JP5026895B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP5026895B2
JP5026895B2 JP2007228006A JP2007228006A JP5026895B2 JP 5026895 B2 JP5026895 B2 JP 5026895B2 JP 2007228006 A JP2007228006 A JP 2007228006A JP 2007228006 A JP2007228006 A JP 2007228006A JP 5026895 B2 JP5026895 B2 JP 5026895B2
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seal
core
bearing device
wheel bearing
lip
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JP2009058100A (en
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孝幸 乗松
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NTN Corp
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NTN Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72Sealings
    • F16C33/76Sealings of ball or roller bearings
    • F16C33/78Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7873Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
    • F16C33/7876Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72Sealings
    • F16C33/76Sealings of ball or roller bearings
    • F16C33/78Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14Bearings 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
    • F16C19/18Bearings 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
    • F16C19/181Bearings 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
    • F16C19/183Bearings 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
    • F16C19/184Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00Articles relating to transporting
    • F16C2326/01Parts of vehicles in general
    • F16C2326/02Wheel hubs or castors

Description

本発明は、自動車等の車輪を回転自在に支承する車輪用軸受装置、特に、雨水や泥水等の異物が多量に存在する環境下においても充分な密封性を有するシールが装着された車輪用軸受装置に関するものである。   The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like, and in particular, a wheel bearing equipped with a seal having a sufficient sealing property even in an environment where a large amount of foreign matter such as rainwater and muddy water exists. It relates to the device.

自動車の車輪を懸架装置に対して回転自在に支持する車輪用軸受装置は、雨水や泥水等に直接曝される環境下にあるため、この雨水や泥水等が軸受内部に浸入しないように強固な密封性を有するシールが装着されている。また、このシールの嵌合部、特に、シールの芯金が圧入される金属嵌合部においては、雨水や泥水等がこの嵌合部に浸入して芯金が発錆することがあった。芯金が発錆すれば、シールの気密性が損なわれるだけでなく、シール機能が低下して軸受の耐久性に影響を及ぼすことになる。近年、こうした厳しい環境下で使用されるこの種の車輪用軸受装置において、さらなる長寿命化が要求されるようになっているが、市場回収品の軸受損傷状況を検証すると、剥離等の本来の軸受寿命よりも、シール不具合による損傷が多くを占めている。したがって、シールの密封性と耐久性を高めて軸受寿命の向上を図った車輪用軸受装置が種々提案されている。   Since the wheel bearing device that supports the wheel of the automobile rotatably with respect to the suspension device is in an environment where it is directly exposed to rainwater, muddy water, etc., it is strong so that this rainwater, muddy water, etc. does not enter the inside of the bearing. A seal having a sealing property is attached. In addition, in the fitting portion of this seal, in particular, in the metal fitting portion into which the core metal of the seal is press-fitted, rain water or muddy water may enter the fitting portion and the core metal may rust. If the metal core rusts, not only the airtightness of the seal is impaired, but also the sealing function is lowered and the durability of the bearing is affected. In recent years, this type of wheel bearing device used in such a harsh environment has been required to have a longer service life. Damage due to seal failure accounts for more than the bearing life. Accordingly, various wheel bearing devices have been proposed in which the sealability and durability of the seal are improved to improve the bearing life.

図8に示す車輪用軸受装置はこの代表的な一例である。これは駆動輪側の車輪用軸受装置であって、外周に車体(図示せず)に取り付けられる車体取付フランジ51bを一体に有し、内周に複列の外側転走面51a、51aが形成された外方部材51と、一端部に車輪(図示せず)が取り付けられる車輪取付フランジ53を一体に有し、外周に前記複列の外側転走面51a、51aに対向する一方の内側転走面52aと、この内側転走面52aから軸方向に延びる円筒状の小径段部52bが形成され、内周にトルク伝達用のセレーションが形成されたハブ輪52と、小径段部52bに圧入され、外周に他方の内側転走面55aが形成された内輪55とを備えている。ハブ輪52の車輪取付フランジ53の円周等配位置には車輪(図示せず)を取り付けるためのハブボルト54が植設されている。   The wheel bearing device shown in FIG. 8 is a typical example of this. This is a wheel bearing device on the drive wheel side, and integrally has a vehicle body mounting flange 51b attached to the vehicle body (not shown) on the outer periphery, and double row outer rolling surfaces 51a and 51a are formed on the inner periphery. The outer member 51 and the wheel mounting flange 53 to which a wheel (not shown) is attached at one end are integrally formed, and one inward rolling facing the double row outer rolling surfaces 51a, 51a is provided on the outer periphery. A running surface 52a, a cylindrical small-diameter stepped portion 52b extending in the axial direction from the inner rolling surface 52a, a hub wheel 52 formed with serrations for torque transmission on the inner periphery, and press-fitted into the small-diameter stepped portion 52b And an inner ring 55 having the other inner rolling surface 55a formed on the outer periphery. A hub bolt 54 for mounting a wheel (not shown) is implanted at a circumferentially equidistant position of the wheel mounting flange 53 of the hub wheel 52.

複列の外側転走面51a、51aと、これらに対向する内側転走面52a、55a間には複列のボール56が保持器57によって転動自在に収容されている。また、ハブ輪52と内輪55とからなる内方部材58と、前記外方部材51との間に形成される環状空間の開口部にはシール59、60がそれぞれ装着され、軸受内部に封入された潤滑グリースの漏洩と、外部から雨水や泥水等が軸受内に浸入するのを防止している。   A double row of balls 56 is accommodated by a cage 57 between the double row outer raceway surfaces 51a and 51a and the inner raceway surfaces 52a and 55a opposite to each other. Seals 59 and 60 are respectively attached to the openings of the annular space formed between the inner member 58 formed of the hub ring 52 and the inner ring 55 and the outer member 51, and sealed inside the bearing. This prevents leakage of lubricating grease and intrusion of rainwater and muddy water into the bearing from the outside.

これらのシール59、60のうち外方部材51と内輪55間に装着されたシール60は、図9に示すように、固定側軌道輪となる外方部材51に内嵌され、断面L字状に形成された芯金61と、この芯金61に一体に加硫接着されたシール部材62とからなる環状のシール板63と、回転側軌道輪となる内輪55に外嵌され、同じく断面L字状に形成されたスリンガ64とを備えている。シール部材62はゴム等の弾性部材からなり、サイドリップ62aとグリースリップ62b、および中間リップ62cの3本のシールリップを備え、サイドリップ62aの先端縁をスリンガ64の立板部64bの内側面に摺接させると共に、残りのグリースリップ62bと中間リップ62cの先端縁をスリンガ64の円筒部64aに摺接させている。   Of these seals 59, 60, the seal 60 mounted between the outer member 51 and the inner ring 55 is fitted into the outer member 51 serving as a fixed raceway, as shown in FIG. Are fitted on an annular seal plate 63 composed of a cored bar 61 formed on the cored bar 61 and a sealing member 62 vulcanized and bonded to the cored bar 61, and an inner ring 55 serving as a rotating raceway. And a slinger 64 formed in a letter shape. The seal member 62 is made of an elastic member such as rubber, and includes three seal lips, that is, a side lip 62a, a grease lip 62b, and an intermediate lip 62c, and the end edge of the side lip 62a is the inner surface of the standing plate portion 64b of the slinger 64. The tip edges of the remaining grease lip 62b and intermediate lip 62c are in sliding contact with the cylindrical portion 64a of the slinger 64.

