JP2581588B2 - How to combine disc rotor and axle hub - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of combining a disc brake disc rotor and an axle hub, which is generally provided in automobiles and other vehicles, and particularly to easily and axially swing the assembled disc rotor. The present invention relates to a method for combining a disc rotor and an axle hub which can be effectively reduced.

[Conventional technology]

A work procedure for assembling a disc brake disc rotor of a passenger car or the like to an axle hub is usually performed by pressing a hub bolt d into a hub bolt press-fitting bolt hole c formed in a flange portion b of an axle hub a as shown in FIG. After the disc rotor e is inserted into the hub bolt d to combine the axle hub a with the disc rotor e, the hub bolt d projecting outward from the disc rotor e
Through the disk portion f of the wheel, and fastened with the hub nut g. In the figure, h is a knuckle spindle, and i and j are bearings.

[Problems to be solved by the invention]

However, if the assembled disk rotor e swings in the direction of the axis k (arrow u) as shown in FIG.
A brake pad (not shown) built in the caliper 1 intermittently contacts the disk rotor e to cause a so-called “brake drag”, and as shown in FIG. 10, a contact surface corresponding to an angular position where the runout is large. Uneven wear m and n are generated on the surface. This uneven wear proceeds with an increase in the traveling distance, and the thickness p at the contact surface of the disk rotor e changes in the circumferential direction. Therefore, when the brake is operated during running in such a state, the difference in thickness p of the disc rotor e intermittently pushes back the hydraulic piston (not shown) in the caliper l via the brake pad, and pulsation occurs in the brake fluid. Let it. This pulsation causes the vehicle body or the brake pad to resonate, causing a so-called “Brake judder”, which significantly impairs quality. Many factors other than the rigidity of the vehicle body and the material of the brake pad are involved in the occurrence of this "brake judder", as well as the rigidity of the suspension arm and many other factors.
The problem is complicated, at the moment "brake judder"
There is no definitive measure to prevent the occurrence of the problem.

The deflection of the disk rotor e in the assembled state is originally
It depends on the precision of the cutting process of the disc rotor e and the axle hub a, the strength of the inner wall of the bolt hole for holding the hub bolt d, and the like. However, when the hub bolt d is pressed into the bolt hole c as described later, the bolt hole There is also a problem that the flange portion b around c is raised outward and the assembling of the disk rotor e becomes unstable. As a measure for improving the insufficient strength of the inner wall of the bolt hole, the inner wall of the bolt hole is made of a composite material. A forming method has been proposed (JP-A-59-167301).
No.). However, this measure is also "brake judder"
It is not enough to prevent the occurrence of vibration, and it has been strongly desired to establish a measure that can effectively reduce the run-out.

In view of the above problems, the present invention improves the finishing accuracy of the disk rotor and the axle hub, or increases the processing cost and material cost such as forming the hub bolt hole with a special material, and thus, after assembling. An object of the present invention is to provide a method of combining a disk rotor and an axle hub that can effectively reduce the runout of a disk rotor and prevent the occurrence of excessive “brake judder”.

[Means for solving the problem]

The above object is to provide a disc rotor when a hub bolt is press-fitted into a bolt hole formed in a flange portion of an axle hub, and a disc rotor for disc brake and a wheel are sequentially brought into close contact with the flange portion through the hub bolt to be integrally assembled. In the method of assembling the axle hub, before assembly, the axial runout of the disk rotor and the axle hub is measured, and the angular position at which the runout value of one of the disk rotor or the axle hub is almost maximum and the other runout value are obtained. By assembling the disc rotor and axle hub so that the angular positions that are almost minimized substantially match each other, and pre-boring the part surrounding the bolt hole end opening drilled in the flange part of the axle hub facing the disk rotor Is solved.

[Action]

Since the run-out of the disc rotor alone and the run-out of the axle hub flange alone are offset, the run-out of the disc rotor in the assembled state is reduced, and excessive
The occurrence of "judder" can be prevented.

