JP2013256246A - Bearing structure - Google Patents

Bearing structure Download PDF

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Publication number
JP2013256246A
JP2013256246A JP2012134591A JP2012134591A JP2013256246A JP 2013256246 A JP2013256246 A JP 2013256246A JP 2012134591 A JP2012134591 A JP 2012134591A JP 2012134591 A JP2012134591 A JP 2012134591A JP 2013256246 A JP2013256246 A JP 2013256246A
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Prior art keywords
hub
dam seal
axle
drive shaft
seal
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JP2012134591A
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Japanese (ja)
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Yasuji Ono
靖治 小野
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Hino Motors Ltd
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Hino Motors Ltd
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Priority to JP2012134591A priority Critical patent/JP2013256246A/en
Publication of JP2013256246A publication Critical patent/JP2013256246A/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
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
    • F16C19/386—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings 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
    • 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant

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

Abstract

PROBLEM TO BE SOLVED: To provide a bearing structure allowing replacement of a dam seal without scattering differential oil during maintenance.SOLUTION: In regard to a bearing structure in which a hub 2 is rotatably fitted from outside via a unit bearing 3 to an axle end 4 protrudedly provided on an end of an axle shaft, a drive shaft 13 is thrusted into an interior of the axle shaft from a side of the axle end 4 and a flange portion 13a of its opposite thrust side is fastened to the hub 2, and a dam seal 16 fitted throughout a whole circumference to an inner circumferential surface of the hub 2 and constituting a wall surface toward a radial inward side of the hub, is provided in a space between the unit bearing 3 in the hub 2 and the flange portion 13a of the drive shaft 13, the dam seal 16 is composed by vulcanizing and adhering rubber 22 to a metal ring body 21 having openings 20 in appropriate positions in a circumferential direction so as to cover the openings 20.

Description

本発明は、車軸の端部に車輪を回転自在に支持させるための軸受構造に関するものである。   The present invention relates to a bearing structure for rotatably supporting a wheel at an end portion of an axle.

図５はトラック等におけるリヤ側（駆動輪側）の車軸に用いられている従来の軸受構造の一例を示すもので、車軸１（アクスル）の端部に図示しない車輪を取り付けるためのハブ２がユニットベアリング３を介し回転自在に支持されており、このユニットベアリング３は、車軸１の端部に車幅方向外側（図５中の右側）に向けて突設されたアクスルエンド４の周囲に嵌挿されるインナーレース５と、該インナーレース５の外周に転動自在に設置される転動体（コロ）６と、前記インナーレース５の外周に配設されて前記転動体６を転動自在に抱持するアウターレース７と、該アウターレース７及び前記インナーレース５の相互間の隙間を車幅方向両側で塞いでグリス（特に図示せず）を封じ込めるオイルシール８及びダストシール９とを予めユニット化したアッセンブリとなっている。   FIG. 5 shows an example of a conventional bearing structure used for an axle on the rear side (drive wheel side) of a truck or the like. A hub 2 for attaching a wheel (not shown) to the end of the axle 1 (axle) is shown. The unit bearing 3 is rotatably supported via a unit bearing 3, and the unit bearing 3 is fitted around an axle end 4 that protrudes toward the outer side in the vehicle width direction (right side in FIG. 5) at the end of the axle 1. An inner race 5 to be inserted, a rolling element (roller) 6 that is installed on the outer periphery of the inner race 5 so as to be able to roll, and an outer race that is disposed on the outer periphery of the inner race 5 so that the rolling element 6 can be rolled. An outer race 7 to be held, and an oil seal 8 and a dust seal 9 for closing grease between the outer race 7 and the inner race 5 on both sides in the vehicle width direction and containing grease (not shown) in advance. And it has a knit of the assembly.

また、前記ユニットベアリング３は、ハブ２の内周部に対し圧入されてアウターレース７が前記ハブ２の内周面とタイトな嵌め合い状態を成すようになっており、該ハブ２における車幅方向内側（図５中の左側）には、ユニットベアリング３のアウターレース７を突き当てて位置決めするための突き当て部１０が形成されている。   The unit bearing 3 is press-fitted into the inner peripheral portion of the hub 2 so that the outer race 7 is tightly fitted with the inner peripheral surface of the hub 2. An abutting portion 10 for abutting and positioning the outer race 7 of the unit bearing 3 is formed on the inner side in the direction (left side in FIG. 5).

