JP4062868B2 - 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]
An example of a conventional axle bearing device is shown in FIG. Here, an axle bearing device used on the drive wheel side is taken as an example. 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 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 that are inserted in through holes 11 provided in 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 axle bearing device 1 is attached to the drive shaft 4, the bolts 12 must be attached in advance to the through holes 11 of the flange 10. In addition, in 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 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. 10, the inner diameter of the through hole 11 expands although it is in units of μm. Due to the flow of the meat part due to the expansion, the surface accuracy is lowered 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 a disc rotor with respect to a hub wheel in an axle bearing device.
[0009]
[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 circumference of the flange Through holes are provided in several places, and the bolts for wheel mounting are inserted into the through holes so as to bite the serrations provided on the head side of the bolts, and at least the through holes in the outer diameter portion of the flange In accordance with the biting of the serration into the through hole, by providing a radial recess that reduces the radial thickness of the flange in a region corresponding to the biting region of the serration at least on the outer diameter side of the through hole. causes the flow of meat portions resulting Ri by the plastic deformation around the through-hole toward only in the radial direction of the through hole, the塑The flow of meat portions due to the deformation moves the region sandwiched between the recesses the said through-hole of the flange in the radial direction the recess side, characterized in that.
[0010]
In addition, the dent described above may be provided continuously in the outer diameter portion of the flange in the circumferential direction, or individually provided only in the phase region where each through hole exists in the outer diameter portion of the flange. it can.
Also, in the one provided individually only in the phase region where each through hole exists in the outer diameter portion of the flange, the dent is individually provided only in the phase region where each through hole exists in the outer diameter portion of the flange. It can be.
In addition, the dent may be formed only in an intermediate region in the axial direction of the outer diameter portion of the flange corresponding to the biting region of the serration.
[0011]
In this case, the outer diameter side of the through hole is thinned by a recess in the flange, thereby making it relatively brittle. Therefore, as the serrations bite into the through holes when the bolts are inserted, the flesh flows around the through holes and the through holes expand, but the flow of the flesh at that time is only in the radial direction of the through holes. It becomes difficult for the flow of the meat part to reach the outer end surface of the flange. Thereby, the outer end surface of a flange becomes difficult to deform | transform.
[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 the present invention. FIG. 1 is an enlarged view of a main part of a hub wheel in an axle bearing device, FIG. 2 is a diagram showing a state before mounting bolts in FIG. 1, and FIG. 3 is a view of a part of a flange from the inner end surface side. It is a perspective view.
[0014]
The overall configuration of the axle bearing device in this embodiment is the same as that shown in FIG.
[0015]
This embodiment is characterized in that a device for suppressing 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 is characterized.
[0016]
That is, as shown in the drawing, a recess 14 is provided in the outer diameter portion of the flange 10 on the outer diameter side of the through hole 11 and in the region corresponding to the biting region of the bolt serration 13 in the through hole 11 in the circumferential direction. . Here, the recess 14 has an axial diameter of approximately 1 from the center in the axial direction to the inner end surface, with an outer diameter dimension that has been conventionally set as a half of the axial direction from the center in the axial direction to the outer end surface of the flange 12. By setting the / 2 region to a small diameter, a step-shaped recess is formed. The radial thickness from the bottom of the recess 14 to the through hole 11 is preferably set as appropriate according to the biting allowance of the serration 13 of the bolt 12 with respect to the inner peripheral surface of the through hole 11. If the bite allowance is 0.5 mm, it is preferable that the radial thickness dimension from the bottom of the recess 14 to the through hole 11 is 3 mm, for example.
[0017]
In the embodiment described above, the flow of the meat portion due to plastic deformation around the through hole 11 occurs as the serration 13 bites into the through hole 11 when the bolt 12 is mounted, but the periphery of the through hole 11 at that time The flow of the flesh portion at this point is directed only in the radial direction of the through-hole 11, and is difficult to spread to the outer end surface of the flange. Therefore, it is advantageous for keeping the outer end surface of the flange 10 smooth.
[0018]
Accordingly, the disk 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, and the disk rotor 5 can be prevented from being inclined as in the conventional example. 5 can contribute to the improvement of the rotation accuracy.
[0019]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
[0020]
