JP2011069419A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for wheels with improved sealability of a seal. <P>SOLUTION: The seal 8 is composed of: a core metal 12 comprising a fitting part 12a fitted inside an end of an outer member 5, an inner diameter part 12b extending radially inward from the fitting part, and a flange part 12c extending radially outward from the fitting part 12a; and a seal member 13 joined to the core metal 12 and integrally having a side lip 13a inclined and extended outward in the radial direction, a dust lip 13b inclined and extended outward in the radial direction on the inner diameter side, and a grease lip 13c inclined and extended to the inner side of a bearing. A base 6b of a wheel-mounting flange 6 is formed on a curved surface having a circular cross section, and the side lip 13a, the dust lip 13b, and the grease lip 13c are in slide-contact thereto. The flange part 12c faces a side surface 6c of the wheel mounting flange 6 and an end surface 5c of the outer member 5 via a predetermined axial gap to respectively compose a labyrinth seal 14 and a circular drain ditch 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like with respect to a suspension device, and more particularly to a wheel bearing device that improves the sealing performance of a seal.

  2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like supports a hub wheel for mounting a wheel rotatably via a double row rolling bearing, and includes a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and an inner ring rotation method and an outer ring rotation method are generally used for driven wheels. Further, the wheel bearing device has a structure called a first generation in which a wheel bearing composed of a double row angular ball bearing or the like is fitted between a knuckle and a hub wheel constituting a suspension device. Second generation structure in which body mounting flange or wheel mounting flange is formed directly on the outer periphery of the member, third generation structure in which one inner rolling surface is directly formed on the outer periphery of the hub wheel, or hub wheel, etc. It is roughly classified into a fourth generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the speed universal joint.

  Since these wheel bearing devices are disposed at sites where muddy water or the like is easily applied, a sealing device is attached so as to seal between the outer member and the inner member. Here, when the bearing damage situation of the market-recovered product is verified, the damage due to the malfunction of the sealing device occupies more than the original bearing life resulting from peeling or the like. Therefore, it is possible to reliably improve the bearing life by increasing the sealing performance and durability of the sealing device. Generally, in a sealing device, a seal member having a seal lip is attached to an outer member serving as a stationary member, and the seal lip is slidably contacted with an outer peripheral surface of the inner member.

  Conventionally, various seal structures with improved sealing performance have been proposed. An example of a wheel bearing device having such a seal structure is shown in FIG. This wheel bearing device has an outer member 100 that is non-rotatably attached to the vehicle body side via a knuckle and has outer rows 100a and 100a formed in double rows on the inner periphery. A hub wheel 103 and an outer joint member of a constant velocity universal joint (not shown) which are integrally attached to the hub wheel 103 through double rows of balls 102 and 102 held at circumferentially equidistant positions on the cage 101. It is supported so as to be rotatable around its axis.

  An inner rolling surface 103a opposite to the double row outer rolling surfaces 100a, 100a of the outer member 100 is formed on the outer periphery of the hub wheel 103, and a wheel mounting flange for mounting a brake disk and a wheel (not shown) at one end. 104 protrudes radially outward.

  The seal structure 105 includes a side surface 104 a on the outer member 100 side of the wheel mounting flange 104, a core metal 106 fitted to the inner peripheral surface of the outer member 100, and an elastic seal body 107 fixed to the core metal 106. It consists of and. The elastic seal body 107 has two axial lip portions 108 that are in axial contact with the side surface 104 a of the wheel mounting flange 104, and a radial lip portion 109 that is in radial contact with the outer peripheral surface of the hub wheel 103. Yes.

  Further, the cored bar 106 has a circular arc shape (a crescent shape) that is partially extended along the side surface 104 a of the wheel mounting flange 104 so as to protrude radially outward from the outer peripheral surface 100 b of the outer member 100. A dam member 106 a is formed, and the dam member 106 a is in close contact with the end surface of the outer member 100 on the side surface 104 a side. Further, the weir member 106a is formed only above the axis.

  For example, when muddy water is applied to the outer member 100 during traveling of the vehicle, such a seal structure 105 is formed so that a part of the cored bar 106 has a radially outward direction upward from the outer peripheral surface 100b of the outer member 100. Since the dam member 106a extended so as to protrude is formed, the muddy water is prevented from flowing to the outer member 100 and the side surface 104a of the wheel mounting flange 104 by the dam member 106a. Therefore, the muddy water of the outer member 100 does not flow and collect in the axial lip portion 108, and the sealing performance can be maintained (see, for example, Patent Document 1).

JP 2003-49852 A

  However, in such a conventional seal structure 105, since the weir member 106a extended so as to protrude radially outward is formed on a part of the core metal 106, the core metal 106 is in a state in which the phases are matched at the time of assembly. There is a problem in that it has to be fitted to the outer member 100 and the number of assembly steps increases. Further, since the weir member 106 a is formed on the cored bar 106, muddy water is prevented from flowing to the outer member 100 and the side surface 104 a of the wheel mounting flange 104, but the elastic seal body 107 is disposed on the side surface of the wheel mounting flange 104. Due to the structure contacting the shaft 104a in the axial direction, the clearance between the metal core 106 and the side surface 104a of the wheel mounting flange 104 inevitably increases, and muddy water flows and accumulates in the axial lip portion 108 from this clearance, and the sealing performance decreases. There was a fear.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a wheel bearing device that improves the sealing performance of a seal.

  In order to achieve such an object, the invention described in claim 1 of the present invention has a vehicle body mounting flange for being attached to a knuckle on the outer periphery, and a double row outer rolling surface on the inner periphery. A hub wheel integrally formed with a formed outer member and 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 a small-diameter step portion of the hub ring An inner member formed of an outer joint member of an inner ring or a constant velocity universal joint that is fitted and formed with an inner rolling surface facing the outer rolling surface of the double row, and the inner member and the outer member. A wheel comprising a double row rolling element housed between both rolling surfaces so as to be freely rollable, and a seal attached to an opening of an annular space formed between the outer member and the inner member. In the bearing device for a vehicle, an outer side seal of the seals A cylindrical fitting part press-fitted into the inner periphery of the part, a cored bar having an inner diameter part extending radially inward from the fitting part, and a single piece joined to the cored bar and inclined radially outward The flange portion is formed of a seal member having a side lip that extends and extends radially outward from the fitting portion of the metal core, and the flange portion has a slight axial clearance on the inner side surface of the wheel mounting flange. The labyrinth seal is configured, and the flange portion is opposed to the outer end surface of the outer member through a predetermined axial clearance to form an annular drain groove.

