JP2000213577A - Manufacturing method of dry clutch facing - Google Patents

Abstract

[PROBLEMS] To produce a dry clutch facing having a base material made of fiber, rubber, a thermosetting resin and a friction improver, to form a coating portion of rubber or the like on almost the entire surface of each strand. The use of such a material makes the friction coefficient of the rubbing surface substantially uniform over the entire surface. SOLUTION: In a defibrating unit B, a process of subjecting a roving 15 to defibrating processing to obtain a substantially band-shaped strand aggregate 3 in which a plurality of strands 2 are arranged in parallel, and a mixed liquid applying unit C
Applying a mixed liquid 7 containing a compounded rubber, an uncured thermosetting resin, and a friction improver to the strand aggregate 3 by a drying process; The step of forming the coating portion 4 from the liquid 7 is used to manufacture the raw material 1. Thereafter, a step of obtaining an annular plate-shaped preform using the raw material 1 and a step of subjecting the preform to pressure molding under heating are used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry clutch facing, and more particularly to a method for producing a dry clutch facing having a base material made of fiber, rubber, a thermosetting resin and a friction improver.

[0002]

2. Description of the Related Art Conventionally, this type of dry clutch facing involves a process of obtaining an annular plate-shaped preform using a material comprising roving, compounded rubber, an uncured thermosetting resin and a friction improver, A step of subjecting a molded body to pressure molding under heating. In this case, in the production of the raw material, roving which is a fiber material of the base material,
A method of impregnating a mixed liquid containing a compounded rubber, an uncured thermosetting resin, and a friction improver, and then subjecting the roving to a drying treatment is adopted.

[0003]

However, since roving is obtained by binding a plurality of strands with a binder, the permeability of the mixed solution to the roving is poor, and therefore the mixed solution must be sufficiently adhered to the surface of each strand. Can not. When such a material is used to produce a dry clutch facing, the surface of each strand has a portion covered with rubber or the like, and an exposed portion that is not covered, and in each strand, the degree of coverage is also different. For this reason, there is a problem that the variation in the friction coefficient on the entire sliding surface of the dry clutch facing is increased, and as a result, judder is easily generated.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dry clutch facing capable of obtaining a dry clutch facing in which the friction coefficient of the rubbing surface is made substantially uniform over the entire rubbing surface. I do.

[0005] To achieve the above object, according to the present invention,
In producing a dry clutch facing having a base material made of fiber, rubber, a thermosetting resin and a friction improver, a step of subjecting a roving to a defibrating treatment to obtain a strand aggregate in which a plurality of strands are arranged in parallel. A step of applying a mixed liquid containing a compounded rubber, an uncured thermosetting resin and a friction improver to the strand aggregate, and performing a drying treatment on the strand aggregate, thereby forming the strand aggregate. Obtaining a material having a covered portion;
There is provided a method for producing a dry clutch facing using a step of obtaining an annular plate-shaped preform using the material and a step of subjecting the preform to pressure molding under heating.

[0006] In the strand aggregate, since there is a gap between the strands, the mixed solution can be sufficiently adhered to the entire surface of the strands. Thereby, it is possible to obtain a dry clutch facing in which the covering portion made of rubber or the like is formed on substantially the entire surface of each strand, and the friction coefficient of the rubbing surface is made substantially uniform over the entire rubbing surface.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a substantially strip-shaped material 1 is used for manufacturing a dry clutch facing, and a plurality of (four in the illustrated example, for convenience) strands 2 are arranged in a substantially strip-like shape. It is composed of an aggregate 3 and a covering portion 4 that covers the strand aggregate 3. Each strand 2 is made of glass fiber or the like. The coating portion 4 is made of a compounded rubber, an uncured thermosetting resin and a friction improver, and a part of the coating portion 4 is also located in a gap between adjacent two strands 2. The covering portion 4 is formed entirely.

[0008] As rubber, NBR, SBR, IR, B
R etc. are used, and as the thermosetting resin, phenol resin, various modified phenol resins, melamine resin, epoxy resin, etc. are used, and as the friction improver, barium sulfate, calcium carbonate, diatomaceous earth, dolomite, etc. Used.

