JP5116131B2 - Drive wheel bearing device - Google Patents

Drive wheel bearing device Download PDF

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JP5116131B2
JP5116131B2 JP2005267470A JP2005267470A JP5116131B2 JP 5116131 B2 JP5116131 B2 JP 5116131B2 JP 2005267470 A JP2005267470 A JP 2005267470A JP 2005267470 A JP2005267470 A JP 2005267470A JP 5116131 B2 JP5116131 B2 JP 5116131B2
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wheel
shoulder
rolling
axial direction
hub wheel
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JP2007076524A (en
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孝幸 乗松
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NTN Corp
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NTN Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • F16C35/0635—Fixing them on the shaft the bore of the inner ring being of special non-cylindrical shape which co-operates with a complementary shape on the shaft, e.g. teeth, polygonal sections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F16C19/527—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to vibration and noise
    • 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

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

Description

本発明は、自動車等の車両の駆動車輪を支持する駆動車輪用軸受装置、詳しくは、車輪用軸受と等速自在継手とを備え、独立懸架式サスペンションに装着された駆動輪（ＦＦ車の前輪、ＦＲ車あるいはＲＲ車の後輪、および４ＷＤ車の全輪）を懸架装置に対して回転自在に支持する駆動車輪用軸受装置に関するものである。   The present invention relates to a drive wheel bearing device that supports a drive wheel of a vehicle such as an automobile, and more specifically, a drive wheel (front wheel of an FF vehicle) that includes a wheel bearing and a constant velocity universal joint and is mounted on an independent suspension. , A rear wheel of an FR vehicle or an RR vehicle, and all wheels of a 4WD vehicle).

自動車等の車両のエンジン動力を車輪に伝達する動力伝達装置は、エンジンから車輪へ動力を伝達すると共に、悪路走行時における車両のバウンドや車両の旋回時に生じる車輪からの径方向や軸方向変位、およびモーメント変位を許容する必要があるため、例えば、エンジン側と駆動車輪側との間に介装されるドライブシャフトの一端が摺動型の等速自在継手を介してディファレンシャルに連結され、他端が固定型の等速自在継手を含む駆動車輪用軸受装置を介して駆動輪に連結されている。   A power transmission device that transmits engine power of a vehicle such as an automobile to a wheel transmits power from the engine to the wheel, and also causes radial or axial displacement from the wheel that occurs when the vehicle bounces or turns when traveling on a rough road. For example, one end of the drive shaft interposed between the engine side and the drive wheel side is connected to the differential through a sliding type constant velocity universal joint, and the like. The end is connected to the drive wheel via a drive wheel bearing device including a fixed type constant velocity universal joint.

この駆動車輪用軸受装置として従来から種々の構造のものが提案されているが、例えば図３に示すようなものが知られている。この駆動車輪用軸受装置５０は、駆動輪（図示せず）を一端部に装着するハブ輪５１と、このハブ輪５１を回転自在に支承する複列の転がり軸受５２、およびハブ輪５１に連結され、ドライブシャフト（図示せず）の動力をハブ輪５１に伝達する固定型の等速自在継手５３を備えている。   Various types of drive wheel bearing devices have been proposed in the past. For example, a device as shown in FIG. 3 is known. This drive wheel bearing device 50 is connected to a hub wheel 51 for mounting a drive wheel (not shown) at one end thereof, a double row rolling bearing 52 for rotatably supporting the hub wheel 51, and the hub wheel 51. In addition, a fixed type constant velocity universal joint 53 that transmits power of a drive shaft (not shown) to the hub wheel 51 is provided.

ハブ輪５１は、一端部に駆動輪を取り付けるための車輪取付フランジ５４を一体に有し、外周に内側転走面５１ａと、この内側転走面５１ａから軸方向に延びる円筒状の小径段部５１ｂが形成されている。複列の転がり軸受５２は、外周に懸架装置（図示せず）に固定される車体取付フランジ５５ｂを一体に有し、内周に複列の外側転走面５５ａ、５５ａが形成された外方部材５５と、この外方部材５５に複列のボール５６、５６を介して内挿される内方部材５７とからなる。   The hub wheel 51 integrally has a wheel mounting flange 54 for mounting a drive wheel at one end, an inner rolling surface 51a on the outer periphery, and a cylindrical small-diameter step portion extending in the axial direction from the inner rolling surface 51a. 51b is formed. The double-row rolling bearing 52 has a vehicle body mounting flange 55b integrally fixed to a suspension device (not shown) on the outer periphery, and an outer side in which double-row outer rolling surfaces 55a and 55a are formed on the inner periphery. It comprises a member 55 and an inner member 57 inserted into the outer member 55 via double rows of balls 56.

内方部材５７は、ハブ輪５１と、このハブ輪５１の小径段部５１ｂに圧入され、外周に内側転走面５８ａが形成された別体の内輪５８とからなる。そして、ハブ輪５１の小径段部５１ｂの端部を径方向外方に塑性変形させて形成した加締部５１ｃにより、ハブ輪５１に対して内輪５８が軸方向に固定されている。   The inner member 57 includes a hub wheel 51 and a separate inner ring 58 that is press-fitted into the small-diameter step portion 51b of the hub wheel 51 and has an inner rolling surface 58a formed on the outer periphery. The inner ring 58 is fixed to the hub wheel 51 in the axial direction by a caulking portion 51 c formed by plastically deforming the end portion of the small-diameter stepped portion 51 b of the hub wheel 51 radially outward.

