JP2010060126A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved rolling bearing device with a reduced intruding amount of foreign matter and an enhanced sealing function. <P>SOLUTION: In the rolling bearing device, a one end face 2a1 on the vehicle outer side of an outer ring 2a is opposingly disposed with respect to a side face 3c of a hub flange 3b. A prescribed gap S is provided between the side face 3c of the hub flange 3b and the one end face 2a1 of the outer ring 2a. A sealing device 8 includes a core bar 8a press-fitted to an inner peripheral face 2a of the outer ring 2a. The core bar 8a includes an axial lip 8b composed of a rubber-like elastic member slidable with respect to the hub flange 3b. An outer flange part 8d bent from the vehicle outer side of a core bar cylinder part 8c press-fitted to an inner peripheral face 2a3 of the outer ring 2a and extending further outward than the outer diameter of the outer ring 2a through the gap S is formed on the core bar 8a. A labyrinth seal part 10 is formed by the outer flange part 8d and the side face 3c of the hub flange 3b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rolling bearing device used for a vehicle such as an automobile.

  Rolling bearing devices for attaching tire wheels and brake disks are used in vehicles such as automobiles. This rolling bearing device includes an outer ring fixed to the vehicle body side, an inner ring arranged concentrically with the outer ring and provided with a wheel mounting flange, and a rolling element interposed between the outer ring and the inner ring. I have. Furthermore, if foreign matter such as sand or snow-melting muddy water enters the bearing part between the inner ring and outer ring, the filled grease will deteriorate or other components will rust and the bearing part itself will become rusted. In order to reduce the service life, a rolling bearing device is known in which a sealing device is disposed in the bearing portion (see Patent Document 1).

JP 2008-64296 A

  A sealing device for a rolling bearing device as disclosed in Patent Document 1 includes a core bar that is press-fitted into an inner peripheral surface of an outer ring, a radial lip that is in sliding contact with the outer peripheral surface of the inner ring, and an axial lip that is in sliding contact with a flange for mounting a wheel. It has. However, there is a gap between the axial side surface of the inner ring flange and the end surface of the outer ring in the axial direction, and this gap is directly open to the outside. It is easy, and depending on the amount of the foreign matter intruding, there is a possibility that a sufficient sealing function cannot be exhibited.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a rolling bearing device improved so as to reduce the intrusion amount of foreign matter and improve a sealing function and the like.

Means for Solving the Problems and Effects of the Invention

  In order to solve the above problems, a rolling bearing device of the present invention includes an outer ring connected to a vehicle fixing member on the vehicle inner side, an inner ring having a hub flange connected to a wheel on the vehicle outer side, the inner ring, A rolling bearing device comprising: a rolling element interposed between an outer ring and a sealing device that is provided at least on the vehicle outer side and seals between the inner ring and the outer ring from the outside. One end surface of the vehicle outer side is disposed opposite to the side surface of the hub flange, and a predetermined gap is provided between the side surface of the hub flange and one end surface of the outer ring. It has a metal core that is press-fit into the inner peripheral surface, the metal core has an axial lip made of a rubber-like elastic member that is slidable with respect to the hub flange, On the inner peripheral surface of the outer ring An outer flange portion that is bent from the vehicle outer side of the core metal cylinder portion to be fitted and extends outwardly from the outer diameter of the outer ring through the gap is formed, and the outer flange portion and the side surface of the hub flange And a labyrinth seal portion is formed.

  By adopting the above configuration, a non-contact type labyrinth seal portion is formed in a gap where foreign matter can easily enter by press-fitting the core metal constituting the sealing device into the outer ring. The amount of intrusion itself can be reduced. As a result, the sealing load on the axial lip is reduced, and the sealing function as a sealing device can be improved. Moreover, since the outer flange part constituting the labyrinth seal part is formed by bending from the cored bar cylinder part of the cored bar, it is possible to employ sheet metal processing by a press with a low processing cost. Further, since the labyrinth seal portion is non-contact, there is no seal sliding resistance, only sliding resistance due to the axial lip, and there is an effect that it is possible to provide a rolling bearing device that reduces the seal sliding resistance.

