JP2008222099A - Rolling bearing device for wheel - Google Patents

Rolling bearing device for wheel Download PDF

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Publication number
JP2008222099A
JP2008222099A JP2007064941A JP2007064941A JP2008222099A JP 2008222099 A JP2008222099 A JP 2008222099A JP 2007064941 A JP2007064941 A JP 2007064941A JP 2007064941 A JP2007064941 A JP 2007064941A JP 2008222099 A JP2008222099 A JP 2008222099A
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Prior art keywords
outer ring
inner ring
air passage
ring
wheel
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Pending
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JP2007064941A
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Japanese (ja)
Inventor
Masaaki Matsumoto
正昭 松本
Ikuo Ito
育夫 伊藤
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JTEKT Corp
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JTEKT Corp
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Priority to JP2007064941A priority Critical patent/JP2008222099A/en
Publication of JP2008222099A publication Critical patent/JP2008222099A/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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/005—Fluid passages not relating to lubrication or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/001—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving
    • B60C23/003—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres
    • B60C23/00309—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres characterised by the location of the components, e.g. valves, sealings, conduits or sensors
    • B60C23/00318—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres characterised by the location of the components, e.g. valves, sealings, conduits or sensors on the wheels or the hubs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/001—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving
    • B60C23/003—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres
    • B60C23/00345—Details of the rotational joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/001—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving
    • B60C23/003—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres
    • B60C23/00363—Details of sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device for a wheel having a sealing device of a simple structure forming an air flow passage between an outer ring and an inner ring, and influencing little on sliding resistance when the outer ring and the inner ring relatively rotate. <P>SOLUTION: The rolling bearing device 1 for the wheel has the outer ring 2, the inner ring 3, and a pair of sealing devices 5 sealing a space between the outer ring 2 and the inner ring 3 and forming an in-bearing air passage 1a between both rings. The sealing device 5 has a single sheet-like annular elastic body having a cross section substantially radially covering the space between the outer ring 2 and the inner ring 3. The outer ring 2 and the inner ring 3 have projecting portions 2e, 3e projecting out from an adjacent position of the sealing device 5 in a direction coming close to each other, and the elastic element is pressed against the projecting portions 2e, 3e by air pressure of pressurized air supplied into the in-bearing air passage 1a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、車輪用転がり軸受装置に関する。とりわけタイヤの空気圧を調整するために、加圧空気のエア通路を形成する密封装置を備える車輪用転がり軸受装置に関する。   The present invention relates to a wheel rolling bearing device. More particularly, the present invention relates to a rolling bearing device for a wheel including a sealing device that forms an air passage for pressurized air in order to adjust the air pressure of the tire.

従来、路面状況等に応じてタイヤの空気圧を調整するための装置が知られている（特許文献１参照）。この装置は、自動車に搭載された加圧空気供給源と、その加圧空気供給源とタイヤとを連通するエア通路とを有しており、エア通路は、ナックルと、ナックルに取付けられた車輪用転がり軸受装置と、車輪用転がり軸受装置に取付けられたホイールとに形成されたエア通路を経てタイヤに連通されている。   2. Description of the Related Art Conventionally, an apparatus for adjusting tire air pressure according to road surface conditions is known (see Patent Document 1). This device has a pressurized air supply source mounted on an automobile, and an air passage that communicates the pressurized air supply source and the tire. The air passage includes a knuckle and a wheel attached to the knuckle. It communicates with the tire via an air passage formed in the rolling bearing device for use and a wheel attached to the rolling bearing device for wheels.

車輪用転がり軸受装置のエア通路は、外輪を貫通するエア通路と、内輪を貫通するエア通路と、これらエア通路を連通するエア通路を形成するために外輪と内輪の間を密封する密封装置とを有している（特許文献２参照）。この密封装置は、外輪の内周面に嵌合固定される金属環と、金属環に固着されている弾性体を有しており、弾性体は、内輪に摺接するリップを有している。したがって従来の密封装置は、複雑な構造になっていた。しかも弾性体のリップは、加圧空気に耐え得るように内輪に常に強く摺接されており、外輪と内輪の相対回動時の摺動抵抗になるという問題も有していた。
特開２０００−２５５２２８号公報 特開２００５−１５５７４６号公報 The air passage of the rolling bearing device for a wheel includes an air passage that penetrates the outer ring, an air passage that penetrates the inner ring, and a sealing device that seals between the outer ring and the inner ring to form an air passage that communicates with the air passage. (See Patent Document 2). This sealing device has a metal ring fitted and fixed to the inner peripheral surface of the outer ring, and an elastic body fixed to the metal ring, and the elastic body has a lip that is in sliding contact with the inner ring. Therefore, the conventional sealing device has a complicated structure. In addition, the lip of the elastic body is always in slidable contact with the inner ring so as to be able to withstand the pressurized air, and has a problem that it becomes a sliding resistance during the relative rotation of the outer ring and the inner ring.
JP 2000-255228 A JP 2005-155746 A

そこで本発明は、外輪と内輪の間にエア流路を形成する密封装置を有し、該密封装置が簡易な構造でかつ外輪と内輪の相対回動時の摺動抵抗に影響の少ない構成になっている車輪用転がり軸受装置を提供することを課題とする。   Therefore, the present invention has a sealing device that forms an air flow path between the outer ring and the inner ring, and the sealing device has a simple structure and a configuration that has little influence on the sliding resistance during the relative rotation of the outer ring and the inner ring. It is an object to provide a rolling bearing device for a wheel.

