JP2010096217A - Rolling bearing device - Google Patents

Rolling bearing device Download PDF

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JP2010096217A
JP2010096217A JP2008265540A JP2008265540A JP2010096217A JP 2010096217 A JP2010096217 A JP 2010096217A JP 2008265540 A JP2008265540 A JP 2008265540A JP 2008265540 A JP2008265540 A JP 2008265540A JP 2010096217 A JP2010096217 A JP 2010096217A
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labyrinth
outer ring
axial direction
portions
rolling bearing
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Tatsuya Yokota
竜哉 横田
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JTEKT Corp
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JTEKT Corp
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Priority to JP2008265540A priority Critical patent/JP2010096217A/en
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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
    • F16C33/80—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
    • 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
    • F16C33/7873—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 single sealing ring of generally L-shaped cross-section
    • F16C33/7876—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 single sealing ring of generally L-shaped cross-section 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device wherein foreign matters hardly enter into portions of a rolling bearing. <P>SOLUTION: In a clearance between an end face portion of an outer ring 1 on the vehicle outer side of a hub unit 101 as one example of the rolling bearing device and a wall face portion 25 of a hub wheel 4 opposed to the end face portion in an axial direction A, first and third labyrinth portions 36, 39 are formed in a radial direction R at different positions in the axial direction A. These are connected to each other via a second labyrinth portion 37 which is formed in the axial direction A. Foreign matters cannot enter into the portions of the rolling bearing without passing through the fist-third labyrinth portions 36, 37, 39. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、転がり軸受装置に関するものである。   The present invention relates to a rolling bearing device.

本明細書では、転がり軸受装置の一例である車両用のハブユニットについて説明する。車両（例えば、自動車）には、タイヤホイールやブレーキディスクを取り付けるためのハブユニットが使用されている。図１に示されるように、ハブユニット１００は、車体側に固定される外輪８１と、外輪８１と同心に配置されるハブホイール８２（内輪）と、これら外輪８１とハブホイール８２との間に介装される玉８３（転動体）とを備えており、ハブホイール８２が軸線ＣＬ周りに回転自在とされている。そして、このハブホイール８２に図示しない車輪（タイヤ）が取り付けられる。   This specification demonstrates the hub unit for vehicles which is an example of a rolling bearing apparatus. A hub unit for attaching a tire wheel and a brake disk is used in a vehicle (for example, an automobile). As shown in FIG. 1, the hub unit 100 includes an outer ring 81 fixed to the vehicle body side, a hub wheel 82 (inner ring) arranged concentrically with the outer ring 81, and between the outer ring 81 and the hub wheel 82. The ball 83 (rolling element) is provided, and the hub wheel 82 is rotatable around the axis line CL. A wheel (tire) (not shown) is attached to the hub wheel 82.

図８に示されるように、ハブユニット１００を構成する外輪８１とハブホイール８２との間には、回転抵抗を生じさせないように僅かな隙間８４が設けられていて、この隙間８４から、雨水や融雪剤を含む泥水等（以下、総称して「異物」と記載する。）が侵入する場合がある。これを防ぐため、外輪８１のアキシャル方向の端部に、密封部材８５が取り付けられている。しかし、侵入した異物により、密封部材８５が摩耗してしまうおそれがある。すると、転がり軸受の部分（例えば、転動面）に異物が侵入し、転がり軸受を損傷させてしまう。   As shown in FIG. 8, a slight gap 84 is provided between the outer ring 81 constituting the hub unit 100 and the hub wheel 82 so as not to cause rotational resistance. Muddy water or the like containing a snow melting agent (hereinafter collectively referred to as “foreign matter”) may enter. In order to prevent this, a sealing member 85 is attached to the end of the outer ring 81 in the axial direction. However, the sealing member 85 may be worn by the foreign matter that has entered. As a result, foreign matter enters the part of the rolling bearing (for example, the rolling surface) and damages the rolling bearing.

上記の問題を防ぐため、特許文献１に開示される技術が存している。しかし、この技術では、外輪とハブホイールとの隙間をラビリンス部として、異物を侵入しにくくしている。しかし、ラビリンス部を形成するために別部材（シールド板２８）を必要とする（特許文献１の図１の（Ｂ）又は図７の（Ｂ）を参照）。また、別部材を使用しない実施形態のラビリンス部には、屈曲部が１箇所しか形成されていないため、異物の侵入を阻止する機能はそれほど高くない（特許文献１の図９の（Ｂ）を参照）。
特開２００５−１４７２９８号公報 In order to prevent the above problem, a technique disclosed in Patent Document 1 exists. However, in this technique, the gap between the outer ring and the hub wheel is used as a labyrinth portion to make it difficult for foreign matter to enter. However, another member (shield plate 28) is required to form the labyrinth portion (see FIG. 1B or FIG. 7B of Patent Document 1). Moreover, since the labyrinth part of embodiment which does not use another member has only one bending part, the function which prevents the penetration | invasion of a foreign material is not so high ((B) of FIG. 9 of patent document 1). reference).
JP 2005-147298 A

本発明は、上記した事情に鑑み、転がり軸受装置における転がり軸受の部分に異物が侵入しにくくなるようにすることを課題としている。   This invention makes it a subject to make it difficult for a foreign material to penetrate | invade in the part of the rolling bearing in a rolling bearing apparatus in view of the above situation.

