JP5459355B2 - Rolling bearing device for wheels - Google Patents

Rolling bearing device for wheels Download PDF

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JP5459355B2
JP5459355B2 JP2012134390A JP2012134390A JP5459355B2 JP 5459355 B2 JP5459355 B2 JP 5459355B2 JP 2012134390 A JP2012134390 A JP 2012134390A JP 2012134390 A JP2012134390 A JP 2012134390A JP 5459355 B2 JP5459355 B2 JP 5459355B2
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outer ring
peripheral surface
rolling bearing
cylindrical
cover member
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JP2012167821A (en
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淑人 ▲高▼田
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JTEKT Corp
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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
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

Description

この発明は、車輪が取り付けられるハブホイールのハブ軸の外周に転がり軸受が組み付けられた車輪用転がり軸受装置に関する。   The present invention relates to a wheel rolling bearing device in which a rolling bearing is assembled to the outer periphery of a hub shaft of a hub wheel to which a wheel is attached.

従来、この種の車輪用転がり軸受装置においては、ハブホイールのハブ軸の外周に組み付けられた転がり軸受の内部を泥水や塵埃から保護するために、転がり軸受の外輪の一端側開口部に低炭素鋼板をプレス加工して形成した金属製のカバー部材が嵌込まれて塞がれたものが知られている。
また、カバー部材は、蓋部とこの蓋部の外周縁から軸方向に突出された筒部とを一体に有し、筒部の外径寸法は、外輪の一端側開口部の内径寸法よりも僅かに大きく設定されている。そして、外輪の一端側開口部にカバー部材がその筒部において嵌合（圧入）されて取り付けられるのが一般的であった。
また、車輪用転がり軸受装置において、転がり軸受の外輪の一端側開口部がカバー部材によって塞がれたものとしては、例えば、特許文献１に開示されている。
特開昭６３−１７６７６１号公報 Conventionally, in this type of wheel rolling bearing device, in order to protect the inside of the rolling bearing assembled on the outer periphery of the hub axle of the hub wheel from muddy water and dust, a low carbon is provided at one end side opening of the outer ring of the rolling bearing. 2. Description of the Related Art A metal cover member formed by pressing a steel plate is fitted and closed.
Further, the cover member integrally includes a lid portion and a cylindrical portion protruding in the axial direction from the outer peripheral edge of the lid portion, and the outer diameter dimension of the cylindrical portion is larger than the inner diameter dimension of the opening on the one end side of the outer ring. It is set slightly larger. In general, the cover member is fitted (press-fitted) into the opening on the one end side of the outer ring and attached.
Moreover, in the wheel rolling bearing device for wheels, for example, Patent Document 1 discloses that one end side opening of the outer ring of the rolling bearing is closed by a cover member.
JP 63-176761 A

ところで、金属製のカバー部材は、長期間泥水や融雪剤が付着したままの状態で使用されると発錆し、その発錆が甚だしい場合には、外輪の一端側開口部とカバー部材の筒部の外周面との嵌合部分に隙間が発生し、その隙間から泥水や塵埃等が浸入することが予見される。
このため、カバー部材の外表面を塗装したり、あるいは発錆しにくいステンレス鋼板製としている。しかしながら、塗装の場合、小石なとが当たって塗装が傷つくと、そこから錆が進行する恐れがあるので、塗膜の厚さを厚くする必要があり、塗装コストが増加してしまう。また、ステンレス鋼板は、所望の寸法精度を得るために、複数回に分けてプレス加工する必要があり、製造コストが高くなってしまう。 By the way, a metal cover member rusts when used in a state where muddy water or a snow melting agent is adhered for a long period of time, and when the rust is severe, one end side opening of the outer ring and the cylinder of the cover member It is foreseen that a gap will be generated in the fitting part with the outer peripheral surface of the part, and muddy water, dust, etc. will enter from the gap.
For this reason, the outer surface of the cover member is painted or made of a stainless steel plate that hardly rusts. However, in the case of coating, if the pebbles hit and the coating is damaged, there is a possibility that rust may progress from there, so that it is necessary to increase the thickness of the coating film, which increases the coating cost. Moreover, in order to obtain a desired dimensional accuracy, a stainless steel plate needs to be pressed in a plurality of times, resulting in an increase in manufacturing cost.

