JP5045725B2 - Rolling bearing unit with rotational speed detector - Google Patents

Rolling bearing unit with rotational speed detector Download PDF

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JP5045725B2
JP5045725B2 JP2009239443A JP2009239443A JP5045725B2 JP 5045725 B2 JP5045725 B2 JP 5045725B2 JP 2009239443 A JP2009239443 A JP 2009239443A JP 2009239443 A JP2009239443 A JP 2009239443A JP 5045725 B2 JP5045725 B2 JP 5045725B2
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hole
bottom plate
cover
cap nut
inner end
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JP2010047254A (en
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俊秋 前田
寛朗 石川
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NSK Ltd
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NSK Ltd
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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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • 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
    • F16C33/72—Sealings
    • F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a structure that allows a holder 28, holding a sensor 4, to be installed on a metal cover 22, and prevents foreign matters from entering the cover 22, while lowering costs. <P>SOLUTION: An insertion hole 26 and a through-hole 27 are formed at a bottom plate section 24 of the cover 22. An insertion section 29, holding a sensor on the fore-end section of the holder 28, is inserted to the insertion hole 26. A cap nut 31 for screwing with a bolt 37 inserted into a mounting hole 36 at the fore-end section of a mounting flange 35 provided on the holder 28, is fixed with the bottom plate section 24 at the section of through-hole 27, by allowing a part of the bottom plate section 24 to be plastic deformed. A minute gap existing in the connection section between the cap nut 31 and the bottom plate section 24 is sealed by painting. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

この発明に係る回転速度検出装置付転がり軸受ユニットは、自動車の車輪を懸架装置に対して回転自在に支持すると共に、この車輪の回転速度を検出する為に利用する。   The rolling bearing unit with a rotational speed detecting device according to the present invention supports the wheel of an automobile so as to be rotatable with respect to the suspension device, and is used for detecting the rotational speed of the wheel.

自動車の車輪を懸架装置に対して回転自在に支持するのに、転がり軸受ユニットを使用する。又、アンチロックブレーキシステム（ＡＢＳ）やトラクションコントロールシステム（ＴＣＳ）、或はビークルスタビリティコントロール装置（ＶＳＣ）等の車両用走行状態安定化装置を制御する為には、上記車輪の回転速度を検出する必要がある。この為に使用する回転速度検出装置付転がり軸受ユニットとして、例えば特許文献１〜２に記載されたものが、従来から知られている。このうちの特許文献１に記載された従来構造の場合には、使用時にも回転しない外輪の軸方向内端（軸方向に関して内とは、車両への組み付け状態で幅方向中央側を言う。反対に、車両への組み付け状態で幅方向外側を、軸方向に関して外と言う。本明細書及び特許請求の範囲全体で同じ。）部に嵌合固定したカバーにセンサを、このカバーに溶接固定したボルトを利用して支持固定している。又、特許文献２に記載された従来構造の場合には、金属製のカバーの一部に設けた有底の凹部に内嵌固定したナット或はボルトを利用して、このカバーに対しセンサを支持固定している。   A rolling bearing unit is used to rotatably support the wheels of the automobile with respect to the suspension system. In addition, in order to control a vehicle running state stabilization device such as an anti-lock brake system (ABS), a traction control system (TCS), or a vehicle stability control device (VSC), the rotational speed of the wheel is detected. There is a need to. As a rolling bearing unit with a rotational speed detection device used for this purpose, for example, those described in Patent Documents 1 and 2 are conventionally known. Among these, in the case of the conventional structure described in Patent Document 1, the inner end in the axial direction of the outer ring that does not rotate during use (inner with respect to the axial direction means the center in the width direction in the assembled state to the vehicle. In the assembled state to the vehicle, the outside in the width direction is referred to as the outside in the axial direction.The same applies throughout this specification and claims.) A sensor is welded and fixed to the cover. It is supported and fixed using bolts. In the case of the conventional structure described in Patent Document 2, a sensor is attached to the cover by using a nut or bolt that is fitted and fixed in a bottomed recess provided in a part of a metal cover. The support is fixed.

上述した様な従来構造のうち、特許文献１に記載された構造の場合には、カバーとボルトの座面との間から、泥水等の異物がこのカバー内に侵入する可能性がある。上記特許文献１に記載された構造の場合、転がり軸受ユニットのうちで転動体を設置した部分の軸方向内端側を密封する為のシール部材が組み付けられていないが、実際の場合には、上記カバー内に侵入した異物が上記部分に迄入り込むのを防止する為のシール部材が必要になる。そして、この様なシール部材を設ける事に伴って、製造コストが嵩むだけでなく、転がり軸受ユニットの回転抵抗（動トルク）が大きくなると言った問題を生じる。又、特許文献２に記載された構造の場合には、金属製のカバーの一部に有底の凹部を形成し、この凹部内にナット或はボルトを内嵌固定する作業が面倒で、コストが嵩む原因となる。   Among the conventional structures as described above, in the case of the structure described in Patent Document 1, foreign matter such as muddy water may enter the cover from between the cover and the seating surface of the bolt. In the case of the structure described in Patent Document 1, a seal member for sealing the axially inner end of the portion where the rolling element is installed in the rolling bearing unit is not assembled, but in an actual case, A seal member is required to prevent foreign matter that has entered the cover from entering the cover. The provision of such a sealing member not only increases the manufacturing cost, but also causes a problem that the rotational resistance (dynamic torque) of the rolling bearing unit increases. In addition, in the case of the structure described in Patent Document 2, it is troublesome to form a bottomed recess in a part of a metal cover and to fit and fix a nut or bolt in the recess. Cause the increase.

実開平７−３１５３９号公報Japanese Utility Model Publication No. 7-31539 特許第３４４０８００号公報Japanese Patent No. 3440800

本発明は、上述の様な事情に鑑み、カバー内に異物が入り込む事を防止できる構造を低コストで実現すべく発明したものである。   In view of the circumstances as described above, the present invention was invented to realize a structure capable of preventing foreign matter from entering a cover at a low cost.

本発明の回転速度検出装置付転がり軸受ユニットは何れも、外輪と、ハブと、複数個の転動体と、エンコーダと、カバーと、挿入孔と、センサとを備える。
このうちの外輪は、内周面に外輪軌道を有し、使用時にも回転しない。
又、上記ハブは、外周面に内輪軌道を有し、使用時に回転する。
又、上記各転動体は、この内輪軌道と上記外輪軌道との間に転動自在に設けられている。
又、上記エンコーダは、上記ハブの軸方向内端部若しくは内端寄り部分に、このハブと同心に固定されたもので、その被検出面の特性を、円周方向に関して交互に変化させている。
又、上記カバーは、上記外輪の軸方向内端部に、この外輪の軸方向内端開口部を塞ぐ状態で固定されたもので、金属板製で円筒部の軸方向内端部を底板部で塞いだ有底円筒状である。
又、上記挿入孔は、上記カバーの一部で上記エンコーダと対向する部分に設けられている。
又、上記センサは、上記エンコーダの被検出面に対向する状態で設けられ、このエンコーダの回転に伴って出力を変化させるものである。
又、上記センサはホルダに保持されており、このホルダは、このセンサを保持した状態で上記挿入孔に挿入される挿入部と、この挿入部の軸方向内端部にその基端部を結合した取付フランジ部とを備えている。 Each of the rolling bearing units with a rotational speed detecting device of the present invention includes an outer ring, a hub, a plurality of rolling elements, an encoder, a cover, an insertion hole, and a sensor.
Of these, the outer ring has an outer ring raceway on the inner peripheral surface, and does not rotate during use.
The hub has an inner ring raceway on the outer peripheral surface, and rotates during use.
Each rolling element is provided between the inner ring raceway and the outer ring raceway so as to roll freely.
Further, the encoder is fixed concentrically to the hub at an inner end portion in the axial direction of the hub or a portion near the inner end, and the characteristics of the detected surface are alternately changed in the circumferential direction. .
The cover is fixed to the inner end of the outer ring in the axial direction so as to block the inner end opening of the outer ring in the axial direction. It is a bottomed cylindrical shape closed with
The insertion hole is provided in a part of the cover facing the encoder.
The sensor is provided in a state of facing the detection surface of the encoder, and changes the output as the encoder rotates.
The sensor is held by a holder, and the holder is connected to an insertion portion that is inserted into the insertion hole while holding the sensor, and a base end portion is connected to an axially inner end portion of the insertion portion. Mounting flange portion.

特に、請求項１に記載した回転速度検出装置付転がり軸受ユニットに於いては、上記カバーのうち、上記ホルダの挿入部を上記挿入孔に挿入した状態で上記取付フランジの先端部に形成した取付孔が対向する部分に、上記カバーの軸方向両側面同士を通じさせる貫通孔が形成されている。
そして、この貫通孔部分で上記底板部の軸方向外側面に、軸方向外端部が閉じられ、軸方向内端面の中央部にねじ孔が開口し、軸方向内端面に突出部が設けられた袋ナットが、このねじ孔と上記貫通孔とを整合させた状態で、この突出部をこの貫通孔に内嵌する事により結合固定されている。又、上記底板部と上記袋ナットとの結合部は、少なくともこの底板部の軸方向外側面とこの袋ナットの外周面とに、これら底板部と袋ナットとを互いに結合した状態で塗装を施す事により密封されている。
更に、上記ホルダは、上記取付孔に挿通したボルトを上記ねじ孔に螺合する事により、上記カバーに対し支持固定されている。 In particular, in the rolling bearing unit with a rotational speed detection device according to claim 1, the mounting formed on the tip of the mounting flange with the insertion portion of the holder inserted into the insertion hole in the cover. A through hole is formed in a portion where the holes are opposed to each other so that both axial sides of the cover pass through each other.
And in this through-hole portion, the outer end in the axial direction is closed on the outer surface in the axial direction of the bottom plate portion, a screw hole is opened in the center of the inner end surface in the axial direction, and a protruding portion is provided on the inner end surface in the axial direction. The cap nut is coupled and fixed by fitting the protruding portion into the through hole in a state where the screw hole and the through hole are aligned . Further, the connecting portion between the bottom plate portion and the cap nut is coated at least on the outer surface in the axial direction of the bottom plate portion and the outer peripheral surface of the cap nut with the bottom plate portion and the cap nut being connected to each other. Sealed by things.
Further, the holder is supported and fixed to the cover by screwing a bolt inserted into the mounting hole into the screw hole.

