JP4009813B2 - Axle bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an axle bearing device to which wheels are attached.
[0002]
[Prior art]
A basic configuration of this type of conventional axle bearing device will be described with reference to FIGS. FIG. 8 is a longitudinal sectional view of the axle bearing device, and FIG. 9 is a sectional view taken along line (9)-(9) in FIG. Here, an axle bearing device used on the drive wheel side is given as an example.
[0003]
In the figure, 1 is an axle bearing device, 2 is a hub wheel, 3 is a double row outward angular ball bearing, 4 is a drive shaft, 5 is a disc rotor of a disc brake device, 6 is a knuckle, and 7 is a brake of the disc brake device. It is a pad.
[0004]
The disk rotor 5 is attached in a state where it is applied so as to be in close contact with the outer end surface of the flange 10 of the hub wheel 2. The disk rotor 5 is fixed by bolts 12 that are inserted in a non-separated manner in a through state into bolt mounting through holes 11 provided at several circumferential positions of the flange 10.
[0005]
In the first place, since the disk rotor 5 is mounted after the axle bearing device 1 is mounted on the drive shaft 4, the bolt 12 is not mounted in advance on the bolt mounting through hole 11 of the flange 10. In addition, at the stage of handling the single axle bearing device 1, it is difficult to drop the bolt 12 described above, so the bolt 12 is attached to the through hole 11 for bolt attachment in a non-separable manner.
[0006]
Conventionally, in order to make the bolt 12 described above unseparated from the bolt mounting through-hole 11, the serration 13 is formed only in the head side region in the screw shaft portion of the bolt 12. 13 is inserted and mounted so as to bite into the circular inner peripheral surface of the bolt mounting through-hole 11.
[0007]
[Problems to be solved by the invention]
By the way, if the adhesion of the disk rotor 5 to the outer end surface of the flange 10 is low, the disk rotor 5 tends to run out due to the rotation of the hub wheel 2, and the contact state of the brake pad 7 with respect to the disk rotor 5 is lowered, which is inconvenient. It is.
[0008]
In order to suppress such surface runout as small as possible, it is required to increase the flatness accuracy of the entire outer end surface of the flange 10 to further improve the adhesion of the disc rotor 5 to the flange 10.
[0009]
The flatness of the outer end face of the flange 10 in the conventional axle bearing device 1 will be described with reference to FIG. FIG. 10 is an enlarged cross-sectional view of the periphery of the bolt 10 through-hole 11 for mounting the flange 10.
[0010]
In the conventional axle bearing device 1, the serrations 13 of the bolts 12 are bitten into the bolt mounting through holes 11 in order to mount the bolts 12 in a non-separable manner with respect to the bolt mounting through holes 11. ing. Therefore, the flesh portion around the bolt mounting through-hole 11 slightly flows in the direction of the arrow due to plastic deformation. Then, depending on the biting state of the serration 13 with respect to the bolt mounting through hole 11, the excess meat portion flows toward the outer end surface of the flange 10.
[0011]
In this case, the flesh that flows outward in the radial direction of the flange 10 from the bolt mounting through hole 11 is absorbed by the outer edge of the flange 10, but flows in the circumferential direction of the bolt mounting through hole 11. As for the flesh portion, there is no portion that absorbs the flesh portion in the region between the circumferential directions of the bolt mounting through-holes 11, so that the flesh portion stops in that region, thereby the outer end surface of the flange 10. A convex deformation occurs in the direction.
[0012]
In such a flange 10, the flatness of the outer end surface is lowered, and therefore the disc rotor 5 is not preferable because the adhesion to the outer end surface is lowered.
[0013]
Therefore, an object of the present invention is to stabilize the mounting posture of the disc rotor with respect to the flange outer end surface of the hub wheel in the axle bearing device.
