JP2023032918A - sealing device - Google Patents

sealing device Download PDF

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JP2023032918A
JP2023032918A JP2021139292A JP2021139292A JP2023032918A JP 2023032918 A JP2023032918 A JP 2023032918A JP 2021139292 A JP2021139292 A JP 2021139292A JP 2021139292 A JP2021139292 A JP 2021139292A JP 2023032918 A JP2023032918 A JP 2023032918A
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sealing device
peripheral surface
ring
seal
vehicle body
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しおり 荒川
Shiori Arakawa
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Uchiyama Manufacturing Corp
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Uchiyama Manufacturing Corp
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  • Gasket Seals (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

To provide a sealing device which hardly comes off and is stabilized in attachment while suppressing the flow-in of differential oil.SOLUTION: In a vehicle bearing device 100 comprising a rolling bearing having an outer ring 2 and an inner ring 3 for rotatably supporting wheels, a sealing device 10 for sealing a sealed space S in which an inner-ring step part 31 formed at an internal peripheral corner part of a vehicle body internal end face 30 of the inner ring, and an axle pipe step part are formed while abutting on each other comprises: a core grid 11 having a fitment cylinder part 11a fit to an internal peripheral face 31a in an axial direction, and a support circular ring part 11b extending inward in a radial direction from one end part 11aa of the fitment cylinder part; and an annular seal member 12 integrally arranged at the support circular ring part and composed of an elastic body extending in the axial direction. A vehicle body internal side of the fitment cylinder part is formed as a metal exposure region, and the seal member has a first seal part 12a which elastically contacts with an internal peripheral face 31b in the radial direction, and a second seal part 12b which elastically contacts with an external peripheral face 40b in the radial direction.SELECTED DRAWING: Figure 2

Description

本発明は、車体内部に配備されるデファレンシャルギアに連結された車軸が挿通される車軸管に形成された車軸管段差部と、車軸管に外嵌され車輪を回転自在に支持する転がり軸受の内輪に形成された内輪段差部とが突き合わされて設けられる被密封空間を密封する密封装置に関する。 The present invention relates to an axle tube stepped portion formed in an axle tube through which an axle connected to a differential gear disposed inside a vehicle body is inserted, and an inner ring of a rolling bearing that is fitted on the axle tube and supports a wheel rotatably. The present invention relates to a sealing device that seals a sealed space that is provided by abutting an inner ring stepped portion formed in the .

従来、車体内部に配備されるデファレンシャルギアケース内に充填されるデフオイルが、車軸と車軸管との間の空間を介して車輪側に流出し、車軸管と転がり軸受との隙間に流入するおそれがあるため、上記被密封空間を設け、密封装置で密封することがなされている。
このようなデフオイルの流入を防止する密封装置としては、例えば特許文献1~3が挙げられる。
Conventionally, there is a risk that the differential oil that fills the differential gear case inside the vehicle body will flow out to the wheel side through the space between the axle and the axle tube, and flow into the gap between the axle tube and the rolling bearing. Therefore, the space to be sealed is provided and sealed with a sealing device.
Examples of sealing devices for preventing the inflow of differential oil include those disclosed in Patent Documents 1 to 3.

特開2015-16778号公報JP 2015-16778 A 特開2017-20610号公報Japanese Patent Application Laid-Open No. 2017-20610 特許第5252489号公報Japanese Patent No. 5252489

ところで、このような車両に組み込まれる転がり軸受は、車両整備等の際に取り外される場合があるが、密封装置はそのような場合でも容易に外れない構成が求められる。また密封装置を所定の位置に装着する際には、安定して圧入できる構成が求められる。
上記特許文献1、2に記載の密封装置は、いずれも密封装置が嵌まり込むように凹所を内輪側に加工し形成することを要するものであった。また上記特許文献3に記載の密封装置は、所定の位置に装着する際に、押圧面に弾性部材が配されているため、嵌合部位を直接押圧できる構成ではない。
By the way, the rolling bearing incorporated in such a vehicle may be removed during vehicle maintenance or the like, and the sealing device is required to have a structure that does not come off easily even in such a case. In addition, when the sealing device is attached to a predetermined position, a structure that can be stably press-fitted is required.
Both of the sealing devices described in Patent Documents 1 and 2 require processing and forming a recess on the inner ring side so that the sealing device can be fitted. Further, the sealing device described in Patent Document 3 does not have a configuration in which the fitting portion can be directly pressed when the sealing device is attached to a predetermined position because an elastic member is arranged on the pressing surface.

本発明は、上記実情に鑑みてなされたものであり、デフオイルの流入を抑制しつつ、外れ難く、安定して装着可能な密封装置を提供することを目的としている。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a sealing device that suppresses the inflow of differential oil, is difficult to come off, and can be mounted stably.

前記目的を達成するために、本発明に係る密封装置は、車体内部に配備されるデファレンシャルギアに連結された車軸が挿通される車軸管と、前記車軸管の外周面に形成された車軸管段差部に外嵌され車輪を回転自在に支持する外輪及び内輪を有する転がり軸受とを備える車両用軸受装置において、前記車体内部側における前記内輪の内周角部に形成された内輪段差部と、前記車軸管段差部とが突き合わされて設けられる被密封空間を密封する密封装置であって、前記内輪段差部は、前記車軸の軸方向に沿った軸方向内周面と、径方向に沿った径方向内周面とを有し、前記車軸管段差部は、前記軸方向に沿った軸方向外周面と、前記径方向に沿った径方向外周面とを有しており、前記軸方向内周面に嵌合される嵌合円筒部と、前記嵌合円筒部の一端部から前記径方向内方に延びる支持円輪部とを有する芯金と、前記支持円輪部に一体的に設けられ、前記軸方向に延びる弾性部材からなる環状のシール部材とを備え、前記嵌合円筒部の前記車体内部側は、金属の露出部位とされ、前記シール部材は、前記径方向内周面に弾接する第1シール部と、前記径方向外周面に弾接する第2シール部とを有していることを特徴とする。 To achieve the above object, the sealing device according to the present invention comprises an axle tube through which an axle connected to a differential gear disposed inside a vehicle body is inserted; and an axle tube step formed on the outer peripheral surface of the axle tube. a rolling bearing having an outer ring and an inner ring that are fitted on the outside of a part and rotatably support a wheel, wherein: A sealing device that seals a space to be sealed provided by abutting an axle tube stepped portion, wherein the inner ring stepped portion includes an axial inner peripheral surface along the axial direction of the axle and a diameter along the radial direction of the axle. the axle tube step portion has an axially outer peripheral surface along the axial direction and a radially outer peripheral surface along the radial direction; a core metal having a fitting cylindrical portion fitted to the surface and a circular supporting ring portion extending radially inward from one end of the cylindrical fitting portion; and an annular sealing member made of an elastic member extending in the axial direction, the inner side of the vehicle body of the fitting cylindrical portion is an exposed metal portion, and the sealing member is elastic to the radially inner peripheral surface. It is characterized by having a first seal portion in contact and a second seal portion in elastic contact with the radially outer peripheral surface.

