JP2004176747A - Double row tapered roller bearing unit for supporting wheel - Google Patents

Double row tapered roller bearing unit for supporting wheel Download PDF

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Publication number
JP2004176747A
JP2004176747A JP2002340844A JP2002340844A JP2004176747A JP 2004176747 A JP2004176747 A JP 2004176747A JP 2002340844 A JP2002340844 A JP 2002340844A JP 2002340844 A JP2002340844 A JP 2002340844A JP 2004176747 A JP2004176747 A JP 2004176747A
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Japan
Prior art keywords
row
inner ring
double
ring
raceway
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Pending
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JP2002340844A
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Japanese (ja)
Inventor
Hisashi Otsuki
寿志 大槻
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP2002340844A priority Critical patent/JP2004176747A/en
Publication of JP2004176747A publication Critical patent/JP2004176747A/en
Pending legal-status Critical Current

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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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
    • F16C19/386—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/585—Details of specific parts of races of raceways, e.g. ribs to guide the rollers
    • 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
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/225—Details of the ribs supporting the end of the rollers
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/30—Angles, e.g. inclinations
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent various troubles from occurring, wherein since the inner side end part of a hub body is caulked to fix an inner ring, the large flange face of an inner row inner ring is tilted to an outer side by an axial load applied thereto by caulking and contact points between the large end faces and large flange faces of tapered rollers are shifted from a target point to the outer diameter side. <P>SOLUTION: The large flange angle Ai of the inner row inner ring is set smaller than that of the large flange angle Ao of an outer row inner ring beforehand so that the contact point thereof with the tapered rollers is not largely varied even if the large flange face 28a is tilted by the load of an axial force caused by a caulking operation. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、小型トラックや大型乗用車等、比較的重量が嵩む自動車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支持用複列円すいころ軸受ユニットの改良に関する。
