JP2012036960A - Sealing device of rolling bearing unit - Google Patents

Sealing device of rolling bearing unit Download PDF

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JP2012036960A
JP2012036960A JP2010177039A JP2010177039A JP2012036960A JP 2012036960 A JP2012036960 A JP 2012036960A JP 2010177039 A JP2010177039 A JP 2010177039A JP 2010177039 A JP2010177039 A JP 2010177039A JP 2012036960 A JP2012036960 A JP 2012036960A
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wheel
cap
stationary
fixed
unit
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JP5561007B2 (en
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Yasuhiro Maeda
康博 前田
Toshiki Hayashi
俊樹 林
Atsuya Kano
敦哉 加野
Takashi Sakaguchi
尚 坂口
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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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/768—Sealings of ball or roller bearings between relatively stationary parts, i.e. static seals
    • 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
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/30—Material joints
    • F16C2226/36—Material joints by welding
    • 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)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device of a rolling bearing unit, in which adhesion is enhanced, which can prevent falling down, enhance stationary stability, and prevent entry of foreign matter.SOLUTION: The sealing device (cap) 26 keeps the inside of the rolling bearing unit A, which includes a stationary wheel 2, a rotation wheel 4 (hub 12 and the inner wheel constituting body 16) and a roller 18, in a sealed condition by sealing from the outside. The sealing device includes a bottom 26a covering the one side end of the unit in the axial direction, and a fixed part 26b continuously formed in the peripheral fringe of the bottom and fixed to the stationary wheel. The fixing structure of the fixed part to the stationary wheel is intended to be included by applying the any measure of the intervention of the elastic body 28 (and the protrusion 28b of the same) to the fixed part of the fixed section and the stationary wheel, the engagement by the uneven shape (groove 2f, protrusion 26k, protrusion 28b), or the bonding of the exposed part 32 of the fixed part by the laser welding.

Description

本発明は、転がり軸受ユニットにおいて、その内部を外部から封止して密封状態(気密状態、及び液密状態)に保つための密封装置の改良に関し、具体的には、自動車の車輪(駆動輪や従動輪)を支持するためのハブユニット軸受における、密封装置(一例として、キャップ(カバー))の脱落防止や静止安定性、当該密封装置の密封性能(耐浸水性など)の向上に関する。   The present invention relates to an improvement in a sealing device for sealing the inside of a rolling bearing unit from the outside to keep it in a sealed state (airtight state and liquid-tight state). Further, the present invention relates to prevention of dropping off of a sealing device (for example, a cap (cover)) and stationary stability in a hub unit bearing for supporting a driven wheel), and improvement of sealing performance (such as water resistance) of the sealing device.

従来から、転がり軸受ユニットには、ユニットの内部を外部から封止して密封状態(気密状態、及び液密状態)に保つために各種の密封装置が設けられており、当該密封装置を設けることで、ユニットの外部から異物(例えば、泥水、塵埃など)が内部に侵入することを防止しているとともに、内部に封入された潤滑剤(例えば、グリース、潤滑油など)が外部へ漏洩することを防止している。その際、密封装置としては、鋼板等を断面が略Ｌ字状を成すようにプレス加工などにより曲げ成形した環状の芯金の一部に、各種の弾性材(例えば、ゴムやプラスチックなどの樹脂材)を連結してリップを形成してなる接触型のシール、ステンレス板、鉄板等の金属板をプレス加工などにより曲げ成形した非接触型のシールド、あるいは、これらの接触型シールと非接触型シールド(いわゆるスリンガ)とを断面形状が略箱形(矩形)状となるように組み合わせ、パッケージ構造とした接触型の密封装置(いわゆるパックシール)などが用いられている。これらの密封装置は、基本的に回転構造をなすものであるが、このような回転タイプの他にも、転がり軸受ユニットの軸方向端部(いわゆるインボード側もしくはアウトボード側の端部)を覆って閉塞するような静止構造をなすキャップ(底部を有する略円筒状のカバー部材)などが知られており、転がり軸受ユニットの使用条件や使用目的などに応じて要求される密封性(気密性や液密性)のレベルによって、かかる密封装置が適宜使い分けられるとともに、複数を組み合わせて使用されている。   Conventionally, a rolling bearing unit has been provided with various sealing devices to seal the inside of the unit from the outside and keep it in a sealed state (airtight state and liquid tight state). This prevents foreign matter (e.g., muddy water, dust, etc.) from entering the inside of the unit, and lubricant (e.g., grease, lubricating oil, etc.) enclosed inside leaks to the outside. Is preventing. At that time, as a sealing device, various elastic materials (for example, resins such as rubber and plastic) are formed on a part of an annular core bar formed by bending a steel plate or the like so that the cross-section is substantially L-shaped. A contact-type seal formed by connecting a material) to form a lip, a non-contact type shield formed by bending a metal plate such as a stainless steel plate or an iron plate by pressing or the like, or these contact type seal and non-contact type A contact-type sealing device (so-called pack seal) or the like having a package structure in which a shield (so-called slinger) is combined so that the cross-sectional shape is substantially box-shaped (rectangular) is used. These sealing devices basically have a rotating structure, but in addition to such a rotating type, the axial end of the rolling bearing unit (the end on the inboard side or the outboard side) is used. Caps that form a stationary structure that covers and closes (substantially cylindrical cover member with a bottom) are known, and the sealing performance (airtightness) required according to the usage conditions and purpose of the rolling bearing unit is known. Such sealing devices are properly used depending on the level of (liquid tightness) and a plurality of sealing devices are used in combination.

例えば、密封装置としてキャップ(カバー)を使用し、転がり軸受ユニットの軸方向端部を閉塞する場合、当該キャップを転がり軸受ユニットの静止輪(一例として、外輪)に固定する。その際、金属製のキャップであれば、外輪の外周面や内周面、あるいは軸方向端面などに当該キャップを嵌合させることで、かかるキャップを位置決め固定する。このようにキャップを外輪(内外周面や端面)に嵌合させた場合、その密封性能は、かかるキャップの外輪に対する嵌合構造によって大きく左右される。
このため、従来から静止輪(一例として、外輪)に対する嵌合構造の改良などの観点から、静止輪に対するキャップの密着性を高め、かかる静止輪からの脱落防止や当該静止輪に対する静止安定性の向上を図るべく、各種の方策が講じられている。 For example, when a cap (cover) is used as a sealing device and the axial end of the rolling bearing unit is closed, the cap is fixed to a stationary ring (an outer ring as an example) of the rolling bearing unit. At that time, if the cap is made of metal, the cap is positioned and fixed by fitting the cap onto the outer peripheral surface, the inner peripheral surface, or the axial end surface of the outer ring. When the cap is fitted to the outer ring (inner and outer peripheral surfaces and end surfaces) in this way, the sealing performance is greatly influenced by the fitting structure of the cap with respect to the outer ring.
For this reason, from the standpoint of improving the fitting structure with respect to a stationary wheel (for example, the outer ring), it is possible to improve the adhesion of the cap to the stationary wheel, to prevent the stationary wheel from falling off and to improve the stationary stability with respect to the stationary wheel. Various measures have been taken to improve.

特許文献１には、凸状に突出した複数の爪部をキャップの外周面に設けるとともに、凹状に窪んだ溝部を外輪のアウトボード側端部内周面(ホイールパイロット部)に設け、これらの爪部を溝部に係合させてキャップを位置決め固定した転がり軸受ユニットの構成が一例として開示されている。これにより、キャップの脱落防止を図るとともに、静止安定性を高めることを可能としている。その一方で、キャップの爪部は、キャップ外周部の数箇所を切り起こし加工し、切片を外方(拡径方向)へ立ち上げることで構成されているため、かかる爪部(切片)を形成するためにキャップ外周部に切り起こし加工を施す際、当該外周部の真円度の悪化を招き易い。かかるキャップ外周部は外輪との嵌合部となっており、その真円度が悪化すると、キャップと外輪との密着性の低下を誘引することとなる。したがって、特許文献１に開示された構成では、爪部を溝部に係合させることでキャップの脱落防止を図るとともに、静止安定性を高めることは可能となるが、当該キャップと外輪との密着性が悪く、密封性能の向上に十分に寄与するものとはなっていない。   In Patent Document 1, a plurality of claw portions protruding in a convex shape are provided on the outer peripheral surface of the cap, and a groove portion recessed in a concave shape is provided on the inner peripheral surface (wheel pilot portion) of the outer end of the outer ring. A configuration of a rolling bearing unit in which a cap is positioned and fixed by engaging a portion with a groove is disclosed as an example. As a result, the cap can be prevented from falling off and the stationary stability can be enhanced. On the other hand, the claw part of the cap is formed by cutting up and processing several places on the outer periphery of the cap and raising the section outward (in the diameter expansion direction), thus forming such a claw part (section) Therefore, when the cap outer periphery is cut and raised, the roundness of the outer periphery tends to deteriorate. The outer peripheral part of the cap is a fitting part with the outer ring, and when the roundness is deteriorated, a decrease in the adhesion between the cap and the outer ring is induced. Therefore, in the configuration disclosed in Patent Document 1, it is possible to prevent the cap from falling off by engaging the claw portion with the groove portion, and it is possible to improve the stationary stability, but the adhesion between the cap and the outer ring is improved. However, it does not sufficiently contribute to the improvement of the sealing performance.

また、特許文献２には、凸状に突出する条部をキャップ(センサホルダ)の内周面に全周に亘って連続して設けるとともに、凹状に窪んだ溝部を外輪のインボード側端部外周面に全周に亘って連続して設け、前記条部を当該溝部に係合させてキャップを位置決め固定した転がり軸受ユニットの構成が一例として開示されている。これにより、上述した特許文献１の場合と同様に、キャップの脱落防止を図るとともに、静止安定性を高めることを可能としている。その一方で、これら条部と溝部の係合部分は、ユニットの外部に露出された状態となっているため、外輪外周部に設けられた溝部(凹環状の窪み)と条部の間に毛細管現象で水などを保持し易く、その部分からの発錆を招き易い。また、プレスのし易いＳＥＣＣ(めっき鋼板)をキャップの素材として用いるような場合、条部は断面、換言すれば、めっきで覆われていない面となるので、発錆し易い。溝部近傍や条部から発錆した場合、キャップの外輪に対する嵌合力の低下は避けられず、結果として、キャップと外輪との密着性の低下を誘引することとなる。したがって、特許文献２に開示された構成であっても、キャップによる密封性能の向上に確実に寄与するものとはなっていない。   Further, in Patent Document 2, a protrusion that protrudes in a convex shape is continuously provided on the inner peripheral surface of a cap (sensor holder) over the entire circumference, and a groove that is recessed in a concave shape is provided on the inboard side end of the outer ring. A configuration of a rolling bearing unit in which the outer peripheral surface is continuously provided over the entire circumference and the cap is positioned and fixed by engaging the strip portion with the groove portion is disclosed as an example. As a result, as in the case of Patent Document 1 described above, it is possible to prevent the cap from falling off and to improve the stationary stability. On the other hand, since the engaging portion between the strip and the groove is exposed to the outside of the unit, a capillary tube is formed between the groove (concave annular recess) provided on the outer peripheral portion of the outer ring and the strip. It is easy to hold water or the like due to the phenomenon, and easily rusts from that part. In addition, when SECC (plated steel plate) that is easy to press is used as a material for the cap, the strip portion has a cross-section, in other words, a surface that is not covered with plating, and thus rusts easily. When rusting occurs from the vicinity of the groove portion or the strip portion, a decrease in the fitting force of the cap to the outer ring is inevitable, and as a result, a decrease in the adhesion between the cap and the outer ring is induced. Therefore, even the configuration disclosed in Patent Document 2 does not surely contribute to the improvement of the sealing performance by the cap.

特開２００９−１４４７９１号公報JP 2009-144791 A 特開２００６−１７７８９７号公報JP 2006-177897 A

本発明は、このような課題を解決するためになされており、その目的は、軌道輪(一例として、静止輪)に対する固定構造(同、嵌合構造)の改良を図ることにより、軌道輪に対する密着性を高め、かかる軌道輪からの脱落防止や当該軌道輪に対する静止安定性の向上を図るとともに、前記嵌合部分からの異物(例えば、泥水や塵埃など)の侵入、及びユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩の防止を図ることを可能とする転がり軸受ユニットの密封装置(一例として、キャップ)を提供することにある。   The present invention has been made in order to solve such a problem, and the object thereof is to improve the fixing structure (the fitting structure) for the bearing ring (as an example, a stationary ring). It improves adhesion, prevents falling off of the bearing ring, and improves the stability of the bearing ring.In addition, foreign matter (e.g., muddy water and dust) enters from the fitting part and is enclosed inside the unit. Another object of the present invention is to provide a rolling bearing unit sealing device (for example, a cap) that can prevent leakage of lubricant (for example, grease or lubricating oil) to the outside.

このような目的を達成するために、本発明に係る転がり軸受ユニットの密封装置は、車体構成部材に固定されて非回転状態に維持される静止輪と、当該静止輪に対向配置され、車輪構成部材を固定して当該車輪構成部材とともに回転する回転輪と、これらの静止輪及び回転輪にそれぞれ形成されて相互に対向する軌道溝間へ転動可能に組み込まれた複数の転動体とを備えた車輪支持用転がり軸受ユニットにおいて、ユニットの内部を外部から封止して密封状態に保つものであり、前記ユニットの軸方向の一方側端部を覆う底部と、当該底部の周縁部に連続して成形され、前記静止輪へ固定するための固定部を備えており、前記固定部には、その外周部及び内周部の少なくとも一方に対し、前記静止輪の固定部位との間に介在されるように弾性材で成形された弾性体が連結されている。   In order to achieve such an object, a rolling bearing unit sealing device according to the present invention includes a stationary wheel that is fixed to a vehicle body component member and maintained in a non-rotating state, and is disposed to face the stationary wheel. A rotating wheel that fixes a member and rotates together with the wheel constituent member, and a plurality of rolling elements that are formed on the stationary wheel and the rotating wheel, respectively, and are incorporated so as to be able to roll between the mutually facing raceway grooves. In the wheel support rolling bearing unit, the inside of the unit is sealed from the outside so as to be kept in a hermetically sealed state, and is continuous with the bottom portion covering one end portion in the axial direction of the unit and the peripheral portion of the bottom portion. And is provided with a fixing portion for fixing to the stationary wheel, and the fixing portion is interposed between the stationary portion of the stationary wheel and at least one of the outer peripheral portion and the inner peripheral portion thereof. Elastic as In molded elastic body is connected.

あるいは、前記静止輪に対し、前記固定部の固定部位となる前記回転輪との対向周面を凹状に窪ませてなる溝部を全周に亘って連続して形成し、前記密封装置は、前記固定部に前記静止輪の溝部と係合可能な突出部を配設し、当該突出部を当該固定部の前記静止輪との対向周部を全周に亘って連続して凸状に突出させて形成するとともに、前記突出部を前記溝部と係合させた際の係合部分が前記底部及び前記固定部によって前記ユニットの外部から閉塞される構成としてもよい。   Alternatively, with respect to the stationary wheel, a groove portion formed by recessing the opposing circumferential surface of the rotating wheel that is a fixing portion of the fixing portion in a concave shape is continuously formed over the entire circumference, and the sealing device includes the Protrusions that can be engaged with the grooves of the stationary wheel are arranged on the fixed part, and the projecting parts are projected in a convex shape continuously around the entire circumference of the fixed part facing the stationary wheel. The engaging portion when the projecting portion is engaged with the groove portion may be closed from the outside of the unit by the bottom portion and the fixing portion.

また、前記密封装置は、前記固定部の前記静止輪との固定部位のうち、前記ユニットの外部へ露出される部位がレーザー溶接によって当該静止輪に対して接合される構成であってもよい。   The sealing device may be configured such that a portion of the fixing portion that is fixed to the stationary wheel and a portion exposed to the outside of the unit is joined to the stationary wheel by laser welding.

本発明によれば、軌道輪(一例として、静止輪)に対する固定構造(同、嵌合構造)の改良を図ること、具体的には、嵌合部分への弾性体の介在、凹凸形状による係合、レーザー溶接の各手段を講じることで、軌道輪に対する密着性を高め、かかる軌道輪からの脱落防止や当該軌道輪に対する静止安定性の向上を図るとともに、前記嵌合部分からの異物(例えば、泥水や塵埃など)の侵入、及びユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩の防止を図ることが可能な転がり軸受ユニットの密封装置(一例として、キャップ)を実現することができる。   According to the present invention, it is possible to improve the fixing structure (the same fitting structure) for the raceway ring (for example, a stationary ring), specifically, the interposition of the elastic body in the fitting part, the engagement by the uneven shape. In this case, by taking each means of laser welding, the adhesion to the raceway is improved, the falloff from the raceway is prevented and the stationary stability with respect to the raceway is improved, and foreign matter (e.g., from the fitting portion) A rolling bearing unit sealing device that can prevent intrusion of muddy water, dust, etc.) and leakage of lubricant (e.g. grease, lubricating oil, etc.) enclosed inside the unit to the outside. Cap) can be realized.

本発明の一実施形態に係る車輪支持用転がり軸受ユニット(ハブユニット軸受)の全体構成を示す断面図である。It is sectional drawing which shows the whole structure of the rolling bearing unit for wheel support (hub unit bearing) which concerns on one Embodiment of this invention. 本発明の第１実施形態に係る密封装置(キャップ)の構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the sealing device (cap) which concerns on 1st Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap. キャップのハブユニット軸受への装着前の構成を示す図であって、(ａ)は、図２に示すキャップ(周縁部のみを弾性体で被覆したキャップ)の要部拡大断面図、(ｂ)は、図３(ａ)に示す構成において、底部のインボード側の表面領域全体を弾性体で被覆したキャップの要部拡大断面図、(ｃ)は、段差構造の底部の段差を弾性体で埋設するとともに、溝部を形成したキャップの要部拡大断面図、(ｄ)は、図３(ｃ)に示す構成において、溝部の形成を省略したキャップの要部拡大断面図である。It is a figure which shows the structure before mounting | wearing with the hub unit bearing of a cap, Comprising: (a) is a principal part expanded sectional view of the cap (cap | cover which covered only the peripheral part with the elastic body) shown in FIG. 2, (b). Fig. 3 (a) is an enlarged cross-sectional view of the main part of a cap in which the entire surface area on the inboard side of the bottom portion is covered with an elastic body, and Fig. 3 (c) is an elastic body showing the step at the bottom of the step structure. FIG. 3D is an enlarged cross-sectional view of a main part of the cap that is embedded and in which a groove is formed, and FIG. 3D is an enlarged cross-sectional view of the main part of the cap in which the formation of the groove is omitted in the configuration shown in FIG. 本発明の第２実施形態に係るキャップの構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the cap which concerns on 2nd Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap. 本発明の第２実施形態の変形例に係るキャップの構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the cap which concerns on the modification of 2nd Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap. 本発明の第３実施形態に係るキャップの構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the cap which concerns on 3rd Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap. 本発明の第４実施形態に係るキャップの構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the cap which concerns on 4th Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap. 本発明の第４実施形態の変形例に係るキャップの構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the cap which concerns on the modification of 4th Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap. 本発明の第５実施形態に係るキャップの構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the cap which concerns on 5th Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap. 本発明の第５実施形態の変形例に係るキャップの構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the cap which concerns on the modification of 5th Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap. 本発明の第６実施形態に係るキャップの構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the cap which concerns on 6th Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap. 本発明の第７実施形態に係るキャップの構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the cap which concerns on 7th Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap. 本発明の第８実施形態に係るキャップの構成を示す図であって、当該キャップをハブユニット軸受に装着した状態を示す要部断面図である。It is a figure which shows the structure of the cap which concerns on 8th Embodiment of this invention, Comprising: It is principal part sectional drawing which shows the state which mounted | wore the hub unit bearing with the said cap.

