JPH11311272A - Disc brake pad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce scattering of abrasion powder, to reduce a stain of a tire wheel to the possible minimum level, and to prevent environmental pollution by installing an abrasion powder adsorber on a friction member of a pad containing the friction member and a back plate. SOLUTION: When the part for installing an abrasion powder adsorber 3 on a friction member 1 is installed in a part or the whole periphery of the outer periphery in the same thickness as the friction member 1, abrasion powder of a pad can be efficiently adsorbed. An installing means is adhered to the pad side surface by an adhesive, or an adsorber 3 is hooked on the claw part of an installing pin so as to be easily installing/removed. A raw material of the adsorber 3 is formed as a mesh-like sheet by molding or working a fine fiber material so as to easily adsorb fine abrasion power, or is formed in a recessed/projecting porous structure having the fine surface. A construction material of the friction member 1 can be applied to both a semimetallic type or a nonsteel type, and steel fiber, acrylic fiber, phenol resin and epoxy resin can be cited as the raw material. Scattering of abrasion powder can be reduced by such constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake pad used for braking automobiles, railway vehicles, various industrial machines, and the like.

[0002]

2. Description of the Related Art Disc brakes are used as braking devices for automobiles, railway vehicles, various industrial machines, and the like, and disc brake pads are used as braking members. Currently used disc brake pads are
As shown in JP-A-6-184525 and the like,
The friction member is composed of a friction member and a backing metal, and the friction member is formed by mixing a binder, reinforcing fibers, a lubricant, a friction modifier, a filler, and the like.

A disc brake is a mechanism for braking by converting a frictional force generated when a disc brake pad is pressed against a disc rotor into thermal energy. Therefore, due to the mechanism of the disc brake, wear of the disc brake pad during braking is inevitable, and the abrasion powder generated by friction contaminates the tire wheel and scatters into the air, polluting the living environment of people. is there.

[0004]

According to the first aspect of the present invention, scattering of wear powder on a disc brake pad is reduced,
An object of the present invention is to provide a disc brake pad for minimizing dirt in a tire hole and contributing to prevention of environmental pollution. A second aspect of the present invention provides a disc brake pad according to the first aspect of the present invention, which efficiently reduces scattering of wear powder on the disc brake pad. The invention described in claim 3, 4 or 5 provides a disc brake pad which exhibits the effect of claim 1, has an excellent effect of adsorbing wear powder on the disc brake pad, and furthermore efficiently reduces the scattering of wear powder. It is.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a disc brake pad including a friction member and a backing metal, wherein the friction member is provided with a wear powder adsorbent. Further, the present invention relates to a disc brake pad in which a wear powder adsorbent is attached to a part or the entire outer periphery of a friction member. Further, the present invention relates to a disc brake pad in which the wear powder adsorbent has a porous structure. The present invention also relates to a disc brake pad in which the abrasion powder adsorbent has adhesiveness. Further, the present invention relates to a disc brake pad in which the wear powder adsorbent is a magnet.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, there is no particular limitation on a portion where a wear powder adsorbent is attached to a friction member, but it is the same thickness as the friction member, and it is preferably attached to a part or the entire outer periphery. It is preferable if the wear powder on the disc brake pad can be efficiently adsorbed. There is no particular limitation on the means for mounting the abrasion powder adsorbent, but the adhesive is attached to the side surface of the disc brake pad using an adhesive, or a mounting pin is provided so that it can be easily attached to and detached from the disc brake pad. It is preferable to use a device in which the wear powder adsorbent is hooked or adhered with an adhesive to the claw portion provided in the above, and the tip thereof is inserted into a pin hole provided in the friction member.

The material of the abrasion powder adsorber is not particularly limited as long as it can absorb the abrasion powder of the disc brake pad. For example, a fine fiber material is formed or processed so as to easily absorb the abrasion powder. To form a mesh-like sheet, or to use a porous structure with a finely uneven surface, epoxy-based adhesive, SB-based latex, NBR
It is preferable to use an adhesive material such as a latex or an acrylate latex, or to use a magnet or the like so that abrasion powder or the like of cast iron from which a disk rotor is shaved can be efficiently adsorbed. These may be used alone, but it is preferable to use them in combination because they have excellent adsorption effects.