課題を解決するための手段及び発明の効果Means for Solving the Problems and Effects of the Invention

上記課題を達成するための本発明は、
筒状の外輪と、該外輪と同心に配置される内輪と、前記外輪と前記内輪との間に介装される転動体と、前記外輪と前記内輪との間から前記転動体の転動面に異物が侵入しないようにその開口を密封する密封部材とを備え、前記外輪と前記内輪がそれらの軸線周りに相対回転可能にされる転がり軸受装置であって、
前記密封部材は、前記外輪におけるアキシャル方向の端部に嵌合される芯金と、該芯金に被着されるシール部とを備え、前記シール部から突設されたリップ部が、前記内輪における前記外輪と対向する壁面部に接触することにより、前記外輪と前記内輪との間にラジアル方向に沿って形成された隙間を通って侵入する異物を阻止するようにされてなり、
前記外輪におけるアキシャル方向の端面部と、前記内輪における前記外輪の端面部と対向する壁面部との間に、アキシャル方向の異なる位置で、ラジアル方向に形成された少なくとも２つのラビリンス部を、アキシャル方向に形成された別のラビリンス部で連結したことを特徴としている。 The present invention for achieving the above-mentioned problems
A cylindrical outer ring, an inner ring disposed concentrically with the outer ring, a rolling element interposed between the outer ring and the inner ring, and a rolling surface of the rolling element between the outer ring and the inner ring A rolling bearing device that includes a sealing member that seals its opening so that foreign matter does not enter the outer ring, and the outer ring and the inner ring are relatively rotatable about their axes,
The sealing member includes a core metal fitted to an end portion of the outer ring in the axial direction, and a seal part attached to the core metal, and a lip part protruding from the seal part includes the inner ring In contact with the wall portion facing the outer ring in order to prevent foreign matter from entering through a gap formed along the radial direction between the outer ring and the inner ring,
At least two labyrinth portions formed in the radial direction at different positions in the axial direction between the end surface portion in the axial direction of the outer ring and the wall surface portion facing the end surface portion of the outer ring in the inner ring are arranged in the axial direction. It is characterized in that it is connected by another labyrinth part formed in the above.

本発明に係る転がり軸受装置は、上記したように構成されていて、外輪におけるアキシャル方向の端面部と、内輪における外輪の端面部と対向する壁面部との隙間にラビリンス部を形成している。このラビリンス部には、２箇所に屈曲部が設けられている。このため、ラビリンス部に侵入した異物は屈曲部で堆積し、それ以上侵入しにくくなる。ラジアル方向に形成されるラビリンス部は、２つ以上あってもよい。   The rolling bearing device according to the present invention is configured as described above, and forms a labyrinth portion in a gap between an axial end surface portion of the outer ring and a wall surface portion of the inner ring facing the end surface portion of the outer ring. The labyrinth portion is provided with bent portions at two locations. For this reason, the foreign matter that has entered the labyrinth portion accumulates at the bent portion, and does not easily enter further. There may be two or more labyrinth portions formed in the radial direction.

前記ラジアル方向の各ラビリンス部は、ラジアル方向に対して所定の角度で傾斜して設けられ、それらの角度はいずれも、前記別のラビリンス部とラジアル方向とがなす角度よりも小とすることが望ましい。   Each labyrinth portion in the radial direction is provided to be inclined at a predetermined angle with respect to the radial direction, and any of these angles may be smaller than an angle formed by the other labyrinth portion and the radial direction. desirable.

アキシャル方向に形成される別のラビリンス部が、ラジアル方向のラビリンス部よりも、よりアキシャル方向に沿わせて形成される。これにより、ラジアル方向のラビリンス部を通過した異物が、アキシャル方向に形成された別のラビリンス部に侵入しにくくなり、異物がラビリンス部を通過することを効果的に防止できる。   Another labyrinth portion formed in the axial direction is formed along the axial direction more than the labyrinth portion in the radial direction. This makes it difficult for foreign matter that has passed through the radial labyrinth portion to enter another labyrinth portion formed in the axial direction, and effectively prevents foreign matter from passing through the labyrinth portion.

前記ラジアル方向の各ラビリンス部は、アキシャル方向の同一位置に非連続状態で設けられた２本の第１ラビリンス部と、それらとアキシャル方向の異なる位置に設けられた第２ラビリンス部とを備え、前記各第１ラビリンス部の端部と前記第２ラビリンス部とを、アキシャル方向に形成された２本の別のラビリンス部で連結し、ラビリンス部の全体をクランク形状とすることができる。   Each of the labyrinth portions in the radial direction includes two first labyrinth portions provided in a discontinuous state at the same position in the axial direction, and a second labyrinth portion provided at a position different from the axial direction in the first labyrinth portion, The end of each said 1st labyrinth part and the said 2nd labyrinth part can be connected by two other labyrinth parts formed in the axial direction, and the whole labyrinth part can be made into a crank shape.

