.

特開２００７−２９２０９２号公報Unexamined-Japanese-Patent No. 2007-292092 特開昭５９−１６４４５７号公報JP-A-59-164457

本発明は、上述の様な事情に鑑みて、ハブユニット軸受の内部空間の端部開口を塞ぐ、密封装置である組み合わせシールリングの密封性能に関して、特にスプラッシュへの耐性を向上して、耐久性を確保した密封装置、及び密封装置付ハブユニット軸受を提供する事を課題とする。   In view of the circumstances as described above, the present invention improves the seal performance of the combination seal ring, which is a seal device, closing the end opening of the internal space of the hub unit bearing, and in particular, improves the splash resistance and durability. It is an object of the present invention to provide a sealing device and a hub unit bearing with the sealing device.

本発明の密封装置は、外径側シールリングと内径側シールリングとを組み合わせて成り、前記外径側シールリングは、外径側芯金とシールリップとを備え、全体を円環状に構成された前記外径側芯金は、外径側円筒部と、前記外径側円筒部の軸方向端縁から径方向内側に延びる外径側円輪部とから成り、前記内径側シールリングは、内径側芯金とシール部材とを備え、全体を円環状に構成された前記内径側芯金は、内径側円筒部と、前記内径側円筒部の軸方向端縁から径方向外側に延びる内径側円輪部とから成り、前記シール部材は、第１シールリップと、第２シールリップと、ラビリンスリップとを有し、
前記外径側シールリングのシールリップが、前記内径側円筒部に摺接しており、前記内径側シールリングの第１シールリップが、前記外径側円筒部に摺接し、前記内径側シールリングの第２シールリップが、前記外径側円輪部に摺接している。 The sealing device of the present invention is formed by combining an outer diameter side seal ring and an inner diameter side seal ring, and the outer diameter side seal ring is provided with an outer diameter side metal core and a seal lip, and is entirely formed in an annular shape. The outer diameter side core metal comprises an outer diameter side cylindrical portion and an outer diameter side annular portion extending radially inward from an axial end edge of the outer diameter side cylindrical portion, and the inner diameter side seal ring and a inner diameter side core metal and the seal member, the inner diameter side core metal that is configured to generally annular, the inner diameter side cylindrical portion, the inner diameter side extending radially outward from an axial end edge of the inner diameter side cylindrical portion The seal member has a first seal lip, a second seal lip, and a labyrinth slip.
The seal lip of the outer diameter side seal ring is in sliding contact with the inner diameter side cylindrical portion, and the first seal lip of the inner diameter side seal ring is in sliding contact with the outer diameter side cylindrical portion . A second seal lip is in sliding contact with the outer diameter side annular portion.

特に、本発明の密封装置に於いては、前記外径側円輪部の内周縁にグリースリップを設け、前記グリースリップの先端部は、径方向内側に向かうに従い軸方向内部側に延びた状態で、前記内径側円筒部に対して全周に亙って摺接しており、前記内径側円輪部の外周縁に前記ラビリンスリップを設け、前記ラビリンスリップの先端部は、前記外径側円筒部の軸方向外部側の内周面に対して全周に亙って近接対向して、ラビリンスシールを形成し、
前記内径側シールリングの第１シールリップと前記ラビリンスリップとの間の部分において前記内径側円輪部の外径面を覆う部分の前記シール部材の最小外径と、前記内径側円輪部の外径との厚さを、前記ラビリンスリップの基端部の厚さ以上に設け、
前記ラビリンスリップの軸方向外部側面において前記ラビリンスリップの基端部よりも小径となる部分に、軸方向内部側に凹むシール凹部を設け、
前記ラビリンスシールのラビリンス隙間を、前記内径側シールリングの第１シールリップの先端部の厚さ以下に設けている。
更に、前記ラビリンスリップの先端面を傾斜面に設けて、前記ラビリンス隙間を傾斜して形成している。
更に、密封装置付ハブユニット軸受は、内周面に外輪軌道を有する外輪と、外周面に内輪軌道を有するハブと、前記外輪軌道と前記内輪軌道との間に転動自在に設けられた複数の転動体と、前記転動体を設置した内部空間の端部開口を塞ぐ組み合わせシールリングとを備えており、前記組み合わせシールリングが、前記密封装置である。 In particular, in the sealing device according to the present invention, the grease lip is provided on the inner peripheral edge of the outer diameter side annular portion, and the tip of the grease lip extends inward in the axial direction as it extends radially inward. in, and sliding contact over the entire circumference to the inner diameter side cylindrical portion, the labyrinth lip provided on the outer peripheral edge of the inner diameter side annular portion, the tip portion of the labyrinth lip, the outer diameter side cylindrical Form a labyrinth seal in close proximity to the entire inner circumference of the inner peripheral surface on the outer side in the axial direction of the part ,
In the portion between the first seal lip of the inner diameter side seal ring and the labyrinth slip, the minimum outer diameter of the seal member of the portion covering the outer diameter surface of the inner diameter side annular portion and the inner diameter side annular portion The thickness of the outer diameter and the thickness of the proximal end portion of the labyrinth slip are provided,
An axially outer side surface of the labyrinth slip is provided with a seal recess which is recessed inwardly in the axial direction at a portion smaller in diameter than the proximal end of the labyrinth slip,
The labyrinth gap of the labyrinth seal is provided equal to or less than the thickness of the tip portion of the first seal lip of the inner diameter side seal ring.
Furthermore, the end face of the labyrinth slip is provided on an inclined face, and the labyrinth gap is formed to be inclined.
Furthermore, the hub unit bearing with the sealing device is provided with an outer ring having an outer ring raceway on the inner peripheral surface, a hub having an inner ring raceway on the outer peripheral surface, and a plurality of rollers provided rotatably between the outer ring raceway and the inner ring raceway. And a combination seal ring for closing an end opening of an internal space in which the rolling elements are installed, the combination seal ring being the sealing device.

