JP4581615B2 - Wheel supporting hub unit, raceway member of wheel supporting hub unit, and manufacturing method thereof - Google Patents

Wheel supporting hub unit, raceway member of wheel supporting hub unit, and manufacturing method thereof Download PDF

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JP4581615B2
JP4581615B2 JP2004298585A JP2004298585A JP4581615B2 JP 4581615 B2 JP4581615 B2 JP 4581615B2 JP 2004298585 A JP2004298585 A JP 2004298585A JP 2004298585 A JP2004298585 A JP 2004298585A JP 4581615 B2 JP4581615 B2 JP 4581615B2
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wheel
hub unit
shaft portion
wheel support
ring member
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JP2006111070A (en
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一登 小林
清司 大塚
裕 安田
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NSK Ltd
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Priority to CN 200510103769 priority patent/CN1760052B/en
Priority to EP05021050A priority patent/EP1647418B1/en
Priority to US11/239,314 priority patent/US8402661B2/en
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Priority to US13/777,263 priority patent/US8881405B2/en
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Description

本発明は、例えば自動車等の車輪を懸架装置に対して回転自在に支持するための車輪支持用ハブユニット、及び車輪支持用ハブユニットの軌道輪部材、並びにその製造方法に関する。   The present invention relates to a wheel support hub unit for rotatably supporting a wheel of an automobile or the like with respect to a suspension device, a raceway member of the wheel support hub unit, and a method of manufacturing the same.

自動車等の車輪は、車体の懸架装置に取り付けた車輪支持用ハブユニットにより回転自在に支持される。車輪支持用ハブユニットでは、軌道面を有する内方部材と外方部材との間に複列の転動体が転動自在に介装されており、内方部材や外方部材には、車輪又は車体の懸架装置に取り付けるための取り付けフランジが形成されると共に、取り付けフランジの側方には、車輪を位置決めするための位置決め部が設けられている。   A wheel of an automobile or the like is rotatably supported by a wheel support hub unit attached to a vehicle suspension system. In the wheel supporting hub unit, a double-row rolling element is interposed between an inner member having a raceway surface and an outer member so as to be freely rotatable. An attachment flange for attachment to the suspension device of the vehicle body is formed, and a positioning portion for positioning the wheel is provided on the side of the attachment flange.

ところで、軌道輪部材としての内方部材と外方部材を製造するに際しては、取り付けフランジの面積が大きく、冷間鍛造では膨大な成形荷重が必要となるため、熱間鍛造による成形が一般に行われている。しかし、熱間鍛造では寸法精度が粗く、熱処理部は脱炭層除去を必要とすることもあり、後工程での大きな切削代を必要とするため、製造コストが高くなるという問題がある。   By the way, when manufacturing an inner member and an outer member as raceway members, the area of the mounting flange is large, and an enormous forming load is required in cold forging, so forming by hot forging is generally performed. ing. However, in hot forging, the dimensional accuracy is rough, and the heat treatment part may require removal of the decarburized layer, which requires a large cutting allowance in a subsequent process, resulting in an increase in manufacturing cost.

そこで、従来においては、軌道輪部材の製造方法として、円筒管を母材として冷間鍛造により成形された中間素材から取り付けフランジを切りおこして形成し、また、切りおこしで残った部分を位置決め部としたものや（例えば、特許文献１参照。）、位置決め部を軌道輪部材とは別体に成形して、軌道輪部材に取り付けたもの（例えば、特許文献２及び３参照。）が提案されている。
特開２００３−２５８０３号公報 特開２００３−２９１６０４号公報 特開２００４−７４８１５号公報 Therefore, conventionally, as a method of manufacturing the race member, a mounting flange is cut from an intermediate material formed by cold forging using a cylindrical tube as a base material, and the remaining portion after the cutting is determined by a positioning unit. (For example, refer to Patent Document 1), and a positioning part formed separately from the bearing ring member and attached to the bearing ring member (for example, see Patent Documents 2 and 3). ing.
JP 2003-25803 A JP 2003-291604 A JP 2004-74815 A

しかしながら、上記特許文献１においては、最も強度の必要な取り付けフランジと軌道輪部材の外周部とのつなぎ部分に切りおこしの際に曲げ加工を施すため、割れクラック等の欠陥が生じやすく強度的に不安定となり、しかもつなぎ部分を曲げ易くする必要があることから、つなぎ部分の厚みを厚くする等の補強ができない。また、位置決め部が周方向に連続した円筒形状とならないため、位置決めが不安定となると共に、強度的にも十分でない。   However, in the above-mentioned Patent Document 1, since bending is performed at the time of cutting the connecting portion between the mounting flange that requires the most strength and the outer peripheral portion of the bearing ring member, defects such as cracks are likely to occur. Since it becomes unstable and it is necessary to make the connecting portion easy to bend, reinforcement such as increasing the thickness of the connecting portion cannot be performed. Further, since the positioning portion does not have a continuous cylindrical shape in the circumferential direction, the positioning becomes unstable and the strength is not sufficient.

一方、上記特許文献２及び特許文献３では、位置決め部が軌道輪部材と別体とされているので位置決め部と軌道輪部材側の軌道面との位置精度や直角度が低下しやすく、また、部品点数が増えてコストが増加する。また、取り付けフランジを含んだ形状での冷間成形はできないため、後工程の切削代が多く製造コストが増加する。   On the other hand, in Patent Document 2 and Patent Document 3, since the positioning portion is separated from the race ring member, the positional accuracy and perpendicularity between the positioning portion and the raceway surface on the race ring member side are likely to decrease, The number of parts increases and the cost increases. In addition, since cold forming in a shape including the mounting flange is not possible, the cutting cost in the subsequent process is large and the manufacturing cost is increased.

