JP2007032640A - Bearing unit for wheel - Google Patents

Bearing unit for wheel Download PDF

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Publication number
JP2007032640A
JP2007032640A JP2005214553A JP2005214553A JP2007032640A JP 2007032640 A JP2007032640 A JP 2007032640A JP 2005214553 A JP2005214553 A JP 2005214553A JP 2005214553 A JP2005214553 A JP 2005214553A JP 2007032640 A JP2007032640 A JP 2007032640A
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Japan
Prior art keywords
wheel
sliding contact
hub
seal lip
bearing unit
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JP2005214553A
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Japanese (ja)
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JP2007032640A5 (en
Inventor
Takayuki Miyagawa
貴之 宮川
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NSK Ltd
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NSK Ltd
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Priority to JP2005214553A priority Critical patent/JP2007032640A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7826—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of the opposing surface cooperating with the seal, e.g. a shoulder surface of a bearing ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
    • F16C33/7876—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing unit for a wheel capable of maintaining high sealing performance by preventing easy fixing of mud to a tip neighborhood and a counterpart face of a seal lip slidably contacting in an axial direction of a sealing device, and eliminating contact in portions other than a sliding part of the seal lip tip even when there is fixing of mud. <P>SOLUTION: The bearing unit O for a wheel has a hub 3, an outer ring 1, a plurality of rolling elements 10 arranged so as to roll between the hub 3 and the outer ring 1, and the sealing devices 12a, 12b having axial seal lips 23a, 32a attached to one of the hub 3 or the outer ring 1, and slidably contacting a slinger 22 and a hub ring 4 provided in a side of the other. The slinger 22 and the hub ring 4 slidably contacting the axial seal lips 23a, 32a are formed such that radial outward portions than sliding contact positions of the axial seal lips 23a, 32a are positioned axially outward than the sliding contact positions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、自動車等の車輪を懸架装置に対して回転自在に支持するための車輪用軸受ユニットに関する。   The present invention relates to a wheel bearing unit for rotatably supporting a wheel of an automobile or the like with respect to a suspension device.

従来の車輪用軸受ユニットでは、車両走行時或いは停止時において、雨水、水道水（洗車時）、泥水（未舗装路走行時）、塩水（寒冷地走行時）、水蒸気等の水分の影響を受けやすい。このような外部からの水、泥、塵等の異物の侵入を防止するために、例えば、駆動輪用の軸受ユニットでは、懸架装置に固定される外輪（固定輪）と車輪とともに回転するハブ（回転輪）との間に構成される軸受の軸受空間内をシールする密封装置が設けられている（例えば、特許文献１参照。）。   Conventional wheel bearing units are affected by moisture such as rainwater, tap water (when washing a car), muddy water (when running on an unpaved road), salt water (when driving in a cold region), and water vapor when the vehicle is running or stopped. Cheap. In order to prevent the entry of foreign matter such as water, mud, and dust from the outside, for example, in a bearing unit for a drive wheel, an outer ring (fixed wheel) fixed to a suspension device and a hub that rotates together with the wheel ( A sealing device that seals the inside of the bearing space of the bearing formed between the rotating wheel and the rotating wheel is provided (see, for example, Patent Document 1).

具体的に、図１０〜１２に示すように、外輪１０１とハブ１０２との間のインボード側端部（自動車への組み付け状態で車幅方向内側の端部）には密封装置１０３が設けられ、図１３に示すように、アウトボード側端部（自動車への組み付け状態で車幅方向外側の端部）には密封装置１０４が設けられている。   Specifically, as shown in FIGS. 10 to 12, a sealing device 103 is provided at an end portion on the inboard side between the outer ring 101 and the hub 102 (an end portion on the inner side in the vehicle width direction when assembled to the automobile). As shown in FIG. 13, a sealing device 104 is provided at the end portion on the outboard side (the end portion on the outer side in the vehicle width direction when assembled to the automobile).

これにより、車輪用軸受ユニットの軸受空間の軸方向両端部開口をシールして、外部からの塵埃、水、泥水等の軸受空間への浸入を防止するとともに、封入グリースの漏洩を防止する。   This seals both axial ends of the bearing space of the wheel bearing unit in the axial direction so as to prevent dust, water, muddy water, etc. from entering the bearing space from the outside, and leakage of the encapsulated grease.

