JP2001234960A - Friction materials, pads, shoes - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a friction material in which the grinding material is prevented from collapsing. Another object of the present invention is to provide a pad and a shoe that can sufficiently retain a frictional force even when a friction material containing an abrasive having a relatively small particle diameter of several tens of μm or less is used. SOLUTION: A composite powder material is blended as a component of a resin material and a component of an abrasive in a component of a friction material. On the other hand, the particles 5 of the composite powder material are formed on the surface of the particles 3 of the resin material by the powder surface modifying means.
It is the one that typed. Therefore, in the composite powder material,
The abrasive is already strongly fixed to the resin material. Therefore, by including the composite powder material as a component of the resin material and a component of the abrasive in the components of the frictional material, the joining strength of the abrasive in the frictional material can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material used for pads, shoes and the like in brakes of automobiles and the like. The present invention also relates to a pad using a friction material in a brake of an automobile or the like. Further, the present invention relates to a shoe using a friction material in a brake of an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, for example, in a pad for a disk brake of a car or a shoe for a drum brake, a friction material used for the pad or the shoe is made of ceramic powder or the like in order to improve the frictional force of the pad or the shoe. Abrasive material is included.

[0003] In a pad or shoe manufacturing process, the abrasive is used as a component of another friction material (eg, a resin material, a fibrous base material, a friction adjusting material, a filler, etc.) before the friction material is hardened. Are mixed together in a predetermined weight ratio and are mixed in the mixer, and thus are statistically and uniformly dispersed as a whole together with the resin material, the fibrous base material, the friction adjusting material, the filler, and the like.

However, at this time, if a relatively large abrasive having a particle diameter of about several hundreds of μm is blended, the frictional force of the pad and the shoe can be improved, but the rotor and the drum are easily damaged and the brake is damaged. It is not preferable because it causes shudder.

[0005]

Therefore, from the viewpoint of preventing brake shudder and the like, it is considered desirable to mix an abrasive having relatively small particles having a particle diameter of several tens μm or less. If the particle size is small, the surface area of the abrasive will be small, so the bonding strength of the abrasive with the friction material will be weak, the abrasive will easily fall off from the friction material, and on the contrary, the frictional force of the pads and shoes will decrease. There was a problem.

Accordingly, the present invention has been made to solve the above-described problems, and has as its object to provide a friction material in which the grinding material is prevented from collapsing. It is another object of the present invention to provide a pad which can sufficiently retain a frictional force even when a friction material containing a relatively small particle abrasive having a particle size of several tens μm or less is used. Similarly, several tens μm
It is an object of the present invention to provide a shoe that can sufficiently retain a frictional force even when a friction material containing a relatively small particle abrasive having the following particle diameter is used.

[0007]

Means for Solving the Problems According to a first aspect of the present invention, there is provided a friction material containing a resin material and an abrasive material as constituents by a powder surface modifying means. A composite powder material in which a large number of particles of the abrasive are fixed to the surface of the particles of the resin is included as a component of the resin and a component of the abrasive.

According to a second aspect of the present invention, in the friction material according to the first aspect, the powder surface modifying means coats a large number of particles of the abrasive on the surface of the particles of the resin. It is characterized in that it is a process of repeatedly giving a mechanical action by colliding objects.

According to a third aspect of the present invention, in the friction material according to the first aspect, the powder surface modifying means includes a mixture of particles of the resin material and particles of the abrasive. It is characterized in that it is a process of repeatedly applying a mechanical action by rubbing.

According to a fourth aspect of the present invention, in the friction material according to the first aspect, the powder surface modifying means attaches a large number of particles of the abrasive to the surface of the particles of the resin material. This is a process of dispersing and supplying in a hot air stream and then cooling it with cold air.

According to a fifth aspect of the present invention, in the friction material according to any one of the first to fourth aspects,
The average particle diameter of the abrasive is 0.5 μm to 5 μm, and the average particle diameter of the resin material is 15 μm to 10 μm.
0 μm.

According to a sixth aspect of the present invention, there is provided a pad, wherein the friction material according to any one of the first to fifth aspects is used. According to a seventh aspect of the present invention, there is provided a shoe, wherein the friction material according to any one of the first to fifth aspects is used.
It is characterized by.

In the friction material of the present invention having such characteristics, as a component of the resin material and a component of the grinding material, a large number of particles of the grinding material are driven into the surface of the particles of the resin material by a powder surface modifying means. Alternatively, the composite powder material in which the abrasive is already strongly fixed to the resin material is blended at the particle level by fusing. Therefore, unlike the prior art, before the friction material is baked and hardened, the abrasive is already strongly fixed to the resin material, so that the joining strength of the abrasive with the friction material can be increased.

