JP2009097690A - Friction clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve power transmission characteristics in a high temperature region, besides achieving weight reduction, while attaining high transmission power in a high temperature region and a high rotation region of a friction clutch by using a carbon/black lead material like CC composites. <P>SOLUTION: In the friction clutch, a friction disk assembly comprises a center hub section and a friction disk. While the friction disk includes a first friction surface and second friction surface, a flywheel opposing to the first friction surface includes a third friction surface, and a pressure plate opposing to the second friction surface includes a fourth friction surface. At least one or more in these friction surfaces from first through fourth is formed of a dissimilar material combining the carbon/black lead material with a metal/ceramic material, and has a configuration in which the carbon/black lead material forms a carbon/black lead material based friction surface and the metal/ceramic material forms a metal/ceramic material based friction surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a clutch for intermittently transmitting power from a driving side to a driven side, and more particularly, to a vehicle having a power generation source such as a four-wheeled vehicle or a two-wheeled vehicle (motorcycle, motorbike). Related friction clutch.

  BACKGROUND ART Clutchs have been widely used as a power source from a power generation source such as an automobile engine, which is interrupted by mechanical contact. The friction clutch transmits power by frictional force between two surfaces, transmits power by bringing the two surfaces into contact, and interrupts transmission of power by separating the two surfaces. This friction clutch is frequently used in automobiles (including four-wheeled vehicles and two-wheeled vehicles) because power can be smoothly interrupted.

  FIG. 1 is a cross-sectional view of a conventional friction clutch used in a four-wheeled vehicle (showing a section cut by a plane including the center axis of the center hub). A conventional friction clutch 101 will be described with reference to FIG. Here, for ease of illustration and understanding, illustration of the release bearing, release arm, and the like is omitted. The friction clutch 101 includes a clutch cover 107, a flywheel 103 attached to an engine output shaft (crankshaft), a friction disk assembly 113, a pressure plate 115, and a diaphragm spring 117.

  The friction disk assembly 113 connects the center hub 105 (a main shaft of a transmission (not shown) is inserted and fixed, including a torsion spring 109), the friction disk 111, the center hub 105, and the friction disk 111. And rivets 119.

    The clutch cover 107 constitutes a cylindrical container having a bottomless lid (the bottom surface is all open and the top surface is covered except for an opening described later), and the cylindrical shape is formed on the top surface. A circular opening 107h centering on the central axis is provided. A plurality of diaphragm springs 117 constituting strip-shaped leaf springs are attached along the periphery of the circular opening 107h (each of the strip-shaped diaphragm springs 117 is within a plane including the central axis of the screw member 118 by the screw member 118). In FIG. 2, it can be rotated within a predetermined range.

  One end 117 a of the diaphragm spring 117 is in contact with the convex portion 115 a of the pressure plate 115, thereby urging the pressure plate 115 toward the flywheel 103. The friction disk 111 is pressed against the flywheel 103 by this biasing force, and power is transmitted from the flywheel 103 to the friction disk 111. That is, this state is a state where the clutch is engaged, and power is transmitted from the flywheel 103 to the center hub 105 via the friction disk 111 and the rivet 119.

  In addition, in order for the friction disk 111 to receive the power from the flywheel 103 without slipping, a clutch facing is attached to a portion of the friction disk 111 that is in contact with the flywheel 103 and the pressure plate 115.

  On the other hand, the other end 117b of the diaphragm spring 117 is in contact with a release bearing (not shown), and the other end 117b of the diaphragm spring 117 is also moved by moving the release bearing toward the flywheel 103 by a release arm (not shown). When pressed in this direction, one end 117 a of the diaphragm spring 117 is separated from the convex portion 115 a of the pressure plate 115, and the urging force that urges the friction disk 111 toward the flywheel 103 is lost.

  As a result, the friction disk 111 is not pressed against the flywheel 103 and power is not transmitted from the flywheel 103 to the friction disk 111. That is, this state is a state in which the clutch is disengaged, and power is not transmitted to the center hub 105.