以下、本発明の転がり軸受ユニット(以下、単に軸受ユニットや軸受ともいう)の密封装置について、添付図面を参照して説明する。なお、本発明に係る密封装置が装着される軸受ユニットは、例えば、自動車や鉄道車両など、車輪で走行する各種車両において、前記車輪を回転自在に支持する軸受ユニットなどとして適用することができる。また、かかる軸受ユニットが支持する自動車の車輪は、従動輪(前置エンジン後輪駆動(ＦＲ)車及び後置エンジン後輪駆動(ＲＲ)車の前輪、前置エンジン前輪駆動(ＦＦ)車の後輪)、あるいは駆動輪(ＦＲ車及びＲＲ車の後輪、ＦＦ車の前輪及び四輪駆動車の全輪)のいずれであっても構わない。このため、ここでは、軸受ユニットが自動車の従動輪を支持するハブユニット軸受である場合を一例として想定し、以下、その構成を前提に説明する。なお、以下の説明においては、かかるハブユニット軸受が自動車に搭載された場合に、当該自動車の車体外方に相当する側(車輪側(図１から図１３の左側))をアウトボード側といい、その反対側、すなわち自動車の車体内方に相当する側(同各図の右側)をインボード側という。   Hereinafter, a sealing device for a rolling bearing unit (hereinafter also simply referred to as a bearing unit or a bearing) of the present invention will be described with reference to the accompanying drawings. Note that the bearing unit to which the sealing device according to the present invention is attached can be applied as a bearing unit that rotatably supports the wheel in various vehicles that run on wheels, such as automobiles and railway vehicles. Further, the wheels of the automobile supported by the bearing unit are driven wheels (front wheels of front engine rear wheel drive (FR) vehicles and rear engine rear wheel drive (RR) vehicles, front engine front wheel drive (FF) vehicles). Rear wheels) or driving wheels (rear wheels of FR and RR vehicles, front wheels of FF vehicles, and all wheels of four-wheel drive vehicles) may be used. For this reason, the case where the bearing unit is a hub unit bearing that supports a driven wheel of an automobile is assumed as an example, and the following description is based on the configuration. In the following description, when the hub unit bearing is mounted on a vehicle, the side corresponding to the outside of the vehicle body (the wheel side (left side in FIGS. 1 to 13)) is referred to as the outboard side. The opposite side, that is, the side corresponding to the inside of the car body (the right side in the figure) is called the inboard side.

図１には、本発明の一実施形態に係る転がり軸受ユニット(自動車の従動輪を支持するハブユニット軸受)Ａの構成が示されている。
ハブユニット軸受Ａは、車体構成部材(例えば、懸架装置のナックル(図示しない))に固定されて非回転状態に維持される静止輪２と、当該静止輪２に対向配置され、車輪構成部材(例えば、車輪のディスクホイール及び制動装置のロータ(ブレーキロータ)(いずれも図示しない))とともに回転する回転輪４と、これらの静止輪２及び回転輪４にそれぞれ形成されて相互に対向する複列(２列)の軌道溝２ｓ,４ｓ間及び軌道溝２ｔ,４ｔ間へ転動可能に組み込まれた複数の転動体１８とを備えている。すなわち、この場合、ハブユニット軸受Ａは、外輪側が静止輪２となるように構成されているとともに、内輪側が回転輪４となるように構成されている。転動体１８は、環状を成す保持器２０に形成されたポケット内に１つずつ回転自在に保持された状態で、軌道溝２ｓ,４ｓ間及び軌道溝２ｔ,４ｔ間を転動している。なお、転動体は、図１に示すような玉であってもよいし、各種のころ(円筒ころ、円すいころ及び球面ころなど)であっても構わない。また、保持器は、転動体の種類に応じて任意のタイプを適用すればよい。例えば、転動体が玉である場合、傾斜型(図１)、冠型及び波型などのタイプを適用することができ、転動体が各種のころ(円錐ころ、円筒ころ及び球面ころなど)である場合、もみ抜き型、くし型及びかご型などのタイプを適用することができる。転動体１８を保持器２０で保持することで、各転動体１８が相互に接触して摩擦が生じることによる回転抵抗の増大や、焼付きなどを防止することができるが、このような事態をさらに効果的に防止すべく、ハブユニット軸受Ａの内部には、潤滑剤(例えば、グリースや潤滑油など)を封入することが好ましい。 FIG. 1 shows a configuration of a rolling bearing unit (a hub unit bearing for supporting a driven wheel of an automobile) A according to an embodiment of the present invention.
The hub unit bearing A is fixed to a vehicle body constituent member (for example, a knuckle (not shown) of a suspension device) and is maintained in a non-rotating state, and is disposed opposite to the stationary wheel 2, and is provided with a wheel constituent member ( For example, a rotating wheel 4 that rotates together with a disc wheel of a wheel and a rotor (brake rotor) of a braking device (both not shown)), and a double row formed on the stationary wheel 2 and the rotating wheel 4 and facing each other. A plurality of rolling elements 18 are provided so as to be capable of rolling between the two rows of raceway grooves 2s and 4s and between the raceway grooves 2t and 4t. That is, in this case, the hub unit bearing A is configured such that the outer ring side becomes the stationary ring 2 and the inner ring side becomes the rotating wheel 4. The rolling elements 18 roll between the raceway grooves 2 s and 4 s and between the raceway grooves 2 t and 4 t in a state where the rolling elements 18 are rotatably held one by one in pockets formed in an annular cage 20. The rolling elements may be balls as shown in FIG. 1 or various rollers (cylindrical rollers, tapered rollers, spherical rollers, etc.). Moreover, what is necessary is just to apply arbitrary types for a holder | retainer according to the kind of rolling element. For example, when the rolling element is a ball, types such as an inclined type (Fig. 1), a crown type, and a corrugated type can be applied, and the rolling element can be various types of rollers (such as a tapered roller, a cylindrical roller, and a spherical roller). In some cases, types such as machined molds, comb molds and basket molds can be applied. By holding the rolling elements 18 with the cage 20, it is possible to prevent an increase in rotational resistance or seizure caused by the friction between the rolling elements 18 caused by mutual contact. In order to prevent it more effectively, it is preferable to enclose a lubricant (for example, grease or lubricating oil) inside the hub unit bearing A.

静止輪２には、その外周面２ａから外方(拡径方向)に向かって突出した固定フランジ２ｆが一体成形されており、当該固定フランジ２ｆを貫通する固定孔２ｈに固定用ボルト(図示しない)を挿通し、これを車体側に締結することで、静止輪２を懸架装置(サスペンション)のナックル(図示しない)に固定することができる。
回転輪４は、ディスクホイール及びブレーキロータ(いずれも図示しない)を固定してこれらとともに回転するハブ１２と、当該ハブ１２に配設される内輪構成体１６で構成されている。この場合、ハブ１２には、その外周部に静止輪２のアウトボード側の軌道溝２ｓと対向する軌道溝４ｓが形成され、内輪構成体１６には、その外周部に静止輪２のインボード側の軌道溝２ｔと対向する軌道溝４ｔが形成されている。 The stationary ring 2 is integrally formed with a fixing flange 2f that protrudes outward (in the diameter-enlarging direction) from the outer peripheral surface 2a, and a fixing bolt (not shown) is inserted into a fixing hole 2h that passes through the fixing flange 2f. ) And fastened to the vehicle body side, the stationary wheel 2 can be fixed to a knuckle (not shown) of a suspension device (suspension).
The rotating wheel 4 includes a hub 12 that rotates with a disk wheel and a brake rotor (both not shown) fixed thereto, and an inner ring structure 16 disposed on the hub 12. In this case, the hub 12 is formed with a raceway groove 4s facing the outboard side raceway groove 2s of the stationary wheel 2 on the outer periphery thereof, and the inner ring component 16 has an inboard of the stationary wheel 2 on the outer periphery thereof. A track groove 4t facing the side track groove 2t is formed.

内輪構成体１６は、ハブ１２のインボード側の外周縁部を全周に亘って縮径させるように凹ませてなる段部１２ｓまで圧入して外嵌された後、当該ハブ１２のインボード側端部を加締めることにより、ハブ１２の段部１２ｓと加締め部１２ｄとの間で挟み込まれた状態で当該ハブ１２へ位置決め固定される。これにより、内輪構成体１６(ひいては、軸受ユニット(ハブユニット軸受)Ａ)に対して所定の予圧が付与されている。
なお、このような加締固定に代えて、例えば、内輪構成体１６をハブ１２の段部１２ｓまで圧入外嵌した後、インボード側あるいはアウトボード側からナットなどの締結部材で締め付けることによって当該ハブ１２のインボード側に固定することも可能である。また、図１には、内輪構成体１６を１つだけ備え、当該内輪構成体１６をハブ１２のインボード側に配設(一例として、圧入後に加締め固定)した回転輪４の構成を示しているが、２つの内輪構成体を備え、これらの内輪構成体に静止輪２の軌道溝２ｔ,２ｓと対向する軌道溝４ｔ,４ｓをそれぞれ形成し、これらの内輪構成体をハブのインボード側及びアウトボード側にそれぞれ固定した回転輪の構成とすることも可能である。 The inner ring constituting body 16 is press-fitted to the stepped portion 12s formed by recessing the outer peripheral edge portion on the inboard side of the hub 12 so as to reduce the diameter over the entire circumference, and then the inboard of the hub 12 is fitted. By caulking the side end portion, the positioning is fixed to the hub 12 while being sandwiched between the stepped portion 12s of the hub 12 and the caulking portion 12d. As a result, a predetermined preload is applied to the inner ring structure 16 (and consequently the bearing unit (hub unit bearing) A).
In place of such caulking and fixing, for example, the inner ring component 16 is press-fitted and fitted to the step portion 12s of the hub 12, and then tightened with a fastening member such as a nut from the inboard side or the outboard side. It is also possible to fix to the inboard side of the hub 12. FIG. 1 also shows the configuration of the rotating wheel 4 provided with only one inner ring component 16 and disposed on the inboard side of the hub 12 (for example, fixed by crimping after press-fitting). However, two inner ring structural bodies are provided, and raceway grooves 4t and 4s facing the raceway grooves 2t and 2s of the stationary ring 2 are formed in these inner ring structural bodies, respectively. It is also possible to adopt a configuration of rotating wheels fixed to the side and the outboard side, respectively.

ハブ１２には、その外周部のアウトボード側に車輪構成部材である制動装置のロータ(ブレーキロータ)(図示しない)を固定するためのフランジ部(以下、ハブフランジという)１２ｆが周方向に沿って連続して突設されている。ハブフランジ１２ｆは、静止輪２を越えて外方(ハブ１２の径方向外側)に向かって延出しており、その延出縁付近には、周方向に沿って複数(一例として、５つ)の貫通孔(ボルト孔)１２ｈが設けられている。一方、図示しないブレーキロータ及びディスクホイールにも、フランジボルト孔１２ｈと連通可能な貫通孔(以下、ロータボルト孔、ホイールボルト孔という)が周方向に沿って複数個(一例として、ボルト孔１２ｈと同数個)設けられている。なお、フランジボルト孔１２ｈ、ロータボルト孔及びホイールボルト孔は、いずれも挿通されるハブボルト１４のボルト径(直径)と略同一の孔径(直径)で穿孔されている。そして、ハブボルト１４をフランジボルト孔１２ｈからロータボルト孔、ホイールボルト孔へ挿通し、ハブナット(図示しない)で締結することにより、前記ブレーキロータ及びディスクホイールをハブフランジ１２ｆに対して位置決めして固定することができる。   The hub 12 has a flange portion (hereinafter referred to as a hub flange) 12f for fixing a rotor (brake rotor) (not shown) of a braking device, which is a wheel component member, on the outboard side of the outer peripheral portion along the circumferential direction. Projecting continuously. The hub flange 12f extends outward (outward in the radial direction of the hub 12) beyond the stationary ring 2, and there are a plurality of (for example, five) along the circumferential direction in the vicinity of the extended edge. Through-holes (bolt holes) 12h are provided. On the other hand, a brake rotor and a disc wheel (not shown) also have a plurality of through holes (hereinafter referred to as rotor bolt holes and wheel bolt holes) that can communicate with the flange bolt holes 12h along the circumferential direction (for example, bolt holes 12h and The same number). The flange bolt hole 12h, the rotor bolt hole, and the wheel bolt hole are all drilled with a hole diameter (diameter) substantially the same as the bolt diameter (diameter) of the hub bolt 14 to be inserted. Then, the brake rotor and the disc wheel are positioned and fixed with respect to the hub flange 12f by inserting the hub bolt 14 from the flange bolt hole 12h into the rotor bolt hole and the wheel bolt hole and fastening with the hub nut (not shown). be able to.

ここで、軸受ユニット(ハブユニット軸受)の型式(タイプ)は図１に示すような構成には限定されず、例えば、回転輪４(ハブ１２)のフランジ１２ｆの有無や数、静止輪２のフランジ２ｆの有無や数、あるいは内輪構成体１６の有無、及び転動体１８の種類(玉や各種のころ)などは、いずれも軸受ユニットの使用条件や使用目的などに応じて任意に設定することが可能である。
また、図１に示す構成においては、外方側軌道輪を静止輪２、内方側軌道輪を回転輪４(ハブ１２及び内輪構成体１６)としているが、これとは逆に外方軌道輪を回転輪、内方軌道輪を静止輪とした構成の軸受ユニットとすることも可能である。
さらに、ハブ１２及び内輪構成体１６の位置決め固定は、上述したような加締などの他、軸受ユニットの型式(タイプ)に応じて異なる方法を採用することができる。例えば、軸受ユニットが自動車の駆動輪を回転支持するハブユニット軸受の場合、内輪構成体１６をハブ１２に形成された段部１２ｓまで外嵌した後、等速ジョイントのスプライン軸(図示しない)をハブ１２のスプライン孔(図示しない)にインボード側からアウトボード側へ向けて圧入し、挿通する。そして、前記スプライン軸の延出方向先端部に設けられた雄ねじ部へＣＶＪナット(図示しない)を螺合させ、当該ＣＶＪナットがハブ１２のＣＶＪナット座面と当接するように締結することで、ハブ１２と前記スプライン軸とを位置決め固定することができる。その際、内輪構成体１６は、その一端面(インボード側の端面)が前記等速ジョイントの突き当て面(前記スプライン軸の延出方向終端部を拡径させてなる面部)に当接し、当該等速ジョイントの突き当て面とハブ１２の段部１２ｓとの間で挟み込まれることで位置決め固定される。このように内輪構成体１６を位置決め固定することで、ハブユニット軸受に対して所定の予圧を付与することができる。
いずれの軸受ユニットにおいても、回転輪は、車輪構成部材(例えば、ディスクホイール及びブレーキロータ)が固定されて当該車輪構成部材とともに回転するのに対し、静止輪は、車体構成部材(例えば、懸架装置のナックル)に固定されて静止状態に維持される。 Here, the type (type) of the bearing unit (hub unit bearing) is not limited to the configuration shown in FIG. 1. For example, the presence and number of flanges 12 f of the rotating wheel 4 (hub 12), the number of stationary wheels 2, and the like. The presence / absence and number of flanges 2f or the presence / absence of inner ring component 16 and the type of rolling element 18 (balls and various rollers) are all set according to the use conditions and purpose of the bearing unit. Is possible.
In the configuration shown in FIG. 1, the outer raceway is a stationary ring 2 and the inner raceway is a rotating wheel 4 (hub 12 and inner ring component 16). It is also possible to provide a bearing unit having a configuration in which the ring is a rotating ring and the inner race is a stationary ring.
Further, for the positioning and fixing of the hub 12 and the inner ring component 16, different methods can be adopted depending on the type of the bearing unit in addition to the caulking as described above. For example, in the case where the bearing unit is a hub unit bearing that rotatably supports a driving wheel of an automobile, after the inner ring structure 16 is externally fitted to the step portion 12s formed on the hub 12, a spline shaft (not shown) of a constant velocity joint is used. The hub 12 is press-fitted into a spline hole (not shown) from the inboard side to the outboard side and inserted. Then, a CVJ nut (not shown) is screwed into a male screw portion provided at the front end portion of the spline shaft in the extending direction, and the CVJ nut is fastened so as to come into contact with the CVJ nut seating surface of the hub 12, The hub 12 and the spline shaft can be positioned and fixed. At that time, the inner ring constituting body 16 abuts one end surface (end surface on the inboard side) of the abutting surface of the constant velocity joint (surface portion formed by expanding the end portion in the extending direction of the spline shaft), The positioning is fixed by being sandwiched between the abutting surface of the constant velocity joint and the step portion 12 s of the hub 12. By positioning and fixing the inner ring component 16 in this way, a predetermined preload can be applied to the hub unit bearing.
In any bearing unit, the rotating wheel is fixed to a wheel component (for example, a disc wheel and a brake rotor) and rotates together with the wheel component, while the stationary wheel is a vehicle body component (for example, a suspension device). It is fixed to the knuckle) and is kept stationary.

本実施形態において、ハブユニット軸受Ａには、回転輪４の回転状態を検出するセンサが備えられており、当該センサは、回転輪４に固定され、当該回転輪４と同一回転状態で回転する被検出体４０と、当該被検出体４０と所定間隔で対向して所定の静止部位(例えば、静止輪２や後述するキャップ２６など)に固定され、当該被検出体４０の回転状態を回転輪４の回転状態として検出する検出体(図示しない)で構成されている。
なお、センサとしては、例えば、磁気状態の変化(一例として、磁束密度の変化)を検知する磁気センサ、及び照射光に対する反射光を検知する光学センサなどを用いることができるが、本実施形態においては、センサが磁気センサである場合を一例として想定する。また、軸受ユニット(ハブユニット軸受)に設けるセンサの数は、１つだけであってもよいし、２つ以上であってもよく、軸受ユニット(ハブユニット軸受)の使用条件や使用目的などに応じて任意に設定すればよい。なお、センサを２つ以上設けた構成とする場合、各センサは、回転輪４の回転方向に対して所定の位相差を有するように配設すればよい。 In the present embodiment, the hub unit bearing A is provided with a sensor that detects the rotational state of the rotating wheel 4. The sensor is fixed to the rotating wheel 4 and rotates in the same rotational state as the rotating wheel 4. The detection object 40 is fixed to a predetermined stationary part (for example, the stationary wheel 2 or a cap 26 described later) facing the detection object 40 at a predetermined interval, and the rotation state of the detection object 40 is a rotating wheel. 4 is configured by a detection body (not shown) that is detected as a rotational state.
As the sensor, for example, a magnetic sensor that detects a change in magnetic state (for example, a change in magnetic flux density), an optical sensor that detects reflected light with respect to irradiation light, and the like can be used. Suppose that the sensor is a magnetic sensor as an example. Further, the number of sensors provided in the bearing unit (hub unit bearing) may be only one, or may be two or more, depending on the use conditions and purpose of use of the bearing unit (hub unit bearing). Any setting may be made accordingly. When two or more sensors are provided, each sensor may be disposed so as to have a predetermined phase difference with respect to the rotation direction of the rotating wheel 4.

