JP2002168246A - Double-row cone roller bearing unit for holding wheel - Google Patents

Double-row cone roller bearing unit for holding wheel

Info

Publication number
JP2002168246A
JP2002168246A JP2000359910A JP2000359910A JP2002168246A JP 2002168246 A JP2002168246 A JP 2002168246A JP 2000359910 A JP2000359910 A JP 2000359910A JP 2000359910 A JP2000359910 A JP 2000359910A JP 2002168246 A JP2002168246 A JP 2002168246A
Authority
JP
Japan
Prior art keywords
raceway
peripheral surface
ring
outer peripheral
crowning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000359910A
Other languages
Japanese (ja)
Inventor
Hideshi Shibuya
英志 渋谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NSK Ltd filed Critical NSK Ltd
Priority to JP2000359910A priority Critical patent/JP2002168246A/en
Publication of JP2002168246A publication Critical patent/JP2002168246A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0078—Hubs characterised by the fixation of bearings
    • B60B27/0084—Hubs characterised by the fixation of bearings caulking to fix inner race
    • 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
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/50—Crowning, e.g. crowning height or crowning radius
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To prevent an edge load to be applied on a second inner-ring raceway 9 by making crowning conducted to the second inner-ring raceway 9 appropriate notwithstanding an elastic deformation of a second inner ring 13 that occurs associated with the formation of a caulking section 16. SOLUTION: The drop amount of the crowning conducted to the second inner-ring raceway 9 is made small at the external edge and large at the internal edge. The problem is solved thereby, since the drop amount at the internal edge is made appropriate in conjunction with the elastic deformation.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[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為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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a double row tapered roller bearing unit for supporting wheels of a relatively heavy vehicle such as a small truck or a large passenger car so as to be rotatable with respect to a suspension device. About.

【０００２】[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。図１は、この様な目的で先に考えた車
輪支持用複列円すいころ軸受ユニットの第１例を示して
いる。この車輪支持用複列円すいころ軸受ユニットは、
外輪１と、ハブ２と、複数個の円すいころ３、３とを備
える。このうちの外輪１は、内周面にそれぞれが円すい
凹面状である第一、第二の外輪軌道４、５を、外周面に
懸架装置に固定する為の取付部６を、それぞれ設けてい
る。又、上記ハブ２は、上記外輪１の内径側に、この外
輪１と同心に配置している。2. Description of the Related Art Double row tapered roller bearing units for supporting wheels are used to rotatably support the wheels of a vehicle with respect to a suspension system. FIG. 1 shows a first example of a double-row tapered roller bearing unit for supporting a wheel, which was previously considered for such a purpose. This double row tapered roller bearing unit for wheel support
The vehicle includes an outer race 1, a hub 2, and a plurality of tapered rollers 3,3. The outer ring 1 of this first respectively on the inner peripheral surface is a conical concave, a second outer ring raceway 4 and 5, a mounting portion 6 for fixing to the suspension device on the outer peripheral surface are provided respectively . The hub 2 is arranged on the inner diameter side of the outer ring 1 and concentrically with the outer ring 1.

【０００３】この様なハブ２は、外周面の外端部（外と
は、自動車への組み付け状態で車両の幅方向外寄りとな
る側で、各図の左側）に車輪を支持固定する為のフラン
ジ７を形成すると共に、外周面の中間部に第一の内輪軌
道８を、同じく内端部（内とは、自動車への組み付け状
態で車両の幅方向中央寄りとなる側で、各図の右側）に
第二の内輪軌道９を、それぞれ設けている。そして、こ
れら第一、第二の内輪軌道８、９と上記第一、第二の外
輪軌道４、５との間に、それぞれ複数個ずつの円すいこ
ろ３、３を、それぞれ合成樹脂製或は金属製の保持器１
０、１０により転動自在に保持した状態で設けている。Such a hub 2 is used to support and fix wheels at the outer end portion of the outer peripheral surface (the outer side is a side which is closer to the outside in the width direction of the vehicle when assembled to the vehicle, left side in each drawing). And a first inner raceway 8 at an intermediate portion of an outer peripheral surface, and an inner end portion (inner means a side closer to the center in the width direction of the vehicle when assembled to the vehicle, and (The right side of the right side of FIG. 2). A plurality of tapered rollers 3 are respectively provided between the first and second inner raceways 8 and 9 and the first and second outer raceways 4 and 5 by synthetic resin or Metal cage 1
It is provided in a state of being rollably held by 0,10.