  Thus, in the wheel bearing device including the seal mounted in the opening of the annular space formed between the outer member and the inner member, the outer seal of the seals is the outer member. A cylindrical fitting portion that is press-fitted into the inner periphery of the end portion, a metal core having an inner diameter portion that extends radially inward from the fitting portion, and is integrally bonded to the metal core and inclined radially outward And a flange portion extending radially outward from the fitting portion of the metal core, and this flange portion has a slight axial clearance on the inner side surface of the wheel mounting flange. Since the labyrinth seal is configured and the flange portion is opposed to the outer end surface of the outer member through a predetermined axial clearance, and the annular drainage groove is configured, the direct seal On the side lip Since it is possible to prevent water from splashing, and even if muddy water gets on the outer member and travels around the outer peripheral surface while the vehicle is running, the drainage groove functions as a trap and the muddy water flows downward and is discharged. Further, it is possible to prevent the fluid from flowing between the side surface of the wheel mounting flange and to improve the durability and sealing performance of the seal over a long period of time.

  Moreover, like the invention of Claim 2, the said flange part may be integrally formed with the said metal core by press work from the steel plate.

  Further, as in the third aspect of the invention, if the flange portion is formed to have a larger diameter than the outer periphery of the outer side end portion of the outer member, the flange portion serves as a weir, and the vehicle It is possible to prevent muddy water from being applied to the outer member during the travel of the vehicle and flowing between the outer peripheral surface and the flange portion and the side surface of the wheel mounting flange.

  Further, as in the invention according to claim 4, if the flange portion extends while being inclined toward the wheel mounting flange, the flange portion serves as a weir, and the outer member is moved while the vehicle is running. It is possible to prevent muddy water from flowing through the outer peripheral surface and flow between the flange portion and the side surface of the wheel mounting flange, and the drainage groove has a substantially triangular cross section. The muddy water that has been transmitted through the surface can effectively flow downward.

  Further, as in the invention described in claim 5, as long as a flange portion is provided between the fitting portion and the flange portion so as to extend outward in the radial direction and be in close contact with the outer end surface of the outer member. In addition, the cored bar has a stepped shape, the strength and rigidity of the cored bar itself is increased, and it can be prevented from being deformed or damaged due to the collision of scattered objects, etc. Accuracy can be improved.

  Further, as in the sixth aspect of the present invention, if the seal member wraps around and is fixed to a part of the fitting portion of the cored bar, the airtightness of the fitting portion with the outer member is improved. And it can prevent that muddy water etc. penetrate | invade from this fitting part from the outside.

  Moreover, if the said sealing member is continuously covered over the flange part from the fitting part of the said metal core like invention of Claim 7, fitting of a metal core and an outer member will be carried out. In addition to improving the airtightness of the parts, there is no risk of rusting even if inexpensive cold-rolled steel plates are used, even if the cored bar is not formed of an expensive steel plate such as stainless steel with anti-corrosive ability. Cost reduction can be achieved.

  Further, as in the invention according to claim 8, if the seal member is covered over the inner surface of the fitting portion and the flange portion is formed integrally with the seal member, the flange portion Can be prevented from being deformed or damaged due to collision of flying objects.

  Further, as in the invention according to claim 9, the base portion on the inner side of the wheel mounting flange is formed in a curved surface having a circular arc cross section, and the seal member is radially outward on the inner diameter side of the side lip. A dust lip extending in a slanted manner and a grease lip extending in a slanting direction toward the inner side of the bearing, the side lip and the dust lip are slidably contacted with the base portion in a predetermined axial direction, and the grease lip is predetermined. It may be slidably contacted via a radial squeeze.

  Further, as in the invention described in claim 10, the base portion on the inner side of the wheel mounting flange is formed in a curved surface having an arcuate cross section, and a metal ring is fitted to the base portion, and the seal member includes A dust lip that extends obliquely outward in the radial direction on the inner diameter side of the side lip and a grease lip that extends inclined toward the inner side of the bearing are integrally provided, and the side lip and dust lip are in a predetermined axial direction on the metal ring. The grease lip may be slidably contacted with a squeeze, and the grease lip may be slidably contacted via a predetermined radial squeeze.

  Further, as in the invention according to claim 11, the metal ring includes a curved portion formed in an arc shape corresponding to the curved surface of the base portion, and extends radially outward from the curved portion, and the wheel mounting flange A disc portion that is in close contact with the side surface of the inner side, and an umbrella portion that extends away from the outer diameter portion of the disc portion in the axial direction with respect to the wheel mounting flange. If a labyrinth seal is configured along the outer circumference of the outer end of the side member and a labyrinth seal is configured, it is possible to prevent muddy water or the like from directly entering the sliding contact portion between the seal and the metal ring. In addition to being able to prevent, even if muddy water is applied to the outer member during traveling of the vehicle and travels along its outer peripheral surface, it flows downward through the drainage groove and is discharged. The durability and sealing performance can be improved.

  Preferably, as in the twelfth aspect of the present invention, if the metal ring integrally has a bent portion that protrudes radially outward from the umbrella portion, the rigidity of the metal ring is increased. It is possible to improve and prevent deformation or damage due to collision of scattered objects.

  Further, as in the invention described in claim 13, the base portion is formed with a predetermined curvature radius r, and the curved portion of the metal ring is formed with a predetermined curvature radius R, and the respective curvature radii R, r Is set so that R ≧ r, it is possible to prevent the curved portion of the metal ring from interfering with the arcuate surface of the base when the metal ring is fitted to the base, and to lift the wheel mounting flange. It is possible to prevent a gap from being generated between the side surface and the disk portion of the metal ring. As a result, they can be brought into close contact with each other to suppress the unevenness of each lip and ensure a stable sealing performance.

  Moreover, if the said metal ring is formed with the steel plate which has corrosion resistance like invention of Claim 14, and the surface roughness of the steel plate used as the raw material is set to the range of Ra0.2-0.6. Can prevent rusting over a long period of time, maintain sealing performance, obtain a good seal sliding contact surface, suppress lip wear, and seal even if used in a poor environment The sealing performance can be maintained.

  In addition, as in the invention described in claim 15, the seals are arranged so as to face each other and are fitted into the end of the outer member, and the seal member joined integrally to the core A cylindrical fitting in which the slinger is formed by a pack seal comprising an annular seal plate and a slinger fitted to the inner member, and the slinger is press-fitted to the inner member via a predetermined shimiro. And a side lip and a bearing inner side extending from the fitting portion and a standing plate portion extending radially outward from the fitting portion, and the seal member extending further inwardly in the radial direction toward the inner diameter side of the side lip. A grease lip that extends in a slanted manner, and the side lip is slidably contacted with the slinger standing plate portion with a predetermined axial squeeze, and the grease lip is slid into a predetermined radial direction with the fitting portion of the slinger. The It may be sliding contact with.

