JP2007270868A - Bearing device for wheel - Google Patents

Bearing device for wheel Download PDF

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JP2007270868A
JP2007270868A JP2006094415A JP2006094415A JP2007270868A JP 2007270868 A JP2007270868 A JP 2007270868A JP 2006094415 A JP2006094415 A JP 2006094415A JP 2006094415 A JP2006094415 A JP 2006094415A JP 2007270868 A JP2007270868 A JP 2007270868A
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Prior art keywords
wheel
double row
joint
constant velocity
rolling
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JP2006094415A
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Japanese (ja)
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Hiroshi Kawamura
浩志 河村
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2006094415A priority Critical patent/JP2007270868A/en
Publication of JP2007270868A publication Critical patent/JP2007270868A/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
    • 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
    • F16C19/187—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 all four raceways integrated on parts other than race rings, e.g. fourth 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

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  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for wheel of fourth generation structure with reduced weight/size, in which temperature increase is suppressed to elongate the service life. <P>SOLUTION: In the bearing device for wheel of fourth generation structure, a hub wheel 1 and an outer joint member 10 are integrally and plastically joined by bulge-caulking. A constant velocity universal joint 3 is constituted of: the outer joint member 10 with track grooves 14a, 14b circumferentially twisted to an inner periphery at a predetermined angle; a joint inner ring 11 with track grooves 11a, 11b twisted in opposite directions by a predetermined angle so as to correspond to the track grooves 14a, 14b; torque transmitting balls 13 accommodated between both of the track grooves; and a cage 12 retaining the torque transmitting balls 13 to be capable of rolling. Therefore, rattling of the torque transmitting balls 13 is reduced, they are smoothly rolled to increase efficiency, and temperature rise during operation is suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、自動車等の車輪を懸架装置に対して回転自在に支承する車輪用軸受装置、詳しくは、ハブ輪と等速自在継手と複列の転がり軸受とをユニット化して軽量・コンパクト化を図ると共に、温度上昇を抑えて長寿命化を図った第４世代構造の車輪用軸受装置に関する。   The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like with respect to a suspension device, and more specifically, a hub wheel, a constant velocity universal joint, and a double row rolling bearing are unitized to reduce weight and size. The present invention relates to a fourth-generation wheel bearing device that is designed to extend the life by suppressing temperature rise.

自動車等の車輪を回転自在に支承する車輪用軸受装置は、複列の転がり軸受を単独に使用する第１世代と称される構造から、外方部材に車体取付フランジを一体に有する第２世代に進化し、さらに、車輪取付フランジを一体に有するハブ輪の外周に複列の転がり軸受の一方の内側転走面が一体に形成された第３世代、さらにはこのハブ輪に等速自在継手が一体結合され、この等速自在継手を構成する外側継手部材の外周に複列の転がり軸受の他方の内側転走面が一体に形成された第４世代のものまで開発されている。   A wheel bearing device for rotatably supporting a wheel of an automobile or the like is a second generation having a body mounting flange integrally with an outer member from a structure called a first generation that uses a double row rolling bearing alone. In addition, the third generation in which one inner rolling surface of the double row rolling bearing is integrally formed on the outer periphery of the hub ring integrally having the wheel mounting flange, and further, the constant velocity universal joint is provided on the hub ring. Have been developed to the fourth generation in which the other inner rolling surface of the double row rolling bearing is integrally formed on the outer periphery of the outer joint member constituting the constant velocity universal joint.

図４は、第４世代の車輪用軸受装置の代表的な一例である。この車輪用軸受装置は、ハブ輪５１と複列の転がり軸受５２と等速自在継手５３とをユニット化して構成されている。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。   FIG. 4 is a typical example of a fourth-generation wheel bearing device. This wheel bearing device is configured by unitizing a hub wheel 51, a double row rolling bearing 52, and a constant velocity universal joint 53. 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).

ハブ輪５１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５４を一体に有し、その円周等配位置にハブボルト５６が植設されている。また、ハブ輪５１の内周面には凹凸部５５が形成され、高周波焼入れによって表面硬さを５４〜６４ＨＲＣの範囲に硬化処理されている。   The hub wheel 51 integrally has a wheel mounting flange 54 for mounting a wheel (not shown) at an end portion on the outer side, and hub bolts 56 are implanted at circumferentially equidistant positions. Further, an uneven portion 55 is formed on the inner peripheral surface of the hub wheel 51, and the surface hardness is set to a range of 54 to 64HRC by induction hardening.

複列の転がり軸受５２は、外方部材５７と内方部材５８と複列のボール５９、５９とを備えている。外方部材５７は、外周に懸架装置（図示せず）に取り付けるための車体取付フランジ５７ｂを一体に有し、内周には複列の外側転走面５７ａ、５７ａが形成されている。一方、内方部材５８は、ハブ輪５１と、このハブ輪５１の小径段部５１ｂに突合せ状態に内嵌された外側継手部材６３とからなる。ハブ輪５１および外側継手部材６３の外周には複列の内側転走面５１ａ、６３ａがそれぞれ直接形成され、複列のボール５９、５９がこれら転走面５７ａ、５１ａと５７ａ、６３ａ間にそれぞれ収容され、保持器６０、６０で転動自在に保持されている。また、複列の転がり軸受５２の端部にはシール６１、６２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、外部からの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。   The double-row rolling bearing 52 includes an outer member 57, an inner member 58, and double-row balls 59, 59. The outer member 57 integrally has a vehicle body mounting flange 57b for mounting to a suspension device (not shown) on the outer periphery, and double row outer rolling surfaces 57a and 57a are formed on the inner periphery. On the other hand, the inner member 58 includes a hub wheel 51 and an outer joint member 63 that is fitted into the small-diameter step portion 51b of the hub wheel 51 in a butt-fit state. Double row inner rolling surfaces 51a and 63a are directly formed on the outer circumferences of the hub wheel 51 and the outer joint member 63, respectively, and double row balls 59 and 59 are respectively formed between the rolling surfaces 57a and 51a and 57a and 63a. It is accommodated and held by the cages 60 and 60 so as to be freely rollable. In addition, seals 61 and 62 are attached to the ends of the double row rolling bearing 52 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater and dust from the outside into the bearing. ing.

等速自在継手５３は、外側継手部材６３と継手内輪６４とケージ６５およびトルク伝達ボール６６とを備えている。外側継手部材６３は、カップ状のマウス部６７と、このマウス部６７の底部をなす肩部６８と、この肩部６８から軸方向に延びる中空の軸部６９を一体に有している。この軸部６９の外周には、前記ハブ輪５１の小径段部５１ｂに内嵌されるインロウ部６９ａと、このインロウ部６９ａからさらに軸方向に延びる嵌合部６９ｂが形成されている。そして、軸部６９の内径にマンドレル等の拡径治具を押し込んで嵌合部６９ｂを拡径し、嵌合部６９ｂをハブ輪５１の凹凸部５５に食い込ませて加締め、ハブ輪５１と外側継手部材６３とが一体に塑性結合されている。これにより、軽量・コンパクト化を図ると共に、大きなモーメント荷重が負荷されても結合部の緩みを長期間に亘って防止し、耐久性を向上させた車輪用軸受装置を提供することができる。
特開２００１−１８６０５号公報 The constant velocity universal joint 53 includes an outer joint member 63, a joint inner ring 64, a cage 65, and a torque transmission ball 66. The outer joint member 63 integrally includes a cup-shaped mouth portion 67, a shoulder portion 68 that forms the bottom portion of the mouth portion 67, and a hollow shaft portion 69 that extends from the shoulder portion 68 in the axial direction. Formed on the outer periphery of the shaft portion 69 are an inrow portion 69a fitted into the small diameter step portion 51b of the hub wheel 51, and a fitting portion 69b extending further in the axial direction from the inrow portion 69a. Then, a diameter expanding jig such as a mandrel is pushed into the inner diameter of the shaft portion 69 to expand the fitting portion 69b, and the fitting portion 69b is bitten into the concavo-convex portion 55 of the hub wheel 51 to be crimped. The outer joint member 63 is integrally plastically coupled. As a result, it is possible to provide a wheel bearing device that is lighter and more compact, and that prevents loosening of the coupling portion over a long period of time even when a large moment load is applied, and has improved durability.
Japanese Patent Laid-Open No. 2001-18605