本発明はこのような不都合を解消するためになされたものであり、その目的は、位置決め部を周方向に連続する円筒状に一体で成形することができると共に、取り付けフランジに曲げ等の加工を行なわずに冷間鍛造にて低荷重で成形することができる安価な車輪支持用ハブユニット、及び車輪支持用ハブユニットの軌道輪部材、並びにその製造方法を提供することにある。   The present invention has been made in order to eliminate such inconveniences, and an object of the present invention is to integrally form the positioning portion into a cylindrical shape continuous in the circumferential direction and to perform a process such as bending on the mounting flange. An object of the present invention is to provide an inexpensive wheel support hub unit that can be molded with low load by cold forging without performing it, a raceway member of the wheel support hub unit, and a method for manufacturing the same.

本発明の上記目的は、下記構成によって達成される。
（１） 中実又は中空状の軸部から径方向外方に延びる車輪又は車体を取り付ける取り付け部と、前記軸部と同心に配置された車輪又は車体の位置決めをする位置決め用筒部とを有する車輪支持用ハブユニットの軌道輪部材であって、
前記取り付け部は、軸方向の成形荷重を作用させて中実状又は中空状の軸部素材を圧縮する冷間での側方押し出し成形によって、前記軸方向の成形荷重が作用せずに前記軸部と直交する方向に放射状に延びて前記軸部と一体に形成されることを特徴とする車輪支持用ハブユニットの軌道輪部材。
（２） 前記位置決め用筒部は前記側方押出成形の押し残り部によって前記取り付け部を挟んで前記軸部と反対側に、前記軸部と一体に形成されることを特徴とする（１）に記載の車輪支持用ハブユニットの軌道輪部材。
（３） 前記取り付け部は放射状に延びる複数のフランジ部から構成され、前記フランジ部にはそれぞれ取り付け孔が設けられ、前記各フランジ部は前記取り付け孔のピッチ円位置で繋がらないことを特徴とする（１）又は（２）に記載の車輪支持用ハブユニットの軌道輪部材。
（４） 内方部材と、外方部材と、該内方部材と該外方部材との間に少なくとも転動体を有する軸受部が配設された車輪支持用ハブユニットであって、
前記内方部材と前記外方部材の少なくとも一方の部材が、（１）〜（３）のいずれかに記載の前記軌道輪部材であることを特徴とする車輪支持用ハブユニット。
（５） 中実又は中空状の軸部から径方向外方に延びる車輪又は車体を取り付ける取り付け部と、前記軸部と同心に配置された車輪又は車体の位置決めをする位置決め用筒部とを有する車輪支持用ハブユニットの軌道輪部材の製造方法であって、
予め中実状又は中空状の軸部素材を所定の形状に成形し、径方向外方に向かって放射状に延びる溝を有する金型に配置する工程と、
前記軸部素材を冷間で軸方向に押し潰して圧縮し、前記金型の放射状の溝に前記軸部素材を流動させることにより、前記取り付け部を前記軸部と一体に側方押し出しにて成形する工程と、を備え、
前記取り付け部に軸方向の成形荷重を作用させずに形成することを特徴とする車輪支持用ハブユニットの軌道輪部材の製造方法。 The above object of the present invention is achieved by the following configurations.
(1) It has a mounting part for attaching a wheel or a vehicle body extending radially outward from a solid or hollow shaft part, and a positioning cylinder part for positioning the wheel or the car body arranged concentrically with the shaft part. A ring member for a wheel supporting hub unit,
The mounting portion is formed by cold side extrusion that compresses a solid or hollow shaft material by applying an axial molding load, and the axial molding load does not act. A ring member for a wheel-supporting hub unit, which extends radially in a direction perpendicular to the shaft and is formed integrally with the shaft portion.
(2) The positioning cylinder portion is formed integrally with the shaft portion on the opposite side of the shaft portion with the attachment portion sandwiched by the side extrusion molding remaining portion (1). The raceway member of the hub unit for wheel support described in 1.
(3) The attachment portion is composed of a plurality of radially extending flange portions, and the flange portions are provided with attachment holes, respectively, and the flange portions are not connected at pitch circle positions of the attachment holes. (1) or the raceway member of the wheel supporting hub unit according to (2).
( 4 ) A wheel supporting hub unit in which an inner member, an outer member, and a bearing portion having at least a rolling element are disposed between the inner member and the outer member,
The wheel support hub unit according to any one of (1) to (3), wherein at least one of the inner member and the outer member is the raceway ring member according to any one of (1) to (3) .
( 5 ) It has a mounting part for attaching a wheel or a vehicle body extending radially outward from a solid or hollow shaft part, and a positioning cylinder part for positioning the wheel or the car body concentrically with the shaft part. A method of manufacturing a ring member for a wheel supporting hub unit,
Forming a solid or hollow shaft part material in a predetermined shape in advance and placing it in a mold having grooves radially extending outward in the radial direction; and
The shank material is compressed by crushing in the axial direction between the cold, by flowing the shank Material in radial grooves of the mold, laterally extruding the mounting portion integrally with the shaft portion And forming a process ,
Method of manufacturing a bearing ring member of the wheel support hub unit characterized that you formed without the action of axial forming load on the mounting part.