この発明の目的は、前記問題点に鑑み、外輪の一端側開口部の内周面とカバー部材の筒部との嵌合部分に対する隙間の発生を防止することができる車輪用転がり軸受装置を提供することである。   In view of the above problems, an object of the present invention is to provide a rolling bearing device for a wheel that can prevent generation of a gap with respect to a fitting portion between an inner peripheral surface of an opening on one end side of an outer ring and a cylindrical portion of a cover member. It is to be.

前記目的を達成するために、この発明の請求項１に係る車輪用転がり軸受装置は、車輪が取り付けられるハブホイールのハブ軸の外周に転がり軸受が組み付けられ、前記転がり軸受の外輪の一端側開口部にカバー部材が嵌込まれた車輪用転がり軸受装置であって、
前記カバー部材は、蓋部とこの蓋部の外周縁から軸方向に突出された筒部とを一体に有すると共に前記筒部の外周面に環状凹部が形成された金属製のカバー本体と、このカバー本体の筒部の外周面を覆う弾性体よりなる筒部弾性層とを備え、
前記筒部弾性層は、前記カバー部材の製作のバラツキを吸収するために、前記環状凹部内に充填保持された充填部分を厚肉の弾性変形部とし、
前記外輪の一端側開口部の内周面に前記カバー部材が嵌込まれた取付状態では、前記厚肉の弾性変形部を含む前記筒部弾性層が弾性圧縮されて前記外輪の一端側開口部の内周面に密接し、
しかも、前記外輪の一端側開口部の内周縁には面取り部が形成され、
前記厚肉の弾性変形部を含む前記筒部弾性層の一部が前記面取り部に弾性的に密接していることを特徴とする。 In order to achieve the above object, a rolling bearing device for a wheel according to claim 1 of the present invention has a rolling bearing assembled on the outer periphery of a hub shaft of a hub wheel to which a wheel is attached, and an opening on one end side of an outer ring of the rolling bearing. A rolling bearing device for a wheel in which a cover member is fitted in a part,
The cover member integrally includes a cover portion and a cylindrical portion protruding in the axial direction from the outer peripheral edge of the cover portion, and a metal cover main body having an annular recess formed on the outer peripheral surface of the cylindrical portion; A cylindrical elastic layer made of an elastic body covering the outer peripheral surface of the cylindrical portion of the cover body,
The cylindrical elastic layer in order to absorb variations of fabrication of the cover member, and the filling retained filled portion before Symbol annular recess with elastic deformation of the thick,
In the attached state in which the cover member is fitted to the inner peripheral surface of the one end side opening of the outer ring, the cylindrical elastic layer including the thick elastic deformation portion is elastically compressed and the one end opening of the outer ring is compressed. Close to the inner peripheral surface of
Moreover, a chamfered portion is formed on the inner peripheral edge of the opening on the one end side of the outer ring,
A part of the cylindrical elastic layer including the thick elastic deformation portion is elastically in close contact with the chamfered portion.

前記構成によると、外輪の一端側開口部の内周面にカバー部材を取り付ける場合、カバー部材が筒部において嵌込まれることで取り付けられる。
この取付状態において、筒部弾性層が弾性圧縮し、外輪の一端側開口部の内周面に密接する。これによって、外輪の一端側開口部の内周面とカバー部材の筒部との嵌合部分に対する隙間の発生を良好に防止することができ、防水性（シール性）に優れる。
また、筒部弾性層は、カバー本体の筒部の外周面の環状凹部の充填部分を厚肉の弾性変形部としているため、厚肉の弾性変形部において、弾性圧縮量を大きくすることができる。そして、弾性変形部の弾性圧縮によって、カバー部材の製作のバラツキを吸収することができると共に、外輪の一端側開口部の内周面に対しより一層確実に密接することができ、防水性の向上を図ることができる。
また、厚肉の弾性変形部を含む筒部弾性層の一部が外輪の開口部内周縁の面取り部に弾性的に密接することで、防水性をより一層高めることができる。 If by the structure, when attaching the cover member to the inner peripheral surface of one side opening of the outer wheel is mounted by the cover member is written fitted in the cylindrical portion.
The attached state odor Te, cylindrical elastic layer is elastically compressed, in close contact with the inner peripheral surface of one side opening of the outer ring. Thus, it is possible to satisfactorily prevent the occurrence of a gap with respect to the fitting portion between the cylindrical portion of the inner peripheral surface and the cover member opening at one end of the outer ring, Ru excellent waterproof (sealable).
Moreover, since the cylinder part elastic layer uses the filling part of the annular recessed part of the outer peripheral surface of the cylinder part of a cover main body as a thick elastic deformation part, an elastic compression amount can be enlarged in a thick elastic deformation part. . And the elastic compression of the elastic deformation part can absorb the variation in the production of the cover member, and can be more reliably brought into close contact with the inner peripheral surface of the one end side opening of the outer ring, thereby improving the waterproofness. Can be achieved.
Moreover, waterproofness can be further improved because a part of cylinder part elastic layer containing a thick elastic deformation part closely_contact | adheres to the chamfering part of the opening inner peripheral edge of an outer ring | wheel.