この従来の車輪用軸受装置は、軸部６９の嵌合部６９ｂを拡径させてハブ輪５１の凹凸部５５に食い込ませ、ハブ輪５１と外側継手部材６３とを一体に塑性結合して軽量・コンパクト化を図っているが、こうした第４世代構造の車輪用軸受装置においては、複列の転がり軸受５２と等速自在継手５３とがユニット化されているため、相互に熱影響を及ぼして運転中に昇温し易い問題がある。この温度上昇によって複列の転がり軸受５２および等速自在継手５３内に封入された潤滑グリースの劣化が進み、装置の耐久性が低下する恐れがあった。近年、耐熱グリースの開発が進んでいるも、装置の軽量・コンパクト化を図ると共に、温度上昇を抑えて長寿命化を図った第４世代構造の車輪用軸受装置が要望されていた。   In this conventional wheel bearing device, the fitting portion 69b of the shaft portion 69 is expanded in diameter so as to bite into the concavo-convex portion 55 of the hub wheel 51, and the hub wheel 51 and the outer joint member 63 are integrally plastically coupled to reduce the weight.・ Although a reduction in size has been achieved, in such a fourth-generation wheel bearing device, the double-row rolling bearing 52 and the constant velocity universal joint 53 are unitized. There is a problem that the temperature rises easily during operation. Due to this temperature rise, the deterioration of the lubricating grease sealed in the double-row rolling bearing 52 and the constant velocity universal joint 53 has progressed, and the durability of the apparatus may be reduced. In recent years, development of heat-resistant grease has progressed, but there has been a demand for a fourth-generation wheel bearing device that achieves a lighter and more compact device and a longer life by suppressing temperature rise.

本発明は、このような事情に鑑みてなされたもので、軽量・コンパクト化を図ると共に、温度上昇を抑えて長寿命化を図った第４世代構造の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 an object of the present invention is to provide a fourth-generation wheel bearing device having a light weight and a compact size and suppressing a rise in temperature to achieve a long life. It is said.

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、ハブ輪と複列の転がり軸受および等速自在継手がユニット化された車輪用軸受装置であって、外周に懸架装置に取り付けられるための車体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、およびこのハブ輪に嵌合され、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前記等速自在継手の外側継手部材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、前記ハブ輪と外側継手部材とが一体に結合された車輪用軸受装置において、前記等速自在継手が、軸線に対して周方向一方に所定の角度だけねじれた第１のトラック溝と、周方向の他方に所定の角度だけねじれた第２のトラック溝と、これらの第１および第２のトラック溝間に軸線方向にストレートに延びる第３のトラック溝とが形成されたトラック溝を有する外側継手部材と、これらトラック溝に対応して相反する方向に所定の角度ねじれたトラック溝を有する継手内輪と、前記両トラック溝間に収容されたトルク伝達ボールと、これらトルク伝達ボールを転動自在に保持するケージとを備えたクロストラックタイプの等速自在継手で構成されている。   In order to achieve such an object, the invention according to claim 1 of the present invention is a wheel bearing device in which a hub wheel, a double row rolling bearing and a constant velocity universal joint are unitized, and is a suspension device on the outer periphery. An outer member having a double row outer rolling surface formed on the inner periphery, a wheel mounting flange integrally formed at one end, and the double row on the outer periphery. One inner rolling surface facing the outer rolling surface, a hub wheel formed with a small-diameter step portion extending in the axial direction from the inner rolling surface, and fitted to the hub wheel, the double row is arranged on the outer periphery. An inner member composed of an outer joint member of the constant velocity universal joint formed with the other inner rolling surface facing the outer rolling surface, and rolling between both rolling surfaces of the inner member and the outer member. The hub wheel and the outer joint member are integrally coupled to each other. In the wheel bearing apparatus, the constant velocity universal joint includes a first track groove twisted by a predetermined angle in one circumferential direction with respect to the axis, and a second track groove twisted by a predetermined angle in the other circumferential direction. An outer joint member having a track groove in which a track groove and a third track groove extending straight in the axial direction between the first and second track grooves are formed, and the outer joint members corresponding to the track grooves are opposite to each other. A cross track type having a joint inner ring having track grooves twisted by a predetermined angle in the direction, a torque transmission ball accommodated between the two track grooves, and a cage for holding these torque transmission balls in a rollable manner, etc. It consists of a quick universal joint.

このように、ハブ輪と外側継手部材とが一体に結合された第４世代構造の車輪用軸受装置において、等速自在継手が、軸線に対して周方向一方に所定の角度だけねじれた第１のトラック溝と、周方向の他方に所定の角度だけねじれた第２のトラック溝と、これらの第１および第２のトラック溝間に軸線方向にストレートに延びる第３のトラック溝とが形成されたトラック溝を有する外側継手部材と、これらトラック溝に対応して相反する方向に所定の角度ねじれたトラック溝を有する継手内輪と、両トラック溝間に収容されたトルク伝達ボールと、これらトルク伝達ボールを転動自在に保持するケージとを備えたクロストラックタイプの等速自在継手で構成されているので、トルク伝達ボールのガタツキを少なく、転動を滑らかにして高効率化を図ると共に、運転中の昇温を抑制することができる。これにより、等速自在継手の内部に封入された潤滑グリースの劣化を防止して長寿命化を図ると共に、内側転走面への熱影響を抑えることができ、複列の転がり軸受の長寿命化を図ることができる。したがって、装置の軽量・コンパクト化を図ると共に、温度上昇を抑えて長寿命化を図った第４世代構造の車輪用軸受装置を提供することができる。   Thus, in the wheel bearing device of the fourth generation structure in which the hub wheel and the outer joint member are integrally coupled, the constant velocity universal joint is twisted by a predetermined angle in one circumferential direction with respect to the axis. Track grooves, second track grooves twisted by a predetermined angle in the other circumferential direction, and third track grooves extending straight in the axial direction between these first and second track grooves. An outer joint member having a track groove, a joint inner ring having a track groove twisted by a predetermined angle in a direction opposite to the track groove, a torque transmission ball accommodated between the track grooves, and the torque transmission Consists of a cross-track type constant velocity universal joint with a cage that holds the ball so that it can roll freely. Together achieve, it is possible to suppress the Atsushi Nobori during operation. This prevents the lubrication grease enclosed in the constant velocity universal joint from deteriorating and extends its service life, while suppressing the influence of heat on the inner rolling surface, and the long service life of double row rolling bearings. Can be achieved. Therefore, it is possible to provide a wheel bearing device having a fourth generation structure that achieves a lighter and more compact device, and suppresses temperature rise to extend the life.