又、上述した請求項１に記載した発明を実施する場合に好ましくは、請求項２に記載した様に、突出部の外周面に凹凸を設け、この突出部を貫通孔に内嵌した状態でこの凹凸部をこの貫通孔の内周面と係合させる事により、この貫通孔の内側での上記突出部の回転を阻止する。 Further, when the invention described in claim 1 described above is carried out, preferably, as described in claim 2 , an unevenness is provided on the outer peripheral surface of the protruding portion, and the protruding portion is fitted in the through hole. By engaging the uneven portion with the inner peripheral surface of the through hole, rotation of the protruding portion inside the through hole is prevented.

これに対し、請求項３に記載した回転速度検出装置付転がり軸受ユニットに於いては、上記カバーのうち、上記ホルダの挿入部を上記挿入孔に挿入した状態で上記取付フランジの先端部に形成した取付孔が対向する部分に、上記カバーの軸方向両側面同士を通じさせる貫通孔が形成されている。On the other hand, in the rolling bearing unit with a rotational speed detection device according to claim 3, the cover is formed at the tip of the mounting flange in a state where the insertion portion of the holder is inserted into the insertion hole. A through hole is formed in a portion where the mounting holes face each other, and the axial side surfaces of the cover pass through each other.
そして、この貫通孔部分で上記底板部の軸方向外側面に、軸方向外端部が閉じられ、軸方向内端面の中央部にねじ孔が開口し、軸方向内端面に突出部が設けられた袋ナットが、このねじ孔と上記貫通孔とを整合させた状態で、この袋ナットを上記底板部に溶接する事により結合固定されている。又、上記底板部と上記袋ナットとの結合部は、少なくともこの底板部の軸方向外側面とこの袋ナットの外周面とに、これら底板部と袋ナットとを互いに結合した状態で塗装を施す事により密封されている。And in this through-hole portion, the outer end in the axial direction is closed on the outer surface in the axial direction of the bottom plate portion, a screw hole is opened in the center of the inner end surface in the axial direction, and a protruding portion is provided on the inner end surface in the axial direction The cap nut is coupled and fixed by welding the cap nut to the bottom plate portion in a state where the screw hole and the through hole are aligned. Further, the connecting portion between the bottom plate portion and the cap nut is coated at least on the outer surface in the axial direction of the bottom plate portion and the outer peripheral surface of the cap nut with the bottom plate portion and the cap nut being connected to each other. Sealed by things.
更に、上記ホルダは、上記取付孔に挿通したボルトを上記ねじ孔に螺合する事により、上記カバーに対し支持固定されている。Further, the holder is supported and fixed to the cover by screwing a bolt inserted into the mounting hole into the screw hole.

上述の様に構成する本発明の回転速度検出装置付転がり軸受ユニットの場合には、カバー内に泥水等の異物が入り込む事を防止できる構造を低コストで実現できる。
即ち、前述の特許文献１に記載された発明の様に、ナット或はボルト等の締結用部品を金属製のカバーに溶接しただけでは、このカバーの底板部とボルトの座面との間等から、泥水等の異物がカバー内に侵入するが、本発明の場合には底板部に対して袋ナットを結合部を密封した状態で結合固定している。従って、この袋ナットの設置部分を通じて、泥水等の異物がカバー内に侵入する事を防止できる。
又、特許文献２に記載された発明の様に、金属製のカバーの一部に有底の凹部を形成し、この凹部内にナット或はボルトを内嵌固定すると言った、面倒な作業が不要になり、この面からも、低コストで構成できる。
又、本発明の場合には、少なくとも上記底板部の軸方向外側面と上記袋ナットの外周面とに、互いに結合された状態で塗装を施す事により結合部を密封している為、仮に上記底板部と上記袋ナットとの間に微小な隙間が存在しても、塗装により形成された塗膜によりこの隙間が完全に塞がれて、カバー内への異物侵入防止をより確実にできる。
更に、請求項３に記載した発明の場合には、カバー内に泥水等の異物が入り込む事を防止できる構造を低コストで実現できる。 In the case of the rolling bearing unit with a rotational speed detection device of the present invention configured as described above, a structure that can prevent foreign matters such as muddy water from entering the cover can be realized at low cost.
That is, as in the invention described in the above-mentioned Patent Document 1, just by welding a fastening part such as a nut or a bolt to a metal cover, the space between the bottom plate portion of the cover and the seat surface of the bolt, etc. Thus, foreign matter such as muddy water enters the cover, but in the case of the present invention, the cap nut is coupled and fixed to the bottom plate portion with the coupling portion sealed. Therefore, foreign matter such as muddy water can be prevented from entering the cover through the installation portion of the cap nut.
Further, as in the invention described in Patent Document 2, a troublesome operation such as forming a bottomed recess in a part of a metal cover and fitting a nut or bolt into the recess is fixed. This is unnecessary and can be configured at low cost.
In the case of the present invention, at least the outer side surface in the axial direction of the bottom plate portion and the outer peripheral surface of the cap nut are coated with each other in a state of being coupled to each other. Even if there is a minute gap between the bottom plate portion and the cap nut, the gap is completely closed by the coating film formed by coating, so that foreign matter can be prevented from entering the cover more reliably.
Furthermore, in the case of the invention described in claim 3, a structure capable of preventing foreign matters such as muddy water from entering the cover can be realized at low cost.

又、上述した請求項２に記載した発明によれば、簡単な作業で、上記袋ナットを上記カバーに対し、ボルトとの緊締に伴って回転しない状態で固定する事ができ、しかも、この袋ナットを使用してセンサを保持したホルダをこのカバーに支持固定する作業も容易に行なえる。 Further, according to the invention described in claim 2 described above, the cap nut can be fixed to the cover in a state where the cap nut is not rotated by tightening with the bolt by a simple operation. The operation of supporting and fixing the holder holding the sensor to the cover using a nut can be easily performed.

本発明の実施の形態の第１例を、センサを省略した状態で示す断面図。Sectional drawing which shows the 1st example of embodiment of this invention in the state which abbreviate | omitted the sensor. 同じくカバーに支持固定する袋ナットを示す斜視図。The perspective view which similarly shows the cap nut supported and fixed to a cover. 同じくこの袋ナットをカバーに支持固定する状態を工程順に示す、図１のＡ部に相当する拡大断面図。The expanded sectional view equivalent to the A section of Drawing 1 showing the state where this cap nut is similarly supported and fixed to a cover in order of a process. 同じく上記カバーにセンサを組み付けた状態を示す、図１の右上部に相当する断面図。Sectional drawing equivalent to the upper right part of FIG. 1 which shows the state which assembled | attached the sensor to the said cover similarly. 本発明の実施の形態の第２例を示す、図４のＢ部に相当する断面図。Sectional drawing equivalent to the B section of FIG. 4 which shows the 2nd example of embodiment of this invention. 同第３例を示す、図４と同様の断面図。Sectional drawing similar to FIG. 4 showing the third example. 同第４例を示す、袋ナットの斜視図。The perspective view of a cap nut which shows the 4th example. 同じくこの袋ナットをカバーに支持固定する状態を工程順に示す、図３と同様の拡大断面図。FIG. 4 is an enlarged cross-sectional view similar to FIG. 3, showing the state in which the cap nut is supported and fixed to the cover in the order of processes. 本発明の実施の形態の第５例を示す、図４と同様の図。The figure similar to FIG. 4 which shows the 5th example of embodiment of this invention. 同第６例を、センサを保持したホルダを省略した状態で示す、図４と同様の図。The figure similar to FIG. 4 which shows the 6th example in the state which abbreviate | omitted the holder holding the sensor. 同第７例を示す、図１０と同様の図。The figure similar to FIG. 10 which shows the said 7th example. 同第８例を示す、図１０と同様の図。The figure similar to FIG. 10 which shows the same 8th example.

［実施の形態の第１例］
図１〜４は、請求項１、２に対応する、本発明の実施の形態の第１例を示している。本例の回転速度検出装置付転がり軸受ユニットの場合、使用時にも回転しない外輪１の内径側に、使用時に回転するハブ２を回転自在に支持している。そして、このハブ２の軸方向内端部に固定したエンコーダ３の回転速度を、上記外輪１に支持したセンサ４により検出自在としている。上記外輪１の内周面には、複列の外輪軌道５、５を設けている。又、上記ハブ２は、ハブ本体６と内輪７とを組み合わせて成る。即ち、このハブ本体６の軸方向内端寄り部分に形成した小径段部８に上記内輪７を外嵌し、このハブ本体６の内端部に設けた円筒部９の先端部分を径方向外方に塑性変形する事で形成したかしめ部１０により、上記内輪７の軸方向内端面を抑え付けている。この様に構成する上記ハブ２の外周面で上記各外輪軌道５、５に対向する部分には、それぞれ内輪軌道１１、１１を設けている。そして、これら各内輪軌道１１、１１と上記各外輪軌道５、５との間にそれぞれ複数個ずつの転動体１２、１２を、それぞれ保持器１３、１３により保持した状態で転動自在に設け、上記外輪１の内径側に上記ハブ２を、回転自在に支持している。 [First example of embodiment]
1 to 4 show a first example of an embodiment of the present invention corresponding to claims 1 and 2 . In the case of the rolling bearing unit with a rotational speed detection device of this example, a hub 2 that rotates during use is rotatably supported on the inner diameter side of the outer ring 1 that does not rotate during use. The rotational speed of the encoder 3 fixed to the inner end of the hub 2 in the axial direction can be detected by a sensor 4 supported on the outer ring 1. Double rows of outer ring raceways 5 and 5 are provided on the inner peripheral surface of the outer ring 1. The hub 2 is formed by combining a hub body 6 and an inner ring 7. That is, the inner ring 7 is externally fitted to a small-diameter step portion 8 formed near the inner end of the hub body 6 in the axial direction, and the tip end portion of the cylindrical portion 9 provided at the inner end of the hub body 6 is radially outer. The inner end surface in the axial direction of the inner ring 7 is suppressed by a caulking portion 10 formed by plastic deformation in the direction. Inner ring raceways 11 and 11 are provided on portions of the outer peripheral surface of the hub 2 configured as described above, which are opposed to the outer ring raceways 5 and 5, respectively. A plurality of rolling elements 12 and 12 are provided between the inner ring raceways 11 and 11 and the outer ring raceways 5 and 5, respectively, so as to be freely rollable while being held by the cages 13 and 13, respectively. The hub 2 is rotatably supported on the inner diameter side of the outer ring 1.