本発明に係る密封装置は、上述のような構成としたことで、デフオイルの流入を抑制しつつ、外れ難く、安定して装着できる。 Since the sealing device according to the present invention is configured as described above, it is possible to stably attach the sealing device while suppressing the inflow of differential oil and preventing it from coming off easily.

本発明の第1実施形態に係る密封装置の一例が組み込まれる車両用軸受装置の一例を模式的に示す概略縦断面図である。1 is a schematic longitudinal sectional view schematically showing an example of a vehicle bearing device into which an example of a sealing device according to a first embodiment of the invention is incorporated; FIG. (a)~(c)は、同密封装置を同車両用軸受装置に組み付ける要領を説明するための図であり、(c)は図1におけるX部に対応させた一部破断概略拡大縦断面図である。(a) to (c) are diagrams for explaining how to assemble the same sealing device to the same vehicle bearing device, and (c) is a partially broken schematic enlarged vertical cross section corresponding to the X part in FIG. It is a diagram. 同実施形態に係る密封装置の変形例を示す一部破断概略拡大縦断面図である。It is a partially broken schematic enlarged longitudinal cross-sectional view which shows the modification of the sealing device which concerns on the same embodiment. (a)は本発明の第2実施形態に係る密封装置を示す一部破断概略拡大縦断面図であり、(b)は同実施形態に係る密封装置の変形例を示す一部破断概略拡大縦断面図である。(a) is a partially broken schematic enlarged longitudinal sectional view showing a sealing device according to a second embodiment of the present invention, and (b) is a partially broken schematic enlarged longitudinal sectional view showing a modified example of the sealing device according to the same embodiment. It is a plan view. 本発明の第3実施形態に係る密封装置を示す一部破断概略拡大縦断面図である。It is a partially broken schematic enlarged vertical cross-sectional view showing a sealing device according to a third embodiment of the present invention.

以下に、本発明の実施の形態について、図面を参照しながら説明する。
なお、一部の図では、他図に付している詳細な符号の一部を省略している。
本実施形態に係る密封装置10は、図1及び図2(c)等に示すように車両用軸受装置100において、車体内部側の内輪3の端面30の内周角部に形成された内輪段差部31と、車軸管段差部40とが突き合わされて設けられる被密封空間Sを密封する密封装置である。車両用軸受装置100は、車体内部に配備されるデファレンシャルギア(不図示)に連結された車軸5が挿通される車軸管4と、車軸管4の外周面4aに形成された車軸管段差部40に外嵌され車輪を回転自在に支持する外輪2及び内輪3,3を有する転がり軸受1とを備える。内輪段差部31は、軸L方向に沿った軸方向内周面31aと、径方向に沿った径方向内周面31bとを有し、車軸管段差部40は、軸L方向に沿った軸方向外周面40aと、径方向に沿った径方向外周面40bとを有している。密封装置10は、軸方向内周面31aに嵌合される嵌合円筒部11aと、嵌合円筒部11aの一端部11aaから径方向内方に延びる支持円輪部11bとを有する芯金11と、支持円輪部11bに一体的に設けられ、軸L方向に延びる弾性部材からなる環状のシール部材12とを備える。芯金11の嵌合円筒部11aの車体内部側は、金属の露出部位とされ、シール部材12は、径方向内周面31bに弾接する第1シール部12aと、径方向外周面40bに弾接する第2シール部12bとを有している。以下、詳述する。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
It should be noted that some of the detailed reference numerals attached to other drawings are omitted in some of the drawings.
As shown in FIGS. 1 and 2(c), the sealing device 10 according to the present embodiment is an inner ring stepped portion formed at an inner peripheral corner portion of an end face 30 of an inner ring 3 on the inside of the vehicle body in the vehicle bearing device 100. It is a sealing device for sealing a sealed space S provided by abutting the portion 31 and the axle tube step portion 40 . The vehicle bearing device 100 includes an axle tube 4 through which an axle 5 connected to a differential gear (not shown) disposed inside a vehicle body is inserted, and an axle tube step portion 40 formed on an outer peripheral surface 4 a of the axle tube 4 . A rolling bearing 1 having an outer ring 2 and inner rings 3, 3 for rotatably supporting a wheel. The inner ring stepped portion 31 has an axial inner peripheral surface 31a along the axis L direction and a radial inner peripheral surface 31b along the radial direction. It has a directional outer peripheral surface 40a and a radial outer peripheral surface 40b along the radial direction. The sealing device 10 includes a core metal 11 having a fitting cylindrical portion 11a fitted to an axial inner peripheral surface 31a and a supporting ring portion 11b extending radially inward from one end portion 11aa of the fitting cylindrical portion 11a. and an annular seal member 12 formed integrally with the support ring portion 11b and made of an elastic member extending in the axis L direction. The inside of the vehicle body of the fitting cylindrical portion 11a of the core metal 11 is an exposed metal portion, and the seal member 12 is provided with a first seal portion 12a elastically contacting the radial inner peripheral surface 31b and an elastic radial outer peripheral surface 40b. It has a second seal portion 12b in contact therewith. Details will be described below.

