JPH0122985Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disc rotor for a disc brake, and more specifically, the invention relates to a disc rotor for a disc brake, and more specifically, a disc brake comprising an annular sliding plate part that is pressed by a pair of brake pads on the outer periphery of a flange part that is attached to a wheel hub. related to disc rotors.

Generally, in this type of disc rotor, the sliding plate portion is formed uniformly in the circumferential direction, and the mass and rigidity distribution of the sliding plate portion in the circumferential direction is uniform. For this reason, when the disc rotor is clamped by the brake pads, the mass and rigidity of the clamping part increase in appearance, and a steady vibration mode occurs on the disc rotor with this part as a reference, which is the cause of brake squeal. Become.

In order to deal with this, the present applicant locally changes the mass or rigidity of the sliding plate portion of the disc rotor in the circumferential direction to give the disc rotor directionality, and the vibration mode nodes and Various disc rotors have been devised in which the generation of a steady vibration mode is prevented by fixing the antinode. However, it has been found that even in these disc rotors, the occurrence of a steady vibration mode cannot always be sufficiently prevented in some cases.

As a result of various studies on this point, the inventors of the present invention found that even if the mass or rigidity of the sliding plate portion of the disc rotor is locally changed, if these unevenly distributed areas are small, the mass and stiffness due to the clamping pressure of the brake pads will be reduced. It has been found that the apparent increase in stiffness overcomes this and cannot sufficiently prevent the generation of steady vibration modes.

This invention was made based on this knowledge,
The main purpose is to create a structure for the sliding plate of this type of disc rotor that overcomes the apparent increase in mass and rigidity caused by the clamping pressure of the brake pads, and thereby sufficiently prevents the generation of steady vibration modes. The purpose is to prevent brake squeal.

In order to achieve this object, the present invention provides a disk rotor of this type, in which the sliding plate portion is arranged in four directions in the circumferential direction.
The mass and rigidity distribution in the circumferential direction of each of these parts is made uniform in the circumferential direction, and the other two parts of the other pair are divided into circles. Its structural feature lies in that the mass and rigidity distributions in the circumferential direction are mutually uniform, and that the mass or rigidity of the two pairs are different from each other. As a result, in the present invention, the area where the mass or rigidity of the sliding plate portion is unevenly distributed becomes extremely large, and it is possible to overcome the apparent increase in mass and rigidity caused by the clamping pressure of the brake pad. It is possible to prevent the steady vibration mode that occurs with reference to the brake part, thereby preventing brake squeal.

Hereinafter, the present invention will be explained based on the drawings. FIGS. 1 and 2 show a first embodiment of a disc rotor according to the present invention. This disc rotor 10 includes a mounting flange portion 11 to a wheel hub (not shown), and an annular sliding plate portion 12 which is clamped on the outer periphery of the flange portion 11 by a pair of brake pads (not shown).
The mounting flange portion 11 is provided with a mounting hole 11a for mounting to the wheel hub.

Therefore, in this disc rotor 10, the sliding plate portion 12 is divided into four equal parts in the circumferential direction, and a pair of two portions facing each other, namely a first portion 12a and a third portion 12c, are divided into four equal parts in the circumferential direction. There are many fins 13 at equal intervals and with equal thickness inside the
A, 13c, a large number of ventilation holes 1 of equal length and equally spaced
4a and 14c are provided radially, and the other pair of parts facing each other, that is, the second part 1
2b and the fourth portion 12d have walls of equal thickness. As a result, in the disc rotor 10, the first portion 12a and the third portion of the sliding plate portion 12 are
The portion 12c is formed like a ventilated disk rotor, and both portions 12c are formed like a ventilated disk rotor.
The mass and rigidity distributions in a and 12c are mutually uniform in the circumferential direction. In addition, the second portion 12b
The fourth portion 12d is formed like a solid disk rotor, and both portions 12d are formed like a solid disk rotor.
The mass and rigidity distribution in b and 12d are also uniform in the circumferential direction, and the first part 12a and the third part 12c have smaller mass and rigidity than the second part 12b and the fourth part 12d. . For this reason, the disc rotor 10 has strong directionality, and in particular, the area in which mass and rigidity are unevenly distributed in the circumferential direction of the sliding plate portion 12 is extremely large. The structure is designed to overcome the apparent increase in Therefore, the rotation of the disc rotor 10 causes the state of the vibration system consisting of the caliper, pad, disc rotor, etc. to change periodically, so that no steady vibration mode is formed on the disc rotor 10. As a result, all steady vibration modes can be prevented from occurring, and brake squeal caused by these modes can be prevented from occurring.