上述の様に構成する本発明の密封装置によれば、外径側シールリングと内径側シールリングとの間に存在する、組み合わせシールリングの密封空間への、泥水等の異物の侵入を効果的に防止できる。即ち、本発明の密封装置である組み合わせシールリングの場合、ラビリンスシールを、外径側シールリングと内径側シールリングとの間に存在する密封空間の外部空間側に設けている為、ラビリンスシールを通過して、外部空間から密封空間迄入り込む異物（スプラッシュ）の量を、僅少に抑えられる。弾性材製のラビリンスリップによりラビリンス隙間の幅を狭くできる為、ラビリンスシールを通過する異物の量を僅少に抑えられる。この結果、本発明の密封装置は長期間に亙り良好な密封性能を得られ、この密封装置を装着した、密封装置付きハブユニット軸受の耐久性を確保できる。
また、内径側シールリングを製造する工程において加硫成形が完了した内径側シールリングを成形金型から取り出す場合、シールリップとラビリンスリップとの間にある部分は、ラビリンスリップを変形させて引き抜く必要がある（所謂無理抜き）。本発明では、内径側シールリングの第１シールリップとラビリンスリップとの間の部分において内径側円輪部の外径面を覆う部分のシール部材の最小外径と、内径側円輪部の外径との厚さを、ラビリンスリップの基端部の厚さ以上に設けている。このため、無理抜きした場合でも、シール部材を強固に固定することができる。更に、本発明では、ラビリンスリップの軸方向外部側面においてラビリンスリップの基端部よりも小径となる位置に、軸方向内部側に凹むシール凹部を設けている。このため、無理抜き時にラビリンスリップを容易に変形することができる。
また、ラビリンスシールのラビリンス隙間を、内径側シールリングの第１シールリップの先端部の厚さ以下に設けている。このため、ラビリンスシールを通過する泥水の量を抑制すると共に、ラビリンスシールを通過した泥水がシールリップの摺接点に到達するのを防止することができる。 According to the sealing device of the present invention configured as described above, the intrusion of foreign matter such as mud water into the sealed space of the combined seal ring, which exists between the outer diameter side seal ring and the inner diameter side seal ring, is effective. Can be prevented. That is, in the case of the combined seal ring which is the sealing device of the present invention, the labyrinth seal is provided on the outer space side of the sealed space existing between the outer diameter side seal ring and the inner diameter side seal ring. The amount of foreign material (splash) that passes through and enters the sealed space from the outside space can be minimized. Since the width of the labyrinth gap can be narrowed by the elastic material labyrinth slip, the amount of foreign matter passing through the labyrinth seal can be minimized. As a result, the sealing device of the present invention can obtain good sealing performance over a long period of time, and the durability of the sealing hub unit bearing equipped with this sealing device can be ensured.
In addition, when removing the inner diameter side seal ring that has been vulcanized and formed in the process of manufacturing the inner diameter side seal ring from the molding die, the portion between the seal lip and the labyrin slip needs to deform and pull out the labyrin slip. There is (so-called unreasonable). In the present invention, in the portion between the first seal lip and the labyrinth slip of the inner diameter side seal ring, the minimum outer diameter of the seal member of the portion covering the outer diameter surface of the inner diameter side annular portion and the outside of the inner diameter side annular portion The diameter and thickness are set to be equal to or greater than the thickness of the proximal end of the labyrinth slip. Therefore, even in the case of forced removal, the seal member can be firmly fixed. Furthermore, according to the present invention, the axially outer side surface of the labyrin slip is provided with a seal recess which is recessed inward in the axial direction at a position smaller in diameter than the proximal end of the labyrin slip. Therefore, the labyrinth slip can be easily deformed at the time of forced removal.
Further, the labyrinth gap of the labyrinth seal is provided equal to or less than the thickness of the tip portion of the first seal lip of the inner diameter side seal ring. Therefore, the amount of muddy water passing through the labyrinth seal can be suppressed, and muddy water passing through the labyrinth seal can be prevented from reaching the sliding contact of the seal lip.

第１実施形態を示す、組み合わせシールリングの断面図（自由状態）。Sectional drawing (free state) of the combination seal ring which shows 1st Embodiment. 内径側シールリングの製造方法を説明する金型の断面図。Sectional drawing of the metal mold | die explaining the manufacturing method of the inner diameter side seal ring. 図１を、シールリップが芯金に摺接した状態を示す断面図。FIG. 2 is a cross-sectional view showing a state in which the seal lip is in sliding contact with the core metal in FIG. 第２実施形態を示す、組み合わせシールリングの断面図。Sectional drawing of a combination seal ring which shows 2nd Embodiment. 従来構造の１例を示す、密封装置付ハブユニット軸受の断面図。Sectional drawing of the hub unit bearing with a sealing device which shows one example of the conventional structure. 従来構造の１例を示す、組み合わせシールリングの断面図。Sectional drawing of a combination seal ring which shows one example of conventional structure.

