JP4483902B2 - Hub unit for vehicles - Google Patents

Hub unit for vehicles Download PDF

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Publication number
JP4483902B2
JP4483902B2 JP2007177970A JP2007177970A JP4483902B2 JP 4483902 B2 JP4483902 B2 JP 4483902B2 JP 2007177970 A JP2007177970 A JP 2007177970A JP 2007177970 A JP2007177970 A JP 2007177970A JP 4483902 B2 JP4483902 B2 JP 4483902B2
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Japan
Prior art keywords
constant velocity
velocity joint
ring
outer ring
mold
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Expired - Fee Related
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JP2007326571A (en
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昌弘 井上
孝爾 嶋
聡 荒木
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JTEKT Corp
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JTEKT Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • 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
    • F16C19/185—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 two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D2003/22326—Attachments to the outer joint member, i.e. attachments to the exterior of the outer joint member or to the shaft of the outer joint member
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2250/00—Manufacturing; Assembly
    • F16D2250/0023—Shaping by pressure

Description

本発明は、ディスクブレーキ装置のディスクロータおよび車輪が取り付けられる車両用ハブユニット（以下、単にハブユニットという）およびこれの等速ジョイントの製作方法に関する。   The present invention relates to a vehicle hub unit (hereinafter simply referred to as a hub unit) to which a disc rotor and wheels of a disc brake device are attached, and a method for manufacturing the constant velocity joint thereof.

ハブユニットに対して、動力伝達軸を一体的に結合するためツェッパタイプの等速ジョイントを組み込む形態が考えられている。この場合、等速ジョイントの外輪については、傾動案内用のボール群の軌道となる椀型の筒部と、この椀型筒部の小径部分にハブユニットのハブホイールに対して結合するための軸部とを有する構造となっている。   In order to integrally couple the power transmission shaft to the hub unit, a form in which a Rzeppa type constant velocity joint is incorporated is considered. In this case, with respect to the outer ring of the constant velocity joint, a bowl-shaped cylinder part that becomes the track of the tilt guide ball group, and a shaft for coupling to the hub wheel of the hub unit to the small diameter part of the bowl-shaped cylinder part It has the structure which has a part.

この外輪では、軽量化のために前記軸部を中空とするが、この軸部と椀型筒部とは椀型筒部内の密封性を確保するために仕切壁を設けて、連通させない構造にしている。このような等速ジョイントの外輪の場合、その形状が複雑となるために、従来、熱間鍛造により製作している。
特開平１０−２９７２０７号公報 In this outer ring, the shaft portion is hollow for weight reduction. However, the shaft portion and the vertical tube portion are provided with a partition wall in order to ensure the sealing performance in the vertical tube portion so that the shaft portion and the vertical tube portion do not communicate with each other. ing. In the case of such an outer ring of a constant velocity joint, since the shape thereof is complicated, it has been conventionally manufactured by hot forging.
JP 10-297207 A

このようなハブユニットの場合、等速ジョイントの外輪を上記したように熱間鍛造により製作するようになっているが、この熱間鍛造において等速ジョイントにおける外輪内面に対して、旋削加工、荒研磨加工、仕上研磨加工を施すという加工作業となって、加工作業に手間がかかり、また、その加工コストが高価につく。   In such a hub unit, the outer ring of the constant velocity joint is manufactured by hot forging as described above. In this hot forging, the inner surface of the outer ring of the constant velocity joint is turned and roughened. It becomes a processing operation of performing a polishing process and a finish polishing process, and it takes time and effort, and the processing cost is expensive.

加えて上記仕切壁を備えたハブユニットにおいては、等速ジョイントの発生熱を円筒軸部側に放熱させやすくするためにはその仕切壁を薄くする方が好ましいが、仕切壁が外輪と一体に形成されていたため、その仕切壁の板厚を薄くするとしても限界があり放熱効果をより高くした構造が求められる。   In addition, in the hub unit having the partition wall, it is preferable to make the partition wall thin in order to make it easy to dissipate the heat generated by the constant velocity joint to the cylindrical shaft portion side, but the partition wall is integrated with the outer ring. Since it is formed, there is a limit even if the thickness of the partition wall is reduced, and a structure with a higher heat dissipation effect is required.

したがって、本発明は、ハブユニットにおいて、等速ジョイントの成形後にその外輪内面に対して旋削加工を不要にし加工コストのダウンを可能とすることを共通の解決課題としている。   Therefore, the present invention has a common problem to be solved in that the hub unit does not require a turning process on the inner surface of the outer ring after the constant velocity joint is formed, and the processing cost can be reduced.

本発明はまた、等速ジョイント内の発生熱に対しその放熱効果がより高くなる構造に改善することを他の解決課題としている。   Another object of the present invention is to improve the structure in which the heat dissipation effect is higher with respect to the heat generated in the constant velocity joint.