前記課題を解決するために本発明は、各請求項に記載の通りの構成を備える車輪用転がり軸受装置の密封装置であることを特徴とする。すなわち請求項１に記載の発明によると、密封装置は、環状でかつ、外輪と内輪間を径方向にほぼ覆う断面を有する一枚状の弾性体を有している。そして外輪と内輪は、密封装置の隣接位置から相互に近接する方向に突出する突出部を有し、軸受内エア通路に供給された加圧空気の気圧によって弾性体が突出部に押し付けられる構成になっている。   In order to solve the above-mentioned problems, the present invention is a sealing device for a rolling bearing device for a wheel having a configuration as described in each claim. In other words, according to the first aspect of the present invention, the sealing device has a single elastic body that is annular and has a cross section that substantially covers the space between the outer ring and the inner ring in the radial direction. The outer ring and the inner ring have protrusions that protrude in directions close to each other from adjacent positions of the sealing device, and the elastic body is pressed against the protrusions by the pressure of the pressurized air supplied to the air passage in the bearing. It has become.

したがって密封装置は、環状の一枚状の弾性体を有する構成であるために、従来の密封装置よりも簡易な構成になっている。しかも弾性体は、加圧空気の気圧によって外輪と内輪の突出部に押し付けられて密封力が強くなる。そのため密封装置は、従来のように内輪の外周面に常に強く摺接するリップ等を設ける必要がなく、小さな摺動抵抗にて内輪や外輪に対して摺接し得る形態になっている。   Therefore, since the sealing device has a configuration having an annular single elastic body, the configuration is simpler than the conventional sealing device. In addition, the elastic body is pressed against the protrusions of the outer ring and the inner ring by the pressure of the pressurized air, and the sealing force is increased. For this reason, the sealing device does not need to be provided with a lip or the like that always slidably contacts the outer peripheral surface of the inner ring as in the prior art, and is configured to be able to slidably contact the inner ring or the outer ring with a small sliding resistance.

請求項２に記載の発明によると、外輪と内輪の突出部には、密封装置側に軸受内エア通路から除々に軸方向に離間する傾斜面が形成されている。そして弾性体は、外輪と内輪の傾斜面延長間の角度よりも大きい曲げ中心角を有した状態で外輪と内輪の間に配設され、かつ軸受内エア通路に加圧空気が供給された際に加圧空気の気圧によって曲げ中心角が小さくなって傾斜面に押し付けられる構成になっている。   According to the second aspect of the present invention, the projecting portions of the outer ring and the inner ring are formed with inclined surfaces that are gradually separated from the bearing air passage in the axial direction on the sealing device side. The elastic body is disposed between the outer ring and the inner ring in a state having a bending center angle larger than the angle between the inclined surfaces of the outer ring and the inner ring, and when pressurized air is supplied to the bearing air passage. In addition, the bending center angle is reduced by the pressure of the pressurized air and is pressed against the inclined surface.

したがって外輪と内輪の突出部の傾斜面によって除々に幅が狭くなる狭窄部が形成され、その狭窄部に弾性体が曲がった状態で設置される。そして弾性体は、曲げ中心角が傾斜面間の角度よりも大きいために傾斜面との間に隙間を有しており、その状態から加圧空気の圧力によって曲げ中心角が小さくなって傾斜面に押し付けられる。そのため弾性体は、加圧空気の圧力によって密封力が増す。しかも弾性体は、曲げ中心角を有した状態で設置されているために、曲げ方向が一定になって確実に突出部の傾斜面に押し付けられ得る。   Accordingly, a narrowed portion with a gradually narrowing width is formed by the inclined surfaces of the protruding portions of the outer ring and the inner ring, and the elastic body is installed in a bent state in the narrowed portion. And since the bending center angle is larger than the angle between the inclined surfaces, the elastic body has a gap between the inclined surfaces. From this state, the bending center angle becomes smaller due to the pressure of the pressurized air, and the inclined surface. Pressed against. Therefore, the sealing force of the elastic body is increased by the pressure of the pressurized air. In addition, since the elastic body is installed in a state having a bending center angle, the bending direction becomes constant and the elastic body can be reliably pressed against the inclined surface of the protruding portion.