ラビリンス部の全体をクランク形状とすることにより、異物がラビリンス部を通過することを効果的に防止できる。   By making the whole labyrinth part into a crank shape, it is possible to effectively prevent foreign matters from passing through the labyrinth part.

本発明の実施例を説明する。図１は第１実施例のハブユニット１０１の全体図、図２は密封部材７の拡大図、図３は図２の要部の拡大図である。   Examples of the present invention will be described. 1 is an overall view of the hub unit 101 of the first embodiment, FIG. 2 is an enlarged view of a sealing member 7, and FIG. 3 is an enlarged view of a main part of FIG.

最初に、センサ付き転がり軸受装置の一例である車両用のハブユニット１０１の全体構成について説明する。図１に示されるように、第１実施例のハブユニット１０１は、外輪１と、この外輪１と同心に配置され、インナ側の外周面に内輪部材２が圧入されているとともに、軸部３が一体に組み付けられたハブホイール４（内輪）と、外輪１と内輪部材２又はハブホイール４との間に介装された玉５（転動体）と、それらのアキシャル方向の開口を密封する車両インナ側の密封部材６と車両アウタ側の密封部材７とを備えている。外輪１は、ボルト８により車体側部材であるナックル９に固定されていて、ハブホイール４が軸線ＣＬの周りに回転可能とされている。なお、図１において、図面視における左側は車両インナ側であり、同じく右側は車両アウタ側である。また、ラジアル方向を符号「Ｒ」で示し、アキシャル方向を符号「Ａ」で示す。   First, the overall configuration of a vehicle hub unit 101 which is an example of a sensor-equipped rolling bearing device will be described. As shown in FIG. 1, the hub unit 101 of the first embodiment is arranged concentrically with the outer ring 1 and the outer ring 1, and the inner ring member 2 is press-fitted into the outer peripheral surface on the inner side, and the shaft portion 3. Is a vehicle that seals the hub wheel 4 (inner ring) integrally assembled, the ball 5 (rolling element) interposed between the outer ring 1 and the inner ring member 2 or the hub wheel 4, and the axial opening thereof. An inner side sealing member 6 and a vehicle outer side sealing member 7 are provided. The outer ring 1 is fixed to a knuckle 9 that is a vehicle body side member by a bolt 8, and the hub wheel 4 is rotatable around an axis line CL. In FIG. 1, the left side in the drawing is the vehicle inner side, and the right side is the vehicle outer side. Further, the radial direction is indicated by a symbol “R”, and the axial direction is indicated by a symbol “A”.

最初に、ハブホイール４について説明する。ハブホイール４には、車輪やブレーキディスク（いずれも図示せず）を固定するためのハブフランジ１０がラジアル方向Ｒの外側に突出して設けられている。このハブフランジ１０の所定位置には、ハブボルト１１を挿通するためのボルト孔１０ａが形成されている。また、ハブフランジ１０における車両アウタ側の主表面には、ブレーキディスクロータ及びタイヤホイール（いずれも図示せず）を取り付ける際に位置決めの役割を果たすインロー部１２が、車両アウタ側に突出して形成されている。このインロー部１２により、ブレーキディスクロータ及びタイヤホイールの位置決めを行う。そして、ボルト孔１０ａに挿通されたハブボルト１１を締め込むことにより、ハブフランジ１０にブレーキディスクロータ及びタイヤホイールを固定する。   First, the hub wheel 4 will be described. A hub flange 10 for fixing a wheel and a brake disk (both not shown) is provided on the hub wheel 4 so as to protrude outward in the radial direction R. A bolt hole 10 a for inserting the hub bolt 11 is formed at a predetermined position of the hub flange 10. In addition, an inlay portion 12 that plays a role of positioning when attaching a brake disc rotor and a tire wheel (both not shown) is formed on the main surface of the hub flange 10 on the vehicle outer side so as to protrude toward the vehicle outer side. ing. The inlay portion 12 positions the brake disc rotor and the tire wheel. Then, the brake disc rotor and the tire wheel are fixed to the hub flange 10 by tightening the hub bolt 11 inserted through the bolt hole 10a.

内輪部材２及びハブホイール４には、多数個の玉５を転動自在に配置するための内輪側転動面１３，１４が形成されている。多数個の玉５は、冠形の保持器１５，１６によって周方向に一定間隔となるように保持されている。   The inner ring member 2 and the hub wheel 4 are formed with inner ring-side rolling surfaces 13 and 14 for disposing a large number of balls 5 in a freely rollable manner. A large number of balls 5 are held by the crown-shaped cages 15 and 16 at regular intervals in the circumferential direction.

