JP2010137629A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device preventing a deterioration in a sealing function of a sealing device by reducing an amount of entry of water itself reaching the sealing device without improving the sealing device. <P>SOLUTION: This rolling bearing device includes an attachment flange 23 of a vehicle inner side vehicle fixing member 21, an outer ring 2, a hub flange 10 on a vehicle outer side, an inner ring 3, a rolling element 4 rotatably housed between both rolling grooves, and a labyrinth clearance S arranged between one end surface 19 of the outer ring 2 and the side surface 20 of the hub flange 10. The outer peripheral surface 25 of the outer ring 2 is formed continuously to the base part of the attachment flange 23 in the Z-axis direction up to one end surface 19 with the Z-axis as the axial center of the outer ring 2 in a manner with the outer ring 2 fixed to the vehicle fixing member 21, and the upper peripheral surface is configured to expand to both sides from a top part in the radial direction of the outer ring 2, and form an inclined surface inclined in the inner side of a reference arc with a distance from the axial center of the outer ring 2 to the top part as a radius. <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 on the vehicle body side, an inner ring that is disposed concentrically with the outer ring and includes a hub flange for mounting a tire wheel or a brake disk, and is interposed between the outer ring and the inner ring. A rolling element. 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, it is known to arrange a sealing device between the inner and outer rings on the hub flange side (see Patent Document 1).

JP 2008-64296 A

The seal device of the rolling bearing device as in Patent Document 1 includes a core bar press-fitted into the inner peripheral surface of the 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 the hub flange. Yes. However, there is a labyrinth gap that opens directly to the outside between the side surface on the axial direction side of the hub flange of the inner ring and the end surface on the axial direction side of the outer ring.
In recent years, ventilation holes and gaps for introducing outside air have been provided for cooling brake disks. As a result, the amount of water as foreign matter that reaches the labyrinth gap also tends to inevitably increase through such a vent hole, and a sufficient sealing function cannot be exhibited for this increased amount of penetration. There is a fear.

  The present invention has been made in order to solve the above-described problems, and reduces the amount of water permeating itself reaching the sealing device without improving the sealing device, thereby preventing the sealing function of the sealing device from being deteriorated. An object of the present invention is to provide a rolling bearing device.

Means for Solving the Problems and Effects of the Invention

  In order to solve the above problems, a rolling bearing device according to the present invention includes an outer ring having a mounting flange for mounting on a vehicle fixing member on the inner side of the vehicle, an outer ring having an outer ring rolling groove formed on the inner periphery, and a vehicle outer side. An inner ring having a hub flange connected to the brake disk and the wheel, an inner ring rolling groove opposed to the outer ring rolling groove formed on the outer periphery, and an inner ring concentric with the axis of the outer ring, and both rolling grooves A rolling bearing device comprising: a rolling element housed in a freely rotatable manner; and a labyrinth gap provided between one end face of the outer ring and a side face of the hub flange, wherein the outer ring is the vehicle fixing member. The axis of the outer ring is a Z axis, an X axis orthogonal to the Z axis, and a Y axis orthogonal to both the X axis and the Z axis are defined, and the Z axis direction At the base side of the mounting flange An outer peripheral surface of the outer ring formed up to one end surface, wherein an upper outer peripheral surface above the Y axis is in the radial direction of the outer ring between the Y axis and the X axis. An inclined surface that extends from the top at the upper side to both sides of the X axis and is inclined inwardly toward the lower side of the Y axis inside the reference arc having a radius from the axis of the outer ring to the top. It is characterized by being formed.

  By adopting the above-described configuration, even when water as foreign matter such as sand or snow melt containing muddy water reaches the outer peripheral surface of the outer ring from the outside, the upper outer peripheral surface can be formed with a steeper slope than the gradient of the reference arc. Thus, water can be actively allowed to flow downward, so that the amount of water permeating into the labyrinth gap itself can be reduced, and as a result, a reduction in the sealing function of the sealing device having the labyrinth gap can be prevented.

  In order to solve the above-mentioned problem, in the rolling bearing device of the present invention, the upper outer peripheral surface has a minimum thickness that maintains at least a predetermined strength of the outer ring with the outer ring rolling groove in the radial direction. It is characterized by being formed to have a portion that passes through the outer peripheral portion that satisfies the requirements, so that the amount of water that reaches the labyrinth gap itself can be reduced without impairing the strength of the outer ring, and the outer shape of the outer ring is Since it can be formed by a normal forging process and no other other processing method is required, an increase in manufacturing cost can be suppressed. In addition, since the inner angle of the top of the inclined surface is 120 degrees or less, it is possible to set the slope to be steeper than the gradient of the outer peripheral surface as a basic form of a circular cross section. Becomes easier to flow downward. In addition, since the inclined surface of the upper outer peripheral surface is formed in a flat surface shape from the top to both sides of the X axis, the inclination gradient is constant and is a flat surface. Before reaching the labyrinth gap, water can be efficiently flowed downward.