まずは図1、図2を参照しながら第1実施形態に係る密封装置10を説明する。
図1では、密封装置10が装着される車両用軸受装置100の一例として、トラックやバス等の重量のある車両に使用される全浮動式とした車軸5(アクスルシャフト)によってホイールを駆動する軸受装置を示している。この車両用軸受装置100は、車軸5が挿通される車軸管4(アクスルハウジング)と、複数の円錐ころ9,9を有する転がり軸受1と、ハブ輪6とを備えている。ハブ輪6は車軸5のフランジ50にボルト7によって連結され、ハブ輪6にデファレンシャルギアの動力が伝達される。またハブ輪6には、転がり軸受1が内嵌され、転がり軸受1によりハブ輪6が回転自在に支持される。転がり軸受1は、ハブ輪6に内嵌されるとともに、車軸管4の外周面4aの一端部に形成された車軸管段差部40に外嵌される。具体的には転がり軸受1は、車軸管4の一端部から車軸管段差部40に外嵌めされ、車体内部側の内輪3の端面30が車軸管段差部40の径方向外周面40bに突き当たるまで嵌入し、その状態で、車輪側の内輪3の端面32に環状の固定部材8を締め付け固定される。図1に示すような全浮動式の場合、ホイールはハブ輪6と転がり軸受1によって、車軸管4に取り付けられており、自動車の荷重は、車軸管4で支えられるため車軸5へ加わる荷重を分散させることができ、車軸5はホイールに関係なく取り外すことが出来る構造になっている。よって、車軸5にねじれや亀裂がないか等、点検する際にはボルト7を外せば、車軸5を抜き出して取り外すことができる。また転がり軸受1を交換、点検する際には、ボルト7及び固定部材8を外せば、転がり軸受1を車軸管4から取り外せる構造となっている。
なお、図1等において、紙面左側は車輪側、紙面右側は車体内部側(デファレンシャルギア側)を示している。
First, a sealing device 10 according to a first embodiment will be described with reference to FIGS. 1 and 2. FIG.
In FIG. 1, as an example of a vehicle bearing device 100 to which the sealing device 10 is attached, a bearing for driving a wheel by a fully floating axle 5 (axle shaft) used in heavy vehicles such as trucks and buses is shown. showing the device. This vehicle bearing device 100 includes an axle tube 4 (axle housing) through which an axle 5 is inserted, a rolling bearing 1 having a plurality of tapered rollers 9 , 9 , and a hub wheel 6 . The wheel hub 6 is connected to the flange 50 of the axle 5 by means of bolts 7 , and the power of the differential gear is transmitted to the wheel hub 6 . A rolling bearing 1 is fitted in the hub ring 6 and the hub ring 6 is rotatably supported by the rolling bearing 1 . The rolling bearing 1 is internally fitted to the hub wheel 6 and externally fitted to an axle tube stepped portion 40 formed at one end of the outer peripheral surface 4 a of the axle tube 4 . Specifically, the rolling bearing 1 is externally fitted from one end of the axle tube 4 to the axle tube stepped portion 40 until the end surface 30 of the inner ring 3 on the inside of the vehicle body abuts against the radial outer peripheral surface 40b of the axle tube stepped portion 40. In this state, the annular fixing member 8 is tightened and fixed to the end surface 32 of the inner ring 3 on the wheel side. In the case of a fully floating type as shown in FIG. It can be distributed and the axle 5 is designed to be removable regardless of the wheel. Therefore, when checking whether the axle 5 is twisted or cracked, the axle 5 can be pulled out and removed by removing the bolt 7 . Further, when the rolling bearing 1 is replaced or inspected, the rolling bearing 1 can be removed from the axle tube 4 by removing the bolt 7 and the fixing member 8 .
In FIG. 1 and the like, the left side of the paper indicates the wheel side, and the right side of the paper indicates the inside of the vehicle body (differential gear side).

転がり軸受1は、外輪2と、一対の内輪3,3と、転動体として配される複数の円錐ころ9,9と、円錐ころ9,9を保持する保持器90,90と、外輪2と内輪3,3との間を密封するシール装置20,21とを有する。外輪2、一対の内輪3,3、円錐ころ9,9は金属材からなり、複数の円錐ころ9,9が、保持器90,90に保持された状態で、外輪2の軌道面2a、内輪3,3の軌道面3a,3aを転動可能に介装されている。 A rolling bearing 1 includes an outer ring 2, a pair of inner rings 3, 3, a plurality of tapered rollers 9, 9 arranged as rolling elements, retainers 90, 90 for holding the tapered rollers 9, 9, and an outer ring 2. It has sealing devices 20, 21 for sealing between the inner rings 3, 3. The outer ring 2, the pair of inner rings 3, 3, and the tapered rollers 9, 9 are made of metal material. 3, 3 raceway surfaces 3a, 3a are interposed so as to be able to roll.