又、上記ハブ２の軸方向外端部外周面で上記外輪１の外端部から軸方向外方に突出した部分に、車輪を取り付ける為の回転側フランジ１４を設けている。又、上記外輪１の軸方向中間部外周面に、この外輪１を懸架装置に取り付ける為の静止側フランジ１５を設けている。又、上記外輪１の外端開口部と上記ハブ２の中間部外周面との間の隙間を、シールリング１６により塞いで、上記各転動体１２、１２を設置した空間１７の両端開口のうち、軸方向外端側の開口を塞いでいる。尚、重量の嵩む自動車用の転がり軸受ユニットの場合には、上記複数個の転動体１２、１２として、図示の様な玉に代えて、テーパころを使用する場合もある。   Further, a rotation side flange 14 for attaching a wheel is provided at a portion of the outer peripheral surface of the outer end portion of the hub 2 that protrudes outward in the axial direction from the outer end portion of the outer ring 1. A stationary flange 15 for attaching the outer ring 1 to a suspension device is provided on the outer peripheral surface of the axially intermediate portion of the outer ring 1. Further, a gap between the outer end opening of the outer ring 1 and the outer peripheral surface of the intermediate part of the hub 2 is closed by a seal ring 16, and the two ends of the space 17 in which the rolling elements 12 and 12 are installed. The opening on the axially outer end side is closed. In the case of a rolling bearing unit for automobiles that is heavy, tapered rollers may be used as the plurality of rolling elements 12 and 12 instead of balls as shown in the figure.

上述の様な転がり軸受ユニットに回転速度検出装置を組み込むべく、上記内輪７の軸方向内端部で上記内輪軌道１１から外れた部分の外周面に、前記エンコーダ３を外嵌固定している。このエンコーダ３は、それぞれが円環状に造られた、芯金１８と永久磁石１９とから成る。このうちの芯金１８は、軟鋼板等の磁性金属板に塑性加工を施す事により、断面略Ｔ字形としたもので、円筒部２０と円輪部２１とを備える。そして、このうちの円筒部２０を上記内輪７の軸方向内端部に締まり嵌めで外嵌する事により、この内輪７の内端部に固定している。又、上記永久磁石１９は、上記円輪部２１の軸方向内側面に添着している。この永久磁石１９は、軸方向に亙って着磁されており、着磁方向は、円周方向に関して交互に、且つ、等間隔で変化させている。従って、被検出面である、上記永久磁石１９の軸方向内側面には、Ｓ極とＮ極とが、交互に、且つ、等間隔で配置されている。   In order to incorporate the rotational speed detection device into the rolling bearing unit as described above, the encoder 3 is fitted and fixed to the outer peripheral surface of the inner ring 7 at the inner end portion of the inner ring 7 that is separated from the inner ring raceway 11. The encoder 3 includes a cored bar 18 and a permanent magnet 19 each formed in an annular shape. Of these, the core 18 is formed into a substantially T-shaped cross section by performing plastic working on a magnetic metal plate such as a mild steel plate, and includes a cylindrical portion 20 and an annular portion 21. Of these, the cylindrical portion 20 is fixed to the inner end portion of the inner ring 7 by fitting the cylindrical portion 20 to the inner end portion in the axial direction of the inner ring 7 with an interference fit. The permanent magnet 19 is attached to the inner side surface in the axial direction of the ring portion 21. The permanent magnet 19 is magnetized in the axial direction, and the magnetization direction is changed alternately and at equal intervals in the circumferential direction. Therefore, the south poles and the north poles are alternately arranged at equal intervals on the inner surface in the axial direction of the permanent magnet 19, which is the detected surface.

又、上記外輪１の内端開口部にカバー２２を、上記エンコーダ３を構成する永久磁石１９の軸方向内側面に対向する状態で嵌合固定している。上記カバー２２は、ＳＰＣＣの如き軟鋼板、或はアルミニウム合金板等の金属板（本例の場合には磁性材であるＳＰＣＣ材）に絞り加工等の塑性加工を施して成り、円筒部２３の軸方向内端部を底板部２４で塞いだ有底円筒状である。本例の場合、上記カバー２２を磁性材製とする事により、上記エンコーダ３及び前記センサ４を外部磁界から遮蔽し、これら両部材３、４による回転速度検出を、ノイズによる影響を受けず正確に行なえる様にしている。   Further, a cover 22 is fitted and fixed to the inner end opening of the outer ring 1 so as to face the inner surface in the axial direction of the permanent magnet 19 constituting the encoder 3. The cover 22 is formed by subjecting a soft steel plate such as SPCC or a metal plate such as an aluminum alloy plate (SPCC material which is a magnetic material in this example) to plastic processing such as drawing. It is a bottomed cylindrical shape whose inner end in the axial direction is closed with a bottom plate portion 24. In the case of this example, the cover 22 is made of a magnetic material, so that the encoder 3 and the sensor 4 are shielded from an external magnetic field, and the rotational speed detection by both the members 3 and 4 can be accurately performed without being affected by noise. So that you can go to.

又、上記円筒部２３の軸方向中間部に、上記金属板の一部を径方向外方に座屈変形させると共に軸方向に重ね合わせた、外向フランジ状の鍔部２５を形成している。この様なカバー２２は、この鍔部２５よりも軸方向外寄り部分である上記円筒部２３の先端部を上記外輪１の軸方向内端部に締り嵌めで内嵌する事により、この外輪１の軸方向内端部に固定している。この状態で、上記鍔部２５の軸方向外側面を、上記外輪１の軸方向内端面に突き当てて、上記カバー２２の軸方向に関する位置決めを図っている。尚、上記円筒部２３の先端部の内径は、上記芯金１８を構成する円輪部２１の外径よりも少しだけ大きくしている。従って、この円輪部２１の外周縁は上記円筒部２３の先端部の内周面に近接対向して、当該部分にラビリンスシールを構成し、前記各転動体１２、１２を設置した、前記空間１７に存在するグリースが、上記円輪部２１を越えて上記カバー２２内に入り込む事を防止する。   In addition, an outward flange-like flange portion 25 is formed in the middle portion of the cylindrical portion 23 in the axial direction, in which a part of the metal plate is buckled and deformed radially outward and overlapped in the axial direction. Such a cover 22 is fitted to the inner end of the outer ring 1 by an interference fit at the tip end of the cylindrical portion 23 which is a portion closer to the outer side in the axial direction than the flange 25, so that the outer ring 1 It is fixed to the inner end in the axial direction. In this state, the axially outer side surface of the flange portion 25 is abutted against the axially inner end surface of the outer ring 1 to position the cover 22 in the axial direction. Note that the inner diameter of the tip portion of the cylindrical portion 23 is slightly larger than the outer diameter of the annular portion 21 constituting the cored bar 18. Therefore, the outer peripheral edge of the circular ring portion 21 is close to and opposed to the inner peripheral surface of the distal end portion of the cylindrical portion 23, constitutes a labyrinth seal in the portion, and the rolling elements 12, 12 are installed in the space. 17 is prevented from entering the cover 22 beyond the circular ring portion 21.

又、上記底板部２４の上部に、挿入孔２６と貫通孔２７とを設けている。このうちの挿入孔２６は、前記エンコーダ３の回転速度を検出する為のセンサ４を保持したホルダ２８の挿入部２９を挿入する為のもので、上記底板部２４の外径寄り部分（上端部分）で上記エンコーダ３と対向する部分に形成している。本例の場合、上記挿入孔２６をバーリング加工により形成して、この挿入孔２６の周縁部に小円筒部３０を形成している。本例の場合、この小円筒部３０の一部外周面と、上記円筒部２３の一部内周面とを当接させている。即ち、上記挿入孔２６を、できる限り外径寄り部分に位置させている。これに対して、上記貫通孔２７は、上記底板部２４のうちで上記挿入孔２６よりも中心寄り部分に、プレスによる打ち抜き等により形成している。   An insertion hole 26 and a through hole 27 are provided in the upper part of the bottom plate portion 24. The insertion hole 26 is for inserting the insertion portion 29 of the holder 28 that holds the sensor 4 for detecting the rotational speed of the encoder 3, and is a portion closer to the outer diameter (upper end portion) of the bottom plate portion 24. ) At a portion facing the encoder 3. In the case of this example, the insertion hole 26 is formed by burring, and the small cylindrical portion 30 is formed at the peripheral edge of the insertion hole 26. In the case of this example, a partial outer peripheral surface of the small cylindrical portion 30 and a partial inner peripheral surface of the cylindrical portion 23 are brought into contact with each other. That is, the insertion hole 26 is positioned as close to the outer diameter as possible. On the other hand, the through hole 27 is formed in the bottom plate portion 24 at a portion closer to the center than the insertion hole 26 by stamping or the like by a press.