次に、外輪１について説明する。外輪１は、炭素鋼を熱間鍛造して製造される。外輪１において、内輪側転動面１３，１４と対向する部分には、各外輪側転動面１７，１８が形成されている。保持器１５，１６によって周方向に一定間隔で配置された多数個の玉５は、各内輪側転動面１３，１４と外輪１の各外輪転動面１７，１８とによって転動自在に保持される。外輪１における車両インナ側の端部には、密封部材４を圧入して嵌合させるためのインナ側嵌合部１９が設けられている。同様に、外輪１における車両アウタ側の端部にも、密封部材４を圧入して嵌合させるためのアウタ側嵌合部２１が設けられている。   Next, the outer ring 1 will be described. The outer ring 1 is manufactured by hot forging carbon steel. In the outer ring 1, outer ring-side rolling surfaces 17 and 18 are formed at portions facing the inner ring-side rolling surfaces 13 and 14. A large number of balls 5 arranged at regular intervals in the circumferential direction by the cages 15 and 16 are held by the inner ring-side rolling surfaces 13 and 14 and the outer ring rolling surfaces 17 and 18 of the outer ring 1 so as to roll freely. Is done. An inner side fitting portion 19 for press-fitting and fitting the sealing member 4 is provided at the end of the outer ring 1 on the vehicle inner side. Similarly, an outer side fitting portion 21 for press-fitting the sealing member 4 into the outer ring 1 on the vehicle outer side is also provided.

そして、外輪１の外周面には、ラジアル方向Ｒの外側に突出する外輪フランジ部２２が形成されている。ハブユニット１０１は、外輪フランジ部２２のボルト孔（図示せず）に挿通されたボルト７により、ナックル８に固定される。   An outer ring flange portion 22 that protrudes outward in the radial direction R is formed on the outer circumferential surface of the outer ring 1. The hub unit 101 is fixed to the knuckle 8 by a bolt 7 inserted into a bolt hole (not shown) of the outer ring flange portion 22.

次に、密封部材６，７について説明する。図１に示されるように、外輪１とハブホイール４とが軸線ＣＬを同一にして取り付けられた状態において、外輪１のインナ側嵌合部１９とハブホイール４との間、及び外輪１のアウタ側嵌合部２１とハブホイール４との間には空間部が形成されていて、これらの空間部を密封する密封部材６，７が装着されている。密封部材６，７はリング状で、外輪１とハブホイール４との相対回転を許容した状態で空間部を密封している。   Next, the sealing members 6 and 7 will be described. As shown in FIG. 1, in a state where the outer ring 1 and the hub wheel 4 are attached with the same axis line CL, between the inner side fitting portion 19 of the outer ring 1 and the hub wheel 4, and the outer of the outer ring 1. Space portions are formed between the side fitting portion 21 and the hub wheel 4, and sealing members 6 and 7 for sealing these space portions are mounted. The sealing members 6 and 7 are ring-shaped, and seal the space in a state in which relative rotation between the outer ring 1 and the hub wheel 4 is allowed.

本明細書では、車両アウタ側の密封部材７について詳細に説明する。なお、車両インナ側の密封部材６についても殆ど同様である。図２に示されるように、密封部材７は、外輪１の内周面に嵌合されるリング状の芯金２３と、この芯金２３に被着されるシール部２４とを備えている。そして、シール部２４からハブホイール４の車両インナ側の壁面部２５に向かって突出する第１リップ部２６と、ハブホイール４の外周面２７に向かって突出する第２及び第３のリップ部２８，２９とが設けられている。第１ないし第３のリップ部２６，２８，２９は、ハブホイール４の壁面部２５又は外周面２７と接触している。これにより、異物がハブユニット１０１の転がり軸受の部分に侵入することが阻止されている。   In this specification, the vehicle outer side sealing member 7 will be described in detail. The same applies to the sealing member 6 on the vehicle inner side. As shown in FIG. 2, the sealing member 7 includes a ring-shaped cored bar 23 fitted to the inner peripheral surface of the outer ring 1 and a seal portion 24 attached to the cored bar 23. Then, a first lip portion 26 that protrudes from the seal portion 24 toward the wall surface portion 25 on the vehicle inner side of the hub wheel 4, and second and third lip portions 28 that protrude toward the outer peripheral surface 27 of the hub wheel 4. , 29 are provided. The first to third lip portions 26, 28, and 29 are in contact with the wall surface portion 25 or the outer peripheral surface 27 of the hub wheel 4. This prevents foreign matter from entering the rolling bearing portion of the hub unit 101.