等速自在継手５３は、カップ状のマウス部５９と、このマウス部５９の底部をなす肩部６０と、この肩部６０から軸方向に延びる軸部６１とを一体に有する外側継手部材６２を備えている。そして、ハブ輪５１にこの外側継手部材６２がトルク伝達可能に内嵌されている。すなわち、ハブ輪５１の内周に雌セレーション６３が形成されると共に、外側継手部材６２の軸部６１の外周に雄セレーション６４が形成され、両セレーション６３、６４が噛合されている。そして、ハブ輪５１の加締部５１ｃに肩部６０が突き合わされるまで外側継手部材６２の軸部６１がハブ輪５１に内嵌されると共に、軸部６１の端部に形成された雄ねじ６５に固定ナット６６が所定の締め付けトルクで締結され、ハブ輪５１と外側継手部材６２とが軸方向に分離可能に結合されている。   The constant velocity universal joint 53 includes an outer joint member 62 integrally including a cup-shaped mouth portion 59, a shoulder portion 60 that forms the bottom of the mouth portion 59, and a shaft portion 61 that extends from the shoulder portion 60 in the axial direction. I have. The outer joint member 62 is fitted into the hub wheel 51 so that torque can be transmitted. That is, the female serration 63 is formed on the inner periphery of the hub wheel 51, and the male serration 64 is formed on the outer periphery of the shaft portion 61 of the outer joint member 62, and both the serrations 63 and 64 are engaged with each other. The shaft portion 61 of the outer joint member 62 is fitted into the hub wheel 51 until the shoulder portion 60 is abutted against the caulking portion 51 c of the hub wheel 51, and the male screw 65 formed at the end of the shaft portion 61. The fixing nut 66 is fastened with a predetermined tightening torque, and the hub wheel 51 and the outer joint member 62 are coupled so as to be separable in the axial direction.

こうした車両の駆動輪には、エンジン低速回転時、例えば車両発進時に、エンジンから摺動型の等速自在継手（図示せず）を介して大きなトルクが負荷され、ドライブシャフトに捩じれが生じることが知られている。その結果、このドライブシャフトを支持する複列の転がり軸受５２の内方部材５７にも捩じれが生じることになる。このようにドライブシャフトに大きな捩じれが発生した場合、ハブ輪５１の雌セレーション６３と、ハブ輪５１に内嵌された軸部６１の雄セレーション６４との間に周方向のすきまがあれば、外側継手部材６２と内方部材５７との当接面で急激なスリップによるスティックスリップ音が発生する。   A large torque is applied to the drive wheels of such a vehicle from the engine via a sliding type constant velocity universal joint (not shown) when the engine rotates at a low speed, for example, when the vehicle starts, and the drive shaft may be twisted. Are known. As a result, the inner member 57 of the double row rolling bearing 52 that supports the drive shaft is also twisted. When a large twist occurs in the drive shaft in this way, if there is a circumferential clearance between the female serration 63 of the hub wheel 51 and the male serration 64 of the shaft portion 61 fitted in the hub wheel 51, the outer side A stick-slip sound due to a sudden slip is generated on the contact surface between the joint member 62 and the inner member 57.

この対策手段として、従来の駆動車輪用軸受装置５０において、外側継手部材６２の肩部６０と当接する部分、すなわち、ハブ輪５１の加締部５１ｃが平坦面に形成されている。これにより、加締部５１ｃと肩部６０とが面接触し、固定ナット６６の緊締力に基いて加締部５１ｃに加えられる面圧を小さくすることができ、加締部５１ｃの塑性変形と固定ナット６６の弛みを防止すると共に、肩部６０と加締部５１ｃとの当接面で急激なスリップによるスティックスリップ音が発生するのを防止することができる。
特開平１１−５４０４号公報 As a countermeasure, in the conventional drive wheel bearing device 50, a portion that contacts the shoulder 60 of the outer joint member 62, that is, a caulking portion 51c of the hub wheel 51 is formed on a flat surface. As a result, the caulking portion 51c and the shoulder portion 60 are in surface contact with each other, and the surface pressure applied to the caulking portion 51c based on the tightening force of the fixing nut 66 can be reduced, and the plastic deformation of the caulking portion 51c can be reduced. It is possible to prevent loosening of the fixing nut 66 and to prevent the occurrence of stick-slip noise due to sudden slip on the contact surface between the shoulder portion 60 and the caulking portion 51c.
Japanese Patent Laid-Open No. 11-5404

この従来の駆動車輪用軸受装置は、ハブ輪５１の加締部５１ｃが平坦面に形成されているため、加締部５１ｃと肩部６０とが面接触し、固定ナット６６の緊締力に基いて加締部５１ｃに加えられる面圧を小さくでき、加締部５１ｃの塑性変形と固定ナット６６の弛みを防止すると共に、肩部６０と加締部５１ｃとの当接面で急激なスリップによるスティックスリップ音が発生するのを防止することができる特徴を備えている。しかしながら、加締部５１ｃが平坦面に形成されるだけでは、この加締部５１ｃと肩部６０とが面接触する保証は必ずしもない。すなわち、加締部５１ｃを平坦面に形成したとしても、肩部６０における当接面６０ａの精度如何によっては両者がエッジで接触し、反って接触面圧が大きくなる恐れがあった。   In this conventional drive wheel bearing device, since the caulking portion 51c of the hub wheel 51 is formed on a flat surface, the caulking portion 51c and the shoulder portion 60 are in surface contact, and based on the tightening force of the fixing nut 66. Thus, the surface pressure applied to the caulking portion 51c can be reduced, the plastic deformation of the caulking portion 51c and the loosening of the fixing nut 66 are prevented, and the contact surface between the shoulder portion 60 and the caulking portion 51c is caused by a sudden slip. It has a feature that can prevent the occurrence of stick-slip noise. However, simply forming the crimped portion 51c on a flat surface does not necessarily guarantee that the crimped portion 51c and the shoulder 60 are in surface contact. That is, even if the caulking portion 51c is formed on a flat surface, depending on the accuracy of the contact surface 60a in the shoulder portion 60, the two contact with each other at the edge, and the contact surface pressure may be increased.

