JP2015175407A - wheel bearing device - Google Patents

wheel bearing device Download PDF

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Publication number
JP2015175407A
JP2015175407A JP2014051034A JP2014051034A JP2015175407A JP 2015175407 A JP2015175407 A JP 2015175407A JP 2014051034 A JP2014051034 A JP 2014051034A JP 2014051034 A JP2014051034 A JP 2014051034A JP 2015175407 A JP2015175407 A JP 2015175407A
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Prior art keywords
drain
cap
bearing device
wheel bearing
hole
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JP6320092B2 (en
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祐志郎 小野
Yujiro Ono
祐志郎 小野
田窪 孝康
Takayasu Takubo
孝康 田窪
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72Sealings
    • F16C33/723Shaft end sealing means, e.g. cup-shaped caps or covers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14Bearings 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
    • F16C19/18Bearings 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
    • F16C19/181Bearings 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
    • F16C19/183Bearings 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
    • F16C19/184Bearings 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
    • F16C19/186Bearings 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00Articles relating to transporting
    • F16C2326/01Parts of vehicles in general
    • F16C2326/02Wheel hubs or castors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007Encoders, e.g. parts with a plurality of alternating magnetic poles

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

Abstract

PROBLEM TO BE SOLVED: To provide a wheel bearing device which prevents the intrusion of foreign matters into a cap, easily discharges the foreign matters even if the foreign matters intrude therein, and is improved in reliability.SOLUTION: A wheel bearing device comprises: a cylindrical fitting part 16a in which a sensor cap 16 is formed into a cap shape, and which is fit to an end internal periphery of an outer member 2; a flange part 16b which extends to the outside of a radial direction from the fitting part while overlapping with the fitting part, and closely adheres to an end face 2d of the outer member 2; and a bottom part 16d which blocks an opening part of the outer member 2 via a cylinder part 16c. A swollen part 27 is protrusively formed at a road face side at the outside of the radial direction of the bottom part 16d, a drain 26 is formed in the vicinity of a corner with the cylinder part 16c of the swollen part 27, a peripheral edge of a water drain hole 26a is formed while protruding to an axial direction so as to hang out to the outside, the intrusion of foreign matters such as muddy water and pebbles scattering from a vertical direction with respect to the drain 26 can be thereby prevented, and the swollen part serves as a weir against the muddy water which flows in along the bottom part 16c.

Description

本発明は、自動車等の車輪を懸架装置に対して回転自在に支承する車輪用軸受装置、特に、車輪の回転速度を検出する回転速度センサが装着される車輪用軸受装置に関するものである。   The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like with respect to a suspension device, and more particularly to a wheel bearing device to which a rotation speed sensor for detecting the rotation speed of a wheel is attached.

自動車の車輪を懸架装置に対して回転自在に支承すると共に、アンチロックブレーキシステム(ABS)を制御し、車輪の回転速度を検出する回転速度検出装置が内蔵された車輪用軸受装置が一般的に知られている。従来、このような車輪用軸受装置は、転動体を介して転接する内方部材および外方部材の間にシール装置が設けられ、円周方向に磁極を交互に並べてなる磁気エンコーダを前記シール装置に一体化させると共に、磁気エンコーダと、この磁気エンコーダに対面配置され、車輪の回転に伴う磁気エンコーダの磁極変化を検出する回転速度センサとで回転速度検出装置が構成されている。   In general, a wheel bearing device in which a wheel of an automobile is rotatably supported with respect to a suspension device and an anti-lock brake system (ABS) is controlled to detect a rotation speed of the wheel is incorporated. Are known. Conventionally, in such a wheel bearing device, a sealing device is provided between an inner member and an outer member that are in rolling contact with a rolling element, and a magnetic encoder in which magnetic poles are alternately arranged in a circumferential direction is provided as the sealing device. In addition, the rotational speed detecting device is constituted by a magnetic encoder and a rotational speed sensor that is arranged facing the magnetic encoder and detects a magnetic pole change of the magnetic encoder accompanying the rotation of the wheel.

前記回転速度センサは、懸架装置を構成するナックルに車輪用軸受装置が装着された後、当該ナックルに装着されているものが一般的である。しかし、この回転速度センサと磁気エンコーダとのエアギャップの調整作業の煩雑さを解消すると共に、よりコンパクト化を狙って、最近では回転速度センサをも装着される車輪用軸受装置が提案されている。   In general, the rotational speed sensor is attached to the knuckle after the wheel bearing device is attached to the knuckle constituting the suspension device. However, in order to eliminate the complexity of adjusting the air gap between the rotational speed sensor and the magnetic encoder and to make it more compact, a wheel bearing device to which a rotational speed sensor is also attached has recently been proposed. .

このような車輪用軸受装置の一例として図6に示すような構造が知られている。この車輪用軸受装置は、内方部材51と外方部材52、および両部材51、52間に転動自在に収容された複列のボール53、53とを備えている。内方部材51は、ハブ輪54と、このハブ輪54に圧入された内輪55とからなる。   As an example of such a wheel bearing device, a structure as shown in FIG. 6 is known. This wheel bearing device includes an inner member 51, an outer member 52, and double-row balls 53, 53 accommodated between the members 51, 52 so as to roll freely. The inner member 51 includes a hub ring 54 and an inner ring 55 press-fitted into the hub ring 54.

ハブ輪54は、一端部に車輪(図示せず)を取り付けるための車輪取付フランジ56を一体に有し、外周に一方の内側転走面54aと、この内側転走面54aから軸方向に延びる小径段部54bが形成されている。車輪取付フランジ56にはハブボルト56aが周方向等配に植設されている。   The hub wheel 54 integrally has a wheel mounting flange 56 for mounting a wheel (not shown) at one end, and has an inner rolling surface 54a on the outer periphery and an axial direction extending from the inner rolling surface 54a. A small diameter step 54b is formed. Hub bolts 56a are planted on the wheel mounting flange 56 at equal intervals in the circumferential direction.

内輪55は、外周に他方の内側転走面55aが形成され、ハブ輪54の小径段部54bに圧入されると共に、小径段部54bの端部を塑性変形させて形成した加締部54cによってハブ輪54に対して軸方向に固定されている。   The inner ring 55 is formed with the other inner rolling surface 55a on the outer periphery, press-fitted into the small-diameter step portion 54b of the hub ring 54, and a caulking portion 54c formed by plastically deforming the end portion of the small-diameter step portion 54b. It is fixed in the axial direction with respect to the hub wheel 54.

外方部材52は、外周にナックル59に取り付けられるための車体取付フランジ52bを一体に有し、この車体取付フランジ52bのインナー側にナックル59に嵌合される円筒状のパイロット部52cが形成され、内周にハブ輪54の内側転走面54aに対向する外側転走面52aと、内輪55の内側転走面55aに対向する外側転走面52aが一体に形成されている。これら両転走面間に複列のボール53、53が収容され、保持器57、57によって転動自在に保持されている。そして、外方部材52と内方部材51との間に形成される環状空間のアウター側の開口部にシール58が装着されると共に、インナー側の開口部には内側キャップ60が装着され、軸受内部に封入されたグリースの外部への漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。   The outer member 52 integrally has a vehicle body mounting flange 52b to be attached to the knuckle 59 on the outer periphery, and a cylindrical pilot portion 52c fitted to the knuckle 59 is formed on the inner side of the vehicle body mounting flange 52b. The outer raceway surface 52a that faces the inner raceway surface 54a of the hub wheel 54 and the outer raceway surface 52a that faces the inner raceway surface 55a of the inner race 55 are integrally formed on the inner periphery. Double-row balls 53 and 53 are accommodated between these rolling surfaces, and are held by rollers 57 and 57 so as to be freely rollable. A seal 58 is attached to the opening on the outer side of the annular space formed between the outer member 52 and the inner member 51, and an inner cap 60 is attached to the opening on the inner side. This prevents leakage of grease sealed inside and prevents rainwater and dust from entering the bearing from the outside.

内輪55の外周にはパルサリング61が圧入され、円環状に形成された支持環62と、この支持環62の側面に加硫接着等で一体に接合された磁気エンコーダ63とで構成されている。   A pulsar ring 61 is press-fitted into the outer periphery of the inner ring 55, and includes a support ring 62 formed in an annular shape, and a magnetic encoder 63 integrally joined to a side surface of the support ring 62 by vulcanization adhesion or the like.

外方部材52の端部に内側キャップ60が装着され、外方部材52の開口部を閉塞している。この内側キャップ60はステンレス鋼板からプレス加工によってカップ状に形成され、外方部材52の端部内周に圧入される円筒状の嵌合部60aと、この嵌合部60aから縮径部60bを介して磁気エンコーダ63に軸方向すきまを介して対峙する円板部60cと、この円板部60cから膨出する屈曲部60dを介して内方部材51の端部を覆う底部60eを備えている。   An inner cap 60 is attached to the end of the outer member 52 and closes the opening of the outer member 52. The inner cap 60 is formed into a cup shape by press working from a stainless steel plate, and is fitted into a cylindrical fitting portion 60a that is press-fitted into the inner periphery of the end of the outer member 52, and from the fitting portion 60a through a reduced diameter portion 60b. In addition, a disc portion 60c that faces the magnetic encoder 63 via an axial clearance and a bottom portion 60e that covers an end portion of the inner member 51 via a bent portion 60d that bulges from the disc portion 60c.

内側キャップ60の軸受外方側には、さらに外側キャップ(センサキャップ)64が装着されている。この外側キャップ64は鋼板からプレス加工によってカップ状に形成され、外方部材52の端部内周に圧入される円筒状の嵌合部64aと、この嵌合部64aから径方向外方に重合して延び、外方部材52の端面52dに密着する鍔部64bと、この鍔部64bから円筒部64cを介して外方部材52の開口部を閉塞する底部64dとを備えている。そして、外側キャップ64の底部64dには磁気エンコーダ63に対応する水平位置に嵌挿孔65が形成され、この嵌挿孔65に回転速度センサ66が嵌挿される。この回転速度センサ66は内側キャップ60の円板部60cに衝合または近接するまで挿入されている。   An outer cap (sensor cap) 64 is further mounted on the bearing outer side of the inner cap 60. The outer cap 64 is formed into a cup shape by pressing from a steel plate, and is overlapped with a cylindrical fitting portion 64a that is press-fitted into the inner periphery of the end of the outer member 52, and radially outward from the fitting portion 64a. And a bottom portion 64d that closes the opening of the outer member 52 from the flange portion 64b through the cylindrical portion 64c. An insertion hole 65 is formed in the bottom 64 d of the outer cap 64 at a horizontal position corresponding to the magnetic encoder 63, and the rotation speed sensor 66 is inserted into the insertion hole 65. The rotational speed sensor 66 is inserted until it contacts or approaches the disc portion 60c of the inner cap 60.

また、外側キャップ64の底部64dの径方向外方側の路面に近い側に突出して膨出部67が形成され、図7(a)に示すように、ドレーン68が円筒部64cの膨出部67に近い部位に径方向に貫通して形成されている。これにより、ナックル59が外方部材52の端面52dと面一ではなく、軸受外方側に突出している場合、外側キャップ64の膨出部67側にドレーン68が形成されていることにより、外側キャップ64内に外部から雨水等の異物が浸入したとしても、膨出部67部分に流動落下し、ナックル59に妨害されることなくドレーン68から外部へ容易に排出することができる。   Further, a bulging portion 67 is formed so as to protrude to the side close to the road surface on the radially outer side of the bottom portion 64d of the outer cap 64, and as shown in FIG. 7A, the drain 68 is a bulging portion of the cylindrical portion 64c. A portion close to 67 is formed so as to penetrate in the radial direction. Thus, when the knuckle 59 is not flush with the end surface 52d of the outer member 52 but protrudes outward of the bearing, the drain 68 is formed on the bulging portion 67 side of the outer cap 64, so that the outer side Even if foreign matter such as rainwater enters the cap 64 from the outside, it can flow and drop into the bulging portion 67 and can be easily discharged from the drain 68 to the outside without being blocked by the knuckle 59.