また、スリンガ64の外側面には、磁性体粉が混入されたエンコーダ65が一体に加硫接着されている。このエンコーダ65は、周方向に交互に磁極N、Sが形成されたゴム磁石からなり、車輪回転速度の検出用のロータリエンコーダを構成している。そして、シール板63とスリンガ64の立板部64bの先端とは僅かな径方向すきまを介して対峙され、このすきまでラビリンスシール66を構成している。そして、芯金61の露出した先端部にシール部材62のゴムを回り込ませ、シール板63の嵌合部の気密性を高めると共に、内輪55の露出した幅面と面取部、および外径面に、金属メッキ層や水溶性アクリル樹脂系塗膜等の樹脂層からなる防錆処理層67が形成され、スリンガ64の嵌合部の発錆を防止して雨水や泥水等の異物が多量に存在する環境下においても充分な気密性と密封性を発揮するように構成されている(例えば、特許文献1参照。)。
特開2002−147478号公報
An encoder 65 mixed with magnetic powder is integrally vulcanized and bonded to the outer surface of the slinger 64. The encoder 65 is composed of a rubber magnet having magnetic poles N and S alternately formed in the circumferential direction, and constitutes a rotary encoder for detecting wheel rotation speed. The seal plate 63 and the tip of the standing plate portion 64b of the slinger 64 are opposed to each other through a slight radial clearance, and the labyrinth seal 66 is configured up to this clearance. Then, the rubber of the seal member 62 is wrapped around the exposed tip portion of the core bar 61 to improve the airtightness of the fitting portion of the seal plate 63 and to the exposed width surface, chamfered portion, and outer diameter surface of the inner ring 55. In addition, a rust prevention layer 67 made of a resin layer such as a metal plating layer or a water-soluble acrylic resin-based coating is formed to prevent rusting of the fitting part of the slinger 64 and a large amount of foreign matter such as rainwater and muddy water is present. Even under such circumstances, it is configured to exhibit sufficient airtightness and sealing performance (see, for example, Patent Document 1).
JP 2002-147478 A

然しながら、こうした従来のシール60では、防錆処理層67を形成するための工程が増え、この工程増しにより製造コストが高騰する問題があった。一方、シール板63の製造工程において、ゴム等の弾性部材を加硫接着させてシール部材62を芯金61に接合する際、芯金61が金型内でずれないように位置決めするための固定ピン(図示せず)が必要になる。この時、加硫前に複数の固定ピンを芯金61に密着させて支持するため、加硫後は固定ピンが接触していた部位にシール部材62が回り込まず、所謂ローレット部が形成される。したがって、このローレット部だけは芯金61の表面が一部露出することになる。   However, such a conventional seal 60 has a problem in that the number of steps for forming the antirust treatment layer 67 is increased, and the manufacturing cost increases due to the increase in the number of steps. On the other hand, in the manufacturing process of the seal plate 63, when the seal member 62 is bonded to the cored bar 61 by vulcanizing and bonding an elastic member such as rubber, the cored bar 61 is positioned so as not to be displaced in the mold. A pin (not shown) is required. At this time, since a plurality of fixing pins are closely attached to and supported by the cored bar 61 before vulcanization, the sealing member 62 does not go around the portion where the fixing pins are in contact after vulcanization, and a so-called knurled portion is formed. . Accordingly, only the knurled part exposes the surface of the cored bar 61 partially.

通常、芯金61は低コストで成型性の良い冷間圧延鋼鈑(JIS規格のSPCC系等)が使用されるが、雨水や泥水等に直接曝される厳しい環境下では、僅かな面積のローレット部であっても一部芯金61が露出してしまうと、この部位から芯金61が腐食してゴムが剥れてしまう恐れがある。これにより、シール60の密封性が損なわれて軸受寿命が低下することになり、簡単な構成で、かつ、左程コストアップを伴わない改善が求められていた。   Normally, the core bar 61 is a cold-rolled steel plate (JIS standard SPCC, etc.) with low cost and good formability. However, in a severe environment directly exposed to rainwater or muddy water, the area of a small area is small. If the cored bar 61 is partially exposed even in the knurled part, the cored bar 61 may corrode from this part and the rubber may peel off. As a result, the sealing performance of the seal 60 is impaired and the bearing life is reduced, and there has been a demand for an improvement that has a simple configuration and does not increase in cost to the left.

本発明は、このような従来の問題に鑑みてなされたもので、シールの密封性と耐久性を高めて軸受の長寿命化を図った車輪用軸受装置を提供することを目的とする。   The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a wheel bearing device in which the sealing performance and durability of a seal are enhanced to extend the life of the bearing.

係る目的を達成すべく、本発明のうち請求項1に記載の発明は、内周に複列の外側転走面が一体に形成された外方部材と、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体と、前記外方部材と内方部材との間に形成された環状空間の開口部に装着されたシールとを備えた車輪用軸受装置において、前記シールが、前記外方部材の端部に内嵌される芯金と、この芯金に接合され、複数のシールリップを有するシール部材とを備え、前記シール部材を加硫接着させて前記芯金に接合する際、この芯金を位置決めした固定ピンの接触部であるローレット部が前記シール部材のシールリップ間に形成されると共に、このローレット部を外部から遮断するためにローレット部が前記芯金の内径部の平坦部でシールリップ間に形成されている。
In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and an outer rolling of the double row on the outer periphery. An inner member in which a double row inner rolling surface facing the surface is formed, and a double row accommodated between the rolling surfaces of the inner member and the outer member via a retainer so as to roll freely. A rolling bearing and a seal mounted in an opening of an annular space formed between the outer member and the inner member, wherein the seal is an end of the outer member. A metal core that is fitted into the core, and a seal member that is joined to the metal core and has a plurality of seal lips . When the seal member is vulcanized and bonded to the metal core, with knurled portion is formed between the sealing lip of the sealing member is a contact portion of the positioning the fixing pin, the Knurled portion in order to block Retto portion from the outside is formed between the sealing lip at the flat portion of the inside diameter portion of the core metal.

このように、シールが、外方部材の端部に内嵌される芯金と、この芯金に接合され、複数のシールリップを有するシール部材とを備え、シール部材を加硫接着させて芯金に接合する際、この芯金を位置決めした固定ピンの接触部であるローレット部がシール部材のシールリップ間に形成されると共に、このローレット部を外部から遮断するためにローレット部が芯金の内径部の平坦部でシールリップ間に形成されているので、ローレット部の芯金が露出していても、遮蔽手段によって雨水や泥水等が浸入するのが防止されてローレット部が直接外部環境に曝されることがなくなり、コストアップすることなく芯金が発錆するのを防止してシールの密封性を維持し、軸受寿命を確保することができる。
As described above, the seal includes the core bar fitted into the end portion of the outer member, and the seal member bonded to the core bar and having a plurality of seal lips , and the seal member is vulcanized and bonded to the core. When joining the gold, a knurled portion, which is a contact portion of the fixing pin that positions the core metal, is formed between the seal lips of the seal member, and the knurled portion is made of the core metal to block the knurled portion from the outside . Since it is formed between the seal lips at the flat part of the inner diameter part, even if the core metal of the knurled part is exposed, the shielding means prevents rainwater and muddy water from entering, and the knurled part directly enters the external environment. It is not exposed, and the core metal is prevented from being rusted without increasing the cost, the sealing performance of the seal is maintained, and the bearing life can be ensured.