［第１実施形態］
図１は、本発明の第１実施形態を示している。本実施形態を含めて本発明の密封装置である組み合わせシールリング１０ａ、及び密封装置付ハブユニット軸受の特徴は、ラビリンスリップ３１及びグリースリップ３２を設ける事により、組み合わせシールリング１０ａのシール性能を長期間に亙って良好に保ち、密封装置付ハブユニット軸受の耐久性を向上する構造にある。その他の部分の構成及び作用に就いては、前述の図５，６に示した組み合わせシールリング１０及び密封装置付ハブユニット軸受１と同様であるから、重複する図示並びに説明は省略若しくは簡略にし、以下、本例の特徴部分を中心に説明する。
尚、本実施形態の組み合わせシールリング１０ａは、図１〜４の左側（外径側円輪部１８の側）を内部空間８と隣接させた状態で密封装置付ハブユニット軸受に装着される。従って、本明細書及び請求項に於いては、軸方向に関して、図１〜４の左側を内部側と言う。反対に、異物が存在する外部空間側となる図１〜４の右側（内径側円輪部２３ａの側）を、外部側と言う。 First Embodiment
FIG. 1 shows a first embodiment of the present invention. The features of the combined seal ring 10a and the hub unit bearing with the sealed device according to the present invention including the present embodiment are the sealing performance of the combined seal ring 10a by providing the labyrin slip 31 and the grease lip 32. It is a structure which keeps good over time and improves the durability of the hub unit bearing with a sealing device. The configuration and operation of the other parts are the same as those of the combination seal ring 10 and the hub unit bearing 1 with a sealing device shown in FIGS. 5 and 6 described above, and therefore redundant illustration and description will be omitted or simplified, Hereinafter, the characteristic part of this example will be mainly described.
The combined seal ring 10a of the present embodiment is mounted on the hub unit bearing with a sealing device in a state where the left side (the outer diameter side annular portion 18 side) of FIGS. Therefore, in the present specification and claims, the left side of FIGS. 1 to 4 is referred to as the inner side with respect to the axial direction. On the other hand, the right side (the side of the inner diameter side annular ring portion 23 a) in FIGS. 1 to 4, which is the outer space side where the foreign matter is present, is referred to as the outer side.

本実施形態の組み合わせシールリング１０ａは、１対のシールリングである、外径側シールリング１４ａと内径側シールリング１５ａとを組み合わせて、断面矩形で全体を円環状に構成している。外径側シールリング１４ａは、外径側芯金１６とシール部材１９ａとを備えている。外径側芯金１６は、軟鋼板等の金属板を折り曲げる事により、断面Ｌ字形で全体を円環状に形成しており、円筒形状である外径側円筒部１７と、外径側円筒部の軸方向内部側の端縁（図１の左側の縁）から径方向内側に延びる外径側円輪部１８とから成る。シール材１９ａは、ゴムの如き弾性材製で、外径側円輪部１８に対して全周に亙って加硫成形されており、外径側円輪部１８の内周縁にシールリップ２０ｃとグリースリップ３２とを有し、外径側円輪部１８の外周縁にシール凸条３３を有している。グリースリップ３２は、各シールリップ２０ａ，２０ｂ，２０ｃのうちで最も内部空間８寄りに位置するシールリップ２０ｃよりも、さらに軸方向内部側（内部空間８側）に位置している。   The combined seal ring 10a according to the present embodiment is formed as a whole in an annular shape with a rectangular cross section by combining the outer diameter side seal ring 14a and the inner diameter side seal ring 15a, which are a pair of seal rings. The outer diameter side seal ring 14 a includes an outer diameter side core metal 16 and a seal member 19 a. The outer diameter side core metal 16 is formed by bending the metal plate such as a mild steel plate so that the whole is formed in an annular shape with an L-shaped cross section, and the outer diameter side cylindrical portion 17 having a cylindrical shape and the outer diameter side cylindrical portion And an radially outer ring portion 18 extending radially inward from an edge on the axially inner side (the left edge of FIG. 1). The seal material 19 a is made of an elastic material such as rubber, and is formed by vulcanization over the entire circumference of the outer diameter side annular portion 18, and the seal lip 20 c is formed on the inner peripheral edge of the outer diameter side circular portion 18. And a grease lip 32 and has a seal ridge 33 on the outer peripheral edge of the outer diameter side annular portion 18. The grease lip 32 is located on the axially inner side (the inner space 8 side) further than the seal lip 20c located closest to the inner space 8 among the seal lips 20a, 20b, 20c.