[0014] The powder surface modifying means includes a process of repeatedly applying a mechanical action by colliding a surface of resin particles with a large number of abrasive particles, and grinding the resin particles. There is a process of rubbing the mixture of the particles of the material with each other and repeatedly giving a mechanical action. These can be realized, for example, by using a mixer capable of repeatedly applying a mechanical action such as friction, impact, shear, and compression. Further, as another powder surface modifying means, there is a process of dispersing and supplying a large number of abrasive particles to the surface of resin material particles in a hot air stream, and then cooling with cold air.

That is, in the friction material of the present invention, a composite powder material is contained as a component of the resin material and a component of the abrasive material in the constituent components. By the reforming means, a large number of particles of the abrasive are driven into or fused with the surface of the particles of the resin material, and at the particle level, the abrasive is already strongly fixed to the resin material. Therefore, it can be said that the friction material of the present invention suppresses the grinding material from collapsing.

Therefore, in the friction material of the present invention, even if the abrasive has a relatively small particle size of several tens μm or less, it is possible to prevent the abrasive from collapsing.

From the viewpoint of suppressing the grinding material from collapsing, not only the composite powder material is blended but also the resin material component and the grinding material as all of the resin material component and the grinding material component. May be compounded as a part of the component.

In the friction material of the present invention, when the average particle diameter of the abrasive is 0.5 μm to 5 μm, a sufficient porosity as the friction material can be sufficiently ensured, and at the same time, the resin material When the average diameter of the particles is from 15 μm to 100 μm, it is possible to fix a large number of particles of the abrasive on the surface of the particles of the resin material and sufficiently secure a uniform dispersion state of each component in the friction material. Therefore, the performance as a friction material can be sufficiently exhibited.

Therefore, even if a friction material containing a relatively small particle abrasive having a particle size of several tens of μm or less is used to prevent a brake shudder or the like in a pad or a shoe, the friction material of the present invention may be used. In the case of the pad or the shoe using the friction material, since the grinding material is suppressed from falling down from the friction material, the friction force can be sufficiently held.

Further, in the pad or shoe using the friction material of the present invention, since the grinding material is suppressed from falling from the friction material, the brake braking which occurs when the grinding material falls from the friction material is performed. This eliminates unstable performance and brake squeal, and relieves the driver of discomfort caused by such situations.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a manufacturing process of the pad of the present embodiment. In order to manufacture the pad 2 of the present embodiment, first, the composite powder material 12, the fibrous base material 13, the friction modifier 14 and the filler 15 are charged into the mixer 21 based on the table of FIG. Then, the mixture 17 is statistically uniformly dispersed as a whole. However, composite powder material 1
2 is made from the resin material and the abrasive in the weight ratio of FIG. 2 by the powder surface modifying means described later.

On the other hand, an adhesive is applied to the back metal 16 by a spray gun 22. And the preforming mold 2
The mixture 17 and the back metal 16 are set to 3, and heat molding is performed while applying pressure with a punch 24, and then a thermoforming treatment is performed in a furnace 25 to be cured. As a result, the mixture 17 becomes the friction material 1 and the friction material 1
Is manufactured. Then, pad 2
Is processed into a desired shape by a cutter 26 or the like, and is subjected to a coating process by a spray gun 27 and a polishing process to be a product.

Next, in the step of manufacturing the pad 2 shown in FIG. 4, the powder surface modifying means for producing the composite powder material 12 to be fed into the mixer 21 will be described. FIG. 5 is a diagram showing a flow of the powder surface modifying device 30 corresponding to the powder surface modifying means. As shown in FIG. 5, the powder surface reforming apparatus 30 includes an ordered mixture forming machine 31, a metering / feeding machine 32, an immobilization processing machine 33, a collector 34, and a control device 35 for controlling them. The composite powder material 12 is formed from the resin material 10 and the abrasive material 11.

In order to form the composite powder material 12 from the resin material 10 and the grinding material 11, first, based on the weight ratio of FIG. To form a mixture of the particles of the resin material 10 and a large number of particles of the abrasive 11 (hereinafter referred to as “ordered mixture”). Next, a predetermined amount of “ordered mixture” is applied to the immobilization processor 33 via the metering device 32.