尚、上記挿入孔２６を単なる打ち抜き孔とせず、小円筒部３０を設けたバーリング孔とする理由は、上記ホルダ２８の挿入部２９の外周面に係止したＯリング３８の外周縁を確実に当接させ、この挿入部２９の挿通部分の間のシールを図り易くする為である。又、上記バーリング孔とする理由には、打ち抜き孔のエッジで上記ホルダ２８の表面を損傷する事を防止する事、並びに、上記挿入部２９の外周面と上記小円筒部３０の内周面とが当接する部分の軸方向寸法を大きくして、この挿入部２９の先端部に保持された上記センサ４の径方向に関する位置決めを安定させる事が含まれる。尚、上記挿入孔２６をバーリング加工により形成する場合には、上記小円筒部３０の軸方向長さを、必ずしも十分に確保できず、この軸方向長さが短くなる可能性がある。この様な場合で、各部の寸法許容差によっては、上記Ｏリング３８が上記小円筒部３０の内周面から外れる可能性がある場合には、上記小円筒部３０を、バーリング加工ではなく、深絞り加工により形成し、この小円筒部３０の軸方向長さを確保する事もできる。   The reason why the insertion hole 26 is not a mere punching hole but is a burring hole provided with a small cylindrical portion 30 is that the outer peripheral edge of the O-ring 38 locked to the outer peripheral surface of the insertion portion 29 of the holder 28 is surely formed. This is to make it easier to achieve a seal between the insertion portions of the insertion portion 29. The reason for the burring hole is to prevent the surface of the holder 28 from being damaged by the edge of the punching hole, and the outer peripheral surface of the insertion portion 29 and the inner peripheral surface of the small cylindrical portion 30. This includes enlarging the axial dimension of the portion in contact with each other to stabilize the positioning of the sensor 4 held at the distal end of the insertion portion 29 in the radial direction. When the insertion hole 26 is formed by burring, the axial length of the small cylindrical portion 30 cannot always be sufficiently secured, and this axial length may be shortened. In such a case, if there is a possibility that the O-ring 38 may come off from the inner peripheral surface of the small cylindrical part 30 depending on the dimensional tolerance of each part, the small cylindrical part 30 is not burring processed. It can be formed by deep drawing, and the axial length of the small cylindrical portion 30 can be secured.

又、上記底板部２４の軸方向外側面のうちで上記貫通孔２７の周囲部分に、袋ナット３１を固定している。本例の場合、この袋ナット３１の軸方向内端面に、円環状の突出部３２を、全周に亙り連続して突出形成している。この突出部３２の先半部（軸方向内半部）３３の外径は、基半部（軸方向外半部）３４の外径よりも大きくしており、この先半部３３の外周面は、先端縁に向かうに従って小さくなる方向に傾斜した、先細テーパ面としている。又、上記先半部３３の外周面には、ローレット加工により、微小な凹凸を形成している。この様な先半部３３の先端縁の自由状態での外径ｄ33は、上記貫通孔２７の自由状態での内径Ｒ27よりも小さく、同じく基端縁の自由状態での外径Ｄ33は、この内径Ｒ27よりも大きい（ｄ33＜Ｒ27＜Ｄ33）。この様な突出部３２を備えた、上記袋ナット３１は、図３（Ａ）に示す様に、この突出部３２を上記貫通孔２７の軸方向外端側開口に対向させた状態から、上記底板部２４の軸方向外側面に、プレス加工機等により強く押し付ける。 Further, a cap nut 31 is fixed to the peripheral portion of the through hole 27 in the outer surface in the axial direction of the bottom plate portion 24. In the case of this example, an annular projecting portion 32 is formed on the inner end surface in the axial direction of the cap nut 31 so as to continuously project over the entire circumference. The outer diameter of the tip half (axially inner half) 33 of the protrusion 32 is larger than the outer diameter of the base half (axially outer half) 34, and the outer peripheral surface of the tip half 33 is The taper surface is a tapered surface inclined in a direction of decreasing toward the tip edge. In addition, minute irregularities are formed on the outer peripheral surface of the tip half 33 by knurling. The outer diameter d 33 in the free state of the leading edge of such a leading half 33 is smaller than the inner diameter R 27 in the free state of the through-hole 27 and is similarly the outer diameter D 33 in the free state of the base edge. Is larger than the inner diameter R 27 (d 33 <R 27 <D 33 ). As shown in FIG. 3 (A), the cap nut 31 provided with such a protrusion 32 is formed from the state in which the protrusion 32 is opposed to the axially outer end opening of the through hole 27. The bottom plate portion 24 is strongly pressed against the outer surface in the axial direction by a press machine or the like.

この押し付け作業の結果、上記突出部３２が、上記底板部２４の一部で上記貫通孔２７の内周面部分を塑性変形させながらこの貫通孔２７内に、図３（Ｂ）に示す様に、この底板部２４の軸方向外側面と上記袋ナット３１の本体部分の軸方向内端面とが当接するまで押し込まれる。この作業により、上記突出部３２の先半部３３が上記貫通孔２７の内周面部分に食い込み、上記袋ナット３１が前記カバー２２の底板部２４の軸方向外側面で上記貫通孔２７を囲む部分に支持固定される。本例の場合、上記突出部３２の表面硬度はＨｖ５５０程度であり、ＳＰＣＣ材製で硬度がＨｖ１００〜１３０程度である上記カバー２２よりも十分に硬い。従って、このカバー２２の一部が塑性変形して、上記突出部３２が上記貫通孔２７の内周面部分に食い込む事は十分に可能である。又、本例の場合、上記底板部２４の厚さは、０．８〜１．２mm程度であるが、この程度の厚さであっても、上記突出部３２の軸方向寸法を適切に規制する事で、この突出部３２を上記底板部２４の軸方向内側面から出っ張らせる事なく、この底板部２４に上記袋ナット３１を固定できる。   As a result of the pressing operation, the protrusion 32 is formed in the through hole 27 while plastically deforming the inner peripheral surface portion of the through hole 27 at a part of the bottom plate portion 24 as shown in FIG. The bottom plate portion 24 is pushed in until the axially outer side surface and the axially inner end surface of the main body portion of the cap nut 31 come into contact with each other. By this operation, the front half 33 of the protrusion 32 bites into the inner peripheral surface portion of the through hole 27, and the cap nut 31 surrounds the through hole 27 on the outer surface in the axial direction of the bottom plate portion 24 of the cover 22. Supported and fixed to the part. In the case of this example, the protrusion 32 has a surface hardness of about Hv550 and is sufficiently harder than the cover 22 made of SPCC material and having a hardness of about Hv100 to 130. Therefore, it is sufficiently possible that a part of the cover 22 is plastically deformed and the protruding portion 32 bites into the inner peripheral surface portion of the through hole 27. In the case of this example, the thickness of the bottom plate portion 24 is about 0.8 to 1.2 mm, but the axial dimension of the protruding portion 32 is appropriately regulated even with this thickness. By doing so, the cap nut 31 can be fixed to the bottom plate portion 24 without protruding the protruding portion 32 from the inner surface in the axial direction of the bottom plate portion 24.

この様にして互いに結合固定した、この底板部２４の軸方向外側面（図１、３、４の左側面）と、上記袋ナット３１の外周面とには、これら底板部２４と袋ナット３１とを結合固定した後に、塗装を施している。塗装の種類は特に問わないが、耐水性塗料が好ましい。例えば、上記底板部２４に上記袋ナット３１を結合固定した状態で、カチオン塗装等の防錆処理を、上記カバー２２の表裏両面（底板部２４に関しては軸方向内外両側面）に施す事が考えられる。この様にして、上記底板部２４の軸方向外側面と袋ナット３１の外周面とを塗装する事により、互いに結合されたこれら底板部２４と袋ナット３１との間に存在する微小隙間を、全周に亙って完全に塞ぎ、上記貫通孔２７内に入り込んだ泥水等の異物が、上記カバー２２の内側に入り込む事を確実に防止できる様にしている。   The bottom plate portion 24 and the cap nut 31 are connected to the axially outer side surface (the left side surface in FIGS. 1, 3, and 4) of the bottom plate portion 24 and the outer peripheral surface of the cap nut 31, which are coupled and fixed in this manner. After being bonded and fixed, it is painted. The type of coating is not particularly limited, but a water resistant paint is preferable. For example, it is conceivable that rust prevention treatment such as cation coating is applied to both the front and back surfaces of the cover 22 (both axially inner and outer surfaces with respect to the bottom plate portion 24) in a state where the cap nut 31 is coupled and fixed to the bottom plate portion 24. It is done. In this way, by coating the outer surface of the bottom plate portion 24 in the axial direction and the outer peripheral surface of the cap nut 31, a minute gap existing between the bottom plate portion 24 and the cap nut 31 coupled to each other is obtained. It is possible to reliably prevent foreign matter such as muddy water entering the through hole 27 from entering the inside of the cover 22 by completely closing the entire circumference.