密封装置１０３は、図１０に示すように、外輪１０１のインボード側端部の内周面に嵌合される芯金１０５と、ハブ１０２のインボード側端部の外周面に嵌合されるスリンガ１０６と、芯金１０５に接着固定されてスリンガ１０６に摺接するシール部材１０７とを備えている。シール部材１０７は、図示の例では、スリンガ１０６に対して軸方向に摺接する１つのアキシアルシールリップ１０８と、径方向に摺接する１つのラジアルシールリップ１０９とを有している。   As shown in FIG. 10, the sealing device 103 is fitted to the core metal 105 fitted to the inner peripheral surface of the inboard side end portion of the outer ring 101 and the outer peripheral surface of the inboard side end portion of the hub 102. A slinger 106 and a seal member 107 that is bonded and fixed to the metal core 105 and is in sliding contact with the slinger 106 are provided. In the illustrated example, the seal member 107 has one axial seal lip 108 that is in sliding contact with the slinger 106 in the axial direction, and one radial seal lip 109 that is in sliding contact with the radial direction.

また、近年では、回転輪側であるハブ１０２の外周面に嵌合されるスリンガ１０６の軸受外面側に、例えば、図１１及び図１２に示すように、車両のＡＢＳ用のセンサ等として使用される磁気エンコーダ（例えばゴム磁石等）１１０を接着固定したものが増加している。   Further, in recent years, as shown in FIGS. 11 and 12, it is used as a sensor for an ABS of a vehicle on the bearing outer surface side of the slinger 106 fitted to the outer peripheral surface of the hub 102 on the rotating wheel side. The number of magnetic encoders (for example, rubber magnets) 110 that are bonded and fixed is increasing.

一方、密封装置１０３は、図１３に示すように、外輪１０１のアウトボード側端部の内周面に嵌合される芯金１１１と、該芯金１１１に接着固定されてハブ１０２に摺接するシール部材１１２とを備えている。シール部材１１２は、図示の例では、ハブ１０２の車輪取り付けフランジの側面に対して軸方向に摺接する２つのアキシアルシールリップ１１３，１１４と、ハブ１０２の外周面に対して径方向に摺接する１つのラジアルシールリップ１１５とを有している。
特開２００２−６１６６０号公報 On the other hand, as shown in FIG. 13, the sealing device 103 has a metal core 111 fitted to the inner peripheral surface of the end portion on the outboard side of the outer ring 101, and is adhesively fixed to the metal core 111 and is in sliding contact with the hub 102. And a seal member 112. In the illustrated example, the seal member 112 includes two axial seal lips 113 and 114 that are in sliding contact with the side surface of the wheel mounting flange of the hub 102 in the axial direction, and 1 that is in sliding contact with the outer peripheral surface of the hub 102 in the radial direction. Two radial seal lips 115.
JP 2002-61660 A

ところで、従来の車輪用軸受ユニットにおいては、車両の車軸が水没するような状況での使用や、軸受のがたつき、また、長年の使用による密封装置１０３，１０４の劣化等により、密封装置１０３，１０４の機能が低下して、車輪用軸受ユニットの軸受空間内に水が浸入する場合がある。車輪用軸受ユニットの内部に水が浸入すると、外輪１０１及びハブ１０２と転動体との間に存在するグリースの油膜が破断され、金属接触状態が発生する。   By the way, in the conventional wheel bearing unit, the sealing device 103 is used due to use in a situation where the axle of the vehicle is submerged, shakiness of the bearing, deterioration of the sealing devices 103 and 104 due to long-term use, and the like. , 104 may deteriorate, and water may enter the bearing space of the wheel bearing unit. When water enters the inside of the wheel bearing unit, the oil film of grease existing between the outer ring 101 and the hub 102 and the rolling elements is broken, and a metal contact state is generated.

自動車は、走行状態と停止状態を繰り返しており、特に、泥水環境下での走行後は密封装置１０３，１０４が密封性を維持し、軸受内部への泥水の浸入を阻止したとしても、アキシアルシールリップ１０８，１１３の先端近傍には、泥水が堆積することになる。   The automobile repeats a running state and a stopped state. In particular, after the running in a muddy water environment, even if the sealing devices 103 and 104 maintain the sealing performance and prevent the muddy water from entering the bearing, the axial seal Muddy water accumulates in the vicinity of the tips of the lips 108 and 113.

また、泥水環境下での走行後に停止状態が長く続けば、アキシアルシールリップ１０８，１１３先端近傍に堆積した泥水は乾燥し、アキシアルシールリップ１０８，１１３及びアキシアルシールリップ１０８，１１３が摺接する相手面に固着する。このような泥水環境下での走行と停止を繰り返すことにより、アキシアルシールリップ１０８，１１３及び相手面に、図１０〜図１３に示す泥１２０が大量に固着することになる。特に、図１２に示すように、ハブ１０２側のスリンガ１０６の軸受外面側に設けられた磁気エンコーダ１１０がスリンガ１０６の外周部に巻き付いたタイプでは、この巻き付き部に泥１２０が固着しやすくなる。   In addition, if the stop state continues for a long time after traveling in a muddy water environment, the muddy water accumulated near the tips of the axial seal lips 108 and 113 is dried, and the other surface on which the axial seal lips 108 and 113 and the axial seal lips 108 and 113 are in sliding contact with each other. It sticks to. By repeatedly running and stopping in such a muddy water environment, a large amount of mud 120 shown in FIGS. 10 to 13 adheres to the axial seal lips 108 and 113 and the mating surface. In particular, as shown in FIG. 12, in the type in which the magnetic encoder 110 provided on the bearing outer surface side of the slinger 106 on the hub 102 side is wound around the outer peripheral portion of the slinger 106, the mud 120 is easily fixed to the wound portion.

