JP2000018298A - Clutch plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch plate thinned in a state that a frictional material facings are used, and having high adhesion strength, and high lubricity and coolability by adhering the frictional material facings to a thin part formed on an outer peripheral part of a base material. SOLUTION: The fan-shaped frictional material facings 5 are formed on the ring-shaped thin parts 15 of a predetermined width of an outer peripheral part on both surfaces of a base material 13. The fin-shaped frictional material facings 5 are adhered to the thin parts 15. To adhere the frictional material facings 5, the through holes 17 formed on the adhesion ranges of the thin parts 15 are filled with a thermosetting adhesive agent, and further the surfaces of the thin parts 15 are coated with the adhesive agent so that the frictional material facings 5 are adhered thereto. The oil is passed through a gap 9 between the frictional material facings 5 by the centrifugal force and an inner plate 11 is cooled. The oil passing through the gap 9 is passed through the through holes 17 of the areas free from the frictional material facings 5 to cool the inner plate 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch plate which is used for a friction clutch and has a friction material facing bonded to a base material.

[0002]

2. Description of the Related Art A clutch plate 201 (wet friction plate) is described in Japanese Utility Model Laid-Open No. 5-87341.

[0003] As shown in Figs.
Numeral 1 indicates that friction material segments 205 are bonded to both surfaces of the base material 203, and a gap 207 is formed between the friction material segments 205.

[0004] Since the friction material segment 205 adhered to the base material 203 slides with the mating clutch plate, the clutch plate 201 has improved clutch capacity and durability, stabilizes friction torque, and reduces centrifugal force. Oil received is gap 20
7, the cooling material and the lubricating property of the clutch plate 201 are improved by being supplied to the base material 203 and the respective portions of the friction material segment 205, and the durability is further improved.

[0005]

However, the clutch plate 201 has the following problems.

[0006] (1) Friction material segment 2
Since the thickness T1 of the clutch plate 201 is increased by an amount corresponding to the bonding of the clutch plate 05, the number of clutch plates and the clutch capacity that can be arranged in a fixed arrangement space are reduced, and in order to obtain a constant clutch capacity, The space for the arrangement increases, and the friction clutch becomes large.

Thus, the degree of freedom in designing the friction clutch unit is reduced.

(2) The friction material segment 205 is
03, it is difficult to apply an adhesive to a uniform thickness, the adhesive strength becomes uneven, and the surface pressure on the clutch plate when the friction clutch is fastened is also uneven. Therefore, the friction material segment 205 is formed at a place where the adhesive strength is low.
May be peeled off.

(3) As shown in (2), since the adhesive strength of the friction material segment 205 is insufficient, if the mating clutch plate has an oil groove for lubrication and cooling, the friction material segment 205 is further increased. Since it is easy to peel off, it is difficult to provide an oil groove in the clutch plate on the mating side.

Therefore, the lubricity and the cooling property (heat dissipation property) become insufficient, and the durability tends to decrease.

Accordingly, an object of the present invention is to provide a clutch plate which is formed thin while using a friction material facing, or has a high adhesive strength of the friction material facing, and a high lubricity and a high cooling property.

[0012]

According to a first aspect of the present invention, there is provided a clutch plate for a friction clutch, wherein the clutch plates respectively connected to a pair of rotating members are pressed and fastened by pressing means, and the rotating member is provided. And a friction material facing bonded to the base material and sliding with a mating clutch plate, wherein the friction material facing is bonded to a thin portion formed on an outer peripheral portion of the base material. It is characterized by having.

As described above, in the clutch plate of the first aspect, the friction material facing is adhered to the thin portion provided on the base material, so that the thickness of the clutch plate becomes thinner, unlike the conventional example.

Therefore, the number of clutch plates and the clutch capacity which can be arranged in a fixed arrangement space can be increased, or the arrangement space of the clutch plates for obtaining a constant clutch capacity can be reduced, and the friction clutch can be made more compact. Become.

Thus, the degree of freedom in designing the friction clutch unit is increased.

A clutch plate according to a second aspect of the present invention is a clutch plate for a friction clutch which presses and fastens clutch plates respectively connected to a pair of rotating members by pressing means, wherein the base material connected to the rotating members. And a friction material facing that is adhered to the base material and slides with the mating clutch plate, wherein the base material has a plurality of concave portions at a portion where the friction material facing is adhered, and the friction material facing The adhesive is filled in the recess at the time of bonding.