【０００４】又、上記ハブ２は、ハブ本体１１と第一、
第二の内輪１２、１３とを組み合わせて成り、このうち
の第一の内輪１２の外周面に上記第一の内輪軌道８を、
第二の内輪１３の外周面に上記第二の内輪軌道９を、そ
れぞれ形成している。この様にハブ本体１１と第一、第
二の内輪１２、１３とを組み合わせる為、このハブ本体
１１の外周面の中間部から内端部に至る部分に、支持段
部１４を形成している。そして、この支持段部１４に上
記第一、第二の内輪１２、１３を、締り嵌めにより外嵌
（圧入）している。更に、上記ハブ本体１１の内端部に
設けた円筒部１５を径方向外方に塑性変形する事により
形成したかしめ部１６により上記第二の内輪１３の内端
面を抑え付け、上記第一、第二の内輪１２、１３を上記
かしめ部１６と上記支持円筒部１４の外端部に存在する
段差面１７との間で挟持する事により、上記第一、第二
の内輪１２、１３を上記ハブ本体１１に固定している。
又、この様に第二の内輪１３の内端面を上記かしめ部１
６により抑え付けた状態で、上記各円すいころ３、３と
上記各軌道４、５、８、９とを含んで構成する軸受部に
予圧を付与している。[0004] The hub 2 is connected to the hub main body 11 firstly.
The second inner races 12 and 13 are combined, and the first inner raceway 8 is formed on the outer peripheral surface of the first inner race 12,
The second inner raceway 9 is formed on the outer peripheral surface of the second inner race 13. In order to combine the hub main body 11 with the first and second inner rings 12 and 13 in this manner, a support step 14 is formed in a portion from the middle portion to the inner end of the outer peripheral surface of the hub main body 11. . The first and second inner rings 12 and 13 are fitted (press-fitted) to the support step portion 14 by interference fitting. Further, the inner end surface of the second inner ring 13 is suppressed by a caulking portion 16 formed by plastically deforming a cylindrical portion 15 provided at an inner end portion of the hub body 11 radially outward. By clamping the second inner rings 12, 13 between the caulking portion 16 and the stepped surface 17 present at the outer end of the support cylindrical portion 14, the first and second inner rings 12, 13 are held. It is fixed to the hub body 11.
Also, the inner end surface of the second inner ring 13 is fixed to the caulking portion 1 as described above.
In a state where the bearing is held down by 6, the preload is applied to the bearing portion including the tapered rollers 3, 3 and the tracks 4, 5, 8, 9, respectively.

【０００５】尚、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２に示した様に、ハブ２
ａを構成するハブ本体１１ａの中間部外周面に直接内輪
軌道８ａを形成する構造のものもある。この場合には、
このハブ本体１１ａの外周面の内端部にのみ、１個の内
輪２３を外嵌固定する為の支持段部２４を設け、この内
輪２３の外端面を当接させる為の段差面１７ａは、上記
ハブ本体１１ａ自体に設ける。これに対して、図１に示
した様に、第一、第二の内輪１２、１３を設ける場合に
は、このうちの第一の内輪１２の内端面が、請求項に記
載した段差面となる。The double-row tapered roller bearing unit for supporting a wheel, which is the object of the present invention, has a hub 2 as shown in FIG.
There is also a structure in which the inner raceway 8a is formed directly on the outer peripheral surface of the intermediate portion of the hub main body 11a constituting the a. In this case,
Only at the inner end of the outer peripheral surface of the hub main body 11a is provided a support step portion 24 for externally fitting and fixing one inner ring 23, and a step surface 17a for making the outer end surface of the inner ring 23 abut, It is provided on the hub body 11a itself. On the other hand, as shown in FIG. 1, when the first and second inner rings 12 and 13 are provided, the inner end face of the first inner ring 12 is the same as the step surface described in the claims. Become.

