JP5636977B2 - Wheel bearing device - Google Patents

Wheel bearing device Download PDF

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JP5636977B2
JP5636977B2 JP2011009054A JP2011009054A JP5636977B2 JP 5636977 B2 JP5636977 B2 JP 5636977B2 JP 2011009054 A JP2011009054 A JP 2011009054A JP 2011009054 A JP2011009054 A JP 2011009054A JP 5636977 B2 JP5636977 B2 JP 5636977B2
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bolt
wheel
hub
wheel mounting
press
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JP2012148679A (en
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悟志 北河
悟志 北河
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JTEKT Corp
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Description

本発明は、車輪用軸受装置に関し、特に自動車等の車輪を車輪取付用フランジにハブボルトを取り付けるための車輪用軸受装置に関する。   The present invention relates to a wheel bearing device, and more particularly to a wheel bearing device for attaching a hub bolt to a wheel mounting flange of a wheel of an automobile or the like.

従来の車輪用軸受装置として、中心軸線の回りに回転可能な内方部材と、この内方部材の外周囲に配置された外方部材と、この外方部材と内方部材との間に介在する複列の転動体とを備えたものがある（例えば特許文献１）。   As a conventional wheel bearing device, an inner member rotatable around a central axis, an outer member arranged around the inner member, and interposed between the outer member and the inner member There are those provided with a double row rolling element (for example, Patent Document 1).

内方部材は、ハブ軸及び内輪からなり、中心軸線上に回転可能に配置されている。ハブ軸は、車輪取付用フランジを外周面に有し、ドライブシャフトに等速自在継手を介してトルク伝達可能に連結され、かつナット止めされている。ハブ軸には、ハブボルトを用い、車輪取付用フランジを介して車輪及びブレーキロータが取り付けられている。内輪は、ハブ軸の車体側端部に取り付けられている。   The inner member includes a hub shaft and an inner ring, and is disposed rotatably on the central axis. The hub shaft has a wheel mounting flange on its outer peripheral surface, is connected to the drive shaft through a constant velocity universal joint so as to be able to transmit torque, and is nut-fastened. A hub bolt and a brake rotor are attached to the hub axle via a wheel mounting flange. The inner ring is attached to the end of the hub shaft on the vehicle body side.

外方部材は、車体取付用フランジを外周面に有し、車体側に懸架装置のナックルを介して取り付けられている。   The outer member has a vehicle body mounting flange on the outer peripheral surface, and is attached to the vehicle body side via a knuckle of a suspension device.

複列の転動体は、鋼球からなり、保持器によって転動可能に保持されている。車輪側列の転動体は外方部材の内周面とハブ軸の外周面との間に、また車体側列の転動体は外方部材の内周面と内輪の外周面との間にそれぞれ配置されている。   The double row rolling elements are made of steel balls and are held by a cage so as to be able to roll. The rolling elements of the wheel side row are between the inner peripheral surface of the outer member and the outer peripheral surface of the hub axle, and the rolling members of the vehicle body side row are between the inner peripheral surface of the outer member and the outer peripheral surface of the inner ring, respectively. Has been placed.

以上の構成により、車両のエンジン側からトルクがドライブシャフト，等速自在継手等を介してハブ軸に伝達されると、ハブ軸が内輪と共に回転する。ハブ軸には車輪が取り付けられているため、エンジン側からのトルクが車輪にも伝達され、車輪がハブ軸と共に回転する。   With the above configuration, when torque is transmitted from the engine side of the vehicle to the hub shaft via the drive shaft, constant velocity universal joint, or the like, the hub shaft rotates together with the inner ring. Since the wheel is attached to the hub axle, torque from the engine side is also transmitted to the wheel, and the wheel rotates together with the hub axle.

ところで、この種の車輪用軸受装置においては、車輪取付用フランジにハブボルトを圧入して挿通させるボルト挿通孔が設けられている。そして、ボルト挿通孔へのハブボルトの圧入力が大きいとフランジが歪み、回転振れ精度が劣化するおそれがあることが知られている。特許文献１の記載の発明では、ハブボルトの頭部を車輪取付用フランジに対して回転不能に係合させ、ハブボルトを適度の圧入締代で圧入することで、車輪取付用フランジの振れを抑制している。   By the way, in this kind of wheel bearing apparatus, the bolt insertion hole which press-fits and inserts a hub bolt in the wheel mounting flange is provided. And it is known that if the pressure input of the hub bolt to the bolt insertion hole is large, the flange may be distorted and the rotational runout accuracy may deteriorate. In the invention described in Patent Document 1, the head of the hub bolt is engaged with the wheel mounting flange in a non-rotatable manner, and the hub bolt is press-fitted with an appropriate press-fitting allowance, thereby suppressing the vibration of the wheel mounting flange. ing.