3 and 4 show a second embodiment of the disc rotor according to the present invention. In this disc rotor 20, only the first portion 22a and the third portion 22c of the sliding plate portion 22 have slits 23a, 23 along the entire outer periphery thereof.
c is formed. Both of these slits 23a,
23c is formed to have equal width, equal depth, and equal length, and the mass and rigidity distribution in the first portion 22a and the third portion 22c are mutually uniform in the circumferential direction. Further, the second portion 22b and the fourth portion 22d of the sliding plate portion 22 are formed with walls of equal thickness, and the mass and rigidity distribution in both portions 22b and 22d are also uniform in the circumferential direction. It's getting old. As a result, in the disc rotor 20, the first portion 22a and the third portion 22c are
Compared to the portion 22b and the fourth portion 22d, both the mass and rigidity are small and have strong directionality, and the area where the mass and rigidity are unevenly distributed is large, and the same effects as the disk rotor 10 of the first embodiment are achieved.

FIG. 5 shows a third embodiment of the disc rotor according to the present invention. This disk rotor 3
0, the first portion 3 in the sliding plate portion 32
A large number of narrow fins 33a, 33c of equal thickness and a large number of equally spaced wide ventilation holes 34a, 34c are provided radially inside the first part 32a and the third part 32c. The mass and stiffness distribution in the portion 32c are mutually uniform in the circumferential direction. Furthermore, inside the second portion 32b and the fourth portion 32d, wide fins 33b, 33d of equal thickness and narrow ventilation holes 34 are provided at equal intervals.
b, 34d are provided in large numbers radially, and the second
The mass and rigidity distributions in the portion 32b and the fourth portion 32d are mutually uniform in the circumferential direction. As a result, in the disk rotor 30,
The first portion 32a and the third portion 32c are the second portion 3
Compared to the disk rotor 2b and the fourth portion 32d, both the mass and the rigidity are small and have strong directionality, and the area where the mass and rigidity are unevenly distributed is large, and the same effect as the disk rotor 10 of the first embodiment is achieved.

Note that other configurations in the second and third embodiments are the same as in the first embodiment, so similar components in the 20s and 30s will be designated with similar numbers and detailed explanations will be given. Omitted.

In each of the embodiments described above, an example was shown in which the mass and rigidity of the first and third parts of the sliding plate were smaller than those of the second and fourth parts, but in the present invention, It is also possible to form the first and third parts and the second and fourth parts to differ in either mass or stiffness.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the disc rotor according to the present invention, FIG. 1 is a sectional view taken along the line - in FIG. 2, and FIG. 2 is a sectional view taken along the - line in FIG.
3 and 4 show the second embodiment of the disk rotor, and FIG. 3 shows the fourth embodiment.
4 is a sectional view taken along the - line in FIG. 3, and FIG. 5 is a sectional view corresponding to FIGS. 1 and 3 showing a third embodiment of the disk rotor. It is. Explanation of symbols, 10, 20, 30... Disc rotor, 11, 21, 31... Mounting flange part, 1
2, 22, 32...Sliding plate part, 12a, 22a,
32a...first part, 12b, 22b, 32b...
...Second part, 12c, 22c, 32c...Third part, 12d, 22d, 32d...Fourth part, 13
a, 13c, 33a-33d...cooling fin, 2
3a, 23c...slit.

Claims (1)

[Scope of utility model registration request] In a disc rotor for a disc brake, which is provided with an annular sliding plate part which is clamped by a pair of brake pads on the outer periphery of a flange part for attachment to a wheel hub, the sliding plate part is divided into four equal parts in the circumferential direction. , of each of these parts, the mass and rigidity distribution in the circumferential direction of the pair of two parts facing each other are made uniform, and the mass in the circumferential direction of the other pair of two parts facing each other is made uniform. and a disc rotor for a disc brake, characterized in that the rigidity distribution is uniform, and the masses or rigidities of the two pairs are different from each other.