【０００６】何れにしても、上記第一、第二の内輪軌道
８、９には、それぞれ図３に誇張して示す様なクラウニ
ングを施して（第一、第二の外輪軌道４、５も同様）、
これら両内輪軌道８、９と上記各円すいころ３、３の転
動面との当接部に、エッジロードが加わる事を防止して
いる。上記図３に示した、従来から標準的に行なわれて
いたクラウニングの断面形状は、軸方向に関する中間部
２１を大きな曲率半径Ｒを有する凸円弧とし、軸方向に
関する両端部２２、２２を小さな曲率半径ｒを有する凸
円弧としている。これら両部２１、２２の曲率半径Ｒ、
ｒの曲率中心は、何れも、上記第一、第二の内輪軌道
８、９の軸方向中心でこれら両軌道８、９と直交する直
線である、中心線α上に位置させている。In any case, the first and second inner raceways 8 and 9 are crowned as shown in FIG. 3 (the first and second outer raceways 4 and 5 are also exaggerated). Same),
Edge load is prevented from being applied to the contact portions between the inner raceways 8, 9 and the rolling surfaces of the tapered rollers 3, 3. As shown in FIG. 3, the conventional cross-sectional shape of the crowning is such that the intermediate portion 21 in the axial direction is a convex arc having a large radius of curvature R, and both ends 22, 22 in the axial direction are small in curvature. It is a convex arc having a radius r. The radii of curvature R of these two parts 21, 22 are:
The center of curvature of r is located on a center line α, which is a straight line orthogonal to the first and second inner raceways 8, 9 at the axial center of the two raceways 8, 9.

【０００７】即ち、上記曲率中心が存在する上記中心線
αから上記中間部２１の軸方向両端縁までの距離ｘ0 、
ｘ0 同士、並びにこの中心線αから上記両端部２２、２
２の端縁までの距離ｙ0 、ｙ0 同士を互いに等しくして
いる。従って、上記中間部２１及び両端部２２、２２の
落ち量（上記中心線αに直交する、上記第一、第二の内
輪軌道８、９の接線に対して、当該部分が径方向内方に
変位している長さ寸法）δ0 、δ1 は、これら第一、第
二の内輪軌道８、９の両端部で互いに一致している。That is, a distance x 0 from the center line α where the center of curvature is present to both axial edges of the intermediate portion 21,
x 0 , and from both ends 22, 2
The distances y 0 , y 0 to the edge of No. 2 are equal to each other. Therefore, the drop amount of the intermediate portion 21 and both end portions 22 and 22 (the portion is radially inward with respect to the tangent line of the first and second inner ring raceways 8 and 9 orthogonal to the center line α). The displaced length dimensions δ 0 and δ 1 coincide with each other at both ends of the first and second inner raceways 8 and 9.

【０００８】又、図示の例では、駆動輪支持用の複列円
すいころ軸受ユニットを構成すべく、上記ハブ本体１１
の中心部にスプライン孔１８を設けている。更に、前記
外輪１の両端部内周面と上記第一、第二の内輪１２、１
３との間にはシールリング（組み合わせシールリング）
１９、１９を設けて、上記各円すいころ３、３を設けた
空間２０の両端開口部を塞いでいる。尚、図２に示した
第２例の場合には、外輪１の外端部とハブ２ａの中間部
との間を塞ぐシールリング１９ａは、この外輪１の外端
部に外嵌している。この様に構成する車輪支持用複列円
すいころ軸受ユニットを自動車に組み付ける際には、前
記取付部６を懸架装置を構成するナックル等に結合固定
する共に、前記フランジ７に車輪を支持固定する。これ
により、この車輪が、懸架装置に対して回転自在に支持
された状態となる。又、上記スプライン孔１８に、図示
しない等速ジョイントに付属のスプライン軸を挿入し、
上記ハブ本体１１を介して上記車輪を回転駆動自在とす
る。Further, in the illustrated example, the hub body 11 is formed so as to constitute a double row tapered roller bearing unit for supporting driving wheels.
Is provided with a spline hole 18 at the center. Further, the inner peripheral surfaces of both ends of the outer ring 1 and the first and second inner rings
Seal ring between 3 and (combination seal ring)
19 and 19 are provided to close the openings at both ends of the space 20 in which the tapered rollers 3 and 3 are provided. In the case of the second example shown in FIG. 2, the seal ring 19 a that seals between the outer end of the outer race 1 and the intermediate part of the hub 2 a is fitted around the outer end of the outer race 1. . When assembling the double row tapered roller bearing unit for supporting wheels configured as described above to an automobile, the mounting portion 6 is connected and fixed to a knuckle or the like constituting a suspension device, and the wheels are supported and fixed to the flange 7. As a result, the wheels are rotatably supported by the suspension device. In addition, a spline shaft attached to a constant velocity joint (not shown) is inserted into the spline hole 18,
The wheels are rotatably driven via the hub body 11.