また、本発明のうち請求項２に記載の発明は、ハブ輪と複列の転がり軸受および等速自在継手がユニット化された車輪用軸受装置であって、外周に懸架装置に取り付けられるための車体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、およびこのハブ輪に嵌合され、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前記等速自在継手の外側継手部材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、前記ハブ輪と外側継手部材とが一体に結合された車輪用軸受装置において、前記等速自在継手が、内周に曲線部を有する第１および第２のトラック溝を有する外側継手部材と、これら第１および第２のトラック溝に対応し、外周に曲線部を有する第１および第２のトラック溝を有する継手内輪と、両トラック溝間に収容されたトルク伝達ボールと、これらトルク伝達ボールを転動自在に保持するケージとを備え、隣り合う前記第１および第２のトラック溝の曲率中心が、前記継手中心平面に対して互いに等距離オフセットされたカウンタトラックタイプの等速自在継手で構成されている。   The invention according to claim 2 of the present invention is a wheel bearing device in which a hub wheel, a double row rolling bearing, and a constant velocity universal joint are unitized, and is attached to a suspension device on the outer periphery. An outer member having a body flange integrally, an outer member having a double row outer rolling surface formed on the inner periphery, a wheel mounting flange integrally formed at one end, and an outer member having a double row outer rolling surface on the outer periphery. One opposing inner rolling surface, a hub wheel formed with a small-diameter step extending in the axial direction from the inner rolling surface, and fitted to the hub wheel, the outer circumferential surface of the double row on the outer periphery. An inner member made of an outer joint member of the constant velocity universal joint formed with the other inner rolling surface facing each other, and is accommodated in a freely rollable manner between both rolling surfaces of the inner member and the outer member. A double-row rolling element, wherein the hub wheel and the outer joint member are integrally coupled to each other. The constant velocity universal joint corresponds to the outer joint member having the first and second track grooves having curved portions on the inner periphery, and the curved portion on the outer periphery corresponding to the first and second track grooves. A joint inner ring having first and second track grooves, a torque transmission ball accommodated between the two track grooves, and a cage for holding these torque transmission balls so as to roll freely. The center of curvature of the second track groove is a counter track type constant velocity universal joint that is offset from each other by the same distance from the joint center plane.

このように、ハブ輪と外側継手部材とが一体に結合された第４世代構造の車輪用軸受装置において、等速自在継手が、内周に曲線部を有する第１および第２のトラック溝を有する外側継手部材と、これら第１および第２のトラック溝に対応し、外周に曲線部を有する第１および第２のトラック溝を有する継手内輪と、両トラック溝間に収容されたトルク伝達ボールと、これらトルク伝達ボールを転動自在に保持するケージとを備え、隣り合う第１および第２のトラック溝の曲率中心が、継手中心平面に対して互いに等距離オフセットされたカウンタトラックタイプの等速自在継手で構成されているので、駆動力伝達時もケージを中立位置に保持してケージが外側継手部材の内周や継手内輪の外周に接触する力を軽減することができ、運転中の昇温を抑制することができる。したがって、等速自在継手の内部に封入された潤滑グリースの劣化を防止して長寿命化を図ると共に、内側転走面への熱影響を抑えることができ、複列の転がり軸受の長寿命化を図ることができる。   As described above, in the wheel bearing device of the fourth generation structure in which the hub wheel and the outer joint member are integrally coupled, the constant velocity universal joint includes the first and second track grooves having the curved portion on the inner periphery. An outer joint member, a joint inner ring having first and second track grooves corresponding to the first and second track grooves and having curved portions on the outer periphery, and a torque transmission ball accommodated between the track grooves. And a cage that holds these torque transmission balls in a freely rolling manner, and the center of curvature of the first and second track grooves adjacent to each other is offset by the same distance from the joint center plane. Since it is composed of a speed universal joint, the cage can be held in a neutral position even when driving force is transmitted, reducing the force of the cage contacting the inner periphery of the outer joint member and the outer periphery of the inner ring of the joint. It is possible to suppress the temperature. Therefore, the lubrication grease enclosed in the constant velocity universal joint can be prevented from deteriorating and the service life can be extended, and the heat effect on the inner rolling surface can be suppressed, and the service life of the double row rolling bearing can be extended. Can be achieved.

また、請求項３に記載の発明のように、前記ハブ輪の内径に硬化した凹凸部が形成されると共に、前記外側継手部材に中空状の軸部が突設され、この軸部を前記凹凸部に内嵌し、この嵌合部を拡径させて前記凹凸部に食い込ませて加締め、前記ハブ輪と外側継手部材とが一体に塑性結合されていれば、装置の軽量・コンパクト化を図ると共に、大きなモーメント荷重が負荷されても結合部の緩みを長期間に亘って防止し、耐久性を向上させることができる。   According to a third aspect of the present invention, a hardened uneven portion is formed on the inner diameter of the hub wheel, and a hollow shaft portion is protruded from the outer joint member. If the hub ring and the outer joint member are integrally plastically bonded, the device can be made lighter and more compact. At the same time, even when a large moment load is applied, loosening of the coupling portion can be prevented over a long period of time, and durability can be improved.

本発明に係る車輪用軸受装置は、ハブ輪と複列の転がり軸受および等速自在継手がユニット化された車輪用軸受装置であって、外周に懸架装置に取り付けられるための車体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、およびこのハブ輪に嵌合され、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前記等速自在継手の外側継手部材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、前記ハブ輪と外側継手部材とが一体に結合された車輪用軸受装置において、前記等速自在継手が、軸線に対して周方向一方に所定の角度だけねじれた第１のトラック溝と、周方向の他方に所定の角度だけねじれた第２のトラック溝と、これらの第１および第２のトラック溝間に軸線方向にストレートに延びる第３のトラック溝とが形成されたトラック溝を有する外側継手部材と、これらトラック溝に対応して相反する方向に所定の角度ねじれたトラック溝を有する継手内輪と、前記両トラック溝間に収容されたトルク伝達ボールと、これらトルク伝達ボールを転動自在に保持するケージとを備えたクロストラックタイプの等速自在継手で構成されているので、トルク伝達ボールのガタツキを少なく、転動を滑らかにして高効率化を図ると共に、運転中の昇温を抑制することができる。これにより、等速自在継手の内部に封入された潤滑グリースの劣化を防止して長寿命化を図ると共に、内側転走面への熱影響を抑えることができ、複列の転がり軸受の長寿命化を図ることができる。したがって、装置の軽量・コンパクト化を図ると共に、温度上昇を抑えて長寿命化を図った第４世代構造の車輪用軸受装置を提供することができる。   A wheel bearing device according to the present invention is a wheel bearing device in which a hub wheel, a double row rolling bearing, and a constant velocity universal joint are unitized, and a vehicle body flange to be attached to a suspension device is integrally formed on the outer periphery. An outer member having a double row outer rolling surface formed on the inner periphery, and a wheel mounting flange integrally formed at one end, and one inner side facing the double row outer rolling surface on the outer periphery. A hub ring formed with a rolling surface and a small-diameter step portion extending in the axial direction from the inner rolling surface, and the other inner side that is fitted to the hub wheel and faces the outer surface of the double row on the outer periphery. An inner member composed of an outer joint member of the constant velocity universal joint formed with a rolling surface, and a double row rolling member accommodated between the rolling surfaces of the inner member and the outer member. In a wheel bearing device comprising a moving body, wherein the hub wheel and the outer joint member are integrally coupled The constant velocity universal joint includes a first track groove twisted by a predetermined angle in one circumferential direction with respect to the axis, a second track groove twisted by a predetermined angle in the other circumferential direction, and the first track grooves. And an outer joint member having a track groove formed with a third track groove extending straight in the axial direction between the second track grooves, and a track twisted by a predetermined angle in the opposite direction corresponding to these track grooves It is composed of a cross track constant velocity universal joint including a joint inner ring having a groove, a torque transmission ball accommodated between the two track grooves, and a cage for rotatably holding the torque transmission ball. Therefore, the backlash of the torque transmission ball is reduced, the rolling is smoothed to increase the efficiency, and the temperature rise during operation can be suppressed. This prevents the lubrication grease enclosed in the constant velocity universal joint from deteriorating and extends its service life, while suppressing the influence of heat on the inner rolling surface, and the long service life of double row rolling bearings. Can be achieved. Therefore, it is possible to provide a wheel bearing device having a fourth generation structure that achieves a lighter and more compact device, and suppresses temperature rise to extend the life.