一方、前記インナーレース５は、前記車軸１のアクスルエンド４に対し作業性を考慮した隙間嵌め（ルーズフィット）となっており、前記インナーレース５を前記アクスルエンド４の段差１１に突き当てて反対側からワッシャＷを介してスピンドルナット１２で締め付けることにより固定されるようになっている。   On the other hand, the inner race 5 has a gap fit (loose fit) in consideration of workability with respect to the axle end 4 of the axle 1, and the inner race 5 abuts against the step 11 of the axle end 4 to be opposite. It is fixed by tightening with a spindle nut 12 through a washer W from the side.

更に、車軸１の内部には、図示しない車輪をハブ２と共に回転駆動するためのドライブシャフト１３が車幅方向外側から挿し込まれており、該ドライブシャフト１３の反挿し込み側の端部に備えられたフランジ部分１３ａが図示しないネジにより前記ハブ２の外側面に締結されるようにしてある。   Further, a drive shaft 13 for rotating a wheel (not shown) together with the hub 2 is inserted into the axle 1 from the outside in the vehicle width direction, and is provided at the end of the drive shaft 13 on the opposite insertion side. The flange portion 13a is fastened to the outer surface of the hub 2 with a screw (not shown).

ここで、前記ユニットベアリング３における車幅方向内側のダストシール９は、内部のグリスを封じ込める役割だけでなく、外部からの水や異物の侵入を防ぐ役割も果たすようになっており、また、車幅方向外側のオイルシール８は、車軸１のアクスルエンド４とドライブシャフト１３の軸部分１３ｂとの間の隙間から漏れ出るデフオイル１４がユニットベアリング３内に侵入しないように防ぐ役割も果たすようになっている。   Here, the dust seal 9 on the inner side in the vehicle width direction of the unit bearing 3 serves not only to contain internal grease but also to prevent water and foreign matter from entering from the outside. The oil seal 8 on the outer side in the direction also serves to prevent the differential oil 14 leaking from the gap between the axle end 4 of the axle 1 and the shaft portion 13b of the drive shaft 13 from entering the unit bearing 3. Yes.

尚、図５中における符号の１５はハブ２に取り付けられているタイヤホイールを示し、ここに図示している例では、片輪に２本のタイヤを取り付けるＷタイヤ形式の場合で例示している。   In addition, the code | symbol 15 in FIG. 5 shows the tire wheel attached to the hub 2, and the example shown here has illustrated in the case of the W tire type which attaches two tires to one wheel. .

斯かる軸受構造において、ユニットベアリング３の車幅方向外側に配置されるオイルシール８は、車軸１のアクスルエンド４とドライブシャフト１３の軸部分１３ｂとの間の隙間から漏れ出るデフオイル１４のユニットベアリング３内への侵入を防ぐようにしたものであり、このデフオイル１４が摺動面に供給されていないと、摩耗が促進されて寿命が短くなってしまうため、ハブ２内におけるユニットベアリング３とドライブシャフト１３のフランジ部分１３ａとに挟まれた空間に前記デフオイル１４をオイルシール８の下端部を浸し得るレベルで貯留させておく必要がある。   In such a bearing structure, the oil seal 8 disposed on the outer side in the vehicle width direction of the unit bearing 3 is a unit bearing of the differential oil 14 that leaks from a gap between the axle end 4 of the axle 1 and the shaft portion 13b of the drive shaft 13. 3. If the differential oil 14 is not supplied to the sliding surface, the wear is accelerated and the service life is shortened. Therefore, the unit bearing 3 and the drive in the hub 2 are driven. It is necessary to store the differential oil 14 at a level at which the lower end portion of the oil seal 8 can be immersed in a space sandwiched between the flange portion 13 a of the shaft 13.