【０００９】[0009]

【発明が解決しようとする課題】上述した様な車輪支持
用複列円すいころ軸受ユニットを造る場合に、かしめ部
１６の形成作業に伴って、内側に設けた第二の内輪１３
の内端部に、径方向外方に向いた大きな力が加わり、こ
の内端部が径方向外方に弾性変形する。そして、弾性変
形した場合には、この第二の内輪１３の外周面に形成し
た第二の内輪軌道９の断面形状が所望のものからずれ
て、この第二の内輪軌道９と各円すいころ３、３の転動
面との当接部の一部にエッジロードが加わり易くなる。When the double-row tapered roller bearing unit for supporting a wheel as described above is manufactured, the second inner ring 13 provided inside is formed along with the operation of forming the caulking portion 16.
A large radially outward force is applied to the inner end of the, and the inner end is elastically deformed radially outward. If the second inner raceway 9 is elastically deformed, the cross-sectional shape of the second inner raceway 9 formed on the outer peripheral surface of the second inner raceway 13 is deviated from the desired shape, and the second inner raceway 9 and each tapered roller 3 The edge load is easily applied to a part of the contact portion with the rolling surface of No. 3.

【００１０】即ち、上記第二の内輪軌道９にエッジロー
ドの発生を防止する為に施したクラウニングの形状が崩
れる為、エッジロードの発生防止が不確実になる。具体
的には、上記第二の内輪軌道９に施したクラウニングの
うち、軸方向内端寄り部分の落ち量が減少若しくは消失
してしまう。この結果、上記第二の内輪軌道９の内端部
と上記各円すいころ３、３の転動面の内端縁との当接部
に、エッジロードに基づく高面圧が加わり易くなる。こ
の様なエッジロードに基づく高面圧は、上記第二の内輪
軌道９の転がり疲れ寿命を短くする原因となる為、好ま
しくない。本発明の車輪支持用複列円すいころ軸受ユニ
ットは、上述の様な事情に鑑みて発明したものである。In other words, the shape of the crowning applied to the second inner raceway 9 to prevent the occurrence of an edge load is lost, and the prevention of the occurrence of the edge load becomes uncertain. Specifically, of the crowning applied to the second inner raceway 9, the amount of drop in the portion near the inner end in the axial direction decreases or disappears. As a result, the contact portion between the inner edge of the inner end portion and the rolling surfaces of the respective tapered rollers 3, 3 of the second inner ring raceway 9, easily applied high surface pressure based on the edge load. Such a high surface pressure based on the edge load is not preferable because it causes a reduction in the rolling fatigue life of the second inner raceway 9. The double-row tapered roller bearing unit for wheel support of the present invention has been invented in view of the above-mentioned circumstances.

【００１１】[0011]