図３に示されるように、外輪１における車両アウタ側嵌合部２１の端面は、ハブホイール４における車両インナ側の壁面部２５と僅かな隙間を介して対向配置されている。本実施例のハブユニット１０１における外輪１の車両アウタ側嵌合部２１の端面は、外輪１の外周面１ａから車両アウタ側嵌合部２１の厚みのほぼ１／３の部分にまで、外周面１ａとほぼ直角に設けられた第１端面部３１と、第１端面部３１におけるラジアル方向Ｒの内側の端部から、ラジアル方向Ｒに対して角度θでアキシャル方向Ａの車両インナ側に向かい、外輪１の外周面１ａから車両アウタ側嵌合部２１の厚みのほぼ２／３の部分にまで斜めに延設される第２端面部３２と、第２端面部３２におけるラジアル方向Ｒの内側の端部から、第１端面部３１と略平行に延設される第３端面部３３とを備えている。この第３端面部３３は、ハブホイール４の壁面部２５から短い距離ｅ（例えば、１ｍｍ程度）だけ離れた位置に、かつ壁面部２５と平行となるように形成されている。そして、ハブホイール４の車両インナ側の壁面部２５におけるラジアル方向Ｒの外周縁部には、外輪１の車両アウタ側嵌合部２１の第１及び第２の端面部３１，３２から距離ｅだけ離れて、かつそれらと平行となる第１及び第２の対向面部３４，３５が、ハブホイール４の壁面部２５と接続して連続的に形成されている。   As shown in FIG. 3, the end surface of the vehicle outer side fitting portion 21 in the outer ring 1 is disposed so as to face the wall surface portion 25 on the vehicle inner side in the hub wheel 4 through a slight gap. In the hub unit 101 of the present embodiment, the end surface of the vehicle outer side fitting portion 21 of the outer ring 1 extends from the outer peripheral surface 1a of the outer ring 1 to a portion that is approximately 1/3 of the thickness of the vehicle outer side fitting portion 21. A first end surface portion 31 provided substantially at right angles to 1a and an inner end portion in the radial direction R of the first end surface portion 31 toward the vehicle inner side in the axial direction A at an angle θ with respect to the radial direction R; A second end surface portion 32 extending obliquely from the outer peripheral surface 1a of the outer ring 1 to a portion of approximately 2/3 of the thickness of the vehicle outer side fitting portion 21, and an inner side of the second end surface portion 32 in the radial direction R. A third end surface portion 33 extending substantially in parallel with the first end surface portion 31 is provided from the end portion. The third end surface portion 33 is formed at a position separated from the wall surface portion 25 of the hub wheel 4 by a short distance e (for example, about 1 mm) and parallel to the wall surface portion 25. Then, the outer peripheral edge portion in the radial direction R of the wall surface portion 25 on the vehicle inner side of the hub wheel 4 is a distance e from the first and second end surface portions 31 and 32 of the vehicle outer side fitting portion 21 of the outer ring 1. The first and second opposing surface portions 34 and 35 that are separated from and parallel to the first and second opposing surface portions 34 and 35 are continuously formed in connection with the wall surface portion 25 of the hub wheel 4.

この結果、外輪１の第１端面部３１とハブホイール４の第１対向面部３４との間に、第１ラビリンス部３６がラジアル方向Ｒに沿って形成され、外輪１の第２端面部３２とハブホイール４の第２対向面部３５との間に、第１ラビリンス部３６と接続する第２ラビリンス部３７が、第１屈曲部３８を介して斜め下方に形成され、外輪１の第３端面部３３とハブホイール４の壁面部２５との間に、第２ラビリンス部３７と接続する第３ラビリンス部３９が、第２屈曲部４１を介してラジアル方向Ｒに沿って形成される。   As a result, a first labyrinth portion 36 is formed along the radial direction R between the first end surface portion 31 of the outer ring 1 and the first opposing surface portion 34 of the hub wheel 4, and the second end surface portion 32 of the outer ring 1 A second labyrinth portion 37 connected to the first labyrinth portion 36 is formed obliquely downward via the first bent portion 38 between the second facing surface portion 35 of the hub wheel 4 and the third end surface portion of the outer ring 1. A third labyrinth portion 39 connected to the second labyrinth portion 37 is formed along the radial direction R through the second bent portion 41 between the wall 33 and the wall surface portion 25 of the hub wheel 4.

このように、本実施例のハブユニット１０１は、アキシャル方向Ａの異なる位置で、ラジアル方向Ｒに形成された２つのラビリンス部（第１ラビリンス部３６と第３ラビリンス部３９）を、アキシャル方向Ａに形成された別のラビリンス部（第２ラビリンス部３７）で連結した形態である。換言すれば、本実施例のハブユニット１０１では、３つのラビリンス部３６，３７，３９が、２つの屈曲部３８，４１によって接続されている。これにより、ラビリンス部３６，３７，３９の形状が複雑になり、異物を侵入させにくくなっている。   As described above, the hub unit 101 according to the present embodiment has two labyrinth portions (the first labyrinth portion 36 and the third labyrinth portion 39) formed in the radial direction R at different positions in the axial direction A. It is the form connected with another labyrinth part formed in (2nd labyrinth part 37). In other words, in the hub unit 101 of the present embodiment, the three labyrinth portions 36, 37, 39 are connected by the two bent portions 38, 41. Thereby, the shape of the labyrinth parts 36, 37, 39 is complicated, and it is difficult for foreign matter to enter.