また、図7(b)に示すようなドレーン69も提案されている。このドレーン69は矩形状に形成され、一辺を残して三辺にスリット69a、69b、69cがそれぞれ形成され、径方向内方(路面方向)に切り起こされている。そして、この切り起こし片が保護壁70となってドレーン69の開口部が閉塞されている。こうして形成された保護壁70によって、車両の走行中にタイヤで跳ね上げられた泥水や小石等の異物がドレーンの開口部から入り難くすることができる(例えば、特許文献1参照。)。   A drain 69 as shown in FIG. 7B has also been proposed. The drain 69 is formed in a rectangular shape, and slits 69a, 69b, and 69c are formed on three sides except for one side, and are cut and raised radially inward (road surface direction). And this cut-and-raised piece becomes the protective wall 70, and the opening part of the drain 69 is obstruct | occluded. The protective wall 70 formed in this way makes it difficult for foreign matter such as muddy water and pebbles that are splashed up by the tire while the vehicle is traveling to enter from the opening of the drain (for example, see Patent Document 1).

特開2013−204652号公報JP 2013-204652 A

このような従来の車輪用軸受装置では、単なる貫通孔からなるドレーン67よりも保護壁70を有するドレーン69の方が異物侵入には有効である。然しながら、車両の走行中にタイヤから跳ね上げられる泥水や小石等の異物は、必ずしも一定の方向からではなく、ドレーン69に対して様々な方向から飛散することが考えられる。この場合、例え、保護壁70によってドレーン69の開口部が閉塞されていても、スリット69a、69b、69cから異物がドレーン69の開口部から侵入する恐れがある。   In such a conventional wheel bearing device, the drain 69 having the protective wall 70 is more effective for intrusion of foreign matter than the drain 67 consisting of a simple through hole. However, it is conceivable that foreign matters such as muddy water and pebbles that are splashed from the tires while the vehicle is traveling are scattered from various directions with respect to the drain 69, not necessarily from a certain direction. In this case, even if the opening of the drain 69 is blocked by the protective wall 70, foreign matter may enter from the opening of the drain 69 through the slits 69a, 69b, and 69c.

本発明は、このような従来の問題に鑑みてなされたもので、キャップの内部に異物が侵入するのを防止すると共に、例え、異物が侵入しても容易に排出し、信頼性の向上を図った車輪用軸受装置を提供することを目的とする。   The present invention has been made in view of such a conventional problem, and prevents foreign matter from entering the inside of the cap. For example, even if foreign matter enters, it is easily discharged to improve reliability. It is an object of the present invention to provide a wheel bearing device.

係る目的を達成すべく、本発明のうち請求項1に記載の発明は、内周に複列の外側転走面が形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入された少なくとも一つの内輪とからなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、前記外方部材と内方部材のそれぞれの転走面間に転動自在に収容された複列の転動体と、を備え、鋼板からカップ状に形成されたキャップが前記外方部材のインナー側の端部に圧入された車輪用軸受装置において、前記キャップが、前記外方部材のインナー側の端部に嵌合される円筒状の嵌合部と、円筒部を介して前記外方部材のインナー側の開口部を閉塞する底部を備え、この底部の径方向外方または前記円筒部の路面側にドレーンが形成され、このドレーンが、水抜き孔の周縁が外部側に張り出すように突出して形成されている。   In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member having a double row outer raceway formed on the inner periphery, and a wheel mounting flange for mounting a wheel at one end. And at least one inner ring press-fitted into the small-diameter step portion of the hub ring, the outer ring of the double row being rotated around the outer periphery. An inner member in which a double-row inner rolling surface facing the running surface is formed, and a double-row rolling element housed so as to be freely rollable between the respective rolling surfaces of the outer member and the inner member; A wheel bearing device in which a cap formed in a cup shape from a steel plate is press-fitted into the inner side end of the outer member, and the cap fits into the inner side end of the outer member. A cylindrical fitting portion to be joined, and an inner side of the outer member through the cylindrical portion. A bottom is provided to close the mouth, and a drain is formed radially outward of the bottom or on the road surface side of the cylindrical portion. The drain is formed so that the peripheral edge of the drain hole protrudes to the outside. ing.

このように、鋼板からカップ状に形成されたキャップが外方部材のインナー側の端部に圧入された車輪用軸受装置において、キャップが、外方部材のインナー側の端部に嵌合される円筒状の嵌合部と、円筒部を介して外方部材のインナー側の開口部を閉塞する底部を備え、この底部の径方向外方または円筒部の路面側にドレーンが形成され、このドレーンが、水抜き孔の周縁が外部側に張り出すように突出して形成されているので、ドレーンに対して垂直方向から飛散する泥水や小石等の異物の侵入を防ぐことができ、密封性の向上を図ると共に、キャップの内部に異物が侵入しても容易に排出でき、信頼性の向上を図った車輪用軸受装置を提供することができる。   Thus, in the wheel bearing device in which the cap formed in a cup shape from the steel plate is press-fitted into the inner side end of the outer member, the cap is fitted to the inner side end of the outer member. A cylindrical fitting portion and a bottom portion that closes the opening on the inner side of the outer member via the cylindrical portion are provided, and a drain is formed on the outer side in the radial direction of the bottom portion or on the road surface side of the cylindrical portion. However, it is formed so that the peripheral edge of the drain hole protrudes to the outside, so that it is possible to prevent intrusion of foreign matter such as muddy water and pebbles scattered from the vertical direction with respect to the drain, and improved sealing performance In addition, it is possible to provide a wheel bearing device that can be easily discharged even if foreign matter enters the inside of the cap, thereby improving reliability.

好ましくは、請求項2に記載の発明のように、前記ドレーンが、前記キャップの底部に軸方向に突出して設けられていれば、ドレーンに対して垂直方向から飛散する泥水や小石等の異物の侵入を防ぐことができると共に、底部を伝って流動してきた泥水に対して堰となり、ドレーンからの泥水等の浸入を防止することができる。   Preferably, as in the invention described in claim 2, if the drain is provided so as to protrude in the axial direction at the bottom of the cap, foreign matter such as muddy water and pebbles scattered from a direction perpendicular to the drain. Intrusion can be prevented, and it becomes a weir with respect to the muddy water that has flowed through the bottom, and the intrusion of muddy water and the like from the drain can be prevented.

また、請求項3に記載の発明のように、前記キャップの円筒部の内径が前記嵌合部の内径よりも大径に形成されると共に、前記ドレーンの水抜き孔の最下面が、少なくとも前記嵌合部の内径よりも大径に設定されていれば、水抜き孔の最下面と嵌合部との間に段差が形成され、キャップ内に浸入した泥水等が円筒部の底部に残留することなく排出される。   Further, as in the invention according to claim 3, the inner diameter of the cylindrical portion of the cap is formed larger than the inner diameter of the fitting portion, and the lowermost surface of the drain hole of the drain is at least the If the diameter is set larger than the inner diameter of the fitting portion, a step is formed between the bottom surface of the drain hole and the fitting portion, and muddy water or the like that has entered the cap remains at the bottom of the cylindrical portion. It is discharged without.

また、請求項4に記載の発明のように、前記キャップの前記ドレーンの近傍に遮蔽板が接合され、この遮蔽板によって当該ドレーンの水抜き孔の開口部が覆われていれば、ドレーンの開口部が直接外部から見えなくなり、外部からの泥水や小石等の侵入防止効果を高めることができる。   Further, as in the invention described in claim 4, if a shielding plate is joined in the vicinity of the drain of the cap and the opening of the drain hole of the drain is covered by the shielding plate, the opening of the drain The portion is not directly visible from the outside, and the effect of preventing intrusion of muddy water and pebbles from the outside can be enhanced.

また、請求項5に記載の発明のように、前記キャップの円筒部の内径が前記嵌合部の内径よりも大径に形成されると共に、前記ドレーンが前記キャップの円筒部に径方向に突出して設けられていれば、ドレーンと嵌合部との間に段差が形成され、キャップ内に浸入した泥水等が円筒部の底部に残留することなく容易に排出される。   According to a fifth aspect of the present invention, the inner diameter of the cylindrical portion of the cap is formed larger than the inner diameter of the fitting portion, and the drain protrudes radially from the cylindrical portion of the cap. Are provided, a step is formed between the drain and the fitting portion, and muddy water or the like that has entered the cap is easily discharged without remaining at the bottom of the cylindrical portion.

また、請求項6に記載の発明のように、前記キャップに貫通孔が穿設され、この貫通孔に前記ドレーンが別体として固定されていれば、ドレーンとして様々な材質を選択することができて設計自由度が高くなると共に、ドレーン自体を複雑な構造に形成することができ、外部からの泥水や小石等の侵入防止効果を高めることができる。   Further, as in the invention described in claim 6, if a through hole is formed in the cap and the drain is fixed separately to the through hole, various materials can be selected as the drain. As a result, the degree of freedom in design can be increased, and the drain itself can be formed in a complicated structure, thereby enhancing the effect of preventing intrusion of muddy water and pebbles from the outside.

また、請求項7に記載の発明のように、前記ドレーンがL字状に形成され、前記キャップの貫通孔に嵌合される円環状の嵌合部と、この嵌合部から路面方向に垂下する排出部を備えていれば、貫通孔が直接外部から見えない構造とすることができ、外部からの泥水や小石等の侵入防止効果を高めることができる。   According to a seventh aspect of the present invention, the drain is formed in an L shape and is fitted in the through-hole of the cap, and is suspended from the fitting portion in the road surface direction. If the discharge part to be equipped is provided, it can be set as the structure which cannot see a through-hole directly from the outside, and the penetration | invasion prevention effect, such as a muddy water and a pebble from the outside, can be heightened.

また、請求項8に記載の発明のように、前記ドレーンが、前記キャップの貫通孔に嵌合される円環状の嵌合部を備える金属製とされ、前記ドレーンの水抜き孔の開口部を拡径させて当該ドレーンが前記貫通孔に加締固定されていれば、ドレーンが強固に固定されると共に、水抜き孔の先端形状がテーパ状になり、外部側の開口部が内部側よりも小さく設定できるので、キャップに浸入した泥水等が容易に排出できると共に、外部から異物が侵入し難くすることができる。   Further, as in the invention described in claim 8, the drain is made of metal having an annular fitting portion fitted into the through-hole of the cap, and the drain opening of the drain is provided with an opening. If the drain is expanded and the drain is caulked and fixed to the through hole, the drain is firmly fixed, the tip of the drain hole is tapered, and the opening on the outside is more than the inner side. Since it can be set small, muddy water or the like that has entered the cap can be easily discharged, and foreign matter can be prevented from entering from the outside.