ところが、このようにハブ２内にデフオイル１４が溜まっている状態で保守点検時にドライブシャフト１３のフランジ部分１３ａをハブ２の外側面から取り外すと、図６に示す如く、前記ハブ２内に溜まっていたデフオイル１４が流れ出てタイヤホイール１５や作業現場を汚してしまうという不具合があった。尚、保守点検時にハブ２の下方に受皿を配置してデフオイル１４を受けることも考えられるが、そのような受皿の配置は、ドライブシャフト１３の如き長尺な重量物を引き抜く作業の邪魔になり、作業性の大幅な低下を招いてしまう虞れがある。   However, if the flange portion 13a of the drive shaft 13 is removed from the outer surface of the hub 2 during maintenance and inspection with the differential oil 14 remaining in the hub 2 as described above, it remains in the hub 2 as shown in FIG. There was a problem that the differential oil 14 flowed out and contaminated the tire wheel 15 and the work site. Although it is conceivable to place a tray below the hub 2 and receive the differential oil 14 during maintenance inspection, such a placement of the tray interferes with the work of pulling out a long heavy object such as the drive shaft 13. There is a risk that workability will be significantly reduced.

このため、図７に示す如く、前記ハブ２内における前記ユニットベアリング３と前記ドライブシャフト１３のフランジ部分１３ａとに挟まれた空間に、前記ハブ２の内周面に全周に亘り嵌合し且つその半径方向内側に向け壁面を成す環状のダムシール１６を設け、車軸１のアクスルエンド４とドライブシャフト１３の軸部分１３ｂとの間の隙間から漏れ出るデフオイル１４を前記ダムシール１６で堰き止めることが提案されており、このようにすれば、保守点検時にドライブシャフト１３のフランジ部分１３ａをハブ２の外側面から取り外してもデフオイル１４が流れ出ないようにすることができ、タイヤホイール１５や作業現場を汚してしまう虞れを未然に回避することができる。   Therefore, as shown in FIG. 7, the hub 2 is fitted to the inner peripheral surface of the hub 2 over the entire circumference in the space between the unit bearing 3 and the flange portion 13 a of the drive shaft 13. An annular dam seal 16 that forms a wall surface radially inward is provided, and the diff oil 14 leaking from the gap between the axle end 4 of the axle 1 and the shaft portion 13b of the drive shaft 13 is blocked by the dam seal 16. In this way, it is possible to prevent the differential oil 14 from flowing out even if the flange portion 13a of the drive shaft 13 is removed from the outer surface of the hub 2 during maintenance and inspection. The possibility of getting dirty can be avoided in advance.

尚、この種の軸受構造に関連する先行技術文献情報としては下記の特許文献１等がある。   As prior art document information related to this type of bearing structure, there is the following Patent Document 1 and the like.

特開２０１２−４０９７２号公報JP 2012-40972 A

図８に拡大して示す如く、これまでに提案されているダムシール１６では、その主構造を金属環体１７により構成し且つその外周部にゴム１８を加硫接着した構成となっているものが多く、前記ハブ２の内周面における車幅方向外側端に設けた段差部１９に対し、前記ダムシール１６のゴム１８で被包された外周部を嵌合せしめると共に、該外周部を前記段差部１９内でドライブシャフト１３のフランジ部分１３ａにより挾圧保持させることでシール性が発揮されるようにしてあるが、保守点検時には、ゴム１８の経時劣化を考慮してダムシール１６を新品と交換する必要がある。   As shown in FIG. 8 in an enlarged manner, the dam seal 16 proposed so far has a structure in which the main structure is constituted by a metal ring 17 and rubber 18 is vulcanized and bonded to the outer peripheral portion thereof. In many cases, the outer peripheral portion of the dam seal 16 encapsulated with the rubber 18 is fitted to the step portion 19 provided at the outer end in the vehicle width direction on the inner peripheral surface of the hub 2, and the outer peripheral portion is used as the step portion. In FIG. 19, the seal performance is exhibited by holding pressure by the flange portion 13 a of the drive shaft 13. However, at the time of maintenance and inspection, it is necessary to replace the dam seal 16 with a new one in consideration of deterioration over time of the rubber 18. There is.

