JPH08109935A - Shim for disk pad and its manufacture - Google Patents

Abstract

PURPOSE: To provide a shim for a disk pad excellent in the vibration control effect, the judder noise preventing effect and the heat resistance. CONSTITUTION: In a shim for a disk pad, a covered layer consisting of fiber reinforced polyamideimide resin is formed on the surface of a metallic sheet. After polyamideimide resin mixed with the fiber is applied to the surface of the metallic sheet, the sheet is heated at 130-200 deg.C. The polyamideimide resin becomes excellent in the heat resistance and the strength at high temperature, and the covered layer of higher strength and capable of elastic deformation is formed by the mixture of the fiber. The covered layer consisting of the fiber reinforced polyamideimide resin is excellent in the heat resistance, and the vibration isolating effect is remarkably high without generating cracks, etc., even in the use at high temperature. The shim is useful for preventing the judder noise of the brake pad, and sufficiently demonstrates the effect for the braking at low or high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk pad shim material and a method for manufacturing the same, and more particularly to a disk pad shim material having excellent vibration damping effect and heat resistance, which is suitable for friction brake materials for automobiles. Regarding the method.

[0002]

2. Description of the Related Art A shim material is one member of a device having a friction mechanism used as an accessory to brake materials for machines, household appliances, automobiles, etc. It plays a role as a cushioning material that does not transmit vibrations directly to the pressure piston.

Conventionally, a shim material for a brake pad for an automobile is generally made of a thin metal plate.
This shim material is usually about 0.2 to 0.5 mm thick and is made of an inexpensive iron-based material in terms of price, and is generally manufactured by stamping a rustproof iron plate. .

[0004]

With the above-mentioned conventional shim material, the anti-vibration effect is low, and a large vibration when the brake pad acts is transmitted to the pressurizing piston or the caliper body.
This has been a cause of squeal and noise. In order to eliminate this cause, it has been attempted to apply a coating material to the surface of the thin plate or to interpose a rubber plate for vibration isolation, but a sufficient improvement effect has not been obtained.

In addition, the brake pad is 500
This heat reaches a temperature as high as ℃ or more, and this heat moves to the caliper through the pad. At that time, the conventional shim material having low heat resistance has a poor hot vibration damping effect.

Under the circumstances, there has been a strong demand for a shim material which gives heat resistance to a conventional shim material and has a sufficiently high vibration damping effect.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to provide a shim material for a disk pad, which is excellent in vibration damping effect, squeal preventing effect and heat resistance, and a manufacturing method thereof.

[0008]

A disk pad shim material according to a first aspect of the present invention is characterized in that a coating layer made of fiber-reinforced polyamide-imide resin is formed on the surface of a thin metal plate.

A disk pad shim material according to a second aspect is the fiber material in the coating layer according to the first aspect, wherein the fibers are one or more selected from the group consisting of carbon fibers, glass fibers and aramid fibers. Is 3 to 10% by volume.

A method for manufacturing a shim material for a disk pad according to claim 3 is a method for manufacturing a shim material for a disk pad according to claim 1 or 2, wherein a polyamide-imide resin mixed with fibers is applied to the surface of the thin metal plate. After that, 130-200 ℃
It is characterized by heating at.

The present invention will be described in detail below.

As described above, the requirements for the shim material are heat resistance and vibration resistance, but in the present invention, heat resistance is ensured by using a polyamide-imide resin, which is a highly heat resistant material. The vibrating property is achieved by forming a high-strength coating layer capable of elastic deformation on the surface of the metal thin plate by using a polyamide-imide resin mixed with fibers.

In the present invention, as the reinforcing fibers to be blended with the polyamide-imide resin, inorganic fibers such as carbon fibers and glass fibers, and heat resistant organic fibers such as aramid fibers can be used. The blending ratio of the reinforcing fibers in the coating layer is not sufficient, and if the amount is too large, the proportion of the polyamide-imide resin is relatively reduced and the moldability is impaired.
Volume% is preferable.

Particularly, in the present invention, an excellent addition effect can be obtained by adding 5 to 10% by volume for carbon fiber or glass fiber and 3 to 8% by volume for aramid fiber.