上記微小隙間の開口面積は僅少である為、この微小隙間を塞ぐ為には、特に塗膜の厚さを大きくする必要はないが、塗膜の強度を確保できる限り、大きくする事は自由である。塗膜の厚さが大きくなる様な場合には、上記袋ナット３１の内周面に形成したねじ孔部分は、必要に応じて塗料が入り込まない様に、マスキングにより覆う。塗膜の厚さが、このねじ孔と後述するボルト３７との螺合の妨げとならない程度であれば、この様な配慮は不要である。例えば、上記カチオン塗装の膜厚は１５〜２５μｍ程度と薄く、カチオン塗装を施す事での寸法変化は僅かである。従って、このカチオン塗装処理は、雌ねじを設けた上記袋ナット３１の内周面と、前記挿入孔２６と、前記貫通孔２７とに、マスキングを施す事なく行なえる。尚、上記底板部２４の軸方向外側面と上記袋ナット３１の外周面とにのみ、接着剤又はコーキング剤を塗布する事も、請求項１、３に記載した塗装の概念に含まれる。 Since the opening area of the above-mentioned minute gap is very small, it is not necessary to increase the thickness of the coating film in order to close this minute gap, but it is free to increase it as long as the strength of the coating film can be secured. is there. When the thickness of the coating film increases, the screw hole portion formed on the inner peripheral surface of the cap nut 31 is covered by masking so that the paint does not enter as necessary. Such consideration is unnecessary if the thickness of the coating film is such that the screw hole does not hinder the screw 37 to be described later. For example, the film thickness of the cationic coating is as thin as about 15 to 25 μm, and the dimensional change due to the cationic coating is slight. Therefore, this cationic coating treatment can be performed without masking the inner peripheral surface of the cap nut 31 provided with the female screw, the insertion hole 26 and the through hole 27. In addition, it is also included in the concept of the coating described in claims 1 and 3 to apply an adhesive or a caulking agent only to the axially outer side surface of the bottom plate portion 24 and the outer peripheral surface of the cap nut 31.

そして、上記カバー２２の外径寄り部分にホルダ２８を、上記挿入孔２６と上記貫通孔２７並びに上記袋ナット３１とを利用して、支持固定している。上記ホルダ２８は、合成樹脂を射出成形して成るもので、挿入部２９と取付フランジ部３５とを備える。このうちの挿入部２９は、前記挿入孔２６の周縁部に形成した小円筒部３０内にがたつきなく挿入自在な、略円柱状である。この様な挿入部２９の先端部には、前記永久磁石１９の被検出面に対向し、この被検出面の特性変化に対応して出力を変化させる前記センサ４（センサ本体）を保持（包埋支持）している。又、上記取付フランジ部３５は、上記挿入部２９の軸方向内端部にその基端部を結合したもので、その先端部には取付孔３６を形成している。この取付孔３６の中心と上記挿入部２９の中心とのピッチは、上記挿入孔２６の中心と上記貫通孔２７の中心とのピッチに等しくしている。   A holder 28 is supported and fixed on the outer diameter portion of the cover 22 by using the insertion hole 26, the through hole 27 and the cap nut 31. The holder 28 is formed by injection molding synthetic resin, and includes an insertion portion 29 and a mounting flange portion 35. Of these, the insertion portion 29 has a substantially columnar shape that can be freely inserted into the small cylindrical portion 30 formed at the peripheral edge of the insertion hole 26 without rattling. The tip of the insertion portion 29 holds the sensor 4 (sensor body) that faces the detection surface of the permanent magnet 19 and changes the output in response to a change in the characteristics of the detection surface. (Buried support). The mounting flange portion 35 has a base end portion coupled to an axially inner end portion of the insertion portion 29, and a mounting hole 36 is formed at the distal end portion thereof. The pitch between the center of the mounting hole 36 and the center of the insertion portion 29 is equal to the pitch between the center of the insertion hole 26 and the center of the through hole 27.

この様なホルダ２８を上記カバー２２に支持固定する際には、上記挿入部２９を上記挿入孔２６に挿入すると共に、上記取付孔３６を上記貫通孔２７に整合させる。そして、この取付孔３６及びこの貫通孔２７を、軸方向内側から外側に向けて挿通したボルト３７を、上記袋ナット３１に螺合し更に緊締する。この状態で上記ホルダ２８が上記カバー２２に支持固定され、上記挿入部２９の先端部に保持された上記センサ４が、上記永久磁石１９の被検出面に、適正隙間を介して近接対向する。又、この状態で、上記挿入部２９の基端寄り（軸方向内端寄り、図１、４の右端寄り）部分に形成した係止溝４０に係止したＯリング３８が、この係止溝４０の底面と前記小円筒部３０の内周面との間で、径方向に関して弾性的に圧縮される。従って、この小円筒部３０の内周面と上記挿入部２９の外周面との間のシールが有効に図られる。尚、本例の場合には、上記ボルト３７として、Ｍ６で強度区分が１２．９のものを使用している。この場合に於ける、このボルト３７の適正締付けトルクは、約１３Ｎ・ｍとなる。   When such a holder 28 is supported and fixed to the cover 22, the insertion portion 29 is inserted into the insertion hole 26 and the mounting hole 36 is aligned with the through hole 27. Then, a bolt 37 inserted through the attachment hole 36 and the through hole 27 from the inner side to the outer side in the axial direction is screwed into the cap nut 31 and further tightened. In this state, the holder 28 is supported and fixed to the cover 22, and the sensor 4 held at the distal end portion of the insertion portion 29 comes close to and faces the detection surface of the permanent magnet 19 through an appropriate gap. Further, in this state, the O-ring 38 locked to the locking groove 40 formed near the proximal end of the insertion portion 29 (closer to the inner end in the axial direction, closer to the right end in FIGS. 1 and 4) has the locking groove. Between the bottom surface of 40 and the inner peripheral surface of the small cylindrical portion 30, it is elastically compressed in the radial direction. Therefore, the seal between the inner peripheral surface of the small cylindrical portion 30 and the outer peripheral surface of the insertion portion 29 is effectively achieved. In the case of this example, as the bolt 37, a bolt having M6 and a strength classification of 12.9 is used. In this case, the proper tightening torque of the bolt 37 is about 13 N · m.

上述の様な本例の回転速度検出装置付転がり軸受ユニットの使用時には、前記外輪１の外周面に固設した前記静止側フランジ１５を懸架装置に対して、図示しないボルトにより結合固定すると共に、前記ハブ２の外周面に固設した回転側フランジ１４に車輪を、この回転側フランジ１４に設けた複数本のスタッド３９により固定する事で、上記懸架装置に対して上記車輪を回転自在に支持する。この状態で車輪が回転すると、上記挿入部２９の先端部に保持された上記センサ４の近傍を、上記永久磁石１９の被検出面に存在するＳ極とＮ極とが交互に通過する。この結果、上記センサ４を構成する、ホールＩＣ、磁気抵抗素子等の磁気検出素子の特性が変化し、このセンサ４の出力が変化する。この様にしてこのセンサ４の出力が変化する周波数は、上記車輪の回転数に比例する。従って、このセンサ４の出力を図示しない制御器に送れば、ＡＢＳやＴＣＳ、ＶＳＣ等の車両用走行状態安定化装置を適切に制御できる。   When using the rolling bearing unit with the rotational speed detection device of the present example as described above, the stationary flange 15 fixed to the outer peripheral surface of the outer ring 1 is coupled and fixed to a suspension device with a bolt (not shown), By fixing the wheel to the rotation side flange 14 fixed to the outer peripheral surface of the hub 2 by a plurality of studs 39 provided on the rotation side flange 14, the wheel is supported rotatably with respect to the suspension device. To do. When the wheel rotates in this state, the S pole and the N pole existing on the detection surface of the permanent magnet 19 alternately pass through the vicinity of the sensor 4 held at the distal end of the insertion portion 29. As a result, the characteristics of the magnetic detection elements such as the Hall IC and the magnetoresistive element constituting the sensor 4 change, and the output of the sensor 4 changes. The frequency at which the output of the sensor 4 changes in this way is proportional to the rotational speed of the wheel. Accordingly, if the output of the sensor 4 is sent to a controller (not shown), the vehicle running state stabilization device such as ABS, TCS, VSC, etc. can be appropriately controlled.

尚、本例の場合、前述の様に、前記小円筒部３０の一部外周面と、前記円筒部２３の一部内周面とを当接させて、前記挿入孔２６を、できる限り外径寄り部分に位置させている。この為、上記永久磁石１９の被検出面のうちで上記センサ４が対向する部分の直径を大きくできる。この部分の直径を大きくする事により、磁極が変化する回数を同じとした場合には、着磁領域の幅寸法（着磁面積）の増大による、磁気強化により、上記センサ４の検出性能の向上を図れる。又、上記幅寸法を同じとした場合には、磁極が変化する回数を多くして、回転速度検出に関する精度向上に寄与できる。この様に、上記小円筒部３０をできる限り外径寄り部分に設置する為に、この小円筒部３０を形成する為のバーリング加工時に加工用のダイスは、この小円筒部３０のうちで外径寄り部分（図１、４の上部）をサポートせず、この小円筒部３０の全周のうちでこの外径寄り部分を除いた部分をサポートする。   In the case of this example, as described above, a part of the outer peripheral surface of the small cylindrical part 30 and a part of the inner peripheral surface of the cylindrical part 23 are brought into contact with each other so that the insertion hole 26 has an outer diameter as much as possible. It is located on the side. For this reason, the diameter of the part which the said sensor 4 opposes among the to-be-detected surfaces of the said permanent magnet 19 can be enlarged. If the number of times the magnetic pole changes is the same by increasing the diameter of this portion, the detection performance of the sensor 4 is improved by magnetic strengthening by increasing the width dimension (magnetization area) of the magnetized region. Can be planned. Further, when the width dimensions are the same, the number of times the magnetic pole changes can be increased, which can contribute to improvement in accuracy related to rotation speed detection. In this way, in order to place the small cylindrical portion 30 as close to the outer diameter as possible, a processing die for burring for forming the small cylindrical portion 30 is an outer portion of the small cylindrical portion 30. A portion near the diameter (upper part in FIGS. 1 and 4) is not supported, and a portion of the entire circumference of the small cylindrical portion 30 excluding the portion near the outer diameter is supported.

