JP2016044784A - Bearing device for supporting wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for supporting a wheel capable of suppressing collapse of roundness of a raceway groove, and improved in rigidity to prevent deformation in attaching a knuckle.SOLUTION: A bearing device includes at least a rotatable hub ring 27, an outer ring 1 disposed at an outer side of the hub ring 27 while fixed to a knuckle 50, and a plurality of rolling elements 43 assembled between an outside row raceway groove 33 and an inside row raceway groove 37 of the hub ring 27, between an outside row raceway groove 9 and an inside row raceway groove 21 of the outer ring 1, and between the inner ring raceway groove and the outer ring raceway groove, and further has a knuckle flange 3 fastened to the knuckle 50, on an outer peripheral face of the outer ring 1. The inside row raceway groove 21 of the outer ring is disposed at an inner diameter side of the knuckle flange 3 in the radial direction, and an annular small-diameter portion 15 projecting to an inner diameter side in the radial direction, is disposed between the outside row raceway groove 9 and the inside row raceway groove 21 of the outer ring 1 near a groove shoulder 22 close to the outside row raceway groove 9, of the inside row raceway groove 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wheel support bearing device comprising a flange on the outer periphery of an outer ring.

As a wheel support bearing device for supporting a wheel of an automobile, for example, as shown in FIG. 4, a flange 101 for fastening with a vehicle body constituting member (for example, a knuckle of a suspension device) 200 is provided on the outer periphery of the outer ring 100. An inner ring rotating type bearing device (inner ring rotating hub bearing) is known.
The outer ring 100 includes a wheel side cylindrical portion 102 provided on the wheel side with the flange 101 as a boundary, and a vehicle body side cylindrical portion 103 provided on the vehicle body side. The outer row raceway groove 105 is annularly provided, and the inner row raceway groove 106 is annularly provided on the inner diameter of the vehicle body side cylindrical portion 103. The outer row raceway groove 105 and the inner row raceway groove 106 together with an outer row raceway groove 401 and an inner row raceway groove (inner row raceway groove provided on the outer diameter of another inner ring) 402 provided on the outer diameter of the inner ring 400, respectively. The rolling element 500 forms a double row track on which rolling is guided. In the illustrated example, the rolling element 500 is a ball, but in the case of a heavy vehicle, a tapered roller may be used as the rolling element 500.

  When such a wheel support bearing device (inner ring rotating hub bearing) is fixed to a vehicle body side member (for example, a knuckle of a suspension device) 200, for example, 3 to 4 from the vehicle body side (inboard side) of the knuckle 200. One fixing bolt 300 is inserted into each bolt hole 104 of each flange 101 and fastened.

  At this time, the fastening force at the time of fastening of the fixing bolt 300 acts on the wheel side cylindrical portion 102 and the vehicle body side cylindrical portion 103, causing deformation of the outer ring 100 after being attached to the knuckle 200.

That is, the fastening force acting on the wheel-side cylindrical portion 102 acts in a direction in which the wheel-side cylindrical portion 102 is partially pulled toward the flange 101 (in a different way, the direction in which the wheel-side cylindrical portion 102 is stretched). The outer row raceway groove 105 generates an elliptical shape whose elliptical shape has a long diameter in the vertical direction, and the fastening force acting on the vehicle body side cylindrical portion 103 pushes the vehicle body side cylindrical portion 103 partially from the flange 101. Since it acts in the direction of separating (in other words, the direction in which the vehicle body side cylindrical portion 103 is crushed), the inner row raceway groove 106 has been deformed in an elliptical shape with a long horizontal axis.
Such an inconvenience tends to cause deterioration of the roundness of the outer row raceway groove 105 far from the flange 101.
Further, such deformation is increased by a bearing having a large degree of uneven distribution of the bolt holes 104 of the flange 101.

  In view of this, the wheel support bearing device disclosed in Patent Document 1 has an inter-row inner diameter dimension between the outer row raceway groove 105 and the inner row raceway groove 106 to the ball groove shoulder. Set to be smaller than the inner diameter dimension between rows to secure the groove shoulder height necessary to prevent riding (ie, the entire width of the space between rows is thickened), and the rigidity of the cylindrical part of the outer ring By improving the knuckle, the knuckle mounting deformation is prevented.

JP 2014-109324 A

  However, in such a method shown in Patent Document 1, as described above, because the entire width of the inter-column space is thickened (to be formed thick), the cylinder of the outer ring is not sufficient for the increase in mass. The rigidity of the shape part was not so high.

  The present invention has been made in view of such problems of the prior art, and the problem is that the circularity of the raceway groove is prevented and the rigidity of the raceway is increased to prevent the knuckle from being deformed. It is to provide a bearing device for supporting a wheel to prevent.