検出体(例えば、ホールＩＣなど)は、被検出体(例えば、多極磁石エンコーダ(センサロータ))４０の回転状態(回転速度、回転角度及び回転方向など)を示す信号(検出信号)を車体側の図示しない信号処理部(例えば、ＡＢＳ(Antilock Brake System)の制御器など)へ所定の接続部材(例えば、ハーネスやコネクタなど)を介して与える。そして、信号処理部は、検出体(図示しない)が検出した前記検出信号を前記接続部材を介して受信し、単位時間当たりの被検出体４０の位置や角度などの変動量の演算処理を行う。これにより、例えば、かかる被検出体と同一の回転状態で回転している回転輪４、すなわち車輪の回転速度、回転角度及び回転方向などの計測を行うことができる。   The detection body (for example, Hall IC) receives a signal (detection signal) indicating the rotation state (rotation speed, rotation angle, rotation direction, etc.) of the detection target body (for example, a multipole magnet encoder (sensor rotor)) 40. The signal is supplied to a signal processing unit (not shown) (for example, an ABS (Antilock Brake System) controller) via a predetermined connection member (for example, a harness or a connector). Then, the signal processing unit receives the detection signal detected by a detection body (not shown) via the connection member, and performs a calculation process of a variation amount such as a position and an angle of the detection target 40 per unit time. . Thereby, for example, it is possible to measure the rotating wheel 4 rotating in the same rotation state as the detected object, that is, the rotation speed, rotation angle, and rotation direction of the wheel.

なお、図１に示す構成において、被検出体(センサロータ)４０は、環状の平板をなしており、その磁極部４０ａが前記検出体(図示しない)と対向可能となるように、所定の保持部材４２を介して回転輪４(具体的には、内輪構成体１６)に固定され、当該回転輪４(内輪構成体１６)と同一の回転状態で回転する。被検出体４０の磁極部４０ａは、前記検出体(図示しない)と対向する環状平面に設けられており、例えば、磁性材として磁性ゴム(いわゆるボンド磁石)やプラスチック磁石を適用し、これらを環状に成形してＮ極とＳ極とが周方向へ交互に連続して並ぶように着磁させた構成としてもよいし、多数の板状の永久磁石をＮ極とＳ極とが周方向へ交互に連続して並ぶように環状に配設した構成であってもよい。また、磁極部(エンコーダ面)は磁性材に窓明けしたものや、櫛形に成形したものであってもよく、要は周方向に磁気特性が連続的に変化するものであればよい。
保持部材４２は、軸方向(図１の左右方向)に延出された円筒部(保持部材円筒部)４２ａと、そのインボード側の延出端に連続して縮径方向へ延出する円板部(保持部材円板部)４２ｂで構成されており、円板部４２ｂに被検出体４０を固定し、当該被検出体４０の磁極部４０ａが前記検出体(図示しない)と対向可能となるように、円筒部４２ａを内輪構成体１６の溝肩部１６ａに固定することで位置決めされている。なお、図１に示す構成においては、円筒部４２ａを内輪構成体１６の溝肩部１６ａに固定した状態で、円板部４２ｂに固定された被検出体４０が回転輪４(具体的には、ハブ１２)のインボード側端部よりも突出するように配されている。また、保持部材４２は、センサの被検出体４０を回転輪４(内輪構成体１６)と同一の回転状態でスムーズに回転させることが可能であれば、その構成は特に限定されない。例えば、図６から図１３では、保持部材４２の円板部４２ｂを、円筒部４２ａのインボード側の延出端に連続して拡径方向へ延出した後、縮径方向へ折り返した構成としている。 In the configuration shown in FIG. 1, the object to be detected (sensor rotor) 40 has an annular flat plate, and a predetermined holding is performed so that the magnetic pole portion 40a can face the detection body (not shown). It is fixed to the rotating wheel 4 (specifically, the inner ring component 16) via the member 42, and rotates in the same rotational state as the rotating wheel 4 (inner ring component 16). The magnetic pole part 40a of the detection object 40 is provided on an annular plane facing the detection object (not shown). For example, a magnetic rubber (so-called bond magnet) or a plastic magnet is applied as a magnetic material, and these are annular. The N pole and the S pole may be magnetized so that the N pole and the S pole are alternately arranged in the circumferential direction, or a large number of plate-like permanent magnets may be arranged in the circumferential direction. It may be configured to be arranged in an annular shape so as to be alternately and continuously arranged. In addition, the magnetic pole part (encoder surface) may be a window made of a magnetic material or a comb-shaped part, and any magnetic part may be used as long as the magnetic characteristics continuously change in the circumferential direction.
The holding member 42 includes a cylindrical portion (holding member cylindrical portion) 42a extending in the axial direction (left-right direction in FIG. 1), and a circle extending in the reduced diameter direction continuously from the extending end on the inboard side. It is composed of a plate part (holding member disk part) 42b, and the detection object 40 is fixed to the disk part 42b, and the magnetic pole part 40a of the detection object 40 can oppose the detection object (not shown). Thus, the cylindrical portion 42 a is positioned by being fixed to the groove shoulder portion 16 a of the inner ring component 16. In the configuration shown in FIG. 1, the detected body 40 fixed to the disk portion 42 b is connected to the rotating wheel 4 (specifically, the cylindrical portion 42 a is fixed to the groove shoulder portion 16 a of the inner ring structure 16. The hub 12) is arranged so as to protrude from the end portion on the inboard side. Further, the configuration of the holding member 42 is not particularly limited as long as the detection target body 40 of the sensor can be smoothly rotated in the same rotational state as the rotating wheel 4 (inner ring constituent body 16). For example, in FIG. 6 to FIG. 13, the disc portion 42b of the holding member 42 is extended in the diameter-expanding direction continuously from the extension end on the inboard side of the cylindrical portion 42a, and then folded back in the diameter-decreasing direction. It is said.

そして、ハブユニット軸受Ａには、ユニットの内部を外部から封止して密封状態(気密状態、及び液密状態)に保つための密封装置(密封シール及びキャップ)が設けられており、これにより、ユニット外部から異物(例えば、泥水や塵埃など)が内部に侵入することを防止しているとともに、ユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)が外部へ漏洩することを防止している。
一例として、図１に示す構成においては、ハブユニット軸受Ａのアウトボード側に接触型のシール(鋼板製の芯金の全体若しくは一部を各種の弾性材で連結して成る多リップシール)２４を設けているのに対し、インボード側にはハブユニット軸受Ａのインボード側端部の略全体(静止輪２及び回転輪４(ハブ１２と内輪構成体１６)で囲まれた空間を含む)を覆って閉塞する静止構造をなすキャップ２６(底部を有する略円筒状のカバー部材)を設けており、これらのシール２４及びキャップ２６を設けることで、ユニット内部の密封性(気密性及び液密性)を保っている。なお、密封装置は、ハブユニット軸受Ａの種類、使用目的や使用条件などに応じて要求される密封性(気密性や液密性)のレベルに応じ、上記に代えて、もしくは加えて、非接触型のシールやシールド(例えば、ステンレス板、鉄板等の薄い金属板を曲げ加工して成形されたシールド等)、あるいはスリンガ、芯金及びシール部材を組み合わせた構造を成すパッケージ型のシール(いわゆるパックシールという)などを任意に選択して使用することも可能である。 The hub unit bearing A is provided with a sealing device (sealing seal and cap) for sealing the inside of the unit from the outside to keep it sealed (airtight and liquid-tight). This prevents foreign matter (e.g., muddy water and dust) from entering the unit from the outside and prevents lubricant (e.g. grease and lubricating oil) enclosed inside the unit from leaking to the outside. It is preventing.
As an example, in the configuration shown in FIG. 1, a contact-type seal (a multi-lip seal formed by connecting a whole or a part of a steel cored bar with various elastic materials) on the outboard side of the hub unit bearing A 24. In contrast, the inboard side includes a space surrounded by substantially the entire inboard side end portion of the hub unit bearing A (the stationary wheel 2 and the rotating wheel 4 (the hub 12 and the inner ring component 16)). ) And a cap 26 (substantially cylindrical cover member having a bottom portion) is provided. The seal 24 and the cap 26 are provided to seal the inside of the unit (airtightness and liquid). (Tightness) is maintained. The sealing device may be replaced with or in addition to the above according to the level of sealing (airtightness or liquidtightness) required depending on the type of hub unit bearing A, the purpose of use, the usage conditions, etc. Contact-type seals and shields (for example, shields formed by bending thin metal plates such as stainless steel plates and iron plates), or package-type seals that have a structure that combines a slinger, a core metal, and a seal member (so-called It is also possible to arbitrarily select and use a pack seal).

本実施形態においては、上記密封装置のうち、特にキャップ２６の密封性能を高めるべく、キャップ２６の軌道輪(具体的には、静止輪２)に対する固定構造(同、嵌合構造)の改良を図ることで、キャップ２６の静止輪２に対する密着性を高め、かかる静止輪２からの脱落防止や当該静止輪２に対する静止安定性の向上を図るとともに、嵌合部分からの異物(例えば、泥水や塵埃など)の侵入、及びユニット内部に封入された潤滑剤(同、グリースや潤滑油など)の外部への漏洩の防止を図ることを可能としている。以下、このような作用効果を奏するキャップ２６の具体的構成について説明する。
キャップ２６は、ハブユニット軸受Ａのインボード側端部の略全体(静止輪２及び回転輪４(ハブ１２と内輪構成体１６)で囲まれた空間を含む)を覆う略円板状の底部２６ａと、当該底部２６ａの周縁部に連続して成形され、静止輪２へ固定するための固定部２６ｂとを備えている。なお、以下に説明する実施形態(第１実施形態から第８実施形態)において、キャップ２６の基本的な構成は共通しているため、各実施形態において同一もしくは類似する構成部材については図面上で同一符号を付すことで重複説明を省略し、それぞれの実施形態に特有の構成について詳述する。 In the present embodiment, in order to improve the sealing performance of the cap 26 among the above-described sealing devices, the fixing structure (the same fitting structure) of the cap 26 with respect to the race ring (specifically, the stationary ring 2) is improved. As a result, the adhesion of the cap 26 to the stationary wheel 2 is improved, the falling off of the stationary wheel 2 is prevented and the stationary stability with respect to the stationary wheel 2 is improved, and foreign matter (for example, muddy water or It is possible to prevent intrusion of dust and the like and leakage of lubricant (such as grease and lubricating oil) enclosed in the unit to the outside. Hereinafter, a specific configuration of the cap 26 that exhibits such operational effects will be described.
The cap 26 is a substantially disk-shaped bottom portion that covers substantially the entire inboard side end portion of the hub unit bearing A (including the space surrounded by the stationary wheel 2 and the rotating wheel 4 (the hub 12 and the inner ring component 16)). 26 a and a fixing portion 26 b that is continuously formed on the peripheral edge of the bottom portion 26 a and is fixed to the stationary wheel 2. In the embodiments described below (first to eighth embodiments), the basic configuration of the cap 26 is common, and therefore the same or similar components in each embodiment are illustrated on the drawings. A duplicate description will be omitted by giving the same reference numerals, and a configuration specific to each embodiment will be described in detail.

(第１実施形態)
本実施形態に係るキャップ２６の構成を図２及び図３に示す。かかる構成において、底部２６ａ及び固定部２６ｂは、所定の金属板をプレス加工することにより一体成形されている。金属板としては、鋼板(例えば、ＳＥＣＣ(電気亜鉛めっき鋼板))やステンレス板などを適例として想定可能であるが、これらには特に限定されない。ただし、ある程度の耐食性を有する非磁性材であることが望ましい。
底部２６ａは、その径(外径)が静止輪２のインボード側端部の円筒部位２ｐの外径寸法と略同寸に設定された板状をなしている。その際、底部２６ａの形状は、図２及び図３(ａ),(ｂ)に示すような平坦状であってもよいし、図３(ｃ),(ｄ)に示すように、周縁部が中心部に対してアウトボード側へ突出した(換言すれば、中心部が周縁部に対してインボード側へ突出した)段差構造をなしていてもよい。例えば、キャップ２６(底部２６ａ)をステンレス板で成形する場合、ステンレス板のプレス成形性はＳＥＣＣのような鋼板と比較して劣るため、図３(ｃ),(ｄ)に示すような段差構造とし(以下、当該段差部位を段差部２６ｄという)、センサの被検出体(センサロータ)４０との対向面を張り出させた構造とすることが好ましい。ただし、ハブユニット軸受がセンサを具備していない場合であっても、例えば、回転輪４や静止輪２のインボード側端部の構成(寸法)などに応じて、キャップ２６の底部２６ａを同様の段差構造(張り出し構造)とすることは問題ない。 (First embodiment)
The configuration of the cap 26 according to this embodiment is shown in FIGS. In such a configuration, the bottom portion 26a and the fixed portion 26b are integrally formed by pressing a predetermined metal plate. As the metal plate, a steel plate (for example, SECC (electrogalvanized steel plate)) or a stainless steel plate can be assumed as a suitable example, but is not particularly limited thereto. However, a nonmagnetic material having a certain degree of corrosion resistance is desirable.
The bottom portion 26a has a plate shape whose diameter (outer diameter) is set to be approximately the same as the outer diameter size of the cylindrical portion 2p at the inboard side end of the stationary wheel 2. At that time, the shape of the bottom portion 26a may be flat as shown in FIGS. 2 and 3A, 3B, or as shown in FIGS. 3C and 3D. May have a step structure that protrudes toward the outboard with respect to the center (in other words, the center protrudes toward the inboard with respect to the peripheral edge). For example, when the cap 26 (bottom portion 26a) is formed of a stainless steel plate, the press formability of the stainless steel plate is inferior to that of a steel plate such as SECC. Therefore, the step structure as shown in FIGS. (Hereinafter, the stepped portion is referred to as a stepped portion 26d), and it is preferable to have a structure in which the facing surface of the sensor to be detected (sensor rotor) 40 is projected. However, even if the hub unit bearing does not include a sensor, the bottom 26a of the cap 26 is similarly used depending on the configuration (dimensions) of the inboard side end of the rotating wheel 4 or stationary wheel 2, for example. There is no problem with a step structure (overhang structure).

固定部２６ｂは、底部２６ａの周縁部に凸曲状(いわゆるＲ状)に連続し、かつ静止輪２の円筒部位２ｐの肉厚分に相当する寸法だけ縮径方向へ折り返した後(以下、当該部位を折り返し部２６ｃという)、当該円筒部位２ｐの内周部に沿うように所定の角度(一例として、略９０°)をなしてアウトボード側へ所定の長さ(かかる円筒部位２ｐの内周部と十分に当接可能で、かつ転動体１８と干渉することのない長さ)で延出している。図２及び図３には、アウトボード側への延出部位の外径が静止輪２の円筒部位２ｐの内径寸法と略同寸に設定された円筒状に成形した固定部２６ｂの構成を示している。なお、その成形時には、折り返し部２６ｃが底部２６ａと確実に当接するように、底部２６ａをインボード側から押圧するとともに、折り返し部２６ｃをアウトボード側から押圧し、底部２６ａ及び折り返し部２６ｃに十分な押圧力を付加しておくことが望ましい(図３(ａ)から(ｃ)参照)。
このように、キャップ２６は、底部２６ａ(段差部２６ｄを含む)から折り返し部２６ｃを経て固定部２６ｂに到る、全体が略カップ状をなすように構成されている(折り返し部２６ｃは、径方向への折り返し)。 The fixed portion 26b is convexly curved (so-called R-shaped) at the peripheral edge of the bottom portion 26a, and after being folded back in the reduced diameter direction by a dimension corresponding to the thickness of the cylindrical portion 2p of the stationary ring 2 (hereinafter, The portion is referred to as a folded portion 26c), and a predetermined length (approximately 90 ° as an example) along the inner peripheral portion of the cylindrical portion 2p toward the outboard side (within the cylindrical portion 2p). The length extends so as to sufficiently contact the peripheral portion and does not interfere with the rolling element 18). 2 and 3 show the configuration of the fixed portion 26b formed into a cylindrical shape in which the outer diameter of the portion extending to the outboard side is set to be approximately the same as the inner diameter of the cylindrical portion 2p of the stationary ring 2. ing. At the time of molding, the bottom 26a is pressed from the inboard side and the folded portion 26c is pressed from the outboard side so that the folded portion 26c is surely brought into contact with the bottom portion 26a. It is desirable to apply an appropriate pressing force (see FIGS. 3A to 3C).
In this way, the cap 26 is configured to be substantially cup-shaped from the bottom portion 26a (including the stepped portion 26d) to the fixing portion 26b via the folded portion 26c (the folded portion 26c has a diameter). Wrap in direction).

キャップ２６には、その外周部に対し、静止輪２の円筒部位２ｐ(すなわち固定部位)との間に介在されるように、弾性体(ゴムなどの弾性材でなる成形体)２８が連結されている。キャップ２６と弾性体２８との連結は、加硫による場合を一例として想定するが、キャップ２６及び弾性体２８の材質などに応じて、例えば、接着、かしめ、コーティング、射出成形などの各種方法を任意に選択して行うことも可能である。
図２及び図３には、弾性体２８の構成の一例をそれぞれ示している。図２及び図３(ａ)に示す構成においては、底部２６ａと折り返し部２６ｃとの連続部位、すなわち、凸曲状(Ｒ状)をなすキャップ周縁部のインボード側からアウトボード側に到るまでのキャップ２６の表面領域に対し、全周に亘ってゴム製の弾性体２８が連結(加硫成形)されている(以下、かかる弾性体２８が連結されたキャップ２６の部位を折り返しＲ部という)。なお、図２には、キャップ２６をハブユニット軸受Ａに対して装着した状態を示し、図３(ａ)には、当該キャップ２６のハブユニット軸受Ａに対する装着前の状態(キャップ２６単体の概略構成)を示している。 An elastic body (a molded body made of an elastic material such as rubber) 28 is coupled to the outer periphery of the cap 26 so as to be interposed between the cylindrical portion 2p (that is, the fixed portion) of the stationary ring 2. ing. The connection between the cap 26 and the elastic body 28 is assumed as an example by vulcanization, but depending on the material of the cap 26 and the elastic body 28, various methods such as adhesion, caulking, coating, injection molding and the like can be used. It is also possible to select arbitrarily.
2 and 3 show examples of the configuration of the elastic body 28, respectively. In the configuration shown in FIGS. 2 and 3 (a), the continuous portion of the bottom portion 26a and the folded portion 26c, that is, the inboard side of the peripheral edge portion of the cap having a convex curved shape (R shape) reaches the outboard side. A rubber elastic body 28 is connected (vulcanized) over the entire circumference of the surface area of the cap 26 (hereinafter, the portion of the cap 26 to which the elastic body 28 is connected is folded back into the R portion). Called). 2 shows a state in which the cap 26 is attached to the hub unit bearing A, and FIG. 3A shows a state before the cap 26 is attached to the hub unit bearing A (an outline of the cap 26 alone). Configuration).

この場合、弾性体２８は、キャップ２６(底部２６ａ及び折り返し部２６ｃ)の表面と面一となるように連続しているが、その一方で、当該弾性体２８のアウトボード側(折り返しＲ部のアウトボード側のＲ部分に相当する部位)に、全周に亘って所定高さで凸状に連続して突出する突条２８ｂを有している。このように、弾性体２８を折り返しＲ部のみを被覆するに止めた構成とすることで、底部２６ａをインボード側から押圧するとともに、折り返し部２６ｃをアウトボード側から押圧し、これら底部２６ａ及び折り返し部２６ｃに十分な押圧力を付加することが可能となる。これにより、底部２６ａと折り返し部２６ｃを強固に当接させ、底部２６ａ及び折り返し部２６ｃの各平面部分へのゴム流れをいずれも確実に防止することができる。   In this case, the elastic body 28 is continuous so as to be flush with the surface of the cap 26 (the bottom portion 26a and the folded portion 26c), but on the other hand, on the outboard side of the elastic body 28 (of the folded R portion). On the outboard side, a portion corresponding to the R portion) has a protrusion 28b that continuously protrudes in a convex shape at a predetermined height over the entire circumference. In this way, by setting the elastic body 28 so as to cover only the folded R portion, the bottom portion 26a is pressed from the inboard side, and the folded portion 26c is pressed from the outboard side. It becomes possible to apply a sufficient pressing force to the folded portion 26c. Thereby, the bottom part 26a and the folding | returning part 26c can be firmly contact | abutted, and it can prevent reliably the rubber flow to each plane part of the bottom part 26a and the folding | returning part 26c.