内径側シールリング１５ａは、内径側芯金２１ａとシール部材２４ａとを備えている。内径側芯金２１ａは、軟鋼板等の金属板を折り曲げる事により、断面Ｌ字形で全体を円環状に形成しており、円筒形状である内径側円筒部２２と、内径側円筒部の軸方向外部側の端縁（図１の右側の縁）から径方向外側に延びる内径側円輪部２３ａとから成る。内径側円輪部２３ａの外径寄り部分には、軸方向内部側に凹ませた、円輪状の芯金凹部３０を形成している。シール材２４ａは、ゴムの如き弾性材製で、芯金凹部３０に対して全周に亙って加硫成形されており、芯金凹部３０の軸方向内部側面にシールリップ２０ｂを有し、芯金凹部３０の外周縁にシールリップ２０ａ及びラビリンスリップ３１を有している。ラビリンスリップ３１は、各シールリップ２０ａ，２０ｂ，２０ｃのうちで最も外部空間寄りに位置するシールリップ２０ａよりも、さらに軸方向外部側（外部空間側）に位置している。   The inner diameter side seal ring 15a includes an inner diameter side metal core 21a and a seal member 24a. The inner diameter side core metal 21a is formed by bending the metal plate such as a mild steel plate so that the whole is L-shaped in an annular shape, and the inner diameter side cylindrical portion 22 which is cylindrical and the axial direction of the inner diameter side cylindrical portion It comprises an inner diameter side annular portion 23a extending radially outward from the outer end edge (the right edge in FIG. 1). A ring-shaped cored metal core recess 30 is formed on the radially inner side of the inner diameter side annular portion 23a, and is recessed inward in the axial direction. The seal member 24 a is made of an elastic material such as rubber, and is formed by vulcanization over the entire circumference of the core metal recess 30, and has a seal lip 20 b on the axially inner side surface of the core metal recess 30. A seal lip 20 a and a labyrinth slip 31 are provided on the outer peripheral edge of the core metal recess 30. The labyrinth slip 31 is located further on the axially outer side (external space side) than the seal lip 20a located closest to the outer space among the seal lips 20a, 20b, 20c.

外径側シールリング１４ａと内径側シールリング１５ａとを組み合わせた状態では、外径側シールリング１４ａを構成するシールリップ２０ｃ及びグリースリップ３２の先端部が、内径側芯金２１ａを構成する内径側円筒部２２の外周面に、全周に亙って摺接する。一方、内径側シールリング１５ａを構成するシールリップ２０ａ，２０ｂの先端部が、外径側芯金１６を構成する外径側円筒部１７の内周面及び外径側円輪部１８の軸方向内部側面に、それぞれ全周に亙って摺接する。更に、ラビリンスリップ３１の先端部が、外径側円筒部１７の軸方向外部側の端部内周面に対して径方向に近接対向して、軸方向のラビリンスシール３４を形成している。尚、図１は、各シールリップ２０ａ，２０ｂ，２０ｃ及びグリースリップ３２の自由状態での形状を示している。   In the state where the outer diameter side seal ring 14a and the inner diameter side seal ring 15a are combined, the tips of the seal lip 20c and the grease lip 32 which constitute the outer diameter side seal ring 14a are the inner diameter side which constitutes the inner diameter side metal core 21a. The outer peripheral surface of the cylindrical portion 22 is in sliding contact with the entire circumference. On the other hand, the tip portions of the seal lips 20 a and 20 b constituting the inner diameter side seal ring 15 a are the inner peripheral surface of the outer diameter side cylindrical portion 17 constituting the outer diameter side metal core 16 and the axial direction of the outer diameter side annular portion 18 Each side is in sliding contact with the inner side. Further, the tip end of the labyrinth slip 31 faces the radial inner peripheral surface of the end portion on the axially outer side of the outer diameter side cylindrical portion 17 in the radial direction so as to face each other to form the labyrinth seal 34 in the axial direction. FIG. 1 shows the shapes of the seal lips 20a, 20b, 20c and the grease lip 32 in a free state.

組み合わせシールリング１０ａは、前述した図５に示した密封装置付ハブユニット１の開口部を塞ぐ密封装置として、内部空間８の端部開口（図５の右側の開口部）に装着される。具体的には、外輪２の軸方向端部の内周面に外径側シールリング１４ａを構成する外径側円筒部１７を内嵌固定し、ハブ３の軸方向端部の外周面に内径側シールリング１５ａを構成する内径側円筒部２２を外嵌固定している。更に、外径側円輪部１８の外周部に設けられたシール凸部３３は、外径側円筒部１７の外周面よりも径方向外側に突出しており、外輪２の内周面に、全周に亙って弾性変形した状態で当接する。これにより、外輪２と外径側円筒部１７との嵌合面（金属嵌合）から、泥水等の異物が内部空間８に侵入する事を防止している。   The combination seal ring 10a is mounted to the end opening (the opening on the right side of FIG. 5) of the internal space 8 as a sealing device for closing the opening of the hub unit 1 with a sealing device shown in FIG. 5 described above. Specifically, the outer diameter side cylindrical portion 17 constituting the outer diameter side seal ring 14 a is fitted and fixed to the inner peripheral surface of the axial direction end of the outer ring 2, and the inner diameter is formed on the outer peripheral surface of the axial end of the hub 3 The inner diameter side cylindrical part 22 which comprises the side seal ring 15a is externally fitted and fixed. Furthermore, the seal convex portion 33 provided on the outer peripheral portion of the outer diameter side circular ring portion 18 protrudes radially outward with respect to the outer peripheral surface of the outer diameter side cylindrical portion 17. Abuts in an elastically deformed state over the circumference. Thus, foreign matter such as muddy water is prevented from entering the internal space 8 from the fitting surface (metal fitting) between the outer ring 2 and the outer diameter side cylindrical portion 17.