[0009] By using such a material 1,
A dry clutch facing having a base material made of fiber, rubber, a thermosetting resin, and a friction improver can be manufactured. In this dry clutch facing, the friction coefficient of the rubbing surface extends over the entire rubbing surface. It is almost uniform.

For manufacturing the material 1, a material manufacturing apparatus shown in FIGS. The apparatus comprises a supply section A having a roving roll 5, a defibration section B having an air nozzle 6, a tank 8 containing a mixed liquid 7 containing a compounded rubber, an uncured thermosetting resin and a friction improver, and a rectangular shape. Through hole 9
A liquid mixing section C having an adhesion amount adjusting plate 10 having a coating section, a drying section D having a heater 11, a winding section E having a winding roll 12, and an outlet side of a defibrating section B, It comprises a pair of feeding rolls 13 made of rubber, and guide rolls 14 arranged on the inlet side of the defibrating unit B, inside the tank 8 and on the outlet side of the drying unit D, respectively. The feeding speed of the feeding roll 13 and the winding speed of the winding roll 12 are set to be the same.

In the material manufacturing apparatus, a roving 15 in which a plurality of strands 2 are bound by a binder is fed out from a roving roll 5 of a supply unit A and sent to a defibrating unit B.

In the defibrating unit B, a defibrating process is performed in which the air is blown from the air nozzle 6 to the roving 15 to break the binding by the binder, and thereby a substantially band-shaped strand aggregate 3 in which a plurality of strands 2 are arranged in parallel. Is obtained.

The strand aggregate 3 is immersed in the mixture 7 in the mixture application section C. In this case, since the feeding speed and the winding speed are set to the same as described above,
No tensile force acts on the strand aggregate 3,
Therefore, the individual strands 2 are not bundled again.

In the tank 8, the strand aggregate 3 is impregnated with the mixed liquid 7, and the excess of the adhered mixed liquid 7 is squeezed when the strand aggregate 3 passes through the through hole 9 of the adhesion amount adjusting plate 10. Adjusted. In this case, the through-hole 9 is formed in a rectangular shape in accordance with the cross-sectional shape of the substantially band-shaped strand aggregate 3 to which the mixed liquid 7 is adhered, so that the form of the strand aggregate 3 is maintained.

The strand aggregate 3 to which a predetermined amount of the liquid mixture 7 has adhered is sent to the drying section D and subjected to a drying treatment, whereby the material 1 is obtained. The material 1 is wound around a winding roll 12 at a winding section E.

An example of specific manufacturing conditions for the material 1 will be described below. The mixed liquid 7 is a mixture of 50 wt% of a solid content and 50 wt% of a liquid solvent. Table 1 shows the composition of the solid content, and acetone was used as the solvent.

[0017]

[Table 1]

Roving 15: 4630 TEX glass roving (manufactured by Nippon Sheet Glass Co., Ltd.); air blowing pressure in defibrating section B: 0.2 to 0.6 MPa, in this example 0.5 MP
a; feeding speed and winding speed: 5 m / min; dimensions of the through holes 9 of the adhesion amount adjusting plate 10: length 2 mm, width 20 mm; adhesion amount of the mixed solution 7 to the strand aggregate 3: 50 wt%;
Temperature of drying section D: 110 ° C. Under the above conditions, a material 1 having a cross section of width a = 23 mm and thickness b = 3 mm and having a substantially band shape was obtained.

Using the raw material 1, a dry clutch facing was manufactured by the following method.

First, as shown in FIG.
To obtain an annular plate-shaped preform. The helical winding in this case is, as shown in FIG.
b are overlapped, so that the rubbing surface is formed by the surface 1a in the width direction of the material 1. Next, the preform was subjected to pressure molding under heating. That is, the preform is placed in a mold, and is set at 170 ° C and 100 to 200M.
Pa, in this example, a pre-curing treatment is performed under the conditions of 150 MPa and 3 minutes to obtain an annular plate-shaped intermediate body, and then the intermediate body is polished to a thickness of 3.5 mm.
The intermediate was post-cured at 180 ° C. for 3 to 10 hours, in this example, 5 hours. This makes the outer diameter 200mm,
A dry clutch facing (I) having an inner diameter of 140 mm and a thickness of 3.5 mm was obtained.