【課題を解決するための手段】本発明の車輪支持用複列
円すいころ軸受ユニットは、前述の図１又は図２に示し
た様な、先に考えた車輪支持用複列円すいころ軸受ユニ
ットと同様に、外輪と、ハブと、複数の円すいころとを
備える。このうちの外輪は、それぞれが円すい凹面状で
互いに逆方向に傾斜した第一、第二の外輪軌道を内周面
に形成している。又、上記ハブは、それぞれが円すい凸
面状で互いに逆方向に傾斜した第一、第二の内輪軌道を
外周面に設けている。又、上記各円すいころは、これら
第一、第二の内輪軌道と上記第一、第二の外輪軌道との
間にそれぞれ複数個ずつ転動自在に設けられている。そ
して、上記ハブは、外周面の中間部に上記第一の内輪軌
道を直接又は内輪を介して設けたハブ本体と、外周面に
上記第二の内輪軌道を形成した別体の内輪とから成る。
更に、このうちのハブ本体は、外周面の外端部に車輪を
支持する為のフランジを形成すると共に、外周面の少な
くとも内端部分に、上記別体の内輪を外嵌固定する為の
支持段部を設けている。そして、上記別体の内輪はこの
支持段部に、外端面をこの支持段部の外端部に存在する
段差面に当接させると共に、上記ハブ本体の内端部に設
けた円筒部を径方向外方に塑性変形する事により形成し
たかしめ部により内端面を抑え付ける事で支持固定され
ている。又、少なくとも上記第二の内輪軌道に、クラウ
ニングを施している。特に、本発明の車輪支持用複列円
すいころ軸受ユニットに於いては、上記クラウニングの
曲率半径の中心位置を、上記第二の内輪軌道の軸方向中
央位置よりも外方にずらす事により、この第二の内輪軌
道の内端部での上記クラウニングの落ち量を、同じく外
端部での落ち量よりも大きくしている。The double-row tapered roller bearing unit for supporting a wheel according to the present invention is similar to the double-row tapered roller bearing unit for supporting a wheel as previously shown in FIG. 1 or FIG. Similarly, it includes an outer ring, a hub, and a plurality of tapered rollers. Of these, the outer race has first and second outer raceways formed on the inner peripheral surface, each of which has a conical concave shape and is inclined in opposite directions. Further, the hub has first and second inner ring raceways provided on the outer peripheral surface, each of which has a conical convex shape and is inclined in opposite directions. Also, a plurality of the above-described tapered rollers are provided so as to be freely rolled by a plurality of pieces, respectively, between the first and second inner raceways and the first and second outer raceways. The hub includes a hub body provided with the first inner raceway directly or via the inner race at an intermediate portion of the outer circumferential surface, and a separate inner race formed with the second inner raceway on the outer circumferential surface. .
Further, the hub body has a flange for supporting the wheel at the outer end of the outer peripheral surface, and a support for externally fixing the separate inner ring to at least the inner end of the outer peripheral surface. A step is provided. The separate inner ring has an outer end surface in contact with the support step portion and an outer end surface in contact with a step surface present in an outer end portion of the support step portion, and a cylindrical portion provided in the inner end portion of the hub body. It is supported fixed by putting suppressed inner end face by caulking portion formed by plastic deformation in the outward direction. At least the second inner raceway is crowned. In particular, in the double-row tapered roller bearing unit for wheel support of the present invention, by shifting the center position of the radius of curvature of the crowning outward from the axial center position of the second inner raceway, The amount of drop of the crowning at the inner end of the second inner raceway is also larger than the amount of drop at the outer end.

【００１２】[0012]

【作用】上述の様な本発明の車輪支持用複列円すいころ
軸受ユニットによれば、ハブ本体の内端部に設けた円筒
部を径方向外方に塑性変形させてかしめ部を形成するの
に伴って、別体の内輪の内端部が径方向外方に弾性変形
した場合でも、この内輪の外周面に設けた第二の内輪軌
道のクラウニングの機能を、この第二の内輪軌道の内端
部分でも確保できる。この為、この第二の内輪軌道と円
すいころの転動面の内端縁との当接部にエッジロードが
加わりにくくなって、この第二の内輪軌道の転がり疲れ
寿命を確保できる。According to the double row tapered roller bearing unit for supporting a wheel of the present invention as described above, the caulked portion is formed by plastically deforming the cylindrical portion provided at the inner end of the hub body radially outward. With this, even when the inner end of the separate inner ring is elastically deformed radially outward, the function of crowning the second inner ring raceway provided on the outer peripheral surface of the inner race It can also be secured at the inner end. For this reason, it is difficult for an edge load to be applied to the contact portion between the second inner raceway and the inner end edge of the rolling surface of the tapered roller, so that the rolling fatigue life of the second inner raceway can be ensured.

【００１３】[0013]

【発明の実施の形態】図４は、本発明の実施の形態の１
例を示している。尚、本発明の特徴は、かしめ部１６
（図１〜２参照）の形成作業に伴って第二の内輪１３ａ
の内端部に加わる、径方向外方に向いた力によってこの
第二の内輪１３ａの外周面に形成した第二の内輪軌道９
ａの形状が変化した場合でも、この第二の内輪軌道９ａ
に施したクラウニングの機能を確保できる様にする点に
ある。その他の部分の構成及び作用は、前述の図１又は
図２に示した構造と同様であるから、同等部分に関する
図示並びに説明は省略若しくは簡略にし、以下、本発明
の特徴部分を中心に説明する。FIG. 4 shows a first embodiment of the present invention.
An example is shown. The feature of the present invention is that
(See FIGS. 1 and 2), the second inner ring 13a
A second inner raceway 9 formed on the outer peripheral surface of the second inner race 13a by a radially outward force applied to the inner end of the second inner raceway 9
a of the second inner raceway 9a
The point is to ensure the function of the crowning that has been performed. Since the configuration and operation of the other parts are the same as those of the structure shown in FIG. 1 or FIG. 2, the illustration and description of the equivalent parts are omitted or simplified, and the following description will focus on the characteristic parts of the present invention. .