    Such a friction clutch is desired to be small and light and have a large power that can be transmitted. Particularly, when used as a clutch of an automobile, this friction clutch is required due to the recent demands for higher output of an engine, larger indoor space and lighter weight. The trend is great. Such a tendency demands a high transmission power in a high temperature range and a high rotation range for the friction clutch, and various attempts have been made to meet such a demand.

  In such an attempt, it has been studied to make the material of the portion of the friction disk 111 in contact with the flywheel 103 and the pressure plate 115 capable of high transmission power in a high temperature range or a high rotation range.

  In particular, since the friction clutch of a race vehicle used in an automobile race or the like is used under severe conditions, high transmission power is required particularly in a high temperature range and a high rotation range.

In order to provide a friction clutch that achieves high transmission power in such a high temperature range or high rotation range, there is a type using a CC composite for a friction disk (Patent Document 1). In this CC composite, the friction coefficient tends to increase as the temperature of the friction surface increases. Therefore, by using CC composite for the friction disk, high transmission power can be achieved in high temperature range and high rotation range, and the weight can be reduced, the moment of inertia is reduced, and the friction disk can easily follow the change of the rotation speed. It can be done.
Japanese Patent Laid-Open No. 2002-181072

  However, when a carbon / graphite material such as CC composite is used for the friction disk, there is a problem that the power transmission in the low temperature region of the friction clutch is not sufficient due to the low coefficient of friction in the low temperature region. Further, when a carbon / graphite material such as CC composite is used for the friction disk, there is a problem that the cost of the friction clutch is greatly increased because such a material is a relatively expensive material.

  The present invention has been made in view of the circumstances as described above, and by using a carbon / graphite material such as CC composite, it achieves high transmission power in a high temperature range and a high rotation range of the friction clutch, and is lightweight. It is an object to improve power transmission characteristics in a low temperature region after achieving the above.

  Furthermore, another object of the present invention is to reduce the cost of a friction clutch using a carbon / graphite material such as CC composite.

  In order to solve the above-described problems, in the invention described in claim 1, a flywheel rotated by input, a clutch cover attached to the flywheel, and a flywheel pressed against the flywheel. In the friction clutch comprising a friction disk assembly that rotates together with the friction disk assembly, the clutch cover includes a pressure plate for pressing the friction disk assembly against the flywheel, and a biasing member for biasing the pressure plate. , A center hub part that is assembled integrally with the central part of the friction disk assembly and outputs transmission power, and a friction disk that is sandwiched between the flywheel and the pressure plate and transmits rotational power by frictional force. The friction disc is the first facing the flywheel side A friction surface and a second friction surface facing the pressure plate, the flywheel has a third friction surface opposite the first friction surface of the friction disk, and the pressure plate has a second friction surface. A fourth friction surface opposed to the friction surface, and at least one of the first to fourth friction surfaces is made of a dissimilar material combining a carbon / graphite material and a metal / ceramic material, and the carbon / graphite material Is a friction clutch having a structure in which a carbon / graphite material friction surface is formed and a metal / ceramic material forms a metal / ceramic material friction surface.

  Further, the invention described in claim 2 is the friction clutch according to claim 1, wherein the first friction surface and the second friction surface are a combination of a carbon / graphite material and a metal / ceramic material. The friction clutch is composed of different materials, in which the carbon / graphite material forms a carbon / graphite material friction surface and the metal / ceramic material forms a metal / ceramic material friction surface.

  The invention described in claim 3 is the friction clutch according to claim 1 or 2, wherein the carbon / graphite material is made of a CC composite material.

  Further, in the invention described in claim 4, the friction clutch according to any one of claims 1 to 3, wherein the metal / ceramic material is steel, brass, copper, aluminum, titanium, molybdenum, tungsten, Tantalum, and any metal material of these alloys, or alumina, mullite, cordierite, zirconia, titanium oxide, silicon nitride, titanium nitride, aluminum nitride, silicon carbide, titanium carbide, boron carbide, tungsten carbide, The friction clutch was made of a ceramic material of titanium boride and sialon.

