JP2001241463A - Clutch disk assembly and clutch device provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the clutch drag in a clutch device having a clutch disk assembly. SOLUTION: This clutch disk assembly 2 is provided with an internal circumferential side damper 2a and an outer circumferential side clutch disk 2b. The damper 2a is interlocked with the input shaft of a transmission in the rotating direction. The clutch disk 2b is arranged outside the damper 2a and provided with friction facings 11 and 12 and an installation part 10b (frictional engagement part) of a core plate 10 sandwiched between a flywheel and a pressure plate. The internal circumferential part 10a of the clutch disk 2b is fixed to the damper 2a. The clutch disk 2b is provided with an opening 2c for communication a space in the flywheel side with a space in the pressure plate side in the friction engagement part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch disk assembly, and more particularly to a clutch disk device, which is pressed against a flywheel by a pressing member of a clutch device and frictionally engages with the flywheel.
The present invention relates to a clutch disk assembly for connecting a flywheel and an input shaft of a transmission, and a clutch device including the same.

[0002]

2. Description of the Related Art FIG. 5 is a longitudinal sectional view of a general clutch device. As shown in FIG. 5, a clutch device for transmitting / cutting torque between an engine of a vehicle and a transmission generally includes a clutch disk assembly 2 and a clutch cover assembly 3.

The clutch disk assembly 2 includes an inner peripheral damper portion 2a and an outer peripheral clutch disk 2b. The damper portion 2a on the inner peripheral side is a structure that plays a role of absorbing and attenuating the torque fluctuation, and includes an input plate including a clutch plate 22 and a retaining plate 23, a spline hub 21, and a torsion connecting these in a circumferential direction. A spring 24 and the like are provided. The input shaft of the transmission is non-rotatably connected to the spline hub 21.

The clutch disk 2b on the outer peripheral side includes a core member 10 and friction facings 111 and 112 mounted on both surfaces of the core member 10. The inner peripheral part 10a of the core member 10 is fixed to the outer peripheral part of the clutch plate of the damper part 2a. The clutch disk 2 b is pressed toward the flywheel 90 by the pressure plate 32 of the clutch cover assembly 3, and
The rotation torque from the flywheel 90 is transmitted to the damper part 2a while being held between the pressure plate 32 and the pressure plate 32.

[0005] The clutch cover assembly 3 is mounted on the flywheel 90 and covers the clutch disc assembly 2, and has a pressure plate 32 facing the flywheel 90 with the clutch disc 2b interposed therebetween. The pressure plate 32 presses the clutch disc 2b toward the flywheel 90 and releases the press in accordance with the operation of the vehicle operator.

[0006]

In the above-described clutch device, the diameter of the clutch disk assembly 2 has been reduced due to the recent demand for downsizing. However, there is a limit in reducing the size of the damper portion 2a and the clutch disk 2b. In recent clutch devices, the outer diameter of the damper portion 2a (the outer diameter of the clutch plate 22) and the friction facing 1
The clearances between the inner diameters 11 and 112 are set very small (see FIG. 6). For this reason, the damper part 2a
In the vicinity of the connection between the clutch disk 2b and
The space SA on the flywheel 90 side of the clutch disc assembly 2 and the space SB on the pressure plate 32 side are:
In FIG. 6, the communication is performed only in a small area indicated by hatching, and the state is almost divided.

On the other hand, in the damper portion 2a, window holes are provided in the flange portions of the clutch plate 22, the retaining plate 23 and the spline hub 21, and a torsion spring 24 is accommodated in these window holes. Therefore, the flow of air between the space SA and the space SB is limited to an extremely small amount. As described above, in the recent clutch device, the air flow between the spaces SA and SB on both sides of the clutch disk assembly 2 is poor. The applicant has found that this event is one of the causes of the clutch disengagement failure. In particular, when the flywheel 90 is provided with a hole 90b for discharging the wear powder shown in FIG. 5, the pressure in the space SA becomes smaller than that in the space SB, and the clutch disc 2b is attracted to the flywheel 90 side. Flywheel 90
And found that the risk of contact with them increased. The unintended contact between the clutch disc 2b and the flywheel 90 causes a disconnection failure of the clutch.

[0008] It is an object of the present invention to suppress occurrence of clutch disconnection failure in a clutch device having a clutch disk assembly.