【０００２】
【従来の技術】
自動車の車輪を懸架装置に対して回転自在に支持するのに、車輪支持用複列円すいころ軸受ユニットを使用する。この種の車輪支持用複列円すいころ軸受ユニットは、１個の複列外輪と２個の内輪とをもつ複列円すいころ軸受の形式が一般的であり、懸架装置を構成するナックル等に外輪を固定し、車輪を固定するためのハブに内輪を嵌合させる構造のものが知られている。ハブと嵌合した内輪を軸方向に固定するための手段として、ハブの軸端部を半径方向外方に塑性変形させてかしめることも知られている。
【０００３】
【特許文献１】
特開２００２−１６８２４６号公報（段落番号０００４、０００５、図１
、図２）
【０００４】
【発明が解決しようとする課題】
上に略述したような構成の車輪支持用複列円すいころ軸受ユニットは、その製造過程において、ハブ輪のインナー側端部をかしめて内輪を固定するため、インナー列の内輪大つば面はかしめによる軸方向荷重の負荷によりアウター側に倒れる。その結果、円すいころの大端面と大つば面との接触点が当初の狙いより外径側に移動して、回転トルクが大きくなる。さらに、円すいころが大つば外径の面取り部に接触すると、エッジロードや潤滑不良で焼付きにつながることがある。
【０００５】
本発明の目的は、上述の問題点を解消した車輪支持用複列円すいころ軸受ユニットを提供することにある。
【０００６】
【課題を解決するための手段】
本発明は、内周に複列の外輪軌道１０ａ，１０ｂを有する外輪１０と、外周に複列の内輪軌道２０ａ，２０ｂを有するハブ２０と、外輪軌道１０ａ，１０ｂと内輪軌道２０ａ，２０ｂとの間に転動自在に介在する複列の円すいころ３０とを備え、前記ハブ２０が、外周に車輪を固定するためのフランジ２４と支持段部２３を有するハブ本体２２と、ハブ本体２２の支持段部に嵌合した一対の内輪２６，２８とで構成され、各内輪２６，２８の外周面に前記内輪軌道２０ａ，２０ｂが形成され、前記内輪２６，２８が、支持段部２３の外端部に存在する段差面２９と、ハブ本体２２の内端部に設けた円筒部２５を半径方向外方に塑性変形させることによって形成したかしめ部２７との間に固定された、車輪支持用複列円すいころ軸受ユニットにおいて、前記塑性変形の前の状態において、インナー列内輪２８の大つば角度（Ａｉ）をアウター列内輪２６の大つば角度（Ａｏ）よりも小さく設定（Ａｉ＜Ａｏ）してあることを特徴とするものである。
【０００７】
また、本発明は、内周に複列の外輪軌道１０ａ，１０ｂを有する外輪１０と、外周に複列の内輪軌道２０ａ，２０ｂを有するハブ２０´と、外輪軌道１０ａ，１０ｂと内輪軌道２０ａ，２０ｂとの間に転動自在に介在する複列の円すいころ３０とを備え、前記ハブ２０´が、外周に車輪を固定するためのフランジ２４とアウター列内輪軌道２０ａと支持段部２３´を有するハブ本体２２´と、ハブ本体２２´の支持段部に嵌合し外周面にインナー列内輪軌道２０ｂを形成した内輪２８とで構成され、前記内輪２８が、支持段部２３´の外端部に存在する段差面２９´と、ハブ本体２２´の内端部に設けた円筒部２５を半径方向外方に塑性変形させることによって形成したかしめ部２７との間に固定された、車輪支持用複列円すいころ軸受ユニットにおいて、前記塑性変形の前の状態において、インナー列内輪２８の大つば角度（Ａｉ）をアウター列内輪２６の大つば角度（Ａｏ）よりも小さく設定（Ａｉ＜Ａｏ）してあることを特徴とするものである。
【０００８】
本発明によれば、ハブ本体２２，２２´の円筒部２５を半径方向外方に塑性変形させてかしめ部２７を形成するのに伴って別体の内輪２８の大つば面がアウター側に倒れた場合でも、それを見越して予め、インナー列内輪２８の大つば角度（Ａｉ）をアウター列内輪２６の大つば角度（Ａｏ）よりも小さく設定（Ａｉ＜Ａｏ）してあるため、円すいころ３０と大つば面との接触点が所期の狙い点から大きくはずれることがない。
【０００９】
【発明の実施の形態】
以下、図面に従って本発明の実施の形態を説明する。まず、図２および図３に従って車輪支持用複列円すいころ軸受ユニットの基本構成を説明した後、図１に従って本発明の実施の形態を説明することとする。
【００１０】
図２に示すように、車輪支持用複列円すいころ軸受ユニットは、外輪１０と、ハブ２０と、複数個の円すいころ３０を備える。外輪１０は、内周面にそれぞれが円すい凹面状であるアウター列外輪軌道１０ａおよびインナー列外輪軌道１０ｂを形成し、外周に懸架装置に固定するための取付け部１２を形成している。ここで、複列軌道のうち、自動車に組み付けた状態で外側となる方をアウター列、内側となる方をインナー列と呼ぶこととする。同様に、「内」、「外」というときは、自動車に組み付けた状態の車両の幅方向で見た内側、外側を意味するものとする。
【００１１】
外輪１０の内径側に、外輪１０と同心にハブ２０が位置している。ハブ２０は、ハブ本体２２と一対の内輪２６，２８とで構成されている。ハブ本体２２は、外周の外端部に車輪を固定するためのフランジ２４を形成している。また、ハブ本体２２の外周面の中間部から内端部に至る部分に、支持段部２３を形成している。この支持段部２３に一対の内輪２６，２８をしまりばめにより圧入している。外側の内輪２６は外周面にアウター列内輪軌道２０ａを形成している。内側の内輪２８は外周面にインナー列内輪軌道２０ｂを形成している。そして、外輪軌道１０ａ，１０ｂと内輪軌道２０ａ，２０ｂとの間に、複数個の円すいころ３０を、それぞれ合成樹脂製あるいは金属製の保持器３２により転動自在に保持した状態で設けている。