Further, by boring the periphery of the bolt hole end opening of the flange portion of the axle hub, it is possible to prevent deformation of the flange portion of the axle hub when the hub bolt is press-fitted. Therefore, the disk rotor and the flange portion of the axle hub can be tightly connected to each other and firmly connected to each other, so that the run-out during assembly can be stably maintained for a long period of time.

〔Example〕

Hereinafter, the principle of the present invention and an example of a method for carrying out the present invention will be described with reference to FIGS.

As described above, the "brake judder" is a phenomenon in which the piston in the caliper causes a pumping phenomenon due to uneven wear caused by the deflection of the disc rotor, and the vibration is amplified, causing the vehicle body and the brake pedal to resonate.・ To prevent the occurrence of judder, it is necessary to improve the flatness of each component, especially the contact surfaces of the axle hub and the disc rotor, and to keep this accuracy within a certain range. Means that it is necessary to keep the run-out value in the assembled state of the axle hub, disk rotor, knuckle spindle and the like within a certain fixed value. Therefore, repeated tests with actual vehicles were conducted, and the relationship between the swing value of the disk rotor and axle hub assembly and the judder level, which were particularly important, was examined in detail. The swing value of the disk rotor and axle hub assembly was 40 microns (μm ), It was found that judder levels increased sharply. Therefore, it was concluded that if the run-out value of the assembly of the disc rotor and the axle hub could be kept below 40 microns, it would be possible to prevent the occurrence of excessive brake judder.

On the other hand, when the run-out of the disk rotor 11 before assembly (see FIGS. 1 and 5) was examined, the contact surface 12 of the disk rotor 11 was only cut, and the circumferential distribution of run-out values was shown in FIG. Is represented by a primary waveform 13 as shown in FIG. Similarly, the axle hub 14 before assembly (see FIGS. 3 and 6)
The run-out value of the flange part 15 is also a primary waveform as shown in FIG.
Represented by 16.

Next, when the protrusion of the flange portion 15 around the bolt hole 17 when the hub bolt 18 is pressed into the bolt hole 17 of the axle hub 14 is examined, the protrusion forms a quaternary waveform 19 in the circumferential direction as shown in FIG. The disk rotor 11 in this state.
When the disk rotor 11 is mounted on the axle hub 14, the disc rotor 11 and the flange portion 15 of the axle hub 14 cannot be sufficiently close to each other, and there is a possibility that the run-out at the time of mounting cannot be stably held.

Therefore, when attaching the disk rotor 11 to the axle hub 14, if the phases are shifted by 180 degrees so that the primary waveforms 13 and 16 cancel each other, and the two are combined, the deflection of the assembled disk rotor 11 is greatly reduced. As a result, excessive "brake judder" can be prevented from occurring. In addition, by preventing deformation of the flange portion 15 of the axle hub at the time of press-fitting the hub bolt, it is possible to stably hold the mounted disk rotor 11 for a long period of time.

Hereinafter, an example of a method for implementing the present invention based on the above-described principle will be described. First, as shown in FIG. 6, the flange portion 15 of the axle hub facing the disc rotor 11
A boring process 20 is performed around the open end of each bolt hole 17 drilled.

The hub bolt 18 is firmly held by the flange portion 15 of the axle hub 14 via a press-fit portion of the hub bolt 18 and splines 21 and 21 'provided on the inner wall of the bolt hole 17.

Next, with respect to the disk rotor 11 and the flange portion 15 of the axle hub, the run-out value in the direction of the axis 22 is determined at each angular position 1, 2, 3,.
8, paint check 23 is applied to the angular position 6 corresponding to the minimum run-out value r (see FIG. 2) of the disk rotor 11, and the maximum run-out value s of the flange portion 15 of the axle hub 14 (see FIG. 4). The paint check 24 is also applied to the angular position 6 corresponding to the above-mentioned reference), and the disc rotor 11 is combined with the axle hub 14 using the paint checks 23 and 24 as a mark. When combined in the manner described above, it is preferable that the positions of the bolt holes 25, 17 of the disk rotor 11 and the axle hub 14 exactly match. For this purpose, for example, the bolt holes 25 of the disk rotor 11 are drilled. Beforehand, it is convenient to measure the runout values of the desk rotor 11 and the axle hub 14 in advance, determine the combination position, and then drill the bolt holes of the disk rotor 11.