【００１４】本発明の車輪支持用複列円すいころ軸受ユ
ニットの場合、上記第二の内輪軌道９ａに施すクラウニ
ングの曲率半径Ｒ、ｒの中心位置を、図４に示す様に、
この第二の内輪軌道９ａの軸方向中央位置よりも外方に
ずらせている。即ち、上記両曲率半径Ｒ、ｒの中心を、
上記第二の内輪軌道９ａの軸方向中心でこの第二の内輪
軌道９ａと直交する直線である、中心線αよりも外方に
存在し、この中心線αと平行な直線β上に位置させてい
る。この様に、上記両曲率半径Ｒ、ｒの中心を外方にず
らす事により、上記第二の内輪軌道９ａの内端部での上
記クラウニングの落ち量を、同じく外端部での落ち量よ
りも大きくしている。In the case of the double row tapered roller bearing unit for supporting wheels of the present invention, the center position of the radius of curvature R, r of the crowning applied to the second inner raceway 9a is, as shown in FIG.
The second inner raceway 9a is shifted outward from the axial center position. That is, the center of the two radii of curvature R and r is
The center of the second inner raceway 9a in the axial direction is a straight line orthogonal to the second inner raceway 9a, which is located outside the center line α and is positioned on a straight line β parallel to the centerline α. ing. Thus, the both the radius of curvature R, by shifting the center of r outwardly, the drop amount of the crowning at the inner end of the second inner ring raceway 9a, also from falling amount at the outer end portion Is also bigger.

【００１５】即ち、上記曲率中心が存在する上記直線β
から上記第二の内輪軌道９ａの中間部２１ａの軸方向外
端縁までの距離ｘ0 ´を、同じく内端縁までのｘ0 ″よ
りも小さく（ｘ0 ´＜ｘ0 ″）している。同様に、上記
直線βから上記第二の内輪軌道９ａの外側の端部２２ａ
の軸方向外端縁までの距離ｙ0 ´を、同じく内側の端部
２２ｂの内端縁までのｙ0 ″よりも小さく（ｙ0 ´＜ｙ
0 ″）している。従って、上記中間部２１ａの両端部の
落ち量δ0 ´、δ0 ″同士を比較した場合、軸方向外端
縁側の落ち量δ0 ´よりも、内端縁側の落ち量δ0 ″が
大きく（δ0 ´＜δ0 ″）なる。又、外側の端部２２ａ
の軸方向外端縁の落ち量δ1 ´を、同じく内側の端部２
２ｂの内端縁の落ち量δ1 ″とを比較した場合、外側の
端部２２ａの軸方向外端縁の落ち量δ1 ´よりも、内側
の端部２２ｂの内端縁の落ち量δ 1 ″が大きく（δ1 ´
＜δ1 ″）なる。That is, the straight line β where the center of curvature exists
Axially outside the intermediate portion 21a of the second inner raceway 9a
The distance to the edge x0 ′ Is also x to the inner edge0 ″ Yo
Smaller (x0 ´ <x0 ″). Similarly, above
From the straight line β, the outer end 22a of the second inner raceway 9a
Distance y to the axial outer edge of0 ´, also the inner end
Y to the inner edge of 22b0 (Y0 ´ <y
0 )). Therefore, both ends of the intermediate portion 21a are
Drop δ0 ´, δ0 ″ When compared with each other,
Edge drop δ0 Δ0 "But
Large (δ0 ´ <δ0 )) And the outer end 22a.
Of the outer edge in the axial direction1 ′ To the inner end 2
2b inner edge drop δ1 ″, The outer
Amount of drop δ at the outer edge in the axial direction of the end 22a1 Inside than ´
Fallen amount of the inner edge of the end portion 22b [delta] 1 ″ Is large (δ1 ´
<Δ1 ")Become.