また、請求項に記載の発明のように、前記シールが、前記外方部材に内嵌された円筒状の嵌合部、およびこの嵌合部から径方向内方に延びる内径部からなる芯金と、この芯金に加硫接着により一体に接合され、それぞれ異なった長さで径方向外方に傾斜して形成された一対のサイドリップを有するシール部材とからなる一体型のシールで構成されると共に、前記ローレット部が、前記芯金の内径部の平坦部で、前記一対のサイドリップの間に周方向等配に配置されていれば、ローレット部が直接外部環境に曝されることがなくなり、芯金が発錆するのを防止することができる。
According to a second aspect of the present invention, the seal includes a cylindrical fitting portion fitted into the outer member, and a core formed of an inner diameter portion extending radially inward from the fitting portion. Consists of an integrated seal composed of gold and a pair of side lips that are integrally joined to the metal core by vulcanization and that are inclined at different lengths and radially outward. In addition, if the knurled portion is a flat portion of the inner diameter portion of the cored bar and is arranged in a circumferentially equidistant manner between the pair of side lips, the knurled portion is directly exposed to the external environment. And the core metal can be prevented from rusting.

また、請求項に記載の発明のように、前記シールが、前記外方部材に内嵌された円筒状の嵌合部、およびこの嵌合部から径方向内方に延びる内径部からなる芯金と、この芯金に加硫接着により一体に接合され、径方向外方に傾斜して延びるサイドリップ、およびラジアルリップを有するシール部材とからなる環状のシール板と、このシール板に対向配置され、前記内方部材に外嵌され、前記ラジアルリップが摺接する円筒部、およびこの円筒部から径方向外方に延び、前記サイドリップが摺接される立板部からなるスリンガとで構成されると共に、前記ローレット部が、前記芯金の内径部の平坦部で、前記サイドリップとラジアルリップとの間に周方向等配に配置されていれば、芯金が一部露出していても、サイドリップによって外部から遮蔽され、雨水や泥水等が浸入するのが防止されるので、ローレット部が直接外部環境に曝されることがなくなり、コストアップすることなく、芯金が発錆するのを防止することができる。
According to a third aspect of the present invention, the seal includes a cylindrical fitting portion fitted in the outer member, and a core having an inner diameter portion extending radially inward from the fitting portion. and gold, are bonded together by vulcanization bonding to the metal core, side lip extending obliquely radially outward, and an annular seal plate comprising a sealing member having and La Jiarurippu, this sealing plate A slinger composed of a cylindrical portion that is disposed oppositely and that is externally fitted to the inward member and that is in sliding contact with the radial lip, and a vertical plate that extends radially outward from the cylindrical portion and is in sliding contact with the side lip. If the knurled part is a flat part of the inner diameter part of the cored bar and is arranged in a circumferentially equidistant manner between the side lip and the radial lip, a part of the cored bar is exposed. Even from the outside by the side lip Since it is covered and rainwater and muddy water etc. are prevented from entering, the knurled part is not directly exposed to the external environment, and the core metal can be prevented from rusting without increasing the cost. .

また、請求項に記載の発明のように、前記シール部材が前記芯金の嵌合部の端部に回り込んで接合されていれば、外部に露出した芯金の表面部を覆って芯金の発錆を防止すると共に、芯金の嵌合部から雨水や泥水等が浸入しないように気密性を高めることができる。
Further, as in the invention according to claim 4 , if the sealing member is wrapped around and joined to the end portion of the fitting portion of the core metal, the core portion covering the surface portion of the core metal exposed to the outside is covered. While preventing rusting of gold, airtightness can be enhanced so that rainwater, muddy water and the like do not enter from the fitting portion of the cored bar.

好ましくは、請求項に記載の発明のように、前記芯金の嵌合部の端部に尖塔状に突出した環状のリップが形成され、前記外方部材の端部内周に弾性接触されていれば、芯金の嵌合部の気密性を一層高めることができる。
Preferably, as in the invention described in claim 5 , an annular lip protruding in a spire shape is formed at the end of the fitting portion of the cored bar, and is elastically contacted with the inner periphery of the end of the outer member. If it does, the airtightness of the fitting part of a metal core can be improved further.

また、請求項に記載の発明のように、前記芯金が防錆能を有する鋼板から形成されていれば、ローレット部が直接外部環境に曝されても芯金が発錆するのを確実に防止することができる。
Moreover, if the said core metal is formed from the steel plate which has rust prevention ability like invention of Claim 6 , even if a knurled part is exposed to an external environment directly, it will ensure that a core metal rusts. Can be prevented.

本発明に係る車輪用軸受装置は、内周に複列の外側転走面が一体に形成された外方部材と、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体と、前記外方部材と内方部材との間に形成された環状空間の開口部に装着されたシールとを備えた車輪用軸受装置において、前記シールが、前記外方部材の端部に内嵌される芯金と、この芯金に接合され、複数のシールリップを有するシール部材とを備え、前記シール部材を加硫接着させて前記芯金に接合する際、この芯金を位置決めした固定ピンの接触部であるローレット部が前記シール部材のシールリップ間に形成されると共に、このローレット部を外部から遮断するためにローレット部が前記芯金の内径部の平坦部でシールリップ間に形成されているので、ローレット部の芯金が露出していても、遮蔽手段によって雨水や泥水等が浸入するのが防止されてローレット部が直接外部環境に曝されることがなくなり、コストアップすることなく芯金が発錆するのを防止してシールの密封性を維持し、軸受寿命を確保することができる。 The wheel bearing device according to the present invention includes an outer member in which a double row outer rolling surface is integrally formed on an inner periphery, and a double row inner rolling that faces the outer rolling surface of the double row on an outer periphery. An inner member having a surface formed thereon, a double row rolling element housed between the rolling surfaces of the inner member and the outer member via a cage, and the outer member; A wheel bearing device including a seal mounted in an opening of an annular space formed between the inner member and a core metal fitted into an end of the outer member; bonded to the metal core, and a sealing member having a plurality of sealing lips, wherein when joining the sealing member to the core metal vulcanized by wearing a contact portion of the fixed pin to position the metal core knurling with part is formed between the sealing lip of the sealing member, to cut off the knurled portion from the outside Since the knurled portion is formed between the sealing lip at the flat portion of the inside diameter portion of the core metal for, even if the metal core of the knurled portion is exposed, it prevents the rain water or muddy water, etc. from entering the shielding means As a result, the knurled portion is not directly exposed to the external environment, the core metal is prevented from rusting without increasing the cost, the sealing performance of the seal is maintained, and the bearing life can be ensured.

