JP2008057596A - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP2008057596A
JP2008057596A JP2006233059A JP2006233059A JP2008057596A JP 2008057596 A JP2008057596 A JP 2008057596A JP 2006233059 A JP2006233059 A JP 2006233059A JP 2006233059 A JP2006233059 A JP 2006233059A JP 2008057596 A JP2008057596 A JP 2008057596A
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wheel
rolling elements
rolling
row
bearing device
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Kazuo Komori
和雄 小森
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2006233059A priority Critical patent/JP2008057596A/en
Priority to CN200780030330.3A priority patent/CN101505975B/en
Priority to DE112007001917.4T priority patent/DE112007001917B4/en
Priority to PCT/JP2007/000876 priority patent/WO2008020496A1/en
Publication of JP2008057596A publication Critical patent/JP2008057596A/en
Priority to US12/371,685 priority patent/US7651275B2/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device for increasing the rigidity of bearings and prolonging the life of the bearings while securing optimum lubricating conditions. <P>SOLUTION: The wheel bearing device comprises the double row rolling bearings. Herein, a pitch circle diameter PCDo of rolling elements 3 on the outer side out of double row rolling elements 3, 3 is set to be larger than a pitch circle diameter PCDi of the rolling elements 3 on the inner side, the double row rolling elements 3 are the same in size, and the number of the rolling elements 3 on the outer side is set to be greater than the number of the rolling elements 3 on the inner side, and a grease filled amount for right and left bearing trains is set to be a range of 40-60% of the internal space capacity of the right and left bearing trains. So, even when the double row rolling elements 3 are different in pitch circle diameter and the right and left bearing trains are different in internal space capacity, the optimum grease filled amount can be secured while solving such a trouble that grease leakage occurs during operation or rotating torque is increased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、自動車等の車輪を回転自在に支承する車輪用軸受装置、特に、軸受剛性を増大させると共に、最適な潤滑条件を確保して軸受の長寿命化を図った車輪用軸受装置に関するものである。   BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like, and more particularly to a wheel bearing device that increases bearing rigidity and ensures optimum lubrication conditions to extend the life of the bearing. It is.

従来から自動車等の車輪を支持する車輪用軸受装置は、車輪を取り付けるためのハブ輪を転がり軸受を介して回転自在に支承するもので、駆動輪用と従動輪用とがある。構造上の理由から、駆動輪用では内輪回転方式が、従動輪用では内輪回転と外輪回転の両方式が一般的に採用されている。この車輪用軸受装置には、所望の軸受剛性を有し、ミスアライメントに対しても耐久性を発揮すると共に、燃費向上の観点から回転トルクが小さい複列アンギュラ玉軸受が多用されている。この複列アンギュラ玉軸受は、固定輪と回転輪との間に複数のボールを介在させ、このボールに所定の接触角を付与して固定輪および回転輪に接触させている。   2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like is such that a hub wheel for mounting a wheel is rotatably supported via a rolling bearing, and there are a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and an inner ring rotation method and an outer ring rotation method are generally used for driven wheels. As the wheel bearing device, a double-row angular ball bearing having a desired bearing rigidity, exhibiting durability against misalignment, and having a small rotational torque from the viewpoint of improving fuel efficiency is often used. In this double row angular contact ball bearing, a plurality of balls are interposed between a fixed ring and a rotating ring, and a predetermined contact angle is given to the balls so as to contact the fixed ring and the rotating ring.

また、車輪用軸受装置には、懸架装置を構成するナックルとハブ輪との間に複列アンギュラ玉軸受等からなる車輪用軸受を嵌合させた第１世代と称される構造から、外方部材の外周に直接車体取付フランジまたは車輪取付フランジが形成された第２世代構造、また、ハブ輪の外周に一方の内側転走面が直接形成された第３世代構造、あるいは、ハブ輪と等速自在継手の外側継手部材の外周にそれぞれ内側転走面が直接形成された第４世代構造とに大別されている。なお、以下の説明では、車両に組み付けた状態で車両の外側寄りとなる側をアウター側（図面左側）、中央寄り側をインナー側（図面右側）という。   Further, the wheel bearing device has a structure called a first generation in which a wheel bearing composed of a double row angular ball bearing or the like is fitted between a knuckle and a hub wheel constituting a suspension device. Second generation structure in which body mounting flange or wheel mounting flange is formed directly on the outer periphery of the member, third generation structure in which one inner rolling surface is directly formed on the outer periphery of the hub wheel, or hub wheel, etc. It is roughly classified into a fourth generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the speed universal joint. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

こうした複列の転がり軸受で構成された車輪用軸受装置において、従来は左右両列の軸受が同一仕様のため、静止時には充分な剛性を有するが、車両の旋回時には必ずしも最適な剛性が得られていない。すなわち、静止時の車重は複列の転がり軸受の略中央に作用するように車輪との位置関係が決められているが、旋回時には、旋回方向の反対側（右旋回の場合は車両の左側）の車軸に、より大きなラジアル荷重やアキシアル荷重が負荷される。したがって、旋回時には、インナー側の軸受列よりもアウター側の軸受列の剛性を高めることが有効とされている。そこで、装置を大型化させることなく高剛性化を図った車輪用軸受装置として、図３に示すものが知られている。   In such a wheel bearing device composed of double-row rolling bearings, the left and right rows of bearings have the same specifications so far. Absent. That is, the position of the vehicle weight when stationary is determined so that it acts on the approximate center of the double row rolling bearing, but when turning, the opposite side of the turning direction (when turning right, the vehicle Larger radial load or axial load is applied to the left axle. Therefore, at the time of turning, it is effective to increase the rigidity of the outer bearing row rather than the inner bearing row. Therefore, a wheel bearing device shown in FIG. 3 is known as a wheel bearing device that achieves high rigidity without increasing the size of the device.