[0009]

According to a first aspect of the present invention, there is provided a clutch disk assembly for switching transmission and interruption of torque between a torque input side flywheel and an input shaft of a torque output side transmission. The clutch is pressed against the flywheel by a pressing member of the clutch device, frictionally engages with the flywheel, and connects the flywheel to the input shaft of the transmission. This clutch disk assembly includes an inner peripheral structure and a clutch disk. The inner peripheral structure is interlocked with the input shaft of the transmission in the direction of rotation. The clutch disk is disposed outside the inner peripheral structure, and has a friction engagement portion sandwiched between the flywheel and the pressing member. The inner peripheral portion of the clutch disk is fixed to the inner peripheral structure. The friction engagement portion of the clutch disc is provided with an opening for communicating the space on the flywheel side with the space on the pressing member side.

In the clutch disk assembly according to the present invention, when the friction engagement portion of the clutch disk is sandwiched between the flywheel and the pressing member, torque from the flywheel is transmitted to the clutch disk, and Power is transmitted from the side structure to the input shaft of the transmission. When the pressing on the flywheel by the pressing member of the clutch device is released, the frictional engagement portion of the clutch disk separates from the flywheel and the pressing member, and the transmission of torque from the flywheel to the transmission is cut off.

In this case, an opening is provided in the frictional engagement portion of the clutch disc to allow the space on the flywheel side to communicate with the space on the pressing member side. For this reason, a hole is formed in the flywheel to discharge abrasion powder generated due to frictional contact between the flywheel and the frictional engagement portion, and the air pressure in the space on the flywheel side of the clutch disc assembly is reduced by centrifugal force or the like. Even when the size becomes smaller, the air on the pressing member side of the clutch disc assembly flows into the space on the flywheel side through the opening of the frictional engagement portion, and reduces the pressure difference between the spaces on both sides of the clutch disc assembly. .
As a result, the phenomenon that the clutch disk assembly is attracted to the flywheel due to the pressure difference is suppressed, and the occurrence of clutch disconnection is less likely to occur.

According to a second aspect of the present invention, there is provided a clutch disk assembly according to the first aspect, wherein the opening of the frictional engagement portion of the clutch disk is provided at an inner peripheral portion of the frictional engagement portion. It is missing. The friction engagement part of the clutch disc is
It is arranged between the flywheel and the pressing member. Normally, only a small gap is opened between the friction engagement portion and the flywheel, and between the friction engagement portion and the pressing member. Therefore, if the opening of the frictional engagement portion of the clutch disk is arranged on the outer peripheral side, the air in the space on the pressing member side of the clutch disk assembly must pass through the above-mentioned slight gap, so that the air on the flywheel side of the clutch disk assembly can be used. I can't get to the space. That is, the amount of air communicating between the space on the flywheel side and the space on the pressing member side via the opening is reduced.

In view of this, in the clutch disk assembly according to the present invention, the opening of the friction engagement portion is formed by notching the inner peripheral portion of the friction engagement portion. That is,
A notch is provided in the inner peripheral portion of the friction engagement portion, and the notch is
An opening is provided to allow communication between the space on the flywheel side and the space on the pressing member side. A clutch disk assembly according to a third aspect is the clutch disk assembly according to the first or second aspect, wherein the clutch disk has a core member and a friction member. The inner peripheral portion of the core member is fixed to the inner peripheral structure. The friction member is mounted on the surface on the flywheel side and the surface on the pressing member side of the core member. The core member is divided in the circumferential direction, and a plurality of core members are arranged. The friction member has an opening at least in a part of the core member located in the circumferential gap.

Here, a plurality of core members divided in the circumferential direction are fixed to the inner peripheral structure, and are disposed outside the inner peripheral structure. Therefore, between adjacent core members,
There is a predetermined gap. The friction members mounted on both surfaces of the core member have openings in a part of the portion corresponding to the gap between the core members. For this reason, in the clutch disk, the opening of the friction member and the gap between the core members penetrate in the axial direction of the clutch device. Thereby, the space on the flywheel side of the clutch disc communicates with the space on the pressing member side.

According to a fourth aspect of the present invention, there is provided a clutch disk assembly for switching transmission and cutoff of torque between a torque input side flywheel and a torque output side transmission input shaft. It has a three-dimensional structure and a clutch cover assembly. The clutch disk assembly is one according to any one of claims 1 to 3. The clutch cover assembly has a pressing member, a biasing member, and a clutch cover. The pressing member faces the flywheel with the clutch disc interposed therebetween. The urging member urges the pressing member toward the flywheel. The clutch cover supports the pressing member and the urging member, and is fixed to the flywheel.