特開２００１−１９１７１５号公報JP 2001-191715 A

しかしながら、特許文献１に示す車輪用軸受装置によると、ハブボルトの頭部に係合する係合部とハブボルトの頭部との間を近接させる必要があるが、この係合部の底部（ハブボルトの圧入方向におけるハブボルトの頭部が当接する面との境目部分）を精度よく加工するのは現実的には困難である。従って、ハブボルトを圧入した際に、ハブボルトの中心軸が車輪取付用フランジに直交する方向に対して傾いてしまうおそれがあるという問題があった。   However, according to the wheel bearing device shown in Patent Document 1, it is necessary to bring the engaging portion engaged with the head portion of the hub bolt close to the head portion of the hub bolt. It is practically difficult to accurately process the boundary portion between the hub bolt head and the surface in contact with the head in the press-fitting direction. Therefore, when the hub bolt is press-fitted, there is a problem that the center axis of the hub bolt may be inclined with respect to the direction perpendicular to the wheel mounting flange.

従って、本発明の目的は、車輪取付用ボルトの圧入による車輪取付用フランジの変形を抑制しながら車輪取付用ボルトの傾きを抑制することができる車輪用軸受装置を提供することにある。   Accordingly, an object of the present invention is to provide a wheel bearing device capable of suppressing the inclination of the wheel mounting bolt while suppressing the deformation of the wheel mounting flange due to the press-fitting of the wheel mounting bolt.

本発明は、上記目的を達成するために、ボルト頭部及びボルトねじ部を有するとともに、前記ボルト頭部と前記ボルトねじ部との間に介在するボルト圧入部を有し、車輪を取り付けるための車輪取付用ボルトと、前記車輪取付用ボルトの前記ボルト圧入部を圧入して挿通させるボルト挿通孔を有する車輪取付用フランジが形成されたハブ軸と、前記ハブ軸を回転可能に支持する軸受とを備え、前記車輪取付用フランジの前記ボルト挿通孔は、前記車輪取付用ボルトを回り止めするボルト回り止め面、及び前記車輪取付用ボルトの前記ボルト頭部を軸方向に受けるボルト受面を有し、前記車輪取付用ボルトの前記ボルト頭部は、前記ボルト回り止め面に係合するボルト係合面、前記ボルト受面に当接するボルト当接面、及び前記ボルト係合面と前記ボルト当接面との間に介在し、前記ボルト挿通孔に圧入された状態で前記ボルト回り止め面及び前記ボルト受面に接触しない非接触面を有する車輪用軸受装置を提供する。   In order to achieve the above object, the present invention has a bolt head portion and a bolt screw portion, and has a bolt press-fitting portion interposed between the bolt head portion and the bolt screw portion, for attaching a wheel. A wheel mounting bolt, a hub shaft on which a wheel mounting flange having a bolt insertion hole for inserting and inserting the bolt press-fitting portion of the wheel mounting bolt is formed, and a bearing that rotatably supports the hub shaft The bolt insertion hole of the wheel mounting flange has a bolt detent surface that prevents the wheel mounting bolt from rotating, and a bolt receiving surface that receives the bolt head of the wheel mounting bolt in the axial direction. And the bolt head of the wheel mounting bolt includes a bolt engaging surface that engages with the bolt detent surface, a bolt abutting surface that contacts the bolt receiving surface, and the bolt engaging surface. Interposed between the serial bolt abutment surface, to provide a wheel bearing device having a non-contact surface while being pressed does not contact the bolt detent surface and the bolt receiving surface into the bolt insertion hole.

本発明によると、車輪取付用ボルトの圧入による車輪取付用フランジの変形を抑制しながら車輪取付用ボルトの傾きを抑制することができる。   According to the present invention, it is possible to suppress the inclination of the wheel mounting bolt while suppressing the deformation of the wheel mounting flange due to the press-fitting of the wheel mounting bolt.

（ａ）及び（ｂ）は、本発明の実施の形態に係る車輪用軸受装置の全体を説明するために示す断面図と側面図。（ａ）は断面図を、また（ｂ）は側面図をそれぞれ示す。(A) And (b) is sectional drawing and side view shown in order to demonstrate the whole wheel bearing apparatus which concerns on embodiment of this invention. (A) shows a sectional view, and (b) shows a side view. （ａ）及び（ｂ）は、本発明の実施の形態に係る車輪用軸受装置における車輪取付用ボルトの車輪取付用フランジへの取付状態を示す断面図と側面図。（ａ）は断面図を、また（ｂ）は側面図をそれぞれ示す。(A) And (b) is sectional drawing and side view which show the attachment state to the wheel mounting flange of the wheel mounting bolt in the wheel bearing apparatus which concerns on embodiment of this invention. (A) shows a sectional view, and (b) shows a side view. （ａ）及び（ｂ）は、本発明の実施の形態に係る車輪用軸受装置の車輪取付用ボルトを説明するために示す正面図と側面図。（ａ）は正面図を、また（ｂ）は側面図をそれぞれ示す。(A) And (b) is the front view and side view shown in order to demonstrate the wheel mounting volt | bolt of the wheel bearing apparatus which concerns on embodiment of this invention. (A) shows a front view, and (b) shows a side view. 本発明の実施の形態に係る車輪用軸受装置における車輪取付用ボルトの変形例を説明するために示す側面図。The side view shown in order to demonstrate the modification of the wheel mounting bolt in the wheel bearing apparatus which concerns on embodiment of this invention. （ａ）及び（ｂ）は、本発明の実施の形態に係る車輪用軸受装置における車輪取付用フランジの変形例を説明するために示す断面図。(A) And (b) is sectional drawing shown in order to demonstrate the modification of the wheel mounting flange in the wheel bearing apparatus which concerns on embodiment of this invention.