なお、図２及び図３(ａ)に示す構成において、弾性体２８のインボード側は、凸曲状(Ｒ状)をなすキャップ周縁部のインボード側(すなわち、折り返しＲ部のインボード側のＲ部分に相当する部位)のみを被覆するに止めているが、例えば、ハブユニット軸受がセンサ(被検出体４０)を具備していない場合、図３(ｂ)に示すように、底部２６ａのインボード側の表面領域全体を弾性材で被覆するように弾性体２８を構成してもよい。これにより、キャップ２６の耐食性を高めることができるため、安価でプレス加工のし易いＳＥＣＣのような鋼板でキャップ２６を製造することも可能となる。この場合、弾性体２８のインボード側には、全周に亘って連続して凹状に窪んだ溝部２８ａを形成する。これにより、底部２６ａをインボード側から押圧するとともに、折り返し部２６ｃをアウトボード側から押圧することで、底部２６ａと折り返し部２６ｃを強固に当接させることができ、折り返し部２６ｃの平面部分へのゴム流れを確実に防止することができる。   In the configuration shown in FIGS. 2 and 3A, the inboard side of the elastic body 28 is the inboard side of the peripheral edge of the cap having a convex curved shape (R shape) (that is, the inboard side of the folded R portion). In the case where the hub unit bearing does not include a sensor (detected body 40), for example, as shown in FIG. 3B, the bottom 26a is covered. The elastic body 28 may be configured to cover the entire surface area on the inboard side with an elastic material. Thereby, since the corrosion resistance of the cap 26 can be improved, it is also possible to manufacture the cap 26 with a steel plate such as SECC which is inexpensive and easy to press. In this case, on the inboard side of the elastic body 28, a groove portion 28a that is continuously concaved over the entire circumference is formed. Thereby, while pressing the bottom part 26a from the inboard side and pressing the folded part 26c from the outboard side, the bottom part 26a and the folded part 26c can be firmly brought into contact with each other. The rubber flow can be reliably prevented.

また、キャップ２６の底部２６ａを図３(ｃ),(ｄ)に示すような段差構造(張り出し構造)とした場合、弾性体２８のインボード側は、段差部２６ｄの段差(底部２６ａのインボード側の周縁近傍)を埋設するように成形されており、同図(ｃ)に示す構成では、かかる埋設部位に全周に亘って連続して凹状に窪んだ溝部２８ａが形成されている。すなわち、キャップ２６は、底部２６ａのインボード側の周縁近傍に溝部２８ａを有するとともに、折り返しＲ部のアウトボード側のＲ部分に突条２８ｂを有するよう、弾性体２８が成形された構成となっている。
なお、キャップ２６は、例えば、ハブユニット軸受がセンサを具備していなくとも、回転輪４や静止輪２のインボード側端部の構成(寸法)などの制約により、底部２６ａを段差構造(張り出し構造)とする場合がある。この場合、弾性体２８を段差部２６ｄの段差(底部２６ａのインボード側の周縁近傍)を埋設する構成とはせず、図２及び図３(ａ)に示すような折り返しＲ部のみを被覆するに止めた構成とすることも可能であるが、段差部２６ｄの段差を弾性体２８で埋設した構成(別の捉え方をすれば、キャップ２６の周縁部を円筒状とした構成)とすることで、ハブユニット軸受Ａに対する装着時(圧入時)に当該軸受との芯合わせの容易化を図ることが可能となる。その際には、弾性体２８を図３(ｃ)に示すような溝部２８ａを有する構成とし、底部２６ａをインボード側から押圧するとともに、折り返し部２６ｃをアウトボード側から押圧することで、底部２６ａと折り返し部２６ｃを強固に当接させ、折り返し部２６ｃの平面部分へのゴム流れを確実に防止することが望ましい。
また、本実施形態のようにハブユニット軸受Ａがセンサを具備している場合には、センサの検出体(図示しない)と被検出体(センサロータ)４０との対向間隔(エアギャップ)の拡大を回避させるべく、被検出体(センサロータ)４０と対向するキャップ２６の対向面(図２及び図３においては、底部２６ａのアウトボード側の表面)は、弾性体２８で被覆することなく、当該対向面を露出した状態とするとともに、かかるキャップ２６をステンレス板などの非磁性不錆材で構成する。 Further, when the bottom portion 26a of the cap 26 has a step structure (overhang structure) as shown in FIGS. 3C and 3D, the inboard side of the elastic body 28 has a step portion of the step portion 26d (the indent of the bottom portion 26a). In the configuration shown in FIG. 5C, a groove 28a that is continuously concaved over the entire circumference is formed in the embedded portion. That is, the cap 26 has a configuration in which the elastic body 28 is formed so as to have the groove portion 28a in the vicinity of the peripheral edge on the inboard side of the bottom portion 26a and the protrusion 28b in the R portion on the outboard side of the folded R portion. ing.
For example, even if the hub unit bearing does not have a sensor, the cap 26 has a stepped structure (overhang) due to restrictions on the configuration (dimensions) of the inboard side ends of the rotating wheel 4 and the stationary wheel 2. Structure). In this case, the elastic body 28 is not configured to bury the step of the step portion 26d (in the vicinity of the peripheral edge on the inboard side of the bottom portion 26a), and covers only the folded R portion as shown in FIG. 2 and FIG. However, it is possible to adopt a configuration in which the step of the step portion 26d is embedded with the elastic body 28 (in other words, a configuration in which the peripheral portion of the cap 26 is cylindrical). As a result, it is possible to facilitate centering with the bearing when the hub unit bearing A is mounted (press-fit). In that case, the elastic body 28 is configured to have a groove portion 28a as shown in FIG. 3C, and the bottom portion 26a is pressed from the inboard side, and the folded portion 26c is pressed from the outboard side, so that the bottom portion It is desirable to firmly abut 26a and the folded portion 26c to reliably prevent the rubber flow to the flat portion of the folded portion 26c.
Further, when the hub unit bearing A includes a sensor as in the present embodiment, the facing distance (air gap) between the sensor detection body (not shown) and the detection target body (sensor rotor) 40 is increased. In order to avoid this, the facing surface of the cap 26 (the surface on the outboard side of the bottom 26a in FIGS. 2 and 3) facing the object to be detected (sensor rotor) 40 is not covered with the elastic body 28. The facing surface is exposed, and the cap 26 is made of a nonmagnetic rust material such as a stainless steel plate.

このような構成をなすキャップ２６をハブユニット軸受Ａに対して装着する際には、ハブユニット軸受Ａのインボード側端部を底部２６ａで覆うように、固定部２６ｂの先端を静止輪２の円筒部位２ｐのインボード側へ向けて位置付ける。次に、固定部２６ｂの外周部を円筒部位２ｐの内周部に沿わせるように、底部２６ａに所定の押圧力を加えつつ、キャップ２６をアウトボード側へ向けて圧入していく。そして、弾性体２８の突条２８ｂが円筒部位２ｐの端面２ｂに当接し、つぶれるように弾性変形され、折り返し部２６ｃが弾性体２８を介して円筒部位２ｐの端面２ｂと密着するまでキャップ２６を圧入し、固定部２６ｂの外周部全体を円筒部位２ｐの内周部と嵌合させる。これにより、キャップ２６を静止輪２に対して位置決め固定することが可能となる。   When the cap 26 having such a configuration is attached to the hub unit bearing A, the tip of the fixed portion 26b is attached to the stationary ring 2 so that the inboard side end of the hub unit bearing A is covered with the bottom portion 26a. Position toward the inboard side of the cylindrical part 2p. Next, the cap 26 is press-fitted toward the outboard side while applying a predetermined pressing force to the bottom portion 26a so that the outer peripheral portion of the fixing portion 26b is along the inner peripheral portion of the cylindrical portion 2p. Then, the protrusion 26b of the elastic body 28 comes into contact with the end surface 2b of the cylindrical portion 2p and is elastically deformed so as to be crushed, and the cap 26 is held until the folded portion 26c comes into close contact with the end surface 2b of the cylindrical portion 2p via the elastic body 28. The entire outer peripheral portion of the fixing portion 26b is fitted with the inner peripheral portion of the cylindrical portion 2p. As a result, the cap 26 can be positioned and fixed with respect to the stationary wheel 2.

この時、弾性体２８の突条２８ｂが圧縮された(つぶれた)状態で円筒部位２ｐの端面２ｂと密着し、当該端面２ｂと折り返し部２６ｃとの間を閉塞しているため、キャップ２６と静止輪２との嵌合部分(固定部２６ｂと円筒部位２ｐとの嵌合部分)からの異物(例えば、泥水や塵埃など)の侵入を確実に防止することができるとともに、ユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩を確実に防止することができる。また、折り返し部２６ｃ(折り返しＲ部のアウトボード側のＲ部分)に弾性体２８の突条２８ｂを設けているため、当該突条２８ｂを介して円筒部位２ｐの端面２ｂと密着する折り返し部２６ｃの平面部分へのゴム流れを確実に防止することができ、キャップ２６の圧入位置精度を確保することができる。例えば、ハブユニット軸受Ａがセンサを具備しており、当該センサの検出体(図示しない)がキャップ２６に固定されている場合、キャップ２６の圧入位置精度は、かかるセンサの検出体と被検出体(センサロータ)４０との対向間隔(エアギャップ)に影響を及ぼし、センサの検知精度(出力信号の品質)を大きく左右する。したがって、キャップ２６の圧入位置精度を確保することで、キャップ２６の静止輪２に対する静止安定性を高めることができ、結果として、前記エアギャップを常に一定に保ち、センサの検知精度(出力信号の品質)を高めることが可能となる。また、静止輪２に対する静止安定性を高めることで、当該静止輪２からのキャップ２６の脱落防止を図ることができる。   At this time, the protrusion 28b of the elastic body 28 is in close contact with the end surface 2b of the cylindrical portion 2p in a compressed (collapsed) state and closes between the end surface 2b and the folded portion 26c. Intrusion of foreign matter (for example, muddy water, dust, etc.) from the fitting part with the stationary wheel 2 (fitting part between the fixed portion 26b and the cylindrical part 2p) can be reliably prevented and enclosed in the unit. It is possible to reliably prevent leakage of lubricant (for example, grease or lubricating oil) to the outside. In addition, since the protrusion 28b of the elastic body 28 is provided on the folded portion 26c (the R portion on the outboard side of the folded R portion), the folded portion 26c that comes into close contact with the end surface 2b of the cylindrical portion 2p via the projected stripe 28b. The rubber flow to the flat portion of the cap 26 can be reliably prevented, and the press-fitting position accuracy of the cap 26 can be ensured. For example, when the hub unit bearing A includes a sensor and a detection body (not shown) of the sensor is fixed to the cap 26, the press-fitting position accuracy of the cap 26 is such that the detection body of the sensor and the detection body. This affects the distance (air gap) facing the (sensor rotor) 40 and greatly affects the detection accuracy (quality of the output signal) of the sensor. Therefore, by ensuring the press-fitting position accuracy of the cap 26, the stationary stability of the cap 26 with respect to the stationary wheel 2 can be improved. As a result, the air gap is always kept constant, and the detection accuracy of the sensor (output signal Quality) can be improved. In addition, by increasing the stationary stability with respect to the stationary wheel 2, it is possible to prevent the cap 26 from falling off the stationary wheel 2.

(第２実施形態)
本実施形態に係るキャップ２６の構成を図４に示す。
本実施形態において、キャップ２６の底部２６ａは、その径(外径)が静止輪２の円筒部位２ｐの内径寸法よりも小寸で、かつ、被検出体４０及び保持部材４２の外径寸法よりも大寸に設定された板状をなしている。なお、底部２６ａの形状は、図４に示すような平坦状であってもよいし、周縁部が中心部に対してアウトボード側へ突出した(換言すれば、中心部が周縁部に対してインボード側へ突出した)段差構造をなしていてもよい(例えば、図３(ｃ),(ｄ)に示すような構成)。
固定部２６ｂは、底部２６ａの周縁部に連続し、所定の角度(一例として、略９０°)をなしてアウトボード側へ所定の長さ(転動体１８と干渉することのない長さ)で延出している。そして、その延出端から凸曲状(いわゆるＲ状)をなして拡径方向へ連続した後、静止輪２の円筒部位２ｐの内周部に沿うようにインボード側へ所定の長さ(かかる円筒部位２ｐの内周部と十分に当接可能な長さ)で折り返し(以下、底部２６ａとの連続部位からここまでの部位を折り返し部２６ｅという)、さらに、所定の角度(一例として、略９０°)で前記円筒部位２ｐの肉厚分に略相当する寸法だけ拡径方向へ連続して延出されている(以下、当該延出部を嵌合部２６ｆという)。なお、固定部２６ｂ(具体的には、その嵌合部２６ｆ)の外径側延出端部は、その肉厚のアウトボード側が全周に亘って縮径されて凹状に窪んだ状態(薄肉状態)となっている(以下、当該薄肉部位を薄肉部２６ｇという)。
このように、キャップ２６は、底部２６ａから略Ｕ字状(図４においては、Ｕ字を右方向へ９０°回転させた状態の形状に相当)の固定部２６ｂへ連続する、全体が略カップ状をなすように構成されている(折り返し部２６ｃは、軸方向への折り返し)。 (Second embodiment)
The configuration of the cap 26 according to this embodiment is shown in FIG.
In the present embodiment, the diameter (outer diameter) of the bottom portion 26 a of the cap 26 is smaller than the inner diameter dimension of the cylindrical portion 2 p of the stationary ring 2, and the outer diameter dimensions of the detected body 40 and the holding member 42. Is also a large plate. The shape of the bottom 26a may be a flat shape as shown in FIG. 4, or the peripheral edge protrudes toward the outboard side with respect to the central part (in other words, the central part is relative to the peripheral part. A step structure (projecting toward the inboard side) may be formed (for example, a configuration as shown in FIGS. 3C and 3D).
The fixed portion 26b is continuous with the peripheral edge portion of the bottom portion 26a, and forms a predetermined angle (as an example, approximately 90 °) to the outboard side at a predetermined length (a length that does not interfere with the rolling element 18). It is extended. And after making the convex-curve shape (what is called R shape) from the extension end and continuing in the diameter-expanding direction, predetermined length (in the inboard side) along the inner peripheral part of the cylindrical part 2p of the stationary ring 2 ( Folded at such a length that can sufficiently contact the inner peripheral portion of the cylindrical portion 2p (hereinafter, the portion from the continuous portion with the bottom portion 26a to this point is referred to as the turned-up portion 26e), and a predetermined angle (for example, (Approximately 90 °) is continuously extended in the diameter-enlarging direction by a dimension substantially corresponding to the thickness of the cylindrical portion 2p (hereinafter, the extension portion is referred to as a fitting portion 26f). In addition, the outer diameter side extending end portion of the fixing portion 26b (specifically, the fitting portion 26f) is in a state in which the wall thickness of the outboard side is reduced in diameter over the entire circumference and recessed in a concave shape (thin wall (Hereinafter, the thin portion is referred to as a thin portion 26g).
In this way, the cap 26 continues from the bottom 26a to the fixing portion 26b that is substantially U-shaped (corresponding to the shape of the U-shape rotated 90 ° clockwise) in FIG. (The folded portion 26c is folded in the axial direction).

キャップ２６には、その外周部に弾性体２８が連結されており、図４に示す構成においては、キャップ周縁部のインボード側からアウトボード側、具体的には、固定部２６ｂ(折り返し部２６ｅ及び嵌合部２６ｆ)のインボード側からその延出端(薄肉部２６ｇ)のアウトボード側へ到るまでのキャップ２６の表面領域に対し、全周に亘ってゴム製の弾性体２８が連結(加硫成形)されている。その際、弾性体２８は、固定部２６ｂの折り返し部２６ｅ、及び延出端の凹状部位(薄肉部２６ｇのアウトボード側)をそれぞれ埋設しつつ、前記表面領域を全周に亘って被覆するように成形されている。なお、折り返し部２６ｅを埋設せず、閉塞するに止めて弾性体２８を成形しても構わない。また、弾性体２８は、アウトボード側の外周縁(静止輪２の円筒部位２ｐの外周縁に形成された面取り部２ｃと対向する部位)に、全周に亘って所定高さで凸状に連続して突出する突条２８ｂを有している。   An elastic body 28 is connected to the outer peripheral portion of the cap 26. In the configuration shown in FIG. 4, the cap peripheral portion from the inboard side to the outboard side, specifically, the fixing portion 26b (the folded portion 26e). And an elastic body 28 made of rubber is connected to the entire surface area of the cap 26 from the inboard side of the fitting portion 26f) to the outboard side of the extended end (thin portion 26g). (Vulcanization molding) At that time, the elastic body 28 covers the entire surface region while burying the folded portion 26e of the fixing portion 26b and the concave portion of the extending end (outboard side of the thin portion 26g). It is molded into. Note that the elastic body 28 may be formed without burying the folded portion 26e and stopping the folded portion 26e. Further, the elastic body 28 has a convex shape with a predetermined height over the entire circumference on the outer peripheral edge on the outboard side (the part facing the chamfer 2c formed on the outer peripheral edge of the cylindrical part 2p of the stationary wheel 2). It has the protrusion 28b which protrudes continuously.

このような構成をなすキャップ２６をハブユニット軸受Ａに対して装着する際には、ハブユニット軸受Ａのインボード側端部を底部２６ａで覆うように、折り返し部２６ｅの先端(方向転換部位)を静止輪２の円筒部位２ｐのインボード側へ向けて位置付ける。次に、折り返し部２６ｅの外周部を円筒部位２ｐの内周部に沿わせるように、底部２６ａに所定の押圧力を加えつつ、キャップ２６をアウトボード側へ向けて圧入していく。そして、弾性体２８の突条２８ｂが円筒部位２ｐの面取り部２ｃに当接し、つぶれるように弾性変形され、嵌合部２６ｆが円筒部位２ｐの端面２ｂと密着するまでキャップ２６を圧入し、折り返し部２６ｅの外周部全体を円筒部位２ｐの内周部と嵌合させる。これにより、キャップ２６を静止輪２に対して位置決め固定することが可能となる。   When the cap 26 having such a configuration is attached to the hub unit bearing A, the tip (direction changing portion) of the folded portion 26e so that the inboard side end of the hub unit bearing A is covered with the bottom portion 26a. Is positioned toward the inboard side of the cylindrical portion 2p of the stationary ring 2. Next, the cap 26 is press-fitted toward the outboard side while applying a predetermined pressing force to the bottom portion 26a so that the outer peripheral portion of the folded portion 26e is along the inner peripheral portion of the cylindrical portion 2p. Then, the protrusion 28b of the elastic body 28 comes into contact with the chamfered portion 2c of the cylindrical portion 2p and is elastically deformed so as to be crushed, and the cap 26 is press-fitted until the fitting portion 26f comes into close contact with the end surface 2b of the cylindrical portion 2p. The entire outer peripheral portion of the portion 26e is fitted to the inner peripheral portion of the cylindrical portion 2p. As a result, the cap 26 can be positioned and fixed with respect to the stationary wheel 2.