また、本発明に係る車輪用軸受装置は、ハブ輪と複列の転がり軸受および等速自在継手がユニット化された車輪用軸受装置であって、外周に懸架装置に取り付けられるための車体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、およびこのハブ輪に嵌合され、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前記等速自在継手の外側継手部材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、前記ハブ輪と外側継手部材とが一体に結合された車輪用軸受装置において、前記等速自在継手が、内周に曲線部を有する第１および第２のトラック溝を有する外側継手部材と、これら第１および第２のトラック溝に対応し、外周に曲線部を有する第１および第２のトラック溝を有する継手内輪と、両トラック溝間に収容されたトルク伝達ボールと、これらトルク伝達ボールを転動自在に保持するケージとを備え、隣り合う前記第１および第２のトラック溝の曲率中心が、前記継手中心平面に対して互いに等距離オフセットされたカウンタトラックタイプの等速自在継手で構成されているので、駆動力伝達時もケージを中立位置に保持してケージが外側継手部材の内周や継手内輪の外周に接触する力を軽減することができ、運転中の昇温を抑制することができる。したがって、等速自在継手の内部に封入された潤滑グリースの劣化を防止して長寿命化を図ると共に、内側転走面への熱影響を抑えることができ、複列の転がり軸受の長寿命化を図ることができる。   A wheel bearing device according to the present invention is a wheel bearing device in which a hub wheel, a double row rolling bearing, and a constant velocity universal joint are unitized, and a vehicle body flange that is attached to a suspension device on an outer periphery. An outer member integrally formed with a double row outer rolling surface formed on the inner periphery, and a wheel mounting flange integrally formed at one end and facing the double row outer rolling surface on the outer periphery. An inner rolling surface, a hub wheel formed with a small-diameter step portion extending in the axial direction from the inner rolling surface, and the other that is fitted to the hub wheel and faces the outer surface of the double row on the outer periphery. An inner member made of an outer joint member of the constant velocity universal joint formed with an inner raceway surface, and a double row accommodated in a freely rollable manner between both raceway surfaces of the inner member and the outer member A wheel bearing device in which the hub wheel and the outer joint member are integrally coupled. The constant velocity universal joint has an outer joint member having first and second track grooves having curved portions on the inner periphery, and has a curved portion on the outer periphery corresponding to the first and second track grooves. A joint inner ring having first and second track grooves, a torque transmission ball accommodated between the two track grooves, and a cage for holding these torque transmission balls so as to roll freely, the first and second adjacent to each other. Since the center of curvature of the two track grooves is a counter track type constant velocity universal joint that is offset from each other by the same distance from the joint center plane, the cage is held in a neutral position even when driving force is transmitted. The force with which the cage contacts the inner periphery of the outer joint member and the outer periphery of the joint inner ring can be reduced, and the temperature rise during operation can be suppressed. Therefore, the lubrication grease enclosed in the constant velocity universal joint can be prevented from deteriorating and the service life can be extended, and the heat effect on the inner rolling surface can be suppressed, and the service life of the double row rolling bearing can be extended. Can be achieved.

ハブ輪と複列の転がり軸受および等速自在継手がユニット化された車輪用軸受装置であって、外周に懸架装置に取り付けられるための車体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、およびこのハブ輪に嵌合され、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前記等速自在継手の外側継手部材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、前記ハブ輪の内周に硬化した凹凸部が形成されると共に、前記外側継手部材の軸部がこの凹凸部に内嵌され、この嵌合部を拡径させて前記凹凸部に食い込ませて加締め、前記ハブ輪と外側継手部材とが一体に塑性結合された車輪用軸受装置において、前記等速自在継手が、軸線に対して周方向一方に所定の角度だけねじれた第１のトラック溝と、周方向の他方に所定の角度だけねじれた第２のトラック溝と、これらの第１および第２のトラック溝間に軸線方向にストレートに延びる第３のトラック溝とが形成されたトラック溝を有する外側継手部材と、これらトラック溝に対応して相反する方向に所定の角度ねじれたトラック溝を有する継手内輪と、前記両トラック溝間に収容されたトルク伝達ボールと、これらトルク伝達ボールを転動自在に保持するケージとを備えたクロストラックタイプの等速自在継手で構成されている。   A wheel bearing device in which a hub wheel, a double row rolling bearing and a constant velocity universal joint are unitized, and has a body flange integrally attached to a suspension device on the outer periphery, and an outer periphery of the double row on the inner periphery. An outer member on which a rolling surface is formed, a wheel mounting flange at one end, and one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and this inner rolling surface The hub wheel formed with a small-diameter step portion extending in the axial direction from the outer ring, and the constant speed with which the other inner rolling surface that is fitted to the hub wheel and faces the outer rolling surface of the double row is formed on the outer periphery. An inner member formed of an outer joint member of a universal joint, and a double row rolling element that is rotatably accommodated between both rolling surfaces of the inner member and the outer member, A concavo-convex portion cured around the periphery is formed, and the shaft portion of the outer joint member is fitted into the concavo-convex portion. In the wheel bearing device in which the diameter of the fitting portion is expanded and bitten into the uneven portion and caulked, and the hub wheel and the outer joint member are integrally plastically coupled, the constant velocity universal joint is A first track groove twisted by a predetermined angle in one circumferential direction, a second track groove twisted by a predetermined angle in the other circumferential direction, and an axial direction between these first and second track grooves An outer joint member having a track groove formed with a third track groove extending in a straight line, a joint inner ring having a track groove twisted at a predetermined angle in a direction opposite to the track groove, and both the tracks. The cross-track type constant velocity universal joint includes a torque transmission ball accommodated between the grooves and a cage that holds the torque transmission ball in a rollable manner.

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第１の実施形態を示す縦断面図、図２は、図１の外側継手部材を内径側から見た模式図である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, and FIG. 2 is a schematic view of the outer joint member of FIG. 1 viewed from the inner diameter side.

この車輪用軸受装置は、ハブ輪１と複列の転がり軸受２および等速自在継手３をユニット化して構成され、第４世代と称される構成を備えている。複列の転がり軸受２は、外方部材４と内方部材５、および両部材間に収容された複列の転動体（ボール）６、６とを備えている。   This wheel bearing device is configured by unitizing the hub wheel 1, the double row rolling bearing 2 and the constant velocity universal joint 3, and has a configuration referred to as a fourth generation. The double row rolling bearing 2 includes an outer member 4, an inner member 5, and double row rolling elements (balls) 6, 6 accommodated between the two members.