[実施の形態]
（車輪用軸受装置の全体構成）
図１（ａ）及び（ｂ）は車輪用軸受装置の全体を示す。図２（ａ）及び（ｂ）は車輪用軸受装置の要部を示す。図３（ａ）及び（ｂ）は車輪取付用ボルトを示す。図１に示すように、車輪用軸受装置１は、軸受２及びボルト取付機構３から大略構成されている。 [Embodiment]
(Whole configuration of wheel bearing device)
1 (a) and 1 (b) show the entire wheel bearing device. 2 (a) and 2 (b) show the main part of the wheel bearing device. 3A and 3B show wheel mounting bolts. As shown in FIG. 1, the wheel bearing device 1 is roughly composed of a bearing 2 and a bolt mounting mechanism 3.

（軸受２の構成）
軸受２は、図１（ａ）及び（ｂ）に示すように、中心軸線Ｏの回りに回転可能な内方部材４と、この内方部材４の外周囲に配置された外方部材５と、この外方部材５と内方部材４との間に介在する複列の転動体６，７とを備え、車体（図示せず）と車輪（図示せず）との間に配置されている。 (Configuration of bearing 2)
As shown in FIGS. 1A and 1B, the bearing 2 includes an inner member 4 that can rotate around the central axis O, and an outer member 5 that is disposed on the outer periphery of the inner member 4. These are provided with double-row rolling elements 6 and 7 interposed between the outer member 5 and the inner member 4, and are disposed between a vehicle body (not shown) and a wheel (not shown). .

内方部材４は、ハブ軸８及び内輪９からなり、中心軸線Ｏ上に回転可能に配置されている。   The inner member 4 includes a hub shaft 8 and an inner ring 9, and is disposed on the central axis O so as to be rotatable.

ハブ軸８は、各外径が互いに異なる大小２つの胴部８ａ，８ｂを有し、ドライブシャフト（図示せず）に等速自在継手（図示せず）等を介してトルク伝達可能に連結され、かつナット止めされ、全体が例えば中炭素鋼からなる略円筒状の成形体によって形成されている。ハブ軸８には、中心軸線Ｏに沿って両方向に開口する貫通孔８ｃが設けられている。貫通孔８ｃの内周部には、等速自在継手のステム（図示せず）を連結するためのセレーション８０ｃが形成されている。   The hub shaft 8 has two body portions 8a and 8b having different outer diameters, and is connected to a drive shaft (not shown) through a constant velocity universal joint (not shown) or the like so as to be able to transmit torque. And the whole is formed of a substantially cylindrical shaped body made of, for example, medium carbon steel. The hub axle 8 is provided with a through hole 8c that opens in both directions along the central axis O. A serration 80c for connecting a stem (not shown) of a constant velocity universal joint is formed on the inner peripheral portion of the through hole 8c.

大径の胴部８ａは、複列の転動体６，７のうち車輪側（図１の左側）列の転動体６を転動させる内側転動面８０ａを外周面に有し、ハブ軸８の車輪側に配置されている。   The large-diameter trunk portion 8a has an inner rolling surface 80a on the outer peripheral surface for rolling the rolling elements 6 in the wheel side (left side in FIG. 1) of the double-row rolling elements 6 and 7, and the hub axle 8 It is arranged on the wheel side.

小径の胴部８ｂは、内輪９を取り付けるための取付面８０ｂを外周面に有し、ハブ軸８の胴部８ａよりも車体側（図１の右側）に配置されている。   The small-diameter trunk portion 8 b has an attachment surface 80 b for attaching the inner ring 9 on the outer peripheral surface, and is disposed on the vehicle body side (right side in FIG. 1) with respect to the trunk portion 8 a of the hub axle 8.

一方、内輪９は、複列の転動体６，７のうち車体側列の転動体７を転動させる内側転動面９ａを有し、小径の胴部８ｂの取付面８０ｂに取り付けられ、全体が例えば冷間圧延鋼板からなる略円筒状の成形体によって形成されている。   On the other hand, the inner ring 9 has an inner rolling surface 9a for rolling the rolling elements 7 in the vehicle body side row among the double row rolling elements 6 and 7, and is attached to the mounting surface 80b of the small-diameter body portion 8b. Is formed by a substantially cylindrical shaped body made of, for example, a cold-rolled steel plate.