【００１６】上述の様な本発明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１１の内端部に設
けた円筒部１５を径方向外方に塑性変形させてかしめ部
１６（図１〜２参照）を形成するのに伴って、別体の内
輪である前記第二の内輪１３ａの内端部が径方向外方に
弾性変形した場合でも、この第二の内輪１３ａの外周面
に設けた第二の内輪軌道９ａのクラウニングの機能を、
この第二の内輪軌道９ａの内端部分でも確保できる。こ
の為、この第二の内輪軌道９ａと各円すいころ３、３
（図１〜２参照）の転動面の内端縁との当接部にエッジ
ロードが加わりにくくなって、上記第二の内輪軌道９ａ
の転がり疲れ寿命を確保できる。According to the wheel supporting double row tapered roller bearing unit of the above such present invention, the caulking portion 16 by plastically deforming the cylindrical portion 15 provided in the inner end radially outwardly of the hub body 11 ( (See FIGS. 1 and 2), even if the inner end of the second inner race 13a, which is a separate inner race, is elastically deformed radially outward, the outer periphery of the second inner race 13a is formed. The crowning function of the second inner raceway 9a provided on the surface
The inner end of the second inner raceway 9a can be secured. For this reason, the second inner raceway 9a and each of the tapered rollers 3, 3
(See FIGS. 1 and 2) The edge load is less likely to be applied to the abutting portion of the rolling surface of the second inner raceway 9a.
Rolling fatigue life can be ensured.

【００１７】尚、前記直線βを前記中心線αからどの程
度ずらせるか、延ては、上記各落ち量δ0 ´、δ0 ″、
δ1 ´、δ1 ″の差をどの程度にするかは、車輪支持用
複列円すいころ軸受ユニットの大きさ、肉厚、材料、使
用時に加わる荷重等に応じて、実験、コンピュータ解析
等により、設計的に定める。Note that how much the straight line β is displaced from the center line α is, in other words, the amount of drop δ 0 ′, δ 0 ″,
The difference between δ 1 ′ and δ 1 ″ is determined by experiments, computer analysis, etc., according to the size, thickness, material, load applied during use, etc. of the double-row tapered roller bearing unit for wheel support. , Determined by design.

【００１８】[0018]

【発明の効果】本発明は、以上に述べた通り構成され作
用するので、優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実現できる。Since the present invention is constructed and operates as described above, a double-row tapered roller bearing unit for supporting wheels having excellent durability can be realized.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の対象となる構造の第１例を示す断面
図。FIG. 1 is a sectional view showing a first example of a structure to which the present invention is applied.

【図２】同第２例を示す断面図。FIG. 2 is a sectional view showing the second example.

【図３】従来構造のクラウニングを誇張して示す、図１
のＡ部に相当する図。FIG. 3 shows an exaggerated view of the crowning of a conventional structure, FIG.
FIG.

【図４】同じく、本発明のクラウニングを誇張して示
す、図１のＡ部に相当する図。FIG. 4 is a view corresponding to a portion A in FIG. 1 and shows the crowning of the present invention in an exaggerated manner.

【符号の説明】[Explanation of symbols]

１ 外輪 ２、２ａ ハブ ３ 円すいころ ４ 第一の外輪軌道 ５ 第二の外輪軌道 ６ 取付部 ７ フランジ ８、８ａ 第一の内輪軌道 ９、９ａ 第二の内輪軌道 １０ 保持器 １１、１１ａ ハブ本体 １２ 第一の内輪 １３、１３ａ 第二の内輪 １４ 支持段部 １５ 円筒部 １６ かしめ部 １７、１７ａ 段差面 １８ スプライン孔 １９、１９ａ シールリング ２０ 空間 ２１、２１ａ 中間部 ２２、２２ａ、２２ｂ 端部 ２３ 内輪 ２４ 支持段部 Reference Signs List 1 outer ring 2, 2a hub 3 tapered roller 4 first outer ring track 5 second outer ring track 6 mounting portion 7 flange 8, 8a first inner ring track 9, 9a second inner ring track 10 retainer 11, 11a hub body Reference Signs List 12 First inner ring 13, 13a Second inner ring 14 Support step portion 15 Cylindrical portion 16 Caulking portion 17, 17a Step surface 18 Spline hole 19, 19a Seal ring 20 Space 21, 21a Intermediate portion 22, 22a, 22b End 23 Inner ring 24 support step