このため、保守点検時においては、ドライブシャフト１３のフランジ部分１３ａをハブ２の外側面から取り外した後、該ハブ２の下方に受皿を配置してからダムシール１６を取り外すといった措置（ダムシール１６程度の比較的小さくて軽量な部品を取り外す作業での受皿の配置はそれほど作業の邪魔にならない）が採られることになるが、前記ハブ２の内周面にしっかりと嵌まり込んでいるダムシール１６に車幅方向外側へ引き出す力を加えて取り外す際には、該ダムシール１６が勢い良く取り外されて、その取り外しの勢いでデフオイル１４が周囲に飛散する虞れがあり、特に走行直後でデフオイル１４が熱くなっている場合には、作業員に熱いデフオイル１４がかかって火傷する虞れもあった。   For this reason, at the time of maintenance inspection, after removing the flange portion 13a of the drive shaft 13 from the outer surface of the hub 2, a measure such as disposing the tray below the hub 2 and removing the dam seal 16 (about the dam seal 16 or the like) The arrangement of the saucer in the operation of removing the relatively small and light parts does not disturb the operation so much), but the vehicle is attached to the dam seal 16 that is firmly fitted on the inner peripheral surface of the hub 2. When removing the dam seal 16 by applying a pulling force to the outside in the width direction, the dam seal 16 may be removed violently, and the def oil 14 may be scattered around by the detachment force. In such a case, there is a risk that the operator may be burned by the hot differential oil 14.

本発明は上述の実情に鑑みてなしたもので、保守点検時にデフオイルを飛散させることなくダムシールを交換し得るようにした軸受構造を提供することを目的とする。   The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a bearing structure in which a dam seal can be replaced without scattering differential oil during maintenance inspection.

本発明は、車軸の端部に突設されたアクスルエンドに対しユニットベアリングを介してハブを回転自在に外嵌装着し、前記車軸の内部にアクスルエンド側からドライブシャフトを挿し込み且つその反挿し込み側の端部に備えられたフランジ部分を前記ハブの車幅方向外側に締結し、該ハブ内における前記ユニットベアリングと前記ドライブシャフトのフランジ部分とに挟まれた空間に、前記ハブの内周面に全周に亘り嵌合して半径方向内側に向け壁面を成すダムシールを備えた軸受構造において、前記ダムシールを円周方向の適宜位置に開口部を有する金属環体に前記開口部を被覆するようにゴムを加硫接着して構成したことを特徴とするものである。   According to the present invention, a hub is rotatably fitted and attached to an axle end projecting from an end of an axle via a unit bearing, and a drive shaft is inserted into the axle from the axle end side and is reinserted. A flange portion provided at an end on the insertion side is fastened to the outer side in the vehicle width direction of the hub, and an inner periphery of the hub is inserted into a space sandwiched between the unit bearing and the flange portion of the drive shaft in the hub. In a bearing structure including a dam seal that is fitted over the entire circumference and forms a wall surface radially inward, the dam seal is covered with a metal ring having an opening at an appropriate position in the circumferential direction. As described above, the rubber is vulcanized and bonded.

このようにすれば、車軸のアクスルエンドとドライブシャフトの軸部分との間の隙間から漏れ出るデフオイルがダムシールにより堰き止められ、該ダムシールよりも車幅方向外側には流出しなくなるので、保守点検時にドライブシャフトのフランジ部分をハブの外側面から取り外してもデフオイルが流れ出なくなる。   In this way, the diff oil leaking from the gap between the axle end of the axle and the shaft portion of the drive shaft is blocked by the dam seal and will not flow outside the dam seal in the vehicle width direction. Even if the flange part of the drive shaft is removed from the outer surface of the hub, the differential oil does not flow out.

そして、これに続いてダムシールを交換するにあたり、ハブの下方に受皿を配置してから前記ダムシールの金属環体の開口部を被覆しているゴムをカッター等で切除して穴を開け、ここからデフオイルを抜き出した後に前記ダムシールを取り外すと、該ダムシールより車幅方向内側には既にデフオイルがなくなっているので、ダムシールの取り外しの勢いでデフオイルが周囲に飛散する事態が回避されることになる。   Then, when replacing the dam seal, after placing a receiving tray below the hub, cut the rubber covering the opening of the metal ring of the dam seal with a cutter or the like, and make a hole from here. If the dam seal is removed after extracting the diff oil, the diff oil has already disappeared inward in the vehicle width direction from the dam seal, so that the situation where the diff oil scatters around due to the dam seal removal momentum is avoided.