この車輪用軸受装置５０は、外周にナックル（図示せず）に取り付けられるための車体取付フランジ５１ｃを一体に有し、内周に複列の外側転走面５１ａ、５１ｂが形成された外方部材５１と、一端部に車輪（図示せず）を取り付けるための車輪取付フランジ５３を一体に有し、外周に複列の外側転走面５１ａ、５１ｂに対向する一方の内側転走面５２ａと、この内側転走面５２ａから軸方向に延びる小径段部５２ｂが形成されたハブ輪５２、およびこのハブ輪５２の小径段部５２ｂに外嵌され、複列の外側転走面５１ａ、５１ｂに対向する他方の内側転走面５４ａが形成された内輪５４からなる内方部材５５と、これら両転走面間に収容された複列のボール５６、５７と、これら複列のボール５６、５７を転動自在に保持する保持器５８、５９とを備えた複列アンギュラ玉軸受で構成されている。   This wheel bearing device 50 has a vehicle body mounting flange 51c integrally attached to a knuckle (not shown) on the outer periphery, and an outer side in which double row outer rolling surfaces 51a and 51b are formed on the inner periphery. A member 51 and a wheel mounting flange 53 for mounting a wheel (not shown) at one end are integrally formed, and one inner rolling surface 52a facing the double row outer rolling surfaces 51a and 51b on the outer periphery. The hub wheel 52 formed with a small diameter step portion 52b extending in the axial direction from the inner rolling surface 52a and the small diameter step portion 52b of the hub wheel 52 are externally fitted to the double row outer rolling surface 51a, 51b. An inner member 55 composed of an inner ring 54 formed with the other inner rolling surface 54a facing each other, double rows of balls 56, 57 accommodated between both rolling surfaces, and these double rows of balls 56, 57 A retainer 58 for freely rolling It is composed of a double row angular contact ball bearing with a 9.

内輪５４は、ハブ輪５２の小径段部５２ｂを径方向外方に塑性変形させて形成した加締部５２ｃによって軸方向に固定されている。そして、外方部材５１と内方部材５５との間に形成される環状空間の開口部にシール６０、６１が装着され、軸受内部に封入された潤滑グリースの漏洩と、外部から軸受内部に雨水やダスト等が侵入するのを防止している。   The inner ring 54 is fixed in the axial direction by a caulking portion 52c formed by plastically deforming a small diameter step portion 52b of the hub wheel 52 radially outward. Seals 60 and 61 are attached to the opening of the annular space formed between the outer member 51 and the inner member 55, leakage of the lubricating grease sealed inside the bearing, and rainwater from the outside into the bearing. And dust are prevented from entering.

ここで、アウター側のボール５６のピッチ円直径Ｄ１が、インナー側のボール５７のピッチ円直径Ｄ２よりも大径に設定されている。これに伴い、ハブ輪５２の内側転走面５２ａが内輪５４の内側転走面５４ａよりも拡径され、あわせて外方部材５１のアウター側の外側転走面５１ａがインナー側の外側転走面５１ｂよりも拡径されている。そして、アウター側のボール５６がインナー側のボール５７よりも多数収容されている。このように、各ピッチ円直径Ｄ１、Ｄ２をＤ１＞Ｄ２に設定することにより、車両の静止時だけでなく旋回時においても剛性が向上し、車輪用軸受装置５０の長寿命化を図ることができる。
特開２００４−１０８４４９号公報 Here, the pitch circle diameter D1 of the outer side ball 56 is set to be larger than the pitch circle diameter D2 of the inner side ball 57. Along with this, the inner rolling surface 52a of the hub wheel 52 is expanded in diameter than the inner rolling surface 54a of the inner ring 54, and the outer rolling surface 51a on the outer side of the outer member 51 is also rolled on the inner side. The diameter is larger than that of the surface 51b. The outer side balls 56 are accommodated more than the inner side balls 57. As described above, by setting the pitch circle diameters D1 and D2 to D1> D2, the rigidity is improved not only when the vehicle is stationary but also when turning, and the life of the wheel bearing device 50 can be extended. it can.
JP 2004-108449 A

こうした車輪用軸受装置５０において、軸受製造時、グリースを軸受内部に封入する場合、図４に示すように、予め複列のボール５６、５７を保持器５８、５９で保持し、これらのボールカセットを外方部材５１に内嵌させた状態で、グリース封入治具６２を内挿（図中矢印方向）させてグリースを封入している。すなわち、グリース封入治具６２の放射方向に突設された左右複数本のノズル６２ａ、６２ｂをボールカセットに対峙させ、所定量のグリースを封入している。   In such a wheel bearing device 50, when the grease is sealed inside the bearing during manufacture of the bearing, as shown in FIG. 4, double rows of balls 56 and 57 are previously held by cages 58 and 59, and these ball cassettes are used. Is inserted into the outer member 51, and the grease sealing jig 62 is inserted (in the direction of the arrow in the figure) to enclose the grease. That is, a plurality of right and left nozzles 62a and 62b protruding in the radial direction of the grease sealing jig 62 are opposed to the ball cassette, and a predetermined amount of grease is sealed.