As shown in FIG. 6, the immobilization processor 33
High-speed rotating rotor 41, stator 42, circulation circuit 4
3 and the like, and the cooling and heating can be controlled by the jacket 48. Therefore, in the immobilization processing machine 33, the “ordered mixture” introduced into the machine from the introduction port 44 includes the rotor 41, the blades 47 provided around the rotor 41, the stator 42, the circulation circuit 4
By the action of 3, etc., it moves at a high speed as shown by the two-dot chain line in FIG. At this time, the “ordered mixture” is repeatedly subjected to mechanical actions such as compression, friction, and shearing, including particle interaction, mainly by impact force, while being dispersed in the machine. Therefore, in a short time, the immobilization process in which many particles of the abrasive 11 are driven into the particles of the resin material 10 is uniformly performed, and the “ordered mixture” becomes the composite powder material 12. Thereafter, the discharge valve 45 is opened, and the composite powder material 12 is discharged from the discharge port 46 to the outside of the apparatus, and is promptly collected by the collector 34 in FIG.

Here, FIG. 1 shows a conceptual view of the particles 5 of the composite powder material 12 collected in the collector 34 of FIG. That is, in the composite powder material 12, many particles 4 of the abrasive 11 are driven into the particles 3 of the resin material 10 and are in a fixed state.

The above-described powder surface reforming apparatus 30 shown in FIG.
Implements a hybridization (registered trademark of Nara Machinery Co., Ltd.) system.

Therefore, if the manufacturing process of the pad 2 of this embodiment shown in FIG. 4 is viewed as a manufacturing method of the friction material 1, it has a process of mixing multi-component raw materials including the resin material 10 and the abrasive 11. A method for producing a friction material 1, wherein a composite powder material 12 in which a large number of particles 4 of an abrasive 11 are fixed on the surfaces of particles 3 of a resin material 10 by a powder surface modifying means, It can be said that the component and the component of the abrasive 11 are those contained in a multi-component raw material.

Then, the pads 2 of Examples 1 to 6 and Comparative Examples 3 and 4 of FIG. 3 were manufactured by the manufacturing process of the pad 2 of the present embodiment of FIG. In the manufacturing process of the pad 2 according to the present embodiment shown in FIG. 4, the comparative examples 1 to 2 are compared with the prior art using the resin material 10 and the abrasive 11 instead of the composite powder material 12.
Was also manufactured.

In Examples 1 to 6 and Comparative Examples 1 to 4 shown in FIG. 3, the particle size of the resin material 10 contained in the friction material 1 of the pad 2 and the particle size of the abrasive 11 are different from each other. The mixing ratio of the components of the friction material 1 of the pad 2 is as shown in the table of FIG. However, in the third embodiment, the abrasive 11
As a result, a composite powder material 12 is obtained by using silicon carbide instead of zirconium silicate. In Examples 4 and 5, the composite powder material 12 is obtained by using zirconium oxide instead of zirconium silicate as the abrasive 11. In Comparative Example 6,
By using a bisallylnadiimide resin instead of the phenol resin as the resin material 10, the composite powder material 12
Have gained.

In FIG. 3, for each pad 2 of Examples 1 to 6 and Comparative Examples 1 to 4, the "standard test method of dynamometer for passenger car brake system" (JASO-
C406-82), the friction coefficient μ at the time of the second efficacy test at the initial braking speed of 50 km / h was measured. In addition, each initial braking speed at the time of the second efficacy test is 50 km / h, 100 km / h,
At 130 km / h, the braking deceleration is 1.96 to 7.8.
Many friction coefficients μ were measured in the range of 4 m / s ² , and a value obtained by subtracting the minimum value from the maximum value among the friction coefficients μ was calculated as a change Δμ in the friction coefficient.

In FIG. 3, the pads 2 of Examples 1 to 6 and Comparative Examples 1 to 4 are attached to a disc brake of an automobile, and are subjected to predetermined conditions (50 km / h of initial braking speed, 2.94 m / h of braking deceleration). (s ² , 200 times of braking), a matrix of test conditions was set in the range of the pre-braking brake temperature of 60 to 200 ° C. and the braking deceleration of 1.96 to 7.84 m / s ² , and each test was performed. At the time of the braking under the condition, whether or not the sound of the brake sound was generated was examined based on whether or not the sound of the brake was heard by the driver in the vehicle.

Further, in FIG. 3, after inspection for the occurrence of noise, the rotor of the disk brake was measured by a surface roughness measuring device. More specifically, 10 degrees from the center of the rotor toward the outer circumference are perpendicular to the sliding trace of the pad 2.
The measurement was performed with a measurement length of mm, and the ten-point average roughness Rz was determined. The measurement was performed at four points, and the average value of the ten-point average roughness Rz was calculated, and the average value was used as an evaluation index of the flaw of the rotor.

