JP2008038963A - Multiple disk type clutch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiple disk type clutch device capable of enhancing an oil discharge effect, and capable of preventing a drag torque from increasing even when used for a long period. <P>SOLUTION: This multiple disk type clutch device is provided with a plurality of substantially annular clutch disks 6, a plurality of substantially annular clutch plates 7 layered alternately with the clutch disks 6, a friction material 10 fixed along a face opposed to the each clutch plate of the each clutch disk 6, a plurality of protruded abutting parts 10a formed in the friction material 10 by press molding using a molding die, and a groove part 10b formed between the adjacent abutting parts 10a in accompaniment to the molding of the abutting parts 10a by the molding die, and extended along a radial direction of the clutch disk 6. The friction material 10 is formed while having an intermittent part 11 wider than the groove part 10b provided substantially coplanarly to the groove part 10b, with the abutting parts 10a arranged at a substantially equal interval in other portion. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plurality of substantially annular clutch disks coupled to an input system on the engine side, and a plurality of substantially annular clutches stacked alternately with the clutch disks and coupled to an output system on the wheel side. The present invention relates to a multi-plate clutch device having a plate.

  In general, a multi-plate clutch device provided in a motorcycle or the like is for transmitting a driving force of an engine and transmitting or shutting off the driving wheel arbitrarily, and has a substantially annular shape connected to an input system on the engine side. It has a plurality of clutch disks, and a plurality of substantially annular clutch plates that are alternately stacked with the clutch disks and connected to an output system on the wheel (drive wheel) side.

  A friction material made of a cork material or the like is fixed to the surface of the clutch disk facing the clutch plate, and a convex contact portion is formed by pressing the mold against the friction material. The contact portion is configured to transmit power by being brought into pressure contact with the clutch plate, and to be separated (released from the pressure contact force) to block transmission of the power.

As described above, a groove extending in the radial direction of the clutch disk is formed between the contact portions formed on the friction material, and the oil is discharged from the groove when the clutch disk rotates. It can function as a passage. By the way, conventionally, as disclosed in Patent Document 1, for example, a multi-plate clutch device has been proposed in which a groove shape shallower than the groove is formed in the contact portion. According to such a multi-plate clutch device, oil can be discharged from a shallow groove shape formed in the contact portion in addition to oil discharge from the groove portion.
Japanese Utility Model Publication No. 1-146018

  However, in the conventional multi-plate clutch device, although an oil draining effect can be obtained in the initial use, if the friction material contact portion wears with long-term use of the device, it forms on the contact portion. The groove shape thus formed disappears, and there is a problem that the oil discharging effect is reduced. Thus, if the oil draining effect is reduced, the oil remains between the clutch disc and the clutch plate when the clutch disc is separated from the clutch plate (release of pressure contact force) and the clutch is released. And the drag torque increases due to the viscous resistance of the oil.

  The present invention has been made in view of such circumstances, and provides a multi-plate clutch device that can improve the oil draining effect and can prevent an increase in drag torque even after long-term use. There is to do.

  According to the first aspect of the present invention, a plurality of substantially annular clutch disks connected to an input system on the engine side, and a substantially annular ring stacked alternately with the clutch disks and connected to an output system on the wheel side. A plurality of clutch plates, a friction material fixed along a surface of the clutch disc facing the clutch plate, and capable of being pressed against or separated from the clutch plate, and a plurality of the friction plates formed on the friction material by press molding using a mold. A convex contact portion that contacts the clutch plate surface during pressure contact with the clutch plate, and the contact portion that is formed adjacent to the contact portion formed by the molding die, In the multi-plate clutch device having a groove extending in the radial direction of the clutch disk, the friction material has an intermittent portion that is substantially flush with the groove and wider than the groove. One said abutment portion at the other site is characterized by being formed at substantially equal intervals.

  According to a second aspect of the present invention, in the multi-plate clutch device according to the first aspect, the intermittent portions are formed at substantially equal intervals in the circumferential direction of the friction material.