本発明は、このような事情に鑑みてなされたもので、加締部と肩部との接触面圧を小さくし、スティックスリップ音の発生を防止すると共に、加締部のフレッティングを抑制した駆動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 the contact surface pressure between the crimping portion and the shoulder portion is reduced to prevent the occurrence of stick-slip noise and to suppress fretting of the crimping portion. It aims at providing the bearing apparatus for drive wheels.

係る目的を達成すべく、本発明のうち請求項１に記載の発明は、内周に複列の外側転走面が形成された外方部材と、一端部に車輪取付フランジを一体に有し、外周に軸方向に延びる円筒状の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た少なくとも一つの内輪からなり、前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、前記両転走面間に転動自在に収容された複列の転動体と、等速自在継手を構成する外側継手部材とを備え、この外側継手部材が、カップ状のマウス部と、このマウス部の底部をなす肩部と、この肩部から軸方向に延びるステム部とを一体に有し、このステム部が前記ハブ輪にセレーションを介してトルク伝達可能に内嵌されると共に、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軸方向に固定され、前記加締部が前記肩部と突き合わせ状態で、前記外側継手部材がねじ手段を介して前記ハブ輪に軸方向に分離可能に結合された駆動車輪用軸受装置において、前記加締部が未焼入れ部とされ、その内端面が平坦面に形成され、前記肩部の端面と全面当りして面圧を小さくすると共に、前記肩部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、当接面が切削加工または研削加工によって形成され、この当接面の直角度が、前記ステム部に対して１００μｍ内に、平面度が５０μｍ内になるように規制されている。
In order to achieve such an object, the invention according to claim 1 of the present invention integrally has an outer member having a double row outer rolling surface formed on the inner periphery and a wheel mounting flange at one end. A hub ring having a cylindrical small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring, and facing the outer rolling surface of the double row An inner member formed with a double row inner rolling surface, a double row rolling element housed in a freely rolling manner between the two rolling surfaces, and an outer joint member constituting a constant velocity universal joint The outer joint member integrally has a cup-shaped mouth portion, a shoulder portion forming the bottom portion of the mouth portion, and a stem portion extending in the axial direction from the shoulder portion, and the stem portion is attached to the hub wheel. It is fitted so that torque can be transmitted through serrations, and the end of the small diameter step is radially outward. The inner ring is fixed in the axial direction by a caulking portion formed by plastic deformation, and the outer joint member is axially separated from the hub wheel via screw means while the caulking portion is in contact with the shoulder portion. in coupled to a drive wheel bearing device, the caulking portion is a non-quenched portions, the inner end face thereof is formed into a flat surface, reduced to Rutotomoni the surface pressure by the end surface and the entire surface per said shoulder The shoulder portion is hardened by induction hardening to a surface hardness of 58 to 64 HRC , the contact surface is formed by cutting or grinding, and the perpendicularity of the contact surface is set to the stem portion. The flatness is regulated to be within 50 μm within 100 μm.

このように、内周に複列の外側転走面が形成された外方部材と、一端部に車輪取付フランジを一体に有し、外周に軸方向に延びる円筒状の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た少なくとも一つの内輪からなり、複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、両転走面間に転動自在に収容された複列の転動体と、等速自在継手を構成する外側継手部材とを備え、この外側継手部材が、カップ状のマウス部と、このマウス部の底部をなす肩部と、この肩部から軸方向に延びるステム部とを一体に有し、このステム部が前記ハブ輪にセレーションを介してトルク伝達可能に内嵌されると共に、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内輪が軸方向に固定され、加締部が肩部と突き合わせ状態で、外側継手部材がねじ手段を介してハブ輪に軸方向に分離可能に結合された駆動車輪用軸受装置において、加締部が未焼入れ部とされ、その内端面が平坦面に形成され、肩部の端面と全面当りして面圧を小さくすると共に、肩部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、当接面が切削加工または研削加工によって形成され、この当接面の直角度が、ステム部に対して１００μｍ内に、平面度が５０μｍ内になるように規制されているので、肩部と加締部との当接面で急激なスリップによるスティックスリップ音が発生するのを防止することができる。さらに、肩部に比べ低硬度の加締部のフレッティングを抑制して耐久性を向上させることができる。
Thus, an outer member having a double row outer raceway formed on the inner periphery and a cylindrical small-diameter stepped portion extending in the axial direction on the outer periphery are integrally formed with the wheel mounting flange at one end. An inner member formed with a double-row inner rolling surface opposite to the double-row outer rolling surface, and an inner member formed of at least one inner ring press-fitted into a small-diameter step portion of the hub wheel, A double-row rolling element accommodated between the rolling surfaces, and an outer joint member constituting a constant velocity universal joint. The outer joint member includes a cup-shaped mouth portion and the mouth portion. A shoulder portion forming a bottom portion and a stem portion extending in the axial direction from the shoulder portion are integrally formed, and the stem portion is internally fitted to the hub wheel so that torque can be transmitted via serrations, and a small diameter step portion is provided. The inner ring is fixed in the axial direction by a crimped part formed by plastically deforming the end radially outward. In the drive wheel bearing device in which the caulking portion is in contact with the shoulder portion and the outer joint member is axially separably coupled to the hub wheel via the screw means, the caulking portion is an unquenched portion. formed on the inner end face flat surfaces, the shoulder portion of the end surface and the entire surface per to be smaller surface pressure Rutotomoni, shoulder is hardened surface hardness in the range of 58~64HRC by induction hardening, the abutment surface formed by cutting or grinding, perpendicularity of the contact surface, within 100μm relative to the stem portion, since it is regulated so flatness is within 50 [mu] m, the shoulder portion and the caulking portion It is possible to prevent the occurrence of stick-slip noise due to sudden slip on the contact surface. Furthermore, durability can be improved by suppressing fretting of the caulking portion having a lower hardness than the shoulder portion.