【００１２】
ハブ本体２２の内端部に設けた円筒部２５を半径方向外方に塑性変形させることにより形成したかしめ部２７により第二の内輪２８の内端面を押さえつけ、一対の内輪２６，２８をかしめ部２７と支持段部２３の外端部に存在する段差面２９との間で挟持することにより、一対の内輪２６，２８をハブ本体２２に固定している。また、内輪２８の内端面をかしめ部２７により押さえつけることにより、円すいころ３０と各軌道１０ａ，１０ｂ，２０ａ，２０ｂとで構成される軸受部に予圧が付与される。
【００１３】
本発明の対象となる車輪支持用複列円すいころ軸受ユニットには、図３に示すように、ハブ２０´を構成するハブ本体２２´の中間部外周面に直接内輪軌道２０ａを形成した構造のものも含まれる。この場合には、このハブ本体２２´の外周面の内端部にのみ、１個の内輪２８を圧入するための支持段部２３´を設け、支持段部２３´の外端部に存在する段差面２９´に内輪２８の外端面を当接させる。
【００１４】
さらに、外輪１０の両端部内周面にはシールリング（組み合わせシールリング）１４，１６を設けて、円すいころ３０を含む軸受空間３４の両端開口部を塞いでいる。なお、図示例は駆動輪支持用の複列円すいころ軸受ユニットであることから、ハブ本体２２，２２´の中心部にスプライン孔２１を設けている。
【００１５】
上述の構成の車輪支持用複列円すいころ軸受ユニットを自動車に組み付ける際には、外輪１０の取付け部１２を懸架装置を構成するナックル等に固定するとともに、フランジ２４に車輪を固定する。これにより、車輪が懸架装置に対して回転自在に支持された状態となる。そして、ハブ本体２２のスプライン孔２１に、図示しない等速自在継手に付属のスプライン軸を挿入して固定することにより、ハブ本体２２を介して車輪にトルクを伝達できるようになる。
【００１６】
続いて、図１に示す実施の形態について説明する。図１（ａ）は図２、図３におけるＡ部の拡大図であって、アウター列内輪軌道２０ａの大つば形状を示す。同様に、図１（ｂ）は図２、図３におけるＢ部の拡大図であって、インナー列内輪２８の大つば形状を示す。図中、アウター列内輪軌道２０ａの大つば面およびインナー列内輪軌道２０ｂの大つば面をそれぞれ符号２６ａ，２８ａで指してある。なお、図２および図３が組立後の軸受を示しているのに対し、図１は組立前、つまり、かしめ部２７の塑性変形前の状態を示している。
【００１７】
図１から理解できるとおり、インナー列内輪２８の大つば角度Ａｉをアウター列内輪２６の大つば角度Ａｏよりも小さく設定してある。かしめ部２７の形成作業に伴って、インナー列内輪２８の大つば面２８ａは、図１（ｂ）に二点鎖線で示すように、大つば角度Ａｉが大きくなる方向に倒れる。大つば角度Ａｉは、したがって、大つば面２８ａが倒れても大つば外径の面取り部に円すいころ３０が接触しないような値に設定する必要がある。Ａｏ−Ａｉの値を例示するならば、０°５′〜０°１０′程度である。
【００１８】
上述の構成の車輪支持用複列円すいころ軸受ユニットによれば、ハブ本体２２の内端部に設けた円筒部２５を半径方向外方に塑性変形させてかしめ部２７（図２〜３参照）を形成するのに伴って、インナー列内輪２８の大つば面２８ａが倒れた場合でも（図１（ｂ）参照）、インナー列内輪２８の大つば面２８ａと円すいころ３０大端面との接触位置が所期の狙い点から大きく外れることがない。
【００１９】
【発明の効果】
本発明によれば、ハブ本体２２，２２´の円筒部２５を半径方向外方に塑性変形させてかしめ部２７を形成するのに伴って別体の内輪２８の大つば面２８ａがアウター側に倒れた場合でも、それを見越して予め、インナー列内輪２８の大つば角度Ａｉをアウター列内輪２６の大つば角度Ａｏよりも小さく設定（Ａｉ＜Ａｏ）してあるため、円すいころ３０の大端面と大つば面２８ａとの接触点が所期の狙い点から大きくはずれることがない。したがって、円すいころ３０の大端面は大つば面取り部に接触することがなく、エッジロードが発生しにくく、潤滑不良や焼付きの生じにくい、すぐれた耐久性を有する車輪支持用複列円すいころ軸受ユニットを提供することができる。
【図面の簡単な説明】
【図１】（ａ）は本発明の実施の形態を示すアウター列内輪軌道の部分断面図、（ｂ）は本発明の実施の形態を示すインナー列内輪軌道の部分断面図である。
【図２】車輪支持用複列円すいころ軸受ユニットの断面図である。
【図３】別の車輪支持用複列円すいころ軸受ユニットの断面図である。
【符号の説明】
１０ 外輪
１０ａ アウター列外輪軌道
１０ｂ インナー列外輪軌道
１２ 取付け部
１４ シールリング
１６ シールリング
２０，２０´ ハブ
２０ａ アウター列内輪軌道
２０ｂ インナー列内輪軌道
２１ スプライン孔
２２，２２´ ハブ本体
２３，２３´ 支持段部
２４ フランジ
２５ 円筒部
２６ 内輪（アウター列）
２６ａ 大つば面
Ａｏ 大つば角度
２７ かしめ部
２８ 内輪（インナー列）
２８ａ 大つば面
Ａｉ 大つば角度
２９，２９´ 段差面
３０ 円すいころ
３２ 保持器
３４ 空間[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement of a double row tapered roller bearing unit for supporting wheels for rotatably supporting wheels of a relatively heavy automobile such as a light truck or a large passenger car with respect to a suspension device.