  The wheel bearing device according to the present invention has an outer member integrally formed with a vehicle body mounting flange to be attached to a knuckle on the outer periphery, and an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and one end portion And a hub wheel having a wheel mounting flange for mounting the wheel integrally on the outer periphery, and a small-diameter step portion extending in the axial direction on the outer periphery, and a small-diameter step portion of the hub wheel, An inner member formed of an inner ring or an outer joint member of a constant velocity universal joint formed with an inner rolling surface facing the running surface, and freely rollable between both rolling surfaces of the inner member and the outer member. A wheel bearing device comprising: a double row of rolling elements accommodated; and a seal attached to an opening of an annular space formed between the outer member and the inner member. A cylindrical seal that is press-fitted into the inner periphery of the end of the outer member. And a seal member having a cored bar having an inner diameter part extending radially inward from the fitting part and a side lip integrally joined to the cored bar and extending obliquely outward in the radial direction. A flange portion extending radially outward from the fitting portion of the cored bar is formed, and this flange portion faces a side surface on the inner side of the wheel mounting flange via a slight axial clearance to form a labyrinth seal In addition, since the flange portion faces the outer end surface of the outer member through a predetermined axial clearance and an annular drainage groove is formed, muddy water is directly applied to the side lip of the seal. In addition to preventing the muddy water on the outer member during traveling of the vehicle and traveling along its outer peripheral surface, the drainage groove functions as a trap and the muddy water flows downward and is discharged. Can be prevented from flowing between the side surface, it is possible to improve the durability and sealing performance of the seal over a long period of time.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. (A) is the principal part enlarged view which shows the seal | sticker part of FIG. 1, (b) is the principal part enlarged view which shows the modification of (a), (c) shows the other modification of (a). It is a principal part enlarged view. (A)-(c) is a principal part enlarged view which shows the other modification of Fig.2 (a). (A)-(d) is the principal part enlarged view which shows another modification as same as the above. It is a principal part enlarged view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows the conventional seal structure.

  A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount 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 made of an inner ring that is press-fitted into a small-diameter step portion of the inner diameter through a predetermined squeeze and has an inner rolling surface that faces the other of the outer rolling surfaces of the double row on the outer periphery, and the inner member A double-row rolling element accommodated between both rolling surfaces of the outer member so as to roll freely, and a seal attached to an opening of an annular space formed between the outer member and the inner member In the wheel bearing device comprising: A cylindrical fitting portion formed by press working from a steel plate having a function and press-fitted into the inner periphery of the end portion of the outer member, an inner diameter portion extending radially inward from the fitting portion, and the fitting A cored bar comprising a flange part extending radially outward from the part, a side lip integrally joined to the cored bar and extending obliquely outward in the radial direction, and radially outward on the inner diameter side of the side lip And a base member on the inner side of the wheel mounting flange, and a synthetic rubber seal member integrally formed with a grease lip extending inclined toward the inner side of the bearing. Is formed in a curved surface having an arcuate cross section, the side lip and the dust lip are slidably contacted with each other with a predetermined axial squeeze, the grease lip is slidably contacted with each other via a predetermined diametrical shimeshiro, and the flange Is opposed to the inner side surface of the wheel mounting flange via a slight axial clearance to form a labyrinth seal, and the flange portion is connected to the outer end surface of the outer member via a predetermined axial clearance. Facing each other, an annular drainage groove is formed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, FIG. 2A is an enlarged view of a main part showing a seal portion of FIG. 1, and FIG. ) Is a main part enlarged view showing a modification of FIG. 2, (c) is a main part enlarged view showing another modification of (a), and FIGS. 3 (a) to 3 (c) are other parts of FIG. 2 (a). The principal part enlarged view which shows a modification, and Fig.4 (a)-(d) are the principal part enlarged views which show another modification as same as the above. 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).

  This wheel bearing device is referred to as a third generation for a driven wheel, and includes an inner member 3 including a hub wheel 1 and an inner ring 2 press-fitted into the hub wheel 1, and a double row of the inner member 3. And an outer member 5 inserted through rolling elements (balls) 4 and 4.

  The hub wheel 1 integrally has a wheel mounting flange 6 for attaching a wheel (not shown) to an end portion on the outer side, one (outer side) inner rolling surface 1a on the outer periphery, and this inner rolling. A small-diameter step portion 1b extending in the axial direction from the surface 1a is formed. Further, hub bolts 6 a are implanted at circumferentially equidistant positions of the wheel mounting flange 6.

  The inner ring 2 is formed with the other (inner side) inner rolling surface 2a on the outer periphery, and is press-fitted into the small-diameter step portion 1b of the hub wheel 1 through a predetermined shimiro, and the end portion of the small-diameter step portion 1b is radially inserted. It is fixed in the axial direction in a state where a predetermined bearing preload is applied by a caulking portion 1c formed by plastic deformation outward.

  The hub wheel 1 is made of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and includes an inner rolling surface 1a and an inner side of a wheel mounting flange 6 that becomes a seal land portion of a seal 8 to be described later. The surface is hardened in the range of 58 to 64 HRC by induction hardening from the base 6b to the small diameter step 1b. The caulking portion 1c is an unquenched portion with the surface hardness after forging. On the other hand, the inner ring 2 and the rolling element 4 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core part by quenching.

  The outer member 5 integrally has a vehicle body mounting flange 5b to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and the inner rolling surfaces 1a and 2a of the inner member 3 on the inner periphery. Opposing double-row outer rolling surfaces 5a and 5a are integrally formed. Between these rolling surfaces 5a, 1a and 5a, 2a, double-row rolling elements 4, 4 are accommodated via a cage 7 so as to roll freely.

  The outer member 5 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least the double row outer rolling surfaces 5a and 5a are hardened in the range of 58 to 64 HRC by induction hardening. Has been processed. Further, seals 8 and 9 are attached to the opening of the annular space formed between the outer member 5 and the inner member 3, leakage of the lubricating grease enclosed inside the bearing to the outside, and rainwater from the outside And dust are prevented from entering the bearing.