また、請求項２に記載の発明のように、前記複列の内側転走面のうち、アウター側の内側転走面が前記ハブ輪に直接形成されていれば、ハブ輪の剛性を高めると共に、軽量・コンパクト化を図ることができる。
Moreover, if the outer side inner side rolling surface is directly formed in the said hub ring among the double row inner side rolling surfaces like the invention of Claim 2 , while improving the rigidity of a hub ring, It is possible to reduce the weight and size.

本発明に係る駆動車輪用軸受装置は、内周に複列の外側転走面が形成された外方部材と、一端部に車輪取付フランジを一体に有し、外周に軸方向に延びる円筒状の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た少なくとも一つの内輪からなり、前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、前記両転走面間に転動自在に収容された複列の転動体と、等速自在継手を構成する外側継手部材とを備え、この外側継手部材が、カップ状のマウス部と、このマウス部の底部をなす肩部と、この肩部から軸方向に延びるステム部とを一体に有し、このステム部が前記ハブ輪にセレーションを介してトルク伝達可能に内嵌されると共に、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軸方向に固定され、前記加締部が前記肩部と突き合わせ状態で、前記外側継手部材がねじ手段を介して前記ハブ輪に軸方向に分離可能に結合された駆動車輪用軸受装置において、前記加締部が未焼入れ部とされ、その内端面が平坦面に形成され、前記肩部の端面と全面当りして面圧を小さくすると共に、前記肩部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、当接面が切削加工または研削加工によって形成され、この当接面の直角度が、前記ステム部に対して１００μｍ内に、平面度が５０μｍ内になるように規制されているので、肩部と加締部との当接面で急激なスリップによるスティックスリップ音が発生するのを防止することができる。さらに、肩部に比べ低硬度の加締部のフレッティングを抑制して耐久性を向上させることができる。
The bearing device for a drive wheel according to the present invention has an outer member in which a double row outer rolling surface is formed on the inner periphery, a wheel mounting flange at one end, and a cylindrical shape that extends in the axial direction on the outer periphery. A hub ring formed with a small diameter step portion, and at least one inner ring press-fitted into the small diameter step portion of the hub ring, forming a double row inner rolling surface facing the double row outer rolling surface. An inner member, a double-row rolling element accommodated between the rolling surfaces, and an outer joint member constituting a constant velocity universal joint. The outer joint member is cup-shaped. The mouse part, a shoulder part that forms the bottom part of the mouse part, and a stem part that extends in the axial direction from the shoulder part are integrated, and the stem part is capable of transmitting torque to the hub wheel via serrations. In addition to being fitted, the end of the small-diameter stepped portion is formed by plastic deformation radially outward. A driving wheel in which the inner ring is fixed in the axial direction by a fastening part, the caulking part is in contact with the shoulder part, and the outer joint member is coupled to the hub wheel in an axially separable manner through screw means. in use the bearing device, the caulking portion is a non-quenched portions, the inner end face thereof is formed into a flat surface, the shoulder portion of the end surface and the entire surface per reduce the surface pressure to Rutotomoni, the shoulders induction hardening The surface hardness is hardened in the range of 58 to 64 HRC , the contact surface is formed by cutting or grinding, and the perpendicularity of the contact surface is within 100 μm with respect to the stem portion, and the flatness is Since it is regulated to be within 50 μm, it is possible to prevent the occurrence of stick-slip noise due to a sudden slip on the contact surface between the shoulder and the crimping portion. Furthermore, durability can be improved by suppressing fretting of the caulking portion having a lower hardness than the shoulder portion.