  In order to solve the above-described problems, the rolling bearing device of the present invention is formed by bending a core metal tube portion of the core metal from a vehicle inner side and forming an abutment surface on an inner flange portion extending to the inner ring side. When the core metal is press-fitted to the outer ring, the contact surface is brought into contact with a receiving end surface formed continuously with the inner peripheral surface of the outer ring on which the core metal cylinder portion is press-fitted and fitted. As a result, the contact surface of the inner flange portion of the metal core is brought into contact with the receiving end surface of the outer ring with high processing accuracy, and the contact portion is a surface contact. Therefore, positioning accuracy when the sealing device is incorporated into the outer ring As a result, a rolling bearing device can be provided that can be assembled without impairing the sealing function of the labyrinth seal portion constituted by the outer flange portion and the side surface of the hub flange.

  In order to solve the above-described problems, the rolling bearing device according to the present invention is characterized in that the contact state between the receiving end surface of the outer ring and the contact surface of the core metal is a metal contact. A rolling bearing device with good accuracy can be provided.

  In order to solve the above problems, the rolling bearing device of the present invention is characterized in that a rust-preventing film is formed on an externally exposed surface that comes into contact with the outside air in a state where the core metal is press-fitted into the outer ring. Since a rust preventive film is formed at a location exposed to the outside air, a rolling bearing device that can prevent rusting of a metal core made of a metal sheet metal material and improve durability as a sealing device. Can be provided.

  In addition, as a rolling bearing device, a jetty can be formed to project from the position outside the outer diameter of the outer flange portion of the core metal to the vehicle inner side so as to cover the gap from the side surface of the hub flange. Therefore, since the jetty is disposed on the hub flange on the rotating side as an obstacle in the intrusion path of the foreign matter that is to enter directly into the gap, the intrusion path is lengthened and the hub flange is rotated. Foreign matter that contacts the jetty can be removed by centrifugal force, which reduces the amount of foreign matter entering the gap, and coupled with the above effects, the seal load on the axial lip is reduced, further improving the sealing function as a sealing device. be able to.

  In addition, as a rolling bearing device, the inner peripheral surface of the jetty is tapered so that the inner side of the vehicle is formed with a large diameter. Even if foreign matter reaches the inner peripheral surface of the jetty, the inner peripheral surface is tapered. Therefore, foreign matter can be removed by centrifugal force due to the rotation of the hub flange, which reduces the intrusion amount of foreign matter into the gap, thus reducing the sealing load on the axial lip and further improving the sealing function as a sealing device. Can be made.

  In addition, as a rolling bearing device, a rib ridge that protrudes toward the inner side of the vehicle is formed on the outer diameter side of the outer flange portion, and this rib ridge transmits the outer diameter side of the outer ring to the outer flange portion side. Since the movement of the foreign matter to be moved can be restricted, the amount of foreign matter entering the gap can be reduced, so that the sealing load on the axial lip is reduced, and the sealing function as the sealing device can be further improved.

  Moreover, as a rolling bearing device, the rust preventive film is made of a rubber-like elastic member which is a material of the axial lip, so that the axial lip and the rust preventive film can be formed simultaneously, and the processing process can be simplified. . In addition, the sliding surface that contacts the seal lip can be subjected to a surface modification treatment to form a surface-modified film, which prevents rusting of the sliding surface and reduces seal sliding resistance. In order to reduce, the sealing function as a sealing device can be improved.

  Further, as a rolling bearing device, a chamfered portion is formed between the inner peripheral surface of the outer ring into which the core metal is press-fitted and the one end surface of the outer ring, and the core is pressed when the core metal is press-fitted. A gold anticorrosive coating is installed to fill the chamfered portion, preventing foreign material from entering the outer ring inner diameter and the inner ring of the outer ring and the press-fitting location of the metal core of the sealing device. can do.

