JP4304804B2 - Hub unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hub unit to which wheels are attached.
[0002]
[Prior art]
A basic configuration of this type of conventional hub unit is shown in FIG. Here, a hub unit used on the drive wheel side is taken as an example. In the figure, 1 is a hub unit, 2 is a hub wheel, 3 is a double row outward angular ball bearing, 4 is a drive shaft, 5 is a disk rotor of a disk brake device, 6 is a shaft case, and 7 is a brake pad.
[0003]
The disk rotor 5 is attached in a state of being applied to the outer end surface of the flange 10 of the hub wheel 2. The disk rotor 5 is fixed by bolts 12 and wheel nuts (not shown) that are inserted in through holes 11 provided at several places on the circumference of the flange 10 in a non-separated state.
[0004]
In the first place, since the disk rotor 5 is attached after the hub unit 1 is attached to the drive shaft 4, the bolts 12 must be attached to the through holes 11 of the flange 10 in advance. Further, when handling the hub unit 1 alone, it is difficult to drop the bolt 12 described above, so the bolt 12 is attached to the through hole 11 in a non-separable manner.
[0005]
Conventionally, in order to make the above-described bolt 12 non-separable from the through-hole 11, the serration 13 is formed only in the head side region in the screw shaft portion of the bolt 12. It is configured to be fitted and installed so as to bite into the circular inner peripheral surface of the through hole 11.
[0006]
[Problems to be solved by the invention]
In the above conventional example, the serration 13 of the bolt 12 is bitten into the through hole 11 in order to attach the bolt 12 to the through hole 11 in a non-separable manner. The surface accuracy may decrease, for example, the outer end surface of the flange 10 may be undulated while being minute in the circumferential direction. Specifically, when the bolt 12 is attached to the through-hole 11, as shown in FIG. 6, the opening side of the through-hole 11 is centered in the thickness direction of the flange 10 while the inner diameter of the through-hole 11 expands in units of μm. The flesh flows in a form that sinks to the side. Due to the flow of the meat part, the surface accuracy is reduced as described above.
[0007]
If the surface accuracy of the outer end surface of the flange 10 is reduced in this way, the disk rotor 5 cannot be brought into close contact with the flange 10, so that the disk rotor 5 may be inclined and its rotational accuracy may be reduced. .
[0008]
In view of such circumstances, an object of the present invention is to stabilize the mounting posture of the disc rotor with respect to the hub wheel in the hub unit.
[0009]
[Means for Solving the Problems]
Hub unit of the present invention is a hub unit mounted in a state where the disc rotor is an assigned disk brake device on the outer end surface of the radially outward flange of the hub wheel, the through-holes in the circumferential several places of the flange The wheel mounting bolt is inserted in this through hole so that the serration provided on the head side of the bolt is inserted into the through hole, and on the opening side of the bolt on the head side of the through hole of the flange. projecting pieces are provided, et al is serration of the bolt to be attached to the through hole is bitten, the projecting piece is intended to be placed independently in a circumferential several places of the opening of the through hole, it is characterized in that .
[0011]
In this case, when the bolt is installed in the through hole, the bolt serrations are bitten into the projecting piece provided on the upstream side in the bolt mounting direction in the through hole. Although it is bent outward in the radial direction, the flow of the meat part as in the conventional example does not occur in the flange. Therefore, the outer end surface of the flange does not need to be deformed at all.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0013]
1 to 3 show an embodiment of a reference example of the present invention. FIG. 1 is an enlarged view of a main part of a hub wheel in a hub unit, FIG. 2 is a view showing a state before attaching a bolt in FIG. 1, and FIG. 3 is a perspective view of a part of a flange as viewed from the inner end face side. is there. The embodiment of the present invention is shown in FIG. 4 and will be described after the reference example.
[0014]
The overall configuration of the hub unit in this embodiment is the same as that shown in FIG.
[0015]
In this embodiment, in order to suppress the outer end surface of the flange 10 from undulating when the bolt 12 is attached to the through hole 11 of the flange 10 of the hub wheel 2, a device as described below is applied. Yes.
[0016]
That is, as shown in the figure, a ring-shaped protruding piece 14 concentrically and continuously in the circumferential direction is provided at the opening of the through hole 11 on the inner end face side of the flange 10.
[0017]