外方部材５は、複列の転動体６，７をそれぞれ転動させる外側転動面５ａ，５ｂを有し、車体側に懸架装置（図示せず）の構成部品としてのナックル（図示せず）を介して固定され、全体が中心軸線Ｏの両方向に開口する例えば中炭素鋼からなる略円筒状の成形体によって形成されている。外方部材５には、その外周面に突出する円環状の車体取付用フランジ５ｃが一体に設けられている。車体取付用フランジ５ｃには、円周方向に並列し、かつナックルボルト（図示せず）を挿通させる複数のボルト挿通孔５０ｃが設けられている。   The outer member 5 has outer rolling surfaces 5a and 5b for rolling the double-row rolling elements 6 and 7, respectively, and a knuckle (not shown) as a component of a suspension device (not shown) on the vehicle body side. ) And the whole is formed by a substantially cylindrical shaped body made of, for example, medium carbon steel that opens in both directions of the central axis O. The outer member 5 is integrally provided with an annular vehicle body mounting flange 5c protruding from the outer peripheral surface thereof. The vehicle body mounting flange 5c is provided with a plurality of bolt insertion holes 50c that are arranged in parallel in the circumferential direction and into which a knuckle bolt (not shown) is inserted.

（転動体６，７の構成）
一方側列の転動体６は、図１に示すように、鋼球からなり、外方部材５の外側転動面５ａとハブ軸８の内側転動面８０ａとの間に介在して配置され、かつボール保持器（図示せず）によって転動可能に保持されている。転動体６の車輪側には、外方部材５の内周面とハブ軸８の外周面との間に介在する車輪側のシール部材１０が配置されている。 (Configuration of rolling elements 6 and 7)
As shown in FIG. 1, the rolling elements 6 in one side row are made of steel balls and are disposed between the outer rolling surface 5 a of the outer member 5 and the inner rolling surface 80 a of the hub shaft 8. And a ball cage (not shown) so as to be able to roll. On the wheel side of the rolling element 6, a wheel side seal member 10 interposed between the inner peripheral surface of the outer member 5 and the outer peripheral surface of the hub shaft 8 is disposed.

他方側列の転動体７は、鋼球からなり、内輪９の内側転動面９ａと外方部材５の外側転動面５ｂとの間に介在して配置され、かつボール保持器（図示せず）によって転動可能に保持されている。転動体７の車体側には、外方部材５の内周面と内輪９の外周面との間に介在する車体側のシール部材１１が配置されている。   The rolling elements 7 in the other side row are made of steel balls, are disposed between the inner rolling surface 9a of the inner ring 9 and the outer rolling surface 5b of the outer member 5, and are provided with a ball cage (not shown). )) So that it can roll. On the vehicle body side of the rolling element 7, a vehicle body side seal member 11 interposed between the inner peripheral surface of the outer member 5 and the outer peripheral surface of the inner ring 9 is disposed.

（ボルト取付機構３の構成）
ボルト取付機構３は、図２（ａ）及び（ｂ）に示すように、円環状の車輪取付用フランジ１２と、この車輪取付用フランジ１２と共に車輪を取り付けるための車輪取付用ボルトとしてのハブボルト１３とを備えている。 (Configuration of bolt mounting mechanism 3)
As shown in FIGS. 2A and 2B, the bolt mounting mechanism 3 includes an annular wheel mounting flange 12 and a hub bolt 13 as a wheel mounting bolt for mounting a wheel together with the wheel mounting flange 12. And.

車輪取付用フランジ１２は、ハブ軸８における大径の胴部８ａ（図１に示す）の外周面に一体に設けられている。車輪取付用フランジ１２には、円周方向に並列し、かつハブボルト１３を圧入して挿通させる複数（本実施の形態では４個）のボルト挿通孔１２ａが設けられている。   The wheel mounting flange 12 is integrally provided on the outer peripheral surface of the large-diameter body portion 8a (shown in FIG. 1) of the hub shaft 8. The wheel mounting flange 12 is provided with a plurality (four in the present embodiment) of bolt insertion holes 12a that are juxtaposed in the circumferential direction and into which the hub bolts 13 are press-fitted and inserted.

各ボルト挿通孔１２ａは、そのボルト圧入側開口部に、ハブボルト１３の外周面に接触してハブボルト１３を回り止めする複数（本実施の形態では６個）のボルト回り止め面１２０ａ、ハブボルト１３のボルト頭部１３ａ（後述）を軸方向に受けるボルト受面１２１ａ、及びボルト受面１２１ａと複数のボルト回り止め面１２０ａとの間に介在する段状面１２２ａを有し、ハブボルト１３の圧入方向から見た場合に平面略正六角形状の開口面をもつ段状の凹部によって形成されている。ボルト挿通孔１２ａの内周面であって、ボルト圧入側開口部の軸方向に隣接する部位にはセレーション１２３ａが形成されている。ボルト受面１２１ａは、円環状に形成されており、その最大外径寸法は、ボルト挿通孔１２ａの軸線Ｏ１とボルト回り止め面１２０ａとの最小距離よりも小さく形成されている。 Each of the bolt insertion holes 12a has a plurality of (six in this embodiment) bolt rotation prevention surfaces 120a and 6 that prevent the hub bolts 13 from rotating in contact with the outer peripheral surface of the hub bolt 13 at the bolt press-fitting side opening. A bolt receiving surface 121a for receiving a bolt head 13a (described later) in the axial direction, and a stepped surface 122a interposed between the bolt receiving surface 121a and the plurality of bolt detent surfaces 120a, from the press-fitting direction of the hub bolt 13 When viewed, it is formed by a step-shaped recess having a substantially regular hexagonal opening surface. A serration 123a is formed on a portion of the inner peripheral surface of the bolt insertion hole 12a adjacent to the axial direction of the bolt press-fitting side opening. Bolt receiving surface 121a is formed in an annular shape, the maximum outer diameter dimension is smaller than the minimum distance between the axis O 1 and the bolt detent surface 120a of the bolt insertion hole 12a.