本実施例のハブユニット１０１の作用について説明する。車両のタイヤが回転するのに伴い、ハブホイール４が所定方向に回転する。そして、走行中の車両のハブユニット１０１の転がり軸受の部分に異物が侵入しようとする。外輪１とハブホイール４との間に形成された第１ラビリンス部３６に侵入した異物は、そのまま第１ラビリンス部３６を通過し、第２ラビリンス部３７に侵入しようとする。ここで、本実施例のハブユニット１０１の場合、第２ラビリンス部３７は、第１ラビリンス部３６に対して斜め方向に屈曲されている。このため、第１ラビリンス部３６を通過した異物は、第１及び第２のラビリンス部３６，３７との接続部（第１屈曲部３８）で堆積し、第２ラビリンス部３７に侵入するのは、そのうちの一部である。即ち、第１屈曲部３８において、異物の侵入が阻止される。第１屈曲部３８に堆積した異物は、ハブホイール４の回転に伴う遠心力により、第１ラビリンス部３６を通って外部に排出され易くなる。   The operation of the hub unit 101 of this embodiment will be described. As the vehicle tire rotates, the hub wheel 4 rotates in a predetermined direction. Then, foreign matter tends to enter the rolling bearing portion of the hub unit 101 of the traveling vehicle. The foreign matter that has entered the first labyrinth portion 36 formed between the outer ring 1 and the hub wheel 4 passes through the first labyrinth portion 36 as it is and tries to enter the second labyrinth portion 37. Here, in the case of the hub unit 101 of the present embodiment, the second labyrinth portion 37 is bent in an oblique direction with respect to the first labyrinth portion 36. For this reason, the foreign matter that has passed through the first labyrinth portion 36 accumulates at the connection portion (first bent portion 38) with the first and second labyrinth portions 36 and 37, and enters the second labyrinth portion 37. , Some of them. That is, intrusion of foreign matter is prevented at the first bent portion 38. The foreign matter accumulated on the first bent portion 38 is easily discharged to the outside through the first labyrinth portion 36 due to the centrifugal force accompanying the rotation of the hub wheel 4.

同様に、第２ラビリンス部３７に侵入した異物は、第２及び第３のラビリンス部３８，３９との接続部（第２屈曲部４１）で堆積し、第３ラビリンス部３９に侵入するのは、そのうちの更に一部である。即ち、第２屈曲部４１においても、異物の侵入が阻止される。   Similarly, the foreign matter that has entered the second labyrinth portion 37 accumulates at the connection portion (second bent portion 41) with the second and third labyrinth portions 38 and 39, and enters the third labyrinth portion 39. , Some of them. That is, intrusion of foreign matter is also prevented at the second bent portion 41.

上記した結果、第１ないし第３のラビリンス部３６，３７，３９を通って密封部材７の部分にまで達する異物の量は、従来のハブユニット１００の場合と比較して極めて少なくなる。しかも、密封部材７の部分にまで達した異物は、密封部材７の各リップ部２６，２８，２９によって、転がり軸受の部分に侵入することが阻止される。これにより、転がり軸受の寿命が長くなる。   As a result, the amount of foreign matter that reaches the portion of the sealing member 7 through the first to third labyrinth portions 36, 37, 39 is extremely small as compared with the case of the conventional hub unit 100. In addition, the foreign matter reaching the portion of the sealing member 7 is prevented from entering the portion of the rolling bearing by the lip portions 26, 28 and 29 of the sealing member 7. This prolongs the life of the rolling bearing.

上記した第１実施例のハブユニット１０１の場合、第２ラビリンス部３７は、第１ラビリンス部３６に対して斜めに屈曲されている。また、第３ラビリンス部３９は、第２ラビリンス部３７に対して斜めに屈曲されている。これにより、第１及び第２の屈曲部３８，４１に堆積した異物を遠心力により排出し易くなっている。しかし、図４に示される第２実施例のハブユニット１０２のように、第２ラビリンス部３７が第１及び第３のラビリンス部３６，３９に対してほぼ直角に屈曲されていてもよい。この場合、異物が、第１ラビリンス部３６から第２ラビリンス部３７へ移動しにくくなるという効果が奏される。   In the case of the hub unit 101 of the first embodiment described above, the second labyrinth portion 37 is bent obliquely with respect to the first labyrinth portion 36. Further, the third labyrinth part 39 is bent obliquely with respect to the second labyrinth part 37. Thereby, the foreign matter deposited on the first and second bent portions 38 and 41 can be easily discharged by centrifugal force. However, like the hub unit 102 of the second embodiment shown in FIG. 4, the second labyrinth portion 37 may be bent at a substantially right angle with respect to the first and third labyrinth portions 36 and 39. In this case, there is an effect that the foreign matter is difficult to move from the first labyrinth portion 36 to the second labyrinth portion 37.

