JP5166756B2 - Wheel bearing and wheel bearing device provided with the same - Google Patents

Description

本発明は、自動車等の車両の車輪を回転自在に支承する車輪用軸受、詳しくは、軽量・コンパクト化と低コスト化を図ると共に、軸受の耐久性の向上を図った車輪用軸受およびこれを備えた車輪用軸受装置に関するものである。   The present invention relates to a wheel bearing for rotatably supporting a wheel of a vehicle such as an automobile, and more particularly, to a wheel bearing for reducing the weight, size and cost, and improving the durability of the bearing. The present invention relates to a wheel bearing device provided.

従来から自動車等の車輪を支持する車輪用軸受装置は、車輪を取り付けるためのハブ輪を複列の転がり軸受を介して回転自在に支承するもので、駆動輪用と従動輪用とがある。構造上の理由から、駆動輪用では内輪回転方式が、従動輪用では内輪回転と外方部材回転の両方式が一般的に採用されている。この車輪用軸受装置には、懸架装置を構成するナックルとハブ輪との間に複列アンギュラ玉軸受等からなる車輪用軸受を嵌合させた第１世代と称される構造から、外方部材の外周に直接車体取付フランジまたは車輪取付フランジが形成された第２世代構造、また、ハブ輪の外周に一方の内側転走面が直接形成された第３世代構造、あるいは、ハブ輪と等速自在継手の外側継手部材の外周にそれぞれ内側転走面が直接形成された第４世代構造とに大別されている。   2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like supports a hub wheel for mounting a wheel rotatably via a double row rolling bearing, and includes a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and both an inner ring rotation method and an outer member rotation method are generally used for driven wheels. This wheel bearing device has a structure called a first generation in which a wheel bearing composed of a double-row angular ball bearing or the like is fitted between a knuckle and a hub wheel constituting a suspension device, and an outer member. 2nd generation structure with body mounting flange or wheel mounting flange formed directly on the outer periphery of the wheel, 3rd generation structure with one inner rolling surface formed directly on the outer periphery of the hub wheel, or constant speed with the hub wheel It is roughly classified into a fourth generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the universal joint.

従来から、内輪および外輪（外方部材）が鋼板からプレス加工によって形成された構造のアンギュラ玉軸受が知られている。例えば、図５に示すアンギュラ玉軸受５０は、磁気ハードディスク装置等に使用されるものであるが、外輪５１および一対の内輪５２、５３は、ステンレス鋼板からプレス加工またはローリング加工によって形成されている。   Conventionally, an angular ball bearing having a structure in which an inner ring and an outer ring (outer member) are formed by pressing from a steel plate is known. For example, the angular ball bearing 50 shown in FIG. 5 is used in a magnetic hard disk device or the like, but the outer ring 51 and the pair of inner rings 52 and 53 are formed from a stainless steel plate by pressing or rolling.

外輪５１は、内周面の略中間部に径方向内方に突出する環状凸部５１ａが形成され、この環状凸部５１ａの両側の内周面に外側転走面５１ｂ、５１ｃが形成されている。この外輪５１は、外周面がハウジング５４の穴に嵌合され、一端部に形成されたフランジ５１ｄがハウジング５４の端面に当接されて、軸方向の位置決めが行われている。また、環状凸部５１ａにより、外輪５１の外周面には環状凹部５１ｅが形成され、この環状凹部５１ｅに接着剤が充填されてハウジング５４の穴に外輪５１が固定されている。   The outer ring 51 is formed with an annular convex portion 51a protruding radially inward at a substantially middle portion of the inner peripheral surface, and outer rolling surfaces 51b and 51c are formed on inner peripheral surfaces on both sides of the annular convex portion 51a. Yes. The outer ring 51 has an outer peripheral surface fitted into a hole in the housing 54, and a flange 51 d formed at one end is brought into contact with the end surface of the housing 54 to perform axial positioning. An annular recess 51e is formed on the outer peripheral surface of the outer ring 51 by the annular protrusion 51a. The annular recess 51e is filled with an adhesive, and the outer ring 51 is fixed to the hole of the housing 54.

一方、内輪５２、５３は、外輪５１の複列の外側転走面５１ｂ、５１ｃの内側に軸方向の両側からそれぞれ嵌合される。これら内輪５２、５３の軸方向外端外周には、湾曲肩部５２ａ、５３ａが形成され、この湾曲肩部５２ａ、５３ａに内側転走面５２ｂ、５３ｂが形成されている。そして、複列のボール５６、５６がこれらの内側転走面５２ｂ、５３ｂと外輪５１の複列の外側転走面５１ｂ、５１ｃとの間に配置され、保持器５７、５７により各列毎に保持されている。   On the other hand, the inner rings 52 and 53 are respectively fitted inside the double row outer raceway surfaces 51b and 51c of the outer ring 51 from both sides in the axial direction. Curved shoulder portions 52a and 53a are formed on the outer circumferences of the outer ends in the axial direction of the inner rings 52 and 53, and inner rolling surfaces 52b and 53b are formed on the curved shoulder portions 52a and 53a. The double rows of balls 56, 56 are arranged between the inner rolling surfaces 52b, 53b and the outer rolling surfaces 51b, 51c of the outer ring 51, and are retained by the cages 57, 57 for each row. Is retained.

内輪５２、５３の内周面には、軸部材５５に隙間嵌めされる嵌合部５２ｃ、５３ｃが形成されている。内輪５２、５３が軸部材５５に軸方向から隙間嵌めされた後、一方の内輪５２の湾曲肩部５２ａに重量が一定の円筒形の重錘５９が乗せられ、この重錘５９の重量により、内輪５２、ボール５６、外輪５１、ボール５６を経由して他方の内輪５３が押圧され、湾曲肩部５３ａが軸部材５５の鍔部５５ａに当接するまで嵌合される。これにより、アンギュラ玉軸受５０に適正な予圧が設定される。   On the inner peripheral surfaces of the inner rings 52 and 53, fitting portions 52c and 53c that are fitted into the shaft member 55 with clearance are formed. After the inner rings 52, 53 are fitted into the shaft member 55 in the axial direction, a cylindrical weight 59 having a constant weight is placed on the curved shoulder 52 a of one inner ring 52, and the weight of the weight 59 The other inner ring 53 is pressed via the inner ring 52, the ball 56, the outer ring 51, and the ball 56, and the curved shoulder portion 53 a is fitted until it comes into contact with the flange portion 55 a of the shaft member 55. Thereby, an appropriate preload is set for the angular ball bearing 50.

