JP2007333047A - Bearing device for wheel - Google Patents

Bearing device for wheel Download PDF

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Publication number
JP2007333047A
JP2007333047A JP2006164249A JP2006164249A JP2007333047A JP 2007333047 A JP2007333047 A JP 2007333047A JP 2006164249 A JP2006164249 A JP 2006164249A JP 2006164249 A JP2006164249 A JP 2006164249A JP 2007333047 A JP2007333047 A JP 2007333047A
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Prior art keywords
inner ring
roller
bearing device
corner
raceway
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JP2006164249A
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Japanese (ja)
Inventor
Chiyoukoku Uchiyama
暢克 内山
Kiyotake Shibata
清武 柴田
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2006164249A priority Critical patent/JP2007333047A/en
Publication of JP2007333047A publication Critical patent/JP2007333047A/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
    • F16C33/30—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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/34—Rollers; Needles
    • F16C33/36—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces
    • F16C33/366—Tapered rollers, i.e. rollers generally shaped as truncated cones
    • 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

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel capable of improving bearing service life by preventing increase of surface pressure near a base of an inner ring large flange, and reduction of a contact area of a roller and a raceway surface. <P>SOLUTION: This double row conical roller bearing type bearing device for the wheel has conical rollers 3 disposed between raceway surfaces 5, 6 of an inner ring 1 and an outer ring 2, the outer ring 2 does not have a flange, and the inner ring 1 has the large flange 7. A corner portion 9 between the large flange 7 of the inner ring 1 and the raceway surface 5 has the circular arcuate cross section finished by grinding. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、円すいころ軸受型の車輪用軸受装置に関する。   The present invention relates to a tapered roller bearing type wheel bearing device.

従来、トラック用等の車輪用軸受装置として、円すいころ軸受型のものが種々提案されている（例えば、特許文献１）。このような円すいころ軸受型の車輪用軸受装置は、一般的な複列円すいころ軸受と同じく、図２に示すように、内輪１の大鍔７と軌道面５との間の隅部に、円すいころ３と干渉しないように、盗み部１１を形成している。
特開２００１−１０３０４号公報 Conventionally, various types of tapered roller bearings have been proposed as wheel bearing devices for trucks and the like (for example, Patent Document 1). Such a tapered roller bearing type wheel bearing device is similar to a general double row tapered roller bearing, as shown in FIG. 2, at the corner between the large collar 7 of the inner ring 1 and the raceway surface 5. A stealing portion 11 is formed so as not to interfere with the tapered roller 3.
JP 2001-10304 A

従来の円すいころ軸受型の車輪用軸受装置は、上記のように、内輪１の大鍔７と軌道面５との間の隅部に盗み部１１を形成しているため、荷重が作用すると、内輪大鍔７の根元にある盗み部１１の周辺の面圧が高くなる。また、盗み部１１を作ることで、ころ３と軌道面５との接触面積が小さくなる。車輪用軸受装置では、車両の旋回走行や加速等により、軸受にモーメント荷重や種々の方向の厳しい荷重が作用するため、上記のように盗み部１１の周辺の面圧が高くなったり、ころ３の接触面積が小さくなると、軸受強度や軸受寿命の低下への影響が大きい。   In the conventional tapered roller bearing type wheel bearing device, as described above, the stealed portion 11 is formed in the corner portion between the large collar 7 of the inner ring 1 and the raceway surface 5, so that when a load is applied, The surface pressure around the stealing part 11 at the base of the inner ring collar 7 is increased. Moreover, the contact area of the roller 3 and the track surface 5 becomes small by making the stealing part 11. In the wheel bearing device, moment load and severe loads in various directions act on the bearing due to turning or acceleration of the vehicle, so that the surface pressure around the stealing portion 11 increases as described above, or the roller 3 When the contact area becomes smaller, the bearing strength and bearing life are greatly affected.