[0002]
[Prior art]
A double-row tapered roller bearing unit for supporting wheels is used to rotatably support the wheels of an automobile with respect to a suspension device. This type of double-row tapered roller bearing unit for supporting wheels is generally a double-row tapered roller bearing having one double-row outer ring and two inner rings, and is used for a knuckle or the like constituting a suspension device. And a structure in which an inner ring is fitted to a hub for fixing wheels is known. As means for fixing the inner ring fitted to the hub in the axial direction, it is also known that the shaft end of the hub is plastically deformed outward in the radial direction and caulked.
[0003]
[Patent Document 1]
JP-A-2002-168246 (paragraphs 0004 and 0005, FIG.
, Figure 2)
[0004]
[Problems to be solved by the invention]
The double-row tapered roller bearing unit for wheel support having the structure outlined above is used to caulk the inner end of the hub wheel and fix the inner ring in the manufacturing process. Falls to the outer side due to the axial load. As a result, the point of contact between the large end face of the tapered roller and the large brim face moves to the outer diameter side from the initial target, and the rotational torque increases. Further, when the tapered rollers come into contact with the chamfered portion having the outer diameter of the large brim, seizure may be caused due to edge load or poor lubrication.
[0005]
An object of the present invention is to provide a double-row tapered roller bearing unit for wheel support that has solved the above-mentioned problems.
[0006]
[Means for Solving the Problems]
The present invention relates to an outer ring 10 having a double-row outer raceway 10a, 10b on the inner circumference, a hub 20 having a double-row inner raceway 20a, 20b on the outer circumference, an outer raceway 10a, 10b and an inner raceway 20a, 20b. A hub body 22 having a plurality of rows of tapered rollers 30 rotatably interposed therebetween, wherein the hub 20 has a flange 24 and a supporting step portion 23 for fixing wheels on the outer periphery; The inner races 20a, 20b are formed on the outer peripheral surface of each of the inner races 26, 28, and the inner races 26, 28 are formed on the outer ends of the support step 23. The wheel supporting member fixed between a step surface 29 existing in the portion and a caulking portion 27 formed by plastically deforming a cylindrical portion 25 provided at the inner end of the hub body 22 outward in the radial direction. For row tapered roller bearing units Further, in the state before the plastic deformation, the large brim angle (Ai) of the inner row inner race 28 is set smaller than the large brim angle (Ao) of the outer row inner race 26 (Ai <Ao). Is what you do.
[0007]
The present invention also provides an outer ring 10 having multiple rows of outer raceways 10a, 10b on the inner circumference, a hub 20 'having a double row of inner raceways 20a, 20b on the outer circumference, outer raceways 10a, 10b and inner raceway 20a, 20b, the hub 20 'is provided with a flange 24 for fixing wheels on the outer periphery, an outer row inner raceway 20a, and a supporting step 23'. A hub body 22 'having an inner race 28 which is fitted to a supporting step of the hub body 22' and has an inner row inner ring raceway 20b formed on an outer peripheral surface thereof. The inner ring 28 is an outer end of the supporting step 23 '. Wheel support fixed between a step surface 29 ′ present in the portion and a caulking portion 27 formed by plastically deforming a cylindrical portion 25 provided at the inner end of the hub body 22 ′ outward in the radial direction. Double row tapered roller bearing unit In the state before the plastic deformation, the large brim angle (Ai) of the inner row inner ring 28 is set smaller than the large brim angle (Ao) of the outer row inner ring 26 (Ai <Ao). It is assumed that.