然しながら、この種の左右非対称の車輪用軸受装置５０では、所定量のグリースがそれぞれの軸受列に均等に封入されるため、インナー側の軸受列とアウター側の軸受列の内部空間容積が異なることにより、例えば、空間容積が小さいインナー側の軸受列では、空間容積に対してグリースが必要以上に封入されることになる。このように、グリース封入量が多くなれば、運転中におけるグリース漏れの発生や回転トルクが増大することがある。ここで、グリース漏れが発生するとブレーキの効きが悪くなる恐れがあり、また、回転トルク増大は自動車の燃費低下に繋がることになる。   However, in this type of left-right asymmetric wheel bearing device 50, a predetermined amount of grease is evenly sealed in the respective bearing rows, so that the inner space volumes of the inner side bearing row and the outer side bearing row are different. Thus, for example, in the inner bearing row having a small space volume, grease is sealed more than necessary with respect to the space volume. Thus, when the amount of grease filled increases, the occurrence of grease leakage during operation and the rotational torque may increase. Here, if grease leakage occurs, the braking effectiveness may be deteriorated, and an increase in rotational torque leads to a reduction in fuel consumption of the automobile.

本発明は、このような事情に鑑みてなされたもので、軸受剛性を増大させると共に、最適な潤滑条件を確保して軸受の長寿命化を図った車輪用軸受装置を提供することを目的としている。   The present invention has been made in view of such circumstances, and has an object to provide a wheel bearing device that increases bearing rigidity and ensures optimum lubrication conditions to extend the life of the bearing. Yes.

係る目的を達成すべく、本発明のうち請求項１記載の発明は、内周に複列の外側転走面が形成された外方部材と、外周に前記複列の外側転走面に対向する複列の内側転走面が設けられた内方部材と、この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備えた車輪用軸受装置において、前記複列の転動体のうちアウター側の転動体のピッチ円直径がインナー側の転動体のピッチ円直径よりも大径に設定されると共に、前記左右軸受列に封入されるグリース量が、当該左右軸受列の内部空間容積比に比例して設定されている。   In order to achieve the object, the invention according to claim 1 of the present invention is such that an outer member having a double row outer rolling surface formed on the inner periphery and an outer member facing the double row outer rolling surface on the outer periphery. A wheel provided with an inner member provided with a double-row inner rolling surface, and a double-row rolling element accommodated in a freely rollable manner between the inner member and both rolling surfaces of the outer member. In the bearing device, the pitch circle diameter of the outer side rolling elements of the double row rolling elements is set to be larger than the pitch circle diameter of the inner side rolling elements, and is enclosed in the left and right bearing rows. The amount of grease is set in proportion to the internal space volume ratio of the left and right bearing rows.

このように、第１乃至第４世代構造の車輪用軸受装置において、複列の転動体のうちアウター側の転動体のピッチ円直径がインナー側の転動体のピッチ円直径よりも大径に設定されると共に、左右軸受列に封入されるグリース量が、当該左右軸受列の内部空間容積比に比例して設定されているので、それぞれ複列の転動体のピッチ円直径が異なり、左右軸受列の内部空間容積が異なっていても最適なグリース封入量を確保することができる。したがって、軸受剛性を増大させると共に、最適な潤滑条件を確保して軸受の長寿命化を図った車輪用軸受装置を提供することができる。   As described above, in the wheel bearing device having the first to fourth generation structures, the pitch circle diameter of the outer side rolling element among the double row rolling elements is set larger than the pitch circle diameter of the inner side rolling element. Since the amount of grease sealed in the left and right bearing rows is set in proportion to the internal space volume ratio of the left and right bearing rows, the pitch circle diameters of the double row rolling elements are different from each other. Even if the internal space volume of each is different, the optimum amount of grease can be secured. Therefore, it is possible to provide a wheel bearing device that increases the bearing rigidity and ensures optimum lubrication conditions to extend the life of the bearing.

好ましくは、請求項２に記載の発明のように、前記左右軸受列のグリース封入量が、当該左右軸受列の内部空間容積の４０〜６０％の範囲に設定されていれば、運転中におけるグリース漏れの発生や回転トルクが増大すると言った不具合を解消することができる。   Preferably, as in the invention described in claim 2, if the amount of grease filled in the left and right bearing rows is set in the range of 40 to 60% of the internal space volume of the left and right bearing rows, the grease during operation Problems such as occurrence of leakage and increased rotational torque can be solved.

また、請求項３に記載の発明のように、前記複列の転動体のサイズが同じで、前記アウター側の転動体の個数が前記インナー側の転動体の個数よりも多く設定されていれば、高剛性化を図りながら軸受寿命を確保することができる。   Further, as in the invention described in claim 3, if the size of the double row rolling elements is the same and the number of the outer side rolling elements is set to be larger than the number of the inner side rolling elements. The bearing life can be ensured while achieving high rigidity.

また、請求項４に記載の発明のように、前記内方部材が、外周に前記複列の外側転走面に対向する一方の内側転走面と、この内側転走面から軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなると共に、前記ハブ輪のアウター側の端部にすり鉢状の凹所が形成され、この凹所の深さが少なくとも前記ハブ輪の内側転走面の溝底付近とされ、前記ハブ輪の外郭形状が当該凹所に対応して略均一な肉厚となるように形成されていれば、装置の軽量・コンパクト化と高剛性化という相反する課題を同時に解決することができる。   According to a fourth aspect of the present invention, the inner member has one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and extends in an axial direction from the inner rolling surface. A hub ring formed with a small-diameter step portion, and an inner ring press-fitted into the small-diameter step portion of the hub ring and formed with the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, A mortar-shaped recess is formed at the outer end of the hub wheel, and the depth of the recess is at least near the groove bottom of the inner raceway surface of the hub wheel. If it is formed so as to have a substantially uniform thickness corresponding to the recess, it is possible to simultaneously solve the conflicting problems of lightness, compactness and high rigidity of the apparatus.