  The seal 9 on the inner side of the seals 8 and 9 is disposed opposite to each other, and is an annular seal plate 10 that is press-fitted into the inner periphery of the inner end of the outer member 5 serving as a fixed member via a predetermined shimiro. The so-called pack seal is composed of a slinger 11 which is press-fitted into the outer diameter of the inner ring 2 serving as a rotation side member through a predetermined scissors. The outer-side seal 8 includes a cored bar 12 press-fitted into the inner periphery of the outer-side end portion of the outer member 5 through a predetermined shimiro, and a seal member 13 joined to the cored bar 12. It is composed of an integral seal.

  The metal core 12 of the seal 8 is formed into an annular shape by pressing from a steel plate having rust-preventing ability, such as an austenitic stainless steel plate (JIS standard SUS304 type) or a cold rolled steel plate (JIS standard SPCC type). Is formed. If the core metal 12 is formed by pressing from a steel plate having this type of rust prevention ability, rusting of the core metal 12 can be suppressed over a long period of time, and durability and sealing performance can be improved. .

  On the other hand, the seal member 13 is made of synthetic rubber such as NBR (acrylonitrile-butadiene rubber) and is integrally joined to the core metal 12 by vulcanization adhesion. As shown in an enlarged view in FIG. 2 (a), the seal member 13 has a side lip 13a extending inclined in the radially outward direction, and also inclined radially outward on the inner diameter side of the side lip 13a. The dust strip 13b that extends and the grease lip 13c that extends while inclining toward the inner side of the bearing are integrally provided.

  The base 6b on the inner side of the wheel mounting flange 6 is formed in a curved surface having an arc-shaped cross section. The side lip 13a and the dust lip 13b are slidably contacted with the base 6b with a predetermined axial squeeze, and the grease lip 13c is predetermined. Are in sliding contact with each other through a radial shimoshiro. In addition to NBR, the material of the seal member 13 is excellent in heat resistance and chemical resistance, such as HNBR (hydrogenated acrylonitrile butadiene rubber), EPDM (ethylene propylene rubber), etc., which have excellent heat resistance. Examples thereof include ACM (polyacrylic rubber), FKM (fluororubber), and silicon rubber.

  Here, in the present embodiment, the cored bar 12 extends inward in the radial direction from the cylindrical fitting portion 12a that is press-fitted into the inner periphery of the outer end of the outer member 5, and the fitting portion 12a. An inner diameter portion 12b to which the seal member 13 is joined and a disc-shaped flange portion 12c extending radially outward from the fitting portion 12a are provided. The flange portion 12c faces the inner side surface 6c of the wheel mounting flange 6 through a slight axial clearance, and the labyrinth seal 14 is configured. Further, the flange portion 12 c faces the outer end surface 5 c of the outer member 5 via a predetermined axial clearance, and an annular drain groove 15 is configured. As a result, it is possible to prevent the muddy water from being directly applied to the side lip 13a of the seal 8, and even if the muddy water is applied to the outer member 5 and travels along the outer peripheral surface thereof while the vehicle is running, the drainage groove 15 is so-called soot. Since the muddy water flows downward and is discharged, it can be prevented from flowing between the side surface 6c of the wheel mounting flange 6 and the durability and sealing performance of the seal 8 over a long period of time. Can be improved.

  The seal 16 shown in (b) is a modification of (a). The seal 16 basically differs from the seal 8 only in the configuration of the seal member, and other parts and portions having the same parts or functions having the same functions are denoted by the same reference numerals and detailed description thereof is omitted. .

  The seal 16 is an integrated seal comprising a cored bar 12 press-fitted into the inner periphery of the outer side end portion of the outer member 5 via a predetermined shimiro and a seal member 17 joined to the cored bar 12. It is configured. The seal member 17 is made of synthetic rubber such as NBR and is integrally joined to the cored bar 12 by vulcanization adhesion. The seal member 17 has a side lip 13a extending inclining outward in the radial direction, a dust lip 13b extending inwardly in the radial direction on the inner diameter side of the side lip 13a, and an inward bearing side. A grease lip 17a extending integrally is integrally provided.

  The base 6b on the inner side of the wheel mounting flange 6 is formed in a curved surface having an arc-shaped cross section. The side lip 13a and the dust lip 13b are slidably contacted with the base 6b with a predetermined axial squeeze, and the grease lip 17a is predetermined. Are arranged opposite to each other through a radial clearance. Thus, since the labyrinth seal is formed between the grease lip 17a and the base 6b, the sliding resistance of the seal 16 can be suppressed and the torque can be reduced.

  The seal 18 shown in (c) is another modification of (a). The seal 18 is basically different from the seal 8 only in the configuration of the core metal, and other parts and portions having the same parts or functions having the same functions are denoted by the same reference numerals and detailed description thereof is omitted. .

  The seal 18 is a one-piece seal composed of a metal core 19 press-fitted into the inner periphery of the outer end portion of the outer member 5 via a predetermined shimiro and a seal member 20 joined to the metal core 19. It is configured.

  The metal core 19 is formed in an annular shape by press working from a steel plate having rust prevention ability, such as an austenitic stainless steel plate (JIS standard SUS304 type) or a cold rolled steel plate (JIS standard SPCC type). A cylindrical fitting portion 19a that is press-fitted into the inner periphery of the outer end of the outer member 5, an inner diameter portion 12b that extends radially inward from the fitting portion 19a, and a radially outward direction from the fitting portion 19a. A disc-shaped flange portion 12c extending in the direction is provided.

  On the other hand, the seal member 20 is made of synthetic rubber such as NBR, and is integrally joined from the inner diameter part 12b of the cored bar 19 to a part of the fitting part 19a by vulcanization adhesion. Thus, since the seal member 20 goes around and is fixed to a part of the fitting portion 19a, the airtightness of the fitting portion with the outer member 5 is improved, and muddy water or the like from the outside from the fitting portion. Intrusion can be prevented.

  The seal shown in FIGS. 3A to 3C is another modification of FIG. These seals are basically different only in the configuration of the seal 8 and the flange portion of the core metal, and other parts and parts having the same parts or parts having the same functions are denoted by the same reference numerals and are described in detail. Is omitted.

  The seal 21 shown in (a) includes a cored bar 22 press-fitted into the inner periphery of the outer side end portion of the outer member 5 via a predetermined shimiro, and a seal member 13 joined to the cored bar 22. It is composed of an integral seal.

  The core metal 22 is formed in an annular shape by press working from a steel plate having rust prevention ability, such as an austenitic stainless steel plate (JIS standard SUS304 system) and a cold rolled steel plate (JIS standard SPCC system). A cylindrical fitting portion 12a that is press-fitted into the inner periphery of the outer side end of the outer member 5, an inner diameter portion 12b that extends radially inward from the fitting portion 12a, and a radially outward direction from the fitting portion 12a. A disc-shaped flange portion 22a extending in the direction of the angle.