本発明によれば、取り付け部は冷間での側方押し出し成形によって軸部と一体に成形されるので、押し出し成形の特徴から押し出し長さ、すなわち取り付け部の面積が大きくなっても成形荷重は変化せず、取り付け部を圧縮成形する場合と比較して低荷重で成形できる。これにより、冷間鍛造で比較的小さな設備を用いて成形することができ、後工程での切削加工代が削減され、安価な軌道輪部材及び車輪支持用ハブユニットを得ることができる。また、取り付け部と軌道輪部材の外周部とのつなぎ部に曲げ加工を行なわないため、該つなぎ部分に十分な肉厚を確保することができ、十分な強度を持った軌道輪部材及び車輪支持用ハブユニットを得ることができる。   According to the present invention, the mounting portion is integrally formed with the shaft portion by cold side extrusion, so that the molding load is increased even if the extrusion length, that is, the area of the mounting portion is increased due to the feature of extrusion molding. It does not change and can be molded with a low load compared to the case where the mounting portion is compression molded. Thereby, it can shape | mold using a comparatively small installation by cold forging, the cutting cost in a post process is reduced, and an inexpensive bearing ring member and a wheel support hub unit can be obtained. Also, since the connecting portion and the outer peripheral portion of the bearing ring member are not bent, a sufficient thickness can be secured in the connecting portion, and the bearing ring member and the wheel support having sufficient strength can be secured. A hub unit can be obtained.

更に、取り付け部を側方押し出しにて成形しているので、押し残り部を位置決め用筒部として用いることができる。このため、周方向に連続する円筒状の位置決め用筒部を軸部と一体に高精度で容易に成形することができ、また、位置決め用筒部を別体にした場合に必要な取り付けのための余肉等が不要となるので、必要な部分の肉厚を確保した状態で材料歩留まりを良くすることができ、これにより、製造コストを低くすることができる。   Furthermore, since the attachment portion is formed by side extrusion, the unpressed portion can be used as a positioning cylinder portion. For this reason, a cylindrical positioning cylindrical portion that is continuous in the circumferential direction can be easily formed with high accuracy and integrated with the shaft portion, and for the necessary attachment when the positioning cylindrical portion is separated. Therefore, the material yield can be improved in a state where the thickness of the necessary portion is ensured, and the manufacturing cost can be reduced.

以下、本発明の車輪支持用ハブユニットの実施形態について、図面を参照して詳細に説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a wheel supporting hub unit of the present invention will be described in detail with reference to the drawings.

図１〜図３に示されるように、車輪支持用ハブユニット１は、従動輪用とされており、ハブ（内方部材）２及び軌道輪部材としての外輪（外方部材）３と、複数の転動体４とを有する軸受部を備えている。   As shown in FIGS. 1 to 3, the wheel supporting hub unit 1 is for a driven wheel, and includes a hub (inner member) 2 and an outer ring (outer member) 3 as a race ring member, and a plurality of wheels. A rolling bearing 4 is provided.

ハブ２は、軌道輪部材としての中実の軸部５を含むハブ輪６を備える。ハブ輪６は、その外周面のアウトボード側端部（自動車への組み付け状態で車幅方向外側の端部：図１の左端部）に径方向外方で軸部５と直交する方向に延びる取り付け部である車輪取り付けフランジ７を備えており、車輪取り付けフランジ７には、そのアウトボード側の側面に車輪を構成する図示しないホイール及びブレーキロータ等を取り付けるためのスタッド８が周方向に略等間隔で複数植設されている。各車輪取り付けフランジ７には、取り付け孔７ａが形成され、各車輪取り付けフランジ７は、これら取り付け孔７ａのピッチ円位置で繋がらない構成となっている。また、ハブ輪６の車輪取り付けフランジ７のアウトボード側、即ち、車輪取り付けフランジ７をはさんで軸部５と反対側には、車輪の位置決めをなす位置決め用筒部９が軸部５と同心に突設されている。   The hub 2 includes a hub ring 6 including a solid shaft portion 5 as a bearing ring member. The hub wheel 6 extends radially outwardly in a direction perpendicular to the shaft portion 5 to an end portion on the outboard side of the outer peripheral surface (an end portion on the outer side in the vehicle width direction in the assembled state in the automobile: the left end portion in FIG. 1). A wheel mounting flange 7 which is an attachment portion is provided, and a stud 8 for mounting a wheel and a brake rotor (not shown) constituting the wheel on the side surface on the outboard side is substantially equal to the circumferential direction in the wheel mounting flange 7. Several are planted at intervals. Each wheel mounting flange 7 is formed with a mounting hole 7a, and each wheel mounting flange 7 is not connected at the pitch circle position of the mounting hole 7a. On the outboard side of the wheel mounting flange 7 of the hub wheel 6, that is, on the side opposite to the shaft portion 5 across the wheel mounting flange 7, a positioning cylinder portion 9 for positioning the wheel is concentric with the shaft portion 5. Projected to

ハブ輪６のインボード側端部（自動車への組み付け状態で車幅方向内側の端部：図１の右端部）には小径段部１０が形成されており、該小径段部１０には内輪１１が嵌め込まれている。内輪１１の外周面には内輪軌道面１２が形成され、また、ハブ輪６の軸方向の中間部外周面には内輪軌道面１３が形成されている。ハブ輪６のインボード側の先端は円筒状に形成されており、円筒部（加締め部）１４を径方向外方に加締め広げることにより、内輪１１がハブ輪６に加締め固定される。なお、内輪１１は、加締め固定の他、ハブ輪６のインボード側の端面に締結されるナット（図示せず）によって必要な予圧を与えることもできる。   A small-diameter step portion 10 is formed on the inboard side end portion of the hub wheel 6 (the end portion on the inner side in the vehicle width direction in the assembled state in the automobile: the right end portion in FIG. 1). 11 is fitted. An inner ring raceway surface 12 is formed on the outer peripheral surface of the inner ring 11, and an inner ring raceway surface 13 is formed on the outer peripheral surface in the axial direction of the hub ring 6. The tip of the hub wheel 6 on the inboard side is formed in a cylindrical shape, and the inner ring 11 is crimped and fixed to the hub wheel 6 by spreading the cylindrical part (clamping part) 14 outward in the radial direction. . In addition, the inner ring 11 can be applied with a necessary preload by a nut (not shown) fastened to the end face on the inboard side of the hub wheel 6 in addition to caulking and fixing.