As described above, in the clutch plate according to the second aspect, the concave portion (for example, a through hole) is provided in the base material, and the concave portion is filled with the adhesive and the friction material facing is bonded.

Since there is no shortage of adhesive in the concave portion, the variation in the adhesive strength of the friction material facing is smaller than in the conventional example, and the adhesive strength does not become lower than a predetermined value. Is improved.

Therefore, even if a large surface pressure is applied when the friction clutch is engaged, the friction material facing is prevented from peeling or falling off.

[0020] Further, since the adhesive strength of the friction material facing is improved in this manner, unlike the conventional example,
It is possible to provide an oil groove for lubrication and cooling on the mating clutch plate, and sufficient oil is supplied from this oil groove to the surfaces of the mating clutch plate and the friction material facing to perform lubrication and cooling. , Mutual sliding is stable,
The friction torque is stabilized, and abnormal wear and seizure are prevented, so that the durability is greatly improved.

This oil groove may be formed by forming a large number of grooves, for example, concentrically, radially, spirally, or by combining these.

Furthermore, if the structure of claim 1 is added to the structure of claim 2 to make the clutch plate thinner, the distance between the clutch plate having good cooling performance and the mating clutch plate can be reduced, so that the friction material facing side clutch plate can be reduced. Cooling is also improved,
The cooling performance and durability of the entire friction clutch are greatly improved.

Further, since the concave portion can be used as a positioning mark of the friction material facing, for example, even when the friction material facing is manually adhered, it is possible to adhere to an accurate location, and the difference in the adhesion position can be obtained. In addition to avoiding the correction operation, the bonding operation is facilitated, the bonding operation is sped up, and the operation cost is greatly reduced.

Further, since the concave portion is used as a positioning mark for the friction material facing, there is no need to newly provide a positioning mark, and the cost can be reduced accordingly.

A clutch plate according to a third aspect of the present invention is the clutch plate for a friction clutch, wherein the clutch plates respectively connected to a pair of rotating members are pressed together by pressing means and fastened, and the base material connected to the rotating members. And a friction material facing that is adhered to the base material and slides on the mating clutch plate. The base material has a through hole at a portion where the friction material facing is not adhered.

As described above, in the clutch plate according to the third aspect, the through-hole is provided in the portion of the base material where the friction material facing is not bonded, so that the oil passes through the through-hole, so that the cooling performance and the durability are improved. Greatly improved.

According to a fourth aspect of the present invention, there is provided the clutch plate according to the second aspect, wherein the through-hole is a concave portion for filling with an adhesive, and an effect equivalent to that of the second aspect is obtained. .

In addition, by forming the recess as a through-hole, the processing is facilitated and the effect of improving the adhesive strength is obtained.

The invention according to claim 5 is the invention according to claims 1 to 4.
5. The clutch plate according to claim 1, wherein the friction material facing is alternately bonded in a circumferential direction between both surfaces of the base material, and is equivalent to any one of claims 1 to 4. To get the effect.

Many of the segmented friction materials having excellent durability and strength and stable friction torque are expensive, and therefore, it is desirable to reduce the amount of the friction material used as much as possible for cost reduction.

Accordingly, in this configuration, the friction material facings are alternately bonded in the circumferential direction between one surface and the other surface of the base material, so that the number of friction material facings bonded to one clutch plate is increased. Can be greatly reduced, and the cost is reduced accordingly.

The cost reduction effect of this configuration in which the number of friction material facings used is small is particularly high when an expensive material sheet such as carbon fiber is used.

The invention according to claim 6 is characterized in that only one rotating member side clutch plate is formed by bonding a friction material facing to a base material, and friction material facings are bonded to both surfaces of the base material. Thus, the same effect as any of claims 1 to 5 is obtained.

In addition to this, the friction material facing is bonded only to the clutch plate on one rotating member side, and the friction material facing is not bonded to the mating clutch plate, so that it is equivalent to any one of the first to fifth aspects. While the effect of (1) is obtained, the bonding operation of the friction material facing is easier and the implementation cost is reduced.