Sectional drawing which shows the attachment state of the rolling bearing apparatus of this invention. Sectional drawing which shows the other example of the attachment state of a rolling bearing apparatus. The principal part enlarged view which shows the mounting location of the sealing device of a vehicle inner. The principal part enlarged view which shows the externally exposed surface in a sealing device. The principal part enlarged view which shows the other example of the mounting location of the sealing device of a vehicle inner. The principal part enlarged view which shows the other example of the mounting location of the sealing device of a vehicle inner. The principal part enlarged view which shows the other example of the mounting location of the sealing device of a vehicle inner. The principal part enlarged view which shows the other example of the mounting location of the sealing device of a vehicle inner. The principal part enlarged view which shows the other example of the mounting location of the sealing device of a vehicle inner. The principal part enlarged view which shows the other example of the mounting location of the sealing device of a vehicle inner.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a cross-sectional view of a mounted state of a rolling bearing device according to the present invention. In FIG. 1, a rolling bearing device 1 includes an outer ring 2a as a fixed ring made of bearing steel, an inner ring 2b as a rotating ring, and a plurality of rows arranged between the inner ring 2b and the outer ring 2a. A rolling bearing 2 composed of a moving body 2c is provided.

  The inner ring 2b is formed integrally with the hub 3. The hub 3 is provided with a disk-shaped hub flange 3b that is fixed to a hub bolt 3a for mounting so as to be connected to a wheel (not shown) on the outer side of the vehicle, and projects outward. The hub flange 3b is integrally formed on the outer periphery of one end portion (vehicle outer side) of the shaft portion 2b1 constituting the inner ring 2b. A small-diameter portion 2b2 having an outer diameter that is one step smaller is formed at the other end portion (vehicle inner side) of the shaft portion 2b1. The small-diameter portion 2b2 is press-fitted and fixed with an inner ring divided body 2b4 that includes a rolling surface 2b3 that is formed as a separate body and on which one rolling element 2c whose outer peripheral surface is arranged in a plurality of rows rolls. A rolling surface 2b5 on which the other rolling elements 2c arranged in a plurality of rows roll is formed on the outer peripheral surface between one end and the other end of the shaft 2b1. Thus, the inner ring | wheel division body 2b4 is press-fit and integrated with the other end part of the axial part 2b1, and the inner ring | wheel 2b provided with the hub flange 3b in the one end part is comprised.

  Further, one end surface 2a1 of the outer ring 2a on the vehicle outer side is disposed to face the side surface 3c of the hub flange 3b, and a predetermined gap S is formed between the side surface 3c of the hub flange 3b and one end surface 2a1 of the outer ring 2a. Is provided.

  The shaft portion 2b1 of the inner ring 2b is formed with a connection insertion hole 2b6 to which a drive shaft 4 as a drive shaft for transmitting power is splined. The drive shaft 4 is passed through the connecting insertion hole 2b6 so that power can be transmitted. Then, the shaft end surface 4a of the drive shaft 4 is brought into contact with the inner ring end surface 2b7 on the vehicle inner side of the inner ring divided body 2b4 facing the shaft end surface 4a so that the end of the drive shaft 4 on the extending side is It is fixed by screwing a nut 5 as a screw fastening means.

  Moreover, although this example is the rolling bearing device 1 on the drive wheel side, in the case where the connecting insertion hole 2b6 is not formed in the shaft portion 2b1, the other end side of the shaft portion 2b1 is externally connected as shown in FIG. Rolling bearing device for a driven wheel, which is fixed so that it does not come out in the axial direction Z by a caulking portion 2b8 formed by plastic deformation outward in the radial direction so that the other end side is caulked. It can also be 1.

  Returning to FIG. 1, the rolling bearing 2 is connected to an attachment port 6 a of a vehicle fixing member 6 such as a knuckle or an axle housing on a vehicle inner side of a suspension device in a vehicle. In this connection, the outer ring 2a of the rolling bearing 2 is inserted and fitted into the mounting opening 6a, and the flange 2a2 protruding outward from the outer ring 2a is fixed to the vehicle via a fastening member 7 such as a bolt and a nut. The member 6 is fixed to the peripheral surface (vehicle outer side) of the attachment port 6a.