この隙間嵌めが完了すると、一方の内輪５２の湾曲肩部５２ａと軸部材５５との間の隙間に接着剤６０が充填され、この接着剤６０で一方の内輪５２の嵌め外れが防止されると共に、軸部材５５の鍔部５５ａで他方の内輪５３の嵌め外れが防止される。
実開平６−１８３５号公報 When this gap fitting is completed, the adhesive 60 is filled in the gap between the curved shoulder portion 52a of the one inner ring 52 and the shaft member 55, and this adhesive 60 prevents the one inner ring 52 from being fitted off. The flange portion 55a of the shaft member 55 prevents the other inner ring 53 from being fitted off.
Japanese Utility Model Publication No. 6-1835

然しながら、この種のプレス製のアンギュラ玉軸受を車輪用軸受として使用した場合、車両の旋回時等に負荷されるモーメント荷重によって、ボール５６の接触楕円が乗り上げて外側転走面５１ｂから外れる、所謂肩乗り上げが発生することがある。そして、この肩乗り上げによって肩部Ａにエッジロードが発生する恐れがあった。ここで、エッジロードとは、角部等に発生する過大な応力集中のことで、早期剥離の要因の一つとなる事象を言う。   However, when this type of angular contact ball bearing made of a press is used as a wheel bearing, the so-called contact ellipse of the ball 56 rides up and disengages from the outer rolling surface 51b due to a moment load applied when the vehicle turns or the like. Shoulder climb may occur. Then, there is a fear that edge loading may occur in the shoulder A due to the riding on the shoulder. Here, the edge load is an excessive stress concentration generated at a corner or the like, and refers to an event that becomes one of the factors of early peeling.

そこで、外側転走面５１ｂの溝底から環状凸部５１ａまでの肩高さを高くすれば旋回モーメント負荷時にボール５６の接触楕円が肩部Ａを乗り上げるのを防止できるが、肩高さを高くすると絞り率が高くなり肩部Ａに亀裂が発生する恐れがあるため、適切な肩高さを確保するために、外輪５１のローリング加工時、外輪５１の中央部を凹ませて肩部Ａに素材を充足させるようにしている。   Therefore, if the shoulder height from the groove bottom of the outer rolling surface 51b to the annular convex portion 51a is increased, the contact ellipse of the ball 56 can be prevented from climbing over the shoulder A when a turning moment is applied, but the shoulder height is increased. Then, there is a possibility that the squeezing ratio becomes high and cracks may occur in the shoulder A. Therefore, in order to secure an appropriate shoulder height, the center portion of the outer ring 51 is recessed to the shoulder A when the outer ring 51 is rolled. I try to satisfy the material.

一方、軸受精度を高めるために外側転走面５１ｂを研削加工した場合、肩部Ａにエッジが発生してボール５６の接触楕円がこの肩部Ａのエッジに乗り上げる恐れがあった。これにより、肩部Ａにエッジロードが発生して軸受の寿命低下を招来させることがあった。   On the other hand, when the outer rolling surface 51b is ground in order to improve the bearing accuracy, an edge is generated in the shoulder A, and the contact ellipse of the ball 56 may run on the edge of the shoulder A. As a result, an edge load may occur in the shoulder A, leading to a reduction in bearing life.

本発明は、このような事情に鑑みてなされたもので、軽量・コンパクト化と低コスト化を図ると共に、軸受の耐久性の向上を図った車輪用軸受およびこれを備えた車輪用軸受装置を提供することを目的としている。   SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a wheel bearing and a wheel bearing device including the wheel bearing that are designed to be lighter, more compact and lower in cost and to improve the durability of the bearing. It is intended to provide.

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、内周に複列の円弧状の外側転走面が一体に形成された外方部材と、外周に前記複列の外側転走面に対向する円弧状の内側転走面が形成された一対の内輪と、これら内輪と前記外方部材の両転走面間に収容された複列のボールとを備え、前記内輪の小径側端面が突合せ状態で衝合して背面合せタイプの複列のアンギュラ玉軸受を構成する車輪用軸受において、前記外方部材と内輪がパイプ材からローリング加工によって形成され、前記外方部材の中央部を凹ませて内周に環状凸部がフラット形状に形成されると共に、前記外側転走面から前記環状凸部に繋がる肩部が、総型砥石によって前記外側転走面と同時に研削加工され、円弧状に形成され、前記環状凸部の内径が、ローリング加工によって前記肩部と微小な段差をもって形成されている。
In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and the double-row on the outer periphery. A pair of inner rings formed with an arcuate inner rolling surface facing the outer rolling surface, and a double row of balls accommodated between the inner ring and both rolling surfaces of the outer member, the inner ring In the wheel bearing that constitutes a back-to-back type double row angular contact ball bearing by abutting the end surfaces on the small diameter side in a butted state, the outer member and the inner ring are formed from a pipe material by rolling, and the outer member An annular convex portion is formed in a flat shape on the inner periphery with the central portion of the outer surface being recessed, and a shoulder portion connected to the annular convex portion from the outer rolling surface is ground simultaneously with the outer rolling surface by a general grindstone. is processed, it is formed in a circular arc shape, the inner diameter of the annular convex portion, Lorin It is formed with a minute step and said shoulder portion by machining.

このように、背面合せタイプの複列のアンギュラ玉軸受で構成された車輪用軸受において、外方部材と内輪がパイプ材からローリング加工によって形成され、外方部材の中央部を凹ませて内周に環状凸部がフラット形状に形成されると共に、外側転走面から環状凸部に繋がる肩部が、総型砥石によって外側転走面と同時に研削加工され、円弧状に形成され、環状凸部の内径が、ローリング加工によって肩部と微小な段差をもって形成されているので、所望の軸受精度を確保して肩部に亀裂が発生するのを防止すると共に、肩部が外側転走面から滑らかに繋がり、肩部に素材を充足させて外側転走面と環状凸部との肩高さを適切に確保することができ、旋回モーメント負荷時にボールの接触楕円が肩部を乗り上げてエッジロードが発生するのを防止することができ、軸受の耐久性を向上させた車輪用軸受を提供することができる。
In this way, in the wheel bearing constituted by the back-to-back type double row angular contact ball bearings, the outer member and the inner ring are formed by rolling from the pipe material, and the central part of the outer member is recessed to the inner periphery. an annular convex portion is formed in a flat shape, a shoulder portion leading from the outer raceway surfaces on the annular convex portion, is simultaneously grinding the outer raceway surfaces by forming grindstone, it is formed in a circular arc shape, the annular projection The inner diameter of the shoulder is formed with a small step from the shoulder by rolling processing , ensuring the desired bearing accuracy and preventing the shoulder from cracking, and the shoulder is smooth from the outer rolling surface The shoulder can be filled with material to ensure the appropriate shoulder height between the outer rolling surface and the annular convex part. To occur Can be stopped, it is possible to provide a wheel bearing with an improved durability of the bearing.