また、請求項9に記載の発明のように、前記ドレーンが円環状の金属製とされ、前記キャップの貫通孔の開口部に溶接により一体に接合されていても良いし、請求項10に記載の発明のように、前記ドレーンが合成樹脂製とされ、前記キャップの貫通孔にインサート成形により一体に接合されていても良い。これにより、貫通孔やドレーンの寸法精度を高めなくてもドレーンが強固に固定されると共に、圧入等の固定作業を簡素化することができ、低コスト化を図ることができる。   Further, as in the ninth aspect of the present invention, the drain may be made of an annular metal, and may be integrally joined to the opening of the through hole of the cap by welding. As in the invention, the drain may be made of synthetic resin and integrally joined to the through hole of the cap by insert molding. Accordingly, the drain can be firmly fixed without increasing the dimensional accuracy of the through hole and the drain, and the fixing work such as press-fitting can be simplified, and the cost can be reduced.

また、請求項11に記載の発明のように、前記内輪に、円周方向に特性を交互に、かつ等間隔に変化させたパルサリングが外嵌され、前記キャップに回転速度センサが装着されると共に、前記キャップの軸受内方側に内側キャップが配設され、この内側キャップが非磁性のオーステナイト系ステンレス鋼板から形成され、前記外方部材の端部内周に圧入される円筒状の嵌合部と、この嵌合部から径方向内方に延び、前記パルサリングに僅かな軸方向すきまを介して対峙する円板部を備え、この円板部に前記回転速度センサが衝合または近接され、前記内側キャップを介して前記パルサリングに対向配置されていれば、密封性の向上を図ることができ、長期間に亘って速度検出の精度を維持し、ABSの信頼性を高めることができる。   Further, as in the invention described in claim 11, the inner ring is fitted with a pulsar ring whose characteristics are alternately changed at equal intervals in the circumferential direction, and a rotational speed sensor is mounted on the cap. An inner cap is disposed on the bearing inner side of the cap, the inner cap is formed of a nonmagnetic austenitic stainless steel plate, and is fitted into a cylindrical fitting portion press-fitted into the inner periphery of the end of the outer member; And a disk portion extending radially inward from the fitting portion and facing the pulsar ring via a slight axial clearance, and the rotational speed sensor is abutted or approached to the disk portion, If it is arranged opposite to the pulsar ring via the cap, the sealing performance can be improved, the accuracy of speed detection can be maintained over a long period of time, and the reliability of the ABS can be improved.

本発明に係る車輪用軸受装置は、内周に複列の外側転走面が形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入された少なくとも一つの内輪とからなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、前記外方部材と内方部材のそれぞれの転走面間に転動自在に収容された複列の転動体と、を備え、鋼板からカップ状に形成されたキャップが前記外方部材のインナー側の端部に圧入された車輪用軸受装置において、前記キャップが、前記外方部材のインナー側の端部に嵌合される円筒状の嵌合部と、円筒部を介して前記外方部材のインナー側の開口部を閉塞する底部を備え、この底部の径方向外方または前記円筒部の路面側にドレーンが形成され、このドレーンが、水抜き孔の周縁が外部側に張り出すように突出して形成されているので、ドレーンに対して垂直方向から飛散する泥水や小石等の異物の侵入を防ぐことができ、密封性の向上を図ると共に、キャップの内部に異物が侵入しても容易に排出でき、信頼性の向上を図った車輪用軸受装置を提供することができる。   The wheel bearing device according to the present invention integrally includes an outer member having a double row outer raceway formed on the inner periphery, and a wheel mounting flange for mounting the wheel on one end, and an axial direction on the outer periphery. A hub ring formed with a small-diameter step portion extending in the direction and at least one inner ring press-fitted into the small-diameter step portion of the hub ring, and the outer periphery of the double row facing the outer rolling surface of the double row on the outer periphery. An inner member on which a running surface is formed, and a double-row rolling element that is movably accommodated between the rolling surfaces of the outer member and the inner member, and is formed in a cup shape from a steel plate. In the wheel bearing device in which the cap is press-fitted into the inner side end of the outer member, the cap is fitted into a cylindrical fitting portion to be fitted to the inner side end of the outer member; A bottom portion for closing the opening on the inner side of the outer member through the cylindrical portion, A drain is formed on the outer side in the radial direction of the bottom of the cylinder or on the road surface side of the cylindrical part, and this drain is formed so as to protrude so that the peripheral edge of the drain hole protrudes to the outside. For wheels that can prevent intrusion of foreign matter such as muddy water and pebbles scattered from the direction, improve sealing performance, and easily discharge even if foreign matter enters inside the cap, improving reliability A bearing device can be provided.

本発明に係る車輪用軸受装置の一実施形態を示す縦断面図である。It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. 図1の検出部を示す要部拡大図である。It is a principal part enlarged view which shows the detection part of FIG. (a)は、図1の内側キャップ単体を示す縦断面図、(b)は、図1の外側キャップ単体を示す縦断面図である。(A) is a longitudinal cross-sectional view which shows the inner cap single-piece | unit of FIG. 1, (b) is a longitudinal cross-sectional view which shows the outer cap single-piece | unit of FIG. (a)は、図3(b)のドレーンの変形例を示す要部拡大図、(b)は、(a)のドレーンの変形例を示す要部拡大図、(c)は、(a)のドレーンの他の変形例を示す要部拡大図である。(A) is a principal part enlarged view showing a modification of the drain of FIG. 3 (b), (b) is a principal part enlarged view showing a modification of the drain of (a), and (c) is (a). It is a principal part enlarged view which shows the other modification of this drain. (a)は、図3(b)のドレーンの他の変形例を示す要部拡大図、(b)は、(a)のドレーンの変形例を示す要部拡大図、(c)は、(a)のドレーンの他の変形例を示す要部拡大図、(d)は、(a)のドレーンの他の変形例を示す要部拡大図、(e)は、(a)のドレーンの他の変形例を示す要部拡大図である。(A) is an enlarged view of a main part showing another modification of the drain of FIG. 3 (b), (b) is an enlarged view of a main part showing a modification of the drain of (a), and (c) is ( (a) Main part enlarged view showing another modified example of the drain, (d) is an enlarged main part showing another modified example of the drain of (a), (e) is other than the drain of (a). It is a principal part enlarged view which shows the modification of this. 従来の車輪用軸受装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. (a)は、図6のドレーン部を示す要部拡大図、(b)は、(a)のドレーンの変形例を示す要部拡大図である。(A) is a principal part enlarged view which shows the drain part of FIG. 6, (b) is a principal part enlarged view which shows the modification of the drain of (a).

外周に車体に取り付けられるための車体取付フランジを一体に有し、内周に複列の外側転走面が一体に形成された外方部材と、一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に前記複列の外側転走面の一方に対向する内側転走面と、この内側転走面から軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入され、前記複列の外側転走面の他方に対向する内側転走面が形成された内輪からなる内方部材と、前記外方部材と内方部材のそれぞれの転走面間に転動自在に収容された複列の転動体と、前記内輪に外嵌された磁気エンコーダと、記外方部材のインナー側の端部に圧入され、回転速度センサが装着される鋼板からプレス加工により形成されたカップ状のセンサキャップを備え、前記回転速度センサが前記磁気エンコーダに軸方向エアギャップを介して対峙される車輪用軸受装置において、前記センサキャップが、前記外方部材のインナー側の端部に嵌合される円筒状の嵌合部と、この嵌合部から径方向外方に重合して延び、前記外方部材のインナー側の端面に密着する鍔部と、この鍔部から円筒部を介して前記外方部材のインナー側の開口部を閉塞する底部を備え、この底部の径方向外方の路面側に膨出部がインナー側に突出して形成されると共に、この膨出部の前記円筒部との角部に近い部位にドレーンが形成され、このドレーンが、水抜き孔の周縁が外部側に張り出すように軸方向に突出して形成されている。   An outer member integrally having a vehicle body mounting flange to be attached to the vehicle body on the outer periphery, a double row outer rolling surface formed integrally on the inner periphery, and a wheel mounting flange for mounting a wheel on one end A hub wheel integrally formed and having an inner rolling surface facing one of the outer rolling surfaces of the double row on the outer periphery, and a small-diameter step portion extending in the axial direction from the inner rolling surface, and the hub wheel An inner member formed of an inner ring press-fitted into a small-diameter step portion and formed with an inner rolling surface facing the other of the double row outer rolling surfaces, and the rolling of each of the outer member and the inner member. A steel plate to which a rotational speed sensor is mounted by being press-fitted into an inner side end of the outer member, a double row rolling element housed in a freely movable manner between the faces, a magnetic encoder fitted on the inner ring, and an outer member And a cup-shaped sensor cap formed by press working. In a wheel bearing device in which a speed sensor is opposed to the magnetic encoder via an axial air gap, the sensor cap includes a cylindrical fitting portion that is fitted to an inner side end of the outer member; A flange part that overlaps and extends radially outward from the fitting part and is in close contact with the inner end face of the outer member, and an opening on the inner side of the outer member from the flange part through the cylindrical part A bulging portion is formed on the radially outward road surface side of the bottom portion so as to protrude toward the inner side, and a drain is provided near a corner portion of the bulging portion with the cylindrical portion. The drain is formed so as to protrude in the axial direction so that the peripheral edge of the drain hole protrudes to the outside.

以下、本発明の実施の形態を図面に基づいて詳細に説明する。
図1は、本発明に係る車輪用軸受装置の一実施形態を示す縦断面図、図2は、図1の検出部を示す要部拡大図、図3(a)は、図1の内側キャップ単体を示す縦断面図、(b)は、図1の外側キャップ単体を示す縦断面図、図4(a)は、図3(b)のドレーンの変形例を示す要部拡大図、(b)は、(a)のドレーンの変形例を示す要部拡大図、(c)は、(a)のドレーンの他の変形例を示す要部拡大図、図5(a)は、図3(b)のドレーンの他の変形例を示す要部拡大図、(b)は、(a)のドレーンの変形例を示す要部拡大図、(c)は、(a)のドレーンの他の変形例を示す要部拡大図、(d)は、(a)のドレーンの他の変形例を示す要部拡大図、(e)は、(a)のドレーンの他の変形例を示す要部拡大図である。なお、以下の説明では、車両に組み付けた状態で車両の外側寄りとなる側をアウター側(図1の左側)、中央寄り側をインナー側(図1の右側)という。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, FIG. 2 is an enlarged view of a main part showing a detection unit of FIG. 1, and FIG. 3 (a) is an inner cap of FIG. FIG. 4B is a longitudinal sectional view showing a single outer cap of FIG. 1, FIG. 4A is an enlarged view of a main part showing a modification of the drain of FIG. ) Is an enlarged view of the main part showing a modification of the drain of (a), (c) is an enlarged view of the main part showing another modification of the drain of (a), and FIG. The main part enlarged view which shows the other modification of the drain of b), (b) is the principal part enlarged view which shows the modification of the drain of (a), (c) is another deformation | transformation of the drain of (a). (D) is an enlarged view of the main part showing another modification of the drain of (a), and (e) is an enlarged view of the main part showing another modification of the drain of (a). FIG. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

図1に示す車輪用軸受装置は従動輪側の第3世代と呼称され、内方部材1と外方部材2、および両部材1、2間に転動自在に収容された複列の転動体(ボール)3、3とを備えている。内方部材1は、ハブ輪4と、このハブ輪4に所定のシメシロを介して圧入された内輪5とからなる。   The wheel bearing device shown in FIG. 1 is referred to as the third generation on the driven wheel side, and is a double row rolling element that is accommodated so as to roll freely between the inner member 1 and the outer member 2, and both members 1 and 2. (Balls) 3 and 3. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4 through a predetermined shimiro.