  The rolling bearing 2 is provided with sealing devices 8 and 9 for sealing the annular space chamber 2d between the outer ring 2a and the inner ring 2b from the outside. The sealing devices 8 and 9 are provided on both ends of the rolling bearing 2 in the axial direction Z. Further, grease is sealed in the annular space 2d inside the bearing between the inner ring 2b and the outer ring 2a.

  Further, as shown in FIG. 3, the sealing device 8 provided at least on the outer side of the vehicle has a metal core 8a that is press-fitted to the inner peripheral surface 2a3 of the outer ring 2a. The metal core 8a has an axial lip 8b made of a rubber-like elastic member that is slidable with respect to the seal sliding surface 3c1 that is a part of the side surface 3c of the hub flange 3b.

  The core metal 8a is formed in an annular shape as a whole by a metal plate made of metal such as a steel plate. A cylindrical cored bar portion 8c that is press-fitted and fitted to the inner peripheral surface 2a3 of the outer ring 2a is formed. An outer flange portion 8d is formed which is bent from the outer side of the cored bar portion 8c and extends outwardly from the outer diameter of the outer ring 2a through the gap S. A labyrinth seal portion 10 is formed by both the outer flange portion 8d and the side surface 3c of the hub flange 3b. The distance X between the outer flange portion 8d constituting the labyrinth seal portion 10 and the side surface 3c of the hub flange 3b is set to such a size that the two cooperate to exert a labyrinth seal function.

  Further, an inner flange portion 8e that is bent from the vehicle inner side of the cored bar cylinder portion 8c in the cored bar 8a and extends toward the inner ring 2b side is provided. An axial lip 8b extending to the outer side of the vehicle is vulcanized and bonded to the inner flange portion 8e, and a radial lip 8k extending to the inner side (radial direction) on the inner ring 2a side is vulcanized and bonded. Yes. The radial lip 8k has a tip that is not in contact with the outer peripheral surface 2b9 of the shaft portion 2b1 of the inner ring, and has a predetermined distance X between the tip and the outer peripheral surface 2b9. The labyrinth seal function is demonstrated. Thus, leakage of grease in the annular space 2d inside the bearing between the inner ring 2b and the outer ring 2a is prevented.

  The inner flange portion 8e can also be provided with a contact surface 8e1. The contact surface 8e1 forms a side surface on the vehicle inner side of the inner flange portion 8e that is bent from the cored tube portion 8c toward the inner ring 2b, as the contact surface 8e1. When the core 8a is press-fit into the outer ring 2a, the contact surface 8e1 is brought into contact with the receiving end surface 2a4 formed continuously with the inner peripheral surface 2a3 of the outer ring 2a into which the core metal cylinder portion 8c is press-fit. ing. The receiving end surface 2a4 of the outer ring 2a is formed through a predetermined step on the inner side of the vehicle in the axial direction Z from the one end surface 2a1 of the outer ring 2a. Further, it is advantageous to improve the positioning accuracy that the contact state between the receiving end surface 2a4 of the outer ring 2a and the contact surface 8e1 of the cored bar 8a is a metal contact. Further, when the positioning accuracy is improved, the sealing device 8 is press-fitted in an appropriate posture, and the sealing performance against foreign matters is improved.

  Further, a rust-preventing coating 8g can be formed on the externally exposed surface 8f that comes into contact with the outside air in a state in which the core metal 8a is press-fitted into the outer ring 2a. This rust preventive coating 8g is obtained by vulcanizing and bonding a rubber-like elastic member made of the same material as the axial lip 8b. As shown in FIG. 4, the externally exposed surface 8f as the vulcanization adhesion region includes a contact surface 8e1 of the cored bar 8a that contacts the receiving end surface 2a4 of the outer ring 2a, a fitting surface 8e2 of the outer ring 2a, and a chamfer. The remaining surface excluding the part facing surface 8e3 is the externally exposed surface 8f. It is also possible to make the remaining surface excluding the portion contacting the annular space chamber 2d filled with grease and the contact surface 8e1 the externally exposed surface 8f. Moreover, you may form the jetty 3d mentioned later in the outward rather than the outer flange part 8d.