  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 2 as a fixed ring made of a bearing steel material, an inner ring 3 concentric with the axis of the outer ring 2 as a rotating ring, and an inner ring 3 and an outer ring 2. A rolling bearing 5 composed of rolling elements 4 arranged in a plurality of intervening rows is provided.

  The inner ring 3 is integrally formed with the hub 6. The hub 6 is provided with a disc-shaped hub flange 10 that is fixed to a hub bolt 9 to be mounted so as to be connected to a brake disk 7 and a tire wheel 8 as a wheel on the outer side of the vehicle. . The hub flange 10 is integrally formed on the outer periphery of one end portion (vehicle outer side) of the shaft portion 11 constituting the inner ring 3.

  A small-diameter portion 12 whose outer diameter is one step smaller is formed at the other end portion (vehicle inner side) of the shaft portion 11. An inner ring divided body 14 having an inner ring rolling groove 13 on which one rolling element 4 whose outer peripheral surface is arranged in a plurality of rows rolls is press-fitted and fixed to the small diameter portion 12. Further, an inner ring rolling groove 15 on which the other rolling elements 4 arranged in a plurality of rows roll is formed on the outer peripheral surface between the one end and the other end of the shaft portion 11. Thus, the inner ring | wheel division | segmentation 3 provided with the hub flange 10 in the one end part is comprised by the inner ring | wheel division body 14 being press-fitted and integrated in the other end part of the axial part 11. FIG.

  The outer ring 2 includes an outer ring body 16 formed in a substantially cylindrical shape, and a rolling element 4 facing the inner ring rolling grooves 13 and 15 of the inner ring 3 rolls on the inner peripheral surface 17 of the outer ring body 16. A moving outer ring rolling groove 18 is formed. One end surface 19 of the outer ring body 16 on the vehicle outer side is disposed to face the side surface 20 of the hub flange 10, and a predetermined labyrinth gap is provided between the side surface 20 of the hub flange 10 and the one end surface 19 of the outer ring 2. S is provided.

  Returning to FIG. 1, the outer ring 2 is connected to an attachment port 22 of a vehicle fixing member 21 such as a knuckle or an axle housing on the vehicle inner side of a suspension device in the vehicle. In this connection, the outer ring 2 is inserted into the mounting port 22 and fitted, and a mounting flange 23 having a predetermined thickness protruding outward from the other end side of the outer ring body 16 is connected to a fastening member such as a bolt or a nut. 24 is fixed to the peripheral surface (vehicle outer side) of the mounting port 22 of the vehicle fixing member 21. In this manner, in which the rolling bearing device 1 is fixed to the vehicle fixing member 21, the axis of the outer ring 2 is the Z axis, the X axis (corresponding to a substantially horizontal direction) orthogonal to the Z axis, A Y-axis (substantially equivalent to a vertical direction) perpendicular to both the Z-axis is defined.

  Further, as shown in FIG. 2, the attachment flange 23 is provided with at least three insertion holes 23 </ b> A through which the fastening members 24 for attachment to the vehicle fixing member 21 are inserted in the thickness direction. The external shape of the mounting flange 23 is formed in a substantially triangular shape so that the bottom side is the lower side of the Y axis when viewed from the Z-axis direction. Further, on the peripheral surface 23B of the mounting flange 23, a drainage groove 23C for flowing water as foreign matter such as sand and muddy water containing snow melting agent that reaches and adheres to the peripheral surface 23B from the outside directly. Is formed. With this drainage groove 23C, the amount of water permeating into the labyrinth gap S itself can be reduced.

  Moreover, the basic form of the outer peripheral surface 25 of the outer ring | wheel trunk | drum 16 formed from the base part side of the mounting flange 23 of the outer ring | wheel 2 to the one end surface 19 is arbitrary places in an axial direction (Z-axis). The cross-sectional shape is circular. And the sand and snow melting agent which arrives and adheres from the outside through the ventilation hole (not shown) etc. which are formed in order that the outer ring 2 is fixed to the vehicle fixing member 21 to cool the brake disk 7 In order to reduce the amount of water as foreign matter such as muddy water containing water and to reduce the amount of intrusion into the labyrinth gap S itself, the outer peripheral surface 25 is formed in an irregular shape. The outer ring body portion 16 is not limited to a cylindrical shape, and can be formed in a tapered cylindrical shape so that one end surface 19 side thereof has an enlarged or reduced diameter shape, for example, as shown in FIGS.