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円筒状の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、前記両転走面間に転動自在に収容された複列の転動体と、等速自在継手を構成する外側継手部材とを備え、この外側継手部材が、カップ状のマウス部と、このマウス部の底部をなす肩部と、この肩部から軸方向に延びるステム部とを一体に有し、このステム部が前記ハブ輪にセレーションを介してトルク伝達可能に内嵌されると共に、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軸方向に固定され、前記加締部が前記肩部と突き合わせ状態で、前記外側継手部材がねじ手段を介して前記ハブ輪に軸方向に分離可能に結合された駆動車輪用軸受装置において、前記加締部が未焼入れ部とされ、その内端面が平坦面に形成され、前記肩部の端面と全面当りして面圧を小さくすると共に、前記肩部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、当接面が切削加工または研削加工によって形成され、この当接面の直角度が、前記ステム部に対して１００μｍ以下に、平面度が５０μｍ以下になるように規制されている。 An outer member having a double row outer raceway formed on the inner circumference, and a wheel mounting flange at one end, and one inner raceway facing the double row outer raceway on the outer circumference. A hub wheel formed with a cylindrical small-diameter step portion extending in the axial direction from the inner rolling surface, and press-fitted into the small-diameter step portion of the hub wheel, and opposed to the double-row outer rolling surface on the outer periphery. An inner member formed of an inner ring on which the other inner rolling surface is formed; a double row rolling element that is rotatably accommodated between the both rolling surfaces; and an outer joint member that constitutes a constant velocity universal joint; The outer joint member integrally includes a cup-shaped mouth portion, a shoulder portion forming the bottom portion of the mouth portion, and a stem portion extending in the axial direction from the shoulder portion, and the stem portion is the hub. It is fitted to the wheel so that torque can be transmitted through serrations, and the end of the small diameter step is radially outward. The inner ring is fixed in the axial direction by a caulking portion formed by deforming, and the outer joint member is axially separated from the hub wheel via screw means while the caulking portion is in contact with the shoulder portion. in coupled to a drive wheel bearing device, the caulking portion is a non-quenched portions, the inner end face thereof is formed into a flat surface, reduced to Rutotomoni the surface pressure by the end surface and the entire surface per said shoulder The shoulder portion is hardened by induction hardening to a surface hardness of 58 to 64 HRC , the contact surface is formed by cutting or grinding, and the perpendicularity of the contact surface is set to the stem portion. The flatness is regulated to 100 μm or less and 50 μm or less.

以下、本発明の実施の形態を図面に基いて詳細に説明する。
図１は、本発明に係る駆動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の外側継手部材を示す説明図である。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。 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 drive wheel bearing device according to the present invention, and FIG. 2 is an explanatory view showing an outer joint member of FIG. 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).

この駆動車輪用軸受装置は、内方部材１と外方部材１０、および両部材１、１０間に転動自在に収容された複列の転動体（ボール）８、８とを備えている。内方部材１は、ハブ輪２と、このハブ輪２に圧入された内輪３とからなる。   This drive wheel bearing device includes an inner member 1, an outer member 10, and double-row rolling elements (balls) 8, 8 accommodated between the members 1, 10 so as to roll freely. The inner member 1 includes a hub ring 2 and an inner ring 3 press-fitted into the hub ring 2.

ハブ輪２は、アウトボード側の端部に車輪（図示せず）を取り付けるための車輪取付フランジ４を一体に有し、外周に一方（アウター側）の内側転走面２ａと、この内側転走面２ａから軸方向に延びる円筒状の小径段部２ｂが形成され、内周にトルク伝達用のセレーション（またはスプライン）５が形成されている。車輪取付フランジ４の円周等配位置には車輪を取り付けるハブボルト６が植設されている。   The hub wheel 2 integrally has a wheel mounting flange 4 for mounting a wheel (not shown) at an end portion on the outboard side, one (outer side) inner rolling surface 2a on the outer periphery, and the inner rolling surface. A cylindrical small-diameter step portion 2b extending in the axial direction from the running surface 2a is formed, and a serration (or spline) 5 for torque transmission is formed on the inner periphery. Hub bolts 6 for mounting the wheels are planted at the circumferentially equidistant positions of the wheel mounting flange 4.

ハブ輪２はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中炭素鋼で形成され、内側転走面２ａをはじめ、シール１１が摺接するシールランド部、および小径段部２ｂに亙り高周波焼入れによって表面硬さを５８〜６４ＨＲＣの範囲に硬化層が形成されている。そして、ハブ輪２の小径段部２ｂに内輪３が所定のシメシロを介して圧入され、小径段部２ｂの端部を径方向外方に塑性変形させて形成した加締部７によって、内輪３は軸方向に固定されている。なお、加締部７は鍛造後の素材硬さのままの未焼入れ部とされている。また、内輪３はＳＵＪ２等の高炭素クロム鋼で形成され、外周に他方（インナー側）の内側転走面３ａが形成されてズブ焼入れにより芯部まで５８〜６４ＨＲＣの範囲に硬化処理されている。   The hub wheel 2 is formed of medium carbon steel containing 0.40 to 0.80% by weight of carbon, such as S53C, and extends over the inner rolling surface 2a, the seal land portion in which the seal 11 is in sliding contact, and the small diameter step portion 2b. A hardened layer is formed with a surface hardness in the range of 58 to 64 HRC by induction hardening. Then, the inner ring 3 is press-fitted into the small-diameter step portion 2b of the hub wheel 2 through a predetermined squeeze and the end portion of the small-diameter step portion 2b is plastically deformed radially outward to form the inner ring 3. Is fixed in the axial direction. The caulking portion 7 is an unquenched portion with the material hardness after forging. Further, the inner ring 3 is made of high carbon chrome steel such as SUJ2, the other (inner side) inner rolling surface 3a is formed on the outer periphery, and is hardened in the range of 58 to 64 HRC to the core part by quenching. .