According to FIG. 3, when the acceptance level of the friction coefficient μ is set to 0.35 or more, the friction coefficients μ of Comparative Examples 1 and 4 are lower than the acceptable line of 0.35. It can be said that the pad 2 of Comparative Example 4 has insufficient frictional force. When the acceptable level of the change in friction coefficient Δμ is set to 0.1 or less, the change in friction coefficient
Exceeds 0.1 of the acceptable line, it can be said that the brakes using the pads 2 of Comparative Examples 1 to 3 are likely to have an unstable braking performance. In the brakes using the pads 2 of Comparative Examples 1 and 2 and Comparative Example 4, the sound of the brake is heard by the driver in the vehicle, and it can be said that the brake squeal has occurred.

On the other hand, since the friction coefficient μ of Examples 1 to 6 exceeds 0.35 of the acceptable line, it can be said that the pads 2 of Examples 1 to 6 have a sufficient frictional force. Further, Examples 1 to
Since the change Δμ in the coefficient of friction of No. 6 is less than 0.1 of the acceptable line, it can be said that the brakes using the pads 2 of Examples 1 to 6 always have a stable braking performance. In the brakes using the pads 2 of the first to sixth embodiments, it can be said that no brake sound is heard by the driver in the vehicle, and no brake squeal is generated.

Examination of these measurement results shows that the pad 2 of Examples 1 to 6 is different from the pad 2 of this embodiment in FIG.
Considering that it was manufactured in the manufacturing process of
The factor of the measurement result of the pad 2 in Examples 1 to 6 is that the resin material 1
It is considered that the mixing strength of the abrasive 11 with the friction material 1 was increased by blending the composite powder material 12 as the abrasive 0 and the abrasive 11.

In consideration of the fact that the pads 2 of Comparative Examples 1 and 2 were manufactured by the prior art, Comparative Example 1
The factors of the measurement results of 2 are that the grinding material 11 of the relatively small particles 4 having a particle size of several tens μm or less was mixed without using the composite powder material 12, It is considered that the joining strength of the material 11 was insufficient, and the abrasive 11 fell from the friction material 1 of the pad 2.

On the other hand, although the pad 2 of the comparative example 3 is manufactured in the manufacturing process of the pad 2 of the embodiment of FIG. 4, the brake using the pad 2 of the comparative example 3 is The measurement results show that the braking performance tends to fall into an unstable state. The cause is that the particle size of the resin material 10 is 113 μm, which is larger than that in Examples 1 to 6, and therefore, in the friction material 1, the local uneven distribution of the abrasive 11 fixed to the surface of the particles 3 of the resin material 10. Is thought to have happened.

Further, although the pad 2 of the comparative example 4 is manufactured by the manufacturing process of the pad 2 of the present embodiment of FIG. 4, the frictional force of the pad 2 of the comparative example 4 is not sufficient. Is the measurement result. The reason is that the particle size of the resin material 10 is 12 μm, which is smaller than that in Examples 1 to 6.
It is considered that a large number of particles 4 of the abrasive 11 could not be fixed on the surface of. Therefore, it is considered that brake squealing occurred in the brake using the pad 2 of Comparative Example 4.

In Examples 1 to 6 and Comparative Examples 1 to 4, the particle size of the abrasive 11 was less than 10 μm, which was much smaller than that of the conventional one of several hundred μm.
6. In the disk brake using the pad 2 of Comparative Examples 1 to 4, the surface roughness of the rotor is small, and it can be said that the rotor is not damaged.

As described above in detail, in the friction material 1 of the present embodiment, the surface of the particles 3 of the resin material 10 is ground as the component of the resin material 10 and the component of the abrasive 11 (see FIG. 2). A large number of particles 4 of the material 11 are converted into the powder surface reforming device 3 shown in FIG.
0 (see FIG. 1), the abrasive 11 was already strongly fixed to the resin 10 at the particle level.
The composite powder material 12 is blended. Therefore, unlike the prior art, before the friction material 1 is baked and hardened, the grinding material 11 is already strongly fixed to the resin material 10, so that the joining strength of the friction material 1 with the friction material 1 is increased. Can be.