[0014]
[Means for Solving the Problems]
Axle bearing apparatus of the present invention, there is provided a bearing apparatus for an axle mounted by bolts in a state in which the disc rotor is an assigned disk brake device on the outer end surface of the radially outward flange Ha Buhoiru, said bolt Serrations are formed on the head side of the screw shaft portion, and bolt mounting through holes are provided at a plurality of locations in the circumferential direction of the flange. The bolts are connected to the inner peripheral surface of the bolt mounting through holes. A recess in the thickness direction is provided in a region on the outer end surface between the bolt mounting through holes adjacent to each other in the circumferential direction of the flange, and is recessed from the center of the bolt mounting through hole. distance to the inner peripheral wall, the bolt and equal to or approximate to the distance from the center of the mounting through hole to the outer peripheral edge of the flange, the inner peripheral wall of the recess, the bolt taken of It is an arcuate equal or close to that radius r at a distance d from the center of use through-hole to the outer edge of the flange.
[0015]
In this case, the shape of the inner peripheral wall of the recess includes not only a curved surface but also a straight line, and includes both a curved surface and a straight line.
[0016]
According to the present invention, the radial flow of the flesh portion inevitably occurs when the bolt is mounted to each bolt mounting through-hole, but the flow of the flesh portion is absorbed by distorting the inner peripheral wall of the recess. As a result, distortion is less likely to occur in the vicinity of the opening on the flange outer end face side in the bolt mounting through hole, and distortion is also less likely to occur in the entire area on the flange outer end face. Therefore, the flange outer end surface is kept flat, and the mounting posture of the disc rotor with respect to the flange outer end surface of the hub wheel can be stabilized.
[0017]
As a preferred embodiment of the present invention, the recess is closed with respect to the outer peripheral edge of the flange.
As a preferred embodiment of the present invention, a plurality of the concave portions are provided in a region between the bolt mounting through holes adjacent in the circumferential direction.
[0018]
In this case, the distance from the center of the bolt mounting through hole to the inner peripheral wall of the recess includes the distance from the center of the through hole for bolt mounting to any part of the inner peripheral wall of the recess. The distance from the center of the bolt mounting through-hole to the location of the inner peripheral wall of the recess is longer or shorter than the distance from the center of the bolt mounting through-hole to the outer peripheral edge of the flange, or the entire recess The distance from the center of the bolt mounting through hole to the inner peripheral wall of the recess includes the case where the distance from the center of the bolt mounting through hole to the outer peripheral edge of the flange is equal.
[0019]
According to such an embodiment, the flesh that is dispersed and flowing radially from the periphery of the bolt mounting through-hole can be evenly absorbed by the inner wall of the recess in the radial direction, thereby suppressing the occurrence of distortion in the entire area of the flange outer end surface. Thus, the outer end face of the flange is effectively kept flat. Therefore, the mounting posture of the disc rotor with respect to the flange outer end surface of the hub wheel can be further stabilized.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0021]
1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an axle bearing device according to an embodiment, and FIGS. 2A and 2B are sectional views taken along line (2)-(2) in FIG. FIG. 2A and FIG. 2B are different from each other in the shape of a concave inner peripheral wall described later , and FIG. 2A is a reference example . In these drawings, the same parts as those in FIGS. 8 and 9 are denoted by the same reference numerals.
[0022]
In the figure, 1 is an axle bearing device, 2 is a hub wheel, 3 is a double row outward angular ball bearing, 4 is a drive shaft, 5 is a disc rotor of a disc brake device, 6 is a knuckle, and 7 is a brake of the disc brake device. It is a pad.
[0023]
The disk rotor 5 is applied so as to be in close contact with the outer end surface of the flange 10 of the hub wheel 2 and is used for bolt mounting provided at equal intervals at the circumferential position of the flange 10, that is, at five positions in the embodiment. It is fixed to the outer end surface of the flange 10 by a bolt 12 that is inserted into the through hole 11 in a non-separable manner.
[0024]
A serration 13 is formed in a region on the head side in the screw shaft portion of the bolt 12. The serrations 13 of the bolts 12 are caused to bite into the circular inner peripheral surface of the bolt mounting through-holes 11, whereby the bolts 12 are fitted into the bolt mounting through-holes 11. The bolt mounting through holes 11 are provided at equal intervals in the circumferential direction of the flange 10 with respect to each other.