このような構造の車両用軸受装置100では、車両が旋回する際にかかる遠心力等によって車軸5の外周と車軸管4の内周との隙間を伝って、図1の2点鎖線の矢印で示すようにデフオイルが、フランジ50の内側に流れてくる。このため、転がり軸受1の内部空間へ転がり軸受1の車輪側からデフオイルが浸入しないように軸受シール装置21が設けられている。またデフオイルは、車輪側だけにとどまらず、内輪3,3と車軸管4との嵌め合い部位にも流入し車体内部側へも浸入するため、転がり軸受1の車体内部側にも軸受シール装置20が設けられている。またこれらシール装置20,21は、デフオイルの浸入だけでなく、転がり軸受1の内部空間に封入されたグリースの外部漏出、外部からの泥水等の浸入も防止するよう機能する。
ここでデフオイルとはデファレンシャルギアを滑らかに駆動させるために使用されるオイルのことであり、所定量が充填されるか定期的に補充する必要があるオイルである。
In the vehicle bearing device 100 having such a structure, the centrifugal force or the like applied when the vehicle turns moves along the gap between the outer circumference of the axle 5 and the inner circumference of the axle tube 4, as indicated by the two-dot chain line arrow in FIG. Differential oil flows inside the flange 50 as shown. For this reason, a bearing seal device 21 is provided to prevent differential oil from entering the internal space of the rolling bearing 1 from the wheel side of the rolling bearing 1 . In addition, the differential oil flows not only into the wheel side but also into the fitting portion between the inner rings 3, 3 and the axle tube 4 and into the inside of the vehicle body. is provided. These sealing devices 20 and 21 function to prevent not only the infiltration of differential oil, but also the leakage of grease sealed in the internal space of the rolling bearing 1 and the infiltration of muddy water from the outside.
Here, the differential oil is oil used for smoothly driving the differential gear, and is oil that needs to be filled with a predetermined amount or periodically replenished.

本実施形態に係る密封装置10は、軸受シール装置20,21に加えて、デフオイルの車体内部側への流入を抑制するものであり、内輪3の車体内部側の内周角部に形成された内輪段差部31と、車軸管段差部40とが突き合わされて設けられる被密封空間S(図2(c)参照)に設けられる。被密封空間密封Sは、図2(c)に示すように内輪段差部31と、車軸管段差部40とで構成される隙間空間であり、軸方向内周面31aと、径方向内周面31bと、軸方向外周面40aと、径方向外周面40bとで囲まれて構成される。 The sealing device 10 according to the present embodiment, in addition to the bearing sealing devices 20 and 21, suppresses the inflow of differential oil into the vehicle body interior side. It is provided in a sealed space S (see FIG. 2(c)) provided by the inner ring stepped portion 31 and the axle tube stepped portion 40 butted against each other. The sealed space S is, as shown in FIG. 31b, an axial outer peripheral surface 40a, and a radial outer peripheral surface 40b.

密封装置10は、芯金11とシール部材12とを備えている。芯金11はSPCC又はSUS等の鋼板をプレス加工して形成され、図2(a)等に示すように、片側の断面が略L字形状の円筒形とされる。芯金11は、嵌合円筒部11aと支持円輪部11bと屈曲部11cとを有する。嵌合円筒部11aは、軸方向内周面31aに嵌合される円筒状部材である。支持円輪部11bは嵌合円筒部11aの車輪側の一端部11aaから径方向内方に延出して形成される。屈曲部11cは、芯金11の屈曲部位のことであり、支持円輪部11bは、嵌合円筒部11aの車輪側の端部11から屈曲する屈曲部11cを介して径方向に延出して形成されている。略90°に折れ曲がった屈曲部11cとすることで、円筒嵌合部11aの長さを充分に確保しつつ、支持円輪部11bの位置を被密封空間Sの大きさ等に応じて柔軟に且つ容易に設定することができる。 The sealing device 10 includes a metal core 11 and a sealing member 12 . The core metal 11 is formed by pressing a steel plate such as SPCC or SUS, and as shown in FIG. The cored bar 11 has a fitting cylindrical portion 11a, a supporting ring portion 11b, and a bent portion 11c. The fitting cylindrical portion 11a is a cylindrical member fitted to the axial inner peripheral surface 31a. The support ring portion 11b is formed by extending radially inward from one wheel-side end portion 11aa of the fitting cylindrical portion 11a. The bent portion 11c is a bent portion of the core bar 11, and the support ring portion 11b radially extends from the wheel-side end portion 11 of the fitting cylindrical portion 11a through the bent portion 11c. formed. By forming the bent portion 11c bent at approximately 90°, the length of the cylindrical fitting portion 11a is sufficiently secured, and the position of the support ring portion 11b can be flexibly adjusted according to the size of the space S to be sealed. and can be easily set.

芯金11の嵌合円筒部11aの車体内部側の端部11abは、金属の露出部位とされる。このように芯金11の嵌合円筒部11aの車体側は、弾性材が配されていない金属の露出部位とされているので、内輪段差部31の軸方向内周面31aに芯金11を嵌合させる際、この露出部位を治具等により図2(a)及び図2(b)の白抜矢印で示すように直接押圧することができる。また嵌合円筒部11aと軸方向内周面31aはいずれも金属材からなるため、金属同士の嵌合となり、より嵌合力を強固にできる。よって、嵌合円筒部11aの軸方向内周面31aへの圧入が安定し、密封装置10を適正な所定の位置に容易に固定することができる。また上記のように嵌合円筒部11aを内輪段差部31に強固に固定することができるので、内輪段差部31側に位置ずれ防止のための突起や溝を形成する等の加工や密封装置の構造を複雑することが不要である。また芯金11は嵌合円筒部11aによって、軸方向内周面31aに強固に嵌合され、その嵌合力をシール部材12の反力より強くすることで、車軸管4に転がり軸受1を組み付ける際や転がり軸受1を車軸管4から取り外す際でも、芯金11が外れて密封装置10が脱落することを抑制できる。さらに芯金11の嵌合力が強めることができるので、シール部材12の反力が多少強い設計となっても、密封装置10のずれを防止することができる。 An end portion 11ab of the fitting cylindrical portion 11a of the cored bar 11 on the vehicle body inner side is an exposed metal portion. As described above, the body side of the fitting cylindrical portion 11 a of the core metal 11 is an exposed portion of the metal where the elastic material is not arranged. At the time of fitting, the exposed portion can be directly pressed by a jig or the like as shown by the white arrows in FIGS. 2(a) and 2(b). In addition, since both the fitting cylindrical portion 11a and the axial inner peripheral surface 31a are made of a metal material, the fitting is performed between metals, and the fitting force can be strengthened. Therefore, the press-fitting of the fitting cylindrical portion 11a into the axial inner peripheral surface 31a is stabilized, and the sealing device 10 can be easily fixed at a proper predetermined position. In addition, since the fitting cylindrical portion 11a can be firmly fixed to the inner ring stepped portion 31 as described above, processing such as forming projections or grooves for preventing misalignment on the inner ring stepped portion 31 side, or modification of the sealing device can be performed. No need to complicate the structure. Further, the core bar 11 is firmly fitted to the axial inner peripheral surface 31a by the fitting cylindrical portion 11a, and the fitting force is made stronger than the reaction force of the seal member 12, thereby assembling the rolling bearing 1 to the axle tube 4. Even when the rolling bearing 1 is removed from the axle tube 4, it is possible to prevent the core metal 11 from coming off and the sealing device 10 from falling off. Furthermore, since the fitting force of the cored bar 11 can be strengthened, even if the reaction force of the seal member 12 is designed to be somewhat strong, it is possible to prevent the sealing device 10 from slipping.