The material of the friction member used for the disc brake pad of the present invention can be applied to any of a semi-metallic type and a non-steel type, and is not particularly limited. As the material of the friction member, generally known materials are used, for example, fibers such as steel fiber, brass fiber, copper fiber, acrylic fiber, aramid fiber, ceramic fiber, rock wool, potassium titanate fiber, and carbon fiber. Substances, binders such as phenolic resin, epoxy resin and melamine resin, NB
Rubber powders such as R, SBR, IR, etc., organic friction modifiers such as friction dust, inorganic friction modifiers such as antimony trisulfide, graphite, etc., inorganic fillers such as barium sulfate, calcium carbonate, magnesium carbonate, etc., if necessary Metal powder such as copper and brass is added.

The content of the fibrous substance in the above composition is preferably 30 to 50% by weight in the whole composition, and preferably 3 to 50% by weight.
More preferably, the content is 5 to 45% by weight. The content of the binder is preferably from 7 to 20% by weight, more preferably from 10 to 17% by weight, in the whole composition. The content of the rubber powder is preferably 2 to 13% by weight, more preferably 4 to 10% by weight in the whole composition. The organic friction modifier is preferably contained in the entire composition at 2 to 10% by weight, more preferably at 4 to 8% by weight. The inorganic friction modifier is preferably contained in the entire composition at 2 to 15% by weight, more preferably 5 to 10% by weight. The content of the inorganic filler is preferably 20 to 50% by weight, more preferably 30 to 40% by weight, based on the whole composition. The metal powder added as necessary is preferably contained in the entire composition in an amount of 1 to 5% by weight, and more preferably 2 to 4% by weight.
More preferably, it is contained. These components are blended so that the total composition becomes 100% by weight.

[0010] The disc brake pad according to the present invention comprises:
The friction material composition is preformed to a certain thickness, then the backing metal and the preformed body are inserted into a mold, and formed by heating and pressing at 130 to 180 ° C. and 30 to 70 MPa to form a friction member. And a backing metal. After molding, heat treatment is performed at a temperature of 200 to 300 ° C., and after cooling, the surface is polished. Is obtained by adhering (attaching) to a part or the whole of the outer periphery of. The portion where the wear powder adsorbent is adhered and fixed to the friction member does not need to be the entire wear powder adsorbent, but is about 1/5 of the thickness of the friction member from the portion in contact with the back metal toward the sliding side. It is preferable that

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1A is a plan view of a disc brake pad according to an embodiment of the present invention, and FIG.
2A is a plan view of a disk brake pad according to another embodiment of the present invention, FIG. 2B is a front view thereof, and FIG. 3A is a disk according to another embodiment of the present invention. FIG. 2B is a plan view of the brake pad, and FIG.
Is a friction member, 2 is a back metal, and 3 is a wear powder adsorbent.

[0012]

Embodiments of the present invention will be described below. Example 1 The components shown in Table 1 were blended, and a friction material composition uniformly mixed in a mixer was preformed. Then, a backing metal and a preform were inserted into a mold, and the temperature was 140 ± 5 ° C., and the pressure was 60 MPa. Was formed under heat and pressure for 10 minutes to integrate the friction member and the back metal. After the molding, a heat treatment was performed at 260 ° C. for 5 hours. After cooling, the surface was polished.

Next, as shown in FIGS. 1A and 1B, aramid fiber (manufactured by Dupont Toray Kevlar Co., Ltd.)
After processing Kevlar fiber) to obtain a knitted sheet having the same thickness as the friction member 1, acrylate-based latex is sprayed on the knitted sheet to obtain a wear powder adsorbent 3, An adhesive is applied in a width of 2 mm from the portion in contact with the back metal 2 toward the sliding side, and the abrasion powder adsorbent 3 is adhered (attached) while leaving the inner portion of the outer periphery of the friction member 1.
Disc brake pads were obtained.

Embodiment 2 As shown in FIGS. 2A and 2B, the wear powder adsorbent 3
A disk brake pad was obtained through the same steps as in Example 1 except that the mounting portion was made the side surface of the outer periphery of the friction member 1.