[0008]
According to the present invention, as the cylindrical portion 25 of the hub bodies 22, 22 'is plastically deformed radially outward to form the caulked portion 27, the large flange surface of the separate inner ring 28 falls to the outer side. In this case, since the large brim angle (Ai) of the inner row inner ring 28 is previously set to be smaller than the large brim angle (Ao) of the outer row inner ring 26 (Ai <Ao), the tapered rollers 30 are anticipated. The point of contact with the large brim does not deviate significantly from the intended target.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the basic configuration of a double row tapered roller bearing unit for supporting wheels will be described with reference to FIGS. 2 and 3, and then the embodiment of the present invention will be described with reference to FIG.
[0010]
As shown in FIG. 2, the double-row tapered roller bearing unit for supporting wheels includes an outer ring 10, a hub 20, and a plurality of tapered rollers 30. The outer race 10 has an outer row of outer races 10a and an inner row of outer races 10b each having a conical concave shape formed on an inner circumferential surface, and a mounting portion 12 for fixing to a suspension device on the outer circumference. Here, of the double-row tracks, the outer row when assembled to the vehicle is called an outer row, and the inner row is called an inner row. Similarly, “inside” and “outside” mean inside and outside as viewed in the width direction of the vehicle assembled to the vehicle.
[0011]
The hub 20 is located concentrically with the outer ring 10 on the inner diameter side of the outer ring 10. The hub 20 includes a hub body 22 and a pair of inner rings 26 and 28. The hub body 22 has a flange 24 at the outer end of the outer periphery for fixing the wheel. Further, a support step 23 is formed in a portion from an intermediate portion of the outer peripheral surface of the hub body 22 to an inner end portion. A pair of inner rings 26 and 28 are press-fitted into the support step 23 by interference fitting. The outer inner ring 26 forms an outer row inner ring track 20a on the outer peripheral surface. The inner inner ring 28 forms an inner row inner ring track 20b on the outer peripheral surface. A plurality of tapered rollers 30 are provided between the outer raceways 10a and 10b and the inner raceways 20a and 20b in such a manner as to be freely rolled by retainers 32 made of synthetic resin or metal.
[0012]
The inner end surface of the second inner ring 28 is pressed by a caulking portion 27 formed by plastically deforming a cylindrical portion 25 provided at the inner end portion of the hub body 22 radially outward, and the pair of inner rings 26, 28 are caulked. The pair of inner rings 26 and 28 are fixed to the hub main body 22 by being sandwiched between the support step 27 and a step surface 29 existing at the outer end of the support step 23. Further, by pressing the inner end surface of the inner ring 28 by the caulking portion 27, a preload is applied to the bearing portion constituted by the tapered rollers 30 and the tracks 10a, 10b, 20a, 20b.
[0013]
As shown in FIG. 3, the double row tapered roller bearing unit for supporting a wheel according to the present invention has a structure in which an inner raceway 20a is formed directly on an outer peripheral surface of an intermediate portion of a hub body 22 'constituting a hub 20'. Things are also included. In this case, a support step 23 'for press-fitting one inner ring 28 is provided only at the inner end of the outer peripheral surface of the hub main body 22', and the support step 23 'exists at the outer end of the support step 23'. The outer end surface of the inner ring 28 is brought into contact with the step surface 29 '.
[0014]
Further, seal rings (combined seal rings) 14 and 16 are provided on the inner peripheral surfaces of both ends of the outer ring 10 to close the openings at both ends of the bearing space 34 including the tapered rollers 30. Since the illustrated example is a double-row tapered roller bearing unit for driving wheel support, a spline hole 21 is provided in the center of the hub bodies 22, 22 '.
[0015]
When assembling the double row tapered roller bearing unit for wheel support having the above-described configuration to an automobile, the mounting portion 12 of the outer ring 10 is fixed to a knuckle or the like constituting a suspension device, and the wheel is fixed to the flange 24. As a result, the wheels are rotatably supported by the suspension device. Then, by inserting and fixing a spline shaft attached to a constant velocity universal joint (not shown) into the spline hole 21 of the hub body 22, torque can be transmitted to the wheels via the hub body 22.