外方部材４はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中炭素鋼で形成され、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４ｂを一体に有し、内周に複列の外側転走面４ａ、４ａが形成されている。そして、これら複列の外側転走面４ａ、４ａ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 outer member 4 is formed of medium carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and integrally includes a vehicle body mounting flange 4b to be attached to a knuckle (not shown). Double row outer rolling surfaces 4a, 4a are formed. The double row outer raceway surfaces 4a and 4a are hardened by induction hardening to a surface hardness of 58 to 64 HRC.

内方部材５は、ハブ輪１と、このハブ輪１に内嵌された後述する外側継手部材１０とを備えている。ハブ輪１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７を一体に有し、外周に複列の外側転走面４ａ、４ａに対向する一方（アウター側）の内側転走面１ａと、この内側転走面１ａから軸方向に延びる円筒状の小径段部１ｂが形成されている。車輪取付フランジ７の周方向等配には車輪を固定するハブボルト８が植設されている。ハブ輪１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１ａをはじめ、車輪取付フランジ７の基部から小径段部１ｂ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。   The inner member 5 includes a hub wheel 1 and an outer joint member 10 to be described later that is fitted into the hub wheel 1. The hub wheel 1 integrally has a wheel mounting flange 7 for mounting a wheel (not shown) at an end portion on the outer side, and one side (outer side) facing the double-row outer raceway surfaces 4a and 4a on the outer periphery. ) And a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a. Hub bolts 8 for fixing the wheels are planted at equal intervals in the circumferential direction of the wheel mounting flange 7. The hub wheel 1 is made of medium carbon steel containing 0.40 to 0.80% by weight of carbon, such as S53C, and has a high frequency from the inner rolling surface 1a to the small diameter step portion 1b from the base of the wheel mounting flange 7. The surface hardness is hardened by quenching to a range of 58 to 64 HRC.

ここで、ハブ輪１の内周には高周波焼入れによって硬化された凹凸部９が形成されている。この凹凸部９はアヤメローレット状に形成され、旋削等により独立して形成された複数の環状溝と、ブローチ加工等により形成された複数の軸方向溝とを略直交させて構成した交叉溝、あるいは、互いに傾斜した螺旋溝で構成した交叉溝からなる。また、凹凸部９の凸部は良好な食い込み性を確保するために、その先端部が三角形状等の尖塔形状に形成されている。   Here, an uneven portion 9 that is hardened by induction hardening is formed on the inner periphery of the hub wheel 1. The concavo-convex portion 9 is formed in an iris knurl shape, and a plurality of annular grooves formed independently by turning or the like and a plurality of axial grooves formed by broaching or the like are crossed grooves configured to be substantially orthogonal, Or it consists of the crossing groove | channel comprised by the helical groove | channel inclined mutually. Further, in order to ensure good biting property, the tip of the concavo-convex portion 9 is formed in a spire shape such as a triangular shape.

等速自在継手３は、外側継手部材１０と継手内輪１１とケージ１２およびトルク伝達ボール１３とからなる。外側継手部材１０は、カップ状のマウス部１４と、このマウス部１４の底部をなす肩部１５と、この肩部１５から軸方向に延びる中空状の軸部１６が一体に形成されている。肩部１５の外周には、前記外方部材４の複列の外側転走面４ａ、４ａに対向する他方（インナー側）の内側転走面１０ａが形成されている。また、軸部１６には、ハブ輪１の小径段部１ｂに所定のシメシロを介して円筒嵌合するインロウ部１６ａと、このインロウ部１６ａの端部に嵌合部１６ｂがそれぞれ形成されている。   The constant velocity universal joint 3 includes an outer joint member 10, a joint inner ring 11, a cage 12 and a torque transmission ball 13. The outer joint member 10 is integrally formed with a cup-shaped mouth portion 14, a shoulder portion 15 that forms the bottom of the mouth portion 14, and a hollow shaft portion 16 that extends from the shoulder portion 15 in the axial direction. On the outer periphery of the shoulder portion 15, the other (inner side) inner rolling surface 10 a facing the double row outer rolling surfaces 4 a, 4 a of the outer member 4 is formed. The shaft portion 16 is formed with an inrow portion 16a that is cylindrically fitted to the small-diameter step portion 1b of the hub wheel 1 via a predetermined shimiro, and a fitting portion 16b is formed at the end of the inrow portion 16a. .

外側継手部材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、内側転走面１０ａをはじめ、肩部１５の外周から軸部１６のインロウ部１６ａ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、嵌合部１６ｂは鍛造後の表面硬さの生のままとされている。   The outer joint member 10 is formed of medium carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the inner joint surface 10a and the outer periphery of the shoulder portion 15 to the inrow portion 16a of the shaft portion 16 Thus, the surface hardness is set to a range of 58 to 64 HRC by induction hardening. In addition, the fitting part 16b is left with the raw surface hardness after forging.

外方部材４と内方部材５のそれぞれの転走面４ａ、１ａと４ａ、１０ａ間に複列の転動体６、６が収容され、保持器１７、１７によりこれら複列の転動体６、６が転動自在に保持されている。また、外方部材４と内方部材５との間に形成される環状空間の開口部にはシール１８、１９が装着され、軸受内部に封入した潤滑グリースの漏洩と、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、複列の転がり軸受２として転動体６にボールを用いた複列アンギュラ玉軸受で構成されたものを例示したが、これに限らず、例えば、転動体に円すいころを用いた複列円すいころ軸受で構成されていても良い。   Double-row rolling elements 6, 6 are accommodated between the rolling surfaces 4a, 1a, 4a, 10a of the outer member 4 and the inner member 5, and these double-row rolling elements 6, 17 are held by the cages 17, 17, respectively. 6 is rotatably held. Further, seals 18 and 19 are attached to the opening of the annular space formed between the outer member 4 and the inner member 5, leakage of the lubricating grease sealed inside the bearing, rainwater, dust, etc. from the outside Is prevented from entering the inside of the bearing. In addition, although what was comprised by the double row angular contact ball bearing which used the ball for the rolling element 6 as the double row rolling bearing 2 was illustrated here, it is not restricted to this, For example, the tapered roller was used for the rolling element. You may be comprised with the double row tapered roller bearing.

ここで、ハブ輪１に外側継手部材１０の軸部１６が所定のシメシロで圧入され、小径段部１ｂの端面に外側継手部材１０の肩部１５が衝合されて所定の予圧が付与された状態で、嵌合部１６ｂの内径にマンドレル等の拡径治具をアウター側に押し込んで嵌合部１６ｂを拡径し、この嵌合部１６ｂをハブ輪１の凹凸部９に食い込ませて加締め、ハブ輪１と外側継手部材１０が一体に塑性結合されている。これにより、装置の軽量・コンパクト化を図ると共に、大きなモーメント荷重が負荷されても結合部の緩みを長期間に亘って防止し、耐久性を向上させることができる。符号２０は、外側継手部材１０の肩部１５に内嵌されたエンドキャップで、継手内部に封入された潤滑グリースの外部への漏洩と、外部から継手内部に雨水やダスト等の異物が侵入するのを防止している。   Here, the shaft portion 16 of the outer joint member 10 is press-fitted into the hub wheel 1 with a predetermined squeezing force, and the shoulder portion 15 of the outer joint member 10 is brought into contact with the end surface of the small-diameter stepped portion 1b to apply a predetermined preload. In this state, a diameter expansion jig such as a mandrel is pushed into the inner diameter of the fitting portion 16b toward the outer side to expand the diameter of the fitting portion 16b, and the fitting portion 16b is bitten into the uneven portion 9 of the hub wheel 1. The hub wheel 1 and the outer joint member 10 are integrally plastically coupled. As a result, the device can be reduced in weight and size, and even when a large moment load is applied, loosening of the coupling portion can be prevented over a long period of time, and durability can be improved. Reference numeral 20 denotes an end cap that is fitted into the shoulder 15 of the outer joint member 10. Leakage of the lubricating grease sealed inside the joint and foreign matters such as rainwater and dust enter the joint from the outside. Is preventing.