また、本発明のうち請求項２に記載の発明は、内周に複列の円弧状の外側転走面が一体に形成された外方部材と、外周に前記複列の外側転走面に対向する円弧状の内側転走面が形成された一対の内輪と、これら内輪と前記外方部材の両転走面間に収容された複列のボールとを備え、前記内輪の小径側端面が突合せ状態で衝合して背面合せタイプの複列のアンギュラ玉軸受を構成する車輪用軸受において、前記外方部材と内輪がパイプ材からローリング加工によって形成され、前記外方部材の中央部を凹ませて内周に環状凸部がフラット形状に形成され、前記外方部材の両端面と前記内輪の大径側端面がローリング加工後に旋削加工されると共に、当該外方部材の外径面および内輪の内径面と小径側端面が研削加工によって所定の寸法、精度に形成されると共に、前記外側転走面から前記環状凸部に繋がる肩部が、総型砥石によって前記外側転走面と同時に研削加工され、円弧状に形成されているので、所望の軸受精度を確保して肩部に亀裂が発生するのを防止すると共に、肩部が外側転走面から滑らかに繋がり、旋回モーメント負荷時にボールの接触楕円が肩部を乗り上げてエッジロードが発生するのを防止することができ、軸受の耐久性を向上させることができる。また、従来の鍛造、削り出しの軸受と同等の軸受精度を確保することができる。The invention according to claim 2 of the present invention includes an outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and an outer rolling surface of the double-row on the outer periphery. A pair of inner rings formed with opposing arc-shaped inner rolling surfaces, and a double row of balls accommodated between the inner rings and both rolling surfaces of the outer member; In a wheel bearing that forms a back-to-back type double row angular contact ball bearing by abutting in a butted state, the outer member and the inner ring are formed by rolling from a pipe material, and the central portion of the outer member is recessed. Further, an annular convex portion is formed in a flat shape on the inner periphery, and both end surfaces of the outer member and the large-diameter side end surface of the inner ring are turned after rolling, and the outer diameter surface and inner ring of the outer member are also turned. The inner diameter surface and the end surface on the small diameter side are ground to the specified dimensions and accuracy. Since the shoulder portion connected to the annular convex portion from the outer rolling surface is ground simultaneously with the outer rolling surface by a general-purpose grindstone and is formed in an arc shape, a desired bearing accuracy can be obtained. To prevent the shoulder from cracking, and the shoulder smoothly connects from the outer rolling surface, preventing the ball contact ellipse from climbing over the shoulder and causing edge load when a turning moment is applied. The durability of the bearing can be improved. Moreover, the bearing accuracy equivalent to that of a conventional forged and machined bearing can be ensured.

また、請求項３に記載の発明のように、前記複列の外側転走面が総型砥石によって同時に研削加工されていれば、加工工数が削減でき、低コスト化を図ることができると共に、複列の外側転走面の溝径相互差およびピッチを所定の精度に規制することができ、軸受精度を一層向上させることができる。   In addition, as in the invention according to claim 3, if the outer rolling surfaces of the double row are simultaneously ground by a general-purpose grindstone, the number of processing steps can be reduced, and the cost can be reduced. The groove diameter difference and pitch of the double row outer raceway can be regulated to a predetermined accuracy, and the bearing accuracy can be further improved.

また、本発明のうち請求項４に記載の発明は、一端部に車輪取付フランジを一体に有し、この車輪取付フランジから肩部を介して軸方向に延びる小径段部が形成されたハブ輪と、このハブ輪の小径段部に所定のシメシロを介して圧入された前記請求項１乃至３いずれかに車輪用軸受とを備え、前記ハブ輪に等速自在継手の外側継手部材がセレーションを介して内嵌され、前記一対の内輪が前記ハブ輪の肩部と前記外側継手部材の肩部とで挟持され、所定の軸受予圧が付与されている。
According to a fourth aspect of the present invention, the wheel according to claim 4 has a wheel mounting flange integrally formed at one end, and a hub wheel formed with a small-diameter stepped portion extending in the axial direction from the wheel mounting flange via the shoulder. And a wheel bearing according to any one of claims 1 to 3 that is press-fitted into the small-diameter step portion of the hub wheel through a predetermined shimiro, and the outer joint member of the constant velocity universal joint is serrated on the hub wheel. And the pair of inner rings are sandwiched between a shoulder portion of the hub wheel and a shoulder portion of the outer joint member, and a predetermined bearing preload is applied.

このように、第１世代構造の車輪用軸受装置において、一端部に車輪取付フランジを一体に有し、この車輪取付フランジから肩部を介して軸方向に延びる小径段部が形成されたハブ輪と、このハブ輪の小径段部に所定のシメシロを介して圧入された前記請求項１乃至４いずれかに車輪用軸受とを備え、前記ハブ輪に等速自在継手の外側継手部材がセレーションを介して内嵌され、前記一対の内輪が前記ハブ輪の肩部と前記外側継手部材の肩部とで挟持され、所定の軸受予圧が付与されているので、軸受剛性が高くなると共に、軸受の転がり疲労寿命が向上する。   Thus, in the wheel bearing device of the first generation structure, a hub wheel having a wheel mounting flange integrally formed at one end and a small-diameter step portion extending in the axial direction from the wheel mounting flange via the shoulder is formed. And a wheel bearing according to any one of claims 1 to 4, which is press-fitted into the small-diameter step portion of the hub wheel via a predetermined shimiro, and the outer joint member of the constant velocity universal joint serrated on the hub wheel. And the pair of inner rings are sandwiched between the shoulder part of the hub wheel and the shoulder part of the outer joint member, and a predetermined bearing preload is applied. Rolling fatigue life is improved.