ハブ輪4は、アウター側の端部に車輪(図示せず)を取り付けるための車輪取付フランジ6を一体に有し、外周に一方(アウター側)の内側転走面4aと、この内側転走面4aから軸方向に延びる小径段部4bが形成されている。車輪取付フランジ6にはハブボルト6aが周方向等配に植設されている。   The hub wheel 4 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outer side, and has one (outer side) inner rolling surface 4a on the outer periphery and the inner rolling surface. A small diameter step 4b extending in the axial direction from the surface 4a is formed. Hub bolts 6a are planted on the wheel mounting flange 6 at equal intervals in the circumferential direction.

内輪5は、外周に他方(インナー側)の内側転走面5aが形成され、ハブ輪4の小径段部4bに圧入されると共に、小径段部4bの端部を塑性変形させて形成した加締部4cによって所定の軸受予圧が付与された状態で、ハブ輪4に対して軸方向に固定されている。これにより、軽量・コンパクト化を図ることができる。なお、内輪5はSUJ2等の高炭素クロム鋼で形成され、ズブ焼入れによって芯部まで58〜64HRCの範囲に硬化処理されている。また、転動体3、3は、内輪5と同様、SUJ2等の高炭素クロム鋼で形成され、ズブ焼入れによって芯部まで62〜67HRCの範囲に硬化処理されている。   The inner ring 5 is formed by forming the other (inner side) inner rolling surface 5a on the outer periphery, press-fitted into the small-diameter step portion 4b of the hub wheel 4, and plastically deforming the end portion of the small-diameter step portion 4b. It is fixed in the axial direction with respect to the hub wheel 4 in a state where a predetermined bearing preload is applied by the tightening portion 4c. Thereby, weight reduction and size reduction can be achieved. The inner ring 5 is made of high carbon chrome steel such as SUJ2, and is hardened in the range of 58 to 64 HRC up to the core part by quenching. The rolling elements 3 and 3 are formed of high carbon chrome steel such as SUJ2 as in the case of the inner ring 5, and are hardened in the range of 62 to 67HRC to the core portion by quenching.

ハブ輪4はS53C等の炭素0.40〜0.80wt%を含む中高炭素鋼で形成され、内側転走面4aをはじめ、後述するシール8のシールランド部となる車輪取付フランジ6のインナー側の基部6bから小径段部4bに亙って高周波焼入れによって表面硬さを58〜64HRCの範囲に硬化処理されている。なお、加締部4cは鍛造加工後の表面硬さの生のままとされている。これにより、車輪取付フランジ6に負荷される回転曲げ荷重に対して充分な機械的強度を有し、内輪5の嵌合部となる小径段部4bの耐フレッティング性が向上すると共に、微小なクラック等の発生がなく加締部4cの塑性加工をスムーズに行うことができる。   The hub wheel 4 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes an inner rolling surface 4a and an inner side of a wheel mounting flange 6 serving as a seal land portion of a seal 8 described later. The surface hardness is hardened to a range of 58 to 64 HRC by induction hardening from the base 6b to the small diameter step 4b. Note that the caulking portion 4c is left with a raw surface hardness after forging. Thereby, it has sufficient mechanical strength with respect to the rotational bending load applied to the wheel mounting flange 6, the fretting resistance of the small-diameter step portion 4b serving as the fitting portion of the inner ring 5 is improved, and the minute There is no occurrence of cracks and the like, and the plastic working of the caulking portion 4c can be performed smoothly.

外方部材2は、外周にナックル9に取り付けられるための車体取付フランジ2bを一体に有し、この車体取付フランジ2bのインナー側にナックル9に嵌合される円筒状のパイロット部2cが形成され、内周にハブ輪4の内側転走面4aに対向するアウター側の外側転走面2aと、内輪5の内側転走面5aに対向するインナー側の外側転走面2aが一体に形成されている。これら両転走面間に複列の転動体3、3が収容され、保持器7、7によって転動自在に保持されている。そして、外方部材2と内方部材1との間に形成される環状空間のアウター側の開口部にシール8が装着されると共に、インナー側の開口部には後述する内側キャップ15が装着され、軸受内部に封入されたグリースの外部への漏洩と、外部から雨水やダスト等が軸受内部に侵入するのを防止している。   The outer member 2 integrally has a vehicle body mounting flange 2b to be attached to the knuckle 9 on the outer periphery, and a cylindrical pilot portion 2c fitted to the knuckle 9 is formed on the inner side of the vehicle body mounting flange 2b. The outer outer rolling surface 2a facing the inner rolling surface 4a of the hub wheel 4 and the inner outer rolling surface 2a facing the inner rolling surface 5a of the inner ring 5 are integrally formed on the inner periphery. ing. Double-row rolling elements 3 and 3 are accommodated between these rolling surfaces and are held by the cages 7 and 7 so as to be freely rollable. A seal 8 is attached to the opening on the outer side of the annular space formed between the outer member 2 and the inner member 1, and an inner cap 15 described later is attached to the opening on the inner side. This prevents the grease sealed inside the bearing from leaking to the outside and prevents rainwater and dust from entering the bearing from the outside.

外方部材2はハブ輪4と同様、S53C等の炭素0.40〜0.80wt%を含む中高炭素鋼で形成され、少なくとも複列の外側転走面2a、2aが高周波焼入れによって表面硬さを58〜64HRCの範囲に硬化処理されている。   Similar to the hub wheel 4, the outer member 2 is formed of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and at least the double row outer raceway surfaces 2a and 2a have surface hardness by induction hardening. Is cured in the range of 58 to 64 HRC.

シール8は、外方部材2のアウター側の端部内周に圧入された芯金10と、この芯金10に加硫接着によって一体に接合されたシール部材11とからなる一体型シールで構成されている。芯金10は、オーステナイト系ステンレス鋼板(JIS規格のSUS304系等)や冷間圧延鋼板(JIS規格のSPCC系等)からプレス加工にて断面が略L字状に形成されている。一方、シール部材11はNBR(アクリロニトリル−ブタジエンゴム)等の合成ゴムからなり、断面円弧状に形成された基部6bの外周面に摺接するサイドリップ11aとダストリップ11bおよびグリースリップ11cを有している。そして、芯金10の外表面を覆うように、シール部材11が回り込んで接合され、所謂ハーフメタル構造をなしている。これにより、気密性を高めて軸受内部を保護することができる。   The seal 8 is constituted by an integral seal composed of a cored bar 10 press-fitted into the inner periphery of the outer end of the outer member 2 and a seal member 11 integrally joined to the cored bar 10 by vulcanization adhesion. ing. The metal core 10 has a substantially L-shaped cross section by press working from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a cold rolled steel plate (JIS standard SPCC type or the like). On the other hand, the seal member 11 is made of synthetic rubber such as NBR (acrylonitrile-butadiene rubber) and has a side lip 11a, a dust lip 11b, and a grease lip 11c that are in sliding contact with the outer peripheral surface of the base portion 6b formed in an arcuate cross section. Yes. And the sealing member 11 wraps around and joins so that the outer surface of the metal core 10 may be covered, and what is called a half metal structure is comprised. Thereby, airtightness can be improved and the inside of a bearing can be protected.

なお、シール部材11の材質としては、例示したNBR以外にも、例えば、耐熱性に優れたHNBR(水素化アクリロニトリル・ブタジエンゴム)、EPDM(エチレンプロピレンゴム)等をはじめ、耐熱性、耐薬品性に優れたACM(ポリアクリルゴム)、FKM(フッ素ゴム)、あるいはシリコンゴム等を例示することができる。   In addition to the exemplified NBR, the material of the seal member 11 includes, for example, HNBR (hydrogenated acrylonitrile butadiene rubber), EPDM (ethylene propylene rubber), etc. having excellent heat resistance, and heat resistance and chemical resistance. Examples thereof include ACM (polyacrylic rubber), FKM (fluororubber), and silicon rubber, which are excellent in the above.

なお、ここでは、転動体3、3にボールを使用した複列アンギュラ玉軸受で構成された車輪用軸受装置を例示したが、これに限らず、円錐ころを使用した複列円錐ころ軸受で構成されたものであっても良い。また、ハブ輪4に直接内側転走面4aが形成された第3世代構造の車輪用軸受装置を例示したが、これに限らず、例えば、図示はしないが、第1世代構造をはじめ、ハブ輪に一対の内輪が圧入された第2世代構造にキャップが嵌合されるものにも適用することができる。   In addition, although the wheel bearing apparatus comprised by the double row angular contact ball bearing which used the ball for the rolling elements 3 and 3 was illustrated here, it is not restricted to this but is comprised by the double row tapered roller bearing using a tapered roller It may be what was done. Further, the third-generation wheel bearing device in which the inner raceway surface 4a is directly formed on the hub wheel 4 is illustrated. However, the present invention is not limited to this. For example, although not shown, the first-generation structure and the hub are included. The present invention can also be applied to a structure in which a cap is fitted to a second generation structure in which a pair of inner rings are press-fitted into a ring.

本実施形態では、内輪5の外周にパルサリング12が圧入されている。このパルサリング12は、円環状に形成された支持環13と、この支持環13の側面に加硫接着等で一体に接合された磁気エンコーダ14とで構成されている。この磁気エンコーダ14は、ゴム等のエラストマにフェライト等の磁性体粉が混入され、周方向に交互に磁極N、Sが着磁されて車輪の回転速度検出用のロータリエンコーダを構成している。   In the present embodiment, the pulsar ring 12 is press-fitted into the outer periphery of the inner ring 5. The pulsar ring 12 includes a support ring 13 formed in an annular shape, and a magnetic encoder 14 that is integrally joined to a side surface of the support ring 13 by vulcanization adhesion or the like. This magnetic encoder 14 is a rotary encoder for detecting the rotational speed of a wheel by mixing magnetic powder such as ferrite in an elastomer such as rubber and magnetizing magnetic poles N and S alternately in the circumferential direction.

支持環13は強磁性体の鋼板、例えば、フェライト系のステンレス鋼板(JIS規格のSUS430系等)や防錆処理された冷間圧延鋼板からプレス加工によって断面略L字状に形成され、内輪5に圧入される円筒部13aと、この円筒部13aから径方向外方に延びる立板部13bとを有している。そして、この立板部13bのインナー側の側面に磁気エンコーダ14が接合されている(図2参照)。   The support ring 13 is formed into a substantially L-shaped cross section by pressing from a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 series or the like) or a rust-proof cold-rolled steel plate. And a standing plate portion 13b extending radially outward from the cylindrical portion 13a. The magnetic encoder 14 is joined to the inner side surface of the upright plate portion 13b (see FIG. 2).

ここで、外方部材2に内側キャップ15が装着され、外方部材2のインナー側の開口部を閉塞している。この内側キャップ15は、耐食性を有し、後述する回転速度センサ21の感知性能に悪影響を及ぼさないように、非磁性体のオーステナイト系ステンレス鋼板からプレス加工によってカップ状に形成され、外方部材2のインナー側の端部内周に圧入される円筒状の嵌合部15aと、この嵌合部15aから縮径部15bを介して磁気エンコーダ14に僅かな軸方向すきまを介して対峙する円板部15cと、この円板部15cからアウター側に膨出する屈曲部15dを介して内方部材(図示せず)のインナー側の端部を覆う底部15eを備えている(図3(a)参照)。   Here, the inner cap 15 is attached to the outer member 2 to close the opening on the inner side of the outer member 2. The inner cap 15 has corrosion resistance and is formed into a cup shape by pressing from a non-magnetic austenitic stainless steel plate so as not to adversely affect the sensing performance of the rotational speed sensor 21 described later. A cylindrical fitting portion 15a that is press-fitted into the inner periphery of the inner end of the disk, and a disk portion that faces the magnetic encoder 14 from the fitting portion 15a via the reduced diameter portion 15b via a slight axial clearance. 15c and a bottom portion 15e that covers an inner side end of an inner member (not shown) via a bent portion 15d that bulges outward from the disc portion 15c (see FIG. 3A). ).