このように泥１２０が大量に固着した状態でアキシアルシールリップ１０８，１１３が摺接すると、アキシアルシールリップ１０８，１１３の先端摺接部以外の部分が固着した大量の泥１２０と接触し、本来の摺接するはずのアキシアルシールリップ１０８，１１３の先端が浮いた状態となり、密封性が維持されないという問題が発生する。   When the axial seal lips 108 and 113 are in sliding contact with the mud 120 being fixed in a large amount in this way, the portions other than the tip sliding contact portions of the axial seal lips 108 and 113 are in contact with the large amount of mud 120 to which the axial seal lips 108 and 113 are fixed. The ends of the axial seal lips 108 and 113 that should be in sliding contact with each other are in a floating state, and there is a problem that the sealing performance is not maintained.

また、アキシアルシールリップ１０８，１１３の先端摺接部以外の部分と固着した大量の泥１２０との摺接部の摩擦が大きくなって、トルクの増大や摩耗が促進され、自動車の燃費性能や加速性能を中心とする車両の走行性能に悪影響を及ぼす原因となる。   In addition, the friction of the sliding contact portion between the axial seal lips 108 and 113 other than the tip sliding contact portion and the large amount of mud 120 fixed increases the torque and wear, and the fuel efficiency and acceleration of the vehicle are increased. It becomes a cause of adversely affecting the running performance of the vehicle centering on the performance.

本発明は、このような不都合を解消するためになされたものであり、密封装置のシールリップの先端近傍及び該シールリップが軸方向に摺接する相手面に泥等の異物が固着しにくくするとともに、泥等の異物が固着したとしても、シールリップ先端の摺接部以外の部分での接触をなくして、高い密封性を維持することができる車輪用軸受ユニットを提供することを目的とする。   The present invention has been made to eliminate such inconveniences, and makes it difficult for foreign matter such as mud to adhere to the vicinity of the tip of the seal lip of the sealing device and the mating surface where the seal lip slides in the axial direction. An object of the present invention is to provide a wheel bearing unit capable of maintaining high sealing performance by eliminating contact at a portion other than a sliding contact portion at the tip of a seal lip even if foreign matter such as mud adheres.

本発明の上記目的は、以下の構成によって達成される。
（１） 回転輪と、固定輪と、該回転輪と該固定輪との間に転動自在に配置される複数の転動体と、前記回転輪と前記固定輪の一方に装着され、且つ、他方の側に設けられた相手面と摺接するシールリップを有する密封装置と、を有する車輪用軸受ユニットであって、
前記シールリップと摺接する前記相手面は、前記シールリップの摺接位置より径方向外方部位が、前記摺接位置より軸方向外方に位置するように形成されることを特徴とする車輪用軸受ユニット。 The above object of the present invention is achieved by the following configurations.
(1) A rotating wheel, a fixed wheel, a plurality of rolling elements that are rotatably arranged between the rotating wheel and the fixed wheel, one of the rotating wheel and the fixed wheel, and A wheel bearing unit having a sealing device having a seal lip that is in sliding contact with a mating surface provided on the other side,
For the wheel, the mating surface that is in sliding contact with the seal lip is formed such that a radially outer portion is positioned axially outward from the sliding contact position from the sliding contact position of the seal lip. Bearing unit.

本発明の車輪用軸受ユニットによれば、シールリップと摺接する相手面は、シールリップとの摺接位置より径方向外方部位が、摺接位置より軸方向外方に位置するように形成されるので、シールリップ先端近傍及びシールリップと摺接する相手面に泥等の異物が固着しにくくなる。   According to the wheel bearing unit of the present invention, the mating surface that is in sliding contact with the seal lip is formed such that the radially outer portion is positioned axially outward from the sliding contact position with respect to the seal lip. Therefore, it becomes difficult for foreign matters such as mud to adhere to the vicinity of the tip of the seal lip and the mating surface in sliding contact with the seal lip.

また、泥等の異物が固着したとしても、シールリップ先端の摺接部以外の部分での接触がなくなるため、高い密封性を維持することができるとともに、シールリップの低摩擦化及び低摩耗化が図れて、燃費性能や加速性能を中心とする車両の走行性能の向上を図ることができる。   Moreover, even if foreign matter such as mud adheres, contact with the portion other than the sliding contact portion at the tip of the seal lip is eliminated, so that high sealing performance can be maintained, and friction and wear of the seal lip are reduced. Therefore, it is possible to improve the running performance of the vehicle centering on the fuel efficiency performance and the acceleration performance.