上述の様に構成し作用する本例の回転速度検出装置付転がり軸受ユニットの場合には、前記カバー２２内に泥水等の異物が入り込む事を防止できる構造を低コストで実現できる。即ち、前述の特許文献１に記載された発明の様に、ナット或はボルト等の締結用部品を金属製のカバーに溶接しただけでは、このカバーの底板部とボルトの座面との間等から、泥水等の異物がカバー内に侵入するが、本例の場合には、前記底板部２４に対して前記袋ナット３１を結合固定すると共に、この結合部を密封している。従って、この袋ナット３１の設置部分を通じて、泥水等の異物が上記カバー２２内に侵入する事を防止できる。又、やはり前述した特許文献２に記載された発明の様に、金属製のカバーの一部に有底の凹部を形成し、この凹部内にナット或はボルトを内嵌固定すると言った、面倒な作業が不要になり、この面からも、低コストで構成できる。   In the case of the rolling bearing unit with the rotational speed detection device of the present example configured and acting as described above, a structure capable of preventing foreign matter such as muddy water from entering the cover 22 can be realized at low cost. That is, as in the invention described in the above-mentioned Patent Document 1, just by welding a fastening part such as a nut or a bolt to a metal cover, the space between the bottom plate portion of the cover and the seat surface of the bolt, etc. Therefore, foreign matter such as muddy water enters the cover. In the case of this example, the cap nut 31 is coupled and fixed to the bottom plate portion 24 and the coupling portion is sealed. Therefore, foreign matter such as muddy water can be prevented from entering the cover 22 through the installation portion of the cap nut 31. Also, as in the invention described in Patent Document 2 mentioned above, a bottomed recess is formed in a part of a metal cover, and a nut or bolt is fitted and fixed in this recess. From this aspect, it can be configured at low cost.

尚、回転速度検出装置付転がり軸受ユニットの軸方向内端側から、上記カバー２２内に異物が入り込む可能性のある部分は、次の(a) 〜(c) に示した３個所位置である。
(a) 上記カバー２２を構成する円筒部２３の先端部（軸方向外端部）と前記外輪１の軸方向内端部との嵌合部。
(b) 前記挿入部２９が前記小円筒部３０を挿通した部分。
(c) 上記袋ナット３１と上記底板部２４との結合部。 The parts where foreign matter may enter the cover 22 from the axially inner end side of the rolling bearing unit with rotational speed detecting device are the three positions shown in the following (a) to (c). .
(a) A fitting portion between the distal end portion (axially outer end portion) of the cylindrical portion 23 constituting the cover 22 and the axially inner end portion of the outer ring 1.
(b) A portion where the insertion portion 29 is inserted through the small cylindrical portion 30.
(c) A connecting portion between the cap nut 31 and the bottom plate portion 24.

このうちの(a) 部分は、円筒部２３の先端部を上記外輪１の軸方向内端部に大きな締り嵌めで内嵌しており、且つ、前記鍔部２５の軸方向外側面を上記外輪１の軸方向内端面に突き当てている。従って、上記(a) 部分には、上記異物が通過する様な隙間が殆ど存在せず、仮に存在しても、上記鍔部２５に覆われている為、この隙間部分に異物が勢い良く吹き付けられる事はない。この為、上記(a) 部分から上記カバー２２内に異物が入り込む事はない。
又、上記(b) 部分は、前述した様にＯリング３８により塞いでいる。この為、この(b) 部分から上記カバー２２内に異物が入り込む事はない。
更に、上記(c) 部分は、前記突出部３２を前記底板部２４に形成した貫通孔２７に、この底板部２４を塑性変形させつつ圧入している。従って、上記袋ナット３１と上記底板部２４との結合部には、これら袋ナット３１と底板部２４とを結合した直後の状態でも、微小隙間しか存在しない。しかも本例の場合には、この微小隙間も塗装による塗膜で塞いでいる為、上記(c) 部分から上記カバー２２内に異物が入り込む事はない。
この結果、このカバー２２内に上記異物が入り込む事を、ほぼ確実に防止できる。 Of these, the portion (a) has the tip end of the cylindrical portion 23 fitted into the inner end portion of the outer ring 1 in the axial direction with a large interference fit, and the outer side surface of the flange portion 25 in the axial direction is the outer ring portion. 1 is abutted against the axially inner end face. Therefore, there is almost no gap through which the foreign substance passes in the part (a), and even if it exists, the foreign part is sprayed vigorously into the gap part because it is covered with the flange 25. There is nothing to be done. For this reason, foreign matter does not enter the cover 22 from the portion (a).
The part (b) is closed by the O-ring 38 as described above. For this reason, foreign matter does not enter the cover 22 from the portion (b).
Further, the portion (c) is press-fitted into the through hole 27 in which the protruding portion 32 is formed in the bottom plate portion 24 while the bottom plate portion 24 is plastically deformed. Therefore, there is only a minute gap at the joint between the cap nut 31 and the bottom plate portion 24 even immediately after the cap nut 31 and the bottom plate portion 24 are joined. In addition, in the case of this example, since this minute gap is also covered with the coating film by painting, foreign matter does not enter the cover 22 from the portion (c).
As a result, it is possible to almost certainly prevent the foreign matter from entering the cover 22.

又、本例は、上記カバー２２の変形を防止して回転速度検出を正確に行なえる構造を実現する面からも有利である。即ち、上記袋ナット３１を上記底板部２４に固定する作業は、この底板部２４を受板等の平面上に置いた状態で、上記袋ナット３１をこの底板部２４に押し付ける事で行なう為、この底板部２４に有害な歪みが生じる事はない。従って、特に面倒な調節作業を行なわなくても、前記エンコーダ３を構成する上記永久磁石１９の被検出面と、上記センサ４の検出部との位置関係を、設計通り正確に規制する事ができて、コストを嵩ませる事なく、回転輪であるハブ２の回転速度検出を正確に行なえる。   This example is also advantageous in terms of realizing a structure that can accurately detect the rotational speed by preventing the cover 22 from being deformed. That is, the operation of fixing the cap nut 31 to the bottom plate portion 24 is performed by pressing the cap nut 31 against the bottom plate portion 24 with the bottom plate portion 24 placed on a flat surface such as a receiving plate. No harmful distortion occurs in the bottom plate portion 24. Accordingly, the positional relationship between the detection surface of the permanent magnet 19 constituting the encoder 3 and the detection portion of the sensor 4 can be accurately regulated as designed without any particularly troublesome adjustment work. Thus, the rotational speed of the hub 2 that is a rotating wheel can be accurately detected without increasing the cost.

［実施の形態の第２例］
図５は、本発明の実施の形態の第２例を示している。本例の場合には、エンコーダ３ａを構成する芯金１８ａの軸方向外端部を径方向外方に折り曲げ形成して成る円輪部４１の外周縁を、外輪１の軸方向内端部内周面、又は、カバー２２を構成する円筒部２３の先端部内周面に近接対向させて、当該部分にラビリンスシールを構成している。その他の部分の構成及び作用は、上述した実施の形態の第１例と同様であるから、同等部分に関する図示並びに説明は省略する。 [Second Example of Embodiment]
FIG. 5 shows a second example of the embodiment of the present invention. In the case of this example, the outer peripheral edge of the annular portion 41 formed by bending the outer end in the axial direction of the cored bar 18a constituting the encoder 3a radially outward is used as the inner periphery of the inner end in the axial direction of the outer ring 1. A labyrinth seal is formed on the surface or the inner peripheral surface of the tip of the cylindrical portion 23 constituting the cover 22 in close proximity to each other. Since the configuration and operation of the other parts are the same as in the first example of the above-described embodiment, illustration and description regarding the equivalent parts are omitted.

［実施の形態の第３例］
図６は、請求項１、２に対応する、本発明の実施の形態の第３例を示している。本例の場合には、エンコーダ３ｂを構成する芯金１８ｂを、断面Ｌ字形としている。即ち、この芯金１８ｂは、円筒部２０の軸方向内端部を径方向外方に向け直角に折り曲げて成る円輪部２１ａを備え、この円輪部２１ａの軸方向内側面に、円輪状の永久磁石１９を、全周に亙って添設している。その他の部分の構造及び作用は、上述した実施の形態の第１例と同様であるから、同等部分に関する図示並びに説明は省略する。 [Third example of embodiment]
FIG. 6 shows a third example of an embodiment of the present invention corresponding to claims 1 and 2 . In the case of this example, the cored bar 18b constituting the encoder 3b has an L-shaped cross section. That is, the metal core 18b includes an annular portion 21a formed by bending an axially inner end portion of the cylindrical portion 20 toward a radially outward direction at a right angle, and an annular shape is formed on the axially inner side surface of the annular portion 21a. The permanent magnet 19 is attached along the entire circumference. Since the structure and operation of the other parts are the same as those of the first example of the above-described embodiment, illustration and description regarding the equivalent parts are omitted.