外周に懸架装置に取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に前記複列の外側転走面に対向する一方の内側転走面と、この内側転走面から軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体と、前記外方部材と内方部材との間に形成された環状空間の開口部に装着されたシールとを備えた車輪用軸受装置において、前記シールのうちアウター側のシールが、前記外方部材の端部に内嵌される円筒状の嵌合部、およびこの嵌合部から屈曲して形成され、径方向内方に延びる内径部を有する芯金と、この芯金に一体に接合され、それぞれ異なった長さで径方向外方に傾斜して形成された一対のサイドリップを有するシール部材とからなり、前記車輪取付フランジのインナー側の基部が断面円弧状の曲面に形成され、この基部に前記一対のサイドリップが所定のシメシロを介して摺接すると共に、前記シール部材を加硫接着させて前記芯金に接合する際、この芯金を位置決めした固定ピンの接触部であるローレット部が、前記芯金の内径部の平坦部で、前記一対のサイドリップの間に周方向等配に配置され、このサイドリップによって当該ローレット部が外部から遮断されている。   A body mounting flange for mounting to the suspension device on the outer periphery is integrated, an outer member with a double row outer raceway formed on the inner periphery, and a wheel mounting flange for mounting a wheel on one end A hub wheel having an outer periphery and one inner rolling surface facing the outer rolling surface of the double row, and a small-diameter step portion extending in an axial direction from the inner rolling surface, and the hub wheel An inner member comprising an inner ring that is press-fitted into a small-diameter step portion and has the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and both rolling of the inner member and the outer member. A double-row rolling element accommodated between the running surfaces via a cage, and a seal attached to an opening of an annular space formed between the outer member and the inner member. In the wheel bearing device provided, an outer seal of the seals is an end of the outer member. A cylindrical fitting part fitted inside, a cored bar formed by bending from the fitting part, and having an inner diameter part extending radially inward, and integrally joined to the cored bar, respectively A seal member having a pair of side lips formed to be slanted radially outward in length, and a base portion on the inner side of the wheel mounting flange is formed into a curved surface having an arcuate cross section. When the side lip is slidably contacted via a predetermined shimiro and the seal member is vulcanized and bonded to the cored bar, the knurled part, which is the contact part of the fixed pin that positions the cored bar, It is a flat part of the inner diameter part of the gold, and is arranged in the circumferential direction equally between the pair of side lips, and the knurled part is blocked from the outside by the side lips.

以下、本発明の実施の形態を図面に基いて詳細に説明する。
図1は、本発明に係る車輪用軸受装置の一実施形態を示す縦断面図、図2は、図1の一方のシール部を示す要部拡大図、図3は、図2のシール単体を示す拡大断面図、図4(a)は、図3のシールの変形例を示す拡大断面図、(b)は、(a)の他の変形例を示す拡大断面図、図5は、図1の他方のシール部を示す要部拡大図、図6は、図5のシール単体を示す拡大断面図、図7(a)〜(d)は、図6のシールの変形例を示す拡大断面図である。なお、以下の説明では、車両に組み付けた状態で車両の外側寄りとなる側をアウター側(図1の左側)、中央寄り側をインナー側(図1の右側)という。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, FIG. 2 is an enlarged view of a main part showing one seal part of FIG. 1, and FIG. 3 is a single seal of FIG. 4A is an enlarged sectional view showing a modification of the seal of FIG. 3, FIG. 4B is an enlarged sectional view showing another modification of FIG. 5, and FIG. FIG. 6 is an enlarged cross-sectional view showing a single seal of FIG. 5, and FIGS. 7A to 7D are enlarged cross-sectional views showing a modification of the seal of FIG. It is. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

この車輪用軸受装置は駆動輪用で、内方部材1と外方部材10、および両部材1、10間に収容された複列の転動体(ボール)6、6とを備え、第3世代と称される構成をなしている。内方部材1は、ハブ輪2と、このハブ輪2に所定のシメシロを介して圧入された内輪3とからなる。   This wheel bearing device is for a drive wheel, and includes an inner member 1, an outer member 10, and double-row rolling elements (balls) 6 and 6 accommodated between both members 1, 10, and the third generation. The structure is called. The inner member 1 includes a hub ring 2 and an inner ring 3 that is press-fitted into the hub ring 2 through a predetermined scissors.

ハブ輪2は、アウター側の端部に車輪(図示せず)を取り付けるための車輪取付フランジ4を一体に有し、外周に一方(アウター側)の内側転走面2aと、この内側転走面2aから軸方向に延びる円筒状の小径段部2bが形成され、内周にはトルク伝達用のセレーション(またはスプライン)2cが形成されている。また、車輪取付フランジ4の周方向等配位置にハブボルト5が植設されている。内輪3は、外周に他方(インナー側)の内側転走面3aが形成され、ハブ輪2の小径段部2bに所定のシメシロを介して圧入固定されている。   The hub wheel 2 integrally has a wheel mounting flange 4 for attaching a wheel (not shown) to an end portion on the outer side, one (outer side) inner rolling surface 2a on the outer periphery, and this inner rolling. A cylindrical small-diameter step 2b extending in the axial direction from the surface 2a is formed, and a serration (or spline) 2c for torque transmission is formed on the inner periphery. Further, hub bolts 5 are implanted at equal circumferential positions of the wheel mounting flange 4. The inner ring 3 is formed with the other (inner side) inner rolling surface 3a on the outer periphery, and is press-fitted and fixed to the small-diameter step portion 2b of the hub ring 2 via a predetermined shimiro.

ハブ輪2はS53C等の炭素0.40〜0.80wt%を含む中高炭素鋼で形成され、内側転走面2aをはじめ、後述するシール8のシールランド部となる車輪取付フランジ4のインナー側の基部17から小径段部2bに亙って高周波焼入れによって58〜64HRCの範囲に表面が硬化処理されている。一方、内輪3および転動体6はSUJ2等の高炭素クロム鋼で形成され、ズブ焼入れによって芯部まで58〜64HRCの範囲に硬化処理されている。   The hub wheel 2 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes an inner rolling surface 2a and an inner side of a wheel mounting flange 4 serving as a seal land portion of a seal 8 to be described later. The surface is hardened in the range of 58 to 64 HRC by induction hardening from the base portion 17 to the small diameter step portion 2b. On the other hand, the inner ring 3 and the rolling element 6 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core portion by quenching.

外方部材10は、外周に懸架装置を構成するナックル(図示せず)に取り付けられるための車体取付フランジ10bを一体に有し、内周に内方部材1の内側転走面2a、3aに対向する複列の外側転走面10a、10aが一体に形成されている。これら両転走面10a、2aおよび10a、3a間には保持器7を介して複列の転動体6、6が転造自在に収容されている。この外方部材10はS53C等の炭素0.40〜0.80wt%を含む中高炭素鋼で形成され、少なくとも複列の外側転走面10a、10aが、高周波焼入れによって58〜64HRCの範囲に表面が硬化処理されている。外方部材10と内方部材1との間に形成される環状空間の開口部にはシール8、9が装着され、軸受内部に封入された潤滑グリースの外部への漏洩と、外部から雨水やダスト等が軸受内部に浸入するのを防止している。   The outer member 10 integrally has a vehicle body mounting flange 10b to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and the inner rolling surfaces 2a and 3a of the inner member 1 on the inner periphery. Opposing double-row outer rolling surfaces 10a and 10a are integrally formed. Between these rolling surfaces 10a, 2a and 10a, 3a, double row rolling elements 6, 6 are accommodated via a cage 7 so as to be freely rollable. This outer member 10 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least double row outer raceway surfaces 10a and 10a are surfaced in the range of 58 to 64HRC by induction hardening. Has been cured. Seals 8 and 9 are attached to the opening of the annular space formed between the outer member 10 and the inner member 1, and leakage of the lubricating grease sealed inside the bearing to the outside, rainwater and It prevents dust and the like from entering the bearing.

なお、ここでは、転動体6にボールを使用した複列アンギュラ玉軸受を例示したが、本発明はこれに限らず、転動体6に円錐ころを使用した複列円錐ころ軸受であっても良い。また、本発明に係る車輪用軸受装置は、例示した第3世代構造に限らず、シールが装着された第1世代乃至第4世代構造の車輪用軸受装置に適用することができる。   In addition, although the double row angular contact ball bearing which used the ball for the rolling element 6 was illustrated here, this invention is not restricted to this, The double row tapered roller bearing which uses the tapered roller for the rolling element 6 may be sufficient. . The wheel bearing device according to the present invention is not limited to the illustrated third generation structure, and can be applied to a wheel bearing device having a first generation to a fourth generation structure to which a seal is attached.