この発明の目的は、内輪大鍔の根元付近の面圧の増加や、ころと軌道面との接触面積の低下を抑え、軸受強度および軸受寿命の向上を図ることのできる車輪用軸受装置を提供することである。   An object of the present invention is to provide a wheel bearing device capable of suppressing an increase in surface pressure near the root of an inner ring large collar and a decrease in contact area between a roller and a raceway surface and improving bearing strength and bearing life. It is to be.

この発明の車輪用軸受装置は、内輪と外輪の軌道面間に円すい形のころが介在し、外輪が鍔なし、内輪が大鍔を有する複列円すいころ軸受型の車輪用軸受装置であって、内輪の大鍔の内側面と軌道面との間の隅部を、研削仕上げの断面円弧状としたことを特徴とする。なお、隅部は研削仕上げ以外の方法でもよい。
この構成によると、内輪の大鍔の内側面と軌道面との間の隅部を、研削仕上げの断面円弧状としたため、上記角部に盗み部を形成した場合に比べて、軸受に荷重が作用した場合に、内輪の大鍔の根元部の面圧が高くなることが回避される。また、隅部を断面円弧状としたため、盗み部を形成した場合と比べて、ころのエッジ当たりを防止するにつき、ころと内輪との接触面積の低下が小さくて済む。これらのため、荷重作用時の軸受の長寿命化が可能となる。内輪大鍔の隅部を研削仕上げとすることによっても、旋削により形成される盗み部を設ける場合に比べて、応力集中が生じ難く、軸受の高強度化や長寿命化に好ましい。 The wheel bearing device of the present invention is a double-row tapered roller bearing type wheel bearing device in which a tapered roller is interposed between the raceway surfaces of the inner ring and the outer ring, the outer ring has no flange, and the inner ring has a large cage. The corner between the inner side surface of the inner ring and the raceway surface has an arcuate cross section. The corner may be formed by a method other than grinding.
According to this configuration, the corner between the inner surface of the inner ring of the inner ring and the raceway has an arcuate cross-section with a ground finish, so that a load is applied to the bearing compared to the case where the stealed portion is formed at the corner. When it acts, it is avoided that the surface pressure of the root portion of the inner ring is increased. In addition, since the corner portion has an arcuate cross section, the contact area between the roller and the inner ring can be reduced less in preventing the roller from hitting the edge than when the stealing portion is formed. For these reasons, it is possible to extend the life of the bearing when a load is applied. Even if the corner of the inner ring collar is ground, stress concentration is less likely to occur than in the case of providing a stealed portion formed by turning, which is preferable for increasing the strength and life of the bearing.

この発明において、前記ころが、大端面と外周面との間の角部に面取部を有し、前記内輪の大鍔と軌道面間の隅部が、前記ころに干渉しない曲率半径であっても良い。大鍔と軌道面間の隅部の曲率半径を、ころの大端面の面取部よりも小さな曲率半径とすることで、内輪の上記隅部がころに干渉しないようにできる。このように、隅部の曲率半径を適宜設計することで、断面円弧状の隅部の形成によりころと内輪との干渉を回避できる。   In this invention, the roller has a chamfered portion at a corner between the large end surface and the outer peripheral surface, and a corner between the large collar of the inner ring and the raceway surface has a radius of curvature that does not interfere with the roller. May be. By setting the radius of curvature of the corner between the collar and the raceway surface to be smaller than that of the chamfered portion of the large end surface of the roller, the corner of the inner ring can be prevented from interfering with the roller. As described above, by appropriately designing the radius of curvature of the corner, it is possible to avoid the interference between the roller and the inner ring by forming the corner having an arcuate cross section.

前記ころの面取部は、断面円弧状であって、ころの軸心を含む断面における面取部の軸方向の寸法および半径方向の寸法がいずれも１．５mm以下であることが好ましい。
ころの面取部を１．５mm以下とすることで、面取部の形成による、ころと内輪との接触面積の低下をできるだけ緩和し、長寿命化を図ることができる。
なお、ころの上記隅部の最小寸法は、０．５mm以上とすることが好ましい。 It is preferable that the chamfered portion of the roller has a circular arc cross section, and the axial dimension and the radial dimension of the chamfered section in a cross section including the roller axis are both 1.5 mm or less.
By setting the chamfered portion of the roller to 1.5 mm or less, a reduction in the contact area between the roller and the inner ring due to the formation of the chamfered portion can be alleviated as much as possible, and the life can be extended.
The minimum dimension of the corner of the roller is preferably 0.5 mm or more.