本発明の実施の形態を図１〜４にしたがって説明する。本形態の車輪用転がり軸受装置１は、図１に示すようにタイヤの空気圧を路面状況等に応じて調整するタイヤ空気圧調整装置１０の一部品として利用される。タイヤ空気圧調整装置１０は、加圧空気供給源１７と、加圧空気供給源１７とタイヤ１８とを連通するエア通路とを有し、エア通路は、転がり軸受装置１やハブ１２等を経由してタイヤ１８と連通されている。   An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the wheel rolling bearing device 1 of this embodiment is used as a part of a tire air pressure adjusting device 10 that adjusts the tire air pressure according to the road surface condition or the like. The tire air pressure adjusting device 10 includes a pressurized air supply source 17 and an air passage that communicates the pressurized air supply source 17 and the tire 18, and the air passage passes through the rolling bearing device 1, the hub 12, and the like. The tire 18 communicates with the tire 18.

加圧空気供給源１７は、コンプレッサ等によって圧縮された加圧空気を蓄えるタンクであって、車両に搭載されている。加圧空気供給源１７は、図１に示すようにナックル１１に形成されたエア通路１１ａに配管を介して接続される。ナックル１１には、転がり軸受装置１が取付けられ、ナックル１１のエア通路１１ａは、転がり軸受装置１の外輪２に形成されたエア通路２ａと連通される。   The pressurized air supply source 17 is a tank that stores pressurized air compressed by a compressor or the like, and is mounted on the vehicle. The pressurized air supply source 17 is connected to an air passage 11a formed in the knuckle 11 via a pipe as shown in FIG. A rolling bearing device 1 is attached to the knuckle 11, and an air passage 11 a of the knuckle 11 communicates with an air passage 2 a formed in the outer ring 2 of the rolling bearing device 1.

転がり軸受装置１の内周側には、図１に示すようにハブ１２が取付けられる。ハブ１２は、エア通路１２ａとフランジ１２ｂを有している。エア通路１２ａは、転がり軸受装置１の内輪３に形成されたエア通路３ｃと連通される。フランジ１２ｂには、ホイール１４とブレーキロータ１５が取付けられる。ホイール１４には、ホイール１４を貫通してホイール１４の外周面に取付けられたタイヤ１８と連通するエア通路１４ａが形成されている。   A hub 12 is attached to the inner peripheral side of the rolling bearing device 1 as shown in FIG. The hub 12 has an air passage 12a and a flange 12b. The air passage 12 a communicates with an air passage 3 c formed in the inner ring 3 of the rolling bearing device 1. A wheel 14 and a brake rotor 15 are attached to the flange 12b. In the wheel 14, an air passage 14 a that penetrates the wheel 14 and communicates with a tire 18 attached to the outer peripheral surface of the wheel 14 is formed.

ハブ１２の軸中心には、図１に示すように車軸部材１３が取付けられる。したがってエンジンの回転力によって車軸部材１３が回転することで、ハブ１２と、転がり軸受装置１の内輪３と、ホイール１４が回転する。ホイール１４の内周部には、切換弁ユニット１６が取付けられている。切換弁ユニット１６は、ホイール１４に取付けられるハウジング１６ａと、ハウジング１６ａ内に設けられる弁１６ｃを有している。ハウジング１６ａ内の空気室１６ｂには、ハブ１２のエア通路１２ａと、ホイール１４のエア通路１４ａが連通されており、弁１６ｃがそのエア通路を開閉する。したがって弁１６ｃを開けることで加圧空気がタイヤ１８側に供給され得る。   An axle member 13 is attached to the center of the hub 12 as shown in FIG. Therefore, when the axle member 13 is rotated by the rotational force of the engine, the hub 12, the inner ring 3 of the rolling bearing device 1, and the wheel 14 are rotated. A switching valve unit 16 is attached to the inner periphery of the wheel 14. The switching valve unit 16 has a housing 16a attached to the wheel 14 and a valve 16c provided in the housing 16a. The air passage 16a of the hub 12 and the air passage 14a of the wheel 14 are communicated with the air chamber 16b in the housing 16a, and the valve 16c opens and closes the air passage. Therefore, the pressurized air can be supplied to the tire 18 side by opening the valve 16c.

転がり軸受装置１は、図２に示すように外輪２と内輪３と、これらの間に設けられる二列の転動体４と、二対の密封装置５，６を有している。外輪２の外周面には、ナックル１１に取付けられる取付フランジ２ｂが形成されている。外輪２の内周面には、二列の軌道面２ｃと肩部２ｄと突出部２ｅが形成されている。各軌道面２ｃには、複数の転動体４が転動可能に配設され、転動体４は、保持器７によって周方向に所定間隔毎に保持されている。   As shown in FIG. 2, the rolling bearing device 1 includes an outer ring 2 and an inner ring 3, two rows of rolling elements 4 provided therebetween, and two pairs of sealing devices 5 and 6. A mounting flange 2 b that is attached to the knuckle 11 is formed on the outer peripheral surface of the outer ring 2. Two rows of raceway surfaces 2c, shoulder portions 2d, and protruding portions 2e are formed on the inner peripheral surface of the outer ring 2. On each raceway surface 2c, a plurality of rolling elements 4 are disposed so as to be able to roll, and the rolling elements 4 are held at predetermined intervals in the circumferential direction by a cage 7.