  Further, in the invention described in claim 5, the friction clutch according to any one of claims 1 to 4, wherein the friction disk includes a first friction plate, a second friction plate, and a second friction surface. The friction clutch has a three-layer structure including a second friction plate constituting the friction surface and a center plate for fixing and holding the first and second friction plates.

  The invention described in claim 6 is the friction clutch according to claim 5, wherein the first friction plate, the second friction plate, and the center plate are annular, and the first friction plate The plate and the second friction plate were mechanically coupled to the center plate, and the center plate was a friction clutch configured to be mechanically coupled to the center hub portion.

  Further, in the invention described in claim 7, in the friction clutch described in claim 6, the first friction plate, the second friction plate, and the center plate are each divided in a plurality of circumferential directions. It was set as the friction clutch comprised from the made block.

  Further, in the invention described in claim 8, the friction clutch according to any one of claims 5 to 7, wherein the first friction plate main body and the second friction plate main body are made of a carbon / graphite material system. Metal / ceramics, which is a carbon / graphite material that forms a friction surface, and a first friction plate and a fastener for mechanically coupling the second friction plate to the center plate form a metal / ceramic material system friction surface A friction clutch having a material structure was used.

  The invention according to claim 9 is the friction clutch according to any one of claims 1 to 8, wherein the carbon / graphite material friction surface and the metal / ceramic material friction surface are coplanar. The friction clutch is configured to form.

  Further, according to the invention described in claim 10, in the friction disk assembly for the friction clutch, the center hub portion that is integrally assembled to the center portion of the friction disk assembly and outputs transmission power, and rotated by friction force. A friction disk for transmitting power, the friction disk including a first friction surface and a second friction surface, wherein at least one of the first to second friction surfaces is a carbon / graphite material and a metal; / Friction disk assembly composed of different materials combined with ceramic materials, with carbon / graphite material forming carbon / graphite material friction surface and metal / ceramic material forming metal / ceramic material friction surface .

  Further, the invention described in claim 11 is the friction disk assembly according to claim 10, wherein the carbon / graphite material is made of a CC composite material.

  Further, in the invention described in claim 12, in the friction disk assembly described in any one of claims 10 or 11, the metal / ceramic material is steel, brass, copper, aluminum, titanium, molybdenum, tungsten. , Tantalum, and any of these alloys, or alumina, mullite, cordierite, zirconia, titanium oxide, silicon nitride, titanium nitride, aluminum nitride, silicon carbide, titanium carbide, boron carbide, tungsten carbide , Titanium boride, and a friction disk assembly made of a ceramic material of any one of sialon.

  Furthermore, the invention described in claim 13 is the friction disk assembly according to any one of claims 10 to 12, wherein the friction disk includes a first friction plate, a first friction plate, and a first friction surface. A friction disk assembly constituted by a three-layer structure including a second friction plate constituting two friction surfaces and a center plate for fixing and holding the first and second friction plates was obtained.

  Further, in the invention described in claim 14, in the friction disk assembly described in claim 13, the first friction plate, the second friction plate, and the center plate are annular, The friction plate and the second friction plate were mechanically coupled to the center plate, and the center plate was mechanically coupled to the center hub portion.

  Further, in the invention described in claim 15, in the friction disk assembly described in claim 14, the first friction plate, the second friction plate, and the center plate are each in a plurality of circumferential directions. The friction disk assembly was composed of divided blocks.

  Furthermore, the invention described in claim 16 is the friction disk assembly according to any one of claims 13 to 15, wherein the first friction plate body and the second friction plate body are made of a carbon / graphite material. A carbon / graphite material that forms a friction surface, and a first friction plate and a fastener for mechanically coupling the second friction plate to the center plate are metal materials / metals that form a ceramic friction surface. The friction disk assembly was made of a ceramic material.