  As a form of the outer peripheral surface 25, as shown in FIG. 5, the upper outer peripheral surface 25A side above the Y axis is formed in a different shape. That is, in the radial direction R of the outer ring 2 between the Y axis and the X axis, it extends from the top 25B above the Y axis to both sides of the X axis and extends from the axis (Z axis) of the outer ring 2 to the top 25B. It is formed so as to form an inclined surface that is inclined inwardly of the reference arc BR with a radius of 向 か っ て and downward toward the Y axis.

  25 A of this upper outer peripheral surface passes through the outer peripheral location which satisfy | fills the minimum thickness T which maintains the mechanical predetermined intensity | strength of the outer ring | wheel 2 between the groove bottoms of the outer ring | wheel rolling groove 18 in radial direction R. Is formed. The inclined surface of the upper outer peripheral surface 25A is formed as a flat surface from the top 25B toward both sides of the X axis, and the lower end thereof is the end of the semicircular lower outer peripheral surface 25C below the Y axis. The inner angle θ of the top portion 25B of the inclined surface is desirably 120 degrees or less. Thus, by setting the inner angle θ of the apex 25B to 120 degrees or less, it is possible to set the slope as a steep slope rather than the gradient of the outer peripheral surface 25 as a basic form having a circular cross section.

  Further, as a modification of the flat outer peripheral upper surface 25A, as shown in FIG. 6, the lower end of the upper outer peripheral surface 25A is based on the top 25B inside the reference arc BR. It is also possible to adopt a form connected to an arbitrary position of the arc BR. Further, instead of the flat outer peripheral surface 25A, as shown in FIG. 7, for example, a curved surface shape (so-called egg shape or tear shape) in which the radius of curvature is changed at an arbitrary position such as a part of an ellipse. It is also possible to form the upper outer peripheral surface 25A.

  Further, as shown in FIG. 8 as a modified example of the upper outer peripheral surface 25A, the outer peripheral surface 25 which is continuous from the base side of the mounting flange 23 of the outer ring 2 and extends to the one end surface 19 is formed in a circular cross section, A rib 25D having a circular arc surface RS is provided above the Y axis on the upper outer peripheral surface 25A of the surface 25.

  When the rib 25D is provided, the inclined surface defines a reference arc BR having a radius from the axial center of the outer ring 2 to the apex 25B, and the reference arc BR connects the intersection where the X axis intersects the apex 25B. It is replaced with the surface including the connecting line L1. Then, the area of the portion surrounded by the arc surface RS of the connection line L1 and the rib 25D is S1, the area of the portion surrounded by the connection line L1 and the upper outer peripheral surface 25A is S2, and the arc surface of the connection line L1 and the rib 25D. When the area surrounded by the RS and the upper outer peripheral surface 25A is S3 and the area surrounded by the connection line L1, the upper outer peripheral surface 25A and the X axis is S4, “S1 + S2” and “S3 + S4” are the same. By satisfying the conditions to be satisfied, the surface including the connecting line L1 to be replaced is an inclined surface.

  Thus, by both the outer peripheral surface 25 including the upper outer peripheral surface 25A formed in a different shape and the mounting flange 23 including the drainage groove 23C, the effect of reducing the amount of water permeating into the labyrinth gap S side as foreign matter itself is reduced. Can be further enhanced.

  Returning to FIG. 1, the rolling bearing 2 is provided with sealing devices 31 and 32 for sealing the annular space chamber 30 between the outer ring 2 and the inner ring 3 from the outside. The sealing devices 31 and 32 are provided on both ends of the rolling bearing 2 in the Z-axis direction. Further, grease is sealed in the annular space chamber 30 inside the bearing between the inner ring 3 and the outer ring 2.

  Further, as shown in FIG. 9, the sealing device 31 provided at least on the outer side of the vehicle has a core bar 33 that is press-fitted to the inner peripheral surface 17 of the outer ring 2. The core metal 33 is formed into an annular shape as a whole by a metal plate made of metal such as a steel plate. A cylindrical cored bar portion 34 that is press-fitted and fitted to the inner peripheral surface 17 of the outer ring 2 is formed. A cored bar part 35 is formed which is bent inward in the radial direction R from the vehicle outer side of the cored bar part 34 and extends to the inner ring 3 side.