本発明に係る車輪用軸受装置は、内周に複列の外側転走面が形成された外方部材と、外周に前記複列の外側転走面に対向する複列の内側転走面が設けられた内方部材と、この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備えた車輪用軸受装置において、前記複列の転動体のうちアウター側の転動体のピッチ円直径がインナー側の転動体のピッチ円直径よりも大径に設定されると共に、前記左右軸受列に封入されるグリース量が、当該左右軸受列の内部空間容積比に比例して設定されているので、それぞれ複列の転動体のピッチ円直径が異なり、左右軸受列の内部空間容積が異なっていても最適なグリース封入量を確保することができる。したがって、軸受剛性を増大させると共に、最適な潤滑条件を確保して軸受の長寿命化を図った車輪用軸受装置を提供することができる。   The wheel bearing device according to the present invention includes an outer member having a double row outer raceway formed on the inner periphery, and a double row inner raceway facing the outer row raceway on the outer periphery. In a wheel bearing device comprising: an inward member provided; and a double-row rolling element that is rotatably accommodated between both rolling surfaces of the inner member and the outer member, Among the rolling elements, the pitch circle diameter of the outer rolling elements is set to be larger than the pitch circle diameter of the inner rolling elements, and the amount of grease sealed in the left and right bearing rows Since it is set in proportion to the internal space volume ratio, the optimum grease filling amount can be ensured even if the pitch circle diameters of the double row rolling elements are different and the internal space volumes of the left and right bearing rows are different. . Therefore, it is possible to provide a wheel bearing device that increases the bearing rigidity and ensures optimum lubrication conditions to extend the life of the bearing.

外周にナックルに取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に前記複列の外側転走面に対向する一方の内側転走面と、この内側転走面から軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなる内方部材と、この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備え、前記小径段部の端部を径方向外方に塑性変形させて形成した加締部により前記内輪がハブ輪に対して軸方向に固定された車輪用軸受装置において、前記複列の転動体のうちアウター側の転動体のピッチ円直径がインナー側の転動体のピッチ円直径よりも大径に設定され、前記複列の転動体のサイズが同じで、前記アウター側の転動体の個数が前記インナー側の転動体の個数よりも多く設定されていると共に、前記左右軸受列のグリース封入量が、当該左右軸受列の内部空間容積の４０〜６０％の範囲に設定されている。   A body mounting flange for mounting to the knuckle on the outer periphery is integrated, an outer member with a double row outer raceway formed on the inner periphery, and a wheel mounting flange for mounting the wheel on one end is integrated. A hub wheel having one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, a small diameter step portion extending in the axial direction from the inner rolling surface, and a small diameter of the hub wheel An inner member consisting of an inner ring that is press-fitted into a stepped portion and has the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and both rolling of the inner member and the outer member A plurality of rolling elements accommodated so as to roll freely between the surfaces, and the inner ring is connected to the hub ring by a caulking portion formed by plastically deforming an end portion of the small diameter step portion radially outward. In the wheel bearing device fixed in the axial direction, the outer side rolling of the double row rolling elements. The pitch circle diameter of the inner side rolling element is set larger than the pitch circle diameter of the inner side rolling element, the size of the double row rolling elements is the same, and the number of the outer side rolling elements is the same as that of the inner side rolling element. More than the number, the amount of grease filled in the left and right bearing rows is set in the range of 40 to 60% of the internal space volume of the left and right bearing rows.

以下、本発明の実施の形態を図面に基づいて詳細に説明する。
図１は、本発明に係る車輪用軸受装置の一実施形態を示す縦断面図、図２は、図１の車輪用軸受装置のグリース封入工程を示す説明図である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, and FIG. 2 is an explanatory view showing a grease filling process of the wheel bearing device of FIG.

この車輪用軸受装置は第３世代と呼称される従動輪用であって、内方部材１と外方部材２、および両部材１、２間に転動自在に収容された複列の転動体（ボール）３、３とを備えている。内方部材１は、ハブ輪４と、このハブ輪４に所定のシメシロを介して圧入された内輪５とからなる。   This wheel bearing device is for a driven wheel referred to as a third generation, and is a double row rolling element housed in a freely rollable manner between the inner member 1 and the outer member 2, and both members 1 and 2. (Balls) 3 and 3. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4 through a predetermined shimiro.

ハブ輪４は、アウター側の端部に車輪（図示せず）を取り付けるための車輪取付フランジ６を一体に有し、外周に一方（アウター側）の内側転走面４ａと、この内側転走面４ａから軸方向に延びる軸状部７を介して小径段部４ｂが形成されている。車輪取付フランジ６にはハブボルト６ａが周方向等配に植設されると共に、これらハブボルト６ａ間には円孔６ｂが形成されている。この円孔６ｂは軽量化に寄与できるだけでなく、装置の組立・分解工程において、レンチ等の締結治具をこの円孔６ｂから挿入することができ作業を簡便化することができる。   The hub wheel 4 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outer side, and has one (outer side) inner rolling surface 4a on the outer periphery and the inner rolling surface. A small-diameter step portion 4b is formed through a shaft-like portion 7 extending in the axial direction from the surface 4a. Hub bolts 6a are implanted in the wheel mounting flange 6 in a circumferentially equal distribution, and circular holes 6b are formed between the hub bolts 6a. The circular hole 6b can not only contribute to weight reduction, but also a fastening jig such as a wrench can be inserted from the circular hole 6b in the assembly / disassembly process of the apparatus, and the work can be simplified.