なお、ここでは、ハブ輪１と外側継手部材１０とを拡径加締によって一体に塑性結合した構造を例示したが、これに限らず、例えば、図示はしないが、ハブ輪に外側継手部材の軸部を内嵌し、この軸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ってハブ輪と外側継手部材が一体化される、所謂揺動加締によって塑性結合される構造であっても良い。また、溶接によってハブ輪と外側継手部材が一体固定される構造であっても良い。   Here, the structure in which the hub wheel 1 and the outer joint member 10 are integrally plastically joined by diameter expansion caulking is illustrated, but this is not a limitation. For example, although not illustrated, the hub wheel 1 and the outer joint member 10 are connected to the hub wheel. The hub wheel and the outer joint member are integrated by a so-called rocking caulking, which is integrated by a caulking portion formed by internally fitting the shank and plastically deforming the end of the shank radially outward. It may be a structure. Moreover, the structure in which a hub ring and an outer joint member are integrally fixed by welding may be sufficient.

ここで、図２に示すように、外側継手部材１０のマウス部１４の内周に、軸線に対して周方向一方に所定の角度αだけねじれた第１のトラック溝１４ａと、周方向の他方に所定の角度αだけねじれた第２のトラック溝１４ｂと、これらの第１および第２のトラック溝１４ａ、１４ｂ間に軸線方向にストレートに延びる第３のトラック溝１４ｃとが形成されている。一方、継手内輪１１の外周には、これらの第１および第２のトラック溝１４ａ、１４ｂに対応して相反する方向に所定の角度αだけねじれた第１および第２のトラック溝１１ａ、１１ｂと、軸線方向にストレートに延びる第３のトラック溝１１ｃとが形成されている。トルク伝達ボール１３はこれらの第１のトラック溝１４ａ、１１ａおよび第２のトラック溝１４ｂ、１１ｂの交差部および第３のトラック溝１４ｃ、１１ｃ間に収容され、内径が円筒状に形成されたケージ１２によって保持されている。   Here, as shown in FIG. 2, on the inner periphery of the mouth portion 14 of the outer joint member 10, a first track groove 14a twisted by a predetermined angle α in one circumferential direction with respect to the axis, and the other circumferential member A second track groove 14b twisted by a predetermined angle α and a third track groove 14c extending straight in the axial direction are formed between the first and second track grooves 14a, 14b. On the other hand, on the outer periphery of the joint inner ring 11, there are first and second track grooves 11a, 11b twisted by a predetermined angle α in opposite directions corresponding to the first and second track grooves 14a, 14b. A third track groove 11c extending straight in the axial direction is formed. The torque transmission ball 13 is accommodated between the intersection of the first track grooves 14a and 11a and the second track grooves 14b and 11b and the third track grooves 14c and 11c, and the cage has an inner diameter formed in a cylindrical shape. 12 is held.

本実施形態では、軸線に対して周方向に所定の角度αねじれたトラック溝１４ａ、１４ｂ、１１ａ、１１ｂを備えた、所謂クロストラックタイプの等速自在継手３を採用したので、トルク伝達ボール１３のガタツキを少なく、転動を滑らかにして高効率化を図ると共に、運転中の昇温を抑制することができる。これにより、等速自在継手３の内部に封入された潤滑グリースの劣化を防止して長寿命化を図ると共に、肩部１５の外周に直接形成された内側転走面１０ａへの熱影響を抑えることができ、複列の転がり軸受２の長寿命化を図ることができる。したがって、装置の軽量・コンパクト化を図ると共に、温度上昇を抑えて長寿命化を図った第４世代構造の車輪用軸受装置を提供することができる。   In the present embodiment, the so-called cross track type constant velocity universal joint 3 provided with track grooves 14a, 14b, 11a, 11b twisted by a predetermined angle α in the circumferential direction with respect to the axis is adopted. The backlash can be reduced, the rolling can be smoothed to increase the efficiency, and the temperature rise during operation can be suppressed. As a result, deterioration of the lubricating grease enclosed in the constant velocity universal joint 3 is prevented to extend the life, and the thermal influence on the inner rolling surface 10a formed directly on the outer periphery of the shoulder portion 15 is suppressed. Therefore, the life of the double row rolling bearing 2 can be extended. Therefore, it is possible to provide a wheel bearing device having a fourth generation structure that achieves a lighter and more compact device, and suppresses temperature rise to extend the life.

図３は、本発明に係る車輪用軸受装置の第２の実施形態を示す縦断面図である。なお、この実施形態は、前述した実施形態と基本的には等速自在継手の構成が異なるだけで、その他同一部品同一部位あるいは同一機能を有する部位には同じ符号を付して詳細な説明を省略する。   FIG. 3 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention. Note that this embodiment basically differs from the above-described embodiment only in the configuration of the constant velocity universal joint, and other parts having the same parts or the same functions are denoted by the same reference numerals for detailed description. Omitted.

この車輪用軸受装置は、ハブ輪１と複列の転がり軸受２１および等速自在継手２２がユニット化して構成され、第４世代と称される構成を備えている。複列の転がり軸受２１は、外方部材４と内方部材２３、および両部材４、２３間に収容された複列の転動体６、６とを備えている。内方部材２３は、ハブ輪１と、このハブ輪１に内嵌された外側継手部材２４とを備えている。   In this wheel bearing device, the hub wheel 1, the double-row rolling bearing 21 and the constant velocity universal joint 22 are configured as a unit, and has a configuration referred to as a fourth generation. The double-row rolling bearing 21 includes an outer member 4, an inner member 23, and double-row rolling elements 6 and 6 accommodated between the members 4 and 23. The inner member 23 includes a hub wheel 1 and an outer joint member 24 fitted in the hub wheel 1.

等速自在継手２２は、外側継手部材２４と継手内輪２５とケージ２６およびトルク伝達ボール１３とからなる。外側継手部材２４は、カップ状のマウス部２７と、このマウス部２７の底部をなす肩部１５と、この肩部１５から軸方向に延びる円筒状の軸部１６が一体に形成されている。   The constant velocity universal joint 22 includes an outer joint member 24, a joint inner ring 25, a cage 26, and a torque transmission ball 13. The outer joint member 24 is integrally formed with a cup-shaped mouth portion 27, a shoulder portion 15 that forms the bottom portion of the mouth portion 27, and a cylindrical shaft portion 16 that extends from the shoulder portion 15 in the axial direction.

外側継手部材２４はＳ５３Ｃ等の炭素０．４０〜０．８０重量％を含む中炭素鋼で形成され、肩部１５の外周および内側転走面１０ａ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 outer joint member 24 is formed of medium carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the outer periphery of the shoulder portion 15 and the inner rolling surface 10a have a surface hardness of 58 to 64 HRC by induction hardening. Hardened to range.