According to a seventh aspect of the present invention, there is provided the first to fourth aspects.
The clutch plate according to any one of the above, wherein both rotating member-side clutch plates are formed by bonding friction material facing to the base material, and the friction material facing is provided on each one surface of both rotating member-side clutch plates. The surface on which the friction material facing of the one-side clutch plate is bonded faces the surface of the mating clutch plate on which the friction material facing is not bonded. 4 and an effect equivalent to that of any of 4 is obtained.

In addition, since the friction material facing is bonded only to one surface of each of the two rotating member side clutch plates, it is not necessary to match the phase of the friction material facing on both surfaces of the same clutch plate. While obtaining the same effect as any one of the first to fourth aspects, the bonding operation of the friction material facing is made easier and the implementation cost is reduced.

[0037]

1 and 2 show a first embodiment of the present invention.
An embodiment will be described. This embodiment has the features of claims 1 and 6. In the following description, members and the like that are not given reference numerals are not shown.

FIGS. 1 and 2 show the inner plate 1 (the clutch plate of the first embodiment). FIG. 1 is a plan view, and FIG. 2 is a sectional view taken along line AA of FIG.

The inner plate 1 is used for a multi-plate clutch (friction clutch). The multi-plate clutch includes an inner plate 1, an inner clutch hub (rotating member), an outer plate, and an outer clutch housing (rotating member). ), And a pressing means for pressing the inner plate 1 and the outer plate.

The inner plate 1 has a ring-shaped base material 3
And eight friction material facings 5.

The base material 3 is connected to a clutch hub movably in the axial direction by a lug formed on the inner periphery.

A ring-shaped thin portion 7 having a predetermined width is formed on the outer peripheral portions of both surfaces of the base material 3. The fan-shaped friction material facing 5 is bonded to the thin portion 7. The friction material facings 5 on both surfaces are provided in the same phase.

Carbon fibers are used for the friction material facing 5. Each friction material facing 5 is bonded to the thin portion 7 with a thermosetting adhesive.

Gaps 9 are provided in the radial direction between the friction material facings 5. The oil receives the centrifugal force and passes through the gap 9 to cool the inner plate 1, and the outer plate and the friction material facing 5 are formed by the relative rotation of the inner plate 1 and the outer plate.
To cool and lubricate each sliding part.

Thus, the inner plate 1 is formed.

As described above, the inner plate 1 has the friction material facing 5 adhered to the thin portion 7 of the base material 3, so that the thickness T2 is smaller than that of the conventional example.

Therefore, when the arrangement space of the clutch plates is fixed, the number of disposable clutch plates and the clutch capacity of the multi-plate clutch increase.

When the clutch capacity is fixed, the space for disposing the clutch plate can be made smaller, and the multi-plate clutch becomes compact.

Thus, the degree of freedom in designing a multi-plate clutch is increased.

Further, since the friction material facing 5 is bonded only to the inner plate 1 and the friction material facing 5 is not bonded to the mating outer plate, as described above,
While obtaining the effect of reducing the thickness T2, the operation of bonding the friction material facing 5 is easier in the entire multi-plate clutch, and the implementation cost is reduced.

Next, a second embodiment of the present invention will be described with reference to FIGS. This embodiment is described in claims 1, 2, 3,
It has four and six features. In the following description, members and the like that are not given reference numerals are not shown.

FIGS. 3 and 4 show the inner plate 11 (second
2 shows a clutch plate according to the embodiment. FIG. 3 is a plan view, and FIG. 4 is a sectional view taken along line BB of FIG.

The inner plate 11 is used for a multi-plate clutch. The multi-plate clutch is composed of an inner plate 11, a clutch hub, an outer plate, a clutch housing, pressing means for pressing the inner plate 11 and the outer plate, and the like. Have been.

The inner plate 11 includes a ring-shaped base material 13 and eight friction material facings 5.

The base material 13 is connected to the outer periphery of the clutch hub movably in the axial direction by a lug formed on the inner periphery.

A ring-shaped thin portion 15 having a predetermined width is formed on the outer peripheral portions of both surfaces of the base material 13. And
The fan-shaped friction material facing 5 is bonded to the thin portion 15. The friction material facings 5 on both surfaces are provided in the same phase. Carbon fiber is used for the friction material facing 5.

The thin portion 15 and each friction material facing 5
A total of 16 through-holes 17 (concave portions) are provided at equal intervals in the circumferential direction in 9 gaps between them.