外方部材１０は、外周に車体（図示せず）に取り付けるための車体取付フランジ１０ｂを一体に有し、内周には前記内方部材１の内側転走面２ａ、３ａに対向する複列の外側転走面１０ａ、１０ａが形成されている。外方部材１０はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中炭素鋼で形成され、複列の外側転走面１０ａ１０ａ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、それぞれの転走面１０ａ、２ａと１０ａ、３ａ間に複列の転動体８、８が保持器９、９を介して転動自在に収容されている。また、外方部材１０の端部にはシール１１、１２が装着され、軸受内部に封入された潤滑グリースの漏洩を防止すると共に、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 outer member 10 integrally has a vehicle body mounting flange 10b for mounting to the vehicle body (not shown) on the outer periphery, and a double row facing the inner rolling surfaces 2a, 3a of the inner member 1 on the inner periphery. The outer rolling surfaces 10a and 10a are formed. The outer member 10 is made of medium carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the double row outer rolling surface 10a10a is hardened to a surface hardness of 58 to 64 HRC by induction hardening. Has been processed. And the double-row rolling elements 8 and 8 are accommodated so that rolling is possible via the holder | retainers 9 and 9 between each rolling surface 10a, 2a and 10a, 3a. Further, seals 11 and 12 are attached to the end portion of the outer member 10 to prevent leakage of the lubricating grease sealed inside the bearing and to prevent rainwater and dust from entering the bearing from the outside. ing.

なお、本実施形態では、転動体８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、例えば、転動体８に円すいころを用いた複列の円すいころ軸受であっても良い。また、ここでは、ハブ輪２の外周に一方の内側転走面２ａが直接形成された、所謂第３世代構造を例示したが、セルフリテイン構造なら良く、図示はしないが、ハブ輪の小径段部に一対の内輪が圧入された、所謂第１または第２世代構造であっても良い。   In the present embodiment, a double row angular contact ball bearing using a ball as the rolling element 8 is exemplified. However, the present invention is not limited to this. For example, a double row tapered roller bearing using a tapered roller as the rolling element 8 is provided. Also good. In addition, here, a so-called third generation structure in which one inner rolling surface 2a is directly formed on the outer periphery of the hub wheel 2 is illustrated. However, a self-retained structure may be used, and although not illustrated, the hub wheel has a small diameter step. A so-called first or second generation structure in which a pair of inner rings are press-fitted into the part may be used.

等速自在継手１３は、外側継手部材１４と継手内輪１５とケージ１６およびトルク伝達ボール１７を備えている。外側継手部材１４は、カップ状のマウス部１８と、このマウス部１８の底部をなす肩部１９と、この肩部１９から軸方向に延びるステム部２０を一体に有している。また、マウス部１８の内周および継手内輪１５の外周には軸方向に延びる曲線状のトラック溝１８ａ、１５ａがそれぞれ形成され、固定型の等速自在継手１３を構成している。外側継手部材１４はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中炭素鋼で形成され、トラック溝１８ａをはじめ、肩部１９からステム部２０の基部に亙る外周面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。   The constant velocity universal joint 13 includes an outer joint member 14, a joint inner ring 15, a cage 16 and a torque transmission ball 17. The outer joint member 14 integrally includes a cup-shaped mouth portion 18, a shoulder portion 19 that forms the bottom portion of the mouth portion 18, and a stem portion 20 that extends from the shoulder portion 19 in the axial direction. In addition, curved track grooves 18 a and 15 a extending in the axial direction are formed on the inner periphery of the mouth portion 18 and the outer periphery of the joint inner ring 15, respectively, thereby constituting a fixed type constant velocity universal joint 13. The outer joint member 14 is formed of medium carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the outer peripheral surface extending from the shoulder portion 19 to the base portion of the stem portion 20 including the track groove 18a is induction-hardened. The surface hardness is set in the range of 58 to 64 HRC.

ステム部２０は、外周にハブ輪２のセレーション５に係合するセレーション（またはスプライン）２０ａと、このセレーション２０ａの端部に雄ねじ２０ｂが形成されている。組立は、加締部７に肩部１９が衝合するまで、内方部材１にこのステム部２０が嵌挿され、加締部７と肩部１９とが突き合わせ状態で、雄ねじ２０ｂに固定ナット２１が螺合され、内方部材１と外側継手部材１４が軸方向に分離可能に締結されている。   The stem portion 20 has a serration (or spline) 20a engaged with the serration 5 of the hub wheel 2 on the outer periphery, and a male screw 20b formed at the end of the serration 20a. Assembling is performed by inserting the stem portion 20 into the inner member 1 until the shoulder portion 19 abuts with the caulking portion 7, and the caulking portion 7 and the shoulder portion 19 are in contact with each other. The inner member 1 and the outer joint member 14 are fastened so as to be separable in the axial direction.

ここで、加締部７の内端面が平坦面に形成されている。この加締部７の内端面は、塑性加工時に、平坦な加締型によって形成することも可能であるが、ここでは、加締後に旋削加工によって形成され、所定の平面度、例えば、５０μｍ以下になるように規制されている。   Here, the inner end surface of the caulking portion 7 is formed as a flat surface. The inner end face of the caulking portion 7 can be formed by a flat caulking die at the time of plastic working, but here, it is formed by turning after caulking and has a predetermined flatness, for example, 50 μm or less. It is regulated to become.