  The invention described in claim 17 is the friction disk assembly according to any one of claims 10 to 16, wherein the carbon / graphite material friction surface and the metal / ceramic material friction surface are the same. The friction disk assembly is configured to form a flat surface.

  In the present invention, as described above, a friction surface made of a dissimilar material combining a carbon / graphite material (for example, CC composite) and a metal / ceramic material is formed on the friction surface of either the friction clutch or the friction disk assembly. As a result, high power transmission performance can be achieved in a high temperature range and a high rotation range, and a stable and sufficient level of power transmission performance can be exhibited even in a low temperature range and a low rotation range.

  Further, since a material having a small specific gravity such as a carbon / graphite material (for example, CC composite) is used, the weight of the friction clutch or the friction disk assembly can be reduced.

  Furthermore, since the moment of inertia of the rotating body can be reduced, the friction disk can easily follow the change in the number of rotations, and it is possible to connect / disconnect rotational power with good response.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments of the present invention described here are examples of the present invention and are not limited thereto.

  In this specification, “carbon / graphite material” means “material made of carbon material or graphite material”, and “metal / ceramic material” means “material made of metal material or ceramic material”. And

  FIG. 2 shows a friction clutch according to the present invention, and shows a cross-sectional view of the friction clutch cut along a plane including the central axis of the center hub. In FIG. 2, the release bearing, the release arm, and the like are not shown for ease of explanation.

  A friction clutch 201 according to the present invention includes a clutch cover 207, a flywheel 203 attached to an engine output shaft (crankshaft), a friction disk assembly 213, a pressure plate 215, and a diaphragm spring 217. .

  The friction disk assembly 213 includes a center hub 205 (a part to which a main shaft of a transmission (not shown) is inserted and fixed, and this part also includes a torsion spring 209), a friction disk 211, a friction with the center hub 205. It has a rivet 219 connecting the disk 211.

    The clutch cover 207 constitutes a cylindrical container having a bottomless lid (the lower surface is all open, and the upper surface is covered except for an opening described later), and the cylindrical shape is formed on the upper surface. A circular opening 207h centering on the central axis is provided. A plurality of diaphragm springs 217 constituting strip-shaped leaf springs are attached along the periphery of the circular opening 207h (each of the strip-shaped diaphragm springs 217 is in a plane including the central axis of the screw member 218 by the screw member 218). In FIG. 2, it can be rotated within a predetermined range.

  One end 217 a of the diaphragm spring 217 is in contact with the convex portion 215 a of the pressure plate 215, thereby urging the pressure plate 215 toward the flywheel 203. By this urging force, the friction disk 211 is pressed against the flywheel 203, and power is transmitted from the flywheel 203 to the friction disk 211. That is, this state is a state where the clutch is engaged, and power is transmitted from the flywheel 203 to the center hub 205 via the friction disk 211 and the rivet 219.

  The other end 217b of the diaphragm spring 217 is in contact with a release bearing (not shown). When the release bearing is moved toward the flywheel 203 by a release arm (not shown), the other end 217b of the diaphragm spring 217 is also in this direction. Accordingly, one end 217 a of the diaphragm spring 217 is separated from the convex portion 215 a of the pressure plate 215, and the urging force that urges the friction disk 211 toward the flywheel 203 is lost.

  As a result, the friction disk 211 is not pressed against the flywheel 203, and power is not transmitted from the flywheel 203 to the friction disk 211. That is, this state is a state in which the clutch is disengaged, and power is not transmitted to the center hub 205.

  FIG. 3 is an enlarged cross-sectional view of a portion (part A) of the friction disk 211 in FIG.

  2 and 3, the friction disk 211 includes a first friction plate 221, a second friction plate 222, a center plate 223, a first friction bush 224, and a second friction bush 225. Has been. The first friction plate 221 and the first friction bush 224 form a first friction surface, and the second friction plate 222 and the second friction bush 225 form a second friction surface. This constitutes a friction surface that determines the power transmission characteristics of the clutch.