本発明に係る車輪用軸受は、内周に複列の円弧状の外側転走面が一体に形成された外方部材と、外周に前記複列の外側転走面に対向する円弧状の内側転走面が形成された一対の内輪と、これら内輪と前記外方部材の両転走面間に収容された複列のボールとを備え、前記内輪の小径側端面が突合せ状態で衝合して背面合せタイプの複列のアンギュラ玉軸受を構成する車輪用軸受において、前記外方部材と内輪がパイプ材からローリング加工によって形成され、前記外方部材の中央部を凹ませて内周に環状凸部がフラット形状に形成されると共に、前記外側転走面から前記環状凸部に繋がる肩部が、総型砥石によって前記外側転走面と同時に研削加工され、円弧状に形成され、前記環状凸部の内径が、ローリング加工によって前記肩部と微小な段差をもって形成されているので、所望の軸受精度を確保して肩部に亀裂が発生するのを防止すると共に、肩部が外側転走面から滑らかに繋がり、肩部に素材を充足させて外側転走面と環状凸部との肩高さを適切に確保することができ、旋回モーメント負荷時にボールの接触楕円が肩部を乗り上げてエッジロードが発生するのを防止することができ、軸受の耐久性を向上させた車輪用軸受を提供することができる。
また、本発明に係る車輪用軸受は、内周に複列の円弧状の外側転走面が一体に形成された外方部材と、外周に前記複列の外側転走面に対向する円弧状の内側転走面が形成された一対の内輪と、これら内輪と前記外方部材の両転走面間に収容された複列のボールとを備え、前記内輪の小径側端面が突合せ状態で衝合して背面合せタイプの複列のアンギュラ玉軸受を構成する車輪用軸受において、前記外方部材と内輪がパイプ材からローリング加工によって形成され、前記外方部材の中央部を凹ませて内周に環状凸部がフラット形状に形成され、前記外方部材の両端面と前記内輪の大径側端面がローリング加工後に旋削加工されると共に、当該外方部材の外径面および内輪の内径面と小径側端面が研削加工によって所定の寸法、精度に形成されると共に、前記外側転走面から前記環状凸部に繋がる肩部が、総型砥石によって前記外側転走面と同時に研削加工され、円弧状に形成されているので、所望の軸受精度を確保して肩部に亀裂が発生するのを防止すると共に、肩部が外側転走面から滑らかに繋がり、旋回モーメント負荷時にボールの接触楕円が肩部を乗り上げてエッジロードが発生するのを防止することができ、軸受の耐久性を向上させることができる。また、従来の鍛造、削り出しの軸受と同等の軸受精度を確保することができる。 The wheel bearing according to the present invention includes an outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and an arc-shaped inner surface facing the outer-rolling surface of the double-row on the outer periphery. A pair of inner rings formed with rolling surfaces, and a double row of balls accommodated between the inner rings and both rolling surfaces of the outer member, the end surfaces on the small diameter side of the inner ring abut each other in a butted state. In the wheel bearing constituting the back-to-back type double row angular contact ball bearing, the outer member and the inner ring are formed by rolling from a pipe material, and the central part of the outer member is recessed and annular on the inner periphery. with the convex portion is formed in a flat shape, the shoulder portion from the outer raceway surfaces leading to the annular convex portion, is simultaneously grinding and the outer raceway surfaces by forming grindstone, is formed in a circular arc shape, the annular The inner diameter of the convex part is slightly stepped from the shoulder part by rolling. Because it is formed with, as well as prevent cracking from occurring in the shoulder portion to secure the desired bearing precision, smooth connection shoulders from the outer rolling surface, the outer rolling by satisfying the material in the shoulder portion The shoulder height between the running surface and the ring-shaped convex part can be secured appropriately, and the contact ellipse of the ball can ride on the shoulder part when a turning moment is applied, preventing edge load from occurring, and the durability of the bearing It is possible to provide a wheel bearing with improved performance.
Further, the wheel bearing according to the present invention includes an outer member in which a double row arc-shaped outer rolling surface is integrally formed on the inner periphery, and an arc shape facing the outer surface of the double row on the outer periphery. A pair of inner rings formed with inner rolling surfaces of the inner ring, and a double row of balls accommodated between the inner rings and the rolling surfaces of the outer member. In the wheel bearing constituting the back-to-back type double row angular contact ball bearing, the outer member and the inner ring are formed by rolling from a pipe material, and the inner part is recessed by recessing the central part of the outer member. An annular convex portion is formed in a flat shape, both end surfaces of the outer member and the large-diameter side end surface of the inner ring are turned after rolling, and the outer surface of the outer member and the inner surface of the inner ring The end face on the small diameter side is formed with the specified dimensions and accuracy by grinding. In both cases, the shoulder connecting from the outer rolling surface to the annular convex portion is ground simultaneously with the outer rolling surface by a general-purpose grindstone and is formed in an arc shape, so that the desired bearing accuracy is ensured. It prevents the shoulder from cracking, and the shoulder connects smoothly from the outer rolling surface, preventing the ball contact ellipse from climbing over the shoulder when a turning moment is applied and causing edge loading. The durability of the bearing can be improved. Moreover, the bearing accuracy equivalent to that of a conventional forged and machined bearing can be ensured.

内周に複列の円弧状の外側転走面が一体に形成された外方部材と、外周に前記複列の外側転走面に対向する円弧状の内側転走面が形成された一対の内輪と、これら内輪と前記外方部材の両転走面間に収容された複列のボールとを備え、前記内輪の小径側端面が突合せ状態で衝合して背面合せタイプの複列のアンギュラ玉軸受を構成する車輪用軸受において、前記外方部材と内輪がパイプ材からローリング加工によって形成され、前記外方部材の中央部を凹ませて内周に環状凸部がフラット形状に、かつこの環状凸部の内径が、前記外側転走面から前記環状凸部に繋がる肩部より微小な段差をもって形成されると共に、当該肩部が、総型砥石によって前記外側転走面と同時に研削加工され、円弧状に形成されている。   A pair of outer members in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and an arc-shaped inner rolling surface facing the outer-rolling surface of the double-row is formed on the outer periphery. A back-to-back type double row angular contact comprising an inner ring and a double row of balls accommodated between both rolling surfaces of the inner ring and the outer member, wherein the end faces on the small diameter side of the inner ring abut each other in a butted state. In the wheel bearing constituting the ball bearing, the outer member and the inner ring are formed by rolling from a pipe material, the central portion of the outer member is recessed, and the annular convex portion is formed in a flat shape on the inner periphery. The inner diameter of the annular convex portion is formed with a minute step from the shoulder connected to the annular convex portion from the outer rolling surface, and the shoulder portion is ground simultaneously with the outer rolling surface by a general-purpose grindstone. It is formed in an arc shape.

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、本発明に係る車輪用軸受装置の一実施形態を示す縦断面図、図２は、図１の車輪用軸受を示す拡大図、図３（ａ）は図２の外方部材単体を示す縦断面図、（ｂ）は、図２の内輪単体を示す縦断面図、図４（ａ）は、外方部材における外側転走面の研削加工を示す説明図、（ｂ）は、同上、他の研削加工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.
1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, FIG. 2 is an enlarged view showing the wheel bearing of FIG. 1, and FIG. 3 (a) is a single outer member of FIG. FIG. 4B is a longitudinal sectional view showing the single inner ring of FIG. 2, FIG. 4A is an explanatory view showing grinding of the outer rolling surface of the outer member, and FIG. It is explanatory drawing which shows another grinding process same as the above. 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).

この車輪用軸受装置は第１世代構造をなし、ハブ輪１と、このハブ輪１に装着される車輪用軸受２とを備えている。ハブ輪１には等速自在継手３がトルク伝達自在に内嵌され、固定ナット４を介してハブ輪１と等速自在継手３が分離可能に一体化されている。   This wheel bearing device has a first generation structure, and includes a hub wheel 1 and a wheel bearing 2 attached to the hub wheel 1. A constant velocity universal joint 3 is fitted into the hub wheel 1 so as to be able to transmit torque, and the hub wheel 1 and the constant velocity universal joint 3 are detachably integrated via a fixing nut 4.

ハブ輪１は、アウター側の一端部に車輪（図示せず）を取り付けるための車輪取付フランジ５を有し、外周にこの車輪取付フランジ５から肩部１ａを介して軸方向に延びる円筒状の小径段部１ｂ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）１ｃが形成されている。このハブ輪１はＳ５３Ｃ等の炭素０．４０〜０．８０ｗｔ％を含む中高炭素鋼で形成され、鍛造の生のままである。また、曲げ強度に対する疲労強度増加のために鍛造後に調質処理を行う方法や、肩部１ａ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の範囲に硬化処理をしても良い。   The hub wheel 1 has a wheel mounting flange 5 for mounting a wheel (not shown) at one end portion on the outer side, and a cylindrical shape extending from the wheel mounting flange 5 to the outer periphery in the axial direction via a shoulder portion 1a. A small-diameter step portion 1b is formed, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. The hub wheel 1 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and remains as forged. In addition, a method of performing a tempering treatment after forging in order to increase the fatigue strength with respect to the bending strength, or by subjecting the surface hardness to a range of 58 to 64 HRC by induction hardening from the shoulder portion 1a to the small diameter step portion 1b. May be.