肩部２ｄは、図２に示すように軌道面２ｃの中心側に隣接されている。突出部２ｅは、肩部２ｄの中心側の隣接位置から内輪３側に突出し、外輪２の全周に渡って形成されている。突出部２ｅの中心側隣接位置には、密封装置５が設置されている。密封装置５は、外輪２と内輪３の間を密封して、外輪２と内輪３の間に軸受内エア通路１ａを形成する。外輪２には、径方向にエア通路２ａが貫通されている。エア通路２ａは、内周開口部が軸受内エア通路１ａに開口しており、外周開口部がナックル１１のエア通路１１ａに連通されている。   As shown in FIG. 2, the shoulder 2d is adjacent to the center side of the raceway surface 2c. The protruding portion 2 e protrudes from the adjacent position on the center side of the shoulder portion 2 d to the inner ring 3 side, and is formed over the entire circumference of the outer ring 2. A sealing device 5 is installed at a position adjacent to the center of the protruding portion 2e. The sealing device 5 seals between the outer ring 2 and the inner ring 3, and forms an in-bearing air passage 1 a between the outer ring 2 and the inner ring 3. An air passage 2 a is penetrated through the outer ring 2 in the radial direction. The air passage 2 a has an inner peripheral opening that opens to the bearing air passage 1 a and an outer peripheral opening that communicates with the air passage 11 a of the knuckle 11.

内輪３は、図２に示すように軸方向に突き合わされる別体の分割内輪３ａ，３ｂを有している。そして内輪３は、ハブ１２の端面外周面に形成された雄ねじ部２２に螺合されたナット２３によって軸方向に位置合わせされる。分割内輪３ａ，３ｂは、外周面に軌道面３ｄと突出部３ｅを有している。軌道面３ｄには、転動体４が転動可能に設置される。突出部３ｅは、軌道面３ｄの隣接位置から外輪２側に突出し、内輪３の全周に渡って形成されている。突出部３ｅの隣接位置には、密封装置５が設置される。   As shown in FIG. 2, the inner ring 3 has separate divided inner rings 3 a and 3 b that are abutted in the axial direction. The inner ring 3 is aligned in the axial direction by a nut 23 screwed into a male screw portion 22 formed on the outer peripheral surface of the end surface of the hub 12. The divided inner rings 3a and 3b have a raceway surface 3d and a protruding portion 3e on the outer peripheral surface. The rolling element 4 is installed on the raceway surface 3d so that it can roll. The protrusion 3 e protrudes from the position adjacent to the raceway surface 3 d toward the outer ring 2 and is formed over the entire circumference of the inner ring 3. A sealing device 5 is installed at a position adjacent to the protruding portion 3e.

分割内輪３ａ，３ｂの間には、図２に示すように内輪３を径方向に貫通するエア通路３ｃが形成されている。エア通路３ｃは、図４に示すように分割内輪３ａ，３ｂが互いに当接する当接端面の分割内輪３ａ側または分割内輪３ｂ側のいずれか少なくとも一方に軸方向に窪んだ凹部３ｇを形成することによって形成されている。エア通路３ｃは、内輪３に一つまたは周方向に複数形成されており、外周開口部が一対の密封装置５間の軸受内エア通路１ａに開口している。そして内周開口部がハブ１２に形成されたエア通路１２ａに連通されている。   Between the divided inner rings 3a and 3b, an air passage 3c that penetrates the inner ring 3 in the radial direction is formed as shown in FIG. As shown in FIG. 4, the air passage 3c has a recess 3g that is recessed in the axial direction on at least one of the split inner ring 3a side and the split inner ring 3b side of the abutting end surface where the split inner rings 3a and 3b come into contact with each other. Is formed by. One or a plurality of air passages 3 c are formed in the inner ring 3 in the circumferential direction, and the outer peripheral opening is open to the in-bearing air passage 1 a between the pair of sealing devices 5. The inner peripheral opening communicates with an air passage 12 a formed in the hub 12.