この発明の実施例１に係る車輪用転がり軸受装置を示す断面図である。It is sectional drawing which shows the rolling bearing device for wheels which concerns on Example 1 of this invention. 同じく外輪の一端側開口部の内周面にカバー部材の筒部が嵌込まれて取り付けられた状態を拡大して示す断面図である。It is sectional drawing which expands and shows the state where the cylinder part of the cover member was similarly inserted and attached to the internal peripheral surface of the one end side opening part of an outer ring | wheel. 同じく外輪の一端側開口部の内周面と取付前のカバー部材の弾性被覆体の筒部弾性層との関係を示す説明図である。It is explanatory drawing which similarly shows the relationship between the internal peripheral surface of the one end side opening part of an outer ring | wheel, and the cylinder part elastic layer of the elastic coating body of the cover member before attachment.

次に、この発明を実施するための形態について実施例にしたがって説明する。   Next, modes for carrying out the present invention will be described in accordance with embodiments.

この発明の実施例１を図面にしたがって説明する。
図１はこの発明の実施例１に係る車輪用転がり軸受装置を示す断面図である。図２は外輪の一端側開口部の内周面にカバー部材の筒部が嵌込まれて取り付けられた状態を拡大して示す断面図である。図３は外輪の一端側開口部の内周面と取付前のカバー部材の弾性被覆体の筒部弾性層との関係を示す説明図である。
図１に示すように、車輪用転がり軸受装置（車輪用ハブユニット）１０は、ハブホイール１１と、転がり軸受としての複列のアンギュラ玉軸受２１とを一体状に有してユニット化されている。 A first embodiment of the present invention will be described with reference to the drawings.
1 is a cross-sectional view showing a wheel rolling bearing device according to Embodiment 1 of the present invention. FIG. 2 is an enlarged cross-sectional view showing a state in which the cylindrical portion of the cover member is fitted and attached to the inner peripheral surface of the opening on the one end side of the outer ring. FIG. 3 is an explanatory view showing the relationship between the inner peripheral surface of the opening on the one end side of the outer ring and the cylindrical elastic layer of the elastic covering of the cover member before attachment.
As shown in FIG. 1, a wheel rolling bearing device (wheel hub unit) 10 has a hub wheel 11 and a double row angular ball bearing 21 as a rolling bearing which are integrated into a unit. .

図１に示すように、ハブホイール１１は、ハブ軸１４と、ハブ軸１４の一端部寄り外周面に形成されたフランジ１２とを一体に有し、フランジ１２には、複数本のボルトによってブレーキロータを間に挟んで車輪（従動輪）が取り付けられるようになっている。
ハブ軸１４の外周には、外輪２２、内輪３０、転動体としての複数の玉３５、３６及び保持器３７、３８を備えた複列のアンギュラ玉軸受２１が組み付けられている。 As shown in FIG. 1, the hub wheel 11 integrally includes a hub shaft 14 and a flange 12 formed on an outer peripheral surface near one end of the hub shaft 14. The flange 12 is braked by a plurality of bolts. Wheels (driven wheels) can be attached with the rotor in between.
A double row angular ball bearing 21 including an outer ring 22, an inner ring 30, a plurality of balls 35, 36 as rolling elements and cages 37, 38 is assembled on the outer periphery of the hub shaft 14.