外輪３は、中空の軸部１５を含んで構成され、外輪３の内周面にはハブ輪６の内輪軌道面１３に対応する外輪軌道面１６及び内輪１１の内輪軌道面１２に対応する外輪軌道面１７が形成されており、また、車輪取り付けフランジ７から離間する側の外輪３の端部には径方向外方で軸部１５と直交する方向に延びる取り付け部である懸架装置取り付けフランジ１８が複数植設されている。各懸架装置取り付けフランジ１８には、取り付け孔１８ａが形成され、各懸架装置取り付けフランジ１８は、これら取り付け孔１８ａのピッチ円位置で繋がらない構成となっている。更に、外輪３の懸架装置取り付けフランジ１８のインボード側、即ち、懸架装置取り付けフランジ１８をはさんで軸部１５と反対側には、車体の位置決めをなす位置決め用筒部１９が軸部１５と同心に形成されている。
そして、複列の内輪軌道面１２，１３と複列の外輪軌道面１６，１７との間にそれぞれ複数の転動体４が保持器２０を介して周方向に転動可能に配設されている。 The outer ring 3 includes a hollow shaft portion 15, and an outer ring corresponding to the inner ring raceway surface 13 of the inner ring 11 and an outer ring raceway surface 16 corresponding to the inner ring raceway surface 13 of the inner ring 11 on the inner peripheral surface of the outer ring 3. A raceway surface 17 is formed, and the suspension device mounting flange 18 which is a mounting portion extending radially outward in a direction perpendicular to the shaft portion 15 is provided at the end of the outer ring 3 on the side away from the wheel mounting flange 7. Are planted. Each suspension device mounting flange 18 is formed with a mounting hole 18a, and each suspension device mounting flange 18 is configured not to be connected at the pitch circle position of these mounting holes 18a. Further, on the inboard side of the suspension device mounting flange 18 of the outer ring 3, that is, on the side opposite to the shaft portion 15 across the suspension device mounting flange 18, a positioning cylinder portion 19 for positioning the vehicle body is connected to the shaft portion 15. It is formed concentrically.
A plurality of rolling elements 4 are arranged between the double-row inner ring raceway surfaces 12 and 13 and the double-row outer ring raceway surfaces 16 and 17 so as to be able to roll in the circumferential direction via the cage 20. .

尚、図示の例では、転動体４として玉を使用しているが、重量の嵩む車輪支持用ハブユニットの場合には、転動体４としてテーパころを使用する場合もある。   In the illustrated example, a ball is used as the rolling element 4. However, in the case of a wheel supporting hub unit that is heavy, a tapered roller may be used as the rolling element 4.

上述の様な車輪支持用ハブユニット１を自動車に組み付けるには、外輪３の懸架装置取り付けフランジ１８を懸架装置に固定し、回転輪側のハブ輪６の車輪取り付けフランジ７にスタッド８やナット（図示せず）等を介してブレーキロータ及びホイールを固定する。 これにより、車輪を懸架装置に対して回転自在に支持することができる。   In order to assemble the wheel support hub unit 1 as described above to a vehicle, the suspension device mounting flange 18 of the outer ring 3 is fixed to the suspension device, and the stud 8 or nut ( The brake rotor and the wheel are fixed via a not-shown) or the like. Thereby, a wheel can be rotatably supported with respect to a suspension apparatus.

ここで、ハブ輪６では、軸部５と直交する方向に放射状に延びる車輪取り付けフランジ７が、冷間での側方押し出し成形によって軸部５と一体に形成され、また、成形の際の押し残り部によって構成される位置決め用筒部９も軸部５と同心に一体に形成される。一方、外輪３では、軸部１５と直交する方向に放射状に延びる懸架装置取り付けフランジ１８が、冷間での側方押し出し成形によって軸部１５と一体に形成され、成形の際の押し残り部によって構成される位置決め用筒部１９も軸部１５と同心に一体に形成される。以下、ハブ輪６と外輪３の冷間鍛造について説明する。   Here, in the hub wheel 6, a wheel mounting flange 7 that extends radially in a direction orthogonal to the shaft portion 5 is formed integrally with the shaft portion 5 by cold side extrusion, and is also pressed during molding. The positioning cylinder portion 9 constituted by the remaining portion is also formed integrally with the shaft portion 5 in one piece. On the other hand, in the outer ring 3, a suspension device mounting flange 18 extending radially in a direction orthogonal to the shaft portion 15 is integrally formed with the shaft portion 15 by cold side extrusion molding, and is formed by a remaining portion during molding. The positioning cylinder portion 19 configured is also formed integrally with the shaft portion 15. Hereinafter, cold forging of the hub wheel 6 and the outer ring 3 will be described.