以下、本発明の車輪用軸受ユニットの一実施形態について図面を参照して詳細に説明する。本実施形態の車輪用軸受ユニットＯは駆動輪用とされており、外輪１（固定輪）及びハブ（回転輪）３と、複数の転動体１０とを備えている。   Hereinafter, an embodiment of a wheel bearing unit of the present invention will be described in detail with reference to the drawings. The wheel bearing unit O of the present embodiment is for a drive wheel, and includes an outer ring 1 (fixed wheel) and a hub (rotating wheel) 3, and a plurality of rolling elements 10.

ハブ３は、中空状のハブ輪４を備えており、ハブ輪４は、その外周面のアウトボード側端部（自動車への組み付け状態で車幅方向外側の端部：図１の左端部）に径方向外方に延びる車輪取り付けフランジ７を有している。車輪取り付けフランジ７には、そのアウトボード側の側面に車輪を構成する図示しないホイール及びブレーキロータ等を取り付けるためのスタッド７ａが周方向に略等間隔で複数植設されている。   The hub 3 includes a hollow hub wheel 4, and the hub wheel 4 is an end portion on the outboard side of the outer peripheral surface (an end portion on the outer side in the vehicle width direction in the assembled state in the automobile: the left end portion in FIG. 1). Has a wheel mounting flange 7 extending radially outward. A plurality of studs 7a for mounting a wheel, a brake rotor, and the like (not shown) constituting the wheel are implanted in the wheel mounting flange 7 at substantially equal intervals in the circumferential direction.

ハブ輪４のインボード側端部（自動車への組み付け状態で車幅方向内側の端部：図１の右端部）には小径段部４ａが形成されており、該小径段部４ａには内輪５が嵌め込まれている。内輪５の外周面には内輪軌道面９が形成され、また、ハブ輪４の軸方向の中間部外周面にも内輪軌道面９が形成されている。   A small-diameter step portion 4a is formed at an end portion on the inboard side of the hub wheel 4 (the end portion on the inner side in the vehicle width direction in the assembled state in the automobile: the right end portion in FIG. 1). 5 is fitted. An inner ring raceway surface 9 is formed on the outer circumferential surface of the inner ring 5, and an inner ring raceway surface 9 is also formed on the outer circumferential surface of the intermediate portion in the axial direction of the hub ring 4.

外輪１の内周面にはハブ輪４の内輪軌道面９に対応する外輪軌道面８及び内輪５の内輪軌道面９に対応する外輪軌道面８が形成されており、また、車輪取り付けフランジ７から離間する側の外輪１の外周部には径方向外方に延びる懸架装置取り付けフランジ２が設けられている。   An outer ring raceway surface 8 corresponding to the inner ring raceway surface 9 of the hub ring 4 and an outer ring raceway surface 8 corresponding to the inner ring raceway surface 9 of the inner ring 5 are formed on the inner peripheral surface of the outer ring 1. A suspension mounting flange 2 extending radially outward is provided on the outer peripheral portion of the outer ring 1 on the side away from the outer ring 1.

そして、複列の内輪軌道面９と複列の外輪軌道面８との間に、それぞれ複数の転動体１０が保持器１１を介して周方向に転動可能に配設されている。また、外輪１とハブ３との間のインボード側端部には密封装置１２ａが設けられ、アウトボード側端部には密封装置１２ｂが設けられており、車輪用軸受ユニットの軸受空間の軸方向両端部開口をシールして、外部からの塵埃、水、泥水等の軸受空間への浸入を防止するとともに、封入グリースの漏洩を防止する。   A plurality of rolling elements 10 are arranged between the double row inner ring raceway surface 9 and the double row outer ring raceway surface 8 so as to be able to roll in the circumferential direction via a cage 11. In addition, a sealing device 12a is provided at the inboard side end between the outer ring 1 and the hub 3, and a sealing device 12b is provided at the outboard side end, and the shaft of the bearing space of the wheel bearing unit is provided. The openings at both ends in the direction are sealed to prevent dust, water, muddy water, etc. from entering the bearing space from outside, and leakage of the encapsulated grease.

尚、図示の例では、転動体１０として玉を使用しているが、重量の嵩む車輪支持用軸受ユニットの場合には、転動体１０としてテーパころを使用する場合もある。   In the illustrated example, a ball is used as the rolling element 10. However, in the case of a wheel supporting bearing unit that is heavy in weight, a tapered roller may be used as the rolling element 10.