この実施例１において、ハブ軸１４はフランジ１２側に形成された大径軸部１５と、大径軸部１５よりも適宜に小径でかつ大径軸部１５と段差面をもって連続して形成された小径軸部１７とを一体に有している。そして、大径軸部１５の外周面に、外輪２２の第１の外輪側軌道面２３に対応する第１の内輪側軌道面３１が形成されている。
さらに、外輪２２の第２の外輪側軌道面２４に対応する第２の内輪側軌道面３２が外周面に形成された内輪３０がハブ軸１４の小径軸部１７の外周面に嵌込まれた後、小径軸部１７の先端部がかしめられてかしめ部１８が形成されることによって、内輪３０が段差面とかしめ部１８との間に固定されている。 In the first embodiment, the hub shaft 14 is continuously formed with a large-diameter shaft portion 15 formed on the flange 12 side and a diameter that is appropriately smaller than the large-diameter shaft portion 15 and a step surface with the large-diameter shaft portion 15. The small-diameter shaft portion 17 is integrally provided. A first inner ring side raceway surface 31 corresponding to the first outer ring side raceway surface 23 of the outer ring 22 is formed on the outer peripheral surface of the large diameter shaft portion 15.
Further, the inner ring 30 in which the second inner ring side raceway surface 32 corresponding to the second outer ring side raceway surface 24 of the outer ring 22 is formed on the outer circumference surface is fitted into the outer circumference surface of the small diameter shaft portion 17 of the hub shaft 14. Thereafter, the inner ring 30 is fixed between the stepped surface and the caulking portion 18 by caulking the tip end portion of the small diameter shaft portion 17 to form the caulking portion 18.

また、外輪２２の第１、第２の両軌道面２３、２４と、ハブ軸１４側の第１、第２の両軌道面３１、３２との間には各複数個の玉３５、３６と、これら各複数個の玉３５、３６をそれぞれ保持する保持器３７、３８が組み付けられる。
また、外輪２２の外周面には、車両の懸架装置（図示しない）に支持された車体側部材（ナックル、又はキャリア）にボルトによって取り付けるための取付フランジ２５が一体に形成されている。 A plurality of balls 35, 36 are provided between the first and second raceway surfaces 23, 24 of the outer ring 22 and the first and second raceway surfaces 31, 32 on the hub shaft 14 side. The holders 37 and 38 for holding the balls 35 and 36 are assembled.
A mounting flange 25 is integrally formed on the outer peripheral surface of the outer ring 22 to be attached to a vehicle body side member (knuckle or carrier) supported by a vehicle suspension device (not shown) with a bolt.

前記したハブホイール１１のハブ軸１４の外周に組み付けられた転がり軸受としてのアンギュラ玉軸受２１の内部を泥水や塵埃から保護するために、図１と図２に示すように、外輪２２の一端側開口部にはカバー部材４０が嵌込まれて塞がれている。
カバー部材４０は、金属製のカバー本体４１と、弾性被覆体４５とを備えて有蓋筒状に形成されている。
図２と図３に示すように、カバー本体４１は、低炭素鋼板等の金属板のプレス加工によって形成され、蓋部４２とこの蓋部４２の外周縁から軸方向に突出された筒部４３とを一体に備えている。
弾性被覆体４５は、軟質樹脂（熱可塑性エラストマ）、ゴム等の弾性体よりなり、カバー本体４１の蓋部４２及び筒部４３の外表面全面を覆う蓋部弾性層４６及び筒部弾性層４７を一体連続状に有している。 In order to protect the inside of the angular ball bearing 21 as a rolling bearing assembled on the outer periphery of the hub shaft 14 of the hub wheel 11 from muddy water and dust, as shown in FIGS. 1 and 2, one end side of the outer ring 22 is provided. A cover member 40 is fitted and closed in the opening.
The cover member 40 includes a metal cover body 41 and an elastic cover 45 and is formed in a covered cylinder shape.
As shown in FIGS. 2 and 3, the cover body 41 is formed by pressing a metal plate such as a low-carbon steel plate, and has a lid portion 42 and a cylindrical portion 43 that protrudes in the axial direction from the outer peripheral edge of the lid portion 42. And integrated.
The elastic covering body 45 is made of an elastic body such as a soft resin (thermoplastic elastomer) or rubber, and covers the cover portion 41 of the cover body 41 and the entire outer surface of the tube portion 43. Are integrally formed.