  In the present embodiment, the outer diameter of the flange portion 22 a of the cored bar 22 is formed larger than the outer periphery of the outer end portion of the outer member 5. As a result, the flange portion 22a serves as a weir, and muddy water is applied to the outer member 5 during traveling of the vehicle, and flows between the outer peripheral surface and between the flange portion 22a and the side surface 6c of the wheel mounting flange 6. Therefore, the durability of the seal 21 and the sealing performance can be improved over a long period of time.

  The seal 23 shown in (b) is composed of a cored bar 24 press-fitted into the inner periphery of the outer side end portion of the outer member 5 via a predetermined scissors, and a seal member 13 joined to the cored bar 24. It is composed of an integral seal.

  The metal core 24 is formed in an annular shape by press working from a steel plate having rust prevention ability, such as an austenitic stainless steel plate (JIS standard SUS304 system) and a cold rolled steel plate (JIS standard SPCC system). A cylindrical fitting portion 12a that is press-fitted into the inner periphery of the outer side end of the outer member 5, an inner diameter portion 12b that extends radially inward from the fitting portion 12a, and the wheel mounting flange 6 from the fitting portion 12a. And a flange portion 24a extending obliquely toward the surface. The flange portion 24a faces the inner side surface 6c of the wheel mounting flange 6 via a slight axial clearance, and the labyrinth seal 14 is configured. Further, the flange portion 24 a faces the outer end surface 5 c of the outer member 5 via a predetermined axial clearance, and an annular drain groove 25 is configured.

  In the present embodiment, since the flange portion 24a of the cored bar 24 extends while being inclined toward the wheel mounting flange 6, the flange portion 24a serves as a weir, and muddy water is applied to the outer member 5 during traveling of the vehicle. Since it can be prevented from flowing between the flange portion 24a and the side surface 6c of the wheel mounting flange 6 along the outer peripheral surface, and the cross section of the drainage groove 25 is substantially triangular, The muddy water or the like transmitted through the outer peripheral surface of the outer member 5 can effectively flow downward, and the durability and sealing performance of the seal 23 can be improved over a long period of time.

  The seal 26 shown in (c) includes a cored bar 27 press-fitted into the inner periphery of the outer side end portion of the outer member 5 via a predetermined shimiro, and a seal member 13 joined to the cored bar 27. It is composed of an integral seal.

  The core metal 27 is formed in an annular shape by press working from a steel plate having rust prevention ability, such as an austenitic stainless steel plate (JIS standard SUS304 system) or a cold rolled steel plate (JIS standard SPCC system). A cylindrical fitting portion 12a that is press-fitted into the inner periphery of the outer side end of the outer member 5, an inner diameter portion 12b that extends radially inward from the fitting portion 12a, and a radially outward direction from the fitting portion 12a. And a flange portion 27c extending in the radial direction from the flange portion 27a via the cylindrical portion 27b. The flange portion 27a extends closely to the outer end surface 5c of the outer member 5. The flange portion 27c faces the inner side surface 6c of the wheel mounting flange 6 through a slight axial clearance, and the labyrinth seal 14 is configured. Further, the flange portion 27 c faces the outer end surface 5 c of the outer member 5 through a predetermined axial clearance, and an annular drain groove 15 is configured.

  In the present embodiment, the cored bar 27 is formed in a stepped shape, and the collar part 27a is in close contact with the end surface 5c on the outer side of the outer member 5, so that the strength and rigidity of the cored bar 27 itself increases, It is possible to prevent deformation or damage due to collision or the like, and improve the positioning accuracy of the core metal 27 in the press-fitting process.

  The seal shown in FIGS. 4A to 4D is another modification of FIG. Note that these seals basically differ only in the configuration of the seal 8 and the flange portion, and other parts and parts having the same parts or parts having the same functions are denoted by the same reference numerals and detailed description thereof is omitted. .

  The seal 28 shown in (a) is composed of a core metal 29 press-fitted into the inner periphery of the outer side end portion of the outer member 5 via a predetermined scissors, and a seal member 30 joined to the core metal 29. It is composed of an integral seal.

  The core metal 29 is formed in an annular shape by press working from a steel plate having rust prevention ability, such as an austenitic stainless steel plate (JIS standard SUS304 system) and a cold rolled steel plate (JIS standard SPCC system). A cylindrical fitting portion 29a that is press-fitted into the inner periphery of the outer end of the outer member 5 and an inner diameter portion 12b that extends radially inward from the fitting portion 29a are provided.

  The seal member 30 is made of a synthetic rubber such as NBR, and is integrally joined to the core metal 29 by vulcanization adhesion. The side lip 13a extends obliquely outward in the radial direction, and the radial direction on the inner diameter side of the side lip 13a is the same. A dust lip 13b extending obliquely outward, a grease lip 13c extending obliquely inward of the bearing, and a seal base covered from the side lip 13a to the inner surface of the fitting portion 29a of the metal core 29 31 is integrated. Here, a flange portion 31b extending outward in the radial direction from the seal base portion 31 via the cylindrical portion 31a is continuously formed.

  In the present embodiment, a flange portion 31b is formed integrally with the seal member 30, and the flange portion 31b faces the inner side surface 6c of the wheel mounting flange 6 via a slight axial clearance, whereby the labyrinth seal 14 is configured. At the same time, the flange portion 31 b faces the outer end surface 5 c of the outer member 5 via a predetermined axial clearance, and the annular drainage groove 15 is configured. As a result, it is possible to prevent muddy water from being directly applied to the side lip 13a of the seal 28, and even if muddy water is applied to the outer member 5 and travels along the outer peripheral surface thereof while the vehicle is running, it flows downward by the drainage groove 15. Therefore, it is possible to prevent the fluid from flowing between the side surface 6 c of the wheel mounting flange 6. Furthermore, since the flange portion 31b is formed integrally with the sealing member 30 made of an elastic member, it can be prevented from being deformed or damaged due to a collision of scattered objects.

  The seal 32 shown in (b) is composed of a core metal 33 press-fitted into the inner periphery of the outer side end portion of the outer member 5 via a predetermined scissors, and a seal member 34 joined to the core metal 33. It is composed of an integral seal.