The fibers used have an average fiber diameter of 10 to 5
The average fiber length is preferably 0 μm and 1 to 10 mm.

Since these fibers are entangled with each other and mixed with the polyamideimide resin with good dispersibility, a coating layer having high strength and capable of elastic deformation can be formed by blending these fibers.

The thickness of the coating layer made of such a fiber-reinforced polyamide-imide resin is not preferable if it is too thin or too thick, and it is generally preferable to set it to about 30 to 300 μm. If this thickness is less than 30 μm, sufficient elastic deformation cannot be obtained, and the vibration damping effect is insufficient. If the thickness exceeds 300 μm, the thickness of the coating layer is too large and the strength of the coating layer becomes a problem. From the viewpoint of strength and elastic deformation, the coating layer is 50 to 20 in particular.
A thickness of 0 μm is preferred.

As the metal thin plate, an iron-based thin plate having a thickness of about 0.1 to 1 mm is usually used.

In order to manufacture such a shim material for a disk pad of the present invention, a polyamideimide resin is mixed with a predetermined amount of fibers, and this is uniformly applied to both front and back surfaces of a thin metal plate by a spraying method or a dipping method. And then
The resin may be cured by heating at 130 to 200 ° C. for about 30 to 60 minutes to form a coating layer having a predetermined thickness.

[0020]

The polyamide-imide resin has excellent heat resistance and high-temperature strength, and when it is mixed with fibers, it forms a coating layer having higher strength and elastic deformation. Therefore, the coating layer made of the fiber-reinforced polyamide-imide resin has excellent high heat resistance, does not generate cracks even when used at high temperatures, and has a significantly high effect of suppressing vibration. For this reason,
It helps prevent the brake pads from squeaking, and can exert its effect even at low and high speed braking.

[0021]

EXAMPLES The present invention will be described more specifically with reference to Examples and Comparative Examples below.

Examples 1 to 3 On both front and back surfaces of an iron-based thin plate (thickness: 0.2 mm), polyamide imide resin was added and mixed with reinforcing fibers at a ratio shown in Table 1, and the mixture was applied by spraying. 60
The coating layer of the fiber-reinforced polyamide-imide resin having the thickness shown in Table 1 was formed by heating for 5 minutes to solidify.

Using the obtained shim material, the presence or absence of vibration and squeal was examined by a dynamometer and an automobile test.
The results are shown in Table 1.

The fiber diameter and fiber length of the reinforcing fibers used are as follows.

Carbon fiber: average fiber diameter 10 μm, average fiber length 3 mm Glass fiber: average fiber diameter 10 μm, average fiber length 3 m
m Aramid fiber: average fiber diameter 20 μm, average fiber length 5 m
m Comparative Example 1 With respect to the conventional shim material made of an iron-based thin plate, the presence or absence of vibration and squeaking was examined in the same manner as in Example 1, and the results are shown in Table 1.

[0026]

[Table 1]

From Table 1, it is clear that the shim material for a disk pad of the present invention is extremely effective for vibration proof and squeal prevention.

[0028]

As described above in detail, the shim material for a disc pad of the present invention has a high vibration damping effect and a squeal preventing effect, and is excellent in heat resistance. The effect of does not change at all at the time of cold, and exhibits excellent performance.

According to the method for manufacturing a disc pad shim material of the present invention, such a disc pad shim material of the present invention can be easily and effectively manufactured.

Claims (3)

[Claims] 1. A shim material for a disk pad, wherein a coating layer made of fiber-reinforced polyamide-imide resin is formed on the surface of a thin metal plate. 2. The fiber according to claim 1, wherein the fiber is one or more selected from the group consisting of carbon fiber, glass fiber and aramid fiber, and the ratio of the fiber in the coating layer is 3 or more.
A shim material for a disk pad, which is characterized by being 10 to 10% by volume. 3. A method for manufacturing a shim material for a disk pad according to claim 1 or 2, wherein a polyamide-imide resin mixed with fibers is applied to the surface of the metal thin plate, and then 130-2.
A method for manufacturing a disc pad shim material, which comprises heating at 00 ° C.