複数のボルト回り止め面１２０ａは、それぞれがボルト挿通孔１２ａの軸線Ｏ１の周方向に対して傾斜するように形成され、ボルト挿通孔１２ａにおける略正六角形状の開口周縁に沿って並列し、ボルト挿通孔１２ａにおけるボルト圧入側開口部の車体側に配置されている。 A plurality of bolts detent surface 120a are each formed so as to be inclined with respect to the circumferential direction of the axis O 1 of the bolt insertion holes 12a, parallel along a substantially regular hexagonal opening peripheral edge of the bolt insertion holes 12a, It arrange | positions at the vehicle body side of the bolt press-fit side opening part in the bolt insertion hole 12a.

ボルト受面１２１ａは、ボルト挿通孔１２ａの軸線Ｏ１回りに沿って円環状に形成された平坦なボルト着座面で形成され、ボルト挿通孔１２ａにおけるボルト圧入側開口部の車輪側に配置されている。これにより、ボルト挿通孔１２ａに対するハブボルト１３の圧入時にハブボルト１３のボルト頭部１３ａに軸方向から接触し、ハブボルト１３の傾きを抑制する。ボルト受面１２１ａの形成は、車輪取付用フランジ１２の鍛造加工後に座ぐり加工を施すことにより行われる。 Bolt receiving surface 121a is formed in a flat bolt seating surface formed in an annular shape along the axis O 1 around the bolt insertion holes 12a, it is arranged on the wheel side of the bolt press-fitting-side opening of the bolt insertion hole 12a Yes. Thereby, when the hub bolt 13 is press-fitted into the bolt insertion hole 12a, the hub head 13a of the hub bolt 13 is contacted from the axial direction, and the inclination of the hub bolt 13 is suppressed. The bolt receiving surface 121a is formed by spot facing after forging the wheel mounting flange 12.

段状面１２２ａは、複数のボルト回り止め面１２０ａの並列方向に沿った略正六角形の外輪郭、及びボルト受面１２１ａの円周方向に沿った略円形の内輪郭をもつ形状を呈し、複数のボルト回り止め面１２０ａとボルト受面１２１ａとの間に介在してボルト挿通孔１２ａにおけるボルト圧入側開口部の軸線方向の中央部に配置されている。   The stepped surface 122a has a shape having a substantially regular hexagonal outer contour along the parallel direction of the plurality of bolt detent surfaces 120a and a substantially circular inner contour along the circumferential direction of the bolt receiving surface 121a. The bolt rotation stop surface 120a and the bolt receiving surface 121a are interposed between the bolt insertion hole 12a and the bolt press-fitting side opening at the center in the axial direction.

一方、ハブボルト１３は、図３（ａ）及び（ｂ）に示すように、ボルト頭部１３ａ，ボルト圧入部１３ｂ，及びボルトねじ部１３ｃを有している。ハブボルト１３は、ボルト挿通孔１２ａに圧入されて車輪取付用フランジ１２に取り付けられる。   On the other hand, as shown in FIGS. 3A and 3B, the hub bolt 13 has a bolt head portion 13a, a bolt press-fit portion 13b, and a bolt screw portion 13c. The hub bolt 13 is press-fitted into the bolt insertion hole 12 a and attached to the wheel mounting flange 12.

ボルト頭部１３ａは、ボルト回り止め面１２０ａに周方向に係合するボルト係合面１３０ａ、ボルト受面１２１ａに軸方向に当接するボルト当接面１３１ａ、及びボルト挿通孔１２ａの段状面１２２ａに所定の間隔をもって対向する車輪側端面１３２ａを有する平面略正六角形状の段付き頭部からなり、ハブボルト１２の車体側に配置されている。   The bolt head 13a includes a bolt engaging surface 130a that engages the bolt detent surface 120a in the circumferential direction, a bolt contact surface 131a that contacts the bolt receiving surface 121a in the axial direction, and a stepped surface 122a of the bolt insertion hole 12a. And a stepped head having a substantially regular hexagonal shape having a wheel-side end face 132a facing each other at a predetermined interval, and is disposed on the vehicle body side of the hub bolt 12.

ボルト当接面１３１ａは、ボルト係合面１３０ａの軸方向の端部よりも圧入方向側（ボルトねじ部１３ｃの側）に突出した部分の軸方向端面として形成されている。また、ボルト当接面１３１ａは、ボルト受面１２１ａに面接触する円環状の平坦な面に形成されている。   The bolt contact surface 131a is formed as an axial end surface of a portion protruding to the press-fitting direction side (the bolt screw portion 13c side) from the axial end portion of the bolt engaging surface 130a. The bolt contact surface 131a is formed on an annular flat surface that is in surface contact with the bolt receiving surface 121a.