  The first friction plate 221 and the second friction plate 222 and the first friction bush 224 and the second friction bush 225 are made of different materials, and the first friction plate 221 and the second friction plate 221 are made of different materials. The plate 222 may be made of a carbon / graphite material, and the first friction bush 224 and the second friction bush 225 may be made of a metal / ceramic material, or the first friction plate 221 and the second friction bush. The plate 222 may be made of a metal / ceramic material, and the first friction bush 224 and the second friction bush 225 may be made of a carbon / graphite material.

  The first friction plate 221 and the first friction bush 224, and the second friction plate 222 and the second friction bush 225 each form one friction surface. The surfaces of the first friction bush 224, the second friction plate 222, and the second friction bush 225 are processed to form the same plane.

  FIG. 3 shows an embodiment of a friction disk 211 having a friction surface in which one friction surface is made of a different material by forming the friction plate and the friction bush by carbon / graphite material and metal / ceramic material, respectively. Is shown.

  In this embodiment, since the friction plate is made of carbon / graphite material and the friction bush is made of metal / ceramic material, the friction plate constitutes a carbon / graphite material friction surface, and the friction bush is made of metal. / Configure ceramic material friction surface.

  The friction bush may be inserted into the friction plate in a nested manner, and may be mechanically fixed to the friction plate. However, the first friction bush 224 and the second friction bush 225 are respectively provided with a female screw and a male screw. Are inserted into and fitted in through holes provided in the first friction plate 221, the second friction plate 222, and the center plate 223, and the female screw and the male screw are screwed together to thereby center the plate. The first friction plate 221 and the second friction plate 222 may be fixed to 223.

  Here, an embodiment has been described in which the first and second friction plates are made of carbon / graphite material, and the first and second friction bushes are made of metal / ceramic material. Instead, the first and second friction plates may be made of a metal / ceramic material, and the first and second friction bushes may be made of a carbon / graphite material.

  Further, the shape of the carbon / graphite material friction surface and the metal / ceramic material friction surface composed of the friction plate and the friction bush and the ratio of the sizes thereof are not particularly limited.

  Here, as the carbon / graphite material constituting the carbon / graphite material friction surface, generally used industrial carbon materials, polycrystalline graphite, pyrolytic graphite, and the like can be used.

  Furthermore, it is more desirable to use CC Composite (Carbon Fiber Carbon Composite) which is a composite material reinforced with carbon fiber as a carbon / graphite material from the viewpoint of strength and wear resistance.

  The CC composite is composed of carbon fiber or graphite fiber as a reinforcing fiber and carbon or graphite material as a matrix for solidifying the reinforcing fiber. The CC composite used here may have sufficient density and strength while being repeatedly carbonized and graphitized by repeated pitch filling and firing, or around carbon or graphite fibers that are pre-configured in three dimensions. Those produced by various methods such as vapor deposition of pyrolytic carbon or graphite can be used.

  In addition, the CC composite used here may contain the following metals and ceramics.

  Titanium, silicon, iron, tungsten, molybdenum, copper, aluminum, tin, lead, zinc, magnesium, iron-based alloy, copper alloy, aluminum alloy, titanium alloy, alumina, mullite, cordierite, zirconia, titanium oxide, silicon nitride Titanium nitride, aluminum nitride, silicon carbide, titanium carbide, boron carbide, tungsten carbide, titanium boride, magnesium oxide, iron oxide, zinc oxide, chromium oxide, calcium carbonate, barium sulfate and the like.

  Examples of the metal / ceramic material constituting the friction surface of the metal / ceramic material include steel such as chromium molybdenum steel (type symbol: SCM), brass, copper, aluminum, titanium, molybdenum, tungsten, tantalum, and Any metal material of these alloys, or alumina, mullite, cordierite, zirconia, titanium oxide, silicon nitride, titanium nitride, aluminum nitride, silicon carbide, titanium carbide, boron carbide, tungsten carbide, titanium boride , And any of the sialon ceramic materials can be used.