図２は、内径側シールリング１５ａを製造する工程に於いて、内径側芯金２１ａにシール部材２４ａを加硫成形する金型を示している。シール部材２４ａを加硫成形する成形金型は、上型４０と下型４１とを組み合わせる事により構成されており、内径側芯金２１ａをキャビティ４２内にセットした状態で、シールリップ２０ａ，２０ｂ及びラビリンスリップ３１を内径側芯金２１ａに加硫接着している。
加硫成形が完了した内径側シールリング１５ａを成形金型から取り出す場合、上型４０のうちで、シールリップ２０ａとラビリンスリップ３１との間にある部分は、ラビリンスリップ３１を変形させて引き抜く必要がある（所謂無理抜き）。従って、シール部材２４ａを強固に芯金凹部３０に接着固定する為、シールリップ２０ａとラビリンスリップ３１の間の最小径部分と、内径側円輪部２３ａ（芯金凹部３０）の外径との厚さＴ２４を、ラビリンスリップ３１の基端部の厚さＴ３１以上としている（Ｔ２４≧Ｔ３１）。更に、無理抜き時にラビリンスリップ３１が変形容易とする為に、ラビリンスリップ３１の軸方向外部側面で、基端部よりも若干小径となる位置に、軸方向内部側に凹んだシール凹部３５を設けている。 FIG. 2 shows a mold for vulcanizing and forming the seal member 24a on the inner diameter side metal core 21a in the process of manufacturing the inner diameter side seal ring 15a. The molding die for vulcanizing and forming the seal member 24a is configured by combining the upper die 40 and the lower die 41, and with the inner diameter side metal core 21a set in the cavity 42, the seal lip 20a, 20b And, the labyrin slip 31 is adhered by vulcanization to the inner diameter side metal core 21 a.
When removing the inner diameter side seal ring 15a after completion of vulcanization forming from the molding die, it is necessary to deform the labyrin slip 31 and pull out a portion of the upper die 40 between the seal lip 20a and the labyrin slip 31 There is (so-called unreasonable). Therefore, in order to firmly bond and seal the seal member 24a to the core metal recess 30, the minimum diameter portion between the seal lip 20a and the labyrin slip 31 and the outer diameter of the inner diameter side circular ring portion 23a (core metal recess 30) The thickness T24 is equal to or greater than the thickness T31 of the proximal end of the labyrinth slip 31 (T2424T31). Furthermore, in order to facilitate deformation of the labyrinth slip 31 at the time of forced removal, the axially outer side of the labyrinth slip 31 is provided with a seal recess 35 recessed on the axially inner side at a position slightly smaller in diameter than the base end. ing.

又、内径側円輪部２３ａ（芯金凹部３０）の外径縁は、金属板をプレス加工により成形する際のブランキング時のせん断面及び破断面であり、加硫接着剤の載りが悪く、成形ゴム材を接着固定できない。本実施形態では、内径側円輪部２３ａの外径側を軸方向内部側に凹ませた芯金凹部３０を設け、この芯金凹部３０の軸方向両側面にラビリンスリップ３１の根元部分を強固に接着固定しているため、前述したラビリンスリップ３１の無理抜きを容易にしている。
尚、内径側円輪部２３ａの内径側部分と、外径側円筒部１７の軸方向外部側の端面と、ラビリンスリップ３１の軸方向外部側面とは、同一面上に位置している。本構成により、組み合わせシールリング１０ａを密封装置付ハブユニット軸受に装着する際、内径側芯金２１ａと外径側芯金１６とを同時に押して、１度の圧入工程により組み合わせシールリング１０ａを位置決め可能としている。 Further, the outer diameter edge of the inner diameter side annular portion 23a (core metal recess 30) is a sheared surface and a fractured surface at the time of blanking when forming a metal plate by press work, and the mounting of the vulcanized adhesive is bad. , Can not adhesively fix molded rubber material. In the present embodiment, a core metal recess 30 is provided in which the outer diameter side of the inner diameter side annular portion 23a is recessed inward in the axial direction, and the root portion of the labyrin slip 31 is firmly fixed on both axial sides of the core metal recess 30. Since the adhesive is fixed to the above, the above-described forced removal of the labyrinth slip 31 is facilitated.
The inner diameter side portion of the inner diameter side annular ring portion 23a, the end surface on the outer side in the axial direction of the outer diameter side cylindrical portion 17, and the outer side surface in the axial direction of the labyrin slip 31 are located on the same plane. With this configuration, when mounting the combined seal ring 10a on the hub unit bearing with a sealing device, the inner diameter side cored bar 21a and the outer diameter side cored bar 16 can be pressed simultaneously, and the combination seal ring 10a can be positioned by one press fitting process. And