[0025]
A feature of this embodiment is that a recess 20 is provided in the region on the outer end surface of the flange 10 between the bolt mounting through holes 11 adjacent in the circumferential direction so as to penetrate in the thickness direction. In this case, the recess 20 is widened in the circumferential direction and is open to the outer peripheral edge 10 c of the flange 10. Further, the recess 20 is formed by cutting, forging, or other machining.
[0026]
As a result, the region in which the bolt mounting through-hole 11 is present in the flange 10 is in the form of a convex portion 10 a that is raised relative to the concave portion 20 in the direction of the outer end surface.
[0027]
The convex portion 10a and the other surface of the flange 10 opposite to the convex portion 10a are finished by machining such as turning.
[0028]
In this case, the shape of the inner peripheral wall 20a of the recess 20, as shown in FIG. 2 (a), which is a linear shape is a reference example. As shown in FIG. 2B , the invention according to the present invention has a curved shape, in particular, a curved shape of an arc having a radius r equal to the distance d from the center of the bolt mounting through hole 11 to the outer peripheral edge of the flange 10. .
[0029]
In the case of FIG. 2 (a), there is an inner peripheral wall portion of the concave portion 20 that approximates a distance d from the center of the bolt mounting through hole 11 to the outer peripheral edge 10c of the flange 10 among the inner peripheral wall 20a of the concave portion 20. When the bolts 12 are fitted and installed in the bolt mounting through holes 11, the flesh that is dispersed and flowing radially from the periphery of the bolt mounting through holes 11 can be absorbed almost uniformly in the radial direction. It is possible to suppress the occurrence of distortion in the entire area of the outer end surface of the.
[0030]
In the case of FIG. 2B, the entire inner peripheral wall 20 a of the recess 20 is equal to the distance from the center of the bolt mounting through hole 11 to the outer peripheral edge of the flange 10, and the bolt 12 with respect to the bolt mounting through hole 11. Can be absorbed evenly in the radial direction, and the occurrence of distortion in the entire outer end surface of the flange 10 can be further suppressed. It becomes possible to do.
[0031]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
[0032]
(1) In the embodiment, the recess 20 is open to the outer peripheral edge 10c of the flange 10, but its circumferential opening width is long. As a reference example, as shown in FIG. A groove shape with a short open width is conceivable. The inner peripheral wall 20a of the groove may be linear as shown in FIG. 3, or may be curved although not shown.
[0033]
(2) In the embodiment, the number of the recesses 20 is one in the region between the bolt mounting through holes 11 adjacent in the circumferential direction. However, as shown in FIG. However, two may be provided in the area. In this case, the recesses 20 on both sides of the bolt mounting through-hole 11 are provided close to the bolt mounting through-hole 11. As a result, it is possible to effectively absorb the flowing meat portion and further suppress the occurrence of distortion in the entire area of the outer end surface of the flange 10.
[0034]
Further, in this case, the shape of the concave portions 20 on both sides of the bolt mounting through-hole 11 is a linear example, but it is a curved shape, and in particular, from the center of the bolt mounting through-hole 11 to the flange 10. Assuming an arc shape having a radius r equal to or close to the distance d to the outer peripheral edge, the distance from the center of the bolt mounting through hole 11 to the inner peripheral wall 20a of the recess 20 is as follows. It becomes equal to the distance from the center to the outer peripheral edge 10c of the flange 10, and the absorption effect of the meat part is further increased, which is preferable.
[0035]
(3) In the above embodiment, the recess 20 is open to the outer peripheral edge 10c of the flange 10, but as a reference example, as shown in FIG. It is good also as a shape. The inner peripheral wall 20a of the recess 20 shown in Figure 5 also may be made to correspond to the shape of the inner peripheral wall 20a of the recess 20 shown in FIG. 2 (b). Also in such a case, the inner peripheral wall 20a approximates or is equal to the distance from the center of the bolt mounting through hole 11 to the outer peripheral edge 10c of the flange 10, and the same effect as the above-described embodiment can be obtained.