内側キャップ15は、図2に拡大して示すように、縮径部15bにNBR等の合成ゴムからなる弾性部材18が加硫接着によって一体に接合されている。この弾性部材18は、内側キャップ15の円板部15cの側面からインナー側に突出して回転速度センサ21に干渉しないように接合され、嵌合部15aの外径より径方向外方に突出する環状突起18aを備えている。そして、この環状突起18aが内側キャップ15の嵌合時に外方部材2の内側嵌合面19に弾性変形して圧着され、ハーフメタル構造をなして嵌合部15aの気密性を高めている。   As shown in an enlarged view in FIG. 2, the inner cap 15 is integrally joined to the reduced diameter portion 15b by an elastic member 18 made of synthetic rubber such as NBR by vulcanization adhesion. The elastic member 18 protrudes inward from the side surface of the disk portion 15c of the inner cap 15 so as not to interfere with the rotational speed sensor 21, and is an annular shape protruding radially outward from the outer diameter of the fitting portion 15a. A protrusion 18a is provided. The annular protrusion 18a is elastically deformed and pressure-bonded to the inner fitting surface 19 of the outer member 2 when the inner cap 15 is fitted, thereby forming a half metal structure and improving the airtightness of the fitting portion 15a.

本実施形態では、内側キャップ15のインナー側に、さらに外側キャップ(センサキャップ)16が装着されている。具体的には、外方部材2の内側嵌合面19の開口部側(インナー側)に所定の段差19aを介して環状溝からなる外側嵌合面20が形成され、外側キャップ16はこの外側嵌合面20に所定のシメシロを介して圧入されている。これら内側嵌合面19と外側嵌合面20は、高周波焼入れによる熱処理工程の後、研削工程において、複列の外側転走面2a、2aと総型砥石によって同時研削されている。   In the present embodiment, an outer cap (sensor cap) 16 is further attached to the inner side of the inner cap 15. Specifically, an outer fitting surface 20 formed of an annular groove is formed on the opening side (inner side) of the inner fitting surface 19 of the outer member 2 via a predetermined step 19a, and the outer cap 16 is disposed outside the outer cap 16. The fitting surface 20 is press-fitted through a predetermined scissors. The inner fitting surface 19 and the outer fitting surface 20 are simultaneously ground by the double-row outer rolling surfaces 2a and 2a and the overall grindstone in the grinding step after the heat treatment step by induction hardening.

このように、内側嵌合面19と外側嵌合面20が、総型砥石によって複列の外側転走面2a、2aと同時研削されているので、各嵌合面19、20の真円度や同軸度等の精度が向上し、嵌合部の気密性が高くなると共に、同時研削によって加工工数を低減して低コスト化を図ることができる。また、内側嵌合面19のインナー側に段差19aを介して外側嵌合面20が形成されているので、内側キャップ15の圧入ストロークを最小限に抑えて組立作業性を向上させると共に、圧入工程での内側キャップ15の変形を防止することができ、製品の信頼性を向上させることができる。   Thus, since the inner fitting surface 19 and the outer fitting surface 20 are simultaneously ground with the double-row outer rolling surfaces 2a, 2a by the general-purpose grindstone, the roundness of each fitting surface 19, 20 is obtained. In addition, the accuracy such as the coaxiality is improved, the airtightness of the fitting portion is increased, and the number of processing steps can be reduced by simultaneous grinding to reduce the cost. In addition, since the outer fitting surface 20 is formed on the inner side of the inner fitting surface 19 via the step 19a, the press-fit stroke is improved while minimizing the press-fitting stroke of the inner cap 15, and the press-fitting process. The inner cap 15 can be prevented from being deformed, and the reliability of the product can be improved.

また、外側キャップ16は防錆処理された冷間圧延鋼板からプレス加工によってカップ状に形成され、図3(b)に示すように、外方部材2の外側嵌合面20に圧入される円筒状の嵌合部16aと、この嵌合部16aから径方向外方に重合して延び、外方部材2のインナー側の端面2dに密着する鍔部16bと、この鍔部16bから円筒部16cを介して外方部材2のインナー側の開口部を閉塞する底部16dとを備えている。   Further, the outer cap 16 is formed into a cup shape by press working from a rust-proof cold-rolled steel plate and is press-fitted into the outer fitting surface 20 of the outer member 2 as shown in FIG. A fitting portion 16a, a flange portion 16b that overlaps and extends radially outward from the fitting portion 16a, and is in close contact with the inner end face 2d of the outer member 2, and a cylindrical portion 16c from the flange portion 16b. And a bottom portion 16d that closes the opening on the inner side of the outer member 2.

外側キャップ16の底部16dには磁気エンコーダ14に対応する水平位置にバーリング加工によって嵌挿孔17が形成され、この嵌挿孔17に回転速度センサ21が嵌挿される。このように、外側キャップ16が外方部材2の端面2dに密着する鍔部16bを備えているので、剛性を高めて回転速度センサの位置決め精度を向上させることができると共に、嵌挿孔17が磁気エンコーダ14に対応する水平位置に形成され、この嵌挿孔17に回転速度センサ21が装着されていれば、車輪からの横方向荷重により外方部材2と内方部材1が相対的に傾いた状態においても、回転速度センサ21と磁気エンコーダ14とのエアギャップ変動を抑制することができ、安定した検出精度を得ることができると共に、バーリング加工によって嵌挿孔17が形成されているので、装着部の剛性が高くなって回転速度センサ21の安定した位置決め固定ができ、検出精度を一層高めることができる。   An insertion hole 17 is formed in the bottom portion 16 d of the outer cap 16 by burring at a horizontal position corresponding to the magnetic encoder 14, and the rotational speed sensor 21 is inserted into the insertion hole 17. Thus, since the outer cap 16 includes the flange portion 16b that is in close contact with the end surface 2d of the outer member 2, the rigidity can be increased and the positioning accuracy of the rotational speed sensor can be improved, and the insertion hole 17 can be provided. If the rotation speed sensor 21 is formed in a horizontal position corresponding to the magnetic encoder 14 and the fitting insertion hole 17 is mounted, the outer member 2 and the inner member 1 are relatively inclined by a lateral load from the wheel. Even in this state, fluctuations in the air gap between the rotation speed sensor 21 and the magnetic encoder 14 can be suppressed, stable detection accuracy can be obtained, and the insertion hole 17 is formed by burring. The rigidity of the mounting portion is increased, and the rotational speed sensor 21 can be stably positioned and fixed, and the detection accuracy can be further enhanced.

また、外側キャップ16の底部16dの中心側に形成された穿孔22には固定ナット23が加締加工により固定されている。この固定ナット23は外側キャップ16の底部16dの軸受内方側(アウター側)に加締固定されている。そして、外側キャップ16の嵌挿孔17に嵌挿された回転速度センサ21が、取付部材24を介して取付ボルト25を固定ナット23に締結することによって固定されている。このように、固定ナット23が外側キャップ16の底部16dの軸受内方側に固定されているため、取付ボルト25の締結により固定ナット23が底部16dの内側面に引き込まれ、簡便な固定ナット23の加締だけで脱落を防止することができる。なお、固定ナット23の固定方法は、例示した加締固定以外にも、例えば、溶接、接着、圧入等であっても良い。   A fixing nut 23 is fixed to the perforation 22 formed on the center side of the bottom 16d of the outer cap 16 by caulking. The fixing nut 23 is caulked and fixed to the bearing inner side (outer side) of the bottom portion 16 d of the outer cap 16. The rotational speed sensor 21 inserted into the insertion hole 17 of the outer cap 16 is fixed by fastening the mounting bolt 25 to the fixing nut 23 via the mounting member 24. Thus, since the fixing nut 23 is fixed to the bearing inward side of the bottom portion 16d of the outer cap 16, the fixing nut 23 is pulled into the inner surface of the bottom portion 16d by fastening the mounting bolt 25, and the simple fixing nut 23 Dropping can be prevented only by caulking. Note that the fixing method of the fixing nut 23 may be, for example, welding, adhesion, press-fitting, or the like other than the illustrated caulking and fixing.

回転速度センサ21は、ホール素子、磁気抵抗素子(MR素子)等、磁束の流れ方向に応じて特性を変化させる磁気検出素子およびこの磁気検出素子の出力波形を整える波形整形回路が組み込まれたIC等からなり、車輪の回転速度を検出してその回転数を制御する自動車のアンチロックブレーキシステムを構成している。そして、この回転速度センサ21が内側キャップ15の円板部15cに衝合または近接するまで挿入されている(図2参照)。これにより、所望のエアギャップが得られ、煩雑なエアギャップ調整を省いて組立作業性の向上が図れると共に、縮径部15bに合成ゴムからなる弾性部材18が設けられた内側キャップ15により軸受内部を密封することができ、密封性の向上を図った車輪用軸受装置を提供することができる。   The rotation speed sensor 21 is an IC incorporating a magnetic detection element such as a Hall element, a magnetoresistive element (MR element) or the like that changes characteristics according to the flow direction of magnetic flux and a waveform shaping circuit that adjusts the output waveform of the magnetic detection element. The anti-lock brake system of the motor vehicle which consists of these etc. and detects the rotational speed of a wheel and controls the rotation speed is comprised. And this rotational speed sensor 21 is inserted until it abuts on or approaches the disc portion 15c of the inner cap 15 (see FIG. 2). As a result, a desired air gap can be obtained, and it is possible to improve the assembly workability by omitting complicated air gap adjustment, and at the inside of the bearing by the inner cap 15 in which the elastic member 18 made of synthetic rubber is provided in the reduced diameter portion 15b. Thus, it is possible to provide a wheel bearing device with improved sealing performance.

前述した内側キャップ15の板厚t1は、外側キャップ16の板厚t2よりも薄く設定されている。具体的には、外側キャップ16の板厚t2が1.0〜1.5mmに対して、内側キャップ15の板厚t1が0.2〜1.0mmに設定されている。これにより、エアギャップを小さく設定することが可能になり、検出精度を高めることができる。また、軽量化を図ることができると共に、加工性を向上させて低コスト化を図ることができる。なお、この板厚t1が0.2mm未満では、内側キャップ15の形状を精度良く成形するのが難しくなると共に、1.0mmを超えると、エアギャップが大きくなって所望の磁気特性を得ることができず検出精度が低下する。   The plate thickness t1 of the inner cap 15 described above is set to be thinner than the plate thickness t2 of the outer cap 16. Specifically, the plate thickness t2 of the inner cap 15 is set to 0.2 to 1.0 mm while the plate thickness t2 of the outer cap 16 is set to 1.0 to 1.5 mm. As a result, the air gap can be set small, and the detection accuracy can be increased. Further, the weight can be reduced, and the workability can be improved to reduce the cost. If the plate thickness t1 is less than 0.2 mm, it is difficult to accurately shape the shape of the inner cap 15, and if it exceeds 1.0 mm, the air gap becomes large and desired magnetic characteristics can be obtained. This cannot be done and the detection accuracy is reduced.