  According to a third aspect of the present invention, in the multi-plate clutch device according to the first or second aspect, the groove portion is formed in a helical shape with respect to the clutch disk.

  According to the first aspect of the present invention, the friction material fixed to the clutch disk has intermittent portions that are substantially flush with the groove portion and wider than the groove portion, and contact portions are formed at substantially equal intervals in other portions. Therefore, the oil discharging effect can be improved, and an increase in drag torque can be prevented even when used for a long time.

  According to the invention of claim 2, since the intermittent portions are formed at substantially equal intervals in the circumferential direction of the friction material, the oil is discharged while the friction material is pressed almost uniformly. It can be made better.

  According to the invention of claim 3, since the groove portion is formed in a helical shape with respect to the clutch disk, oil can be discharged in accordance with the rotation of the clutch disk in one direction.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The multi-plate clutch device according to the present embodiment is disposed in a vehicle such as a two-wheeled vehicle and arbitrarily transmits or cuts off the driving force of an engine or a mission to a wheel (driving wheel) side, and is shown in FIG. Thus, the clutch housing 2 that forms the gear 1 and forms the engine-side input system, the clutch member 4 that is connected to the shaft 3 and forms the wheel-side output system, and the right end of the clutch member 4 in FIG. It is mainly composed of a pressure 5 attached to the side, a clutch disk 6 connected to the clutch housing 2 side, and a clutch plate 7 connected to the clutch member 4 side.

  The gear 1 is rotatable about the shaft 3 when a driving force (rotational force) transmitted from the engine is input, and is connected to the clutch housing 2 by a rivet 8 or the like. The clutch housing 2 is formed of a cylindrical case member opened on the right end side of the figure, and a plurality of clutch disks 6 are formed on the inner peripheral wall thereof. Each of the clutch disks 6 is made of a plate material formed in a substantially annular shape, is engaged with the clutch housing 2, and is configured to be able to rotate with the rotation of the clutch housing 2.

  The clutch member 4 is formed of a cylindrical case member disposed in the clutch housing 2 and opened on the right end side in the figure. The shaft 3 is connected to the substantially center of the clutch member 4 by spline fitting while passing therethrough, and the shaft 3 is also rotated when the clutch member 4 rotates. A spline extending in the rotation axis direction (left and right direction in the figure) is formed on the outer peripheral wall of the clutch member 4, and the clutch plate 7 is fitted into the spline.

  Such clutch plates 7 are alternately laminated with the clutch disks 6 so that adjacent ones can be pressed against or separated from each other. That is, the clutch disk 6 and the clutch plate 7 are allowed to slide in the direction of the rotation axis of the clutch member 4 and are pressed against each other when pressed by the pressure 5 in the left direction in FIG. The force is transmitted to the clutch member 4 and the shaft 3, and when the pressure by the pressure 5 is released, the clutch member 4 stops and stops following the rotation of the clutch housing 2, and transmits the rotational force to the shaft 3. Will not be done.

  As shown in FIG. 2, a friction material 10 having a high frictional resistance such as a cork material is fixed to the surfaces (front and back surfaces) of the clutch disk 6 facing the clutch plate 7. The surface of the friction material 10 is formed along the surface of the clutch disk 6, and has a convex contact part 10 a and a groove part 10 b extending in the radial direction of the clutch disk 6 between the adjacent contact parts 10 a. In addition, an intermittent portion 11 to be described later is formed, and when the contact portion 10 a contacts the clutch plate 7, the clutch plate 7 and the clutch disk 6 are pressed against each other.

  In the present invention, the separation between the clutch disk 6 and the clutch plate 7 does not have to be a state in which a clearance is generated between the clutch disk 6 and the clutch plate 7, and even if no physical clearance is generated. The state where the pressure contact is released and the clutch member 4 does not follow the rotation of the clutch housing 2 (that is, the state where the drive side clutch plate 6 slides on the driven side clutch plate 7) is also included.