図４〜図６は、ハブ輪６の冷間鍛造工程の一例を示す。まず、図４（ａ）の中実状の丸棒素材３０に前方押し出し成形を施すことにより、図４（ｂ）の軸状部材３０ａが成形される。次いで、軸状部材３０ａの頭部をヘディングして位置決め用筒部９の外径φＤとほぼ同径まで漬すことで、図４（ｃ）に示す軸部素材３０ｂが成形される。さらに、この軸部素材３０ｂに対して図６に示す成形型５０を用いて押し込み方向と直交する側方押し出し成形を施すことにより、図４（ｄ）及び図５に示すように、車輪取り付けフランジ７と位置決め用筒部９が一体のハブ輪６が成形される。なお、この実施形態では、中実の軸部素材としたが、中空状の軸部素材を用いれば、駆動輪用のハブ輪も同様にして成形することができる。   4-6 shows an example of the cold forging process of the hub wheel 6. FIG. First, forward extrusion molding is performed on the solid round bar material 30 in FIG. 4A to form the shaft-shaped member 30a in FIG. 4B. Next, a head part 30b shown in FIG. 4C is formed by heading the head part of the shaft-like member 30a and immersing it to the same diameter as the outer diameter φD of the positioning cylinder part 9. Further, by subjecting the shaft material 30b to side extrusion perpendicular to the pressing direction using the molding die 50 shown in FIG. 6, as shown in FIGS. 4 (d) and 5, wheel mounting flanges are obtained. A hub wheel 6 in which the positioning cylinder portion 9 and the positioning cylinder portion 9 are integrated is formed. In this embodiment, a solid shaft portion material is used. However, if a hollow shaft portion material is used, a hub wheel for a drive wheel can be formed in the same manner.

図６は、ハブ輪６の側方押し出し成形工程に用いる成形型５０を示したものであり、（ａ）は素材投入時の状態を示し、（ｂ）は成形時の状態を示す。この成形型５０は、軸部素材３０ｂのインボード側の端部が投入される下金型５２と、弾性体５６によって下金型５２側に付勢される上金型５１とを備える。上金型５１には、位置決め用筒部９の外径φＤと略同径の孔５７が形成され、孔５７には軸部素材３０ｂのアウトボード側の端部（頭部）が配置される。また、該頭部の上方で孔５７内には、リングパンチ５５とパンチ５４が摺動自在に配置されており、これらは、弾性体５６を介して上金型５１が取り付けられた上型５８に固定される。また、上金型５１及び下金型５２の端面間には径方向外方に向かって延びる放射状溝５３が形成されている。なお、放射状溝５３は、上金型５１又は下金型５２のみに形成されてもよい。   FIGS. 6A and 6B show a molding die 50 used in the side extrusion molding process of the hub wheel 6, wherein FIG. 6A shows a state when the material is charged, and FIG. 6B shows a state when molding. The molding die 50 includes a lower die 52 into which an end portion on the inboard side of the shaft part material 30b is inserted, and an upper die 51 urged toward the lower die 52 by an elastic body 56. The upper mold 51 is formed with a hole 57 having substantially the same diameter as the outer diameter φD of the positioning cylinder portion 9, and an end portion (head) on the outboard side of the shaft portion material 30 b is disposed in the hole 57. . Further, a ring punch 55 and a punch 54 are slidably disposed in the hole 57 above the head, and these are an upper die 58 to which an upper die 51 is attached via an elastic body 56. Fixed to. A radial groove 53 extending outward in the radial direction is formed between the end surfaces of the upper mold 51 and the lower mold 52. The radial grooves 53 may be formed only in the upper mold 51 or the lower mold 52.

そして、上型５８を降下させると、まず、パンチ５４が軸部素材３０ｂの頭部上面に窪みを成形し、更にリングパンチ５５が軸部素材３０ｂの頭部端面に接して軸方向に圧縮することにより、軸部素材３０ｂの頭部外周部が放射状溝５３にパンチの進行方向とは直交する方向（側方）に押し出される。これにより、車輪取り付けフランジ７が軸部５と一体に成形され、該成形でのφＤの頭部の押し残り部が位置決め用筒部９となる。   When the upper die 58 is lowered, first, the punch 54 forms a recess on the upper surface of the head portion of the shaft portion material 30b, and the ring punch 55 further contacts the end surface of the head portion of the shaft portion material 30b and compresses in the axial direction. As a result, the outer peripheral portion of the head portion of the shaft material 30b is pushed into the radial groove 53 in a direction (side) perpendicular to the direction of punch movement. As a result, the wheel mounting flange 7 is formed integrally with the shaft portion 5, and the remaining portion of the φD head in the forming becomes the positioning cylinder portion 9.

このとき、成形荷重は頭部の内側面積のみに作用し、車輪取り付けフランジ７の長さ（面積）には影響されないので、車輪取り付けフランジ７の長さ（面積）が大きい場合は、車輪取り付けフランジ７を圧縮成形する場合と比較して極めて小さな成形荷重で成形できることになる。   At this time, since the molding load acts only on the inner area of the head and is not affected by the length (area) of the wheel mounting flange 7, when the length (area) of the wheel mounting flange 7 is large, the wheel mounting flange 7 can be molded with an extremely small molding load as compared with the case of compression molding.

次に、図７〜図９を参照して、外輪３の冷間鍛造工程の一例を示す。この例では、図７（ａ）の中空円筒状の軸部素材４０（この軸部素材は電縫管を切断する以外にも絞り成形して底抜き、あるいは後方押し出し成形して底抜き等でも得ることができる）に対して図９に示す成形型７０を用いて押し込み方向と直交する側方押し出し成形を施すことにより、図７（ｂ）及び図８に示すように、懸架装置取り付けフランジ１８と位置決め用筒部１９を一体に成形し、次いで、図７（ｃ）に示すように、アウトボード側の端部内径面に外輪軌道面１６に対応する段部４１を成形して外輪３を得る。   Next, an example of the cold forging process of the outer ring 3 will be described with reference to FIGS. In this example, the hollow cylindrical shaft material 40 of FIG. 7A (this shaft material is not only cut through the electric sewing tube but also drawn and bottomed, or backward extruded and bottomed, etc.) 9), by using the mold 70 shown in FIG. 9 to perform side extrusion perpendicular to the pushing direction, as shown in FIG. 7B and FIG. And the cylindrical portion 19 for positioning are integrally formed, and then, as shown in FIG. 7C, a step portion 41 corresponding to the outer ring raceway surface 16 is formed on the inner diameter surface of the end portion on the outboard side to form the outer ring 3. obtain.