本発明の請求項１に係る車両用ハブユニットは、二列の軌道溝が内周面に形成され車体に固定される外輪と、車輪が取り付けられるフランジ部と前記外輪の一方の軌道溝に対向する軌道溝が形成された本体部とに備えたハブホイールと、外周に前記外輪の他方の軌道溝に対向する軌道溝が形成された内輪と、椀型筒部とこの椀型筒部の小径部分に連接される円筒軸部とを冷間鍛造により一体に形成した等速ジョイントの外輪と、を備え、前記ハブホイールと前記内輪とは、前記円筒軸部の外周面に外嵌され、該円筒軸部の一方の軸端部を前記ハブホイールの一方側端面にかしめて、前記ハブホイールと前記内輪とを前記等速ジョイントの外輪に固定し、前記等速ジョイントの外輪が、外型と内型とにより筒状鋼材を冷間鍛造することにより製作され、外型は、等速ジョイントの外輪の椀型筒部の外径面形状に対応した凹凸面を有する内周壁面と、円筒軸部の外径面形状に対応した凹凸面を有する内周壁面とを備え、内型は、等速ジョイントの外輪の椀型筒部の内径面形状に対応した凹凸面を有する外周壁面と、円筒軸部の内径面形状に対応した凹凸面を有する外周壁面とを備え、筒状鋼材は、円筒軸部に相当する部分の外径が外型の内周壁面の内径より若干小さく、内径が内型の外周壁面の外径より若干小さくされ、外型内に筒状鋼材を配置し内型を筒状鋼材内に挿入することにより冷間鍛造されている。 According to a first aspect of the present invention, there is provided a vehicle hub unit, wherein two rows of raceway grooves are formed on an inner peripheral surface and are fixed to a vehicle body, a flange portion to which a wheel is attached, and one raceway groove of the outer race. A hub wheel provided in a main body part formed with a raceway groove to be formed, an inner ring having a raceway groove formed on the outer periphery facing the other raceway groove of the outer ring, a vertical cylinder part, and a small diameter of the vertical cylinder part An outer ring of a constant velocity joint integrally formed by cold forging with a cylindrical shaft portion connected to the portion, and the hub wheel and the inner ring are externally fitted to the outer peripheral surface of the cylindrical shaft portion, One end of the cylindrical shaft is caulked to one end surface of the hub wheel, the hub wheel and the inner ring are fixed to the outer ring of the constant velocity joint, and the outer ring of the constant velocity joint is Made by cold forging cylindrical steel with inner mold The outer mold has an inner circumferential wall surface having an irregular surface corresponding to the outer diameter surface shape of the vertical cylindrical portion of the outer ring of the constant velocity joint, and an inner circumference having an irregular surface corresponding to the outer diameter surface shape of the cylindrical shaft portion. And the inner mold has an outer circumferential wall surface having an irregular surface corresponding to the inner diameter surface shape of the vertical cylindrical portion of the outer ring of the constant velocity joint, and an outer circumferential wall surface having an irregular surface corresponding to the inner diameter surface shape of the cylindrical shaft portion. The cylindrical steel material has an outer diameter of a portion corresponding to the cylindrical shaft portion slightly smaller than an inner diameter of the inner peripheral wall surface of the outer mold, and an inner diameter is slightly smaller than an outer diameter of the outer peripheral wall surface of the inner mold. Cold forging is performed by arranging a cylindrical steel material and inserting an inner die into the cylindrical steel material.

本発明の請求項２に係る車両用ハブユニットは、二列の軌道溝が内周面に形成され車体に固定される外輪と、車輪が取り付けられるフランジ部を有するハブホイールと、外周に前記外輪の一方の軌道溝に対向する軌道溝が形成された第１の内輪と、外周に前記外輪の他方の軌道溝に対向する軌道溝が形成された第２の内輪と、椀型筒部とこの筒部の小径部分に連接される円筒軸部とを冷間鍛造により一体に形成した等速ジョイントの外輪と、を備え、前記ハブホイールと前記第１の内輪と第２の内輪とは、前記円筒軸部の外周面に外嵌され、該円筒軸部の一方の軸端部を前記ハブホイールの一方側側面にかしめて、前記ハブホイールと前記内輪とを前記等速ジョイントの外輪に固定し、前記等速ジョイントの外輪が、外型と内型とにより筒状鋼材を冷間鍛造することにより製作され、外型は、等速ジョイントの外輪の椀型筒部の外径面形状に対応した凹凸面を有する内周壁面と、円筒軸部の外径面形状に対応した凹凸面を有する内周壁面とを備え、内型は、等速ジョイントの外輪の椀型筒部の内径面形状に対応した凹凸面を有する外周壁面と、円筒軸部の内径面形状に対応した凹凸面を有する外周壁面とを備え、筒状鋼材は、円筒軸部に相当する部分の外径が外型の内周壁面の内径より若干小さく、内径が内型の外周壁面の外径より若干小さくされ、外型内に筒状鋼材を配置し内型を筒状鋼材内に挿入することにより冷間鍛造されている。 According to a second aspect of the present invention, there is provided a vehicle hub unit comprising: an outer ring having two rows of raceway grooves formed on an inner peripheral surface thereof and fixed to a vehicle body; a hub wheel having a flange portion to which a wheel is attached; A first inner ring formed with a track groove facing one of the track grooves, a second inner ring formed with a track groove facing the other track groove of the outer ring on the outer periphery, An outer ring of a constant velocity joint integrally formed by cold forging with a cylindrical shaft portion connected to a small diameter portion of the cylindrical portion, and the hub wheel, the first inner ring, and the second inner ring, fitted on the outer peripheral surface of the cylindrical shaft portion, the one axial end of the cylindrical shaft portion is caulked on one side surface of the hub wheel, fixed to said inner ring and said hub wheel outer ring of the constant velocity joint , the outer ring of the constant velocity joint, the outer mold and an inner mold and the cylindrical The outer die is manufactured by cold forging the material, and the outer die has an inner peripheral wall surface having an irregular surface corresponding to the outer diameter surface shape of the vertical cylindrical portion of the outer ring of the constant velocity joint, and the outer diameter surface shape of the cylindrical shaft portion. An inner peripheral wall surface having an irregular surface corresponding to the inner surface, and the inner mold has an outer peripheral wall surface having an irregular surface corresponding to the inner diameter surface shape of the vertical cylindrical portion of the outer ring of the constant velocity joint, and the inner diameter surface shape of the cylindrical shaft portion The cylindrical steel material has an outer diameter corresponding to the cylindrical shaft portion slightly smaller than the inner diameter of the inner peripheral wall of the outer mold, and the inner diameter is outside the outer peripheral wall of the inner mold. It is made slightly smaller than the diameter, and is cold forged by disposing a tubular steel material in the outer mold and inserting the inner mold into the tubular steel material.