この発明の車輪用軸受装置は、内輪と外輪の軌道面間に円すい形のころが介在し、外輪が鍔なし、内輪が大鍔を有する複列円すいころ軸受型の車輪用軸受装置であって、内輪の大鍔の内側面と軌道面との間の隅部を、研削仕上げの断面円弧状としたため、内輪大鍔の根元付近の面圧の増加や、ころと軌道面との接触面積の低下を抑え、軸受強度や軸受寿命の向上を図ることができる。   The wheel bearing device of the present invention is a double-row tapered roller bearing type wheel bearing device in which a conical roller is interposed between raceway surfaces of an inner ring and an outer ring, the outer ring has no flange, and the inner ring has a large cage. Because the corner between the inner surface of the inner ring and the raceway surface has an arcuate cross section, the surface pressure near the root of the inner ring and the contact area between the rollers and the raceway is reduced. It is possible to suppress the decrease and improve the bearing strength and the bearing life.

この発明の一実施形態を図１と共に説明する。この車輪用軸受装置は、複列円すいころ軸受型の車輪用軸受装置であって、それぞれ一列の軌道面５を有する２個の内輪１と、２列の軌道面６を有する１個の外輪２と、各列の対向する軌道面５，６間に介在した複列の円すい形のころ３とを有する。各列のころ３は、各列毎に環状の保持器４のポケット内に保持されている。両列の軌道面５，６は、接触角が背面合わせ、つまり外向きとなるように設けられている。外輪２は、鍔無しとされる。各内輪１は、大鍔７および小鍔８を両端に有し、小鍔８側の端面で互いに隣接している。   An embodiment of the present invention will be described with reference to FIG. This wheel bearing device is a double row tapered roller bearing type wheel bearing device, and includes two inner rings 1 each having one row of raceway surfaces 5 and one outer ring 2 having two rows of raceway surfaces 6. And double-row conical rollers 3 interposed between the opposing raceway surfaces 5 and 6 of each row. The rollers 3 in each row are held in the pockets of the annular cage 4 for each row. Both rows of raceway surfaces 5 and 6 are provided so that the contact angles are aligned with each other, that is, outward. The outer ring 2 has no wrinkles. Each inner ring 1 has a large collar 7 and a small collar 8 at both ends, and is adjacent to each other on the end surface on the small collar 8 side.

図１（Ａ）のＩ部を同図（Ｂ）に拡大して示す。同図（Ｂ）のように、内輪１の大鍔７の内側面と軌道面５との間の隅部９は、研削仕上げの断面円弧状とされている。また、ころ３は、大端面３ｂと外周面３ａとの間の角部に、断面円弧状の面取部１０を有している。ころ３の上記面取部１０の寸法は、１．５mm以下、すなわち、ころ３の軸心を含む断面における面取部１０の軸方向の寸法ａ（図１（Ｃ））と、半径方向の寸法ｂとがいずれも１．５mm以下とされている。   Part I of FIG. 1A is enlarged and shown in FIG. As shown in FIG. 5B, the corner portion 9 between the inner surface of the large collar 7 of the inner ring 1 and the raceway surface 5 has an arcuate cross-section with a ground finish. Further, the roller 3 has a chamfered portion 10 having a circular arc cross section at a corner between the large end surface 3b and the outer peripheral surface 3a. The dimension of the chamfered portion 10 of the roller 3 is 1.5 mm or less, that is, the axial dimension a (FIG. 1C) of the chamfered portion 10 in the cross section including the axis of the roller 3 and the radial direction. Both dimensions b are 1.5 mm or less.