車輪用軸受２はナックル６に内嵌され、図２に拡大して示すように、内周に複列の円弧状の外側転走面７ａ、７ａが形成された外方部材（外輪）７と、外周にこれら複列の外側転走面７ａ、７ａに対向する円弧状の内側転走面８ａ、８ａが形成された一対の内輪８、８と、両転走面間に保持器９、９を介して転動自在に収容された複列のボール１０、１０と、外方部材７の両端部に装着されたシール１１とを備えている。そして、内輪８、８の小径（正面）側端面８ｂ、８ｂを突合せ状態で衝合し、所謂背面合せタイプの複列のアンギュラ玉軸受を構成している。   The wheel bearing 2 is fitted into a knuckle 6, and as shown in an enlarged view in FIG. 2, an outer member (outer ring) 7 in which double-row arc-shaped outer rolling surfaces 7a and 7a are formed on the inner periphery. A pair of inner rings 8 and 8 having arcuate inner rolling surfaces 8a and 8a formed on the outer periphery and facing these double-row outer rolling surfaces 7a and 7a, and cages 9 and 9 between both rolling surfaces. And the double-row balls 10 and 10 accommodated so as to be freely rollable via each other, and the seals 11 attached to both ends of the outer member 7. The small diameter (front) side end faces 8b, 8b of the inner rings 8, 8 are abutted in a butted state to constitute a so-called back-to-back type double row angular ball bearing.

シール１１は、外方部材７の円筒部１３に嵌合される芯金１１ａと、この芯金１１ａに加硫接着等により一体に接合され、ニトリルゴム等のエラストマーからなるシール部材１１ｂからなり、一対のラジアルリップを備えている。そして、軸受内部に封入されたグリースの漏洩と、外部から雨水やダスト等の異物が軸受内部に侵入するのを防止している。また、図示していないが、内輪外径にスリンガを圧入し、このスリンガに対向して外方部材７の円筒部１３に装着されたシールとからなり、このシールのシールリップが摺接した所謂パックシールを用いても良い。   The seal 11 is composed of a core metal 11a fitted to the cylindrical portion 13 of the outer member 7, and a seal member 11b integrally joined to the core metal 11a by vulcanization adhesion or the like, and made of an elastomer such as nitrile rubber, It has a pair of radial lips. In addition, leakage of grease sealed in the bearing and foreign matter such as rainwater and dust from the outside are prevented from entering the bearing. Although not shown, a slinger is press-fitted into the outer diameter of the inner ring, and a seal is mounted on the cylindrical portion 13 of the outer member 7 so as to face the slinger. A pack seal may be used.

等速自在継手３は、図１に示すように、外側継手部材１５と、継手内輪１６とケージ１７およびトルク伝達ボール１８とを備えている。外側継手部材１５は、カップ状のマウス部１９と、このマウス部１９の底部となる肩部２０と、この肩部２０から軸方向に延びる軸部２１を一体に有している。軸部２１の外周にはハブ輪１のセレーション１ｃに係合するセレーション２１ａと、このセレーション２１ａの端部に雄ねじ２１ｂが形成されている。そして、肩部２０が内輪８の大端面と衝合するまでハブ輪１に外側継手部材１５がセレーション１ｃ、２１ａを介して内嵌され、一対の内輪８、８がハブ輪１の肩部１ａと外側継手部材１５の肩部２０に挟持された状態でハブ輪１の小径段部１ｂに所定のシメシロを介して圧入されている。さらに、雄ねじ２１ｂに固定ナット４を所定の締付トルクで緊締することにより所定の軸受予圧が付与されている。これにより、軸受剛性が高くなると共に、軸受の転がり疲労寿命が向上する。   As shown in FIG. 1, the constant velocity universal joint 3 includes an outer joint member 15, a joint inner ring 16, a cage 17, and a torque transmission ball 18. The outer joint member 15 integrally includes a cup-shaped mouth portion 19, a shoulder portion 20 that is a bottom portion of the mouth portion 19, and a shaft portion 21 that extends from the shoulder portion 20 in the axial direction. A serration 21a that engages with the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 21, and a male screw 21b is formed at the end of the serration 21a. The outer joint member 15 is fitted into the hub wheel 1 via the serrations 1c and 21a until the shoulder 20 abuts the large end surface of the inner ring 8, and the pair of inner rings 8 and 8 is the shoulder 1a of the hub ring 1. The outer joint member 15 is press-fitted into the small-diameter step portion 1b of the hub wheel 1 through a predetermined squeeze while being sandwiched between the shoulder portions 20 of the outer joint member 15. Further, a predetermined bearing preload is applied to the male screw 21b by tightening the fixing nut 4 with a predetermined tightening torque. As a result, the bearing rigidity is increased and the rolling fatigue life of the bearing is improved.

ここで、外方部材７および内輪８は、ＳＵＪ２等の軸受鋼やＳＣｒ４２０およびＳＣＭ４１５等の浸炭鋼からなるパイプ材を冷間のローリング加工によって形成されている。そして、ＳＵＪ２はズブ焼や高周波焼入れ、浸炭鋼は浸炭焼入れによって表面硬さを５０〜６４ＨＲＣの範囲に硬化処理されている。外方部材７および内輪８の材質としてこれ以外にも、ＳＣＭ４４０や冷間圧延鋼鈑（ＪＩＳ規格のＳＰＣＣ系等）やＳ５３Ｃ等の炭素鋼を例示することができる。冷間圧延鋼鈑や炭素鋼の場合、少なくとも外方部材７においては複列の外側転走面７ａ、７ａが、また、内輪８においては内側転走面８ａが高周波焼入れによって表面硬さを５０〜６４ＨＲＣの範囲に硬化処理が施され、転がり疲労寿命を向上させている。そして、これらの転走面７ａ、８ａは、研削加工によって所定の寸法、精度に形成されている。なお、その後、必要に応じて超仕上げ加工が施される。   Here, the outer member 7 and the inner ring 8 are formed by cold rolling a pipe material made of bearing steel such as SUJ2 or carburized steel such as SCr420 and SCM415. Then, SUJ2 is hardened to a surface hardness of 50 to 64 HRC by submerged or induction hardening, and carburized steel is carburized and quenched. Other examples of the material of the outer member 7 and the inner ring 8 include carbon steel such as SCM440, cold rolled steel plate (JIS standard SPCC system, etc.), S53C, and the like. In the case of cold rolled steel or carbon steel, at least the outer member 7 has double-row outer rolling surfaces 7a and 7a, and in the inner ring 8, the inner rolling surface 8a has a surface hardness of 50 by induction hardening. A hardening treatment is applied in a range of ˜64 HRC to improve the rolling fatigue life. These rolling surfaces 7a and 8a are formed with predetermined dimensions and accuracy by grinding. After that, superfinishing is performed as necessary.

