JP2001227571A - Disk rotor for disk brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk rotor to solve the problem of degradation of the strength and reduce the brake squeak in applying a brake. SOLUTION: The disk rotor 1 for a disk brake comprises a disk part 2 of a predetermined thickness having a disk-like sliding surface to obtain the braking force by pressing a brake pad thereagainst and a hat part 3 which is provided with a disk-like flange part 8 disposed centripetally on the disk part 2 and connected to a wheel hub of a vehicle and a cylindrical part 9 to connect the disk part 2 to the flange part 8, further comprises a mass damper 4 disposed at the predetermined position on a side end surface of the disk part 2 via a predetermined contact surface and a fixing member 5 to fix the mass damper 4 to the side end surface of the disk part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotor for a disk brake, and more particularly to a disk rotor for reducing brake squeal during braking.

[0002]

2. Description of the Related Art A conventional example of a disk rotor will be described with reference to the drawings. 5A and 5B show a disk rotor according to a conventional example, in which FIG. 5A is a plan view, and FIG.
It is sectional drawing between Z '. The disk rotor 101 is a component for braking the vehicle. Usually, the disk rotor 101 has a disk-shaped sliding surface 102 having a disk-shaped sliding surface 102 for pressing a brake pad 107 to obtain a braking force;
And a hat portion 106 having a disk-shaped flange portion 104 which is arranged centrally on the third portion and is connected to a wheel hub of the vehicle, and further has a cylindrical portion 105 which connects the disk portion 103 and the flange portion 104. Structure.

[0003] In a normal disk rotor, brake squeal is likely to occur during braking due to friction between a brake pad and a sliding surface. For this reason, special disk rotors that prevent brake squeal during braking have been devised (see JP-A-10-78064, JP-A-7-12151, etc.).

[0004]

SUMMARY OF THE INVENTION Japanese Patent Application Laid-Open No. H10-7806
In the disk rotor described in Japanese Patent Publication No. 4 (1994), the natural frequency of the annular sliding plate portion in the in-plane direction of the rotor and the natural frequency of the outer direction of the rotor are separated by frequency separation capable of suppressing coupled vibration therebetween. In addition, the bending stiffness of the annular sliding plate portion is adjusted by adjusting the plate thickness and the rib formed in the bench hole of the ventilated rotor to prevent brake squeal during braking. In such a case, the rigidity of the rotor constantly changes due to external factors such as friction with the brake pad and corrosion of the members, so that it is difficult to maintain desired characteristics. Therefore, the prevention of brake squeal is only temporary. Further, since no means is provided for damping vibrations (perpendicular or in-plane vibrations) of the annular sliding plate portion, it is difficult to prevent brake squeal in actual use.

In the brake disk described in Japanese Patent Application Laid-Open No. 7-12151, the vertical wall is provided with a rigidity reducing portion for reducing the rigidity of the vertical wall, and the vibration mode is changed to reduce brake squeal. It is intended. In the case of such a structure, the strength of the brake disc also decreases, so that when the vehicle is braked, the rotational force is transmitted to the brake disc while changing, and the brake disc may be damaged. Further, when the rigidity reduction portion of the vertical wall portion is reduced in order to avoid a decrease in the strength of the brake disk, there is a problem that the change of the vibration mode is reduced and the brake squeak reduction effect is weakened.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk rotor for a disk brake which solves a decrease in strength and reduces brake squeal during braking.

[0007]

According to a first aspect of the present invention, there is provided a disk portion having a predetermined thickness provided with a disk-shaped sliding surface for obtaining a braking force by pressing a brake pad; A disk brake disk rotor, comprising a disk-shaped flange portion that is arranged and connected to a wheel hub of a vehicle, and a hat portion that includes a cylindrical portion that connects the disk portion and the flange portion. It has a mass damper arranged at a predetermined position on the side end surface of the disk portion via a predetermined contact surface, and a fixing member for fixing the mass damper to the side end surface of the disk portion.

According to a second aspect of the present invention, there is provided a disk portion having a predetermined thickness provided with a disk-shaped sliding surface for obtaining a braking force by pressing a brake pad; A disk brake disk rotor comprising: a disk-shaped flange portion connected to a wheel hub; and a hat portion having a cylindrical portion connecting the disk portion and the flange portion. A notch having a predetermined size from its surface at a predetermined position, a mass damper disposed at a predetermined position of the notch via a predetermined contact surface, and fixing the mass damper to the notch. And a member.