密封装置５は、図３に示すようにゴム等の弾性材料から形成された弾性体のみから形成されている。該弾性体は、環状でかつ一枚状であって、外輪２と内輪３間を径方向にほぼ覆う断面を有している。そして該弾性体の外周部が外輪２の内周面に当接され、内周部が内輪３の外周面に当接されている。該弾性体は、外輪２と内輪３の間に屈曲状または湾曲状に曲げられた状態で設けられており、曲げ中心角５ａを有している。曲げ方向は、断面中心部が軸受内エア通路１ａから離間する方向、すなわち突出部２ｅ，３ｅ側に位置する方向である。   As shown in FIG. 3, the sealing device 5 is formed only of an elastic body formed of an elastic material such as rubber. The elastic body is annular and has a single shape and has a cross section that substantially covers the space between the outer ring 2 and the inner ring 3 in the radial direction. The outer peripheral portion of the elastic body is in contact with the inner peripheral surface of the outer ring 2, and the inner peripheral portion is in contact with the outer peripheral surface of the inner ring 3. The elastic body is provided in a bent or curved state between the outer ring 2 and the inner ring 3 and has a bending center angle 5a. The bending direction is a direction in which the central portion of the cross section is separated from the bearing air passage 1a, that is, a direction located on the protruding portions 2e and 3e side.

突出部２ｅ，３ｅは、図３に示すように密封装置５側に傾斜面２ｅ１，３ｅ１を有している。傾斜面２ｅ１，３ｅ１は、軸受内エア通路１ａから除々に軸方向に離間しており、傾斜面２ｅ１，３ｅ１の延長間に角度１ｂを形成する。したがって傾斜面２ｅ１，３ｅ１の間には、除々に径方向の幅が狭くなる狭窄部１ｃが形成される。そして狭窄部１ｃに密封装置５が曲げられた状態で設置される。密封装置５の弾性体の曲げ中心角５ａは、傾斜面２ｅ１，３ｅ１の延長間の角度１ｂよりも大きく、弾性体と突出部２ｅ，３ｅの間に隙間を形成する。   The protruding portions 2e and 3e have inclined surfaces 2e1 and 3e1 on the sealing device 5 side as shown in FIG. The inclined surfaces 2e1 and 3e1 are gradually separated from the in-bearing air passage 1a in the axial direction, and an angle 1b is formed between the extensions of the inclined surfaces 2e1 and 3e1. Therefore, between the inclined surfaces 2e1 and 3e1, a narrowed portion 1c having a gradually narrower radial width is formed. And the sealing apparatus 5 is installed in the state which bent in the constriction part 1c. The bending center angle 5a of the elastic body of the sealing device 5 is larger than the angle 1b between the extensions of the inclined surfaces 2e1 and 3e1, and a gap is formed between the elastic body and the protruding portions 2e and 3e.

図３に示すように傾斜面２ｅ１，３ｅ１の基端部には、密封装置５の端部が嵌め込まれる溝２ｆ，３ｆが形成されている。したがって密封装置５は、溝２ｆ，３ｆによって軸受内エア通路１ａ側に移動することが規制されている。   As shown in FIG. 3, grooves 2f and 3f into which the ends of the sealing device 5 are fitted are formed at the base ends of the inclined surfaces 2e1 and 3e1. Therefore, the sealing device 5 is restricted from moving toward the bearing inner air passage 1a by the grooves 2f and 3f.

一対の密封装置６は、図２に示すように外輪２と内輪３の軸方向の両端部に嵌合されている。密封装置６は、外輪２と内輪３の間を密封して、転がり軸受装置１内に外方向から水等が侵入することを防止する。そして密封装置６と密封装置５の間には、グリースが注入される。   The pair of sealing devices 6 are fitted to both ends of the outer ring 2 and the inner ring 3 in the axial direction as shown in FIG. The sealing device 6 seals between the outer ring 2 and the inner ring 3 to prevent water or the like from entering the rolling bearing device 1 from the outside. Then, grease is injected between the sealing device 6 and the sealing device 5.

図１に示すように加圧空気供給源１７から加圧空気が放出されると、加圧空気の圧力がナックル１１のエア通路１１ａを経て、外輪２のエア通路２ａと、軸受内エア通路１ａに供給される。軸受内エア通路１ａに加圧空気が供給されると、図４に示すように加圧空気の気圧によって密封装置５が突出部２ｅ，３ｅの傾斜面２ｅ１，３ｅ１に向けて押される。そして密封装置５の弾性体の曲げ中心角が図３の５ａから図４の５ｂに小さくなり、弾性体が傾斜面２ｅ１，３ｅ１に押し付けられる。そのため弾性体は、傾斜面２ｅ１，３ｅ１との密着面積が多くなり、密封力が増加する。その後、加圧空気の気圧は、内輪３のエア通路３ｃと、ハブ１２のエア通路１２ａと、ホイール１４のエア通路１４ａとを経てタイヤ１８に供給される。これによりタイヤ１８の空気圧が調整される。   As shown in FIG. 1, when pressurized air is released from the pressurized air supply source 17, the pressure of the pressurized air passes through the air passage 11a of the knuckle 11, and the air passage 2a of the outer ring 2 and the air passage 1a in the bearing. To be supplied. When pressurized air is supplied to the in-bearing air passage 1a, the sealing device 5 is pushed toward the inclined surfaces 2e1 and 3e1 of the projecting portions 2e and 3e by the pressure of the pressurized air as shown in FIG. Then, the bending center angle of the elastic body of the sealing device 5 decreases from 5a in FIG. 3 to 5b in FIG. 4, and the elastic body is pressed against the inclined surfaces 2e1 and 3e1. Therefore, the elastic body has a large contact area with the inclined surfaces 2e1 and 3e1, and the sealing force increases. Thereafter, the pressure of the pressurized air is supplied to the tire 18 through the air passage 3 c of the inner ring 3, the air passage 12 a of the hub 12, and the air passage 14 a of the wheel 14. Thereby, the air pressure of the tire 18 is adjusted.