上述の様な車輪用軸受ユニットＯを自動車に組み付けるには、固定輪側の外輪１の懸架装置取り付けフランジ２を懸架装置に固定し、回転輪側のハブ３の車輪取り付けフランジ７にスタッド７ａやナット（図示せず）等を介してブレーキロータ及びホイールを固定する。これにより、車輪を懸架装置に対して回転自在に支持することができる。   In order to assemble the wheel bearing unit O as described above to an automobile, the suspension device mounting flange 2 of the outer ring 1 on the fixed wheel side is fixed to the suspension device, and the stud 7a or the like is attached to the wheel mounting flange 7 of the hub 3 on the rotating wheel side. The brake rotor and the wheel are fixed via a nut (not shown) or the like. Thereby, a wheel can be rotatably supported with respect to a suspension apparatus.

密封装置１２ａは、図２に示すように、外輪１のインボード側端部の内周面に嵌合される芯金２１と、内輪５のインボード側端部の外周面に嵌合されるスリンガ２２と、芯金２１に接着固定されてスリンガ２２に摺接するシール部材２３とを備えている。   As shown in FIG. 2, the sealing device 12 a is fitted to a cored bar 21 fitted to the inner peripheral surface of the inboard side end portion of the outer ring 1 and an outer peripheral surface of the inboard side end portion of the inner ring 5. A slinger 22 and a seal member 23 that is adhered and fixed to the core metal 21 and is in sliding contact with the slinger 22 are provided.

芯金２１は、外輪１のインボード側の端部内周面に内嵌固定される外径側円筒部２４と、この外径側円筒部２４の軸方向内端緑（図２の左端縁）から径方向内方に延びる内側円環部２５とを有して断面略Ｌ字形状に形成されている。一方、スリンガ２２は、内輪５の外周面に外嵌される内径側円筒部２６と、この内径側円筒部２６の軸方向外端縁（図２の右端縁）から径方向外方に延びる外側円環部２７とを有して断面Ｌ字形状に形成されている。   The core metal 21 includes an outer diameter side cylindrical portion 24 that is fitted and fixed to the inner peripheral surface of the end portion on the inboard side of the outer ring 1, and an inner end green in the axial direction of the outer diameter side cylindrical portion 24 (left end edge in FIG. 2) And an inner annular portion 25 extending inward in the radial direction. On the other hand, the slinger 22 has an inner diameter side cylindrical portion 26 fitted on the outer peripheral surface of the inner ring 5 and an outer side extending radially outward from an axial outer end edge (right end edge in FIG. 2) of the inner diameter side cylindrical portion 26. It has an annular portion 27 and is formed in an L-shaped cross section.

シール部材２３は合成ゴム等により形成されており、スリンガ２２の外側円環部２７に対して軸方向に摺接する１つのアキシアルシールリップ２３ａと、内径側円筒部２６に対して径方向に摺接する１つのラジアルシールリップ２３ｂとを有している。また、スリンガ３２の外側円環部２７の軸方向外側側面には、例えば、車両のＡＢＳ用のセンサ等として使用される磁気エンコーダ２８が接着等により固定されている。   The seal member 23 is formed of synthetic rubber or the like, and is in slidable contact with the outer ring portion 27 of the slinger 22 in the axial direction with one axial seal lip 23 a slidably contacted with the inner cylindrical portion 26 in the radial direction. It has one radial seal lip 23b. Further, a magnetic encoder 28 used as an ABS sensor or the like of the vehicle is fixed to the outer side surface in the axial direction of the outer ring portion 27 of the slinger 32 by adhesion or the like.

一方、密封装置１２ｂは、図３に示すように、外輪１のアウトボード側の端部内周面に嵌合される断面略Ｌ字形状の芯金３１と、該芯金３１に接着等により固定されて、ハブ輪４に摺接するシール部材３２とを備えている。シール部材３２は、ハブ輪４の車輪取り付けフランジ７の側面に対して軸方向に摺接する上下２つのアキシアルシールリップ３２ａ，３２ｂと、ハブ輪４の外周面に対して径方向に摺接する１つのラジアルシールリップ３２ｃとを有している。   On the other hand, as shown in FIG. 3, the sealing device 12 b is fixed to the core metal 31 by an adhesive or the like, and a core metal 31 having a substantially L-shaped cross section that is fitted to the inner peripheral surface of the end portion on the outboard side of the outer ring 1. And a seal member 32 slidably in contact with the hub wheel 4. The seal member 32 includes two upper and lower axial seal lips 32 a and 32 b that are in sliding contact with the side surface of the wheel mounting flange 7 of the hub wheel 4 in the axial direction, and one that is in sliding contact with the outer peripheral surface of the hub wheel 4 in the radial direction. And a radial seal lip 32c.