シール部材12は、ゴム等の弾性材からなり、芯金11に対して加硫接着されることで一体成型されている。シール部材12は、芯金11の支持円輪部11bに一体的に設けられ、軸L方向に延びるように形成され、径方向内周面31b及び径方向外周面40bに弾接した際に締め代(図2(c)の2点鎖線参照)をもって弾性変形するよう形成される。シール部材12は、径方向内周面31bに弾接する第1シール部12aと、径方向外周面40bに弾接する第2シール部12bと、第1シール部12aと第2シール部12bとの間に介在する第3シール部12cとを有している。シール部材12は、片側の断面は扁平な略台形状に形成されており、外径側よりも内径側(第3シール部12c側)の面が小さく形成され、第3シール部12cから第1シール部12aの軸L方向の先端部12aa、第3シール部11cから第2シール部12bの軸L方向の先端部12baに向けてそれぞれテーパー状の傾斜面12ab,12bbが形成されている。第1シール部12aの先端部12aaと第2シール部12bの先端部12baとは軸L方向に同じ位置になるよう形成されている(図2(a)の1点鎖線d1参照)。 The sealing member 12 is made of an elastic material such as rubber, and is integrally formed by being vulcanized and bonded to the core metal 11 . The seal member 12 is provided integrally with the support ring portion 11b of the cored bar 11, is formed to extend in the direction of the axis L, and tightens when it is in elastic contact with the radially inner peripheral surface 31b and the radially outer peripheral surface 40b. It is formed so as to be elastically deformed with a certain length (see two-dot chain line in FIG. 2(c)). The seal member 12 includes a first seal portion 12a in elastic contact with the radial inner peripheral surface 31b, a second seal portion 12b in elastic contact with the radial outer peripheral surface 40b, and a gap between the first seal portion 12a and the second seal portion 12b. and a third seal portion 12c interposed in the . The seal member 12 has a flat, substantially trapezoidal cross-section on one side. Tapered inclined surfaces 12ab and 12bb are formed from the tip portion 12aa of the seal portion 12a in the direction of the axis L and the third seal portion 11c toward the tip portion 12ba of the second seal portion 12b in the direction of the axis L, respectively. The tip portion 12aa of the first seal portion 12a and the tip portion 12ba of the second seal portion 12b are formed so as to be at the same position in the direction of the axis L (see one-dot chain line d1 in FIG. 2(a)).

上記構成によれば、被密封空間S内に組み付けた際に第1シール部12aの先端部12aaと第2シール部12bの先端部12baがいずれも外径側に向けて弾性変形しやすい形状となる。すなわち、図2(c)に示すように密封装置10を被密封空間Sに組み付けると、第1シール部12aの先端部12aaは径方向内周面31bに弾接して外径側に弾性変形する。また第2シール部12bの先端部12baは径方向外周面40bに弾接して外径側に弾性変形する。このように、密封装置10は、第1シール部12aの先端部12aaと第2シール部12bの先端部12baとが外径側に弾性変形されて組付けられているので、内輪3,3と車軸管段差部40との嵌め合い部位に浸入するデフオイルが被密封空間Sに到達しても(図2(c)の2点鎖線矢印参照)、シール部材12によって径方向内周面31bと径方向外周面40bとの間を強固に効果的に密封することができる。よって、軸受シール装置20が配されている位置までデフオイルが浸入することを防止することができる。 According to the above configuration, both the tip end portion 12aa of the first seal portion 12a and the tip end portion 12ba of the second seal portion 12b are shaped to be easily elastically deformed toward the outer diameter side when assembled in the sealed space S. Become. That is, when the sealing device 10 is assembled in the sealed space S as shown in FIG. 2(c), the tip portion 12aa of the first seal portion 12a elastically contacts the radially inner peripheral surface 31b and is elastically deformed radially outward. . Further, the tip portion 12ba of the second seal portion 12b is elastically deformed radially outward by elastic contact with the radial outer peripheral surface 40b. As described above, the sealing device 10 is assembled by elastically deforming the tip portion 12aa of the first seal portion 12a and the tip portion 12ba of the second seal portion 12b to the outer diameter side. Even if the differential oil that enters the fitting portion with the axle tube stepped portion 40 reaches the sealed space S (see the two-dot chain line arrow in FIG. It is possible to firmly and effectively seal the space with the direction outer peripheral surface 40b. Therefore, it is possible to prevent the differential oil from entering the position where the bearing seal device 20 is arranged.