図３に示すように、外輪２２の一端側開口部の内周面２６にカバー部材４０が嵌込まれる前の状態において、弾性被覆体４５の筒部弾性層４７の外径寸法（最大外径寸法）Ａは、外輪２２の内周面２６の内径寸法Ｂよりも大きく設定されている。
そして、図１と図２に示すように、外輪２２の一端側開口部の内周面２６にカバー部材４０が嵌込まれた取付状態では、筒部弾性層４７が弾性圧縮されて外輪２２の一端側開口部の内周面２６に密接するようになっている。 As shown in FIG. 3, the outer diameter dimension (maximum outer diameter) of the cylindrical elastic layer 47 of the elastic covering body 45 in a state before the cover member 40 is fitted into the inner peripheral surface 26 of the opening on the one end side of the outer ring 22. The dimension (A) is set larger than the inner diameter dimension B of the inner peripheral surface 26 of the outer ring 22.
As shown in FIGS. 1 and 2, in the attached state in which the cover member 40 is fitted into the inner peripheral surface 26 of the one end side opening of the outer ring 22, the cylindrical elastic layer 47 is elastically compressed and the outer ring 22 It comes in close contact with the inner peripheral surface 26 of the one end side opening.

また、この実施例１において、図２と図３に示すように、カバー本体４１の筒部４３の外周面には環状凹部４４が形成され、筒部弾性層４７は、環状凹部４４内に充填保持されると共に、環状凹部４４の充填部分を厚肉の弾性変形部４８としている。
すなわち、この実施例１においては、筒部弾性層４７の弾性変形部４８の外周面が最大外径寸法をなす外径寸法Ａに設定されている。 Further, in the first embodiment, as shown in FIGS. 2 and 3, an annular recess 44 is formed on the outer peripheral surface of the cylinder portion 43 of the cover body 41, and the cylinder elastic layer 47 is filled in the annular recess 44. While being held, the filling portion of the annular recess 44 is a thick elastic deformation portion 48.
That is, in the first embodiment, the outer peripheral surface of the elastic deformation portion 48 of the cylindrical elastic layer 47 is set to the outer diameter dimension A that forms the maximum outer diameter dimension.

また、図３に示すように、筒部弾性層４７の先端部分４９は肉厚寸法ｔをもって薄肉状をなすと共に、カバー本体４１の筒部４３の先端側外周面に一体状に接合されている。そして、カバー本体４１の筒部４３の外径寸法Ｄに筒部弾性層４７の先端部分４９の肉厚寸法ｔを加えた先端部分４９の外径寸法Ｃは、弾性変形部４８の外径寸法Ａよりも小さく、外輪２２の内周面２６の内径寸法Ｂと略同じ大きさに設定されている。   As shown in FIG. 3, the distal end portion 49 of the cylindrical elastic layer 47 has a thin wall thickness t and is integrally joined to the outer peripheral surface on the distal end side of the cylindrical portion 43 of the cover body 41. . The outer diameter C of the distal end portion 49 obtained by adding the thickness t of the distal end portion 49 of the cylindrical elastic layer 47 to the outer diameter D of the cylindrical portion 43 of the cover main body 41 is the outer diameter dimension of the elastic deformation portion 48. It is smaller than A and set to approximately the same size as the inner diameter dimension B of the inner peripheral surface 26 of the outer ring 22.

また、この実施例１において、図２と図３に示すように、外輪２２の一端側開口部の内周縁には所定の面取り角度をもって面取り部２７が形成され、図２に示す取付状態では、筒部弾性層４７の弾性変形部４８の一部４８ａが面取り部２７に弾性的に密接するようになっている。   Further, in the first embodiment, as shown in FIGS. 2 and 3, a chamfered portion 27 is formed with a predetermined chamfering angle on the inner peripheral edge of the opening on the one end side of the outer ring 22, and in the attached state shown in FIG. A part 48 a of the elastically deforming portion 48 of the cylindrical elastic layer 47 is elastically in close contact with the chamfered portion 27.