  Further, as shown in FIG. 5, a chamfered portion 2a5 can be provided between the inner peripheral surface 2a3 of the outer ring 2a into which the core metal 8a is press-fitted and the one end surface 2a1 of the outer ring 2a. The chamfered portion 2a5 can be formed in a corner chamfered shape in which the corner portion is a tapered surface or a rounded chamfered shape by rounding the corner portion. Then, when the cored bar 8a is press-fitted, the rust-proofed film 8g made of a rubber-like elastic material vulcanized and bonded to the cored bar 8a is elastically deformed so that the chamfered portion 2a5 is buried, so that the rust-proofed film 8g. Can be formed and mounted on the remaining surface excluding the contact surface 8e1 of the cored bar 8a that contacts the receiving end surface 2a4 of the outer ring 2a. As a result, even if there is a foreign matter such as muddy water that is going to enter through the outer diameter side of the outer ring 2a, the chamfered portion 2a5 is filled with a rubber-like elastic member to exert a sealing function, and the intrusion can be prevented. It will be possible. Further, the chamfered portion 2a5 is a preferred form in which the rounded chamfering by rounding the corners rather than the corner chamfering that forms the tapered surface does not damage the rust preventive coating 8g made of a rubber-like elastic material because there are no burrs or sharp edges. It is.

  Moreover, the principal part of other embodiment of the rolling sealing apparatus 1 is shown in FIG. The jetty 3d can be formed to protrude from the position outside the outer diameter of the outer flange 8d of the core metal 8a to the vehicle inner side so as to cover the gap S from the side surface 3c of the hub flange 3b. The inner peripheral surface 3d1 of the jetty 3d can be formed in a tapered surface shape so that the vehicle inner side is formed with a large diameter. As described above, since the cutting process when forming the inner peripheral surface 3d1 of the jetty 3d into a tapered surface can be performed easily and quickly, for example, it is formed in a shape perpendicular to the side surface 3c (not shown). Compared with processing, it becomes a preferable form. Note that, in the embodiment according to this example, a part of the description of the same configuration as that described above will be omitted, and a related configuration unique to this example will be described.

  According to this example, since the jetty 3d as an obstacle protrudes from the hub flange 3b on the rotation side in the intrusion path of the foreign matter to be directly invaded into the gap S, the intrusion path is lengthened. And the foreign material which contacts the jetty 3d (periphery side) with the centrifugal force by rotation of the hub flange 3b can be removed, and, thereby, the amount of foreign material entering the gap S is reduced. Even if foreign matter reaches the inner peripheral surface 3d1 of the jetty 3d, the inner peripheral surface 3d1 is tapered, so that the foreign matter can be removed by the centrifugal force generated by the rotation of the hub flange 3b. The amount of infiltration is reduced.

  The principal part of other embodiment of the rolling sealing apparatus 1 is shown in FIG. In the embodiment according to this example, it passes through the outer diameter side of the outer ring 2a and enters into the press-fit fitting place between the inner peripheral surface 2a3 of the outer ring 2a and the cored bar portion 8c of the cored bar 8a in the sealing device 8. It is designed to regulate foreign matter such as muddy water. Note that, in the embodiment according to this example, a part of the description of the same configuration as that described above will be omitted, and a related configuration unique to this example will be described.