(1) The recesses 14 in the above embodiment are not provided in a circumferentially continuous shape, and are individually provided only in the phase region where the through holes 11 exist, as shown in FIGS. Also good. In this illustrated example, the recess 14 is formed over the entire length in the axial direction of the flange 12, but it may be formed only in the serration 13 biting region of the bolt 12 as in the embodiment shown in FIGS. 1 to 3. Also in this case, the same operation and effect as in the above embodiment can be obtained.
[0021]
(2) In the above-described embodiment, the bolt 12 is designed so that the serration 13 is bitten into a half region in the axial direction from the axial center of the through hole 11 to the inner end surface of the flange 10. However, when this bolt 12 is designed so that its serration 13 is inserted into the intermediate region in the axial direction of the through hole 11, as shown in FIG. 7 and FIG. The recess 14 provided on the outer diameter surface can be formed in the axially intermediate region of the flange 10 in a form continuous to the entire circumference. Also in this case, the recess 14 does not need to be continuously formed on the entire circumference of the flange 10 and may be individually formed only in the phase region where the through hole 11 exists.
[0022]
(3) In the above embodiment, as shown in FIG. 9, the hub wheel 2 has a structure in which one inner ring of the double-row outward angular ball bearing 3 is also used, but although not shown, the one inner ring is connected to the hub wheel 2. The present invention can be applied to a separate structure.
[0023]
(4) In the above embodiment, the axle bearing device 1 used for the drive wheel is illustrated in FIG. 9, 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. 11 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 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 and 33, and two inner rings 34 and 35. . Even in such a case, although not shown in detail, the characteristic configuration shown in each of the above-described embodiments is applied.
[0024]
【The invention's effect】
According to the first to third aspects of the present invention, the flow of the flesh around the through hole due to the biting of the serration when the bolt is attached to the through hole of the flange is directed only to the radial direction of the through hole to the outer end surface of the flange. Since it is devised not to spread, it is advantageous to keep the outer end face of the flange smooth.
[0025]
According to the first to fifth aspects of the present invention, the flow of the meat part around the through hole accompanying the biting of the serration when the bolt is attached to the through hole of the flange is directed to the outer end surface of the flange so as to be directed only in the radial direction of the through hole. Since it is devised not to spread, it is advantageous to keep the outer end face of the flange smooth.
[Brief description of the drawings]
FIG. 1 is an enlarged view of a main part of a hub wheel in an axle bearing device according to an embodiment of the present invention. FIG. 2 is a diagram showing a state before a bolt is mounted in FIG. FIG. 4 is an enlarged view of a main part of a hub wheel in an axle bearing device according to another embodiment of the present invention. FIG. 5 is a diagram showing a state before a bolt is mounted in FIG. 6 is a perspective view of a part of the flange of FIG. 5 as viewed from the inner end surface side. FIG. 7 is an enlarged view of a main part of a hub wheel in an axle bearing device according to another embodiment of the present invention. FIG. 9 is a longitudinal sectional side view showing a conventional bearing device for an axle for a driving wheel. FIG. 10 is an explanatory diagram for pointing out a defect in the conventional example. Vertical side view showing the upper half of an axle bearing device for a driven wheel to which the invention can be applied Description]
DESCRIPTION OF SYMBOLS 1 Axle bearing device 2 Hub wheel 3 Drive shaft 5 Disc rotor 10 Hub wheel flange 11 Flange through-hole 12 Bolt 13 Bolt serration 14 Flange recess

Claims (5)

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,
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 in a form that bites serrations provided on the head side of the bolts,
In the outer diameter portion of the flange, at least on the outer diameter side of the through hole, and in the region corresponding to the serrated biting region in the through hole, by providing a radial recess that reduces the radial thickness of the flange ,
With the biting into the through hole of the serration, the flow of meat portions resulting Ri by the plastic deformation around the holes caused toward only in the radial direction of the through-hole and a wall portion by the plastic deformation An axle bearing device, wherein a region sandwiched between the through hole and the dent of the flange is moved to the dent side in the radial direction by flow . The axle bearing device according to claim 1,
The axle bearing device according to claim 1, wherein the recess is provided continuously in an outer diameter portion of the flange in the circumferential direction. The axle bearing device according to claim 1,
The axle bearing device according to claim 1, wherein the recess is individually provided only in a phase region where each through hole exists in an outer diameter portion of the flange. The axle bearing device according to claim 3,
The axle bearing device, wherein the recess is formed over the entire axial length of the outer diameter portion of the flange. The axle bearing device according to claim 2 or 3,
The axle bearing device according to claim 1, wherein the recess is formed only in an intermediate region in the axial direction of the outer diameter portion of the flange corresponding to the biting region of the serration.

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