  The pressure 5 is formed in a substantially disc shape so as to close the opening (right end in the figure) of the clutch member 4, and is always urged leftward in the figure by the clutch spring S. That is, the clutch member 4 is formed with a boss portion 4b extending and penetrating to the pressure 5 side. The clutch bolt B is inserted into the boss portion 4b and the head side of the clutch bolt B and the pressure 5 are connected to each other. With the clutch spring S interposed therebetween, the pressure 5 is always urged to the left.

  On the other hand, the edge 5a of the pressure 5 is in contact with the rightmost portion in the figure where the clutch disk 6 and the clutch plate 7 are laminated, and the clutch disk 6 and the clutch plate 7 are brought into contact with each other by the urging force of the clutch spring S. It comes to come in pressure contact. Accordingly, the clutch housing 2 and the clutch member 4 are always connected, and the shaft 3 can be rotated when a rotational force is input to the gear 1.

  However, a push rod 9 extending in the axial direction is disposed inside the shaft 3, and when the driver operates an operating means (not shown), the push rod 9 protrudes to the right in the figure, The pressure 5 can be moved rightward against the urging force of the clutch spring S. When the pressure 5 moves in the right direction, the pressure contact force between the clutch disk 6 and the clutch plate 7 is released, and the rotational force input to the gear 1 and the clutch housing 2 is transmitted to the clutch member 4 and the shaft 3 in a separated state. Instead, it will be blocked. That is, the pressure 5 is configured so that the clutch disk 6 and the clutch plate 7 can be pressed against or separated from each other as the clutch member 4 moves in the axial direction.

  In order to restrict the rotation of the pressure 5 relative to the clutch member 4, a stopper portion 5 b is protruded from the pressure 5. The stopper portion 5b extends from the pressure 5 to the left side in the figure and has a substantially convex shape formed integrally with the pressure 5, and is fitted into a concave portion 4a formed on the inner peripheral wall of the clutch member 4. It functions as a detent that restricts the rotation of the pressure 5 relative to the clutch member 4.

  Here, as shown in FIGS. 3 to 6, the clutch disk 6 according to the present embodiment is formed by attaching the friction material 10 to the front and back surfaces of the core material W made of a metal member or a resin member. The contact portion 10a, the groove portion 10b, and the intermittent portion 11 described above are formed on the surface. That is, an adhesive is applied in advance to the front and back surfaces of the core material W, and the friction material before molding is brought into contact with and adhered to the front and back surfaces, respectively, and thereafter, as shown in FIGS. Is pressed from above and below, and the contact portion 10a is formed by the protruding surface Pa of the mold P, and the groove portion 10b is formed by the concave surface Pb of the mold P.

  On the other hand, a buildup N is applied to a predetermined portion of the plurality of concave surfaces Pb in the mold P, and the surface Na of the buildup N is substantially flush with the protruding surface Pa. Thereby, the site | part pressed by the protrusion surface Pa and the surface Na will form the intermittent part 11 wider than the said groove part 10b, substantially the same as the groove part 10b. As shown in FIG. 3, the portion where the meat is N is set such that the intermittent portions 11 are formed at substantially equal intervals along the circumferential direction of the friction material 10.

  The friction material 10 fixed to the clutch disk 6 by the pressure molding by the molding die P has the intermittent portion 11 which is substantially flush with the groove portion 10b and wider than the groove portion 10b, and the abutting portion 10a at other portions. Since the multi-plate clutch device is used, the oil is discharged from the intermittent portion 11 in addition to the discharge of the oil from the groove portion 10b. Therefore, the oil discharging effect can be improved, and an increase in drag torque can be prevented even when used for a long time.

  Further, by applying the build-up N to a predetermined portion of the mold P, the intermittent portion 11 that can discharge oil well without changing the existing mold much can be formed. Furthermore, according to the present embodiment, the intermittent portions 11 are formed at substantially equal intervals along the circumferential direction of the friction material 10, so that the pressure contact of the friction material 10 with the clutch plate 7 is performed substantially evenly. Oil can be discharged more favorably.