[0016]
Subsequently, the embodiment shown in FIG. 1 will be described. FIG. 1A is an enlarged view of a portion A in FIGS. 2 and 3 and shows a large brim shape of an outer row inner ring raceway 20a. Similarly, FIG. 1B is an enlarged view of a portion B in FIGS. 2 and 3 and shows a large brim shape of the inner row inner ring 28. In the figure, the large brim surface of the outer row inner raceway 20a and the large brim surface of the inner row inner raceway 20b are indicated by reference numerals 26a and 28a, respectively. 2 and 3 show the bearing after assembly, while FIG. 1 shows a state before assembly, that is, a state before the plastic deformation of the swaged portion 27.
[0017]
As can be understood from FIG. 1, the large brim angle Ai of the inner row inner race 28 is set smaller than the large brim angle Ao of the outer row inner race 26. As the caulking portion 27 is formed, the large brim surface 28a of the inner row inner ring 28 falls down in the direction in which the large brim angle Ai increases, as shown by the two-dot chain line in FIG. Therefore, the large brim angle Ai needs to be set to a value such that the tapered roller 30 does not come into contact with the chamfered portion of the large brim outside diameter even if the large brim surface 28a falls down. For example, the value of Ao-Ai is about 0 ° 5 ′ to 0 ° 10 ′.
[0018]
According to the double row tapered roller bearing unit for wheel support having the above-described configuration, the cylindrical portion 25 provided at the inner end portion of the hub body 22 is plastically deformed radially outward to form the caulking portion 27 (see FIGS. 2 to 3). When the large brim surface 28a of the inner row inner ring 28 falls down (see FIG. 1B), the contact position between the large brim face 28a of the inner row inner ring 28 and the large end face of the tapered roller 30 is formed. Is not far from the intended target.
[0019]
【The invention's effect】
According to the present invention, the cylindrical portion 25 of the hub bodies 22, 22 'is plastically deformed radially outward to form the caulked portion 27, so that the large brim surface 28a of the separate inner ring 28 faces the outer side. Even if it falls down, the large end angle Ai of the inner row inner ring 28 is previously set smaller (Ai <Ao) than the large brim angle Ao of the outer row inner ring 26 in anticipation of this, so that the large end face of the tapered roller 30 is set. The contact point between the contact point and the large brim surface 28a does not largely deviate from the intended target point. Therefore, the large end face of the tapered roller 30 does not come into contact with the chamfered portion of the large brim, the edge load is hardly generated, the lubrication failure and seizure are hardly generated, and the double row tapered roller bearing for wheel supporting has excellent durability. Units can be provided.
[Brief description of the drawings]
FIG. 1A is a partial sectional view of an outer row inner raceway showing an embodiment of the present invention, and FIG. 1B is a partial sectional view of an inner row inner raceway showing an embodiment of the present invention.
FIG. 2 is a sectional view of a double-row tapered roller bearing unit for supporting wheels.
FIG. 3 is a cross-sectional view of another wheel supporting double row tapered roller bearing unit.
[Explanation of symbols]
Reference Signs List 10 outer ring 10a outer row outer ring track 10b inner row outer ring track 12 mounting portion 14 seal ring 16 seal ring 20, 20 'hub 20a outer row inner ring track 20b inner row inner ring track 21 spline holes 22, 22' hub bodies 23, 23 'support Step portion 24 Flange 25 Cylindrical portion 26 Inner ring (outer row)
26a Large collar face Ao Large collar angle 27 Caulking part 28 Inner ring (inner row)
28a Large collar face Ai Large collar angle 29, 29 'Step surface 30 Tapered roller 32 Cage 34 Space

Claims (2)

内周に複列の外輪軌道を有する外輪と、
外周に複列の内輪軌道を有するハブと、
外輪軌道と内輪軌道との間に転動自在に介在する複列の円すいころとを備え、
前記ハブが、外周に車輪を固定するためのフランジと支持段部を有するハブ本体と、ハブ本体の支持段部に嵌合した一対の内輪とで構成され、各内輪の外周面に前記内輪軌道が形成され、前記内輪が、支持段部の外端部に存在する段差面と、ハブ本体の内端部に設けた円筒部を半径方向外方に塑性変形させることによって形成したかしめ部との間に固定された、車輪支持用複列円すいころ軸受ユニットにおいて、