この時、弾性体２８の突条２８ｂが圧縮された(つぶれた)状態で円筒部位２ｐの面取り部２ｃと密着するとともに、当該円筒部位２ｐの端面２ｂと薄肉部２６ｇの間に弾性体２８が介在され、嵌合部２６ｆと円筒部位２ｐの端面２ｂとの間を閉塞しているため、キャップ２６と静止輪２との嵌合部分(固定部２６ｂ(折り返し部２６ｅ及び嵌合部２６ｆ)と円筒部位２ｐとの嵌合部分)からの異物(例えば、泥水や塵埃など)の侵入を確実に防止することができるとともに、ユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩を確実に防止することができる。また、キャップ２６の圧入時に嵌合部２６ｆが円筒部位２ｐの端面２ｂに突き当てられるため、キャップ２６の圧入位置精度を高めることができるとともに、キャップ２６の静止輪２に対する静止安定性を高めることができる。   At this time, the protrusion 28b of the elastic body 28 is in close contact with the chamfered portion 2c of the cylindrical portion 2p in a compressed (collapsed) state, and the elastic body 28 is interposed between the end surface 2b of the cylindrical portion 2p and the thin portion 26g. Since it is interposed and closes between the fitting portion 26f and the end surface 2b of the cylindrical portion 2p, the fitting portion between the cap 26 and the stationary wheel 2 (fixing portion 26b (folded portion 26e and fitting portion 26f) and It is possible to reliably prevent foreign matter (for example, muddy water and dust) from entering from the fitting portion with the cylindrical portion 2p and to prevent the lubricant (for example, grease and lubricating oil) enclosed in the unit from entering. Leakage to the outside can be reliably prevented. Further, since the fitting portion 26f is abutted against the end surface 2b of the cylindrical portion 2p when the cap 26 is press-fitted, it is possible to improve the press-fitting position accuracy of the cap 26 and to improve the stationary stability of the cap 26 with respect to the stationary wheel 2. Can do.

本実施形態のように、固定部２６ｂを略Ｕ字状をなす構成(折り返し部２６ｅを設けた構成)とすることで、静止輪２(円筒部位２ｐ)との嵌合強度を維持しつつ、嵌合によるキャップ外径の収縮により、キャップ２６の底部２６ａが軸方向(図４の左右方向)へ変形することを効果的に防止することができる。換言すれば、嵌合によるキャップ外径の収縮がセンサの被検出体(センサロータ)４０との対向面ともなる底部２６ａに与える影響を低減させることができ、結果として、センサの検出体と被検出体４０との対向間隔(エアギャップ)を一定に保ち、センサの検知精度(出力信号の品質)を高めることを可能とする。   As in the present embodiment, the fixing portion 26b has a substantially U-shaped configuration (a configuration in which the folded portion 26e is provided), thereby maintaining the fitting strength with the stationary wheel 2 (cylindrical portion 2p), It is possible to effectively prevent the bottom portion 26a of the cap 26 from being deformed in the axial direction (left-right direction in FIG. 4) due to contraction of the cap outer diameter due to the fitting. In other words, the influence of the shrinkage of the outer diameter of the cap due to the fitting on the bottom portion 26a that also serves as a surface facing the detected object (sensor rotor) 40 of the sensor can be reduced. The facing distance (air gap) with respect to the detection body 40 can be kept constant, and the detection accuracy (quality of the output signal) of the sensor can be improved.

なお、折り返し部２６ｅを設けた場合、一旦、当該折り返し部２６ｅに浸水すると、いわゆる毛細管現象等により排水が促されず、長期に亘って留水状態となる虞があり、発錆や腐食を招く可能性も想定し得る。このため、本実施形態においては、折り返し部２６ｅを弾性体２８で埋設(もしくは閉塞)することで、折り返し部２６ｅへの浸水を確実に防止し、発錆や腐食を抑止し、キャップ２６の耐久性の向上を図っている。   When the folded portion 26e is provided, once the folded portion 26e is submerged, drainage is not promoted by a so-called capillary phenomenon or the like, and there is a possibility that the water will be retained for a long period of time, leading to rusting and corrosion. A possibility can also be envisaged. For this reason, in the present embodiment, the folded portion 26e is embedded (or closed) by the elastic body 28, thereby reliably preventing water from entering the folded portion 26e, suppressing rusting and corrosion, and durability of the cap 26. The improvement of the nature is aimed at.

また、本実施形態においては、図４に示すように、弾性体２８の突条２８ｂをアウトボード側の外周縁(静止輪２の円筒部位２ｐの外周縁に形成された面取り部２ｃと対向する部位)に設けた構成としているが、突条２８ｂの配設位置はこれに限定されない。例えば、図５に示す本実施形態の変形例のように、静止輪２の円筒部位２ｐに対し、端面２ｂを凹状に窪ませてなる溝部２ｄを全周に亘って連続して形成し、突条２８ｂを弾性体２８のアウトボード側の所定位置(溝部２ｄと対向する部位)に対し、全周に亘って所定高さで凸状に連続して突出する突条２８ｂを設けた構成としてもよい。   Moreover, in this embodiment, as shown in FIG. 4, the protrusion 28b of the elastic body 28 is opposed to the outer peripheral edge on the outboard side (the chamfered portion 2c formed on the outer peripheral edge of the cylindrical portion 2p of the stationary ring 2). However, the arrangement position of the protrusion 28b is not limited to this. For example, as in the modification of the present embodiment shown in FIG. 5, a groove portion 2d having a concave end surface 2b is formed continuously over the entire circumference of the cylindrical portion 2p of the stationary ring 2, The strip 28b may be provided with a projection 28b that protrudes continuously at a predetermined height over the entire circumference with respect to a predetermined position (a portion facing the groove 2d) on the outboard side of the elastic body 28. Good.

このような構成とすることで、キャップ２６をハブユニット軸受Ａへ装着させるために静止輪２に対して圧入した際、弾性体２８の突条２８ｂが円筒部位２ｐの溝部２ｄと係合して圧縮され(つぶれ)、当該溝部２ｄへ隙間なく食い込むように密着する。したがって、弾性体２８と円筒部位２ｐとの密着度を格段に高め、キャップ２６の嵌合部２６ｆと円筒部位２ｐの端面２ｂとの間を強力に閉塞することができる。これにより、キャップ２６と静止輪２との嵌合部分(固定部２６ｂ(折り返し部２６ｅ及び嵌合部２６ｆ)と円筒部位２ｐとの嵌合部分)からの異物(例えば、泥水や塵埃など)の侵入や、ユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩をより一層確実に防止することができる。なお、円筒部位２ｐの溝部２ｄ及び弾性体２８の突条２８ｂの大きさや断面形状などは、キャップ２６を静止輪２に圧入させた際、これらの溝部２ｄと突条２８ｂが相互に係合可能で、係合して圧縮された(つぶれた)突条２８ｂが溝部２ｄへ隙間なく密着することが可能となるように双方で調整すればよい。また、本実施形態においては、上述した第１実施形態(図２及び図３)のように、キャップ２６に径方向への折り返し部分がないため、固定部２６ｂ(具体的には、その嵌合部２６ｆ)への成形時におけるゴム流れを確実に止めることができる。加えて、固定部２６ｂの外径側延出端(薄肉部２６ｇの周縁)、すなわち、めっき鋼板の断面(めっきのない部分)が弾性体２８で被覆されるため、防錆効果が高い。   With such a configuration, when the cap 26 is press-fitted into the stationary wheel 2 in order to mount the cap 26 on the hub unit bearing A, the protrusion 28b of the elastic body 28 engages with the groove 2d of the cylindrical portion 2p. It is compressed (collapsed) and comes into close contact with the groove 2d without any gap. Therefore, the degree of adhesion between the elastic body 28 and the cylindrical portion 2p can be remarkably increased, and the space between the fitting portion 26f of the cap 26 and the end surface 2b of the cylindrical portion 2p can be tightly closed. As a result, foreign matter (for example, muddy water, dust, etc.) from the fitting portion between the cap 26 and the stationary wheel 2 (the fitting portion between the fixed portion 26b (the folded portion 26e and the fitting portion 26f) and the cylindrical portion 2p) is obtained. Intrusion and leakage of the lubricant (for example, grease and lubricating oil) enclosed in the unit to the outside can be prevented more reliably. The size and cross-sectional shape of the groove 2d of the cylindrical portion 2p and the protrusion 28b of the elastic body 28 can be engaged with each other when the cap 26 is press-fitted into the stationary wheel 2. Thus, the protrusions 28b that have been engaged and compressed (collapsed) may be adjusted on both sides so that they can be in close contact with the groove 2d without a gap. Further, in the present embodiment, since the cap 26 does not have a folded portion in the radial direction as in the first embodiment (FIGS. 2 and 3) described above, the fixing portion 26b (specifically, its fitting) The rubber flow at the time of molding to the part 26f) can be stopped reliably. In addition, since the outer diameter side extended end (periphery of the thin portion 26g) of the fixed portion 26b, that is, the cross section of the plated steel plate (the portion without plating) is covered with the elastic body 28, the rust prevention effect is high.

(第３実施形態)
本実施形態に係るキャップ２６の構成を図６に示す。
本実施形態において、キャップ２６の底部２６ａは、その径(外径)が静止輪２の円筒部位２ｐの内径寸法よりも小寸で、かつ、被検出体４０及び保持部材４２の外径寸法よりも大寸に設定された板状をなしている。なお、底部２６ａの形状は、図６に示すような平坦状であってもよいし、周縁部が中心部に対してアウトボード側へ突出した(換言すれば、中心部が周縁部に対してインボード側へ突出した)段差構造をなしていてもよい(例えば、図３(ｃ),(ｄ)に示すような構成)。
固定部２６ｂは、底部２６ａの周縁部に連続し、円筒部位２ｐの内周部に沿うように所定の角度(一例として、略９０°)をなしてアウトボード側へ所定の長さ(かかる円筒部位２ｐの内周部と十分に当接可能で、かつ転動体１８と干渉することのない長さ)で延出している。固定部２６ｂの延出端部近傍２６ｈは、他の部位(底部２６ａの周縁部との連続部近傍(以下、連続部近傍２６ｉという))よりも拡径され、厚肉構成となっている。この場合、固定部２６ｂの延出端部近傍２６ｈの径(外径)は、静止輪２の円筒部位２ｐの内径寸法と略同寸に設定されているのに対し、連続部近傍２６ｉの径(外径)は、円筒部位２ｐの内径寸法よりも僅かに小寸に設定されている。これにより、固定部２６ｂは、延出端部近傍２６ｈと連続部近傍２６ｉとの間で段差を有する。
このように、キャップ２６は、底部２６ａからその周縁部に連続する固定部２６ｂに到る、全体が非常に単純なカップ状をなすように構成されている。 (Third embodiment)
The configuration of the cap 26 according to this embodiment is shown in FIG.
In the present embodiment, the diameter (outer diameter) of the bottom portion 26 a of the cap 26 is smaller than the inner diameter dimension of the cylindrical portion 2 p of the stationary ring 2, and the outer diameter dimensions of the detected body 40 and the holding member 42. Is also a large plate. The shape of the bottom 26a may be a flat shape as shown in FIG. 6, and the peripheral edge protrudes toward the outboard side with respect to the central part (in other words, the central part is relative to the peripheral part. A step structure (projecting toward the inboard side) may be formed (for example, a configuration as shown in FIGS. 3C and 3D).
The fixed portion 26b is continuous with the peripheral edge of the bottom portion 26a and forms a predetermined length (such as a cylinder) toward the outboard side at a predetermined angle (approximately 90 ° as an example) along the inner peripheral portion of the cylindrical portion 2p. The length extends so as to be sufficiently abuttable with the inner peripheral portion of the portion 2p and does not interfere with the rolling element 18). The extended end portion vicinity 26h of the fixing portion 26b is larger in diameter than other portions (near the continuous portion with the peripheral edge of the bottom portion 26a (hereinafter referred to as a continuous portion vicinity 26i)) and has a thick structure. In this case, the diameter (outer diameter) of the vicinity 26h of the extending portion 26b of the fixed portion 26b is set to be approximately the same as the inner diameter of the cylindrical portion 2p of the stationary ring 2, whereas the diameter of the continuous portion 26i is the same. (Outer diameter) is set slightly smaller than the inner diameter of the cylindrical portion 2p. As a result, the fixing portion 26b has a step between the extended end portion vicinity 26h and the continuous portion vicinity 26i.
As described above, the cap 26 is configured so as to form a very simple cup shape from the bottom portion 26a to the fixing portion 26b continuous to the peripheral portion thereof.

キャップ２６には、その外周部に弾性体２８が連結されており、図６に示す構成においては、固定部２６ｂの延出端部近傍２６ｈと連続部近傍２６ｉとの間の段差部分に対し、全周に亘ってゴム製の弾性体２８が連結されている。その際、弾性体２８は、前記段差部分にゴム製のリングを巻装した構成とすればよいが、当該段差部分を埋設するように加硫成形しても構わない。いずれの場合であっても、弾性体２８は、前記段差部分に連結した状態において、固定部２６ｂの延出端部近傍２６ｈよりも外径方向へ突出した構成となるように、その外径を延出端部近傍２６ｈの外径寸法(別の捉え方をすれば、静止輪２の円筒部位２ｐの内径寸法)よりも僅かに大寸に設定する。なお、本実施形態においては、キャップ２６の成形時に前記段差部分の途中を抑えることで、当該段差部分の延出端部近傍２６ｈ側へのゴム流れを防止している(図６に示すＰの部分)。   An elastic body 28 is connected to the outer periphery of the cap 26, and in the configuration shown in FIG. 6, with respect to the stepped portion between the extended end portion vicinity 26h and the continuous portion vicinity 26i of the fixed portion 26b, A rubber elastic body 28 is connected over the entire circumference. At that time, the elastic body 28 may be configured such that a rubber ring is wound around the stepped portion, but may be vulcanized to embed the stepped portion. In any case, the outer diameter of the elastic body 28 is such that the elastic body 28 protrudes in the outer diameter direction from the vicinity of the extended end portion 26h of the fixed portion 26b in a state where it is connected to the stepped portion. It is set slightly larger than the outer diameter of the vicinity of the extended end portion 26h (in other words, the inner diameter of the cylindrical portion 2p of the stationary ring 2). In the present embodiment, by suppressing the middle of the stepped portion when the cap 26 is molded, the rubber flow to the extended end portion vicinity 26h side of the stepped portion is prevented (P of FIG. 6). portion).

このような構成をなすキャップ２６をハブユニット軸受Ａに対して装着する際には、ハブユニット軸受Ａのインボード側端部を底部２６ａで覆うように、固定部２６ｂの延出端を静止輪２の円筒部位２ｐのインボード側へ向けて位置付ける。次に、固定部２６ｂの延出端部近傍２６ｈの外周部を円筒部位２ｐの内周部に沿わせるように、底部２６ａに所定の押圧力を加えつつ、キャップ２６をアウトボード側へ向けて圧入していく。そして、弾性体２８が円筒部位２ｐの内周縁部近傍(内周面、端面２ｂ、及びこれらの連続部)２ｅに当接し、つぶれるように弾性変形(圧縮)されて、当該内周縁部近傍２ｅと密着する(別の捉え方をすれば、内周縁部近傍２ｅが弾性体２８へ隙間なく食い込む)までキャップ２６を圧入し、固定部２６ｂの延出端部近傍２６ｈの外周部を円筒部位２ｐの内周部と嵌合させる。この状態においては、固定部２６ｂの延出端部近傍２６ｈにおける嵌合力と併せ、圧縮された(つぶれた)弾性体２８が円筒部位２ｐの内周縁部近傍に対して押圧力を作用させているため、位置決め固定したキャップ２６の静止輪２からの脱落防止を図るとともに、当該静止輪２に対する静止安定性を高めることができる。   When the cap 26 having such a configuration is attached to the hub unit bearing A, the extension end of the fixed portion 26b is fixed to the stationary ring so that the end portion on the inboard side of the hub unit bearing A is covered with the bottom portion 26a. The cylindrical part 2p of 2 is positioned toward the inboard side. Next, the cap 26 is directed toward the outboard side while applying a predetermined pressing force to the bottom portion 26a so that the outer peripheral portion in the vicinity of the extended end portion 26h of the fixing portion 26b is along the inner peripheral portion of the cylindrical portion 2p. Press fit. The elastic body 28 comes into contact with the vicinity of the inner peripheral edge (the inner peripheral surface, the end surface 2b, and a continuous portion thereof) 2e of the cylindrical portion 2p, and is elastically deformed (compressed) so as to be crushed. The cap 26 is press-fitted until it is in close contact with (if another way of grasping, the inner peripheral edge vicinity 2e bites into the elastic body 28 without a gap), and the outer peripheral part of the fixing part 26b in the vicinity of the extended end part 26h is the cylindrical part 2p. It is made to fit with the inner peripheral part. In this state, together with the fitting force in the vicinity of the extended end portion 26h of the fixing portion 26b, the compressed (collapsed) elastic body 28 exerts a pressing force on the vicinity of the inner peripheral edge portion of the cylindrical portion 2p. Therefore, it is possible to prevent the cap 26 that has been positioned and fixed from falling off the stationary wheel 2 and to improve the stationary stability with respect to the stationary wheel 2.

またこの時、弾性体２８が圧縮された(つぶれた)状態で円筒部位２ｐの内周縁部近傍２ｅと連続部近傍２６ｉとの間に介在するとともに、当該内周縁部近傍２ｅと密着し、延出端部近傍２６ｈと円筒部位２ｐの内周面との間を閉塞しているため、キャップ２６と静止輪２との嵌合部分(固定部２６ｂと円筒部位２ｐとの嵌合部分)からの異物(例えば、泥水や塵埃など)の侵入を確実に防止することができるとともに、ユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩を確実に防止することができる。また、固定部２６ｂの延出端部近傍２６ｈを厚肉構成としているため、静止輪２(円筒部位２ｐ)との嵌合強度を維持しつつ、嵌合によるキャップ外径の収縮により、キャップ２６の底部２６ａが軸方向(図６の左右方向)へ変形することを効果的に防止することができる。換言すれば、嵌合によるキャップ外径の収縮がセンサの被検出体(センサロータ)４０との対向面ともなる底部２６ａに与える影響を低減させることができ、結果として、センサの検出体と被検出体４０との対向間隔(エアギャップ)を一定に保ち、センサの検知精度(出力信号の品質)を高めることを可能とする。   At this time, the elastic body 28 is interposed between the vicinity of the inner peripheral edge 2e and the vicinity 26i of the cylindrical portion 2p in a compressed (collapsed) state, and is in close contact with the inner peripheral vicinity 2e. Since the space between the protruding end vicinity 26h and the inner peripheral surface of the cylindrical portion 2p is closed, the fitting portion between the cap 26 and the stationary ring 2 (the fitting portion between the fixed portion 26b and the cylindrical portion 2p) It is possible to reliably prevent foreign substances (for example, muddy water and dust) from entering, and to prevent leakage of lubricant (for example, grease and lubricating oil) enclosed inside the unit to the outside. it can. Further, since the vicinity of the extended end portion 26h of the fixed portion 26b has a thick structure, the cap 26 is contracted by contraction of the outer diameter of the cap by fitting while maintaining the fitting strength with the stationary wheel 2 (cylindrical portion 2p). Can be effectively prevented from deforming in the axial direction (left-right direction in FIG. 6). In other words, the influence of the shrinkage of the outer diameter of the cap due to the fitting on the bottom portion 26a that also serves as a surface facing the detected object (sensor rotor) 40 of the sensor can be reduced. The facing distance (air gap) with respect to the detection body 40 can be kept constant, and the detection accuracy (quality of the output signal) of the sensor can be improved.