[0016]

1 and 2 show a clutch device 1 including a clutch disk assembly 2 according to one embodiment of the present invention. The clutch device 1 is a device for transmitting and interrupting torque from a flywheel 90 on the engine side to an input shaft (not shown) of a transmission. The axis OO in FIG. 1 is the rotation axis of the clutch device 1. This rotation axis OO is a flywheel 90
Are orthogonal to the friction engagement surface 90a.

The flywheel 90 has holes 9 for discharging abrasion powder generated by frictional contact between the flywheel 90 and friction facings 11 and 12 (described later).
0b is formed. <Configuration of Clutch Device> The clutch device 1 mainly includes
It comprises a clutch disc assembly 2 and a clutch cover assembly 3 fixed to the flywheel 90.

The clutch disk assembly 2 includes an inner peripheral damper portion 2a and an outer peripheral clutch disk 2b. The input shaft of the transmission is spline-engaged with the inner peripheral portion of the damper portion 2a. The clutch disk assembly 2 will be described later in detail. The clutch cover assembly 3 is an assembly that presses the clutch disc 2b against the flywheel 90 to frictionally connect or release the connection. This clutch cover assembly 3
Is mainly composed of a clutch cover 31, a pressure plate (pressing member) 32, and a pressure plate moving mechanism 33.

The clutch cover 31 is an annular member, and its outer peripheral portion is fixed to the flywheel 90. As shown in FIG. 1, the pressure plate 32 is arranged such that the friction engagement surface on the flywheel 90 side faces the friction engagement surface 90a of the flywheel 90 with the clutch disc 2b interposed therebetween. This pressure plate 32
Are supported by the clutch cover 31 so as to be relatively non-rotatable and movable in the axial direction.

The pressure plate moving mechanism 33 mainly includes a plurality of coil springs 33a and a release lever 33b. Coil spring 3
3a extends in the direction of the rotation axis OO, one end of which abuts the clutch cover 31, and the other end thereof
It is in contact with 2. In the clutch connection state shown in FIG. 1, the coil spring 33a applies a pressing force to the pressure plate 32 on the flywheel 90 side. The release lever 33b is a member that raises the pressure plate 32 to the side opposite to the flywheel 90 in conjunction with the movement of a clutch operating mechanism (not shown). When a release device (not shown) of the clutch operating mechanism applies a force on the flywheel 90 side to the inner end of the release lever 33b, the pressure plate 32 connected to the outer end of the release lever 33b causes the fly plate to fly. It moves to the side opposite to the wheel 90.

<Detailed Configuration of Clutch Disk Assembly> The details of the clutch disk assembly 2 will be described below. (Damper part) The damper part 2a on the inner peripheral side of the clutch disk assembly 2 is a structure that plays a role of absorbing and attenuating the torque fluctuation.
Clutch plate 22 and retaining plate 23
And a torsion spring 24.

The spline hub 21 has a spline hole 21a at the center thereof which meshes with spline teeth of an input shaft of the transmission. The spline hub 21 is integrally formed with a flange 21b extending outward from a cylindrical main body. A window hole is formed in the flange 21b, and the torsion spring 24 is accommodated in the window hole.

A clutch plate 22 and a retaining plate 23 are arranged so as to sandwich the flange 21b of the spline hub 21. These plates 22, 2
3 are a pair and are non-rotatably connected by pins. In addition, these plates 22 and 23 also have
Window holes 22a and 23a corresponding to the window holes of the flange 21b are formed. These window holes 22a and 23a are cut and raised so as to cover the torsion spring 24 from the outside, and the torsion spring 24 is housed therein.

Both ends of the torsion spring 24 are in contact with both plates 22, 23 and both ends of the window hole of the flange 21b, so that the two plates 22, 23 and the spline hub 21 are in contact with each other.
The torque is transmitted between and. A friction washer 25 is disposed between the inner peripheral portion of the clutch plate 22 and the inner peripheral portion of the flange 21b. Flange 21b
A friction washer 26, a friction plate 27, and a cone spring 28 are arranged between the inner periphery of the retaining plate 23 and the inner periphery of the retaining plate 23.
These friction washers 25, 26 slide between the flange 21 b and the plates 22, 23 to provide a predetermined frictional force (hysteresis torque) for attenuating torque fluctuations (torsional vibration) during expansion and contraction of the torsion spring 24. Occurs.