ここで、本実施形態では、インボード側の密封装置１２ａのアキシアルシールリップ２３ａの先端が摺接する相手面であるスリンガ２２の外側円環部２７の軸方向内側面において、アキシアルシールリップ２３ａの軸方向の摺接位置より径方向外方部位に、図１に示すように、段部４０を形成し、これにより、密封装置１２ａにおける相手面のアキシアルシールリップ２３ａの摺接位置より径方向外方部位を、該摺接位置より軸方向外方に配置している。また、磁気エンコーダ２８の外周部における軸方向内端面２８ａも段部４０の軸方向側面４０ａと連続して形成され、摺接位置より軸方向外方に配置されている。   Here, in the present embodiment, the shaft of the axial seal lip 23a is formed on the inner surface in the axial direction of the outer annular portion 27 of the slinger 22 that is a mating surface with which the tip of the axial seal lip 23a of the inboard side sealing device 12a is in sliding contact. As shown in FIG. 1, a step portion 40 is formed in a radially outward portion from the sliding contact position in the direction, thereby radially outward from the sliding contact position of the mating axial seal lip 23a in the sealing device 12a. The part is arranged axially outward from the sliding contact position. Further, the axial inner end surface 28a in the outer peripheral portion of the magnetic encoder 28 is also formed continuously with the axial side surface 40a of the stepped portion 40, and is disposed axially outward from the sliding contact position.

また、アウトボード側の密封装置１２ｂの上側のアキシアルシールリップ３２ａの先端が摺接する相手面であるハブ輪４の車輪取り付けフランジ７の側面において、アキシアルシールリップ３２ａの軸方向の摺接位置より径方向外方部位に、図３に示すように、段部５０を形成し、これにより、密封装置１２ｂにおける相手面のアキシアルシールリップ３２ａの摺接位置より径方向外方部位を、該摺接位置より軸方向外方に配置している。   Further, on the side surface of the wheel mounting flange 7 of the hub wheel 4 that is the mating surface with which the tip of the upper axial seal lip 32a of the sealing device 12b on the outboard side is in sliding contact, the diameter is larger than the axial sliding contact position of the axial seal lip 32a. As shown in FIG. 3, a step portion 50 is formed on the outer side portion in the direction, whereby the outer side portion in the radial direction is moved from the sliding contact position of the opposite axial seal lip 32a in the sealing device 12b to the sliding contact position. It is arranged more outward in the axial direction.

このように、本実施形態では、密封装置１２ａ，１２ｂのアキシアルシールリップ２３ａ，３２ａと摺接する相手面となるスリンガ２７及びハブ４は、アキシアルシールリップ２３ａ，３２ａとの摺接位置より径方向外方部位が、段差４０，５０によって、摺接位置より軸方向外方に位置するように形成されるので、アキシアルシールリップ２３ａ，３２ａの先端近傍及びアキシアルシールリップと摺接する相手面となるスリンガ２７及びハブ４に泥等の異物が固着しにくくなる。   As described above, in this embodiment, the slinger 27 and the hub 4 that are the mating surfaces that come into sliding contact with the axial seal lips 23a and 32a of the sealing devices 12a and 12b are radially outward from the sliding contact positions with the axial seal lips 23a and 32a. Since the one side portion is formed by the steps 40 and 50 so as to be located outward in the axial direction from the sliding contact position, the slinger 27 which becomes the mating surface near the tip of the axial seal lips 23a and 32a and the axial seal lip. And it becomes difficult for foreign matters such as mud to adhere to the hub 4.

また、泥等の異物が固着したとしても、アキシアルシールリップ２３ａ，３２ａ先端の摺接部以外の部分での泥との接触がなくなるため、高い密封性を維持することができるとともに、アキシアルシールリップ２３ａ，３２ａの低摩擦化及び低摩耗化が図れて、燃費性能や加速性能を中心とする車両の走行性能の向上を図ることができる。   In addition, even if foreign matter such as mud adheres, contact with mud at portions other than the sliding contact portions at the tips of the axial seal lips 23a and 32a is eliminated, so that high sealing performance can be maintained and the axial seal lip is maintained. It is possible to reduce the friction and wear of 23a and 32a, and to improve the running performance of the vehicle centering on the fuel efficiency performance and the acceleration performance.

なお、本発明の上記実施形態に限定されるものでなく、本発明の要旨を逸脱しない範囲において適宜変更可能である。   In addition, it is not limited to the said embodiment of this invention, In the range which does not deviate from the summary of this invention, it can change suitably.

本実施形態では、インボード側の密封装置１２ａにおける相手面のアキシアルシールリップ２３ａの摺接位置より径方向外方部位を、段部４０を形成することで、該摺接位置より軸方向外方に配置するようにしているが、段部４０に代えて、図３に示すような斜面部４１や、図４に示すような凸円弧部４２、或いは、図５に示すような凹円弧部４３によって形成してもよい。また、これらの場合においても、磁気エンコーダ２８の外周部における軸方向内端面２８ａは、これらの軸方向側面と連続して形成される。   In this embodiment, by forming the step portion 40 in the radially outward portion from the sliding contact position of the mating axial seal lip 23a in the sealing device 12a on the inboard side, it is axially outward from the sliding contact position. However, instead of the stepped portion 40, the slope portion 41 as shown in FIG. 3, the convex arc portion 42 as shown in FIG. 4, or the concave arc portion 43 as shown in FIG. May be formed. Also in these cases, the axial inner end surface 28a at the outer peripheral portion of the magnetic encoder 28 is formed continuously with these axial side surfaces.