このように、本実施形態によれば、キャップ２６及び弾性体２８の形態をいずれも単純化(簡素化)させることができる一方で、このような単純な形態でありながら、キャップ２６の静止安定性や脱落防止効果などを十分に高めることができる(すなわち、コストパフォーマンスが高い)。なお、弾性体２８が当接し、つぶれるように弾性変形(圧縮)されて密着する円筒部位２ｐ側の位置(領域)は、内周縁部近傍２ｅのうち、円筒部位２ｐの内周面、端面２ｂ、及びこれらの連続部のいずれか一箇所であってもよいし、内周面と端面２ｂや前記連続部と端面２ｂなどの二箇所であってもよく、これらの位置(領域)に対応して弾性体２８の大きさや断面形状などを調整すればよい。   As described above, according to the present embodiment, the cap 26 and the elastic body 28 can both be simplified (simplified), while the cap 26 is stationary and stable while having such a simple configuration. Performance and drop-off prevention effects can be sufficiently enhanced (that is, cost performance is high). The position (region) on the side of the cylindrical portion 2p where the elastic body 28 comes into contact and is elastically deformed (compressed) so as to be crushed is in close contact with the inner circumferential surface and end surface 2b of the cylindrical portion 2p in the vicinity of the inner peripheral edge 2e. , And any one of these continuous portions, or two locations such as the inner peripheral surface and the end surface 2b, or the continuous portion and the end surface 2b, corresponding to these positions (regions). Thus, the size and cross-sectional shape of the elastic body 28 may be adjusted.

(第４実施形態)
本実施形態に係るキャップ２６の構成を図７に示す。
本実施形態において、キャップ２６の底部２６ａは、その径(外径)が静止輪２の円筒部位２ｐの外径寸法と略同寸に設定された板状をなしている。なお、図７には、周縁部が中心部に対してアウトボード側へ突出した(換言すれば、中心部が周縁部に対してインボード側へ突出した)段差構造をなす底部２６ａの形状を示しているが、段差部２６ｄを有することなく平坦状に構成してもよい(例えば、図２及び図３(ａ),(ｂ)に示すような構成)。
固定部２６ｂは、底部２６ａの周縁部に凸曲状(いわゆるＲ状)に連続し、かつ静止輪２の円筒部位２ｐの肉厚を越えて縮径方向へ折り返した後(以下、当該部位を折り返し部２６ｃという)、当該円筒部位２ｐの内周部に沿うように所定の角度(一例として、略９０°)をなしてアウトボード側へ所定の長さ(かかる円筒部位２ｐの内周部と十分に当接可能で、かつ転動体１８と干渉することのない長さ)で延出している(以下、当該延出部位を円筒部２６ｊという)。固定部２６ｂの延出端部近傍２６ｈは、延出端へ向かうに従って徐々に拡径された後、徐々に縮径されることで、凸曲状に突出した構成となっている(以下、当該突出部位を突出部２６ｋ、延出端を開口部２６ｍという)。この場合、固定部２６ｂの円筒部２６ｊは、その外径が静止輪２の円筒部位２ｐの内径寸法よりも小寸に、突出部２６ｋは、その外径が円筒部位２ｐの内径寸法よりも大寸に、そして、開口部２６ｍは、その外径が円筒部位２ｐの内径寸法よりも小寸で、かつ、前記円筒部２６ｊの外径寸法よりも大寸にそれぞれ設定されている。なお、開口部２６ｍの外径を円筒部位２ｐの内径寸法よりも小寸に設定することで、図７に示すようにキャップ２６を静止輪２に圧入させる際、当該開口部２６ｍがガイドとなり、圧入作業をスムーズに行うことが可能となる。 (Fourth embodiment)
The configuration of the cap 26 according to this embodiment is shown in FIG.
In the present embodiment, the bottom portion 26 a of the cap 26 has a plate shape whose diameter (outer diameter) is set to be approximately the same as the outer diameter of the cylindrical portion 2 p of the stationary ring 2. In FIG. 7, the shape of the bottom portion 26 a that forms a step structure in which the peripheral portion protrudes toward the outboard side with respect to the central portion (in other words, the central portion protrudes toward the inboard side with respect to the peripheral portion). Although shown, it may be configured to be flat without having the step portion 26d (for example, a configuration as shown in FIG. 2 and FIGS. 3A and 3B).
The fixed portion 26b is convexly curved (so-called R-shaped) at the peripheral edge of the bottom portion 26a and is turned back in the direction of diameter reduction beyond the thickness of the cylindrical portion 2p of the stationary ring 2 (hereinafter, the portion is referred to as (Referred to as the folded portion 26c) and a predetermined angle (approximately 90 ° as an example) along the inner peripheral portion of the cylindrical portion 2p toward the outboard side (with the inner peripheral portion of the cylindrical portion 2p). (The length that does not interfere with the rolling element 18) (hereinafter, the extended portion is referred to as a cylindrical portion 26j). The extended end portion vicinity 26h of the fixed portion 26b is configured to protrude in a convex shape by gradually increasing the diameter toward the extended end and then gradually reducing the diameter (hereinafter referred to as the above-mentioned). The protruding portion is referred to as a protruding portion 26k, and the extended end is referred to as an opening portion 26m). In this case, the cylindrical portion 26j of the fixed portion 26b has an outer diameter smaller than the inner diameter of the cylindrical portion 2p of the stationary ring 2, and the protrusion 26k has an outer diameter larger than the inner diameter of the cylindrical portion 2p. The outer diameter of the opening 26m is set smaller than the inner diameter of the cylindrical portion 2p and larger than the outer diameter of the cylindrical portion 26j. By setting the outer diameter of the opening 26m to be smaller than the inner diameter of the cylindrical portion 2p, the opening 26m serves as a guide when the cap 26 is press-fitted into the stationary wheel 2 as shown in FIG. The press-fitting work can be performed smoothly.

ここで、静止輪２の円筒部位２ｐの内周部には、内周面(すなわち、回転輪４(内輪構成体１６)との対向周面)を凹状に窪ませてなる溝部２ｆが全周に亘って連続して形成されており、突出部２６ｋは、当該溝部２ｆの形成位置に対応するように、固定部２６ｂの延出端部近傍２６ｈ(すなわち、静止輪２(円筒部位２ｐ)との対向周部)に対して全周に亘って連続して配設する。その際、円筒部位２ｐの溝部２ｆ及び固定部２６ｂの突出部２６ｋの大きさ、形状、深さや高さなどは、図７に示すようにキャップ２６を静止輪２に圧入させた際、突出部２６ｋに圧縮力が作用されつつ、溝部２ｆに押圧力が作用された状態で、これらが相互に係合可能となるように、双方で調整すればよい。また、溝部２ｆと突出部２６ｋの配設位置は、キャップ２６の静止輪２への圧入時に折り返し部２６ｃが円筒部位２ｐの端面２ｂと当接した状態において、相互に係合可能となるように調整する。これにより、突出部２６ｋを溝部２ｆと係合させた際の係合部分は、底部２６ａ及び固定部２６ｂ(折り返し部２６ｃ)によってハブユニット軸受Ａの外部から閉塞される。   Here, the inner peripheral portion of the cylindrical portion 2p of the stationary wheel 2 has a groove portion 2f formed by recessing the inner peripheral surface (that is, the peripheral surface facing the rotating wheel 4 (inner ring constituent body 16)) in a concave shape. The projecting portion 26k is formed so as to correspond to the position where the groove 2f is formed, and in the vicinity of the extended end 26h of the fixed portion 26b (that is, the stationary ring 2 (cylindrical portion 2p)). Are arranged continuously over the entire circumference. At this time, the size, shape, depth, height, etc. of the groove 2f of the cylindrical portion 2p and the protrusion 26k of the fixed portion 26b are determined when the cap 26 is press-fitted into the stationary wheel 2 as shown in FIG. Adjustment may be made on both sides so that they can be engaged with each other in a state where a pressing force is applied to the groove 2f while a compressive force is applied to 26k. In addition, the groove 2f and the protrusion 26k are disposed so that they can be engaged with each other when the folded portion 26c is in contact with the end surface 2b of the cylindrical portion 2p when the cap 26 is press-fitted into the stationary wheel 2. adjust. Thereby, the engaging portion when the protruding portion 26k is engaged with the groove portion 2f is blocked from the outside of the hub unit bearing A by the bottom portion 26a and the fixing portion 26b (folded portion 26c).

キャップ２６には、その外周部に弾性体２８が連結されており、図７に示す構成においては、固定部２６ｂの円筒部２６ｊに対し、全周に亘ってゴム製の弾性体２８が連結されている。この場合、弾性体２８は、円筒部２６ｊにゴム製のリングを巻装した構成とされており、その際、当該リングは円筒部２６ｊに対して単に巻き付けた状態のままであってもよいが、接着などにより固着させても構わない。いずれの場合であっても、弾性体２８は、キャップ２６の静止輪２への圧入時に突出部２６ｋを溝部２ｆに係合させた際、径方向(図７の上下方向)に対して圧縮された状態となるように、その外径寸法を設定して円筒部２６ｊに巻装する。なお、静止輪２(円筒部位２ｐ)の溝部２ｆの深さＬ１は、前記圧縮された状態の弾性体２８の肉厚(外内径差)Ｌ２よりも大寸(Ｌ１＞Ｌ２)に設定しておく。このような寸法設定とすることで、キャップ２６の静止輪２への圧入時に突出部２６ｋを溝部２ｆに係合させると、弾性体２８を容易に圧縮させることが可能となる。   An elastic body 28 is connected to the outer periphery of the cap 26. In the configuration shown in FIG. 7, a rubber elastic body 28 is connected to the cylindrical portion 26j of the fixed portion 26b over the entire periphery. ing. In this case, the elastic body 28 has a configuration in which a rubber ring is wound around the cylindrical portion 26j. At this time, the ring may remain simply wound around the cylindrical portion 26j. It may be fixed by bonding or the like. In any case, the elastic body 28 is compressed in the radial direction (vertical direction in FIG. 7) when the protrusion 26k is engaged with the groove 2f when the cap 26 is pressed into the stationary wheel 2. The outer diameter dimension is set so as to be in a state of being wound, and is wound around the cylindrical portion 26j. The depth L1 of the groove 2f of the stationary ring 2 (cylindrical portion 2p) is set to be larger (L1> L2) than the thickness (outer inner diameter difference) L2 of the compressed elastic body 28. deep. By setting the dimensions as described above, the elastic body 28 can be easily compressed when the protrusion 26k is engaged with the groove 2f when the cap 26 is pressed into the stationary wheel 2.

このような構成をなすキャップ２６をハブユニット軸受Ａに対して装着する際には、ハブユニット軸受Ａのインボード側端部を底部２６ａで覆うように、開口部２６ｍを静止輪２の円筒部位２ｐのインボード側へ向けて位置付ける。次に、突出部２６ｋの外周部を円筒部位２ｐの内周部に沿わせるように、底部２６ａに所定の押圧力を加えつつ、キャップ２６をアウトボード側へ向けて圧入していく。そして、折り返し部２６ｃが円筒部位２ｐの端面２ｂに当接するとともに、突出部２６ｋが当該円筒部位２ｐの溝部２ｆと係合するまでキャップ２６を圧入し、固定部２６ｂを円筒部位２ｐと嵌合させる。なお、キャップ２６をよりスムーズに圧入するため、突出部２６ｋの根元部分に周方向へ沿って数箇所、スリット(径方向への切り込み)２６ｑを形成してもよい(図７の破線で示す部分)。
この状態においては、突出部２６ｋと溝部２ｆが応力(圧縮力と押圧力)をもって相互に係合しているため、キャップ２６を静止輪２に対して軸方向(図７の左右方向)と径方向(同図の上下方向)のいずれにも精度よく位置決め固定することができる。したがって、静止輪２からのキャップ２６の脱落防止を図ることができるとともに、キャップ２６の静止輪２に対する静止安定性を高めることができる。このため、センサの被検出体(センサロータ)４０とキャップ２６の底部２６ａとの対向間隔を狭める(詰める)ことが可能となり、軸受のコンパクト化につながる。 When the cap 26 having such a configuration is attached to the hub unit bearing A, the opening 26m is formed in the cylindrical portion of the stationary ring 2 so that the inboard side end of the hub unit bearing A is covered with the bottom 26a. Position toward the 2p inboard side. Next, the cap 26 is press-fitted toward the outboard side while applying a predetermined pressing force to the bottom portion 26a so that the outer peripheral portion of the protruding portion 26k is along the inner peripheral portion of the cylindrical portion 2p. The folded portion 26c contacts the end surface 2b of the cylindrical portion 2p, and the cap 26 is press-fitted until the protruding portion 26k engages with the groove portion 2f of the cylindrical portion 2p, so that the fixing portion 26b is fitted to the cylindrical portion 2p. . In order to press-fit the cap 26 more smoothly, slits (cuts in the radial direction) 26q may be formed at several points along the circumferential direction in the root portion of the protruding portion 26k (the portion indicated by the broken line in FIG. 7). ).
In this state, since the protrusion 26k and the groove 2f are engaged with each other with stress (compression force and pressing force), the cap 26 is axially (left and right in FIG. 7) and diameter with respect to the stationary wheel 2. It can be positioned and fixed with high precision in any direction (vertical direction in the figure). Therefore, it is possible to prevent the cap 26 from falling off the stationary wheel 2 and to enhance the stationary stability of the cap 26 with respect to the stationary wheel 2. For this reason, it is possible to narrow (close) the facing distance between the detection object (sensor rotor) 40 of the sensor and the bottom portion 26a of the cap 26, leading to a compact bearing.

また、キャップ２６を静止輪２に対して圧入した状態においては、突出部２６ｋに作用される圧縮力の反力として、溝部２ｆに押圧力が作用されており、円筒部２６ｊに巻装された弾性体２８が当該円筒部２６ｊの外周部及び円筒部位２ｐの内周部にそれぞれ押し付けられ、圧縮された(つぶれた)状態でこれらの間に介在される。この結果、かかる弾性体２８も円筒部２６ｊの外周部及び円筒部位２ｐの内周部に対してそれぞれ押圧力を作用させてこれらと密着し、円筒部２６ｊの外周部と円筒部位２ｐの内周部との間を閉塞する。したがって、キャップ２６と静止輪２との嵌合部分(固定部２６ｂと円筒部位２ｐとの嵌合部分)からの異物(例えば、泥水や塵埃など)の侵入を確実に防止することができるとともに、ユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩を確実に防止することができる。   Further, in the state where the cap 26 is press-fitted into the stationary wheel 2, a pressing force is applied to the groove 2f as a reaction force of the compressive force applied to the protrusion 26k, and the coil 26 is wound around the cylindrical portion 26j. The elastic body 28 is pressed against the outer peripheral portion of the cylindrical portion 26j and the inner peripheral portion of the cylindrical portion 2p, and is interposed between them in a compressed (collapsed) state. As a result, the elastic body 28 is also in close contact with the outer peripheral portion of the cylindrical portion 26j and the inner peripheral portion of the cylindrical portion 2p by applying a pressing force to the outer peripheral portion and the inner peripheral portion of the cylindrical portion 2p. Block between the parts. Therefore, foreign matter (for example, muddy water, dust, etc.) can be reliably prevented from entering from the fitting portion between the cap 26 and the stationary wheel 2 (the fitting portion between the fixed portion 26b and the cylindrical portion 2p). Leakage of the lubricant (for example, grease or lubricating oil) enclosed in the unit can be reliably prevented.

なお、本実施形態においては、図７に示すように、キャップ２６を静止輪２に対して圧入した状態において静止輪２の円筒部位２ｐの内周部と対向する固定部２６ｂの円筒部２６ｊに弾性体２８を連結した構成としているが、弾性体の連結位置はこれに限定されない。例えば、図８に示す本実施形態の変形例のように、固定部２６ｂの円筒部２６ｊに加えて、キャップ２６を圧入した状態において円筒部位２ｐの端面２ｂと対向する部位となる折り返し部２６ｃにも弾性体を連結させた構成としてもよい(以下、便宜上、円筒部２６ｊに巻装される弾性体を円筒部弾性体２８といい、折り返し部２６ｃに巻装される弾性体を折り返し部弾性体３０という)。あるいは、弾性体として、折り返し部弾性体３０のみを折り返し部２６ｃに巻装した構成とすることも可能である。
図８に示す変形例においては、折り返し部弾性体３０として、ゴム製のリングを折り返し部２６ｃに巻装した構成となっている。なお、かかるリングは、折り返し部２６ｃに対して単に巻き付けた状態のままであってもよいし、接着などにより固着させても構わない。いずれの場合であっても、折り返し部弾性体３０は、キャップ２６の静止輪２への圧入時に突出部２６ｋを溝部２ｆに係合させた際、軸方向(図８の左右方向)に対して圧縮された状態となるように、その外径寸法を設定して折り返し部２６ｃに巻装する。 In the present embodiment, as shown in FIG. 7, in the state where the cap 26 is press-fitted into the stationary wheel 2, the cylindrical portion 26j of the fixed portion 26b facing the inner peripheral portion of the cylindrical portion 2p of the stationary wheel 2 is provided. Although the elastic body 28 is connected, the connection position of the elastic body is not limited to this. For example, as in the modification of the present embodiment shown in FIG. 8, in addition to the cylindrical portion 26j of the fixing portion 26b, the folded portion 26c that is a portion facing the end surface 2b of the cylindrical portion 2p in a state where the cap 26 is press-fitted. The elastic body wound around the cylindrical portion 26j is referred to as the cylindrical elastic body 28, and the elastic body wound around the folded-back portion 26c is referred to as the folded-back elastic body. 30). Alternatively, it is possible to adopt a configuration in which only the folded portion elastic body 30 is wound around the folded portion 26c as the elastic body.
In the modification shown in FIG. 8, a rubber ring is wound around the folded portion 26 c as the folded portion elastic body 30. Such a ring may remain in a state of being simply wound around the folded portion 26c, or may be fixed by adhesion or the like. In any case, when the cap 26 is pressed into the stationary wheel 2 and the protrusion 26k is engaged with the groove 2f when the cap 26 is press-fitted into the stationary wheel 2, the folded-back elastic body 30 is in the axial direction (left-right direction in FIG. 8). The outer diameter is set so as to be in a compressed state and wound around the folded portion 26c.