次に、図３を用いて、外方部材７および内輪８の構成について詳細に説明する。
外方部材７は、（ａ）に示すように、素材となるパイプ材から冷間のローリング加工により、内周に径方向内方に突出する環状凸部１２と、この環状凸部１２の両側に複列の円弧状の外側転走面７ａ、７ａが形成されると共に、両端部にシール１１の嵌合部となる円筒部１３、１３が形成される。そして、後述する複列の外側転走面７ａ、７ａをはじめ、この円筒部１３は、冷間のローリング加工後に研削加工によって所定の寸法、精度に形成される。なお、ローリング加工でバリが発生する両端面はローリング加工後に旋削加工される。また、必要に応じて研削加工が施される。 Next, the configuration of the outer member 7 and the inner ring 8 will be described in detail with reference to FIG.
The outer member 7 includes, as shown in (a), an annular protrusion 12 that protrudes radially inward from the pipe material that is the raw material by cold rolling, and both sides of the annular protrusion 12. In addition, double-row arc-shaped outer rolling surfaces 7a and 7a are formed, and cylindrical portions 13 and 13 serving as fitting portions of the seal 11 are formed at both ends. And this cylindrical part 13 including the double row outer side rolling surfaces 7a and 7a mentioned later is formed with a predetermined | prescribed dimension and precision by grinding after cold rolling. Note that both end surfaces where burrs are generated in the rolling process are turned after the rolling process. Moreover, a grinding process is given as needed.

ここで、外側転走面７ａから環状凸部１２の肩高さを適切に確保するために、外方部材７のローリング加工時、環状凸部１２の内径をフラット形状に形成すると共に、外方部材７の中央部を凹ませて肩部２２に素材を充足させるようにしている。   Here, in order to appropriately secure the shoulder height of the annular convex portion 12 from the outer rolling surface 7a, the inner diameter of the annular convex portion 12 is formed in a flat shape during the rolling process of the outer member 7, and the outer side The central portion of the member 7 is recessed so that the shoulder portion 22 is filled with the material.

一方、内輪８は、（ｂ）に示すように、素材となるパイプ材から冷間のローリング加工により、外周に円弧状の内側転走面８ａと、この内側転走面８ａから軸方向に延びる肩部１４が形成される。ここで、この肩部１４はシール１１のシールランド部となり、冷間のローリング加工後に内側転走面８ａと同時に研削加工され、所定の寸法、精度に形成される。なお、外方部材７と同様、ローリング加工でバリが発生する両端面はローリング加工後に旋削加工される。また、必要に応じて研削加工が施される。   On the other hand, as shown in (b), the inner ring 8 has an arcuate inner raceway surface 8a on the outer periphery and extends in the axial direction from the inner raceway surface 8a by cold rolling from a pipe material as a raw material. A shoulder 14 is formed. Here, the shoulder portion 14 becomes a seal land portion of the seal 11 and is ground at the same time as the inner rolling surface 8a after cold rolling, and is formed with a predetermined size and accuracy. As with the outer member 7, both end surfaces where burrs are generated in the rolling process are turned after the rolling process. Moreover, a grinding process is given as needed.

本実施形態では、外方部材７および内輪８がパイプ材から冷間のローリング加工で形成されると共に、両転走面７ａ、８ａとシール１１の嵌合面となる外方部材７の円筒部１３、およびシール１１のランド部となる内輪８の肩部１４が研削加工によって形成されているので、生産性が向上して歩溜まりが良く、また、低コスト化ができると共に、従来の軸受と同等の精度や密封性を確保することができる。   In this embodiment, the outer member 7 and the inner ring 8 are formed by cold rolling from a pipe material, and the cylindrical portion of the outer member 7 that serves as a fitting surface between the rolling surfaces 7 a and 8 a and the seal 11. 13 and the shoulder portion 14 of the inner ring 8 that becomes the land portion of the seal 11 are formed by grinding, so that the productivity is improved, the yield is good, the cost can be reduced, and the conventional bearing Equivalent accuracy and sealing performance can be ensured.

ここで、図４（ａ）に示すように、外側転走面７ａから環状凸部１２に繋がる肩部２２が、熱処理後に総型砥石２３によって外側転走面７ａと同時に研削加工されている（ローリング加工後の肩部２２を図中二点鎖線にて示す）。すなわち、この総型砥石２３は、環状凸部１２を避けて小径に成形された小径部２３ａと、外側転走面７ａに対応する溝２３ｂと、肩部２２に対応する角部２３ｃが、予めロータリドレッサによって成形されている。そして、角部２３ｃは所定の曲率半径Ｒからなる円弧状に形成され、溝部２３ｂから滑らかに繋がっている。これにより、所望の軸受精度を確保すると共に、肩部２２に亀裂が発生するのを防止し、かつ、旋回モーメント負荷時にボール１０の接触楕円が肩部２２を乗り上げてエッジロードが発生するのを防止することができ、軸受の耐久性を向上させた車輪用軸受２を提供することができる。   Here, as shown in FIG. 4 (a), the shoulder 22 connected from the outer rolling surface 7a to the annular convex portion 12 is ground simultaneously with the outer rolling surface 7a by the general-purpose grindstone 23 after the heat treatment ( The shoulder 22 after the rolling process is indicated by a two-dot chain line in the figure). That is, the general-purpose grindstone 23 has a small-diameter portion 23a formed to have a small diameter avoiding the annular convex portion 12, a groove 23b corresponding to the outer rolling surface 7a, and a corner portion 23c corresponding to the shoulder portion 22 in advance. It is molded by a rotary dresser. And the corner | angular part 23c is formed in the circular arc shape which consists of predetermined | prescribed curvature radius R, and is connected smoothly from the groove part 23b. This ensures the desired bearing accuracy, prevents the shoulder 22 from cracking, and prevents the contact ellipse of the ball 10 from climbing over the shoulder 22 when a turning moment is applied, causing an edge load. It is possible to provide the wheel bearing 2 that can be prevented and the durability of the bearing is improved.

なお、図示はしないが、総型砥石２３に複列の外側転走面７ａ、７ａに対応する複列の溝部２３ｂ、２３ｂを形成し、複列の外側転走面７ａ、７ａとそれぞれの肩部２２を同時に研削加工するようにしても良い。これにより、加工工数が削減でき、低コスト化を図ることができると共に、複列の外側転走面７ａ、７ａの溝径相互差およびピッチ（溝間距離）等を所定の精度に規制することができ、軸受精度を一層向上させることができる。   Although not shown, double-row grooves 23b and 23b corresponding to double-row outer rolling surfaces 7a and 7a are formed in the general-purpose grindstone 23, and the double-row outer rolling surfaces 7a and 7a and their respective shoulders are formed. You may make it grind the part 22 simultaneously. As a result, the number of processing steps can be reduced, the cost can be reduced, and the groove diameter difference and pitch (inter-groove distance) of the double row outer rolling surfaces 7a, 7a can be regulated to a predetermined accuracy. The bearing accuracy can be further improved.