図９は、外輪３の側方押し出し成形工程に用いる成形型７０を示したものであり、（ａ）は素材投入時の状態を示し、（ｂ）は成形時の状態を示す。この成形型７０は、軸部素材４０のアウトボード側の端部が投入される下金型７２と、弾性体７６によって下金型７２側に付勢される上金型７１とを備える。上金型７１には、位置決め用筒部１９の外径φＤ0 と略同径の孔７７が設けられ、孔７７には軸部素材４０のインボード側の端部が配置される。また、該端部の上方で孔７７内には、リングパンチ７５とパンチ７４が摺動自在に配置されており、これらは、弾性体７６を介して上金型７１が取り付けられた上型７８に固定される。なお、パンチ７４の先端部には、円筒形状の軸部素材４０を拘束するために該軸部素材４０の内径φＤ1 と略同径のマンドレル７４ａが設けられている。また、上金型７１及び下金型７２の端面間には径方向外方に向かって延びる放射状溝７３が形成される。なお、放射状溝７３は、上金型７１又は下金型７２のみに形成されてもよい。   FIG. 9 shows a molding die 70 used in the side extrusion molding process of the outer ring 3. FIG. 9A shows a state when the material is charged, and FIG. 9B shows a state when molding. The molding die 70 includes a lower die 72 into which an end on the outboard side of the shaft portion material 40 is inserted, and an upper die 71 urged toward the lower die 72 by an elastic body 76. The upper mold 71 is provided with a hole 77 having a diameter substantially the same as the outer diameter φD 0 of the positioning cylinder portion 19, and the end portion on the inboard side of the shaft portion material 40 is disposed in the hole 77. A ring punch 75 and a punch 74 are slidably disposed in the hole 77 above the end portion, and these are an upper die 78 to which an upper die 71 is attached via an elastic body 76. Fixed to. In addition, a mandrel 74a having the same diameter as the inner diameter φD1 of the shaft material 40 is provided at the tip of the punch 74 in order to constrain the cylindrical shaft material 40. Further, a radial groove 73 extending radially outward is formed between the end surfaces of the upper mold 71 and the lower mold 72. The radial grooves 73 may be formed only in the upper mold 71 or the lower mold 72.

そして、上型７８を降下させると、まず、パンチ７４が軸部素材４０のインボード側端部内径に外輪軌道面１７に対応する段部４２を成形し、更にリングパンチ７５が軸部素材４０のインボード側端面に接して軸方向に圧縮することにより、軸部素材４０の外周部が放射状溝７３にパンチの進行方向とは直交する方向（側方）に押し出されて懸架装置取り付けフランジ１８が軸部１５と一体に成形され、該成形でのφＤ0 の押し残り部が位置決め用筒部１９となる。   When the upper die 78 is lowered, first, the punch 74 forms the stepped portion 42 corresponding to the outer ring raceway surface 17 on the inboard side end inner diameter of the shaft portion material 40, and the ring punch 75 further forms the shaft portion material 40. , The outer peripheral portion of the shaft portion material 40 is pushed into the radial groove 73 in the direction (side) perpendicular to the direction of punch movement, and the suspension device mounting flange 18 is compressed. Is formed integrally with the shaft portion 15, and the remaining portion of φD 0 in the molding becomes the positioning cylinder portion 19.

このとき、成形荷重は軸部素材３０のφＤ0 〜φＤ1 のリング状部のみに作用し、懸架装置取り付けフランジ１８の長さ（面積）には影響されないので、懸架装置取り付けフランジ１８の長さ（面積）が大きい場合は、懸架装置取り付けフランジ１８を圧縮成形する場合と比較して極めて小さな成形荷重で成形できることになる。なお、放射状溝７３での素材の流動をバランスよく行なうために、下金型７２を上金型７１と同様に上下移動可能として弾性体で上金型７１側に付勢させてもよい（上下両側金型フローティング構造）。   At this time, the molding load acts only on the ring-shaped portion of φD0 to φD1 of the shaft material 30 and is not affected by the length (area) of the suspension device mounting flange 18, so the length (area) of the suspension device mounting flange 18 ) Is large, the suspension mounting flange 18 can be molded with a very small molding load as compared with the case of compression molding. In order to balance the flow of the material in the radial groove 73, the lower mold 72 may be moved up and down in the same manner as the upper mold 71 and may be urged toward the upper mold 71 by an elastic body (up and down Double-sided mold floating structure).

従って、本実施形態では、ハブ輪６の車輪取り付けフランジ７が冷間での側方押し出し成形によって中実状の軸部５と一体に成形されると共に、外輪３の懸架装置取り付けフランジ１８が冷間での側方押し出し成形によって中空状の軸部１５と一体に成形される。このため、押し出し成形の特徴から車輪取り付けフランジ７や懸架装置取り付けフランジ１８の押し出し長さ（面積）が大きくなっても成形荷重は変化せず、車輪取り付けフランジ７や懸架装置取り付けフランジ１８を圧縮成形する場合と比較して、冷間鍛造で比較的小さな設備を用いて低荷重で成形することができる。これにより、後工程での切削加工代が削減されて安価なハブ輪６及び外輪３を得ることができる。   Therefore, in this embodiment, the wheel mounting flange 7 of the hub wheel 6 is formed integrally with the solid shaft portion 5 by cold side extrusion, and the suspension device mounting flange 18 of the outer ring 3 is cold. Is formed integrally with the hollow shaft portion 15 by side extrusion molding. For this reason, the molding load does not change even if the extrusion length (area) of the wheel mounting flange 7 or the suspension device mounting flange 18 is increased due to the feature of the extrusion molding, and the wheel mounting flange 7 or the suspension device mounting flange 18 is compression molded. Compared with the case where it does, it can shape | mold by a low load using a comparatively small installation by cold forging. Thereby, the machining cost in a post process is reduced and the cheap hub wheel 6 and the outer ring | wheel 3 can be obtained.