In bonding the friction material facing 5,
A thermosetting adhesive is filled in the through-hole 17 provided in the bonding area of the thin portion 15, and the adhesive is further applied to the surface of the thin portion 15, and the friction material facing 5 is bonded. .

The through holes 17 provided in the gaps 9 between the friction material facings 5 are not filled with an adhesive.
Oil is allowed to pass through. In addition, the through-hole 17 between each friction material facing 5 may be formed by applying to the inner plate in which the thin portion 15 is not provided.

Further, a large number of oil grooves are provided on both sliding surfaces of the outer plate. The oil groove is formed by forming a large number of grooves, for example, concentrically, radially, spirally, or a combination thereof.

As shown in FIG. 3, the oil passes through the gaps 9 between the friction material facings 5 by centrifugal force to cool the inner plate 11. Further, due to the relative rotation between the inner plate 11 and the outer plate, the oil is guided to the sliding portions between the outer plate and the friction material facing 5 to lubricate and cool each sliding portion.

The oil passing through the gap 9 cools the inner plate 11 by passing through the through hole 17 where the friction material facing 5 is not bonded.

Further, a sufficient amount of oil is supplied from the oil groove provided in the outer plate to the sliding portion between the outer plate and the friction material facing 5 of the inner plate 11,
Since lubrication and cooling are performed, sliding between each other is stabilized, friction torque is stabilized, and abnormal wear and seizure are prevented, so that durability is greatly improved.

Thus, the inner plate 11 is formed.

As described above, the inner plate 11
Since the thickness T2 is reduced by bonding the friction material facing 5 to the thin portion 15 of the base material 13, when the space for disposing the clutch plates is constant, the number of disposable clutch plates and the clutch When the capacity is increased and the clutch capacity is kept constant, the space for disposing the clutch plate can be reduced, and the multi-plate clutch becomes compact.

Thus, the degree of freedom in designing a multi-plate clutch is increased.

Also, as described above, the inner plate 11
Is formed by filling the through hole 17 of the thin portion 15 with an adhesive and bonding the friction material facing 5 to the through hole 17.
In this case, since the amount of the adhesive does not become insufficient, the adhesive strength of the friction material facing 5 does not become less than a certain value due to a small variation, and the overall adhesive strength is improved.

Therefore, even if a large surface pressure is applied when the multi-plate clutch is engaged, the friction material facing 5 is prevented from peeling or falling off.

In addition, since the adhesive strength of the friction material facing 5 is improved as described above, it is possible to provide an oil groove for lubrication and cooling in the outer plate on the mating side, as described above, and the cooling performance is improved. Besides, the friction torque of the multi-plate clutch is stabilized by the lubrication effect, and the durability is greatly improved.

Further, since the oil passes through the through-hole 17 in the portion where the friction material facing 5 is not bonded, the cooling property and the durability of the inner plate 11 are greatly improved.

Further, since the distance between the inner plate 11 and the outer plate having the improved cooling effect is reduced by making the inner plate 11 thinner, the mutual cooling performance and the durability of the multi-plate clutch are further improved. I do.

Further, since the through holes 17 can be used as positioning marks when the friction material facing 5 is bonded, even when the friction material facing 5 is bonded manually, the bonding position can be adjusted. It becomes easy and it becomes possible to adhere to a precise place.

Therefore, the difference in the bonding position and the repair work can be avoided, and the bonding work is facilitated, the bonding work is sped up, and the working cost is greatly reduced.

Further, since the through holes 17 are used as the positioning marks, it is not necessary to separately provide the positioning marks, and the cost can be reduced accordingly.

Further, since the friction material facing 5 is bonded only to the inner plate 11 and the friction material facing 5 is not bonded to the other outer plate, the effect of reducing the thickness T2 is obtained as described above. In the entire multi-plate clutch, the operation of bonding the friction material facing 5 is so easy, and the implementation cost is reduced.

As described above, the inner plate 11
By improving the lubrication of the outer plate and the outer plate, the friction torque is stabilized and the durability is greatly improved, so that the multi-plate clutch using these plates and the device using this multi-plate clutch have the expected performance over a long period of time. Can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described.

FIGS. 5 to 7 show the inner plate 19 (clutch plate of the third embodiment), FIG. 5 is a plan view, and FIG.
5 is a sectional view taken along line CC of FIG. 5, and FIG.