Further, in the disk rotor for a disk brake, it is preferable that the mass damper and the fixing member are arranged at positions equally dividing a periphery of a side end surface of the disk portion.

In the disk rotor for a disk brake, it is preferable that the fixing member is a bolt, and the side end surface of the disk portion or the notch has a hole for a bolt to be screwed with the bolt. .

Here, the following can be considered as causes of brake squeal.

Referring to FIG. 5, the mechanism of brake squeal is that the sliding surface 102 and the brake pad 10
When the discs 7 come into contact with each other, the disk portion 103 becomes dense and thick before the pressure contact portion with the brake pad 107 during rotation, and the member changes from the dense state to the sparse state at the pressure contact portion of the brake pad 107 during rotation. , Brake pad 1
The portion passing through the pressure contact portion with 07 is sparse and thin. A slight vibration is generated by the release of energy when the member changes from a dense state to a sparse state, and when the vibration resonates and amplifies, the disk rotor 101 plays the role of a speaker to shake air and brake noise. It is believed that sound is generated.

As will be described later in the process leading up to the present invention, it is clear that a complicated vibration is generated at the time of pressing and sliding contact with the sliding surface of the brake pad, and the effective elimination of the brake squeal can be achieved by the conventional method. Is still incomplete and difficult to completely resolve.

According to the inventor's knowledge, FIG.
As the disk rotor 101 has a function, the sliding surface 102 has a disk shape and the hat portion 106 has a cylindrical portion 105, so that the disk surface 101 has a vibration mode unique to the disk shape, In-plane vibration specific to the shape always exists. The plane-to-plane vibration is a vibration generated in the direction perpendicular to the sliding surface 102 (in the axle direction). The in-plane vibration is a vibration in which the disk portion 103 vibrates in the circumferential direction (rotation direction) and the sliding surface 102 and the cylindrical portion 105 are generated in the radial direction in synchronization with the vibration. The disk rotor 101 vibrates during braking by these two types of vibration modes.
Although these two vibration modes are different from each other in vibration mode, it is considered that the disk rotor 101 generates a brake squeal sound when the air is shaken by these two vibration modes. According to the above aspects of the present invention, brake squeal caused by such complicated vibration can be effectively reduced or eliminated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk part having a predetermined thickness provided with a disk-shaped sliding surface for obtaining a braking force by pressing a brake pad, and disposed centrally on the disk part and connected to a wheel hub of a vehicle. A hat portion having a disk-shaped flange portion and a cylindrical portion connecting the disk portion and the flange portion, a disk rotor for a disk brake, wherein the disk portion has a predetermined position on a side end surface of the disk portion. Contact damping at the contact surface between the side end surface of the disk portion and the surface of the mass damper by having a mass damper disposed via the contact surface of the disk portion and a fixing member for fixing the mass damper to the side end surface of the disk portion. Thereby, the vibration of the rotor can be damped (controlled), and the brake squeal can be reduced.

[0016]

Embodiments of the present invention will be described with reference to the drawings. 1A and 1B show a disk rotor for a disk brake according to a first embodiment of the present invention, wherein FIG. 1A is a plan view, and FIG.
It is the side view seen from the direction. This is disk rotor 1
A bolt hole 7 is made at a predetermined position on the outer peripheral end surface of the disk portion 2 in FIG.

The disk rotor 1 is of a solid type, and includes a disk portion 2, a hat portion 3, a mass damper 4,
And a bolt 5. The disk part 2 has a disk-shaped sliding surface 6 which presses a brake pad to obtain a braking force.
And a bolt hole 7 to be screwed with the bolt 5 at a predetermined position on the outer peripheral side end face. Hat part 3
Is provided with a disk-shaped flange portion 8 which is disposed centrally on the disk portion 2 and is connected to a wheel hub of a vehicle, and has a cylindrical portion 9 which connects the disk portion 2 and the flange portion 8. The mass damper 4 is a member for reducing the amplitude of the vibration, and is disposed at a predetermined position on the side end surface of the disk unit 2 via a predetermined contact surface (see the contact unit 10). The bolt 5 is a member for fixing the mass damper 4 to the disk unit 2 and is screwed with the bolt hole 7.

In the disk rotor having the mass damper as in the first embodiment, the vibration of the disk rotor can be attenuated (absorbed) by the contact between the mass damper and the disk portion of the disk rotor, and as a result, brake squeal is suppressed. It is possible. Further, since no notches are provided in the cylindrical portion or the flange portion of the hat portion of the disk rotor, there is no reduction in strength.