図４（ｂ）は、（ａ）の変形例を示している。この外方部材２４における環状凸部２５の内径は、ローリング加工によって肩部２６と微小な段差δをもって形成されている。そして、肩部２６が、熱処理後に総型砥石２７によって外側転走面７ａと同時に研削加工されている。この総型砥石２７は、環状凸部２５を避けて小径に成形された小径部２７ａと、外側転走面７ａに対応する溝２７ｂと、肩部２６に対応する角部２７ｃが、予めロータリドレッサによって成形されている。角部２７ｃは所定の曲率半径Ｒからなる円弧状に形成され、溝部２７ｂから小径部２７ａに滑らかに繋がっている。これにより、ローリング加工時に、肩部２６に亀裂が発生するのを防止しつつ、肩部２６に素材を充足させて外側転走面７ａと環状凸部２５との肩高さを適切に確保すると共に、肩部２６のエッジを無くして旋回モーメント負荷時にボール１０の接触楕円が肩部２６を乗り上げてエッジロードが発生するのを防止することができる。   FIG. 4B shows a modified example of FIG. The inner diameter of the annular protrusion 25 in the outer member 24 is formed with a shoulder 26 and a minute step δ by rolling. And the shoulder part 26 is ground simultaneously with the outer side rolling surface 7a by the total type grindstone 27 after heat processing. In this general-purpose grindstone 27, a small-diameter portion 27a formed to have a small diameter while avoiding the annular convex portion 25, a groove 27b corresponding to the outer rolling surface 7a, and a corner portion 27c corresponding to the shoulder portion 26 have a rotary dresser in advance. Is molded by. The corner portion 27c is formed in an arc shape having a predetermined curvature radius R, and is smoothly connected from the groove portion 27b to the small diameter portion 27a. Thereby, at the time of a rolling process, while preventing a crack from generating in the shoulder part 26, the shoulder part 26 is filled with a raw material, and the shoulder height of the outer side rolling surface 7a and the annular convex part 25 is ensured appropriately. At the same time, the edge of the shoulder portion 26 can be eliminated to prevent the contact ellipse of the ball 10 from riding on the shoulder portion 26 when a turning moment is applied, thereby preventing an edge load from occurring.

なお、ここでは、外方部材７（２４）と内輪８を冷間のローリング加工によって形成したが、これに限らず、温間のローリング加工によって形成しても良く、また、ナックル６やハブ輪１の嵌合面となる外方部材７の外径面および内輪８の内径面、さらには突合せ面となる内輪８の小径側端面８ｂを研削加工によって形成しても良い。これにより、従来の鍛造、削り出しの軸受と同等の軸受精度を確保することができる。   Here, the outer member 7 (24) and the inner ring 8 are formed by cold rolling, but the present invention is not limited to this, and the outer member 7 (24) and the inner ring 8 may be formed by warm rolling. The outer diameter surface of the outer member 7 serving as one fitting surface, the inner diameter surface of the inner ring 8, and the end surface 8b on the small diameter side of the inner ring 8 serving as a butting surface may be formed by grinding. Thereby, the bearing accuracy equivalent to the conventional forged and machined bearing can be ensured.

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、一端部に車輪取付フランジを一体に有するハブ輪と、このハブ輪に圧入された一対の内輪とを備えた第１世代構造の車輪用軸受装置に適用できる。   The wheel bearing device according to the present invention can be applied to a wheel bearing device having a first generation structure including a hub wheel integrally having a wheel mounting flange at one end and a pair of inner rings press-fitted into the hub wheel. .

本発明に係る車輪用軸受装置の一実施形態を示す縦断面図である。It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. 図１の車輪用軸受を示す拡大図である。It is an enlarged view which shows the wheel bearing of FIG. （ａ）は、図２の外方部材輪単体を示す縦断面図である。 （ｂ）は、同上、内輪単体を示す縦断面図である。(A) is a longitudinal cross-sectional view which shows the outer member ring single-piece | unit of FIG. (B) is the longitudinal cross-sectional view which shows an inner ring single-piece | unit as above. （ａ）は、外方部材の研削加工を示す説明図である。 （ｂ）は、（ａ）の変形例を示す説明図である。(A) is explanatory drawing which shows the grinding process of an outer member. (B) is explanatory drawing which shows the modification of (a). 従来の内・外輪がプレス加工によって形成された構造のアンギュラ玉軸受を示す縦断面図である。It is a longitudinal cross-sectional view which shows the angular contact ball bearing of the structure where the conventional inner and outer ring | wheel was formed by press work.

符号の説明Explanation of symbols

１・・・・・・・・・・・・・・・・ハブ輪
１ａ、１４、２０、２２、２６・・・肩部
１ｂ・・・・・・・・・・・・・・・小径段部
１ｃ、２１ａ・・・・・・・・・・・セレーション
２・・・・・・・・・・・・・・・・車輪用軸受
３・・・・・・・・・・・・・・・・等速自在継手
４・・・・・・・・・・・・・・・・固定ナット
５・・・・・・・・・・・・・・・・車輪取付フランジ
６・・・・・・・・・・・・・・・・ナックル
７、２４・・・・・・・・・・・・・外方部材
７ａ・・・・・・・・・・・・・・・外側転走面
８・・・・・・・・・・・・・・・・内輪
８ａ・・・・・・・・・・・・・・・内側転走面
８ｂ・・・・・・・・・・・・・・・小径側端面
９・・・・・・・・・・・・・・・・保持器
１０・・・・・・・・・・・・・・・ボール
１１・・・・・・・・・・・・・・・シール
１１ａ・・・・・・・・・・・・・・芯金
１１ｂ・・・・・・・・・・・・・・シール部材
１２、２５・・・・・・・・・・・・環状凸部
１３・・・・・・・・・・・・・・・円筒部
１５・・・・・・・・・・・・・・・外側継手部材
１６・・・・・・・・・・・・・・・継手内輪
１７・・・・・・・・・・・・・・・ケージ
１８・・・・・・・・・・・・・・・トルク伝達ボール
１９・・・・・・・・・・・・・・・マウス部
２１・・・・・・・・・・・・・・・軸部
２１ｂ・・・・・・・・・・・・・・雄ねじ
２３、２７・・・・・・・・・・・・総型砥石
２３ａ、２７ａ・・・・・・・・・・小径部
２３ｂ、２７ｂ・・・・・・・・・・溝部
２３ｃ、２７ｃ・・・・・・・・・・角部
５０・・・・・・・・・・・・・・・アンギュラ玉軸受
５１・・・・・・・・・・・・・・・外輪
５１ａ・・・・・・・・・・・・・・環状凸部
５１ｂ、５１ｃ・・・・・・・・・・外側転走面
５１ｄ・・・・・・・・・・・・・・フランジ
５１ｅ・・・・・・・・・・・・・・環状凹部
５２、５３・・・・・・・・・・・・内輪
５２ａ、５３ａ・・・・・・・・・・湾曲肩部
５２ｂ、５３ｂ・・・・・・・・・・内側転走面
５２ｃ、５３ｃ・・・・・・・・・・嵌合部
５４・・・・・・・・・・・・・・・ハウジング
５５・・・・・・・・・・・・・・・軸部材
５５ａ・・・・・・・・・・・・・・鍔部
５６・・・・・・・・・・・・・・・ボール
５７・・・・・・・・・・・・・・・保持器
５９・・・・・・・・・・・・・・・重錘
６０・・・・・・・・・・・・・・・接着剤
Ａ・・・・・・・・・・・・・・・・肩部
Ｒ・・・・・・・・・・・・・・・・曲率半径
δ・・・・・・・・・・・・・・・・段差 1 ······················ Hub wheel 1a, 14, 20, 22, 26 ... shoulder 1b ······ Small diameter Stepped portion 1c, 21a ... Serration 2 ... Wheel bearing 3 ...・ ・ ・ ・ Constant velocity universal joint 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6 ・ ・..... Knuckles 7, 24 ..... Outer member 7a ... Outer rolling surface 8 ... Inner ring 8a ... Inner rolling surface 8b ...・ ・ ・ ・ ・ ・ ・ ・ Small-diameter end face 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・········································································ 11・ ・ ・ ・ ・ Seal member 12, 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Nuclear convex 13 ・ ・ ・ ・ ・ ・ ・ ・ Cylinder 15 ・ ・ ・ ・ ・ ・ ・ ・Outer joint member 16 ... Inner joint ring 17 ... Cage 18 ... ... Torque transmission ball 19 ... Mouse part 21 ... Shaft 21b ··········································································································· Part 23b, 27b ......... groove 23c, 27c ... ... Angular part 50 ... Angular contact ball bearings 51 ... Outer ring 51a ... ········································ Outside rolling surface 51d ··············································································································· Curved shoulders 52b, 53b・ ・ ・ ・ Inner rolling surface 52c, 53c ・ ・ ・ ・ ・ ・ Fitting part 54 ・ ・ ・ ・ ・ ・ Housing 55 ..... Shaft member 55a ..... Bridge part 56 ..... Ball 57 ... .... Retainer 59 ...・ Weight 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Adhesive A ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder R ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ Curvature radius δ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ step