  The core metal 33 is formed in an annular shape by press working from a steel plate having rust prevention ability, such as an austenitic stainless steel plate (JIS standard SUS304 type) or a cold rolled steel plate (JIS standard SPCC type). A cylindrical fitting portion 12a that is press-fitted into the inner circumference of the outer side end of the outer member 5 and an inner diameter portion 12b that extends radially inward from the fitting portion 12a are provided.

  The seal member 34 is made of a synthetic rubber such as NBR, and is integrally joined to the cored bar 33 by vulcanization adhesion. The side lip 13a extends obliquely outward in the radial direction, and the radial direction on the inner diameter side of the side lip 13a. A dust lip 13b extending obliquely outward, a grease lip 13c extending obliquely inward of the bearing, and a seal base covered from the side lip 13a to the inner surface of the fitting portion 12a of the cored bar 33 35 is integrated. Here, a flange portion 35a extending radially outward from the seal base portion 35 is formed continuously.

  In the present embodiment, a flange portion 35a is formed integrally with the seal member 34, the flange portion 35a faces the inner side surface 6c of the wheel mounting flange 6 via a slight axial clearance, and the labyrinth seal 14 is configured. At the same time, the flange portion 35 a faces the end surface 5 c on the outer side of the outer member 5 via a predetermined axial clearance, and an annular drain groove 15 is configured. As a result, it is possible to prevent the muddy water from being directly applied to the side lip 13a of the seal 32, and even if muddy water is applied to the outer member 5 and travels along the outer peripheral surface during traveling of the vehicle, it flows downward by the drainage groove 15. Therefore, it is possible to prevent the fluid from flowing between the side surface 6 c of the wheel mounting flange 6. Furthermore, since the flange portion 35a is formed integrally with the sealing member 34 made of an elastic member, it can be prevented from being deformed or damaged due to a collision of scattered objects.

  The seal 36 shown in (c) is composed of a core metal 37 press-fitted into the inner periphery of the outer side end portion of the outer member 5 via a predetermined shimiro, and a seal member 38 joined to the core metal 37. It is composed of an integral seal.

  The core metal 37 is formed in an annular shape by press working from a steel plate having rust prevention ability, such as an austenitic stainless steel plate (JIS standard SUS304 type) or a cold rolled steel plate (JIS standard SPCC type), A cylindrical fitting portion 37a that is press-fitted into the inner periphery of the outer side end of the outer member 5, an inner diameter portion 12b that extends radially inward from the fitting portion 37a, and a radially outward direction from the fitting portion 37a. And a tongue piece 37c protruding from the flange portion 37b in the axial direction.

  The seal member 38 is made of a synthetic rubber such as NBR, and is integrally joined to the cored bar 37 by vulcanization adhesion. The side lip 13a extends obliquely outward in the radial direction, and the radial direction on the inner diameter side of the side lip 13a. A dust lip 13b extending inclined outward, a grease lip 13c extending inclined toward the inner side of the bearing, and covering from the side lip 13a to the outer surface of the tongue 37c from the fitting portion 12a of the metal core 37 The seal base 39 is integrally formed. Here, a flange portion 39a extending radially outward from the seal base portion 39 is continuously formed.

  In this embodiment, a flange portion 39a is formed integrally with the seal member 38, the flange portion 39a faces the inner side surface 6c of the wheel mounting flange 6 via a slight axial clearance, and the labyrinth seal 14 is configured. At the same time, the flange portion 39a faces the outer end surface 5c of the outer member 5 via a predetermined axial clearance, and the annular drainage groove 15 is configured. Accordingly, it is possible to prevent muddy water from being directly applied to the side lip 13a of the seal 36, and the flange portion 39a is integrally formed with the seal member 38 made of an elastic member. Can be prevented. Further, since the outer surface of the flange 37b and the tongue piece 37c of the exposed metal core 37 is formed integrally with the sealing member 38 made of an elastic member, the airtightness of the fitting portion between the metal core 37 and the outer member 5 is formed. Improves.

  The seal 40 shown in (d) is composed of a cored bar 12 press-fitted into the inner periphery of the outer side end portion of the outer member 5 through a predetermined shimiro, and a seal member 41 joined to the cored bar 12. It is composed of an integral seal.

  The seal member 41 is made of a synthetic rubber such as NBR, and is integrally joined to the cored bar 12 by vulcanization adhesion. The side lip 13a extends obliquely outward in the radial direction, and the radial direction on the inner diameter side of the side lip 13a is the same. The dust lip 13b extending obliquely outward, the grease lip 13c extending obliquely inward of the bearing, and the covering portion 42 formed over the outer surface of the cored bar 12 are integrally provided.

  In this embodiment, since the outer surface of the cored bar 12 is covered with the sealing member 41 made of an elastic member, the airtightness of the fitting portion between the cored bar 12 and the outer member 5 is improved, and the cored bar 12 is Even if an inexpensive cold rolled steel plate or the like is used without using an expensive steel plate such as stainless steel having rust prevention ability, there is no risk of rusting and cost reduction can be achieved.

  FIG. 5 is an enlarged view showing a main part of a second embodiment of the wheel bearing device according to the present invention. This embodiment is basically the same as the first embodiment (FIG. 2) described above, except that a metal ring that is basically a seal land portion is added, and the same parts and the same function as those of the other embodiments described above. The parts and parts having the same reference numerals are given the same reference numerals, and detailed description thereof is omitted.

  The seal 8 is an integral seal comprising a cored bar 12 press-fitted into the inner periphery of the outer side end portion of the outer member 5 via a predetermined shimoshiro and a seal member 13 joined to the cored bar 12. It is configured. This seal member 13 is integrally joined to the cored bar 12 by vulcanization adhesion, and extends sideways lip 13a extending obliquely outward in the radial direction, and also extending inclinedly outwardly in the radial direction on the inner diameter side of the side lip 13a. The dust lip 13b and a grease lip 13c extending obliquely inward of the bearing are integrally provided.

  In the present embodiment, the side lip 13a, the dust lip 13b, and the grease lip 13c are in sliding contact with a metal ring 43 fitted to the base portion 6b on the inner side of the wheel mounting flange 6. The metal ring 43 is pressed from a corrosion-resistant steel plate, such as an austenitic stainless steel plate (JIS standard SUS304 type or the like), or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). A curved portion 43a formed in an arc shape corresponding to the base portion 6b on the inner side of the wheel mounting flange 6 formed in a circular arc shape, and extending radially outward from the curved portion 43a. A disc portion 43b that is in close contact with the inner side surface 6c of the flange 6, a cylindrical umbrella portion 43c that extends away from the outer diameter portion of the disc portion 43b in the axial direction with respect to the wheel mounting flange 6, And a bent portion 43d formed to protrude radially outward from the umbrella portion 43c.