この実施例１に係る車輪用転がり軸受装置は上述したように構成される。
したがって、図１に示すように、金属製のカバー本体４１の蓋部４２及び筒部４３の外表面が弾性被覆体４５によって覆われることで、カバー本体４１の発錆が防止される。
また、外輪２２の一端側開口部の内周面２６にカバー部材４０を取り付ける場合、カバー部材４０が筒部４３において嵌込まれることで取り付けられる。
この取付状態において、弾性被覆体４５の筒部弾性層４７の外径寸法Ａが外輪２２の一端側開口部の内周面２６の内径寸法Ｂよりも大きく設定された分だけ筒部弾性層４７が弾性圧縮し、外輪２２の一端側開口部の内周面２６に密接する。これによって、外輪２２の一端側開口部の内周面２６とカバー部材４０の筒部４３との嵌合部分に対する隙間の発生を良好に防止することができ、防水性に優れる。 The wheel rolling bearing device according to the first embodiment is configured as described above.
Therefore, as shown in FIG. 1, the outer surface of the lid portion 42 and the cylindrical portion 43 of the metal cover main body 41 is covered with the elastic covering body 45, thereby preventing rusting of the cover main body 41.
Further, when the cover member 40 is attached to the inner peripheral surface 26 of the opening on the one end side of the outer ring 22, the cover member 40 is attached by being fitted in the cylindrical portion 43.
In this attached state, the cylindrical elastic layer 47 is set by an amount that the outer diameter A of the cylindrical elastic layer 47 of the elastic covering 45 is set larger than the inner diameter B of the inner peripheral surface 26 of the opening on the one end side of the outer ring 22. Is elastically compressed and comes into close contact with the inner peripheral surface 26 of the opening on the one end side of the outer ring 22. As a result, it is possible to satisfactorily prevent the occurrence of a gap with respect to the fitting portion between the inner peripheral surface 26 of the opening on the one end side of the outer ring 22 and the cylindrical portion 43 of the cover member 40, and the waterproof property is excellent.

また、この実施例１において、筒部弾性層４７は、カバー本体４１の筒部４３の外周面の環状凹部４４の充填部分を厚肉の弾性変形部４８としている。このため、厚肉の弾性変形部４８において、弾性圧縮量を大きくすることができる。そして、弾性変形部４８の弾性圧縮によって、カバー部材４０の製作のバラツキを吸収することができると共に、外輪２２の一端側開口部の内周面２６に対しより一層確実に密接することができ、防水性の向上を図ることができる。
また、この実施例１において、図２に示すように、筒部弾性層４７の弾性変形部４８の一部４８が外輪２２の開口部内周縁の面取り部２７に弾性的に密接することで、防水性をより一層高めることができる。 In the first embodiment, the cylindrical elastic layer 47 has a thick elastic deformation portion 48 in the filling portion of the annular recess 44 on the outer peripheral surface of the cylindrical portion 43 of the cover body 41. For this reason, in the thick elastic deformation part 48, the amount of elastic compression can be enlarged. And, by elastic compression of the elastic deformation portion 48, it is possible to absorb variations in the production of the cover member 40, and more reliably contact with the inner peripheral surface 26 of the one end side opening of the outer ring 22, The waterproof property can be improved.
Further, in the first embodiment, as shown in FIG. 2, a part 48 of the elastic deformation portion 48 of the cylindrical elastic layer 47 is elastically in close contact with the chamfered portion 27 at the inner peripheral edge of the opening of the outer ring 22. The sex can be further enhanced.