また、本発明においては、ダムシールの外周部にもゴムを加硫接着した構成とする一方、ハブの内周面における車幅方向外側端にダムシールの外周部を嵌合させるための段差部を形成し、該段差部に嵌合させたダムシールの外周部をドライブシャフトのフランジ部分により挾圧保持し得るように構成することが好ましい。   In the present invention, rubber is also vulcanized and bonded to the outer peripheral portion of the dam seal, while a step portion for fitting the outer peripheral portion of the dam seal to the outer end in the vehicle width direction on the inner peripheral surface of the hub is formed. And it is preferable to comprise so that the outer peripheral part of the dam seal fitted to this level | step-difference part can be held under pressure by the flange part of a drive shaft.

このようにすれば、ダムシールの外周部が段差部に嵌合した状態でドライブシャフトのフランジ部分により挾圧保持されるようになっているので、ハブの内周面に対するダムシールの嵌合状態を安定して保持することが可能となり、しかも、ハブの内周面とダムシールの外周部との間からのデフオイルの漏出が防止され、ドライブシャフトのフランジ部分とハブとの締結部からデフオイルが滲み出る虞れがなくなる。尚、このようにハブの内部から外部へのデフオイルの漏出が防止されるだけでなく、外部からの水やダストの混入が防止される効果も得られることは勿論である。   In this way, the dam seal's outer peripheral portion is fitted to the stepped portion and held by the flange portion of the drive shaft so that the dam seal's fitting state with respect to the inner peripheral surface of the hub is stable. In addition, it is possible to prevent the differential oil from leaking between the inner peripheral surface of the hub and the outer peripheral portion of the dam seal, and the differential oil may ooze out from the fastening portion between the flange portion of the drive shaft and the hub. This disappears. Needless to say, not only can the diff oil leak from the inside of the hub to the outside as described above, but also the effect of preventing the entry of water and dust from the outside can be obtained.

上記した本発明の軸受構造によれば、下記の如き種々の優れた効果を奏し得る。   According to the bearing structure of the present invention described above, various excellent effects as described below can be obtained.

（Ｉ）本発明の請求項１に記載の発明によれば、保守点検時にドライブシャフトのフランジ部分をハブの外側面から取り外しても、ダムシールによりデフオイルを堰き止めて車幅方向外側への流出を防ぐことができ、しかも、これに続いてダムシールを交換するにあたっては、該ダムシールの金属環体の開口部を被覆しているゴムをカッター等で切除して穴を開けることでデフオイルを先行して抜き出しておくことができるので、デフオイルを飛散させることなくダムシールを交換することができ、これによりタイヤホイールや作業現場を汚してしまう虞れや、熱いデフオイルが作業員にかかって火傷を負う虞れを未然に回避することができる。   (I) According to the invention described in claim 1 of the present invention, even if the flange portion of the drive shaft is removed from the outer surface of the hub during maintenance inspection, the diff oil is dammed up by the dam seal so as to flow outward in the vehicle width direction. In addition, when replacing the dam seal following this, the diff oil is preceded by cutting the rubber covering the opening of the metal ring of the dam seal with a cutter or the like to make a hole. The dam seal can be replaced without splashing the differential oil because it can be pulled out, which may contaminate the tire wheel and the work site, or the hot differential oil may hit the worker and cause burns Can be avoided in advance.

（ＩＩ）本発明の請求項２に記載の発明によれば、ハブの内周面に対するダムシールの嵌合状態を安定して保持することができると共に、ハブの内周面とダムシールの外周部との間からのデフオイルの漏出を防止することができてドライブシャフトのフランジ部分とハブとの締結部からデフオイルが滲み出る虞れを未然に回避することができ、しかも、外部からの水やダストの混入を防止することもできる。   (II) According to the invention described in claim 2 of the present invention, the fitting state of the dam seal with respect to the inner peripheral surface of the hub can be stably maintained, and the inner peripheral surface of the hub and the outer peripheral portion of the dam seal can be maintained. It is possible to prevent the diff oil from leaking from between the flanges of the drive shaft and to prevent the diff oil from seeping out from the fastening portion between the hub and the hub. Mixing can also be prevented.