以上のようにして実施の形態が形成される。すなわち密封装置５は、図２に示すように環状でかつ、外輪２と内輪３間を径方向にほぼ覆う断面を有する一枚状の弾性体を有している。そして外輪２と内輪３は、密封装置５の隣接位置から相互に近接する方向に突出する突出部２ｅ，３ｅを有し、軸受内エア通路１ａに供給された加圧空気の気圧によって弾性体が突出部２ｅ，３ｅに押し付けられる構成になっている。   The embodiment is formed as described above. That is, as shown in FIG. 2, the sealing device 5 has a single elastic body that is annular and has a cross section that substantially covers the space between the outer ring 2 and the inner ring 3 in the radial direction. The outer ring 2 and the inner ring 3 have projecting portions 2e and 3e that project from the adjacent positions of the sealing device 5 toward each other, and the elastic body is caused by the pressure of the pressurized air supplied to the bearing air passage 1a. It is the structure pressed against protrusion part 2e, 3e.

したがって密封装置５は、環状の一枚状の弾性体を有する構成であるために、従来の密封装置よりも簡易な構成になっている。しかも弾性体は、加圧空気の気圧によって外輪２と内輪３の突出部２ｅ，３ｅに押し付けられて密封力が強くなる。そのため密封装置５は、従来のように内輪の外周面に常に強く摺接するリップ等を設ける必要がなく、小さな摺動抵抗にて内輪３や外輪２に対して摺接し得る形態になっている。   Therefore, since the sealing device 5 has a structure having an annular single elastic body, the sealing device 5 has a simpler structure than the conventional sealing device. Moreover, the elastic body is pressed against the protrusions 2e and 3e of the outer ring 2 and the inner ring 3 by the pressure of the pressurized air, and the sealing force is increased. For this reason, the sealing device 5 does not need to be provided with a lip or the like that always slidably comes into contact with the outer peripheral surface of the inner ring as in the prior art, and is configured to be able to slidably contact the inner ring 3 or the outer ring 2 with a small sliding resistance.

外輪２と内輪３の突出部２ｅ，３ｅには、図３に示すように密封装置５側に軸受内エア通路１ａから除々に軸方向に離間する傾斜面２ｅ１が形成されている。そして弾性体は、外輪２と内輪３の傾斜面２ｅ１，３ｅ１延長間の角度１ｂよりも大きい曲げ中心角５ａを有した状態で外輪２と内輪３の間に配設され、かつ軸受内エア通路１ａに加圧空気が供給された際に加圧空気の気圧によって曲げ中心角が図３の５ａから図４の５ｂに小さくなって傾斜面２ｅ１，３ｅ１に押し付けられる構成になっている。   As shown in FIG. 3, the projecting portions 2e and 3e of the outer ring 2 and the inner ring 3 are formed with inclined surfaces 2e1 which are gradually separated from the bearing inner air passage 1a in the axial direction on the sealing device 5 side. The elastic body is disposed between the outer ring 2 and the inner ring 3 with a bending center angle 5a larger than an angle 1b between the inclined surfaces 2e1 and 3e1 of the outer ring 2 and the inner ring 3, and an air passage in the bearing. When pressurized air is supplied to 1a, the bending center angle decreases from 5a in FIG. 3 to 5b in FIG. 4 due to the pressure of the pressurized air, and is pressed against the inclined surfaces 2e1 and 3e1.

したがって図３に示すように外輪２と内輪３の突出部２ｅ，３ｅの傾斜面２ｅ１，３ｅ１によって除々に幅が狭くなる狭窄部１ｃが形成され、その狭窄部１ｃに弾性体（５）が曲がった状態で設置される。そして弾性体は、曲げ中心角５ａが傾斜面２ｅ１，３ｅ１間の角度１ｂよりも大きいため、傾斜面２ｅ１，３ｅ１との間に隙間を有しており、その状態から加圧空気の圧力によって曲げ中心角が小さくなって傾斜面２ｅ１，３ｅ１に押し付けられる。そのため弾性体は、加圧空気の圧力によって密封力が増す。しかも弾性体は、曲げ中心角を有した状態で設置されているために、曲げ方向が一定になって確実に突出部２ｅ，３ｅの傾斜面２ｅ１，３ｅ１に押し付けられ得る。   Therefore, as shown in FIG. 3, a narrowed portion 1c having a gradually narrowing width is formed by the inclined surfaces 2e1 and 3e1 of the protrusions 2e and 3e of the outer ring 2 and the inner ring 3, and the elastic body (5) is bent at the narrowed portion 1c. It is installed in the state. Since the bending center angle 5a is larger than the angle 1b between the inclined surfaces 2e1 and 3e1, the elastic body has a gap between the inclined surfaces 2e1 and 3e1, and is bent from the state by the pressure of pressurized air. The central angle is reduced and pressed against the inclined surfaces 2e1 and 3e1. Therefore, the sealing force of the elastic body is increased by the pressure of the pressurized air. In addition, since the elastic body is installed in a state having a bending center angle, the bending direction is constant, and the elastic body can be reliably pressed against the inclined surfaces 2e1 and 3e1 of the protruding portions 2e and 3e.