ここで、外側継手部材２４のマウス部２７の内周に、曲線部を有する第１のトラック溝２７ａと第２のトラック溝２７ｂが軸方向に延びて形成されている。この第１のトラック溝２７ａと第２のトラック溝２７ｂに対応して継手内輪２５の外周はに曲線部を有する第１のトラック溝２５ａと第２のトラック溝２５ｂが形成されている。そして、これら第１のトラック溝２７ａ、２５ａと第２のトラック溝２７ｂ、２５ｂ間にトルク伝達ボール１３が収容されている。   Here, on the inner periphery of the mouth portion 27 of the outer joint member 24, a first track groove 27a and a second track groove 27b having curved portions are formed extending in the axial direction. Corresponding to the first track groove 27a and the second track groove 27b, the outer periphery of the joint inner ring 25 is formed with a first track groove 25a and a second track groove 25b having curved portions. The torque transmission ball 13 is accommodated between the first track grooves 27a and 25a and the second track grooves 27b and 25b.

外側継手部材２４の第１のトラック溝２７ａと、この第１のトラック溝２７ａと隣り合う第２のトラック溝２７ｂの曲率中心Ｏ１、Ｏ２は、継手中心Ｘ−Ｘ平面に対して軸方向に等距離ｅだけオフセットしている。一方、継手内輪２５の第１のトラック溝２５ａと、この第１のトラック溝２５ａと隣り合う第２のトラック溝２５ｂの曲率中心も同様、継手中心Ｘ−Ｘ平面に対して軸方向に等距離だけオフセットしている。ケージ２６は、凹球面に形成されたマウス部２７の内周面と、凸球面に形成された継手内輪２５の外周面によって案内された状態でトルク伝達ボール１３を保持している。   The curvature centers O1 and O2 of the first track groove 27a of the outer joint member 24 and the second track groove 27b adjacent to the first track groove 27a are equal to each other in the axial direction with respect to the joint center XX plane. Offset by distance e. On the other hand, the center of curvature of the first track groove 25a of the joint inner ring 25 and the second track groove 25b adjacent to the first track groove 25a are also equidistant in the axial direction with respect to the joint center XX plane. Is just offset. The cage 26 holds the torque transmission ball 13 in a state of being guided by the inner peripheral surface of the mouth portion 27 formed on the concave spherical surface and the outer peripheral surface of the joint inner ring 25 formed on the convex spherical surface.

本実施形態では、対応する第１のトラック溝２７ａ、２５ａが第１の方向Ｒ１に開いた制御角度を備えると共に、対応する第２のトラック溝２７ｂ、２５ｂが、第１の方向Ｒ１と反対側の第２の方向Ｒ２に開いた制御角度を備え、トルク伝達ボール１３を軸方向相反する方向に押し出すように保持する、所謂カウンタトラックタイプの等速自在継手２２を採用したので、駆動力伝達時もケージ２６を中立位置に保持することができる。したがって、ケージ２６がマウス部２７の内周や継手内輪２５の外周に接触する力を軽減することができ、運転中の昇温を抑制することができる。これにより、前述した実施形態と同様、等速自在継手２２の内部に封入された潤滑グリースの劣化を防止して長寿命化を図ると共に、肩部１５の外周に直接形成された内側転走面１０ａへの熱影響を抑えることができ、複列の転がり軸受２１の長寿命化を図ることができる。   In the present embodiment, the corresponding first track grooves 27a and 25a have a control angle opened in the first direction R1, and the corresponding second track grooves 27b and 25b are opposite to the first direction R1. The so-called counter track type constant velocity universal joint 22 that has a control angle opened in the second direction R2 and holds the torque transmission ball 13 so as to push out in the opposite direction of the axial direction is adopted. Can also hold the cage 26 in a neutral position. Therefore, the force with which the cage 26 contacts the inner periphery of the mouse part 27 and the outer periphery of the joint inner ring 25 can be reduced, and the temperature rise during operation can be suppressed. Thus, as in the above-described embodiment, the lubrication grease enclosed in the constant velocity universal joint 22 is prevented from deteriorating to extend its life, and the inner rolling surface formed directly on the outer periphery of the shoulder portion 15. The influence of heat on 10a can be suppressed, and the life of the double row rolling bearing 21 can be extended.

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、ハブ輪と等速自在継手と複列の転がり軸受とがユニット化された第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 fourth generation structure in which a hub wheel, a constant velocity universal joint, and a double row rolling bearing are unitized.

本発明に係る車輪用軸受装置の第１の実施形態を示す縦断面図である。It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. 図１の外側継手部材の内径から見た模式図である。It is the schematic diagram seen from the internal diameter of the outer joint member of FIG. 本発明に係る車輪用軸受装置の第２の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. 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.

符号の説明Explanation of symbols

１・・・・・・・・・・・・・・・・ハブ輪
１ａ、１０ａ・・・・・・・・・・・内側転走面
１ｂ・・・・・・・・・・・・・・・小径段部
２、２１・・・・・・・・・・・・・複列の転がり軸受
３、２２・・・・・・・・・・・・・等速自在継手
４・・・・・・・・・・・・・・・・外方部材
４ａ・・・・・・・・・・・・・・・外側転走面
４ｂ・・・・・・・・・・・・・・・車体取付フランジ
５、２３・・・・・・・・・・・・・内方部材
６・・・・・・・・・・・・・・・・転動体
７・・・・・・・・・・・・・・・・車輪取付フランジ
８・・・・・・・・・・・・・・・・ハブボルト
９・・・・・・・・・・・・・・・・凹凸部
１０、２４・・・・・・・・・・・・外側継手部材
１１、２５・・・・・・・・・・・・継手内輪
１１ａ、１４ａ、２５ａ、２７ａ・・第１のトラック溝
１１ｂ、１４ｂ、２５ｂ、２７ｂ・・第２のトラック溝
１１ｃ、１４ｃ・・・・・・・・・・第３のトラック溝
１２、２６・・・・・・・・・・・・ケージ
１３・・・・・・・・・・・・・・・トルク伝達ボール
１４、２７・・・・・・・・・・・・マウス部
１５・・・・・・・・・・・・・・・肩部
１６・・・・・・・・・・・・・・・軸部
１６ａ・・・・・・・・・・・・・・インロウ部
１６ｂ・・・・・・・・・・・・・・嵌合部
１７・・・・・・・・・・・・・・・保持器
１８、１９・・・・・・・・・・・・シール
２０・・・・・・・・・・・・・・・エンドキャップ
５１・・・・・・・・・・・・・・・ハブ輪
５１ａ、６３ａ・・・・・・・・・・内側転走面
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・・・・・・・・・・・・・・・凹凸部
５６・・・・・・・・・・・・・・・ハブボルト
５７・・・・・・・・・・・・・・・外方部材
５７ａ・・・・・・・・・・・・・・外側転走面
５７ｂ・・・・・・・・・・・・・・車体取付フランジ
５８・・・・・・・・・・・・・・・内方部材
５９・・・・・・・・・・・・・・・ボール
６０・・・・・・・・・・・・・・・保持器
６１、６２・・・・・・・・・・・・シール
６３・・・・・・・・・・・・・・・外側継手部材
６４・・・・・・・・・・・・・・・継手内輪
６５・・・・・・・・・・・・・・・ケージ
６６・・・・・・・・・・・・・・・トルク伝達ボール
６７・・・・・・・・・・・・・・・マウス部
６８・・・・・・・・・・・・・・・肩部
６９・・・・・・・・・・・・・・・軸部
６９ａ・・・・・・・・・・・・・・インロウ部
６９ｂ・・・・・・・・・・・・・・嵌合部
ｅ・・・・・・・・・・・・・・・・オフセット量
Ｏ１、Ｏ２・・・・・・・・・・・・曲率中心
Ｒ１・・・・・・・・・・・・・・・第１の方向
Ｒ２・・・・・・・・・・・・・・・第２の方向
α・・・・・・・・・・・・・・・・ねじれ角 1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a, 10a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 1b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Small-diameter stepped portions 2, 21 ... Double row rolling bearings 3, 22 ... Constant velocity universal joints ... · · · · · · · · Outer member 4a · · · outer rolling surface 4b ... ... Car body mounting flanges 5, 23 ... Inward member 6 ... Rolling elements 7 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Uneven Portions 10, 24, ... Outer joint member 11, 25, ... Joint inner ring 11 , 14a, 25a, 27a .. First track grooves 11b, 14b, 25b, 27b... Second track grooves 11c, 14c... ... Cage 13 ... Torque transmission balls 14, 27 ......... Mouse part 15 ... ... shoulder 16 ... shaft 16a ... inrow 16b ... Fitting part 17 ... Cage 18, 19 ... -Seal 20 ... End cap 51 ... Hub wheels 51a, 63a ...・ Inner rolling surface 52 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Double row rolling bearing 53 ・ ・ ・ ・ ・ Constant velocity universal joint 54 ・ ・ ・ ・ ・ ・ ・ ・ Wheel Mounting flange 55 ... Uneven part 56 ... Hub bolt 57 ... ... Outside member 57a ... Outer rolling surface 57b ... Car body mounting flange 58 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ball 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cage 61, 62 .... Seal 63 ..... Outer joint member 64 ..... Fitting inner ring 65 ... Cage 66 ...・ ・ ・ Torque transmission ball 67 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mouse part 68 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 69 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Shaft 69a ・ ・ ・ ・ ・ ・ ・ ・ ・ In-row 69b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fitting e ・ ・ ・ ・············· Offset amount O1, O2 ··············· curvature center R1 Direction R2 ... 2nd direction α ... Torsion angle