本発明のハブユニットによると、等速ジョイントの外輪が、筒状鋼材を冷間鍛造して製作されたものであるから、その鍛造後においては等速ジョイントの外輪内面に対して旋削加工を施す作業が不要化し、加工コストがダウンしたものとなる。   According to the hub unit of the present invention, the outer ring of the constant velocity joint is manufactured by cold forging a cylindrical steel material, and after the forging, the inner surface of the outer ring of the constant velocity joint is turned. The work becomes unnecessary and the processing cost is reduced.

前記ハブユニットの場合、前記等速ジョイントの外輪における椀型筒部の内部と前記円筒軸部の内部とを仕切る蓋体を付設し、前記椀型筒部内部の放熱効果を高めるために前記蓋体の肉厚を軸方向に薄肉としたり、あるいは蓋体を熱伝導性に優れた材料で構成していると、等速ジョイントの椀型筒部内部の発生熱を円筒軸部側に放熱させやすくなって好ましい。   In the case of the hub unit, a lid for separating the inside of the vertical tube portion and the inside of the cylindrical shaft portion in the outer ring of the constant velocity joint is attached, and the lid is provided to enhance the heat radiation effect inside the vertical tube portion. If the body is made thin in the axial direction or the lid is made of a material with excellent thermal conductivity, the heat generated in the vertical cylinder of the constant velocity joint is dissipated to the cylindrical shaft. It is preferable because it becomes easier.

以上のように本発明の場合、等速ジョイントの外輪が、傾動動作用の複数のボール群の軌道となる椀型筒部と、この筒部の小径部分に一体連接されて前記ハブホイールに少なくとも回転方向に一体となる状態で内装される円筒軸部とを有し、この外輪が、筒状鋼材を冷間鍛造により製作されているので、前記鍛造後において等速ジョイントの外輪内面に対して旋削加工を施す作業が不要化し、加工コストがダウンしたものとなる。   As described above, in the case of the present invention, the outer ring of the constant velocity joint is integrally connected to the saddle-shaped cylindrical portion serving as the track of the plurality of balls for tilting operation and the small-diameter portion of the cylindrical portion, and at least to the hub wheel. Since the outer ring is manufactured by cold forging a tubular steel material with respect to the inner surface of the outer ring of the constant velocity joint after the forging. This eliminates the need for turning and reduces the machining cost.

以下、本発明の詳細を図面に示す実施形態に基づいて説明する。なお、図１に示すものは、参考例の車両用ハブユニットであり、図６及び図７に示すものは本発明に係る車両用ハブユニットである。 Hereinafter, details of the present invention will be described based on embodiments shown in the drawings. 1 is a vehicle hub unit of a reference example, and those shown in FIGS. 6 and 7 are vehicle hub units according to the present invention.

図１は、参考例の実施形態を示している。図１は、ハブユニットの縦断側面図である。また、図２はハブユニットの使用形態を示す模式図である。 FIG. 1 shows an embodiment of a reference example . FIG. 1 is a longitudinal side view of the hub unit . Also, FIG. 2 is a schematic diagram showing a usage configuration of the hub unit.

図例のハブユニット１０は、ハブホイール１１と、等速ジョイント１２と、複列転がり軸受１３とを備えており、ハブホイール１１の外周に複列転がり軸受１３が、ハブホイール１１の内周に等速ジョイント１２が組み込まれた構成になっている。   The illustrated hub unit 10 includes a hub wheel 11, a constant velocity joint 12, and a double row rolling bearing 13, and the double row rolling bearing 13 is disposed on the outer periphery of the hub wheel 11 on the inner periphery of the hub wheel 11. The constant velocity joint 12 is incorporated.