In order to achieve this object, the first aspect of the present invention includes a rotatable inner ring, an outer ring fixedly disposed on the vehicle body side outside the inner ring, and an outer row formed on the outer diameter side of the inner ring. A double row inner ring raceway groove comprising a raceway groove and an inner row raceway groove; an outer row raceway groove formed on the inner diameter side of the outer ring; a double row outer ring raceway groove comprising an inner row raceway groove; and the inner ring raceway groove; A bearing device including at least a plurality of rolling elements incorporated between outer ring raceway grooves and a flange fastened to a vehicle body side member on an outer peripheral surface of the outer ring,
The inner row raceway grooves of the outer ring raceway grooves are provided on the inner diameter side of the flange in the radial direction,
Between the outer row raceway groove and the inner row raceway groove of the outer ring, an annular small-diameter portion projecting radially inward is provided near the groove shoulder near the outer row raceway groove in the inner row raceway groove. This is a wheel support bearing device characterized by

According to the present invention, the inner row raceway groove of the outer ring is provided at a position overlapping the inner diameter side of the flange in the radial direction. The roundness collapse is unlikely to occur.
Further, between the outer row raceway groove and the inner row raceway groove of the outer ring constituting the present invention, an annular shape projecting toward the radially inner diameter side near the shoulder of the inner row raceway groove near the outer row raceway groove. A small-diameter portion is provided, and the annular small-diameter portion is provided up to a position where a maximum moment load assumed at the time of traveling is applied and there is a gap that does not contact the inner ring even if a relative inclination occurs in the outer inner ring. As a result, it is much thicker in the radial direction compared to the prior art (Patent Document 1). Furthermore, since the annular small-diameter portion is thickened and thickened, the rigidity is increased while the mass increase is small, and the knuckle mounting deformation of the flange is reduced and the propagation of the deformation to the outer row raceway surface is prevented. Accordingly, the roundness of the outer ring raceway groove is improved.

  A second aspect of the present invention is the wheel support bearing device according to the first aspect, wherein the annular small-diameter portion is formed by setting a small opening diameter in the outer ring forging step. .

  According to the second aspect of the present invention, the cutting diameter (punching diameter) in the cutting process in the forging process of the outer ring (the process of punching and removing the partition wall portion existing on the inner diameter of the intermediate material before forming the outer ring). Therefore, the weight of the forging material does not change as compared with the prior art (Patent Document 1), and the cost does not increase. In addition, since the metal material portion having a high cleanliness of the material is exposed in the raceway groove in the same manner as a normal outer ring (hub bearing outer ring), the service life is not reduced.

  ADVANTAGE OF THE INVENTION According to this invention, while preventing the roundness collapse of a raceway groove | channel, the wheel support bearing apparatus which prevents the attachment deformation | transformation of a knuckle can be provided.

It is a vertical front view which shows one Embodiment of the bearing apparatus for wheel support of this invention. It is a schematic sectional drawing which abbreviate | omits and shows a part of outer ring of the bearing apparatus shown in FIG. It is the schematic which shows the opening process of the forge process of the outer ring | wheel which comprises this invention wheel support bearing apparatus. It is a schematic vertical front view which shows an example of a prior art.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
The present embodiment is an embodiment of the present invention, and is not construed as being limited thereto. The design can be changed within the scope of the present invention.

  In the present embodiment, an inner ring rotation type wheel support bearing device (inner ring rotation hub bearing) shown in FIG. 1 is assumed. In the present embodiment, a driven wheel hub bearing is assumed, but the technology of the present application is also applicable to a drive wheel hub bearing.

For example, an outer ring (stationary raceway ring) 1 is fixed to a vehicle body side member (for example, a knuckle 50 of a suspension device in the present embodiment) via a bolt 51, and is connected to a wheel side on an inner diameter side of the outer ring 1. A hub ring (rotation-side raceway ring) 27 that is rotatably supported is provided.
And, the double-row raceway grooves 9 and 21 provided on the inner diameter of the outer ring 1 and the double-row raceway grooves 33 and 37 provided on the outer diameter of the hub ring 27 are provided in a double row, A rolling element 43 that is held so as to be able to roll by a cage 41 is incorporated in a double row track.
In the present embodiment, a sealing device (outer seal) 45 that seals the axially outer opening region between the outer ring 1 and the hub wheel 27 is attached, and a metal cap 47 that seals the axially inner opening region. Is attached to seal the inside of the bearing (see FIG. 1). The outer seal 45 and the metal cap 47 are not particularly limited to the illustrated form, and can be modified within the scope of the present invention.

  The outer ring 1 has a substantially cylindrical shape having an inner diameter larger than the outer diameter of the hub wheel 27 described later, and is a flange (knuckle flange) fixed to the outer diameter via the knuckle 50 and the bolt 51. 3 projecting outward in the radial direction (radial direction) H, and the wheel side cylindrical portion 5 provided on the axially outer side with the flange (knuckle flange) 3 as a boundary, and the vehicle body provided on the axially inner side It has the side cylindrical part 23 (refer FIG. 2).