このような構成とすることで、キャップ２６を静止輪２に対して圧入した状態においては、円筒部弾性体２８が円筒部２６ｊの外周部及び円筒部位２ｐの内周部にそれぞれ押し付けられ、圧縮された(つぶれた)状態でこれらの間に介在されるとともに、折り返し部弾性体３０が折り返し部２６ｃのアウトボード側及び円筒部位２ｐの端面２ｂにそれぞれ押し付けられ、圧縮された(つぶれた)状態でこれらの間に介在される。この結果、円筒部弾性体２８が円筒部２６ｊの外周部及び円筒部位２ｐの内周部に対してそれぞれ押圧力を作用させてこれらと密着し、円筒部２６ｊの外周部と円筒部位２ｐの内周部との間を閉塞するとともに、折り返し部弾性体３０が折り返し部２６ｃのアウトボード側及び円筒部位２ｐの端面２ｂに対してそれぞれ押圧力を作用させてこれらと密着し、折り返し部２６ｃのアウトボード側と円筒部位２ｐの端面２ｂとの間を閉塞する。
したがって、キャップ２６と静止輪２との嵌合部分(固定部２６ｂと円筒部位２ｐとの嵌合部分)からの異物(例えば、泥水や塵埃など)の侵入、及びユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩を二箇所でより一層確実に防止することができる。 With such a configuration, in a state where the cap 26 is press-fitted into the stationary wheel 2, the cylindrical elastic body 28 is pressed against the outer peripheral portion of the cylindrical portion 26j and the inner peripheral portion of the cylindrical portion 2p, and compressed. The folded-back elastic body 30 is pressed against the outboard side of the folded-back portion 26c and the end surface 2b of the cylindrical portion 2p and compressed (crushed). Intervening between them. As a result, the cylindrical elastic body 28 applies a pressing force to the outer peripheral portion of the cylindrical portion 26j and the inner peripheral portion of the cylindrical portion 2p to be in close contact with each other, and the inner peripheral portion of the cylindrical portion 26j and the inner portion of the cylindrical portion 2p. While closing between the periphery, the folded-back elastic body 30 is in close contact with the outboard side of the folded-back portion 26c and the end surface 2b of the cylindrical portion 2p by being in close contact with each other. The space between the board side and the end surface 2b of the cylindrical portion 2p is closed.
Accordingly, foreign matter (for example, muddy water, dust, etc.) enters from the fitting portion between the cap 26 and the stationary wheel 2 (the fitting portion between the fixed portion 26b and the cylindrical portion 2p), and the lubricant sealed inside the unit. Leakage to the outside (for example, grease or lubricating oil) can be more reliably prevented at two locations.

(第５実施形態)
本実施形態に係るキャップ２６の構成を図９に示す。
本実施形態において、キャップ２６の底部２６ａは、その径(外径)が静止輪２の円筒部位２ｐの内径寸法と略同寸に設定された板状をなしている。なお、底部２６ａの形状は、図９に示すような平坦状であってもよいし、周縁部が中心部に対してアウトボード側へ突出した(換言すれば、中心部が周縁部に対してインボード側へ突出した)段差構造をなしていてもよい(例えば、図３(ｃ),(ｄ)に示すような構成)。
固定部２６ｂは、底部２６ａの周縁部に連続し、円筒部位２ｐの内周部に沿うように所定の角度(一例として、略９０°)をなしてアウトボード側へ所定の長さ(かかる円筒部位２ｐの内周部と十分に当接可能で、かつ転動体１８と干渉することのない長さ)で延出している。 (Fifth embodiment)
The configuration of the cap 26 according to this embodiment is shown in FIG.
In the present embodiment, the bottom 26 a of the cap 26 has a plate shape whose diameter (outer diameter) is set to be approximately the same as the inner diameter of the cylindrical portion 2 p of the stationary ring 2. The shape of the bottom 26a may be a flat shape as shown in FIG. 9, or the peripheral edge protrudes toward the outboard side with respect to the central part (in other words, the central part is relative to the peripheral part. A step structure (projecting toward the inboard side) may be formed (for example, a configuration as shown in FIGS. 3C and 3D).
The fixed portion 26b is continuous with the peripheral edge of the bottom portion 26a and forms a predetermined length (such as a cylinder) toward the outboard side at a predetermined angle (approximately 90 ° as an example) along the inner peripheral portion of the cylindrical portion 2p. The length extends so as to be sufficiently abuttable with the inner peripheral portion of the portion 2p and does not interfere with the rolling element 18).

キャップ２６には、その内周部に弾性体２８が連結されており、図９に示す構成においては、固定部２６ｂの内周部全体からその延出端の外周縁部へ到るまでのキャップ２６の表面領域に対し、全周に亘ってゴム製の弾性体２８が連結(加硫成形)されている。この場合、弾性体２８は、前記表面領域を全周に亘って被覆するように成形されるとともに、固定部２６ｂの延出端外周縁部に全周に亘って所定高さで凸状に連続して突出する突条２８ｂを有している。   An elastic body 28 is connected to the inner peripheral portion of the cap 26. In the configuration shown in FIG. 9, the cap extends from the entire inner peripheral portion of the fixed portion 26b to the outer peripheral edge portion of the extending end. An elastic body 28 made of rubber is connected (vulcanized) to the surface area 26 over the entire circumference. In this case, the elastic body 28 is molded so as to cover the entire surface region, and is continuously convex at a predetermined height over the entire outer peripheral edge of the extending end of the fixing portion 26b. And has a protruding protrusion 28b.

ここで、静止輪２の円筒部位２ｐの内周部には、内周面を凹状に窪ませてなる溝部２ｆが全周に亘って連続して形成されており、突条２８ｂは、当該溝部２ｆの形成位置に対応するように、固定部２６ｂの延出端外周縁部に対して成形する。なお、図９に示す構成においては、溝部２ｆを静止輪２の製造工程で形成した研削逃げ部(溝)を弾性体２８の突条２８ｂを係合させる溝部２ｆとして流用しているが、突条２８ｂを係合させるための専用の溝として溝部２ｆを形成しても構わない。ただし、これらの溝部２ｆは必ず形成しなければならない訳ではない。   Here, in the inner peripheral portion of the cylindrical portion 2p of the stationary ring 2, a groove portion 2f having a concave inner peripheral surface is continuously formed over the entire circumference, and the protrusion 28b is formed in the groove portion. It shape | molds with respect to the extension edge outer peripheral part of the fixing | fixed part 26b so that it may correspond to the formation position of 2f. In the configuration shown in FIG. 9, the grinding relief portion (groove) formed in the manufacturing process of the stationary wheel 2 is used as the groove portion 2 f for engaging the protrusion 28 b of the elastic body 28. The groove 2f may be formed as a dedicated groove for engaging the strip 28b. However, these groove portions 2f are not necessarily formed.

このような構成とすることで、キャップ２６をハブユニット軸受Ａへ装着させるために静止輪２に対して圧入した際、弾性体２８の突条２８ｂが円筒部位２ｐの溝部２ｆと係合し、当該溝部２ｆへ食い込むように密着する。したがって、キャップ２６の固定部２６ｂと円筒部位２ｐの内周部との間を確実に閉塞することができる。これにより、キャップ２６と静止輪２との嵌合部分(固定部２６ｂと円筒部位２ｐとの嵌合部分)からの異物(例えば、泥水や塵埃など)の侵入、及びユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩を確実に防止することができる。なお、円筒部位２ｐの溝部２ｆ及び弾性体２８の突条２８ｂの大きさ、形状、深さや高さなどは、図９に示すようにキャップ２６を静止輪２に圧入させた際、これらの溝部２ｆと突条２８ｂが相互に係合可能で、係合した突条２８ｂが溝部２ｆと隙間なく密着することが可能となるように双方で調整すればよい。
また、キャップ２６を静止輪２に対して圧入した状態においては、突条２８ｂと溝部２ｆが相互に密着しながら係合しているため、静止輪２からのキャップ２６の脱落防止効果を高めることができる。 With such a configuration, when the cap 26 is press-fitted into the stationary ring 2 in order to attach the cap 26 to the hub unit bearing A, the protrusion 28b of the elastic body 28 engages with the groove 2f of the cylindrical portion 2p, It sticks so that it may bite into the said groove part 2f. Therefore, the space between the fixed portion 26b of the cap 26 and the inner peripheral portion of the cylindrical portion 2p can be reliably closed. As a result, foreign matter (for example, muddy water, dust, etc.) enters from the fitting portion between the cap 26 and the stationary wheel 2 (the fitting portion between the fixed portion 26b and the cylindrical portion 2p), and lubrication sealed inside the unit. Leakage of an agent (for example, grease or lubricating oil) to the outside can be reliably prevented. The size, shape, depth, height, and the like of the groove 2f of the cylindrical portion 2p and the protrusion 28b of the elastic body 28 are determined when the cap 26 is press-fitted into the stationary wheel 2 as shown in FIG. Adjustment may be made on both sides so that the 2f and the protrusion 28b can be engaged with each other and the engaged protrusion 28b can be in close contact with the groove 2f without a gap.
Further, when the cap 26 is press-fitted into the stationary wheel 2, the protrusion 28 b and the groove 2 f are engaged with each other while being in close contact with each other, so that the effect of preventing the cap 26 from falling off the stationary wheel 2 is enhanced. Can do.

なお、本実施形態に係るキャップ構成は、図９に示す構成には限定されず、例えば、図１０に示す変形例のような構成としても同様の作用効果を得ることができる。
図１０に示す変形例において、固定部２６ｂの延出端外周縁部の近傍は、全周に亘って縮径されて凹状に窪んだ状態(薄肉状態)となっており、当該凹状に窪んだ部位を埋設するように弾性体２８が成形されている。また、静止輪２の円筒部位２ｐの内周部には、製造工程で形成した研削逃げ部(溝)を流用せず、弾性体２８の突条２８ｂを係合させるための専用の溝として溝部２ｆを形成している。 Note that the cap configuration according to the present embodiment is not limited to the configuration illustrated in FIG. 9, and for example, the same function and effect can be obtained as a configuration like the modification illustrated in FIG. 10.
In the modification shown in FIG. 10, the vicinity of the outer peripheral edge of the extending end of the fixed portion 26 b is in a state of being reduced in diameter and recessed in a concave shape (thin state), and is recessed in the concave shape. An elastic body 28 is formed so as to embed the part. In addition, a groove portion as a dedicated groove for engaging the protrusion 28b of the elastic body 28 is not used on the inner peripheral portion of the cylindrical portion 2p of the stationary ring 2 without using the grinding relief portion (groove) formed in the manufacturing process. 2f is formed.

上述した第１実施形態から第５実施形態(所定の変形例を含む)(図２から図１０)においては、キャップ２６を静止輪２(円筒部位２ｐ)に対して嵌合固定させるとともに、その嵌合部分へ弾性体２８を介在させること、あるいは、凹凸形状(溝部２ｆと突出部２６ｋや突条２８ｂ)を係合させることで、キャップ２６の静止輪２に対する密着性を高め、静止輪２からの脱落防止や当該静止輪２に対する静止安定性の向上を図るとともに、前記嵌合部分からの異物(例えば、泥水や塵埃など)の侵入、及びユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩の防止を図っている。かかる脱落や異物侵入などの防止方法は、キャップ２６と静止輪２(円筒部位２ｐ)との嵌合部分への弾性体２８の介在や、凹凸形状(溝部２ｆと突出部２６ｋや突条２８ｂ)による係合構造の適用に限定されることはなく、これに代えて、あるいは加えて他の方法によって行うことも可能である。例えば、以下に説明する第６実施形態から第８実施形態においては、キャップ２６と静止輪２(円筒部位２ｐ)との嵌合部分をレーザー溶接することで上記脱落や異物侵入の防止などを図っている。   In the above-described first to fifth embodiments (including predetermined modifications) (FIGS. 2 to 10), the cap 26 is fitted and fixed to the stationary wheel 2 (cylindrical portion 2p), and the By interposing the elastic body 28 in the fitting portion, or by engaging the concavo-convex shape (the groove 2f and the protrusion 26k or the protrusion 28b), the adhesion of the cap 26 to the stationary wheel 2 is enhanced, and the stationary wheel 2 In addition to preventing falling off of the stationary wheel 2 and improving the stationary stability with respect to the stationary wheel 2, foreign matter (for example, muddy water and dust) enters from the fitting portion, and a lubricant (for example, grease) enclosed in the unit. To prevent leakage to the outside. Such a method of preventing the drop or the entry of foreign matter can be achieved by interposing the elastic body 28 in the fitting portion between the cap 26 and the stationary ring 2 (cylindrical portion 2p), or by forming an irregular shape (the groove 2f, the protrusion 26k, and the protrusion 28b). However, the present invention is not limited to the application of the engagement structure according to the present invention, and can be performed by other methods instead of or in addition to this. For example, in the sixth to eighth embodiments described below, the fitting portion between the cap 26 and the stationary ring 2 (cylindrical portion 2p) is laser-welded to prevent the above-described dropout or entry of foreign matter. ing.

(第６実施形態)
本実施形態に係るキャップ２６の構成を図１１に示す。
本実施形態において、キャップ２６の底部２６ａは、その径(外径)が静止輪２の円筒部位２ｐの内径寸法と略同寸に設定された板状をなしている。なお、図１１には、周縁部が中心部に対してインボード側へ突出した(換言すれば、中心部が周縁部に対してアウトボード側へ突出した)段差構造をなす底部２６ａの形状を示しているが、これとは逆に、周縁部が中心部に対してアウトボード側へ突出した(換言すれば、中心部が周縁部に対してインボード側へ突出した)段差構造としてもよいし(例えば、図３(ｃ),(ｄ)に示すような構成)、あるいは、段差部２６ｄを有することなく平坦状に構成しても構わない(例えば、図２及び図３(ａ),(ｂ)に示すような構成)。
固定部２６ｂは、底部２６ａの周縁部に連続し、円筒部位２ｐの内周部に沿うように所定の角度(一例として、略９０°)をなしてアウトボード側へ所定の長さ(かかる円筒部位２ｐの内周部と十分に当接可能で、かつ転動体１８と干渉することのない長さ)で延出している。 (Sixth embodiment)
The configuration of the cap 26 according to the present embodiment is shown in FIG.
In the present embodiment, the bottom 26 a of the cap 26 has a plate shape whose diameter (outer diameter) is set to be approximately the same as the inner diameter of the cylindrical portion 2 p of the stationary ring 2. In FIG. 11, the shape of the bottom 26 a that forms a step structure in which the peripheral edge protrudes toward the inboard side with respect to the central part (in other words, the central part protrudes toward the outboard side with respect to the peripheral edge). Although shown in the figure, on the contrary, the peripheral portion may protrude to the outboard side with respect to the center portion (in other words, the center portion may protrude to the inboard side with respect to the peripheral portion). (For example, a configuration as shown in FIGS. 3C and 3D) or a flat configuration without the stepped portion 26d (for example, FIGS. 2 and 3A, (Configuration as shown in (b)).
The fixed portion 26b is continuous with the peripheral edge of the bottom portion 26a and forms a predetermined length (such as a cylinder) toward the outboard side at a predetermined angle (approximately 90 ° as an example) along the inner peripheral portion of the cylindrical portion 2p. The length extends so as to be sufficiently abuttable with the inner peripheral portion of the portion 2p and does not interfere with the rolling element 18).

本実施形態においては、ハブユニット軸受Ａのインボード側端部を底部２６ａで覆うように、固定部２６ｂの外周部全体を円筒部位２ｐの内周部と嵌合させることで、キャップ２６を静止輪２に対して位置決め固定している。
そして、かかる固定部２６ｂと円筒部位２ｐの嵌合部分がユニット外部へ露出される部位(以下、露出部３２という)をレーザー溶接により接合している。具体的には、図１１に示すように、キャップ２６のインボード側の外周縁部(固定部２６ｂと底部２６ａが連続する部分)と、円筒部位２ｐの内周縁部(内周面と端面２ｂが連続する部分)との間をレーザー溶接により接合し、閉塞している。その際、露出部３２のうち、その周方向数箇所をスポット溶接するに止めることも可能であるが、露出部３２を全周に亘って溶接により接合し、当該露出部３２を全周に亘って完全に閉塞させることが好ましい。
このように露出部３２をレーザー溶接により接合することで、キャップ２６が静止輪２に対して固着され、固定部２６ｂと円筒部位２ｐの嵌合部分における嵌合力を高めることができ、キャップ２６が静止輪２から脱落することを確実に防止することができる。また、露出部３２をレーザー溶接により閉塞させることで、固定部２６ｂと円筒部位２ｐの嵌合部分からの異物(例えば、泥水や塵埃など)の侵入、及びユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩を確実に防止することができる。 In the present embodiment, the cap 26 is stationary by fitting the entire outer peripheral portion of the fixed portion 26b with the inner peripheral portion of the cylindrical portion 2p so that the end portion on the inboard side of the hub unit bearing A is covered with the bottom portion 26a. The positioning is fixed with respect to the wheel 2.
And the site | part (henceforth the exposed part 32) where the fitting part of this fixing | fixed part 26b and the cylindrical site | part 2p is exposed outside a unit is joined by laser welding. Specifically, as shown in FIG. 11, the outer peripheral edge portion (the portion where the fixed portion 26b and the bottom portion 26a are continuous) on the inboard side of the cap 26 and the inner peripheral edge portion (the inner peripheral surface and the end surface 2b) of the cylindrical portion 2p. Are connected by laser welding and closed. At that time, it is possible to stop spot welding at several places in the circumferential direction of the exposed portion 32, but the exposed portion 32 is joined by welding over the entire circumference, and the exposed portion 32 is spread over the entire circumference. It is preferable to block completely.
By joining the exposed portion 32 by laser welding in this way, the cap 26 is fixed to the stationary wheel 2, and the fitting force at the fitting portion between the fixed portion 26b and the cylindrical portion 2p can be increased. It is possible to reliably prevent the stationary wheel 2 from falling off. Further, by closing the exposed portion 32 by laser welding, intrusion of foreign matter (for example, muddy water or dust) from the fitting portion of the fixed portion 26b and the cylindrical portion 2p, and a lubricant (for example, the inside of the unit) , Grease and lubricating oil) can be reliably prevented from leaking outside.

(第７実施形態)
本実施形態は、露出部３２に対するレーザー溶接をより行い易くすることを考慮した形態となっている。本実施形態に係るキャップ２６の構成の一例を図１２に示す。
本実施形態において、キャップ２６の固定部２６ｂは、底部２６ａの周縁部に所定の角度(鈍角)をなして連続し、徐々に拡径された後(以下、当該拡径された部位を拡径部２６ｎという)、円筒部位２ｐの内周部に沿うようにアウトボード側へ所定の長さ(かかる円筒部位２ｐの内周部と十分に当接可能で、かつ転動体１８と干渉することのない長さ)で延出している(以下、当該延出部位を嵌合部２６ｐという)。この場合、拡径部２６ｎが底部２６ａと連続する際の角度は鈍角であれば特に限定されるものではないが、例えば、１２０°程度の広角に設定することが好ましい。
なお、底部２６ａの形状は、図１２に示すような平坦状であってもよいし、周縁部が中心部に対してインボード側へ突出した(換言すれば、中心部が周縁部に対してアウトボード側へ突出した)段差構造をなしていてもよいし(例えば、図１１に示すような構成)、これとは逆に、周縁部が中心部に対してアウトボード側へ突出した(換言すれば、中心部が周縁部に対してインボード側へ突出した)段差構造であっても構わない(例えば、図３(ｃ),(ｄ)に示すような構成)。 (Seventh embodiment)
In the present embodiment, it is considered to make it easier to perform laser welding on the exposed portion 32. An example of the configuration of the cap 26 according to this embodiment is shown in FIG.
In the present embodiment, the fixing portion 26b of the cap 26 is continuous with the peripheral edge of the bottom portion 26a at a predetermined angle (obtuse angle) and is gradually expanded in diameter (hereinafter, the expanded portion is referred to as “expanded”). Part 26n), a predetermined length toward the outboard side along the inner peripheral part of the cylindrical part 2p (which can sufficiently contact the inner peripheral part of the cylindrical part 2p and interfere with the rolling elements 18). (The length of the extension portion is hereinafter referred to as a fitting portion 26p). In this case, the angle when the enlarged diameter portion 26n is continuous with the bottom portion 26a is not particularly limited as long as it is an obtuse angle, but for example, it is preferably set to a wide angle of about 120 °.
The shape of the bottom portion 26a may be a flat shape as shown in FIG. 12, or the peripheral portion protrudes toward the inboard side with respect to the central portion (in other words, the central portion is relative to the peripheral portion. A step structure (projecting toward the outboard side) may be formed (for example, a configuration as shown in FIG. 11), and conversely, the peripheral edge projects toward the outboard side with respect to the central portion (in other words, In this case, a step structure in which the center portion protrudes toward the inboard side with respect to the peripheral portion may be used (for example, a configuration as shown in FIGS. 3C and 3D).