シール8、9のうちアウター側のシール8は、図2に拡大して示すように、芯金11と、この芯金11に加硫接着により一体に接合されたシール部材12とからなる一体型のシールで構成されている。芯金11は、冷間圧延鋼鈑(JIS規格のSPCC系等)をプレス加工にて形成され、外方部材10の端部内周に内嵌される円筒状の嵌合部11aと、この嵌合部11aから屈曲して形成され、径方向内方に延びる内径部11bとを備えている。   The seal 8 on the outer side of the seals 8 and 9, as shown in an enlarged view in FIG. 2, is an integral type comprising a cored bar 11 and a seal member 12 integrally joined to the cored bar 11 by vulcanization adhesion. It is composed of a seal. The metal core 11 is formed by press-working a cold rolled steel plate (JIS standard SPCC system or the like), and a cylindrical fitting portion 11a fitted into the inner periphery of the end of the outer member 10, and this fitting And an inner diameter part 11b formed by bending from the joint part 11a and extending radially inward.

一方、シール部材12は、ニトリルゴム等の合成ゴムからなり、加硫接着によって芯金11に一体に接合されている。このシール部材12は、それぞれ異なった長さで径方向外方に傾斜して形成された一対のサイドリップ12a、12bと、インナー側(軸受内方側)に傾斜して形成されたラジアルリップ12cとを有している。車輪取付フランジ4の基部17は断面が円弧状の曲面に形成され、この基部17に一対のサイドリップ12a、12bが所定のシメシロをもって摺接すると共に、ラジアルリップ12cが僅かな径方向すきまを介して基部17に対峙し、ラビリンスシールを構成している。   On the other hand, the seal member 12 is made of synthetic rubber such as nitrile rubber and is integrally joined to the core metal 11 by vulcanization adhesion. The seal member 12 has a pair of side lips 12a and 12b formed with different lengths and inclined radially outward, and a radial lip 12c formed inclined on the inner side (bearing inward side). And have. A base portion 17 of the wheel mounting flange 4 is formed in a curved surface having an arc-shaped cross section. A pair of side lips 12a and 12b are slidably contacted with the base portion 17 with a predetermined squeeze, and a radial lip 12c is interposed through a slight radial clearance. A labyrinth seal is formed facing the base 17.

ここで、シール部材12は、図3に示すように、芯金11の嵌合部11aの端部から内径部11bの内端部に亙る範囲に接合され、外部に露出した芯金11の表面部を覆うと共に、嵌合部11aの端部に尖塔状に突出した環状のリップ12dが形成され、外方部材10の端部内周に弾性接触している。これにより、芯金11の露出した部分の発錆を防止すると共に、芯金11の嵌合部11aから雨水や泥水等が浸入しないように気密性を高めている。   Here, as shown in FIG. 3, the seal member 12 is joined to a range extending from the end of the fitting portion 11 a of the core metal 11 to the inner end of the inner diameter portion 11 b, and is exposed to the outside. An annular lip 12d protruding in a spire shape is formed at the end portion of the fitting portion 11a, and is in elastic contact with the inner periphery of the end portion of the outer member 10. Thereby, while preventing the rusting of the exposed part of the core metal 11, airtightness is improved so that rainwater, muddy water, etc. may not enter from the fitting part 11a of the core metal 11.

さらに、本実施形態では、シール8の製造工程において、ゴム等の弾性部材を加硫接着させてシール部材12を芯金11に接合する際、芯金11を位置決めするための固定ピンの接触部であるローレット部13が周方向等配に形成されるが、このローレット部13が、芯金11の内径部11bの平坦部で、一対のサイドリップ12a、12bの間に配置されている。これにより、芯金11が一部露出していても、サイドリップ12aがローレット部13の遮蔽手段となって雨水や泥水等が浸入するのが防止されているので、ローレット部13が直接外部環境に曝されることがなくなり、コストアップすることなく、芯金11が発錆するのを防止してシール8の密封性を維持し、軸受寿命を確保することができる。   Furthermore, in the present embodiment, in the manufacturing process of the seal 8, when the elastic member such as rubber is vulcanized and bonded and the seal member 12 is joined to the core metal 11, the contact portion of the fixing pin for positioning the core metal 11. The knurled portion 13 is formed in a uniform manner in the circumferential direction. The knurled portion 13 is a flat portion of the inner diameter portion 11b of the core metal 11 and is disposed between the pair of side lips 12a and 12b. Thereby, even if the core metal 11 is partially exposed, the side lip 12a serves as a shielding means for the knurled portion 13 to prevent intrusion of rainwater, muddy water, and the like. Thus, the core metal 11 can be prevented from being rusted without increasing the cost, the sealing performance of the seal 8 can be maintained, and the bearing life can be ensured.

図4に変形例を示す。(a)に示すシール14は、前述したシール8(図3)と基本的にはローレット部15の位置が異なるだけで、その他同一部品同一部位あるいは同一機能を有する部位には同じ符号を付して詳細な説明を省略する。   FIG. 4 shows a modification. The seal 14 shown in (a) is basically different in the position of the knurled portion 15 from the seal 8 (FIG. 3) described above, and other parts having the same parts or functions have the same reference numerals. Detailed description is omitted.

シール14のローレット部15は、芯金11の内径部11bの平坦部で、サイドリップ12aの根元部の径方向外方側に周方向等配に配置されている。このローレット部15は、加硫接着によって芯金11にシール部材12を接合した後、露出した芯金11の表面にシール部材12と同一の材質からなる合成ゴムが接合され、ローレット部15に薄膜15aが形成されている。この薄膜15aからなる遮蔽手段により、芯金11が外部に露出するのを防止し、ローレット部15から芯金11が発錆するのを防止することができる。   The knurled portion 15 of the seal 14 is a flat portion of the inner diameter portion 11 b of the core metal 11, and is arranged on the radially outer side of the root portion of the side lip 12 a in a circumferentially uniform manner. The knurled portion 15 is formed by bonding a seal member 12 to the core metal 11 by vulcanization adhesion, and then bonding a synthetic rubber made of the same material as the seal member 12 to the exposed surface of the core metal 11. 15a is formed. The shielding means made of the thin film 15 a can prevent the core metal 11 from being exposed to the outside and prevent the core metal 11 from rusting from the knurled portion 15.

(b)に示すシール16は、ローレット部13が、芯金18の内径部18bの平坦部で、サイドリップ12aの径方向外方側の根元部に周方向等配に配置されている。ここでは、芯金18は、オーステナイト系ステンレス鋼鈑(JIS規格のSUS304系等)や防錆処理された冷間圧延鋼鈑(JIS規格のSPCC系等)等、耐食性を有する鋼板等をプレス加工にて形成され、円筒状の嵌合部18aと、この嵌合部18aから屈曲して形成され、径方向内方に延びる内径部18bとを備えている。これにより、ローレット部13が直接外部環境に曝されても芯金18が発錆するのを防止することができる。   In the seal 16 shown in FIG. 6B, the knurled portion 13 is a flat portion of the inner diameter portion 18 b of the core metal 18, and is arranged in a circumferentially equidistant manner at the root portion on the radially outer side of the side lip 12 a. Here, the core metal 18 is formed by pressing a steel plate having corrosion resistance, such as an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). And a cylindrical fitting portion 18a, and an inner diameter portion 18b formed by bending from the fitting portion 18a and extending inward in the radial direction. Thereby, even if the knurl part 13 is directly exposed to an external environment, it can prevent that the metal core 18 rusts.