That is, in the friction material 1 of the present embodiment,
Among the constituent components, the components of the resin material 10 and the abrasive material 11
4 contains a composite powder material 12 (FIG. 4).
5), the composite powder material 12 is applied to the surface of the particles 3 of the resin material 10 by the powder surface reforming device 30 of FIG.
Since the abrasive 11 is already strongly fixed to the resin material 10 at the particle level at a large number of particles 4 (see FIG. 1), the joining strength of the abrasive 11 with the friction material 1 is increased. Thus, it can be said that the friction material 1 of the present embodiment has suppressed the grinding material 11 from collapsing.

Therefore, in the friction material 1 of the present embodiment, even if the particle size of the abrasive 11 is relatively small, not more than several tens of μm, it is possible to prevent the abrasive 11 from collapsing. (See FIG. 3).

Further, in the friction material 1 of the present embodiment,
When the average diameter of the particles 4 of the abrasive 11 is 0.5 μm to 5 μm, a sufficient porosity as the friction material 1 can be sufficiently secured, and at the same time, the average diameter of the particles 3 of the resin material 10 is 1 μm.
When it is 5 μm to 100 μm, a large number of particles 4 of the abrasive 11 can be fixed on the surface of the particles 3 of the resin material 10 and a uniform dispersion state of each component in the friction material 1 can be sufficiently ensured. Therefore, the performance as the friction material 1 can be sufficiently exhibited (see FIG. 3).

Therefore, even if the friction material 1 containing the abrasive 11 of the relatively small particles 4 having a particle diameter of several tens μm or less is used in the pad 2 in order to prevent a brake shudder or the like, the present embodiment can be applied. Pad 2 using friction material 1 in form
As long as the grinding material 11 is prevented from falling from the friction material 1, the frictional force can be sufficiently maintained (see FIG. 3).

Further, in the pad 2 using the friction material 1 of the present embodiment, since the grinding material 11 is prevented from falling down from the friction material 1, when the grinding material 11 falls down from the friction material 1, The unstable state of the braking performance of the brake and the squealing of the brake, which occur, are eliminated, and the driver can be released from the discomfort caused by the situation (see FIG. 3).

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention. For example, in the present embodiment, in the manufacturing process of the pad 2 shown in FIG.
Although the composite powder material 12 is compounded as the entirety of the component 1 and charged into the mixer 21, the resin material 10 may be used from the viewpoint of preventing the abrasive 11 from collapsing from the friction material 1.
The compound powder material 12 is compounded as a part of the component of the abrasive material 11 and the component of the abrasive material 11, and together with the resin material 10 and the abrasive material 11,
It may be put into the mixer 21.

In this embodiment, any one of zirconium silicate, silicon carbide, and zirconium oxide is used as the abrasive 11 (see FIGS. 2 and 3), but silica, alumina, magnesium oxide, etc. Alternatively, a general ceramic powder may be used.

In this embodiment, either one of phenol resin and polyimide resin is used as the resin material 10 (see FIGS. 2 and 3), but a modified phenol resin, epoxy resin, urea Resins, urea resins, polyester resins, and the like may be used.

In this embodiment, the fibrous base material 13
Used aromatic polyamide fibers, copper fibers, and potassium titanate fibers (see FIG. 2).
Inorganic fibers such as glass fibers, silicate fibers, alumina fibers, and carbon fibers, metal fibers such as steel fibers, brass fibers, and bronze fibers, and organic fibers such as hemp, cotton, and phenol fibers may be used.

In the present embodiment, the friction adjusting member 14 is used.
As the filler 15, hardened cashew nut shell oil, graphite, molybdenum disulfide, and barium sulfate have been used (see FIG. 2), but metal sulfides such as rubber powder and antimony, calcium carbonate, slaked lime, etc. Good.

In this embodiment, a hybridization (registered trademark of Nara Machinery Co., Ltd.) system is implemented by the powder surface reforming device 30 shown in FIG. Thus, the surface of the particles 3 of the resin material 10 is made to impinge on the surface of the particles 4 of the abrasive 11 to collide with the surface of the particles 3. The mechanical force such as compression, friction, shearing, etc. The composite powder material 12 was able to be obtained by performing a process of repeatedly giving a positive action. However, if the composite powder material 12 can be obtained, the powder surface modifying means is not limited to the system of hybridization (registered trademark of Nara Machinery Co., Ltd.).

For example, a system of Mechanofusion (registered trademark of Hosokawa Micron Co., Ltd.) is implemented, whereby the mixture of the particles 3 of the resin material 10 and the particles 4 of the abrasive 11 is rubbed and compressed. By subjecting the composite powder material 12 to a process of repeatedly giving a mechanical action of shearing,
May be obtained.