  As explained above, the first friction surface and the second friction surface are made of different materials combining carbon / graphite material and metal / ceramic material, so that the third friction surface (flywheel side friction surface) The fourth friction surface (pressure plate side friction surface) can be made of a metal material or a ceramic material as described above.

In general, the friction coefficient of the friction surface due to the combination of the CC composite and the metal / ceramic material tends to increase as the temperature of the friction surface of the CC composite increases.
When the temperature of the friction surface of the CC composite is relatively low, the friction coefficient of the friction surface is low and large power cannot be transmitted.

  However, for example, when the first and second friction plates are made of CC composite and the first and second friction bushes are made of metal / ceramic material, in the stage where the temperature of the friction surface is low, the metal / Stable torque can be transmitted due to the friction between the ceramic surface and the metal / ceramic surface. When the temperature of the friction surface increases, the high friction coefficient of the CC composite (or carbon / graphite material) contributes. Therefore, large power transmission becomes possible.

  That is, by adopting the configuration of the friction surface as described above, the disadvantage of the friction characteristics of CC composite (or carbon / graphite material) (problem that sufficient power transmission cannot be realized if the temperature of the friction surface is low). It is possible to compensate for this.

  In the above embodiment, it has been described that a friction surface combining a CC composite (or carbon / graphite material) and a metal / ceramic material is formed on the first friction surface and the second friction surface of the friction disk. It is not limited to this. At least one of the first and second friction surfaces of the friction disk, the third friction surface facing the friction disk of the flywheel, or the fourth friction surface facing the friction disk of the pressure plate It is also possible to form a friction surface combining a CC composite (or carbon / graphite material) and a metal / ceramic material.

  FIG. 4 shows a front view of the friction disk assembly 213 shown in FIGS. In this embodiment, the friction disk 211 has an annular shape and is mechanically coupled to the center hub 205 via the center plate 223 of the friction disk 211. As a method of mechanically fixing the center plate 223 to the center hub 205, a method of fixing using a plurality of rivets 219 is employed, but screw connection or welding may be used.

  In this embodiment, the friction disk 211 of the friction disk assembly 213 is manufactured separately from the center hub 205 and is mechanically integrated later. A method of integrally manufacturing the center plate 223 of the disk 211 as a continuous body may be employed.

  In the embodiment shown in FIG. 4, the plurality of friction bushes are arranged at equal intervals on the circumference, but are not necessarily arranged at equal intervals on the circumference.

  FIG. 5 is a front view of a friction disk assembly 213 according to still another embodiment. In this embodiment, the friction disk 211 has a sector shape obtained by cutting an annular disk in the circumferential direction, and a plurality of such sector friction disks 211 are arranged via a sector center plate 223. The center hub 205 is mechanically coupled. As a method of mechanically fixing the center plate 223 to the center hub 205, a method of fixing using a plurality of rivets 219 is adopted as in the embodiment shown in FIG. It may be joined by welding.

  Also in this embodiment, the friction disk 211 of the friction disk assembly 213 is manufactured separately from the center hub 205 and is mechanically integrated later. A method of integrally manufacturing the disk-shaped center plate 223 of the disk 211 as a continuous body may be employed.

  In this way, by making the first friction plate and the second friction plate annular or fan-shaped, the amount of expensive CC composite used is reduced and a significant cost reduction can be realized. . Furthermore, by adopting the fan-shaped first friction plate and second friction plate, these parts can be cut out from the large plate of CC composite with good yield, which further contributes to cost reduction. Will be able to.

  As a method of fixing the friction plate to the center plate, a female screw and a male screw are provided on the first friction bush 224 and the second friction bush 225, respectively, and the first friction plate 221, the second friction plate 222, The first friction plate 221 and the second friction plate 222 are fixed to the center plate 223 by inserting and fitting them into through holes provided in the center plate 223 and screwing the female screw and the male screw. However, the present invention is not limited to this.