ハブホイール１１は、円筒型の本体１１ａに、軸方向外端部に径方向外向きのフランジ１１ｂを設けた形状を有する。フランジ１１ａの円周数箇所には、ボルト挿通孔１５が形成され、各ボルト挿通孔１５にボルト１６が貫通状態で挿入される。ボルト１６を介してフランジ１４の片面に沿わせられた状態でディスクブレーキ装置のディスクロータ１７および車輪（図示省略）が取り付けられる。１８はブレーキパッドである。   The hub wheel 11 has a shape in which a radially outward flange 11b is provided on an axially outer end portion of a cylindrical main body 11a. Bolt insertion holes 15 are formed at several circumferential positions of the flange 11a, and the bolts 16 are inserted into the respective bolt insertion holes 15 in a through state. A disc rotor 17 and a wheel (not shown) of the disc brake device are attached in a state of being along one side of the flange 14 via the bolt 16. Reference numeral 18 denotes a brake pad.

複列転がり軸受１３は、二列の軌道溝を有する単一の外輪１９、二列で配設される転動体としての複数の玉２０、二つの冠形保持器２１、ハブホイール１１の本体１１ａの外周面を一方内輪、等速ジョイント１２の外輪２５の外周面を他方内輪とする構成を有し、かしめ部２２から前記内輪が押し付けられていることにより、所要の予圧（圧縮応力）が付与され、かつ抜け止めされている。   The double row rolling bearing 13 includes a single outer ring 19 having two rows of raceway grooves, a plurality of balls 20 as rolling elements arranged in two rows, two crown-shaped cages 21, and a main body 11a of the hub wheel 11. The outer peripheral surface of the inner ring is one inner ring, and the outer peripheral surface of the outer ring 25 of the constant velocity joint 12 is the other inner ring, and the inner ring is pressed from the caulking portion 22 so that the required preload (compressive stress) is applied. And is secured.

複列転がり軸受１３の外輪１９にフランジ２３が形成され、このフランジ２３は、車体２４にボルト止めされている。   A flange 23 is formed on the outer ring 19 of the double row rolling bearing 13, and the flange 23 is bolted to the vehicle body 24.

等速ジョイント１２は、一般的にＣＶＪ（定速度ジョイント：Constant Velocity Joint）とも呼ばれる周知のものであり、外輪２５、内輪２７、複数のボール群２８、保持器２９などを有し、ハブホイール１１に一体的に結合されてそのハブホイール１１に動力伝達軸であるドライブシャフト３０を傾動可能に連結する。   The constant velocity joint 12 is a well-known one generally called CVJ (Constant Velocity Joint), and includes an outer ring 25, an inner ring 27, a plurality of ball groups 28, a retainer 29, and the like. The drive shaft 30 which is a power transmission shaft is connected to the hub wheel 11 so as to be tiltable.

等速ジョイント１２の外輪２５は、前記傾動動作用の複数のボール群２８の軌道となる椀型筒部２５ａと、この椀型筒部２５ａの小径部分に一体連接されてハブホイール１１に回転方向に一体となる状態で内装される円筒軸部２５ｂとを有している。   The outer ring 25 of the constant velocity joint 12 is integrally connected to a saddle-shaped cylindrical portion 25a serving as a track of the plurality of ball groups 28 for tilting operation and a small-diameter portion of the saddle-shaped cylindrical portion 25a, and rotates in the direction of rotation with the hub wheel 11. And a cylindrical shaft portion 25b that is installed in an integrated state.

等速ジョイント１２の外輪２５においてその椀型筒部２５ａの外周にはその軸方向内端側に複列転がり軸受１３を軸方向から受け止める受け面２５ａが設けられている。   In the outer ring 25 of the constant velocity joint 12, a receiving surface 25 a for receiving the double row rolling bearing 13 from the axial direction is provided on the outer periphery of the vertical tube portion 25 a on the inner end side in the axial direction.

また、等速ジョイント１２の外輪２５においてその円筒軸部２５ｂは、ハブホイール１１の内周面にスプライン嵌合されているとともに、その軸方向外端部２２ａが、ハブホイール１１の軸方向外端面に対して径方向外向きに屈曲されてかしめられたかしめ部２２とされ、これによってハブホイール１１に対し一体とされている。このかしめ部２２により、複列転がり軸受１３に対しての抜け止めと予圧付与が行われる。   Further, in the outer ring 25 of the constant velocity joint 12, the cylindrical shaft portion 25 b is splined to the inner peripheral surface of the hub wheel 11, and the axial outer end portion 22 a is the axial outer end surface of the hub wheel 11. The caulking portion 22 is caulked by being bent radially outward with respect to the hub wheel 11. The caulking portion 22 prevents the double row rolling bearing 13 from coming off and applies a preload.