The outer peripheral portion 22 of the clutch plate 22
b is a portion to which the inner peripheral portion 10a of the core plate 10 of the clutch disc 2b is fixed, and a plurality of holes are formed at equal intervals in the circumferential direction. (Clutch Disk) The clutch disk 2b disposed on the outer peripheral side of the clutch disk assembly 2 mainly includes a core plate (core member) 10 and two types of friction facings 11 and 12.

The core plate 10 includes an inner peripheral portion 10a and a mounting portion 10b located outside the inner peripheral portion 10a. The inner peripheral portion 10a is a portion that overlaps with the outer peripheral portion 22b of the clutch plate 22.
b is fixed with rivets. The mounting portion 10b is a portion where the friction facings 11 and 12 are mounted on both surfaces thereof.

A plurality of core plates 10 are arranged at equal intervals in the circumferential direction. Therefore, there is a gap S between adjacent core plates 10 as shown in FIG. Inner peripheral portion 10a of core plate 10 and mounting portion 1
Since the boundary with 0b is constricted, the circumferential dimension of the gap S in this portion is large. The friction facings 11 and 12 are mounted on both sides of the mounting portion 10b of the core plate 10 by rivets or an adhesive. For one core plate 10, two friction facings 11 and 12 are provided on each side.
Is attached. The mounting portion 10b on which the friction facings 11 and 12 are mounted becomes a friction engagement portion together with the friction facings 11 and 12, and is a target to be sandwiched between the flywheel 90 and the pressure plate 32.

As shown in FIG. 3, the inner peripheral ends of the friction facings 11 and 12 do not draw an arc, and the friction facings 11 and 12 have a shape in which the inner peripheral portions are cut out. That is, the friction facings 11 and 12
Compared to the external shape of the conventional friction facing shown by the dotted line in FIG. 3, it has a shape in which notches 11a and 12a are provided in the inner peripheral portion.

As shown in FIG. 4, the notches 11a and 12a of the friction facings 11 and 12 correspond to the circumferential dimensions of the gap S when the friction facings 11 and 12 are mounted on the core plate 10. Coincides with the large inner circumference. Therefore, the clutch disc 2b composed of the friction facings 11, 12 and the core plate 10 has an opening 2c which is an overlapping portion of the gap S and the notches 11a, 12a (the hatched portions in FIGS. reference).

The opening 2 of the clutch disk 2b
As can be seen by comparing FIGS. 4 and 5, c has a much larger area than the communication portion (opening) indicated by hatching in FIG. 5, and the flywheel of the clutch disk assembly 2 shown in FIG. The air flow between the space SA on the wheel 90 side and the space SB on the pressure plate 32 side is improved.

<Operation of Clutch Device> Next, the operation of the clutch device 1 will be described. First, the operation of releasing the clutch connection from the clutch connection state will be described.
When the release device (not shown) of the clutch operation mechanism pushes the release lever 33 b toward the flywheel 90 according to the clutch operation, the pressure plate 32 moves to the side opposite to the flywheel 90. Then, the clutch connection state is released, and the clutch disk 2b of the clutch disk assembly 2 shifts to a state in which it is separated from the flywheel 90 and the pressure plate 32 (a state shown in FIG. 1). Thus, the torque transmitted from the flywheel 90 to the input shaft of the transmission via the clutch disk 2b and the damper portion 2a is interrupted at a portion transmitted from the flywheel 90 to the clutch disk 2b.

Next, the operation of connecting the clutch from the state in which the clutch is released will be described. When the release device (not shown) of the clutch operation mechanism returns the release lever 33b to the side opposite to the flywheel 90 according to the clutch operation, the pressure plate 32 is pressed toward the flywheel 90. Accordingly, the clutch disc 2b is gradually held between the flywheel 90 and the pressure plate 32, and the torque from the flywheel 90 is applied to the transmission input shaft via the clutch disc 2b and the damper portion 2a. Be transmitted.

<Features of Clutch Disk Assembly of this Embodiment> (1) In the clutch disk assembly 2 of this embodiment, the mounting portion 10b of the core plate 10 and the friction facing 1
An opening 2c is formed in the inner peripheral portion of the frictional engagement portion composed of the first and second portions 12 to allow the space SA on the flywheel 90 side to communicate with the space SB on the pressure plate 32 side. For this reason, even when the air pressure in the space SA decreases due to the air escaping from the hole 90b formed in the flywheel 90 for discharging the abrasion powder due to the centrifugal force during rotation, the space through the opening 2c can be reduced. The air in the SB flows into the space SA, and the pressure difference between the two spaces SA and SB decreases (see the white arrow in FIG. 1). This suppresses the phenomenon that the clutch disk assembly 2 is attracted to the flywheel 90 due to a pressure difference, and the occurrence of clutch disconnection is less likely to occur.