図2(a)に示すように芯金11の支持円輪部11bの径方向内方の端部11ba(1点鎖線d2位置参照)は、第1シール部12aと第2シール部12bとの間(略中央部位)に位置し、かつ、第1シール部12aの軸L方向の先端部12aa及び第2シール部12bの軸L方向の先端部12ba(1点鎖線d1位置参照)よりも、径方向の内側に位置するように設けられている。円筒嵌合部11aの長さ寸法と支持円輪部11bの長さ寸法との関係は図例に限定されないが、ここでは支持円輪部11bの方が円筒嵌合部11aより長く形成されており、第3シール部12cの略中央部位まで支持円輪部11bが配されるよう構成されている。上記構成によれば、支持円輪部11bの端部11baは、第1シール部12a及び第2シール部12bの間に位置しているため、第1シール部12aの弾性変形に伴う反力と第2シール部12bの弾性変形に伴う反力との干渉を抑制することができる。また、支持円輪部11bの端部11baが、第1シール部12a及び第2シール部12bの間に位置し、それぞれの先端部12aa,12abよりも径方向の内側に位置することで、第1シール部12a及び第2シール部12bのそれぞれを径方向内周面31b及び径方向外周面40bのそれぞれに、位置ずれすることなく安定した状態で弾接させることができ、所定のシール性能を確実に得ることができる。第1シール部12a及び第2シール部12bの圧縮率は特に限定されないが、圧縮率を10~30%が望ましい。圧縮率を10~30%にすることでシール部材12のへたりを軽減し、シール寿命の長期化を図ることができる。なお、図2(b)及び図2(c)において、シール部材12の2点鎖線は弾性変形前の状態を示している。 As shown in FIG. 2(a), the radially inner end portion 11ba (see the position of the one-dotted chain line d2) of the support ring portion 11b of the cored bar 11 is located between the first seal portion 12a and the second seal portion 12b. between (substantially central portion) and from the tip 12aa of the first seal portion 12a in the direction of the axis L and the tip portion 12ba of the second seal portion 12b in the direction of the axis L (see the position of the dashed line d1), It is provided so as to be positioned radially inward. Although the relationship between the length dimension of the cylindrical fitting portion 11a and the length dimension of the supporting ring portion 11b is not limited to the illustrated example, here, the supporting ring portion 11b is formed longer than the cylindrical fitting portion 11a. The support ring portion 11b is arranged up to the substantially central portion of the third seal portion 12c. According to the above configuration, since the end portion 11ba of the support ring portion 11b is positioned between the first seal portion 12a and the second seal portion 12b, the reaction force due to the elastic deformation of the first seal portion 12a is reduced. Interference with the reaction force associated with elastic deformation of the second seal portion 12b can be suppressed. In addition, the end portion 11ba of the support ring portion 11b is located between the first seal portion 12a and the second seal portion 12b, and is located radially inward of the tip portions 12aa and 12ab of the respective end portions 12aa and 12ab. The first seal portion 12a and the second seal portion 12b can be brought into elastic contact with the radially inner peripheral surface 31b and the radially outer peripheral surface 40b, respectively, in a stable state without positional deviation, and a predetermined sealing performance can be achieved. you can get it for sure. Although the compressibility of the first seal portion 12a and the second seal portion 12b is not particularly limited, it is desirable that the compressibility is 10 to 30%. By setting the compression rate to 10 to 30%, fatigue of the seal member 12 can be reduced, and the service life of the seal can be extended. 2(b) and 2(c), the two-dot chain line of the sealing member 12 indicates the state before elastic deformation.

図2(a)~図2(c)は、被密封空間Sへの密封装置1の組み付け要領を示している。密封装置1は、密封装置10は転がり軸受1の内輪段差部31に嵌合して組み付けられる。芯金11の屈曲部11cの湾曲部位を軸方向内周面31aに当てがい、嵌合円筒部11aの車体内部側の端部11abを治具を使って押圧し嵌め入れていく(図2(a)参照)。このとき、治具を押し当てる端部11abが金属の露出部位とされているので、作業性が向上する。芯金11の嵌合円筒部11aの端部11abが車体内部側の端面30と面一にくる位置まで嵌め入れると、第1シール部12aの先端部12aaが径方向内周面31bに弾接した状態になる(図2(b)参照)。そして転がり軸受1を車軸管4の車軸管段差部40に嵌合し、内輪段差部31と、車軸管段差部40とが突き合わされると、第2シール部12bの先端部12baが径方向外周面40bに弾接する。こうして、転がり軸受1の車軸管4への嵌合とともに密封装置1を被密封空間S内に組み付けることができる。 2(a) to 2(c) show how to assemble the sealing device 1 into the space S to be sealed. The sealing device 1 is assembled by fitting the sealing device 10 to the inner ring stepped portion 31 of the rolling bearing 1 . The curved portion of the bent portion 11c of the core metal 11 is applied to the axial inner peripheral surface 31a, and the end portion 11ab of the fitting cylindrical portion 11a on the vehicle body inner side is pressed and fitted using a jig (Fig. 2 ( a) see). At this time, since the end portion 11ab against which the jig is pressed is an exposed metal portion, workability is improved. When the end portion 11ab of the fitting cylindrical portion 11a of the cored bar 11 is fitted to the position where it is flush with the end surface 30 on the inside of the vehicle body, the tip portion 12aa of the first seal portion 12a is elastically contacted with the radial inner peripheral surface 31b. (See FIG. 2(b)). Then, when the rolling bearing 1 is fitted to the axle tube stepped portion 40 of the axle tube 4 and the inner ring stepped portion 31 and the axle tube stepped portion 40 are butted against each other, the distal end portion 12ba of the second seal portion 12b extends radially outward. It makes elastic contact with the surface 40b. In this way, the rolling bearing 1 can be fitted into the axle tube 4 and the sealing device 1 can be assembled in the space S to be sealed.

次に図3を参照しながら、同実施形態に係る密封装置の変形例について説明する。
なお、上記実施形態と共通する部分には、可能な限り同一の符号を付し、その構成及び作用・効果等の説明は省略する。
ここに示す密封装置10’は、芯金11の支持円輪部11bの長さ寸法が上記実施形態の支持円輪部11bの長さ寸法より短く形成され、支持円輪部11bの車輪側の面11bbに第4シール部12dとしてシール部材12に回り込み部分が設けられている点で異なるが、この他のシール部材12の基本構成は上述の実施形態と同様である。このように、支持円輪部11bの長さ寸法が図2に示す例よりも短くても、第4シール部12dの存在によりシール部材12を芯金11に強固に固着できるとともに、芯金11の車体内部側は金属の露出部位とすることができる。
Next, a modification of the sealing device according to the embodiment will be described with reference to FIG.
Parts common to those of the above-described embodiment are denoted by the same reference numerals as much as possible, and descriptions of their configurations, functions, effects, and the like are omitted.
In the sealing device 10' shown here, the length dimension of the circular supporting ring portion 11b of the core metal 11 is formed shorter than the length dimension of the circular supporting ring portion 11b of the above embodiment, and the wheel side of the circular supporting ring portion 11b is formed. The basic configuration of the sealing member 12 is the same as that of the above-described embodiment except that the seal member 12 is provided with a wraparound portion as a fourth seal portion 12d on the surface 11bb. As described above, even if the length dimension of the support ring portion 11b is shorter than the example shown in FIG. The inner side of the vehicle body can be exposed metal.