インナー側のシール9は、図5に示すように、環状のシール板19とスリンガ20とからなる、所謂パックシールを構成している。シール板19は外方部材10に装着された芯金21と、この芯金21に加硫接着により一体に接合されたシール部材22とからなる。芯金21は、冷間圧延鋼鈑(JIS規格のSPCC系等)からプレス加工にて断面略L字状に形成され、外方部材10の端部内周に圧入される円筒状の嵌合部21aと、この嵌合部21aから径方向内方に延びる内径部21bとを有している。シール部材22は、合成ゴム等の弾性部材からなり、径方向外方に傾斜して延びるサイドリップ22aと、二股状に形成された一対のラジアルリップ22b、22cとを有している。   As shown in FIG. 5, the inner-side seal 9 constitutes a so-called pack seal including an annular seal plate 19 and a slinger 20. The seal plate 19 includes a cored bar 21 attached to the outer member 10 and a seal member 22 integrally joined to the cored bar 21 by vulcanization adhesion. The metal core 21 is formed in a substantially L-shaped cross section by press working from a cold rolled steel plate (JIS standard SPCC system or the like), and is a cylindrical fitting portion that is press-fitted into the inner periphery of the end portion of the outer member 10. 21a and an inner diameter portion 21b extending radially inward from the fitting portion 21a. The seal member 22 is made of an elastic member such as synthetic rubber, and includes a side lip 22a extending obliquely outward in the radial direction and a pair of radial lips 22b and 22c formed in a bifurcated shape.

一方、スリンガ20は、内輪3の外径に圧入された円筒部20aと、この円筒部20aから径方向外方に延びる立板部20bを備えている。そして、シール部材22のサイドリップ22aが立板部20bに摺接すると共に、一対のラジアルリップ22b、22cが円筒部20aに摺接している。また、スリンガ20における立板部20bの外縁は、芯金21と僅かな径方向すきまを介して対峙しラビリンスシール23を構成している。   On the other hand, the slinger 20 includes a cylindrical portion 20a that is press-fitted into the outer diameter of the inner ring 3, and a standing plate portion 20b that extends radially outward from the cylindrical portion 20a. The side lip 22a of the seal member 22 is in sliding contact with the upright plate portion 20b, and the pair of radial lips 22b and 22c are in sliding contact with the cylindrical portion 20a. Further, the outer edge of the standing plate portion 20b of the slinger 20 is opposed to the cored bar 21 through a slight radial clearance to form a labyrinth seal 23.

スリンガ20は、フェライト系のステンレス鋼鈑(JIS規格のSUS430系等)やオーステナイト系ステンレス鋼鈑(JIS規格のSUS304系等)、あるいは、防錆処理された冷間圧延鋼鈑(JIS規格のSPCC系等)からプレス加工にて断面が略L字状に形成されている。これにより、スリンガ20が雨水や泥水等に曝されても、また、内輪3との嵌合部に雨水や泥水等が浸入してもスリンガ20が発錆するのを防止することができる。   The slinger 20 is a ferritic stainless steel plate (JIS standard SUS430 series, etc.), austenitic stainless steel plate (JIS standard SUS304 series, etc.), or a rust-proof cold rolled steel plate (JIS standard SPCC). The cross section is formed in a substantially L shape by press working from the system. Thereby, even if the slinger 20 is exposed to rain water, muddy water, or the like, or even if rain water, muddy water or the like enters the fitting portion with the inner ring 3, the slinger 20 can be prevented from rusting.

ここで、図6に示すように、ローレット部24が、芯金21の内径部21bの平坦部で、サイドリップ22aとラジアルリップ22bとの間に周方向等配に配置されている。これにより、芯金21が一部露出していても、サイドリップ22aによって外部から遮蔽され、雨水や泥水等が浸入するのが防止されているので、ローレット部24が直接外部環境に曝されることがなくなり、コストアップすることなく、芯金21が発錆するのを防止することができる。   Here, as shown in FIG. 6, the knurled portion 24 is a flat portion of the inner diameter portion 21 b of the core metal 21, and is arranged in the circumferential direction at equal intervals between the side lip 22 a and the radial lip 22 b. As a result, even if the cored bar 21 is partially exposed, it is shielded from the outside by the side lip 22a and prevents rainwater, muddy water, etc. from entering, so that the knurled portion 24 is directly exposed to the external environment. Thus, the core metal 21 can be prevented from rusting without increasing the cost.

図7に変形例を示す。(a)に示すシール25は、前述したシール9(図6)と基本的にはローレット部24の位置が異なるだけで、その他同一部品同一部位あるいは同一機能を有する部位には同じ符号を付して詳細な説明を省略する。   FIG. 7 shows a modification. The seal 25 shown in (a) is basically different in the position of the knurled portion 24 from the seal 9 (FIG. 6) described above, and other parts having the same parts or the same functions are denoted by the same reference numerals. Detailed description is omitted.

シール25のローレット部26は、芯金21の内径部21bの平坦部で、サイドリップ22aの根元部の径方向外方側に周方向等配に配置されている。このローレット部26は、加硫接着によって芯金21にシール部材22を接合した後、露出した芯金21の表面にシール部材22と同一の材質からなる合成ゴムが接合され、ローレット部26に薄膜26aが形成されている。この薄膜26aからなる遮蔽手段により、芯金21が露出するのを防止し、ローレット部26から芯金21が発錆するのを防止することができる。   The knurled portion 26 of the seal 25 is a flat portion of the inner diameter portion 21b of the core metal 21, and is arranged in a circumferentially uniform manner on the radially outer side of the root portion of the side lip 22a. In the knurled portion 26, a seal member 22 is bonded to the core metal 21 by vulcanization adhesion, and then a synthetic rubber made of the same material as the seal member 22 is bonded to the exposed surface of the core metal 21. 26a is formed. The shielding means made of the thin film 26 a can prevent the cored bar 21 from being exposed and prevent the cored bar 21 from rusting from the knurled portion 26.

(b)に示すシール27は、ローレット部24が、芯金28の内径部28bの平坦部で、サイドリップ22aの径方向外方側の根元部に周方向等配に配置されている。ここでは、芯金28は、オーステナイト系ステンレス鋼鈑(JIS規格のSUS304系等)や防錆処理された冷間圧延鋼鈑(JIS規格のSPCC系等)等、耐食性を有する鋼板等をプレス加工にて形成され、円筒状の嵌合部28aと、この嵌合部28aから屈曲して形成され、径方向内方に延びる内径部28bとを備えている。これにより、ローレット部24が直接外部環境に曝されても芯金28が発錆するのを防止することができる。   In the seal 27 shown in FIG. 6B, the knurled portion 24 is a flat portion of the inner diameter portion 28b of the cored bar 28, and is arranged in a circumferentially equidistant manner at the base portion on the radially outer side of the side lip 22a. Here, the core metal 28 is formed by pressing a steel plate having corrosion resistance, such as an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). And a cylindrical fitting portion 28a and an inner diameter portion 28b formed by bending from the fitting portion 28a and extending inward in the radial direction. Thereby, even if the knurled part 24 is directly exposed to the external environment, the cored bar 28 can be prevented from rusting.