内輪５は、外周に他方（インナー側）の内側転走面５ａが形成され、ハブ輪４の小径段部４ｂに圧入されて背面合せタイプの複列アンギュラ玉軸受を構成すると共に、小径段部４ｂの端部を塑性変形させて形成した加締部８によって内輪５が軸方向に固定されている。なお、内輪５および転動体３はＳＵＪ２等の高炭素クロム鋼で形成され、ズブ焼入れによって芯部まで５８〜６４ＨＲＣの範囲に硬化処理されている。   The inner ring 5 is formed with the other (inner side) inner raceway surface 5a on the outer periphery and is press-fitted into the small-diameter stepped portion 4b of the hub wheel 4 to form a back-to-back type double row angular contact ball bearing. The inner ring 5 is fixed in the axial direction by a caulking portion 8 formed by plastic deformation of the end portion of 4b. The inner ring 5 and the rolling element 3 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core part by quenching.

ハブ輪４はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中炭素鋼で形成され、内側転走面４ａをはじめ、車輪取付フランジ６のインナー側の基部６ｃから小径段部４ｂに亙って高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理されている。なお、加締部８は鍛造加工後の表面硬さのままとされている。これにより、車輪取付フランジ６に負荷される回転曲げ荷重に対して充分な機械的強度を有し、内輪５の嵌合部となる小径段部４ｂの耐フレッティング性が向上すると共に、微小なクラック等の発生がなく加締部８の塑性加工をスムーズに行うことができる。   The hub wheel 4 is formed of medium carbon steel containing carbon 0.40 to 0.80 wt% such as S53C, and the inner raceway surface 4a and the inner side base portion 6c of the wheel mounting flange 6 to the small diameter step portion 4b. Thus, the surface hardness is set to a range of 58 to 64 HRC by induction hardening. The caulking portion 8 is kept in the surface hardness after forging. Thereby, it has sufficient mechanical strength with respect to the rotational bending load applied to the wheel mounting flange 6, the fretting resistance of the small-diameter step portion 4b serving as the fitting portion of the inner ring 5 is improved, and the minute There is no occurrence of cracks and the like, and the plastic working of the caulking portion 8 can be performed smoothly.

外方部材２は、外周にナックル（図示せず）に取り付けられるための車体取付フランジ２ｃを一体に有し、内周にハブ輪４の内側転走面４ａに対向するアウター側の外側転走面２ａと、内輪５の内側転走面５ａに対向するインナー側の外側転走面２ｂが一体に形成されている。これら両転走面間に複列の転動体３、３が収容され、保持器９、１０によって転動自在に保持されている。この外方部材２はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中炭素鋼で形成され、複列の外側転走面２ａ、２ｂが高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化処理されている。そして、外方部材２と内方部材１との間に形成される環状空間の開口部にはシール１１、１２が装着され、軸受内部に封入されたグリースの外部への漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。なお、ここでは、転動体３にボールを使用した複列アンギュラ玉軸受を例示したが、これに限らず、転動体３に円錐ころを使用した複列円錐ころ軸受であっても良い。また、従動輪側の第３世代構造に限らず、第１および第２世代、あるいは第４世代構造であっても良い。   The outer member 2 integrally has a vehicle body mounting flange 2c to be attached to a knuckle (not shown) on the outer periphery, and the outer side outer rolling facing the inner rolling surface 4a of the hub wheel 4 on the inner periphery. The surface 2a and the inner side outer rolling surface 2b facing the inner rolling surface 5a of the inner ring 5 are integrally formed. Double-row rolling elements 3 and 3 are accommodated between these rolling surfaces and are held by the cages 9 and 10 so as to roll freely. This outer member 2 is formed of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the double row outer rolling surfaces 2a and 2b have a surface hardness in the range of 58 to 64HRC by induction hardening. Has been cured. Seals 11 and 12 are attached to the opening of the annular space formed between the outer member 2 and the inner member 1, and leakage of grease sealed inside the bearing and rainwater from the outside. And dust are prevented from entering the bearing. In addition, although the double row angular contact ball bearing which used the ball for the rolling element 3 was illustrated here, not only this but the double row tapered roller bearing which uses the tapered roller for the rolling element 3 may be sufficient. In addition, the first generation and second generation, or the fourth generation structure may be used instead of the third generation structure on the driven wheel side.

本実施形態では、アウター側の転動体３のピッチ円直径ＰＣＤｏがインナー側の転動体３のピッチ円直径ＰＣＤｉよりも大径に設定されている。そして、複列の転動体３、３のサイズは同じであるが、このピッチ円直径ＰＣＤｏ、ＰＣＤｉの違いにより、アウター側の転動体３の個数がインナー側の転動体３の個数よりも多く設定されている。   In this embodiment, the pitch circle diameter PCDo of the outer side rolling element 3 is set larger than the pitch circle diameter PCDi of the inner side rolling element 3. The sizes of the double-row rolling elements 3 and 3 are the same, but due to the difference in pitch circle diameters PCDo and PCDi, the number of outer-side rolling elements 3 is set larger than the number of inner-side rolling elements 3. Has been.