ここで、図3(b)に示すように、外側キャップ16の底部16dの径方向外方側にドレーン26が形成されている。また、底部16dからインナー側に所定の寸法Lだけ突出して膨出部27が形成されている。ドレーン26は、底部16dの路面に近い側の膨出部27に形成されている。なお、このドレーン26は円筒部16cとの角部に近い部位に形成されるのが好ましい。   Here, as shown in FIG. 3B, a drain 26 is formed on the radially outer side of the bottom portion 16 d of the outer cap 16. Further, a bulging portion 27 is formed to protrude from the bottom portion 16d to the inner side by a predetermined dimension L. The drain 26 is formed in the bulging portion 27 on the side close to the road surface of the bottom portion 16d. In addition, it is preferable that this drain 26 is formed in the site | part close | similar to the corner | angular part with the cylindrical part 16c.

ドレーン26は、単純な円形の貫通孔ではなく、水抜き孔26aの周縁が外部側に張り出すようにバーリング加工によって軸方向に突出して形成されている。これにより、ドレーン26に対して垂直方向から飛散する泥水や小石等の異物の侵入を防ぐことができると共に、底部16dを伝って流動してきた泥水に対して堰となり、ドレーン26からの泥水等の浸入を防止することができる。したがって、検出精度と密封性の向上を図ると共に、センサキャップの内部に異物が侵入しても容易に排出でき、信頼性の向上を図った車輪用軸受装置を提供することができる。   The drain 26 is not a simple circular through hole, but is formed so as to protrude in the axial direction by burring so that the peripheral edge of the drain hole 26a protrudes to the outside. Thereby, intrusion of foreign matter such as muddy water and pebbles scattered from the vertical direction with respect to the drain 26 can be prevented, and the muddy water flowing along the bottom portion 16d becomes a weir, and muddy water from the drain 26 and the like. Intrusion can be prevented. Therefore, it is possible to provide a wheel bearing device that can improve detection accuracy and sealing performance, and can be easily discharged even if foreign matter enters the inside of the sensor cap, thereby improving reliability.

また、膨出部27は、ナックル9が外方部材2の端面2dと面一ではなく、外方部材2の端面2dからインナー側に突出している場合に有効である。すなわち、外側キャップ16内に外部から雨水等の異物が浸入したとしても、この膨出部27部分に流動落下し、ナックル9に妨害されることなく容易に異物を外部に排出することができる。   Further, the bulging portion 27 is effective when the knuckle 9 is not flush with the end surface 2d of the outer member 2 but protrudes from the end surface 2d of the outer member 2 to the inner side. That is, even if foreign matter such as rainwater enters the outer cap 16 from the outside, the foreign matter can flow down to the bulging portion 27 and be easily discharged outside without being disturbed by the knuckle 9.

図4(a)〜(c)にドレーン26の変形例を示す。(a)に示す外側キャップ29は、外方部材2の端部内周に圧入される円筒状の嵌合部16aと、この嵌合部16aから径方向外方に重合して延び、外方部材2のインナー側の端面2dに密着する鍔部29aと、この鍔部29aから円筒部29bを介して外方部材2のインナー側の開口部を閉塞する底部16dとを備えている。そして、ドレーン28は、前述した実施形態と同様、外側キャップ29の底部16dの径方向外方側の路面に近い側の膨出部27に軸方向に突出して形成されている。   4 (a) to 4 (c) show modified examples of the drain 26. FIG. The outer cap 29 shown in (a) is a cylindrical fitting portion 16a that is press-fitted into the inner periphery of the end portion of the outer member 2, and extends radially outward from the fitting portion 16a. 2 is provided with a flange portion 29a that is in close contact with the end surface 2d on the inner side, and a bottom portion 16d that closes the opening portion on the inner side of the outer member 2 from the flange portion 29a via the cylindrical portion 29b. The drain 28 is formed so as to protrude in the axial direction on the bulging portion 27 on the side close to the road surface on the radially outer side of the bottom portion 16d of the outer cap 29, as in the above-described embodiment.

円筒部29bの内径は、嵌合部16aよりも大径に形成され、この円筒部29bと膨出部27との角部に近い部位にドレーン28が形成されている。ドレーン28は、開口部の周縁が外部側に張り出すようにバーリング加工によって形成されると共に、ドレーン28の水抜き孔28aの最下面の内径φAが、少なくとも嵌合部16aの内径φBよりも大径に設定されている(φA>φB)。このように、φAとφBとの間に段差Cを形成することにより、外側キャップ29内に浸入した泥水等が円筒部29bの底部に残留することなく排出される。   An inner diameter of the cylindrical portion 29b is formed larger than that of the fitting portion 16a, and a drain 28 is formed at a portion close to a corner portion between the cylindrical portion 29b and the bulging portion 27. The drain 28 is formed by burring so that the periphery of the opening projects outward, and the inner diameter φA of the lowermost surface of the drain hole 28a of the drain 28 is at least larger than the inner diameter φB of the fitting portion 16a. The diameter is set (φA> φB). Thus, by forming the step C between φA and φB, the muddy water or the like that has entered the outer cap 29 is discharged without remaining at the bottom of the cylindrical portion 29b.

(b)に示すドレーン30は、外側キャップ31の膨出部32の径方向外方側に穿設された貫通孔33に別体として圧入固定されている。このドレーン30は、ステンレス鋼板や防錆処理された冷間圧延鋼板等からプレス加工にて断面円形で略L字状に形成され、貫通孔33に圧入される円環状の嵌合部30aと、この嵌合部30から路面方向に垂下する排出部30bからなり、嵌合部30aの外周に鍔部30cが一体に形成されている。そして、この鍔部30cが膨出部32の側面に当接するまでドレーン30が圧入されている。   The drain 30 shown in (b) is press-fitted and fixed as a separate body in a through-hole 33 formed on the radially outward side of the bulging portion 32 of the outer cap 31. The drain 30 is formed from a stainless steel plate, a cold-rolled steel plate that has been rust-proofed, or the like, formed into a substantially L shape with a circular cross-section by press working, and an annular fitting portion 30a that is press-fitted into the through-hole 33; The fitting portion 30 includes a discharge portion 30b that hangs down in the road surface direction, and a flange portion 30c is integrally formed on the outer periphery of the fitting portion 30a. The drain 30 is press-fitted until the flange portion 30 c comes into contact with the side surface of the bulging portion 32.

このように、ドレーン30が外側キャップ31とは別体に形成されているため、ドレーン30として様々な材質を選択することができて設計自由度が高くなると共に、貫通孔33が直接外部から見えない複雑な構造に形成でき、外部からの泥水や小石等の侵入防止効果を高めることができる。   As described above, since the drain 30 is formed separately from the outer cap 31, various materials can be selected as the drain 30 and the design freedom is increased, and the through hole 33 can be directly seen from the outside. It can be formed in a complicated structure, and the effect of preventing the entry of muddy water and pebbles from the outside can be enhanced.

(c)に示すドレーン26には、このドレーン26の水抜き孔26aの開口部を覆う遮蔽板26bが設けられている。遮蔽板26bは断面L字状に形成され、ドレーン26の近傍にスポット溶接によって膨出部27に接合されている。この遮蔽板26bにより、ドレーン26の先端開口部が直接外部から見えなくなり、外部からの泥水や小石等の侵入防止効果を高めることができる。   The drain 26 shown in (c) is provided with a shielding plate 26 b that covers the opening of the drain hole 26 a of the drain 26. The shielding plate 26b is formed in an L-shaped cross section and is joined to the bulging portion 27 in the vicinity of the drain 26 by spot welding. By this shielding plate 26b, the tip opening of the drain 26 is not directly visible from the outside, and the effect of preventing the entry of muddy water, pebbles and the like from the outside can be enhanced.

図5(a)に、前述した外側キャップ16の変形例を示す。この外側キャップ34は、防錆処理された冷間圧延鋼板からプレス加工によってカップ状に形成され、外方部材2のインナー側の端部内周に圧入される円筒状の嵌合部16aと、この嵌合部16aから径方向外方に重合して延び、外方部材2のインナー側の端面2dに密着する鍔部16bと、この鍔部16bから円筒部16cを介して外方部材2のインナー側の開口部を閉塞する底部16dとを備えている。なお、この外側キャップ34は、前述した外側キャップ16と、基本的にはドレーンの構成が異なるだけで、その他同一部品同一部位には同じ符号を付して詳細な説明を省略する。   FIG. 5A shows a modified example of the outer cap 16 described above. The outer cap 34 is formed into a cup shape by press working from a rust-proof cold-rolled steel plate, and is fitted into a cylindrical fitting portion 16a that is press-fitted into the inner periphery of the inner side end of the outer member 2. A flange portion 16b that overlaps and extends radially outward from the fitting portion 16a and closely contacts the end surface 2d on the inner side of the outer member 2, and an inner member of the outer member 2 from the flange portion 16b through the cylindrical portion 16c. And a bottom portion 16d for closing the opening on the side. The outer cap 34 basically differs from the outer cap 16 described above only in the drain configuration, and the same reference numerals are assigned to the same parts of the same parts, and detailed description thereof is omitted.

ドレーン35は、外側キャップ34における円筒部16cの膨出部27側の端部に形成された貫通孔36に別体として圧入固定されている。このドレーン35は、ステンレス鋼板や防錆処理された冷間圧延鋼板等からプレス加工にて円環状に形成され、外周に鍔部35aが一体に形成されている。そして、この鍔部35aが円筒部16cに当接するまでドレーン35が圧入されている。   The drain 35 is press-fitted and fixed as a separate body in a through hole 36 formed in the end portion of the cylindrical portion 16 c on the bulging portion 27 side of the outer cap 34. The drain 35 is formed in an annular shape by press working from a stainless steel plate, a cold-rolled steel plate that has been rust-proofed, and the flange portion 35a is integrally formed on the outer periphery. The drain 35 is press-fitted until the flange 35a comes into contact with the cylindrical portion 16c.

このように、ドレーン35が外側キャップ34と別体に形成され、径方向に突出して貫通孔36から張り出すように圧入されているため、複雑な構造に形成できると共に、ドレーン35に対して垂直方向から飛散する泥水や小石等の異物を防ぐことができ、ドレーン35からの泥水等の浸入を防止することができる。   As described above, the drain 35 is formed separately from the outer cap 34 and is press-fitted so as to protrude in the radial direction and protrude from the through hole 36. Therefore, the drain 35 can be formed in a complicated structure and is perpendicular to the drain 35. Foreign matter such as muddy water and pebbles scattered from the direction can be prevented, and intrusion of muddy water and the like from the drain 35 can be prevented.

本実施形態では、外側キャップ34にはカチオン電着塗装によって防錆皮膜が形成されている。ここで、防錆皮膜を外側キャップ34の全表面に形成しても良いが、低コスト化を図るために、具体的には、外方部材2の外側嵌合面20およびインナー側の端面2dとの当接部分に防錆皮膜が形成されている。なお、カチオン電着塗装は、正電極に対して、製品側を負電極として通電するものであるが、負電極に対して、製品側を正電極として通電するアニオン型の電着塗装であっても良い。このアニオン型の電着塗装の場合、塗装色の安定性や焼付温度を低く設定できる特徴を備えているが、この種の外側キャップ34においては、防錆力と密着力に優れた強力な塗装膜が形成できるエポキシ樹脂系等からなるカチオン電着塗装の方が好ましい。   In this embodiment, the outer cap 34 is formed with a rust preventive film by cationic electrodeposition coating. Here, the rust preventive film may be formed on the entire surface of the outer cap 34. However, in order to reduce the cost, specifically, the outer fitting surface 20 of the outer member 2 and the end surface 2d on the inner side. A rust preventive film is formed on the contact portion. The cationic electrodeposition coating is an anionic electrodeposition coating in which the product side is energized with the product side as the negative electrode while the positive electrode is energized with the product side as the positive electrode. Also good. This anion-type electrodeposition coating has the characteristics that the coating color stability and baking temperature can be set low, but this type of outer cap 34 has a strong coating with excellent rust prevention and adhesion. Cationic electrodeposition coating made of an epoxy resin system or the like that can form a film is preferred.