車輪側端面１３２ａは、ボルト係合面１３０ａが外周面に形成された部分の軸方向の端面であり、ハブボルト１３がボルト挿通孔１２ａに圧入された状態で、ボルト回り止め面１２０ａにもボルト受面１２１ａにも接触しない非接触面として構成されている。   The wheel-side end surface 132a is an axial end surface of the portion where the bolt engaging surface 130a is formed on the outer peripheral surface, and the hub bolt 13 is press-fitted into the bolt insertion hole 12a and the bolt detent surface 120a also receives the bolt. It is configured as a non-contact surface that does not contact the surface 121a.

ボルト圧入部１３ｂは、ボルト頭部１３ａとボルトねじ部１３ｃとの間に介在して配置されている。ボルト圧入部１３ｂには、ボルト挿通孔１２ａのセレーション１２３ａに対応するセレーション１３０ｂが形成されている。   The bolt press-fit portion 13b is disposed between the bolt head portion 13a and the bolt screw portion 13c. A serration 130b corresponding to the serration 123a of the bolt insertion hole 12a is formed in the bolt press-fitting portion 13b.

ボルトねじ部１３ｃはハブボルト１３の車輪側に配置されている。そして、ボルトねじ部１３ｃは、ハブナット（図示せず）を螺合して車輪取付用フランジ１２に車輪をブレーキロータと共に取り付けるように構成されている。   The bolt screw portion 13 c is disposed on the wheel side of the hub bolt 13. The bolt screw portion 13c is configured to screw a hub nut (not shown) and attach the wheel to the wheel attachment flange 12 together with the brake rotor.

（ハブボルト１３の車輪取付用フランジ１２への取り付け）
ハブボルト１３の車輪取付用フランジ１２への取り付けは、ボルト頭部１３ａのボルト係合面１３０ａがボルト挿通孔１２ａのボルト回り止め面１２０ａに係合し、またボルト頭部１３ａのボルト当接面１３１ａがボルト挿通孔１２ａのボルト受面１２１ａに当接するまで、ハブボルト１３のボルト圧入部１３ｂを車輪取付用フランジ１２のボルト挿通孔１２ａ内に圧入して挿通させることにより行われる。 (Mounting of hub bolt 13 to wheel mounting flange 12)
The hub bolt 13 is attached to the wheel mounting flange 12 by engaging the bolt engaging surface 130a of the bolt head 13a with the bolt detent surface 120a of the bolt insertion hole 12a, and the bolt contact surface 131a of the bolt head 13a. Until the bolt is in contact with the bolt receiving surface 121a of the bolt insertion hole 12a, the bolt press-fitting portion 13b of the hub bolt 13 is pressed into the bolt insertion hole 12a of the wheel mounting flange 12 and inserted therethrough.

ハブボルト１３のボルト挿通孔１２ａへの圧入により、ボルト圧入部１３ｂのセレーション１３０ｂとボルト挿通孔１２ａのセレーション１２３ａとが相互に噛み合い、ハブボルト１３が車輪取付用フランジ１２に取り付けられる。   By press-fitting the hub bolt 13 into the bolt insertion hole 12a, the serration 130b of the bolt press-fitting portion 13b and the serration 123a of the bolt insertion hole 12a are engaged with each other, and the hub bolt 13 is attached to the wheel mounting flange 12.

[実施の形態の効果]
以上説明した実施の形態によれば、次に示す効果が得られる。 [Effect of the embodiment]
According to the embodiment described above, the following effects can be obtained.

（１）ハブボルト１３の回り止めをボルト圧入部１３ｂのみで行うことができる程度の圧入締代でハブボルト１３を圧入する場合に比べ、圧入締代を小さくできるので、圧入による車輪取付用フランジ１２の変形を抑制することができ、車輪取付用フランジ１２の面振れ精度を高めることができる。 (1) Compared to the case where the hub bolt 13 is press-fitted with a press-fit tightening allowance that can prevent the hub bolt 13 from being rotated only by the bolt press-fitting portion 13b, the press-fit tightening allowance can be reduced. The deformation can be suppressed, and the surface runout accuracy of the wheel mounting flange 12 can be increased.

（２）ボルト頭部１３ａの車輪側端面１３２ａがボルト挿通孔１２ａの段状面１２２ａに所定の間隔をもって対向しているため、すなわちボルト挿通孔１２ａの段状面１２２ａとボルト頭部１３ａの車輪側端面１３２ａとの間に環状の空隙が形成されているため、ボルト回り止め面１２０ａの軸方向の端部（ボルト回り止め面１２０ａと段状面１２２ａとの境界部）の加工誤差があったとしても、それに影響されることなく、ボルト当接面１３１ａがボルト受面１２１ａに当接し、ハブボルト１３の傾きを抑制できる。 (2) Since the wheel side end surface 132a of the bolt head 13a faces the stepped surface 122a of the bolt insertion hole 12a with a predetermined interval, that is, the stepped surface 122a of the bolt insertion hole 12a and the wheel of the bolt head 13a. Since an annular gap is formed between the side end surface 132a, there is a machining error at the axial end of the bolt detent surface 120a (the boundary between the bolt detent surface 120a and the stepped surface 122a). However, the bolt abutment surface 131a abuts on the bolt receiving surface 121a without being affected by this, and the inclination of the hub bolt 13 can be suppressed.

