JPH06117465A - Carbon fiber reinforced carbon composite material brake pad - Google Patents

Abstract

(57) [Summary] [Object] To provide a brake pad capable of preventing vibration (judder) of a pad caused by wear of the disc when the disc and the pad are made of carbon fiber reinforced carbon material. [Structure] It is made of carbon fiber reinforced carbon composite material, and the angle formed by the pad friction surface 3 and the side surface is more than 90 degrees. That is,
The cross-sectional area of the pad 1 (contact area with the disk 2) increases with wear, and the edge of the disk friction surface is shaped so that it does not grip the edge of the pad friction surface during wear, which causes judder. Prevent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake pad shape made of a carbon fiber reinforced carbon composite material for preventing vibration of the pad generated during braking.

[0002]

2. Description of the Related Art In a disc brake of a competition automobile or the like, which requires a high rotational speed and a high load, a carbon fiber reinforced carbon composite material is often used for both the disc and the pad. As shown in FIG. 2 (A), the shape of a brake pad conventionally used is such that the angle formed by the pad friction surface and the side surface connected thereto is approximately 90 degrees, that is, from the friction surface 3 to the opposite support. It had a substantially constant cross-sectional area toward the surface 4.

[0003]

However, when the pads 1 and the disk 2 are made of the same material as described above, not only the pad but also the disk 2 is worn by the use. As described above, when a pad whose angle formed by the friction surface and the side surface is approximately 90 degrees is used, wear occurs in a shape in which the disc grips the pad as shown in FIG. 2 (B). That is, when viewed in cross section, the center portion of the disc friction surface is dented, and both ends thereof are worn in a thick I shape. When used in such a worn condition, irregular friction occurs between the peripheral edge of the pad friction surface and both ends of the disc friction surface, causing pad vibration (judder).
There was a problem that occurs.

The present invention has been made under such a technical background, and an object thereof is to provide a brake pad capable of preventing vibration of the pad caused by wear of the disc.

[0005]

In order to achieve the above object, the pad of the present invention is made of carbon fiber reinforced carbon composite material, and the angle between the pad friction surface and the side surface is more than 90 degrees. It is a feature. Further, the present invention is also characterized in that the disc and the pad are both made of a carbon fiber reinforced carbon composite material, and the disc brake using the pad as described above is used.

[0006]

As described above, by making the angle between the pad friction surface and the side surface more than 90 degrees, that is, by making the pad cross-sectional area (contact area with the disk) increase with wear, the pad It is possible to prevent contact between the peripheral edge of the friction surface and both ends of the disk friction surface, and suppress the vibration of the pad that occurs during braking.

At this time, the inclination of the side surface of the pad with respect to the friction surface must be appropriately selected according to the amount of wear. If this inclination is too large, the pad grips the disk during use and the effect of suppressing judder cannot be obtained. On the contrary, if it is too small, it is the same as the conventional example shown in FIG. 2, and the effect cannot be obtained. After all, it is desirable that the shape of the pad viewed from the side surface is determined by the wear rate of the disk and the pad and the usage condition.

[0008]

EXAMPLES Examples of the present invention will be described below. Figure 1
(A) is a diameter 280 made of carbon fiber reinforced carbon composite material.
2 shows a caliper portion of an opposed piston type brake in which a ventilated disc for a competitive automobile having a size of mm and a pad of the present invention made of the same material are combined, and portions common to FIG. As shown, the pad 1 has a friction surface 3
The side surface connected to this has an inclination of more than 90 degrees, and the cross-sectional area increases from the friction surface 3 toward the support surface 4.

A case where such a pad 1 is worn due to use is shown in FIG. As shown, pad 1,
The disc 2 is abraded, and the disc 2 is dented at the central portion of its friction surface and is abraded at both ends in a thick I-shape. On the other hand, the pad 1 also has its frictional surface retracted and its peripheral edge is rounded. Here, since the pad 1 is configured such that its cross-sectional area increases from the friction surface toward the support surface, the contact area with the disk increases with wear. Therefore, the disc does not grip the pad, and it is possible to prevent the pad from vibrating during braking.

(Test Example) A dynamo test was conducted by combining the above-mentioned pad and disk. Dynamo condition is 1
Around 10 km per hour of braking for a competition car from 300 km / h
Set to correspond to 0 km to decelerate in 2 seconds,
This braking was performed 50 times. The angle R of the side surface of the pad of the example with respect to the friction surface was 95 degrees. For comparison, the same test was conducted using disks having the same material and the same diameter and having the angle R of 90 degrees.

As a result, the pad of the embodiment did not vibrate until the end of 50 braking, but the pad of the comparative example vibrated from the 36th time, confirming the effectiveness of the present invention.

[0012]

As described above, according to the pad of the present invention, the vibration of the pad during braking can be prevented.
Further, the disc brake using such a pad can be effectively used for a competitive automobile requiring a high rotation speed and a high load.

[Brief description of drawings]

FIG. 1A is a schematic cross-sectional view showing a caliper and a disc of a brake of the present invention, and FIG. 1B is a cross-sectional view showing a state where a pad of the brake of FIG.

FIG. 2A is a sectional view showing a conventional brake pad, and FIG. 2B is a sectional view showing its worn state.

[Explanation of reference numerals] 1 pad 2 disk 3 friction surface 4 support surface 5 piston

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takatoshi Takemoto 1-1-1 Kunyokita, Itami City, Hyogo Prefecture Sumitomo Electric Industries Itami Works

Claims (2)

[Claims] 1. The angle formed by the pad friction surface and the side surface is 90.
Carbon fiber reinforced carbon composite material brake pad characterized by being over degree. 2. The disk and the pad are both made of carbon fiber reinforced carbon composite material, and the angle formed by the friction surface and the side surface is 90.
A disc brake characterized by using pads that are overpowering.