なお、この発明は前記実施例１に限定するものではない。
例えば、前記実施例１においては、車輪用転がり軸受装置（車輪用ハブユニット）１０が従動輪に対応する場合を例示したが、ハブホイールのハブ軸が筒軸状に形成され、そのハブ軸の内孔に車軸（駆動軸）がトルク伝達可能に嵌合される駆動輪用の車輪用転がり軸受装置（車輪用ハブユニット）においてもこの発明を実施することができる。
また、前記実施例１においては、転がり軸受として、複列のアンギュラ玉軸受２１が採用された場合を例示したが、複列の円すいころ軸受を用いてもこの発明を実施可能である。 The present invention is not limited to the first embodiment.
For example, in the first embodiment, the case where the wheel rolling bearing device (wheel hub unit) 10 corresponds to the driven wheel is illustrated, but the hub shaft of the hub wheel is formed in a cylindrical shaft shape. The present invention can also be implemented in a wheel rolling bearing device (wheel hub unit) for a drive wheel in which an axle (drive shaft) is fitted in the inner hole so that torque can be transmitted.
Moreover, in the said Example 1, although the case where the double row angular ball bearing 21 was employ | adopted as a rolling bearing was illustrated, this invention can be implemented even if it uses a double row tapered roller bearing.

１０ 車輪用転がり軸受装置（車輪用ハブユニット）
１１ ハブホイール
１２ フランジ
１４ ハブ軸
２１ アンギュラ玉軸受（転がり軸受）
２２ 外輪
２６ 内周面
４０ カバー部材
４１ カバー本体
４２ 蓋部
４３ 筒部
４５ 弾性被覆体
４６ 蓋部弾性層
４７ 筒部弾性層
４８ 弾性変形部 10 Rolling bearing device for wheels (hub unit for wheels)
11 Hub Wheel 12 Flange 14 Hub Shaft 21 Angular Contact Ball Bearing (Rolling Bearing)
22 outer ring 26 inner peripheral surface 40 cover member 41 cover main body 42 lid part 43 cylinder part 45 elastic cover 46 lid part elastic layer 47 cylinder part elastic layer 48 elastic deformation part

Claims (1)

車輪が取り付けられるハブホイールのハブ軸の外周に転がり軸受が組み付けられ、前記転がり軸受の外輪の一端側開口部にカバー部材が嵌込まれた車輪用転がり軸受装置であって、
前記カバー部材は、蓋部とこの蓋部の外周縁から軸方向に突出された筒部とを一体に有すると共に前記筒部の外周面に環状凹部が形成された金属製のカバー本体と、このカバー本体の筒部の外周面を覆う弾性体よりなる筒部弾性層とを備え、
前記筒部弾性層は、前記カバー部材の製作のバラツキを吸収するために、前記環状凹部内に充填保持された充填部分を厚肉の弾性変形部とし、
前記外輪の一端側開口部の内周面に前記カバー部材が嵌込まれた取付状態では、前記厚肉の弾性変形部を含む前記筒部弾性層が弾性圧縮されて前記外輪の一端側開口部の内周面に密接し、
しかも、前記外輪の一端側開口部の内周縁には面取り部が形成され、
前記厚肉の弾性変形部を含む前記筒部弾性層の一部が前記面取り部に弾性的に密接していることを特徴とする車輪用転がり軸受装置。 A rolling bearing device for a wheel in which a rolling bearing is assembled on the outer periphery of a hub shaft of a hub wheel to which a wheel is attached, and a cover member is fitted into one end side opening of the outer ring of the rolling bearing,
The cover member integrally includes a cover portion and a cylindrical portion protruding in the axial direction from the outer peripheral edge of the cover portion, and a metal cover main body having an annular recess formed on the outer peripheral surface of the cylindrical portion; A cylindrical elastic layer made of an elastic body covering the outer peripheral surface of the cylindrical portion of the cover body,
The cylindrical elastic layer in order to absorb variations of fabrication of the cover member, and the filling retained filled portion before Symbol annular recess with elastic deformation of the thick,
In the attached state in which the cover member is fitted to the inner peripheral surface of the one end side opening of the outer ring, the cylindrical elastic layer including the thick elastic deformation portion is elastically compressed and the one end opening of the outer ring is compressed. Close to the inner peripheral surface of
Moreover, a chamfered portion is formed on the inner peripheral edge of the opening on the one end side of the outer ring,
A rolling bearing device for a wheel according to claim 1, wherein a part of the cylindrical elastic layer including the thick elastic deformation portion is elastically in close contact with the chamfered portion.
JP2012134390A 2012-06-14 2012-06-14 Rolling bearing device for wheels Expired - Fee Related JP5459355B2 (en)

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