図３は、各シールリング１４ａ，１５ａを組み合わせた状態に於いて、各シールリップ２０ａ，２０ｂ，２０ｃ及びグリースリップ３２が変形した（摺接面に接触した）状態を示している。シールリップ２０ａは、スプラッシュの水圧によりシールリップ２０ａの緊迫力が高まる断面Ｕ字状のシールリップ形態であり、単純にラビリンスリップを設けてしまうとシールリップ２０ａに水圧が掛からないままに摺接点に泥水が到達する状態となる為、逆に耐泥水性能が低下してしまう場合がある。本実施形態では、シールリップ２０ａには水圧が掛からない事を前提として、ラビリンスシール３４を通過する泥水の量を抑制すると共に、ラビリンスシール３４を通過した泥水がシールリップ２０ａの摺接点に到達するのを防止している。具体的には、ラビリンスシール３４の径方向隙間Ｌ３４を、シールリップ２０ａの先端部の厚さＴ２０ａ以下（Ｌ３４≦Ｔ２０ａ）としており、好ましくはシールリップ２０ａの先端部の厚さの１／２以下（Ｌ３４≦（Ｔ２０ａ／２））とする。更に、ラビリンスリップ３１の先端部の軸方向内部側面と、摺接状態のルールリップ２０ａの摺接点との軸方向距離Ｌ１を、十分に確保している（例えは、Ｌ１≧（Ｌ３４×５））。   FIG. 3 shows a state in which the seal lips 20a, 20b, 20c and the grease lip 32 are deformed (in contact with the sliding contact surface) in the state where the seal rings 14a, 15a are combined. The seal lip 20a is a U-shaped seal lip in which the pressure force of the seal lip 20a is increased by the water pressure of the splash, and if a labyrinth slip is simply provided, the seal lip 20a does not receive water pressure. Since mud water reaches a state, mud water resistance performance may fall conversely. In the present embodiment, the amount of muddy water passing through the labyrinth seal 34 is suppressed on the premise that water pressure is not applied to the seal lip 20a, and the muddy water passing through the labyrinth seal 34 reaches the sliding contacts of the seal lip 20a. To prevent. Specifically, the radial gap L34 of the labyrinth seal 34 is equal to or less than the thickness T20a (L34 ≦ T20a) of the tip of the seal lip 20a, preferably 1/2 or less of the thickness of the tip of the seal lip 20a. (L34 ≦ (T20a / 2)). Further, the axial distance L1 between the axially inner side surface of the tip of the labyrinth slip 31 and the sliding contact of the rule lip 20a in the sliding contact state is sufficiently ensured (for example, L1 ≧ (L34 × 5) ).

又、各シールリップ２０ａ，２０ｂ，２０ｃは、その先端部を外部空間側に向けた状態で摺接面を移動する外向きリップである為、内部空間８に封入されたグリースは、外部空間に漏洩し易い。本実施形態では、内径側円筒部２２に摺接するグリースリップ３２が、基端部を外径側円輪部１８の内径部に有して、先端部を径方向内側に向かうに従い軸方向内部側に延ばす内向きリップである。本構成により、グリースの漏洩を防止して、密封装置付ハブユニット軸受の耐久性を維持している。   In addition, since each seal lip 20a, 20b, 20c is an outward lip moving the sliding surface in a state where its tip is directed to the external space side, the grease enclosed in the internal space 8 is in the external space It is easy to leak. In the present embodiment, the grease lip 32 in sliding contact with the inner diameter side cylindrical portion 22 has the base end portion at the inner diameter portion of the outer diameter side circular ring portion 18 and the axially inner side as the tip end portion goes radially inward. It is an inward lip that extends to According to this configuration, the leakage of grease is prevented, and the durability of the hub unit bearing with a sealing device is maintained.

上述の様に構成する、本実施形態の組み合わせシールリング１０ａ、及び組み合わせシールリング１０ａを組み込んだ密封装置付ハブユニット軸受によれば、外径側シールリング１４ａと内径側シールリング１５ａとの間に存在する、密封空間２６への、泥水等の異物の侵入を効果的に防止できる。即ち、泥水等の異物が存在する外部空間と、最も外部空間側に設けられたシールリップ２０ａとの間に、ラビリンスシール３４を設ける事により、スプラッシュがシールリップ２０ａの摺接点まで到達するのを防止している。この為、ラビリンスシール３４を通過して、密封空間２６から内部空間８迄入り込む異物の量を僅少に抑えられる。   According to the combination seal ring 10a of the present embodiment and the hub unit bearing with the seal device incorporating the combination seal ring 10a configured as described above, between the outer diameter side seal ring 14a and the inner diameter side seal ring 15a It is possible to effectively prevent the entry of foreign matter such as mud into the sealed space 26 that is present. That is, by providing the labyrinth seal 34 between the external space in which foreign matter such as muddy water exists and the seal lip 20a provided closest to the external space, it is possible that the splash reaches the sliding contact of the seal lip 20a. It is preventing. Therefore, the amount of foreign matter which passes through the labyrinth seal 34 and enters the internal space 8 from the sealed space 26 can be slightly suppressed.