The wheel-side cylindrical portion 5 has an axially outer end 7 that has the largest inner diameter, an inner diameter that is continuous from the end 7 toward the inner side in the axial direction, and has a smaller inner diameter than the end 7. An outer row raceway groove 9 that is annularly recessed, and an annular small diameter portion 15 that is continuous from the outer row raceway groove 9 inward in the axial direction and has an inner diameter smaller than that of the outer row raceway groove 9. (See FIG. 2).
The inside of the end portion 7 is configured as an arrangement region of the sealing device (seal member) 45 (see FIG. 1).

The annular small-diameter portion 15 is provided between the outer row raceway groove 9 and an inner row raceway groove 21 described later (between rows), and gradually decreases from the groove shoulder 11 of the outer row raceway groove 9 toward the inner side in the axial direction. It is formed with a gentle inclined surface portion 13 having a small diameter, and is continuously projected near the groove shoulder 22 near the outer row raceway groove 9 in the inner row raceway groove 21.
That is, both sides of the annular small-diameter portion 15 are forged surfaces and have draft angles, so that the inclined surface portion 13 has a larger diameter as the distance from the annular small-diameter portion 15 increases (see FIG. 2).
Since the configuration as described above is adopted, the inclined surface portion 13 continuing from the groove shoulder 22 of the inner row raceway groove 21 is compared with the inclined surface portion 13 continuing from the groove shoulder 11 of the outer row raceway groove 9. And extremely short.
A predetermined axially flat surface 17 is provided at the tip of the annular small diameter portion 15 (see FIG. 2).

In the present embodiment, an annular small-diameter portion 15 that protrudes toward the inner diameter side in the radial direction H is provided in the vicinity of the outer row raceway groove 21 in the inner row raceway groove 21 in the inner row raceway groove 21, The maximum moment load assumed during traveling is applied, and even if a relative inclination occurs in the outer and inner rings, a gap that does not come into contact with the hub wheel 27 is provided (see FIGS. 1 and 2). .
Thereby, the space between rows (between double-row raceway grooves) is much thicker in the radial direction than in the prior art (Patent Document 1). Further, since the thickness is thickened only on the annular small diameter portion 15, the rigidity is increased for a small increase in mass, and the knuckle mounting deformation of the flange (knuckle flange) 3 is reduced, and the outer row raceway grooves 9 are reduced. Prevent the propagation of deformation. Accordingly, the roundness of the outer ring raceway groove is improved.

The flange (knuckle flange) 3 is configured to protrude outward in the radial direction at a plurality of locations (for example, 3 to 4 locations) at the outer diameter of the outer ring 1, and has bolt holes 19 penetrating in the axial direction. I have. The flange (knuckle flange) 3 can adopt a known general form and is not limited to the illustrated form.
The outer ring 1 on which the flange (knuckle flange) 3 is projected is larger in diameter than the annular small diameter portion 15 and overlaps the flange (knuckle flange) 3 in the radial direction. An inner row raceway groove 21 that is one raceway groove is recessed in an annular shape.

  That is, the inner row raceway groove 21 is not provided in the inner diameter of the vehicle body side cylindrical portion 23 but overlaps the flange (knuckle flange) 3 on the inner diameter side in the radial direction of the flange (knuckle flange) 3. Therefore, even if the knuckle 50 is deformed, the inner surface raceway groove 21 is unlikely to be broken in the roundness of the raceway surface.

  The vehicle body side cylindrical portion 23 has an inner diameter surface that is continuous from the inner row raceway groove 21 provided on the inner diameter side of the flange (knuckle flange) 3 toward the inner side in the axial direction. 47 is fitted and attached. In the present embodiment, the end portion 25 is configured to protrude in the axial direction from an end portion (caulking end portion) 28 of the hub wheel 27 described later (see FIG. 1).

  The hub wheel 27 is provided with a pilot surface 29 outside the outer peripheral surface, and a hub flange 31 that protrudes outward in the radial direction (radial direction) H on the inner side (bearing inward) than the pilot surface 29. Provided.

  Further, a first inner ring raceway groove (outer row raceway groove) 33 continuous in the circumferential direction is formed on the outer peripheral surface of the hub wheel 27 on the opposite pilot surface 29 side across the pilot surface 29 and the hub flange 31. The first inner ring raceway groove (outer row raceway groove) 33 is continuous from the position of the first inner ring raceway groove (outer row raceway groove) 33 and is one step lower than the first inner ring raceway groove (outer row raceway groove) 33 (first inner ring raceway groove). The inner ring fitting surface 35 is continuously formed in the circumferential direction at an outer peripheral position having a smaller diameter than the outer diameter of 33, and a second inner ring raceway groove (inner side) continuous in the circumferential direction is formed on the inner ring fitting surface 35. A separate inner ring constituent member (separate inner ring) 39 having a column raceway groove 37 is fitted and the end portion 28 is fixed by caulking.