また、アウトボード側の密封装置１２ｂにおいても、相手面のアキシアルシールリップ３２ａの摺接位置より径方向外方部位に、段部５０を形成することで、該摺接位置より軸方向外方に配置するようにしているが、段部５０に代えて、図６に示すような斜面部５１や、図７に示すような凸円弧部５２、或いは、図８に示すような凹円弧部５３によって形成してもよい。   Further, also in the sealing device 12b on the outboard side, by forming the step portion 50 in the radially outward portion from the sliding contact position of the mating axial seal lip 32a, it is axially outward from the sliding contact position. However, instead of the stepped portion 50, a slope portion 51 as shown in FIG. 6, a convex arc portion 52 as shown in FIG. 7, or a concave arc portion 53 as shown in FIG. It may be formed.

また、本実施形態では、内輪回転の駆動輪用の車輪用軸受ユニットに本発明を適用した場合を例示したが、これに代えて、内輪回転の従動輪用の車輪用軸受ユニット他、外輪回転の従動輪用及び駆動輪用の車輪用軸受ユニットに本発明を適用してもよい。   Further, in the present embodiment, the case where the present invention is applied to the wheel bearing unit for the driving wheel for the inner ring rotation is illustrated, but instead, the wheel bearing unit for the driven wheel for the inner ring rotation, the outer ring rotation, and the like. The present invention may be applied to a wheel bearing unit for a driven wheel and a drive wheel.

さらに、本実施形態では、インボード側の密封装置１２ａに磁気エンコーダ２８を設けた場合を例示したが、磁気エンコーダ２８を設けないタイプのインボード側の密封装置に本発明を適用してもよいのは勿論である。   Furthermore, in this embodiment, the case where the magnetic encoder 28 is provided in the sealing device 12a on the inboard side is illustrated, but the present invention may be applied to a sealing device on the inboard side in which the magnetic encoder 28 is not provided. Of course.

図１（実施例１）、図１１（従来例１）、図１２（従来例２）の各インボード側の密封装置を用いて、泥水環境下での寿命試験を行った結果を示す。なお、試験条件は、回転速度２０００ｍｉｎ-1とし、浸漬と乾燥、回転と停止をそれぞれ組み合わせたパターンによるサイクル試験とした。試験結果を表１に示す。 The result of having performed the life test in a muddy water environment using the sealing device of each inboard side of FIG. 1 (Example 1), FIG. 11 (Conventional example 1), and FIG. 12 (Conventional example 2) is shown. The test conditions were a rotational speed of 2000 min −1 and a cycle test using a pattern in which immersion, drying, rotation, and stop were combined. The test results are shown in Table 1.

Figure 2007032640
Figure 2007032640

従来例２のように、磁気エンコーダ１１０がスリンガ１０６の外周部に巻き付いたタイプでは、この巻き付き部に泥が固着しやすく、短時間で泥水が浸入し、寿命が大幅に短くなるのが判る。従来例１では、従来例２に比べると寿命が延びてはいるが、やはりアキシアルシールリップ１０８の先端近傍に泥が堆積、固着していることが試験後の観察から判明した。   It can be seen that in the type in which the magnetic encoder 110 is wound around the outer periphery of the slinger 106 as in Conventional Example 2, mud is easily fixed to the wound portion, and muddy water enters in a short time, and the life is significantly shortened. Although the life of the conventional example 1 was longer than that of the conventional example 2, it was found from observation after the test that mud was accumulated and fixed in the vicinity of the tip of the axial seal lip 108.

これに対し、実施例１では、寿命が大幅に延びており、試験後の観察でもアキシアルシールリップ２３ａの先端近傍への泥の堆積、固着がほとんど見られなかった。   On the other hand, in Example 1, the lifetime was significantly extended, and even when observed after the test, there was hardly any mud accumulation or adhesion near the tip of the axial seal lip 23a.