更に、ラビリンスシール３４は、弾性材製のラビリンスリップ３１の先端部を相手面に近接対向させており、仮に相手面と軽く擦れ合っても、自身及び相手面に著しい損傷を与える事はない。従って、ラビリンス隙間Ｌ３４の幅を狭くして、ラビリンスシール３４を通過する異物の量を僅少に抑え、長期間に亙り良好なシール性能を得られる。   Furthermore, the labyrinth seal 34 has the tip of the labyrinth slip 31 made of an elastic material close to and opposed to the mating surface, and even if it slightly rubs against the mating surface, it does not significantly damage itself or the mating surface. Therefore, the width of the labyrinth gap L34 is narrowed to slightly suppress the amount of foreign matter passing through the labyrinth seal 34, and good seal performance can be obtained over a long period of time.

［第２実施形態］
図４は、本発明の第２実施形態を示している。本実施形態の組み合わせシールリング１０ｂの場合、内径側シールリング１５ｂを構成する芯金凹部３０ａを、径方向外側に向かうに従い軸方向内部側に傾斜して延びる傾斜面とし、この芯金凹部３０ａに、ラビリンスリップ３１ａの根元部を加硫接着している。
又、ラビリンスリップ３１ａの先端面を、外径側円筒部１７の軸方向外部側の端部内周面に形成した面取りと近接対向する傾斜面として、傾斜したラビリンス隙間Ｌ３４ａを有するラビリンスシール３４ａを形成している。本構成により、ラビリンスシール３４ａを通過した泥水等の異物が、シールリップ２０ａの摺接点に到達するのを効果的に防止している。
その他の構成及び作用効果は、前述した第１実施形態と同様である。 Second Embodiment
FIG. 4 shows a second embodiment of the present invention. In the case of the combined seal ring 10b of the present embodiment, the cored metal recess 30a constituting the inner diameter side seal ring 15b is an inclined surface extending inward in the axial direction as it goes radially outward, and the cored metal recess 30a The root portion of the labyrinth slip 31a is bonded by vulcanization.
Also, a labyrinth seal 34a having a labyrinth clearance L34a inclined is formed as an inclined surface facing the chamfer formed on the outer peripheral side end of the outer diameter side cylindrical portion 17 close to the chamfer formed on the end outer surface of the outer diameter side cylindrical portion 17a. doing. This configuration effectively prevents foreign matter such as muddy water that has passed through the labyrinth seal 34a from reaching the sliding contacts of the seal lip 20a.
The other configurations and effects are the same as those of the first embodiment described above.

本発明は、軸受ユニットの内部空間の端部開口を塞ぐ密封装置として、好適に実施できる。又、本発明の密封装置を装着した、密封装置付ハブユニット軸受は、自動車の車輪を懸架装置に対して支持する為の車輪支持用軸受ユニットとして実施する事が、その作用・効果を十分に得る面から好ましい。
尚、上述した第１及び第２実施形態の各個別の構成は、相互に置き換えて利用可能である。 The present invention can be suitably implemented as a sealing device for closing the end opening of the internal space of the bearing unit. In addition, the hub unit bearing equipped with the sealing device according to the present invention is sufficiently implemented as a wheel support bearing unit for supporting the wheel of an automobile with respect to a suspension system, and thus the operation and effect are sufficiently achieved. It is preferable from the aspect of obtaining.
The individual configurations of the first and second embodiments described above can be used interchangeably.

１ 密封装置付ハブユニット軸受
２ 外輪
３ ハブ
４ 外輪軌道
５ 内輪軌道
６ 玉
７ 回転フランジ
８ 内部空間
９ シールリング
１０、１０ａ、１０ｂ 組み合わせシールリング
１１ 芯金
１２ シール部材
１３ シールリップ
１４、１４ａ 外径側シールリング
１５、１５ａ、１５ｂ 内径側シールリング
１６ 外径側芯金
１７ 外径側円筒部
１８ 外径側円輪部
１９、１９ａ シール部材
２０ａ、２０ｂ、２０ｃ シールリップ
２１，２１ａ，２１ｂ 内径側芯金
２２ 内径側円筒部
２３，２３ａ，２３ｂ 内径側円輪部
２４，２４ａ，２４ｂ シール材
２５ エンコーダ
２６ 密封空間
３０，３０ａ 芯金凹部
３１，３１ａ ラビリンスリップ
３２ グリースリップ
３３ シール凸条
３４，３４ａ ラビリンスシール
３５ シール凹部
４０ 上型
４１ 下型
４２ キャビティ Reference Signs List 1 hub unit bearing with sealing device 2 outer ring 3 hub 4 outer ring raceway 5 inner ring raceway 6 ball 7 rotating flange 8 inner space 9 seal ring 10, 10a, 10b combination seal ring 11 core metal 12 seal member 13 seal lip 14 14a outer diameter Side seal ring 15, 15a, 15b Inner diameter side seal ring 16 Outer diameter side core metal 17 Outer diameter side cylindrical portion 18 Outer diameter side annular portion 19, 19a Seal members 20a, 20b, 20c Seal lip 21, 21a, 21b Inner diameter side Core metal 22 Inner diameter side cylindrical portion 23, 23a, 23b Inner diameter side annular portion 24, 24a, 24b Sealing material 25 Encoder 26 Sealed space 30, 30a Core metal recessed portion 31, 31a Labyrinth slip 32 Grease lip 33 Sealed ridge 34, 34a Labyrinth seal 35 Seal recess 40 Upper mold 41 Lower mold 42 cavity

Claims (3)