図５に示される第３実施例のハブユニット１０３のように、外輪１の端面部において、第１端面部３１と第２端面部３２とのなす角度θ１と、第２端面部３２と第３端面部３３とのなす角度θ２が異なっていてもよい。この場合、ハブホイール４における車両インナ側に、第３端面部３３と平行で、第２対向面部３５と壁面部２５とを接続する第３対向面部４２が形成される。なお、θ１とθ２は、いずれも９０°以下であり、θ１とθ２が異なること（即ち、第２ラビリンス部３７と第３ラビリンス部３９との間に屈曲部（この場合、第２屈曲部４１）が設けられること）が望ましい。   Like the hub unit 103 of the third embodiment shown in FIG. 5, at the end surface portion of the outer ring 1, the angle θ <b> 1 formed by the first end surface portion 31 and the second end surface portion 32, the second end surface portion 32 and the third end surface portion 3. The angle θ2 formed with the end surface portion 33 may be different. In this case, a third facing surface portion 42 that is parallel to the third end surface portion 33 and connects the second facing surface portion 35 and the wall surface portion 25 is formed on the vehicle inner side of the hub wheel 4. Note that θ1 and θ2 are both 90 ° or less, and θ1 and θ2 are different (that is, a bent portion between the second labyrinth portion 37 and the third labyrinth portion 39 (in this case, the second bent portion 41). ) Is desirable.

更に、図６に示される第４実施例のハブユニット１０４のように、第１及び第３の端面部３１，３３を第２端面部３２と逆方向（この実施例の場合、車両アウタ側に向かう方向）に屈曲させることにより、第１ないし第３のラビリンス部３６，３７，３９がジグザグ形状になるようにしてもよい。   Further, like the hub unit 104 of the fourth embodiment shown in FIG. 6, the first and third end surface portions 31 and 33 are disposed in the opposite direction to the second end surface portion 32 (in this embodiment, on the vehicle outer side). The first to third labyrinth portions 36, 37, and 39 may be formed in a zigzag shape by bending in the direction toward the head.

更に、図７に示される第５実施例のハブユニット１０５のように、４箇所で屈曲させることにより、第１ないし第３のラビリンス部３６，３７，３９に第４ラビリンス部４３及び第５ラビリンス部４４を追加して形成し、ラビリンス部の全体がクランク形状になるようにしてもよい。   Further, as in the hub unit 105 of the fifth embodiment shown in FIG. 7, the fourth labyrinth portion 43 and the fifth labyrinth are added to the first to third labyrinth portions 36, 37, 39 by bending at four positions. The part 44 may be additionally formed so that the entire labyrinth part has a crank shape.

上記した各実施例において、第１ないし第５のラビリンス部３６，３７，３９４３，４４の内幅は、いずれも距離ｅである。しかし、いずれかのラビリンス部３６，３７，３９４３，４４の内幅を、距離ｅよりも長くしても、また短くしてもよい。   In each of the embodiments described above, the inner widths of the first to fifth labyrinth portions 36, 37, 3943, 44 are all the distance e. However, the inner width of any of the labyrinth portions 36, 37, 3943, 44 may be longer or shorter than the distance e.

第１実施例のハブユニット１０１の全体図である。1 is an overall view of a hub unit 101 according to a first embodiment. 密封部材７の拡大図である。4 is an enlarged view of a sealing member 7. FIG. 図２の要部の拡大図である。It is an enlarged view of the principal part of FIG. 第２実施例のハブユニット１０２の要部の拡大図である。It is an enlarged view of the principal part of the hub unit 102 of 2nd Example. 第３実施例のハブユニット１０３の要部の拡大図である。It is an enlarged view of the principal part of the hub unit 103 of 3rd Example. 第４実施例のハブユニット１０４の要部の拡大図である。It is an enlarged view of the principal part of the hub unit 104 of 4th Example. 第５実施例のハブユニット１０５の要部の拡大図である。It is an enlarged view of the principal part of the hub unit 105 of 5th Example. 従来のハブユニット１００の要部の拡大図である。It is an enlarged view of the principal part of the conventional hub unit 100. FIG.

符号の説明Explanation of symbols

１０１〜１０５ ハブユニット（転がり軸受装置）
１ 外輪
２ 内輪部材（内輪）
４ ハブホイール（内輪）
５ 玉（転動体）
６，７ 密封部材
１３，１４，１７，１８ 転動面
２３ 芯金
２４ シール部
２５ 壁面部
２６，２８，２９ リップ部
３１，３２，３３ 端面部
３６，３７，３９，４３，４４ ラビリンス部
Ａ アキシャル方向
ＣＬ 軸線
Ｒ ラジアル方向
θ，θ１，θ２ 角度 101-105 Hub unit (Rolling bearing device)
1 outer ring 2 inner ring member (inner ring)
4 Hub wheel (inner ring)
5 balls (rolling elements)
6, 7 Sealing member 13, 14, 17, 18 Rolling surface 23 Core 24 Seal portion 25 Wall portion 26, 28, 29 Lip portion 31, 32, 33 End surface portion 36, 37, 39, 43, 44 Labyrinth portion A Axial direction CL Axis line R Radial direction θ, θ1, θ2 Angle

Claims (3)