（他の実施の形態）
本発明は、上記実施の形態に限定されず、以下の形態等であっても良い。
（１）例えば上記実施の形態の密封装置５は、弾性体のみから形成されていた。しかし弾性体の外周端部または内周端部に外輪または内輪に固定的あるいは摺動可能に当接される金属環が取付けられている形態等であっても良い。
（２）上記実施の形態の外輪２と内輪３の突出部２ｅ，３ｅは、傾斜面２ｅ１，３ｅ１を有していた。しかし傾斜面２ｅ１，３ｅ１を有さず、外輪２の内周面または内輪３の外周面から径方向に突出する垂直面を有している形態であっても良い。
（３）上記実施の形態の密封装置５の弾性体は、曲げ中心角５ａを有した状態で外輪２と内輪３間に設置されていた。すなわち弾性体の自由状態は、曲げを有しない形態でも良いし、曲げ中心角５ａよりも大きい曲げ中心角を有している形態であっても良い。そして曲げ方向に曲げやすくするために、弾性体の曲げ部分の外側面側に切れ込みが形成されている形態等であっても良い。
（４）上記実施の形態は、密封装置５の軸方向の位置ずれ防止として外輪２に形成した溝２ｆと、内輪３に形成した溝３ｆを有していた。しかし外輪と内輪に別体に形成した蓋を外輪と内輪に嵌合させ、これらの間に密封装置の軸方向の位置ずれ防止する溝を形成する形態等であっても良い。 (Other embodiments)
The present invention is not limited to the above-described embodiment, and may be the following form.
(1) For example, the sealing device 5 of the above-described embodiment is formed only from an elastic body. However, a configuration in which a metal ring that is fixedly or slidably contacted with the outer ring or the inner ring may be attached to the outer peripheral end or the inner peripheral end of the elastic body.
(2) The protrusions 2e and 3e of the outer ring 2 and the inner ring 3 of the above embodiment have inclined surfaces 2e1 and 3e1. However, the configuration may be such that it does not have the inclined surfaces 2e1 and 3e1, but has a vertical surface protruding radially from the inner peripheral surface of the outer ring 2 or the outer peripheral surface of the inner ring 3.
(3) The elastic body of the sealing device 5 of the above embodiment is installed between the outer ring 2 and the inner ring 3 in a state having the bending center angle 5a. That is, the free state of the elastic body may be a form that does not have a bend, or may have a form that has a bend center angle larger than the bend center angle 5a. And in order to make it easy to bend in a bending direction, the form etc. which the notch was formed in the outer surface side of the bending part of an elastic body may be sufficient.
(4) The above embodiment has the groove 2 f formed in the outer ring 2 and the groove 3 f formed in the inner ring 3 to prevent the axial displacement of the sealing device 5. However, a configuration in which a lid formed separately for the outer ring and the inner ring is fitted to the outer ring and the inner ring, and a groove for preventing axial displacement of the sealing device may be formed between them.

タイヤ空気調整装置の断面図である。It is sectional drawing of a tire air conditioning apparatus. 密封装置近傍の転がり軸受装置の一部断面拡大図である。It is a partial cross-section enlarged view of the rolling bearing device in the vicinity of the sealing device. 軸受内エア通路に加圧空気を供給していない状態における密封装置近傍の転がり軸受装置の一部断面拡大図である。It is a partial cross-section enlarged view of the rolling bearing device in the vicinity of the sealing device in a state where pressurized air is not supplied to the air passage in the bearing. 軸受内エア通路に加圧空気を供給した状態における密封装置近傍の転がり軸受装置の一部断面拡大図である。It is a partial cross section enlarged view of the rolling bearing device in the vicinity of the sealing device in a state where pressurized air is supplied to the air passage in the bearing. 図２の矢印Ｖ方向からの内輪および密封装置の一部上面拡大図である。FIG. 4 is a partially enlarged top view of the inner ring and the sealing device from the direction of arrow V in FIG. 2.