  As another example of a method of forming a friction surface composed of different materials combining a CC composite (or carbon / graphite material) and a metal / ceramic material on the first friction surface and the second friction surface of the friction disk, Position of the first friction plate and the first friction bush, the second friction plate and the second friction bush as shown by 221-2, 224-2 and 222-2, 225-2 in FIG. It may be formed in a shape, or may be formed in a position and shape as indicated by 221-3, 224-3 and 222-3, 225-3 in FIG.

  For example, as shown in FIG. 6, in addition to the first friction bush 224 and the second friction bush 225, the first friction plate 221 and the second friction plate 222 are connected to the center plate 223 by using a shear pin 226 in combination. It is possible to firmly fix to. In this case, the first friction plate 221 and the second friction plate 222 are applied to the center plate 223 with a predetermined surface pressure by the screwing force of the female screw and the male screw provided in the first friction bush 224 and the second friction bush 225. Press. Then, the first friction plate 221 and the second friction plate 222 are provided in advance with recessed holes that fit into the shear pins 226 that are fitted and disposed through the center plate 223. By assembling the pins 226 with each other, the shear force between the first friction plate 221 and the second friction plate 222 and the center plate 223 generated when the clutch power is transmitted by the shear pin 226 is transmitted. can do.

  By adopting the method described here as a method for fixing the friction plate to the center plate, more reliable transmission of power is possible.

FIG. 1 shows a sectional view of a friction clutch according to the prior art. FIG. 2 shows a sectional view of the friction clutch according to the present invention. FIG. 3 is an enlarged view of a cross-section (A portion shown in FIG. 2) of the friction disk of the friction clutch according to the present invention. FIG. 4 is a front view of a friction disk assembly according to an embodiment of the present invention. FIG. 5 is a front view of a friction disk assembly according to another embodiment of the present invention. FIG. 5-2 is a front view of a friction disk assembly according to still another embodiment of the present invention. FIG. 5-3 is a front view of a friction disk assembly according to still another embodiment of the present invention. FIG. 6 is an enlarged cross-sectional view of the friction disk, and shows another embodiment in which the friction plate is fixed to the center plate.

Explanation of symbols

201 friction clutch 203 flywheel 205 center hub 207 clutch cover 211 friction disk 213 friction disk assembly 215 pressure plate 217 diaphragm spring 219 rivet 221 first friction plate 222 second friction plate 223 center plate 224 first friction bush 225 first Second friction bush 226 Shear pin

Claims (17)