  The umbrella portion 43 c faces the outer periphery of the outer end portion of the outer member 5 through a slight radial clearance to form a labyrinth seal 44. The labyrinth seal 44 and the flange portion 12c of the metal core 12 can prevent muddy water or the like from directly entering the sliding contact portion between the seal 8 and the metal ring 43, and the outer member 5 while the vehicle is running. Even if muddy water is applied to the outer peripheral surface, it flows downward through the drainage groove 15 and is discharged, so that the durability and sealing performance of the seal 8 can be improved over a long period of time. . Further, the bending portion 43d increases the rigidity of the umbrella portion 43c, and it is possible to prevent deformation and damage due to collision of scattered objects.

  In this metal ring 43, the surface roughness of the steel plate as the material is set in the range of Ra 0.2 to 0.6. Thereby, a favorable seal sliding contact surface can be obtained, lip wear can be suppressed, and the sealing performance of the seal 8 can be maintained even when used in a poor environment. Note that Ra is one of JIS roughness shape parameters (JIS B0601-1994), and is an arithmetic average roughness, which means an average value of absolute value deviations from an average line.

  The base 6b is formed on an arc surface having a predetermined radius of curvature r. Corresponding to this arc surface, the curved portion 43a of the metal ring 43 is formed of an arc surface having a predetermined curvature radius R, and the respective curvature radii R and r are set such that R ≧ r. Thus, when the metal ring 43 is fitted to the base portion 6b, the curved portion 43a of the metal ring 43 is prevented from interfering with the arc surface of the base portion 6b and rising. Therefore, a gap is prevented from being generated between the side surface 6c of the wheel mounting flange 6 and the disc portion 43b of the metal ring 12, and both are brought into close contact with each other, and variations in the side lips 13a, the dust lip 13b, and the grease lip 13c are uneven. Stable sealing performance can be ensured by suppressing.

  FIG. 6 is an enlarged view showing a main part of a third embodiment of the wheel bearing device according to the present invention. This wheel bearing device is referred to as a second generation for driving wheels. An inner member 47 including a hub wheel 45 and a pair of inner rings 46 press-fitted into the hub wheel 45, and the inner member 47 are combined with each other. And an outer member 49 inserted through rolling elements (conical rollers) 48 and 48 in a row. A seal 50 is attached to the opening on the outer side of the annular space formed between the outer member 49 and the inner member 47, leakage of the lubricating grease sealed inside the bearing, rainwater and It prevents dust and the like from entering the bearing.

  The hub wheel 45 integrally has a wheel mounting flange 6 at an end portion on the outer side, and a small-diameter step portion (not shown) extending in an axial direction from the wheel mounting flange 6 is formed on the outer periphery. 46 is press-fitted and fixed. The inner ring 46 is formed with a tapered inner rolling surface 46a on the outer periphery, and a large collar 46b for guiding the rolling element 48 is integrally formed on the larger diameter side of the inner rolling surface 46a.

  The hub wheel 45 is formed of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the like from the base part 6b on the inner side of the small diameter stepped wheel mounting flange 6 to the small diameter stepped part via the shoulder part 45a. Thus, the surface is hardened in the range of 50 to 64 HRC by induction hardening. On the other hand, the inner ring 46 and the rolling element 48 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core portion by quenching.

  The outer member 49 integrally has a vehicle body mounting flange (not shown) on the outer periphery, and has tapered double-row outer rolling surfaces 49a and 49a facing the inner rolling surface 46a of the inner ring 46 on the inner periphery. It is integrally formed. Double row rolling elements 48, 48 are accommodated between the rolling surfaces 49a, 46a via a cage 51 so as to roll freely.

  The outer member 49 is formed of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least the double row outer rolling surfaces 49a and 49a are hardened in the range of 58 to 64 HRC by induction hardening. Has been processed.

  The outer-side seal 50 is a so-called pack seal, which is arranged so as to face each other and includes an annular seal plate 52 fitted inside the outer-side end of the outer member 49 and a slinger 53 fitted outside the inner ring 46. It consists of

  The seal plate 52 includes a metal core 54 and a seal member 55 joined to the metal core 54 by vulcanization adhesion. The core metal 54 is used for press working from a corrosion-resistant steel plate, for example, an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). A cylindrical fitting portion 54a that is formed in a substantially crank shape in cross section and press-fitted into the outer member 49, an inner diameter portion 54b that extends radially inward from the fitting portion 54a, and a radial direction from the fitting portion 54a. And a disc-shaped flange portion 54c extending outward. On the other hand, the seal member 55 is made of a synthetic rubber such as NBR, and has a pair of side lip 55a and 55b extending obliquely outward in the radial direction and a grease lip 55c extending inclined inward in the radial direction.

  The slinger 53 is a corrosion-resistant steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 series or the like), an austenitic stainless steel plate (JIS standard SUS304 series or the like), or a rust-proof cold rolled steel. A cylindrical fitting portion 53a formed into a substantially L-shaped cross section by pressing from a collar (such as a JIS standard SPCC system) and press-fitted into the outer diameter of the inner ring 46 via a predetermined shimiro, and this fitting And a standing plate portion 53b extending radially outward from the portion 53a. The side lips 55a and 55b are slidably in contact with the standing plate portion 53b of the slinger 53 via a predetermined axial shimiro, and the grease lip 55c is slidably in contact with the fitting portion 53a via a predetermined radial shimiro.

  Here, in the present embodiment, the labyrinth seal 14 is configured by the flange portion 54c of the metal core 54 facing the inner side surface 6c of the wheel mounting flange 6 via a slight axial clearance. In addition, the flange portion 54 c faces the outer end surface 5 c of the outer member 49 via a predetermined axial clearance, and the annular drainage groove 15 is configured. As a result, it is possible to prevent muddy water from being directly applied to the side lip 55a of the seal 50, and even if muddy water is applied to the outer member 49 and travels along the outer peripheral surface while the vehicle is running, it flows downward by the drainage groove 15. Therefore, the durability and sealing performance of the seal 50 can be improved over a long period.

  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. 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.

  The wheel bearing device according to the present invention is the second generation or the second generation in which a seal is attached to an opening of an annular space formed between an inner member serving as a rotation side member and an outer member serving as a stationary member. It can be applied to a fourth-generation wheel bearing device.