符号の説明Explanation of symbols

１・・・転がり軸受装置
１ａ・・・軸受内エア通路
２・・・外輪
２ａ，３ｃ，１１ａ，１２ａ，１４ａ・・・エア通路
２ｅ，３ｅ・・・突出部
２ｅ１，３ｅ１・・・傾斜面
２ｆ，３ｆ・・・溝
３・・・内輪
４・・・転動体
５，６・・・密封装置
５ａ，５ｂ・・・曲げ中心角
１０・・・タイヤ空気圧調整装置
１１・・・ナックル
１２・・・ハブ
１４・・・ホイール
１７・・・加圧空気供給源
１８・・・タイヤ

DESCRIPTION OF SYMBOLS 1 ... Rolling bearing apparatus 1a ... Bearing air passage 2 ... Outer ring 2a, 3c, 11a, 12a, 14a ... Air passage 2e, 3e ... Projection part 2e1, 3e1 ... Inclined surface 2f, 3f ... groove 3 ... inner ring 4 ... rolling elements 5, 6 ... sealing devices 5a, 5b ... bending angle 10 ... tire pressure adjusting device 11 ... knuckle 12 .... Hub 14 ... Wheel 17 ... Pressurized air supply source 18 ... Tire

Claims (2)

エア通路が貫通された外輪と、前記外輪に転動体を介して相対回動しかつエア通路が貫通された内輪と、前記外輪と前記内輪の間を密封して両輪間に軸受内エア通路を形成する一対の密封装置とを有し、前記外輪のエア通路と前記軸受内エア通路と前記内輪のエア通路とが連通される車輪用転がり軸受装置であって、
前記密封装置は、環状でかつ、前記外輪と前記内輪間を径方向にほぼ覆う断面を有する一枚状の弾性体を有し、
前記外輪と前記内輪は、前記密封装置の隣接位置から相互に近接する方向に突出する突出部を有し、前記軸受内エア通路に供給された加圧空気の気圧によって前記弾性体が前記突出部に押し付けられる構成になっていることを特徴とする車輪用転がり軸受装置。 An outer ring through which an air passage is penetrated, an inner ring that rotates relative to the outer ring via a rolling element and the air passage is penetrated, a seal between the outer ring and the inner ring, and an air passage in the bearing between the two rings. A rolling bearing device for a wheel having a pair of sealing devices to be formed, wherein the air passage of the outer ring, the air passage in the bearing, and the air passage of the inner ring communicate with each other,
The sealing device has a single-piece elastic body that is annular and has a cross section that substantially covers the space between the outer ring and the inner ring in the radial direction;
The outer ring and the inner ring have protrusions protruding in directions close to each other from adjacent positions of the sealing device, and the elastic body is protruded by the pressure of pressurized air supplied to the air passage in the bearing. A rolling bearing device for a wheel, characterized by being configured to be pressed against the wheel. 請求項１に記載の車輪用転がり軸受装置であって、
外輪と内輪の突出部には、密封装置側に軸受内エア通路から除々に軸方向に離間する傾斜面が形成されており、
弾性体は、前記外輪と前記内輪の傾斜面延長間の角度よりも大きい曲げ中心角を有した状態で前記外輪と前記内輪の間に配設され、かつ前記軸受内エア通路に加圧空気が供給された際に前記加圧空気の気圧によって前記曲げ中心角が小さくなって前記傾斜面に押し付けられる構成になっていることを特徴とする車輪用転がり軸受装置。

It is a rolling bearing device for wheels according to claim 1,
An inclined surface that is gradually separated from the air passage in the bearing in the axial direction is formed on the protruding portion of the outer ring and the inner ring,
The elastic body is disposed between the outer ring and the inner ring in a state having a bending center angle larger than the angle between the inclined surface extensions of the outer ring and the inner ring, and pressurized air is supplied to the bearing inner air passage. A rolling bearing device for a wheel, characterized in that, when supplied, the bending center angle is reduced by the pressure of the pressurized air and is pressed against the inclined surface.

JP2007064941A 2007-03-14 2007-03-14 Rolling bearing device for wheel Pending JP2008222099A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007064941A JP2008222099A (en) 2007-03-14 2007-03-14 Rolling bearing device for wheel

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JP2007064941A JP2008222099A (en) 2007-03-14 2007-03-14 Rolling bearing device for wheel

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017012976A1 (en) * 2015-07-17 2017-01-26 Jaguar Land Rover Limited Annular coupler for a central tyre inflation system
US20210031571A1 (en) * 2019-07-31 2021-02-04 Polaris Industries Inc. Central Tire Deflation/Inflation System
CN112682511A (en) * 2020-12-29 2021-04-20 三一重型装备有限公司 Rotating wheel and engineering equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017012976A1 (en) * 2015-07-17 2017-01-26 Jaguar Land Rover Limited Annular coupler for a central tyre inflation system
US20210031571A1 (en) * 2019-07-31 2021-02-04 Polaris Industries Inc. Central Tire Deflation/Inflation System
CN112682511A (en) * 2020-12-29 2021-04-20 三一重型装备有限公司 Rotating wheel and engineering equipment

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