そして、キャップ２６は、固定部２６ｂの拡径部２６ｎと嵌合部２６ｐが連続する部位の外周縁が円筒部位２ｐの内周縁部(内周面と端面２ｂが連続する部分)と当接するまで静止輪２に対して圧入され、嵌合部２６ｐの外周部全体を円筒部位２ｐの内周部と嵌合させることで、静止輪２に対して位置決め固定されている。
この結果、固定部２６ｂの嵌合部２６ｐと円筒部位２ｐの嵌合部分がユニット外部へ露出される部位(露出部３２)は、当該固定部２６ｂの拡径部２６ｎと当該円筒部位２ｐの端面２ｂとがなす角度でユニット外部へ露出されることとなる。すなわち、拡径部２６ｎと底部２６ａの連続角と略同一の鈍角(例えば、１２０°程度の広角)で露出部３２がユニット外部へ露出される。
したがって、露出部３２を広くユニット外部へ開放させた状態とすることができるため、レーザー溶接する際、溶接対象である露出部３２、具体的には、キャップ２６の外周部(固定部２６ｂの拡径部２６ｎと嵌合部２６ｐが連続する部分)と、円筒部位２ｐの内周縁部(内周面と端面２ｂが連続する部分)を捉え易く、溶接作業を容易かつスムーズに行うことができる。
さらに、このように露出部３２を広角に開放することで、当該露出部３２に対して溶接棒などの溶接材を補っての肉盛り溶接も容易に行うことができる。これにより、露出部３２をより強固に接合させることができ、キャップ２６の静止輪２からの脱落、異物の侵入や潤滑剤の漏洩をより一層確実に防止することが可能となる。 Then, until the outer peripheral edge of the portion where the enlarged diameter portion 26n of the fixing portion 26b and the fitting portion 26p are continuous comes into contact with the inner peripheral edge portion (the portion where the inner peripheral surface and the end surface 2b are continuous) of the cylindrical portion 2p. It is press-fitted into the stationary wheel 2 and is fixed to the stationary wheel 2 by fitting the entire outer peripheral part of the fitting part 26p with the inner peripheral part of the cylindrical part 2p.
As a result, the portion (exposed portion 32) where the fitting portion 26p of the fixing portion 26b and the fitting portion of the cylindrical portion 2p are exposed to the outside of the unit is the end face of the enlarged diameter portion 26n of the fixing portion 26b and the cylindrical portion 2p. It is exposed to the outside of the unit at an angle formed by 2b. That is, the exposed portion 32 is exposed to the outside of the unit at an obtuse angle (for example, a wide angle of about 120 °) substantially the same as the continuous angle between the enlarged diameter portion 26n and the bottom portion 26a.
Therefore, since the exposed portion 32 can be widely opened to the outside of the unit, when laser welding is performed, the exposed portion 32 to be welded, specifically, the outer peripheral portion of the cap 26 (the expanded portion of the fixed portion 26b). The portion where the diameter portion 26n and the fitting portion 26p are continuous) and the inner peripheral edge portion (the portion where the inner peripheral surface and the end surface 2b are continuous) of the cylindrical portion 2p can be easily captured, and the welding operation can be performed easily and smoothly.
Furthermore, by opening the exposed portion 32 to a wide angle in this way, build-up welding can be easily performed by supplementing the exposed portion 32 with a welding material such as a welding rod. Thereby, the exposed part 32 can be joined more firmly, and it becomes possible to prevent the cap 26 from dropping from the stationary wheel 2, the intrusion of foreign matter, and the leakage of the lubricant more reliably.

(第８実施形態)
本実施形態は、キャップ２６の静止輪２からの脱落、異物の侵入や潤滑剤の漏洩などを、キャップ２６と静止輪２(円筒部位２ｐ)の嵌合部分への弾性体２８の介在、及び凹凸形状(溝部２ｆと突出部２６ｋ)による係合構造の適用によって防止するとともに、かかる嵌合部分に対するレーザー溶接によっても防止する形態である。
本実施形態に係るキャップ２６の構成の一例を図１３に示す。この場合、上述した第４実施形態(図７)において、キャップ２６と静止輪２(円筒部位２ｐ)との嵌合部分のうち、固定部２６ｂの折り返し部２６ｃと円筒部位２ｐの端面２ｂの嵌合部分がユニット外部へ露出される部位(露出部３２)に対してレーザー溶接を施している。具体的には、図１３に示すように、キャップ２６の外周部(折り返し部２６ｃが底部２６ａと連続する部分のアウトボード側)と、円筒部位２ｐの外周縁部(外周面と端面２ｂが連続する部分(面取り部２ｃ))との間をレーザー溶接により接合し、閉塞している。
なお、本実施形態においては、図１３に示すように、固定部２６ｂの円筒部２６ｊに対し、全周に亘ってゴム製の弾性体２８が連結されており、当該弾性体２８が円筒部２６ｊと円筒部位２ｐの内周部との間、すなわち露出部３２の近傍に介在された状態となっている。レーザー溶接は、溶接時における温度上昇範囲が狭いため、溶接対象となる露出部３２の近傍にゴム製の弾性体２８が配設されている場合であっても、特段の問題(例えば、温度上昇による弾性体２８の変形や劣化など)を生じさせることなく、溶接作業を行うことができる。 (Eighth embodiment)
In the present embodiment, the cap 26 is removed from the stationary wheel 2, the intrusion of foreign matter, the leakage of the lubricant, etc., the interposition of the elastic body 28 in the fitting portion between the cap 26 and the stationary wheel 2 (cylindrical part 2 p), and This is a form which is prevented by applying an engagement structure with the uneven shape (the groove 2f and the protrusion 26k) and also prevented by laser welding on the fitting portion.
An example of the configuration of the cap 26 according to this embodiment is shown in FIG. In this case, in the above-described fourth embodiment (FIG. 7), among the fitting parts between the cap 26 and the stationary ring 2 (cylindrical part 2p), the folded part 26c of the fixing part 26b and the end surface 2b of the cylindrical part 2p are fitted. Laser welding is performed on a portion where the joint portion is exposed to the outside of the unit (exposed portion 32). Specifically, as shown in FIG. 13, the outer periphery of the cap 26 (outboard side where the folded portion 26c continues to the bottom 26a) and the outer periphery of the cylindrical portion 2p (the outer periphery and the end surface 2b are continuous). (The chamfered portion 2c)) is joined and closed by laser welding.
In the present embodiment, as shown in FIG. 13, a rubber elastic body 28 is connected to the cylindrical portion 26j of the fixed portion 26b over the entire circumference, and the elastic body 28 is connected to the cylindrical portion 26j. And the inner peripheral portion of the cylindrical portion 2p, that is, in the vicinity of the exposed portion 32. Laser welding has a narrow temperature rise range during welding, so even if a rubber elastic body 28 is disposed in the vicinity of the exposed portion 32 to be welded, a special problem (for example, temperature rise) The welding operation can be performed without causing deformation or deterioration of the elastic body 28 due to the above.

また、本実施形態においては、かかるレーザー溶接を上記弾性体２８の介在及び係合構造と併用することによって、キャップ２６の静止輪２からの脱落、異物の侵入や潤滑剤の漏洩などをより確実に防止する構成としている。一般的に、レーザー溶接した部分(本実施形態においては、露出部３２)は耐衝撃性が低下し易く、例えば、ハブユニット軸受Ａに対して過大な衝撃が加わった場合などにおいて、レーザー溶接部分(露出部３２)が破断してしまうことも想定されるが、このような場合であっても、キャップ２６と静止輪２(円筒部位２ｐ)の嵌合部分へ介在させた弾性体２８、さらには、凹凸形状(溝部２ｆと突出部２６ｋ)による係合構造によって、キャップ２６の脱落、異物の侵入や潤滑剤の漏洩などを有効に防止することができる。
このため、露出部３２に対するレーザー溶接は、当該露出部３２の周方向数箇所のみを溶接により接合するスポット溶接であって構わない。ただし、露出部３２を全周に亘ってレーザー溶接により接合し、当該露出部３２を全周に亘って完全に閉塞させることにより、さらに優れた異物侵入防止効果などを奏することが可能となる。 In this embodiment, the laser welding is used in combination with the interposition and engagement structure of the elastic body 28, thereby more reliably preventing the cap 26 from dropping from the stationary wheel 2, the entry of foreign matter, the leakage of the lubricant, and the like. It is configured to prevent it. Generally, the laser welded portion (exposed portion 32 in the present embodiment) is likely to have a reduced impact resistance. For example, when an excessive impact is applied to the hub unit bearing A, the laser welded portion Although it is assumed that the (exposed portion 32) is broken, even in such a case, the elastic body 28 interposed in the fitting portion between the cap 26 and the stationary ring 2 (cylindrical portion 2p), and Can effectively prevent the cap 26 from falling off, the intrusion of foreign matter, the leakage of the lubricant, and the like by the engagement structure with the concavo-convex shape (the groove portion 2f and the protruding portion 26k).
For this reason, the laser welding with respect to the exposed portion 32 may be spot welding in which only a few places in the circumferential direction of the exposed portion 32 are joined by welding. However, by bonding the exposed portion 32 over the entire circumference by laser welding and completely closing the exposed portion 32 over the entire circumference, it is possible to achieve a further excellent foreign matter intrusion preventing effect and the like.

なお、本実施形態においては、上述した第４実施形態に対して所定のレーザー溶接を施す場合を一例として想定したが、これ以外の第１実施形態から第３実施形態、及び第５実施形態(所定の変形例を含む)(図２から図６、図９及び図１０)に対して所定のレーザー溶接を施すことも可能である。例えば、キャップ２６と静止輪２の嵌合部分がユニット外部へ露出される部位を有する形態(第５実施形態及びその変形例(図９及び図１０))に対しては、本実施形態とほぼ同様にレーザー溶接を施すことができる。   In the present embodiment, the case where predetermined laser welding is performed on the above-described fourth embodiment is assumed as an example. However, the first to third embodiments and the fifth embodiment other than the above are assumed. It is also possible to perform predetermined laser welding on (including predetermined modifications) (FIGS. 2 to 6, 9, and 10). For example, for a form having a portion where the fitting portion of the cap 26 and the stationary ring 2 is exposed to the outside of the unit (fifth embodiment and its modifications (FIGS. 9 and 10)), it is almost the same as this embodiment Similarly, laser welding can be performed.

以上、第１実施形態から第８実施形態(所定の変形例を含む)(図２から図１３)によれば、キャップ２６を静止輪２(円筒部位２ｐ)に対して嵌合固定させるとともに、その嵌合部分へ弾性体２８を介在させること、凹凸形状(溝部２ｆと突出部２６ｋや突条２８ｂ)を係合させること、あるいは、前記嵌合部分の露出部３２をレーザー溶接により接合することで、キャップ２６の静止輪２に対する密着性を高め、静止輪２からのキャップ２６の脱落を確実に防止することができるとともに、キャップ２６の静止輪２に対する静止安定性を確実に高めることができる。そして、上記嵌合部分からの異物(例えば、泥水や塵埃など)の侵入、及びユニット内部に封入された潤滑剤(例えば、グリースや潤滑油など)の外部への漏洩の防止を図ることができる。   As described above, according to the first to eighth embodiments (including predetermined modifications) (FIGS. 2 to 13), the cap 26 is fitted and fixed to the stationary wheel 2 (cylindrical portion 2p), and Interposing the elastic body 28 in the fitting portion, engaging the concavo-convex shape (the groove 2f and the protruding portion 26k or the protrusion 28b), or joining the exposed portion 32 of the fitting portion by laser welding. Thus, the adhesion of the cap 26 to the stationary wheel 2 can be increased, the cap 26 can be prevented from dropping off from the stationary wheel 2, and the stationary stability of the cap 26 to the stationary wheel 2 can be reliably increased. . Further, it is possible to prevent foreign matters (for example, muddy water and dust) from entering the fitting portion and leakage of lubricant (for example, grease and lubricating oil) enclosed in the unit to the outside. .

また、上述した第１実施形態から第８実施形態(所定の変形例を含む)(図２から図１３)においては、キャップ２６について静止輪２に対する固定構造(嵌合構造)の改良を図ることを想定したが、軌道輪(静止輪２や回転輪４)との固定部分(嵌合部分)を有するその他の密封装置、例えば、非接触型のシールド(いわゆるスリンガ)やシール芯金などについても、かかる嵌合部分への弾性体の介在、凹凸形状による係合、レーザー溶接の各手段を講じることで、キャップ２６と同様の作用効果を得ることが可能である。   In the above-described first to eighth embodiments (including predetermined modifications) (FIGS. 2 to 13), improvement of the fixing structure (fitting structure) of the cap 26 with respect to the stationary wheel 2 is intended. However, other sealing devices having a fixed part (fitting part) with the raceway (stationary wheel 2 or rotating wheel 4), such as a non-contact type shield (so-called slinger) or seal metal The same effects as those of the cap 26 can be obtained by providing each means of interposition of the elastic body in the fitting portion, engagement by the uneven shape, and laser welding.

２ 静止輪
２ｆ 静止輪溝部
４ 回転輪
１２ ハブ
１６ 内輪構成体
１８ 転動体
２６ 密封装置(キャップ)
２６ａ キャップ底部
２６ｂ キャップ固定部
２６ｋ キャップ突出部
２８ 弾性体
２８ｂ 弾性体突条
３２ 露出部
Ａ 車輪支持用転がり軸受ユニット(ハブユニット軸受) 2 stationary wheel 2f stationary wheel groove part 4 rotating wheel 12 hub 16 inner ring component 18 rolling element 26 sealing device (cap)
26a Cap bottom portion 26b Cap fixing portion 26k Cap projection portion 28 Elastic body 28b Elastic body protrusion 32 Exposed portion A Rolling bearing unit for wheel support (hub unit bearing)

Claims (3)

車体構成部材に固定されて非回転状態に維持される静止輪と、当該静止輪に対向配置され、車輪構成部材を固定して当該車輪構成部材とともに回転する回転輪と、これらの静止輪及び回転輪にそれぞれ形成されて相互に対向する軌道溝間へ転動可能に組み込まれた複数の転動体とを備えた車輪支持用転がり軸受ユニットにおいて、ユニットの内部を外部から封止して密封状態に保つための密封装置であって、
前記密封装置は、前記ユニットの軸方向の一方側端部を覆う底部と、当該底部の周縁部に連続して成形され、前記静止輪へ固定するための固定部を備えており、
前記固定部には、その外周部及び内周部の少なくとも一方に対し、前記静止輪の固定部位との間に介在されるように弾性材で成形された弾性体が連結されていることを特徴とする転がり軸受ユニットの密封装置。 A stationary wheel that is fixed to the vehicle body component and maintained in a non-rotating state, a rotating wheel that is disposed opposite to the stationary wheel and that rotates with the wheel component member while fixing the wheel component member, and these stationary wheels and rotation A rolling bearing unit for supporting a wheel provided with a plurality of rolling elements formed on a ring and capable of rolling between race grooves facing each other, and the inside of the unit is sealed from the outside to be sealed. A sealing device for keeping,
The sealing device includes a bottom portion that covers one end portion in the axial direction of the unit, a peripheral portion of the bottom portion, and a fixing portion that is fixed to the stationary wheel.
The fixing portion is connected to an elastic body formed of an elastic material so as to be interposed between the fixing portion of the stationary wheel and at least one of the outer peripheral portion and the inner peripheral portion. Sealing device for rolling bearing unit. 車体構成部材に固定されて非回転状態に維持される静止輪と、当該静止輪に対向配置され、車輪構成部材を固定して当該車輪構成部材とともに回転する回転輪と、これらの静止輪及び回転輪にそれぞれ形成されて相互に対向する軌道溝間へ転動可能に組み込まれた複数の転動体とを備えた車輪支持用転がり軸受ユニットにおいて、ユニットの内部を外部から封止して密封状態に保つための密封装置であって、
前記密封装置は、前記ユニットの軸方向の一方側端部を覆う略円板状の底部と、当該底部の周縁部に連続して成形され、前記静止輪へ固定するための固定部を備えており、
前記静止輪には、前記固定部の固定部位となる前記回転輪との対向周面を凹状に窪ませてなる溝部が全周に亘って連続して形成され、
前記固定部には、前記静止輪の溝部と係合可能な突出部が配設されており、当該突出部は、当該固定部の前記静止輪との対向周部を全周に亘って連続して凸状に突出させて形成されており、
前記突出部を前記溝部と係合させた際の係合部分が前記底部及び前記固定部によって前記ユニットの外部から閉塞されることを特徴とする転がり軸受ユニットの密封装置。 A stationary wheel that is fixed to the vehicle body component and maintained in a non-rotating state, a rotating wheel that is disposed opposite to the stationary wheel and that rotates with the wheel component member while fixing the wheel component member, and these stationary wheels and rotation A rolling bearing unit for supporting a wheel provided with a plurality of rolling elements formed on a ring and capable of rolling between race grooves facing each other, and the inside of the unit is sealed from the outside to be sealed. A sealing device for keeping,
The sealing device includes a substantially disk-shaped bottom portion that covers one end portion in the axial direction of the unit, and a fixing portion that is continuously formed on a peripheral portion of the bottom portion and is fixed to the stationary wheel. And
In the stationary wheel, a groove portion is formed continuously over the entire circumference by recessing a circumferential surface facing the rotating wheel which is a fixing portion of the fixing portion,
The fixed portion is provided with a protrusion that can be engaged with the groove portion of the stationary wheel, and the protruding portion is continuous over the entire circumference of the fixed portion facing the stationary wheel. And projecting in a convex shape,
A sealing device for a rolling bearing unit, wherein an engaging portion when the projecting portion is engaged with the groove portion is closed from the outside of the unit by the bottom portion and the fixing portion. 車体構成部材に固定されて非回転状態に維持される静止輪と、当該静止輪に対向配置され、車輪構成部材を固定して当該車輪構成部材とともに回転する回転輪と、これらの静止輪及び回転輪にそれぞれ形成されて相互に対向する軌道溝間へ転動可能に組み込まれた複数の転動体とを備えた車輪支持用転がり軸受ユニットにおいて、
ユニットの内部を外部から封止して密封状態に保つための密封装置であって、
前記密封装置は、前記ユニットの軸方向の一方側端部を覆う底部と、当該底部の周縁部に連続して成形され、前記静止輪へ固定するための固定部を備えており、
前記固定部は、前記静止輪との固定部位のうち、前記ユニットの外部へ露出される部位がレーザー溶接によって当該静止輪に対して接合されることを特徴とする転がり軸受ユニットの密封装置。 A stationary wheel that is fixed to the vehicle body component and maintained in a non-rotating state, a rotating wheel that is disposed opposite to the stationary wheel and that rotates with the wheel component member while fixing the wheel component member, and these stationary wheels and rotation A rolling bearing unit for supporting a wheel provided with a plurality of rolling elements formed so as to be able to roll between raceway grooves which are formed on the respective rings and face each other;
A sealing device for sealing the inside of the unit from the outside to keep it sealed.
The sealing device includes a bottom portion that covers one end portion in the axial direction of the unit, a peripheral portion of the bottom portion, and a fixing portion that is fixed to the stationary wheel.
The fixing device is a sealing device for a rolling bearing unit, wherein a portion exposed to the outside of the unit among fixed portions to the stationary wheel is joined to the stationary wheel by laser welding.
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