At the time of combination, a paint check (not shown) is performed on the angular position 2 corresponding to the maximum runout value r 'of the disk rotor 11 and the angular position 2 corresponding to the minimum runout value s' of the axle hub 14, respectively. The check may be made in conformity with the check, and a stamp or other appropriate check mark may be applied instead of the paint check.

The runout frequency curve 27 of the disc rotor and axle hub assembling according to the method of the present invention and the conventional method, that is, the runout frequency of the disc rotor and axle hub assemble randomly and ignoring the runout phase. Curve 28 is shown in FIG. As shown in the figure, according to the method of the present invention, it can be seen that all the run-out values satisfy the specified value (40 μm or less). Therefore, generation of excessive "brake judder" can be prevented, and comfortable running for a long period of time is guaranteed.

It should be noted that the present invention is not limited to only the above-described embodiments, and it is needless to say that various changes can be made without departing from the spirit of the present invention.

〔The invention's effect〕

As described above, the present invention exhibits the following excellent effects.

[I] The disk rotor and the axle hub are measured in the axial direction of the disk rotor and the axle hub, respectively, and the disk rotor and the axle hub are combined and assembled so that the vibrations of both are canceled out. Therefore, the occurrence of excessive "brake judder" can be prevented.

[Ii] Since the boring process is applied to the periphery of the bolt hole end opening of the flange portion of the axle hub facing the disk rotor, the flange portion is not deformed, and the deflection value at the time of assembling the disk rotor over a long period of time. It can be stably held.

(Iii) By providing alignment marks so as to leave the combination position of the disk rotor and the flange portion of the axle hub, there is no danger of mistakes in the combination during the replacement work of the disk rotor in the aftermarket. The set swing value can be reliably reproduced.

[Iv] Since the run-out value can be guaranteed for each component alone, the management cost in the assembled state can be reduced.

[Brief description of the drawings]

1 to 7 are explanatory views for carrying out the method of the present invention. FIG. 1 is a front view of a disk rotor, FIG. 2 is a circumferential distribution diagram of disk rotor runout, and FIG. FIG. 4 is a front view of a flange portion of the axle hub, FIG. 4 is a circumferential distribution diagram of runout in the flange portion of the axle hub, FIG. 5 is a cut side view of the disk rotor, FIG. 6 is a cut side view of the axle hub, and FIG. FIG. 8 shows a frequency curve of a swing value of a disc rotor and an axle hub according to the method of the present invention and a swing curve of a swing value of a disc rotor and an axle hub according to a conventional method. FIG. 9 is an explanatory view of a disk rotor that is swinging, and FIG. 10 is an explanatory view of a disk rotor in which uneven wear has occurred. 11: Disc rotor 14: Axle hub, 15: Flange 17: Bolt hole, 18: Hub bolt 22: Axis r: Minimum run-out value of disc rotor s: Maximum run-out value of flange portion of axle hub

Claims (2)

(57) [Claims] 1. A disk rotor when a hub bolt is press-fitted into a bolt hole formed in a flange portion of an axle hub, and a disk rotor for a disk brake and a wheel are sequentially brought into close contact with the flange portion through the hub bolt to be integrally assembled. In the method of assembling the axle hub, the axial runout of the disc rotor and the axle hub is measured before assembly, and the angular position at which the runout value of one of the disk rotor or the axle hub is almost maximum and the other runout value are obtained. A method for combining a disc rotor and an axle hub, wherein the disc rotor and the axle hub are combined so that the angular positions that are substantially minimized substantially coincide with each other. 2. A combination of a disc rotor and an axle hub according to claim 1, wherein a portion surrounding a bolt hole end opening formed in a flange portion of the axle hub facing the disc rotor is pre-bored. Method.