As shown in FIG. 2, the biting allowance is managed by setting the inner diameter R1 of the ring-shaped projecting piece 14 smaller than the outer diameter R2 of the serration 13 of the bolt 12. The biting allowance is preferably as small as possible to suppress the undulation of the outer surface of the flange, but a certain biting allowance is required to hold the bolt 12 from the through hole 11 without being easily pulled out and to prevent rotation. is required.
[0018]
In the embodiment described above, when the bolt 12 is mounted in the through hole 11, the serration 13 of the bolt 12 bites into the ring-shaped projecting piece 14 provided on the upstream side in the bolt 12 mounting direction in the through hole 11. Therefore, only the ring-shaped projecting piece 14 bends radially outward with this biting, but the flow of the flesh does not occur in the flange 10 as in the conventional example, and the outer end face of the flange 10 is not deformed at all. Result. Therefore, since the outer end surface of the flange 10 can be kept smooth, the disc rotor 5 can be brought into close contact with the outer end surface of the flange 10 in which the bolts 12 are not separated without being inclined. Thus, the rotation accuracy of the disk rotor 5 can be improved.
[0020]
An embodiment of the present invention will be described with reference to FIG. The present invention is different in configuration in the protruding piece 14 of the reference example. As shown in FIG. 4, the protruding pieces 14 in the embodiment of the present invention are a plurality of protruding pieces 14 that are discontinuously independent in the circumferential direction. In this case, when the bolt 12 is attached to the through-hole 11, the serration 13 of the bolt 12 bites into each protruding piece 14, and at that time, each protruding piece 14 bends independently independently. When the projecting pieces 14 are bent, almost no tensile stress or the like is exerted on the flange 10, which is more effective in keeping the outer end surface of the flange 10 smooth.
[0021]
Above Symbol embodiment has illustrated an example of a hub unit 1 in FIG. 5, as another structural example, some shown in FIG. The hub unit 1 shown in FIG. 7 is an off-the-shelf product having inner and outer rings for the double-row outward angular ball bearing 3, and the flange 21 provided in the bearing case 20 is bolted to the shaft case 6. It is supposed to be. Of course, the characteristic configuration of the present invention related to the through hole 11 of the flange 10 in the hub wheel 2 is the same as that of the above-described embodiment.
[0022]
Above Symbol embodiment has exemplified a driving wheel as the hub unit 1 in FIG. 5 and FIG. 7, also intended for a known driven wheels (not shown) can be applied the present invention.
[0023]
【The invention's effect】
In the present invention, when the bolt is mounted on the through hole of the flange, the serration of the bolt is caused to bite into the protruding piece provided on the upstream side in the bolt mounting direction in the through hole. Although it bends radially outward, the flesh does not flow around the through hole of the flange. Therefore, the outer end surface of the flange does not need to be deformed, and the smoothness can be reliably ensured.
[0024]
As described above, in the present invention, since the smoothness of the outer end surface of the flange can be ensured, it becomes possible to mount the disc rotor in an appropriate posture without tilting with respect to the outer end surface of the flange. Can contribute to improvement.
[Brief description of the drawings]
FIG. 1 is an enlarged view of a main part of a hub wheel in a hub unit according to a reference embodiment. FIG. 2 is a diagram showing a state before bolts are attached in FIG. relates to the implementation form of perspective view from the end face 4 of the present invention, a vertical sectional side view and FIG. 6 a conventional example showing a hub unit of FIG. 5 shows a drive wheel of the conventional example corresponding to FIG. 3 FIG. 7 is a longitudinal side view of the upper half showing another hub unit to which the present invention can be applied.
DESCRIPTION OF SYMBOLS 1 Hub unit 2 Hub wheel 3 Drive shaft 5 Disc rotor 10 Hub wheel flange 11 Flange through-hole 12 Bolt 13 Bolt serration 14 Flange-shaped projecting piece of flange

Claims (1)

A hub unit that is mounted in a state in which the disc rotor of the disc brake device is applied to the outer end surface of the radially outward flange of the hub wheel,
Through holes are provided in several places on the circumference of the flange, and the bolts for wheel mounting are inserted into the through holes so as to bite serrations provided on the head side of the bolts. the opening side of the bolt head side, projecting pieces bolt serrations is wedged to wearing provided we are in the through hole, and the protrusion is installed independently in the circumferential several places of the opening of the through hole A hub unit characterized by being a thing.

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