(2) In the clutch disk assembly 2 of the present embodiment, the openings 2c are formed by forming the notches 11a and 12a in the inner peripheral portions of the friction facings 11 and 12.
Are provided on the inner peripheral portion of the frictional engagement portion composed of the mounting portion 10 b of the core plate 10 and the friction facings 11 and 12. Therefore, the flow of air between the space SA and the space SB is improved as compared with the case where an opening is provided in the outer peripheral portion of the clutch disk 2b. That is, when an opening is provided in the outer peripheral portion of the clutch disk 2b, the space SB
The air flowing from the space into the space SA is friction facing 11,
The space SA cannot be reached without passing through a narrow gap between the pressure plate 32 and the pressure plate 32 and a narrow gap between the friction facings 11 and 12 and the flywheel 90.
When the opening 2c is provided in the inner peripheral portion as shown in FIGS. 2 and 4, it is possible to reach the space SA without passing through the narrow gap.

[0035]

According to the present invention, since the opening for communicating the space on the flywheel side with the space on the pressing member side is provided in the frictional engagement portion of the clutch disk, the hole for discharging abrasion powder has a flywheel. Even if the air pressure in the space on the flywheel side of the clutch disk assembly is reduced due to centrifugal force or the like, the air on the pressing member side of the clutch disk assembly can fly through the opening of the friction engagement portion. It flows into the space on the wheel side and reduces the pressure difference between the spaces on both sides of the clutch disc assembly. As a result, the phenomenon that the clutch disk assembly is attracted to the flywheel due to the pressure difference is suppressed, and the occurrence of clutch disconnection is less likely to occur.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a clutch device including a clutch disk assembly according to one embodiment of the present invention.

FIG. 2 is a plan view of a clutch disk assembly.

FIG. 3 is a plan view of a friction facing and a core plate.

FIG. 4 is an enlarged view of an opening of the clutch disk assembly.

FIG. 5 is a longitudinal sectional view of a conventional clutch device.

FIG. 6 is an enlarged view of a connection portion between a damper portion and a clutch disk of a conventional clutch disk assembly.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Clutch device 2 Clutch disk assembly 2a Damper part (inner side structure) 2b Clutch disk 2c Opening 3 Clutch cover assembly 10 Core plate (core member) 11, 12 Friction facing (friction member) 11a, 12a Notch ( Opening) 31 Clutch cover 32 Pressure plate (pressing member) 33a Coil spring (biasing member) S Gap between adjacent core plates SA Space on clutch wheel assembly on flywheel side SB Space on clutch disk assembly on pressure plate side

Claims (4)

[Claims] 1. A clutch device for switching transmission and cutoff of torque between a torque input side flywheel and a torque output side transmission input shaft, wherein said flywheel is pressed against said flywheel by a pressing member of a clutch device. A clutch disc assembly that frictionally engages with a wheel and connects the flywheel and an input shaft of the transmission, wherein an inner peripheral structure interlocked with a rotational direction of the input shaft of the transmission; It is arranged outside the structure, has a friction engagement portion sandwiched between the flywheel and the pressing member,
A clutch disc having an inner peripheral portion fixed to the inner peripheral side structure, wherein the frictional engagement portion is provided with an opening communicating the space on the flywheel side and the space on the pressing member side. The clutch disc assembly. 2. The clutch disk assembly according to claim 1, wherein said opening is a notch provided in an inner peripheral portion of said friction engagement portion. 3. The clutch disk, wherein a core member having an inner peripheral portion fixed to the inner peripheral structure, and friction mounted on the flywheel side surface and the pressing member side surface of the core member. The core member is divided in the circumferential direction, and a plurality of the core members are arranged, and the friction member is at least a portion of the core member located in the circumferential gap. 3. The clutch disc assembly according to claim 1, wherein an opening is provided in a part. 4. A clutch device according to claim 1, wherein said clutch device switches transmission and cutoff of torque between a flywheel on a torque input side and an input shaft of a transmission on a torque output side. An assembly, a pressing member opposed to the flywheel with the clutch disk interposed therebetween, an urging member for urging the pressing member toward the flywheel, and a fly supporting the urging member and the urging member. A clutch cover assembly having a clutch cover fixed to the wheel.