等速ジョイント１２の内輪２７には、シャフト３０の一方軸端がスプライン嵌合され止め輪３１などで抜け止め固定されている。これにより、シャフト３０の回転動力が、等速ジョイント１２を介してハブホイール１１に取り付けられてある車輪（不図示）に対して伝達される。なお、等速ジョイント１２のブーツの図示は省略されている。   One end of the shaft 30 is spline-fitted to the inner ring 27 of the constant velocity joint 12 and is fixed by a retaining ring 31 or the like. As a result, the rotational power of the shaft 30 is transmitted to the wheel (not shown) attached to the hub wheel 11 via the constant velocity joint 12. The illustration of the boot of the constant velocity joint 12 is omitted.

等速ジョイント１２は、通常、シャフト３０と、シャフト３０の他端に取り付けられる等速ジョイント３２とでシャフトアセンブリ３３を構成するものであるが、この実施形態のハブユニット１０では、等速ジョイント１２を組み込んでいるから、シャフトアセンブリ３３と合体した製品とすることができる。３５はデファレンシャル装置である。   The constant velocity joint 12 normally constitutes the shaft assembly 33 by the shaft 30 and the constant velocity joint 32 attached to the other end of the shaft 30. In the hub unit 10 of this embodiment, the constant velocity joint 12 is used. Therefore, a product combined with the shaft assembly 33 can be obtained. Reference numeral 35 denotes a differential device.

そして、この実施形態のハブユニット１０は、等速ジョイント１２の内部に主として雨水や塵埃等の異物の侵入の防止のためや等速ジョイント１２内の油が外部に漏れるのを防止するなど密封性確保のための蓋体３４が付設されている。蓋体３４の肉厚は、等速ジョイント１２とは別体構造となっているから、等速ジョイント１２内の発生熱を放熱させる効果を高めるために薄肉構造とすることが可能である。   The hub unit 10 of this embodiment is hermetically sealed to prevent foreign matter such as rainwater and dust from entering mainly inside the constant velocity joint 12 and to prevent oil in the constant velocity joint 12 from leaking to the outside. A lid 34 for securing is attached. Since the lid 34 has a separate structure from the constant velocity joint 12, the lid 34 can have a thin structure in order to enhance the effect of radiating the heat generated in the constant velocity joint 12.

この場合、蓋体３４は、熱伝導性に優れた材料で構成すると、等速ジョイント１２内の発生熱をよりスムーズに蓋体３４から円筒軸部２５ｂの内部へ放熱させる効果が高まって等速ジョイント１２の寿命向上を図れて好ましいが、特に等速ジョイント１２の外輪２５よりも優れた熱伝導性の材料で構成するとその発生熱は外輪２５に熱伝導されるよりも蓋体３４に熱伝導される比率が高くなり、結果として、等速ジョイント１２の寿命向上をより図れて好ましい。この材料としては例えばアルミニウム、銅、亜鉛、等の合金がある。さらに、この蓋体３４は、円筒軸部内部に面した側に放熱フィンを設けた形態としてその放熱面積を増大しその放熱効果を高めてもよい。   In this case, when the lid body 34 is made of a material having excellent thermal conductivity, the effect of radiating the heat generated in the constant velocity joint 12 more smoothly from the lid body 34 to the inside of the cylindrical shaft portion 25b is increased. Although the life of the joint 12 is improved, it is preferable. However, when it is made of a heat conductive material superior to the outer ring 25 of the constant velocity joint 12, the generated heat is conducted to the lid 34 rather than being conducted to the outer ring 25. As a result, the life of the constant velocity joint 12 can be further improved. Examples of this material include alloys such as aluminum, copper, and zinc. Further, the lid 34 may have a heat radiating area increased as a form in which a heat radiating fin is provided on the side facing the inside of the cylindrical shaft portion to enhance the heat radiating effect.

次に、等速ジョイント１２特にその外輪２５の製作方法について図３ないし図５を参照して説明する。   Next, a method for manufacturing the constant velocity joint 12, particularly its outer ring 25, will be described with reference to FIGS. 3 to 5.

この製作方法は、要するに、前記外輪２５を冷間鍛造により製作するものであり、そのため、図３で示すような外型４０と内型５０とを用意する。   In short, this manufacturing method is to manufacture the outer ring 25 by cold forging. Therefore, an outer mold 40 and an inner mold 50 as shown in FIG. 3 are prepared.

外型４０は、等速ジョイント１２の外輪２５の椀型筒部２５ａの外径面形状に対応した凹凸面を有する内周壁面４０ａと、円筒軸部２５ｂの外径面形状に対応した凹凸面を有する内周壁面４０ｂとを備えており、適宜の部位に固定されている。   The outer mold 40 includes an inner circumferential wall surface 40a having an irregular surface corresponding to the outer diameter surface shape of the vertical cylindrical portion 25a of the outer ring 25 of the constant velocity joint 12, and an irregular surface corresponding to the outer diameter surface shape of the cylindrical shaft portion 25b. And an inner peripheral wall surface 40b having an inner wall, and is fixed to an appropriate part.