内輪１の大鍔７と軌道面５間の隅部９は、ころ３に干渉しない曲率半径とされる。すなわち、この隅部９の断面形状となる円弧の曲率半径ｒを、ころ３の大端面３ｂの面取部１０よりも小さな曲率半径とすることで、内輪３の隅部９がころ３に干渉しないようにしている。   A corner portion 9 between the large collar 7 of the inner ring 1 and the raceway surface 5 has a radius of curvature that does not interfere with the rollers 3. That is, by setting the radius of curvature r of the circular arc having the cross-sectional shape of the corner portion 9 to be smaller than that of the chamfered portion 10 of the large end surface 3 b of the roller 3, the corner portion 9 of the inner ring 3 interferes with the roller 3. I try not to.

この車輪用軸受装置は、ハブ（図示せず）の軸部の外周に内輪１を嵌合させることなどで、車輪の支持に使用される。   This wheel bearing device is used for supporting a wheel by fitting the inner ring 1 to the outer periphery of a shaft portion of a hub (not shown).

この構成の車輪用軸受装置によると、内輪１の大鍔７と軌道面５の間の隅部９を、研削仕上げの断面円弧状としたため、上記角部に盗み部を形成した場合に比べて、軸受に荷重が作用した場合に、内輪１の大鍔７の根元部の面圧が高くなることが回避される。また、隅部９を断面円弧状としたため、盗み部を形成した場合と比べて、ころ３のエッジ当たりを防止するにつき、ころ３と内輪１との接触面積の低下が小さくて済む。これらのため、荷重作用時の軸受の長寿命化が可能となる。内輪大鍔７の断面円弧状の隅部９を研削仕上げとすることによっても、旋削により形成される盗み部を設ける場合に比べて、応力集中が生じ難く、高強度化や長寿命化に好ましい。
ころの面取部１０の寸法は１．５mm以下としたため、面取部１０の形成による、ころ３と内輪１との接触面積の低下をできるだけ緩和し、長寿命化を図ることができる。また、ころ３の面取部１０の最小寸法を、０．５mm以上としたため、ころ３の面取部１０の機能が実質上得られなくなることが回避される。 According to the wheel bearing device of this configuration, since the corner portion 9 between the large collar 7 of the inner ring 1 and the raceway surface 5 has an arcuate cross section of grinding finish, compared to the case where the stealed portion is formed at the corner portion. When the load is applied to the bearing, it is avoided that the surface pressure of the root portion of the large collar 7 of the inner ring 1 becomes high. Further, since the corner portion 9 has an arc shape in cross section, the contact area between the roller 3 and the inner ring 1 can be reduced less in preventing the roller 3 from hitting the edge than when the stealing portion is formed. For these reasons, it is possible to extend the life of the bearing when a load is applied. Even if the corner 9 having an arcuate cross section of the inner ring collar 7 is ground, stress concentration is less likely to occur than in the case of providing a stealed portion formed by turning, which is preferable for increasing strength and extending the service life. .
Since the chamfered portion 10 of the roller has a dimension of 1.5 mm or less, the reduction in the contact area between the roller 3 and the inner ring 1 due to the formation of the chamfered portion 10 can be alleviated as much as possible, and the life can be extended. Further, since the minimum dimension of the chamfered portion 10 of the roller 3 is set to 0.5 mm or more, it is avoided that the function of the chamfered portion 10 of the roller 3 is not substantially obtained.

なお、上記実施形態は、内輪１がハブと独立して設けられた車輪用軸受装置に適用した場合につき説明したが、この発明は、ハブと内輪が一体化された車輪用軸受装置、例えばハブの軸部に片方の列の軌道面を有する内輪を嵌合させ、ハブに直接にもう片方の内輪軌道面を形成した形式の車輪用軸受装置にも適用することができる。   In the above embodiment, the case where the inner ring 1 is applied to a wheel bearing device provided independently of the hub has been described. However, the present invention relates to a wheel bearing device in which the hub and the inner ring are integrated, for example, a hub. The present invention can also be applied to a wheel bearing device of a type in which an inner ring having a raceway surface in one row is fitted to the shaft portion and the other inner ring raceway surface is formed directly on the hub.