ハブ輪４の外郭形状は、内側転走面４ａの溝底部からカウンタ部１３と、このカウンタ部１３から段部７ａを介して軸方向に延びる軸状部７、および内輪５が突き合わされる肩部７ｂを介して小径段部４ｂに続いている。ハブ輪４のアウター側の端部にはすり鉢状の凹所１４が形成されている。この凹所１４の深さは内側転走面４ａの溝底付近までの深さとされ、ハブ輪４のアウター側が略均一な肉厚となっている。また、ピッチ円直径ＰＣＤｏ、ＰＣＤｉの違いに伴い、ハブ輪４の内側転走面４ａは内輪５の内側転走面５ａよりも拡径して形成され、軸状部７の外径が内側転走面５ａの溝底径と略同一径になるように設定されている。   The outer shape of the hub wheel 4 is such that the counter portion 13 from the groove bottom portion of the inner rolling surface 4a, the shaft-like portion 7 extending in the axial direction from the counter portion 13 through the step portion 7a, and the shoulder to which the inner ring 5 is abutted. It continues to the small diameter step part 4b via the part 7b. A mortar-shaped recess 14 is formed at the outer end of the hub wheel 4. The depth of the recess 14 is a depth to the vicinity of the groove bottom of the inner rolling surface 4a, and the outer side of the hub wheel 4 has a substantially uniform thickness. Further, along with the difference between the pitch circle diameters PCDo and PCDi, the inner raceway surface 4a of the hub wheel 4 is formed to have a larger diameter than the inner raceway surface 5a of the inner race 5, and the outer diameter of the shaft portion 7 is inwardly rolled. The diameter is set to be substantially the same as the groove bottom diameter of the running surface 5a.

一方、外方部材２において、ピッチ円直径ＰＣＤｏ、ＰＣＤｉの違いに伴い、アウター側の外側転走面２ａがインナー側の外側転走面２ｂよりも拡径して形成され、アウター側の外側転走面２ａから円筒状の肩部１５と段部１５ａを介して小径側の肩部１６に続き、インナー側の外側転走面２ｂに到っている。   On the other hand, in the outer member 2, the outer side outer rolling surface 2a is formed with a larger diameter than the inner side outer rolling surface 2b due to the difference in pitch circle diameters PCDo and PCDi, and the outer side outer rolling surface 2b is formed. From the running surface 2a through the cylindrical shoulder portion 15 and the step portion 15a to the shoulder portion 16 on the small diameter side, the outer rolling surface 2b on the inner side is reached.

こうした構成の車輪用軸受装置では、アウター側の転動体３のピッチ円直径ＰＣＤｏをインナー側の転動体３のピッチ円直径ＰＣＤｉよりも大径に設定され、その分、転動体３の個数もアウター側の個数がインナー側の個数よりも多く設定されているため、有効に軸受スペースを活用してインナー側に比べアウター側部分の軸受剛性を増大させることができ、軸受の長寿命化を図ることができる。さらに、ハブ輪４のアウター側端部に凹所１３が外郭形状に沿って形成され、ハブ輪４のアウター側が均一な肉厚に設定されているので、装置の軽量・コンパクト化と高剛性化という相反する課題を解決することができる。   In the wheel bearing device having such a configuration, the pitch circle diameter PCDo of the outer side rolling element 3 is set larger than the pitch circle diameter PCDi of the inner side rolling element 3, and the number of the rolling elements 3 is also increased accordingly. Since the number of sides is set to be larger than the number of inner sides, it is possible to effectively utilize the bearing space and increase the bearing rigidity of the outer side portion compared to the inner side, thereby extending the life of the bearing. Can do. Furthermore, since the recess 13 is formed along the outer shape at the outer end of the hub wheel 4 and the outer side of the hub wheel 4 is set to a uniform thickness, the device is lighter, more compact and more rigid. It is possible to solve the conflicting problem.

ここで、左右軸受列の内部空間容積比に比例したグリース封入量に設定されている。すなわち、アウター側の全空間容積に対して４０〜６０％、好ましくは、４５〜５５％の範囲のグリースがアウター側の軸受列に封入されると共に、インナー側の全空間容積に対しても４０〜６０％、好ましくは、４５〜５５％の範囲のグリースがインナー側の軸受列に封入されている。さらに、封入されるグリースの左右重量バラツキが±２０％以内になるように規制されている。なお、アウター側およびインナー側の全空間容積とは、複列の転動体３、３のピッチ中心からアウター側のシール１１およびインナー側のシール１２のそれぞれ軸受内方側までの全空間容積を言う。   Here, the amount of grease filled is proportional to the internal space volume ratio of the left and right bearing rows. That is, grease in the range of 40 to 60%, preferably 45 to 55% with respect to the outer side total space volume is enclosed in the outer side bearing row and 40% with respect to the inner side total space volume. ~ 60%, preferably 45 to 55% of grease is enclosed in the inner bearing row. Furthermore, the right and left weight variation of the grease to be enclosed is regulated to be within ± 20%. The total space volume on the outer side and the inner side means the total space volume from the center of the pitch of the double row rolling elements 3 and 3 to the bearing inner side of each of the outer seal 11 and the inner seal 12. .

グリース封入に際しては、図２に示すように、予め複列の転動体３、３を保持器９、１０で保持し、これらのボールカセットを外方部材２に内嵌させた状態で、グリース封入治具１７を内挿（図中矢印方向）させてグリースを封入している。すなわち、グリース封入治具１７の放射方向に突設された左右複数本のノズル１７ａ、１７ｂをボールカセットに対峙させ、所定量のグリースを封入している。   As shown in FIG. 2, the grease is filled in a state where the double-row rolling elements 3 and 3 are held in advance by the cages 9 and 10 and these ball cassettes are fitted in the outer member 2 as shown in FIG. The jig 17 is inserted (in the direction of the arrow in the figure) to enclose the grease. That is, a plurality of left and right nozzles 17a, 17b protruding in the radial direction of the grease sealing jig 17 are opposed to the ball cassette, and a predetermined amount of grease is sealed.