前記塑性変形の前の状態において、インナー列内輪の大つば角度をアウター列内輪の大つば角度よりも小さく設定してあることを特徴とする車輪支持用複列円すいころ軸受ユニット。An outer ring having a double-row outer ring track on the inner periphery,
A hub having a double row of inner ring raceways on the outer periphery,
Equipped with double-row tapered rollers that are rotatably interposed between the outer raceway and the inner raceway,
The hub is composed of a hub body having a flange and a supporting step for fixing a wheel on the outer periphery, and a pair of inner rings fitted to the supporting step of the hub body, wherein the inner ring raceway is provided on the outer peripheral surface of each inner ring. Is formed, and the inner ring is formed by a step surface present at an outer end portion of the supporting step portion and a caulking portion formed by plastically deforming a cylindrical portion provided at the inner end portion of the hub body radially outward. In the double row tapered roller bearing unit for wheel support fixed between,
A double-row tapered roller bearing unit for supporting wheels, wherein the large brim angle of the inner row inner ring is set smaller than the large brim angle of the outer row inner ring in a state before the plastic deformation. 内周に複列の外輪軌道を有する外輪と、
外周に複列の内輪軌道を有するハブと、
外輪軌道と内輪軌道との間に転動自在に介在する複列の円すいころとを備え、
前記ハブが、外周に車輪を固定するためのフランジとアウター列内輪軌道と支持段部を有するハブ本体と、ハブ本体の支持段部に嵌合し外周面にインナー列内輪軌道を形成した内輪とで構成され、前記内輪が、支持段部の外端部に存在する段差面と、ハブ本体の内端部に設けた円筒部を半径方向外方に塑性変形させることによって形成したかしめ部との間に固定された、車輪支持用複列円すいころ軸受ユニットにおいて、
前記塑性変形の前の状態において、インナー列内輪の大つば角度をアウター列内輪の大つば角度よりも小さく設定してある車輪支持用複列円すいころ軸受ユニット。An outer ring having a double-row outer ring track on the inner periphery,
A hub having a double row of inner ring raceways on the outer periphery,
Equipped with double-row tapered rollers that are rotatably interposed between the outer raceway and the inner raceway,
A hub body having a flange, an outer row inner ring raceway, and a support step portion for fixing the wheel to the outer periphery, and an inner ring having an inner row inner ring raceway formed on the outer peripheral surface by fitting to the support step portion of the hub body. The inner ring, a step surface present at the outer end of the supporting step, and a caulking portion formed by plastically deforming a cylindrical portion provided at the inner end of the hub body radially outward. In the double row tapered roller bearing unit for wheel support fixed between,
A double row tapered roller bearing unit for supporting wheels, wherein the large collar angle of the inner row inner ring is set smaller than the large collar angle of the outer row inner ring before the plastic deformation.
JP2002340844A 2002-11-25 2002-11-25 Double row tapered roller bearing unit for supporting wheel Pending JP2004176747A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002340844A JP2004176747A (en) 2002-11-25 2002-11-25 Double row tapered roller bearing unit for supporting wheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002340844A JP2004176747A (en) 2002-11-25 2002-11-25 Double row tapered roller bearing unit for supporting wheel

Publications (1)

Publication Number Publication Date
JP2004176747A true JP2004176747A (en) 2004-06-24

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ID=32703363

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011163454A (en) * 2010-02-10 2011-08-25 Ntn Corp Bearing device for wheel
WO2018168964A1 (en) * 2017-03-16 2018-09-20 Ntn株式会社 Bearing device for vehicle wheel
CN111133210A (en) * 2017-09-28 2020-05-08 Ntn株式会社 Retainer for tapered roller bearing and tapered roller bearing

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011163454A (en) * 2010-02-10 2011-08-25 Ntn Corp Bearing device for wheel
WO2018168964A1 (en) * 2017-03-16 2018-09-20 Ntn株式会社 Bearing device for vehicle wheel
JP2018155304A (en) * 2017-03-16 2018-10-04 Ntn株式会社 Bearing device for wheel
US10767689B2 (en) 2017-03-16 2020-09-08 Ntn Corporation Bearing device for vehicle wheel
CN111133210A (en) * 2017-09-28 2020-05-08 Ntn株式会社 Retainer for tapered roller bearing and tapered roller bearing
CN111133210B (en) * 2017-09-28 2022-01-04 Ntn株式会社 Retainer for tapered roller bearing and tapered roller bearing

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