JP4048700B2 - 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 through holes (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 meat portion that flows outward in the radial direction of the flange 10 from the through hole 11 for bolt attachment is absorbed by the outer edge of the flange 10, but the meat that flows in the circumferential direction of the through hole 11 for bolt attachment. As for the portion, since there is no portion that absorbs the meat portion in the region between the circumferential directions of the bolt mounting through-holes 11, the meat portion stops in that region, so that the outer end surface direction of the flange 10 A convex deformation is generated toward the surface.
[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]
An axle bearing device according to the present invention is an axle bearing device that is attached in a state in which a disc rotor of a disc brake device is applied to an outer end surface of a radially outward flange of a hub wheel, the circumferential direction of the flange with bolt mounting through hole is provided in several places, the region between the bolt mounting through holes adjacent to each other in the circumferential direction cuts penetrating in its thickness direction is provided, said cuts, the outer peripheral edge of the flange In contrast, it is closed .
[0015]
The shape of the cut in this case includes not only a curved surface but also a straight line, and includes both a curved surface and a straight line, or the length of the cut.
[0016]
According to the present invention, although the radial flow of the meat part can inevitably occur at the time of bolt mounting to each bolt mounting through hole, the flow of the meat part described above distorts the inner peripheral surface of the cut. Therefore, 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.
[0018]
In particular, in the present invention, the notch has a shape closed with respect to the outer peripheral edge of the flange. According to such a shape , it is preferable that the fluidized meat part can be absorbed while the strength of the flange is kept high.
[0019]
In a preferred embodiment of the present invention, the distance from the center of the bolt mounting through hole to the inner peripheral surface of the notch is equal to or close to the distance from the center of the bolt mounting through hole to the outer peripheral edge of the flange.
[0020]
In this case, the distance from the center of the through hole for bolt mounting to the inner peripheral surface of the notch includes the distance from the center of the through hole for bolt mounting to any part of the incision. The distance from the center of the bolt mounting through hole to the inner peripheral surface of the notch 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 over the entire notch. The distance from the center of the bolt mounting through hole to the inner peripheral surface of the notch includes the case where it is equal to the distance from the center of the bolt mounting through hole to the outer peripheral edge of the flange.
[0021]
According to such an embodiment, it is possible to uniformly absorb in the radial direction the flesh that is dispersed and flowing radially from the periphery of the bolt mounting through-hole, thereby suppressing the occurrence of distortion in the entire area of the flange outer end surface. The end face 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.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0023]
1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an axle bearing device of an embodiment, and FIG. 2 is a sectional view taken along line (2)-(2) in FIG. In these drawings, the same parts as those in FIGS. 8 and 9 are denoted by the same reference numerals.
[0024]
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.
[0025]
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.
[0026]
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.
[0027]
A feature of this embodiment is that a notch 20 penetrating in the thickness direction is provided in a region between the bolt mounting through holes 11 adjacent in the circumferential direction. In this case, the notches 20 are widened in the circumferential direction and open to the outer peripheral edge of the flange 10.
[0028]
Accordingly, the flange 10 is configured by a plurality of projecting pieces 10a such as petals separated in the circumferential direction for each region where the through holes 11 for bolt attachment are present.
[0029]
In this case, the shape of the notch 20 is an arc shape having a radius r that is equal to or approximate to the distance d from the center of the bolt mounting through-hole 11 to the outer peripheral edge of the flange 10. The distance from the center to the inner peripheral surface 20a of the notch 20 is equal to or approximate to the distance from the center of the bolt mounting through hole 11 to the outer peripheral edge 10c of the flange 10.
[0030]
As a result, when the bolts 12 are fitted into 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 evenly absorbed in the radial direction. The occurrence of distortion in the entire area of the outer end surface of the flange 10 can be suppressed.
[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 cut 20 is open to the outer peripheral edge of the flange 10, but since the circumferential opening width is long, the strength of each protruding piece 10a may be reduced. Therefore, as shown in FIG. 3, the reinforcing pieces 10b may be integrally formed in the circumferential direction between the protruding pieces 10a to be reinforced. In this case, the cut 20 has a closed shape with respect to the outer peripheral edge of the flange 10.
[0033]
(2) In the embodiment, the incision 20 has a long circumferential opening width, but as shown in FIG. 4, it may have a slit shape with a shortened circumferential opening width. In this case, the distance from the center of the bolt mounting through hole 11 to the inner peripheral surface 20a of the slit-shaped cut 20 is longer than the distance from the center of the bolt mounting through hole 11 to the outer peripheral edge 10c of the flange 10. As much as possible, it may have a curved surface or an arc shape so that the flesh that is dispersed and flowing radially from the bolt mounting through holes 11 can be absorbed as evenly as possible in the radial direction. The notch 20 shown in FIG. 4 is open to the outer peripheral edge of the flange 10.
[0034]
(3) In the embodiment, the number of the notches 20 is one in the region between the bolt mounting through holes 11 adjacent in the circumferential direction. However, as shown in FIG. Good. In this case, the notches 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.
[0035]
Further, in this case, the shape of the notches 20 on both sides of the bolt mounting through hole 11 is also an arc shape having a radius r that is equal to or approximate to the distance d from the center of the bolt mounting through hole 11 to the outer peripheral edge 10c of the flange 10. Thus, the distance from the center of the bolt mounting through hole 11 to the inner peripheral surface 20a of the notch 20 is equal to or approximate to the distance from the center of the bolt mounting through hole 11 to the outer peripheral edge 10c of the flange 10. By doing so, it is possible to obtain the same effect as the embodiment.
[0036]
(4) In the embodiment, the cut 20 is open to the outer peripheral edge of the flange 10, but may have a through-hole shape closed to the outer peripheral edge of the flange 10 as shown in FIG. 6. Also in the case of the through-hole shaped notch 20 shown in FIG. 6, a circle having a radius r equal to or approximate to the distance d from the center of the bolt mounting through-hole 11 to the outer peripheral edge 10c of the flange 10. The distance from the center of the bolt mounting through hole 11 to the inner peripheral surface 20a of the notch 20 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, or By approximating, it is possible to obtain the same effect as the embodiment.
[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 surface of the notch provided in the region between the bolt mounting through-holes adjacent in the circumferential direction, Since the flesh that flows radially from the periphery of the through hole is absorbed, distortion is less likely to occur across the entire outer surface of the flange, and the outer surface of the flange is kept flat. The mounting posture of the disc rotor 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. 2 is a diagram corresponding to FIG. 2 according to another variation of the flange. FIG. 5 is a diagram corresponding to FIG. 2 according to another variation of the flange. FIG. 6 is a diagram corresponding to FIG. FIG. 7 is a longitudinal 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. )-(9) Cross-sectional view along 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 Notch

Claims (2)

A bearing device for an axle that is attached in a state in which a disc rotor of a disc brake device is applied to an outer end surface of a radially outward flange of a hub wheel,
Bolt mounting through holes are provided at several locations in the circumferential direction of the flange, and incisions penetrating in the thickness direction are provided in regions between adjacent bolt mounting through holes in the circumferential direction . Closed against the outer periphery of the flange,
Axle bearing device characterized by the above. The axle bearing device according to claim 1,
Axle bearing, characterized in that the distance from the center of the bolt mounting through hole to the inner peripheral surface of the notch is equal to or close to the distance from the center of the bolt mounting through hole to the outer peripheral edge of the flange apparatus.

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