内型５０は、等速ジョイント１２の外輪２５の椀型筒部２５ａの内径面形状に対応した凹凸面を有する外周壁面５０ａと、円筒軸部２５ｂの内径面形状に対応した凹凸面を有する外周壁面５０ｂとを備えており、矢印方向に下降制御されるようになっている。   The inner die 50 has an outer peripheral wall surface 50a having an irregular surface corresponding to the inner diameter surface shape of the saddle tube portion 25a of the outer ring 25 of the constant velocity joint 12, and an outer periphery having an irregular surface corresponding to the inner diameter surface shape of the cylindrical shaft portion 25b. A wall surface 50b is provided and is controlled to be lowered in the direction of the arrow.

そして、図３で示すように外型４０の内部に筒状鋼材６０を配置し、内型５０を下降させる。ここで筒状鋼材６０の外径は、外型４０の内周壁面４０ｂの内径より若干小さくし、また、その内径は、内型５０の外周壁面５０ｂの外径とほぼ一致させるか、若干小さくしている。   Then, as shown in FIG. 3, the tubular steel material 60 is disposed inside the outer mold 40, and the inner mold 50 is lowered. Here, the outer diameter of the cylindrical steel material 60 is slightly smaller than the inner diameter of the inner peripheral wall surface 40b of the outer mold 40, and the inner diameter is substantially equal to or slightly smaller than the outer diameter of the outer peripheral wall surface 50b of the inner mold 50. is doing.

なお、この鋼材は、鍛造加工の精度を高めたりするため例えば円筒形にされるが、その鋼材６０は、筒状であればその形状は問わない。鋼材６０は、例えば炭素鋼または合金鋼なとが挙げられる。   In addition, although this steel material is made cylindrical, for example in order to raise the precision of a forge process, the shape is not ask | required if the steel material 60 is cylindrical. Examples of the steel material 60 include carbon steel and alloy steel.

そして、筒状鋼材６０は、前記両型４０，６０により図４で示すようにそれぞれの壁面形状に対応して塑性変形される。   Then, the tubular steel material 60 is plastically deformed corresponding to the respective wall surface shapes as shown in FIG.

こうして塑性変形した筒状鋼材６０を図５で示すように両型４０，６０から取り出すと等速ジョイント１２の外輪２５が製作される。   When the cylindrical steel material 60 thus plastically deformed is taken out from both molds 40, 60 as shown in FIG. 5, the outer ring 25 of the constant velocity joint 12 is manufactured.

このような製作による場合、等速ジョイント１２の外輪２５は、その鍛造温度が低温であるために、筒状鋼材６０が流動化せず結晶粒が粗大化することがなくなり、したがって、鍛造加工後に旋削加工をする必要がない。   In such a production, the outer ring 25 of the constant velocity joint 12 has a low forging temperature, so that the tubular steel material 60 is not fluidized and the crystal grains are not coarsened. There is no need for turning.

この場合の鍛造加工は通常、室温で行われるが、温間鍛造加工以下の温度で行われる加工を含む。   The forging process in this case is normally performed at room temperature, but includes a process performed at a temperature equal to or lower than the warm forging process.

ただし、冷間鍛造の場合、筒状鋼材６０を高速で加工すると歪み硬化が大きくなる傾向にあるので、内型５０を低速で下降させていくことで歪み硬化を抑制することが好ましい。   However, in the case of cold forging, strain hardening tends to increase when the cylindrical steel material 60 is processed at a high speed. Therefore, it is preferable to suppress strain hardening by lowering the inner die 50 at a low speed.

以上の実施形態によると、等速ジョイント１２の外輪２５が、冷間鍛造で製作されるから、その鍛造後においては等速ジョイント１２の外輪２５内面に対して旋削加工を施す作業が不要化し、加工コストがダウンする。   According to the above embodiment, since the outer ring 25 of the constant velocity joint 12 is manufactured by cold forging, the work of turning the inner surface of the outer ring 25 of the constant velocity joint 12 after the forging becomes unnecessary. Processing cost is reduced.

本発明は、以下の（１），（２）に示すものである。参考例として図１に示したものにおける等速ジョイントの冷間鍛造で製作される構成（図３から図５の工程図参照）は、以下の（１），（２）に示すものでも同様の構成である。 The present invention is shown in the following (1) and (2). As a reference example, the structure manufactured by cold forging of the constant velocity joint in the one shown in FIG. 1 (see the process diagrams in FIGS. 3 to 5) is the same as that shown in the following (1) and (2). It is a configuration .

（１）上述の実施形態では、複列転がり軸受１３の他方内輪の軌道面は、等速ジョイント１２の外輪２５の椀型筒部２５ａの外周面で構成されているが、前記他方内輪を図６で示すように外輪２５の椀型筒部２５ａとは別体構造の内輪７０で構成し、この内輪７０をその椀型筒部２５ａの外周面で受け止める構造としてもよい。  (1) In the above-described embodiment, the raceway surface of the other inner ring of the double row rolling bearing 13 is constituted by the outer peripheral surface of the vertical cylindrical portion 25a of the outer ring 25 of the constant velocity joint 12, but the other inner ring is illustrated. 6, the inner ring 70 may be configured separately from the saddle tube portion 25 a of the outer ring 25, and the inner ring 70 may be received by the outer peripheral surface of the saddle tube portion 25 a.