Next, another embodiment of the present invention will be described with reference to the drawings. 2A and 2B show a disk rotor for a disk brake according to a second embodiment of the present invention. FIG. 2A is a plan view, and FIG. 2B is a side view as viewed from the Y direction. In this embodiment, a notch 11 is provided at a predetermined position on the outer peripheral end surface of the disk portion 2 of the disk rotor 1, and the mass damper 4 is fixed to the notch 11 with a bolt 5.

The disk rotor 1 is of a solid type, and includes a disk portion 2, a hat portion 3, a mass damper 4,
And a bolt 5. The disk part 2 has a disk-shaped sliding surface 6 which presses a brake pad to obtain a braking force.
Having a notch 11 of a predetermined size from the surface at a predetermined position on the outer peripheral end face,
The notch 11 has a bolt hole 7 at a predetermined position to be screwed with the bolt 5. The hat portion 3 includes a disc-shaped flange portion 8 which is disposed centrally on the disc portion 2 and is connected to a wheel hub of a vehicle, and has a cylindrical portion 9 which connects the disc portion 2 and the flange portion 8. Prepare. The mass damper 4 is a member for reducing the amplitude of vibration,
It is arranged at a predetermined position on the side end surface of the notch 11 via a predetermined contact surface (see the contact portion 10). Bolt 5
The mass damper 4 is a member for fixing the mass damper 4 to the disk portion 2 and is screwed with the bolt hole 7.

By adopting the shape as in the second embodiment, it is possible to cope with a case where there is no space between the outer peripheral end face of the disk portion and the caliper, and the contact area between the mass damper and the notch portion is increased so that the damping is achieved. It can be effective.

Next, other details will be described.

The material used for the mass damper may be a metal such as iron or copper, a resin such as rubber, or various materials.
In particular, when a corrosion-resistant material such as stainless steel is used as the material of the mass damper, the durability and reliability are further improved. Mass damper fixing means are rivets,
A caulking tool, pinning, press fitting, etc. may be used. The mass damper may be partially welded.

The disk rotor is not limited to a solid type, but may be a ventilated type. Also, cast iron or an aluminum alloy may be used as the material of the disk rotor, and the material is not particularly limited.

The clearance between the mass damper and the disk rotor has a gap to some extent in order to attenuate (control) the vibration. However, the clearance must be small enough to prevent rattling. Must be set individually. Preferably, the clearance is close enough to cause a sufficient degree of vibration damping or a predetermined change in the natural frequency to prevent brake squeal.

When a plurality of mass dampers and bolts are respectively used, the mass dampers and bolts are equally divided around the side end surface of the disk portion (for example, when two mass dampers are mounted, the opposing position on the outer periphery is used, and in the case where three mass dampers are installed, the outer periphery is divided by 3). By arranging them at equally divided positions, rotational balance can be obtained.

Next, a description will be given of a test comparing the brake squeal state between the embodiment of the present invention and the conventional example. A brake squeal test was performed for each of the in-plane vibration and the in-plane vibration of the disk rotor. The natural frequency of each vibration at which brake squeal occurred, that is, 4.6 kHz and 5.5 kHz were measured for the in-plane vibration, and 8.4 kHz was measured for the in-plane vibration. The level at which it is determined that brake squeal has occurred is 60 dB or more.

Here, the embodiment is the disk rotor according to the first and second embodiments (see FIGS. 1 and 2), whereas the conventional example is a mass damper, a notch, a bolt and a bolt. This is a normal disk rotor without holes (see FIG. 5). These are all solid types. Each of the disk rotors had a diameter of 15 inches, a diameter of the flange portion of 182 mm, a width of 269 mm, and a height of the cylindrical portion of 55.
5 mm, the material is cast iron. Mass damper is size φ1
The size is 0 × 10 mm, the weight is 45 g, the material is iron, and the number of attachments is one. The bolt is M5 × P0.8 and 30 mm in length.

The conditions are braking from a speed of 35 km / h, a temperature of 50 to 95 ° C. (a position 0.5 mm from the pad surface), and a deceleration of 0.1 G. The measuring frequency is between 500 and 15000 Hz. The used brake pad is a relatively high friction material having an average friction coefficient μ of about 0.5.