外径側シールリングと内径側シールリングとを組み合わせて成り、
前記外径側シールリングは、外径側芯金とシールリップとを備え、全体を円環状に構成された前記外径側芯金は、外径側円筒部と、前記外径側円筒部の軸方向端縁から径方向内側に延びる外径側円輪部とから成り、
前記内径側シールリングは、内径側芯金とシール部材とを備え、全体を円環状に構成された前記内径側芯金は、内径側円筒部と、前記内径側円筒部の軸方向端縁から径方向外側に延びる内径側円輪部とから成り、前記シール部材は、第１シールリップと、第２シールリップと、ラビリンスリップとを有し、
前記外径側シールリングのシールリップが、前記内径側円筒部に摺接しており、前記内径側シールリングの第１シールリップが、前記外径側円筒部に摺接し、前記内径側シールリングの第２シールリップが、前記外径側円輪部に摺接している密封装置であって、
前記外径側円輪部の内周縁にグリースリップを設け、前記グリースリップの先端部は、径方向内側に向かうに従い軸方向内部側に延びた状態で、前記内径側円筒部に対して全周に亙って摺接しており、
前記内径側円輪部の外周縁に前記ラビリンスリップを設け、前記ラビリンスリップの先端部は、前記外径側円筒部の軸方向外部側の内周面に対して全周に亙って近接対向して、ラビリンスシールを形成し、
前記内径側シールリングの第１シールリップと前記ラビリンスリップとの間の部分において前記内径側円輪部の外径面を覆う部分の前記シール部材の最小外径と、前記内径側円輪部の外径との厚さを、前記ラビリンスリップの基端部の厚さ以上に設け、
前記ラビリンスリップの軸方向外部側面において前記ラビリンスリップの基端部よりも小径となる部分に、軸方向内部側に凹むシール凹部を設け、
前記ラビリンスシールのラビリンス隙間を、前記内径側シールリングの第１シールリップの先端部の厚さ以下に設けている事を特徴とする密封装置。 Consists of a combination of an outer diameter seal ring and an inner diameter seal ring,
The outer diameter side seal ring includes an outer diameter side cored bar and a seal lip, and the outer diameter side cored bar formed in an annular shape as a whole comprises an outer diameter side cylindrical portion and an outer diameter side cylindrical portion. An outer diameter side annular portion extending radially inward from an axial end edge;
The inner diameter side seal ring is provided with an inner diameter side core metal and a seal member , and the entire inner diameter side core metal formed in an annular shape is formed from an inner diameter side cylindrical portion and an axial end edge of the inner diameter side cylindrical portion. consists inner diameter side annular portion extending radially outward, said seal member includes a first seal lip and a second sealing lip, and a labyrinth lip,
The seal lip of the outer diameter side seal ring is in sliding contact with the inner diameter side cylindrical portion, and the first seal lip of the inner diameter side seal ring is in sliding contact with the outer diameter side cylindrical portion . A sealing device in which a second seal lip is in sliding contact with the outer diameter side annular portion,
A grease lip is provided on the inner peripheral edge of the outer diameter side annular portion, and the tip end of the grease lip extends all the way to the inner diameter side cylindrical portion in the state of extending axially inward as it goes radially inward. It is in sliding contact with the
The labyrinth lip provided on the outer peripheral edge of the inner diameter side annular portion, the tip portion of the labyrinth lip is closely opposed the outer to the inner circumferential surface of the axial outer side of the diameter cylindrical portion over the entire periphery Form a labyrinth seal ,
In the portion between the first seal lip of the inner diameter side seal ring and the labyrinth slip, the minimum outer diameter of the seal member of the portion covering the outer diameter surface of the inner diameter side annular portion and the inner diameter side annular portion The thickness of the outer diameter and the thickness of the proximal end portion of the labyrinth slip are provided,
An axially outer side surface of the labyrinth slip is provided with a seal recess which is recessed inwardly in the axial direction at a portion smaller in diameter than the proximal end of the labyrinth slip,
A sealing device characterized in that a labyrinth gap of the labyrinth seal is provided equal to or less than a thickness of a tip portion of a first seal lip of the inner diameter side seal ring . 前記ラビリンスリップの先端面を傾斜面に設けて、前記ラビリンス隙間を傾斜して形成している、請求項１に記載した密封装置。The sealing device according to claim 1, wherein a tip surface of the labyrinth slip is provided on an inclined surface, and the labyrinth gap is formed to be inclined. 内周面に外輪軌道を有する外輪と、外周面に内輪軌道を有するハブと、前記外輪軌道と前記内輪軌道との間に転動自在に設けられた複数の転動体と、前記転動体を設置した内部空間の端部開口を塞ぐ組み合わせシールリングとを備え、
前記組み合わせシールリングが、請求項１〜２のうちの何れか１項に記載した密封装置である密封装置付ハブユニット軸受。 An outer ring having an outer ring raceway on an inner peripheral surface, a hub having an inner ring raceway on an outer peripheral surface, a plurality of rolling elements rollably provided between the outer ring raceway and the inner ring track, and the rolling elements installed And a combination seal ring for closing the end opening of the internal space,
A hub unit bearing with a sealing device, wherein the combined seal ring is the sealing device according to any one of claims 1 to 2.
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