DESCRIPTION OF SYMBOLS 1, 45 Hub wheel 1a, 2a, 46a Inner rolling surface 1b Small diameter step part 1c Clamping part 2, 46 Inner ring 3, 47 Inner member 4, 48 Rolling element 5, 49 Outer member 5a, 49a Outer rolling surface 5b Car body mounting flange 5c Outer member outer side end surface 6 Wheel mounting flange 6a Hub bolt 6b Wheel mounting flange inner side base 6c Wheel mounting flange inner side surface 7, 51 Cage 8, 16, 18, 21, 23, 26, 28, 32, 36, 40, 50 Outer side seal 9 Inner side seal 10, 52 Seal plate 11, 53 Slinger 12, 19, 22, 24, 27, 29, 33, 37, 54 Core 12a, 19a, 29a, 37a, 53a, 54a Fitting portion 12b, 54b Inner diameter portion 12c, 22a, 24a, 27c, 31b, 35a, 39a, 54c Flange 13, 17, 20, 30, 34, 38, 41, 55 Seal members 13a, 55a, 55b Side lip 13b Dustrips 13c, 17a, 55c Grease lip 14, 44 Labyrinth seals 15, 25 Drain grooves 27a, 37b Gutter 27b , 31a Cylindrical part 31, 35 Seal base part 37c Tongue piece 42 Covering part 43 Metal ring 43a Curved part 43b Disk part 43c Umbrella part 43d Bent part 45a Shoulder part 46b Large collar part 53b Standing plate part 100 Outer member 100a Outer roll Running surface 100b Outer peripheral surface 101 Cage 102 Ball 103 Hub wheel 103a Inner rolling surface 104 Wheel mounting flange 104a Side surface of wheel mounting flange 105 Seal structure 106 Core metal 106a Weir member 107 Elastic seal body 108 Axial lip portion 109 Radial lip portion r Base radius of curvature R Curve of metal ring The radius of curvature of the

Claims (15)

An outer member integrally having a vehicle body mounting flange for being attached to the knuckle on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end, and a small diameter step portion extending in the axial direction on the outer periphery, and a small diameter step portion of the hub wheel are fitted, An inner member formed of an outer ring member of an inner ring or a constant velocity universal joint formed with an inner rolling surface facing the outer rolling surface;
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
In a wheel bearing device comprising a seal mounted in an opening of an annular space formed between the outer member and the inner member,
Out of the seals, the outer side seal is a cylindrical fitting portion press-fitted into the inner periphery of the end portion of the outer member, a core bar having an inner diameter portion extending radially inward from the fitting portion, and this A seal member having a side lip that is integrally joined to the metal core and extends obliquely outward in the radial direction,
A flange portion extending radially outward from the fitting portion of the core metal is formed, and this flange portion faces the inner side surface of the wheel mounting flange via a slight axial clearance to form a labyrinth seal. The wheel bearing device is characterized in that the flange portion faces the outer end surface of the outer member via a predetermined axial clearance to form an annular drain groove.   The wheel bearing device according to claim 1, wherein the flange portion is integrally formed with the core metal by pressing from a steel plate.   The wheel bearing device according to claim 1 or 2, wherein the flange portion is formed to have a larger diameter than an outer periphery of an outer end portion of the outer member.   The wheel bearing device according to any one of claims 1 to 3, wherein the flange portion extends while being inclined toward the wheel mounting flange.   The wheel bearing device according to any one of claims 1 to 4, further comprising a flange portion that extends radially outwardly and closely contacts an outer end surface of the outer member between the fitting portion and the flange portion. .   The wheel bearing device according to any one of claims 1 to 5, wherein the seal member is fixed around a part of the fitting portion of the cored bar.   The wheel bearing device according to any one of claims 1 to 6, wherein the seal member is continuously covered from a fitting portion of the core metal to a flange portion.   8. The wheel according to claim 1, wherein the seal member is covered over an inner surface of the fitting portion, and the flange portion is formed integrally with the seal member. Bearing device.   A base portion on the inner side of the wheel mounting flange is formed in a curved surface having an arcuate cross section, and the seal member extends on an inner diameter side of the side lip and extends radially inwardly and on a bearing inner side. A grease lip extending in an inclined manner is integrally provided, the side lip and dust lip are slidably contacted with the base portion with a predetermined axial squeeze, and the grease lip is slidably contacted with each other via a predetermined radial squeeze. Item 15. A wheel bearing device according to any one of Items 1 to 8.   A base portion on the inner side of the wheel mounting flange is formed in a curved surface having an arc-shaped cross section, and a metal ring is fitted to the base portion, and the seal member is inclined radially outward toward the inner diameter side of the side lip. A dust lip extending inward and a grease lip extending obliquely inward of the bearing, the side lip and the dust lip are slidably contacted with the metal ring with a predetermined axial direction, and the grease lip has a predetermined diameter. The wheel bearing device according to any one of claims 1 to 8, wherein the wheel bearing device is slidably contacted with each other via a direction shimoshiro.   A curved portion formed in an arc shape corresponding to the curved surface of the base portion, and a disc portion extending radially outward from the curved portion and being in close contact with an inner side surface of the wheel mounting flange; And an umbrella part extending axially away from the wheel mounting flange from the outer diameter part of the disk part, and the umbrella part is slightly along the outer periphery of the outer side end of the outer member. The wheel bearing device according to claim 10, wherein a labyrinth seal is configured to confront each other through an annular clearance.   The wheel bearing device according to claim 11, wherein the metal ring has a bent portion that protrudes radially outward from the umbrella portion.   The base is formed with a predetermined radius of curvature r, the curved portion of the metal ring is formed with a predetermined radius of curvature R, and the curvature radii R and r are set such that R ≧ r. Item 13. A wheel bearing device according to Item 10.   The wheel bearing according to any one of claims 10 to 13, wherein the metal ring is formed of a steel plate having corrosion resistance, and a surface roughness of the steel plate as a raw material is set in a range of Ra 0.2 to 0.6. apparatus.   The seal is disposed opposite to each other, the core metal fitted into the end of the outer member, an annular seal plate made of a seal member integrally joined to the core metal, and the inner member It is composed of a pack seal composed of a slinger that is externally fitted, and the slinger is a cylindrical fitting portion that is press-fitted into the inner member via a predetermined shimoshiro, and radially outward from the fitting portion. The seal member is integrally formed with a side lip extending obliquely outward in the radial direction on the inner diameter side of the side lip and a grease lip extending inclined toward the bearing inward side. 9. The side lip is slidably contacted with a standing plate portion of the slinger with a predetermined axial squeezing force, and the grease lip is slidably contacted with a fitting portion of the slinger via a predetermined radial squeezing force. Izu Crab according to the wheel support bearing assembly.

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