本発明を実施する形態の一例を示す断面図である。It is sectional drawing which shows an example of the form which implements this invention. 図１のダムシールの詳細を示す断面図である。It is sectional drawing which shows the detail of the dam seal of FIG. 図１のダムシールを車幅方向外側から見た正面図である。It is the front view which looked at the dam seal of FIG. 1 from the vehicle width direction outer side. 図１の金属環体における開口部の変形例を示す断面図である。It is sectional drawing which shows the modification of the opening part in the metal ring body of FIG. 従来例を示す断面図である。It is sectional drawing which shows a prior art example. 図５のドライブシャフトのフランジ部分を取り外した状態を示す図である。It is a figure which shows the state which removed the flange part of the drive shaft of FIG. 従来提案のダムシールの一例を示す断面図である。It is sectional drawing which shows an example of the conventionally proposed dam seal. 図７のダムシールの詳細を示す断面図である。It is sectional drawing which shows the detail of the dam seal of FIG.

以下本発明の実施の形態を図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１〜図４は本発明を実施する形態の一例を示すもので、図５〜図８と同一の符号を付した部分は同一物を表わしている。   1 to 4 show an example of an embodiment for carrying out the present invention, and parts denoted by the same reference numerals as those in FIGS. 5 to 8 represent the same items.

図１に示す如く、本形態例の軸受構造においては、先に図５〜図８で説明した従来の車軸構造と基本的な構成は同様であり、車軸１の端部に突設されたアクスルエンド４に対しユニットベアリング３を介して回転自在にハブ２を外嵌装着し、前記車軸１の内部にアクスルエンド４側からドライブシャフト１３を挿し込み且つその反挿し込み側の端部に備えられたフランジ部分１３ａを前記ハブ２の車幅方向外側に締結し、該ハブ２内における前記ユニットベアリング３と前記ドライブシャフト１３のフランジ部分１３ａとに挟まれた空間に、前記ハブ２の内周面に全周に亘り嵌合し且つその半径方向内側に向け壁面を成すダムシール１６を備えた軸受構造となっているが、図２に拡大して示す如く、このダムシール１６が、円周方向の適宜位置に開口部２０を有する金属環体２１に前記開口部２０を被覆するようにゴム２２を加硫接着して構成されている点で異なっている。   As shown in FIG. 1, the basic structure of the bearing structure of this embodiment is the same as that of the conventional axle structure described above with reference to FIGS. 5 to 8, and an axle projecting from the end of the axle 1. A hub 2 is externally fitted to the end 4 via a unit bearing 3, and a drive shaft 13 is inserted into the axle 1 from the axle end 4 side and provided at an end portion on the opposite insertion side. The flange portion 13a is fastened to the outer side in the vehicle width direction of the hub 2, and the inner peripheral surface of the hub 2 is inserted into a space between the unit bearing 3 and the flange portion 13a of the drive shaft 13 in the hub 2. The dam seal 16 includes a dam seal 16 that fits over the entire circumference and forms a wall surface inward in the radial direction. As shown in an enlarged view in FIG. Place It is different rubber 22 so as to cover the opening 20 in the metal ring member 21 having an opening 20 in that it is constituted by vulcanization bonded to.

ここで、本形態例における金属環体２１の開口部２０は、図３に示す如く、前記金属環体２１の円周方向複数箇所（図示例では８箇所）に穴を開けることで形成されており、車軸１の回転位置にかかわらず何れかの開口部２０が最下部に位置するようになっているが、例えば、図４に示す如く、前記金属環体２１の円周方向複数箇所（図示例では８箇所）に、その内周部側から外周部側に向けて切欠きを入れることで開口部２０を形成するようにしても良い。   Here, the opening 20 of the metal ring body 21 in this embodiment is formed by making holes at a plurality of circumferential positions (eight positions in the illustrated example) of the metal ring body 21 as shown in FIG. Any one of the openings 20 is positioned at the lowermost position regardless of the rotational position of the axle 1. For example, as shown in FIG. You may make it form the opening part 20 by making a notch from the inner peripheral part side toward the outer peripheral part side in eight places in the example of illustration.

また、ここに図示している例では、ダムシール１６の外周部にもゴム２２を加硫接着した構成となっており、ハブ２の内周面における車幅方向外側端に形成した段差部１９に前記ダムシール１６の外周部を嵌合させ、該ダムシール１６の外周部をドライブシャフト１３のフランジ部分１３ａにより挾圧保持し得るようになっている。   In the example shown here, rubber 22 is also vulcanized and bonded to the outer peripheral portion of the dam seal 16, and the step portion 19 formed at the outer end in the vehicle width direction on the inner peripheral surface of the hub 2 is provided. The outer peripheral portion of the dam seal 16 is fitted, and the outer peripheral portion of the dam seal 16 can be held under pressure by the flange portion 13 a of the drive shaft 13.