Further, a surface modifying device called Nippon Pneumatic Industrial Co., Ltd., called a surfaging system, was used, whereby a large number of particles 4 of the abrasive 11 were attached to the surface of the particles 3 of the resin material 10. The composite powder material 12 may be obtained by performing a process of dispersing and supplying the powder in a hot air stream and then cooling it with cold air. Here, the abrasive 11
The fixing process for fusing a large number of the particles 4 with the particles 3 of the resin material 10 is uniformly performed.

In the present embodiment, the pad 2 used for the disc brake has been described. However, the same effect can be obtained with a shoe used for the drum brake.

[0056]

According to the friction material of the present invention, a composite powder material is contained as a component of the resin material and a component of the abrasive material in the constituent components thereof. By the reforming means, a large number of particles of the abrasive are driven into or fused with the surface of the particles of the resin material, and at the particle level, the abrasive is already strongly fixed to the resin material. Therefore, it can be said that the friction material of the present invention suppresses the grinding material from collapsing.

Therefore, in the friction material of the present invention, even if the abrasive has a relatively small particle size of several tens μm or less, it is possible to prevent the abrasive from collapsing.

In the friction material of the present invention, if the average particle diameter of the abrasive is 0.5 μm to 5 μm, a sufficient porosity as a friction material can be sufficiently secured, and at the same time, the resin material When the average diameter of the particles is from 15 μm to 100 μm, it is possible to fix a large number of particles of the abrasive on the surface of the particles of the resin material and sufficiently secure a uniform dispersion state of each component in the friction material. Therefore, the performance as a friction material can be sufficiently exhibited.

Therefore, even if a friction material containing a relatively small particle abrasive having a particle size of several tens of μm or less is used to prevent a brake shudder or the like in a pad or a shoe, the friction material of the present invention may be used. In the case of the pad or the shoe using the friction material, since the grinding material is suppressed from falling down from the friction material, the friction force can be sufficiently held.

Further, in the pad or shoe using the friction material of the present invention, since the grinding material is prevented from collapsing from the friction material, brake braking which occurs when the grinding material collapses from the friction material is performed. This eliminates unstable performance and brake squeal, and relieves the driver of discomfort caused by such situations.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a structure in which a large number of abrasive particles are fixed on the surface of resin particles.

FIG. 2 is a table showing the mixing ratio of each component of a friction material.

FIG. 3 is a table comparing the performance of brakes using the pad for each type of composite powder material (resin material and abrasive) blended as a component of the friction material of the pad.

FIG. 4 is a diagram showing a manufacturing process of the pad.

FIG. 5 is a view showing a flow of the powder surface reforming apparatus.

FIG. 6 is a cross-sectional view showing an outline of an immobilization treatment machine of the powder surface modification device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Friction material 2 Pad 3 Resin material particle 4 Grinding material particle 10 Resin material 11 Grinding material 12 Composite powder material 30 Powder surface reforming device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naoki Kotani 2-1-1 Asahi-cho, Kariya-shi, Aichi Aisin Seiki Co., Ltd. Address 1 F-term in Aisin Chemical Co., Ltd. (reference) 3J058 BA73 GA02 GA31 GA62 GA68 GA81 GA92 4F071 AA01 AD06 AE13 AG12 AG21 AG24 AG28 AH07 DA01 DA09 DA15

Claims (7)

[Claims] 1. A composite powder comprising a friction material containing a resin material and an abrasive material as constituents, wherein a plurality of particles of the abrasive material are fixed on the surface of the particles of the resin material by powder surface modification means. A friction material comprising a body material as a component of the resin material and a component of the abrasive. 2. The friction material according to claim 1, wherein the powder surface modifying means collides a particle of the resin material with a large number of particles of the abrasive to impinge on the surface. A friction material. 3. The friction material according to claim 1, wherein the powder surface modifying means repeats a mechanical action by rubbing a mixture of particles of the resin material and particles of the abrasive. A friction material. 4. The friction material according to claim 1, wherein the powder surface modifying means is configured to disperse and supply a plurality of particles of the abrasive to a surface of the particles of the resin material in a hot air stream. A process of cooling with cold air after the cooling. 5. The friction material according to claim 1, wherein the average diameter of the particles of the abrasive is 0.5 μm to 5 μm, and the average diameter of the particles of the resin material. Is 15 μm to 10
0 μm. 6. A pad using the friction material according to any one of claims 1 to 5. 7. A shoe using the friction material according to any one of claims 1 to 5.