［実施の形態の第４例］
図７〜８は、請求項１に対応する、本発明の実施の形態の第４例を示している。本例の場合には、袋ナット３１ａの軸方向内端面に突出形成された突出部３２ａの外周面形状を、先端縁（軸方向内端縁）に向かう程外径が大きくなる方向に傾斜したテーパ面としている。この様な突出部３２ａの自由状態での外径ｄ32a は、貫通孔２７の自由状態での内径Ｒ27と同じか、この内径Ｒ27よりも僅かに小さい（ｄ32a ≦Ｒ27）。この様な突出部３２ａを設けた上記袋ナット３１ａをカバー２２の底板部２４の軸方向外側面に固定する際には、先ず、図８（Ａ）に示す様に、上記突出部３２ａを上記貫通孔２７内に挿入する。次いで、上記袋ナット３１ａを上記底板部２４に向け、プレス加工機等により強く押し付ける。この押し付け作業により、図８（Ｂ）に示す様に、非円形の一種の多角形である正六角形とされた上記袋ナット３１ａの本体部分の軸方向内端部が、上記底板部２４のうちで上記貫通孔２７の周囲部分に沈入する。同時に、この貫通孔２７の周縁部の肉が径方向内側に変位し、上記突出部３２ａの基端部に食い込む。この結果、上記袋ナット３１ａが上記底板部２４に対し、ボルト３７（図４参照）の緊締の際にも（上記正六角形部分が上記底板部２４に食い込んでいる為に）回転する事を防止された状態で、不離に結合固定される。その他の部分の構成及び作用は、前述した実施の形態の第１例と同様であるから、同等部分に関する図示並びに説明は省略する。 [Fourth Example of Embodiment]
7 to 8 show a fourth example of an embodiment of the present invention corresponding to claim 1 . In the case of this example, the outer peripheral surface shape of the protruding portion 32a formed to protrude from the inner end surface in the axial direction of the cap nut 31a is inclined in a direction in which the outer diameter increases toward the tip edge (the inner end edge in the axial direction). Tapered surface. Outer diameter d 32a of a free state of such protrusion 32a is equal to the inner diameter R 27 in the free state of the through-hole 27, slightly smaller than the inner diameter R 27 (d 32a ≦ R 27). When the cap nut 31a provided with such a protrusion 32a is fixed to the outer surface in the axial direction of the bottom plate portion 24 of the cover 22, first, as shown in FIG. Insert into the through hole 27. Next, the cap nut 31a is strongly pressed against the bottom plate portion 24 by a press machine or the like. By this pressing operation, as shown in FIG. 8B, the axially inner end portion of the main body portion of the cap nut 31 a that is a regular hexagon that is a kind of non-circular polygon is formed in the bottom plate portion 24. Then, it sinks into the peripheral portion of the through hole 27. At the same time, the meat at the peripheral edge of the through hole 27 is displaced radially inward and bites into the base end of the protrusion 32a. As a result, the cap nut 31a is prevented from rotating with respect to the bottom plate portion 24 even when the bolt 37 (see FIG. 4) is tightened (because the regular hexagonal portion bites into the bottom plate portion 24). In this state, it is fixedly connected and fixed. Since the configuration and operation of other parts are the same as those of the first example of the above-described embodiment, illustration and description regarding the equivalent parts are omitted.

［実施の形態の第５例］
図９は、請求項１に対応する、本発明の実施の形態の第５例を示している。本例の場合には、エンコーダ３を構成する芯金１８のうちで、円輪部２１の内径寄り部分の軸方向外側面を、内輪７の軸方向内端面に当接させている。本例は、この様な構造により、上記エンコーダ３の軸方向に関する位置決め精度の向上並びに軸方向寸法の短縮を図っている。その他の部分の構成及び作用は、前述した実施の形態の第１〜４例の何れかと同様であるから、同等部分に関する図示並びに説明は省略する。 [Fifth Example of Embodiment]
FIG. 9 shows a fifth example of the embodiment of the invention corresponding to the first aspect. In the case of this example, in the core bar 18 constituting the encoder 3, the axially outer surface of the portion near the inner diameter of the annular ring portion 21 is brought into contact with the axially inner end surface of the inner ring 7. In this example, with such a structure, the positioning accuracy in the axial direction of the encoder 3 is improved and the axial dimension is shortened. Since the configuration and operation of the other parts are the same as those in any of the first to fourth examples of the embodiment described above, illustration and description regarding the equivalent parts are omitted.

［実施の形態の第６例］
図１０は、請求項１に対応する、本発明の実施の形態の第６例を示している。本例の場合には、カバー２２ａを構成する円筒部２３ａの直径（内径ｒ23a 、Ｒ23a ）が、この円筒部２３ａの軸方向中間部に形成した鍔部２５よりも軸方向外寄り（ｒ23a ）で小さく、軸方向内寄り（Ｒ23a ）で大きくなっている（Ｒ23a ＞ｒ23a ）。この様な本例の場合、底板部２４ａの直径を大きくし、この底板部２４ａの径方向外端部に設ける挿入孔２６の径方向位置を、先に述べた各実施の形態の場合に比べて外寄りにできる。この結果、永久磁石１９のうちでセンサが対向する部分の直径を大きくして、回転速度を表す信号を大きくしたり、回転速度検出の精度向上を図れる。
その他の部分の構成及び作用は、前述した実施の形態の第１〜５例の何れかと同様であるから、同等部分に関する図示並びに説明は省略する。 [Sixth Example of Embodiment]
FIG. 10 shows a sixth example of the embodiment of the present invention corresponding to the first aspect. In the case of this example, the diameter (inner diameters r 23a , R 23a ) of the cylindrical portion 23a constituting the cover 22a is more outward in the axial direction than the flange portion 25 formed in the axial intermediate portion of the cylindrical portion 23a (r 23a ) is small, and axially inward ( R23a ) is large ( R23a > r23a ). In the case of this example, the diameter of the bottom plate portion 24a is increased, and the radial position of the insertion hole 26 provided in the radially outer end portion of the bottom plate portion 24a is compared to the case of each embodiment described above. Can be outside. As a result, the diameter of the portion of the permanent magnet 19 facing the sensor can be increased to increase the signal representing the rotation speed, and the accuracy of rotation speed detection can be improved.
Since the configuration and operation of the other parts are the same as those in any of the first to fifth examples of the embodiment described above, illustration and description regarding the equivalent parts are omitted.

［実施の形態の第７例］
図１１は、請求項１に対応する、本発明の実施の形態の第７例を示している。本例の場合には、カバー２２ｂを構成する円筒部２３ｂの軸方向外端寄り部分の断面形状をクランク形にしている。そして、この円筒部２３ｂの軸方向外端部を、外輪１の軸方向内端部に外嵌している。本例の場合、この様な構成により、底板部２４ｂの直径を大きくし、この底板部２４ｂの径方向外端部に設ける挿入孔２６の径方向位置を外寄りにしている。尚、本例の場合、上記外輪１の内径ｒ1 は、この外輪１の中心軸αを中心として上記挿入孔２６の内周面に内接する円の直径Ｒよりも小さくなる（ｒ1 ＜Ｒ）。
その他の部分の構成及び作用は、上述した実施の形態の第６例と同様であるから、同等部分に関する図示並びに説明は省略する。 [Seventh example of embodiment]
FIG. 11 shows a seventh example of the embodiment of the invention corresponding to claim 1. In the case of this example, the cross-sectional shape of the portion near the outer end in the axial direction of the cylindrical portion 23b constituting the cover 22b is a crank shape. The outer end portion in the axial direction of the cylindrical portion 23 b is externally fitted to the inner end portion in the axial direction of the outer ring 1. In the case of this example, with such a configuration, the diameter of the bottom plate portion 24b is increased, and the radial position of the insertion hole 26 provided in the radially outer end portion of the bottom plate portion 24b is set outward. In the case of this example, the inner diameter r 1 of the outer ring 1 is smaller than the diameter R of a circle inscribed in the inner peripheral surface of the insertion hole 26 around the central axis α of the outer ring 1 (r 1 <R ).
Since the configuration and operation of the other parts are the same as in the sixth example of the above-described embodiment, illustration and description regarding the equivalent parts are omitted.

［実施の形態の第８例］
図１２は、請求項３に対応する、本発明の実施の形態の第８例を示している。本例の場合には、袋ナット３１ｂを底板部２４ｂの外側面に、溶接固定している。この袋ナット３１ｂの軸方向内端面には、突出部は設けていない。又、溶接は、円周方向２〜３個所を溶接するスポット溶接により行ない、溶接時の熱による影響を極力抑えている。そして、上記袋ナット３１ｂの外周面と上記底板部２４ｂの外側面との間に、シリコン系のコーキング剤を塗布した後、カバー２２ｂの表裏両面と袋ナット３１ｂとに防食の為のカチオン塗装を施している。
その他の部分の構成及び作用は、上述した実施の形態の第７例と同様であるから、同等部分に関する図示並びに説明は省略する。 [Eighth Example of Embodiment]
FIG. 12 shows an eighth example of the embodiment of the present invention corresponding to the third aspect. In the case of this example, the cap nut 31b is welded and fixed to the outer surface of the bottom plate portion 24b. No protrusion is provided on the inner end surface in the axial direction of the cap nut 31b. Further, welding is performed by spot welding in which two to three locations in the circumferential direction are welded, and the influence of heat during welding is suppressed as much as possible. And after apply | coating a silicon-type caulking agent between the outer peripheral surface of the said cap nut 31b, and the outer surface of the said baseplate part 24b, the cation coating for anticorrosion is carried out to the front and back both surfaces of the cover 22b, and the cap nut 31b. Has been given.
Since the configuration and operation of the other parts are the same as in the seventh example of the above-described embodiment, illustration and description regarding equivalent parts are omitted.