このようにすれば、車軸１のアクスルエンド４とドライブシャフト１３の軸部分１３ｂとの間の隙間から漏れ出るデフオイル１４がダムシール１６により堰き止められ、該ダムシール１６よりも車幅方向外側には流出しなくなるので、保守点検時にドライブシャフト１３のフランジ部分１３ａをハブ２の外側面から取り外してもデフオイル１４が流れ出なくなる。   In this way, the differential oil 14 leaking from the gap between the axle end 4 of the axle 1 and the shaft portion 13b of the drive shaft 13 is blocked by the dam seal 16 and flows out of the dam seal 16 outward in the vehicle width direction. Therefore, even if the flange portion 13a of the drive shaft 13 is removed from the outer surface of the hub 2 during maintenance inspection, the differential oil 14 does not flow out.

そして、これに続いてダムシール１６を交換するにあたり、ハブ２の下方に受皿を配置してから前記ダムシール１６の金属環体２１の開口部２０を被覆しているゴム２２をカッター等で切除して穴を開け、ここからデフオイル１４を抜き出した後に前記ダムシール１６を取り外すと、該ダムシール１６より車幅方向内側には既にデフオイル１４がなくなっているので、ダムシール１６の取り外しの勢いでデフオイル１４が周囲に飛散する事態が回避されることになる。   Then, when replacing the dam seal 16, after placing a tray below the hub 2, the rubber 22 covering the opening 20 of the metal ring 21 of the dam seal 16 is cut off with a cutter or the like. When the dam seal 16 is removed after opening the hole and extracting the differential oil 14 from here, the differential oil 14 has already disappeared inside the dam seal 16 in the vehicle width direction. The situation of scattering will be avoided.

また、ダムシール１６の外周部が段差部１９に嵌合した状態でドライブシャフト１３のフランジ部分１３ａにより挾圧保持されるようになっているので、ハブ２の内周面に対するダムシール１６の嵌合状態を安定して保持することが可能となり、しかも、ハブ２の内周面とダムシール１６の外周部との間からのデフオイル１４の漏出が防止され、ドライブシャフト１３のフランジ部分１３ａとハブ２との締結部からデフオイル１４が滲み出る虞れがなくなる。尚、このようにハブ２の内部から外部へのデフオイル１４の漏出が防止されるだけでなく、外部からの水やダストの混入が防止される効果も得られることは勿論である。   In addition, since the outer peripheral portion of the dam seal 16 is held under pressure by the flange portion 13a of the drive shaft 13 in a state where the outer peripheral portion of the dam seal 16 is fitted to the step portion 19, the fitted state of the dam seal 16 with respect to the inner peripheral surface of the hub 2 Can be held stably, and the leakage of the differential oil 14 from between the inner peripheral surface of the hub 2 and the outer peripheral portion of the dam seal 16 is prevented, and the flange portion 13a of the drive shaft 13 and the hub 2 are prevented from leaking. There is no possibility that the differential oil 14 oozes from the fastening portion. Of course, not only the leakage of the differential oil 14 from the inside of the hub 2 to the outside is prevented, but also the effect of preventing the entry of water and dust from the outside can be obtained.

従って、上記形態例によれば、保守点検時にドライブシャフト１３のフランジ部分１３ａをハブ２の外側面から取り外しても、ダムシール１６によりデフオイル１４を堰き止めて車幅方向外側への流出を防ぐことができ、しかも、これに続いてダムシール１６を交換するにあたっては、該ダムシール１６の金属環体２１の開口部２０を被覆しているゴム２２をカッター等で切除して穴を開けることでデフオイル１４を先行して抜き出しておくことができるので、デフオイル１４を飛散させることなくダムシール１６を交換することができ、これによりタイヤホイールや作業現場を汚してしまう虞れや、熱いデフオイル１４が作業員にかかって火傷を負う虞れを未然に回避することができる。   Therefore, according to the above embodiment, even if the flange portion 13a of the drive shaft 13 is removed from the outer surface of the hub 2 at the time of maintenance inspection, the diff oil 14 is blocked by the dam seal 16 and prevented from flowing out in the vehicle width direction. In addition, when the dam seal 16 is replaced subsequently, the differential oil 14 is removed by cutting the rubber 22 covering the opening 20 of the metal ring 21 of the dam seal 16 with a cutter or the like to make a hole. Since it can be extracted in advance, the dam seal 16 can be replaced without splashing the differential oil 14, which may contaminate the tire wheel and the work site, and the hot differential oil 14 is applied to the worker. The risk of burns can be avoided.