ここでは、ピッチ円直径ＰＣＤｏが大径となるアウター側の軸受列に対峙するノズル１７ｂの口径ｄｏが、インナー側の軸受列に対峙するノズル１７ａの口径ｄｉよりも大きく、その面積比率が、左右列の軸受内部空間容積比になるように設定されている。これにより、それぞれ複列の転動体３、３のピッチ円直径ＰＣＤｏ、ＰＣＤｉが異なり、左右列の軸受内部空間容積が異なっていても、最適なグリース封入量を確保することができる。したがって、運転中におけるグリース漏れの発生や回転トルクが増大すると言った不具合を解消することができる。   Here, the diameter do of the nozzle 17b facing the outer bearing row where the pitch circle diameter PCDo is large is larger than the diameter di of the nozzle 17a facing the inner bearing row, and the area ratio is It is set to be the bearing internal space volume ratio of the row. As a result, even when the pitch circle diameters PCDo and PCDi of the double-row rolling elements 3 and 3 are different, and the bearing internal space volumes of the left and right rows are different, an optimal amount of grease can be secured. Therefore, it is possible to eliminate the problem that grease leakage occurs during operation and the rotational torque increases.

なお、本実施形態では、アウター側とインナー側のノズル１７ａ、１７ｂの口径ｄｏ、ｄｉを変更して、それぞれ所定量のグリースを封入するようにしたが、これに限らず、例えば、図示はしないが、アウター側とインナー側のノズル１７ａ、１７ｂの本数を変更してグリース封入量を調整するようにしても良い。   In the present embodiment, the diameters do and di of the outer side and inner side nozzles 17a and 17b are changed to enclose a predetermined amount of grease, but the present invention is not limited to this. However, the grease filling amount may be adjusted by changing the number of the outer side and inner side nozzles 17a, 17b.

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

本発明に係る車輪用軸受装置は、駆動輪用、従動輪用に拘わらず、第１乃至第４世代構造の車輪用軸受装置に適用することができる。   The wheel bearing device according to the present invention can be applied to a wheel bearing device having a first to fourth generation structure regardless of whether it is for driving wheels or driven wheels.

本発明に係る車輪用軸受装置の一実施形態を示す縦断面図である。It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. 図１の車輪用軸受装置のグリース封入工程を示す説明図である。It is explanatory drawing which shows the grease enclosure process of the wheel bearing apparatus of FIG. 従来の車輪用軸受装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. 同上、グリース封入工程を示す説明図である。It is explanatory drawing which shows a grease enclosure process same as the above.

符号の説明Explanation of symbols

１・・・・・・・・・内方部材
２・・・・・・・・・外方部材
３・・・・・・・・・転動体
４・・・・・・・・・ハブ輪
４ａ、５ａ・・・・・内側転走面
４ｂ・・・・・・・・小径段部
５・・・・・・・・・内輪
６・・・・・・・・・車輪取付フランジ
６ａ・・・・・・・・ハブボルト
６ｂ・・・・・・・・円孔
６ｃ・・・・・・・・基部
７・・・・・・・・・軸状部
７ａ、１５ａ・・・・段部
７ｂ、１５、１６・・肩部
８・・・・・・・・・加締部
９、１０・・・・・・保持器
１１、１２・・・・・シール
１３・・・・・・・・カウンタ部
１４・・・・・・・・凹所
１７・・・・・・・・グリース封入治具
１７ａ、１７ｂ・・・ノズル
５０・・・・・・・・車輪用軸受装置
５１・・・・・・・・外方部材
５１ａ・・・・・・・アウター側の外側転走面
５１ｂ・・・・・・・インナー側の外側転走面
５１ｃ・・・・・・・車体取付フランジ
５２・・・・・・・・ハブ輪
５２ａ、５４ａ・・・内側転走面
５２ｂ・・・・・・・小径段部
５２ｃ・・・・・・・加締部
５３・・・・・・・・車輪取付フランジ
５４・・・・・・・・内輪
５５・・・・・・・・内方部材
５６、５７・・・・・ボール
５８、５９・・・・・保持器
６０、６１・・・・・シール
６２・・・・・・・・グリース封入治具
６２ａ、６２ｂ・・・ノズル
Ｄ１・・・・・・・・アウター側のボールのピッチ円直径
Ｄ２・・・・・・・・インナー側のボールのピッチ円直径
ｄｉ、ｄｏ・・・・・ノズルの口径
ＰＣＤｉ・・・・・・インナー側のボールのピッチ円直径
ＰＣＤｏ・・・・・・アウター側のボールのピッチ円直径 1 ... Inner member 2 ... Outer member 3 ... Rolling element 4 ... Hub wheel 4a, 5a ... Inner rolling surface 4b ... Small diameter step 5 ... Inner ring 6 ... Wheel mounting flange 6a ················································ 6 7b, 15,16 ... Shoulder 8 ... Clamping part 9,10 ... Cage 11,12 ... Seal 13 ... ················································································ Grease filling jigs 17a, 17b .... Outer member 51a ... On the outer side Side rolling surface 51b ... Outer side rolling surface 51c on the inner side ... Body mounting flange 52 ... Hub wheels 52a, 54a ... Inside rolling Surface 52b ... Small diameter step 52c ... Clamping part 53 ... Wheel mounting flange 54 ... Inner ring 55 ... ..... Inward members 56, 57 ... Balls 58, 59 ... Retainer 60, 61 ... Seal 62 ...... Grease filling jig 62a, 62b... Nozzle D1... Pitch pitch diameter D2 of outer side ball... Pitch pitch diameter di of inner side ball di, do. PCDi ... Pitch circle diameter of inner side ball PCDo ... Pitch circle diameter of outer side ball

Claims (4)