[0036]
(4) The recess 20 in FIG. 4 is open to the outer peripheral edge of the flange 10, but as shown in FIG. 6, the shape of the recess 20 closed with respect to the outer peripheral edge 10 c of the flange 10 is also possible. Good. The inner peripheral wall 20a of the recess 20 shown in FIG. 6 may also correspond to the shape of the inner peripheral wall 20a of the recess 20 shown in FIG. Also in such a case, the inner peripheral wall 20a approximates or is equal to the distance from the center of the bolt mounting through hole 11 to the outer peripheral edge 10c of the flange 10, and the same effect as the above-described embodiment can be obtained.
[0037]
(5) In the above-described embodiment, as shown in FIG. 1, the hub wheel 2 has a structure in which one inner ring of the double row outward angular ball bearing 3 is also used. The present invention can also be applied to a structure with a separate structure.
[0038]
(6) In the above-described embodiment, the axle bearing device 1 used for the drive wheel is illustrated in FIG. 1, but the present invention can also be applied to a type used for a known driven wheel as shown in FIG. The axle bearing device used for the driven wheel of FIG. 7 has a configuration in which a double row rolling bearing such as a double row outward angular ball bearing 3 is disposed on the inner periphery of the hub wheel 2. The hub wheel 2 here is used as an outer ring of the double-row outward angular ball bearing 3, and includes two rows of balls 31, two cages 32, 33, and two inner rings 34, 35. Yes. Even in such a case, although not shown in detail, the characteristic configuration shown in each of the above-described embodiments is applied.
[0039]
【The invention's effect】
As described above, according to the present invention, when the bolt is attached to the bolt mounting through hole by the inner peripheral wall of the recessed portion provided in the region between the bolt mounting through holes adjacent in the circumferential direction, the bolt mounting Since the flesh that flows radially from the through hole is absorbed, distortion is less likely to occur over the entire area of the flange outer end surface, and the outer surface of the flange is kept flat. The mounting posture can be stabilized.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an axle bearing device according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line (2)-(2) in FIG. 1. FIG. FIG. 4 is a diagram corresponding to FIG. 2 according to another modified example of the flange. FIG. 5 is a diagram corresponding to FIG. 2 according to a reference example of the flange. FIG. 8 is a longitudinal sectional side view showing the upper half of an axle bearing device for a driven wheel to which the present invention can be applied. FIG. 8 is a longitudinal sectional view of a conventional axle bearing device. ) Cross-sectional view along the line [FIG. 10] Explanatory diagram for pointing out conventional defects [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Axle bearing device 2 Hub wheel 3 Drive shaft 5 Disc rotor 10 Hub wheel flange 11 Bolt mounting through hole 12 Bolt 13 Bolt serration 20 Recess

Claims (3)

A bearing device for an axle mounted by a bolt in a state where a disc rotor of a disc brake device is applied to an outer end face of a radially outward flange of a hub wheel,
The bolt is serrated on the head side of the screw shaft,
Bolt mounting through holes are provided at a plurality of locations in the circumferential direction of the flange,
The bolt is inserted with the serration biting into the inner peripheral surface of the bolt mounting through-hole,
A recess in the thickness direction is provided in a region on the outer end surface between the bolt mounting through holes adjacent in the circumferential direction of the flange,
The distance from the center of the bolt mounting through hole to the inner peripheral wall of the recess is equal to or approximate to the distance from the center of the bolt mounting through hole to the outer peripheral edge of the flange ;
The axle bearing device according to claim 1, wherein the inner peripheral wall of the recess has an arc shape having a radius r equal to or approximate to a distance d from the center of the bolt mounting through hole to the outer peripheral edge of the flange . The axle bearing device according to claim 1 ,
The axle rolling contact device is characterized in that the recess is closed with respect to the outer peripheral edge of the flange. The axle bearing device according to claim 1 or 2 ,
A plurality of the recesses are provided in a region between the bolt mounting through holes adjacent in the circumferential direction.

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