  A seal member 36 made of a rubber-like elastic member is vulcanized and bonded to the metal core 33. The seal member 36 has an axial lip 37 and a radial lip 38. The axial lip 37 has a distal end extending obliquely outward in the Z-axis direction and directed toward the hub flange 10 side. Thus, by bringing the tip end side of the axial lip 37 into contact with the side surface 20 of the hub flange 10, a sealing function that prevents water from entering the annular space chamber 30 from the labyrinth gap S is exhibited. Further, the radial lip 38 has a distal end extending downward in the radial direction R and directed toward the shaft 11 side. By this, the sealing function which prevents the leakage of grease to the outside is exhibited by bringing the distal end side of the radial lip 38 into contact with the outer peripheral surface of the shaft portion 11.

  Returning to FIG. 1, the shaft portion 11 of the inner ring 3 is formed with a connection insertion hole 41 to which a drive shaft 40 as a drive shaft for transmitting power is spline-coupled. The drive shaft 40 is passed through the connecting insertion hole 41 so that power can be transmitted. Then, the shaft end surface 42 of the drive shaft 40 is brought into contact with the inner ring end surface 43 on the vehicle inner side of the inner ring divided body 14 facing the shaft end surface 42 so that the end of the drive shaft 40 on the extending side is It is fixed by screwing a nut 44 as a screw fastening means.

  Further, although this example is the rolling bearing device 1 on the drive wheel side, in the case where the connecting insertion hole 41 is not formed in the shaft portion 11, the other end side of the shaft portion 11 is connected to the outside as shown in FIG. Rolling bearing device for a driven wheel, which is fixed so that it does not come off in the Z-axis direction by a caulking portion 45 formed by plastic deformation outward in the radial direction R so that the other end side is caulked. It can also be 1.

Sectional drawing which shows the attachment state of the rolling bearing apparatus of this invention. The figure which looked at the rolling bearing apparatus from the Z-axis direction. The figure which shows the other external form of an outer ring | wheel. The figure which shows the other external form of an outer ring | wheel. The figure which shows the form of the outer peripheral surface of an outer ring | wheel. The figure which shows the other form of the outer peripheral surface of an outer ring | wheel. The figure which shows the other form of the outer peripheral surface of an outer ring | wheel. The figure which shows the other form of the outer peripheral surface of an outer ring | wheel. The elements on larger scale which show a sealing device. The elements on larger scale which show the other form of a rolling bearing apparatus.

Explanation of symbols

2 Outer ring 3 Inner ring 4 Rolling element 7 Brake disk 10 Hub flange 19 One end face 21 Vehicle fixing member 23 Mounting flange 25 Outer peripheral face 25B Top

Claims (4)

An outer ring having a mounting flange for mounting to a vehicle fixing member on the inner side of the vehicle, and an outer ring rolling groove formed on the inner periphery;
A brake disk on the vehicle outer side and a hub flange connected to the wheel, an inner ring rolling groove facing the outer ring rolling groove is formed on the outer periphery, and an inner ring concentric with the axis of the outer ring;
A rolling element housed between the rolling grooves so as to freely roll,
A labyrinth gap provided between one end surface of the outer ring and a side surface of the hub flange, and a rolling bearing device comprising:
In a mode in which the outer ring is fixed to the vehicle fixing member, the axial center of the outer ring is a Z axis, an X axis orthogonal to the Z axis, and a Y axis orthogonal to both the X axis and the Z axis And
The outer peripheral surface of the outer ring formed between the base end side of the mounting flange in the Z-axis direction and up to the one end surface, and the upper outer peripheral surface above the Y-axis is above the Y-axis and the Inward of a reference arc that extends from the top above the Y axis to both sides of the X axis and has a radius from the axis of the outer ring to the top in the radial direction of the outer ring with respect to the X axis Thus, the rolling bearing device is formed so as to form an inclined surface which is inclined toward the lower side of the Y-axis.   The upper outer peripheral surface is formed so as to have a portion passing through an outer peripheral portion that satisfies at least a minimum thickness for maintaining a predetermined strength of the outer ring with the outer ring rolling groove in the radial direction. The rolling bearing device according to claim 1.   The rolling bearing device according to claim 2, wherein an inner angle of the top of the inclined surface is 120 degrees or less.   The rolling bearing device according to claim 3, wherein the inclined surface of the upper outer peripheral surface is formed in a flat surface shape from the top to both sides of the X axis.

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