The inner plate 19 is used for a multi-plate clutch. The multi-plate clutch is composed of an inner plate 19, a clutch hub, an outer plate, a clutch housing, pressing means for pressing the inner plate 19 and the outer plate, and the like. Have been.

The inner plate 19 is composed of a ring-shaped base material 21 and a total of six facings 23 bonded three by three to each surface of the base material 21.

The base material 21 is axially movably connected to the outer periphery of the clutch hub by a lug formed on the inner periphery.

The base material 21 has a fan-shaped thin portion 25 having a thin plate thickness.
Are alternately formed in the circumferential direction on both sides. Six friction material facings 23 are bonded to the thin portion 25 (three on each surface). The friction material facing 23 on one surface corresponds to a portion of the other surface where the friction material facing 23 is not provided.

A carbon fiber is used for the friction material facing 23. Each friction material facing 23 is bonded to the thin portion 25 with a thermosetting adhesive.

As shown in FIG. 7, a gap 27 is formed between each surface of each friction material facing 23 and the surface of each outer plate facing each other, and at both ends in the circumferential direction of each friction material facing 23. A concave groove 28 extending in the radial direction is formed, and the oil passes through the gap 27 due to centrifugal force, and the oil accumulated in the concave groove 28 scatters to cool the inner plate 19 and to cool the inner plate 19. The relative rotation with the outer plate guides the sliding portion between the outer plate and the friction material facing 23 to lubricate and cool each sliding portion.

Thus, the inner plate 19 is formed.

As described above, the inner plate 19
The friction material facing 23 is bonded to the thin portion 25 of the base material 21 and, particularly, the friction material facing 23 is alternately bonded on both surfaces of the base material 21, so that the thickness T3 is greatly reduced.

Therefore, when the arrangement space of the clutch plates is fixed, the number of disposable clutch plates and the clutch capacity of the multi-plate clutch increase, and when the clutch capacity is fixed, the arrangement space of the clutch plates is increased. And the multi-plate clutch becomes compact.

Thus, the degree of freedom in designing a multi-plate clutch is increased.

Also, the friction material facings 23 bonded to one inner plate 19 by alternately bonding the friction material facings 23 on both surfaces of the base material 21 in the circumferential direction.
3, the number of sheets is greatly reduced, and the cost is reduced accordingly.

In the case of the inner plate 19 in which an expensive material sheet such as carbon fiber is used for the friction material facing 23, the cost reduction effect due to the small number of friction material facings 23 is particularly high.

Further, since the friction material facing 23 is adhered only to the inner plate 19 and the friction material facing 23 is not adhered to the outer plate on the other side, the effect of reducing the thickness T3 is obtained as described above. In the entire multi-plate clutch, the operation of bonding the friction material facing 23 is so easy, and the implementation cost is reduced.

As described in claim 7,
In the present invention, the friction material facing is bonded only to one surface of each of the rotating member side clutch plates, and each friction material facing is configured to face the surface of the mating clutch plate on which the friction material facing is not fixed. Is also good.

This eliminates the need to match the phase of the friction material facing on both surfaces of the clutch plate, making the work of bonding the friction material facing easier and reducing the implementation cost.

[0094]

According to the first aspect of the present invention, the thickness of the clutch plate is reduced by bonding the friction material facing to the thin portion of the base material, and the number of clutch plates that can be arranged in a fixed arrangement space is improved. In addition, the clutch capacity is increased, or the space for disposing the clutch plate for obtaining a constant clutch capacity is reduced, and the friction clutch becomes more compact.

Thus, the degree of freedom in designing the friction clutch unit is increased.

In the clutch plate according to the second aspect, the adhesive is filled also in the plurality of concave portions of the base material and the friction material facing is bonded, so that the variation in the adhesive strength of the friction material facing is reduced, and the overall adhesive strength is reduced. Therefore, even if a large surface pressure is applied when the friction clutch is engaged, the friction material facing is prevented from peeling or falling off.

Further, since the adhesive strength of the friction material facing is improved, it is possible to provide an oil groove for lubrication and cooling on the mating clutch plate, and the lubrication and cooling stabilize the friction torque, thereby improving the durability. The performance is greatly improved.