Embodiment 3 As shown in FIGS. 3A and 3B, the wear powder adsorbent 3
Example 1 was the same as Example 1 except that the mounting portion was the outer peripheral side surface of the friction member 1 and its length was set to about ２ of the side surface of the friction member 1.
Through the same steps as above, a disc brake pad was obtained.

Example 4 A disc brake pad was obtained through the same steps as in Example 1 except that a magnet was further sprayed on the abrasion powder adsorbent in Example 1.

Comparative Example 1 A disc brake pad was obtained through the same steps as in Example 1, except that the abrasion powder adsorbent was not mounted on the outer periphery of the friction member.

[0018]

[Table 1]

Next, the disc brake pads according to the present invention (Examples 1 to 4) and the disc brake pad of Comparative Example 1 were subjected to a dynamometer wear test according to JASO C402-79, and the disc brake pad wear amount and test were performed. A comparative test was performed on the amount of the absorbed wear powder, the amount of the scattered wear powder, and the contamination of the tire wheel. Table 2 shows the results.

In the above test, the disc brake pad abrasion amount, abrasion powder adsorption amount and abrasion powder scattering amount were evaluated with respect to the weight of the abrasion powder adsorbent alone and the abrasion powder adsorbent before and after the test. Measure the weight of only the disc brake pads that are not installed, determine the weight loss of the disc brake pads after the test as the disc brake pad wear, and the weight increase of the wear powder adsorbent after the test as the wear powder adsorption, The difference between the disc brake pad and the amount of abrasion powder adsorbed was defined as the amount of abrasion powder scattered. As for the disc brake pad of the comparative example, since the wear powder adsorbent was not mounted, the weight loss of the disc brake pad after the test was regarded as the disc brake pad wear amount, and the value was evaluated as the wear powder scattering amount.

Before the test, a 1 cm square double-sided tape was attached to the tire wheel before the test. After the test, the thickness of the particle layer of the abrasion powder adhering to the surface of the double-sided tape was measured using a scanning electron microscope. (SEM) to evaluate the stain. In the evaluation of dirt, a brake test was performed in an environmental tank so as not to cause tire wheel dirt due to a factor smaller than abrasion powder during the test.

[0022]

[Table 2]

As shown in Table 2, it is shown that the disc brake pad according to the present invention has less scattering of abrasion powder, a smaller particle layer of the abrasion powder, and less dirt on the tire wheel. On the other hand, the disc brake pad of the comparative example, which is not included in the present invention, shows that a large amount of wear powder is scattered, the thickness of the particle layer of the wear powder is large, and the tire wheel is largely contaminated.

[0024]

According to the first aspect of the present invention, the disc brake pad can reduce scattering of abrasion powder, minimize dirt on the tire wheel, and contribute to prevention of environmental pollution. The disc brake pad according to the second aspect can efficiently reduce the scattering of wear powder, in particular, among the disc brake pads according to the first aspect. Claim 3,
The disk brake pads according to the fourth and fifth aspects have the effects described in the first aspect, are excellent in the effect of adsorbing wear powder, and can efficiently reduce the scattering of wear powder.

[Brief description of the drawings]

FIG. 1A is a plan view of a disc brake pad according to an embodiment of the present invention, and FIG. 1B is a front view thereof.

FIG. 2A is a plan view of a disk brake pad according to another embodiment of the present invention, and FIG. 2B is a front view thereof.

FIG. 3A is a plan view of a disk brake pad according to another embodiment of the present invention, and FIG. 3B is a front view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Friction member 2 Back metal 3 Wear powder adsorbent

Claims (5)

[Claims] 1. A disc brake pad including a friction member and a back metal, wherein the friction member is provided with a wear powder adsorbent. 2. The disc brake pad according to claim 1, wherein the abrasion powder adsorbent is attached to a part or the entire periphery of the friction member. 3. The disc brake pad according to claim 1, wherein the wear powder adsorbent has a porous structure. 4. The disc brake pad according to claim 1, wherein the abrasion powder adsorbent has an adhesive property. 5. The method according to claim 1, wherein the wear powder adsorbent is a magnet.
The disc brake pad according to 2, 3, or 4.