Claims (4)

内周に複列の円弧状の外側転走面が一体に形成された外方部材と、
外周に前記複列の外側転走面に対向する円弧状の内側転走面が形成された一対の内輪と、
これら内輪と前記外方部材の両転走面間に収容された複列のボールとを備え、前記内輪の小径側端面が突合せ状態で衝合して背面合せタイプの複列のアンギュラ玉軸受を構成する車輪用軸受において、
前記外方部材と内輪がパイプ材からローリング加工によって形成され、前記外方部材の中央部を凹ませて内周に環状凸部がフラット形状に形成されると共に、前記外側転走面から前記環状凸部に繋がる肩部が、総型砥石によって前記外側転走面と同時に研削加工され、円弧状に形成され、前記環状凸部の内径が、ローリング加工によって前記肩部と微小な段差をもって形成されていることを特徴とする車輪用軸受。 An outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery;
A pair of inner rings each having an arcuate inner rolling surface facing the double row outer rolling surface on the outer periphery;
The inner ring and a double row ball accommodated between both rolling surfaces of the outer member, and a small diameter side end face of the inner ring abuts in a butted state to form a back-to-back type double row angular ball bearing. In the wheel bearing that constitutes,
The outer member and the inner ring are formed from a pipe material by rolling, the central portion of the outer member is recessed, an annular protrusion is formed in a flat shape on the inner periphery, and the annular ring is formed from the outer rolling surface. A shoulder connected to the convex portion is ground simultaneously with the outer rolling surface by a general-purpose grindstone and formed into an arc shape, and an inner diameter of the annular convex portion is formed with a small step from the shoulder portion by rolling. Wheel bearings characterized by 内周に複列の円弧状の外側転走面が一体に形成された外方部材と、
外周に前記複列の外側転走面に対向する円弧状の内側転走面が形成された一対の内輪と、
これら内輪と前記外方部材の両転走面間に収容された複列のボールとを備え、前記内輪の小径側端面が突合せ状態で衝合して背面合せタイプの複列のアンギュラ玉軸受を構成する車輪用軸受において、
前記外方部材と内輪がパイプ材からローリング加工によって形成され、前記外方部材の中央部を凹ませて内周に環状凸部がフラット形状に形成され、前記外方部材の両端面と前記内輪の大径側端面がローリング加工後に旋削加工されると共に、当該外方部材の外径面および内輪の内径面と小径側端面が研削加工によって所定の寸法、精度に形成されると共に、前記外側転走面から前記環状凸部に繋がる肩部が、総型砥石によって前記外側転走面と同時に研削加工され、円弧状に形成されていることを特徴とする車輪用軸受。 An outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery ;
A pair of inner rings each having an arcuate inner rolling surface facing the double row outer rolling surface on the outer periphery;
The inner ring and a double row ball accommodated between both rolling surfaces of the outer member, and a small diameter side end face of the inner ring abuts in a butted state to form a back-to-back type double row angular ball bearing. In the wheel bearing that constitutes,
The outer member and the inner ring are formed from a pipe material by rolling, the center part of the outer member is recessed, and the annular protrusion is formed in a flat shape on the inner periphery, and both end faces of the outer member and the inner ring The large-diameter end surface of the outer member is turned after rolling, and the outer diameter surface of the outer member, the inner diameter surface of the inner ring, and the small-diameter end surface are formed with a predetermined size and accuracy by grinding, and the outer rolling A wheel bearing characterized in that a shoulder connected from the running surface to the annular convex portion is ground at the same time as the outer rolling surface by a general-purpose grindstone and is formed in an arc shape. 前記複列の外側転走面が総型砥石によって同時に研削加工されている請求項１または２に記載の車輪用軸受。   The wheel bearing according to claim 1 or 2, wherein the double-row outer rolling surface is ground by a grindstone at the same time. 一端部に車輪取付フランジを一体に有し、この車輪取付フランジから肩部を介して軸方向に延びる小径段部が形成されたハブ輪と、このハブ輪の小径段部に所定のシメシロを介して圧入された前記請求項１乃至３いずれかに記載の車輪用軸受とを備え、前記ハブ輪に等速自在継手の外側継手部材がセレーションを介して内嵌され、前記一対の内輪が前記ハブ輪の肩部と前記外側継手部材の肩部とで挟持され、所定の軸受予圧が付与されていることを特徴とする車輪用軸受装置。 A hub wheel integrally having a wheel mounting flange at one end and having a small-diameter step portion extending in the axial direction from the wheel mounting flange via a shoulder portion, and a predetermined squeeze through a small-diameter step portion of the hub wheel The wheel bearing according to any one of claims 1 to 3 , wherein the outer joint member of the constant velocity universal joint is fitted into the hub wheel via a serration, and the pair of inner rings are the hub. A wheel bearing device characterized by being sandwiched between a shoulder portion of a ring and a shoulder portion of the outer joint member and given a predetermined bearing preload.

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