(c)に示すシール29は、基本的には前述したシール9(図6)とシール部材22の構成が一部異なる。このシール部材30は、芯金21の嵌合部21aの端部にまで回り込んで接合されている。これにより、露出した嵌合部21aの端部がシール部材30によって覆われ、芯金28が発錆するのを防止すると共に、この発錆によってシール部材30が芯金21から剥離するのを確実に防止することができる。   The seal 29 shown in (c) basically differs from the above-described seal 9 (FIG. 6) in part in the configuration of the seal member 22. The seal member 30 is wound around and joined to the end of the fitting portion 21 a of the core metal 21. As a result, the exposed end of the fitting portion 21a is covered with the seal member 30 to prevent the cored bar 28 from being rusted, and it is ensured that the seal member 30 is peeled off from the cored bar 21 by this rusting. Can be prevented.

(d)に示すシール31は、シール29(c)の変形例で、芯金32とシール部材33の構成が一部異なる。芯金32は、外方部材(図示せず)に圧入される円筒状の嵌合部32aと、この嵌合部32aから径方向内方に延びる内径部21bとを有している。嵌合部32aの端部34は小径に形成され、シール部材33がこの端部34にまで回り込んで接合されている。そして、シール部材33に尖塔状のリップ33aが形成され、外方部材に弾性接触する。これにより、芯金32が発錆するのを防止すると共に、嵌合部32aの気密性を一層高めることができる。   The seal 31 shown in (d) is a modification of the seal 29 (c), and the structures of the core metal 32 and the seal member 33 are partially different. The cored bar 32 has a cylindrical fitting portion 32a that is press-fitted into an outer member (not shown), and an inner diameter portion 21b that extends radially inward from the fitting portion 32a. The end portion 34 of the fitting portion 32a is formed to have a small diameter, and the seal member 33 wraps around and is joined to the end portion 34. A spire-like lip 33a is formed on the seal member 33 and elastically contacts the outer member. Thereby, while preventing the metal core 32 from rusting, the airtightness of the fitting part 32a can further be improved.

このように、本発明に係る車輪用軸受装置では、シールの製造工程において、ゴム等の弾性部材を加硫接着させてシール部材を芯金に接合する際、芯金を位置決めするための固定ピンの接触部であるローレット部が周方向等配に形成されるが、このローレット部が、前述した種々の遮蔽手段、すなわち、サイドリップや薄膜によって外部から遮断されているので、ローレット部の芯金が露出していても、遮蔽手段によって雨水や泥水等が浸入するのが防止される。したがって、ローレット部が直接外部環境に曝されることがなくなり、コストアップすることなく、芯金が発錆するのを防止してシールの密封性を維持し、軸受寿命を確保することができる。さらに、前述した遮蔽手段に加えて芯金自体が防錆能を有する鋼板から形成されていれば、一層芯金の発錆を確実に防止することができる。   As described above, in the wheel bearing device according to the present invention, the fixing pin for positioning the core metal when the seal member is bonded to the core metal by vulcanizing and bonding an elastic member such as rubber in the seal manufacturing process. The knurled portion, which is a contact portion of the knurled portion, is formed in a circumferentially equidistant manner. This knurled portion is blocked from the outside by the various shielding means described above, that is, side lips and thin films. Even if is exposed, the rainwater, muddy water, etc. are prevented from entering by the shielding means. Therefore, the knurled portion is not directly exposed to the external environment, and without increasing the cost, the cored bar can be prevented from rusting, the sealing performance of the seal can be maintained, and the bearing life can be ensured. Furthermore, if the cored bar itself is formed of a steel plate having a rust-preventing ability in addition to the shielding means described above, the rusting of the cored bar can be prevented more reliably.

以上、本発明の実施の形態について説明を行ったが、本発明はこうした実施の形態に何等限定されるものではなく、あくまで例示であって、本発明の要旨を逸脱しない範囲内において、さらに種々なる形態で実施し得ることは勿論のことであり、本発明の範囲は、特許請求の範囲の記載によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内のすべての変更を含む。   The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

本発明に係る車輪用軸受装置は、芯金と、この芯金に接合されたシール部材とからなるシールが装着された第1世代乃至第4世代構造の車輪用軸受装置に適用できる。   The wheel bearing device according to the present invention can be applied to a wheel bearing device having a first generation to a fourth generation structure in which a seal including a metal core and a seal member joined to the metal core is mounted.

本発明に係る車輪用軸受装置の一実施形態を示す縦断面図である。It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. 図1の一方のシール部を示す要部拡大図である。It is a principal part enlarged view which shows one seal part of FIG. 図2のシール単体を示す拡大断面図である。It is an expanded sectional view which shows the seal | sticker single-piece | unit of FIG. (a)は、図3のシールの変形例を示す拡大断面図である。 (b)は、(a)の他の変形例を示す拡大断面図である。(A) is an expanded sectional view which shows the modification of the seal | sticker of FIG. (B) is an enlarged sectional view showing another modification of (a). 図1の他方のシール部を示す要部拡大図である。It is a principal part enlarged view which shows the other seal part of FIG. 図5のシール単体を示す拡大断面図である。It is an expanded sectional view which shows the seal | sticker single-piece | unit of FIG. (a)〜(d)は、図6のシールの変形例を示す拡大断面図である。(A)-(d) is an expanded sectional view which shows the modification of the seal | sticker of FIG. 従来の車輪用軸受装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. 図8の要部拡大図である。It is a principal part enlarged view of FIG.