  In FIG. 7, the overall shape of the cored bar 8a is formed in an annular shape by a sheet metal material made of metal such as a steel plate. A metal core cylinder portion 8c that is press-fitted into the inner peripheral surface 2a3 of the outer ring 2a is formed. A fitting portion 8h that is bent from the vehicle outer side of the cored bar portion 8c and passes through the gap S so as to correspond to the thickness of the one end surface 2a1 of the outer ring 2a, and the inner side of the vehicle is opened to form a U-shape. Is formed. Further, an inner flange portion 8e that is bent and extended from the vehicle inner side to the inner side of the cored bar portion 8c is provided. The inner flange portion 8e is provided with a plurality of seal lips that are in sliding contact with the outer peripheral surface 2b9 of the shaft portion 2b1 of the inner ring 2b and the seal sliding surface 3c1 that is a part of the side surface 3c of the hub flange 3b. This seal lip is provided with one axial lip 8b and two radial lips 8k.

  Further, a surface modification film M can be formed by performing a surface modification treatment on the outer peripheral surface 2b9 and the seal sliding surface 3c1 as sliding surfaces that come into contact with the seal lip. Examples of the surface modification treatment include DLC (diamond-like carbon) treatment and cluster diamond treatment. The general features of these surface modification treatments can be provided with hardness, lubricity, wear resistance, chemical stability, surface smoothness, mold release, seizure resistance, and the like. The former DLC treatment is an amorphous hard film mainly composed of hydrocarbons or carbon allotropes, and is known to have almost the same meaning as a hard carbon film. Further, the latter cluster diamond treatment is known as a film obtained by forming a black diamond having a conductivity of about 15 nanometers with a surface coated with graphite carbon through various binders. These surface modification treatments can prevent rusting of the sliding surface that comes into contact with the seal lip and contribute to a reduction in the sliding resistance of the seal lip.

  Moreover, the principal part of other embodiment of the rolling sealing apparatus 1 is shown in FIG. In the embodiment according to this example, it passes through the outer diameter side of the outer ring 2a and enters into the press-fit fitting place between the inner peripheral surface 2a3 of the outer ring 2a and the cored bar portion 8c of the cored bar 8a in the sealing device 8. It is possible to regulate foreign matter such as muddy water. Note that, in the embodiment according to this example, a part of the description of the same configuration as that described above will be omitted, and a related configuration unique to this example will be described.

  In FIG. 8, the cored bar 8a is formed in an annular shape by a sheet metal material. A metal core cylinder portion 8c that is press-fitted into the inner peripheral surface 2a3 of the outer ring 2a is formed. An outer flange portion 8d is formed which is bent from the outer side of the cored bar portion 8c and extends outwardly from the outer diameter of the outer ring 2a through the gap S. A labyrinth seal portion 10 is formed by both the outer flange portion 8d and the side surface 3c of the hub flange 3b. The distance X between the outer flange portion 8d constituting the labyrinth seal portion 10 and the side surface 3c of the hub flange 3b is set to such a size that the two cooperate to exert a labyrinth seal function.

  Further, a rib protrusion 8j that protrudes toward the vehicle inner side is formed at the outer diameter end of the outer flange portion 8d. Such rib protrusions 8j make it difficult for foreign matter such as muddy water that has traveled along the outer diameter side of the outer ring 2a and reached the outer flange portion 8d to enter the gap S. Also in this example, the inner flange portion 8e described above, and a seal sliding surface which is vulcanized and bonded to the inner flange portion 8e and is a part of the outer peripheral surface 2b9 of the shaft portion 2b1 of the inner ring 2b and the side surface 3c of the hub flange 3b. A plurality of seal lips are provided in sliding contact with 3c1. This seal lip is provided with one axial lip 8b and two radial lips 8k. Further, in order to reduce the sliding resistance of the seal lip, the number of seal lips can be reduced, or the contact form can be changed to a non-contact form labyrinth seal function.

  According to this example, the rib protrusion 8j can restrict the movement of the foreign matter that travels to the outer flange portion 8d side along the outer diameter side of the outer ring 2a, so that the amount of foreign matter entering the gap S can be reduced. Become.

  Moreover, the principal part of other embodiment of the rolling sealing apparatus 1 is shown in FIG. In the embodiment according to this example, the clearance S between the one end surface 2a1 on the vehicle outer side of the outer ring 2a and the side surface 3c of the hub flange 3b is provided with a labyrinth sealing function. . Note that, in the embodiment according to this example, a part of the description of the same configuration as that described above will be omitted, and a related configuration unique to this example will be described.