For comparison, the roving 15 was impregnated with the mixed solution 7 without being subjected to the defibrating treatment, and the through-hole of the adhesion amount adjusting plate 10 was formed into a circular hole having a diameter of 5 mm, so that the roving 15 was adhered. The amount was set in the same manner as described above, and the temperature of the drying section D was set to the same temperature as above to obtain a substantially linear material having a diameter of 6 mm. Using this material, dry clutch facing (II) was obtained in the same manner as described above.

Each dry clutch facing (I), (I
I) was used to construct an automobile clutch, and these dry clutch facings (I) and (II) were evaluated for judder properties. In the evaluation, an accelerometer was attached to the vehicle, and the vibration acceleration in the front-rear direction of the floor at the time of starting after the dry clutch facing was measured.

Table 2 shows the measurement results.

[0024]

[Table 2]

As is clear from Table 2, the dry clutch facing (I) has a smaller vibration acceleration than that of the dry clutch facing (II), and thus the occurrence of judder is greatly suppressed.

[0026]

According to the present invention, a material in which a covering portion made of rubber or the like is formed on substantially the entire surface of each strand is obtained. By using this material, the friction coefficient of the rubbing surface can be substantially reduced over the entire surface. It is possible to obtain a uniform dry clutch facing, and it is also possible to improve the strength of the strand, and thus the dry clutch facing, by forming the covering portion.

Furthermore, since the bound roving is used as the fiber material, it is possible to prevent the working environment from being deteriorated due to the detachment and floating of the fluff. In addition, it is possible to obtain a wide material by using a roving having a large number, that is, a thick material, which is effective in improving the productivity of the material.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a material.

FIG. 2 is a schematic diagram of a material manufacturing apparatus.

FIG. 3 is a plan view of the adhesion amount adjusting plate, which corresponds to a view taken in the direction of arrow 3-3 in FIG. 2;

FIG. 4 is an explanatory view of a forming method of a preform for dry clutch facing.

FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG.

[Explanation of symbols]

 Reference Signs List 1 material 2 strand 3 strand aggregate 7 mixed liquid 15 roving B defibrating section C mixed liquid applying section D drying section

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C09K 3/14 520 C09K 3/14 530G 530 530E F16D 69/02 C F16D 69/02 C08J 5/04 // C08J 5 / 04 5/14 5/14 B29C 67/14 A B29L 31:16 F term (reference) 3J058 AA58 BA76 GA12 GA31 GA55 GA64 GA65 GA76 GA93 GA95 4F071 AA10 AA41 AA42 AB21 AB24 AE12 AE17 AF22 AH07 BB03 4F072 AB21 AD25 AD23 AD02 AE06 AF04 AF06 AG06 AH21 AJ11 AK14 AL02 4F204 AA36 AA37 AA45 AA46 AB01 AB03 AB25 AD16 AE08 AG19 AH05 FA01 FB01 FE27 FF01 FF06 FG02 FH18 4F205 AA36 AA37 AA45 AA46 AB01 HA03 HA19 HA03 AG03 HA19 HA08

Claims (1)

[Claims] In producing a dry clutch facing having a base material made of fiber, rubber, a thermosetting resin and a friction improver, a roving (15) is subjected to a defibrating treatment to form a plurality of strands (2). Obtaining a strand aggregate (3) obtained by juxtaposing the above, and applying a mixed liquid (7) containing a compounded rubber, an uncured thermosetting resin and a friction improver to the strand aggregate (3). And a step of subjecting the strand aggregate (3) to a drying treatment to obtain a material (1) having a coating portion (4) formed from the mixed solution (7). A method for producing a dry clutch facing, comprising: a step of obtaining an annular plate-shaped preform by pressurizing; and a step of subjecting the preform to pressure molding under heating.