本発明の一実施形態に係る車輪用軸受ユニットを説明するための断面図である。It is sectional drawing for demonstrating the wheel bearing unit which concerns on one Embodiment of this invention. 図１の車輪用軸受ユニットのインボード側の密封装置を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the sealing device by the side of the inboard of the wheel bearing unit of FIG. 図１の車輪用軸受ユニットのアウトボード側の密封装置を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the sealing device by the side of the outboard of the bearing unit for wheels of FIG. インボード側密封装置のシールリップが摺接する相手面の第１変形例を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the 1st modification of the other surface which the seal lip of an inboard side sealing device slidably contacts. インボード側密封装置のシールリップが摺接する相手面の第２変形例を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the 2nd modification of the other surface which the seal lip of an inboard side sealing device slidably contacts. インボード側密封装置のシールリップが摺接する相手面の第３変形例を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the 3rd modification of the other surface which the seal lip of an inboard side sealing device slidably contacts. アウトボード側密封装置のシールリップが摺接する相手面の第１変形例を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the 1st modification of the other party surface which the seal lip of an outboard side sealing device slidably contacts. アウトボード側密封装置のシールリップが摺接する相手面の第２変形例を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the 2nd modification of the other surface which the seal lip of an outboard side sealing device slidably contacts. アウトボード側密封装置のシールリップが摺接する相手面の第３変形例を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the 3rd modification of the other surface which the seal lip of an outboard side sealing device slidably contacts. 従来のインボード側密封装置を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the conventional inboard side sealing device. 従来のインボード側密封装置を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the conventional inboard side sealing device. 従来のインボード側密封装置を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the conventional inboard side sealing device. 従来のアウトボード側密封装置を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the conventional outboard side sealing device.

符号の説明Explanation of symbols

１ 外輪（固定輪）
３ ハブ（回転輪）
１０ 転動体
１２ａ インボード側密封装置
１２ｂ アウトボード側密封装置
２３ａ アキシアルシールリップ
３２ａ アキシアルシールリップ
４０，５０ 段部 1 Outer ring (fixed ring)
3 Hub (rotating wheel)
DESCRIPTION OF SYMBOLS 10 Rolling body 12a Inboard side sealing device 12b Outboard side sealing device 23a Axial seal lip 32a Axial seal lip 40, 50 Step

Claims (1)

回転輪と、固定輪と、該回転輪と該固定輪との間に転動自在に配置される複数の転動体と、前記回転輪と前記固定輪の一方に装着され、且つ、他方の側に設けられた相手面と摺接するシールリップを有する密封装置と、を有する車輪用軸受ユニットであって、
前記シールリップと摺接する前記相手面は、前記シールリップの摺接位置より径方向外方部位が、前記摺接位置より軸方向外方に位置するように形成されることを特徴とする車輪用軸受ユニット。 A rotating wheel, a fixed wheel, a plurality of rolling elements disposed between the rotating wheel and the fixed wheel so as to be freely rollable, one of the rotating wheel and the fixed wheel, and the other side A wheel bearing unit having a sealing device having a sealing lip that is in sliding contact with a mating surface provided on the wheel,
For the wheel, the mating surface that is in sliding contact with the seal lip is formed such that a radially outer portion is positioned axially outward from the sliding contact position from the sliding contact position of the seal lip. Bearing unit.
JP2005214553A 2005-07-25 2005-07-25 Bearing unit for wheel Pending JP2007032640A (en)

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JP2007032640A5 JP2007032640A5 (en) 2008-05-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114352641A (en) * 2021-12-21 2022-04-15 浙江万向精工有限公司 Low-torque self-adjusting sealing assembly and hub bearing thereof
WO2022152319A1 (en) * 2021-01-18 2022-07-21 舍弗勒技术股份两合公司 Bearing and sealing device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62283261A (en) * 1986-05-29 1987-12-09 Uchiyama Mfg Corp Combined seal
JPH08178080A (en) * 1994-10-03 1996-07-12 Ford Motor Co Single axle seal for automobile
JP2000289405A (en) * 1999-04-02 2000-10-17 Nsk Ltd Combined seal ring with encoder
JP2002061660A (en) * 2000-08-23 2002-02-28 Nsk Ltd Rolling bearing unit for wheel
JP2002340921A (en) * 2001-05-14 2002-11-27 Ntn Corp Magnetic encoder and bearing for wheel provided with it

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62283261A (en) * 1986-05-29 1987-12-09 Uchiyama Mfg Corp Combined seal
JPH08178080A (en) * 1994-10-03 1996-07-12 Ford Motor Co Single axle seal for automobile
JP2000289405A (en) * 1999-04-02 2000-10-17 Nsk Ltd Combined seal ring with encoder
JP2002061660A (en) * 2000-08-23 2002-02-28 Nsk Ltd Rolling bearing unit for wheel
JP2002340921A (en) * 2001-05-14 2002-11-27 Ntn Corp Magnetic encoder and bearing for wheel provided with it

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022152319A1 (en) * 2021-01-18 2022-07-21 舍弗勒技术股份两合公司 Bearing and sealing device
CN114352641A (en) * 2021-12-21 2022-04-15 浙江万向精工有限公司 Low-torque self-adjusting sealing assembly and hub bearing thereof

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