（２）上述の実施形態では、複列転がり軸受１３の一方内輪と他方内輪それぞれの軌道面は、ハブホイール１１の本体１１ａと等速ジョイント１２の外輪２５の椀型筒部２５ａそれぞれの外周面で構成されているが、前記一方と他方内輪それぞれを図７で示すようにこれらとは別体構造の内輪７１，７０で構成し、この内輪７１，７０をハブホイール１１の本体１１ａと等速ジョイント１２の外輪２５の椀型筒部２５ａそれぞれの外周面で受け止める構造としてもよい。  (2) In the above-described embodiment, the raceway surfaces of the one inner ring and the other inner ring of the double row rolling bearing 13 are the outer peripheral surfaces of the main body 11a of the hub wheel 11 and the saddle tube portion 25a of the outer ring 25 of the constant velocity joint 12, respectively. As shown in FIG. 7, each of the one and the other inner rings is constituted by inner rings 71 and 70 having a separate structure, and the inner rings 71 and 70 are made at a constant speed with the main body 11a of the hub wheel 11. It is good also as a structure received on the outer peripheral surface of each saddle type cylinder part 25a of the outer ring | wheel 25 of the joint 12. FIG.

参考例の一実施形態にかかるハブユニットの縦断側面図Vertical side view of a hub unit according to an embodiment of a reference example ハブユニットの使用形態を示す模式図Schematic diagram showing a usage configuration of Ha subunit 等速ジョイントの外輪の製作の説明のための第１工程図First process diagram for explanation of production of outer ring of constant velocity joint 等速ジョイントの外輪の製作の説明のための第２工程図2nd process drawing for explanation of production of outer ring of constant velocity joint 等速ジョイントの外輪の製作の説明のための第３工程図3rd process drawing for explanation of production of outer ring of constant velocity joint 本発明の実施形態にかかるハブユニットの縦断側面図Longitudinal side view of a hub unit according to the implementation embodiments of the present invention 本発明の他の実施形態に係るハブユニットの縦断側面図A longitudinal side view of a hub unit according to another embodiment of the present invention.

符号の説明Explanation of symbols

１０ ハブユニット
１１ ハブホイール
１１ａ ハブホイール本体
１２ 等速ジョイント
１３ 複列転がり軸受
２５ 等速ジョイントの外輪
２５ａ 等速ジョイントの外輪の椀型筒部
２５ｂ 等速ジョイントの外輪の円筒軸部
４０ 外型
５０ 内型
６０ 筒状鋼材 DESCRIPTION OF SYMBOLS 10 Hub unit 11 Hub wheel 11a Hub wheel main body 12 Constant velocity joint 13 Double row rolling bearing 25 Outer ring of constant velocity joint 25a Vertical cylinder part of outer ring of constant velocity joint 25b Cylindrical shaft part of outer ring of constant velocity joint 40 Outer type 50 Inner mold 60 Tubular steel

Claims (2)