また、車輪取り付けフランジ７とハブ輪６の外周部とのつなぎ部、及び懸架装置取り付けフランジ１８と外輪３の外周部とのつなぎ部分に曲げ加工を行なわないため、これらのつなぎ部分に十分な肉厚を確保することができ、強度的に十分なハブ輪６及び外輪３を得ることができる。   In addition, since bending is not performed on the connecting portion between the wheel mounting flange 7 and the outer peripheral portion of the hub wheel 6 and the connecting portion between the suspension device mounting flange 18 and the outer peripheral portion of the outer ring 3, a sufficient amount of meat is not provided in these connecting portions. Thickness can be ensured and the hub ring 6 and the outer ring 3 having sufficient strength can be obtained.

更に、車輪取り付けフランジ７及び懸架装置取り付けフランジ１８を側方押し出しにて成形しているので、押し残り部を車輪の位置決め用筒部９や車体の位置決め用筒部１９として用いることができ、これにより、周方向に連続する円筒状の位置決め用筒部９，１９を軸部５，１５と一体に高精度で容易に冷間成形することができ、また、これらの位置決め用筒部９，１９を別体にした場合に必要な取り付けのための余肉等が不要となるので、必要な部分の肉厚を確保した状態で材料歩留まりを良くすることができ、これにより、製造コストを低くすることができる。   Furthermore, since the wheel mounting flange 7 and the suspension device mounting flange 18 are formed by side extrusion, the unpressed portion can be used as a wheel positioning cylinder 9 or a vehicle positioning cylinder 19. Thus, the cylindrical positioning cylindrical portions 9 and 19 that are continuous in the circumferential direction can be easily cold-molded integrally with the shaft portions 5 and 15 with high precision, and these positioning cylindrical portions 9 and 19 can also be formed. Since there is no need for extra space for mounting when the is separated, the material yield can be improved while ensuring the thickness of the necessary part, thereby reducing the manufacturing cost. be able to.

なお、本発明は上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲において適宜変更可能である。
本実施形態では、内輪回転の従動輪用の車輪支持用ハブユニットの軌道輪部材を例示したが、内輪回転の駆動輪用、外輪回転の従動輪用或いは外輪回転の駆動輪用の車輪支持用ハブユニットの軌道輪部材に本発明を適用してもよいのは勿論である。 In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
In this embodiment, the raceway ring member of the wheel support hub unit for the driven wheel for inner ring rotation is illustrated, but for the wheel support for the driving wheel for inner ring rotation, the driven wheel for outer ring rotation, or the driving wheel for outer ring rotation. Of course, the present invention may be applied to the ring member of the hub unit.

また、本実施形態では、軸受部としてハブ輪６の端部に外輪３が外嵌された複列の転がり軸受を例示したが、これに代えて、軸受部として２列の単列アンギュラ玉軸受や２列の単列円すいころ軸受の他、内輪が軸方向の略中央部で分割された複列の転がり軸受を採用した車輪支持用ハブユニットの軌道輪部材に本発明を適用してもよい。   Further, in the present embodiment, the double row rolling bearing in which the outer ring 3 is fitted on the end of the hub wheel 6 is illustrated as the bearing portion, but instead of this, two rows of single row angular ball bearings are used as the bearing portion. The present invention may be applied to a raceway ring member of a wheel supporting hub unit that employs a double row rolling bearing in which the inner ring is divided at a substantially central portion in the axial direction in addition to the single row tapered roller bearing of two rows. .

本発明の車輪支持用ハブユニットの一例を説明するための断面図である。It is sectional drawing for demonstrating an example of the hub unit for wheel support of this invention. 車輪支持用ハブユニットの軌道輪部材としてのハブ輪を説明するための図で、（ａ）はその側面図であり、（ｂ）は（ａ）のII−II線に沿った断面図である。It is a figure for demonstrating the hub ring as a track ring member of the hub unit for wheel support, (a) is the side view, (b) is sectional drawing along the II-II line of (a). . 車輪支持用ハブユニットの軌道輪部材としての外輪を説明するための図で、（ａ）はその側面図であり、（ｂ）は（ａ）のIII-III線に沿った断面図である。It is a figure for demonstrating the outer ring | wheel as a bearing ring member of the hub unit for wheel support, (a) is the side view, (b) is sectional drawing along the III-III line of (a). ハブ輪の製造工程を説明するための図である。It is a figure for demonstrating the manufacturing process of a hub ring. 図４（ｄ）の矢印V方向から見た図である。It is the figure seen from the arrow V direction of FIG.4 (d). ハブ輪の側方押し出し成形型を説明するための断面図である。It is sectional drawing for demonstrating the side extrusion mold of a hub ring. 外輪の製造工程を説明するための図である。It is a figure for demonstrating the manufacturing process of an outer ring | wheel. 図７（ｂ）の矢印VIII方向から見た図である。It is the figure seen from the arrow VIII direction of FIG.7 (b). 外輪の側方押し出し成形型を説明するための断面図である。It is sectional drawing for demonstrating the side extrusion mold of an outer ring | wheel.