内周に複列の外側転走面が形成された外方部材と、
外周に前記複列の外側転走面に対向する複列の内側転走面が設けられた内方部材と、
この内方部材と前記外方部材の両転走面間に転動自在に収容された複列の転動体とを備えた車輪用軸受装置において、
前記複列の転動体のうちアウター側の転動体のピッチ円直径がインナー側の転動体のピッチ円直径よりも大径に設定されると共に、前記左右軸受列に封入されるグリース量が、当該左右軸受列の内部空間容積比に比例して設定されていることを特徴とする車輪用軸受装置。 An outer member having a double row outer raceway formed on the inner periphery;
An inner member provided on the outer periphery with a double-row inner rolling surface facing the double-row outer rolling surface;
In the wheel bearing device including the inner member and a double-row rolling element that is accommodated in a freely rolling manner between both rolling surfaces of the outer member,
The pitch circle diameter of the outer side rolling elements of the double row rolling elements is set larger than the pitch circle diameter of the inner side rolling elements, and the amount of grease enclosed in the left and right bearing rows is A wheel bearing device, characterized in that it is set in proportion to the internal space volume ratio of the left and right bearing rows. 前記左右軸受列のグリース封入量が、当該左右軸受列の内部空間容積の４０〜６０％の範囲に設定されている請求項１に記載の車輪用軸受装置。   2. The wheel bearing device according to claim 1, wherein a grease filling amount of the left and right bearing rows is set in a range of 40 to 60% of an internal space volume of the left and right bearing rows. 前記複列の転動体のサイズが同じで、前記アウター側の転動体の個数が前記インナー側の転動体の個数よりも多く設定されている請求項１または２に記載の車輪用軸受装置。   The wheel bearing device according to claim 1 or 2, wherein the size of the double-row rolling elements is the same, and the number of the outer-side rolling elements is set larger than the number of the inner-side rolling elements. 前記内方部材が、外周に前記複列の外側転走面に対向する一方の内側転走面と、この内側転走面から軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、外周に前記複列の外側転走面に対向する他方の内側転走面が形成された内輪からなると共に、前記ハブ輪のアウター側の端部にすり鉢状の凹所が形成され、この凹所の深さが少なくとも前記ハブ輪の内側転走面の溝底付近とされ、前記ハブ輪の外郭形状が当該凹所に対応して略均一な肉厚となるように形成されている請求項１乃至３いずれかに記載の車輪用軸受装置。   A hub wheel in which the inner member is formed with one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a small diameter step portion extending in an axial direction from the inner rolling surface, and the hub The inner ring is press-fitted into the small-diameter step of the ring and the other inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery, and a mortar-like shape is formed on the outer end of the hub wheel. A recess is formed, and the depth of the recess is at least near the groove bottom of the inner raceway surface of the hub wheel, and the outer shape of the hub wheel has a substantially uniform thickness corresponding to the recess. The wheel bearing device according to any one of claims 1 to 3, wherein the wheel bearing device is formed as described above.
JP2006233059A 2006-08-17 2006-08-30 Wheel bearing device Pending JP2008057596A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2006233059A JP2008057596A (en) 2006-08-30 2006-08-30 Wheel bearing device
CN200780030330.3A CN101505975B (en) 2006-08-17 2007-08-13 Bearing device for wheel
DE112007001917.4T DE112007001917B4 (en) 2006-08-17 2007-08-13 wheel bearing device
PCT/JP2007/000876 WO2008020496A1 (en) 2006-08-17 2007-08-13 Bearing device for wheel
US12/371,685 US7651275B2 (en) 2006-08-17 2009-02-16 Wheel bearing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006233059A JP2008057596A (en) 2006-08-30 2006-08-30 Wheel bearing device

Related Child Applications (1)

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JP2010166008A Division JP5030187B2 (en) 2010-07-23 2010-07-23 Grease filling method for wheel bearing device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108197400A (en) * 2018-01-12 2018-06-22 上海理工大学 A kind of hardness field adaptation design method of engineering machinery thrust wheel wheel body and Chain Link

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11182537A (en) * 1997-12-17 1999-07-06 Nippon Seiko Kk Rolling bearing unit for wheel
JP2004108449A (en) * 2002-09-17 2004-04-08 Koyo Seiko Co Ltd Rolling bearing device
JP2004345439A (en) * 2003-05-21 2004-12-09 Honda Motor Co Ltd Wheel supporting hub unit
JP2005081856A (en) * 2003-09-04 2005-03-31 Koyo Seiko Co Ltd Rolling bearing device
JP2005314459A (en) * 2004-04-27 2005-11-10 Nsk Ltd Grease composition and hub unit bearing for vehicle using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11182537A (en) * 1997-12-17 1999-07-06 Nippon Seiko Kk Rolling bearing unit for wheel
JP2004108449A (en) * 2002-09-17 2004-04-08 Koyo Seiko Co Ltd Rolling bearing device
JP2004345439A (en) * 2003-05-21 2004-12-09 Honda Motor Co Ltd Wheel supporting hub unit
JP2005081856A (en) * 2003-09-04 2005-03-31 Koyo Seiko Co Ltd Rolling bearing device
JP2005314459A (en) * 2004-04-27 2005-11-10 Nsk Ltd Grease composition and hub unit bearing for vehicle using the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108197400A (en) * 2018-01-12 2018-06-22 上海理工大学 A kind of hardness field adaptation design method of engineering machinery thrust wheel wheel body and Chain Link
CN108197400B (en) * 2018-01-12 2021-03-26 上海理工大学 Hardness field matching design method for wheel body and caterpillar track joint of thrust wheel of engineering machinery

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