以上、本発明のボルト取付機構及び車輪用軸受装置を上記の実施の形態に基づいて説明したが、本発明は上記の実施の形態に限定されるものではなく、その要旨を逸脱しない範囲で種々の態様において実施することが可能であり、例えば次に示すような変形も可能である。   As described above, the bolt mounting mechanism and the wheel bearing device of the present invention have been described based on the above-described embodiment, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. For example, the following modifications are possible.

（１）上記実施の形態では、ハブボルト１３のボルト頭部１３ａが平面略正六角形状の段付き頭部からなる場合について説明したが、本発明はこれに限定されず、ボルト頭部は例えば平面略四角形や平面略八角形など平面多角形状であってもよい。すなわち、ハブボルト１３のボルト頭部１３ａの外周面は、その少なくとも一部がハブボルト１３の中心軸の周方向に対して傾斜した平面又は曲面に形成され、ボルト回り止め面１２０ａは、ボルト頭部１３ａの外周面の形状に対応して回り止めを行うことが可能な形状を有していればよい。 (1) In the above embodiment, the case where the bolt head 13a of the hub bolt 13 is a stepped head having a substantially regular hexagonal shape has been described. However, the present invention is not limited to this, and the bolt head is, for example, a flat surface. It may be a planar polygonal shape such as a substantially quadrangular shape or a substantially planar octagonal shape. That is, at least a part of the outer peripheral surface of the bolt head 13a of the hub bolt 13 is formed into a flat surface or a curved surface inclined with respect to the circumferential direction of the central axis of the hub bolt 13, and the bolt detent surface 120a is formed of the bolt head 13a. It is only necessary to have a shape capable of preventing rotation corresponding to the shape of the outer peripheral surface of the.

また、図４に示すようなボルト頭部２０ａを有するハブボルト２０であってもよい。図４において、ハブボルト２０のボルト頭部２０ａには、円周方向に所定の間隔をもって並列する凸部２００ａが一体に設けられ、凸部２００ａの外面がボルト回り止め面に相当する。この場合、ボルト挿通孔内には、凸部２００ａに対応し、かつハブボルト２０を回り止めするボルト回り止め部としての凹部が設けられる。   Moreover, the hub bolt 20 which has the bolt head 20a as shown in FIG. 4 may be sufficient. In FIG. 4, the bolt head 20a of the hub bolt 20 is integrally provided with convex portions 200a arranged in parallel in the circumferential direction at a predetermined interval, and the outer surface of the convex portion 200a corresponds to a bolt detent surface. In this case, in the bolt insertion hole, a concave portion is provided as a bolt anti-rotation portion that corresponds to the convex portion 200a and prevents the hub bolt 20 from rotating.

（２）上記実施の形態では、ボルト挿通孔１２ａが段状面１２２ａを有する凹部によって形成された場合について説明したが、本発明はこれに限定されず、図５（ａ）に示すように段状面１２２ａを有しないボルト挿通孔１２ａによって形成してもよい。この場合、ハブボルト１３の車輪側端面１３２ａがボルト挿通孔１２ａのボルト受面１２１ａに所定の間隔をもって対向する。 (2) In the above embodiment, the case where the bolt insertion hole 12a is formed by the concave portion having the stepped surface 122a has been described. However, the present invention is not limited to this, and a step as shown in FIG. You may form by the bolt penetration hole 12a which does not have the shape surface 122a. In this case, the wheel side end surface 132a of the hub bolt 13 faces the bolt receiving surface 121a of the bolt insertion hole 12a with a predetermined interval.

（３）上記実施の形態では、ハブボルト１３のボルト頭部１３ａが、ボルト当接面１３１ａと車輪側端面１３２ａとの間に段付き形状を有するように形成された場合について説明したが、本発明はこれに限定されず、図５（ｂ）に示すように、ボルト当接面１３１ａの径方向の端部からボルト係合面１３０ａに向かって円錐状に拡径するテーパ面１３３ａを有するように形成してもよい。この場合、テーパ面１３３ａがボルト回り止め面１２０ａにもボルト受面１２１ａにも接触しない非接触面となる。 (3) In the above embodiment, the case where the bolt head 13a of the hub bolt 13 is formed to have a stepped shape between the bolt contact surface 131a and the wheel side end surface 132a has been described. However, as shown in FIG. 5B, the tapered surface 133a has a conical diameter increasing from the end in the radial direction of the bolt contact surface 131a toward the bolt engaging surface 130a. It may be formed. In this case, the taper surface 133a is a non-contact surface that does not contact the bolt detent surface 120a or the bolt receiving surface 121a.

（４）上記実施の形態では、転動体６，７が共に鋼球である場合について説明したが、本発明はこれに限定されず、例えば円筒ローラあるいは円錐ローラからなる転動体であってもよい。 (4) In the above-described embodiment, the case where the rolling elements 6 and 7 are both steel balls has been described. However, the present invention is not limited to this, and may be a rolling element including, for example, a cylindrical roller or a conical roller. .