次に図4(a),図4(b)を参照しながら第2実施形態に係る密封装置について説明する。
なお、上記実施形態と共通する部分には、可能な限り同一の符号を付し、その構成及び作用・効果等の説明は省略する。
ここに示す密封装置10A,10A’は、芯金11の屈曲部11cが車体内部側に位置している点で、第1実施形態と異なるが、シール部材12の基本構成は上述の例と同様である。よって、この実施形態における芯金11の支持円輪部11bは、嵌合円筒部11aの車体内部側の端部11abから屈曲部11cを介して径方向内方に延出して形成される。このように、芯金11の屈曲部11cが車体内部側に位置する例でも、芯金11の車体内部側を金属の露出部位とすることができる。よって、この露出部位を治具等により直接押圧することができ、第1実施形態に係る密封装置10と同様の効果を奏する。また上記構成によれば、屈曲部11cから支持円輪部11bの車体内部側が、金属の露出部位とされているので、芯金11を内輪段差部31に嵌合させる際の押圧部位を広く確保することができる。よって、嵌合円筒部11aの軸方向内周面31aへの圧入がより一層安定し、密封装置10A,10A’をより適正な所定の位置に容易に固定することができる。
Next, a sealing device according to a second embodiment will be described with reference to FIGS. 4(a) and 4(b).
Parts common to those of the above-described embodiment are denoted by the same reference numerals as much as possible, and descriptions of their configurations, functions, effects, and the like are omitted.
The sealing devices 10A and 10A' shown here are different from the first embodiment in that the bent portion 11c of the metal core 11 is located on the inside of the vehicle body, but the basic configuration of the sealing member 12 is the same as the above example. is. Therefore, the circular supporting ring portion 11b of the core bar 11 in this embodiment is formed by extending radially inward from the end portion 11ab of the fitting cylindrical portion 11a on the inside of the vehicle body via the bent portion 11c. Thus, even in the example where the bent portion 11c of the cored bar 11 is positioned inside the vehicle body, the inner side of the vehicle body of the cored bar 11 can be used as the metal exposed portion. Therefore, the exposed portion can be directly pressed by a jig or the like, and the same effect as the sealing device 10 according to the first embodiment can be obtained. In addition, according to the above configuration, since the metal is exposed from the bent portion 11c to the inner side of the supporting ring portion 11b, a wide pressing portion is secured when fitting the core bar 11 to the inner ring stepped portion 31. can do. Therefore, the press-fitting of the fitting cylindrical portion 11a into the axial inner peripheral surface 31a is further stabilized, and the sealing devices 10A and 10A' can be easily fixed at more appropriate predetermined positions.

図4(b)に示す密封装置10A’は、図4(a)に示す密封装置10Aとは、支持円輪部11bの車輪側の面11bbに第4シール部12eとしてシール部材12に回り込み部分が設けられている点で異なる。これによれば、第4シール部12eの存在によりシール部材12を芯金11に強固に固着することができる。 The sealing device 10A′ shown in FIG. 4B differs from the sealing device 10A shown in FIG. is provided. According to this, the seal member 12 can be firmly fixed to the metal core 11 due to the presence of the fourth seal portion 12e.

次に図5を参照しながら第3実施形態に係る密封装置について説明する。
なお、上記実施形態と共通する部分には、可能な限り同一の符号を付し、その構成及び作用・効果等の説明は省略する。
ここに示す密封装置10Bは、断面が略T字状になるように芯金11の片側が屈曲して形成されている点で、上述の実施形態と異なるが、シール部材12の基本構成は上述の実施形態と同様である。
芯金11は、折り返し鍔部11dを有しており、この折り返し鍔部11dは、嵌合円筒部11aの車体内部側の端部11abから屈曲部11cを介して屈曲し車輪側へ折り曲げ形成されており、折り返し鍔部11dの車輪側の端部11daから略90°屈曲した屈曲部11eを介して支持円輪部11bが形成されている。
Next, a sealing device according to a third embodiment will be described with reference to FIG.
Parts common to those of the above-described embodiment are denoted by the same reference numerals as much as possible, and descriptions of their configurations, functions, effects, and the like are omitted.
The sealing device 10B shown here differs from the above-described embodiment in that one side of the metal core 11 is bent so that the cross section thereof is substantially T-shaped, but the basic structure of the sealing member 12 is the same as that described above. is similar to the embodiment of
The core bar 11 has a folded flange portion 11d, which is formed by bending from an end portion 11ab on the vehicle body inside side of the fitting cylindrical portion 11a through a bent portion 11c to the wheel side. A support circular ring portion 11b is formed via a bent portion 11e that is bent approximately 90° from the wheel-side end portion 11da of the folded collar portion 11d.

このように、芯金11の屈曲部11cが車体内部側に位置し折り返し鍔部11dを有する例でも、芯金11の車体内部側を金属の露出部位とすることができる。よって、この露出部位を治具等により直接押圧することができ、第1実施形態に係る密封装置10と同様の効果を奏する。また上記構成によれば、芯金11に折り返し鍔部11dを有することで嵌合円筒部11の嵌合力が向上し、より強固に軸方向内周面31aに密封装置10Bを嵌合させることができる。 Thus, even in the example where the bent portion 11c of the cored bar 11 is positioned on the vehicle body interior side and has the folded collar portion 11d, the body interior side of the cored bar 11 can be used as the metal exposed portion. Therefore, the exposed portion can be directly pressed by a jig or the like, and the same effect as the sealing device 10 according to the first embodiment can be obtained. In addition, according to the above configuration, since the core metal 11 has the folded collar portion 11d, the fitting force of the fitting cylindrical portion 11 is improved, and the sealing device 10B can be more firmly fitted to the axial inner peripheral surface 31a. can.

