JPH1149870A - Wet friction material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain a wet friction material useful for e.g. the multiple-disc clutches of automotive automatic transmissions, by cutting a roll-shaped raw paper in a specific direction to a specified thickness followed by impregnating the resultant paper with a resin so as to render the raw paper wholly available. SOLUTION: First, a roll-shaped raw paper A15 prepared by rolling raw paper A'10 to a diameter virtually the same as that of a clutch plate is cut to a specified thickness perpendicularly to the axial direction of the roll-shaped raw paper A15 to form a friction material B11. Subsequently, the friction material B11 is impregnated with a resin to obtain the objective wet friction material. For example, the roll-shaped raw paper A15 to be used is prepared by alternately rolling raw paper A'10 rich in cellulose fiber and another kind of raw paper rich in aramid fiber; thereby imparting this wet friction material with high coefficient of friction and excellent heat-resistant durability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet friction material used for a multi-plate clutch, a multi-plate brake and a lock-up device for a torque converter of an automatic transmission (AT) for an automobile, and a method of manufacturing the same. .

[0002]

2. Description of the Related Art A conventional method for producing a paper-based friction material, which occupies most of this type of wet friction material, uses a cellulose fiber as shown in FIG. , A fiber that gives strength in the shear direction and improves friction performance but has low durability and heat resistance)
Aramid fiber (small entanglement due to short fiber length, but synthetic resin excellent in heat resistance and durability) and filler etc. are mixed in a predetermined amount, and raw paper 20 flowing from the roll is mixed in a predetermined size. Cut into a ring and friction material 2
1 was manufactured, and the friction material 21 was impregnated with a resin and bonded to an iron plate.

[0003]

However, according to the above-mentioned conventional manufacturing method, when the raw paper 20 is hollowed out into an annular shape having a predetermined size, a portion 22 which is discarded at the center portion or a surrounding portion thereof is formed. Many were done, leading to increased costs. Further, at this stage, the component composition of the friction material 21 is determined, so that there is a problem that improvement at the component composition level is not easy.

The present invention has been made in view of the above problems, and a first object of the present invention is to provide a wet friction material capable of utilizing all of raw paper as a friction material. Is to provide.

A second object of the present invention is to provide a method of manufacturing a wet friction material capable of easily manufacturing a wet friction material which can utilize all of raw paper.

[0006]

In order to achieve the first object, a wet friction material according to the first aspect of the present invention is a rolled raw paper formed by winding raw paper to a diameter substantially equal to that of a clutch plate. Is cut to a predetermined thickness in a direction perpendicular to the axial direction of the rolled raw paper to form a friction material, and the friction material is impregnated with a resin.

With this configuration, the raw paper is rolled up to produce a rolled raw paper having substantially the same diameter as the clutch plate of the wet friction material, and the rolled raw paper is moved in the axial direction of the rolled raw paper. Since the friction material can be obtained by cutting to a predetermined thickness in the vertical direction, all of the raw paper can be used as the friction material.

In order to achieve the first object, the wet friction material according to the second aspect of the present invention is a wet friction material according to the first aspect, wherein the raw paper has a high coefficient of friction and a high heat resistance. The raw paper having durability was laminated.

With this configuration, the wet friction material in which the raw paper having a high coefficient of friction and the raw paper having high heat resistance and durability are laminated, not only can provide the same operation and effect as the operation and effect of the first aspect of the present invention. Obtained, resulting in a more robust wet friction material.

According to a third aspect of the present invention, there is provided a method for manufacturing a wet friction material, wherein a raw paper is rolled up and a roll having substantially the same diameter as a clutch plate of the wet friction material is provided. The raw paper is manufactured, and the rolled raw paper is cut to a predetermined thickness in a direction perpendicular to the axial direction of the rolled raw paper.

Therefore, it is possible to easily manufacture a wet friction material that can use all of the raw paper.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a wet friction material according to the third aspect of the present invention. The rolled raw paper is produced by winding the raw paper having the heat resistance and the raw paper having high heat resistance and durability.

Therefore, not only the same operation and effect as those of the third aspect of the invention can be achieved, but also a more robust wet friction material having a high coefficient of friction, high heat resistance and durability can be easily manufactured. .

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a plan view of a wet friction material according to the present invention, FIG. 1B is a cross-sectional view of the wet friction material, and FIG. 2 is an explanatory view of a method of manufacturing the wet friction material according to the present invention. is there.

As shown in FIGS. 1 and 2, the wet friction material A according to the present invention is a rolled raw paper 1 formed by winding raw paper 10 to a diameter substantially equal to that of a clutch plate (not shown).
5 is cut into a predetermined thickness in a direction perpendicular to the axial direction of the rolled raw paper 15 to form a friction material 11, and the friction material 11 is impregnated with a resin.

Further, a roll-shaped raw paper 15 in which raw paper 10-1 having a high coefficient of friction and raw paper 10-2 having a high heat resistance and durability are alternately laminated is used. May be cut to a predetermined thickness in the vertical direction to form the friction material 16, and the friction material 16 may be impregnated with resin.

Further, in the method for producing a wet friction material according to the present invention, the raw paper 10 is rolled up to produce a rolled raw paper 15 having substantially the same diameter as the clutch plate of the wet friction material. Is cut to a predetermined thickness in a direction perpendicular to the axial direction of the rolled raw paper 15.

That is, as shown in FIG. 2, a predetermined amount of cellulose fiber, aramid fiber, filler and the like are mixed to obtain a raw paper material (not shown). The raw paper 10 is formed by roll forming (not shown).