（５）上記実施の形態では、フランジ一体型のハブ軸８に適用する場合について説明したが、本発明はこれに限定されず、例えば車輪取付用フランジ単体あるいはドライブシャフト一体型ハブにも本実施の形態と同様に適用可能である。 (5) In the above embodiment, the case of application to the flange-integrated hub shaft 8 has been described. However, the present invention is not limited to this. For example, the present invention is also applied to a wheel mounting flange or a drive shaft-integrated hub. It is applicable in the same manner as in

１…車輪用軸受装置、２…軸受、３…ボルト取付機構、４…内方部材、５…外方部材、５ａ，５ｂ…外側転動面、５ｃ…車体取付用フランジ、５０ｃ…ボルト挿通孔、６，７…転動体、８…ハブ軸、８ａ…大径の胴部、８ｂ…小径の胴部、８ｃ…貫通孔、８０ａ…内側転動面、８０ｃ…セレーション、９…内輪、９ａ…内側転動面、１０，１１…シール部材、１２…車輪取付用フランジ、１２ａ…ボルト挿通孔、１２０ａ…ボルト回り止め面、１２１ａ…ボルト受面、１２２ａ…段状面、１２３ａ…セレーション、１３…ハブボルト、１３ａ…ボルト頭部、１３０ａ…ボルト係合面、１３１ａ…ボルト当接面、１３２ａ…車輪側端面、１３ｂ…ボルト圧入部、１３０ｂ…セレーション、１３ｃ…ボルトねじ部、Ｏ…中心軸線、Ｏ１…軸線 DESCRIPTION OF SYMBOLS 1 ... Wheel bearing apparatus, 2 ... Bearing, 3 ... Bolt attachment mechanism, 4 ... Inner member, 5 ... Outer member, 5a, 5b ... Outer rolling surface, 5c ... Body mounting flange, 50c ... Bolt insertion hole 6, 7 ... rolling elements, 8 ... hub axle, 8a ... large diameter barrel, 8b ... small diameter barrel, 8c ... through hole, 80a ... inner rolling surface, 80c ... serration, 9 ... inner ring, 9a ... Inner rolling surface, 10, 11 ... seal member, 12 ... wheel mounting flange, 12a ... bolt insertion hole, 120a ... bolt detent surface, 121a ... bolt receiving surface, 122a ... stepped surface, 123a ... serration, 13 ... Hub bolt, 13a ... bolt head, 130a ... bolt engagement surface, 131a ... bolt contact surface, 132a ... wheel side end face, 13b ... bolt press-fit portion, 130b ... serration, 13c ... bolt screw portion, O ... center axis, O 1 ... axis

Claims (2)

ボルト頭部及びボルトねじ部を有するとともに、前記ボルト頭部と前記ボルトねじ部との間に介在するボルト圧入部を有し、車輪を取り付けるための車輪取付用ボルトと、
前記車輪取付用ボルトの前記ボルト圧入部を圧入して挿通させるボルト挿通孔を有する車輪取付用フランジが形成されたハブ軸と、
前記ハブ軸を回転可能に支持する軸受とを備え、
前記車輪取付用フランジの前記ボルト挿通孔は、前記車輪取付用ボルトを回り止めするボルト回り止め面、及び前記車輪取付用ボルトの前記ボルト頭部を軸方向に受けるボルト受面を有し、
前記車輪取付用ボルトの前記ボルト頭部は、前記ボルト回り止め面に係合するボルト係合面、前記ボルト受面に当接するボルト当接面、及び前記ボルト係合面と前記ボルト当接面との間に介在し、前記ボルト挿通孔に圧入された状態で前記ボルト回り止め面及び前記ボルト受面に接触しない非接触面を有する
車輪用軸受装置。 A bolt head and a bolt screw portion, a bolt press-fit portion interposed between the bolt head portion and the bolt screw portion, and a wheel mounting bolt for mounting a wheel;
A hub shaft on which a wheel mounting flange having a bolt insertion hole for inserting and inserting the bolt press-fitting portion of the wheel mounting bolt is formed;
A bearing that rotatably supports the hub shaft;
The bolt insertion hole of the wheel mounting flange has a bolt detent surface that prevents the wheel mounting bolt from rotating, and a bolt receiving surface that receives the bolt head of the wheel mounting bolt in the axial direction,
The bolt head of the wheel mounting bolt includes a bolt engaging surface that engages with the bolt detent surface, a bolt abutting surface that abuts on the bolt receiving surface, and the bolt engaging surface and the bolt abutting surface. And a non-contact surface that does not contact the bolt detent surface and the bolt receiving surface in a state of being press-fitted into the bolt insertion hole. 前記車輪取付用フランジは、前記ボルト挿通孔のボルト圧入側開口部が前記ボルト回り止め面と前記ボルト受面との間に介在し、かつ前記ボルト頭部の前記非接触面に対向する段状面を有する請求項１に記載の車輪用軸受装置。

The wheel mounting flange is stepped bolt press-side opening of the bolt insertion hole is interposed between the bolt receiving surface and the bolt detent surface, and facing the non-contact surface of the bolt head The wheel bearing device according to claim 1, comprising a surface.

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