  In FIG. 9, an inner flange portion 8e formed continuously from a cored bar 8a in a sealing device 8 press-fitted to the inner peripheral surface 2a3 of the outer ring 2a is formed. A labyrinth facing the one end surface 2a1 of the outer ring 2a at a position outward from the seal sliding surface 3c1, which is a part of the side surface 3c of the hub flange 3b with which the axial lip 8b vulcanized and bonded to the inner flange portion 8e contacts. It is formed as a facing surface 3c2.

  The labyrinth facing surface 3c2 is formed on the vehicle outer side with respect to the seal sliding surface 3c1 via a stepped portion 3e. And the space | interval X of the labyrinth opposing surface 3c2 formed in this way and the one end surface 2a1 of the outer ring | wheel 2a is set to the dimension in which both cooperate and exhibit a labyrinth seal function, The labyrinth seal part 10 Is configured. Further, the one end surface 2a1 of the outer ring 2a is positioned on the vehicle outer side with respect to the seal sliding surface 3c1 of the hub flange 3b with which the axial lip 8b contacts.

  According to this example, since the gap S is formed as the non-contact type labyrinth seal portion 10, the amount of foreign matter permeating from the gap S can be reduced. As a result, the sealing load on the axial lip 8b is reduced, and the sealing function of the sealing device 8 can be improved. Further, since the one end surface 2a1 of the outer ring 2a is positioned on the outer side of the vehicle with respect to the seal sliding surface 3c1 with which the axial lip 8b contacts via the step portion 3e, the step portion 3e moves toward the axial lip 8b side. Intrusion of foreign matter can be controlled.

  Further, in the hub flange 3b constituting the inner ring 2b, the radius R3 of the seal sliding surface 3c1 slidably in contact with the axial lip 8b continuous with the outer peripheral surface 2b9 of the shaft portion 2b1 slidably in contact with the radial lip 8k of the sealing device 8; In order to smoothly reduce the rounded dimension R2 of the step connecting the labyrinth facing surface 3c2 and the labyrinth facing surface 3c2 formed continuously with the seal sliding surface 3c1 and to the wall thickness on the outer diameter side of the hub flange 3b. When the R dimension R1 is formed, the dimensional relationship can be set as R1> R2> R3. As a result, it is possible to disperse the stress generated on the base portion side of the shaft portion 2b1 and the hub flange 3b (continuous portion with the shaft portion 2b1) when the inner ring 2b rotates. Further, in order to reduce the sliding resistance of the seal lip, the number of seal lips can be reduced, or the contact form can be changed to a non-contact form labyrinth seal function.

  Moreover, the principal part of other embodiment of the rolling sealing apparatus 1 is shown in FIG. In the embodiment according to this example, the non-contact type labyrinth seal portion 10 is provided in the gap S between the one end surface 2a1 side of the outer ring 2a on the vehicle outer side and the side surface 3c of the hub flange 3b. It is a form. Note that, in the embodiment according to this example, a part of the description of the same configuration as that described above will be omitted, and a related configuration unique to this example will be described.

  Specifically, the distal end surface 8b1 of the axial lip 8b is positioned on the inflow line S1 of the foreign matter that passes through the interval X portion constituting the labyrinth seal portion 10 and is directed radially inward (center side). Yes. The front end surface 8b1 is set such that the dimension X1 in the axial direction Z is larger than the interval X in a state where the axial lip 8b is in elastic contact with the side surface 3c of the hub flange 3b. This makes it easier for incoming foreign matter to be received at the front end surface 8b1 and makes it difficult to enter the side of the inner flange portion 8e formed continuously from the cored bar 8a. The influence of the elastic deformation state of 8b is reduced, a stable tension force can be maintained, and the sealing function is stabilized.