A flywheel rotated by input,
A clutch cover attached to the flywheel;
A friction clutch comprising a friction disk assembly that rotates together with the flywheel by being pressed against the flywheel,
The clutch cover includes a pressure plate for pressing the friction disk assembly against the flywheel, and a biasing member for biasing the pressure plate,
The friction disk assembly is assembled integrally with the center portion of the friction disk assembly, and is sandwiched between the center hub portion for outputting transmission power, the flywheel and the pressure plate, and is rotated by frictional force. Equipped with a friction disk for transmitting
The friction disk includes a first friction surface facing the flywheel side and a second friction surface facing the pressure plate,
The flywheel includes a third friction surface facing the first friction surface of the friction disk,
The pressure plate includes a fourth friction surface facing the second friction surface of the friction disk,
At least one of the first to fourth friction surfaces is made of a dissimilar material that is a combination of a carbon / graphite material and a metal / ceramic material, and the carbon / graphite material has a carbon / graphite material system friction surface. / Friction clutch characterized in that the ceramic material forms a metal / ceramic material friction surface.   2. The friction clutch according to claim 1, wherein the first friction surface and the second friction surface are made of different materials combining carbon / graphite material and metal material / ceramic, and the carbon / graphite material is carbon. / Friction clutch, characterized in that the metal / ceramic material forms a metal / ceramic material friction surface.   3. The friction clutch according to claim 1, wherein the carbon / graphite material is composed of a CC composite material.   4. The friction clutch according to claim 1, wherein the metal / ceramic material is steel, brass, copper, aluminum, titanium, molybdenum, tungsten, tantalum, or an alloy thereof. Materials or ceramics of alumina, mullite, cordierite, zirconia, titanium oxide, silicon nitride, titanium nitride, aluminum nitride, silicon carbide, titanium carbide, boron carbide, tungsten carbide, titanium boride, and sialon A friction clutch comprising a material.   5. The friction clutch according to claim 1, wherein the friction disk includes a first friction plate constituting a first friction surface, a second friction plate constituting a second friction surface, and A friction clutch comprising a three-layer structure comprising a center plate for fixing and holding the first and second friction plates.   6. The friction clutch according to claim 5, wherein the first friction plate, the second friction plate, and the center plate are annular, and the first friction plate and the second friction plate are attached to the center plate. A friction clutch that is mechanically coupled and the center plate is mechanically coupled to a center hub portion.   7. The friction clutch according to claim 6, wherein each of the first friction plate, the second friction plate, and the center plate includes a plurality of blocks divided in a circumferential direction. Friction clutch.   The friction clutch according to any one of claims 5 to 7, wherein the first friction plate main body and the second friction plate main body are carbon / graphite material forming a carbon / graphite material system friction surface, A friction clutch characterized in that the first friction plate and the fastener for mechanically coupling the second friction plate to the center plate are a metal / ceramic material forming a metal material / ceramic friction surface.   9. The friction clutch according to claim 1, wherein the carbon / graphite material friction surface and the metal / ceramic material friction surface are configured to form the same plane. Friction clutch to do. A friction disk assembly for a friction clutch,
The friction disk assembly includes a center hub portion for outputting transmission power, and a friction disk for transmitting rotational power by friction force, which are integrally assembled to a central portion of the friction disk assembly.
The friction disk includes a first friction surface and a second friction surface,
At least one of the first to second friction surfaces is made of a dissimilar material in which a carbon / graphite material and a metal / ceramic material are combined, and the carbon / graphite material has a carbon / graphite material system friction surface, / Friction disc assembly characterized in that the ceramic material forms a metal / ceramic material friction surface.   11. The friction disk assembly according to claim 10, wherein the carbon / graphite material is made of a CC composite material.   12. The friction disk assembly according to claim 10 or 11, wherein the metal / ceramic material is one of steel, brass, copper, aluminum, titanium, molybdenum, tungsten, tantalum, and alloys thereof. Metal material or one of alumina, mullite, cordierite, zirconia, titanium oxide, silicon nitride, titanium nitride, aluminum nitride, silicon carbide, titanium carbide, boron carbide, tungsten carbide, titanium boride, and sialon Friction disk assembly characterized by comprising ceramic material.   The friction disk assembly according to any one of claims 10 to 12, wherein the friction disk includes a first friction plate constituting a first friction surface, a second friction plate constituting a second friction surface, And a friction disk assembly comprising a three-layer structure comprising a center plate for fixing and holding the first and second friction plates.   14. The friction disk assembly according to claim 13, wherein the first friction plate, the second friction plate, and the center plate are annular, and the first friction plate and the second friction plate are center plates. A friction disk assembly, wherein the center plate is mechanically coupled to the center hub portion.   15. The friction disk assembly according to claim 14, wherein each of the first friction plate, the second friction plate, and the center plate includes a plurality of blocks divided in a circumferential direction. Friction disk assembly to do.   The friction disk assembly according to any one of claims 13 to 15, wherein the first friction plate body and the second friction plate body are carbon / graphite materials forming a carbon / graphite material system friction surface, The friction disk assembly wherein the fastener for mechanically coupling the first friction plate and the second friction plate to the center plate is a metal / ceramic material forming a metal material / ceramic friction surface .   17. The friction disk assembly according to claim 10, wherein the carbon / graphite material system friction surface and the metal / ceramic material system friction surface are formed in the same plane. Friction disk assembly.

Images