Further, since the concave portion can be used as a positioning mark of the friction material facing, for example, even when the friction material facing is manually adhered, it is possible to adhere to an accurate place, and the difference in the adhesion position can be obtained. In addition to avoiding the correction operation, the bonding operation is facilitated, the bonding operation is sped up, and the operation cost is greatly reduced.

In the clutch plate according to the third aspect, the oil passes through the through-hole provided in the portion of the base material where the friction material facing is not bonded, so that the cooling performance and the durability are greatly improved.

According to the fourth aspect of the invention, the same effect as that of the second aspect is obtained, and the recess is formed as a through hole.
This facilitates processing and improves the adhesive strength.

The invention of claim 5 is the invention of claims 1 to 4
In addition to obtaining the same effect as any of the above, the number of friction material facings bonded to one clutch plate can be significantly reduced by alternately bonding friction material facings in the circumferential direction between both surfaces of the base material. And cost is reduced accordingly.

The cost reduction effect of this configuration for reducing the number of friction material facings to be used is particularly high when an expensive material sheet, for example, carbon fiber or the like is used.

The invention of claim 6 is the invention of claims 1 to 5
The same effect as any one of the above is obtained, and the friction material facing is bonded only to the clutch plate on one rotating member side, and the friction material facing is not bonded to the other clutch plate. While obtaining the same effect as above, the operation of bonding the friction material facing is easier and the implementation cost is reduced.

The invention of claim 7 is the first to fourth aspects of the present invention.
By obtaining the same effect as any one of the above, and by bonding the friction material facing to only one surface of each of the two rotating member side clutch plates, it is not necessary to match the phase of the friction material facing on both surfaces of the same clutch plate,
While obtaining the same effect as any one of the first to fourth aspects, the bonding operation of the friction material facing becomes easier accordingly, and the implementation cost is reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an inner plate according to a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view showing an inner plate according to a second embodiment.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a plan view showing an inner plate according to a third embodiment.

FIG. 6 is a sectional view taken along the line CC of FIG. 5;

FIG. 7 is a view as seen from an arrow D in FIG. 5;

FIG. 8 is a plan view showing a conventional clutch plate.

FIG. 9 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 1, 11, 19 Inner plate (clutch plate) 3, 13, 21 Base material 5, 23 Friction material facing 7, 15, 25 Thin portion provided in each base material 17 Through hole (recessed portion) provided in base material 13 ) 27 gap 28 concave groove

Claims (7)

[Claims] 1. A clutch plate for a friction clutch which presses and fastens clutch plates respectively connected to a pair of rotating members by pressing means, wherein the base material connected to the rotating member and the base material A clutch plate, comprising: a friction material facing that is adhered and slides with a mating clutch plate, wherein the friction material facing is bonded to a thin portion formed on an outer peripheral portion of the base material. 2. A clutch plate for a friction clutch, wherein clutch plates respectively connected to a pair of rotating members are pressed and fastened to each other by a pressing means, wherein a base material connected to the rotating member, and The base material has a plurality of concave portions at a portion where the friction material facing is bonded, and is bonded to the concave portions when the friction material facing is bonded. A clutch plate characterized by being filled with an agent. 3. A clutch plate for a friction clutch, wherein clutch plates respectively connected to a pair of rotating members are pressed and fastened to each other by a pressing means, wherein a base material connected to the rotating member, and A clutch plate comprising a friction material facing that is adhered and slides with a mating clutch plate, wherein the base material has a through hole at a portion where the friction material facing is not bonded. 4. The clutch plate according to claim 2, wherein the recess is a through hole for filling an adhesive. 5. The invention according to claim 1, wherein the friction material facings are circumferentially alternately bonded between both surfaces of the base material. Clutch plate. 6. The invention according to claim 1, wherein only one of the rotating member-side clutch plates is formed by bonding a friction material facing to a base material, and is provided on both surfaces of the base material. And a friction material facing is bonded to the clutch plate. 7. The invention according to claim 1, wherein both of the rotating member-side clutch plates are formed by bonding a friction material facing to a base material, and the friction material facing is formed by both friction members. It is adhered to only one surface of the rotating member side clutch plate, and the surface where the friction material facing of the one side clutch plate is bonded faces the surface of the mating clutch plate where the friction material facing is not bonded. Features clutch plate.