１ 外輪
２ ハブ
３、３ａ、３ｂ エンコーダ
４ センサ
５ 外輪軌道
６ ハブ本体
７ 内輪
８ 小径段部
９ 円筒部
１０ かしめ部
１１ 内輪軌道
１２ 転動体
１３ 保持器
１４ 回転側フランジ
１５ 静止側フランジ
１６ シールリング
１７ 空間
１８ａ、１８ｂ 芯金
１９ 永久磁石
２０ 円筒部
２１、２１ａ 円輪部
２２、２２ａ、２２ｂ カバー
２３、２３ａ、２３ｂ 円筒部
２４、２４ａ、２４ｂ 底板部
２５ 鍔部
２６ 挿入孔
２７ 貫通孔
２８ ホルダ
２９ 挿入部
３０ 小円筒部
３１、３１ａ、３１ｂ 袋ナット
３２、３２ａ 突出部
３３ 先半部
３４ 基半部
３５ 取付フランジ部
３６ 取付孔
３７ ボルト
３８ Ｏリング
３９ スタッド
４０ 係止溝
４１ 円輪部 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Hub 3, 3a, 3b Encoder 4 Sensor 5 Outer ring raceway 6 Hub body 7 Inner ring 8 Small diameter step part 9 Cylindrical part 10 Caulking part 11 Inner ring raceway 12 Rolling element 13 Cage 14 Rotation side flange 15 Stationary side flange 16 Seal ring 17 Space 18a, 18b Core metal 19 Permanent magnet 20 Cylindrical part 21, 21a Ring part 22, 22a, 22b Cover 23, 23a, 23b Cylindrical part 24, 24a, 24b Bottom plate part 25 Hook part 26 Insertion hole 27 Through hole 28 Holder 29 Insertion portion 30 Small cylindrical portion 31, 31a, 31b Cap nut 32, 32a Protruding portion 33 Leading half portion 34 Base half portion 35 Mounting flange portion 36 Mounting hole 37 Bolt 38 O-ring 39 Stud 40 Locking groove 41 Annular portion

Claims (3)

内周面に外輪軌道を有し、使用時にも回転しない外輪と、外周面に内輪軌道を有し、使用時に回転するハブと、この内輪軌道と上記外輪軌道との間に転動自在に設けられた複数個の転動体と、このハブの軸方向内端部若しくは内端寄り部分にこのハブと同心に固定された、その被検出面の特性を、円周方向に関して交互に変化させたエンコーダと、上記外輪の軸方向内端部に、この外輪の軸方向内端開口部を塞ぐ状態で固定された、金属板製で円筒部の軸方向内端部を底板部で塞いだ有底円筒状のカバーと、このカバーの一部で上記エンコーダと対向する部分に設けられた挿入孔と、このエンコーダの被検出面に対向する状態で設けられ、このエンコーダの回転に伴って出力を変化させるセンサとを備え、このセンサはホルダに保持されており、このホルダは、このセンサを保持した状態で上記挿入孔に挿入される挿入部と、この挿入部の軸方向内端部にその基端部を結合した取付フランジ部とを備えている回転速度検出装置付転がり軸受ユニットに於いて、上記カバーのうち、上記ホルダの挿入部を上記挿入孔に挿入した状態で上記取付フランジの先端部に形成した取付孔が対向する部分に、上記カバーの軸方向両側面同士を通じさせる貫通孔が形成されており、この貫通孔部分で上記底板部の軸方向外側面に、軸方向外端部が閉じられ、軸方向内端面の中央部にねじ孔が開口し、軸方向内端面に突出部が設けられた袋ナットが、このねじ孔と上記貫通孔とを整合させた状態で、この突出部をこの貫通孔に内嵌する事により結合固定されており、上記底板部と上記袋ナットとの結合部は、少なくともこの底板部の軸方向外側面とこの袋ナットの外周面とに、これら底板部と袋ナットとを互いに結合した状態で塗装を施す事により密封されており、上記ホルダは、上記取付孔に挿通したボルトを上記ねじ孔に螺合する事により、上記カバーに対し支持固定されている事を特徴とする回転速度検出装置付転がり軸受ユニット。 An outer ring that has an outer ring raceway on the inner peripheral surface, and an outer ring that does not rotate during use, a hub that has an inner ring raceway on the outer peripheral surface and that rotates during use, and is provided between the inner ring raceway and the outer ring raceway so as to be able to roll. A plurality of rolling elements, and an encoder that is fixed concentrically with the hub at the axially inner end portion or the inner end portion of the hub, and whose characteristics of the detected surface are alternately changed in the circumferential direction. And a bottomed cylinder made of a metal plate and closed at the inner end in the axial direction of the outer ring with the bottom plate portion closed at the inner end in the axial direction of the cylindrical portion. A cover, an insertion hole provided in a portion of the cover facing the encoder, and a surface facing the detection surface of the encoder, and the output is changed as the encoder rotates. The sensor is held by a holder. The holder includes an insertion portion that is inserted into the insertion hole while holding the sensor, and a mounting flange portion that has a base end portion coupled to an axial inner end portion of the insertion portion. In the rolling bearing unit with a detector, the shaft of the cover is placed on a portion of the cover facing the mounting hole formed at the tip of the mounting flange in a state where the insertion portion of the holder is inserted into the insertion hole. A through-hole is formed through both side surfaces in the direction. The through-hole part closes the axially outer end on the axially outer surface of the bottom plate and opens a screw hole in the center of the axially inner end surface. A cap nut having a protruding portion on the inner end surface in the axial direction is coupled and fixed by fitting the protruding portion into the through hole in a state where the screw hole and the through hole are aligned. The bottom plate and the cap nut Parts are at least axially outer side of the bottom plate portion and to the outer peripheral surface of the cap nut, is sealed by applying a coating and the cap nut these bottom plate portion in a state coupled together, the holder, the A rolling bearing unit with a rotational speed detecting device, wherein a bolt inserted into the mounting hole is screwed into the screw hole, and is supported and fixed to the cover. 突出部の外周面に凹凸が設けられており、この突出部を貫通孔に内嵌した状態でこの凹凸部をこの貫通孔の内周面と係合させる事により、この貫通孔の内側での上記突出部の回転を阻止している、請求項１に記載した回転速度検出装置付転がり軸受ユニット。 Concavities and convexities are provided on the outer peripheral surface of the protruding portion, and by engaging the concave and convex portions with the inner peripheral surface of the through hole in a state in which the protruding portion is fitted in the through hole, The rolling bearing unit with a rotation speed detection device according to claim 1 , wherein rotation of the protrusion is prevented. 内周面に外輪軌道を有し、使用時にも回転しない外輪と、外周面に内輪軌道を有し、使用時に回転するハブと、この内輪軌道と上記外輪軌道との間に転動自在に設けられた複数個の転動体と、このハブの軸方向内端部若しくは内端寄り部分にこのハブと同心に固定された、その被検出面の特性を、円周方向に関して交互に変化させたエンコーダと、上記外輪の軸方向内端部に、この外輪の軸方向内端開口部を塞ぐ状態で固定された、金属板製で円筒部の軸方向内端部を底板部で塞いだ有底円筒状のカバーと、このカバーの一部で上記エンコーダと対向する部分に設けられた挿入孔と、このエンコーダの被検出面に対向する状態で設けられ、このエンコーダの回転に伴って出力を変化させるセンサとを備え、このセンサはホルダに保持されており、このホルダは、このセンサを保持した状態で上記挿入孔に挿入される挿入部と、この挿入部の軸方向内端部にその基端部を結合した取付フランジ部とを備えている回転速度検出装置付転がり軸受ユニットに於いて、上記カバーのうち、上記ホルダの挿入部を上記挿入孔に挿入した状態で上記取付フランジの先端部に形成した取付孔が対向する部分に、上記カバーの軸方向両側面同士を通じさせる貫通孔が形成されており、この貫通孔部分で上記底板部の軸方向外側面に、軸方向外端部が閉じられ、軸方向内端面の中央部にねじ孔が開口した袋ナットが、このねじ孔と上記貫通孔とを整合させた状態で、この袋ナットを上記底板部に溶接する事により結合固定されており、これら底板部と袋ナットとの結合部は、少なくともこの底板部の軸方向外側面とこの袋ナットの外周面とに、これら底板部と袋ナットとを互いに結合した状態で塗装を施す事により密封されており、上記ホルダは、上記取付孔に挿通したボルトを上記ねじ孔に螺合する事により、上記カバーに対し支持固定されている事を特徴とする回転速度検出装置付転がり軸受ユニット。 An outer ring that has an outer ring raceway on the inner peripheral surface, and an outer ring that does not rotate during use, a hub that has an inner ring raceway on the outer peripheral surface and that rotates during use, and is provided between the inner ring raceway and the outer ring raceway so as to be able to roll. A plurality of rolling elements, and an encoder that is fixed concentrically with the hub at the axially inner end portion or the inner end portion of the hub, and whose characteristics of the detected surface are alternately changed in the circumferential direction. And a bottomed cylinder made of a metal plate and closed at the inner end in the axial direction of the outer ring with the bottom plate portion closed at the inner end in the axial direction of the cylindrical portion. A cover, an insertion hole provided in a portion of the cover facing the encoder, and a surface facing the detection surface of the encoder, and the output is changed as the encoder rotates. The sensor is held by a holder. The holder includes an insertion portion that is inserted into the insertion hole while holding the sensor, and a mounting flange portion that has a base end portion coupled to an axial inner end portion of the insertion portion. In the rolling bearing unit with a detector, the shaft of the cover is placed on a portion of the cover facing the mounting hole formed at the tip of the mounting flange in a state where the insertion portion of the holder is inserted into the insertion hole. A through-hole is formed through both side surfaces in the direction. The through-hole part closes the axially outer end on the axially outer surface of the bottom plate and opens a screw hole in the center of the axially inner end surface. In the state where the screw hole and the through-hole are aligned , the cap nut is joined and fixed by welding the cap nut to the bottom plate portion, and the joint portion between the bottom plate portion and the cap nut is: At least the axis of the bottom plate In a direction outer side surface and the outer peripheral surface of the cap nut, is sealed by applying a coating and the cap nut these bottom plate portion in a state coupled together, the holder, said screw bolt inserted through the above mounting hole A rolling bearing unit with a rotational speed detection device, wherein the rolling bearing unit is fixed to the cover by being screwed into a hole.
JP2009239443A 2009-10-16 2009-10-16 Rolling bearing unit with rotational speed detector Expired - Fee Related JP5045725B2 (en)

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JP5592130B2 (en) * 2010-03-18 2014-09-17 Ｎｔｎ株式会社 Wheel bearing device with rotation speed detector
DE102010028232A1 (en) 2010-04-27 2011-10-27 Robert Bosch Gmbh Sensor assembly for a vehicle and device for detecting rotational movements of a wheel bearing
JP6114604B2 (en) * 2013-03-27 2017-04-12 Ntn株式会社 Wheel bearing device with rotation speed detector

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