Claims (3)

ハブ輪と複列の転がり軸受および等速自在継手がユニット化された車輪用軸受装置であって、
外周に懸架装置に取り付けられるための車体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、およびこのハブ輪に嵌合され、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前記等速自在継手の外側継手部材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、
前記ハブ輪と外側継手部材とが一体に結合された車輪用軸受装置において、
前記等速自在継手が、軸線に対して周方向一方に所定の角度だけねじれた第１のトラック溝と、周方向の他方に所定の角度だけねじれた第２のトラック溝と、これらの第１および第２のトラック溝間に軸線方向にストレートに延びる第３のトラック溝とが形成された外側継手部材と、これらトラック溝に対応して相反する方向に所定の角度ねじれたトラック溝を有する継手内輪と、前記両トラック溝間に収容されたトルク伝達ボールと、これらトルク伝達ボールを転動自在に保持するケージとを備えたクロストラックタイプの等速自在継手で構成されていることを特徴とする車輪用軸受装置。 A wheel bearing device in which a hub wheel and a double row rolling bearing and a constant velocity universal joint are unitized,
An outer member having a body flange integrally attached to the suspension on the outer periphery and having a double row outer raceway formed on the inner periphery;
A wheel mounting flange is integrally formed at one end, and one inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery, and a small diameter step portion extending in the axial direction from the inner rolling surface is formed. An inner member composed of a hub wheel and an outer joint member of the constant velocity universal joint, which is fitted to the hub wheel and has an outer periphery formed with the other inner rolling surface facing the double row outer rolling surface. ,
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
In the wheel bearing device in which the hub wheel and the outer joint member are integrally coupled,
The constant velocity universal joint includes a first track groove twisted by a predetermined angle in one circumferential direction with respect to the axis, a second track groove twisted by a predetermined angle in the other circumferential direction, and the first track grooves. And an outer joint member formed with a third track groove extending straight in the axial direction between the second track grooves, and a joint having track grooves twisted at a predetermined angle in opposite directions corresponding to these track grooves A cross track type constant velocity universal joint comprising an inner ring, a torque transmission ball accommodated between the both track grooves, and a cage for holding the torque transmission ball in a rollable manner, Wheel bearing device. ハブ輪と複列の転がり軸受および等速自在継手がユニット化された車輪用軸受装置であって、
外周に懸架装置に取り付けられるための車体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、およびこのハブ輪に嵌合され、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前記等速自在継手の外側継手部材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、
前記ハブ輪と外側継手部材とが一体に結合された車輪用軸受装置において、
前記等速自在継手が、内周に曲線部を有する第１および第２のトラック溝を有する外側継手部材と、これら第１および第２のトラック溝に対応し、外周に曲線部を有する第１および第２のトラック溝を有する継手内輪と、両トラック溝間に収容されたトルク伝達ボールと、これらトルク伝達ボールを転動自在に保持するケージとを備え、隣り合う前記第１および第２のトラック溝の曲率中心が、前記継手中心平面に対して互いに等距離オフセットされたカウンタトラックタイプの等速自在継手で構成されていることを特徴とする車輪用軸受装置。 A wheel bearing device in which a hub wheel and a double row rolling bearing and a constant velocity universal joint are unitized,
An outer member having a body flange integrally attached to the suspension on the outer periphery and having a double row outer raceway formed on the inner periphery;
A wheel mounting flange is integrally formed at one end, and one inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery, and a small diameter step portion extending in the axial direction from the inner rolling surface is formed. An inner member composed of a hub wheel and an outer joint member of the constant velocity universal joint, which is fitted to the hub wheel and has an outer periphery formed with the other inner rolling surface facing the double row outer rolling surface. ,
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
In the wheel bearing device in which the hub wheel and the outer joint member are integrally coupled,
The constant velocity universal joint includes an outer joint member having first and second track grooves having curved portions on the inner periphery, and a first corresponding to the first and second track grooves and having curved portions on the outer periphery. And a joint inner ring having a second track groove, a torque transmission ball accommodated between the two track grooves, and a cage for holding the torque transmission ball in a rollable manner. A wheel bearing device, characterized in that the center of curvature of the track groove is constituted by a counter track type constant velocity universal joint which is offset from each other by an equal distance with respect to the joint center plane. 前記ハブ輪の内径に硬化した凹凸部が形成されると共に、前記外側継手部材に中空状の軸部が突設され、この軸部を前記凹凸部に内嵌し、この嵌合部を拡径させて前記凹凸部に食い込ませて加締め、前記ハブ輪と外側継手部材とが一体に塑性結合されている請求項１または２に記載の車輪用軸受装置。   A hardened uneven portion is formed on the inner diameter of the hub wheel, and a hollow shaft portion is projected from the outer joint member. The shaft portion is fitted into the uneven portion, and the diameter of the fitting portion is increased. 3. The wheel bearing device according to claim 1, wherein the hub wheel and the outer joint member are integrally plastically coupled by biting into the uneven portion and caulking. 4.
JP2006094415A 2006-03-30 2006-03-30 Bearing device for wheel Pending JP2007270868A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012141051A (en) * 2011-01-06 2012-07-26 Ntn Corp Fixed-type constant-velocity universal joint

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012141051A (en) * 2011-01-06 2012-07-26 Ntn Corp Fixed-type constant-velocity universal joint
US8979659B2 (en) 2011-01-06 2015-03-17 Ntn Corporation Fixed-type constant-velocity universal joint

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