以上、上述した各実施形態に係る密封装置10,10’,10A,10A’,10Bは、図例の形状・構成に限定されるものではない。芯金11及びシール部材12の形状・構成も図例に限定されず、被密封空間Sの大きさに応じて設計される。 As described above, the sealing devices 10, 10', 10A, 10A', and 10B according to the embodiments described above are not limited to the shapes and configurations shown in the drawings. The shape and configuration of the metal core 11 and the seal member 12 are not limited to the illustrated examples, either, and are designed according to the size of the space S to be sealed.

10,10’,10A,10A’,10B 密封装置
100 車両用軸受装置
1 転がり軸受
2 外輪
3 内輪
30 車体側の端面
31 内輪段差部
31a 軸方向内周面
31b 径方向内周面
4 車軸管
40 車軸管段差部
40a 軸方向外周面
40b 径方向外周面
5 車軸
11 芯金
11a 嵌合円筒部
11b 支持円輪部
11c 屈曲部
12 シール部材
12a 第1シール部
12b 第2シール部
10, 10′, 10A, 10A′, 10B Sealing device 100 Vehicle bearing device 1 Rolling bearing 2 Outer ring 3 Inner ring 30 End surface 31 on the vehicle body side Inner ring stepped portion 31a Axial inner peripheral surface 31b Radial inner peripheral surface 4 Axle tube 40 Axle tube stepped portion 40a Axial outer peripheral surface 40b Radial outer peripheral surface 5 Axle 11 Core bar 11a Fitting cylindrical portion 11b Support ring portion 11c Bent portion 12 Seal member 12a First seal portion 12b Second seal portion

Claims (4)

車体内部に配備されるデファレンシャルギアに連結された車軸が挿通される車軸管と、前記車軸管の外周面に形成された車軸管段差部に外嵌され車輪を回転自在に支持する外輪及び内輪を有する転がり軸受とを備える車両用軸受装置において、前記内輪の前記車体内部側端面の内周角部に形成された内輪段差部と、前記車軸管段差部とが突き合わされて設けられる被密封空間を密封する密封装置であって、
前記内輪段差部は、前記車軸の軸方向に沿った軸方向内周面と、径方向に沿った径方向内周面とを有し、
前記車軸管段差部は、前記軸方向に沿った軸方向外周面と、前記径方向に沿った径方向外周面とを有しており、
前記軸方向内周面に嵌合される嵌合円筒部と、前記嵌合円筒部の一端部から前記径方向内方に延びる支持円輪部とを有する芯金と、
前記支持円輪部に一体的に設けられ、前記軸方向に延びる弾性部材からなる環状のシール部材とを備え、
前記嵌合円筒部の前記車体内部側は、金属の露出部位とされ、
前記シール部材は、前記径方向内周面に弾接する第1シール部と、前記径方向外周面に弾接する第2シール部とを有していることを特徴とする密封装置。
An axle tube through which an axle connected to a differential gear disposed inside a vehicle body is inserted, and an outer ring and an inner ring that are fitted to a stepped portion of the axle tube formed on the outer peripheral surface of the axle tube and rotatably support the wheel. A sealed space provided by abutting an inner ring stepped portion formed at an inner peripheral corner portion of the end surface of the inner ring on the vehicle body inside side and the axle tube stepped portion. A sealing device for sealing,
The inner ring stepped portion has an axial inner peripheral surface along the axial direction of the axle and a radial inner peripheral surface along the radial direction,
The axle tube stepped portion has an axial outer peripheral surface along the axial direction and a radial outer peripheral surface along the radial direction,
a core metal having a fitting cylindrical portion fitted to the axial inner peripheral surface, and a supporting circular ring portion extending radially inward from one end of the fitting cylindrical portion;
an annular seal member formed integrally with the support ring portion and made of an elastic member extending in the axial direction;
The inner side of the vehicle body of the fitting cylindrical portion is an exposed metal portion,
A sealing device, wherein the sealing member has a first sealing portion elastically contacting the radially inner peripheral surface and a second sealing portion elastically contacting the radially outer peripheral surface.
請求項1において、
前記支持円輪部の前記径方向内方の端部は、前記第1シール部と前記第2シール部との間に位置し、かつ、前記第1シール部の前記軸方向の先端部及び前記第2シール部の前記軸方向の先端部よりも、前記径方向の内側に位置することを特徴とする密封装置。
In claim 1,
The radially inner end portion of the support ring portion is positioned between the first seal portion and the second seal portion, and the axial tip portion of the first seal portion and the A sealing device, wherein the sealing device is positioned inside in the radial direction of the tip portion of the second seal portion in the axial direction.
請求項1または請求項2において、
前記支持円輪部は、前記嵌合円筒部の前記一端部から屈曲する屈曲部を介して前記径方向に延びていることを特徴とする密封装置。
In claim 1 or claim 2,
The sealing device according to claim 1, wherein the support ring portion extends in the radial direction via a bent portion bent from the one end portion of the fitting cylindrical portion.
請求項3において、
前記屈曲部は、前記支持円輪部の前記車体内部側に設けられ、
前記屈曲部及び前記支持円輪部の車体内部側は、金属の露出部位とされていることを特徴とする密封装置。
In claim 3,
The bent portion is provided on the inner side of the vehicle body of the support ring portion,
A sealing device according to claim 1, wherein the bent portion and the support ring portion are exposed to metal on the inner side of the vehicle body.
JP2021139292A 2021-08-27 2021-08-27 sealing device Pending JP2023032918A (en)

Priority Applications (1)

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Publication Number Publication Date
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