（Ａ）はこの発明一実施形態に係る車輪用軸受装置の断面図、（Ｂ）は同図（Ａ）のＩ部の拡大断面図、（Ｃ）はそのころの一部を示す拡大図である。(A) is sectional drawing of the wheel bearing apparatus which concerns on one Embodiment of this invention, (B) is an expanded sectional view of the I section of the same figure (A), (C) is an enlarged view which shows a part of the roller. is there. （Ａ）は従来の車輪用軸受装置の断面図、（Ｂ）はそのII部の拡大断面図である。(A) is sectional drawing of the conventional wheel bearing apparatus, (B) is an expanded sectional view of the II section.

符号の説明Explanation of symbols

１…内輪
２…外輪
３…ころ
５，６…軌道面
７…大鍔
９…内輪の隅部
１０…ころの面取部 DESCRIPTION OF SYMBOLS 1 ... Inner ring 2 ... Outer ring 3 ... Rollers 5, 6 ... Raceway surface 7 ... Large collar 9 ... Corner of inner ring 10 ... Roller chamfer

Claims (4)

内輪と外輪の軌道面間に円すい形のころが介在し、外輪が鍔なし、内輪が大鍔を有する複列円すいころ軸受型の車輪用軸受装置であって、
内輪の大鍔の内側面と軌道面との間の隅部を、断面円弧状としたことを特徴とする車輪用軸受装置。 A double row tapered roller bearing type wheel bearing device in which a conical roller is interposed between the raceway surfaces of the inner ring and the outer ring, the outer ring has no flange, and the inner ring has a large flange,
A bearing device for a wheel, characterized in that a corner portion between an inner surface of the inner ring and a raceway surface has an arcuate cross section. 内輪と外輪の軌道面間に円すい形のころが介在し、外輪が鍔なし、内輪が大鍔を有する複列円すいころ軸受型の車輪用軸受装置であって、
内輪の大鍔の内側面と軌道面との間の隅部を、研削仕上げの断面円弧状としたことを特徴とする車輪用軸受装置。 A double row tapered roller bearing type wheel bearing device in which a conical roller is interposed between the raceway surfaces of the inner ring and the outer ring, the outer ring has no flange, and the inner ring has a large flange,
A wheel bearing device, characterized in that a corner portion between an inner surface of the inner ring and a raceway surface has an arcuate cross-section with a grinding finish. 請求項１または請求項２において、前記ころが、大端面と外周面との間の角部に面取部を有し、前記内輪の大鍔と軌道面間の隅部が、前記ころに干渉しない曲率半径である車輪用軸受装置。   3. The roller according to claim 1, wherein the roller has a chamfered portion at a corner portion between the large end surface and the outer peripheral surface, and a corner portion between the large collar of the inner ring and the raceway surface interferes with the roller. Wheel bearing device that does not have a radius of curvature. 請求項１ないし請求項３のいずれか１項において、前記ころが、大端面と外周面との間の角部に断面円弧状の面取部を有し、この面取部の寸法が長手方向、円周方向ともに１．５mm以下である車輪用軸受装置。
The roller according to any one of claims 1 to 3, wherein the roller has a chamfered portion having an arcuate cross section at a corner between the large end surface and the outer peripheral surface, and the dimension of the chamfered portion is a longitudinal direction. A wheel bearing device that is 1.5 mm or less in the circumferential direction.
JP2006164249A 2006-06-14 2006-06-14 Bearing device for wheel Pending JP2007333047A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015016345A1 (en) * 2013-08-02 2015-02-05 日本精工株式会社 Roller bearing and method for producing roller bearing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015016345A1 (en) * 2013-08-02 2015-02-05 日本精工株式会社 Roller bearing and method for producing roller bearing
JP2015031343A (en) * 2013-08-02 2015-02-16 日本精工株式会社 Roller bearing, and roller bearing manufacturing method

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