  Further, the front end surface 8b1 of the axial lip 8b is preferably formed so as to have a planar shape when in contact with the side surface 3c of the hub flange 3b. In this contact state, the front end surface 8b1 and the hub flange 3b which is the contact surface are formed. The internal angle θ intersecting with the side surface 3c is preferably set to about 45 degrees. This internal angle θ is suitable for facilitating expelling when sand, dust, etc. contained in foreign matter passing through the portion X of the labyrinth seal portion 10 are accumulated between the side surface 3c and the front end surface 8b1.

  Further, as in the example shown in FIG. 3, the radial lip 8k according to this example is not in contact with the outer peripheral surface 2b9 of the shaft portion 2b1 of the inner ring, and a predetermined gap is provided between the front end and the outer peripheral surface 2b9. X is included, and both cooperate to exert a labyrinth seal function. In the case of this example, a shaft small diameter portion 2b11 having a smaller diameter than the outer peripheral surface 2b9 is formed in the portion of the outer peripheral surface 2b9, and a step 2b12 is formed on the vehicle outer side in the axial direction Z. . This step 2b12 makes it difficult for the grease filled in the annular space chamber 2d inside the bearing to leak to the outside.

  Further, the axial lip 8b formed from the inner flange portion 8e of the cored bar 8a is formed so as to gradually increase the thickness from the base side to the tip (tip surface 8b1) side. When the heat of 8b is generated, so-called sag and stick slip that the material becomes soft can be prevented.

  The plurality of rolling bearing devices 1 described above are exemplifications, and each component constituting these rolling bearing devices 1 can be variously modified. These components (for example, the receiving end surface 2a4, the chamfered portion). 2a5, jetty 3d, axial lip 8b, radial lip 8k, rust preventive coating 8g, surface modification film M, labyrinth seal 10 etc.) may be combined to form another example of rolling bearing device 1 It is.

DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 2a Outer ring | wheel 2a1 One end surface 2a3 Inner peripheral surface 2a4 End face 2a5 Chamfer 2b Inner ring 2c Rolling element 3b Hub flange 3c Side surface 3d Jetty 3d1 Inner peripheral surface 6 Vehicle fixing member 8 Sealing device 8a Core 8c Axial lip 8b Core tube portion 8d Outer flange portion 8e Inner flange portion 8e1 Contact surface 8f External exposed surface 8g Anticorrosive coating 8j Rib ridge 10 Labyrinth seal portion

Claims (4)

An outer ring connected to a vehicle fixing member on the vehicle inner side, an inner ring having a hub flange connected to a wheel on the vehicle outer side, a rolling element interposed between the inner ring and the outer ring, and at least the vehicle outer side A rolling bearing device provided with a sealing device that seals between the inner ring and the outer ring from the outside,
One end surface of the outer ring on the vehicle outer side is disposed opposite to the side surface of the hub flange, and a predetermined gap is provided between the side surface of the hub flange and one end surface of the outer ring.
The sealing device has a metal core that is press-fitted to the inner peripheral surface of the outer ring, and the metal core has an axial lip made of a rubber-like elastic member that is slidable with respect to the hub flange. And the cored bar is bent from the vehicle outer side of the cored bar cylinder that is press-fitted into the inner peripheral surface of the outer ring, and extends outside the outer diameter of the outer ring through the gap. A rolling bearing device in which a flange portion is formed and a labyrinth seal portion is formed by the outer flange portion and a side surface of the hub flange.   A contact surface is formed on an inner flange portion that is bent from the vehicle inner side of the core metal cylinder portion of the core metal and extends to the inner ring side. When the core metal is press-fitted into the outer ring, the core metal cylinder portion is 2. The rolling bearing device according to claim 1, wherein the contact surface is brought into contact with a receiving end surface formed continuously with an inner peripheral surface of the outer ring into which the outer ring is press-fitted.   The rolling bearing device according to claim 2, wherein the contact state between the receiving end surface of the outer ring and the contact surface of the cored bar is a metal contact.   The rolling according to any one of claims 1 to 3, wherein a rust preventive film is formed on an externally exposed surface that comes into contact with outside air in a state where the core metal is press-fitted into the outer ring. Bearing device.

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