  Therefore, the outer row raceway groove 9 on the outer ring 1 side and the first inner ring raceway groove (outer row raceway groove) 33 on the hub wheel 27 side face each other to form one raceway groove, and the inner side on the outer ring 1 side The row raceway groove 21 and the second inner ring raceway (inner row raceway groove) 37 of the inner ring constituting member (separate inner ring) 39 face each other to constitute the other raceway groove.

  As described above, the flanged outer ring 1 used in the hub bearing of the present embodiment has the inner row raceway groove 21 overlapped with the flange (knuckle flange) 3 on the inner diameter side of the flange (knuckle flange) 3. In addition to the new configuration provided, a new configuration is provided in which an annular small-diameter portion 15 projecting inward in the radial direction is provided in the vicinity of the inner row groove shoulder 22 of the inner diameter between the rows of the outer row raceway grooves 9 and the inner row raceway grooves 21. ing.

In this embodiment, since such a structure is employed, the inner row raceway grooves arranged on the inner diameter side of the knuckle flange are less likely to cause the roundness of the raceway surface to be deformed even if the knuckle is deformed.
In addition, the annular small diameter portion 15 is much thicker in the radial direction than the prior art (Patent Document 1), and only the annular small diameter portion 15 is thickened. Flange 3) knuckle mounting deformation itself is reduced and the propagation of deformation to the outer row raceway groove 9 is prevented, so that both the raceway surfaces of both rows can solve the problems of bearing life reduction and noise due to collapse of roundness. .

  The flanged outer ring 1 used for the hub bearing of the present application is arranged so that the groove bottom portion of the inner row raceway groove 21 is overlapped with the flange (knuckle flange) 3 in the radial direction H, and the inner side on the inner diameter side of the flange (knuckle flange) 3. Since the row raceway grooves 21 are arranged, even if the vicinity of the position of the bolt hole 19 of the flange (knuckle flange) 3 is deformed, the inner row raceway groove 21 is unlikely to be broken.

  FIG. 3 shows a cut-off process in the forging process of the outer ring 1 constituting the wheel support bearing device of the present embodiment (a process of punching and removing the partition wall portion existing in the inner diameter of the intermediate material before forming the outer ring). FIG. 2 is a schematic view showing a state of being cut (punched) in FIG. 1, and the outer ring 1 of the present embodiment is manufactured by the same process as that of the prior art (Patent Document 1). It should be noted that the forging process of the outer ring 1 is different only in the cutting process as described above, and the description of the other processes is omitted because other well-known processes can be adopted.

The said annular small diameter part 15 is shape | molded by making a diameter small in this outline process.
That is, the diameter of punching (punching diameter) is reduced, and the weight of the forging material does not change as compared with the conventional technique (Patent Document 1), so that the cost is not increased and the cutting amount is small, so that the conventional technique ( The yield is improved as compared with Patent Document 1).
In addition, a metal material portion (shaded portion indicated by reference numeral 49 in FIG. 3) with a high degree of cleanness of the material is exposed in the raceway groove in the same manner as a normal outer ring (hub bearing outer ring) 1, so that the life is reduced. Nor.

  The present invention can be used, for example, even when a roller is used as a rolling element, and can be used as a driven wheel or a drive wheel, and is appropriately designed within the scope of the present invention. It can be changed.

1 Outer ring 3 Flange (knuckle flange)
9 outer row raceway groove 15 annular small-diameter portion 21 inner row raceway groove 27 hub wheel 43 rolling element 50 vehicle body side member (knuckle)

Claims (2)

A double-row inner ring raceway groove comprising a rotatable inner ring, an outer ring fixed to the vehicle body outside the inner ring, an outer row raceway groove and an inner row raceway groove formed on the outer diameter side of the inner ring A plurality of rolling elements incorporated between the inner ring raceway groove and the outer ring raceway groove, and a double row outer ring raceway groove formed of an outer row raceway groove and an inner row raceway groove formed on the inner diameter side of the outer ring. A bearing device including at least a flange fastened to a vehicle body side member on an outer peripheral surface of the outer ring,
The inner row raceway grooves of the outer ring raceway grooves are provided on the inner diameter side of the flange in the radial direction,
Between the outer row raceway groove and the inner row raceway groove of the outer ring, an annular small-diameter portion projecting radially inward is provided near the groove shoulder near the outer row raceway groove in the inner row raceway groove. A wheel support bearing device. 2. The wheel support bearing device according to claim 1, wherein the annular small diameter portion is formed by setting a small diameter in an outer ring forging step. 3.

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