筒状の外輪と、該外輪と同心に配置される内輪と、前記外輪と前記内輪との間に介装される転動体と、前記外輪と前記内輪との間から前記転動体の転動面に異物が侵入しないようにその開口を密封する密封部材とを備え、前記外輪と前記内輪がそれらの軸線周りに相対回転可能にされる転がり軸受装置であって、
前記密封部材は、前記外輪におけるアキシャル方向の端部に嵌合される芯金と、該芯金に被着されるシール部とを備え、前記シール部から突設されたリップ部が、前記内輪における前記外輪と対向する壁面部に接触することにより、前記外輪と前記内輪との間にラジアル方向に沿って形成された隙間を通って侵入する異物を阻止するようにされてなり、
前記外輪におけるアキシャル方向の端面部と、前記内輪における前記外輪の端面部と対向する壁面部との間に、アキシャル方向の異なる位置で、ラジアル方向に形成された２つのラビリンス部を、アキシャル方向に形成された別のラビリンス部で連結したことを特徴とする転がり軸受装置。 A cylindrical outer ring, an inner ring disposed concentrically with the outer ring, a rolling element interposed between the outer ring and the inner ring, and a rolling surface of the rolling element between the outer ring and the inner ring A rolling bearing device that includes a sealing member that seals its opening so that foreign matter does not enter the outer ring, and the outer ring and the inner ring are relatively rotatable about their axes,
The sealing member includes a core metal fitted to an end portion of the outer ring in the axial direction, and a seal part attached to the core metal, and a lip part protruding from the seal part includes the inner ring In contact with the wall portion facing the outer ring in order to prevent foreign matter from entering through a gap formed along the radial direction between the outer ring and the inner ring,
Two labyrinth portions formed in the radial direction at different positions in the axial direction between the end surface portion in the axial direction of the outer ring and the wall surface portion of the inner ring facing the end surface portion of the outer ring are arranged in the axial direction. A rolling bearing device characterized by being connected by another formed labyrinth portion. 前記ラジアル方向の各ラビリンス部は、ラジアル方向に対して所定の角度で傾斜して設けられ、それらの角度はいずれも、前記別のラビリンス部とラジアル方向とがなす角度よりも小であることを特徴とする請求項１に記載の転がり軸受装置。   Each of the labyrinth portions in the radial direction is provided to be inclined at a predetermined angle with respect to the radial direction, and these angles are all smaller than an angle formed by the other labyrinth portion and the radial direction. The rolling bearing device according to claim 1, wherein 前記ラジアル方向の各ラビリンス部は、アキシャル方向の同一位置に非連続状態で設けられた２本の第１ラビリンス部と、それらとアキシャル方向の異なる位置に設けられた第２ラビリンス部とを備え、前記各第１ラビリンス部の端部と前記第２ラビリンス部とを、アキシャル方向に形成された２本の別のラビリンス部で連結し、ラビリンス部の全体をクランク形状としたことを特徴とする請求項１に記載の転がり軸受装置。   Each of the labyrinth portions in the radial direction includes two first labyrinth portions provided in a discontinuous state at the same position in the axial direction, and a second labyrinth portion provided at a position different from the axial direction in the first labyrinth portion, The end portion of each of the first labyrinth portions and the second labyrinth portion are connected by two separate labyrinth portions formed in the axial direction, and the entire labyrinth portion has a crank shape. Item 4. The rolling bearing device according to Item 1.
JP2008265540A 2008-10-14 2008-10-14 Rolling bearing device Pending JP2010096217A (en)

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CN103213498A (en) * 2012-01-23 2013-07-24 株式会社电装 Accelerator apparatus for vehicle
WO2014199663A1 (en) * 2013-06-14 2014-12-18 株式会社クボタ Power transmission device for work machine and work machine
WO2015064400A1 (en) * 2013-11-01 2015-05-07 内山工業株式会社 Bearing sealing device
JP2016014407A (en) * 2014-07-01 2016-01-28 内山工業株式会社 Hermetic device
JP2017106604A (en) * 2015-12-11 2017-06-15 Nok株式会社 Seal structure
JP2019049315A (en) * 2017-09-11 2019-03-28 内山工業株式会社 Seal device

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103213498A (en) * 2012-01-23 2013-07-24 株式会社电装 Accelerator apparatus for vehicle
US8925418B2 (en) 2012-01-23 2015-01-06 Denso Corporation Accelerator apparatus for vehicle
WO2014199663A1 (en) * 2013-06-14 2014-12-18 株式会社クボタ Power transmission device for work machine and work machine
WO2015064400A1 (en) * 2013-11-01 2015-05-07 内山工業株式会社 Bearing sealing device
JP2015086993A (en) * 2013-11-01 2015-05-07 内山工業株式会社 Bearing sealing device
JP2016014407A (en) * 2014-07-01 2016-01-28 内山工業株式会社 Hermetic device
US10119571B2 (en) 2014-07-01 2018-11-06 Uchiyama Manufacturing Corp. Sealing device
JP2017106604A (en) * 2015-12-11 2017-06-15 Nok株式会社 Seal structure
JP2019049315A (en) * 2017-09-11 2019-03-28 内山工業株式会社 Seal device
JP7116457B2 (en) 2017-09-11 2022-08-10 内山工業株式会社 sealing device

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