Then, the raw paper 10 is wound around a roll (not shown) to the same diameter as a clutch plate (not shown) of a necessary wet friction material. When the raw paper 10 is wound up to the same diameter as the clutch plate, the rolled raw paper 10, that is, the rolled raw paper 15 is moved in a direction perpendicular to the axial direction of the rolled raw paper 15. Then, a predetermined thickness is cut with a cutter (a laser cutter or a water cutter may be used from the viewpoint of reducing accuracy and fuzziness) to produce a friction material material 11 having a required shape. I do.

In this manufacturing method, it is conceivable that the durability of the paper itself may be deteriorated due to the cutting of the fibers at the time of cutting, and the shape of the paper itself may be lost after the cutting. While the fibers 12 in 10 are roll-formed, the fibers 12 become parallel to the flow direction of the raw paper 10. Therefore, even if the fibers 12 are cut in a direction perpendicular to the axial direction of the raw paper 15, the fibers 12 can be cut. There is no shredding. In addition, from the current survey results, even long fibers
Since it is 4 mm, there is no significant effect.

As for the latter, as a countermeasure against peeling, for example, as shown in FIG. 4, a large number of holes 1 formed in the tube 18 are provided immediately before the roll having the same diameter as the clutch plate.
3, the resin to be impregnated later is dropped on the raw paper 10, and the resin is uniformly applied on the raw paper 10 with a brush 14 provided in a tube 18. To cure the resin.
In this way, the raw paper 10 does not come off even when the rolled raw paper 15 is cut.

In the course of the production, raw paper (high friction coefficient material) 1 containing a large amount of cellulose fiber is used.
0, when the raw paper (high heat-resistant and durable material) 10 containing many aramid fibers is alternately wound, the raw paper 10-1 having a high coefficient of friction as shown in FIG. The wet friction material A satisfying the required performance, in which the raw paper 10-2 is alternately laminated, can be easily obtained.

[0023]

As described above, according to the wet friction material according to the first aspect of the present invention, the rolled raw paper formed by winding the raw paper to have substantially the same diameter as the clutch plate is used. The friction material is formed by cutting to a predetermined thickness in the direction perpendicular to the axial direction, and the friction material is impregnated with resin. To produce a rolled raw paper having the same diameter, and to cut the rolled raw paper to a predetermined thickness in a direction perpendicular to the axial direction of the rolled raw paper to obtain a friction material material All of the raw paper can be used as the friction material.

According to the wet friction material according to the second aspect of the present invention, in the wet friction material according to the first aspect, raw paper having a high coefficient of friction and raw paper having high heat resistance and durability are laminated. Thereby, not only the same operation and effect as the operation and effect of the invention of claim 1 can be obtained, but also a wet friction material obtained by laminating raw paper having a high friction coefficient and raw paper having high heat resistance and durability can be obtained. It becomes a robust wet friction material.

According to the method of manufacturing a wet friction material according to the third aspect of the present invention, the raw paper is rolled up to produce a roll-shaped raw paper having substantially the same diameter as the clutch plate of the wet friction material. By cutting the raw paper to a predetermined thickness in a direction perpendicular to the axial direction of the rolled raw paper, a wet friction material that can use all of the raw paper can be easily manufactured.

According to a method of manufacturing a wet friction material according to a fourth aspect of the present invention, there is provided the method of manufacturing a wet friction material according to the third aspect, wherein the raw paper having a high friction coefficient and the high heat resistance and durability are obtained. By producing the roll-shaped raw paper by winding the raw paper with each other, not only the same operation and effect as the effect of the invention of claim 3 can be obtained, but also the high friction coefficient is large and the heat resistance is high. A more durable wet friction material having durability can be easily manufactured.

[Brief description of the drawings]

FIG. 1A is a front view of a wet friction material according to the present invention. (2) is a sectional view of the wet friction material.

FIGS. 2 (1), (2) and (3) are illustrations of a method for producing a wet friction material according to the present invention.

FIG. 3 is a perspective view showing a fiber direction (a state of becoming parallel to a flow direction of raw paper) during roll forming.

FIG. 4 is an explanatory diagram of a resin dropping unit and a drying unit as a measure against peeling.

FIG. 5 is a partially omitted cross-sectional view of a wet friction material in which raw paper having a high coefficient of friction and raw paper having high heat resistance and durability are alternately laminated.

FIG. 6 is an explanatory view of a conventional method for producing a wet friction material.

[Explanation of symbols]

 10 Raw paper 11 Friction material 15 Roll raw paper

Claims (4)

[Claims] 1. A roll-shaped raw paper obtained by winding raw paper to a diameter substantially the same as that of a clutch plate is cut into a predetermined thickness in a direction perpendicular to the axial direction of the roll-shaped raw paper to reduce friction material. A wet-type friction material formed and impregnated with a resin. 2. The wet friction material according to claim 1, wherein a raw paper having a high coefficient of friction and a raw paper having a high heat resistance and durability are laminated. 3. Rolling the raw paper to produce a rolled raw paper having substantially the same diameter as the clutch plate of the wet friction material, and rolling the rolled raw paper in a direction perpendicular to the axial direction of the rolled raw paper. A method for producing a wet friction material, wherein the wet friction material is cut into a predetermined thickness. 4. The wet friction material according to claim 3, wherein raw paper having a high coefficient of friction and raw paper having high heat resistance and durability are wound around each other to produce the rolled raw paper. Production method.