二列の軌道溝が内周面に形成され車体に固定される外輪と、
車輪が取り付けられるフランジ部と前記外輪の一方の軌道溝に対向する軌道溝が形成された本体部とに備えたハブホイールと、
外周に前記外輪の他方の軌道溝に対向する軌道溝が形成された内輪と、
椀型筒部とこの椀型筒部の小径部分に連接される円筒軸部とを冷間鍛造により一体に形成した等速ジョイントの外輪と、を備え、
前記ハブホイールと前記内輪とは、前記円筒軸部の外周面に外嵌され、該円筒軸部の一方の軸端部を前記ハブホイールの一方側端面にかしめて、前記ハブホイールと前記内輪とを前記等速ジョイントの外輪に固定し、
前記等速ジョイントの外輪が、外型と内型とにより筒状鋼材を冷間鍛造することにより製作され、
外型は、等速ジョイントの外輪の椀型筒部の外径面形状に対応した凹凸面を有する内周壁面と、円筒軸部の外径面形状に対応した凹凸面を有する内周壁面とを備え、
内型は、等速ジョイントの外輪の椀型筒部の内径面形状に対応した凹凸面を有する外周壁面と、円筒軸部の内径面形状に対応した凹凸面を有する外周壁面とを備え、
筒状鋼材は、円筒軸部に相当する部分の外径が外型の内周壁面の内径より若干小さく、内径が内型の外周壁面の外径より若干小さくされ、
外型内に筒状鋼材を配置し内型を筒状鋼材内に挿入することにより冷間鍛造されている、ことを特徴とする車両用ハブユニット。 An outer ring in which two rows of raceway grooves are formed on the inner peripheral surface and fixed to the vehicle body;
A hub wheel provided in a flange portion to which a wheel is attached and a main body portion in which a raceway groove facing one raceway groove of the outer ring is formed;
An inner ring formed with a raceway groove on the outer periphery facing the other raceway groove of the outer ring,
An outer ring of a constant velocity joint integrally formed by cold forging a vertical tube portion and a cylindrical shaft portion connected to a small diameter portion of the vertical tube portion;
The hub wheel and the inner ring are fitted on the outer peripheral surface of the cylindrical shaft portion, and one shaft end portion of the cylindrical shaft portion is caulked to one end surface of the hub wheel, and the hub wheel and the inner ring are Is fixed to the outer ring of the constant velocity joint ,
The outer ring of the constant velocity joint is manufactured by cold forging a tubular steel material with an outer mold and an inner mold,
The outer mold has an inner circumferential wall surface having an irregular surface corresponding to the outer diameter surface shape of the vertical cylindrical portion of the outer ring of the constant velocity joint, and an inner circumferential wall surface having an irregular surface corresponding to the outer diameter surface shape of the cylindrical shaft portion. With
The inner mold includes an outer peripheral wall surface having an irregular surface corresponding to the inner diameter surface shape of the vertical cylindrical portion of the outer ring of the constant velocity joint, and an outer peripheral wall surface having an irregular surface corresponding to the inner diameter surface shape of the cylindrical shaft portion,
The cylindrical steel material has an outer diameter corresponding to the cylindrical shaft part slightly smaller than the inner diameter of the inner peripheral wall surface of the outer mold, and the inner diameter is slightly smaller than the outer diameter of the outer peripheral wall surface of the inner mold,
A hub unit for a vehicle, which is cold forged by disposing a tubular steel material in an outer mold and inserting the inner mold into the tubular steel material . 二列の軌道溝が内周面に形成され車体に固定される外輪と、
車輪が取り付けられるフランジ部を有するハブホイールと、
外周に前記外輪の一方の軌道溝に対向する軌道溝が形成された第１の内輪と、
外周に前記外輪の他方の軌道溝に対向する軌道溝が形成された第２の内輪と、
椀型筒部とこの筒部の小径部分に連接される円筒軸部とを冷間鍛造により一体に形成した等速ジョイントの外輪と、を備え、
前記ハブホイールと前記第１の内輪と第２の内輪とは、前記円筒軸部の外周面に外嵌され、該円筒軸部の一方の軸端部を前記ハブホイールの一方側側面にかしめて、前記ハブホイールと前記内輪とを前記等速ジョイントの外輪に固定し、
前記等速ジョイントの外輪が、外型と内型とにより筒状鋼材を冷間鍛造することにより製作され、
外型は、等速ジョイントの外輪の椀型筒部の外径面形状に対応した凹凸面を有する内周壁面と、円筒軸部の外径面形状に対応した凹凸面を有する内周壁面とを備え、
内型は、等速ジョイントの外輪の椀型筒部の内径面形状に対応した凹凸面を有する外周壁面と、円筒軸部の内径面形状に対応した凹凸面を有する外周壁面とを備え、
筒状鋼材は、円筒軸部に相当する部分の外径が外型の内周壁面の内径より若干小さく、内径が内型の外周壁面の外径より若干小さくされ、
外型内に筒状鋼材を配置し内型を筒状鋼材内に挿入することにより冷間鍛造されている、ことを特徴とする車両用ハブユニット。 An outer ring in which two rows of raceway grooves are formed on the inner peripheral surface and fixed to the vehicle body;
A hub wheel having a flange portion to which the wheel is attached;
A first inner ring having a raceway groove formed on the outer periphery facing the one raceway groove of the outer ring;
A second inner ring having a raceway groove formed on the outer periphery to face the other raceway groove of the outer ring;
An outer ring of a constant velocity joint integrally formed by cold forging a vertical cylindrical portion and a cylindrical shaft portion connected to a small diameter portion of the cylindrical portion;
The hub wheel, the first inner ring, and the second inner ring are fitted on the outer peripheral surface of the cylindrical shaft portion, and one shaft end portion of the cylindrical shaft portion is caulked to one side surface of the hub wheel. , fixed to said inner ring and said hub wheel outer ring of the constant velocity joint,
The outer ring of the constant velocity joint is manufactured by cold forging a tubular steel material with an outer mold and an inner mold,
The outer mold has an inner circumferential wall surface having an irregular surface corresponding to the outer diameter surface shape of the vertical cylindrical portion of the outer ring of the constant velocity joint, and an inner circumferential wall surface having an irregular surface corresponding to the outer diameter surface shape of the cylindrical shaft portion. With
The inner mold includes an outer peripheral wall surface having an irregular surface corresponding to the inner diameter surface shape of the vertical cylindrical portion of the outer ring of the constant velocity joint, and an outer peripheral wall surface having an irregular surface corresponding to the inner diameter surface shape of the cylindrical shaft portion,
The cylindrical steel material has an outer diameter corresponding to the cylindrical shaft part slightly smaller than the inner diameter of the inner peripheral wall surface of the outer mold, and the inner diameter is slightly smaller than the outer diameter of the outer peripheral wall surface of the inner mold,
A hub unit for a vehicle, which is cold forged by disposing a tubular steel material in an outer mold and inserting the inner mold into the tubular steel material.
JP2007177970A 2000-04-07 2007-07-06 Hub unit for vehicles Expired - Fee Related JP4483902B2 (en)

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US8083598B2 (en) * 2006-07-11 2011-12-27 Ntn Corporation Bearing device for wheel
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