本実施形態では、カチオン電着塗装の下地処理(前処理)としてリン酸亜鉛処理が施されている。このリン酸亜鉛処理により素材となる鋼材の表面が化学反応で粗面化されるため、塗料の食い付きが良くなって付着性が向上する。さらに、リン酸亜鉛処理の後にシーラー処理が施されていても良い。このシーラーは、一種の金属表面処理剤であり、例えば、30秒〜2分程度の短時間の浸漬、あるいは、スプレー処理を行うことにより、化成皮膜を形成することができる、所謂化成処理で、優れた塗膜密着性が確保できると共に、素材の保護皮膜が形成でき、強固な防錆機能と導電性を発揮することができる。換言すると、カチオン電着塗装の下地処理としてリン酸亜鉛処理が施されると共に、その上にシーラー処理が施されることによってリン酸亜鉛皮膜の微細な表面の平滑化により塗料電着時の空気の巻き込みを防止することができる。この空気の巻き込みがあると、塗膜にクレータ(凹凸等の不均一な表面)等の表面欠陥が生じることがあり好ましくない。   In the present embodiment, zinc phosphate treatment is applied as a base treatment (pretreatment) for cationic electrodeposition coating. Since the surface of the steel material as a raw material is roughened by a chemical reaction by this zinc phosphate treatment, the bite of the paint is improved and the adhesion is improved. Further, a sealer treatment may be performed after the zinc phosphate treatment. This sealer is a kind of metal surface treatment agent, for example, a so-called chemical conversion treatment in which a chemical conversion film can be formed by performing immersion for a short time of about 30 seconds to 2 minutes, or spray treatment. Excellent film adhesion can be secured, and a protective film of the material can be formed, and a strong rust prevention function and conductivity can be exhibited. In other words, the zinc phosphate treatment is applied as a base treatment for the cationic electrodeposition coating, and the sealer treatment is performed thereon to smooth the fine surface of the zinc phosphate coating, thereby causing the air during paint electrodeposition. Can be prevented. If air is involved, surface defects such as craters (uneven surfaces such as irregularities) may occur in the coating film, which is not preferable.

このように、本実施形態では、外側キャップ34の外方部材2との当接部分にカチオン電着塗装からなる防錆皮膜が形成されると共に、カチオン電着塗装の下地処理としてリン酸亜鉛処理が施されているので、塗料の付着性が向上し、外方部材2への圧入時に防錆皮膜が容易に剥がれ落ちることなく、嵌合面の微小な凹凸を埋めて滑らかな表面を維持できると共に、外側キャップ34の嵌合部16aおよび鍔部16bが長期間に亘って発錆するのを防止することができ、外方部材2の外側嵌合面20および端面2dとの間で良好な気密性が得られる。   Thus, in this embodiment, a rust preventive film made of cationic electrodeposition coating is formed on the contact portion of the outer cap 34 with the outer member 2, and zinc phosphate treatment is used as a base treatment for the cationic electrodeposition coating. As the coating is applied, the adhesion of the paint is improved, and the rust preventive film is not easily peeled off when being pressed into the outer member 2, and the smooth surface can be maintained by filling in the minute irregularities of the fitting surface. At the same time, the fitting portion 16a and the flange portion 16b of the outer cap 34 can be prevented from rusting over a long period of time, which is favorable between the outer fitting surface 20 and the end surface 2d of the outer member 2. Airtightness is obtained.

図5(b)に変形例を示す。このドレーン35は、前述した実施形態と同様、外側キャップ37の円筒部37bの膨出部27側の端部に形成された貫通孔36に別体として圧入固定されている。外側キャップ37は、基本的には前述した外側キャップ34と鍔部16bと円筒部16cの構成が異なり、外方部材2の端部内周に圧入される円筒状の嵌合部16aと、この嵌合部16aから径方向外方に重合して延び、外方部材2のインナー側の端面2dに密着する鍔部37aと、この鍔部37aから円筒部37bを介して外方部材2のインナー側の開口部を閉塞する底部16dとを備えている。   FIG. 5B shows a modification. The drain 35 is press-fitted and fixed as a separate body in a through hole 36 formed at the end of the cylindrical portion 37b of the outer cap 37 on the bulging portion 27 side, as in the above-described embodiment. The outer cap 37 basically differs in the configuration of the outer cap 34, the flange portion 16b, and the cylindrical portion 16c described above, and a cylindrical fitting portion 16a that is press-fitted into the inner periphery of the end portion of the outer member 2, and this fitting. A flange portion 37a that overlaps and extends radially outward from the joint portion 16a and is in close contact with the inner side end surface 2d of the outer member 2, and an inner side of the outer member 2 from the flange portion 37a via the cylindrical portion 37b. And a bottom portion 16d for closing the opening.

ここで、円筒部37bの内径φDは、少なくとも嵌合部16aの内径φBよりも大径に形成されている(φD>φB)。このように、φDとφBとの間に段差を形成することにより、外側キャップ37内に浸入した泥水等が円筒部37bの底部に残留することなく容易に排出される。   Here, the inner diameter φD of the cylindrical portion 37b is formed to be larger than at least the inner diameter φB of the fitting portion 16a (φD> φB). Thus, by forming a step between φD and φB, the muddy water or the like that has entered the outer cap 37 is easily discharged without remaining at the bottom of the cylindrical portion 37b.

次に、(c)に前述した実施形態(図5(a))の変形例を示す。この実施形態は、基本的には、ドレーン35の構成が異なるだけで、その他同一部品同一部位には同じ符号を付して詳細な説明を省略する。   Next, a modified example of the above-described embodiment (FIG. 5A) is shown in FIG. In this embodiment, basically only the configuration of the drain 35 is different, and the same reference numerals are assigned to the same parts of the same parts, and the detailed description is omitted.

このドレーン38は、ステンレス鋼板や防錆処理された冷間圧延鋼板等からプレス加工にて円環状に形成され、鍔部35aが一体に形成されている。そして、外側キャップ34の円筒部16cの膨出部27側の端部に形成された貫通孔36に圧入されている。その後、ドレーン38の内部側開口部をポンチ等で拡径することにより、貫通孔36に加締固定されている。これにより、ドレーン38が強固に固定されると共に、水抜き孔38aの先端形状がテーパ状になり、外部側の開口部が内部側開口部よりも小さく設定できるので、外側キャップ34に浸入した泥水等が容易に排出できると共に、外部から異物が侵入し難くすることができる。   The drain 38 is formed in an annular shape by press working from a stainless steel plate, a cold-rolled steel plate treated with rust prevention, and the like 35a is integrally formed. And it press-fits into the through-hole 36 formed in the edge part by the side of the bulging part 27 of the cylindrical part 16c of the outer side cap 34. FIG. Thereafter, the inner side opening of the drain 38 is expanded by a punch or the like, and is fixed to the through hole 36 by caulking. Accordingly, the drain 38 is firmly fixed, the tip shape of the drain hole 38a is tapered, and the opening on the outside can be set smaller than the opening on the inside, so that the muddy water that has entered the outer cap 34 can be set. Etc. can be easily discharged, and foreign substances can be made difficult to enter from the outside.

(d)に示すドレーン39は、ステンレス鋼板や防錆処理された冷間圧延鋼板等からプレス加工にて円環状に形成され、端部外周に鍔部39aが一体に形成されている。そして、外側キャップ34の円筒部16cに形成された貫通孔36の開口部に溶接により一体に接合されている。これにより、貫通孔36やドレーン39の寸法精度を高めなくてもドレーン39が強固に固定されると共に、圧入等の固定作業を簡素化することができ、低コスト化を図ることができる。   The drain 39 shown in (d) is formed in an annular shape by pressing from a stainless steel plate, a cold-rolled steel plate that has been subjected to rust prevention treatment, and a flange 39a is integrally formed on the outer periphery of the end portion. And it is integrally joined to the opening part of the through-hole 36 formed in the cylindrical part 16c of the outer side cap 34 by welding. Accordingly, the drain 39 can be firmly fixed without increasing the dimensional accuracy of the through hole 36 and the drain 39, and fixing work such as press-fitting can be simplified, and the cost can be reduced.

(e)に示すドレーン40は、PA(ポリアミド)66等の熱可塑性合成樹脂をベースに、GF(グラスファイバー)等の強化材を適量含有させたものからなり、外側キャップ34の貫通孔36にインサート成形により一体に接合されている。これにより、貫通孔36やドレーン40の寸法精度を高めなくてもドレーン40が強固に固定されると共に、圧入等の固定作業が省略でき、低コスト化を図ることができる。   The drain 40 shown in (e) is made of a thermoplastic synthetic resin such as PA (polyamide) 66 and containing a suitable amount of reinforcing material such as GF (glass fiber). The drain 40 is formed in the through hole 36 of the outer cap 34. They are joined together by insert molding. Accordingly, the drain 40 can be firmly fixed without increasing the dimensional accuracy of the through hole 36 and the drain 40, and fixing work such as press-fitting can be omitted, thereby reducing the cost.

なお、ドレーン40の材質として、前述したPA66以外にもPA46をはじめ、PPA(ポリフタルアミド)、PBT(ポリブチレンテレフタレート)等の所謂エンジニアリングプラスチックと呼称される熱可塑性の合成樹脂やポリフェニレンサルファイド(PPS)、ポリエーテルエーテルケトン(PEEK)、ポリアミドイミド(PAI)等の所謂スーパーエンジニアリングプラスチックと呼称される熱可塑性の合成樹脂、あるいは、フェノール樹脂(PF)、エポキシ樹脂(EP)、ポリイミド樹脂(PI)等をベースにCF(カーボンファイバー)等の強化繊維を含有させたものでも良い。   In addition to the above-mentioned PA66, the material of the drain 40 includes PA46, thermoplastic synthetic resin called so-called engineering plastics such as PPA (polyphthalamide), PBT (polybutylene terephthalate), and polyphenylene sulfide (PPS). ), Polyether ether ketone (PEEK), polyamideimide (PAI) and other so-called super engineering plastics, or synthetic resins such as phenol resin (PF), epoxy resin (EP), polyimide resin (PI) Or the like containing a reinforcing fiber such as CF (carbon fiber).

以上、本発明の実施の形態について説明を行ったが、本発明はこうした実施の形態に何等限定されるものではなく、あくまで例示であって、本発明の要旨を逸脱しない範囲内において、さらに種々なる形態で実施し得ることは勿論のことであり、本発明の範囲は、特許請求の範囲の記載によって示され、さらに特許請求の範囲に記載の均等の意味、および範囲内のすべての変更を含む。   The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

本発明に係る車輪用軸受装置は、従動輪用で、転動体がボール、円錐ころ等、あらゆる構造の内輪回転タイプの車輪用軸受装置に適用することができる。   The wheel bearing device according to the present invention can be applied to an inner ring rotating type wheel bearing device of any structure such as a driven wheel and a rolling element of a ball, a tapered roller or the like.