符号の説明Explanation of symbols

１ 車輪支持用ハブユニット
２ ハブ
３ 外輪（軌道輪部材）
４ 転動体
６ ハブ輪（軌道輪部材）
７ 車輪取り付けフランジ（取り付け部）
９，１９ 位置決め用筒部
１８ 懸架装置取り付けフランジ（取り付け部）
３０ｂ，４０ 軸部素材
５０，７０ 成形型
５１，７１ 下金型（金型）
５２，７２ 上金型（金型）
５３，７３ 放射状溝 1 Wheel support hub unit 2 Hub 3 Outer ring (Race member)
4 Rolling elements 6 Hub wheel (Raceway ring member)
7 Wheel mounting flange (mounting part)
9, 19 Cylindrical part for positioning 18 Suspension device mounting flange (mounting part)
30b, 40 Shaft material 50, 70 Mold 51, 71 Lower mold (mold)
52,72 Upper mold (mold)
53, 73 radial grooves

Claims (5)

中実又は中空状の軸部から径方向外方に延びる車輪又は車体を取り付ける取り付け部と、前記軸部と同心に配置された車輪又は車体の位置決めをする位置決め用筒部とを有する車輪支持用ハブユニットの軌道輪部材であって、
前記取り付け部は、軸方向の成形荷重を作用させて中実状又は中空状の軸部素材を圧縮する冷間での側方押し出し成形によって、前記軸方向の成形荷重が作用せずに前記軸部と直交する方向に放射状に延びて前記軸部と一体に形成されることを特徴とする車輪支持用ハブユニットの軌道輪部材。 For wheel support having a mounting portion for attaching a wheel or a vehicle body extending radially outward from a solid or hollow shaft portion, and a positioning cylinder portion for positioning the wheel or the vehicle body concentrically with the shaft portion. A ring member of the hub unit,
The mounting portion is formed by cold side extrusion that compresses a solid or hollow shaft material by applying an axial molding load, and the axial molding load does not act. A ring member for a wheel-supporting hub unit, which extends radially in a direction perpendicular to the shaft and is formed integrally with the shaft portion. 前記位置決め用筒部は前記側方押出成形の押し残り部によって前記取り付け部を挟んで前記軸部と反対側に、前記軸部と一体に形成されることを特徴とする請求項１に記載の車輪支持用ハブユニットの軌道輪部材。  The said positioning cylinder part is integrally formed with the said axial part on the opposite side to the said axial part on both sides of the said attaching part by the pressing remainder part of the said side extrusion molding. Wheel member for wheel support hub unit. 前記取り付け部は放射状に延びる複数のフランジ部から構成され、前記フランジ部にはそれぞれ取り付け孔が設けられ、前記各フランジ部は前記取り付け孔のピッチ円位置で繋がらないことを特徴とする請求項１又は２に記載の車輪支持用ハブユニットの軌道輪部材。  2. The mounting portion includes a plurality of radially extending flange portions, each of the flange portions is provided with a mounting hole, and the flange portions are not connected at a pitch circle position of the mounting hole. Or the track ring member of the hub unit for wheel support described in 2. 内方部材と、外方部材と、該内方部材と該外方部材との間に少なくとも転動体を有する軸受部が配設された車輪支持用ハブユニットであって、
前記内方部材と前記外方部材の少なくとも一方の部材が、請求項１〜３のいずれか１項に記載の前記軌道輪部材であることを特徴とする車輪支持用ハブユニット。 A wheel support hub unit in which an inner member, an outer member, and a bearing portion having at least a rolling element are disposed between the inner member and the outer member,
The wheel support hub unit according to any one of claims 1 to 3 , wherein at least one of the inner member and the outer member is the race ring member according to any one of claims 1 to 3 . 中実又は中空状の軸部から径方向外方に延びる車輪又は車体を取り付ける取り付け部と、前記軸部と同心に配置された車輪又は車体の位置決めをする位置決め用筒部とを有する車輪支持用ハブユニットの軌道輪部材の製造方法であって、
予め中実状又は中空状の軸部素材を所定の形状に成形し、径方向外方に向かって放射状に延びる溝を有する金型に配置する工程と、
前記軸部素材を冷間で軸方向に押し潰して圧縮し、前記金型の放射状の溝に前記軸部素材を流動させることにより、前記取り付け部を前記軸部と一体に側方押し出しにて成形する工程と、を備え、
前記取り付け部に軸方向の成形荷重を作用させずに形成することを特徴とする車輪支持用ハブユニットの軌道輪部材の製造方法。 For wheel support having a mounting portion for attaching a wheel or a vehicle body extending radially outward from a solid or hollow shaft portion, and a positioning cylinder portion for positioning the wheel or the vehicle body concentrically with the shaft portion. A method of manufacturing a bearing ring member of a hub unit,
Forming a solid or hollow shaft part material in a predetermined shape in advance and placing it in a mold having grooves radially extending outward in the radial direction; and
The shank material is compressed by crushing in the axial direction between the cold, by flowing the shank Material in radial grooves of the mold, laterally extruding the mounting portion integrally with the shaft portion And forming a process ,
Method of manufacturing a bearing ring member of the wheel support hub unit characterized that you formed without the action of axial forming load on the mounting part.
JP2004298585A 2004-10-13 2004-10-13 Wheel supporting hub unit, raceway member of wheel supporting hub unit, and manufacturing method thereof Expired - Lifetime JP4581615B2 (en)

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CN 200510103769 CN1760052B (en) 2004-10-13 2005-09-23 Hub unit with wheel support and bearing ring, and method of manufacturing the hub unit
EP05021050A EP1647418B1 (en) 2004-10-13 2005-09-27 Hub unit with wheel support and bearing ring, and method of manufacturing the hub unit
US11/239,314 US8402661B2 (en) 2004-10-13 2005-09-30 Wheel support hub unit, bearing ring member for wheel support hub unit, and method of manufacturing the same
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