The evaluation results of the brake squeal test are shown in FIGS. FIG. 3 is an evaluation result of a brake squeal test of the disk rotors according to the first and second embodiments of the present invention and the disk rotor according to the conventional example due to plane vibration. FIG. 4 is an evaluation result of a brake squeal test by in-plane vibration of the disk rotors according to the first and second embodiments of the present invention and the disk rotor according to the related art.

In the embodiment, as compared with the conventional example, the rate of occurrence of brake squeal due to surface vertical vibration was remarkably low. On the other hand, the rate of occurrence of brake squeal due to in-plane vibration was less than half of the conventional example.

[0032]

According to the present invention, the contact attenuation at the contact surface between the side end surface of the disk portion and the surface of the mass damper allows
The vibration of the rotor can be damped (controlled), and the brake squeal can be significantly reduced. In addition, since the cylindrical portion or the flange portion of the hat portion of the disk rotor is not processed to reduce rigidity, brake squeal can be reduced while maintaining the conventional strength.

Further, according to the present invention, since the contact area between the mass damper and the disk portion or the notch portion can be increased, the damping effect can be further improved, and the brake noise can be further reduced.

[Brief description of the drawings]

FIG. 1 is a disk rotor according to a first embodiment of the present invention, in which (a) is a plan view and (b) is a side view as viewed from an X direction.

FIGS. 2A and 2B show a disk rotor according to a second embodiment of the present invention, wherein FIG. 2A is a plan view and FIG. 2B is a side view seen from a Y direction.

FIG. 3 shows an evaluation result of a brake squeal test of the disk rotors according to Examples 1 and 2 of the present invention and a disk rotor according to a conventional example due to a plane vibration.

FIG. 4 shows evaluation results of a brake squeal test by in-plane vibration of the disk rotors according to the first and second embodiments of the present invention and the disk rotor according to the conventional example.

FIG. 5 is a conventional example of a disk rotor,
(A) is a plan view, and (b) is a ZZ ′ plane cross-sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disk rotor 2 Disk part 3 Hat part 4 Mass damper 5 Bolt 6 Sliding surface 7 Bolt hole 8 Flange part 9 Cylindrical part 10 Contact part 11 Notch 101 Disk rotor 102 Sliding surface 103 Disk part 104 Flange part 105 Cylindrical shape Part 106 hat part 107 brake pad

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hideyuki Kai 1-tenno, Takaokashinmachi, Toyota-shi, Aichi Prefecture Aisin Takaoka Co., Ltd. F-term (reference) 3J048 AA06 BF07 EA26 3J058 BA21 BA23 CB22 CB30 DD02

Claims (5)

[Claims] 1. A disk part having a predetermined thickness provided with a disk-shaped sliding surface for obtaining a braking force by pressing a brake pad, and a disk-shaped part which is arranged centrally on the disk part and is connected to a wheel hub of a vehicle. And a hat portion having a cylindrical portion connecting the disk portion and the flange portion. A disk rotor for a disk brake, comprising: a predetermined contact on a predetermined position on a side end surface of the disk portion; A disk rotor for a disk brake, comprising: a mass damper disposed via a surface; and a fixing member that fixes the mass damper to a side end surface of the disk portion. 2. A disk portion having a predetermined thickness provided with a disk-shaped sliding surface for obtaining a braking force by pressing a brake pad, and a disk-shaped portion which is disposed centrally on the disk portion and is connected to a wheel hub of a vehicle. And a hat portion having a cylindrical portion connecting the disk portion and the flange portion. A disk rotor for a disk brake, comprising: A notch portion having a size of, and a mass damper disposed at a predetermined position of the notch portion via a predetermined contact surface; and a fixing member for fixing the mass damper to the notch portion. Disc rotor for disc brakes. 3. The disk rotor for a disk brake according to claim 1, wherein said mass damper and said fixing member are arranged at positions equally dividing the periphery of a side end surface of said disk portion. 4. The fixing member is a bolt, the mass damper has a hole through which the bolt is inserted, and a side end surface of the disk portion or the notch is a bolt screwed with the bolt. The disc rotor for a disc brake according to any one of claims 1 to 3, wherein the disc rotor has a hole. 5. The fixing member is a rivet, the mass damper has a hole through which the rivet is inserted, and a side end face of the disk portion or the notch is used to press-fit the rivet. The disc rotor for a disc brake according to any one of claims 1 to 3, wherein the disc rotor has a hole.