また、ハブ２の内周面に対するダムシール１６の嵌合状態を安定して保持することができると共に、ハブ２の内周面とダムシール１６の外周部との間からのデフオイル１４の漏出を防止することができてドライブシャフト１３のフランジ部分１３ａとハブ２との締結部からデフオイル１４が滲み出る虞れを未然に回避することができ、しかも、外部からの水やダストの混入を防止することもできる。   Further, the fitting state of the dam seal 16 with respect to the inner peripheral surface of the hub 2 can be stably maintained, and the leakage of the differential oil 14 from between the inner peripheral surface of the hub 2 and the outer peripheral portion of the dam seal 16 is prevented. This can prevent the possibility that the differential oil 14 oozes out from the fastening portion between the flange portion 13a of the drive shaft 13 and the hub 2, and also prevents the entry of water and dust from the outside. it can.

尚、本発明の軸受構造は、上述の形態例にのみ限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   Note that the bearing structure of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

１ 車軸
２ ハブ
３ ユニットベアリング
４ アクスルエンド
１３ ドライブシャフト
１３ａ フランジ部分
１６ ダムシール
１９ 段差部
２０ 開口部
２１ 金属環体
２２ ゴム 1 Axle 2 Hub 3 Unit bearing 4 Axle end 13 Drive shaft 13a Flange part 16 Dam seal 19 Step part 20 Opening part 21 Metal ring 22 Rubber

Claims (2)

車軸の端部に突設されたアクスルエンドに対しユニットベアリングを介してハブを回転自在に外嵌装着し、前記車軸の内部にアクスルエンド側からドライブシャフトを挿し込み且つその反挿し込み側の端部に備えられたフランジ部分を前記ハブの車幅方向外側に締結し、該ハブ内における前記ユニットベアリングと前記ドライブシャフトのフランジ部分とに挟まれた空間に、前記ハブの内周面に全周に亘り嵌合して半径方向内側に向け壁面を成すダムシールを備えた軸受構造において、前記ダムシールを円周方向の適宜位置に開口部を有する金属環体に前記開口部を被覆するようにゴムを加硫接着して構成したことを特徴とする軸受構造。   A hub is rotatably fitted on the axle end projecting from the axle end via a unit bearing, and the drive shaft is inserted into the axle from the axle end side, and the end on the opposite insertion side is inserted. A flange portion provided on the hub portion is fastened to the outer side in the vehicle width direction of the hub, and a space between the unit bearing and the flange portion of the drive shaft in the hub is arranged on the inner peripheral surface of the hub. In a bearing structure including a dam seal that is fitted over the wall and forms a wall surface inward in the radial direction, rubber is applied so that the dam seal is covered with a metal ring having an opening at an appropriate position in the circumferential direction. A bearing structure characterized by being vulcanized and bonded. ダムシールの外周部にもゴムを加硫接着した構成とする一方、ハブの内周面における車幅方向外側端にダムシールの外周部を嵌合させるための段差部を形成し、該段差部に嵌合させたダムシールの外周部をドライブシャフトのフランジ部分により挾圧保持し得るように構成したことを特徴とする請求項１に記載の軸受構造。   While the rubber seal is also vulcanized and bonded to the outer periphery of the dam seal, a step portion for fitting the outer periphery of the dam seal is formed at the outer end in the vehicle width direction on the inner peripheral surface of the hub, and fitted to the step portion. The bearing structure according to claim 1, wherein the outer peripheral portion of the combined dam seal is configured to be held under pressure by the flange portion of the drive shaft.
JP2012134591A 2012-06-14 2012-06-14 Bearing structure Pending JP2013256246A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015194216A (en) * 2014-03-31 2015-11-05 Ntn株式会社 Extraction structure of conical roller bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015194216A (en) * 2014-03-31 2015-11-05 Ntn株式会社 Extraction structure of conical roller bearing

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