符号の説明Explanation of symbols

1・・・・・・・・・・・・・・・・内方部材
2・・・・・・・・・・・・・・・・ハブ輪
2a、3a・・・・・・・・・・・・内側転走面
2b・・・・・・・・・・・・・・・小径段部
2c・・・・・・・・・・・・・・・セレーション
3・・・・・・・・・・・・・・・・内輪
4・・・・・・・・・・・・・・・・車輪取付フランジ
5・・・・・・・・・・・・・・・・ハブボルト
6・・・・・・・・・・・・・・・・転動体
7・・・・・・・・・・・・・・・・保持器
8、14、16・・・・・・・・・・アウター側のシール
9、25、27、29、31・・・・インナー側のシール
10・・・・・・・・・・・・・・・外方部材
10a・・・・・・・・・・・・・・外側転走面
10b・・・・・・・・・・・・・・車体取付フランジ
11、18、21、32・・・・・・芯金
11a、18a、21a、32a・・嵌合部
11b、18b、21b・・・・・・内径部
12、22、30、33・・・・・・シール部材
12a、12b、22a・・・・・・サイドリップ
12c、22b、22c・・・・・・ラジアルリップ
12d、33a・・・・・・・・・・リップ
13、15、24、26・・・・・・ローレット部
15a、26a・・・・・・・・・・薄膜
17・・・・・・・・・・・・・・・基部
19・・・・・・・・・・・・・・・シール板
20・・・・・・・・・・・・・・・スリンガ
20a・・・・・・・・・・・・・・円筒部
20b・・・・・・・・・・・・・・立板部
23・・・・・・・・・・・・・・・ラビリンスシール
34・・・・・・・・・・・・・・・嵌合部の端部
51・・・・・・・・・・・・・・・外方部材
51a・・・・・・・・・・・・・・外側転走面
51b・・・・・・・・・・・・・・車体取付フランジ
52・・・・・・・・・・・・・・・ハブ輪
52a、55a・・・・・・・・・・内側転走面
52b・・・・・・・・・・・・・・小径段部
53・・・・・・・・・・・・・・・車輪取付フランジ
54・・・・・・・・・・・・・・・ハブボルト
55・・・・・・・・・・・・・・・内輪
56・・・・・・・・・・・・・・・ボール
57・・・・・・・・・・・・・・・保持器
58・・・・・・・・・・・・・・・内方部材
59、60・・・・・・・・・・・・シール
61・・・・・・・・・・・・・・・芯金
62・・・・・・・・・・・・・・・シール部材
62a・・・・・・・・・・・・・・サイドリップ
62b・・・・・・・・・・・・・・グリースリップ
62c・・・・・・・・・・・・・・中間リップ
63・・・・・・・・・・・・・・・シール板
64・・・・・・・・・・・・・・・スリンガ
64a・・・・・・・・・・・・・・円筒部
64b・・・・・・・・・・・・・・立板部
65・・・・・・・・・・・・・・・エンコーダ
66・・・・・・・・・・・・・・・ラビリンスシール
67・・・・・・・・・・・・・・・防錆処理層
1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 2a, 3a ・ ・ ・ ・ ・ ・ ・ ・···· Inner rolling surface 2b ·········· Small diameter step 2c ············· Serration 3・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 6 ... Rolling elements 7 ... Cages 8, 14, 16 ... ... Outer side seals 9, 25, 27, 29, 31 ... Inner side seals 10 ... Outer member 10a ...・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 10b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 1, 18, 21, 32... Cores 11a, 18a, 21a, 32a .. Fitting portions 11b, 18b, 21b... Inner diameter portions 12, 22, 30, 33. ... Seal members 12a, 12b, 22a ... Side lips 12c, 22b, 22c ... Radial lips 12d, 33a ... Lips 13, 15, 24 , 26 ······ knurled portions 15a, 26a ·························································· ··································· Slinger 20a ... Standing plate part 23 ... Labyrinth seal 34 ... End 51 of the joint part ..... Outer member 51a ... Outer rolling surface 51b ... Car body mounting flange 52 ... Hub wheels 52a, 55a ... Inner rolling surface 52b ... ········· Small diameter step 53 ··· Wheel mounting flange 54 ··· Hub bolt 55 ... Inner ring 56 ... Ball 57 ... Cage 58 ... Inner member 59, 60 ... Seal 61 ... ... Core 62 ... Sealing member 62a ... Side lip 62b ... Grease lip 62c ... Intermediate lip 63 ... ... Seal plate 64 ... Slinger 64a ... Cylindrical part 64b ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Standing plate 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Encoder 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Labyrinth seal 67・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rust prevention layer

Claims (6)

内周に複列の外側転走面が一体に形成された外方部材と、
外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、
この内方部材と前記外方部材の両転走面間に保持器を介して転動自在に収容された複列の転動体と、
前記外方部材と内方部材との間に形成された環状空間の開口部に装着されたシールとを備えた車輪用軸受装置において、
前記シールが、前記外方部材の端部に内嵌される芯金と、この芯金に接合され、複数のシールリップを有するシール部材とを備え、前記シール部材を加硫接着させて前記芯金に接合する際、この芯金を位置決めした固定ピンの接触部であるローレット部が前記シール部材のシールリップ間に形成されると共に、このローレット部を外部から遮断するためにローレット部が前記芯金の内径部の平坦部でシールリップ間に形成されていることを特徴とする車輪用軸受装置。
An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed on the outer periphery;
A double row rolling element housed between the rolling surfaces of the inner member and the outer member so as to be freely rollable via a cage;
In a wheel bearing device comprising a seal mounted in an opening of an annular space formed between the outer member and the inner member,
The seal includes a core bar fitted into an end of the outer member, and a seal member bonded to the core bar and having a plurality of seal lips, and the seal member is vulcanized and bonded to the core. When joining to gold, a knurled portion, which is a contact portion of a fixing pin that positions the cored bar, is formed between the seal lips of the seal member, and the knurled portion is configured to block the core from the outside. A bearing device for a wheel, which is formed between seal lips at a flat portion of an inner diameter portion of gold .
前記シールが、前記外方部材に内嵌された円筒状の嵌合部、およびこの嵌合部から径方向内方に延びる内径部からなる芯金と、この芯金に加硫接着により一体に接合され、それぞれ異なった長さで径方向外方に傾斜して形成された一対のサイドリップを有するシール部材とからなる一体型のシールで構成されると共に、前記ローレット部が、前記芯金の内径部の平坦部で、前記一対のサイドリップの間に周方向等配に配置されている請求項に記載の車輪用軸受装置。 The seal is integrally formed with a core fitting made of a cylindrical fitting portion fitted into the outer member and an inner diameter portion extending radially inward from the fitting portion by vulcanization bonding. The knurled portion is formed of an integrated seal composed of a seal member having a pair of side lips formed with different lengths and inclined radially outward at different lengths. 2. The wheel bearing device according to claim 1 , wherein the wheel bearing device is a flat portion of the inner diameter portion and is arranged in a circumferentially equidistant manner between the pair of side lips. 前記シールが、前記外方部材に内嵌された円筒状の嵌合部、およびこの嵌合部から径方向内方に延びる内径部からなる芯金と、この芯金に加硫接着により一体に接合され、径方向外方に傾斜して延びるサイドリップ、およびラジアルリップを有するシール部材とからなる環状のシール板と、このシール板に対向配置され、前記内方部材に外嵌され、前記ラジアルリップが摺接する円筒部、およびこの円筒部から径方向外方に延び、前記サイドリップが摺接される立板部からなるスリンガとで構成されると共に、前記ローレット部が、前記芯金の内径部の平坦部で、前記サイドリップとラジアルリップとの間に周方向等配に配置されている請求項に記載の車輪用軸受装置。 The seal is integrally formed with a core fitting made of a cylindrical fitting portion fitted into the outer member and an inner diameter portion extending radially inward from the fitting portion by vulcanization bonding. are joined, the side lip extending obliquely radially outward, and an annular seal plate comprising a sealing member having and La Jiarurippu, are opposed to the seal plate, is fitted to said inner member, The radial lip is slidably in contact with the cylindrical portion, and the slinger is formed of a vertical plate extending radially outward from the cylindrical portion and the side lip is slidably in contact with the knurl portion. of the flat portion of the inner diameter portion, a wheel bearing apparatus of claim 1 arranged circumferentially equidistant between the side lip and a radial lip. 前記シール部材が前記芯金の嵌合部の端部に回り込んで接合されている請求項1乃至3いずれかに記載の車輪用軸受装置。 The wheel bearing device according to any one of claims 1 to 3, wherein the seal member is wound around and joined to an end of the fitting portion of the core metal. 前記芯金の嵌合部の端部に尖塔状に突出した環状のリップが形成され、前記外方部材の端部内周に弾性接触されている請求項に記載の車輪用軸受装置。 The wheel bearing device according to claim 4 , wherein an annular lip projecting in a spire shape is formed at an end of the fitting portion of the cored bar, and is in elastic contact with the inner periphery of the end of the outer member. 前記芯金が防錆能を有する鋼板から形成されている請求項1乃至5いずれかに記載の車輪用軸受装置。
The wheel bearing device according to any one of claims 1 to 5, wherein the core metal is formed of a steel plate having antirust performance.
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