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 それぞれが円すい凹面状で互いに逆方向
に傾斜した第一、第二の外輪軌道を内周面に形成した外
輪と、それぞれが円すい凸面状で互いに逆方向に傾斜し
た第一、第二の内輪軌道を外周面に設けたハブと、これ
ら第一、第二の内輪軌道と上記第一、第二の外輪軌道と
の間にそれぞれ複数個ずつ転動自在に設けられた円すい
ころとを備え、上記ハブは、外周面の中間部に上記第一
の内輪軌道を直接又は内輪を介して設けたハブ本体と、
外周面に上記第二の内輪軌道を形成した別体の内輪とか
ら成り、このうちのハブ本体は、外周面の外端部に車輪
を支持する為のフランジを形成すると共に、外周面の少
なくとも内端部分を上記別体の内輪を外嵌固定する為の
支持段部としており、上記別体の内輪はこの支持段部
に、外端面をこの支持段部の外端部に存在する段差面に
当接させると共に、上記ハブ本体の内端部に設けた円筒
部を径方向外方に塑性変形する事により形成したかしめ
部により内端面を抑え付ける事で支持固定されており、
少なくとも上記第二の内輪軌道に、クラウニングを施し
ている車輪支持用複列円すいころ軸受ユニットに於い
て、このクラウニングの曲率半径の中心位置を、上記第
二の内輪軌道の軸方向中央位置よりも外方にずらす事に
より、この第二の内輪軌道の内端部での上記クラウニン
グの落ち量を、同じく外端部での落ち量よりも大きくし
た事を特徴とする車輪支持用複列円すいころ軸受ユニッ
ト。1. An outer ring having first and second outer raceways formed on an inner peripheral surface each having a conical concave surface and inclined in opposite directions, and a first outer ring each having a conical convex shape and inclined in opposite directions. A hub provided with a second inner raceway on the outer peripheral surface thereof; and a plurality of tapered rollers provided so as to be able to freely roll between the first and second inner raceways and the first and second outer raceways, respectively. A hub body provided with the first inner raceway directly or via an inner race at an intermediate portion of an outer peripheral surface,
And a separate inner ring having the second inner ring raceway formed on the outer peripheral surface, and the hub body includes a flange for supporting the wheel at the outer end of the outer peripheral surface, and at least the outer peripheral surface. The inner end portion is a supporting step portion for externally fitting and fixing the separate inner ring, and the separate inner ring is provided on the supporting step portion, and the outer end surface is provided on a step surface existing on the outer end portion of the supporting step portion. And is fixedly supported by suppressing the inner end surface by a caulking portion formed by plastically deforming the cylindrical portion provided at the inner end portion of the hub body radially outward,
In at least the second inner raceway, in the wheel supporting double row tapered roller bearing unit that is crowning, the center position of the radius of curvature of the crowning is more than the axial center position of the second inner raceway. A double row tapered roller for wheel support characterized in that the amount of drop of the crowning at the inner end of the second inner raceway is made larger than the amount of drop at the outer end of the second inner raceway by being shifted outward. Bearing unit.
JP2000359910A 2000-11-27 2000-11-27 Double-row cone roller bearing unit for holding wheel Pending JP2002168246A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000359910A JP2002168246A (en) 2000-11-27 2000-11-27 Double-row cone roller bearing unit for holding wheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000359910A JP2002168246A (en) 2000-11-27 2000-11-27 Double-row cone roller bearing unit for holding wheel

Publications (1)

Publication Number Publication Date
JP2002168246A true JP2002168246A (en) 2002-06-14

Family

ID=18831594

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000359910A Pending JP2002168246A (en) 2000-11-27 2000-11-27 Double-row cone roller bearing unit for holding wheel

Country Status (1)

Country Link
JP (1) JP2002168246A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008045597A (en) * 2006-08-11 2008-02-28 Ntn Corp Tapered roller bearing and pilot portion shaft supporting structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008045597A (en) * 2006-08-11 2008-02-28 Ntn Corp Tapered roller bearing and pilot portion shaft supporting structure

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