一方、肩部１９の当接面１９ａは、前述した高周波焼入れによる硬化処理後、超硬チップによる旋削加工、または、研削加工によって、所定の精度に仕上げられている。図２に示すように、この当接面１９ａの平面度が５０μｍ以下、好ましくは１０μｍ以下に規制されると共に、ステム部２０に対する直角度が１００μｍ以下、好ましくは５０μｍ以下に規制されている。これにより、加締部７の内端面と全面当りとなり、加締部７に加えられる面圧を小さくすることができ、肩部１９と加締部７との当接面で急激なスリップによるスティックスリップ音が発生するのを防止することができる。さらに、肩部１９に比べ低硬度の加締部７のフレッティングを抑制して耐久性を向上させることができる。   On the other hand, the contact surface 19a of the shoulder portion 19 is finished with a predetermined accuracy by turning or grinding with a cemented carbide chip after the above-described hardening process by induction hardening. As shown in FIG. 2, the flatness of the contact surface 19a is regulated to 50 μm or less, preferably 10 μm or less, and the perpendicularity to the stem portion 20 is regulated to 100 μm or less, preferably 50 μm or less. As a result, the entire inner end surface of the caulking portion 7 is brought into contact with the entire surface, and the surface pressure applied to the caulking portion 7 can be reduced. Slip noise can be prevented from occurring. Furthermore, the fretting of the caulking portion 7 having a lower hardness than that of the shoulder portion 19 can be suppressed and durability can be improved.

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.

本発明に係る駆動車輪用軸受装置は、ハブ輪と内輪とが揺動加締により一体化されたセルフリテイン構造の複列の転がり軸受と、等速自在継手とを備え、複列の転がり軸受と等速自在継手の外側継手部材とが、突き合わせ状態で分離可能に結合された駆動車輪用軸受装置に適用できる。   A bearing device for a driving wheel according to the present invention includes a double-row rolling bearing having a self-retained structure in which a hub ring and an inner ring are integrated by swing caulking, and a constant velocity universal joint, and includes a double-row rolling bearing. And the outer joint member of the constant velocity universal joint can be applied to a drive wheel bearing device that is detachably coupled in a butted state.

本発明に係る駆動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 cross-sectional view which shows one Embodiment of the bearing apparatus for drive wheels which concerns on this invention. 図１の外側継手部材を示す説明図である。It is explanatory drawing which shows the outer joint member of FIG. 従来の駆動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 bearing apparatus for drive wheels.

符号の説明Explanation of symbols

１・・・・・・・・・・・・・内方部材
２・・・・・・・・・・・・・ハブ輪
２ａ、３ａ・・・・・・・・・内側転走面
２ｂ・・・・・・・・・・・・小径段部
３・・・・・・・・・・・・・内輪
４・・・・・・・・・・・・・車輪取付フランジ
５、２０ａ・・・・・・・・・セレーション
６・・・・・・・・・・・・・ハブボルト
７・・・・・・・・・・・・・加締部
８・・・・・・・・・・・・・転動体
９・・・・・・・・・・・・・保持器
１０・・・・・・・・・・・・外方部材
１０ａ・・・・・・・・・・・外側転走面
１０ｂ・・・・・・・・・・・車体取付フランジ
１１、１２・・・・・・・・・シール
１３・・・・・・・・・・・・等速自在継手
１４・・・・・・・・・・・・外側継手部材
１５・・・・・・・・・・・・継手内輪
１５ａ、１８ａ・・・・・・・トラック溝
１６・・・・・・・・・・・・ケージ
１７・・・・・・・・・・・・トルク伝達ボール
１８・・・・・・・・・・・・マウス部
１９・・・・・・・・・・・・肩部
１９ａ・・・・・・・・・・・当接面
２０・・・・・・・・・・・・ステム部
２０ａ・・・・・・・・・・・セレーション
２０ｂ・・・・・・・・・・・雄ねじ
２１・・・・・・・・・・・・固定ナット
５０・・・・・・・・・・・・駆動車輪用軸受装置
５１・・・・・・・・・・・・ハブ輪
５１ａ、５８ａ・・・・・・・内側転走面
５１ｂ・・・・・・・・・・・小径段部
５１ｃ・・・・・・・・・・・加締部
５２・・・・・・・・・・・・複列の転がり軸受
５３・・・・・・・・・・・・等速自在継手
５４・・・・・・・・・・・・車輪取付フランジ
５５・・・・・・・・・・・・外方部材
５５ａ・・・・・・・・・・・外側転走面
５５ｂ・・・・・・・・・・・車体取付フランジ
５６・・・・・・・・・・・・ボール
５７・・・・・・・・・・・・内方部材
５８・・・・・・・・・・・・内輪
５９・・・・・・・・・・・・マウス部
６０・・・・・・・・・・・・肩部
６０ａ・・・・・・・・・・・当接面
６１・・・・・・・・・・・・軸部
６２・・・・・・・・・・・・外側継手部材
６３・・・・・・・・・・・・雌セレーション
６４・・・・・・・・・・・・雄セレーション
６５・・・・・・・・・・・・雄ねじ
６６・・・・・・・・・・・・固定ナット 1 ... inner member 2 ... hub wheels 2a, 3a ... inner rolling surface 2b ·········· Small diameter step 3 ·············································· Wheel mounting flanges 5 and 20a .... Serration 6 ..... Hub bolt 7 ........ Clamping section 8・ ・ ・ ・ ・ ・ Rolling element 9 ・ ・ ・ ・ ・ ・ ・ ・ Cage 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 10a ・ ・ ・ ・ ・ ・ ・ ・・ ・ Outside rolling surface 10b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flanges 11 and 12 ・ ・ ・ ・ ・ ・ ・ ・ Seal 13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Constant velocity Joint 14 ········· Outer joint member 15 ····················· In the joint 15a, 18a ... Track groove 16 ... Cage 17 ... Torque transmission ball 18 ...・ ・ ・ ・ ・ Mouse part 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder part 19a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Contact surface 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Stem portion 20a ... Serration 20b ... Male screw 21 ...・ ・ ・ ・ ・ ・ Drive wheel bearing device 51 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheels 51a, 58a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 51b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ Small diameter step part 51c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping part 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Double row rolling bearing 53 ・ ・ ・ ・ ・ ・・ Constant velocity universal joint 54 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Wheel mounting flange 55 ·········· Outside member 55a ······ Outside rolling surface 55b ··········· Body mounting flange 56 ... ball 57 ... inner member 58 ... inner ring 59 ...・ ・ ・ ・ ・ ・ ・ Mouse part 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder part 60a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Contact surface 61 ・ ・ ・ ・ ・ ・ ・ ・..Shaft part 62 ... Outer joint member 63 ... Female serration 64 ... Male serration 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Male thread 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut

Claims (2)

内周に複列の外側転走面（１０ａ）が形成された外方部材（１０）と、
一端部に車輪取付フランジ（４）を一体に有し、外周に軸方向に延びる円筒状の小径段部（２ｂ）が形成されたハブ輪（２）、およびこのハブ輪（２）の小径段部（２ｂ）に圧入された少なくとも一つの内輪（３）からなり、前記複列の外側転走面（１０ａ）に対向する複列の内側転走面（２ａ）（３ａ）が形成された内方部材（１）と、
前記両転走面間に転動自在に収容された複列の転動体（８）と、
等速自在継手（１３）を構成する外側継手部材（１４）とを備え、この外側継手部材（１４）が、カップ状のマウス部（１８）と、このマウス部（１８）の底部をなす肩部（１９）と、この肩部（１９）から軸方向に延びるステム部（２０）とを一体に有し、このステム部（２０）が前記ハブ輪（２）にセレーション（２０ａ）を介してトルク伝達可能に内嵌されると共に、前記小径段部（２ｂ）の端部を径方向外方に塑性変形させて形成した加締部（７）により前記内輪（３）が軸方向に固定され、前記加締部（７）が前記肩部（１９）と突き合わせ状態で、前記外側継手部材（１４）がねじ手段を介して前記ハブ輪（２）に軸方向に分離可能に結合された駆動車輪用軸受装置において、
前記加締部（７）が未焼入れ部とされ、その内端面が平坦面に形成され、前記肩部（１９）の端面と全面当りして面圧を小さくすると共に、前記肩部（１９）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、当接面が切削加工または研削加工によって形成され、この当接面の直角度が、前記ステム部（２０）に対して１００μｍ内に、平面度が５０μｍ内になるように規制されていることを特徴とする駆動車輪用軸受装置。 An outer member (10) having a double row outer raceway surface (10a) formed on the inner periphery;
A hub wheel (2) having a wheel mounting flange (4) integrally formed at one end and a cylindrical small-diameter step portion (2b) extending in the axial direction on the outer periphery, and a small-diameter step of the hub wheel (2) An inner race surface (2a) (3a) formed of at least one inner ring (3) press-fitted into the portion (2b) and facing the outer row (10a) of the double row. Direction member (1);
A double row rolling element (8) accommodated between the rolling surfaces in a freely rolling manner;
An outer joint member (14) constituting a constant velocity universal joint (13), and the outer joint member (14) includes a cup-shaped mouth portion (18) and a shoulder forming the bottom portion of the mouth portion (18). A portion (19) and a stem portion (20) extending in the axial direction from the shoulder portion (19) are integrally formed, and the stem portion (20) is connected to the hub wheel (2) via a serration (20a). The inner ring (3) is fixed in the axial direction by a crimping part (7) formed by being internally fitted so as to be able to transmit torque and plastically deforming the end of the small diameter step part (2b) radially outward. The outer joint member (14) is coupled to the hub wheel (2) in a separable manner in the axial direction through screw means in a state where the caulking portion (7) is in contact with the shoulder portion (19). In the wheel bearing device,
The pressure is the clamping portion (7) is not quenched portion, the inner end face thereof is formed as a flat surface, end surface and the entire surface per to be smaller surface pressure Rutotomoni of the shoulder portion (19), said shoulder (19 ) Is hardened by induction hardening in the range of 58 to 64 HRC , the contact surface is formed by cutting or grinding, and the perpendicularity of the contact surface is relative to the stem portion (20). A bearing device for a drive wheel, wherein the flatness is regulated to be within 50 μm within 100 μm. 前記複列の内側転走面（２ａ）（３ａ）のうち、アウター側の内側転走面（２ａ）が前記ハブ輪（２）に直接形成されている請求項１に記載の駆動車輪用軸受装置。
2. The drive wheel bearing according to claim 1, wherein an outer-side inner rolling surface (2 a) of the double-row inner rolling surfaces (2 a, 3 a) is directly formed on the hub wheel (2). apparatus.
JP2005267470A 2005-09-14 2005-09-14 Drive wheel bearing device Expired - Fee Related JP5116131B2 (en)

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