1 内方部材
2 外方部材
2a 外側転走面
2b 車体取付フランジ
2c パイロット部
2d 外方部材のインナー側の端面
3 転動体
4 ハブ輪
4a、5a 内側転走面
4b 小径段部
4c 加締部
5 内輪
6 車輪取付フランジ
6a ハブボルト
6b 車輪取付フランジのインナー側の基部
7 保持器
8 シール
9 ナックル
10 芯金
11 シール部材
11a サイドリップ
11b ダストリップ
11c グリースリップ
12 パルサリング
13 支持環
13a、16c、29b 円筒部
13b 立板部
14 磁気エンコーダ
15 内側キャップ
15a、16a、30a 嵌合部
15b 縮径部
15c 円板部
15d 屈曲部
15e、16d 底部
16、29、31、34、37 外側キャップ
16b、29a、30c、35a、37a、39a 鍔部
17 嵌挿孔
18 弾性部材
18a 環状突起
19 内側嵌合面
19a 段差
20 外側嵌合面
21 回転速度センサ
22 穿孔
23 固定ナット
24 取付部材
25 取付ボルト
26、28、30、35、38、39、40 ドレーン
26a、28a、38a 水抜き孔
26b 遮蔽板
27、32 膨出部
30b 排出部
33、36 貫通孔
51 内方部材
52 外方部材
52a 外側転走面
52b 車体取付フランジ
52c パイロット部
52d 外方部材の端面
53 ボール
54 ハブ輪
54a、55a 内側転走面
54b 小径段部
54c 加締部
55 内輪
56 車輪取付フランジ
56a ハブボルト
57 保持器
58 シール
59 ナックル
60 内側キャップ
60a、64a 嵌合部
60b 縮径部
60c 円板部
60d 屈曲部
60e、64d 底部
61 パルサリング
62 支持環
63 磁気エンコーダ
64 外側キャップ
64b 鍔部
64c 円筒部
65 嵌挿孔
66 回転速度センサ
67 膨出部
68、69 ドレーン
69a、69b、69c スリット
70 保護壁
A 水抜き孔の最下面の内径
B センサキャップの嵌合部16aの内径
C ドレーンの水抜き孔の最下面の内径と嵌合部の内径との段差
D センサキャップの円筒部の内径
L センサキャップ膨出部の底部からの突出量
t1 内側キャップの板厚
t2 外側キャップの板厚
DESCRIPTION OF SYMBOLS 1 Inner member 2 Outer member 2a Outer rolling surface 2b Car body mounting flange 2c Pilot part 2d Inner side end surface 3 of outer member Rolling element 4 Hub wheel 4a, 5a Inner rolling surface 4b Small diameter step part 4c Clamping part 5 Inner ring 6 Wheel mounting flange 6a Hub bolt 6b Inner side base 7 of wheel mounting flange Cage 8 Seal 9 Knuckle 10 Core 11 Seal member 11a Side lip 11b Dustrip 11c Grease lip 12 Pulsar ring 13 Support rings 13a, 16c, 29b Cylindrical Part 13b Standing plate part 14 Magnetic encoder 15 Inner cap 15a, 16a, 30a Fitting part 15b Reduced diameter part 15c Disc part 15d Bending part 15e, 16d Bottom parts 16, 29, 31, 34, 37 Outer caps 16b, 29a, 30c , 35a, 37a, 39a flange 17 fitting insertion hole 18 elastic member 18a ring Protrusion 19 Inner fitting surface 19a Step 20 Outer fitting surface 21 Rotational speed sensor 22 Perforation 23 Fixing nut 24 Mounting member 25 Mounting bolts 26, 28, 30, 35, 38, 39, 40 Drains 26a, 28a, 38a Drain hole 26b Shield plate 27, 32 Swelling portion 30b Discharge portion 33, 36 Through hole 51 Inner member 52 Outer member 52a Outer rolling surface 52b Car body mounting flange 52c Pilot portion 52d End surface 53 of outer member Ball 54 Hub wheel 54a, 55a Inner rolling surface 54b Small diameter stepped portion 54c Caulking portion 55 Inner ring 56 Wheel mounting flange 56a Hub bolt 57 Cage 58 Seal 59 Knuckle 60 Inner cap 60a, 64a Fitting portion 60b Reduced diameter portion 60c Disc portion 60d Bending portion 60e, 64d bottom 61 pulsar ring 62 support ring 63 magnetic encoder 64 outer cap 64b collar 64c cylindrical part 65 fitting insertion hole 66 rotational speed sensor 67 bulging part 68, 69 drain 69a, 69b, 69c slit 70 protective wall A inner diameter B of the bottom surface of the drain hole B inner diameter of the fitting part 16a of the sensor cap C Step between the inner diameter of the bottom surface of the drain hole of the drain and the inner diameter of the fitting portion D Inner diameter of the cylindrical portion of the sensor cap L1 Projection amount from the bottom of the bulging portion of the sensor cap Thickness t2 of the inner cap T2 of the outer cap Thickness

Claims (11)

内周に複列の外側転走面が形成された外方部材と、
一端部に車輪を取り付けるための車輪取付フランジを一体に有し、外周に軸方向に延びる小径段部が形成されたハブ輪、およびこのハブ輪の小径段部に圧入された少なくとも一つの内輪とからなり、外周に前記複列の外側転走面に対向する複列の内側転走面が形成された内方部材と、
前記外方部材と内方部材のそれぞれの転走面間に転動自在に収容された複列の転動体と、を備え、
鋼板からカップ状に形成されたキャップが前記外方部材のインナー側の端部に圧入された車輪用軸受装置において、
前記キャップが、前記外方部材のインナー側の端部に嵌合される円筒状の嵌合部と、円筒部を介して前記外方部材のインナー側の開口部を閉塞する底部を備え、この底部の径方向外方または前記円筒部の路面側にドレーンが形成され、このドレーンが、水抜き孔の周縁が外部側に張り出すように突出して形成されていることを特徴とする車輪用軸受装置。
An outer member having a double row outer raceway formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end, and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring; An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery,
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the outer member and the inner member,
In the wheel bearing device in which a cap formed in a cup shape from a steel plate is press-fitted into an end portion on the inner side of the outer member,
The cap includes a cylindrical fitting portion that is fitted to an inner side end of the outer member, and a bottom portion that closes the inner side opening of the outer member via the cylindrical portion. A wheel bearing characterized in that a drain is formed on a radially outer side of the bottom portion or on a road surface side of the cylindrical portion, and the drain protrudes so that a peripheral edge of a drain hole projects outward. apparatus.
前記ドレーンが、前記キャップの底部に軸方向に突出して設けられている請求項1に記載の車輪用軸受装置。   The wheel bearing device according to claim 1, wherein the drain is provided so as to protrude in an axial direction at a bottom portion of the cap. 前記キャップの円筒部の内径が前記嵌合部の内径よりも大径に形成されると共に、前記ドレーンの水抜き孔の最下面が、少なくとも前記嵌合部の内径よりも大径に設定されている請求項2に記載の車輪用軸受装置。   The inner diameter of the cylindrical portion of the cap is formed larger than the inner diameter of the fitting portion, and the lowermost surface of the drain hole of the drain is set to be larger than at least the inner diameter of the fitting portion. The wheel bearing device according to claim 2. 前記キャップの前記ドレーンの近傍に遮蔽板が接合され、この遮蔽板によって当該ドレーンの水抜き孔の開口部が覆われている請求項1乃至3いずれかに記載の車輪用軸受装置。   The wheel bearing device according to any one of claims 1 to 3, wherein a shielding plate is joined in the vicinity of the drain of the cap, and the opening of the drain hole of the drain is covered by the shielding plate. 前記キャップの円筒部の内径が前記嵌合部の内径よりも大径に形成されると共に、前記ドレーンが前記キャップの円筒部に径方向に突出して設けられている請求項1に記載の車輪用軸受装置。   2. The wheel for a vehicle according to claim 1, wherein an inner diameter of the cylindrical portion of the cap is formed larger than an inner diameter of the fitting portion, and the drain projects from the cylindrical portion of the cap in the radial direction. Bearing device. 前記キャップに貫通孔が穿設され、この貫通孔に前記ドレーンが別体として固定されている請求項1乃至5いずれかに記載の車輪用軸受装置。   The wheel bearing device according to any one of claims 1 to 5, wherein a through hole is formed in the cap, and the drain is fixed separately to the through hole. 前記ドレーンがL字状に形成され、前記キャップの貫通孔に嵌合される円環状の嵌合部と、この嵌合部から路面方向に垂下する排出部を備えている請求項6に記載の車輪用軸受装置。   The drain according to claim 6, wherein the drain is formed in an L shape, and includes an annular fitting portion that is fitted into the through hole of the cap, and a discharge portion that hangs down in the road surface direction from the fitting portion. Wheel bearing device. 前記ドレーンが、前記キャップの貫通孔に嵌合される円環状の嵌合部を備える金属製とされ、前記ドレーンの水抜き孔の開口部を拡径させて当該ドレーンが前記貫通孔に加締固定されている請求項6または7に記載の車輪用軸受装置。   The drain is made of metal having an annular fitting portion that fits into the through hole of the cap, and the drain is caulked to the through hole by increasing the diameter of the drain hole of the drain. The wheel bearing device according to claim 6 or 7, wherein the wheel bearing device is fixed. 前記ドレーンが円環状の金属製とされ、前記キャップの貫通孔の開口部に溶接により一体に接合されている請求項6または7に記載の車輪用軸受装置。   The wheel bearing device according to claim 6 or 7, wherein the drain is made of an annular metal, and is integrally joined to the opening of the through hole of the cap by welding. 前記ドレーンが合成樹脂製とされ、前記キャップの貫通孔にインサート成形により一体に接合されている請求項6に記載の車輪用軸受装置。   The wheel bearing device according to claim 6, wherein the drain is made of a synthetic resin, and is integrally joined to the through hole of the cap by insert molding. 前記内輪に、円周方向に特性を交互に、かつ等間隔に変化させたパルサリングが外嵌され、前記キャップに回転速度センサが装着されると共に、前記キャップの軸受内方側に内側キャップが配設され、この内側キャップが非磁性のオーステナイト系ステンレス鋼板から形成され、前記外方部材の端部内周に圧入される円筒状の嵌合部と、この嵌合部から径方向内方に延び、前記パルサリングに僅かな軸方向すきまを介して対峙する円板部を備え、この円板部に前記回転速度センサが衝合または近接され、前記内側キャップを介して前記パルサリングに対向配置されている請求項1に記載の車輪用軸受装置。   A pulsar ring whose characteristics are alternately changed at equal intervals in the circumferential direction is externally fitted to the inner ring, a rotational speed sensor is mounted on the cap, and an inner cap is disposed on the bearing inner side of the cap. The inner cap is formed of a nonmagnetic austenitic stainless steel plate, and is fitted into a cylindrical fitting portion that is press-fitted into the inner periphery of the end of the outer member, and extends radially inward from the fitting portion, A disk portion facing the pulsar ring via a slight axial clearance is provided, and the rotational speed sensor is abutted or brought close to the disk portion, and is disposed opposite to the pulsar ring via the inner cap. Item 2. A wheel bearing device according to Item 1.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02145666U (en) * 1989-05-12 1990-12-11
JP2009108876A (en) * 2007-10-26 2009-05-21 Ntn Corp Bearing device for wheel with rotational speed detection device
JP2013204652A (en) * 2012-03-28 2013-10-07 Ntn Corp Bearing device for wheel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02145666U (en) * 1989-05-12 1990-12-11
JP2009108876A (en) * 2007-10-26 2009-05-21 Ntn Corp Bearing device for wheel with rotational speed detection device
JP2013204652A (en) * 2012-03-28 2013-10-07 Ntn Corp Bearing device for wheel

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