Next, examples of the present invention will be given and experimental results for demonstrating the superiority will be described.
First, 48 contact portions formed at equal intervals with respect to the friction material 10 (comparative example) and 8 contact portions are deleted from the comparative example (that is, 8 intermittent portions are formed). The lining area (pressure contact area with the clutch plate) and drag torque with those of the above (Example) were compared. The experimental results are summarized in Table 1 below.

  From Table 1 above, it is clear that the lining area of the example remained 16.6% lower than that of the example, while the drag torque decreased by 24.2%, It can be seen that the drag torque can be effectively reduced even if the lining area is reduced.

Furthermore, the number of contact portions and intermittent portions formed on the friction material 10 was variously changed, and the lining area (pressure contact area with the clutch plate) and the drag torque were compared. The experimental results are summarized in Table 2 below and FIG.

  From the above Table 2 and FIG. 9, when compared with the same lining area, the number of intermittent portions of 6 to 10 is more effective in reducing drag torque than the others. It became clear.

  Although the present embodiment has been described above, the present invention is not limited to this. For example, as shown in FIG. 10, the groove 10 b ′ may be formed helically with respect to the clutch disk 6. In this case, oil can be discharged in response to rotation in one direction of the clutch disk 6 (during forward rotation). That is, when the clutch disk 6 rotates counterclockwise in the figure, the internal oil can be more effectively discharged to the outside.

  The applied friction material may be another material (such as a paper-based or rubber-based friction material) as long as it can be used in a wet multi-plate clutch device. Further, the multi-plate clutch device of the present invention can be applied to various multi-plate clutch types such as automobiles, three-wheel or four-wheel buggies, and general-purpose machines in addition to two-wheeled vehicles.

  If the friction material is a multi-plate clutch device that has an intermittent portion that is substantially flush with the groove portion and wider than the groove portion, but the contact portions are formed at substantially equal intervals in other parts, the outer shape is different or The present invention can also be applied to those with other functions added.

1 is a longitudinal sectional view showing a multi-plate clutch device according to an embodiment of the present invention. A perspective view showing a clutch disk and a clutch plate in the multi-plate clutch device Top view showing the clutch disc IV-IV line sectional view in FIG. VV line sectional view in FIG. Sectional view taken along line VI-VI in FIG. The cross-sectional schematic diagram which shows the shaping | molding die which shape | molds the friction material of the clutch disc, Comprising: The figure which shows the location where an intermittent part is not formed The cross-sectional schematic diagram which shows the shaping | molding die which shape | molds the friction material of the clutch disc, Comprising: The figure which shows the location in which an intermittent part is formed The graph which shows the relationship between the lining area of an Example, and drag torque The top view which shows the clutch disk in other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gear 2 Clutch housing 3 Shaft 4 Clutch member 4a Recessed part 5 Pressure 5b Stopper part 6 Clutch disk 7 Clutch plate 8 Rivet 9 Push rod 10 Friction material 10a Contact part 10b Groove part 11 Intermittent part

Claims (3)

A plurality of substantially annular clutch disks connected to the input system on the engine side;
A plurality of substantially annular clutch plates that are alternately stacked with the clutch disks and connected to the output system on the wheel side;
A friction material fixed along the surface of the clutch disk facing the clutch plate, and capable of being pressed against or separated from the clutch plate;
A plurality of the friction material formed by pressure molding with a molding die, and a convex contact portion that contacts the clutch plate surface during pressure contact with the clutch plate;
A groove portion formed between adjacent contact portions as the contact portion is formed in the mold, and extending in the radial direction of the clutch disk;
In the multi-plate clutch device comprising:
The friction material has an intermittent portion that is substantially flush with the groove portion and wider than the groove portion, and the contact portions are formed at substantially equal intervals in other portions.   The multi-plate clutch device according to claim 1, wherein the intermittent portions are formed at substantially equal intervals along a circumferential direction of the friction material.   3. The multi-plate clutch device according to claim 1, wherein the groove is formed in a helical shape with respect to the clutch disk.

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